haproxy.c

/*
 * HA-Proxy : High Availability-enabled HTTP/TCP proxy
 * 2000-2006 - Willy Tarreau - willy AT meta-x DOT org.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version
 * 2 of the License, or (at your option) any later version.
 *
 * Please refer to RFC2068 or RFC2616 for informations about HTTP protocol, and
 * RFC2965 for informations about cookies usage. More generally, the IETF HTTP
 * Working Group's web site should be consulted for protocol related changes :
 *
 *     http://ftp.ics.uci.edu/pub/ietf/http/
 *
 * Pending bugs (may be not fixed because never reproduced) :
 *   - solaris only : sometimes, an HTTP proxy with only a dispatch address causes
 *     the proxy to terminate (no core) if the client breaks the connection during
 *     the response. Seen on 1.1.8pre4, but never reproduced. May not be related to
 *     the snprintf() bug since requests were simple (GET / HTTP/1.0), but may be
 *     related to missing setsid() (fixed in 1.1.15)
 *   - a proxy with an invalid config will prevent the startup even if disabled.
 *
 * ChangeLog has moved to the CHANGELOG file.
 *
 * TODO:
 *   - handle properly intermediate incomplete server headers. Done ?
 *   - handle hot-reconfiguration
 *   - fix client/server state transition when server is in connect or headers state
 *     and client suddenly disconnects. The server *should* switch to SHUT_WR, but
 *     still handle HTTP headers.
 *   - remove MAX_NEWHDR
 *   - cut this huge file into several ones
 *
 */

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <ctype.h>
#include <sys/time.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/tcp.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <netdb.h>
#include <fcntl.h>
#include <errno.h>
#include <signal.h>
#include <stdarg.h>
#include <sys/resource.h>
#include <time.h>
#include <syslog.h>

#ifdef USE_PCRE
#include <pcre.h>
#include <pcreposix.h>
#else
#include <regex.h>
#endif

#if defined(TPROXY) && defined(NETFILTER)
#include <linux/netfilter_ipv4.h>
#endif

#if defined(__dietlibc__)
#include <strings.h>
#endif

#if defined(ENABLE_POLL)
#include <sys/poll.h>
#endif

#if defined(ENABLE_EPOLL)
#if !defined(USE_MY_EPOLL)
#include <sys/epoll.h>
#else
#include "include/epoll.h"
#endif
#endif

#ifdef DEBUG_FULL
#include <assert.h>
#endif

#include "include/appsession.h"
#include "include/mini-clist.h"

#ifndef HAPROXY_VERSION
#define HAPROXY_VERSION "1.2.12"
#endif

#ifndef HAPROXY_DATE
#define HAPROXY_DATE	"2006/04/15"
#endif

/* this is for libc5 for example */
#ifndef TCP_NODELAY
#define TCP_NODELAY	1
#endif

#ifndef SHUT_RD
#define SHUT_RD		0
#endif

#ifndef SHUT_WR
#define SHUT_WR		1
#endif

/*
 * BUFSIZE defines the size of a read and write buffer. It is the maximum
 * amount of bytes which can be stored by the proxy for each session. However,
 * when reading HTTP headers, the proxy needs some spare space to add or rewrite
 * headers if needed. The size of this spare is defined with MAXREWRITE. So it
 * is not possible to process headers longer than BUFSIZE-MAXREWRITE bytes. By
 * default, BUFSIZE=16384 bytes and MAXREWRITE=BUFSIZE/2, so the maximum length
 * of headers accepted is 8192 bytes, which is in line with Apache's limits.
 */
#ifndef BUFSIZE
#define BUFSIZE		16384
#endif

// reserved buffer space for header rewriting
#ifndef MAXREWRITE
#define MAXREWRITE	(BUFSIZE / 2)
#endif

#define REQURI_LEN	1024
#define CAPTURE_LEN	64

// max # args on a configuration line
#define MAX_LINE_ARGS	40

// max # of added headers per request
#define MAX_NEWHDR	10

// max # of matches per regexp
#define	MAX_MATCH	10

// cookie delimitor in "prefix" mode. This character is inserted between the
// persistence cookie and the original value. The '~' is allowed by RFC2965,
// and should not be too common in server names.
#ifndef COOKIE_DELIM
#define COOKIE_DELIM	'~'
#endif

#define CONN_RETRIES	3

#define	CHK_CONNTIME	2000
#define	DEF_CHKINTR	2000
#define DEF_FALLTIME	3
#define DEF_RISETIME	2
#define DEF_CHECK_REQ	"OPTIONS / HTTP/1.0\r\n\r\n"

/* Default connections limit.
 *
 * A system limit can be enforced at build time in order to avoid using haproxy
 * beyond reasonable system limits. For this, just define SYSTEM_MAXCONN to the
 * absolute limit accepted by the system. If the configuration specifies a
 * higher value, it will be capped to SYSTEM_MAXCONN and a warning will be
 * emitted. The only way to override this limit will be to set it via the
 * command-line '-n' argument.
 */
#ifndef SYSTEM_MAXCONN
#define DEFAULT_MAXCONN	2000
#else
#define DEFAULT_MAXCONN	SYSTEM_MAXCONN
#endif

/* how many bits are needed to code the size of an int (eg: 32bits -> 5) */
#define	INTBITS		5

/* show stats this every millisecond, 0 to disable */
#ifndef STATTIME
#define STATTIME	2000
#endif

/* this reduces the number of calls to select() by choosing appropriate
 * sheduler precision in milliseconds. It should be near the minimum
 * time that is needed by select() to collect all events. All timeouts
 * are rounded up by adding this value prior to pass it to select().
 */
#define SCHEDULER_RESOLUTION	9

#define TIME_ETERNITY		-1
/* returns the lowest delay amongst <old> and <new>, and respects TIME_ETERNITY */
#define MINTIME(old, new)	(((new)<0)?(old):(((old)<0||(new)<(old))?(new):(old)))
#define SETNOW(a)		(*a=now)

/****** string-specific macros and functions ******/
/* if a > max, then bound <a> to <max>. The macro returns the new <a> */
#define UBOUND(a, max)	({ typeof(a) b = (max); if ((a) > b) (a) = b; (a); })

/* if a < min, then bound <a> to <min>. The macro returns the new <a> */
#define LBOUND(a, min)	({ typeof(a) b = (min); if ((a) < b) (a) = b; (a); })

/* returns 1 only if only zero or one bit is set in X, which means that X is a
 * power of 2, and 0 otherwise */
#define POWEROF2(x) (((x) & ((x)-1)) == 0)
/*
 * copies at most <size-1> chars from <src> to <dst>. Last char is always
 * set to 0, unless <size> is 0. The number of chars copied is returned
 * (excluding the terminating zero).
 * This code has been optimized for size and speed : on x86, it's 45 bytes
 * long, uses only registers, and consumes only 4 cycles per char.
 */
int strlcpy2(char *dst, const char *src, int size) {
    char *orig = dst;
    if (size) {
	while (--size && (*dst = *src)) {
	    src++; dst++;
	}
	*dst = 0;
    }
    return dst - orig;
}

/*
 * Returns a pointer to an area of <__len> bytes taken from the pool <pool> or
 * dynamically allocated. In the first case, <__pool> is updated to point to
 * the next element in the list.
 */
#define pool_alloc_from(__pool, __len) ({                                      \
    void *__p;                                                                 \
    if ((__p = (__pool)) == NULL)                                              \
	__p = malloc(((__len) >= sizeof (void *)) ? (__len) : sizeof(void *)); \
    else {                                                                     \
	__pool = *(void **)(__pool);                                           \
    }                                                                          \
    __p;                                                                       \
})

/*
 * Puts a memory area back to the corresponding pool.
 * Items are chained directly through a pointer that
 * is written in the beginning of the memory area, so
 * there's no need for any carrier cell. This implies
 * that each memory area is at least as big as one
 * pointer.
 */
#define pool_free_to(__pool, __ptr) ({          \
    *(void **)(__ptr) = (void *)(__pool);       \
    __pool = (void *)(__ptr);                   \
})


#define MEM_OPTIM
#ifdef	MEM_OPTIM
/*
 * Returns a pointer to type <type> taken from the
 * pool <pool_type> or dynamically allocated. In the
 * first case, <pool_type> is updated to point to the
 * next element in the list.
 */
#define pool_alloc(type) ({			\
    void *__p;					\
    if ((__p = pool_##type) == NULL)		\
	__p = malloc(sizeof_##type);		\
    else {					\
	pool_##type = *(void **)pool_##type;	\
    }						\
    __p;					\
})

/*
 * Puts a memory area back to the corresponding pool.
 * Items are chained directly through a pointer that
 * is written in the beginning of the memory area, so
 * there's no need for any carrier cell. This implies
 * that each memory area is at least as big as one
 * pointer.
 */
#define pool_free(type, ptr) ({				\
    *(void **)ptr = (void *)pool_##type;		\
    pool_##type = (void *)ptr;				\
})

#else
#define pool_alloc(type) (calloc(1,sizeof_##type));
#define pool_free(type, ptr) (free(ptr));
#endif	/* MEM_OPTIM */

#define sizeof_task	sizeof(struct task)
#define sizeof_session	sizeof(struct session)
#define sizeof_pendconn	sizeof(struct pendconn)
#define sizeof_buffer	sizeof(struct buffer)
#define sizeof_fdtab	sizeof(struct fdtab)
#define sizeof_requri	REQURI_LEN
#define sizeof_capture	CAPTURE_LEN
#define sizeof_curappsession	CAPTURE_LEN	/* current_session pool */
#define sizeof_appsess	sizeof(struct appsessions)

/* different possible states for the sockets */
#define FD_STCLOSE	0
#define FD_STLISTEN	1
#define FD_STCONN	2
#define FD_STREADY	3
#define FD_STERROR	4

/* values for task->state */
#define TASK_IDLE	0
#define TASK_RUNNING	1

/* values for proxy->state */
#define PR_STNEW	0
#define PR_STIDLE	1
#define PR_STRUN	2
#define PR_STSTOPPED	3
#define PR_STPAUSED	4

/* values for proxy->mode */
#define PR_MODE_TCP	0
#define PR_MODE_HTTP	1
#define PR_MODE_HEALTH	2

/* possible actions for the *poll() loops */
#define POLL_LOOP_ACTION_INIT	0
#define POLL_LOOP_ACTION_RUN	1
#define POLL_LOOP_ACTION_CLEAN	2

/* poll mechanisms available */
#define POLL_USE_SELECT         (1<<0)
#define POLL_USE_POLL           (1<<1)
#define POLL_USE_EPOLL          (1<<2)

/* bits for proxy->options */
#define PR_O_REDISP	0x00000001	/* allow reconnection to dispatch in case of errors */
#define PR_O_TRANSP	0x00000002	/* transparent mode : use original DEST as dispatch */
#define PR_O_COOK_RW	0x00000004	/* rewrite all direct cookies with the right serverid */
#define PR_O_COOK_IND	0x00000008	/* keep only indirect cookies */
#define PR_O_COOK_INS	0x00000010	/* insert cookies when not accessing a server directly */
#define PR_O_COOK_PFX	0x00000020	/* rewrite all cookies by prefixing the right serverid */
#define PR_O_COOK_ANY	(PR_O_COOK_RW | PR_O_COOK_IND | PR_O_COOK_INS | PR_O_COOK_PFX)
#define PR_O_BALANCE_RR	0x00000040	/* balance in round-robin mode */
#define	PR_O_KEEPALIVE	0x00000080	/* follow keep-alive sessions */
#define	PR_O_FWDFOR	0x00000100	/* insert x-forwarded-for with client address */
#define	PR_O_BIND_SRC	0x00000200	/* bind to a specific source address when connect()ing */
#define PR_O_NULLNOLOG	0x00000400	/* a connect without request will not be logged */
#define PR_O_COOK_NOC	0x00000800	/* add a 'Cache-control' header with the cookie */
#define PR_O_COOK_POST	0x00001000	/* don't insert cookies for requests other than a POST */
#define PR_O_HTTP_CHK	0x00002000	/* use HTTP 'OPTIONS' method to check server health */
#define PR_O_PERSIST	0x00004000	/* server persistence stays effective even when server is down */
#define PR_O_LOGASAP	0x00008000	/* log as soon as possible, without waiting for the session to complete */
#define PR_O_HTTP_CLOSE	0x00010000	/* force 'connection: close' in both directions */
#define PR_O_CHK_CACHE	0x00020000	/* require examination of cacheability of the 'set-cookie' field */
#define PR_O_TCP_CLI_KA	0x00040000	/* enable TCP keep-alive on client-side sessions */
#define PR_O_TCP_SRV_KA	0x00080000	/* enable TCP keep-alive on server-side sessions */
#define PR_O_USE_ALL_BK	0x00100000	/* load-balance between backup servers */
#define PR_O_FORCE_CLO	0x00200000	/* enforce the connection close immediately after server response */
#define PR_O_BALANCE_SH	0x00400000	/* balance on source IP hash */
#define PR_O_BALANCE	(PR_O_BALANCE_RR | PR_O_BALANCE_SH)

/* various session flags, bits values 0x01 to 0x20 (shift 0) */
#define SN_DIRECT	0x00000001	/* connection made on the server matching the client cookie */
#define SN_CLDENY	0x00000002	/* a client header matches a deny regex */
#define SN_CLALLOW	0x00000004	/* a client header matches an allow regex */
#define SN_SVDENY	0x00000008	/* a server header matches a deny regex */
#define SN_SVALLOW	0x00000010	/* a server header matches an allow regex */
#define	SN_POST		0x00000020	/* the request was an HTTP POST */

/* session flags dedicated to cookies : bits values 0x40, 0x80 (0-3 shift 6) */
#define	SN_CK_NONE	0x00000000	/* this session had no cookie */
#define	SN_CK_INVALID	0x00000040	/* this session had a cookie which matches no server */
#define	SN_CK_DOWN	0x00000080	/* this session had cookie matching a down server */
#define	SN_CK_VALID	0x000000C0	/* this session had cookie matching a valid server */
#define	SN_CK_MASK	0x000000C0	/* mask to get this session's cookie flags */
#define SN_CK_SHIFT	6		/* bit shift */

/* session termination conditions, bits values 0x100 to 0x700 (0-7 shift 8) */
#define SN_ERR_NONE     0x00000000
#define SN_ERR_CLITO	0x00000100	/* client time-out */
#define SN_ERR_CLICL	0x00000200	/* client closed (read/write error) */
#define SN_ERR_SRVTO	0x00000300	/* server time-out, connect time-out */
#define SN_ERR_SRVCL	0x00000400	/* server closed (connect/read/write error) */
#define SN_ERR_PRXCOND	0x00000500	/* the proxy decided to close (deny...) */
#define SN_ERR_RESOURCE	0x00000600	/* the proxy encountered a lack of a local resources (fd, mem, ...) */
#define SN_ERR_INTERNAL	0x00000700	/* the proxy encountered an internal error */
#define SN_ERR_MASK	0x00000700	/* mask to get only session error flags */
#define SN_ERR_SHIFT	8		/* bit shift */

/* session state at termination, bits values 0x1000 to 0x7000 (0-7 shift 12) */
#define SN_FINST_R	0x00001000	/* session ended during client request */
#define SN_FINST_C	0x00002000	/* session ended during server connect */
#define SN_FINST_H	0x00003000	/* session ended during server headers */
#define SN_FINST_D	0x00004000	/* session ended during data phase */
#define SN_FINST_L	0x00005000	/* session ended while pushing last data to client */
#define SN_FINST_MASK	0x00007000	/* mask to get only final session state flags */
#define	SN_FINST_SHIFT	12		/* bit shift */

/* cookie information, bits values 0x10000 to 0x80000 (0-8 shift 16) */
#define	SN_SCK_NONE	0x00000000	/* no set-cookie seen for the server cookie */
#define	SN_SCK_DELETED	0x00010000	/* existing set-cookie deleted or changed */
#define	SN_SCK_INSERTED	0x00020000	/* new set-cookie inserted or changed existing one */
#define	SN_SCK_SEEN	0x00040000	/* set-cookie seen for the server cookie */
#define	SN_SCK_MASK	0x00070000	/* mask to get the set-cookie field */
#define	SN_SCK_ANY	0x00080000	/* at least one set-cookie seen (not to be counted) */
#define	SN_SCK_SHIFT	16		/* bit shift */

/* cacheability management, bits values 0x100000 to 0x300000 (0-3 shift 20) */
#define	SN_CACHEABLE	0x00100000	/* at least part of the response is cacheable */
#define	SN_CACHE_COOK	0x00200000	/* a cookie in the response is cacheable */
#define	SN_CACHE_SHIFT	20		/* bit shift */

/* various other session flags, bits values 0x400000 and above */
#define SN_MONITOR	0x00400000	/* this session comes from a monitoring system */
#define SN_ASSIGNED	0x00800000	/* no need to assign a server to this session */
#define SN_ADDR_SET	0x01000000	/* this session's server address has been set */


/* different possible states for the client side */
#define CL_STHEADERS	0
#define CL_STDATA	1
#define CL_STSHUTR	2
#define CL_STSHUTW	3
#define CL_STCLOSE	4

/* different possible states for the server side */
#define SV_STIDLE	0
#define SV_STCPEND	1
#define SV_STCONN	2
#define SV_STHEADERS	3
#define SV_STDATA	4
#define SV_STSHUTR	5
#define SV_STSHUTW	6
#define SV_STCLOSE	7

/* result of an I/O event */
#define	RES_SILENT	0	/* didn't happen */
#define RES_DATA	1	/* data were sent or received */
#define	RES_NULL	2	/* result is 0 (read == 0), or connect without need for writing */
#define RES_ERROR	3	/* result -1 or error on the socket (eg: connect()) */

/* modes of operation (global.mode) */
#define	MODE_DEBUG	1
#define	MODE_STATS	2
#define	MODE_LOG	4
#define	MODE_DAEMON	8
#define	MODE_QUIET	16
#define	MODE_CHECK	32
#define	MODE_VERBOSE	64
#define	MODE_STARTING	128
#define	MODE_FOREGROUND	256

/* server flags */
#define SRV_RUNNING	1	/* the server is UP */
#define SRV_BACKUP	2	/* this server is a backup server */
#define	SRV_MAPPORTS	4	/* this server uses mapped ports */
#define	SRV_BIND_SRC	8	/* this server uses a specific source address */
#define	SRV_CHECKED	16	/* this server needs to be checked */

/* function which act on servers need to return various errors */
#define SRV_STATUS_OK       0   /* everything is OK. */
#define SRV_STATUS_INTERNAL 1   /* other unrecoverable errors. */
#define SRV_STATUS_NOSRV    2   /* no server is available */
#define SRV_STATUS_FULL     3   /* the/all server(s) are saturated */
#define SRV_STATUS_QUEUED   4   /* the/all server(s) are saturated but the connection was queued */

/* what to do when a header matches a regex */
#define ACT_ALLOW	0	/* allow the request */
#define ACT_REPLACE	1	/* replace the matching header */
#define ACT_REMOVE	2	/* remove the matching header */
#define ACT_DENY	3	/* deny the request */
#define ACT_PASS	4	/* pass this header without allowing or denying the request */

/* configuration sections */
#define CFG_NONE	0
#define CFG_GLOBAL	1
#define CFG_LISTEN	2

/* fields that need to be logged. They appear as flags in session->logs.logwait */
#define LW_DATE		1	/* date */
#define LW_CLIP		2	/* CLient IP */
#define LW_SVIP		4	/* SerVer IP */
#define LW_SVID		8	/* server ID */
#define	LW_REQ		16	/* http REQuest */
#define LW_RESP		32	/* http RESPonse */
#define LW_PXIP		64	/* proxy IP */
#define LW_PXID		128	/* proxy ID */
#define LW_BYTES	256	/* bytes read from server */
#define LW_COOKIE	512	/* captured cookie */
#define LW_REQHDR	1024	/* request header(s) */
#define LW_RSPHDR	2048	/* response header(s) */

#define ERR_NONE	0	/* no error */
#define ERR_RETRYABLE	1	/* retryable error, may be cumulated */
#define ERR_FATAL	2	/* fatal error, may be cumulated */

/*********************************************************************/

#define LIST_HEAD(a)	((void *)(&(a)))

/*********************************************************************/

struct cap_hdr {
    struct cap_hdr *next;
    char *name;				/* header name, case insensitive */
    int namelen;			/* length of the header name, to speed-up lookups */
    int len;				/* capture length, not including terminal zero */
    int index;				/* index in the output array */
    void *pool;				/* pool of pre-allocated memory area of (len+1) bytes */
};

struct hdr_exp {
    struct hdr_exp *next;
    regex_t *preg;			/* expression to look for */
    int action;				/* ACT_ALLOW, ACT_REPLACE, ACT_REMOVE, ACT_DENY */
    char *replace;			/* expression to set instead */
};

struct buffer {
    unsigned int l;			/* data length */
    char *r, *w, *h, *lr;     		/* read ptr, write ptr, last header ptr, last read */
    char *rlim;				/* read limit, used for header rewriting */
    unsigned long long total;		/* total data read */
    char data[BUFSIZE];
};

struct pendconn {
    struct list list;			/* chaining ... */
    struct session *sess;		/* the session waiting for a connection */
    struct server *srv;			/* the server we are waiting for */
};

struct server {
    struct server *next;
    int state;				/* server state (SRV_*) */
    int  cklen;				/* the len of the cookie, to speed up checks */
    char *cookie;			/* the id set in the cookie */
    char *id;				/* just for identification */
    struct list pendconns;		/* pending connections */
    int nbpend;				/* number of pending connections */
    struct sockaddr_in addr;		/* the address to connect to */
    struct sockaddr_in source_addr;	/* the address to which we want to bind for connect() */
    short check_port;			/* the port to use for the health checks */
    int health;				/* 0->rise-1 = bad; rise->rise+fall-1 = good */
    int rise, fall;			/* time in iterations */
    int inter;				/* time in milliseconds */
    int result;				/* 0 = connect OK, -1 = connect KO */
    int curfd;				/* file desc used for current test, or -1 if not in test */
    unsigned char uweight, eweight;	/* user-specified weight-1, and effective weight-1 */
    unsigned int wscore;		/* weight score, used during srv map computation */
    int cur_sess;			/* number of currently active sessions (including syn_sent) */
    unsigned int cum_sess;		/* cumulated number of sessions really sent to this server */
    unsigned int maxconn;		/* max # of active sessions. 0 = unlimited. */
    struct proxy *proxy;		/* the proxy this server belongs to */
};

/* The base for all tasks */
struct task {
    struct task *next, *prev;		/* chaining ... */
    struct task *rqnext;		/* chaining in run queue ... */
    struct task *wq;			/* the wait queue this task is in */
    int state;				/* task state : IDLE or RUNNING */
    struct timeval expire;		/* next expiration time for this task, use only for fast sorting */
    int (*process)(struct task *t);	/* the function which processes the task */
    void *context;			/* the task's context */
};

/* WARNING: if new fields are added, they must be initialized in event_accept() */
struct session {
    struct task *task;			/* the task associated with this session */
    /* application specific below */
    struct timeval crexpire;		/* expiration date for a client read  */
    struct timeval cwexpire;		/* expiration date for a client write */
    struct timeval srexpire;		/* expiration date for a server read  */
    struct timeval swexpire;		/* expiration date for a server write */
    struct timeval cnexpire;		/* expiration date for a connect */
    char res_cr, res_cw, res_sr, res_sw;/* results of some events */
    struct proxy *proxy;		/* the proxy this socket belongs to */
    int cli_fd;				/* the client side fd */
    int srv_fd;				/* the server side fd */
    int cli_state;			/* state of the client side */
    int srv_state;			/* state of the server side */
    int conn_retries;			/* number of connect retries left */
    int flags;				/* some flags describing the session */
    struct buffer *req;			/* request buffer */
    struct buffer *rep;			/* response buffer */
    struct sockaddr_storage cli_addr;	/* the client address */
    struct sockaddr_in srv_addr;	/* the address to connect to */
    struct server *srv;			/* the server being used */
    struct pendconn *pend_pos;		/* if not NULL, points to the position in the pending queue */
    char **req_cap;			/* array of captured request headers (may be NULL) */
    char **rsp_cap;			/* array of captured response headers (may be NULL) */
    struct {
	int logwait;			/* log fields waiting to be collected : LW_* */
	struct timeval tv_accept;	/* date of the accept() (beginning of the session) */
	long  t_request;		/* delay before the end of the request arrives, -1 if never occurs */
	long  t_queue;			/* delay before the session gets out of the connect queue, -1 if never occurs */
	long  t_connect;		/* delay before the connect() to the server succeeds, -1 if never occurs */
	long  t_data;			/* delay before the first data byte from the server ... */
	unsigned long  t_close;		/* total session duration */
	unsigned long queue_size;	/* overall number of sessions waiting for a connect slot on this instance at accept() time */
	char *uri;			/* first line if log needed, NULL otherwise */
	char *cli_cookie;		/* cookie presented by the client, in capture mode */
	char *srv_cookie;		/* cookie presented by the server, in capture mode */
	int status;			/* HTTP status from the server, negative if from proxy */
	long long bytes;		/* number of bytes transferred from the server */
    } logs;
    unsigned int uniq_id;		/* unique ID used for the traces */
};

struct listener {
    int fd;				/* the listen socket */
    struct sockaddr_storage addr;	/* the address we listen to */
    struct listener *next;		/* next address or NULL */
};

struct proxy {
    struct listener *listen;		/* the listen addresses and sockets */
    struct in_addr mon_net, mon_mask;	/* don't forward connections from this net (network order) FIXME: should support IPv6 */
    int state;				/* proxy state */
    struct sockaddr_in dispatch_addr;	/* the default address to connect to */
    struct server *srv;			/* known servers */
    int srv_act, srv_bck;		/* # of running servers */
    int tot_wact, tot_wbck;		/* total weights of active and backup servers */
    struct server **srv_map;		/* the server map used to apply weights */
    int srv_map_sz;			/* the size of the effective server map */
    int srv_rr_idx;			/* next server to be elected in round robin mode */
    char *cookie_name;			/* name of the cookie to look for */
    int  cookie_len;			/* strlen(cookie_name), computed only once */
    char *appsession_name;		/* name of the cookie to look for */
    int  appsession_name_len;		/* strlen(appsession_name), computed only once */
    int  appsession_len;		/* length of the appsession cookie value to be used */
    int  appsession_timeout;
    CHTbl htbl_proxy;			/* Per Proxy hashtable */
    char *capture_name;			/* beginning of the name of the cookie to capture */
    int  capture_namelen;		/* length of the cookie name to match */
    int  capture_len;			/* length of the string to be captured */
    int clitimeout;			/* client I/O timeout (in milliseconds) */
    int srvtimeout;			/* server I/O timeout (in milliseconds) */
    int contimeout;			/* connect timeout (in milliseconds) */
    char *id;				/* proxy id */
    struct list pendconns;		/* pending connections with no server assigned yet */
    int nbpend;				/* number of pending connections with no server assigned yet */
    int totpend;			/* total number of pending connections on this instance (for stats) */
    int nbconn;				/* # of active sessions */
    unsigned int cum_conn;		/* cumulated number of processed sessions */
    int maxconn;			/* max # of active sessions */
    int conn_retries;			/* maximum number of connect retries */
    int options;			/* PR_O_REDISP, PR_O_TRANSP, ... */
    int mode;				/* mode = PR_MODE_TCP, PR_MODE_HTTP or PR_MODE_HEALTH */
    struct sockaddr_in source_addr;	/* the address to which we want to bind for connect() */
    struct proxy *next;
    struct sockaddr_in logsrv1, logsrv2; /* 2 syslog servers */
    signed char logfac1, logfac2;	/* log facility for both servers. -1 = disabled */
    int loglev1, loglev2;		/* log level for each server, 7 by default */
    int to_log;				/* things to be logged (LW_*) */
    struct timeval stop_time;		/* date to stop listening, when stopping != 0 */
    int nb_reqadd, nb_rspadd;
    struct hdr_exp *req_exp;		/* regular expressions for request headers */
    struct hdr_exp *rsp_exp;		/* regular expressions for response headers */
    int nb_req_cap, nb_rsp_cap;		/* # of headers to be captured */
    struct cap_hdr *req_cap;		/* chained list of request headers to be captured */
    struct cap_hdr *rsp_cap;		/* chained list of response headers to be captured */
    void *req_cap_pool, *rsp_cap_pool;	/* pools of pre-allocated char ** used to build the sessions */
    char *req_add[MAX_NEWHDR], *rsp_add[MAX_NEWHDR]; /* headers to be added */
    int grace;				/* grace time after stop request */
    char *check_req;			/* HTTP request to use if PR_O_HTTP_CHK is set, else NULL */
    int check_len;			/* Length of the HTTP request */
    struct {
	char *msg400;			/* message for error 400 */
	int len400;			/* message length for error 400 */
	char *msg403;			/* message for error 403 */
	int len403;			/* message length for error 403 */
	char *msg408;			/* message for error 408 */
	int len408;			/* message length for error 408 */
	char *msg500;			/* message for error 500 */
	int len500;			/* message length for error 500 */
	char *msg502;			/* message for error 502 */
	int len502;			/* message length for error 502 */
	char *msg503;			/* message for error 503 */
	int len503;			/* message length for error 503 */
	char *msg504;			/* message for error 504 */
	int len504;			/* message length for error 504 */
    } errmsg;
};

/* info about one given fd */
struct fdtab {
    int (*read)(int fd);	/* read function */
    int (*write)(int fd);	/* write function */
    struct task *owner;		/* the session (or proxy) associated with this fd */
    int state;			/* the state of this fd */
};

/*********************************************************************/

int cfg_maxpconn = DEFAULT_MAXCONN;	/* # of simultaneous connections per proxy (-N) */
int cfg_maxconn = 0;		/* # of simultaneous connections, (-n) */
char *cfg_cfgfile = NULL;	/* configuration file */
char *progname = NULL;		/* program name */
int  pid;			/* current process id */

/* global options */
static struct {
    int uid;
    int gid;
    int nbproc;
    int maxconn;
    int maxsock;		/* max # of sockets */
    int rlimit_nofile;		/* default ulimit-n value : 0=unset */
    int rlimit_memmax;		/* default ulimit-d in megs value : 0=unset */
    int mode;
    char *chroot;
    char *pidfile;
    int logfac1, logfac2;
    int loglev1, loglev2;
    struct sockaddr_in logsrv1, logsrv2;
} global = {
    logfac1 : -1,
    logfac2 : -1,
    loglev1 : 7, /* max syslog level : debug */
    loglev2 : 7,
    /* others NULL OK */
};

/*********************************************************************/

fd_set	*StaticReadEvent,
    	*StaticWriteEvent;

int cfg_polling_mechanism = 0;     /* POLL_USE_{SELECT|POLL|EPOLL} */

void **pool_session = NULL,
    **pool_pendconn = NULL,
    **pool_buffer   = NULL,
    **pool_fdtab    = NULL,
    **pool_requri   = NULL,
    **pool_task	    = NULL,
    **pool_capture  = NULL,
    **pool_appsess  = NULL;

struct proxy *proxy  = NULL;	/* list of all existing proxies */
struct fdtab *fdtab = NULL;	/* array of all the file descriptors */
struct task *rq = NULL;		/* global run queue */
struct task wait_queue[2] = {	/* global wait queue */
    {
	prev:LIST_HEAD(wait_queue[0]),  /* expirable tasks */
	next:LIST_HEAD(wait_queue[0]),
    },
    {
	prev:LIST_HEAD(wait_queue[1]),  /* non-expirable tasks */
	next:LIST_HEAD(wait_queue[1]),
    },
};

static int totalconn = 0;	/* total # of terminated sessions */
static int actconn = 0;		/* # of active sessions */
static int maxfd = 0;		/* # of the highest fd + 1 */
static int listeners = 0;	/* # of listeners */
static int stopping = 0;	/* non zero means stopping in progress */
static struct timeval now = {0,0};	/* the current date at any moment */
static struct proxy defproxy;		/* fake proxy used to assign default values on all instances */

/* Here we store informations about the pids of the processes we may pause
 * or kill. We will send them a signal every 10 ms until we can bind to all
 * our ports. With 200 retries, that's about 2 seconds.
 */
#define MAX_START_RETRIES	200
static int nb_oldpids = 0;
static int *oldpids = NULL;
static int oldpids_sig; /* use USR1 or TERM */

#if defined(ENABLE_EPOLL)
/* FIXME: this is dirty, but at the moment, there's no other solution to remove
 * the old FDs from outside the loop. Perhaps we should export a global 'poll'
 * structure with pointers to functions such as init_fd() and close_fd(), plus
 * a private structure with several pointers to places such as below.
 */

static fd_set *PrevReadEvent = NULL, *PrevWriteEvent = NULL;
#endif

static regmatch_t pmatch[MAX_MATCH];  /* rm_so, rm_eo for regular expressions */
/* this is used to drain data, and as a temporary buffer for sprintf()... */
static char trash[BUFSIZE];

const int zero = 0;
const int one = 1;

/*
 * Syslog facilities and levels. Conforming to RFC3164.
 */

#define MAX_SYSLOG_LEN		1024
#define NB_LOG_FACILITIES	24
const char *log_facilities[NB_LOG_FACILITIES] = {
    "kern", "user", "mail", "daemon",
    "auth", "syslog", "lpr", "news",
    "uucp", "cron", "auth2", "ftp",
    "ntp", "audit", "alert", "cron2",
    "local0", "local1", "local2", "local3",
    "local4", "local5", "local6", "local7"
};


#define NB_LOG_LEVELS	8
const char *log_levels[NB_LOG_LEVELS] = {
    "emerg", "alert", "crit", "err",
    "warning", "notice", "info", "debug"
};

#define SYSLOG_PORT	514

const char *monthname[12] = {"Jan", "Feb", "Mar", "Apr", "May", "Jun",
			     "Jul", "Aug", "Sep", "Oct", "Nov", "Dec" };

const char sess_term_cond[8]  = "-cCsSPRI";	/* normal, CliTo, CliErr, SrvTo, SrvErr, PxErr, Resource, Internal */
const char sess_fin_state[8]  = "-RCHDL67";	/* cliRequest, srvConnect, srvHeader, Data, Last, unknown */
const char sess_cookie[4]     = "NIDV";		/* No cookie, Invalid cookie, cookie for a Down server, Valid cookie */
const char sess_set_cookie[8] = "N1I3PD5R";	/* No set-cookie, unknown, Set-Cookie Inserted, unknown,
					    	   Set-cookie seen and left unchanged (passive), Set-cookie Deleted,
						   unknown, Set-cookie Rewritten */

#define MAX_HOSTNAME_LEN	32
static char hostname[MAX_HOSTNAME_LEN] = "";

const char *HTTP_302 =
	"HTTP/1.0 302 Found\r\n"
	"Cache-Control: no-cache\r\n"
	"Connection: close\r\n"
	"Location: "; /* not terminated since it will be concatenated with the URL */

/* same as 302 except that the browser MUST retry with the GET method */
const char *HTTP_303 =
	"HTTP/1.0 303 See Other\r\n"
	"Cache-Control: no-cache\r\n"
	"Connection: close\r\n"
	"Location: "; /* not terminated since it will be concatenated with the URL */

const char *HTTP_400 =
	"HTTP/1.0 400 Bad request\r\n"
	"Cache-Control: no-cache\r\n"
	"Connection: close\r\n"
	"\r\n"
	"<html><body><h1>400 Bad request</h1>\nYour browser sent an invalid request.\n</body></html>\n";

const char *HTTP_403 =
	"HTTP/1.0 403 Forbidden\r\n"
	"Cache-Control: no-cache\r\n"
	"Connection: close\r\n"
	"\r\n"
	"<html><body><h1>403 Forbidden</h1>\nRequest forbidden by administrative rules.\n</body></html>\n";

const char *HTTP_408 =
	"HTTP/1.0 408 Request Time-out\r\n"
	"Cache-Control: no-cache\r\n"
	"Connection: close\r\n"
	"\r\n"
	"<html><body><h1>408 Request Time-out</h1>\nYour browser didn't send a complete request in time.\n</body></html>\n";

const char *HTTP_500 =
	"HTTP/1.0 500 Server Error\r\n"
	"Cache-Control: no-cache\r\n"
	"Connection: close\r\n"
	"\r\n"
	"<html><body><h1>500 Server Error</h1>\nAn internal server error occured.\n</body></html>\n";

const char *HTTP_502 =
	"HTTP/1.0 502 Bad Gateway\r\n"
	"Cache-Control: no-cache\r\n"
	"Connection: close\r\n"
	"\r\n"
	"<html><body><h1>502 Bad Gateway</h1>\nThe server returned an invalid or incomplete response.\n</body></html>\n";

const char *HTTP_503 =
	"HTTP/1.0 503 Service Unavailable\r\n"
	"Cache-Control: no-cache\r\n"
	"Connection: close\r\n"
	"\r\n"
	"<html><body><h1>503 Service Unavailable</h1>\nNo server is available to handle this request.\n</body></html>\n";

const char *HTTP_504 =
	"HTTP/1.0 504 Gateway Time-out\r\n"
	"Cache-Control: no-cache\r\n"
	"Connection: close\r\n"
	"\r\n"
	"<html><body><h1>504 Gateway Time-out</h1>\nThe server didn't respond in time.\n</body></html>\n";

/*********************************************************************/
/*  statistics  ******************************************************/
/*********************************************************************/

#if STATTIME > 0
static int stats_tsk_lsrch, stats_tsk_rsrch,
    stats_tsk_good, stats_tsk_right, stats_tsk_left,
    stats_tsk_new, stats_tsk_nsrch;
#endif


/*********************************************************************/
/*  debugging  *******************************************************/
/*********************************************************************/
#ifdef DEBUG_FULL
static char *cli_stnames[5] = {"HDR", "DAT", "SHR", "SHW", "CLS" };
static char *srv_stnames[8] = {"IDL", "PND", "CON", "HDR", "DAT", "SHR", "SHW", "CLS" };
#endif

/*********************************************************************/
/*  function prototypes  *********************************************/
/*********************************************************************/

int event_accept(int fd);
int event_cli_read(int fd);
int event_cli_write(int fd);
int event_srv_read(int fd);
int event_srv_write(int fd);
int process_session(struct task *t);

static int appsession_task_init(void);
static int appsession_init(void);
static int appsession_refresh(struct task *t);

/*********************************************************************/
/*  general purpose functions  ***************************************/
/*********************************************************************/

void display_version() {
    printf("HA-Proxy version " HAPROXY_VERSION " " HAPROXY_DATE"\n");
    printf("Copyright 2000-2006 Willy Tarreau <w@w.ods.org>\n\n");
}

/*
 * This function prints the command line usage and exits
 */
void usage(char *name) {
    display_version();
    fprintf(stderr,
	    "Usage : %s -f <cfgfile> [ -vdV"
#if STATTIME > 0
	    "sl"
#endif
	    "D ] [ -n <maxconn> ] [ -N <maxpconn> ]\n"
	    "        [ -p <pidfile> ] [ -m <max megs> ]\n"
	    "        -v displays version\n"
	    "        -d enters debug mode ; -db only disables background mode.\n"
	    "        -V enters verbose mode (disables quiet mode)\n"
#if STATTIME > 0
	    "        -s enables statistics output\n"
	    "        -l enables long statistics format\n"
#endif
	    "        -D goes daemon ; implies -q\n"
	    "        -q quiet mode : don't display messages\n"
	    "        -c check mode : only check config file and exit\n"
	    "        -n sets the maximum total # of connections (%d)\n"
	    "        -m limits the usable amount of memory (in MB)\n"
	    "        -N sets the default, per-proxy maximum # of connections (%d)\n"
	    "        -p writes pids of all children to this file\n"
#if defined(ENABLE_EPOLL)
	    "        -de disables epoll() usage even when available\n"
#endif
#if defined(ENABLE_POLL)
	    "        -dp disables poll() usage even when available\n"
#endif
	    "        -sf/-st [pid ]* finishes/terminates old pids. Must be last arguments.\n"
	    "\n",
	    name, DEFAULT_MAXCONN, cfg_maxpconn);
    exit(1);
}


/*
 * Displays the message on stderr with the date and pid. Overrides the quiet
 * mode during startup.
 */
void Alert(char *fmt, ...) {
    va_list argp;
    struct timeval tv;
    struct tm *tm;

    if (!(global.mode & MODE_QUIET) || (global.mode & (MODE_VERBOSE | MODE_STARTING))) {
	va_start(argp, fmt);

	gettimeofday(&tv, NULL);
	tm=localtime(&tv.tv_sec);
	fprintf(stderr, "[ALERT] %03d/%02d%02d%02d (%d) : ",
		tm->tm_yday, tm->tm_hour, tm->tm_min, tm->tm_sec, (int)getpid());
	vfprintf(stderr, fmt, argp);
	fflush(stderr);
	va_end(argp);
    }
}


/*
 * Displays the message on stderr with the date and pid.
 */
void Warning(char *fmt, ...) {
    va_list argp;
    struct timeval tv;
    struct tm *tm;

    if (!(global.mode & MODE_QUIET) || (global.mode & MODE_VERBOSE)) {
	va_start(argp, fmt);

	gettimeofday(&tv, NULL);
	tm=localtime(&tv.tv_sec);
	fprintf(stderr, "[WARNING] %03d/%02d%02d%02d (%d) : ",
		tm->tm_yday, tm->tm_hour, tm->tm_min, tm->tm_sec, (int)getpid());
	vfprintf(stderr, fmt, argp);
	fflush(stderr);
	va_end(argp);
    }
}

/*
 * Displays the message on <out> only if quiet mode is not set.
 */
void qfprintf(FILE *out, char *fmt, ...) {
    va_list argp;

    if (!(global.mode & MODE_QUIET) || (global.mode & MODE_VERBOSE)) {
	va_start(argp, fmt);
	vfprintf(out, fmt, argp);
	fflush(out);
	va_end(argp);
    }
}


/*
 * converts <str> to a struct sockaddr_in* which is locally allocated.
 * The format is "addr:port", where "addr" can be empty or "*" to indicate
 * INADDR_ANY.
 */
struct sockaddr_in *str2sa(char *str) {
    static struct sockaddr_in sa;
    char *c;
    int port;

    memset(&sa, 0, sizeof(sa));
    str=strdup(str);

    if ((c=strrchr(str,':')) != NULL) {
	*c++=0;
	port=atol(c);
    }
    else
	port=0;

    if (*str == '*' || *str == '\0') { /* INADDR_ANY */
	sa.sin_addr.s_addr = INADDR_ANY;
    }
    else if (!inet_pton(AF_INET, str, &sa.sin_addr)) {
	struct hostent *he;

	if ((he = gethostbyname(str)) == NULL) {
	    Alert("Invalid server name: '%s'\n", str);
	}
	else
	    sa.sin_addr = *(struct in_addr *) *(he->h_addr_list);
    }
    sa.sin_port=htons(port);
    sa.sin_family=AF_INET;

    free(str);
    return &sa;
}

/*
 * converts <str> to a two struct in_addr* which are locally allocated.
 * The format is "addr[/mask]", where "addr" cannot be empty, and mask
 * is optionnal and either in the dotted or CIDR notation.
 * Note: "addr" can also be a hostname. Returns 1 if OK, 0 if error.
 */
int str2net(char *str, struct in_addr *addr, struct in_addr *mask) {
    char *c;
    unsigned long len;

    memset(mask, 0, sizeof(*mask));
    memset(addr, 0, sizeof(*addr));
    str=strdup(str);

    if ((c = strrchr(str, '/')) != NULL) {
	*c++ = 0;
        /* c points to the mask */
	if (strchr(c, '.') != NULL) {	    /* dotted notation */
	    if (!inet_pton(AF_INET, c, mask))
		return 0;
	}
	else { /* mask length */
	    char *err;
	    len = strtol(c, &err, 10);
	    if (!*c || (err && *err) || (unsigned)len > 32)
		return 0;
	    if (len)
		mask->s_addr = htonl(0xFFFFFFFFUL << (32 - len));
	    else
		mask->s_addr = 0;
	}
    }
    else {
	mask->s_addr = 0xFFFFFFFF;
    }
    if (!inet_pton(AF_INET, str, addr)) {
	struct hostent *he;

	if ((he = gethostbyname(str)) == NULL) {
	    return 0;
	}
	else
	    *addr = *(struct in_addr *) *(he->h_addr_list);
    }
    free(str);
    return 1;
}


/*
 * converts <str> to a list of listeners which are dynamically allocated.
 * The format is "{addr|'*'}:port[-end][,{addr|'*'}:port[-end]]*", where :
 *  - <addr> can be empty or "*" to indicate INADDR_ANY ;
 *  - <port> is a numerical port from 1 to 65535 ;
 *  - <end> indicates to use the range from <port> to <end> instead (inclusive).
 * This can be repeated as many times as necessary, separated by a coma.
 * The <tail> argument is a pointer to a current list which should be appended
 * to the tail of the new list. The pointer to the new list is returned.
 */
struct listener *str2listener(char *str, struct listener *tail) {
    struct listener *l;
    char *c, *next, *range, *dupstr;
    int port, end;

    next = dupstr = strdup(str);
    
    while (next && *next) {
	struct sockaddr_storage ss;

	str = next;
	/* 1) look for the end of the first address */
	if ((next = strrchr(str, ',')) != NULL) {
	    *next++ = 0;
	}

	/* 2) look for the addr/port delimiter, it's the last colon. */
	if ((range = strrchr(str, ':')) == NULL) {
	    Alert("Missing port number: '%s'\n", str);
	    goto fail;
	}	    

	*range++ = 0;

	if (strrchr(str, ':') != NULL) {
	    /* IPv6 address contains ':' */
	    memset(&ss, 0, sizeof(ss));
	    ss.ss_family = AF_INET6;

	    if (!inet_pton(ss.ss_family, str, &((struct sockaddr_in6 *)&ss)->sin6_addr)) {
		Alert("Invalid server address: '%s'\n", str);
		goto fail;
	    }
	}
	else {
	    memset(&ss, 0, sizeof(ss));
	    ss.ss_family = AF_INET;

	    if (*str == '*' || *str == '\0') { /* INADDR_ANY */
		((struct sockaddr_in *)&ss)->sin_addr.s_addr = INADDR_ANY;
	    }
	    else if (!inet_pton(ss.ss_family, str, &((struct sockaddr_in *)&ss)->sin_addr)) {
		struct hostent *he;
		
		if ((he = gethostbyname(str)) == NULL) {
		    Alert("Invalid server name: '%s'\n", str);
		    goto fail;
		}
		else
		    ((struct sockaddr_in *)&ss)->sin_addr =
			*(struct in_addr *) *(he->h_addr_list);
	    }
	}

	/* 3) look for the port-end delimiter */
	if ((c = strchr(range, '-')) != NULL) {
	    *c++ = 0;
	    end = atol(c);
	}
	else {
	    end = atol(range);
	}

	port = atol(range);

	if (port < 1 || port > 65535) {
	    Alert("Invalid port '%d' specified for address '%s'.\n", port, str);
	    goto fail;
	}

	if (end < 1 || end > 65535) {
	    Alert("Invalid port '%d' specified for address '%s'.\n", end, str);
	    goto fail;
	}

	for (; port <= end; port++) {
	    l = (struct listener *)calloc(1, sizeof(struct listener));
	    l->next = tail;
	    tail = l;

	    l->fd = -1;
	    l->addr = ss;
	    if (ss.ss_family == AF_INET6)
		((struct sockaddr_in6 *)(&l->addr))->sin6_port = htons(port);
	    else
		((struct sockaddr_in *)(&l->addr))->sin_port = htons(port);

	} /* end for(port) */
    } /* end while(next) */
    free(dupstr);
    return tail;
 fail:
    free(dupstr);
    return NULL;
}


#define FD_SETS_ARE_BITFIELDS
#ifdef FD_SETS_ARE_BITFIELDS
/*
 * This map is used with all the FD_* macros to check whether a particular bit
 * is set or not. Each bit represents an ACSII code. FD_SET() sets those bytes
 * which should be encoded. When FD_ISSET() returns non-zero, it means that the
 * byte should be encoded. Be careful to always pass bytes from 0 to 255
 * exclusively to the macros.
 */
fd_set hdr_encode_map[(sizeof(fd_set) > (256/8)) ? 1 : ((256/8) / sizeof(fd_set))];
fd_set url_encode_map[(sizeof(fd_set) > (256/8)) ? 1 : ((256/8) / sizeof(fd_set))];

#else
#error "Check if your OS uses bitfields for fd_sets"
#endif

/* will try to encode the string <string> replacing all characters tagged in
 * <map> with the hexadecimal representation of their ASCII-code (2 digits)
 * prefixed by <escape>, and will store the result between <start> (included
 *) and <stop> (excluded), and will always terminate the string with a '\0'
 * before <stop>. The position of the '\0' is returned if the conversion
 * completes. If bytes are missing between <start> and <stop>, then the
 * conversion will be incomplete and truncated. If <stop> <= <start>, the '\0'
 * cannot even be stored so we return <start> without writing the 0.
 * The input string must also be zero-terminated.
 */
char hextab[16] = "0123456789ABCDEF";
char *encode_string(char *start, char *stop,
		    const char escape, const fd_set *map,
		    const char *string)
{
    if (start < stop) {
	stop--; /* reserve one byte for the final '\0' */
	while (start < stop && *string != 0) {
	    if (!FD_ISSET((unsigned char)(*string), map))
		*start++ = *string;
	    else {
		if (start + 3 >= stop)
		    break;
		*start++ = escape;
		*start++ = hextab[(*string >> 4) & 15];
		*start++ = hextab[*string & 15];
	    }
	    string++;
	}
	*start = '\0';
    }
    return start;
}

/*
 * This function sends a syslog message to both log servers of a proxy,
 * or to global log servers if the proxy is NULL.
 * It also tries not to waste too much time computing the message header.
 * It doesn't care about errors nor does it report them.
 */
void send_log(struct proxy *p, int level, char *message, ...) {
    static int logfd = -1;	/* syslog UDP socket */
    static long tvsec = -1;	/* to force the string to be initialized */
    struct timeval tv;
    va_list argp;
    static char logmsg[MAX_SYSLOG_LEN];
    static char *dataptr = NULL;
    int fac_level;
    int hdr_len, data_len;
    struct sockaddr_in *sa[2];
    int facilities[2], loglevel[2];
    int nbloggers = 0;
    char *log_ptr;

    if (logfd < 0) {
	if ((logfd = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP)) < 0)
	    return;
    }
    
    if (level < 0 || progname == NULL || message == NULL)
	return;

    gettimeofday(&tv, NULL);
    if (tv.tv_sec != tvsec || dataptr == NULL) {
	/* this string is rebuild only once a second */
	struct tm *tm = localtime(&tv.tv_sec);
	tvsec = tv.tv_sec;

	hdr_len = snprintf(logmsg, sizeof(logmsg),
			   "<<<<>%s %2d %02d:%02d:%02d %s[%d]: ",
			   monthname[tm->tm_mon],
			   tm->tm_mday, tm->tm_hour, tm->tm_min, tm->tm_sec,
			   progname, pid);
	/* WARNING: depending upon implementations, snprintf may return
	 * either -1 or the number of bytes that would be needed to store
	 * the total message. In both cases, we must adjust it.
	 */
	if (hdr_len < 0 || hdr_len > sizeof(logmsg))
	    hdr_len = sizeof(logmsg);

	dataptr = logmsg + hdr_len;
    }

    va_start(argp, message);
    data_len = vsnprintf(dataptr, logmsg + sizeof(logmsg) - dataptr, message, argp);
    if (data_len < 0 || data_len > (logmsg + sizeof(logmsg) - dataptr))
	data_len = logmsg + sizeof(logmsg) - dataptr;
    va_end(argp);
    dataptr[data_len - 1] = '\n'; /* force a break on ultra-long lines */

    if (p == NULL) {
	if (global.logfac1 >= 0) {
	    sa[nbloggers] = &global.logsrv1;
	    facilities[nbloggers] = global.logfac1;
	    loglevel[nbloggers] = global.loglev1;
	    nbloggers++;
	}
	if (global.logfac2 >= 0) {
	    sa[nbloggers] = &global.logsrv2;
	    facilities[nbloggers] = global.logfac2;
	    loglevel[nbloggers] = global.loglev2;
	    nbloggers++;
	}
    } else {
	if (p->logfac1 >= 0) {
	    sa[nbloggers] = &p->logsrv1;
	    facilities[nbloggers] = p->logfac1;
	    loglevel[nbloggers] = p->loglev1;
	    nbloggers++;
	}
	if (p->logfac2 >= 0) {
	    sa[nbloggers] = &p->logsrv2;
	    facilities[nbloggers] = p->logfac2;
	    loglevel[nbloggers] = p->loglev2;
	    nbloggers++;
	}
    }

    while (nbloggers-- > 0) {
	/* we can filter the level of the messages that are sent to each logger */
	if (level > loglevel[nbloggers])
	    continue;
	
	/* For each target, we may have a different facility.
	 * We can also have a different log level for each message.
	 * This induces variations in the message header length.
	 * Since we don't want to recompute it each time, nor copy it every
	 * time, we only change the facility in the pre-computed header,
	 * and we change the pointer to the header accordingly.
	 */
	fac_level = (facilities[nbloggers] << 3) + level;
	log_ptr = logmsg + 3; /* last digit of the log level */
	do {
	    *log_ptr = '0' + fac_level % 10;
	    fac_level /= 10;
	    log_ptr--;
	} while (fac_level && log_ptr > logmsg);
	*log_ptr = '<';
	
	/* the total syslog message now starts at logptr, for dataptr+data_len-logptr */

#ifndef MSG_NOSIGNAL
	sendto(logfd, log_ptr, dataptr + data_len - log_ptr, MSG_DONTWAIT,
	       (struct sockaddr *)sa[nbloggers], sizeof(**sa));
#else
	sendto(logfd, log_ptr, dataptr + data_len - log_ptr, MSG_DONTWAIT | MSG_NOSIGNAL,
	       (struct sockaddr *)sa[nbloggers], sizeof(**sa));
#endif
    }
}


/* sets <tv> to the current time */
static inline struct timeval *tv_now(struct timeval *tv) {
    if (tv)
	gettimeofday(tv, NULL);
    return tv;
}

/*
 * adds <ms> ms to <from>, set the result to <tv> and returns a pointer <tv>
 */
static inline struct timeval *tv_delayfrom(struct timeval *tv, struct timeval *from, int ms) {
    if (!tv || !from)
	return NULL;
    tv->tv_usec = from->tv_usec + (ms%1000)*1000;
    tv->tv_sec  = from->tv_sec  + (ms/1000);
    while (tv->tv_usec >= 1000000) {
	tv->tv_usec -= 1000000;
	tv->tv_sec++;
    }
    return tv;
}

/*
 * compares <tv1> and <tv2> : returns 0 if equal, -1 if tv1 < tv2, 1 if tv1 > tv2
 * Must not be used when either argument is eternity. Use tv_cmp2() for that.
 */
static inline int tv_cmp(struct timeval *tv1, struct timeval *tv2) {
    if (tv1->tv_sec < tv2->tv_sec)
	return -1;
    else if (tv1->tv_sec > tv2->tv_sec)
	return 1;
    else if (tv1->tv_usec < tv2->tv_usec)
	return -1;
    else if (tv1->tv_usec > tv2->tv_usec)
	return 1;
    else
	return 0;
}

/*
 * returns the absolute difference, in ms, between tv1 and tv2
 * Must not be used when either argument is eternity.
 */
unsigned long tv_delta(struct timeval *tv1, struct timeval *tv2) {
    int cmp;
    unsigned long ret;
  

    cmp = tv_cmp(tv1, tv2);
    if (!cmp)
	return 0; /* same dates, null diff */
    else if (cmp < 0) {
	struct timeval *tmp = tv1;
	tv1 = tv2;
	tv2 = tmp;
    }
    ret = (tv1->tv_sec - tv2->tv_sec) * 1000;
    if (tv1->tv_usec > tv2->tv_usec)
	ret += (tv1->tv_usec - tv2->tv_usec) / 1000;
    else
	ret -= (tv2->tv_usec - tv1->tv_usec) / 1000;
    return (unsigned long) ret;
}

/*
 * returns the difference, in ms, between tv1 and tv2
 * Must not be used when either argument is eternity.
 */
static inline unsigned long tv_diff(struct timeval *tv1, struct timeval *tv2) {
    unsigned long ret;
  
    ret = (tv2->tv_sec - tv1->tv_sec) * 1000;
    if (tv2->tv_usec > tv1->tv_usec)
	ret += (tv2->tv_usec - tv1->tv_usec) / 1000;
    else
	ret -= (tv1->tv_usec - tv2->tv_usec) / 1000;
    return (unsigned long) ret;
}

/*
 * compares <tv1> and <tv2> modulo 1ms: returns 0 if equal, -1 if tv1 < tv2, 1 if tv1 > tv2
 * Must not be used when either argument is eternity. Use tv_cmp2_ms() for that.
 */
static inline int tv_cmp_ms(struct timeval *tv1, struct timeval *tv2) {
    if (tv1->tv_sec == tv2->tv_sec) {
	if (tv2->tv_usec >= tv1->tv_usec + 1000)
	    return -1;
	else if (tv1->tv_usec >= tv2->tv_usec + 1000)
	    return 1;
	else
	    return 0;
    }
    else if ((tv2->tv_sec > tv1->tv_sec + 1) ||
	     ((tv2->tv_sec == tv1->tv_sec + 1) && (tv2->tv_usec + 1000000 >= tv1->tv_usec + 1000)))
	return -1;
    else if ((tv1->tv_sec > tv2->tv_sec + 1) ||
	     ((tv1->tv_sec == tv2->tv_sec + 1) && (tv1->tv_usec + 1000000 >= tv2->tv_usec + 1000)))
	return 1;
    else
	return 0;
}

/*
 * returns the remaining time between tv1=now and event=tv2
 * if tv2 is passed, 0 is returned.
 * Must not be used when either argument is eternity.
 */
static inline unsigned long tv_remain(struct timeval *tv1, struct timeval *tv2) {
    unsigned long ret;
  
    if (tv_cmp_ms(tv1, tv2) >= 0)
	return 0; /* event elapsed */

    ret = (tv2->tv_sec - tv1->tv_sec) * 1000;
    if (tv2->tv_usec > tv1->tv_usec)
	ret += (tv2->tv_usec - tv1->tv_usec) / 1000;
    else
	ret -= (tv1->tv_usec - tv2->tv_usec) / 1000;
    return (unsigned long) ret;
}


/*
 * zeroes a struct timeval
 */

static inline struct timeval *tv_eternity(struct timeval *tv) {
    tv->tv_sec = tv->tv_usec = 0;
    return tv;
}

/*
 * returns 1 if tv is null, else 0
 */
static inline int tv_iseternity(struct timeval *tv) {
    if (tv->tv_sec == 0 && tv->tv_usec == 0)
	return 1;
    else
	return 0;
}

/*
 * compares <tv1> and <tv2> : returns 0 if equal, -1 if tv1 < tv2, 1 if tv1 > tv2,
 * considering that 0 is the eternity.
 */
static inline int tv_cmp2(struct timeval *tv1, struct timeval *tv2) {
    if (tv_iseternity(tv1))
	if (tv_iseternity(tv2))
	    return 0; /* same */
	else
	    return 1; /* tv1 later than tv2 */
    else if (tv_iseternity(tv2))
	return -1; /* tv2 later than tv1 */
    
    if (tv1->tv_sec > tv2->tv_sec)
	return 1;
    else if (tv1->tv_sec < tv2->tv_sec)
	return -1;
    else if (tv1->tv_usec > tv2->tv_usec)
	return 1;
    else if (tv1->tv_usec < tv2->tv_usec)
	return -1;
    else
	return 0;
}

/*
 * compares <tv1> and <tv2> modulo 1 ms: returns 0 if equal, -1 if tv1 < tv2, 1 if tv1 > tv2,
 * considering that 0 is the eternity.
 */
static inline int tv_cmp2_ms(struct timeval *tv1, struct timeval *tv2) {
    if (tv_iseternity(tv1))
	if (tv_iseternity(tv2))
	    return 0; /* same */
	else
	    return 1; /* tv1 later than tv2 */
    else if (tv_iseternity(tv2))
	return -1; /* tv2 later than tv1 */
    
    if (tv1->tv_sec == tv2->tv_sec) {
	if (tv1->tv_usec >= tv2->tv_usec + 1000)
	    return 1;
	else if (tv2->tv_usec >= tv1->tv_usec + 1000)
	    return -1;
	else
	    return 0;
    }
    else if ((tv1->tv_sec > tv2->tv_sec + 1) ||
	     ((tv1->tv_sec == tv2->tv_sec + 1) && (tv1->tv_usec + 1000000 >= tv2->tv_usec + 1000)))
	return 1;
    else if ((tv2->tv_sec > tv1->tv_sec + 1) ||
	     ((tv2->tv_sec == tv1->tv_sec + 1) && (tv2->tv_usec + 1000000 >= tv1->tv_usec + 1000)))
	return -1;
    else
	return 0;
}

/*
 * returns the remaining time between tv1=now and event=tv2
 * if tv2 is passed, 0 is returned.
 * Returns TIME_ETERNITY if tv2 is eternity.
 */
static inline unsigned long tv_remain2(struct timeval *tv1, struct timeval *tv2) {
    unsigned long ret;

    if (tv_iseternity(tv2))
	return TIME_ETERNITY;

    if (tv_cmp_ms(tv1, tv2) >= 0)
	return 0; /* event elapsed */

    ret = (tv2->tv_sec - tv1->tv_sec) * 1000;
    if (tv2->tv_usec > tv1->tv_usec)
	ret += (tv2->tv_usec - tv1->tv_usec) / 1000;
    else
	ret -= (tv1->tv_usec - tv2->tv_usec) / 1000;
    return (unsigned long) ret;
}

/*
 * returns the first event between tv1 and tv2 into tvmin.
 * a zero tv is ignored. tvmin is returned.
 */
static inline struct timeval *tv_min(struct timeval *tvmin,
				     struct timeval *tv1, struct timeval *tv2) {

    if (tv_cmp2(tv1, tv2) <= 0)
	*tvmin = *tv1;
    else
	*tvmin = *tv2;

    return tvmin;
}



/***********************************************************/
/*   fd management   ***************************************/
/***********************************************************/



/* Deletes an FD from the fdsets, and recomputes the maxfd limit.
 * The file descriptor is also closed.
 */
static inline void fd_delete(int fd) {
    FD_CLR(fd, StaticReadEvent);
    FD_CLR(fd, StaticWriteEvent);
#if defined(ENABLE_EPOLL)
    if (PrevReadEvent) {
	FD_CLR(fd, PrevReadEvent);
	FD_CLR(fd, PrevWriteEvent);
    }
#endif

    close(fd);
    fdtab[fd].state = FD_STCLOSE;

    while ((maxfd-1 >= 0) && (fdtab[maxfd-1].state == FD_STCLOSE))
	    maxfd--;
}

/* recomputes the maxfd limit from the fd */
static inline void fd_insert(int fd) {
    if (fd+1 > maxfd)
	maxfd = fd+1;
}

/*************************************************************/
/*   task management   ***************************************/
/*************************************************************/

/* puts the task <t> in run queue <q>, and returns <t> */
static inline struct task *task_wakeup(struct task **q, struct task *t) {
    if (t->state == TASK_RUNNING)
	return t;
    else {
	t->rqnext = *q;
	t->state = TASK_RUNNING;
	return *q = t;
    }
}

/* removes the task <t> from the queue <q>
 * <s> MUST be <q>'s first task.
 * set the run queue to point to the next one, and return it
 */
static inline struct task *task_sleep(struct task **q, struct task *t) {
    if (t->state == TASK_RUNNING) {
	*q = t->rqnext;
	t->state = TASK_IDLE; /* tell that s has left the run queue */
    }
    return *q; /* return next running task */
}

/*
 * removes the task <t> from its wait queue. It must have already been removed
 * from the run queue. A pointer to the task itself is returned.
 */
static inline struct task *task_delete(struct task *t) {
    t->prev->next = t->next;
    t->next->prev = t->prev;
    return t;
}

/*
 * frees a task. Its context must have been freed since it will be lost.
 */
static inline void task_free(struct task *t) {
    pool_free(task, t);
}

/* inserts <task> into its assigned wait queue, where it may already be. In this case, it
 * may be only moved or left where it was, depending on its timing requirements.
 * <task> is returned.
 */
struct task *task_queue(struct task *task) {
    struct task *list = task->wq;
    struct task *start_from;

    /* This is a very dirty hack to queue non-expirable tasks in another queue
     * in order to avoid pulluting the tail of the standard queue. This will go
     * away with the new O(log(n)) scheduler anyway.
     */
    if (tv_iseternity(&task->expire)) {
	/* if the task was queued in the standard wait queue, we must dequeue it */
	if (task->prev) {
	    if (task->wq == LIST_HEAD(wait_queue[1]))
		return task;
	    else {
		task_delete(task);
		task->prev = NULL;
	    }
	}
	list = task->wq = LIST_HEAD(wait_queue[1]);
    } else {
	/* if the task was queued in the eternity queue, we must dequeue it */
	if (task->prev && (task->wq == LIST_HEAD(wait_queue[1]))) {
	    task_delete(task);
	    task->prev = NULL;
	    list = task->wq = LIST_HEAD(wait_queue[0]);
	}
    }

    /* next, test if the task was already in a list */
    if (task->prev == NULL) {
	//	start_from = list;
	start_from = list->prev;
#if STATTIME > 0
	stats_tsk_new++;
#endif
	/* insert the unlinked <task> into the list, searching back from the last entry */
	while (start_from != list && tv_cmp2(&task->expire, &start_from->expire) < 0) {
	    start_from = start_from->prev;
#if STATTIME > 0
	    stats_tsk_nsrch++;
#endif
	}
	
	//	  while (start_from->next != list && tv_cmp2(&task->expire, &start_from->next->expire) > 0) {
	//	      start_from = start_from->next;
	//	      stats_tsk_nsrch++;
	//	  }
    }	
    else if (task->prev == list ||
	     tv_cmp2(&task->expire, &task->prev->expire) >= 0) { /* walk right */
	start_from = task->next;
	if (start_from == list || tv_cmp2(&task->expire, &start_from->expire) <= 0) {
#if STATTIME > 0
	    stats_tsk_good++;
#endif
	    return task; /* it's already in the right place */
	}

#if STATTIME > 0
	stats_tsk_right++;
#endif

	/* if the task is not at the right place, there's little chance that
	 * it has only shifted a bit, and it will nearly always be queued
	 * at the end of the list because of constant timeouts
	 * (observed in real case).
	 */
#ifndef WE_REALLY_THINK_THAT_THIS_TASK_MAY_HAVE_SHIFTED
	start_from = list->prev; /* assume we'll queue to the end of the list */
	while (start_from != list && tv_cmp2(&task->expire, &start_from->expire) < 0) {
	    start_from = start_from->prev;
#if STATTIME > 0
	    stats_tsk_lsrch++;
#endif
	}
#else /* WE_REALLY_... */
	/* insert the unlinked <task> into the list, searching after position <start_from> */
	while (start_from->next != list && tv_cmp2(&task->expire, &start_from->next->expire) > 0) {
	    start_from = start_from->next;
#if STATTIME > 0
	    stats_tsk_rsrch++;
#endif
	}
#endif /* WE_REALLY_... */

	/* we need to unlink it now */
	task_delete(task);
    }
    else { /* walk left. */
#if STATTIME > 0
	stats_tsk_left++;
#endif
#ifdef LEFT_TO_TOP	/* not very good */
	start_from = list;
	while (start_from->next != list && tv_cmp2(&task->expire, &start_from->next->expire) > 0) {
	    start_from = start_from->next;
#if STATTIME > 0
	    stats_tsk_lsrch++;
#endif
	}
#else
	start_from = task->prev->prev; /* valid because of the previous test above */
	while (start_from != list && tv_cmp2(&task->expire, &start_from->expire) < 0) {
	    start_from = start_from->prev;
#if STATTIME > 0
	    stats_tsk_lsrch++;
#endif
	}
#endif
	/* we need to unlink it now */
	task_delete(task);
    }
    task->prev = start_from;
    task->next = start_from->next;
    task->next->prev = task;
    start_from->next = task;
    return task;
}


/*********************************************************************/
/*   pending connections queues **************************************/
/*********************************************************************/

/*
 * Detaches pending connection <p>, decreases the pending count, and frees
 * the pending connection. The connection might have been queued to a specific
 * server as well as to the proxy. The session also gets marked unqueued.
 */
static void pendconn_free(struct pendconn *p) {
    LIST_DEL(&p->list);
    p->sess->pend_pos = NULL;
    if (p->srv)
	p->srv->nbpend--;
    else
	p->sess->proxy->nbpend--;
    p->sess->proxy->totpend--;
    pool_free(pendconn, p);
}

/* Returns the first pending connection for server <s>, which may be NULL if
 * nothing is pending.
 */
static inline struct pendconn *pendconn_from_srv(struct server *s) {
    if (!s->nbpend)
	return NULL;

    return LIST_ELEM(s->pendconns.n, struct pendconn *, list);
}

/* Returns the first pending connection for proxy <px>, which may be NULL if
 * nothing is pending.
 */
static inline struct pendconn *pendconn_from_px(struct proxy *px) {
    if (!px->nbpend)
	return NULL;

    return LIST_ELEM(px->pendconns.n, struct pendconn *, list);
}

/* Detaches the next pending connection for either current session's server or
 * current session's proxy, and returns its associated session. If no pending
 * connection is found, NULL is returned. Note that cur->srv cannot be NULL.
 */
static struct session *pendconn_get_next_sess(struct session *cur) {
    struct pendconn *p;
    struct session *sess;

    p = pendconn_from_srv(cur->srv);
    if (!p) {
	p = pendconn_from_px(cur->proxy);
	if (!p)
	    return NULL;
	p->sess->srv = cur->srv;
    }
    sess = p->sess;
    pendconn_free(p);
    return sess;
}

/* Checks if other sessions are waiting for the same server, and wakes the
 * first one up. Note that cur->srv cannot be NULL.
 */
void offer_connection_slot(struct session *cur) {
    struct session *sess;

    sess = pendconn_get_next_sess(cur);
    if (sess == NULL)
	return;
    task_wakeup(&rq, sess->task);
}

/* Adds the session <sess> to the pending connection list of server <sess>->srv
 * or to the one of <sess>->proxy if srv is NULL. All counters and back pointers
 * are updated accordingly. Returns NULL if no memory is available, otherwise the
 * pendconn itself.
 */
static struct pendconn *pendconn_add(struct session *sess) {
    struct pendconn *p;

    p = pool_alloc(pendconn);
    if (!p)
	return NULL;

    sess->pend_pos = p;
    p->sess = sess;
    p->srv  = sess->srv;
    if (sess->srv) {
	LIST_ADDQ(&sess->srv->pendconns, &p->list);
	sess->srv->nbpend++;
    } else {
	LIST_ADDQ(&sess->proxy->pendconns, &p->list);
	sess->proxy->nbpend++;
    }
    sess->proxy->totpend++;
    return p;
}

/*********************************************************************/
/*   more specific functions   ***************************************/
/*********************************************************************/

/* some prototypes */
static int maintain_proxies(void);

/* This either returns the sockname or the original destination address. Code
 * inspired from Patrick Schaaf's example of nf_getsockname() implementation.
 */
static int get_original_dst(int fd, struct sockaddr_in *sa, socklen_t *salen) {
#if defined(TPROXY) && defined(SO_ORIGINAL_DST)
    return getsockopt(fd, SOL_IP, SO_ORIGINAL_DST, (void *)sa, salen);
#else
#if defined(TPROXY) && defined(USE_GETSOCKNAME)
    return getsockname(fd, (struct sockaddr *)sa, salen);
#else
    return -1;
#endif
#endif
}

/*
 * frees  the context associated to a session. It must have been removed first.
 */
static void session_free(struct session *s) {
    if (s->pend_pos)
	pendconn_free(s->pend_pos);
    if (s->req)
	pool_free(buffer, s->req);
    if (s->rep)
	pool_free(buffer, s->rep);

    if (s->rsp_cap != NULL) {
	struct cap_hdr *h;
	for (h = s->proxy->rsp_cap; h; h = h->next) {
	    if (s->rsp_cap[h->index] != NULL)
		pool_free_to(h->pool, s->rsp_cap[h->index]);
	}
	pool_free_to(s->proxy->rsp_cap_pool, s->rsp_cap);
    }
    if (s->req_cap != NULL) {
	struct cap_hdr *h;
	for (h = s->proxy->req_cap; h; h = h->next) {
	    if (s->req_cap[h->index] != NULL)
		pool_free_to(h->pool, s->req_cap[h->index]);
	}
	pool_free_to(s->proxy->req_cap_pool, s->req_cap);
    }

    if (s->logs.uri)
	pool_free(requri, s->logs.uri);
    if (s->logs.cli_cookie)
	pool_free(capture, s->logs.cli_cookie);
    if (s->logs.srv_cookie)
	pool_free(capture, s->logs.srv_cookie);

    pool_free(session, s);
}


/*
 * This function recounts the number of usable active and backup servers for
 * proxy <p>. These numbers are returned into the p->srv_act and p->srv_bck.
 * This function also recomputes the total active and backup weights.
 */
static void recount_servers(struct proxy *px) {
    struct server *srv;

    px->srv_act = 0; px->srv_bck = px->tot_wact = px->tot_wbck = 0;
    for (srv = px->srv; srv != NULL; srv = srv->next) {
        if (srv->state & SRV_RUNNING) {
            if (srv->state & SRV_BACKUP) {
                px->srv_bck++;
                px->tot_wbck += srv->eweight + 1;
            } else {
                px->srv_act++;
                px->tot_wact += srv->eweight + 1;
            }
        }
    }
}

/* This function recomputes the server map for proxy px. It
 * relies on px->tot_wact and px->tot_wbck, so it must be
 * called after recount_servers(). It also expects px->srv_map
 * to be initialized to the largest value needed.
 */
static void recalc_server_map(struct proxy *px) {
    int o, tot, flag;
    struct server *cur, *best;

    if (px->srv_act) {
	flag = SRV_RUNNING;
	tot  = px->tot_wact;
    } else if (px->srv_bck) {
	flag = SRV_RUNNING | SRV_BACKUP;
	if (px->options & PR_O_USE_ALL_BK)
	    tot = px->tot_wbck;
	else
	    tot = 1; /* the first server is enough */
    } else {
	px->srv_map_sz = 0;
	return;
    }

    /* this algorithm gives priority to the first server, which means that
     * it will respect the declaration order for equivalent weights, and
     * that whatever the weights, the first server called will always be
     * the first declard. This is an important asumption for the backup
     * case, where we want the first server only.
     */
    for (cur = px->srv; cur; cur = cur->next)
	cur->wscore = 0;

    for (o = 0; o < tot; o++) {
	int max = 0;
	best = NULL;
	for (cur = px->srv; cur; cur = cur->next) {
	    if ((cur->state & (SRV_RUNNING | SRV_BACKUP)) == flag) {
		int v;

		/* If we are forced to return only one server, we don't want to
		 * go further, because we would return the wrong one due to
		 * divide overflow.
		 */
		if (tot == 1) {
		    best = cur;
		    break;
		}

		cur->wscore += cur->eweight + 1;
		v = (cur->wscore + tot) / tot; /* result between 0 and 3 */
		if (best == NULL || v > max) {
		    max = v;
		    best = cur;
		}
	    }
	}
	px->srv_map[o] = best;
	best->wscore -= tot;
    }
    px->srv_map_sz = tot;
}

/*
 * This function tries to find a running server with free connection slots for
 * the proxy <px> following the round-robin method.
 * If any server is found, it will be returned and px->srv_rr_idx will be updated
 * to point to the next server. If no valid server is found, NULL is returned.
 */
static inline struct server *get_server_rr_with_conns(struct proxy *px) {
    int newidx;
    struct server *srv;

    if (px->srv_map_sz == 0)
	return NULL;

    if (px->srv_rr_idx < 0 || px->srv_rr_idx >= px->srv_map_sz)
	px->srv_rr_idx = 0;
    newidx = px->srv_rr_idx;

    do {
	srv = px->srv_map[newidx++];
	if (!srv->maxconn || srv->cur_sess < srv->maxconn) {
	    px->srv_rr_idx = newidx;
	    return srv;
	}
	if (newidx == px->srv_map_sz)
	    newidx = 0;
    } while (newidx != px->srv_rr_idx);

    return NULL;
}


/*
 * This function tries to find a running server for the proxy <px> following
 * the round-robin method.
 * If any server is found, it will be returned and px->srv_rr_idx will be updated
 * to point to the next server. If no valid server is found, NULL is returned.
 */
static inline struct server *get_server_rr(struct proxy *px) {
    if (px->srv_map_sz == 0)
	return NULL;

    if (px->srv_rr_idx < 0 || px->srv_rr_idx >= px->srv_map_sz)
	px->srv_rr_idx = 0;
    return px->srv_map[px->srv_rr_idx++];
}


/*
 * This function tries to find a running server for the proxy <px> following
 * the source hash method. Depending on the number of active/backup servers,
 * it will either look for active servers, or for backup servers.
 * If any server is found, it will be returned. If no valid server is found,
 * NULL is returned.
 */
static inline struct server *get_server_sh(struct proxy *px, char *addr, int len) {
    unsigned int h, l;

    if (px->srv_map_sz == 0)
	return NULL;

    l = h = 0;
    if (px->srv_act > 1 || (px->srv_act == 0 && px->srv_bck > 1)) {
	while ((l + sizeof (int)) <= len) {
	    h ^= ntohl(*(unsigned int *)(&addr[l]));
	    l += sizeof (int);
	}
	h %= px->srv_map_sz;
    }
    return px->srv_map[h];
}


/*
 * This function marks the session as 'assigned' in direct or dispatch modes,
 * or tries to assign one in balance mode, according to the algorithm. It does
 * nothing if the session had already been assigned a server.
 *
 * It may return :
 *   SRV_STATUS_OK       if everything is OK.
 *   SRV_STATUS_NOSRV    if no server is available
 *   SRV_STATUS_FULL     if all servers are saturated
 *   SRV_STATUS_INTERNAL for other unrecoverable errors.
 *
 * Upon successful return, the session flag SN_ASSIGNED to indicate that it does
 * not need to be called anymore. This usually means that s->srv can be trusted
 * in balance and direct modes. This flag is not cleared, so it's to the caller
 * to clear it if required (eg: redispatch).
 *
 */

int assign_server(struct session *s) {
#ifdef DEBUG_FULL
    fprintf(stderr,"assign_server : s=%p\n",s);
#endif

    if (s->pend_pos)
	return SRV_STATUS_INTERNAL;

    if (!(s->flags & SN_ASSIGNED)) {
        if ((s->proxy->options & PR_O_BALANCE) && !(s->flags & SN_DIRECT)) {
	    if (!s->proxy->srv_act && !s->proxy->srv_bck)
		return SRV_STATUS_NOSRV;

	    if (s->proxy->options & PR_O_BALANCE_RR) {
		s->srv = get_server_rr_with_conns(s->proxy);
		if (!s->srv)
		    return SRV_STATUS_FULL;
	    }
	    else if (s->proxy->options & PR_O_BALANCE_SH) {
		int len;
		
		if (s->cli_addr.ss_family == AF_INET)
		    len = 4;
		else if (s->cli_addr.ss_family == AF_INET6)
		    len = 16;
		else /* unknown IP family */
		    return SRV_STATUS_INTERNAL;
		
		s->srv = get_server_sh(s->proxy,
				       (void *)&((struct sockaddr_in *)&s->cli_addr)->sin_addr,
				       len);
	    }
	    else /* unknown balancing algorithm */
		return SRV_STATUS_INTERNAL;
	}
	s->flags |= SN_ASSIGNED;
    }
    return SRV_STATUS_OK;
}

/*
 * This function assigns a server address to a session, and sets SN_ADDR_SET.
 * The address is taken from the currently assigned server, or from the
 * dispatch or transparent address.
 *
 * It may return :
 *   SRV_STATUS_OK       if everything is OK.
 *   SRV_STATUS_INTERNAL for other unrecoverable errors.
 *
 * Upon successful return, the session flag SN_ADDR_SET is set. This flag is
 * not cleared, so it's to the caller to clear it if required.
 *
 */
int assign_server_address(struct session *s) {
#ifdef DEBUG_FULL
    fprintf(stderr,"assign_server_address : s=%p\n",s);
#endif

    if (s->flags & SN_DIRECT || s->proxy->options & PR_O_BALANCE) {
	/* A server is necessarily known for this session */
	if (!(s->flags & SN_ASSIGNED))
	    return SRV_STATUS_INTERNAL;

	s->srv_addr = s->srv->addr;

	/* if this server remaps proxied ports, we'll use
	 * the port the client connected to with an offset. */
	if (s->srv->state & SRV_MAPPORTS) {
	    struct sockaddr_in sockname;
	    socklen_t namelen = sizeof(sockname);

	    if (!(s->proxy->options & PR_O_TRANSP) ||
		get_original_dst(s->cli_fd, (struct sockaddr_in *)&sockname, &namelen) == -1)
		getsockname(s->cli_fd, (struct sockaddr *)&sockname, &namelen);
	    s->srv_addr.sin_port = htons(ntohs(s->srv_addr.sin_port) + ntohs(sockname.sin_port));
	}
    }
    else if (*(int *)&s->proxy->dispatch_addr.sin_addr) {
	/* connect to the defined dispatch addr */
	s->srv_addr = s->proxy->dispatch_addr;
    }
    else if (s->proxy->options & PR_O_TRANSP) {
	/* in transparent mode, use the original dest addr if no dispatch specified */
	socklen_t salen = sizeof(s->srv_addr);

	if (get_original_dst(s->cli_fd, &s->srv_addr, &salen) == -1) {
	    qfprintf(stderr, "Cannot get original server address.\n");
	    return SRV_STATUS_INTERNAL;
	}
    }

    s->flags |= SN_ADDR_SET;
    return SRV_STATUS_OK;
}

/* This function assigns a server to session <s> if required, and can add the
 * connection to either the assigned server's queue or to the proxy's queue.
 *
 * Returns :
 *
 *   SRV_STATUS_OK       if everything is OK.
 *   SRV_STATUS_NOSRV    if no server is available
 *   SRV_STATUS_QUEUED   if the connection has been queued.
 *   SRV_STATUS_FULL     if the server(s) is/are saturated and the
 *                       connection could not be queued.
 *   SRV_STATUS_INTERNAL for other unrecoverable errors.
 *
 */
int assign_server_and_queue(struct session *s) {
    struct pendconn *p;
    int err;

    if (s->pend_pos)
	return SRV_STATUS_INTERNAL;

    if (s->flags & SN_ASSIGNED) {
	/* a server does not need to be assigned, perhaps because we're in
	 * direct mode, or in dispatch or transparent modes where the server
	 * is not needed.
	 */
	if (s->srv &&
	    s->srv->maxconn && s->srv->cur_sess >= s->srv->maxconn) {
	    p = pendconn_add(s);
	    if (p)
		return SRV_STATUS_QUEUED;
	    else
		return SRV_STATUS_FULL;
	}
	return SRV_STATUS_OK;
    }

    /* a server needs to be assigned */
    err = assign_server(s);
    switch (err) {
    case SRV_STATUS_OK:
	/* in balance mode, we might have servers with connection limits */
	if (s->srv != NULL &&
	    s->srv->maxconn && s->srv->cur_sess >= s->srv->maxconn) {
	    p = pendconn_add(s);
	    if (p)
		return SRV_STATUS_QUEUED;
	    else
		return SRV_STATUS_FULL;
	}
	return SRV_STATUS_OK;

    case SRV_STATUS_FULL:
	/* queue this session into the proxy's queue */
	p = pendconn_add(s);
	if (p)
	    return SRV_STATUS_QUEUED;
	else
	    return SRV_STATUS_FULL;

    case SRV_STATUS_NOSRV:
    case SRV_STATUS_INTERNAL:
	return err;
    default:
	return SRV_STATUS_INTERNAL;
    }
}


/*
 * This function initiates a connection to the server assigned to this session
 * (s->srv, s->srv_addr). It will assign a server if none is assigned yet.
 * It can return one of :
 *  - SN_ERR_NONE if everything's OK
 *  - SN_ERR_SRVTO if there are no more servers
 *  - SN_ERR_SRVCL if the connection was refused by the server
 *  - SN_ERR_PRXCOND if the connection has been limited by the proxy (maxconn)
 *  - SN_ERR_RESOURCE if a system resource is lacking (eg: fd limits, ports, ...)
 *  - SN_ERR_INTERNAL for any other purely internal errors
 * Additionnally, in the case of SN_ERR_RESOURCE, an emergency log will be emitted.
 */
int connect_server(struct session *s) {
    int fd, err;

    if (!(s->flags & SN_ADDR_SET)) {
	err = assign_server_address(s);
	if (err != SRV_STATUS_OK)
	    return SN_ERR_INTERNAL;
    }

    if ((fd = s->srv_fd = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP)) == -1) {
	qfprintf(stderr, "Cannot get a server socket.\n");

	if (errno == ENFILE)
	    send_log(s->proxy, LOG_EMERG,
		     "Proxy %s reached system FD limit at %d. Please check system tunables.\n",
		     s->proxy->id, maxfd);
	else if (errno == EMFILE)
	    send_log(s->proxy, LOG_EMERG,
		     "Proxy %s reached process FD limit at %d. Please check 'ulimit-n' and restart.\n",
		     s->proxy->id, maxfd);
	else if (errno == ENOBUFS || errno == ENOMEM)
	    send_log(s->proxy, LOG_EMERG,
		     "Proxy %s reached system memory limit at %d sockets. Please check system tunables.\n",
		     s->proxy->id, maxfd);
	/* this is a resource error */
	return SN_ERR_RESOURCE;
    }
	
    if (fd >= global.maxsock) {
        /* do not log anything there, it's a normal condition when this option
	 * is used to serialize connections to a server !
	 */
	Alert("socket(): not enough free sockets. Raise -n argument. Giving up.\n");
	close(fd);
	return SN_ERR_PRXCOND; /* it is a configuration limit */
    }

    if ((fcntl(fd, F_SETFL, O_NONBLOCK)==-1) ||
	(setsockopt(fd, IPPROTO_TCP, TCP_NODELAY, (char *) &one, sizeof(one)) == -1)) {
	qfprintf(stderr,"Cannot set client socket to non blocking mode.\n");
	close(fd);
	return SN_ERR_INTERNAL;
    }

    if (s->proxy->options & PR_O_TCP_SRV_KA)
	setsockopt(fd, SOL_SOCKET, SO_KEEPALIVE, (char *) &one, sizeof(one));

    /* allow specific binding :
     * - server-specific at first
     * - proxy-specific next
     */
    if (s->srv != NULL && s->srv->state & SRV_BIND_SRC) {
	setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, (char *) &one, sizeof(one));
	if (bind(fd, (struct sockaddr *)&s->srv->source_addr, sizeof(s->srv->source_addr)) == -1) {
	    Alert("Cannot bind to source address before connect() for server %s/%s. Aborting.\n",
		  s->proxy->id, s->srv->id);
	    close(fd);
	    send_log(s->proxy, LOG_EMERG,
		     "Cannot bind to source address before connect() for server %s/%s.\n",
		     s->proxy->id, s->srv->id);
	    return SN_ERR_RESOURCE;
	}
    }
    else if (s->proxy->options & PR_O_BIND_SRC) {
	setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, (char *) &one, sizeof(one));
	if (bind(fd, (struct sockaddr *)&s->proxy->source_addr, sizeof(s->proxy->source_addr)) == -1) {
	    Alert("Cannot bind to source address before connect() for proxy %s. Aborting.\n", s->proxy->id);
	    close(fd);
	    send_log(s->proxy, LOG_EMERG,
		     "Cannot bind to source address before connect() for server %s/%s.\n",
		     s->proxy->id, s->srv->id);
	    return SN_ERR_RESOURCE;
	}
    }
	
    if ((connect(fd, (struct sockaddr *)&s->srv_addr, sizeof(s->srv_addr)) == -1) &&
	(errno != EINPROGRESS) && (errno != EALREADY) && (errno != EISCONN)) {

	if (errno == EAGAIN || errno == EADDRINUSE) {
	    char *msg;
	    if (errno == EAGAIN) /* no free ports left, try again later */
		msg = "no free ports";
	    else
		msg = "local address already in use";

	    qfprintf(stderr,"Cannot connect: %s.\n",msg);
	    close(fd);
	    send_log(s->proxy, LOG_EMERG,
		     "Connect() failed for server %s/%s: %s.\n",
		     s->proxy->id, s->srv->id, msg);
	    return SN_ERR_RESOURCE;
	} else if (errno == ETIMEDOUT) {
	    //qfprintf(stderr,"Connect(): ETIMEDOUT");
	    close(fd);
	    return SN_ERR_SRVTO;
	} else {
	    // (errno == ECONNREFUSED || errno == ENETUNREACH || errno == EACCES || errno == EPERM)
	    //qfprintf(stderr,"Connect(): %d", errno);
	    close(fd);
	    return SN_ERR_SRVCL;
	}
    }

    fdtab[fd].owner = s->task;
    fdtab[fd].read  = &event_srv_read;
    fdtab[fd].write = &event_srv_write;
    fdtab[fd].state = FD_STCONN; /* connection in progress */
    
    FD_SET(fd, StaticWriteEvent);  /* for connect status */
#if defined(DEBUG_FULL) && defined(ENABLE_EPOLL)
    if (PrevReadEvent) {
	    assert(!(FD_ISSET(fd, PrevReadEvent)));
	    assert(!(FD_ISSET(fd, PrevWriteEvent)));
    }
#endif
    
    fd_insert(fd);
    if (s->srv)
	s->srv->cur_sess++;

    if (s->proxy->contimeout)
	tv_delayfrom(&s->cnexpire, &now, s->proxy->contimeout);
    else
	tv_eternity(&s->cnexpire);
    return SN_ERR_NONE;  /* connection is OK */
}
    
/*
 * this function is called on a read event from a client socket.
 * It returns 0.
 */
int event_cli_read(int fd) {
    struct task *t = fdtab[fd].owner;
    struct session *s = t->context;
    struct buffer *b = s->req;
    int ret, max;

#ifdef DEBUG_FULL
    fprintf(stderr,"event_cli_read : fd=%d, s=%p\n", fd, s);
#endif

    if (fdtab[fd].state != FD_STERROR) {
#ifdef FILL_BUFFERS
	while (1)
#else
	do
#endif
	{
	    if (b->l == 0) { /* let's realign the buffer to optimize I/O */
		b->r = b->w = b->h = b->lr  = b->data;
		max = b->rlim - b->data;
	    }
	    else if (b->r > b->w) {
		max = b->rlim - b->r;
	    }
	    else {
		max = b->w - b->r;
		/* FIXME: theorically, if w>0, we shouldn't have rlim < data+size anymore
		 * since it means that the rewrite protection has been removed. This
		 * implies that the if statement can be removed.
		 */
		if (max > b->rlim - b->data)
		    max = b->rlim - b->data;
	    }
	    
	    if (max == 0) {  /* not anymore room to store data */
		FD_CLR(fd, StaticReadEvent);
		break;
	    }
	    
#ifndef MSG_NOSIGNAL
	    {
		int skerr;
		socklen_t lskerr = sizeof(skerr);
		
		getsockopt(fd, SOL_SOCKET, SO_ERROR, &skerr, &lskerr);
		if (skerr)
		    ret = -1;
		else
		    ret = recv(fd, b->r, max, 0);
	    }
#else
	    ret = recv(fd, b->r, max, MSG_NOSIGNAL);
#endif
	    if (ret > 0) {
		b->r += ret;
		b->l += ret;
		s->res_cr = RES_DATA;
		
		if (b->r == b->data + BUFSIZE) {
		    b->r = b->data; /* wrap around the buffer */
		}

		b->total += ret;
		/* we hope to read more data or to get a close on next round */
		continue;
	    }
	    else if (ret == 0) {
		s->res_cr = RES_NULL;
		break;
	    }
	    else if (errno == EAGAIN) {/* ignore EAGAIN */
		break;
	    }
	    else {
		s->res_cr = RES_ERROR;
		fdtab[fd].state = FD_STERROR;
		break;
	    }
	} /* while(1) */
#ifndef FILL_BUFFERS
	while (0);
#endif
    }
    else {
	s->res_cr = RES_ERROR;
	fdtab[fd].state = FD_STERROR;
    }

    if (s->res_cr != RES_SILENT) {
	if (s->proxy->clitimeout && FD_ISSET(fd, StaticReadEvent))
	    tv_delayfrom(&s->crexpire, &now, s->proxy->clitimeout);
	else
	    tv_eternity(&s->crexpire);
	
	task_wakeup(&rq, t);
    }

    return 0;
}


/*
 * this function is called on a read event from a server socket.
 * It returns 0.
 */
int event_srv_read(int fd) {
    struct task *t = fdtab[fd].owner;
    struct session *s = t->context;
    struct buffer *b = s->rep;
    int ret, max;

#ifdef DEBUG_FULL
    fprintf(stderr,"event_srv_read : fd=%d, s=%p\n", fd, s);
#endif

    if (fdtab[fd].state != FD_STERROR) {
#ifdef FILL_BUFFERS
	while (1)
#else
	do
#endif
	{
	    if (b->l == 0) { /* let's realign the buffer to optimize I/O */
		b->r = b->w = b->h = b->lr  = b->data;
		max = b->rlim - b->data;
	    }
	    else if (b->r > b->w) {
		max = b->rlim - b->r;
	    }
	    else {
		max = b->w - b->r;
		/* FIXME: theorically, if w>0, we shouldn't have rlim < data+size anymore
		 * since it means that the rewrite protection has been removed. This
		 * implies that the if statement can be removed.
		 */
		if (max > b->rlim - b->data)
		    max = b->rlim - b->data;
	    }
	    
	    if (max == 0) {  /* not anymore room to store data */
		FD_CLR(fd, StaticReadEvent);
		break;
	    }

#ifndef MSG_NOSIGNAL
	    {
		int skerr;
		socklen_t lskerr = sizeof(skerr);

		getsockopt(fd, SOL_SOCKET, SO_ERROR, &skerr, &lskerr);
		if (skerr)
		    ret = -1;
		else
		    ret = recv(fd, b->r, max, 0);
	    }
#else
	    ret = recv(fd, b->r, max, MSG_NOSIGNAL);
#endif
	    if (ret > 0) {
		b->r += ret;
		b->l += ret;
		s->res_sr = RES_DATA;
	    
		if (b->r == b->data + BUFSIZE) {
		    b->r = b->data; /* wrap around the buffer */
		}

		b->total += ret;
		/* we hope to read more data or to get a close on next round */
		continue;
	    }
	    else if (ret == 0) {
		s->res_sr = RES_NULL;
		break;
	    }
	    else if (errno == EAGAIN) {/* ignore EAGAIN */
		break;
	    }
	    else {
		s->res_sr = RES_ERROR;
		fdtab[fd].state = FD_STERROR;
		break;
	    }
	} /* while(1) */
#ifndef FILL_BUFFERS
	while (0);
#endif
    }
    else {
	s->res_sr = RES_ERROR;
	fdtab[fd].state = FD_STERROR;
    }

    if (s->res_sr != RES_SILENT) {
	if (s->proxy->srvtimeout && FD_ISSET(fd, StaticReadEvent))
	    tv_delayfrom(&s->srexpire, &now, s->proxy->srvtimeout);
	else
	    tv_eternity(&s->srexpire);
	
	task_wakeup(&rq, t);
    }

    return 0;
}

/*
 * this function is called on a write event from a client socket.
 * It returns 0.
 */
int event_cli_write(int fd) {
    struct task *t = fdtab[fd].owner;
    struct session *s = t->context;
    struct buffer *b = s->rep;
    int ret, max;

#ifdef DEBUG_FULL
    fprintf(stderr,"event_cli_write : fd=%d, s=%p\n", fd, s);
#endif

    if (b->l == 0) { /* let's realign the buffer to optimize I/O */
	b->r = b->w = b->h = b->lr  = b->data;
	//	max = BUFSIZE;		BUG !!!!
	max = 0;
    }
    else if (b->r > b->w) {
	max = b->r - b->w;
    }
    else
	max = b->data + BUFSIZE - b->w;
    
    if (fdtab[fd].state != FD_STERROR) {
	if (max == 0) {
	    s->res_cw = RES_NULL;
	    task_wakeup(&rq, t);
	    tv_eternity(&s->cwexpire);
	    FD_CLR(fd, StaticWriteEvent);
	    return 0;
	}

#ifndef MSG_NOSIGNAL
	{
	    int skerr;
	    socklen_t lskerr = sizeof(skerr);

	    getsockopt(fd, SOL_SOCKET, SO_ERROR, &skerr, &lskerr);
	    if (skerr)
		ret = -1;
	    else
		ret = send(fd, b->w, max, MSG_DONTWAIT);
	}
#else
	ret = send(fd, b->w, max, MSG_DONTWAIT | MSG_NOSIGNAL);
#endif

	if (ret > 0) {
	    b->l -= ret;
	    b->w += ret;
	    
	    s->res_cw = RES_DATA;
	    
	    if (b->w == b->data + BUFSIZE) {
		b->w = b->data; /* wrap around the buffer */
	    }
	}
	else if (ret == 0) {
	    /* nothing written, just make as if we were never called */
//	    s->res_cw = RES_NULL;
	    return 0;
	}
	else if (errno == EAGAIN) /* ignore EAGAIN */
	    return 0;
	else {
	    s->res_cw = RES_ERROR;
	    fdtab[fd].state = FD_STERROR;
	}
    }
    else {
	s->res_cw = RES_ERROR;
	fdtab[fd].state = FD_STERROR;
    }

    if (s->proxy->clitimeout) {
	tv_delayfrom(&s->cwexpire, &now, s->proxy->clitimeout);
	/* FIXME: to prevent the client from expiring read timeouts during writes,
	 * we refresh it. A solution would be to merge read+write timeouts into a
	 * unique one, although that needs some study particularly on full-duplex
	 * TCP connections. */
	s->crexpire = s->cwexpire;
    }
    else
	tv_eternity(&s->cwexpire);

    task_wakeup(&rq, t);
    return 0;
}


/*
 * this function is called on a write event from a server socket.
 * It returns 0.
 */
int event_srv_write(int fd) {
    struct task *t = fdtab[fd].owner;
    struct session *s = t->context;
    struct buffer *b = s->req;
    int ret, max;

#ifdef DEBUG_FULL
    fprintf(stderr,"event_srv_write : fd=%d, s=%p\n", fd, s);
#endif

    if (b->l == 0) { /* let's realign the buffer to optimize I/O */
	b->r = b->w = b->h = b->lr = b->data;
	//	max = BUFSIZE;		BUG !!!!
	max = 0;
    }
    else if (b->r > b->w) {
	max = b->r - b->w;
    }
    else
	max = b->data + BUFSIZE - b->w;
    
    if (fdtab[fd].state != FD_STERROR) {
	if (max == 0) {
	    /* may be we have received a connection acknowledgement in TCP mode without data */
	    if (s->srv_state == SV_STCONN) {
		int skerr;
		socklen_t lskerr = sizeof(skerr);
		getsockopt(fd, SOL_SOCKET, SO_ERROR, &skerr, &lskerr);
		if (skerr) {
		    s->res_sw = RES_ERROR;
		    fdtab[fd].state = FD_STERROR;
		    task_wakeup(&rq, t);
		    tv_eternity(&s->swexpire);
		    FD_CLR(fd, StaticWriteEvent);
		    return 0;
		}
	    }

	    s->res_sw = RES_NULL;
	    task_wakeup(&rq, t);
	    fdtab[fd].state = FD_STREADY;
	    tv_eternity(&s->swexpire);
	    FD_CLR(fd, StaticWriteEvent);
	    return 0;
	}

#ifndef MSG_NOSIGNAL
	{
	    int skerr;
	    socklen_t lskerr = sizeof(skerr);
	    getsockopt(fd, SOL_SOCKET, SO_ERROR, &skerr, &lskerr);
	    if (skerr)
		ret = -1;
	    else
		ret = send(fd, b->w, max, MSG_DONTWAIT);
	}
#else
	ret = send(fd, b->w, max, MSG_DONTWAIT | MSG_NOSIGNAL);
#endif
	fdtab[fd].state = FD_STREADY;
	if (ret > 0) {
	    b->l -= ret;
	    b->w += ret;
	    
	    s->res_sw = RES_DATA;
	    
	    if (b->w == b->data + BUFSIZE) {
		b->w = b->data; /* wrap around the buffer */
	    }
	}
	else if (ret == 0) {
	    /* nothing written, just make as if we were never called */
	    // s->res_sw = RES_NULL;
	    return 0;
	}
	else if (errno == EAGAIN) /* ignore EAGAIN */
	    return 0;
	else {
	    s->res_sw = RES_ERROR;
	    fdtab[fd].state = FD_STERROR;
	}
    }
    else {
	s->res_sw = RES_ERROR;
	fdtab[fd].state = FD_STERROR;
    }

    /* We don't want to re-arm read/write timeouts if we're trying to connect,
     * otherwise it could loop indefinitely !
     */
    if (s->srv_state != SV_STCONN) {
	if (s->proxy->srvtimeout) {
	    tv_delayfrom(&s->swexpire, &now, s->proxy->srvtimeout);
	    /* FIXME: to prevent the server from expiring read timeouts during writes,
	     * we refresh it. A solution would be to merge read+write+connect timeouts
	     * into a unique one since we don't mind expiring on read or write, and none
	     * of them is enabled while waiting for connect(), although that needs some
	     * study particularly on full-duplex TCP connections. */
	    s->srexpire = s->swexpire;
	}
	else
	    tv_eternity(&s->swexpire);
    }

    task_wakeup(&rq, t);
    return 0;
}


/*
 * returns a message to the client ; the connection is shut down for read,
 * and the request is cleared so that no server connection can be initiated.
 * The client must be in a valid state for this (HEADER, DATA ...).
 * Nothing is performed on the server side.
 * The reply buffer doesn't need to be empty before this.
 */
void client_retnclose(struct session *s, int len, const char *msg) {
    FD_CLR(s->cli_fd, StaticReadEvent);
    FD_SET(s->cli_fd, StaticWriteEvent);
    tv_eternity(&s->crexpire);
    tv_delayfrom(&s->cwexpire, &now, s->proxy->clitimeout);
    shutdown(s->cli_fd, SHUT_RD);
    s->cli_state = CL_STSHUTR;
    strcpy(s->rep->data, msg);
    s->rep->l = len;
    s->rep->r = s->rep->h = s->rep->lr = s->rep->w = s->rep->data;
    s->rep->r += len;
    s->req->l = 0;
}


/*
 * returns a message into the rep buffer, and flushes the req buffer.
 * The reply buffer doesn't need to be empty before this.
 */
void client_return(struct session *s, int len, const char *msg) {
    strcpy(s->rep->data, msg);
    s->rep->l = len;
    s->rep->r = s->rep->h = s->rep->lr = s->rep->w = s->rep->data;
    s->rep->r += len;
    s->req->l = 0;
}

/*
 * send a log for the session when we have enough info about it
 */
void sess_log(struct session *s) {
    char pn[INET6_ADDRSTRLEN + strlen(":65535")];
    struct proxy *p = s->proxy;
    int log;
    char *uri;
    char *pxid;
    char *srv;
    struct tm *tm;

    /* This is a first attempt at a better logging system.
     * For now, we rely on send_log() to provide the date, although it obviously
     * is the date of the log and not of the request, and most fields are not
     * computed.
     */

    log = p->to_log & ~s->logs.logwait;

    if (s->cli_addr.ss_family == AF_INET)
	inet_ntop(AF_INET,
		  (const void *)&((struct sockaddr_in *)&s->cli_addr)->sin_addr,
		  pn, sizeof(pn));
    else
	inet_ntop(AF_INET6,
		  (const void *)&((struct sockaddr_in6 *)(&s->cli_addr))->sin6_addr,
		  pn, sizeof(pn));

    uri = (log & LW_REQ) ? s->logs.uri ? s->logs.uri : "<BADREQ>" : "";
    pxid = p->id;
    srv = (p->to_log & LW_SVID) ? (s->srv != NULL) ? s->srv->id : "<NOSRV>" : "-";

    tm = localtime(&s->logs.tv_accept.tv_sec);
    if (p->to_log & LW_REQ) {
	char tmpline[MAX_SYSLOG_LEN], *h;
	int hdr;
	
	h = tmpline;
	if (p->to_log & LW_REQHDR && (h < tmpline + sizeof(tmpline) - 10)) {
	    *(h++) = ' ';
	    *(h++) = '{';
	    for (hdr = 0; hdr < p->nb_req_cap; hdr++) {
		if (hdr)
		    *(h++) = '|';
		if (s->req_cap[hdr] != NULL)
		    h = encode_string(h, tmpline + sizeof(tmpline) - 7, '#', hdr_encode_map, s->req_cap[hdr]);
	    }
	    *(h++) = '}';
	}

	if (p->to_log & LW_RSPHDR && (h < tmpline + sizeof(tmpline) - 7)) {
	    *(h++) = ' ';
	    *(h++) = '{';
	    for (hdr = 0; hdr < p->nb_rsp_cap; hdr++) {
		if (hdr)
		    *(h++) = '|';
		if (s->rsp_cap[hdr] != NULL)
		    h = encode_string(h, tmpline + sizeof(tmpline) - 4, '#', hdr_encode_map, s->rsp_cap[hdr]);
	    }
	    *(h++) = '}';
	}

	if (h < tmpline + sizeof(tmpline) - 4) {
	    *(h++) = ' ';
	    *(h++) = '"';
	    h = encode_string(h, tmpline + sizeof(tmpline) - 1, '#', url_encode_map, uri);
	    *(h++) = '"';
	}
	*h = '\0';

	send_log(p, LOG_INFO, "%s:%d [%02d/%s/%04d:%02d:%02d:%02d] %s %s %d/%d/%d/%d/%s%d %d %s%lld %s %s %c%c%c%c %d/%d/%d/%d%s\n",
		 pn,
		 (s->cli_addr.ss_family == AF_INET) ?
		   ntohs(((struct sockaddr_in *)&s->cli_addr)->sin_port) :
		   ntohs(((struct sockaddr_in6 *)&s->cli_addr)->sin6_port),
		 tm->tm_mday, monthname[tm->tm_mon], tm->tm_year+1900,
		 tm->tm_hour, tm->tm_min, tm->tm_sec,
		 pxid, srv,
		 s->logs.t_request,
		 (s->logs.t_queue >= 0) ? s->logs.t_queue - s->logs.t_request : -1,
		 (s->logs.t_connect >= 0) ? s->logs.t_connect - s->logs.t_queue : -1,
		 (s->logs.t_data >= 0) ? s->logs.t_data - s->logs.t_connect : -1,
		 (p->to_log & LW_BYTES) ? "" : "+", s->logs.t_close,
		 s->logs.status,
		 (p->to_log & LW_BYTES) ? "" : "+", s->logs.bytes,
		 s->logs.cli_cookie ? s->logs.cli_cookie : "-",
		 s->logs.srv_cookie ? s->logs.srv_cookie : "-",
		 sess_term_cond[(s->flags & SN_ERR_MASK) >> SN_ERR_SHIFT],
		 sess_fin_state[(s->flags & SN_FINST_MASK) >> SN_FINST_SHIFT],
		 (p->options & PR_O_COOK_ANY) ? sess_cookie[(s->flags & SN_CK_MASK) >> SN_CK_SHIFT] : '-',
		 (p->options & PR_O_COOK_ANY) ? sess_set_cookie[(s->flags & SN_SCK_MASK) >> SN_SCK_SHIFT] : '-',
		 s->srv ? s->srv->cur_sess : 0, s->logs.queue_size,
		 p->nbconn, actconn, tmpline);
    }
    else {
	send_log(p, LOG_INFO, "%s:%d [%02d/%s/%04d:%02d:%02d:%02d] %s %s %d/%s%d %s%lld %c%c %d/%d/%d/%d\n",
		 pn,
		 (s->cli_addr.ss_family == AF_INET) ?
		   ntohs(((struct sockaddr_in *)&s->cli_addr)->sin_port) :
		   ntohs(((struct sockaddr_in6 *)&s->cli_addr)->sin6_port),
		 tm->tm_mday, monthname[tm->tm_mon], tm->tm_year+1900,
		 tm->tm_hour, tm->tm_min, tm->tm_sec,
		 pxid, srv,
		 (s->logs.t_connect >= 0) ? s->logs.t_connect : -1,
		 (p->to_log & LW_BYTES) ? "" : "+", s->logs.t_close,
		 (p->to_log & LW_BYTES) ? "" : "+", s->logs.bytes,
		 sess_term_cond[(s->flags & SN_ERR_MASK) >> SN_ERR_SHIFT],
		 sess_fin_state[(s->flags & SN_FINST_MASK) >> SN_FINST_SHIFT],
		 s->srv ? s->srv->cur_sess : 0, s->logs.queue_size,
		 p->nbconn, actconn);
    }

    s->logs.logwait = 0;
}


/*
 * this function is called on a read event from a listen socket, corresponding
 * to an accept. It tries to accept as many connections as possible.
 * It returns 0.
 */
int event_accept(int fd) {
    struct proxy *p = (struct proxy *)fdtab[fd].owner;
    struct session *s;
    struct task *t;
    int cfd;
    int max_accept;

    if (global.nbproc > 1)
	    max_accept = 8; /* let other processes catch some connections too */
    else
	    max_accept = -1;

    while (p->nbconn < p->maxconn && max_accept--) {
	struct sockaddr_storage addr;
	socklen_t laddr = sizeof(addr);

	if ((cfd = accept(fd, (struct sockaddr *)&addr, &laddr)) == -1) {
	    switch (errno) {
	    case EAGAIN:
	    case EINTR:
	    case ECONNABORTED:
		return 0;	    /* nothing more to accept */
	    case ENFILE:
		send_log(p, LOG_EMERG,
			 "Proxy %s reached system FD limit at %d. Please check system tunables.\n",
			 p->id, maxfd);
		return 0;
	    case EMFILE:
		send_log(p, LOG_EMERG,
			 "Proxy %s reached process FD limit at %d. Please check 'ulimit-n' and restart.\n",
			 p->id, maxfd);
		return 0;
	    case ENOBUFS:
	    case ENOMEM:
		send_log(p, LOG_EMERG,
			 "Proxy %s reached system memory limit at %d sockets. Please check system tunables.\n",
			 p->id, maxfd);
		return 0;
	    default:
		return 0;
	    }
	}

	if ((s = pool_alloc(session)) == NULL) { /* disable this proxy for a while */
	    Alert("out of memory in event_accept().\n");
	    FD_CLR(fd, StaticReadEvent);
	    p->state = PR_STIDLE;
	    close(cfd);
	    return 0;
	}

	/* if this session comes from a known monitoring system, we want to ignore
	 * it as soon as possible, which means closing it immediately for TCP.
	 */
	s->flags = 0;
	if (addr.ss_family == AF_INET &&
	    p->mon_mask.s_addr &&
	    (((struct sockaddr_in *)&addr)->sin_addr.s_addr & p->mon_mask.s_addr) == p->mon_net.s_addr) {
	    if (p->mode == PR_MODE_TCP) {
		close(cfd);
		pool_free(session, s);
		continue;
	    }
	    s->flags |= SN_MONITOR;
	}

	if ((t = pool_alloc(task)) == NULL) { /* disable this proxy for a while */
	    Alert("out of memory in event_accept().\n");
	    FD_CLR(fd, StaticReadEvent);
	    p->state = PR_STIDLE;
	    close(cfd);
	    pool_free(session, s);
	    return 0;
	}

	s->cli_addr = addr;
	if (cfd >= global.maxsock) {
	    Alert("accept(): not enough free sockets. Raise -n argument. Giving up.\n");
	    close(cfd);
	    pool_free(task, t);
	    pool_free(session, s);
	    return 0;
	}

	if ((fcntl(cfd, F_SETFL, O_NONBLOCK) == -1) ||
	    (setsockopt(cfd, IPPROTO_TCP, TCP_NODELAY,
			(char *) &one, sizeof(one)) == -1)) {
	    Alert("accept(): cannot set the socket in non blocking mode. Giving up\n");
	    close(cfd);
	    pool_free(task, t);
	    pool_free(session, s);
	    return 0;
	}

	if (p->options & PR_O_TCP_CLI_KA)
	    setsockopt(cfd, SOL_SOCKET, SO_KEEPALIVE, (char *) &one, sizeof(one));

	t->next = t->prev = t->rqnext = NULL; /* task not in run queue yet */
	t->wq = LIST_HEAD(wait_queue[0]); /* but already has a wait queue assigned */
	t->state = TASK_IDLE;
	t->process = process_session;
	t->context = s;

	s->task = t;
	s->proxy = p;
	s->cli_state = (p->mode == PR_MODE_HTTP) ?  CL_STHEADERS : CL_STDATA; /* no HTTP headers for non-HTTP proxies */
	s->srv_state = SV_STIDLE;
	s->req = s->rep = NULL; /* will be allocated later */

	s->res_cr = s->res_cw = s->res_sr = s->res_sw = RES_SILENT;
	s->cli_fd = cfd;
	s->srv_fd = -1;
	s->srv = NULL;
	s->conn_retries = p->conn_retries;

	if (s->flags & SN_MONITOR)
	    s->logs.logwait = 0;
	else
	    s->logs.logwait = p->to_log;

	s->logs.tv_accept = now;
	s->logs.t_request = -1;
	s->logs.t_queue = -1;
	s->logs.t_connect = -1;
	s->logs.t_data = -1;
	s->logs.t_close = 0;
	s->logs.uri = NULL;
	s->logs.cli_cookie = NULL;
	s->logs.srv_cookie = NULL;
	s->logs.status = -1;
	s->logs.bytes = 0;
	s->logs.queue_size = p->totpend;  /* we get the number of pending conns before us */

	s->uniq_id = totalconn;
	p->cum_conn++;

	if (p->nb_req_cap > 0) {
	    if ((s->req_cap =
		 pool_alloc_from(p->req_cap_pool, p->nb_req_cap*sizeof(char *)))
		== NULL) { /* no memory */
		close(cfd); /* nothing can be done for this fd without memory */
		pool_free(task, t);
		pool_free(session, s);
		return 0;
	    }
	    memset(s->req_cap, 0, p->nb_req_cap*sizeof(char *));
	}
	else
	    s->req_cap = NULL;

	if (p->nb_rsp_cap > 0) {
	    if ((s->rsp_cap =
		 pool_alloc_from(p->rsp_cap_pool, p->nb_rsp_cap*sizeof(char *)))
		== NULL) { /* no memory */
		if (s->req_cap != NULL)
		    pool_free_to(p->req_cap_pool, s->req_cap);
		close(cfd); /* nothing can be done for this fd without memory */
		pool_free(task, t);
		pool_free(session, s);
		return 0;
	    }
	    memset(s->rsp_cap, 0, p->nb_rsp_cap*sizeof(char *));
	}
	else
	    s->rsp_cap = NULL;

	if ((p->mode == PR_MODE_TCP || p->mode == PR_MODE_HTTP)
	    && (p->logfac1 >= 0 || p->logfac2 >= 0)) {
	    struct sockaddr_storage sockname;
	    socklen_t namelen = sizeof(sockname);

	    if (addr.ss_family != AF_INET ||
		!(s->proxy->options & PR_O_TRANSP) ||
		get_original_dst(cfd, (struct sockaddr_in *)&sockname, &namelen) == -1)
		getsockname(cfd, (struct sockaddr *)&sockname, &namelen);

	    if (p->to_log) {
		/* we have the client ip */
		if (s->logs.logwait & LW_CLIP)
		    if (!(s->logs.logwait &= ~LW_CLIP))
			sess_log(s);
	    }
	    else if (s->cli_addr.ss_family == AF_INET) {
		char pn[INET_ADDRSTRLEN], sn[INET_ADDRSTRLEN];
		if (inet_ntop(AF_INET, (const void *)&((struct sockaddr_in *)&sockname)->sin_addr,
			      sn, sizeof(sn)) &&
		    inet_ntop(AF_INET, (const void *)&((struct sockaddr_in *)&s->cli_addr)->sin_addr,
			      pn, sizeof(pn))) {
		    send_log(p, LOG_INFO, "Connect from %s:%d to %s:%d (%s/%s)\n",
			     pn, ntohs(((struct sockaddr_in *)&s->cli_addr)->sin_port),
			     sn, ntohs(((struct sockaddr_in *)&sockname)->sin_port),
			     p->id, (p->mode == PR_MODE_HTTP) ? "HTTP" : "TCP");
		}
	    }
	    else {
		char pn[INET6_ADDRSTRLEN], sn[INET6_ADDRSTRLEN];
		if (inet_ntop(AF_INET6, (const void *)&((struct sockaddr_in6 *)&sockname)->sin6_addr,
			      sn, sizeof(sn)) &&
		    inet_ntop(AF_INET6, (const void *)&((struct sockaddr_in6 *)&s->cli_addr)->sin6_addr,
			      pn, sizeof(pn))) {
		    send_log(p, LOG_INFO, "Connect from %s:%d to %s:%d (%s/%s)\n",
			     pn, ntohs(((struct sockaddr_in6 *)&s->cli_addr)->sin6_port),
			     sn, ntohs(((struct sockaddr_in6 *)&sockname)->sin6_port),
			     p->id, (p->mode == PR_MODE_HTTP) ? "HTTP" : "TCP");
		}
	    }
	}

	if ((global.mode & MODE_DEBUG) && (!(global.mode & MODE_QUIET) || (global.mode & MODE_VERBOSE))) {
	    struct sockaddr_in sockname;
	    socklen_t namelen = sizeof(sockname);
	    int len;
	    if (addr.ss_family != AF_INET ||
		!(s->proxy->options & PR_O_TRANSP) ||
		get_original_dst(cfd, (struct sockaddr_in *)&sockname, &namelen) == -1)
		getsockname(cfd, (struct sockaddr *)&sockname, &namelen);

	    if (s->cli_addr.ss_family == AF_INET) {
		char pn[INET_ADDRSTRLEN];
		inet_ntop(AF_INET,
			  (const void *)&((struct sockaddr_in *)&s->cli_addr)->sin_addr,
			  pn, sizeof(pn));

		len = sprintf(trash, "%08x:%s.accept(%04x)=%04x from [%s:%d]\n",
			      s->uniq_id, p->id, (unsigned short)fd, (unsigned short)cfd,
			      pn, ntohs(((struct sockaddr_in *)&s->cli_addr)->sin_port));
	    }
	    else {
		char pn[INET6_ADDRSTRLEN];
		inet_ntop(AF_INET6,
			  (const void *)&((struct sockaddr_in6 *)(&s->cli_addr))->sin6_addr,
			  pn, sizeof(pn));

		len = sprintf(trash, "%08x:%s.accept(%04x)=%04x from [%s:%d]\n",
			      s->uniq_id, p->id, (unsigned short)fd, (unsigned short)cfd,
			      pn, ntohs(((struct sockaddr_in6 *)(&s->cli_addr))->sin6_port));
	    }

	    write(1, trash, len);
	}

	if ((s->req = pool_alloc(buffer)) == NULL) { /* no memory */
	    if (s->rsp_cap != NULL)
		pool_free_to(p->rsp_cap_pool, s->rsp_cap);
	    if (s->req_cap != NULL)
		pool_free_to(p->req_cap_pool, s->req_cap);
	    close(cfd); /* nothing can be done for this fd without memory */
	    pool_free(task, t);
	    pool_free(session, s);
	    return 0;
	}

	s->req->l = 0;
	s->req->total = 0;
	s->req->h = s->req->r = s->req->lr = s->req->w = s->req->data;	/* r and w will be reset further */
	s->req->rlim = s->req->data + BUFSIZE;
	if (s->cli_state == CL_STHEADERS) /* reserve some space for header rewriting */
	    s->req->rlim -= MAXREWRITE;

	if ((s->rep = pool_alloc(buffer)) == NULL) { /* no memory */
	    pool_free(buffer, s->req);
	    if (s->rsp_cap != NULL)
		pool_free_to(p->rsp_cap_pool, s->rsp_cap);
	    if (s->req_cap != NULL)
		pool_free_to(p->req_cap_pool, s->req_cap);
	    close(cfd); /* nothing can be done for this fd without memory */
	    pool_free(task, t);
	    pool_free(session, s);
	    return 0;
	}
	s->rep->l = 0;
	s->rep->total = 0;
	s->rep->h = s->rep->r = s->rep->lr = s->rep->w = s->rep->rlim = s->rep->data;

	fdtab[cfd].read  = &event_cli_read;
	fdtab[cfd].write = &event_cli_write;
	fdtab[cfd].owner = t;
	fdtab[cfd].state = FD_STREADY;

	if ((p->mode == PR_MODE_HTTP && (s->flags & SN_MONITOR)) ||
	    (p->mode == PR_MODE_HEALTH && (p->options & PR_O_HTTP_CHK)))
	    /* Either we got a request from a monitoring system on an HTTP instance,
	     * or we're in health check mode with the 'httpchk' option enabled. In
	     * both cases, we return a fake "HTTP/1.0 200 OK" response and we exit.
	     */
	    client_retnclose(s, 19, "HTTP/1.0 200 OK\r\n\r\n"); /* forge a 200 response */
	else if (p->mode == PR_MODE_HEALTH) {  /* health check mode, no client reading */
	    client_retnclose(s, 3, "OK\n"); /* forge an "OK" response */
	}
	else {
	    FD_SET(cfd, StaticReadEvent);
	}

#if defined(DEBUG_FULL) && defined(ENABLE_EPOLL)
	if (PrevReadEvent) {
	    assert(!(FD_ISSET(cfd, PrevReadEvent)));
	    assert(!(FD_ISSET(cfd, PrevWriteEvent)));
	}
#endif
	fd_insert(cfd);

	tv_eternity(&s->cnexpire);
	tv_eternity(&s->srexpire);
	tv_eternity(&s->swexpire);
	tv_eternity(&s->crexpire);
	tv_eternity(&s->cwexpire);

	if (s->proxy->clitimeout) {
	    if (FD_ISSET(cfd, StaticReadEvent))
		tv_delayfrom(&s->crexpire, &now, s->proxy->clitimeout);
	    if (FD_ISSET(cfd, StaticWriteEvent))
		tv_delayfrom(&s->cwexpire, &now, s->proxy->clitimeout);
	}

	tv_min(&t->expire, &s->crexpire, &s->cwexpire);

	task_queue(t);

	if (p->mode != PR_MODE_HEALTH)
	    task_wakeup(&rq, t);

	p->nbconn++;
	actconn++;
	totalconn++;

	// fprintf(stderr, "accepting from %p => %d conn, %d total, task=%p\n", p, actconn, totalconn, t);
    } /* end of while (p->nbconn < p->maxconn) */
    return 0;
}


/*
 * This function is used only for server health-checks. It handles
 * the connection acknowledgement. If the proxy requires HTTP health-checks,
 * it sends the request. In other cases, it returns 1 if the socket is OK,
 * or -1 if an error occured.
 */
int event_srv_chk_w(int fd) {
    struct task *t = fdtab[fd].owner;
    struct server *s = t->context;
    int skerr;
    socklen_t lskerr = sizeof(skerr);

    skerr = 1;
    if ((getsockopt(fd, SOL_SOCKET, SO_ERROR, &skerr, &lskerr) == -1)
	|| (skerr != 0)) {
        /* in case of TCP only, this tells us if the connection failed */
	s->result = -1;
	fdtab[fd].state = FD_STERROR;
	FD_CLR(fd, StaticWriteEvent);
    }
    else if (s->result != -1) {
	/* we don't want to mark 'UP' a server on which we detected an error earlier */
	if (s->proxy->options & PR_O_HTTP_CHK) {
	    int ret;
	    /* we want to check if this host replies to "OPTIONS / HTTP/1.0"
	     * so we'll send the request, and won't wake the checker up now.
	     */
#ifndef MSG_NOSIGNAL
	    ret = send(fd, s->proxy->check_req, s->proxy->check_len, MSG_DONTWAIT);
#else
	    ret = send(fd, s->proxy->check_req, s->proxy->check_len, MSG_DONTWAIT | MSG_NOSIGNAL);
#endif
	    if (ret == s->proxy->check_len) {
		FD_SET(fd, StaticReadEvent);   /* prepare for reading reply */
		FD_CLR(fd, StaticWriteEvent);  /* nothing more to write */
		return 0;
	    }
	    else {
		s->result = -1;
		FD_CLR(fd, StaticWriteEvent);
	    }
	}
	else {
	    /* good TCP connection is enough */
	    s->result = 1;
	}
    }

    task_wakeup(&rq, t);
    return 0;
}


/*
 * This function is used only for server health-checks. It handles
 * the server's reply to an HTTP request. It returns 1 if the server replies
 * 2xx or 3xx (valid responses), or -1 in other cases.
 */
int event_srv_chk_r(int fd) {
    char reply[64];
    int len, result;
    struct task *t = fdtab[fd].owner;
    struct server *s = t->context;
    int skerr;
    socklen_t lskerr = sizeof(skerr);

    result = len = -1;

    getsockopt(fd, SOL_SOCKET, SO_ERROR, &skerr, &lskerr);
    if (!skerr) {
#ifndef MSG_NOSIGNAL
	    len = recv(fd, reply, sizeof(reply), 0);
#else
	    /* Warning! Linux returns EAGAIN on SO_ERROR if data are still available
	     * but the connection was closed on the remote end. Fortunately, recv still
	     * works correctly and we don't need to do the getsockopt() on linux.
	     */
	    len = recv(fd, reply, sizeof(reply), MSG_NOSIGNAL);
#endif

	    if ((len >= sizeof("HTTP/1.0 000")) &&
		!memcmp(reply, "HTTP/1.", 7) &&
		(reply[9] == '2' || reply[9] == '3')) /* 2xx or 3xx */
		    result = 1;
    }

    if (result == -1)
	    fdtab[fd].state = FD_STERROR;

    if (s->result != -1)
	s->result = result;

    FD_CLR(fd, StaticReadEvent);
    task_wakeup(&rq, t);
    return 0;
}


/*
 * this function writes the string <str> at position <pos> which must be in buffer <b>,
 * and moves <end> just after the end of <str>.
 * <b>'s parameters (l, r, w, h, lr) are recomputed to be valid after the shift.
 * the shift value (positive or negative) is returned.
 * If there's no space left, the move is not done.
 *
 */
int buffer_replace(struct buffer *b, char *pos, char *end, char *str) {
    int delta;
    int len;

    len = strlen(str);
    delta = len - (end - pos);

    if (delta + b->r >= b->data + BUFSIZE)
	return 0;  /* no space left */

    /* first, protect the end of the buffer */
    memmove(end + delta, end, b->data + b->l - end);

    /* now, copy str over pos */
    memcpy(pos, str,len);

    /* we only move data after the displaced zone */
    if (b->r  > pos) b->r  += delta;
    if (b->w  > pos) b->w  += delta;
    if (b->h  > pos) b->h  += delta;
    if (b->lr > pos) b->lr += delta;
    b->l += delta;

    return delta;
}

/* same except that the string length is given, which allows str to be NULL if
 * len is 0.
 */
int buffer_replace2(struct buffer *b, char *pos, char *end, char *str, int len) {
    int delta;

    delta = len - (end - pos);

    if (delta + b->r >= b->data + BUFSIZE)
	return 0;  /* no space left */

    if (b->data + b->l < end)
	/* The data has been stolen, we could have crashed. Maybe we should abort() ? */
	return 0;

    /* first, protect the end of the buffer */
    memmove(end + delta, end, b->data + b->l - end);

    /* now, copy str over pos */
    if (len)
	memcpy(pos, str, len);

    /* we only move data after the displaced zone */
    if (b->r  > pos) b->r  += delta;
    if (b->w  > pos) b->w  += delta;
    if (b->h  > pos) b->h  += delta;
    if (b->lr > pos) b->lr += delta;
    b->l += delta;

    return delta;
}


int exp_replace(char *dst, char *src, char *str, regmatch_t *matches) {
    char *old_dst = dst;

    while (*str) {
	if (*str == '\\') {
	    str++;
	    if (isdigit((int)*str)) {
		int len, num;

		num = *str - '0';
		str++;

		if (matches[num].rm_eo > -1 && matches[num].rm_so > -1) {
		    len = matches[num].rm_eo - matches[num].rm_so;
		    memcpy(dst, src + matches[num].rm_so, len);
		    dst += len;
		}
		
	    }
	    else if (*str == 'x') {
		unsigned char hex1, hex2;
		str++;

		hex1 = toupper(*str++) - '0';
		hex2 = toupper(*str++) - '0';

		if (hex1 > 9) hex1 -= 'A' - '9' - 1;
		if (hex2 > 9) hex2 -= 'A' - '9' - 1;
		*dst++ = (hex1<<4) + hex2;
	    }
	    else
		*dst++ = *str++;
	}
	else
	    *dst++ = *str++;
    }
    *dst = 0;
    return dst - old_dst;
}

static int ishex(char s)
{
    return (s >= '0' && s <= '9') || (s >= 'A' && s <= 'F') || (s >= 'a' && s <= 'f');
}

/* returns NULL if the replacement string <str> is valid, or the pointer to the first error */
char *check_replace_string(char *str)
{
    char *err = NULL;
    while (*str) {
	if (*str == '\\') {
	    err = str; /* in case of a backslash, we return the pointer to it */
	    str++;
	    if (!*str)
		return err;
	    else if (isdigit((int)*str))
		err = NULL;
	    else if (*str == 'x') {
		str++;
		if (!ishex(*str))
		    return err;
		str++;
		if (!ishex(*str))
		    return err;
		err = NULL;
	    }
	    else {
		Warning("'\\%c' : deprecated use of a backslash before something not '\\','x' or a digit.\n", *str);
		err = NULL;
	    }
	}
	str++;
    }
    return err;
}



/*
 * manages the client FSM and its socket. BTW, it also tries to handle the
 * cookie. It returns 1 if a state has changed (and a resync may be needed),
 * 0 else.
 */
int process_cli(struct session *t) {
    int s = t->srv_state;
    int c = t->cli_state;
    struct buffer *req = t->req;
    struct buffer *rep = t->rep;
    int method_checked = 0;
    appsess *asession_temp = NULL;
    appsess local_asession;

#ifdef DEBUG_FULL
    fprintf(stderr,"process_cli: c=%s s=%s set(r,w)=%d,%d exp(r,w)=%d.%d,%d.%d\n",
	    cli_stnames[c], srv_stnames[s],
	    FD_ISSET(t->cli_fd, StaticReadEvent), FD_ISSET(t->cli_fd, StaticWriteEvent),
	    t->crexpire.tv_sec, t->crexpire.tv_usec,
	    t->cwexpire.tv_sec, t->cwexpire.tv_usec);
#endif
    //fprintf(stderr,"process_cli: c=%d, s=%d, cr=%d, cw=%d, sr=%d, sw=%d\n", c, s,
    //FD_ISSET(t->cli_fd, StaticReadEvent), FD_ISSET(t->cli_fd, StaticWriteEvent),
    //FD_ISSET(t->srv_fd, StaticReadEvent), FD_ISSET(t->srv_fd, StaticWriteEvent)
    //);
    if (c == CL_STHEADERS) {
	/* now parse the partial (or complete) headers */
	while (req->lr < req->r) { /* this loop only sees one header at each iteration */
	    char *ptr;
	    int delete_header;
	    char *request_line = NULL;
	
	    ptr = req->lr;

	    /* look for the end of the current header */
	    while (ptr < req->r && *ptr != '\n' && *ptr != '\r')
		ptr++;
	    
	    if (ptr == req->h) { /* empty line, end of headers */
		int line, len;

		/*
		 * first, let's check that it's not a leading empty line, in
		 * which case we'll ignore and remove it (according to RFC2616).
		 */
		if (req->h == req->data) {
		    /* to get a complete header line, we need the ending \r\n, \n\r, \r or \n too */
		    if (ptr > req->r - 2) {
			/* this is a partial header, let's wait for more to come */
			req->lr = ptr;
			break;
		    }

		    /* now we know that *ptr is either \r or \n,
		     * and that there are at least 1 char after it.
		     */
		    if ((ptr[0] == ptr[1]) || (ptr[1] != '\r' && ptr[1] != '\n'))
			req->lr = ptr + 1; /* \r\r, \n\n, \r[^\n], \n[^\r] */
		    else
			req->lr = ptr + 2; /* \r\n or \n\r */
		    /* ignore empty leading lines */
		    buffer_replace2(req, req->h, req->lr, NULL, 0);
		    req->h = req->lr;
		    continue;
		}

		/* we can only get here after an end of headers */
		/* we'll have something else to do here : add new headers ... */

		if (t->flags & SN_CLDENY) {
		    /* no need to go further */
		    t->logs.status = 403;
		    client_retnclose(t, t->proxy->errmsg.len403, t->proxy->errmsg.msg403);
		    if (!(t->flags & SN_ERR_MASK))
			t->flags |= SN_ERR_PRXCOND;
		    if (!(t->flags & SN_FINST_MASK))
			t->flags |= SN_FINST_R;
		    return 1;
		}

		for (line = 0; line < t->proxy->nb_reqadd; line++) {
		    len = sprintf(trash, "%s\r\n", t->proxy->req_add[line]);
		    buffer_replace2(req, req->h, req->h, trash, len);
		}

		if (t->proxy->options & PR_O_FWDFOR) {
		    if (t->cli_addr.ss_family == AF_INET) {
			unsigned char *pn;
			pn = (unsigned char *)&((struct sockaddr_in *)&t->cli_addr)->sin_addr;
			len = sprintf(trash, "X-Forwarded-For: %d.%d.%d.%d\r\n",
				      pn[0], pn[1], pn[2], pn[3]);
			buffer_replace2(req, req->h, req->h, trash, len);
		    }
		    else if (t->cli_addr.ss_family == AF_INET6) {
			char pn[INET6_ADDRSTRLEN];
			inet_ntop(AF_INET6,
				  (const void *)&((struct sockaddr_in6 *)(&t->cli_addr))->sin6_addr,
				  pn, sizeof(pn));
			len = sprintf(trash, "X-Forwarded-For: %s\r\n", pn);
			buffer_replace2(req, req->h, req->h, trash, len);
		    }
		}

		/* add a "connection: close" line if needed */
		if (t->proxy->options & PR_O_HTTP_CLOSE)
		    buffer_replace2(req, req->h, req->h, "Connection: close\r\n", 19);

		if (!memcmp(req->data, "POST ", 5)) {
		    /* this is a POST request, which is not cacheable by default */
		    t->flags |= SN_POST;
		}
		    
		t->cli_state = CL_STDATA;
		req->rlim = req->data + BUFSIZE; /* no more rewrite needed */

		t->logs.t_request = tv_diff(&t->logs.tv_accept, &now);
		/* FIXME: we'll set the client in a wait state while we try to
		 * connect to the server. Is this really needed ? wouldn't it be
		 * better to release the maximum of system buffers instead ?
		 * The solution is to enable the FD but set its time-out to
		 * eternity as long as the server-side does not enable data xfer.
		 * CL_STDATA also has to take care of this, which is done below.
		 */
		//FD_CLR(t->cli_fd, StaticReadEvent);
		//tv_eternity(&t->crexpire);

		/* FIXME: if we break here (as up to 1.1.23), having the client
		 * shutdown its connection can lead to an abort further.
		 * it's better to either return 1 or even jump directly to the
		 * data state which will save one schedule.
		 */
		//break;

		if (!t->proxy->clitimeout ||
		    (t->srv_state < SV_STDATA && t->proxy->srvtimeout))
		    /* If the client has no timeout, or if the server is not ready yet,
		     * and we know for sure that it can expire, then it's cleaner to
		     * disable the timeout on the client side so that too low values
		     * cannot make the sessions abort too early.
		     *
		     * FIXME-20050705: the server needs a way to re-enable this time-out
		     * when it switches its state, otherwise a client can stay connected
		     * indefinitely. This now seems to be OK.
		     */
		    tv_eternity(&t->crexpire);

		goto process_data;
	    }

	    /* to get a complete header line, we need the ending \r\n, \n\r, \r or \n too */
	    if (ptr > req->r - 2) {
		/* this is a partial header, let's wait for more to come */
		req->lr = ptr;
		break;
	    }

	    /* now we know that *ptr is either \r or \n,
	     * and that there are at least 1 char after it.
	     */
	    if ((ptr[0] == ptr[1]) || (ptr[1] != '\r' && ptr[1] != '\n'))
		req->lr = ptr + 1; /* \r\r, \n\n, \r[^\n], \n[^\r] */
	    else
		req->lr = ptr + 2; /* \r\n or \n\r */

	    /*
	     * now we know that we have a full header ; we can do whatever
	     * we want with these pointers :
	     *   req->h  = beginning of header
	     *   ptr     = end of header (first \r or \n)
	     *   req->lr = beginning of next line (next rep->h)
	     *   req->r  = end of data (not used at this stage)
	     */

	    if (!method_checked && (t->proxy->appsession_name != NULL) &&
		((memcmp(req->h, "GET ", 4) == 0) || (memcmp(req->h, "POST ", 4) == 0)) &&
		((request_line = memchr(req->h, ';', req->lr - req->h)) != NULL)) {

	      /* skip ; */
	      request_line++;

	      /* look if we have a jsessionid */

	      if (strncasecmp(request_line, t->proxy->appsession_name, t->proxy->appsession_name_len) == 0) {

		/* skip jsessionid= */
		request_line += t->proxy->appsession_name_len + 1;
		
		/* First try if we allready have an appsession */
		asession_temp = &local_asession;
		
		if ((asession_temp->sessid = pool_alloc_from(apools.sessid, apools.ses_msize)) == NULL) {
		  Alert("Not enough memory process_cli():asession_temp->sessid:calloc().\n");
		  send_log(t->proxy, LOG_ALERT, "Not enough Memory process_cli():asession_temp->sessid:calloc().\n");
		  return 0;
		}

		/* Copy the sessionid */
		memcpy(asession_temp->sessid, request_line, t->proxy->appsession_len);
		asession_temp->sessid[t->proxy->appsession_len] = 0;
		asession_temp->serverid = NULL;

		/* only do insert, if lookup fails */
		if (chtbl_lookup(&(t->proxy->htbl_proxy), (void *)&asession_temp)) {
		  if ((asession_temp = pool_alloc(appsess)) == NULL) {
		    Alert("Not enough memory process_cli():asession:calloc().\n");
		    send_log(t->proxy, LOG_ALERT, "Not enough memory process_cli():asession:calloc().\n");
		    return 0;
		  }
		  asession_temp->sessid = local_asession.sessid;
		  asession_temp->serverid = local_asession.serverid;
		  chtbl_insert(&(t->proxy->htbl_proxy), (void *) asession_temp);
		} /* end if (chtbl_lookup()) */
		else {
		  /*free wasted memory;*/
		  pool_free_to(apools.sessid, local_asession.sessid);
		}

		tv_delayfrom(&asession_temp->expire, &now, t->proxy->appsession_timeout);
		asession_temp->request_count++;
		
#if defined(DEBUG_HASH)
		print_table(&(t->proxy->htbl_proxy));
#endif

		if (asession_temp->serverid == NULL) {
		    Alert("Found Application Session without matching server.\n");
		} else {
		    struct server *srv = t->proxy->srv;
		    while (srv) {
		        if (strcmp(srv->id, asession_temp->serverid) == 0) {
		            if (srv->state & SRV_RUNNING || t->proxy->options & PR_O_PERSIST) {
		                /* we found the server and it's usable */
			        t->flags &= ~SN_CK_MASK;
			        t->flags |= SN_CK_VALID | SN_DIRECT | SN_ASSIGNED;
			        t->srv = srv;
				break;
		            } else {
			        t->flags &= ~SN_CK_MASK;
			        t->flags |= SN_CK_DOWN;
			    }
		        } /* end if (strcmp()) */
		        srv = srv->next;
		    }/* end while(srv) */
		}/* end else of if (asession_temp->serverid == NULL) */
	      }/* end if (strncasecmp(request_line,t->proxy->appsession_name,apssesion_name_len) == 0) */
	      else {
		//fprintf(stderr,">>>>>>>>>>>>>>>>>>>>>>NO SESSION\n");
	      }
	      method_checked = 1;
	    } /* end if (!method_checked ...) */
	    else{
	      //printf("No Methode-Header with Session-String\n");
	    }
	    
	    if (t->logs.logwait & LW_REQ) {
		/* we have a complete HTTP request that we must log */
		int urilen;

		if ((t->logs.uri = pool_alloc(requri)) == NULL) {
		    Alert("HTTP logging : out of memory.\n");
		    t->logs.status = 500;
		    client_retnclose(t, t->proxy->errmsg.len500, t->proxy->errmsg.msg500);
		    if (!(t->flags & SN_ERR_MASK))
			t->flags |= SN_ERR_PRXCOND;
		    if (!(t->flags & SN_FINST_MASK))
			t->flags |= SN_FINST_R;
		    return 1;
		}
		
		urilen = ptr - req->h;
		if (urilen >= REQURI_LEN)
		    urilen = REQURI_LEN - 1;
		memcpy(t->logs.uri, req->h, urilen);
		t->logs.uri[urilen] = 0;

		if (!(t->logs.logwait &= ~LW_REQ))
		    sess_log(t);
	    }
	    else if (t->logs.logwait & LW_REQHDR) {
		struct cap_hdr *h;
		int len;
		for (h = t->proxy->req_cap; h; h = h->next) {
		    if ((h->namelen + 2 <= ptr - req->h) &&
			(req->h[h->namelen] == ':') &&
			(strncasecmp(req->h, h->name, h->namelen) == 0)) {

			if (t->req_cap[h->index] == NULL)
			    t->req_cap[h->index] = pool_alloc_from(h->pool, h->len + 1);

			len = ptr - (req->h + h->namelen + 2);
			if (len > h->len)
			    len = h->len;

			memcpy(t->req_cap[h->index], req->h + h->namelen + 2, len);
			t->req_cap[h->index][len]=0;
		    }
		}
		
	    }

	    delete_header = 0;

	    if ((global.mode & MODE_DEBUG) && (!(global.mode & MODE_QUIET) || (global.mode & MODE_VERBOSE))) {
		int len, max;
		len = sprintf(trash, "%08x:%s.clihdr[%04x:%04x]: ", t->uniq_id, t->proxy->id, (unsigned  short)t->cli_fd, (unsigned short)t->srv_fd);
		max = ptr - req->h;
		UBOUND(max, sizeof(trash) - len - 1);
		len += strlcpy2(trash + len, req->h, max + 1);
		trash[len++] = '\n';
		write(1, trash, len);
	    }


	    /* remove "connection: " if needed */
	    if (!delete_header && (t->proxy->options & PR_O_HTTP_CLOSE)
		&& (strncasecmp(req->h, "Connection: ", 12) == 0)) {
		delete_header = 1;
	    }

	    /* try headers regexps */
	    if (!delete_header && t->proxy->req_exp != NULL
		&& !(t->flags & SN_CLDENY)) {
		struct hdr_exp *exp;
		char term;
		
		term = *ptr;
		*ptr = '\0';
		exp = t->proxy->req_exp;
		do {
		    if (regexec(exp->preg, req->h, MAX_MATCH, pmatch, 0) == 0) {
			switch (exp->action) {
			case ACT_ALLOW:
			    if (!(t->flags & SN_CLDENY))
				t->flags |= SN_CLALLOW;
			    break;
			case ACT_REPLACE:
			    if (!(t->flags & SN_CLDENY)) {
				int len = exp_replace(trash, req->h, exp->replace, pmatch);
				ptr += buffer_replace2(req, req->h, ptr, trash, len);
			    }
			    break;
			case ACT_REMOVE:
			    if (!(t->flags & SN_CLDENY))
				delete_header = 1;
			    break;
			case ACT_DENY:
			    if (!(t->flags & SN_CLALLOW))
				t->flags |= SN_CLDENY;
			    break;
			case ACT_PASS: /* we simply don't deny this one */
			    break;
			}
			break;
		    }
		} while ((exp = exp->next) != NULL);
		*ptr = term; /* restore the string terminator */
	    }
	    
	    /* Now look for cookies. Conforming to RFC2109, we have to support
	     * attributes whose name begin with a '$', and associate them with
	     * the right cookie, if we want to delete this cookie.
	     * So there are 3 cases for each cookie read :
	     * 1) it's a special attribute, beginning with a '$' : ignore it.
	     * 2) it's a server id cookie that we *MAY* want to delete : save
	     *    some pointers on it (last semi-colon, beginning of cookie...)
	     * 3) it's an application cookie : we *MAY* have to delete a previous
	     *    "special" cookie.
	     * At the end of loop, if a "special" cookie remains, we may have to
	     * remove it. If no application cookie persists in the header, we
	     * *MUST* delete it
	     */
	    if (!delete_header &&
		(t->proxy->cookie_name != NULL || t->proxy->capture_name != NULL || t->proxy->appsession_name !=NULL)
		&& !(t->flags & SN_CLDENY) && (ptr >= req->h + 8)
		&& (strncasecmp(req->h, "Cookie: ", 8) == 0)) {
		char *p1, *p2, *p3, *p4;
		char *del_colon, *del_cookie, *colon;
		int app_cookies;

		p1 = req->h + 8; /* first char after 'Cookie: ' */
		colon = p1;
		/* del_cookie == NULL => nothing to be deleted */
		del_colon = del_cookie = NULL;
		app_cookies = 0;
		
		while (p1 < ptr) {
		    /* skip spaces and colons, but keep an eye on these ones */
		    while (p1 < ptr) {
			if (*p1 == ';' || *p1 == ',')
			    colon = p1;
			else if (!isspace((int)*p1))
			    break;
			p1++;
		    }
		    
		    if (p1 == ptr)
			break;
		    
		    /* p1 is at the beginning of the cookie name */
		    p2 = p1;
		    while (p2 < ptr && *p2 != '=')
			p2++;
		    
		    if (p2 == ptr)
			break;

		    p3 = p2 + 1; /* skips the '=' sign */
		    if (p3 == ptr)
			break;
		    
		    p4 = p3;
		    while (p4 < ptr && !isspace((int)*p4) && *p4 != ';' && *p4 != ',')
			p4++;
		    
		    /* here, we have the cookie name between p1 and p2,
		     * and its value between p3 and p4.
		     * we can process it :
		     *
		     * Cookie: NAME=VALUE;
		     * |      ||   ||    |
		     * |      ||   ||    +--> p4
		     * |      ||   |+-------> p3
		     * |      ||   +--------> p2
		     * |      |+------------> p1
		     * |      +-------------> colon
		     * +--------------------> req->h
		     */
		    
		    if (*p1 == '$') {
			/* skip this one */
		    }
		    else {
			/* first, let's see if we want to capture it */
			if (t->proxy->capture_name != NULL &&
			    t->logs.cli_cookie == NULL &&
			    (p4 - p1 >= t->proxy->capture_namelen) &&
			    memcmp(p1, t->proxy->capture_name, t->proxy->capture_namelen) == 0) {
			    int log_len = p4 - p1;

			    if ((t->logs.cli_cookie = pool_alloc(capture)) == NULL) {
				Alert("HTTP logging : out of memory.\n");
			    } else {
				if (log_len > t->proxy->capture_len)
				    log_len = t->proxy->capture_len;
				memcpy(t->logs.cli_cookie, p1, log_len);
				t->logs.cli_cookie[log_len] = 0;
			    }
			}

			if ((p2 - p1 == t->proxy->cookie_len) && (t->proxy->cookie_name != NULL) &&
			    (memcmp(p1, t->proxy->cookie_name, p2 - p1) == 0)) {
			    /* Cool... it's the right one */
			    struct server *srv = t->proxy->srv;
			    char *delim;

			    /* if we're in cookie prefix mode, we'll search the delimitor so that we
			     * have the server ID betweek p3 and delim, and the original cookie between
			     * delim+1 and p4. Otherwise, delim==p4 :
			     *
			     * Cookie: NAME=SRV~VALUE;
			     * |      ||   ||  |     |
			     * |      ||   ||  |     +--> p4
			     * |      ||   ||  +--------> delim
			     * |      ||   |+-----------> p3
			     * |      ||   +------------> p2
			     * |      |+----------------> p1
			     * |      +-----------------> colon
			     * +------------------------> req->h
			     */

			    if (t->proxy->options & PR_O_COOK_PFX) {
				for (delim = p3; delim < p4; delim++)
				    if (*delim == COOKIE_DELIM)
					break;
			    }
			    else
				delim = p4;


			    /* Here, we'll look for the first running server which supports the cookie.
			     * This allows to share a same cookie between several servers, for example
			     * to dedicate backup servers to specific servers only.
			     */
			    while (srv) {
				if ((srv->cklen == delim - p3) && !memcmp(p3, srv->cookie, delim - p3)) {
				    if (srv->state & SRV_RUNNING || t->proxy->options & PR_O_PERSIST) {
					/* we found the server and it's usable */
					t->flags &= ~SN_CK_MASK;
					t->flags |= SN_CK_VALID | SN_DIRECT | SN_ASSIGNED;
					t->srv = srv;
					break;
				    } else {
					/* we found a server, but it's down */
					t->flags &= ~SN_CK_MASK;
					t->flags |= SN_CK_DOWN;
				    }
				}
				srv = srv->next;
			    }

			    if (!srv && !(t->flags & SN_CK_DOWN)) {
				/* no server matched this cookie */
				t->flags &= ~SN_CK_MASK;
				t->flags |= SN_CK_INVALID;
			    }

			    /* depending on the cookie mode, we may have to either :
			     * - delete the complete cookie if we're in insert+indirect mode, so that
			     *   the server never sees it ;
			     * - remove the server id from the cookie value, and tag the cookie as an
			     *   application cookie so that it does not get accidentely removed later,
			     *   if we're in cookie prefix mode
			     */
			    if ((t->proxy->options & PR_O_COOK_PFX) && (delim != p4)) {
				buffer_replace2(req, p3, delim + 1, NULL, 0);
				p4  -= (delim + 1 - p3);
				ptr -= (delim + 1 - p3);
				del_cookie = del_colon = NULL;
				app_cookies++;	/* protect the header from deletion */
			    }
			    else if (del_cookie == NULL &&
				(t->proxy->options & (PR_O_COOK_INS | PR_O_COOK_IND)) == (PR_O_COOK_INS | PR_O_COOK_IND)) {
				del_cookie = p1;
				del_colon = colon;
			    }
			} else {
			    /* now we know that we must keep this cookie since it's
			     * not ours. But if we wanted to delete our cookie
			     * earlier, we cannot remove the complete header, but we
			     * can remove the previous block itself.
			     */
			    app_cookies++;
			    
			    if (del_cookie != NULL) {
				buffer_replace2(req, del_cookie, p1, NULL, 0);
				p4  -= (p1 - del_cookie);
				ptr -= (p1 - del_cookie);
				del_cookie = del_colon = NULL;
			    }
			}
			
			if ((t->proxy->appsession_name != NULL) &&
				  (memcmp(p1, t->proxy->appsession_name, p2 - p1) == 0)) {
			    /* first, let's see if the cookie is our appcookie*/
			    
			    /* Cool... it's the right one */

			    asession_temp = &local_asession;
			  
			    if ((asession_temp->sessid = pool_alloc_from(apools.sessid, apools.ses_msize)) == NULL) {
				Alert("Not enough memory process_cli():asession->sessid:malloc().\n");
				send_log(t->proxy, LOG_ALERT, "Not enough memory process_cli():asession->sessid:malloc().\n");
				return 0;
			    }
			  
			    memcpy(asession_temp->sessid, p3, t->proxy->appsession_len);
			    asession_temp->sessid[t->proxy->appsession_len] = 0;
			    asession_temp->serverid = NULL;
			    
			    /* only do insert, if lookup fails */
			    if (chtbl_lookup(&(t->proxy->htbl_proxy), (void *) &asession_temp) != 0) {
				if ((asession_temp = pool_alloc(appsess)) == NULL) {
				    Alert("Not enough memory process_cli():asession:calloc().\n");
				    send_log(t->proxy, LOG_ALERT, "Not enough memory process_cli():asession:calloc().\n");
				    return 0;
				}
				
				asession_temp->sessid = local_asession.sessid;
				asession_temp->serverid = local_asession.serverid;
				chtbl_insert(&(t->proxy->htbl_proxy), (void *) asession_temp);
			    }
			    else{
				/* free wasted memory */
				pool_free_to(apools.sessid, local_asession.sessid);
			    }
			    
			    if (asession_temp->serverid == NULL) {
				Alert("Found Application Session without matching server.\n");
			    } else {
				struct server *srv = t->proxy->srv;
				while (srv) {
				    if (strcmp(srv->id, asession_temp->serverid) == 0) {
					if (srv->state & SRV_RUNNING || t->proxy->options & PR_O_PERSIST) {
					    /* we found the server and it's usable */
					    t->flags &= ~SN_CK_MASK;
					    t->flags |= SN_CK_VALID | SN_DIRECT | SN_ASSIGNED;
					    t->srv = srv;
					    break;
					} else {
					    t->flags &= ~SN_CK_MASK;
					    t->flags |= SN_CK_DOWN;
					}
				    }
				    srv = srv->next;
				}/* end while(srv) */
			    }/* end else if server == NULL */
			    
			    tv_delayfrom(&asession_temp->expire, &now, t->proxy->appsession_timeout);
			}/* end if ((t->proxy->appsession_name != NULL) ... */
		    }

		    /* we'll have to look for another cookie ... */
		    p1 = p4;
		} /* while (p1 < ptr) */

		/* There's no more cookie on this line.
		 * We may have marked the last one(s) for deletion.
		 * We must do this now in two ways :
		 *  - if there is no app cookie, we simply delete the header ;
		 *  - if there are app cookies, we must delete the end of the
		 *    string properly, including the colon/semi-colon before
		 *    the cookie name.
		 */
		if (del_cookie != NULL) {
		    if (app_cookies) {
			buffer_replace2(req, del_colon, ptr, NULL, 0);
			/* WARNING! <ptr> becomes invalid for now. If some code
			 * below needs to rely on it before the end of the global
			 * header loop, we need to correct it with this code :
			 * ptr = del_colon;
			 */
		    }
		    else
			delete_header = 1;
		}
	    } /* end of cookie processing on this header */

	    /* let's look if we have to delete this header */
	    if (delete_header && !(t->flags & SN_CLDENY)) {
		buffer_replace2(req, req->h, req->lr, NULL, 0);
	    }
	    /* WARNING: ptr is not valid anymore, since the header may have been deleted or truncated ! */

	    req->h = req->lr;
	} /* while (req->lr < req->r) */

	/* end of header processing (even if incomplete) */

	if ((req->l < req->rlim - req->data) && ! FD_ISSET(t->cli_fd, StaticReadEvent)) {
	    /* fd in StaticReadEvent was disabled, perhaps because of a previous buffer
	     * full. We cannot loop here since event_cli_read will disable it only if
	     * req->l == rlim-data
	     */
	    FD_SET(t->cli_fd, StaticReadEvent);
	    if (t->proxy->clitimeout)
		tv_delayfrom(&t->crexpire, &now, t->proxy->clitimeout);
	    else
		tv_eternity(&t->crexpire);
	}

	/* Since we are in header mode, if there's no space left for headers, we
	 * won't be able to free more later, so the session will never terminate.
	 */
	if (req->l >= req->rlim - req->data) {
	    t->logs.status = 400;
	    client_retnclose(t, t->proxy->errmsg.len400, t->proxy->errmsg.msg400);
	    if (!(t->flags & SN_ERR_MASK))
		t->flags |= SN_ERR_PRXCOND;
	    if (!(t->flags & SN_FINST_MASK))
		t->flags |= SN_FINST_R;
	    return 1;
	}
	else if (t->res_cr == RES_ERROR || t->res_cr == RES_NULL) {
	    /* read error, or last read : give up.  */
	    tv_eternity(&t->crexpire);
	    fd_delete(t->cli_fd);
	    t->cli_state = CL_STCLOSE;
	    if (!(t->flags & SN_ERR_MASK))
		t->flags |= SN_ERR_CLICL;
	    if (!(t->flags & SN_FINST_MASK))
		t->flags |= SN_FINST_R;
	    return 1;
	}
	else if (tv_cmp2_ms(&t->crexpire, &now) <= 0) {

	    /* read timeout : give up with an error message.
	     */
	    t->logs.status = 408;
	    client_retnclose(t, t->proxy->errmsg.len408, t->proxy->errmsg.msg408);
	    if (!(t->flags & SN_ERR_MASK))
		t->flags |= SN_ERR_CLITO;
	    if (!(t->flags & SN_FINST_MASK))
		t->flags |= SN_FINST_R;
	    return 1;
	}

	return t->cli_state != CL_STHEADERS;
    }
    else if (c == CL_STDATA) {
    process_data:
	/* FIXME: this error handling is partly buggy because we always report
	 * a 'DATA' phase while we don't know if the server was in IDLE, CONN
	 * or HEADER phase. BTW, it's not logical to expire the client while
	 * we're waiting for the server to connect.
	 */
	/* read or write error */
	if (t->res_cw == RES_ERROR || t->res_cr == RES_ERROR) {
	    tv_eternity(&t->crexpire);
	    tv_eternity(&t->cwexpire);
	    fd_delete(t->cli_fd);
	    t->cli_state = CL_STCLOSE;
	    if (!(t->flags & SN_ERR_MASK))
		t->flags |= SN_ERR_CLICL;
	    if (!(t->flags & SN_FINST_MASK))
		t->flags |= SN_FINST_D;
	    return 1;
	}
	/* last read, or end of server write */
	else if (t->res_cr == RES_NULL || s == SV_STSHUTW || s == SV_STCLOSE) {
	    FD_CLR(t->cli_fd, StaticReadEvent);
	    tv_eternity(&t->crexpire);
	    shutdown(t->cli_fd, SHUT_RD);
	    t->cli_state = CL_STSHUTR;
	    return 1;
	}	
	/* last server read and buffer empty */
	else if ((s == SV_STSHUTR || s == SV_STCLOSE) && (rep->l == 0)) {
	    FD_CLR(t->cli_fd, StaticWriteEvent);
	    tv_eternity(&t->cwexpire);
	    shutdown(t->cli_fd, SHUT_WR);
	    /* We must ensure that the read part is still alive when switching
	     * to shutw */
	    FD_SET(t->cli_fd, StaticReadEvent);
	    if (t->proxy->clitimeout)
		tv_delayfrom(&t->crexpire, &now, t->proxy->clitimeout);
	    t->cli_state = CL_STSHUTW;
	    //fprintf(stderr,"%p:%s(%d), c=%d, s=%d\n", t, __FUNCTION__, __LINE__, t->cli_state, t->cli_state);
	    return 1;
	}
	/* read timeout */
	else if (tv_cmp2_ms(&t->crexpire, &now) <= 0) {
	    FD_CLR(t->cli_fd, StaticReadEvent);
	    tv_eternity(&t->crexpire);
	    shutdown(t->cli_fd, SHUT_RD);
	    t->cli_state = CL_STSHUTR;
	    if (!(t->flags & SN_ERR_MASK))
		t->flags |= SN_ERR_CLITO;
	    if (!(t->flags & SN_FINST_MASK))
		t->flags |= SN_FINST_D;
	    return 1;
	}	
	/* write timeout */
	else if (tv_cmp2_ms(&t->cwexpire, &now) <= 0) {
	    FD_CLR(t->cli_fd, StaticWriteEvent);
	    tv_eternity(&t->cwexpire);
	    shutdown(t->cli_fd, SHUT_WR);
	    /* We must ensure that the read part is still alive when switching
	     * to shutw */
	    FD_SET(t->cli_fd, StaticReadEvent);
	    if (t->proxy->clitimeout)
		tv_delayfrom(&t->crexpire, &now, t->proxy->clitimeout);

	    t->cli_state = CL_STSHUTW;
	    if (!(t->flags & SN_ERR_MASK))
		t->flags |= SN_ERR_CLITO;
	    if (!(t->flags & SN_FINST_MASK))
		t->flags |= SN_FINST_D;
	    return 1;
	}

	if (req->l >= req->rlim - req->data) {
	    /* no room to read more data */
	    if (FD_ISSET(t->cli_fd, StaticReadEvent)) {
		/* stop reading until we get some space */
		FD_CLR(t->cli_fd, StaticReadEvent);
		tv_eternity(&t->crexpire);
	    }
	}
	else {
	    /* there's still some space in the buffer */
	    if (! FD_ISSET(t->cli_fd, StaticReadEvent)) {
		FD_SET(t->cli_fd, StaticReadEvent);
		if (!t->proxy->clitimeout ||
		    (t->srv_state < SV_STDATA && t->proxy->srvtimeout))
		    /* If the client has no timeout, or if the server not ready yet, and we
		     * know for sure that it can expire, then it's cleaner to disable the
		     * timeout on the client side so that too low values cannot make the
		     * sessions abort too early.
		     */
		    tv_eternity(&t->crexpire);
		else
		    tv_delayfrom(&t->crexpire, &now, t->proxy->clitimeout);
	    }
	}

	if ((rep->l == 0) ||
	    ((s < SV_STDATA) /* FIXME: this may be optimized && (rep->w == rep->h)*/)) {
	    if (FD_ISSET(t->cli_fd, StaticWriteEvent)) {
		FD_CLR(t->cli_fd, StaticWriteEvent); /* stop writing */
		tv_eternity(&t->cwexpire);
	    }
	}
	else { /* buffer not empty */
	    if (! FD_ISSET(t->cli_fd, StaticWriteEvent)) {
		FD_SET(t->cli_fd, StaticWriteEvent); /* restart writing */
		if (t->proxy->clitimeout) {
		    tv_delayfrom(&t->cwexpire, &now, t->proxy->clitimeout);
		    /* FIXME: to prevent the client from expiring read timeouts during writes,
		     * we refresh it. */
		    t->crexpire = t->cwexpire;
		}
		else
		    tv_eternity(&t->cwexpire);
	    }
	}
	return 0; /* other cases change nothing */
    }
    else if (c == CL_STSHUTR) {
	if (t->res_cw == RES_ERROR) {
	    tv_eternity(&t->cwexpire);
	    fd_delete(t->cli_fd);
	    t->cli_state = CL_STCLOSE;
	    if (!(t->flags & SN_ERR_MASK))
		t->flags |= SN_ERR_CLICL;
	    if (!(t->flags & SN_FINST_MASK))
		t->flags |= SN_FINST_D;
	    return 1;
	}
	else if ((s == SV_STSHUTR || s == SV_STCLOSE) && (rep->l == 0)) {
	    tv_eternity(&t->cwexpire);
	    fd_delete(t->cli_fd);
	    t->cli_state = CL_STCLOSE;
	    return 1;
	}
	else if (tv_cmp2_ms(&t->cwexpire, &now) <= 0) {
	    tv_eternity(&t->cwexpire);
	    fd_delete(t->cli_fd);
	    t->cli_state = CL_STCLOSE;
	    if (!(t->flags & SN_ERR_MASK))
		t->flags |= SN_ERR_CLITO;
	    if (!(t->flags & SN_FINST_MASK))
		t->flags |= SN_FINST_D;
	    return 1;
	}
	else if ((rep->l == 0) ||
		 ((s == SV_STHEADERS) /* FIXME: this may be optimized && (rep->w == rep->h)*/)) {
	    if (FD_ISSET(t->cli_fd, StaticWriteEvent)) {
		FD_CLR(t->cli_fd, StaticWriteEvent); /* stop writing */
		tv_eternity(&t->cwexpire);
	    }
	}
	else { /* buffer not empty */
	    if (! FD_ISSET(t->cli_fd, StaticWriteEvent)) {
		FD_SET(t->cli_fd, StaticWriteEvent); /* restart writing */
		if (t->proxy->clitimeout) {
		    tv_delayfrom(&t->cwexpire, &now, t->proxy->clitimeout);
		    /* FIXME: to prevent the client from expiring read timeouts during writes,
		     * we refresh it. */
		    t->crexpire = t->cwexpire;
		}
		else
		    tv_eternity(&t->cwexpire);
	    }
	}
	return 0;
    }
    else if (c == CL_STSHUTW) {
	if (t->res_cr == RES_ERROR) {
	    tv_eternity(&t->crexpire);
	    fd_delete(t->cli_fd);
	    t->cli_state = CL_STCLOSE;
	    if (!(t->flags & SN_ERR_MASK))
		t->flags |= SN_ERR_CLICL;
	    if (!(t->flags & SN_FINST_MASK))
		t->flags |= SN_FINST_D;
	    return 1;
	}
	else if (t->res_cr == RES_NULL || s == SV_STSHUTW || s == SV_STCLOSE) {
	    tv_eternity(&t->crexpire);
	    fd_delete(t->cli_fd);
	    t->cli_state = CL_STCLOSE;
	    return 1;
	}
	else if (tv_cmp2_ms(&t->crexpire, &now) <= 0) {
	    tv_eternity(&t->crexpire);
	    fd_delete(t->cli_fd);
	    t->cli_state = CL_STCLOSE;
	    if (!(t->flags & SN_ERR_MASK))
		t->flags |= SN_ERR_CLITO;
	    if (!(t->flags & SN_FINST_MASK))
		t->flags |= SN_FINST_D;
	    return 1;
	}
	else if (req->l >= req->rlim - req->data) {
	    /* no room to read more data */

	    /* FIXME-20050705: is it possible for a client to maintain a session
	     * after the timeout by sending more data after it receives a close ?
	     */

	    if (FD_ISSET(t->cli_fd, StaticReadEvent)) {
		/* stop reading until we get some space */
		FD_CLR(t->cli_fd, StaticReadEvent);
		tv_eternity(&t->crexpire);
		//fprintf(stderr,"%p:%s(%d), c=%d, s=%d\n", t, __FUNCTION__, __LINE__, t->cli_state, t->cli_state);
	    }
	}
	else {
	    /* there's still some space in the buffer */
	    if (! FD_ISSET(t->cli_fd, StaticReadEvent)) {
		FD_SET(t->cli_fd, StaticReadEvent);
		if (t->proxy->clitimeout)
		    tv_delayfrom(&t->crexpire, &now, t->proxy->clitimeout);
		else
		    tv_eternity(&t->crexpire);
		//fprintf(stderr,"%p:%s(%d), c=%d, s=%d\n", t, __FUNCTION__, __LINE__, t->cli_state, t->cli_state);
	    }
	}
	return 0;
    }
    else { /* CL_STCLOSE: nothing to do */
	if ((global.mode & MODE_DEBUG) && (!(global.mode & MODE_QUIET) || (global.mode & MODE_VERBOSE))) {
	    int len;
	    len = sprintf(trash, "%08x:%s.clicls[%04x:%04x]\n", t->uniq_id, t->proxy->id, (unsigned short)t->cli_fd, (unsigned short)t->srv_fd);
	    write(1, trash, len);
	}
	return 0;
    }
    return 0;
}

/* This function turns the server state into the SV_STCLOSE, and sets
 * indicators accordingly. Note that if <status> is 0, no message is
 * returned.
 */
void srv_close_with_err(struct session *t, int err, int finst, int status, int msglen, char *msg) {
    t->srv_state = SV_STCLOSE;
    if (status > 0) {
	t->logs.status = status;
	if (t->proxy->mode == PR_MODE_HTTP)
	    client_return(t, msglen, msg);
    }
    if (!(t->flags & SN_ERR_MASK))
	t->flags |= err;
    if (!(t->flags & SN_FINST_MASK))
	t->flags |= finst;
}

/*
 * This function checks the retry count during the connect() job.
 * It updates the session's srv_state and retries, so that the caller knows
 * what it has to do. It uses the last connection error to set the log when
 * it expires. It returns 1 when it has expired, and 0 otherwise.
 */
int srv_count_retry_down(struct session *t, int conn_err) {
    /* we are in front of a retryable error */
    t->conn_retries--;
    if (t->conn_retries < 0) {
	/* if not retryable anymore, let's abort */
	tv_eternity(&t->cnexpire);
	srv_close_with_err(t, conn_err, SN_FINST_C,
			   503, t->proxy->errmsg.len503, t->proxy->errmsg.msg503);
	    
	/* We used to have a free connection slot. Since we'll never use it,
	 * we have to pass it on to another session.
	 */
	if (t->srv)
	    offer_connection_slot(t);
	return 1;
    }
    return 0;
}

/*
 * This function performs the retryable part of the connect() job.
 * It updates the session's srv_state and retries, so that the caller knows
 * what it has to do. It returns 1 when it breaks out of the loop, or 0 if
 * it needs to redispatch.
 */
int srv_retryable_connect(struct session *t) {
    int conn_err;

    /* This loop ensures that we stop before the last retry in case of a
     * redispatchable server.
     */
    do {
	/* initiate a connection to the server */
	conn_err = connect_server(t);
	switch (conn_err) {
	
	case SN_ERR_NONE:
	    //fprintf(stderr,"0: c=%d, s=%d\n", c, s);
	    t->srv_state = SV_STCONN;
	    return 1;
	    
	case SN_ERR_INTERNAL:
	    tv_eternity(&t->cnexpire);
	    srv_close_with_err(t, SN_ERR_INTERNAL, SN_FINST_C,
			       500, t->proxy->errmsg.len500, t->proxy->errmsg.msg500);
	    /* release other sessions waiting for this server */
	    if (t->srv)
		offer_connection_slot(t);
	    return 1;
	}
	/* ensure that we have enough retries left */
	if (srv_count_retry_down(t, conn_err))
	    return 1;
    } while (t->srv == NULL || t->conn_retries > 0 || !(t->proxy->options & PR_O_REDISP));

    /* We're on our last chance, and the REDISP option was specified.
     * We will ignore cookie and force to balance or use the dispatcher.
     */
    t->flags &= ~(SN_DIRECT | SN_ASSIGNED | SN_ADDR_SET);
    t->srv = NULL; /* it's left to the dispatcher to choose a server */
    if ((t->flags & SN_CK_MASK) == SN_CK_VALID) {
	t->flags &= ~SN_CK_MASK;
	t->flags |= SN_CK_DOWN;
    }
    return 0;
}

/* This function performs the "redispatch" part of a connection attempt. It
 * will assign a server if required, queue the connection if required, and
 * handle errors that might arise at this level. It can change the server
 * state. It will return 1 if it encounters an error, switches the server
 * state, or has to queue a connection. Otherwise, it will return 0 indicating
 * that the connection is ready to use.
 */

int srv_redispatch_connect(struct session *t) {
    int conn_err;

    /* We know that we don't have any connection pending, so we will
     * try to get a new one, and wait in this state if it's queued
     */
    conn_err = assign_server_and_queue(t);
    switch (conn_err) {
    case SRV_STATUS_OK:
	break;

    case SRV_STATUS_NOSRV:
	tv_eternity(&t->cnexpire);
	srv_close_with_err(t, SN_ERR_SRVTO, SN_FINST_C,
			   503, t->proxy->errmsg.len503, t->proxy->errmsg.msg503);

	/* FIXME-20060501: we should not need this once we flush every session
	 * when the last server goes down.
	 */
	/* release other sessions waiting for this server */
	if (t->srv)
	    offer_connection_slot(t);
	return 1;

    case SRV_STATUS_QUEUED:
	t->srv_state = SV_STIDLE;
	/* do nothing else and do not wake any other session up */
	return 1;

    case SRV_STATUS_FULL:
    case SRV_STATUS_INTERNAL:
    default:
	tv_eternity(&t->cnexpire);
	srv_close_with_err(t, SN_ERR_INTERNAL, SN_FINST_C,
			   500, t->proxy->errmsg.len500, t->proxy->errmsg.msg500);
	/* release other sessions waiting for this server */
	if (t->srv)
	    offer_connection_slot(t);
	return 1;
    }
    /* if we get here, it's because we got SRV_STATUS_OK, which also
     * means that the connection has not been queued.
     */
    return 0;
}


/*
 * manages the server FSM and its socket. It returns 1 if a state has changed
 * (and a resync may be needed), 0 else.
 */
int process_srv(struct session *t) {
    int s = t->srv_state;
    int c = t->cli_state;
    struct buffer *req = t->req;
    struct buffer *rep = t->rep;
    appsess *asession_temp = NULL;
    appsess local_asession;
    int conn_err;

#ifdef DEBUG_FULL
    fprintf(stderr,"process_srv: c=%s, s=%s\n", cli_stnames[c], srv_stnames[s]);
#endif
    //fprintf(stderr,"process_srv: c=%d, s=%d, cr=%d, cw=%d, sr=%d, sw=%d\n", c, s,
    //FD_ISSET(t->cli_fd, StaticReadEvent), FD_ISSET(t->cli_fd, StaticWriteEvent),
    //FD_ISSET(t->srv_fd, StaticReadEvent), FD_ISSET(t->srv_fd, StaticWriteEvent)
    //);
    if (s == SV_STIDLE) {
	if (c == CL_STHEADERS)
	    return 0;	/* stay in idle, waiting for data to reach the client side */
	else if (c == CL_STCLOSE ||
		 c == CL_STSHUTW ||
		 (c == CL_STSHUTR && t->req->l == 0)) { /* give up */
	    tv_eternity(&t->cnexpire);
	    srv_close_with_err(t, SN_ERR_CLICL, SN_FINST_C, 0, 0, NULL);

	    /* it might be possible that we have been granted an access to the
	     * server while waiting for a free slot. Since we'll never use it,
	     * we have to pass it on to another session.
	     */
	    if (t->srv)
		offer_connection_slot(t);
	    return 1;
	}
	else {
	    /* Right now, we will need to create a connection to the server.
	     * We might already have tried, and got a connection pending, in
	     * which case we will not do anything till it's pending. It's up
	     * to any other session to release it and wake us up again.
	     */
	    if (t->pend_pos)
		return 0;

	    do {
		/* first, get a connection */
		if (srv_redispatch_connect(t))
		    return t->srv_state != SV_STIDLE;

		/* try to (re-)connect to the server, and fail if we expire the
		 * number of retries.
		 */
		if (srv_retryable_connect(t)) {
		    t->logs.t_queue = tv_diff(&t->logs.tv_accept, &now);
		    return t->srv_state != SV_STIDLE;
		}

	    } while (1);
	}
    }
    else if (s == SV_STCONN) { /* connection in progress */
	if (t->res_sw == RES_SILENT && tv_cmp2_ms(&t->cnexpire, &now) > 0) {
	    //fprintf(stderr,"1: c=%d, s=%d, now=%d.%06d, exp=%d.%06d\n", c, s, now.tv_sec, now.tv_usec, t->cnexpire.tv_sec, t->cnexpire.tv_usec);
	    return 0; /* nothing changed */
	}
	else if (t->res_sw == RES_SILENT || t->res_sw == RES_ERROR) {
	    /* timeout, asynchronous connect error or first write error */
	    //fprintf(stderr,"2: c=%d, s=%d\n", c, s);

	    fd_delete(t->srv_fd);
	    if (t->srv)
		t->srv->cur_sess--;

	    if (t->res_sw == RES_SILENT)
		conn_err = SN_ERR_SRVTO; // it was a connect timeout.
	    else
		conn_err = SN_ERR_SRVCL; // it was an asynchronous connect error.

	    /* ensure that we have enough retries left */
	    if (srv_count_retry_down(t, conn_err))
		return 1;

	    do {
		/* Now we will try to either reconnect to the same server or
		 * connect to another server. If the connection gets queued
		 * because all servers are saturated, then we will go back to
		 * the SV_STIDLE state.
		 */
		if (srv_retryable_connect(t)) {
		    t->logs.t_queue = tv_diff(&t->logs.tv_accept, &now);
		    return t->srv_state != SV_STCONN;
		}

		/* we need to redispatch the connection to another server */
		if (srv_redispatch_connect(t))
		    return t->srv_state != SV_STCONN;
	    } while (1);
	}
	else { /* no error or write 0 */
	    t->logs.t_connect = tv_diff(&t->logs.tv_accept, &now);

	    //fprintf(stderr,"3: c=%d, s=%d\n", c, s);
	    if (req->l == 0) /* nothing to write */ {
		FD_CLR(t->srv_fd, StaticWriteEvent);
		tv_eternity(&t->swexpire);
	    } else  /* need the right to write */ {
		FD_SET(t->srv_fd, StaticWriteEvent);
		if (t->proxy->srvtimeout) {
		    tv_delayfrom(&t->swexpire, &now, t->proxy->srvtimeout);
		    /* FIXME: to prevent the server from expiring read timeouts during writes,
		     * we refresh it. */
		    t->srexpire = t->swexpire;
		}
		else
		    tv_eternity(&t->swexpire);
	    }

	    if (t->proxy->mode == PR_MODE_TCP) { /* let's allow immediate data connection in this case */
		FD_SET(t->srv_fd, StaticReadEvent);
		if (t->proxy->srvtimeout)
		    tv_delayfrom(&t->srexpire, &now, t->proxy->srvtimeout);
		else
		    tv_eternity(&t->srexpire);
		
		t->srv_state = SV_STDATA;
		t->srv->cum_sess++;
		rep->rlim = rep->data + BUFSIZE; /* no rewrite needed */

		/* if the user wants to log as soon as possible, without counting
		   bytes from the server, then this is the right moment. */
		if (t->proxy->to_log && !(t->logs.logwait & LW_BYTES)) {
		    t->logs.t_close = t->logs.t_connect; /* to get a valid end date */
		    sess_log(t);
		}
	    }
	    else {
		t->srv_state = SV_STHEADERS;
		t->srv->cum_sess++;
		rep->rlim = rep->data + BUFSIZE - MAXREWRITE; /* rewrite needed */
	    }
	    tv_eternity(&t->cnexpire);
	    return 1;
	}
    }
    else if (s == SV_STHEADERS) { /* receiving server headers */
	/* now parse the partial (or complete) headers */
	while (rep->lr < rep->r) { /* this loop only sees one header at each iteration */
	    char *ptr;
	    int delete_header;

	    ptr = rep->lr;

	    /* look for the end of the current header */
	    while (ptr < rep->r && *ptr != '\n' && *ptr != '\r')
		ptr++;
	    
	    if (ptr == rep->h) {
		int line, len;

		/* we can only get here after an end of headers */

		/* first, we'll block if security checks have caught nasty things */
		if (t->flags & SN_CACHEABLE) {
		    if ((t->flags & SN_CACHE_COOK) &&
			(t->flags & SN_SCK_ANY) &&
			(t->proxy->options & PR_O_CHK_CACHE)) {

			/* we're in presence of a cacheable response containing
			 * a set-cookie header. We'll block it as requested by
			 * the 'checkcache' option, and send an alert.
			 */
			tv_eternity(&t->srexpire);
			tv_eternity(&t->swexpire);
			fd_delete(t->srv_fd);
			if (t->srv)
			    t->srv->cur_sess--;
			t->srv_state = SV_STCLOSE;
			t->logs.status = 502;
			client_return(t, t->proxy->errmsg.len502, t->proxy->errmsg.msg502);
			if (!(t->flags & SN_ERR_MASK))
			    t->flags |= SN_ERR_PRXCOND;
			if (!(t->flags & SN_FINST_MASK))
			    t->flags |= SN_FINST_H;

			Alert("Blocking cacheable cookie in response from instance %s, server %s.\n", t->proxy->id, t->srv->id);
			send_log(t->proxy, LOG_ALERT, "Blocking cacheable cookie in response from instance %s, server %s.\n", t->proxy->id, t->srv->id);

			/* We used to have a free connection slot. Since we'll never use it,
			 * we have to pass it on to another session.
			 */
			if (t->srv)
			    offer_connection_slot(t);

			return 1;
		    }
		}

		/* next, we'll block if an 'rspideny' or 'rspdeny' filter matched */
		if (t->flags & SN_SVDENY) {
		    tv_eternity(&t->srexpire);
		    tv_eternity(&t->swexpire);
		    fd_delete(t->srv_fd);
		    if (t->srv)
			t->srv->cur_sess--;
		    t->srv_state = SV_STCLOSE;
		    t->logs.status = 502;
		    client_return(t, t->proxy->errmsg.len502, t->proxy->errmsg.msg502);
		    if (!(t->flags & SN_ERR_MASK))
			t->flags |= SN_ERR_PRXCOND;
		    if (!(t->flags & SN_FINST_MASK))
			t->flags |= SN_FINST_H;
		    /* We used to have a free connection slot. Since we'll never use it,
		     * we have to pass it on to another session.
		     */
		    if (t->srv)
			offer_connection_slot(t);

		    return 1;
		}

		/* we'll have something else to do here : add new headers ... */

		if ((t->srv) && !(t->flags & SN_DIRECT) && (t->proxy->options & PR_O_COOK_INS) &&
		    (!(t->proxy->options & PR_O_COOK_POST) || (t->flags & SN_POST))) {
		    /* the server is known, it's not the one the client requested, we have to
		     * insert a set-cookie here, except if we want to insert only on POST
		     * requests and this one isn't.
		     */
		    len = sprintf(trash, "Set-Cookie: %s=%s; path=/\r\n",
				  t->proxy->cookie_name,
				  t->srv->cookie ? t->srv->cookie : "");

		    t->flags |= SN_SCK_INSERTED;

		    /* Here, we will tell an eventual cache on the client side that we don't
		     * want it to cache this reply because HTTP/1.0 caches also cache cookies !
		     * Some caches understand the correct form: 'no-cache="set-cookie"', but
		     * others don't (eg: apache <= 1.3.26). So we use 'private' instead.
		     */
		    if (t->proxy->options & PR_O_COOK_NOC)
			//len += sprintf(newhdr + len, "Cache-control: no-cache=\"set-cookie\"\r\n");
			len += sprintf(trash + len, "Cache-control: private\r\n");

		    if (rep->data + rep->l < rep->h)
			/* The data has been stolen, we will crash cleanly instead of corrupting memory */
			*(int *)0 = 0;
		    buffer_replace2(rep, rep->h, rep->h, trash, len);
		}

		/* headers to be added */
		for (line = 0; line < t->proxy->nb_rspadd; line++) {
		    len = sprintf(trash, "%s\r\n", t->proxy->rsp_add[line]);
		    buffer_replace2(rep, rep->h, rep->h, trash, len);
		}

		/* add a "connection: close" line if needed */
		if (t->proxy->options & PR_O_HTTP_CLOSE)
		    buffer_replace2(rep, rep->h, rep->h, "Connection: close\r\n", 19);

		t->srv_state = SV_STDATA;
		rep->rlim = rep->data + BUFSIZE; /* no more rewrite needed */
		t->logs.t_data = tv_diff(&t->logs.tv_accept, &now);

		/* client connection already closed or option 'httpclose' required :
		 * we close the server's outgoing connection right now.
		 */
		if ((req->l == 0) &&
		    (c == CL_STSHUTR || c == CL_STCLOSE || t->proxy->options & PR_O_FORCE_CLO)) {
		    FD_CLR(t->srv_fd, StaticWriteEvent);
		    tv_eternity(&t->swexpire);

		    /* We must ensure that the read part is still alive when switching
		     * to shutw */
		    FD_SET(t->srv_fd, StaticReadEvent);
		    if (t->proxy->srvtimeout)
			tv_delayfrom(&t->srexpire, &now, t->proxy->srvtimeout);

		    shutdown(t->srv_fd, SHUT_WR);
		    t->srv_state = SV_STSHUTW;
		}

		/* if the user wants to log as soon as possible, without counting
		   bytes from the server, then this is the right moment. */
		if (t->proxy->to_log && !(t->logs.logwait & LW_BYTES)) {
		    t->logs.t_close = t->logs.t_data; /* to get a valid end date */
		    t->logs.bytes = rep->h - rep->data;
		    sess_log(t);
		}
		break;
	    }

	    /* to get a complete header line, we need the ending \r\n, \n\r, \r or \n too */
	    if (ptr > rep->r - 2) {
		/* this is a partial header, let's wait for more to come */
		rep->lr = ptr;
		break;
	    }

	    //	    fprintf(stderr,"h=%p, ptr=%p, lr=%p, r=%p, *h=", rep->h, ptr, rep->lr, rep->r);
	    //	    write(2, rep->h, ptr - rep->h);   fprintf(stderr,"\n");

	    /* now we know that *ptr is either \r or \n,
	     * and that there are at least 1 char after it.
	     */
	    if ((ptr[0] == ptr[1]) || (ptr[1] != '\r' && ptr[1] != '\n'))
		rep->lr = ptr + 1; /* \r\r, \n\n, \r[^\n], \n[^\r] */
	    else
		rep->lr = ptr + 2; /* \r\n or \n\r */

	    /*
	     * now we know that we have a full header ; we can do whatever
	     * we want with these pointers :
	     *   rep->h  = beginning of header
	     *   ptr     = end of header (first \r or \n)
	     *   rep->lr = beginning of next line (next rep->h)
	     *   rep->r  = end of data (not used at this stage)
	     */


	    if (t->logs.status == -1) {
		t->logs.logwait &= ~LW_RESP;
		t->logs.status = atoi(rep->h + 9);
		switch (t->logs.status) {
		    case 200:
		    case 203:
		    case 206:
		    case 300:
		    case 301:
		    case 410:
			/* RFC2616 @13.4:
			 *   "A response received with a status code of
			 *    200, 203, 206, 300, 301 or 410 MAY be stored
			 *    by a cache (...) unless a cache-control
			 *    directive prohibits caching."
			 *   
			 * RFC2616 @9.5: POST method :
			 *   "Responses to this method are not cacheable,
			 *    unless the response includes appropriate
			 *    Cache-Control or Expires header fields."
			 */
			if ((!t->flags & SN_POST) && (t->proxy->options & PR_O_CHK_CACHE))
				t->flags |= SN_CACHEABLE | SN_CACHE_COOK;
			break;
		    default:
			break;
		}
	    }
	    else if (t->logs.logwait & LW_RSPHDR) {
		struct cap_hdr *h;
		int len;
		for (h = t->proxy->rsp_cap; h; h = h->next) {
		    if ((h->namelen + 2 <= ptr - rep->h) &&
			(rep->h[h->namelen] == ':') &&
			(strncasecmp(rep->h, h->name, h->namelen) == 0)) {

			if (t->rsp_cap[h->index] == NULL)
			    t->rsp_cap[h->index] = pool_alloc_from(h->pool, h->len + 1);

			len = ptr - (rep->h + h->namelen + 2);
			if (len > h->len)
			    len = h->len;

			memcpy(t->rsp_cap[h->index], rep->h + h->namelen + 2, len);
			t->rsp_cap[h->index][len]=0;
		    }
		}
		
	    }

	    delete_header = 0;

	    if ((global.mode & MODE_DEBUG) && (!(global.mode & MODE_QUIET) || (global.mode & MODE_VERBOSE))) {
		int len, max;
		len = sprintf(trash, "%08x:%s.srvhdr[%04x:%04x]: ", t->uniq_id, t->proxy->id, (unsigned  short)t->cli_fd, (unsigned short)t->srv_fd);
		max = ptr - rep->h;
		UBOUND(max, sizeof(trash) - len - 1);
		len += strlcpy2(trash + len, rep->h, max + 1);
		trash[len++] = '\n';
		write(1, trash, len);
	    }

	    /* remove "connection: " if needed */
	    if (!delete_header && (t->proxy->options & PR_O_HTTP_CLOSE)
		&& (strncasecmp(rep->h, "Connection: ", 12) == 0)) {
		delete_header = 1;
	    }

	    /* try headers regexps */
	    if (!delete_header && t->proxy->rsp_exp != NULL
		&& !(t->flags & SN_SVDENY)) {
		struct hdr_exp *exp;
		char term;
		
		term = *ptr;
		*ptr = '\0';
		exp = t->proxy->rsp_exp;
		do {
		    if (regexec(exp->preg, rep->h, MAX_MATCH, pmatch, 0) == 0) {
			switch (exp->action) {
			case ACT_ALLOW:
			    if (!(t->flags & SN_SVDENY))
				t->flags |= SN_SVALLOW;
			    break;
			case ACT_REPLACE:
			    if (!(t->flags & SN_SVDENY)) {
				int len = exp_replace(trash, rep->h, exp->replace, pmatch);
				ptr += buffer_replace2(rep, rep->h, ptr, trash, len);
			    }
			    break;
			case ACT_REMOVE:
			    if (!(t->flags & SN_SVDENY))
				delete_header = 1;
			    break;
			case ACT_DENY:
			    if (!(t->flags & SN_SVALLOW))
				t->flags |= SN_SVDENY;
			    break;
			case ACT_PASS: /* we simply don't deny this one */
			    break;
			}
			break;
		    }
		} while ((exp = exp->next) != NULL);
		*ptr = term; /* restore the string terminator */
	    }
	    
	    /* check for cache-control: or pragma: headers */
	    if (!delete_header && (t->flags & SN_CACHEABLE)) {
		if (strncasecmp(rep->h, "Pragma: no-cache", 16) == 0)
		    t->flags &= ~SN_CACHEABLE & ~SN_CACHE_COOK;
		else if (strncasecmp(rep->h, "Cache-control: ", 15) == 0) {
		    if (strncasecmp(rep->h + 15, "no-cache", 8) == 0) {
			if (rep->h + 23 == ptr || rep->h[23] == ',')
			    t->flags &= ~SN_CACHEABLE & ~SN_CACHE_COOK;
			else {
			    if (strncasecmp(rep->h + 23, "=\"set-cookie", 12) == 0
				&& (rep->h[35] == '"' || rep->h[35] == ','))
				t->flags &= ~SN_CACHE_COOK;
			}
		    } else if ((strncasecmp(rep->h + 15, "private", 7) == 0 &&
				(rep->h + 22 == ptr || rep->h[22] == ','))
			       || (strncasecmp(rep->h + 15, "no-store", 8) == 0 &&
				   (rep->h + 23 == ptr || rep->h[23] == ','))) {
			t->flags &= ~SN_CACHEABLE & ~SN_CACHE_COOK;
		    } else if (strncasecmp(rep->h + 15, "max-age=0", 9) == 0 &&
			       (rep->h + 24 == ptr || rep->h[24] == ',')) {
			t->flags &= ~SN_CACHEABLE & ~SN_CACHE_COOK;
		    } else if (strncasecmp(rep->h + 15, "s-maxage=0", 10) == 0 &&
			       (rep->h + 25 == ptr || rep->h[25] == ',')) {
			t->flags &= ~SN_CACHEABLE & ~SN_CACHE_COOK;
		    } else if (strncasecmp(rep->h + 15, "public", 6) == 0 &&
			       (rep->h + 21 == ptr || rep->h[21] == ',')) {
			t->flags |= SN_CACHEABLE | SN_CACHE_COOK;
		    }
		}
	    }

	    /* check for server cookies */
	    if (!delete_header /*&& (t->proxy->options & PR_O_COOK_ANY)*/
		&& (t->proxy->cookie_name != NULL || t->proxy->capture_name != NULL || t->proxy->appsession_name !=NULL)
		&& (strncasecmp(rep->h, "Set-Cookie: ", 12) == 0)) {
		char *p1, *p2, *p3, *p4;
		
		t->flags |= SN_SCK_ANY;

		p1 = rep->h + 12; /* first char after 'Set-Cookie: ' */
		
		while (p1 < ptr) { /* in fact, we'll break after the first cookie */
		    while (p1 < ptr && (isspace((int)*p1)))
			p1++;
		    
		    if (p1 == ptr || *p1 == ';') /* end of cookie */
			break;
		    
		    /* p1 is at the beginning of the cookie name */
		    p2 = p1;
		    
		    while (p2 < ptr && *p2 != '=' && *p2 != ';')
			p2++;
		    
		    if (p2 == ptr || *p2 == ';') /* next cookie */
			break;
		    
		    p3 = p2 + 1; /* skips the '=' sign */
		    if (p3 == ptr)
			break;
		    
		    p4 = p3;
		    while (p4 < ptr && !isspace((int)*p4) && *p4 != ';')
			p4++;
		    
		    /* here, we have the cookie name between p1 and p2,
		     * and its value between p3 and p4.
		     * we can process it.
		     */

		    /* first, let's see if we want to capture it */
		    if (t->proxy->capture_name != NULL &&
			t->logs.srv_cookie == NULL &&
			(p4 - p1 >= t->proxy->capture_namelen) &&
			memcmp(p1, t->proxy->capture_name, t->proxy->capture_namelen) == 0) {
			int log_len = p4 - p1;

			if ((t->logs.srv_cookie = pool_alloc(capture)) == NULL) {
			    Alert("HTTP logging : out of memory.\n");
			}

			if (log_len > t->proxy->capture_len)
			    log_len = t->proxy->capture_len;
			memcpy(t->logs.srv_cookie, p1, log_len);
			t->logs.srv_cookie[log_len] = 0;
		    }

		    if ((p2 - p1 == t->proxy->cookie_len) && (t->proxy->cookie_name != NULL) &&
			(memcmp(p1, t->proxy->cookie_name, p2 - p1) == 0)) {
			/* Cool... it's the right one */
			t->flags |= SN_SCK_SEEN;
			
			/* If the cookie is in insert mode on a known server, we'll delete
			 * this occurrence because we'll insert another one later.
			 * We'll delete it too if the "indirect" option is set and we're in
			 * a direct access. */
			if (((t->srv) && (t->proxy->options & PR_O_COOK_INS)) ||
			    ((t->flags & SN_DIRECT) && (t->proxy->options & PR_O_COOK_IND))) {
			    /* this header must be deleted */
			    delete_header = 1;
			    t->flags |= SN_SCK_DELETED;
			}
			else if ((t->srv) && (t->proxy->options & PR_O_COOK_RW)) {
			    /* replace bytes p3->p4 with the cookie name associated
			     * with this server since we know it.
			     */
			    buffer_replace2(rep, p3, p4, t->srv->cookie, t->srv->cklen);
			    t->flags |= SN_SCK_INSERTED | SN_SCK_DELETED;
			}
			else if ((t->srv) && (t->proxy->options & PR_O_COOK_PFX)) {
			    /* insert the cookie name associated with this server
			     * before existing cookie, and insert a delimitor between them..
			     */
			    buffer_replace2(rep, p3, p3, t->srv->cookie, t->srv->cklen + 1);
			    p3[t->srv->cklen] = COOKIE_DELIM;
			    t->flags |= SN_SCK_INSERTED | SN_SCK_DELETED;
			}
			break;
		    }

		    /* first, let's see if the cookie is our appcookie*/
		    if ((t->proxy->appsession_name != NULL) &&
			(memcmp(p1, t->proxy->appsession_name, p2 - p1) == 0)) {

		      /* Cool... it's the right one */

		      size_t server_id_len = strlen(t->srv->id) + 1;
		      asession_temp = &local_asession;
		      
		      if ((asession_temp->sessid = pool_alloc_from(apools.sessid, apools.ses_msize)) == NULL) {
			Alert("Not enought Memory process_srv():asession->sessid:malloc().\n");
			send_log(t->proxy, LOG_ALERT, "Not enought Memory process_srv():asession->sessid:malloc().\n");
		      }
		      memcpy(asession_temp->sessid, p3, t->proxy->appsession_len);
		      asession_temp->sessid[t->proxy->appsession_len] = 0;
		      asession_temp->serverid = NULL;

		      /* only do insert, if lookup fails */
		      if (chtbl_lookup(&(t->proxy->htbl_proxy), (void *) &asession_temp) != 0) {
	                  if ((asession_temp = pool_alloc(appsess)) == NULL) {
		              Alert("Not enought Memory process_srv():asession:calloc().\n");
		              send_log(t->proxy, LOG_ALERT, "Not enought Memory process_srv():asession:calloc().\n");
            	              return 0;
                          }
			  asession_temp->sessid = local_asession.sessid;
			  asession_temp->serverid = local_asession.serverid;
			  chtbl_insert(&(t->proxy->htbl_proxy), (void *) asession_temp);
		      }/* end if (chtbl_lookup()) */
		      else {
		      	/* free wasted memory */
		      	pool_free_to(apools.sessid, local_asession.sessid);
		      } /* end else from if (chtbl_lookup()) */
		      
		      if (asession_temp->serverid == NULL) {
		        if ((asession_temp->serverid = pool_alloc_from(apools.serverid, apools.ser_msize)) == NULL) {
			  Alert("Not enought Memory process_srv():asession->sessid:malloc().\n");
			  send_log(t->proxy, LOG_ALERT, "Not enought Memory process_srv():asession->sessid:malloc().\n");
		        }
			asession_temp->serverid[0] = '\0';
		      }
		      
		      if (asession_temp->serverid[0] == '\0')
			  memcpy(asession_temp->serverid,t->srv->id,server_id_len);
		      
		      tv_delayfrom(&asession_temp->expire, &now, t->proxy->appsession_timeout);

#if defined(DEBUG_HASH)
		      print_table(&(t->proxy->htbl_proxy));
#endif
		      break;
		    }/* end if ((t->proxy->appsession_name != NULL) ... */
		    else {
			//	fprintf(stderr,"Ignoring unknown cookie : ");
			//	write(2, p1, p2-p1);
			//	fprintf(stderr," = ");
			//	write(2, p3, p4-p3);
			//	fprintf(stderr,"\n");
		    }
		    break; /* we don't want to loop again since there cannot be another cookie on the same line */
		} /* we're now at the end of the cookie value */
	    } /* end of cookie processing */

	    /* check for any set-cookie in case we check for cacheability */
	    if (!delete_header && !(t->flags & SN_SCK_ANY) &&
		(t->proxy->options & PR_O_CHK_CACHE) &&
		(strncasecmp(rep->h, "Set-Cookie: ", 12) == 0)) {
		t->flags |= SN_SCK_ANY;
	    }

	    /* let's look if we have to delete this header */
	    if (delete_header && !(t->flags & SN_SVDENY))
		buffer_replace2(rep, rep->h, rep->lr, "", 0);

	    rep->h = rep->lr;
	} /* while (rep->lr < rep->r) */

	/* end of header processing (even if incomplete) */

	if ((rep->l < rep->rlim - rep->data) && ! FD_ISSET(t->srv_fd, StaticReadEvent)) {
	    /* fd in StaticReadEvent was disabled, perhaps because of a previous buffer
	     * full. We cannot loop here since event_srv_read will disable it only if
	     * rep->l == rlim-data
	     */
	    FD_SET(t->srv_fd, StaticReadEvent);
	    if (t->proxy->srvtimeout)
		tv_delayfrom(&t->srexpire, &now, t->proxy->srvtimeout);
	    else
		tv_eternity(&t->srexpire);
	}

	/* read error, write error */
	if (t->res_sw == RES_ERROR || t->res_sr == RES_ERROR) {
	    tv_eternity(&t->srexpire);
	    tv_eternity(&t->swexpire);
	    fd_delete(t->srv_fd);
	    if (t->srv)
		t->srv->cur_sess--;
	    t->srv_state = SV_STCLOSE;
	    t->logs.status = 502;
	    client_return(t, t->proxy->errmsg.len502, t->proxy->errmsg.msg502);
	    if (!(t->flags & SN_ERR_MASK))
		t->flags |= SN_ERR_SRVCL;
	    if (!(t->flags & SN_FINST_MASK))
		t->flags |= SN_FINST_H;
	    /* We used to have a free connection slot. Since we'll never use it,
	     * we have to pass it on to another session.
	     */
	    if (t->srv)
		offer_connection_slot(t);

	    return 1;
	}
	/* end of client write or end of server read.
	 * since we are in header mode, if there's no space left for headers, we
	 * won't be able to free more later, so the session will never terminate.
	 */
	else if (t->res_sr == RES_NULL || c == CL_STSHUTW || c == CL_STCLOSE || rep->l >= rep->rlim - rep->data) {
	    FD_CLR(t->srv_fd, StaticReadEvent);
	    tv_eternity(&t->srexpire);
	    shutdown(t->srv_fd, SHUT_RD);
	    t->srv_state = SV_STSHUTR;
	    //fprintf(stderr,"%p:%s(%d), c=%d, s=%d\n", t, __FUNCTION__, __LINE__, t->cli_state, t->cli_state);
	    return 1;
	}	
	/* read timeout : return a 504 to the client.
	 */
	else if (FD_ISSET(t->srv_fd, StaticReadEvent) && tv_cmp2_ms(&t->srexpire, &now) <= 0) {
	    tv_eternity(&t->srexpire);
	    tv_eternity(&t->swexpire);
	    fd_delete(t->srv_fd);
	    if (t->srv)
		t->srv->cur_sess--;
	    t->srv_state = SV_STCLOSE;
	    t->logs.status = 504;
	    client_return(t, t->proxy->errmsg.len504, t->proxy->errmsg.msg504);
	    if (!(t->flags & SN_ERR_MASK))
		t->flags |= SN_ERR_SRVTO;
	    if (!(t->flags & SN_FINST_MASK))
		t->flags |= SN_FINST_H;
	    /* We used to have a free connection slot. Since we'll never use it,
	     * we have to pass it on to another session.
	     */
	    if (t->srv)
		offer_connection_slot(t);

	    return 1;
	}	
	/* last client read and buffer empty */
	/* FIXME!!! here, we don't want to switch to SHUTW if the
	 * client shuts read too early, because we may still have
	 * some work to do on the headers.
	 * The side-effect is that if the client completely closes its
	 * connection during SV_STHEADER, the connection to the server
	 * is kept until a response comes back or the timeout is reached.
	 */
	else if ((/*c == CL_STSHUTR ||*/ c == CL_STCLOSE) && (req->l == 0)) {
	    FD_CLR(t->srv_fd, StaticWriteEvent);
	    tv_eternity(&t->swexpire);

	    /* We must ensure that the read part is still alive when switching
	     * to shutw */
	    FD_SET(t->srv_fd, StaticReadEvent);
	    if (t->proxy->srvtimeout)
		tv_delayfrom(&t->srexpire, &now, t->proxy->srvtimeout);

	    shutdown(t->srv_fd, SHUT_WR);
	    t->srv_state = SV_STSHUTW;
	    return 1;
	}
	/* write timeout */
	/* FIXME!!! here, we don't want to switch to SHUTW if the
	 * client shuts read too early, because we may still have
	 * some work to do on the headers.
	 */
	else if (FD_ISSET(t->srv_fd, StaticWriteEvent) && tv_cmp2_ms(&t->swexpire, &now) <= 0) {
	    FD_CLR(t->srv_fd, StaticWriteEvent);
	    tv_eternity(&t->swexpire);
	    shutdown(t->srv_fd, SHUT_WR);
	    /* We must ensure that the read part is still alive when switching
	     * to shutw */
	    FD_SET(t->srv_fd, StaticReadEvent);
	    if (t->proxy->srvtimeout)
		tv_delayfrom(&t->srexpire, &now, t->proxy->srvtimeout);

	    /* We must ensure that the read part is still alive when switching
	     * to shutw */
	    FD_SET(t->srv_fd, StaticReadEvent);
	    if (t->proxy->srvtimeout)
		tv_delayfrom(&t->srexpire, &now, t->proxy->srvtimeout);

	    t->srv_state = SV_STSHUTW;
	    if (!(t->flags & SN_ERR_MASK))
		t->flags |= SN_ERR_SRVTO;
	    if (!(t->flags & SN_FINST_MASK))
		t->flags |= SN_FINST_H;
	    return 1;
	}

	if (req->l == 0) {
	    if (FD_ISSET(t->srv_fd, StaticWriteEvent)) {
		FD_CLR(t->srv_fd, StaticWriteEvent); /* stop writing */
		tv_eternity(&t->swexpire);
	    }
	}
	else { /* client buffer not empty */
	    if (! FD_ISSET(t->srv_fd, StaticWriteEvent)) {
		FD_SET(t->srv_fd, StaticWriteEvent); /* restart writing */
		if (t->proxy->srvtimeout) {
		    tv_delayfrom(&t->swexpire, &now, t->proxy->srvtimeout);
		    /* FIXME: to prevent the server from expiring read timeouts during writes,
		     * we refresh it. */
		    t->srexpire = t->swexpire;
		}
		else
		    tv_eternity(&t->swexpire);
	    }
	}

	/* be nice with the client side which would like to send a complete header
	 * FIXME: COMPLETELY BUGGY !!! not all headers may be processed because the client
	 * would read all remaining data at once ! The client should not write past rep->lr
	 * when the server is in header state.
	 */
	//return header_processed;
	return t->srv_state != SV_STHEADERS;
    }
    else if (s == SV_STDATA) {
	/* read or write error */
	if (t->res_sw == RES_ERROR || t->res_sr == RES_ERROR) {
	    tv_eternity(&t->srexpire);
	    tv_eternity(&t->swexpire);
	    fd_delete(t->srv_fd);
	    if (t->srv)
		t->srv->cur_sess--;
	    t->srv_state = SV_STCLOSE;
	    if (!(t->flags & SN_ERR_MASK))
		t->flags |= SN_ERR_SRVCL;
	    if (!(t->flags & SN_FINST_MASK))
		t->flags |= SN_FINST_D;
	    /* We used to have a free connection slot. Since we'll never use it,
	     * we have to pass it on to another session.
	     */
	    if (t->srv)
		offer_connection_slot(t);

	    return 1;
	}
	/* last read, or end of client write */
	else if (t->res_sr == RES_NULL || c == CL_STSHUTW || c == CL_STCLOSE) {
	    FD_CLR(t->srv_fd, StaticReadEvent);
	    tv_eternity(&t->srexpire);
	    shutdown(t->srv_fd, SHUT_RD);
	    t->srv_state = SV_STSHUTR;
	    //fprintf(stderr,"%p:%s(%d), c=%d, s=%d\n", t, __FUNCTION__, __LINE__, t->cli_state, t->cli_state);
	    return 1;
	}
	/* end of client read and no more data to send */
	else if ((c == CL_STSHUTR || c == CL_STCLOSE) && (req->l == 0)) {
	    FD_CLR(t->srv_fd, StaticWriteEvent);
	    tv_eternity(&t->swexpire);
	    shutdown(t->srv_fd, SHUT_WR);
	    /* We must ensure that the read part is still alive when switching
	     * to shutw */
	    FD_SET(t->srv_fd, StaticReadEvent);
	    if (t->proxy->srvtimeout)
		tv_delayfrom(&t->srexpire, &now, t->proxy->srvtimeout);

	    t->srv_state = SV_STSHUTW;
	    return 1;
	}
	/* read timeout */
	else if (tv_cmp2_ms(&t->srexpire, &now) <= 0) {
	    FD_CLR(t->srv_fd, StaticReadEvent);
	    tv_eternity(&t->srexpire);
	    shutdown(t->srv_fd, SHUT_RD);
	    t->srv_state = SV_STSHUTR;
	    if (!(t->flags & SN_ERR_MASK))
		t->flags |= SN_ERR_SRVTO;
	    if (!(t->flags & SN_FINST_MASK))
		t->flags |= SN_FINST_D;
	    return 1;
	}	
	/* write timeout */
	else if (tv_cmp2_ms(&t->swexpire, &now) <= 0) {
	    FD_CLR(t->srv_fd, StaticWriteEvent);
	    tv_eternity(&t->swexpire);
	    shutdown(t->srv_fd, SHUT_WR);
	    /* We must ensure that the read part is still alive when switching
	     * to shutw */
	    FD_SET(t->srv_fd, StaticReadEvent);
	    if (t->proxy->srvtimeout)
		tv_delayfrom(&t->srexpire, &now, t->proxy->srvtimeout);
	    t->srv_state = SV_STSHUTW;
	    if (!(t->flags & SN_ERR_MASK))
		t->flags |= SN_ERR_SRVTO;
	    if (!(t->flags & SN_FINST_MASK))
		t->flags |= SN_FINST_D;
	    return 1;
	}

	/* recompute request time-outs */
	if (req->l == 0) {
	    if (FD_ISSET(t->srv_fd, StaticWriteEvent)) {
		FD_CLR(t->srv_fd, StaticWriteEvent); /* stop writing */
		tv_eternity(&t->swexpire);
	    }
	}
	else { /* buffer not empty, there are still data to be transferred */
	    if (! FD_ISSET(t->srv_fd, StaticWriteEvent)) {
		FD_SET(t->srv_fd, StaticWriteEvent); /* restart writing */
		if (t->proxy->srvtimeout) {
		    tv_delayfrom(&t->swexpire, &now, t->proxy->srvtimeout);
		    /* FIXME: to prevent the server from expiring read timeouts during writes,
		     * we refresh it. */
		    t->srexpire = t->swexpire;
		}
		else
		    tv_eternity(&t->swexpire);
	    }
	}

	/* recompute response time-outs */
	if (rep->l == BUFSIZE) { /* no room to read more data */
	    if (FD_ISSET(t->srv_fd, StaticReadEvent)) {
		FD_CLR(t->srv_fd, StaticReadEvent);
		tv_eternity(&t->srexpire);
	    }
	}
	else {
	    if (! FD_ISSET(t->srv_fd, StaticReadEvent)) {
		FD_SET(t->srv_fd, StaticReadEvent);
		if (t->proxy->srvtimeout)
		    tv_delayfrom(&t->srexpire, &now, t->proxy->srvtimeout);
		else
		    tv_eternity(&t->srexpire);
	    }
	}

	return 0; /* other cases change nothing */
    }
    else if (s == SV_STSHUTR) {
	if (t->res_sw == RES_ERROR) {
	    //FD_CLR(t->srv_fd, StaticWriteEvent);
	    tv_eternity(&t->swexpire);
	    fd_delete(t->srv_fd);
	    if (t->srv)
		t->srv->cur_sess--;
	    //close(t->srv_fd);
	    t->srv_state = SV_STCLOSE;
	    if (!(t->flags & SN_ERR_MASK))
		t->flags |= SN_ERR_SRVCL;
	    if (!(t->flags & SN_FINST_MASK))
		t->flags |= SN_FINST_D;
	    /* We used to have a free connection slot. Since we'll never use it,
	     * we have to pass it on to another session.
	     */
	    if (t->srv)
		offer_connection_slot(t);

	    return 1;
	}
	else if ((c == CL_STSHUTR || c == CL_STCLOSE) && (req->l == 0)) {
	    //FD_CLR(t->srv_fd, StaticWriteEvent);
	    tv_eternity(&t->swexpire);
	    fd_delete(t->srv_fd);
	    if (t->srv)
		t->srv->cur_sess--;
	    //close(t->srv_fd);
	    t->srv_state = SV_STCLOSE;
	    /* We used to have a free connection slot. Since we'll never use it,
	     * we have to pass it on to another session.
	     */
	    if (t->srv)
		offer_connection_slot(t);

	    return 1;
	}
	else if (tv_cmp2_ms(&t->swexpire, &now) <= 0) {
	    //FD_CLR(t->srv_fd, StaticWriteEvent);
	    tv_eternity(&t->swexpire);
	    fd_delete(t->srv_fd);
	    if (t->srv)
		t->srv->cur_sess--;
	    //close(t->srv_fd);
	    t->srv_state = SV_STCLOSE;
	    if (!(t->flags & SN_ERR_MASK))
		t->flags |= SN_ERR_SRVTO;
	    if (!(t->flags & SN_FINST_MASK))
		t->flags |= SN_FINST_D;
	    /* We used to have a free connection slot. Since we'll never use it,
	     * we have to pass it on to another session.
	     */
	    if (t->srv)
		offer_connection_slot(t);

	    return 1;
	}
	else if (req->l == 0) {
	    if (FD_ISSET(t->srv_fd, StaticWriteEvent)) {
		FD_CLR(t->srv_fd, StaticWriteEvent); /* stop writing */
		tv_eternity(&t->swexpire);
	    }
	}
	else { /* buffer not empty */
	    if (! FD_ISSET(t->srv_fd, StaticWriteEvent)) {
		FD_SET(t->srv_fd, StaticWriteEvent); /* restart writing */
		if (t->proxy->srvtimeout) {
		    tv_delayfrom(&t->swexpire, &now, t->proxy->srvtimeout);
		    /* FIXME: to prevent the server from expiring read timeouts during writes,
		     * we refresh it. */
		    t->srexpire = t->swexpire;
		}
		else
		    tv_eternity(&t->swexpire);
	    }
	}
	return 0;
    }
    else if (s == SV_STSHUTW) {
	if (t->res_sr == RES_ERROR) {
	    //FD_CLR(t->srv_fd, StaticReadEvent);
	    tv_eternity(&t->srexpire);
	    fd_delete(t->srv_fd);
	    if (t->srv)
		t->srv->cur_sess--;
	    //close(t->srv_fd);
	    t->srv_state = SV_STCLOSE;
	    if (!(t->flags & SN_ERR_MASK))
		t->flags |= SN_ERR_SRVCL;
	    if (!(t->flags & SN_FINST_MASK))
		t->flags |= SN_FINST_D;
	    /* We used to have a free connection slot. Since we'll never use it,
	     * we have to pass it on to another session.
	     */
	    if (t->srv)
		offer_connection_slot(t);

	    return 1;
	}
	else if (t->res_sr == RES_NULL || c == CL_STSHUTW || c == CL_STCLOSE) {
	    //FD_CLR(t->srv_fd, StaticReadEvent);
	    tv_eternity(&t->srexpire);
	    fd_delete(t->srv_fd);
	    if (t->srv)
		t->srv->cur_sess--;
	    //close(t->srv_fd);
	    t->srv_state = SV_STCLOSE;
	    /* We used to have a free connection slot. Since we'll never use it,
	     * we have to pass it on to another session.
	     */
	    if (t->srv)
		offer_connection_slot(t);

	    return 1;
	}
	else if (tv_cmp2_ms(&t->srexpire, &now) <= 0) {
	    //FD_CLR(t->srv_fd, StaticReadEvent);
	    tv_eternity(&t->srexpire);
	    fd_delete(t->srv_fd);
	    if (t->srv)
		t->srv->cur_sess--;
	    //close(t->srv_fd);
	    t->srv_state = SV_STCLOSE;
	    if (!(t->flags & SN_ERR_MASK))
		t->flags |= SN_ERR_SRVTO;
	    if (!(t->flags & SN_FINST_MASK))
		t->flags |= SN_FINST_D;
	    /* We used to have a free connection slot. Since we'll never use it,
	     * we have to pass it on to another session.
	     */
	    if (t->srv)
		offer_connection_slot(t);

	    return 1;
	}
	else if (rep->l == BUFSIZE) { /* no room to read more data */
	    if (FD_ISSET(t->srv_fd, StaticReadEvent)) {
		FD_CLR(t->srv_fd, StaticReadEvent);
		tv_eternity(&t->srexpire);
	    }
	}
	else {
	    if (! FD_ISSET(t->srv_fd, StaticReadEvent)) {
		FD_SET(t->srv_fd, StaticReadEvent);
		if (t->proxy->srvtimeout)
		    tv_delayfrom(&t->srexpire, &now, t->proxy->srvtimeout);
		else
		    tv_eternity(&t->srexpire);
	    }
	}
	return 0;
    }
    else { /* SV_STCLOSE : nothing to do */
	if ((global.mode & MODE_DEBUG) && (!(global.mode & MODE_QUIET) || (global.mode & MODE_VERBOSE))) {
	    int len;
	    len = sprintf(trash, "%08x:%s.srvcls[%04x:%04x]\n", t->uniq_id, t->proxy->id, (unsigned short)t->cli_fd, (unsigned short)t->srv_fd);
	    write(1, trash, len);
	}
	return 0;
    }
    return 0;
}


/* Processes the client and server jobs of a session task, then
 * puts it back to the wait queue in a clean state, or
 * cleans up its resources if it must be deleted. Returns
 * the time the task accepts to wait, or TIME_ETERNITY for
 * infinity.
 */
int process_session(struct task *t) {
    struct session *s = t->context;
    int fsm_resync = 0;

    do {
	fsm_resync = 0;
	//fprintf(stderr,"before_cli:cli=%d, srv=%d\n", s->cli_state, s->srv_state);
	fsm_resync |= process_cli(s);
	//fprintf(stderr,"cli/srv:cli=%d, srv=%d\n", s->cli_state, s->srv_state);
	fsm_resync |= process_srv(s);
	//fprintf(stderr,"after_srv:cli=%d, srv=%d\n", s->cli_state, s->srv_state);
    } while (fsm_resync);

    if (s->cli_state != CL_STCLOSE || s->srv_state != SV_STCLOSE) {
	struct timeval min1, min2;
	s->res_cw = s->res_cr = s->res_sw = s->res_sr = RES_SILENT;

	tv_min(&min1, &s->crexpire, &s->cwexpire);
	tv_min(&min2, &s->srexpire, &s->swexpire);
	tv_min(&min1, &min1, &s->cnexpire);
	tv_min(&t->expire, &min1, &min2);

	/* restore t to its place in the task list */
	task_queue(t);

#ifdef DEBUG_FULL
	/* DEBUG code : this should never ever happen, otherwise it indicates
	 * that a task still has something to do and will provoke a quick loop.
	 */
	if (tv_remain2(&now, &t->expire) <= 0)
	    exit(100);
#endif

	return tv_remain2(&now, &t->expire); /* nothing more to do */
    }

    s->proxy->nbconn--;
    actconn--;
    
    if ((global.mode & MODE_DEBUG) && (!(global.mode & MODE_QUIET) || (global.mode & MODE_VERBOSE))) {
	int len;
	len = sprintf(trash, "%08x:%s.closed[%04x:%04x]\n", s->uniq_id, s->proxy->id, (unsigned short)s->cli_fd, (unsigned short)s->srv_fd);
	write(1, trash, len);
    }

    s->logs.t_close = tv_diff(&s->logs.tv_accept, &now);
    if (s->rep != NULL)
	s->logs.bytes = s->rep->total;

    /* let's do a final log if we need it */
    if (s->logs.logwait && (!(s->proxy->options & PR_O_NULLNOLOG) || s->req->total))
	sess_log(s);

    /* the task MUST not be in the run queue anymore */
    task_delete(t);
    session_free(s);
    task_free(t);
    return TIME_ETERNITY; /* rest in peace for eternity */
}



/*
 * manages a server health-check. Returns
 * the time the task accepts to wait, or TIME_ETERNITY for infinity.
 */
int process_chk(struct task *t) {
    struct server *s = t->context;
    struct sockaddr_in sa;
    int fd;

    //fprintf(stderr, "process_chk: task=%p\n", t);

 new_chk:
    fd = s->curfd;
    if (fd < 0) {   /* no check currently running */
	//fprintf(stderr, "process_chk: 2\n");
	if (tv_cmp2_ms(&t->expire, &now) > 0) { /* not good time yet */
	    task_queue(t);	/* restore t to its place in the task list */
	    return tv_remain2(&now, &t->expire);
	}

	/* we don't send any health-checks when the proxy is stopped or when
	 * the server should not be checked.
	 */
	if (!(s->state & SRV_CHECKED) || s->proxy->state == PR_STSTOPPED) {
	    while (tv_cmp2_ms(&t->expire, &now) <= 0)
		tv_delayfrom(&t->expire, &t->expire, s->inter);
	    task_queue(t);	/* restore t to its place in the task list */
	    return tv_remain2(&now, &t->expire);
	}

	/* we'll initiate a new check */
	s->result = 0; /* no result yet */
	if ((fd = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP)) != -1) {
	    if ((fd < global.maxsock) &&
		(fcntl(fd, F_SETFL, O_NONBLOCK) != -1) &&
		(setsockopt(fd, IPPROTO_TCP, TCP_NODELAY, (char *) &one, sizeof(one)) != -1)) {
		//fprintf(stderr, "process_chk: 3\n");

		/* we'll connect to the check port on the server */
		sa = s->addr;
		sa.sin_port = htons(s->check_port);

		/* allow specific binding :
		 * - server-specific at first
		 * - proxy-specific next
		 */
		if (s->state & SRV_BIND_SRC) {
		    setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, (char *) &one, sizeof(one));
		    if (bind(fd, (struct sockaddr *)&s->source_addr, sizeof(s->source_addr)) == -1) {
			Alert("Cannot bind to source address before connect() for server %s/%s. Aborting.\n",
			      s->proxy->id, s->id);
			s->result = -1;
		    }
		}
		else if (s->proxy->options & PR_O_BIND_SRC) {
		    setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, (char *) &one, sizeof(one));
		    if (bind(fd, (struct sockaddr *)&s->proxy->source_addr, sizeof(s->proxy->source_addr)) == -1) {
			Alert("Cannot bind to source address before connect() for proxy %s. Aborting.\n",
			      s->proxy->id);
			s->result = -1;
		    }
		}

		if (!s->result) {
		    if ((connect(fd, (struct sockaddr *)&sa, sizeof(sa)) != -1) || (errno == EINPROGRESS)) {
			/* OK, connection in progress or established */
			
			//fprintf(stderr, "process_chk: 4\n");
			
			s->curfd = fd; /* that's how we know a test is in progress ;-) */
			fdtab[fd].owner = t;
			fdtab[fd].read  = &event_srv_chk_r;
			fdtab[fd].write = &event_srv_chk_w;
			fdtab[fd].state = FD_STCONN; /* connection in progress */
			FD_SET(fd, StaticWriteEvent);  /* for connect status */
#ifdef DEBUG_FULL
			assert (!FD_ISSET(fd, StaticReadEvent));
#endif
			fd_insert(fd);
			/* FIXME: we allow up to <inter> for a connection to establish, but we should use another parameter */
			tv_delayfrom(&t->expire, &now, s->inter);
			task_queue(t);	/* restore t to its place in the task list */
			return tv_remain(&now, &t->expire);
		    }
		    else if (errno != EALREADY && errno != EISCONN && errno != EAGAIN) {
			s->result = -1;    /* a real error */
		    }
		}
	    }
	    close(fd); /* socket creation error */
	}

	if (!s->result) { /* nothing done */
	    //fprintf(stderr, "process_chk: 6\n");
	    while (tv_cmp2_ms(&t->expire, &now) <= 0)
		tv_delayfrom(&t->expire, &t->expire, s->inter);
	    goto new_chk; /* may be we should initialize a new check */
	}

	/* here, we have seen a failure */
	if (s->health > s->rise)
	    s->health--; /* still good */
	else {
	    s->state &= ~SRV_RUNNING;
	    if (s->health == s->rise) {
                recount_servers(s->proxy);
		recalc_server_map(s->proxy);
		Warning("%sServer %s/%s DOWN. %d active and %d backup servers left.%s\n",
                        s->state & SRV_BACKUP ? "Backup " : "",
                        s->proxy->id, s->id, s->proxy->srv_act, s->proxy->srv_bck,
                        (s->proxy->srv_bck && !s->proxy->srv_act) ? " Running on backup." : "");
		send_log(s->proxy, LOG_ALERT,
                         "%sServer %s/%s is DOWN. %d active and %d backup servers left.%s\n",
                         s->state & SRV_BACKUP ? "Backup " : "",
                         s->proxy->id, s->id, s->proxy->srv_act, s->proxy->srv_bck,
                         (s->proxy->srv_bck && !s->proxy->srv_act) ? " Running on backup." : "");

		if (s->proxy->srv_bck == 0 && s->proxy->srv_act == 0) {
		    Alert("Proxy %s has no server available !\n", s->proxy->id);
		    send_log(s->proxy, LOG_EMERG, "Proxy %s has no server available !\n", s->proxy->id);
		}
	    }
	    s->health = 0; /* failure */
	}

	//fprintf(stderr, "process_chk: 7\n");
	/* FIXME: we allow up to <inter> for a connection to establish, but we should use another parameter */
	while (tv_cmp2_ms(&t->expire, &now) <= 0)
	    tv_delayfrom(&t->expire, &t->expire, s->inter);
	goto new_chk;
    }
    else {
	//fprintf(stderr, "process_chk: 8\n");
	/* there was a test running */
	if (s->result > 0) { /* good server detected */
	    //fprintf(stderr, "process_chk: 9\n");
	    s->health++; /* was bad, stays for a while */
	    if (s->health >= s->rise) {
		s->state |= SRV_RUNNING;

		if (s->health == s->rise) {
                    recount_servers(s->proxy);
		    recalc_server_map(s->proxy);
		    Warning("%sServer %s/%s UP. %d active and %d backup servers online.%s\n",
                            s->state & SRV_BACKUP ? "Backup " : "",
                            s->proxy->id, s->id, s->proxy->srv_act, s->proxy->srv_bck,
                            (s->proxy->srv_bck && !s->proxy->srv_act) ? " Running on backup." : "");
		    send_log(s->proxy, LOG_NOTICE,
                             "%sServer %s/%s is UP. %d active and %d backup servers online.%s\n",
                             s->state & SRV_BACKUP ? "Backup " : "",
                             s->proxy->id, s->id, s->proxy->srv_act, s->proxy->srv_bck,
                             (s->proxy->srv_bck && !s->proxy->srv_act) ? " Running on backup." : "");
		}

		s->health = s->rise + s->fall - 1; /* OK now */
	    }
	    s->curfd = -1; /* no check running anymore */
	    //FD_CLR(fd, StaticWriteEvent);
	    fd_delete(fd);
	    while (tv_cmp2_ms(&t->expire, &now) <= 0)
	        tv_delayfrom(&t->expire, &t->expire, s->inter);
	    goto new_chk;
	}
	else if (s->result < 0 || tv_cmp2_ms(&t->expire, &now) <= 0) {
	    //fprintf(stderr, "process_chk: 10\n");
	    /* failure or timeout detected */
	    if (s->health > s->rise)
		s->health--; /* still good */
	    else {
		s->state &= ~SRV_RUNNING;

                if (s->health == s->rise) {
                    recount_servers(s->proxy);
		    recalc_server_map(s->proxy);
                    Warning("%sServer %s/%s DOWN. %d active and %d backup servers left.%s\n",
                            s->state & SRV_BACKUP ? "Backup " : "",
                            s->proxy->id, s->id, s->proxy->srv_act, s->proxy->srv_bck,
                            (s->proxy->srv_bck && !s->proxy->srv_act) ? " Running on backup." : "");
                    send_log(s->proxy, LOG_ALERT,
                             "%sServer %s/%s is DOWN. %d active and %d backup servers left.%s\n",
                             s->state & SRV_BACKUP ? "Backup " : "",
                             s->proxy->id, s->id, s->proxy->srv_act, s->proxy->srv_bck,
                             (s->proxy->srv_bck && !s->proxy->srv_act) ? " Running on backup." : "");
                    
                    if (s->proxy->srv_bck == 0 && s->proxy->srv_act == 0) {
                        Alert("Proxy %s has no server available !\n", s->proxy->id);
                        send_log(s->proxy, LOG_EMERG, "Proxy %s has no server available !\n", s->proxy->id);
                    }
                }

		s->health = 0; /* failure */
	    }
	    s->curfd = -1;
	    //FD_CLR(fd, StaticWriteEvent);
	    fd_delete(fd);
	    while (tv_cmp2_ms(&t->expire, &now) <= 0)
	        tv_delayfrom(&t->expire, &t->expire, s->inter);
	    goto new_chk;
	}
	/* if result is 0 and there's no timeout, we have to wait again */
    }
    //fprintf(stderr, "process_chk: 11\n");
    s->result = 0;
    task_queue(t);	/* restore t to its place in the task list */
    return tv_remain2(&now, &t->expire);
}



#if STATTIME > 0
int stats(void);
#endif

/*
 * This does 4 things :
 *   - wake up all expired tasks
 *   - call all runnable tasks
 *   - call maintain_proxies() to enable/disable the listeners
 *   - return the delay till next event in ms, -1 = wait indefinitely
 * Note: this part should be rewritten with the O(ln(n)) scheduler.
 *
 */

int process_runnable_tasks() {
  int next_time;
  int time2;
  struct task *t, *tnext;

  next_time = TIME_ETERNITY; /* set the timer to wait eternally first */

  /* look for expired tasks and add them to the run queue.
   */
  tnext = ((struct task *)LIST_HEAD(wait_queue[0]))->next;
  while ((t = tnext) != LIST_HEAD(wait_queue[0])) { /* we haven't looped ? */
      tnext = t->next;
      if (t->state & TASK_RUNNING)
	  continue;
      
      if (tv_iseternity(&t->expire))
	  continue;

      /* wakeup expired entries. It doesn't matter if they are
       * already running because of a previous event
       */
      if (tv_cmp_ms(&t->expire, &now) <= 0) {
	  task_wakeup(&rq, t);
      }
      else {
	  /* first non-runnable task. Use its expiration date as an upper bound */
	  int temp_time = tv_remain(&now, &t->expire);
	  if (temp_time)
	      next_time = temp_time;
	  break;
      }
  }

  /* process each task in the run queue now. Each task may be deleted
   * since we only use the run queue's head. Note that any task can be
   * woken up by any other task and it will be processed immediately
   * after as it will be queued on the run queue's head.
   */
  while ((t = rq) != NULL) {
      int temp_time;

      task_sleep(&rq, t);
      temp_time = t->process(t);
      next_time = MINTIME(temp_time, next_time);
  }
  
  /* maintain all proxies in a consistent state. This should quickly become a task */
  time2 = maintain_proxies();
  return MINTIME(time2, next_time);
}


#if defined(ENABLE_EPOLL)

/*
 * Main epoll() loop.
 */

/* does 3 actions :
 * 0 (POLL_LOOP_ACTION_INIT)  : initializes necessary private structures
 * 1 (POLL_LOOP_ACTION_RUN)   : runs the loop
 * 2 (POLL_LOOP_ACTION_CLEAN) : cleans up
 *
 * returns 0 if initialization failed, !0 otherwise.
 */

int epoll_loop(int action) {
  int next_time;
  int status;
  int fd;

  int fds, count;
  int pr, pw, sr, sw;
  unsigned rn, ro, wn, wo; /* read new, read old, write new, write old */
  struct epoll_event ev;

  /* private data */
  static struct epoll_event *epoll_events = NULL;
  static int epoll_fd;

  if (action == POLL_LOOP_ACTION_INIT) {
      epoll_fd = epoll_create(global.maxsock + 1);
      if (epoll_fd < 0)
	  return 0;
      else {
	  epoll_events = (struct epoll_event*)
	      calloc(1, sizeof(struct epoll_event) * global.maxsock);
	  PrevReadEvent = (fd_set *)
	      calloc(1, sizeof(fd_set) * (global.maxsock + FD_SETSIZE - 1) / FD_SETSIZE);
	  PrevWriteEvent = (fd_set *)
	      calloc(1, sizeof(fd_set) * (global.maxsock + FD_SETSIZE - 1) / FD_SETSIZE);
      }
      return 1;
  }
  else if (action == POLL_LOOP_ACTION_CLEAN) {
      if (PrevWriteEvent) free(PrevWriteEvent);
      if (PrevReadEvent)  free(PrevReadEvent);
      if (epoll_events)   free(epoll_events);
      close(epoll_fd);
      epoll_fd = 0;
      return 1;
  }

  /* OK, it's POLL_LOOP_ACTION_RUN */

  tv_now(&now);

  while (1) {
      next_time = process_runnable_tasks();

      /* stop when there's no connection left and we don't allow them anymore */
      if (!actconn && listeners == 0)
	  break;

#if STATTIME > 0
      {
	  int time2;
	  time2 = stats();
	  next_time = MINTIME(time2, next_time);
      }
#endif

      for (fds = 0; (fds << INTBITS) < maxfd; fds++) {
	  
	  rn = ((int*)StaticReadEvent)[fds];  ro = ((int*)PrevReadEvent)[fds];
	  wn = ((int*)StaticWriteEvent)[fds]; wo = ((int*)PrevWriteEvent)[fds];
	  
	  if ((ro^rn) | (wo^wn)) {
	      for (count = 0, fd = fds << INTBITS; count < (1<<INTBITS) && fd < maxfd; count++, fd++) {
#define FDSETS_ARE_INT_ALIGNED
#ifdef FDSETS_ARE_INT_ALIGNED

#define WE_REALLY_NOW_THAT_FDSETS_ARE_INTS
#ifdef WE_REALLY_NOW_THAT_FDSETS_ARE_INTS
		  pr = (ro >> count) & 1;
		  pw = (wo >> count) & 1;
		  sr = (rn >> count) & 1;
		  sw = (wn >> count) & 1;
#else
		  pr = FD_ISSET(fd&((1<<INTBITS)-1), (typeof(fd_set*))&ro);
		  pw = FD_ISSET(fd&((1<<INTBITS)-1), (typeof(fd_set*))&wo);
		  sr = FD_ISSET(fd&((1<<INTBITS)-1), (typeof(fd_set*))&rn);
		  sw = FD_ISSET(fd&((1<<INTBITS)-1), (typeof(fd_set*))&wn);
#endif
#else
		  pr = FD_ISSET(fd, PrevReadEvent);
		  pw = FD_ISSET(fd, PrevWriteEvent);
		  sr = FD_ISSET(fd, StaticReadEvent);
		  sw = FD_ISSET(fd, StaticWriteEvent);
#endif
		  if (!((sr^pr) | (sw^pw)))
		      continue;

		  ev.events = (sr ? EPOLLIN : 0) | (sw ? EPOLLOUT : 0);
		  ev.data.fd = fd;

#ifdef EPOLL_CTL_MOD_WORKAROUND
		  /* I encountered a rarely reproducible problem with
		   * EPOLL_CTL_MOD where a modified FD (systematically
		   * the one in epoll_events[0], fd#7) would sometimes
		   * be set EPOLL_OUT while asked for a read ! This is
		   * with the 2.4 epoll patch. The workaround is to
		   * delete then recreate in case of modification.
		   * This is in 2.4 up to epoll-lt-0.21 but not in 2.6
		   * nor RHEL kernels.
		   */

		  if ((pr | pw) && fdtab[fd].state != FD_STCLOSE)
		      epoll_ctl(epoll_fd, EPOLL_CTL_DEL, fd, &ev);

		  if ((sr | sw))
		      epoll_ctl(epoll_fd, EPOLL_CTL_ADD, fd, &ev);
#else
		  if ((pr | pw)) {
		      /* the file-descriptor already exists... */
		      if ((sr | sw)) {
			  /* ...and it will still exist */
			  if (epoll_ctl(epoll_fd, EPOLL_CTL_MOD, fd, &ev) < 0) {
			      // perror("epoll_ctl(MOD)");
			      // exit(1);
			  }
		      } else {
			  /* ...and it will be removed */
			  if (fdtab[fd].state != FD_STCLOSE &&
			      epoll_ctl(epoll_fd, EPOLL_CTL_DEL, fd, &ev) < 0) {
			      // perror("epoll_ctl(DEL)");
			      // exit(1);
			  }
		      }
		  } else {
		      /* the file-descriptor did not exist, let's add it */
		      if (epoll_ctl(epoll_fd, EPOLL_CTL_ADD, fd, &ev) < 0) {
			  // perror("epoll_ctl(ADD)");
			  //  exit(1);
		      }
		  }
#endif // EPOLL_CTL_MOD_WORKAROUND
	      }
	      ((int*)PrevReadEvent)[fds] = rn;
	      ((int*)PrevWriteEvent)[fds] = wn;
	  }		  
      }
      
      /* now let's wait for events */
      status = epoll_wait(epoll_fd, epoll_events, maxfd, next_time);
      tv_now(&now);

      for (count = 0; count < status; count++) {
	  fd = epoll_events[count].data.fd;

	  if (FD_ISSET(fd, StaticReadEvent)) {
		  if (fdtab[fd].state == FD_STCLOSE)
			  continue;
		  if (epoll_events[count].events & ( EPOLLIN | EPOLLERR | EPOLLHUP ))
			  fdtab[fd].read(fd);
	  }

	  if (FD_ISSET(fd, StaticWriteEvent)) {
		  if (fdtab[fd].state == FD_STCLOSE)
			  continue;
		  if (epoll_events[count].events & ( EPOLLOUT | EPOLLERR | EPOLLHUP ))
			  fdtab[fd].write(fd);
	  }
      }
  }
  return 1;
}
#endif



#if defined(ENABLE_POLL)

/*
 * Main poll() loop.
 */

/* does 3 actions :
 * 0 (POLL_LOOP_ACTION_INIT)  : initializes necessary private structures
 * 1 (POLL_LOOP_ACTION_RUN)   : runs the loop
 * 2 (POLL_LOOP_ACTION_CLEAN) : cleans up
 *
 * returns 0 if initialization failed, !0 otherwise.
 */

int poll_loop(int action) {
  int next_time;
  int status;
  int fd, nbfd;

  int fds, count;
  int sr, sw;
  unsigned rn, wn; /* read new, write new */

  /* private data */
  static struct pollfd *poll_events = NULL;

  if (action == POLL_LOOP_ACTION_INIT) {
      poll_events = (struct pollfd*)
	  calloc(1, sizeof(struct pollfd) * global.maxsock);
      return 1;
  }
  else if (action == POLL_LOOP_ACTION_CLEAN) {
      if (poll_events)
	  free(poll_events);
      return 1;
  }

  /* OK, it's POLL_LOOP_ACTION_RUN */

  tv_now(&now);

  while (1) {
      next_time = process_runnable_tasks();

      /* stop when there's no connection left and we don't allow them anymore */
      if (!actconn && listeners == 0)
	  break;

#if STATTIME > 0
      {
	  int time2;
	  time2 = stats();
	  next_time = MINTIME(time2, next_time);
      }
#endif


      nbfd = 0;
      for (fds = 0; (fds << INTBITS) < maxfd; fds++) {
	  
	  rn = ((int*)StaticReadEvent)[fds];
	  wn = ((int*)StaticWriteEvent)[fds];
	  
	  if ((rn|wn)) {
	      for (count = 0, fd = fds << INTBITS; count < (1<<INTBITS) && fd < maxfd; count++, fd++) {
#define FDSETS_ARE_INT_ALIGNED
#ifdef FDSETS_ARE_INT_ALIGNED

#define WE_REALLY_NOW_THAT_FDSETS_ARE_INTS
#ifdef WE_REALLY_NOW_THAT_FDSETS_ARE_INTS
		  sr = (rn >> count) & 1;
		  sw = (wn >> count) & 1;
#else
		  sr = FD_ISSET(fd&((1<<INTBITS)-1), (typeof(fd_set*))&rn);
		  sw = FD_ISSET(fd&((1<<INTBITS)-1), (typeof(fd_set*))&wn);
#endif
#else
		  sr = FD_ISSET(fd, StaticReadEvent);
		  sw = FD_ISSET(fd, StaticWriteEvent);
#endif
		  if ((sr|sw)) {
		      poll_events[nbfd].fd = fd;
		      poll_events[nbfd].events = (sr ? POLLIN : 0) | (sw ? POLLOUT : 0);
		      nbfd++;
		  }
	      }
	  }		  
      }
      
      /* now let's wait for events */
      status = poll(poll_events, nbfd, next_time);
      tv_now(&now);

      for (count = 0; status > 0 && count < nbfd; count++) {
	  fd = poll_events[count].fd;
	  
	  if (!poll_events[count].revents & ( POLLOUT | POLLIN | POLLERR | POLLHUP ))
	      continue;

	  /* ok, we found one active fd */
	  status--;

	  if (FD_ISSET(fd, StaticReadEvent)) {
		  if (fdtab[fd].state == FD_STCLOSE)
			  continue;
		  if (poll_events[count].revents & ( POLLIN | POLLERR | POLLHUP ))
			  fdtab[fd].read(fd);
	  }
	  
	  if (FD_ISSET(fd, StaticWriteEvent)) {
		  if (fdtab[fd].state == FD_STCLOSE)
			  continue;
		  if (poll_events[count].revents & ( POLLOUT | POLLERR | POLLHUP ))
			  fdtab[fd].write(fd);
	  }
      }
  }
  return 1;
}
#endif



/*
 * Main select() loop.
 */

/* does 3 actions :
 * 0 (POLL_LOOP_ACTION_INIT)  : initializes necessary private structures
 * 1 (POLL_LOOP_ACTION_RUN)   : runs the loop
 * 2 (POLL_LOOP_ACTION_CLEAN) : cleans up
 *
 * returns 0 if initialization failed, !0 otherwise.
 */


int select_loop(int action) {
  int next_time;
  int status;
  int fd,i;
  struct timeval delta;
  int readnotnull, writenotnull;
  static fd_set	*ReadEvent = NULL, *WriteEvent = NULL;

  if (action == POLL_LOOP_ACTION_INIT) {
      ReadEvent = (fd_set *)
	  calloc(1, sizeof(fd_set) * (global.maxsock + FD_SETSIZE - 1) / FD_SETSIZE);
      WriteEvent = (fd_set *)
	  calloc(1, sizeof(fd_set) * (global.maxsock + FD_SETSIZE - 1) / FD_SETSIZE);
      return 1;
  }
  else if (action == POLL_LOOP_ACTION_CLEAN) {
      if (WriteEvent)       free(WriteEvent);
      if (ReadEvent)        free(ReadEvent);
      return 1;
  }

  /* OK, it's POLL_LOOP_ACTION_RUN */

  tv_now(&now);

  while (1) {
      next_time = process_runnable_tasks();

      /* stop when there's no connection left and we don't allow them anymore */
      if (!actconn && listeners == 0)
	  break;

#if STATTIME > 0
      {
	  int time2;
	  time2 = stats();
	  next_time = MINTIME(time2, next_time);
      }
#endif

      if (next_time > 0) {  /* FIXME */
	  /* Convert to timeval */
	  /* to avoid eventual select loops due to timer precision */
	  next_time += SCHEDULER_RESOLUTION;
	  delta.tv_sec  = next_time / 1000; 
	  delta.tv_usec = (next_time % 1000) * 1000;
      }
      else if (next_time == 0) { /* allow select to return immediately when needed */
	  delta.tv_sec = delta.tv_usec = 0;
      }


      /* let's restore fdset state */

      readnotnull = 0; writenotnull = 0;
      for (i = 0; i < (maxfd + FD_SETSIZE - 1)/(8*sizeof(int)); i++) {
	  readnotnull |= (*(((int*)ReadEvent)+i) = *(((int*)StaticReadEvent)+i)) != 0;
	  writenotnull |= (*(((int*)WriteEvent)+i) = *(((int*)StaticWriteEvent)+i)) != 0;
      }

      //	/* just a verification code, needs to be removed for performance */
      //	for (i=0; i<maxfd; i++) {
      //	    if (FD_ISSET(i, ReadEvent) != FD_ISSET(i, StaticReadEvent))
      //		abort();
      //	    if (FD_ISSET(i, WriteEvent) != FD_ISSET(i, StaticWriteEvent))
      //		abort();
      //	    
      //	}

      status = select(maxfd,
		      readnotnull ? ReadEvent : NULL,
		      writenotnull ? WriteEvent : NULL,
		      NULL,
		      (next_time >= 0) ? &delta : NULL);
      
      /* this is an experiment on the separation of the select work */
      // status  = (readnotnull  ? select(maxfd, ReadEvent, NULL, NULL, (next_time >= 0) ? &delta : NULL) : 0);
      // status |= (writenotnull ? select(maxfd, NULL, WriteEvent, NULL, (next_time >= 0) ? &delta : NULL) : 0);
      
      tv_now(&now);

      if (status > 0) { /* must proceed with events */

	  int fds;
	  char count;
	  
	  for (fds = 0; (fds << INTBITS) < maxfd; fds++)
	      if ((((int *)(ReadEvent))[fds] | ((int *)(WriteEvent))[fds]) != 0)
		  for (count = 1<<INTBITS, fd = fds << INTBITS; count && fd < maxfd; count--, fd++) {
		      
		      /* if we specify read first, the accepts and zero reads will be
		       * seen first. Moreover, system buffers will be flushed faster.
		       */
			  if (FD_ISSET(fd, ReadEvent)) {
				  if (fdtab[fd].state == FD_STCLOSE)
					  continue;
				  fdtab[fd].read(fd);
			  }

			  if (FD_ISSET(fd, WriteEvent)) {
				  if (fdtab[fd].state == FD_STCLOSE)
					  continue;
				  fdtab[fd].write(fd);
			  }
		  }
      }
      else {
	  //	  fprintf(stderr,"select returned %d, maxfd=%d\n", status, maxfd);
      }
  }
  return 1;
}


#if STATTIME > 0
/*
 * Display proxy statistics regularly. It is designed to be called from the
 * select_loop().
 */
int stats(void) {
    static int lines;
    static struct timeval nextevt;
    static struct timeval lastevt;
    static struct timeval starttime = {0,0};
    unsigned long totaltime, deltatime;
    int ret;

    if (tv_cmp(&now, &nextevt) > 0) {
	deltatime = (tv_diff(&lastevt, &now)?:1);
	totaltime = (tv_diff(&starttime, &now)?:1);
	
	if (global.mode & MODE_STATS) {	
		if ((lines++ % 16 == 0) && !(global.mode & MODE_LOG))
		    qfprintf(stderr,
			    "\n active   total  tsknew tskgood tskleft tskrght tsknsch tsklsch tskrsch\n");
		if (lines>1) {
			qfprintf(stderr,"%07d %07d %07d %07d %07d %07d %07d %07d %07d\n",
				actconn, totalconn,
				stats_tsk_new, stats_tsk_good,
				stats_tsk_left, stats_tsk_right,
				stats_tsk_nsrch, stats_tsk_lsrch, stats_tsk_rsrch);
		}
	}
	    
	tv_delayfrom(&nextevt, &now, STATTIME);

	lastevt=now;
    }	
    ret = tv_remain(&now, &nextevt);
    return ret;
}
#endif


/*
 * this function enables proxies when there are enough free sessions,
 * or stops them when the table is full. It is designed to be called from the
 * select_loop(). It returns the time left before next expiration event
 * during stop time, TIME_ETERNITY otherwise.
 */
static int maintain_proxies(void) {
    struct proxy *p;
    struct listener *l;
    int tleft; /* time left */

    p = proxy;
    tleft = TIME_ETERNITY; /* infinite time */

    /* if there are enough free sessions, we'll activate proxies */
    if (actconn < global.maxconn) {
	while (p) {
	    if (p->nbconn < p->maxconn) {
		if (p->state == PR_STIDLE) {
		    for (l = p->listen; l != NULL; l = l->next) {
			FD_SET(l->fd, StaticReadEvent);
		    }
		    p->state = PR_STRUN;
		}
	    }
	    else {
		if (p->state == PR_STRUN) {
		    for (l = p->listen; l != NULL; l = l->next) {
			FD_CLR(l->fd, StaticReadEvent);
		    }
		    p->state = PR_STIDLE;
		}
	    }
	    p = p->next;
	}
    }
    else {  /* block all proxies */
	while (p) {
	    if (p->state == PR_STRUN) {
		for (l = p->listen; l != NULL; l = l->next) {
		    FD_CLR(l->fd, StaticReadEvent);
		}
		p->state = PR_STIDLE;
	    }
	    p = p->next;
	}
    }

    if (stopping) {
	p = proxy;
	while (p) {
	    if (p->state != PR_STSTOPPED) {
		int t;
		t = tv_remain2(&now, &p->stop_time);
		if (t == 0) {
		    Warning("Proxy %s stopped.\n", p->id);
		    send_log(p, LOG_WARNING, "Proxy %s stopped.\n", p->id);

		    for (l = p->listen; l != NULL; l = l->next) {
			fd_delete(l->fd);
			listeners--;
		    }
		    p->state = PR_STSTOPPED;
		}
		else {
		    tleft = MINTIME(t, tleft);
		}
	    }
	    p = p->next;
	}
    }
    return tleft;
}

/*
 * this function disables health-check servers so that the process will quickly be ignored
 * by load balancers. Note that if a proxy was already in the PAUSED state, then its grace
 * time will not be used since it would already not listen anymore to the socket.
 */
static void soft_stop(void) {
    struct proxy *p;

    stopping = 1;
    p = proxy;
    tv_now(&now); /* else, the old time before select will be used */
    while (p) {
	if (p->state != PR_STSTOPPED) {
	    Warning("Stopping proxy %s in %d ms.\n", p->id, p->grace);
	    send_log(p, LOG_WARNING, "Stopping proxy %s in %d ms.\n", p->id, p->grace);
	    tv_delayfrom(&p->stop_time, &now, p->grace);
	}
	p = p->next;
    }
}

static void pause_proxy(struct proxy *p) {
    struct listener *l;
    for (l = p->listen; l != NULL; l = l->next) {
	shutdown(l->fd, SHUT_RD);
	FD_CLR(l->fd, StaticReadEvent);
	p->state = PR_STPAUSED;
    }
}

/*
 * This function temporarily disables listening so that another new instance
 * can start listening. It is designed to be called upon reception of a
 * SIGTTOU, after which either a SIGUSR1 can be sent to completely stop
 * the proxy, or a SIGTTIN can be sent to listen again.
 */
static void pause_proxies(void) {
    struct proxy *p;

    p = proxy;
    tv_now(&now); /* else, the old time before select will be used */
    while (p) {
	if (p->state != PR_STSTOPPED && p->state != PR_STPAUSED) {
	    Warning("Pausing proxy %s.\n", p->id);
	    send_log(p, LOG_WARNING, "Pausing proxy %s.\n", p->id);
	    pause_proxy(p);
	}
	p = p->next;
    }
}


/*
 * This function reactivates listening. This can be used after a call to
 * sig_pause(), for example when a new instance has failed starting up.
 * It is designed to be called upon reception of a SIGTTIN.
 */
static void listen_proxies(void) {
    struct proxy *p;
    struct listener *l;

    p = proxy;
    tv_now(&now); /* else, the old time before select will be used */
    while (p) {
	if (p->state == PR_STPAUSED) {
	    Warning("Enabling proxy %s.\n", p->id);
	    send_log(p, LOG_WARNING, "Enabling proxy %s.\n", p->id);

	    for (l = p->listen; l != NULL; l = l->next) {
		if (listen(l->fd, p->maxconn) == 0) {
		    if (actconn < global.maxconn && p->nbconn < p->maxconn) {
			FD_SET(l->fd, StaticReadEvent);
			p->state = PR_STRUN;
		    }
		    else
			p->state = PR_STIDLE;
		} else {
		    int port;

		    if (l->addr.ss_family == AF_INET6)
			port = ntohs(((struct sockaddr_in6 *)(&l->addr))->sin6_port);
		    else
 			port = ntohs(((struct sockaddr_in *)(&l->addr))->sin_port);

		    Warning("Port %d busy while trying to enable proxy %s.\n",
			    port, p->id);
		    send_log(p, LOG_WARNING, "Port %d busy while trying to enable proxy %s.\n",
			     port, p->id);
		    /* Another port might have been enabled. Let's stop everything. */
		    pause_proxy(p);
		    break;
		}
	    }
	}
	p = p->next;
    }
}


/*
 * upon SIGUSR1, let's have a soft stop.
 */
void sig_soft_stop(int sig) {
    soft_stop();
    signal(sig, SIG_IGN);
}

/*
 * upon SIGTTOU, we pause everything
 */
void sig_pause(int sig) {
    pause_proxies();
    signal(sig, sig_pause);
}

/*
 * upon SIGTTIN, let's have a soft stop.
 */
void sig_listen(int sig) {
    listen_proxies();
    signal(sig, sig_listen);
}

/*
 * this function dumps every server's state when the process receives SIGHUP.
 */
void sig_dump_state(int sig) {
    struct proxy *p = proxy;

    Warning("SIGHUP received, dumping servers states.\n");
    while (p) {
	struct server *s = p->srv;

	send_log(p, LOG_NOTICE, "SIGHUP received, dumping servers states for proxy %s.\n", p->id);
	while (s) {
	    snprintf(trash, sizeof(trash),
		     "SIGHUP: Server %s/%s is %s. Conn: %d act, %d pend, %d tot.",
		     p->id, s->id,
		     (s->state & SRV_RUNNING) ? "UP" : "DOWN",
		     s->cur_sess, s->nbpend, s->cum_sess);
	    Warning("%s\n", trash);
	    send_log(p, LOG_NOTICE, "%s\n", trash);
	    s = s->next;
	}

	if (p->srv_act == 0) {
	    snprintf(trash, sizeof(trash),
		     "SIGHUP: Proxy %s %s ! Conn: %d act, %d pend (%d unass), %d tot.",
		     p->id,
		     (p->srv_bck) ? "is running on backup servers" : "has no server available",
		     p->nbconn, p->totpend, p->nbpend,  p->cum_conn);
        } else {
	    snprintf(trash, sizeof(trash),
		     "SIGHUP: Proxy %s has %d active servers and %d backup servers available."
		     " Conn: %d act, %d pend (%d unass), %d tot.",
		     p->id, p->srv_act, p->srv_bck,
		     p->nbconn, p->totpend, p->nbpend,  p->cum_conn);
	}
	Warning("%s\n", trash);
	send_log(p, LOG_NOTICE, "%s\n", trash);

	p = p->next;
    }
    signal(sig, sig_dump_state);
}

void dump(int sig) {
    struct task *t, *tnext;
    struct session *s;

    tnext = ((struct task *)LIST_HEAD(wait_queue[0]))->next;
    while ((t = tnext) != LIST_HEAD(wait_queue[0])) { /* we haven't looped ? */
	tnext = t->next;
	s = t->context;
	qfprintf(stderr,"[dump] wq: task %p, still %ld ms, "
		 "cli=%d, srv=%d, cr=%d, cw=%d, sr=%d, sw=%d, "
		 "req=%d, rep=%d, clifd=%d\n",
		 s, tv_remain(&now, &t->expire),
		 s->cli_state,
		 s->srv_state,
		 FD_ISSET(s->cli_fd, StaticReadEvent),
		 FD_ISSET(s->cli_fd, StaticWriteEvent),
		 FD_ISSET(s->srv_fd, StaticReadEvent),
		 FD_ISSET(s->srv_fd, StaticWriteEvent),
		 s->req->l, s->rep?s->rep->l:0, s->cli_fd
		 );
    }
}

#ifdef DEBUG_MEMORY
static void fast_stop(void)
{
    struct proxy *p;
    p = proxy;
    while (p) {
        p->grace = 0;
	p = p->next;
    }
    soft_stop();
}

void sig_int(int sig) {
    /* This would normally be a hard stop,
       but we want to be sure about deallocation,
       and so on, so we do a soft stop with
       0 GRACE time
    */
    fast_stop();
    /* If we are killed twice, we decide to die*/
    signal(sig, SIG_DFL);
}

void sig_term(int sig) {
    /* This would normally be a hard stop,
       but we want to be sure about deallocation,
       and so on, so we do a soft stop with
       0 GRACE time
    */
    fast_stop();
    /* If we are killed twice, we decide to die*/
    signal(sig, SIG_DFL);
}
#endif

/* returns the pointer to an error in the replacement string, or NULL if OK */
char *chain_regex(struct hdr_exp **head, regex_t *preg, int action, char *replace) {
    struct hdr_exp *exp;

    if (replace != NULL) {
	char *err;
	err = check_replace_string(replace);
	if (err)
	    return err;
    }

    while (*head != NULL)
	head = &(*head)->next;

    exp = calloc(1, sizeof(struct hdr_exp));

    exp->preg = preg;
    exp->replace = replace;
    exp->action = action;
    *head = exp;

    return NULL;
}


/*
 * parse a line in a <global> section. Returns 0 if OK, -1 if error.
 */
int cfg_parse_global(char *file, int linenum, char **args) {

    if (!strcmp(args[0], "global")) {  /* new section */
	/* no option, nothing special to do */
	return 0;
    }
    else if (!strcmp(args[0], "daemon")) {
	global.mode |= MODE_DAEMON;
    }
    else if (!strcmp(args[0], "debug")) {
	global.mode |= MODE_DEBUG;
    }
    else if (!strcmp(args[0], "noepoll")) {
	cfg_polling_mechanism &= ~POLL_USE_EPOLL;
    }
    else if (!strcmp(args[0], "nopoll")) {
	cfg_polling_mechanism &= ~POLL_USE_POLL;
    }
    else if (!strcmp(args[0], "quiet")) {
	global.mode |= MODE_QUIET;
    }
    else if (!strcmp(args[0], "stats")) {
	global.mode |= MODE_STATS;
    }
    else if (!strcmp(args[0], "uid")) {
	if (global.uid != 0) {
	    Alert("parsing [%s:%d] : '%s' already specified. Continuing.\n", file, linenum, args[0]);
	    return 0;
	}
	if (*(args[1]) == 0) {
	    Alert("parsing [%s:%d] : '%s' expects an integer argument.\n", file, linenum, args[0]);
	    return -1;
	}
	global.uid = atol(args[1]);
    }
    else if (!strcmp(args[0], "gid")) {
	if (global.gid != 0) {
	    Alert("parsing [%s:%d] : '%s' already specified. Continuing.\n", file, linenum, args[0]);
	    return 0;
	}
	if (*(args[1]) == 0) {
	    Alert("parsing [%s:%d] : '%s' expects an integer argument.\n", file, linenum, args[0]);
	    return -1;
	}
	global.gid = atol(args[1]);
    }
    else if (!strcmp(args[0], "nbproc")) {
	if (global.nbproc != 0) {
	    Alert("parsing [%s:%d] : '%s' already specified. Continuing.\n", file, linenum, args[0]);
	    return 0;
	}
	if (*(args[1]) == 0) {
	    Alert("parsing [%s:%d] : '%s' expects an integer argument.\n", file, linenum, args[0]);
	    return -1;
	}
	global.nbproc = atol(args[1]);
    }
    else if (!strcmp(args[0], "maxconn")) {
	if (global.maxconn != 0) {
	    Alert("parsing [%s:%d] : '%s' already specified. Continuing.\n", file, linenum, args[0]);
	    return 0;
	}
	if (*(args[1]) == 0) {
	    Alert("parsing [%s:%d] : '%s' expects an integer argument.\n", file, linenum, args[0]);
	    return -1;
	}
	global.maxconn = atol(args[1]);
#ifdef SYSTEM_MAXCONN
	if (global.maxconn > DEFAULT_MAXCONN && cfg_maxconn <= DEFAULT_MAXCONN) {
	    Alert("parsing [%s:%d] : maxconn value %d too high for this system.\nLimiting to %d. Please use '-n' to force the value.\n", file, linenum, global.maxconn, DEFAULT_MAXCONN);
	    global.maxconn = DEFAULT_MAXCONN;
	}
#endif /* SYSTEM_MAXCONN */
    }
    else if (!strcmp(args[0], "ulimit-n")) {
	if (global.rlimit_nofile != 0) {
	    Alert("parsing [%s:%d] : '%s' already specified. Continuing.\n", file, linenum, args[0]);
	    return 0;
	}
	if (*(args[1]) == 0) {
	    Alert("parsing [%s:%d] : '%s' expects an integer argument.\n", file, linenum, args[0]);
	    return -1;
	}
	global.rlimit_nofile = atol(args[1]);
    }
    else if (!strcmp(args[0], "chroot")) {
	if (global.chroot != NULL) {
	    Alert("parsing [%s:%d] : '%s' already specified. Continuing.\n", file, linenum, args[0]);
	    return 0;
	}
	if (*(args[1]) == 0) {
	    Alert("parsing [%s:%d] : '%s' expects a directory as an argument.\n", file, linenum, args[0]);
	    return -1;
	}
	global.chroot = strdup(args[1]);
    }
    else if (!strcmp(args[0], "pidfile")) {
	if (global.pidfile != NULL) {
	    Alert("parsing [%s:%d] : '%s' already specified. Continuing.\n", file, linenum, args[0]);
	    return 0;
	}
	if (*(args[1]) == 0) {
	    Alert("parsing [%s:%d] : '%s' expects a file name as an argument.\n", file, linenum, args[0]);
	    return -1;
	}
	global.pidfile = strdup(args[1]);
    }
    else if (!strcmp(args[0], "log")) {  /* syslog server address */
	struct sockaddr_in *sa;
	int facility, level;
	
	if (*(args[1]) == 0 || *(args[2]) == 0) {
	    Alert("parsing [%s:%d] : '%s' expects <address> and <facility> as arguments.\n", file, linenum, args[0]);
	    return -1;
	}
	
	for (facility = 0; facility < NB_LOG_FACILITIES; facility++)
	    if (!strcmp(log_facilities[facility], args[2]))
		break;
	
	if (facility >= NB_LOG_FACILITIES) {
	    Alert("parsing [%s:%d] : unknown log facility '%s'\n", file, linenum, args[2]);
	    exit(1);
	}

	level = 7; /* max syslog level = debug */
	if (*(args[3])) {
	    while (level >= 0 && strcmp(log_levels[level], args[3]))
		level--;
	    if (level < 0) {
		Alert("parsing [%s:%d] : unknown optional log level '%s'\n", file, linenum, args[3]);
		exit(1);
	    }
	}

	sa = str2sa(args[1]);
	if (!sa->sin_port)
	    sa->sin_port = htons(SYSLOG_PORT);

	if (global.logfac1 == -1) {
	    global.logsrv1 = *sa;
	    global.logfac1 = facility;
	    global.loglev1 = level;
	}
	else if (global.logfac2 == -1) {
	    global.logsrv2 = *sa;
	    global.logfac2 = facility;
	    global.loglev2 = level;
	}
	else {
	    Alert("parsing [%s:%d] : too many syslog servers\n", file, linenum);
	    return -1;
	}
	
    }
    else {
	Alert("parsing [%s:%d] : unknown keyword '%s' in '%s' section\n", file, linenum, args[0], "global");
	return -1;
    }
    return 0;
}


void init_default_instance() {
    memset(&defproxy, 0, sizeof(defproxy));
    defproxy.mode = PR_MODE_TCP;
    defproxy.state = PR_STNEW;
    defproxy.maxconn = cfg_maxpconn;
    defproxy.conn_retries = CONN_RETRIES;
    defproxy.logfac1 = defproxy.logfac2 = -1; /* log disabled */
}

/*
 * parse a line in a <listen> section. Returns 0 if OK, -1 if error.
 */
int cfg_parse_listen(char *file, int linenum, char **args) {
    static struct proxy *curproxy = NULL;
    struct server *newsrv = NULL;
    char *err;
    int rc;

    if (!strcmp(args[0], "listen")) {  /* new proxy */
	if (!*args[1]) {
	    Alert("parsing [%s:%d] : '%s' expects an <id> argument and\n"
		  "  optionnally supports [addr1]:port1[-end1]{,[addr]:port[-end]}...\n",
		  file, linenum, args[0]);
	    return -1;
	}
	
	if ((curproxy = (struct proxy *)calloc(1, sizeof(struct proxy))) == NULL) {
	    Alert("parsing [%s:%d] : out of memory.\n", file, linenum);
	    return -1;
	}
	
	curproxy->next = proxy;
	proxy = curproxy;
	LIST_INIT(&curproxy->pendconns);

	curproxy->id = strdup(args[1]);

	/* parse the listener address if any */
	if (*args[2]) {
	    curproxy->listen = str2listener(args[2], curproxy->listen);
	    if (!curproxy->listen)
		return -1;
	    global.maxsock++;
	}

	/* set default values */
	curproxy->state = defproxy.state;
	curproxy->maxconn = defproxy.maxconn;
	curproxy->conn_retries = defproxy.conn_retries;
	curproxy->options = defproxy.options;

	if (defproxy.check_req)
	    curproxy->check_req = strdup(defproxy.check_req);
	curproxy->check_len = defproxy.check_len;

	if (defproxy.cookie_name)
	    curproxy->cookie_name = strdup(defproxy.cookie_name);
	curproxy->cookie_len = defproxy.cookie_len;

	if (defproxy.capture_name)
	    curproxy->capture_name = strdup(defproxy.capture_name);
	curproxy->capture_namelen = defproxy.capture_namelen;
	curproxy->capture_len = defproxy.capture_len;

	if (defproxy.errmsg.msg400)
	    curproxy->errmsg.msg400 = strdup(defproxy.errmsg.msg400);
	curproxy->errmsg.len400 = defproxy.errmsg.len400;

	if (defproxy.errmsg.msg403)
	    curproxy->errmsg.msg403 = strdup(defproxy.errmsg.msg403);
	curproxy->errmsg.len403 = defproxy.errmsg.len403;

	if (defproxy.errmsg.msg408)
	    curproxy->errmsg.msg408 = strdup(defproxy.errmsg.msg408);
	curproxy->errmsg.len408 = defproxy.errmsg.len408;

	if (defproxy.errmsg.msg500)
	    curproxy->errmsg.msg500 = strdup(defproxy.errmsg.msg500);
	curproxy->errmsg.len500 = defproxy.errmsg.len500;

	if (defproxy.errmsg.msg502)
	    curproxy->errmsg.msg502 = strdup(defproxy.errmsg.msg502);
	curproxy->errmsg.len502 = defproxy.errmsg.len502;

	if (defproxy.errmsg.msg503)
	    curproxy->errmsg.msg503 = strdup(defproxy.errmsg.msg503);
	curproxy->errmsg.len503 = defproxy.errmsg.len503;

	if (defproxy.errmsg.msg504)
	    curproxy->errmsg.msg504 = strdup(defproxy.errmsg.msg504);
	curproxy->errmsg.len504 = defproxy.errmsg.len504;

	curproxy->clitimeout = defproxy.clitimeout;
	curproxy->contimeout = defproxy.contimeout;
	curproxy->srvtimeout = defproxy.srvtimeout;
	curproxy->mode = defproxy.mode;
	curproxy->logfac1 = defproxy.logfac1;
	curproxy->logsrv1 = defproxy.logsrv1;
	curproxy->loglev1 = defproxy.loglev1;
	curproxy->logfac2 = defproxy.logfac2;
	curproxy->logsrv2 = defproxy.logsrv2;
	curproxy->loglev2 = defproxy.loglev2;
	curproxy->to_log = defproxy.to_log & ~LW_COOKIE & ~LW_REQHDR & ~ LW_RSPHDR;
	curproxy->grace  = defproxy.grace;
	curproxy->source_addr = defproxy.source_addr;
	curproxy->mon_net = defproxy.mon_net;
	curproxy->mon_mask = defproxy.mon_mask;
	return 0;
    }
    else if (!strcmp(args[0], "defaults")) {  /* use this one to assign default values */
	/* some variables may have already been initialized earlier */
	if (defproxy.check_req)     free(defproxy.check_req);
	if (defproxy.cookie_name)   free(defproxy.cookie_name);
	if (defproxy.capture_name)  free(defproxy.capture_name);
	if (defproxy.errmsg.msg400) free(defproxy.errmsg.msg400);
	if (defproxy.errmsg.msg403) free(defproxy.errmsg.msg403);
	if (defproxy.errmsg.msg408) free(defproxy.errmsg.msg408);
	if (defproxy.errmsg.msg500) free(defproxy.errmsg.msg500);
	if (defproxy.errmsg.msg502) free(defproxy.errmsg.msg502);
	if (defproxy.errmsg.msg503) free(defproxy.errmsg.msg503);
	if (defproxy.errmsg.msg504) free(defproxy.errmsg.msg504);

	init_default_instance();
	curproxy = &defproxy;
	return 0;
    }
    else if (curproxy == NULL) {
	Alert("parsing [%s:%d] : 'listen' or 'defaults' expected.\n", file, linenum);
	return -1;
    }
    
    if (!strcmp(args[0], "bind")) {  /* new listen addresses */
	if (curproxy == &defproxy) {
	    Alert("parsing [%s:%d] : '%s' not allowed in 'defaults' section.\n", file, linenum, args[0]);
	    return -1;
	}

	if (strchr(args[1], ':') == NULL) {
	    Alert("parsing [%s:%d] : '%s' expects [addr1]:port1[-end1]{,[addr]:port[-end]}... as arguments.\n",
		  file, linenum, args[0]);
	    return -1;
	}
	curproxy->listen = str2listener(args[1], curproxy->listen);
	if (!curproxy->listen)
	    return -1;
	global.maxsock++;
	return 0;
    }
    else if (!strcmp(args[0], "monitor-net")) {  /* set the range of IPs to ignore */
	if (!*args[1] || !str2net(args[1], &curproxy->mon_net, &curproxy->mon_mask)) {
	    Alert("parsing [%s:%d] : '%s' expects address[/mask].\n",
		  file, linenum, args[0]);
	    return -1;
	}
	/* flush useless bits */
	curproxy->mon_net.s_addr &= curproxy->mon_mask.s_addr;
	return 0;
    }
    else if (!strcmp(args[0], "mode")) {  /* sets the proxy mode */
	if (!strcmp(args[1], "http")) curproxy->mode = PR_MODE_HTTP;
	else if (!strcmp(args[1], "tcp")) curproxy->mode = PR_MODE_TCP;
	else if (!strcmp(args[1], "health")) curproxy->mode = PR_MODE_HEALTH;
	else {
	    Alert("parsing [%s:%d] : unknown proxy mode '%s'.\n", file, linenum, args[1]);
	    return -1;
	}
    }
    else if (!strcmp(args[0], "disabled")) {  /* disables this proxy */
	curproxy->state = PR_STSTOPPED;
    }
    else if (!strcmp(args[0], "enabled")) {  /* enables this proxy (used to revert a disabled default) */
	curproxy->state = PR_STNEW;
    }
    else if (!strcmp(args[0], "cookie")) {  /* cookie name */
	int cur_arg;
//	  if (curproxy == &defproxy) {
//	      Alert("parsing [%s:%d] : '%s' not allowed in 'defaults' section.\n", file, linenum, args[0]);
//	      return -1;
//	  }

	if (curproxy->cookie_name != NULL) {
//	      Alert("parsing [%s:%d] : cookie name already specified. Continuing.\n",
//		    file, linenum);
//	      return 0;
	    free(curproxy->cookie_name);
	}
	
	if (*(args[1]) == 0) {
	    Alert("parsing [%s:%d] : '%s' expects <cookie_name> as argument.\n",
		  file, linenum, args[0]);
	    return -1;
	}
	curproxy->cookie_name = strdup(args[1]);
	curproxy->cookie_len = strlen(curproxy->cookie_name);
	
	cur_arg = 2;
	while (*(args[cur_arg])) {
	    if (!strcmp(args[cur_arg], "rewrite")) {
		curproxy->options |= PR_O_COOK_RW;
	    }
	    else if (!strcmp(args[cur_arg], "indirect")) {
		curproxy->options |= PR_O_COOK_IND;
	    }
	    else if (!strcmp(args[cur_arg], "insert")) {
		curproxy->options |= PR_O_COOK_INS;
	    }
	    else if (!strcmp(args[cur_arg], "nocache")) {
		curproxy->options |= PR_O_COOK_NOC;
	    }
	    else if (!strcmp(args[cur_arg], "postonly")) {
		curproxy->options |= PR_O_COOK_POST;
	    }
	    else if (!strcmp(args[cur_arg], "prefix")) {
		curproxy->options |= PR_O_COOK_PFX;
	    }
	    else {
		Alert("parsing [%s:%d] : '%s' supports 'rewrite', 'insert', 'prefix', 'indirect', 'nocache' and 'postonly' options.\n",
		      file, linenum, args[0]);
		return -1;
	    }
	    cur_arg++;
	}
	if (!POWEROF2(curproxy->options & (PR_O_COOK_RW|PR_O_COOK_IND))) {
	    Alert("parsing [%s:%d] : cookie 'rewrite' and 'indirect' modes are incompatible.\n",
		  file, linenum);
	    return -1;
	}

	if (!POWEROF2(curproxy->options & (PR_O_COOK_RW|PR_O_COOK_INS|PR_O_COOK_PFX))) {
	    Alert("parsing [%s:%d] : cookie 'rewrite', 'insert' and 'prefix' modes are incompatible.\n",
		  file, linenum);
	    return -1;
	}
    }/* end else if (!strcmp(args[0], "cookie"))  */
    else if (!strcmp(args[0], "appsession")) {  /* cookie name */
//	  if (curproxy == &defproxy) {
//	      Alert("parsing [%s:%d] : '%s' not allowed in 'defaults' section.\n", file, linenum, args[0]);
//	      return -1;
//	  }

	if (curproxy->appsession_name != NULL) {
//	      Alert("parsing [%s:%d] : cookie name already specified. Continuing.\n",
//		    file, linenum);
//	      return 0;
	    free(curproxy->appsession_name);
	}
	
	if (*(args[5]) == 0) {
	  Alert("parsing [%s:%d] : '%s' expects 'appsession' <cookie_name> 'len' <len> 'timeout' <timeout>.\n",
		file, linenum, args[0]);
	  return -1;
	}
	have_appsession = 1;
	curproxy->appsession_name = strdup(args[1]);
	curproxy->appsession_name_len = strlen(curproxy->appsession_name);
	curproxy->appsession_len = atoi(args[3]);
	curproxy->appsession_timeout = atoi(args[5]);
	rc = chtbl_init(&(curproxy->htbl_proxy), TBLSIZ, hashpjw, match_str, destroy);
	if (rc) {
	    Alert("Error Init Appsession Hashtable.\n");
	    return -1;
	}
    } /* Url App Session */
    else if (!strcmp(args[0], "capture")) {
	if (!strcmp(args[1], "cookie")) {  /* name of a cookie to capture */
	    //	  if (curproxy == &defproxy) {
	    //	      Alert("parsing [%s:%d] : '%s' not allowed in 'defaults' section.\n", file, linenum, args[0]);
	    //	      return -1;
	    //	  }

	    if (curproxy->capture_name != NULL) {
		//     Alert("parsing [%s:%d] : '%s' already specified. Continuing.\n",
		//           file, linenum, args[0]);
		//     return 0;
		free(curproxy->capture_name);
	    }
	
	    if (*(args[4]) == 0) {
		Alert("parsing [%s:%d] : '%s' expects 'cookie' <cookie_name> 'len' <len>.\n",
		      file, linenum, args[0]);
		return -1;
	    }
	    curproxy->capture_name = strdup(args[2]);
	    curproxy->capture_namelen = strlen(curproxy->capture_name);
	    curproxy->capture_len = atol(args[4]);
	    if (curproxy->capture_len >= CAPTURE_LEN) {
		Warning("parsing [%s:%d] : truncating capture length to %d bytes.\n",
			file, linenum, CAPTURE_LEN - 1);
		curproxy->capture_len = CAPTURE_LEN - 1;
	    }
	    curproxy->to_log |= LW_COOKIE;
	}
	else if (!strcmp(args[1], "request") && !strcmp(args[2], "header")) {
	    struct cap_hdr *hdr;

	    if (curproxy == &defproxy) {
		Alert("parsing [%s:%d] : '%s %s' not allowed in 'defaults' section.\n", file, linenum, args[0], args[1]);
		return -1;
	    }

	    if (*(args[3]) == 0 || strcmp(args[4], "len") != 0 || *(args[5]) == 0) {
		Alert("parsing [%s:%d] : '%s %s' expects 'header' <header_name> 'len' <len>.\n",
		      file, linenum, args[0], args[1]);
		return -1;
	    }

	    hdr = calloc(sizeof(struct cap_hdr), 1);
	    hdr->next = curproxy->req_cap;
	    hdr->name = strdup(args[3]);
	    hdr->namelen = strlen(args[3]);
	    hdr->len = atol(args[5]);
	    hdr->index = curproxy->nb_req_cap++;
	    curproxy->req_cap = hdr;
	    curproxy->to_log |= LW_REQHDR;
	}
	else if (!strcmp(args[1], "response") && !strcmp(args[2], "header")) {
	    struct cap_hdr *hdr;

	    if (curproxy == &defproxy) {
		Alert("parsing [%s:%d] : '%s %s' not allowed in 'defaults' section.\n", file, linenum, args[0], args[1]);
		return -1;
	    }

	    if (*(args[3]) == 0 || strcmp(args[4], "len") != 0 || *(args[5]) == 0) {
		Alert("parsing [%s:%d] : '%s %s' expects 'header' <header_name> 'len' <len>.\n",
		      file, linenum, args[0], args[1]);
		return -1;
	    }
	    hdr = calloc(sizeof(struct cap_hdr), 1);
	    hdr->next = curproxy->rsp_cap;
	    hdr->name = strdup(args[3]);
	    hdr->namelen = strlen(args[3]);
	    hdr->len = atol(args[5]);
	    hdr->index = curproxy->nb_rsp_cap++;
	    curproxy->rsp_cap = hdr;
	    curproxy->to_log |= LW_RSPHDR;
	}
	else {
	    Alert("parsing [%s:%d] : '%s' expects 'cookie' or 'request header' or 'response header'.\n",
		  file, linenum, args[0]);
	    return -1;
	}
    }
    else if (!strcmp(args[0], "contimeout")) {  /* connect timeout */
	if (curproxy->contimeout != defproxy.contimeout) {
	    Alert("parsing [%s:%d] : '%s' already specified. Continuing.\n", file, linenum, args[0]);
	    return 0;
	}
	if (*(args[1]) == 0) {
	    Alert("parsing [%s:%d] : '%s' expects an integer <time_in_ms> as argument.\n",
		  file, linenum, args[0]);
	    return -1;
	}
	curproxy->contimeout = atol(args[1]);
    }
    else if (!strcmp(args[0], "clitimeout")) {  /*  client timeout */
	if (curproxy->clitimeout != defproxy.clitimeout) {
	    Alert("parsing [%s:%d] : '%s' already specified. Continuing.\n",
		  file, linenum, args[0]);
	    return 0;
	}
	if (*(args[1]) == 0) {
	    Alert("parsing [%s:%d] : '%s' expects an integer <time_in_ms> as argument.\n",
		  file, linenum, args[0]);
	    return -1;
	}
	curproxy->clitimeout = atol(args[1]);
    }
    else if (!strcmp(args[0], "srvtimeout")) {  /*  server timeout */
	if (curproxy->srvtimeout != defproxy.srvtimeout) {
	    Alert("parsing [%s:%d] : '%s' already specified. Continuing.\n", file, linenum, args[0]);
	    return 0;
	}
	if (*(args[1]) == 0) {
		Alert("parsing [%s:%d] : '%s' expects an integer <time_in_ms> as argument.\n",
		      file, linenum, args[0]);
		return -1;
	}
	curproxy->srvtimeout = atol(args[1]);
    }
    else if (!strcmp(args[0], "retries")) {  /* connection retries */
	if (*(args[1]) == 0) {
	    Alert("parsing [%s:%d] : '%s' expects an integer argument (dispatch counts for one).\n",
		  file, linenum, args[0]);
	    return -1;
	}
	curproxy->conn_retries = atol(args[1]);
    }
    else if (!strcmp(args[0], "option")) {
	if (*(args[1]) == 0) {
	    Alert("parsing [%s:%d] : '%s' expects an option name.\n", file, linenum, args[0]);
	    return -1;
	}
	if (!strcmp(args[1], "redispatch"))
	    /* enable reconnections to dispatch */
	    curproxy->options |= PR_O_REDISP;
#ifdef TPROXY
	else if (!strcmp(args[1], "transparent"))
	    /* enable transparent proxy connections */
	    curproxy->options |= PR_O_TRANSP;
#endif
	else if (!strcmp(args[1], "keepalive"))
	    /* enable keep-alive */
	    curproxy->options |= PR_O_KEEPALIVE;
	else if (!strcmp(args[1], "forwardfor"))
	    /* insert x-forwarded-for field */
	    curproxy->options |= PR_O_FWDFOR;
	else if (!strcmp(args[1], "logasap"))
	    /* log as soon as possible, without waiting for the session to complete */
	    curproxy->options |= PR_O_LOGASAP;
	else if (!strcmp(args[1], "httpclose"))
	    /* force connection: close in both directions in HTTP mode */
	    curproxy->options |= PR_O_HTTP_CLOSE;
	else if (!strcmp(args[1], "forceclose"))
	    /* force connection: close in both directions in HTTP mode and enforce end of session */
	    curproxy->options |= PR_O_FORCE_CLO | PR_O_HTTP_CLOSE;
	else if (!strcmp(args[1], "checkcache"))
	    /* require examination of cacheability of the 'set-cookie' field */
	    curproxy->options |= PR_O_CHK_CACHE;
	else if (!strcmp(args[1], "httplog"))
	    /* generate a complete HTTP log */
	    curproxy->to_log |= LW_DATE | LW_CLIP | LW_SVID | LW_REQ | LW_PXID | LW_RESP | LW_BYTES;
	else if (!strcmp(args[1], "tcplog"))
	    /* generate a detailed TCP log */
	    curproxy->to_log |= LW_DATE | LW_CLIP | LW_SVID | LW_PXID | LW_BYTES;
	else if (!strcmp(args[1], "dontlognull")) {
	    /* don't log empty requests */
	    curproxy->options |= PR_O_NULLNOLOG;
	}
	else if (!strcmp(args[1], "tcpka")) {
	    /* enable TCP keep-alives on client and server sessions */
	    curproxy->options |= PR_O_TCP_CLI_KA | PR_O_TCP_SRV_KA;
	}
	else if (!strcmp(args[1], "clitcpka")) {
	    /* enable TCP keep-alives on client sessions */
	    curproxy->options |= PR_O_TCP_CLI_KA;
	}
	else if (!strcmp(args[1], "srvtcpka")) {
	    /* enable TCP keep-alives on server sessions */
	    curproxy->options |= PR_O_TCP_SRV_KA;
	}
	else if (!strcmp(args[1], "allbackups")) {
	    /* Use all backup servers simultaneously */
	    curproxy->options |= PR_O_USE_ALL_BK;
	}
	else if (!strcmp(args[1], "httpchk")) {
	    /* use HTTP request to check servers' health */
	    if (curproxy->check_req != NULL) {
		free(curproxy->check_req);
	    }
	    curproxy->options |= PR_O_HTTP_CHK;
	    if (!*args[2]) { /* no argument */
		curproxy->check_req = strdup(DEF_CHECK_REQ); /* default request */
		curproxy->check_len = strlen(DEF_CHECK_REQ);
	    } else if (!*args[3]) { /* one argument : URI */
		int reqlen = strlen(args[2]) + strlen("OPTIONS / HTTP/1.0\r\n\r\n");
		curproxy->check_req = (char *)malloc(reqlen);
		curproxy->check_len = snprintf(curproxy->check_req, reqlen,
			 "OPTIONS %s HTTP/1.0\r\n\r\n", args[2]); /* URI to use */
	    } else { /* more arguments : METHOD URI [HTTP_VER] */
		int reqlen = strlen(args[2]) + strlen(args[3]) + 3 + strlen("\r\n\r\n");
		if (*args[4])
		    reqlen += strlen(args[4]);
		else
		    reqlen += strlen("HTTP/1.0");
		    
		curproxy->check_req = (char *)malloc(reqlen);
		curproxy->check_len = snprintf(curproxy->check_req, reqlen,
			 "%s %s %s\r\n\r\n", args[2], args[3], *args[4]?args[4]:"HTTP/1.0");
	    }
	}
	else if (!strcmp(args[1], "persist")) {
	    /* persist on using the server specified by the cookie, even when it's down */
	    curproxy->options |= PR_O_PERSIST;
	}
	else {
	    Alert("parsing [%s:%d] : unknown option '%s'.\n", file, linenum, args[1]);
	    return -1;
	}
	return 0;
    }
    else if (!strcmp(args[0], "redispatch") || !strcmp(args[0], "redisp")) {
	/* enable reconnections to dispatch */
	curproxy->options |= PR_O_REDISP;
    }
#ifdef TPROXY
    else if (!strcmp(args[0], "transparent")) {
	/* enable transparent proxy connections */
	curproxy->options |= PR_O_TRANSP;
    }
#endif
    else if (!strcmp(args[0], "maxconn")) {  /* maxconn */
	if (*(args[1]) == 0) {
	    Alert("parsing [%s:%d] : '%s' expects an integer argument.\n", file, linenum, args[0]);
	    return -1;
	}
	curproxy->maxconn = atol(args[1]);
    }
    else if (!strcmp(args[0], "grace")) {  /* grace time (ms) */
	if (*(args[1]) == 0) {
	    Alert("parsing [%s:%d] : '%s' expects a time in milliseconds.\n", file, linenum, args[0]);
	    return -1;
	}
	curproxy->grace = atol(args[1]);
    }
    else if (!strcmp(args[0], "dispatch")) {  /* dispatch address */
	if (curproxy == &defproxy) {
	    Alert("parsing [%s:%d] : '%s' not allowed in 'defaults' section.\n", file, linenum, args[0]);
	    return -1;
	}
	if (strchr(args[1], ':') == NULL) {
	    Alert("parsing [%s:%d] : '%s' expects <addr:port> as argument.\n", file, linenum, args[0]);
	    return -1;
	}
	curproxy->dispatch_addr = *str2sa(args[1]);
    }
    else if (!strcmp(args[0], "balance")) {  /* set balancing with optional algorithm */
	if (*(args[1])) {
	    if (!strcmp(args[1], "roundrobin")) {
		curproxy->options |= PR_O_BALANCE_RR;
	    }
	    else if (!strcmp(args[1], "source")) {
		curproxy->options |= PR_O_BALANCE_SH;
	    }
	    else {
		Alert("parsing [%s:%d] : '%s' only supports 'roundrobin' and 'source' options.\n", file, linenum, args[0]);
		return -1;
	    }
	}
	else /* if no option is set, use round-robin by default */
	    curproxy->options |= PR_O_BALANCE_RR;
    }
    else if (!strcmp(args[0], "server")) {  /* server address */
	int cur_arg;
	char *rport;
	char *raddr;
	short realport;
	int do_check;

	if (curproxy == &defproxy) {
	    Alert("parsing [%s:%d] : '%s' not allowed in 'defaults' section.\n", file, linenum, args[0]);
	    return -1;
	}

	if (!*args[2]) {
	    Alert("parsing [%s:%d] : '%s' expects <name> and <addr>[:<port>] as arguments.\n",
		  file, linenum, args[0]);
	    return -1;
	}
	if ((newsrv = (struct server *)calloc(1, sizeof(struct server))) == NULL) {
	    Alert("parsing [%s:%d] : out of memory.\n", file, linenum);
	    return -1;
	}

	/* the servers are linked backwards first */
	newsrv->next = curproxy->srv;
	curproxy->srv = newsrv;
	newsrv->proxy = curproxy;

	LIST_INIT(&newsrv->pendconns);
	do_check = 0;
	newsrv->state = SRV_RUNNING; /* early server setup */
	newsrv->id = strdup(args[1]);

	/* several ways to check the port component :
	 *  - IP    => port=+0, relative
	 *  - IP:   => port=+0, relative
	 *  - IP:N  => port=N, absolute
	 *  - IP:+N => port=+N, relative
	 *  - IP:-N => port=-N, relative
	 */
	raddr = strdup(args[2]);
	rport = strchr(raddr, ':');
	if (rport) {
	    *rport++ = 0;
	    realport = atol(rport);
	    if (!isdigit((int)*rport))
		newsrv->state |= SRV_MAPPORTS;
	} else {
	    realport = 0;
	    newsrv->state |= SRV_MAPPORTS;
	}	    

	newsrv->addr = *str2sa(raddr);
	newsrv->addr.sin_port = htons(realport);
	free(raddr);

	newsrv->curfd = -1; /* no health-check in progress */
	newsrv->inter = DEF_CHKINTR;
	newsrv->rise = DEF_RISETIME;
	newsrv->fall = DEF_FALLTIME;
	newsrv->health = newsrv->rise; /* up, but will fall down at first failure */
	cur_arg = 3;
	while (*args[cur_arg]) {
	    if (!strcmp(args[cur_arg], "cookie")) {
		newsrv->cookie = strdup(args[cur_arg + 1]);
		newsrv->cklen = strlen(args[cur_arg + 1]);
		cur_arg += 2;
	    }
	    else if (!strcmp(args[cur_arg], "rise")) {
		newsrv->rise = atol(args[cur_arg + 1]);
		newsrv->health = newsrv->rise;
		cur_arg += 2;
	    }
	    else if (!strcmp(args[cur_arg], "fall")) {
		newsrv->fall = atol(args[cur_arg + 1]);
		cur_arg += 2;
	    }
	    else if (!strcmp(args[cur_arg], "inter")) {
		newsrv->inter = atol(args[cur_arg + 1]);
		cur_arg += 2;
	    }
	    else if (!strcmp(args[cur_arg], "port")) {
		newsrv->check_port = atol(args[cur_arg + 1]);
		cur_arg += 2;
	    }
	    else if (!strcmp(args[cur_arg], "backup")) {
		newsrv->state |= SRV_BACKUP;
		cur_arg ++;
	    }
	    else if (!strcmp(args[cur_arg], "weight")) {
		int w;
		w = atol(args[cur_arg + 1]);
		if (w < 1 || w > 256) {
		    Alert("parsing [%s:%d] : weight of server %s is not within 1 and 256 (%d).\n",
			  file, linenum, newsrv->id, w);
		    return -1;
		}
		newsrv->uweight = w - 1;
		cur_arg += 2;
	    }
	    else if (!strcmp(args[cur_arg], "maxconn")) {
		newsrv->maxconn = atol(args[cur_arg + 1]);
		cur_arg += 2;
	    }
	    else if (!strcmp(args[cur_arg], "check")) {
		global.maxsock++;
		do_check = 1;
		cur_arg += 1;
	    }
	    else if (!strcmp(args[cur_arg], "source")) {  /* address to which we bind when connecting */
		if (!*args[cur_arg + 1]) {
		    Alert("parsing [%s:%d] : '%s' expects <addr>[:<port>] as argument.\n",
			  file, linenum, "source");
		    return -1;
		}
		newsrv->state |= SRV_BIND_SRC;
		newsrv->source_addr = *str2sa(args[cur_arg + 1]);
		cur_arg += 2;
	    }
	    else {
		Alert("parsing [%s:%d] : server %s only supports options 'backup', 'cookie', 'check', 'inter', 'rise', 'fall', 'port', 'source', and 'weight'.\n",
		      file, linenum, newsrv->id);
		return -1;
	    }
	}

	if (do_check) {
	    if (!newsrv->check_port && !(newsrv->state & SRV_MAPPORTS))
		newsrv->check_port = realport; /* by default */
	    if (!newsrv->check_port) {
		Alert("parsing [%s:%d] : server %s has neither service port nor check port. Check has been disabled.\n",
		      file, linenum, newsrv->id);
		return -1;
	    }
	    newsrv->state |= SRV_CHECKED;
	}

	if (newsrv->state & SRV_BACKUP)
	    curproxy->srv_bck++;
	else
	    curproxy->srv_act++;
    }
    else if (!strcmp(args[0], "log")) {  /* syslog server address */
	struct sockaddr_in *sa;
	int facility;
	
	if (*(args[1]) && *(args[2]) == 0 && !strcmp(args[1], "global")) {
	    curproxy->logfac1 = global.logfac1;
	    curproxy->logsrv1 = global.logsrv1;
	    curproxy->loglev1 = global.loglev1;
	    curproxy->logfac2 = global.logfac2;
	    curproxy->logsrv2 = global.logsrv2;
	    curproxy->loglev2 = global.loglev2;
	}
	else if (*(args[1]) && *(args[2])) {
	    int level;

	    for (facility = 0; facility < NB_LOG_FACILITIES; facility++)
		if (!strcmp(log_facilities[facility], args[2]))
		    break;
	
	    if (facility >= NB_LOG_FACILITIES) {
		Alert("parsing [%s:%d] : unknown log facility '%s'\n", file, linenum, args[2]);
		exit(1);
	    }
	    
	    level = 7; /* max syslog level = debug */
	    if (*(args[3])) {
		while (level >= 0 && strcmp(log_levels[level], args[3]))
		     level--;
		if (level < 0) {
		    Alert("parsing [%s:%d] : unknown optional log level '%s'\n", file, linenum, args[3]);
		    exit(1);
		}
	    }

	    sa = str2sa(args[1]);
	    if (!sa->sin_port)
		sa->sin_port = htons(SYSLOG_PORT);
	    
	    if (curproxy->logfac1 == -1) {
		curproxy->logsrv1 = *sa;
		curproxy->logfac1 = facility;
		curproxy->loglev1 = level;
	    }
	    else if (curproxy->logfac2 == -1) {
		curproxy->logsrv2 = *sa;
		curproxy->logfac2 = facility;
		curproxy->loglev2 = level;
	    }
	    else {
		Alert("parsing [%s:%d] : too many syslog servers\n", file, linenum);
		return -1;
	    }
	}
	else {
	    Alert("parsing [%s:%d] : 'log' expects either <address[:port]> and <facility> or 'global' as arguments.\n",
		  file, linenum);
	    return -1;
	}
    }
    else if (!strcmp(args[0], "source")) {  /* address to which we bind when connecting */
	if (!*args[1]) {
	    Alert("parsing [%s:%d] : '%s' expects <addr>[:<port>] as argument.\n",
		  file, linenum, "source");
	    return -1;
	}
	
	curproxy->source_addr = *str2sa(args[1]);
	curproxy->options |= PR_O_BIND_SRC;
    }
    else if (!strcmp(args[0], "cliexp") || !strcmp(args[0], "reqrep")) {  /* replace request header from a regex */
	regex_t *preg;
	if (curproxy == &defproxy) {
	    Alert("parsing [%s:%d] : '%s' not allowed in 'defaults' section.\n", file, linenum, args[0]);
	    return -1;
	}
	
	if (*(args[1]) == 0 || *(args[2]) == 0) {
	    Alert("parsing [%s:%d] : '%s' expects <search> and <replace> as arguments.\n",
		  file, linenum, args[0]);
	    return -1;
	}
	
	preg = calloc(1, sizeof(regex_t));
	if (regcomp(preg, args[1], REG_EXTENDED) != 0) {
	    Alert("parsing [%s:%d] : bad regular expression '%s'.\n", file, linenum, args[1]);
	    return -1;
	}
	
	err = chain_regex(&curproxy->req_exp, preg, ACT_REPLACE, strdup(args[2]));
	if (err) {
	    Alert("parsing [%s:%d] : invalid character or unterminated sequence in replacement string near '%c'.\n",
		  file, linenum, *err);
	    return -1;
	}
    }
    else if (!strcmp(args[0], "reqdel")) {  /* delete request header from a regex */
	regex_t *preg;
	if (curproxy == &defproxy) {
	    Alert("parsing [%s:%d] : '%s' not allowed in 'defaults' section.\n", file, linenum, args[0]);
	    return -1;
	}
	
	if (*(args[1]) == 0) {
	    Alert("parsing [%s:%d] : '%s' expects <regex> as an argument.\n", file, linenum, args[0]);
	    return -1;
	}
	
	preg = calloc(1, sizeof(regex_t));
	if (regcomp(preg, args[1], REG_EXTENDED) != 0) {
	    Alert("parsing [%s:%d] : bad regular expression '%s'.\n", file, linenum, args[1]);
	    return -1;
	}
	
	chain_regex(&curproxy->req_exp, preg, ACT_REMOVE, NULL);
    }
    else if (!strcmp(args[0], "reqdeny")) {  /* deny a request if a header matches this regex */
	regex_t *preg;
	if (curproxy == &defproxy) {
	    Alert("parsing [%s:%d] : '%s' not allowed in 'defaults' section.\n", file, linenum, args[0]);
	    return -1;
	}
	
	if (*(args[1]) == 0) {
	    Alert("parsing [%s:%d] : '%s' expects <regex> as an argument.\n", file, linenum, args[0]);
	    return -1;
	}
	
	preg = calloc(1, sizeof(regex_t));
	if (regcomp(preg, args[1], REG_EXTENDED) != 0) {
	    Alert("parsing [%s:%d] : bad regular expression '%s'.\n", file, linenum, args[1]);
	    return -1;
	}
	
	chain_regex(&curproxy->req_exp, preg, ACT_DENY, NULL);
    }
    else if (!strcmp(args[0], "reqpass")) {  /* pass this header without allowing or denying the request */
	regex_t *preg;
	if (curproxy == &defproxy) {
	    Alert("parsing [%s:%d] : '%s' not allowed in 'defaults' section.\n", file, linenum, args[0]);
	    return -1;
	}
	
	if (*(args[1]) == 0) {
	    Alert("parsing [%s:%d] : '%s' expects <regex> as an argument.\n", file, linenum, args[0]);
	    return -1;
	}
	
	preg = calloc(1, sizeof(regex_t));
	if (regcomp(preg, args[1], REG_EXTENDED) != 0) {
	    Alert("parsing [%s:%d] : bad regular expression '%s'.\n", file, linenum, args[1]);
	    return -1;
	}
	
	chain_regex(&curproxy->req_exp, preg, ACT_PASS, NULL);
    }
    else if (!strcmp(args[0], "reqallow")) {  /* allow a request if a header matches this regex */
	regex_t *preg;
	if (curproxy == &defproxy) {
	    Alert("parsing [%s:%d] : '%s' not allowed in 'defaults' section.\n", file, linenum, args[0]);
	    return -1;
	}
	
	if (*(args[1]) == 0) {
	    Alert("parsing [%s:%d] : '%s' expects <regex> as an argument.\n", file, linenum, args[0]);
	    return -1;
	}
	
	preg = calloc(1, sizeof(regex_t));
	if (regcomp(preg, args[1], REG_EXTENDED) != 0) {
	    Alert("parsing [%s:%d] : bad regular expression '%s'.\n", file, linenum, args[1]);
	    return -1;
	}
	
	chain_regex(&curproxy->req_exp, preg, ACT_ALLOW, NULL);
    }
    else if (!strcmp(args[0], "reqirep")) {  /* replace request header from a regex, ignoring case */
	regex_t *preg;
	if (curproxy == &defproxy) {
	    Alert("parsing [%s:%d] : '%s' not allowed in 'defaults' section.\n", file, linenum, args[0]);
	    return -1;
	}
	
	if (*(args[1]) == 0 || *(args[2]) == 0) {
	    Alert("parsing [%s:%d] : '%s' expects <search> and <replace> as arguments.\n",
		  file, linenum, args[0]);
	    return -1;
	}
	
	preg = calloc(1, sizeof(regex_t));
	if (regcomp(preg, args[1], REG_EXTENDED | REG_ICASE) != 0) {
	    Alert("parsing [%s:%d] : bad regular expression '%s'.\n", file, linenum, args[1]);
	    return -1;
	}
	
	err = chain_regex(&curproxy->req_exp, preg, ACT_REPLACE, strdup(args[2]));
	if (err) {
	    Alert("parsing [%s:%d] : invalid character or unterminated sequence in replacement string near '%c'.\n",
		  file, linenum, *err);
	    return -1;
	}
    }
    else if (!strcmp(args[0], "reqidel")) {  /* delete request header from a regex ignoring case */
	regex_t *preg;
	if (curproxy == &defproxy) {
	    Alert("parsing [%s:%d] : '%s' not allowed in 'defaults' section.\n", file, linenum, args[0]);
	    return -1;
	}
	
	if (*(args[1]) == 0) {
	    Alert("parsing [%s:%d] : '%s' expects <regex> as an argument.\n", file, linenum, args[0]);
	    return -1;
	}
	
	preg = calloc(1, sizeof(regex_t));
	if (regcomp(preg, args[1], REG_EXTENDED | REG_ICASE) != 0) {
	    Alert("parsing [%s:%d] : bad regular expression '%s'.\n", file, linenum, args[1]);
	    return -1;
	}
	
	chain_regex(&curproxy->req_exp, preg, ACT_REMOVE, NULL);
    }
    else if (!strcmp(args[0], "reqideny")) {  /* deny a request if a header matches this regex ignoring case */
	regex_t *preg;
	if (curproxy == &defproxy) {
	    Alert("parsing [%s:%d] : '%s' not allowed in 'defaults' section.\n", file, linenum, args[0]);
	    return -1;
	}
	
	if (*(args[1]) == 0) {
	    Alert("parsing [%s:%d] : '%s' expects <regex> as an argument.\n", file, linenum, args[0]);
	    return -1;
	}
	
	preg = calloc(1, sizeof(regex_t));
	if (regcomp(preg, args[1], REG_EXTENDED | REG_ICASE) != 0) {
	    Alert("parsing [%s:%d] : bad regular expression '%s'.\n", file, linenum, args[1]);
	    return -1;
	}
	
	chain_regex(&curproxy->req_exp, preg, ACT_DENY, NULL);
    }
    else if (!strcmp(args[0], "reqipass")) {  /* pass this header without allowing or denying the request */
	regex_t *preg;
	if (curproxy == &defproxy) {
	    Alert("parsing [%s:%d] : '%s' not allowed in 'defaults' section.\n", file, linenum, args[0]);
	    return -1;
	}
	
	if (*(args[1]) == 0) {
	    Alert("parsing [%s:%d] : '%s' expects <regex> as an argument.\n", file, linenum, args[0]);
	    return -1;
	}
	
	preg = calloc(1, sizeof(regex_t));
	if (regcomp(preg, args[1], REG_EXTENDED | REG_ICASE) != 0) {
	    Alert("parsing [%s:%d] : bad regular expression '%s'.\n", file, linenum, args[1]);
	    return -1;
	}
	
	chain_regex(&curproxy->req_exp, preg, ACT_PASS, NULL);
    }
    else if (!strcmp(args[0], "reqiallow")) {  /* allow a request if a header matches this regex ignoring case */
	regex_t *preg;
	if (curproxy == &defproxy) {
	    Alert("parsing [%s:%d] : '%s' not allowed in 'defaults' section.\n", file, linenum, args[0]);
	    return -1;
	}
	
	if (*(args[1]) == 0) {
	    Alert("parsing [%s:%d] : '%s' expects <regex> as an argument.\n", file, linenum, args[0]);
	    return -1;
	}
	
	preg = calloc(1, sizeof(regex_t));
	if (regcomp(preg, args[1], REG_EXTENDED | REG_ICASE) != 0) {
	    Alert("parsing [%s:%d] : bad regular expression '%s'.\n", file, linenum, args[1]);
	    return -1;
	}
	
	chain_regex(&curproxy->req_exp, preg, ACT_ALLOW, NULL);
    }
    else if (!strcmp(args[0], "reqadd")) {  /* add request header */
	if (curproxy == &defproxy) {
	    Alert("parsing [%s:%d] : '%s' not allowed in 'defaults' section.\n", file, linenum, args[0]);
	    return -1;
	}

	if (curproxy->nb_reqadd >= MAX_NEWHDR) {
	    Alert("parsing [%s:%d] : too many '%s'. Continuing.\n", file, linenum, args[0]);
	    return 0;
	}
	
	if (*(args[1]) == 0) {
	    Alert("parsing [%s:%d] : '%s' expects <header> as an argument.\n", file, linenum, args[0]);
	    return -1;
	}
	
	curproxy->req_add[curproxy->nb_reqadd++] = strdup(args[1]);
    }
    else if (!strcmp(args[0], "srvexp") || !strcmp(args[0], "rsprep")) {  /* replace response header from a regex */
	regex_t *preg;
	
	if (*(args[1]) == 0 || *(args[2]) == 0) {
	    Alert("parsing [%s:%d] : '%s' expects <search> and <replace> as arguments.\n",
		  file, linenum, args[0]);
	    return -1;
	}
	
	preg = calloc(1, sizeof(regex_t));
	if (regcomp(preg, args[1], REG_EXTENDED) != 0) {
	    Alert("parsing [%s:%d] : bad regular expression '%s'.\n", file, linenum, args[1]);
	    return -1;
	}
	
	err = chain_regex(&curproxy->rsp_exp, preg, ACT_REPLACE, strdup(args[2]));
	if (err) {
	    Alert("parsing [%s:%d] : invalid character or unterminated sequence in replacement string near '%c'.\n",
		  file, linenum, *err);
	    return -1;
	}
    }
    else if (!strcmp(args[0], "rspdel")) {  /* delete response header from a regex */
	regex_t *preg;
	if (curproxy == &defproxy) {
	    Alert("parsing [%s:%d] : '%s' not allowed in 'defaults' section.\n", file, linenum, args[0]);
	    return -1;
	}
	
	if (*(args[1]) == 0) {
	    Alert("parsing [%s:%d] : '%s' expects <search> as an argument.\n", file, linenum, args[0]);
	    return -1;
	}

	preg = calloc(1, sizeof(regex_t));
	if (regcomp(preg, args[1], REG_EXTENDED) != 0) {
	    Alert("parsing [%s:%d] : bad regular expression '%s'.\n", file, linenum, args[1]);
	    return -1;
	}
	
	err = chain_regex(&curproxy->rsp_exp, preg, ACT_REMOVE, strdup(args[2]));
	if (err) {
	    Alert("parsing [%s:%d] : invalid character or unterminated sequence in replacement string near '%c'.\n",
		  file, linenum, *err);
	    return -1;
	}
    }
    else if (!strcmp(args[0], "rspdeny")) {  /* block response header from a regex */
	regex_t *preg;
	if (curproxy == &defproxy) {
	    Alert("parsing [%s:%d] : '%s' not allowed in 'defaults' section.\n", file, linenum, args[0]);
	    return -1;
	}
	
	if (*(args[1]) == 0) {
	    Alert("parsing [%s:%d] : '%s' expects <search> as an argument.\n", file, linenum, args[0]);
	    return -1;
	}

	preg = calloc(1, sizeof(regex_t));
	if (regcomp(preg, args[1], REG_EXTENDED) != 0) {
	    Alert("parsing [%s:%d] : bad regular expression '%s'.\n", file, linenum, args[1]);
	    return -1;
	}
	
	err = chain_regex(&curproxy->rsp_exp, preg, ACT_DENY, strdup(args[2]));
	if (err) {
	    Alert("parsing [%s:%d] : invalid character or unterminated sequence in replacement string near '%c'.\n",
		  file, linenum, *err);
	    return -1;
	}
    }
    else if (!strcmp(args[0], "rspirep")) {  /* replace response header from a regex ignoring case */
	regex_t *preg;
	if (curproxy == &defproxy) {
	    Alert("parsing [%s:%d] : '%s' not allowed in 'defaults' section.\n", file, linenum, args[0]);
	    return -1;
	}

	if (*(args[1]) == 0 || *(args[2]) == 0) {
	    Alert("parsing [%s:%d] : '%s' expects <search> and <replace> as arguments.\n",
		  file, linenum, args[0]);
	    return -1;
	}

	preg = calloc(1, sizeof(regex_t));
	if (regcomp(preg, args[1], REG_EXTENDED | REG_ICASE) != 0) {
	    Alert("parsing [%s:%d] : bad regular expression '%s'.\n", file, linenum, args[1]);
	    return -1;
	}
	    
	err = chain_regex(&curproxy->rsp_exp, preg, ACT_REPLACE, strdup(args[2]));
	if (err) {
	    Alert("parsing [%s:%d] : invalid character or unterminated sequence in replacement string near '%c'.\n",
		  file, linenum, *err);
	    return -1;
	}
    }
    else if (!strcmp(args[0], "rspidel")) {  /* delete response header from a regex ignoring case */
	regex_t *preg;
	if (curproxy == &defproxy) {
	    Alert("parsing [%s:%d] : '%s' not allowed in 'defaults' section.\n", file, linenum, args[0]);
	    return -1;
	}
	
	if (*(args[1]) == 0) {
	    Alert("parsing [%s:%d] : '%s' expects <search> as an argument.\n", file, linenum, args[0]);
	    return -1;
	}

	preg = calloc(1, sizeof(regex_t));
	if (regcomp(preg, args[1], REG_EXTENDED | REG_ICASE) != 0) {
	    Alert("parsing [%s:%d] : bad regular expression '%s'.\n", file, linenum, args[1]);
	    return -1;
	}
	
	err = chain_regex(&curproxy->rsp_exp, preg, ACT_REMOVE, strdup(args[2]));
	if (err) {
	    Alert("parsing [%s:%d] : invalid character or unterminated sequence in replacement string near '%c'.\n",
		  file, linenum, *err);
	    return -1;
	}
    }
    else if (!strcmp(args[0], "rspideny")) {  /* block response header from a regex ignoring case */
	regex_t *preg;
	if (curproxy == &defproxy) {
	    Alert("parsing [%s:%d] : '%s' not allowed in 'defaults' section.\n", file, linenum, args[0]);
	    return -1;
	}
	
	if (*(args[1]) == 0) {
	    Alert("parsing [%s:%d] : '%s' expects <search> as an argument.\n", file, linenum, args[0]);
	    return -1;
	}

	preg = calloc(1, sizeof(regex_t));
	if (regcomp(preg, args[1], REG_EXTENDED | REG_ICASE) != 0) {
	    Alert("parsing [%s:%d] : bad regular expression '%s'.\n", file, linenum, args[1]);
	    return -1;
	}
	
	err = chain_regex(&curproxy->rsp_exp, preg, ACT_DENY, strdup(args[2]));
	if (err) {
	    Alert("parsing [%s:%d] : invalid character or unterminated sequence in replacement string near '%c'.\n",
		  file, linenum, *err);
	    return -1;
	}
    }
    else if (!strcmp(args[0], "rspadd")) {  /* add response header */
	if (curproxy == &defproxy) {
	    Alert("parsing [%s:%d] : '%s' not allowed in 'defaults' section.\n", file, linenum, args[0]);
	    return -1;
	}

	if (curproxy->nb_rspadd >= MAX_NEWHDR) {
	    Alert("parsing [%s:%d] : too many '%s'. Continuing.\n", file, linenum, args[0]);
	    return 0;
	}
	
	if (*(args[1]) == 0) {
	    Alert("parsing [%s:%d] : '%s' expects <header> as an argument.\n", file, linenum, args[0]);
	    return -1;
	}
	
	curproxy->rsp_add[curproxy->nb_rspadd++] = strdup(args[1]);
    }
    else if (!strcmp(args[0], "errorloc") ||
	     !strcmp(args[0], "errorloc302") ||
	     !strcmp(args[0], "errorloc303")) { /* error location */
	int errnum, errlen;
	char *err;

	// if (curproxy == &defproxy) {
	//     Alert("parsing [%s:%d] : '%s' not allowed in 'defaults' section.\n", file, linenum, args[0]);
	//     return -1;
	// }

	if (*(args[2]) == 0) {
	    Alert("parsing [%s:%d] : <errorloc> expects <error> and <url> as arguments.\n", file, linenum);
	    return -1;
	}

	errnum = atol(args[1]);
	if (!strcmp(args[0], "errorloc303")) {
	    err = malloc(strlen(HTTP_303) + strlen(args[2]) + 5);
	    errlen = sprintf(err, "%s%s\r\n\r\n", HTTP_303, args[2]);
	} else {
	    err = malloc(strlen(HTTP_302) + strlen(args[2]) + 5);
	    errlen = sprintf(err, "%s%s\r\n\r\n", HTTP_302, args[2]);
	}

	if (errnum == 400) {
	    if (curproxy->errmsg.msg400) {
		//Warning("parsing [%s:%d] : error %d already defined.\n", file, linenum, errnum);
		free(curproxy->errmsg.msg400);
	    }
	    curproxy->errmsg.msg400 = err;
	    curproxy->errmsg.len400 = errlen;
	}
	else if (errnum == 403) {
	    if (curproxy->errmsg.msg403) {
		//Warning("parsing [%s:%d] : error %d already defined.\n", file, linenum, errnum);
		free(curproxy->errmsg.msg403);
	    }
	    curproxy->errmsg.msg403 = err;
	    curproxy->errmsg.len403 = errlen;
	}
	else if (errnum == 408) {
	    if (curproxy->errmsg.msg408) {
		//Warning("parsing [%s:%d] : error %d already defined.\n", file, linenum, errnum);
		free(curproxy->errmsg.msg408);
	    }
	    curproxy->errmsg.msg408 = err;
	    curproxy->errmsg.len408 = errlen;
	}
	else if (errnum == 500) {
	    if (curproxy->errmsg.msg500) {
		//Warning("parsing [%s:%d] : error %d already defined.\n", file, linenum, errnum);
		free(curproxy->errmsg.msg500);
	    }
	    curproxy->errmsg.msg500 = err;
	    curproxy->errmsg.len500 = errlen;
	}
	else if (errnum == 502) {
	    if (curproxy->errmsg.msg502) {
		//Warning("parsing [%s:%d] : error %d already defined.\n", file, linenum, errnum);
		free(curproxy->errmsg.msg502);
	    }
	    curproxy->errmsg.msg502 = err;
	    curproxy->errmsg.len502 = errlen;
	}
	else if (errnum == 503) {
	    if (curproxy->errmsg.msg503) {
		//Warning("parsing [%s:%d] : error %d already defined.\n", file, linenum, errnum);
		free(curproxy->errmsg.msg503);
	    }
	    curproxy->errmsg.msg503 = err;
	    curproxy->errmsg.len503 = errlen;
	}
	else if (errnum == 504) {
	    if (curproxy->errmsg.msg504) {
		//Warning("parsing [%s:%d] : error %d already defined.\n", file, linenum, errnum);
		free(curproxy->errmsg.msg504);
	    }
	    curproxy->errmsg.msg504 = err;
	    curproxy->errmsg.len504 = errlen;
	}
	else {
	    Warning("parsing [%s:%d] : error %d relocation will be ignored.\n", file, linenum, errnum);
	    free(err);
	}
    }
    else {
	Alert("parsing [%s:%d] : unknown keyword '%s' in '%s' section\n", file, linenum, args[0], "listen");
	return -1;
    }
    return 0;
}


/*
 * This function reads and parses the configuration file given in the argument.
 * returns 0 if OK, -1 if error.
 */
int readcfgfile(char *file) {
    char thisline[256];
    char *line;
    FILE *f;
    int linenum = 0;
    char *end;
    char *args[MAX_LINE_ARGS];
    int arg;
    int cfgerr = 0;
    int nbchk, mininter;
    int confsect = CFG_NONE;

    struct proxy *curproxy = NULL;
    struct server *newsrv = NULL;

    if ((f=fopen(file,"r")) == NULL)
	return -1;

    init_default_instance();

    while (fgets(line = thisline, sizeof(thisline), f) != NULL) {
	linenum++;

	end = line + strlen(line);

	/* skip leading spaces */
	while (isspace((int)*line))
	    line++;
	
	arg = 0;
	args[arg] = line;

	while (*line && arg < MAX_LINE_ARGS) {
	    /* first, we'll replace \\, \<space>, \#, \r, \n, \t, \xXX with their
	     * C equivalent value. Other combinations left unchanged (eg: \1).
	     */
	    if (*line == '\\') {
		int skip = 0;
		if (line[1] == ' ' || line[1] == '\\' || line[1] == '#') {
		    *line = line[1];
		    skip = 1;
		}
		else if (line[1] == 'r') {
		    *line = '\r';
		    skip = 1;
		} 
		else if (line[1] == 'n') {
		    *line = '\n';
		    skip = 1;
		}
		else if (line[1] == 't') {
		    *line = '\t';
		    skip = 1;
		}
		else if (line[1] == 'x') {
		    if ((line + 3 < end ) && ishex(line[2]) && ishex(line[3])) {
			unsigned char hex1, hex2;
			hex1 = toupper(line[2]) - '0';
			hex2 = toupper(line[3]) - '0';
			if (hex1 > 9) hex1 -= 'A' - '9' - 1;
			if (hex2 > 9) hex2 -= 'A' - '9' - 1;
			*line = (hex1<<4) + hex2;
			skip = 3;
		    }
		    else {
			Alert("parsing [%s:%d] : invalid or incomplete '\\x' sequence in '%s'.\n", file, linenum, args[0]);
			return -1;
		    }
		}
		if (skip) {
		    memmove(line + 1, line + 1 + skip, end - (line + skip + 1));
		    end -= skip;
		}
		line++;
	    }
	    else if (*line == '#' || *line == '\n' || *line == '\r') {
		/* end of string, end of loop */
		*line = 0;
		break;
	    }
	    else if (isspace((int)*line)) {
		/* a non-escaped space is an argument separator */
		*line++ = 0;
		while (isspace((int)*line))
		    line++;
		args[++arg] = line;
	    }
	    else {
		line++;
	    }
	}

	/* empty line */
	if (!**args)
	    continue;

	/* zero out remaining args */
	while (++arg < MAX_LINE_ARGS) {
	    args[arg] = line;
	}

	if (!strcmp(args[0], "listen") || !strcmp(args[0], "defaults"))  /* new proxy */
	    confsect = CFG_LISTEN;
	else if (!strcmp(args[0], "global"))  /* global config */
	    confsect = CFG_GLOBAL;
	/* else it's a section keyword */

	switch (confsect) {
	case CFG_LISTEN:
	    if (cfg_parse_listen(file, linenum, args) < 0)
		return -1;
	    break;
	case CFG_GLOBAL:
	    if (cfg_parse_global(file, linenum, args) < 0)
		return -1;
	    break;
	default:
	    Alert("parsing [%s:%d] : unknown keyword '%s' out of section.\n", file, linenum, args[0]);
	    return -1;
	}
	    
	    
    }
    fclose(f);

    /*
     * Now, check for the integrity of all that we have collected.
     */

    /* will be needed further to delay some tasks */
    tv_now(&now);

    if ((curproxy = proxy) == NULL) {
	Alert("parsing %s : no <listen> line. Nothing to do !\n",
	      file);
	return -1;
    }

    while (curproxy != NULL) {
	if (curproxy->state == PR_STSTOPPED) {
	    curproxy = curproxy->next;
	    continue;
	}

	if (curproxy->listen == NULL) {
	    Alert("parsing %s : listener %s has no listen address. Please either specify a valid address on the <listen> line, or use the <bind> keyword.\n", file, curproxy->id);
	    cfgerr++;
	}
	else if ((curproxy->mode != PR_MODE_HEALTH) &&
	    !(curproxy->options & (PR_O_TRANSP | PR_O_BALANCE)) &&
	    (*(int *)&curproxy->dispatch_addr.sin_addr == 0)) {
	    Alert("parsing %s : listener %s has no dispatch address and is not in transparent or balance mode.\n",
		    file, curproxy->id);
	    cfgerr++;
	}
	else if ((curproxy->mode != PR_MODE_HEALTH) && (curproxy->options & PR_O_BALANCE)) {
	    if (curproxy->options & PR_O_TRANSP) {
		Alert("parsing %s : listener %s cannot use both transparent and balance mode.\n",
		      file, curproxy->id);
		cfgerr++;
	    }
	    else if (curproxy->srv == NULL) {
		Alert("parsing %s : listener %s needs at least 1 server in balance mode.\n",
		      file, curproxy->id);
		cfgerr++;
	    }
	    else if (*(int *)&curproxy->dispatch_addr.sin_addr != 0) {
		Warning("parsing %s : dispatch address of listener %s will be ignored in balance mode.\n",
			file, curproxy->id);
	    }
	}
	else if (curproxy->mode == PR_MODE_TCP || curproxy->mode == PR_MODE_HEALTH) { /* TCP PROXY or HEALTH CHECK */
	    if (curproxy->cookie_name != NULL) {
		Warning("parsing %s : cookie will be ignored for listener %s.\n",
			file, curproxy->id);
	    }
	    if ((newsrv = curproxy->srv) != NULL) {
		Warning("parsing %s : servers will be ignored for listener %s.\n",
			file, curproxy->id);
	    }
	    if (curproxy->rsp_exp != NULL) {
		Warning("parsing %s : server regular expressions will be ignored for listener %s.\n",
			file, curproxy->id);
	    }
	    if (curproxy->req_exp != NULL) {
		Warning("parsing %s : client regular expressions will be ignored for listener %s.\n",
			file, curproxy->id);
	    }
	}
	else if (curproxy->mode == PR_MODE_HTTP) { /* HTTP PROXY */
	    if ((curproxy->cookie_name != NULL) && ((newsrv = curproxy->srv) == NULL)) {
		Alert("parsing %s : HTTP proxy %s has a cookie but no server list !\n",
		      file, curproxy->id);
		cfgerr++;
	    }
	}

	/* first, we will invert the servers list order */
	newsrv = NULL;
	while (curproxy->srv) {
	    struct server *next;

	    next = curproxy->srv->next;
	    curproxy->srv->next = newsrv;
	    newsrv = curproxy->srv;
	    if (!next)
		break;
	    curproxy->srv = next;
	}

	/* now, newsrv == curproxy->srv */
	if (newsrv) {
	    struct server *srv;
	    int pgcd;
	    int act, bck;

	    /* We will factor the weights to reduce the table,
	     * using Euclide's largest common divisor algorithm
	     */
	    pgcd = newsrv->uweight + 1;
	    for (srv = newsrv->next; srv && pgcd > 1; srv = srv->next) {
		int t, w;
		
		w = srv->uweight + 1;
		while (w) {
		    t = pgcd % w;
		    pgcd = w;
		    w = t;
			}
	    }

	    act = bck = 0;
	    for (srv = newsrv; srv; srv = srv->next) {
		srv->eweight = ((srv->uweight + 1) / pgcd) - 1;
		if (srv->state & SRV_BACKUP)
		    bck += srv->eweight + 1;
		else
		    act += srv->eweight + 1;
	    }

	    /* this is the largest map we will ever need for this servers list */
	    if (act < bck)
		act = bck;

	    curproxy->srv_map = (struct server **)calloc(act, sizeof(struct server *));
	    /* recounts servers and their weights */
	    recount_servers(curproxy);
	    recalc_server_map(curproxy);
	}

	if (curproxy->options & PR_O_LOGASAP)
	    curproxy->to_log &= ~LW_BYTES;

	if (curproxy->errmsg.msg400 == NULL) {
	    curproxy->errmsg.msg400 = (char *)HTTP_400;
	    curproxy->errmsg.len400 = strlen(HTTP_400);
	}
	if (curproxy->errmsg.msg403 == NULL) {
	    curproxy->errmsg.msg403 = (char *)HTTP_403;
	    curproxy->errmsg.len403 = strlen(HTTP_403);
	}
	if (curproxy->errmsg.msg408 == NULL) {
	    curproxy->errmsg.msg408 = (char *)HTTP_408;
	    curproxy->errmsg.len408 = strlen(HTTP_408);
	}
	if (curproxy->errmsg.msg500 == NULL) {
	    curproxy->errmsg.msg500 = (char *)HTTP_500;
	    curproxy->errmsg.len500 = strlen(HTTP_500);
	}
	if (curproxy->errmsg.msg502 == NULL) {
	    curproxy->errmsg.msg502 = (char *)HTTP_502;
	    curproxy->errmsg.len502 = strlen(HTTP_502);
	}
	if (curproxy->errmsg.msg503 == NULL) {
	    curproxy->errmsg.msg503 = (char *)HTTP_503;
	    curproxy->errmsg.len503 = strlen(HTTP_503);
	}
	if (curproxy->errmsg.msg504 == NULL) {
	    curproxy->errmsg.msg504 = (char *)HTTP_504;
	    curproxy->errmsg.len504 = strlen(HTTP_504);
	}

	/* now we'll start this proxy's health checks if any */
	/* 1- count the checkers to run simultaneously */
	nbchk = 0;
	mininter = 0;
	newsrv = curproxy->srv;
	while (newsrv != NULL) {
	    if (newsrv->state & SRV_CHECKED) {
		if (!mininter || mininter > newsrv->inter)
		    mininter = newsrv->inter;
		nbchk++;
	    }
	    newsrv = newsrv->next;
	}

	/* 2- start them as far as possible from each others while respecting
	 * their own intervals. For this, we will start them after their own
	 * interval added to the min interval divided by the number of servers,
	 * weighted by the server's position in the list.
	 */
	if (nbchk > 0) {
	    struct task *t;
	    int srvpos;

	    newsrv = curproxy->srv;
	    srvpos = 0;
	    while (newsrv != NULL) {
		/* should this server be checked ? */
		if (newsrv->state & SRV_CHECKED) {
		    if ((t = pool_alloc(task)) == NULL) {
			Alert("parsing [%s:%d] : out of memory.\n", file, linenum);
			return -1;
		    }
		
		    t->next = t->prev = t->rqnext = NULL; /* task not in run queue yet */
		    t->wq = LIST_HEAD(wait_queue[0]); /* but already has a wait queue assigned */
		    t->state = TASK_IDLE;
		    t->process = process_chk;
		    t->context = newsrv;
		
		    /* check this every ms */
		    tv_delayfrom(&t->expire, &now,
				 newsrv->inter + mininter * srvpos / nbchk);
		    task_queue(t);
		    //task_wakeup(&rq, t);
		    srvpos++;
		}
		newsrv = newsrv->next;
	    }
	}

	curproxy = curproxy->next;
    }
    if (cfgerr > 0) {
	Alert("Errors found in configuration file, aborting.\n");
	return -1;
    }
    else
	return 0;
}


/*
 * This function initializes all the necessary variables. It only returns
 * if everything is OK. If something fails, it exits.
 */
void init(int argc, char **argv) {
    int i;
    int arg_mode = 0;	/* MODE_DEBUG, ... */
    char *old_argv = *argv;
    char *tmp;
    char *cfg_pidfile = NULL;

    if (1<<INTBITS != sizeof(int)*8) {
	fprintf(stderr,
		"Error: wrong architecture. Recompile so that sizeof(int)=%d\n",
		(int)(sizeof(int)*8));
	exit(1);
    }

#ifdef HAPROXY_MEMMAX
    global.rlimit_memmax = HAPROXY_MEMMAX;
#endif

    /* initialize the libc's localtime structures once for all so that we
     * won't be missing memory if we want to send alerts under OOM conditions.
     */
    tv_now(&now);
    localtime(&now.tv_sec);

    /* initialize the log header encoding map : '{|}"#' should be encoded with
     * '#' as prefix, as well as non-printable characters ( <32 or >= 127 ).
     * URL encoding only requires '"', '#' to be encoded as well as non-
     * printable characters above.
     */
    memset(hdr_encode_map, 0, sizeof(hdr_encode_map));
    memset(url_encode_map, 0, sizeof(url_encode_map));
    for (i = 0; i < 32; i++) {
	FD_SET(i, hdr_encode_map);
	FD_SET(i, url_encode_map);
    }
    for (i = 127; i < 256; i++) {
	FD_SET(i, hdr_encode_map);
	FD_SET(i, url_encode_map);
    }

    tmp = "\"#{|}";
    while (*tmp) {
	FD_SET(*tmp, hdr_encode_map);
	tmp++;
    }

    tmp = "\"#";
    while (*tmp) {
	FD_SET(*tmp, url_encode_map);
	tmp++;
    }

    cfg_polling_mechanism = POLL_USE_SELECT;  /* select() is always available */
#if defined(ENABLE_POLL)
    cfg_polling_mechanism |= POLL_USE_POLL;
#endif
#if defined(ENABLE_EPOLL)
    cfg_polling_mechanism |= POLL_USE_EPOLL;
#endif

    pid = getpid();
    progname = *argv;
    while ((tmp = strchr(progname, '/')) != NULL)
	progname = tmp + 1;

    argc--; argv++;
    while (argc > 0) {
	char *flag;

	if (**argv == '-') {
	    flag = *argv+1;

	    /* 1 arg */
	    if (*flag == 'v') {
		display_version();
		exit(0);
	    }
#if defined(ENABLE_EPOLL)
	    else if (*flag == 'd' && flag[1] == 'e')
		cfg_polling_mechanism &= ~POLL_USE_EPOLL;
#endif
#if defined(ENABLE_POLL)
	    else if (*flag == 'd' && flag[1] == 'p')
		cfg_polling_mechanism &= ~POLL_USE_POLL;
#endif
	    else if (*flag == 'V')
		arg_mode |= MODE_VERBOSE;
	    else if (*flag == 'd' && flag[1] == 'b')
		arg_mode |= MODE_FOREGROUND;
	    else if (*flag == 'd')
		arg_mode |= MODE_DEBUG;
	    else if (*flag == 'c')
		arg_mode |= MODE_CHECK;
	    else if (*flag == 'D')
		arg_mode |= MODE_DAEMON | MODE_QUIET;
	    else if (*flag == 'q')
		arg_mode |= MODE_QUIET;
	    else if (*flag == 's' && (flag[1] == 'f' || flag[1] == 't')) {
		/* list of pids to finish ('f') or terminate ('t') */

		if (flag[1] == 'f')
		    oldpids_sig = SIGUSR1; /* finish then exit */
		else
		    oldpids_sig = SIGTERM; /* terminate immediately */
		argv++; argc--;

		if (argc > 0) {
		    oldpids = calloc(argc, sizeof(int));
		    while (argc > 0) {
			oldpids[nb_oldpids] = atol(*argv);
			if (oldpids[nb_oldpids] <= 0)
			    usage(old_argv);
			argc--; argv++;
			nb_oldpids++;
		    }
		}
	    }
#if STATTIME > 0
	    else if (*flag == 's')
		arg_mode |= MODE_STATS;
	    else if (*flag == 'l')
		arg_mode |= MODE_LOG;
#endif
	    else { /* >=2 args */
		argv++; argc--;
		if (argc == 0)
		    usage(old_argv);

		switch (*flag) {
		case 'n' : cfg_maxconn = atol(*argv); break;
		case 'm' : global.rlimit_memmax = atol(*argv); break;
		case 'N' : cfg_maxpconn = atol(*argv); break;
		case 'f' : cfg_cfgfile = *argv; break;
		case 'p' : cfg_pidfile = *argv; break;
		default: usage(old_argv);
		}
	    }
	}
	else
	    usage(old_argv);
	argv++; argc--;
    }

    global.mode = MODE_STARTING | /* during startup, we want most of the alerts */
		  (arg_mode & (MODE_DAEMON | MODE_FOREGROUND | MODE_VERBOSE
			       | MODE_QUIET | MODE_CHECK | MODE_DEBUG));

    if (!cfg_cfgfile)
	usage(old_argv);

    gethostname(hostname, MAX_HOSTNAME_LEN);

    have_appsession = 0;
    global.maxsock = 10; /* reserve 10 fds ; will be incremented by socket eaters */
    if (readcfgfile(cfg_cfgfile) < 0) {
	Alert("Error reading configuration file : %s\n", cfg_cfgfile);
	exit(1);
    }
    if (have_appsession)
	appsession_init();

    if (global.mode & MODE_CHECK) {
	qfprintf(stdout, "Configuration file is valid : %s\n", cfg_cfgfile);
	exit(0);
    }

    if (cfg_maxconn > 0)
	global.maxconn = cfg_maxconn;

    if (cfg_pidfile) {
	if (global.pidfile)
	    free(global.pidfile);
	global.pidfile = strdup(cfg_pidfile);
    }

    if (global.maxconn == 0)
	global.maxconn = DEFAULT_MAXCONN;

    global.maxsock += global.maxconn * 2; /* each connection needs two sockets */

    if (arg_mode & (MODE_DEBUG | MODE_FOREGROUND)) {
	/* command line debug mode inhibits configuration mode */
	global.mode &= ~(MODE_DAEMON | MODE_QUIET);
    }
    global.mode |= (arg_mode & (MODE_DAEMON | MODE_FOREGROUND | MODE_QUIET |
				MODE_VERBOSE | MODE_DEBUG | MODE_STATS | MODE_LOG));

    if ((global.mode & MODE_DEBUG) && (global.mode & (MODE_DAEMON | MODE_QUIET))) {
	Warning("<debug> mode incompatible with <quiet> and <daemon>. Keeping <debug> only.\n");
	global.mode &= ~(MODE_DAEMON | MODE_QUIET);
    }

    if ((global.nbproc > 1) && !(global.mode & MODE_DAEMON)) {
	if (!(global.mode & (MODE_FOREGROUND | MODE_DEBUG)))
	    Warning("<nbproc> is only meaningful in daemon mode. Setting limit to 1 process.\n");
	global.nbproc = 1;
    }

    if (global.nbproc < 1)
	global.nbproc = 1;

    StaticReadEvent = (fd_set *)calloc(1,
		sizeof(fd_set) *
		(global.maxsock + FD_SETSIZE - 1) / FD_SETSIZE);
    StaticWriteEvent = (fd_set *)calloc(1,
		sizeof(fd_set) *
		(global.maxsock + FD_SETSIZE - 1) / FD_SETSIZE);

    fdtab = (struct fdtab *)calloc(1,
		sizeof(struct fdtab) * (global.maxsock));
    for (i = 0; i < global.maxsock; i++) {
	fdtab[i].state = FD_STCLOSE;
    }
}

/*
 * this function starts all the proxies. Its return value is composed from
 * ERR_NONE, ERR_RETRYABLE and ERR_FATAL. Retryable errors will only be printed
 * if <verbose> is not zero.
 */
int start_proxies(int verbose) {
    struct proxy *curproxy;
    struct listener *listener;
    int err = ERR_NONE;
    int fd, pxerr;

    for (curproxy = proxy; curproxy != NULL; curproxy = curproxy->next) {
        if (curproxy->state != PR_STNEW)
	    continue; /* already initialized */

	pxerr = 0;
	for (listener = curproxy->listen; listener != NULL; listener = listener->next) {
	    if (listener->fd != -1)
		continue; /* already initialized */

	    if ((fd = socket(listener->addr.ss_family, SOCK_STREAM, IPPROTO_TCP)) == -1) {
		if (verbose)
		    Alert("cannot create listening socket for proxy %s. Aborting.\n",
			  curproxy->id);
		err |= ERR_RETRYABLE;
		pxerr |= 1;
	        continue;
	    }
	
	    if (fd >= global.maxsock) {
		Alert("socket(): not enough free sockets for proxy %s. Raise -n argument. Aborting.\n",
		      curproxy->id);
		close(fd);
		err |= ERR_FATAL;
		pxerr |= 1;
		break;
	    }

	    if ((fcntl(fd, F_SETFL, O_NONBLOCK) == -1) ||
		(setsockopt(fd, IPPROTO_TCP, TCP_NODELAY,
			    (char *) &one, sizeof(one)) == -1)) {
		Alert("cannot make socket non-blocking for proxy %s. Aborting.\n",
		      curproxy->id);
		close(fd);
		err |= ERR_FATAL;
		pxerr |= 1;
		break;
	    }

	    if (setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, (char *) &one, sizeof(one)) == -1) {
		Alert("cannot do so_reuseaddr for proxy %s. Continuing.\n",
		      curproxy->id);
	    }
	
	    if (bind(fd,
		     (struct sockaddr *)&listener->addr,
		     listener->addr.ss_family == AF_INET6 ?
		     sizeof(struct sockaddr_in6) :
		     sizeof(struct sockaddr_in)) == -1) {
		if (verbose)
		    Alert("cannot bind socket for proxy %s. Aborting.\n",
			  curproxy->id);
		close(fd);
		err |= ERR_RETRYABLE;
		pxerr |= 1;
		continue;
	    }
	
	    if (listen(fd, curproxy->maxconn) == -1) {
		if (verbose)
		    Alert("cannot listen to socket for proxy %s. Aborting.\n",
			  curproxy->id);
		close(fd);
		err |= ERR_RETRYABLE;
		pxerr |= 1;
		continue;
	    }
	
	    /* the socket is ready */
	    listener->fd = fd;

	    /* the function for the accept() event */
	    fdtab[fd].read  = &event_accept;
	    fdtab[fd].write = NULL; /* never called */
	    fdtab[fd].owner = (struct task *)curproxy; /* reference the proxy instead of a task */
	    fdtab[fd].state = FD_STLISTEN;
	    FD_SET(fd, StaticReadEvent);
	    fd_insert(fd);
	    listeners++;
	}

	if (!pxerr) {
	    curproxy->state = PR_STRUN;
	    send_log(curproxy, LOG_NOTICE, "Proxy %s started.\n", curproxy->id);
	}
    }

    return err;
}

int match_str(const void *key1, const void *key2) {

    appsess *temp1,*temp2;
    temp1 = (appsess *)key1;
    temp2 = (appsess *)key2;

    //fprintf(stdout,">>>>>>>>>>>>>>temp1->sessid :%s:\n",temp1->sessid);
    //fprintf(stdout,">>>>>>>>>>>>>>temp2->sessid :%s:\n",temp2->sessid);
  
    return (strcmp(temp1->sessid,temp2->sessid) == 0);
}/* end match_str */

void destroy(void *data) {
    appsess *temp1;

    //printf("destroy called\n");
    temp1 = (appsess *)data;

    if (temp1->sessid)
	pool_free_to(apools.sessid, temp1->sessid);

    if (temp1->serverid)
	pool_free_to(apools.serverid, temp1->serverid);

    pool_free(appsess, temp1);
} /* end destroy */

void appsession_cleanup( void )
{
    struct proxy *p = proxy;
  
    while(p) {
	chtbl_destroy(&(p->htbl_proxy));
	p = p->next;
    }
}/* end appsession_cleanup() */

void pool_destroy(void **pool)
{
    void *temp, *next;
    next = pool;
    while (next) {
	temp = next;
	next = *(void **)temp;
	free(temp);
    }
}/* end pool_destroy() */

void deinit(void) {
    struct proxy *p = proxy;
    struct cap_hdr *h,*h_next;
    struct server *s,*s_next;
    struct listener *l,*l_next;
  
    while (p) {
	if (p->id)
	    free(p->id);

	if (p->check_req)
	    free(p->check_req);

	if (p->cookie_name)
	    free(p->cookie_name);

	if (p->capture_name)
	    free(p->capture_name);

	/* only strup if the user have set in config.
	   When should we free it?!
	   if (p->errmsg.msg400) free(p->errmsg.msg400);
	   if (p->errmsg.msg403) free(p->errmsg.msg403);
	   if (p->errmsg.msg408) free(p->errmsg.msg408);
	   if (p->errmsg.msg500) free(p->errmsg.msg500);
	   if (p->errmsg.msg502) free(p->errmsg.msg502);
	   if (p->errmsg.msg503) free(p->errmsg.msg503);
	   if (p->errmsg.msg504) free(p->errmsg.msg504);
	*/
	if (p->appsession_name)
	    free(p->appsession_name);

	h = p->req_cap;
	while (h) {
	    h_next = h->next;
	    if (h->name)
		free(h->name);
	    pool_destroy(h->pool);
	    free(h);
	    h = h_next;
	}/* end while(h) */

	h = p->rsp_cap;
	while (h) {
	    h_next = h->next;
	    if (h->name)
		free(h->name);
	    
	    pool_destroy(h->pool);
	    free(h);
	    h = h_next;
	}/* end while(h) */
	
	s = p->srv;
	while (s) {
	    s_next = s->next;
	    if (s->id)
		free(s->id);
	    
	    if (s->cookie)
		free(s->cookie);
	    
	    free(s);
	    s = s_next;
	}/* end while(s) */
	
	l = p->listen;
	while (l) {
	    l_next = l->next;
	    free(l);
	    l = l_next;
	}/* end while(l) */
	
	pool_destroy((void **) p->req_cap_pool);
	pool_destroy((void **) p->rsp_cap_pool);
	p = p->next;
    }/* end while(p) */
    
    if (global.chroot)    free(global.chroot);
    if (global.pidfile)   free(global.pidfile);
    
    if (StaticReadEvent)  free(StaticReadEvent);
    if (StaticWriteEvent) free(StaticWriteEvent);
    if (fdtab)            free(fdtab);
    
    pool_destroy(pool_session);
    pool_destroy(pool_buffer);
    pool_destroy(pool_fdtab);
    pool_destroy(pool_requri);
    pool_destroy(pool_task);
    pool_destroy(pool_capture);
    pool_destroy(pool_appsess);
    
    if (have_appsession) {
        pool_destroy(apools.serverid);
        pool_destroy(apools.sessid);
    }
} /* end deinit() */

/* sends the signal <sig> to all pids found in <oldpids> */
static void tell_old_pids(int sig) {
    int p;
    for (p = 0; p < nb_oldpids; p++)
	kill(oldpids[p], sig);
}

int main(int argc, char **argv) {
    int err, retry;
    struct rlimit limit;
    FILE *pidfile = NULL;
    init(argc, argv);

    signal(SIGQUIT, dump);
    signal(SIGUSR1, sig_soft_stop);
    signal(SIGHUP, sig_dump_state);
#ifdef DEBUG_MEMORY
    signal(SIGINT, sig_int);
    signal(SIGTERM, sig_term);
#endif

    /* on very high loads, a sigpipe sometimes happen just between the
     * getsockopt() which tells "it's OK to write", and the following write :-(
     */
#ifndef MSG_NOSIGNAL
    signal(SIGPIPE, SIG_IGN);
#endif

    /* We will loop at most 100 times with 10 ms delay each time.
     * That's at most 1 second. We only send a signal to old pids
     * if we cannot grab at least one port.
     */
    retry = MAX_START_RETRIES;
    err = ERR_NONE;
    while (retry >= 0) {
	struct timeval w;
	err = start_proxies(retry == 0 || nb_oldpids == 0);
	if (err != ERR_RETRYABLE)
	    break;
	if (nb_oldpids == 0)
	    break;

	tell_old_pids(SIGTTOU);
	/* give some time to old processes to stop listening */
	w.tv_sec = 0;
	w.tv_usec = 10*1000;
	select(0, NULL, NULL, NULL, &w);
	retry--;
    }

    /* Note: start_proxies() sends an alert when it fails. */
    if (err != ERR_NONE) {
	if (retry != MAX_START_RETRIES && nb_oldpids)
	    tell_old_pids(SIGTTIN);
	exit(1);
    }

    if (listeners == 0) {
	Alert("[%s.main()] No enabled listener found (check the <listen> keywords) ! Exiting.\n", argv[0]);
	/* Note: we don't have to send anything to the old pids because we
	 * never stopped them. */
	exit(1);
    }

    /* prepare pause/play signals */
    signal(SIGTTOU, sig_pause);
    signal(SIGTTIN, sig_listen);

    if (global.mode & MODE_DAEMON) {
	global.mode &= ~MODE_VERBOSE;
	global.mode |= MODE_QUIET;
    }

    /* MODE_QUIET can inhibit alerts and warnings below this line */

    global.mode &= ~MODE_STARTING;
    if ((global.mode & MODE_QUIET) && !(global.mode & MODE_VERBOSE)) {
	/* detach from the tty */
	fclose(stdin); fclose(stdout); fclose(stderr);
	close(0); close(1); close(2);
    }

    /* open log & pid files before the chroot */
    if (global.mode & MODE_DAEMON && global.pidfile != NULL) {
	int pidfd;
	unlink(global.pidfile);
	pidfd = open(global.pidfile, O_CREAT | O_WRONLY | O_TRUNC, 0644);
	if (pidfd < 0) {
	    Alert("[%s.main()] Cannot create pidfile %s\n", argv[0], global.pidfile);
	    if (nb_oldpids)
		tell_old_pids(SIGTTIN);
	    exit(1);
	}
	pidfile = fdopen(pidfd, "w");
    }

    /* chroot if needed */
    if (global.chroot != NULL) {
	if (chroot(global.chroot) == -1) {
	    Alert("[%s.main()] Cannot chroot(%s).\n", argv[0], global.chroot);
	    if (nb_oldpids)
		tell_old_pids(SIGTTIN);
	}
	chdir("/");
    }

    /* ulimits */
    if (!global.rlimit_nofile)
	global.rlimit_nofile = global.maxsock;

    if (global.rlimit_nofile) {
	limit.rlim_cur = limit.rlim_max = global.rlimit_nofile;
	if (setrlimit(RLIMIT_NOFILE, &limit) == -1) {
	    Warning("[%s.main()] Cannot raise FD limit to %d.\n", argv[0], global.rlimit_nofile);
	}
    }

    if (global.rlimit_memmax) {
	limit.rlim_cur = limit.rlim_max =
		global.rlimit_memmax * 1048576 / global.nbproc;
#ifdef RLIMIT_AS
	if (setrlimit(RLIMIT_AS, &limit) == -1) {
	    Warning("[%s.main()] Cannot fix MEM limit to %d megs.\n",
		    argv[0], global.rlimit_memmax);
	}
#else
	if (setrlimit(RLIMIT_DATA, &limit) == -1) {
	    Warning("[%s.main()] Cannot fix MEM limit to %d megs.\n",
		    argv[0], global.rlimit_memmax);
	}
#endif
    }

    if (nb_oldpids)
	tell_old_pids(oldpids_sig);

    /* Note that any error at this stage will be fatal because we will not
     * be able to restart the old pids.
     */

    /* setgid / setuid */
    if (global.gid && setgid(global.gid) == -1) {
	Alert("[%s.main()] Cannot set gid %d.\n", argv[0], global.gid);
	exit(1);
    }

    if (global.uid && setuid(global.uid) == -1) {
	Alert("[%s.main()] Cannot set uid %d.\n", argv[0], global.uid);
	exit(1);
    }

    /* check ulimits */
    limit.rlim_cur = limit.rlim_max = 0;
    getrlimit(RLIMIT_NOFILE, &limit);
    if (limit.rlim_cur < global.maxsock) {
	Warning("[%s.main()] FD limit (%d) too low for maxconn=%d/maxsock=%d. Please raise 'ulimit-n' to %d or more to avoid any trouble.\n",
		argv[0], limit.rlim_cur, global.maxconn, global.maxsock, global.maxsock);
    }

    if (global.mode & MODE_DAEMON) {
	int ret = 0;
	int proc;

	/* the father launches the required number of processes */
	for (proc = 0; proc < global.nbproc; proc++) {
	    ret = fork();
	    if (ret < 0) {
		Alert("[%s.main()] Cannot fork.\n", argv[0]);
		if (nb_oldpids)
		exit(1); /* there has been an error */
	    }
	    else if (ret == 0) /* child breaks here */
		break;
	    if (pidfile != NULL) {
		fprintf(pidfile, "%d\n", ret);
		fflush(pidfile);
	    }
	}
	/* close the pidfile both in children and father */
	if (pidfile != NULL)
	    fclose(pidfile);
	free(global.pidfile);

	if (proc == global.nbproc)
	    exit(0); /* parent must leave */

	/* if we're NOT in QUIET mode, we should now close the 3 first FDs to ensure
	 * that we can detach from the TTY. We MUST NOT do it in other cases since
	 * it would have already be done, and 0-2 would have been affected to listening
	 * sockets
	 */
    	if (!(global.mode & MODE_QUIET)) {
	    /* detach from the tty */
	    fclose(stdin); fclose(stdout); fclose(stderr);
	    close(0); close(1); close(2); /* close all fd's */
    	    global.mode |= MODE_QUIET; /* ensure that we won't say anything from now */
	}
	pid = getpid(); /* update child's pid */
	setsid();
    }

#if defined(ENABLE_EPOLL)
    if (cfg_polling_mechanism & POLL_USE_EPOLL) {
	if (epoll_loop(POLL_LOOP_ACTION_INIT)) {
	    epoll_loop(POLL_LOOP_ACTION_RUN);
	    epoll_loop(POLL_LOOP_ACTION_CLEAN);
	    cfg_polling_mechanism &= POLL_USE_EPOLL;
	}
	else {
	    Warning("epoll() is not available. Using poll()/select() instead.\n");
	    cfg_polling_mechanism &= ~POLL_USE_EPOLL;
	}
    }
#endif

#if defined(ENABLE_POLL)
    if (cfg_polling_mechanism & POLL_USE_POLL) {
	if (poll_loop(POLL_LOOP_ACTION_INIT)) {
	    poll_loop(POLL_LOOP_ACTION_RUN);
	    poll_loop(POLL_LOOP_ACTION_CLEAN);
	    cfg_polling_mechanism &= POLL_USE_POLL;
	}
	else {
	    Warning("poll() is not available. Using select() instead.\n");
	    cfg_polling_mechanism &= ~POLL_USE_POLL;
	}
    }
#endif
    if (cfg_polling_mechanism & POLL_USE_SELECT) {
	if (select_loop(POLL_LOOP_ACTION_INIT)) {
	    select_loop(POLL_LOOP_ACTION_RUN);
	    select_loop(POLL_LOOP_ACTION_CLEAN);
	    cfg_polling_mechanism &= POLL_USE_SELECT;
	}
    }


    /* Free all Hash Keys and all Hash elements */
    appsession_cleanup();
    /* Do some cleanup */ 
    deinit();
    
    exit(0);
}

#if defined(DEBUG_HASH)
static void print_table(const CHTbl *htbl) {

    ListElmt           *element;
    int                i;
    appsess *asession;

    /*****************************************************************************
     *                                                                            *
     *  Display the chained hash table.                                           *
     *                                                                            *
     *****************************************************************************/
    
    fprintf(stdout, "Table size is %d\n", chtbl_size(htbl));
    
    for (i = 0; i < TBLSIZ; i++) {
	fprintf(stdout, "Bucket[%03d]\n", i);
	
	for (element = list_head(&htbl->table[i]); element != NULL; element = list_next(element)) {
	    //fprintf(stdout, "%c", *(char *)list_data(element));
	    asession = (appsess *)list_data(element);
	    fprintf(stdout, "ELEM :%s:", asession->sessid);
	    fprintf(stdout, " Server :%s: \n", asession->serverid);
	    //fprintf(stdout, " Server request_count :%li:\n",asession->request_count);
	}
	
	fprintf(stdout, "\n");
    }
    return;
} /* end print_table */
#endif

static int appsession_init(void)
{
    static int          initialized = 0;
    int                 idlen;
    struct server       *s;
    struct proxy        *p = proxy;
    
    if (!initialized) {
	if (!appsession_task_init()) {
	    apools.sessid = NULL;
	    apools.serverid = NULL;
	    apools.ser_waste = 0;
	    apools.ser_use = 0;
	    apools.ser_msize = sizeof(void *);
	    apools.ses_waste = 0;
	    apools.ses_use = 0;
	    apools.ses_msize = sizeof(void *);
	    while (p) {
		s = p->srv;
		if (apools.ses_msize < p->appsession_len)
		    apools.ses_msize = p->appsession_len;
		while (s) {
		    idlen = strlen(s->id);
		    if (apools.ser_msize < idlen)
			apools.ser_msize = idlen;
		    s = s->next;
		}
		p = p->next;
	    }
	    apools.ser_msize ++; /* we use strings, so reserve space for '\0' */
	    apools.ses_msize ++;
	}
	else {
	    fprintf(stderr, "appsession_task_init failed\n");
	    return -1;
	}
	initialized ++;
    }
    return 0;
}

static int appsession_task_init(void)
{
    static int initialized = 0;
    struct task *t;
    if (!initialized) {
	if ((t = pool_alloc(task)) == NULL)
	    return -1;
	t->next = t->prev = t->rqnext = NULL;
	t->wq = LIST_HEAD(wait_queue[0]);
	t->state = TASK_IDLE;
	t->context = NULL;
	tv_delayfrom(&t->expire, &now, TBLCHKINT);
	task_queue(t);
	t->process = appsession_refresh;
	initialized ++;
    }
    return 0;
}

static int appsession_refresh(struct task *t) {
    struct proxy       *p = proxy;
    CHTbl              *htbl;
    ListElmt           *element, *last;
    int                i;
    appsess            *asession;
    void               *data;

    while (p) {
        if (p->appsession_name != NULL) {
            htbl = &p->htbl_proxy;
            /* if we ever give up the use of TBLSIZ, we need to change this */
            for (i = 0; i < TBLSIZ; i++) {
	        last = NULL;
                for (element = list_head(&htbl->table[i]); element != NULL; element = list_next(element)) {
                    asession = (appsess *)list_data(element);
                    if (tv_cmp2_ms(&asession->expire, &now) <= 0) {
                        if ((global.mode & MODE_DEBUG) && (!(global.mode & MODE_QUIET) || (global.mode & MODE_VERBOSE))) {
                            int len;
			    /*
			      on Linux NULL pointers are catched by sprintf, on solaris -> segfault 
			    */
                            len = sprintf(trash, "appsession_refresh: cleaning up expired Session '%s' on Server %s\n", 
			                  asession->sessid,  asession->serverid?asession->serverid:"(null)");
                            write(1, trash, len);
                        }
			/* delete the expired element from within the hash table */
                        if ((list_rem_next(&htbl->table[i], last, (void **)&data) == 0) 
			    && (htbl->table[i].destroy != NULL)) {
			    htbl->table[i].destroy(data);
			}
			if (last == NULL) {/* patient lost his head, get a new one */
			    element = list_head(&htbl->table[i]);
			    if (element == NULL) break; /* no heads left, go to next patient */
			}
			else
			    element = last;
                    }/* end if (tv_cmp2_ms(&asession->expire, &now) <= 0) */
                    else
			last = element;
                }/* end  for (element = list_head(&htbl->table[i]); element != NULL; element = list_next(element)) */
            }
	}
        p = p->next;
    }
    tv_delayfrom(&t->expire, &now, TBLCHKINT); /* check expiration every 5 seconds */
    return TBLCHKINT;
} /* end appsession_refresh */


/*
 * Local variables:
 *  c-indent-level: 4
 *  c-basic-offset: 4
 * End:
 */