/*
 * include/types/proxy.h
 * This file defines everything related to proxies.
 *
 * Copyright (C) 2000-2011 Willy Tarreau - w@1wt.eu
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation, version 2.1
 * exclusively.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
 */

#ifndef _TYPES_PROXY_H
#define _TYPES_PROXY_H

#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>

#include <common/appsession.h>
#include <common/chunk.h>
#include <common/config.h>
#include <common/mini-clist.h>
#include <common/regex.h>
#include <common/sessionhash.h>
#include <common/tools.h>
#include <eb32tree.h>
#include <ebistree.h>

#include <types/acl.h>
#include <types/backend.h>
#include <types/counters.h>
#include <types/freq_ctr.h>
#include <types/listener.h>
#include <types/log.h>
#include <types/obj_type.h>
#include <types/proto_http.h>
#include <types/sample.h>
#include <types/session.h>
#include <types/server.h>
#include <types/stick_table.h>

/* values for proxy->state */
enum pr_state {
	PR_STNEW = 0,           /* proxy has not been initialized yet */
	PR_STREADY,             /* proxy has been initialized and is ready */
	PR_STFULL,              /* frontend is full (maxconn reached) */
	PR_STPAUSED,            /* frontend is paused (during hot restart) */
	PR_STSTOPPED,           /* proxy is stopped (end of a restart) */
	PR_STERROR,             /* proxy experienced an unrecoverable error */
} __attribute__((packed));

/* values for proxy->mode */
enum pr_mode {
	PR_MODE_TCP = 0,
	PR_MODE_HTTP,
	PR_MODE_HEALTH,
} __attribute__((packed));

/* flag values for proxy->cap. This is a bitmask of capabilities supported by the proxy */
#define PR_CAP_NONE    0x0000
#define PR_CAP_FE      0x0001
#define PR_CAP_BE      0x0002
#define PR_CAP_RS      0x0004
#define PR_CAP_LISTEN  (PR_CAP_FE|PR_CAP_BE|PR_CAP_RS)

/* 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 */
/* unused: 0x04, 0x08, 0x10 */
#define PR_O_PREF_LAST  0x00000020      /* prefer last server */
#define PR_O_DISPATCH   0x00000040      /* use dispatch mode */
/* unused: 0x00000080 */
#define PR_O_FWDFOR     0x00000100      /* conditionally insert x-forwarded-for with client address */
/* unused: 0x00000200 */
#define PR_O_NULLNOLOG  0x00000400      /* a connect without request will not be logged */
/* unused: 0x0800, 0x1000 */
#define PR_O_FF_ALWAYS  0x00002000      /* always set x-forwarded-for */
#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 */
/* unused: 0x00010000 */
#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 */
/* unused: 0x00020000 */
#define PR_O_TCP_NOLING 0x00400000      /* disable lingering on client and server connections */
#define PR_O_ABRT_CLOSE 0x00800000      /* immediately abort request when client closes */

/* unused: 0x01000000, 0x02000000, 0x04000000, 0x08000000 */
#define PR_O_HTTP_KAL   0x00000000      /* HTTP keep-alive mode (http-keep-alive) */
#define PR_O_HTTP_PCL   0x01000000      /* HTTP passive close mode (httpclose) = tunnel with Connection: close */
#define PR_O_HTTP_FCL   0x02000000      /* HTTP forced close mode (forceclose) */
#define PR_O_HTTP_SCL   0x03000000      /* HTTP server close mode (http-server-close) */
#define PR_O_HTTP_TUN   0x04000000      /* HTTP tunnel mode : no analysis past first request/response */
/* unassigned values : 0x05000000, 0x06000000, 0x07000000 */
#define PR_O_HTTP_MODE  0x07000000      /* MASK to retrieve the HTTP mode */
#define PR_O_TCPCHK_SSL 0x08000000	/* at least one TCPCHECK connect rule requires SSL */
#define PR_O_CONTSTATS	0x10000000	/* continous counters */
#define PR_O_HTTP_PROXY 0x20000000	/* Enable session to use HTTP proxy operations */
#define PR_O_DISABLE404 0x40000000      /* Disable a server on a 404 response to a health-check */
#define PR_O_ORGTO      0x80000000      /* insert x-original-to with destination address */

/* bits for proxy->options2 */
#define PR_O2_SPLIC_REQ	0x00000001      /* transfer requests using linux kernel's splice() */
#define PR_O2_SPLIC_RTR	0x00000002      /* transfer responses using linux kernel's splice() */
#define PR_O2_SPLIC_AUT	0x00000004      /* automatically use linux kernel's splice() */
#define PR_O2_SPLIC_ANY	(PR_O2_SPLIC_REQ|PR_O2_SPLIC_RTR|PR_O2_SPLIC_AUT)
#define PR_O2_REQBUG_OK	0x00000008      /* let buggy requests pass through */
#define PR_O2_RSPBUG_OK	0x00000010      /* let buggy responses pass through */
#define PR_O2_NOLOGNORM	0x00000020      /* don't log normal traffic, only errors and retries */
#define PR_O2_LOGERRORS	0x00000040      /* log errors and retries at level LOG_ERR */
#define PR_O2_SMARTACC 	0x00000080      /* don't immediately ACK request after accept */
#define PR_O2_SMARTCON 	0x00000100      /* don't immediately send empty ACK after connect */
#define PR_O2_RDPC_PRST	0x00000200      /* Actvate rdp cookie analyser */
#define PR_O2_CLFLOG	0x00000400      /* log into clf format */
#define PR_O2_LOGHCHKS	0x00000800	/* log health checks */
#define PR_O2_INDEPSTR	0x00001000	/* independent streams, don't update rex on write */
#define PR_O2_SOCKSTAT	0x00002000	/* collect & provide separate statistics for sockets */

/* appsession */
#define PR_O2_AS_REQL	0x00004000      /* learn the session id from the request */
#define PR_O2_AS_PFX	0x00008000      /* match on the cookie prefix */

/* Encoding of appsession cookie matching modes : 2 possible values => 1 bit */
#define PR_O2_AS_M_PP	0x00000000      /* path-parameters mode (the default mode) */
#define PR_O2_AS_M_QS	0x00010000      /* query-string mode */
#define PR_O2_AS_M_ANY	0x00010000      /* mask covering all PR_O2_AS_M_* values */
#define PR_O2_NODELAY   0x00020000      /* fully interactive mode, never delay outgoing data */
#define PR_O2_USE_PXHDR 0x00040000      /* use Proxy-Connection for proxy requests */
#define PR_O2_CHK_SNDST 0x00080000      /* send the state of each server along with HTTP health checks */

#define PR_O2_SRC_ADDR	0x00100000	/* get the source ip and port for logs */

#define PR_O2_FAKE_KA   0x00200000      /* pretend we do keep-alive with server eventhough we close */
/* unused: 0x00400000 */
#define PR_O2_EXP_NONE  0x00000000      /* http-check : no expect rule */
#define PR_O2_EXP_STS   0x00800000      /* http-check expect status */
#define PR_O2_EXP_RSTS  0x01000000      /* http-check expect rstatus */
#define PR_O2_EXP_STR   0x01800000      /* http-check expect string */
#define PR_O2_EXP_RSTR  0x02000000      /* http-check expect rstring */
#define PR_O2_EXP_TYPE  0x03800000      /* mask for http-check expect type */
#define PR_O2_EXP_INV   0x04000000      /* http-check expect !<rule> */
/* unused: 0x08000000 */

/* server health checks */
#define PR_O2_CHK_NONE  0x00000000      /* no L7 health checks configured (TCP by default) */
#define PR_O2_PGSQL_CHK 0x10000000      /* use PGSQL check for server health */
#define PR_O2_REDIS_CHK 0x20000000      /* use LDAP check for server health */
#define PR_O2_SMTP_CHK  0x30000000      /* use SMTP EHLO check for server health - pvandijk@vision6.com.au */
#define PR_O2_HTTP_CHK  0x40000000      /* use HTTP 'OPTIONS' method to check server health */
#define PR_O2_MYSQL_CHK 0x50000000      /* use MYSQL check for server health */
#define PR_O2_LDAP_CHK  0x60000000      /* use LDAP check for server health */
#define PR_O2_SSL3_CHK  0x70000000      /* use SSLv3 CLIENT_HELLO packets for server health */
#define PR_O2_LB_AGENT_CHK 0x80000000   /* use a TCP connection to obtain a metric of server health */
#define PR_O2_TCPCHK_CHK 0x90000000     /* use TCPCHK check for server health */
#define PR_O2_EXT_CHK   0xA0000000      /* use external command for server health */
/* unused: 0xB0000000 to 0xF000000, reserved for health checks */
#define PR_O2_CHK_ANY   0xF0000000      /* Mask to cover any check */
/* end of proxy->options2 */

/* Cookie settings for pr->ck_opts */
#define PR_CK_RW        0x00000001      /* rewrite all direct cookies with the right serverid */
#define PR_CK_IND       0x00000002      /* keep only indirect cookies */
#define PR_CK_INS       0x00000004      /* insert cookies when not accessing a server directly */
#define PR_CK_PFX       0x00000008      /* rewrite all cookies by prefixing the right serverid */
#define PR_CK_ANY       (PR_CK_RW | PR_CK_IND | PR_CK_INS | PR_CK_PFX)
#define PR_CK_NOC       0x00000010      /* add a 'Cache-control' header with the cookie */
#define PR_CK_POST      0x00000020      /* don't insert cookies for requests other than a POST */
#define PR_CK_PSV       0x00000040      /* cookie ... preserve */
#define PR_CK_HTTPONLY  0x00000080      /* emit the "HttpOnly" attribute */
#define PR_CK_SECURE    0x00000100      /* emit the "Secure" attribute */

/* bits for sticking rules */
#define STK_IS_MATCH	0x00000001	/* match on request fetch */
#define STK_IS_STORE	0x00000002	/* store on request fetch */
#define STK_ON_RSP	0x00000004	/* store on response fetch */

struct error_snapshot {
	struct timeval when;		/* date of this event, (tv_sec == 0) means "never" */
	unsigned int len;		/* original length of the last invalid request/response */
	unsigned int pos;		/* position of the first invalid character */
	unsigned int sid;		/* ID of the faulty session */
	unsigned int ev_id;		/* event number (counter incremented for each capture) */
	unsigned int state;		/* message state before the error (when saved) */
	unsigned int b_flags;		/* buffer flags */
	unsigned int s_flags;		/* session flags */
	unsigned int t_flags;		/* transaction flags */
	unsigned int m_flags;		/* message flags */
	unsigned int b_out;		/* pending output bytes */
	unsigned int b_wrap;		/* position where the buffer is expected to wrap */
	unsigned long long b_tot;	/* total bytes transferred via this buffer */
	unsigned long long m_clen;	/* chunk len for this message */
	unsigned long long m_blen;	/* body len for this message */
	struct server *srv;		/* server associated with the error (or NULL) */
	struct proxy *oe;		/* other end = frontend or backend involved */
	struct sockaddr_storage src;	/* client's address */
	char buf[BUFSIZE];		/* copy of the beginning of the message */
};

struct proxy {
	enum obj_type obj_type;                 /* object type == OBJ_TYPE_PROXY */
	enum pr_state state;                    /* proxy state, one of PR_* */
	enum pr_mode mode;                      /* mode = PR_MODE_TCP, PR_MODE_HTTP or PR_MODE_HEALTH */
	char cap;                               /* supported capabilities (PR_CAP_*) */
	unsigned int maxconn;                   /* max # of active sessions on the frontend */

	int options;				/* PR_O_REDISP, PR_O_TRANSP, ... */
	int options2;				/* PR_O2_* */
	struct in_addr mon_net, mon_mask;	/* don't forward connections from this net (network order) FIXME: should support IPv6 */
	unsigned int ck_opts;			/* PR_CK_* (cookie options) */
	unsigned int fe_req_ana, be_req_ana;	/* bitmap of common request protocol analysers for the frontend and backend */
	unsigned int fe_rsp_ana, be_rsp_ana;	/* bitmap of common response protocol analysers for the frontend and backend */
	unsigned int http_needed;               /* non-null if HTTP analyser may be used */
	union {
		struct proxy *be;		/* default backend, or NULL if none set */
		char *name;			/* default backend name during config parse */
	} defbe;
	struct list acl;                        /* ACL declared on this proxy */
	struct list http_req_rules;		/* HTTP request rules: allow/deny/... */
	struct list http_res_rules;		/* HTTP response rules: allow/deny/... */
	struct list block_rules;                /* http-request block rules to be inserted before other ones */
	struct list redirect_rules;             /* content redirecting rules (chained) */
	struct list switching_rules;            /* content switching rules (chained) */
	struct list persist_rules;		/* 'force-persist' and 'ignore-persist' rules (chained) */
	struct list sticking_rules;             /* content sticking rules (chained) */
	struct list storersp_rules;             /* content store response rules (chained) */
	struct list server_rules;               /* server switching rules (chained) */
	struct {                                /* TCP request processing */
		unsigned int inspect_delay;     /* inspection delay */
		struct list inspect_rules;      /* inspection rules */
		struct list l4_rules;           /* layer4 rules */
	} tcp_req;
	struct {                                /* TCP request processing */
		unsigned int inspect_delay;     /* inspection delay */
		struct list inspect_rules;      /* inspection rules */
	} tcp_rep;
	struct server *srv, defsrv;		/* known servers; default server configuration */
	int srv_act, srv_bck;			/* # of servers eligible for LB (UP|!checked) AND (enabled+weight!=0) */
	struct lbprm lbprm;			/* load-balancing parameters */
	char *cookie_domain;			/* domain used to insert the cookie */
	char *cookie_name;			/* name of the cookie to look for */
	int  cookie_len;			/* strlen(cookie_name), computed only once */
	unsigned int cookie_maxidle;		/* max idle time for this cookie */
	unsigned int cookie_maxlife;		/* max life time for this cookie */
	int  rdp_cookie_len;			/* strlen(rdp_cookie_name), computed only once */
	char *rdp_cookie_name;			/* name of the RDP cookie to look for */
	char *url_param_name;			/* name of the URL parameter used for hashing */
	int  url_param_len;			/* strlen(url_param_name), computed only once */
	int  uri_len_limit;			/* character limit for uri balancing algorithm */
	int  uri_dirs_depth1;			/* directories+1 (slashes) limit for uri balancing algorithm */
	int  uri_whole;				/* if != 0, calculates the hash from the whole uri. Still honors the len_limit and dirs_depth1 */
	char *hh_name;				/* name of the header parameter used for hashing */
	int  hh_len;				/* strlen(hh_name), computed only once */
	int  hh_match_domain;			/* toggle use of special match function */
	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 */
	struct appsession_hash 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 */
	struct uri_auth *uri_auth;		/* if non-NULL, the (list of) per-URI authentications */
	int max_ka_queue;			/* 1+maximum requests in queue accepted for reusing a K-A conn (0=none) */
	int monitor_uri_len;			/* length of the string above. 0 if unused */
	char *monitor_uri;			/* a special URI to which we respond with HTTP/200 OK */
	struct list mon_fail_cond;              /* list of conditions to fail monitoring requests (chained) */
	struct {				/* WARNING! check proxy_reset_timeouts() in proxy.h !!! */
		int client;                     /* client I/O timeout (in ticks) */
		int tarpit;                     /* tarpit timeout, defaults to connect if unspecified */
		int queue;                      /* queue timeout, defaults to connect if unspecified */
		int connect;                    /* connect timeout (in ticks) */
		int server;                     /* server I/O timeout (in ticks) */
		int appsession;                 /* appsession cookie expiration */
		int httpreq;                    /* maximum time for complete HTTP request */
		int httpka;                     /* maximum time for a new HTTP request when using keep-alive */
		int check;                      /* maximum time for complete check */
		int tunnel;                     /* I/O timeout to use in tunnel mode (in ticks) */
		int clientfin;                  /* timeout to apply to client half-closed connections */
		int serverfin;                  /* timeout to apply to server half-closed connections */
	} timeout;
	char *id, *desc;			/* proxy id (name) and description */
	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) */
	unsigned int feconn, beconn;		/* # of active frontend and backends sessions */
	struct freq_ctr fe_req_per_sec;		/* HTTP requests per second on the frontend */
	struct freq_ctr fe_conn_per_sec;	/* received connections per second on the frontend */
	struct freq_ctr fe_sess_per_sec;	/* accepted sessions per second on the frontend (after tcp rules) */
	struct freq_ctr be_sess_per_sec;	/* sessions per second on the backend */
	unsigned int fe_sps_lim;		/* limit on new sessions per second on the frontend */
	unsigned int fullconn;			/* #conns on backend above which servers are used at full load */
	struct in_addr except_net, except_mask; /* don't x-forward-for for this address. FIXME: should support IPv6 */
	struct in_addr except_to;		/* don't x-original-to for this address. */
	struct in_addr except_mask_to;		/* the netmask for except_to. */
	char *fwdfor_hdr_name;			/* header to use - default: "x-forwarded-for" */
	char *orgto_hdr_name;			/* header to use - default: "x-original-to" */
	int fwdfor_hdr_len;			/* length of "x-forwarded-for" header */
	int orgto_hdr_len;			/* length of "x-original-to" header */
	char *server_id_hdr_name;                   /* the header to use to send the server id (name) */
	int server_id_hdr_len;                      /* the length of the id (name) header... name */
	int conn_retries;			/* maximum number of connect retries */
	unsigned down_trans;			/* up-down transitions */
	unsigned down_time;			/* total time the proxy was down */
	time_t last_change;			/* last time, when the state was changed */
	int (*accept)(struct session *s);       /* application layer's accept() */
	struct conn_src conn_src;               /* connection source settings */
	struct proxy *next;

	unsigned int log_count;			/* number of logs produced by the frontend */
	struct list logsrvs;
	struct list logformat; 			/* log_format linked list */
	char *header_unique_id; 		/* unique-id header */
	struct list format_unique_id;		/* unique-id format */
	int to_log;				/* things to be logged (LW_*) */
	int stop_time;                          /* date to stop listening, when stopping != 0 (int ticks) */
	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 */
	struct pool_head *req_cap_pool,		/* pools of pre-allocated char ** used to build the sessions */
	                 *rsp_cap_pool;
	struct list req_add, rsp_add;           /* headers to be added */
	struct pxcounters be_counters;		/* backend statistics counters */
	struct pxcounters fe_counters;		/* frontend statistics counters */

	struct list listener_queue;		/* list of the temporarily limited listeners because of lack of a proxy resource */
	struct stktable table;			/* table for storing sticking sessions */

	struct task *task;			/* the associated task, mandatory to manage rate limiting, stopping and resource shortage, NULL if disabled */
	struct list tcpcheck_rules;		/* tcp-check send / expect rules */
	int grace;				/* grace time after stop request */
	int check_len;				/* Length of the HTTP or SSL3 request */
	char *check_req;			/* HTTP or SSL request to use for PR_O_HTTP_CHK|PR_O_SSL3_CHK */
	char *check_command;			/* Command to use for external agent checks */
	char *check_path;			/* PATH environment to use for external agent checks */
	char *expect_str;			/* http-check expected content : string or text version of the regex */
	struct my_regex *expect_regex;		/* http-check expected content */
	struct chunk errmsg[HTTP_ERR_SIZE];	/* default or customized error messages for known errors */
	int uuid;				/* universally unique proxy ID, used for SNMP */
	unsigned int backlog;			/* force the frontend's listen backlog */
	unsigned long bind_proc;		/* bitmask of processes using this proxy */

	/* warning: these structs are huge, keep them at the bottom */
	struct sockaddr_storage dispatch_addr;	/* the default address to connect to */
	struct error_snapshot invalid_req, invalid_rep; /* captures of last errors */

	/* used only during configuration parsing */
	int no_options;				/* PR_O_REDISP, PR_O_TRANSP, ... */
	int no_options2;			/* PR_O2_* */

	struct {
		char *file;			/* file where the section appears */
		int line;			/* line where the section appears */
		struct eb32_node id;		/* place in the tree of used IDs */
		struct eb_root used_listener_id;/* list of listener IDs in use */
		struct eb_root used_server_id;	/* list of server IDs in use */
		struct list bind;		/* list of bind settings */
		struct list listeners;		/* list of listeners belonging to this frontend */
		struct arg_list args;           /* sample arg list that need to be resolved */
		struct ebpt_node by_name;       /* proxies are stored sorted by name here */
		char *logformat_string;		/* log format string */
		char *lfs_file;                 /* file name where the logformat string appears (strdup) */
		int   lfs_line;                 /* file name where the logformat string appears */
		int   uif_line;                 /* file name where the unique-id-format string appears */
		char *uif_file;                 /* file name where the unique-id-format string appears (strdup) */
		char *uniqueid_format_string;	/* unique-id format string */
	} conf;					/* config information */
	void *parent;				/* parent of the proxy when applicable */
	struct comp *comp;			/* http compression */
};

struct switching_rule {
	struct list list;			/* list linked to from the proxy */
	struct acl_cond *cond;			/* acl condition to meet */
	int dynamic;				/* this is a dynamic rule using the logformat expression */
	union {
		struct proxy *backend;		/* target backend */
		char *name;			/* target backend name during config parsing */
		struct list expr;		/* logformat expression to use for dynamic rules */
	} be;
};

struct server_rule {
	struct list list;			/* list linked to from the proxy */
	struct acl_cond *cond;			/* acl condition to meet */
	union {
		struct server *ptr;		/* target server */
		char *name;			/* target server name during config parsing */
	} srv;
};

struct persist_rule {
	struct list list;			/* list linked to from the proxy */
	struct acl_cond *cond;			/* acl condition to meet */
	int type;
};

struct sticking_rule {
	struct list list;                       /* list linked to from the proxy */
	struct acl_cond *cond;                  /* acl condition to meet */
	struct sample_expr *expr;               /* fetch expr to fetch key */
	int flags;                              /* STK_* */
	union {
		struct stktable *t;	        /* target table */
		char *name;                     /* target table name during config parsing */
	} table;
};


struct redirect_rule {
	struct list list;                       /* list linked to from the proxy */
	struct acl_cond *cond;                  /* acl condition to meet */
	int type;
	int rdr_len;
	char *rdr_str;
	struct list rdr_fmt;
	int code;
	unsigned int flags;
	int cookie_len;
	char *cookie_str;
};

#endif /* _TYPES_PROXY_H */

/*
 * Local variables:
 *  c-indent-level: 8
 *  c-basic-offset: 8
 * End:
 */