src/haproxy.c

/*
 * HAProxy : High Availability-enabled HTTP/TCP proxy
 * Copyright 2000-2022 Willy Tarreau <willy@haproxy.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 RFC7230 - RFC7235 information about HTTP protocol, and
 * RFC6265 for information 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.
 *
 */

#define _GNU_SOURCE
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <ctype.h>
#include <dirent.h>
#include <sys/stat.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 <sys/utsname.h>
#include <sys/wait.h>
#include <time.h>
#include <syslog.h>
#include <grp.h>

#ifdef USE_THREAD
#include <pthread.h>
#endif

#ifdef USE_CPU_AFFINITY
#include <sched.h>
#if defined(__FreeBSD__) || defined(__DragonFly__)
#include <sys/param.h>
#ifdef __FreeBSD__
#include <sys/cpuset.h>
#endif
#endif
#endif

#if defined(USE_PRCTL)
#include <sys/prctl.h>
#endif

#if defined(USE_PROCCTL)
#include <sys/procctl.h>
#endif

#ifdef DEBUG_FULL
#include <assert.h>
#endif
#if defined(USE_SYSTEMD)
#include <systemd/sd-daemon.h>
#endif

#include <import/sha1.h>

#include <haproxy/acl.h>
#include <haproxy/action.h>
#include <haproxy/activity.h>
#include <haproxy/api.h>
#include <haproxy/arg.h>
#include <haproxy/auth.h>
#include <haproxy/base64.h>
#include <haproxy/capture-t.h>
#include <haproxy/cfgcond.h>
#include <haproxy/cfgdiag.h>
#include <haproxy/cfgparse.h>
#include <haproxy/chunk.h>
#include <haproxy/cli.h>
#include <haproxy/clock.h>
#include <haproxy/connection.h>
#ifdef USE_CPU_AFFINITY
#include <haproxy/cpuset.h>
#endif
#include <haproxy/dns.h>
#include <haproxy/dynbuf.h>
#include <haproxy/errors.h>
#include <haproxy/fd.h>
#include <haproxy/filters.h>
#include <haproxy/global.h>
#include <haproxy/hlua.h>
#include <haproxy/http_rules.h>
#include <haproxy/list.h>
#include <haproxy/listener.h>
#include <haproxy/log.h>
#include <haproxy/mworker.h>
#include <haproxy/namespace.h>
#include <haproxy/net_helper.h>
#include <haproxy/openssl-compat.h>
#include <haproxy/pattern.h>
#include <haproxy/peers.h>
#include <haproxy/pool.h>
#include <haproxy/protocol.h>
#include <haproxy/proto_tcp.h>
#include <haproxy/proxy.h>
#include <haproxy/regex.h>
#include <haproxy/sample.h>
#include <haproxy/server.h>
#include <haproxy/session.h>
#include <haproxy/signal.h>
#include <haproxy/sock.h>
#include <haproxy/sock_inet.h>
#include <haproxy/ssl_sock.h>
#include <haproxy/stats-t.h>
#include <haproxy/stream.h>
#include <haproxy/task.h>
#include <haproxy/thread.h>
#include <haproxy/time.h>
#include <haproxy/tools.h>
#include <haproxy/uri_auth-t.h>
#include <haproxy/vars.h>
#include <haproxy/version.h>


/* array of init calls for older platforms */
DECLARE_INIT_STAGES;

/* create a read_mostly section to hold variables which are accessed a lot
 * but which almost never change. The purpose is to isolate them in their
 * own cache lines where they don't risk to be perturbated by write accesses
 * to neighbor variables. We need to create an empty aligned variable for
 * this. The fact that the variable is of size zero means that it will be
 * eliminated at link time if no other variable uses it, but alignment will
 * be respected.
 */
empty_t __read_mostly_align HA_SECTION("read_mostly") ALIGNED(64);

#ifdef BUILD_FEATURES
const char *build_features = BUILD_FEATURES;
#else
const char *build_features = "";
#endif

/* list of config files */
static struct list cfg_cfgfiles = LIST_HEAD_INIT(cfg_cfgfiles);
int  pid;			/* current process id */

volatile unsigned long sleeping_thread_mask = 0; /* Threads that are about to sleep in poll() */
volatile unsigned long stopping_thread_mask = 0; /* Threads acknowledged stopping */

/* global options */
struct global global = {
	.hard_stop_after = TICK_ETERNITY,
	.close_spread_time = TICK_ETERNITY,
	.close_spread_end = TICK_ETERNITY,
	.numa_cpu_mapping = 1,
	.nbthread = 0,
	.req_count = 0,
	.logsrvs = LIST_HEAD_INIT(global.logsrvs),
	.maxzlibmem = 0,
	.comp_rate_lim = 0,
	.ssl_server_verify = SSL_SERVER_VERIFY_REQUIRED,
	.unix_bind = {
		 .ux = {
			 .uid = -1,
			 .gid = -1,
			 .mode = 0,
		 }
	},
	.tune = {
		.options = GTUNE_LISTENER_MQ,
		.bufsize = (BUFSIZE + 2*sizeof(void *) - 1) & -(2*sizeof(void *)),
		.maxrewrite = MAXREWRITE,
		.reserved_bufs = RESERVED_BUFS,
		.pattern_cache = DEFAULT_PAT_LRU_SIZE,
		.pool_low_ratio  = 20,
		.pool_high_ratio = 25,
		.max_http_hdr = MAX_HTTP_HDR,
#ifdef USE_OPENSSL
		.sslcachesize = SSLCACHESIZE,
#endif
		.comp_maxlevel = 1,
#ifdef DEFAULT_IDLE_TIMER
		.idle_timer = DEFAULT_IDLE_TIMER,
#else
		.idle_timer = 1000, /* 1 second */
#endif
	},
#ifdef USE_OPENSSL
#ifdef DEFAULT_MAXSSLCONN
	.maxsslconn = DEFAULT_MAXSSLCONN,
#endif
#endif
	/* others NULL OK */
};

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

int stopping;	/* non zero means stopping in progress */
int killed;	/* non zero means a hard-stop is triggered */
int jobs = 0;   /* number of active jobs (conns, listeners, active tasks, ...) */
int unstoppable_jobs = 0;  /* number of active jobs that can't be stopped during a soft stop */
int active_peers = 0; /* number of active peers (connection attempts and connected) */
int connected_peers = 0; /* number of connected peers (verified ones) */
int arg_mode = 0;	/* MODE_DEBUG etc as passed on command line ... */
char *change_dir = NULL; /* set when -C is passed */
char *check_condition = NULL; /* check condition passed to -cc */

/* Here we store information 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 *oldpids = NULL;
static int oldpids_sig; /* use USR1 or TERM */

/* Path to the unix socket we use to retrieve listener sockets from the old process */
static const char *old_unixsocket;

int atexit_flag = 0;

int nb_oldpids = 0;
const int zero = 0;
const int one = 1;
const struct linger nolinger = { .l_onoff = 1, .l_linger = 0 };

char hostname[MAX_HOSTNAME_LEN];
char *localpeer = NULL;
static char *kwd_dump = NULL; // list of keyword dumps to produce

static char **old_argv = NULL; /* previous argv but cleaned up */

struct list proc_list = LIST_HEAD_INIT(proc_list);

int master = 0; /* 1 if in master, 0 if in child */
unsigned int rlim_fd_cur_at_boot = 0;
unsigned int rlim_fd_max_at_boot = 0;

/* per-boot randomness */
unsigned char boot_seed[20];        /* per-boot random seed (160 bits initially) */

/* takes the thread config in argument or NULL for any thread */
static void *run_thread_poll_loop(void *data);

/* bitfield of a few warnings to emit just once (WARN_*) */
unsigned int warned = 0;

/* set if experimental features have been used for the current process */
unsigned int tainted = 0;

unsigned int experimental_directives_allowed = 0;

int check_kw_experimental(struct cfg_keyword *kw, const char *file, int linenum,
                          char **errmsg)
{
	if (kw->flags & KWF_EXPERIMENTAL) {
		if (!experimental_directives_allowed) {
			memprintf(errmsg, "parsing [%s:%d] : '%s' directive is experimental, must be allowed via a global 'expose-experimental-directives'",
			          file, linenum, kw->kw);
			return 1;
		}
		mark_tainted(TAINTED_CONFIG_EXP_KW_DECLARED);
	}

	return 0;
}

/* master CLI configuration (-S flag) */
struct list mworker_cli_conf = LIST_HEAD_INIT(mworker_cli_conf);

/* These are strings to be reported in the output of "haproxy -vv". They may
 * either be constants (in which case must_free must be zero) or dynamically
 * allocated strings to pass to free() on exit, and in this case must_free
 * must be non-zero.
 */
struct list build_opts_list = LIST_HEAD_INIT(build_opts_list);
struct build_opts_str {
	struct list list;
	const char *str;
	int must_free;
};

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

/* used to register some build option strings at boot. Set must_free to
 * non-zero if the string must be freed upon exit.
 */
void hap_register_build_opts(const char *str, int must_free)
{
	struct build_opts_str *b;

	b = calloc(1, sizeof(*b));
	if (!b) {
		fprintf(stderr, "out of memory\n");
		exit(1);
	}
	b->str = str;
	b->must_free = must_free;
	LIST_APPEND(&build_opts_list, &b->list);
}

#define VERSION_MAX_ELTS  7

/* This function splits an haproxy version string into an array of integers.
 * The syntax of the supported version string is the following:
 *
 *    <a>[.<b>[.<c>[.<d>]]][-{dev,pre,rc}<f>][-*][-<g>]
 *
 * This validates for example:
 *   1.2.1-pre2, 1.2.1, 1.2.10.1, 1.3.16-rc1, 1.4-dev3, 1.5-dev18, 1.5-dev18-43
 *   2.4-dev18-f6818d-20
 *
 * The result is set in a array of <VERSION_MAX_ELTS> elements. Each letter has
 * one fixed place in the array. The tags take a numeric value called <e> which
 * defaults to 3. "dev" is 1, "rc" and "pre" are 2. Numbers not encountered are
 * considered as zero (henxe 1.5 and 1.5.0 are the same).
 *
 * The resulting values are:
 *   1.2.1-pre2            1, 2,  1, 0, 2,  2,  0
 *   1.2.1                 1, 2,  1, 0, 3,  0,  0
 *   1.2.10.1              1, 2, 10, 1, 3,  0,  0
 *   1.3.16-rc1            1, 3, 16, 0, 2,  1,  0
 *   1.4-dev3              1, 4,  0, 0, 1,  3,  0
 *   1.5-dev18             1, 5,  0, 0, 1, 18,  0
 *   1.5-dev18-43          1, 5,  0, 0, 1, 18, 43
 *   2.4-dev18-f6818d-20   2, 4,  0, 0, 1, 18, 20
 *
 * The function returns non-zero if the conversion succeeded, or zero if it
 * failed.
 */
int split_version(const char *version, unsigned int *value)
{
	const char *p, *s;
	char *error;
	int nelts;

	/* Initialize array with zeroes */
	for (nelts = 0; nelts < VERSION_MAX_ELTS; nelts++)
		value[nelts] = 0;
	value[4] = 3;

	p = version;

	/* If the version number is empty, return false */
	if (*p == '\0')
		return 0;

	/* Convert first number <a> */
	value[0] = strtol(p, &error, 10);
	p = error + 1;
	if (*error == '\0')
		return 1;
	if (*error == '-')
		goto split_version_tag;
	if (*error != '.')
		return 0;

	/* Convert first number <b> */
	value[1] = strtol(p, &error, 10);
	p = error + 1;
	if (*error == '\0')
		return 1;
	if (*error == '-')
		goto split_version_tag;
	if (*error != '.')
		return 0;

	/* Convert first number <c> */
	value[2] = strtol(p, &error, 10);
	p = error + 1;
	if (*error == '\0')
		return 1;
	if (*error == '-')
		goto split_version_tag;
	if (*error != '.')
		return 0;

	/* Convert first number <d> */
	value[3] = strtol(p, &error, 10);
	p = error + 1;
	if (*error == '\0')
		return 1;
	if (*error != '-')
		return 0;

 split_version_tag:
	/* Check for commit number */
	if (*p >= '0' && *p <= '9')
		goto split_version_commit;

	/* Read tag */
	if (strncmp(p, "dev", 3) == 0)      { value[4] = 1; p += 3; }
	else if (strncmp(p, "rc", 2) == 0)  { value[4] = 2; p += 2; }
	else if (strncmp(p, "pre", 3) == 0) { value[4] = 2; p += 3; }
	else
		goto split_version_commit;

	/* Convert tag number */
	value[5] = strtol(p, &error, 10);
	p = error + 1;
	if (*error == '\0')
		return 1;
	if (*error != '-')
		return 0;

 split_version_commit:
	/* Search the last "-" */
	s = strrchr(p, '-');
	if (s) {
		s++;
		if (*s == '\0')
			return 0;
		value[6] = strtol(s, &error, 10);
		if (*error != '\0')
			value[6] = 0;
		return 1;
	}

	/* convert the version */
	value[6] = strtol(p, &error, 10);
	if (*error != '\0')
		value[6] = 0;

	return 1;
}

/* This function compares the current haproxy version with an arbitrary version
 * string. It returns:
 *  -1 : the version in argument is older than the current haproxy version
 *   0 : the version in argument is the same as the current haproxy version
 *   1 : the version in argument is newer than the current haproxy version
 *
 * Or some errors:
 *  -2 : the current haproxy version is not parsable
 *  -3 : the version in argument is not parsable
 */
int compare_current_version(const char *version)
{
	unsigned int loc[VERSION_MAX_ELTS];
	unsigned int mod[VERSION_MAX_ELTS];
	int i;

	/* split versions */
	if (!split_version(haproxy_version, loc))
		return -2;
	if (!split_version(version, mod))
		return -3;

	/* compare versions */
	for (i = 0; i < VERSION_MAX_ELTS; i++) {
		if (mod[i] < loc[i])
			return -1;
		else if (mod[i] > loc[i])
			return 1;
	}
	return 0;
}

static void display_version()
{
	struct utsname utsname;

	printf("HAProxy version %s %s - https://haproxy.org/\n"
	       PRODUCT_STATUS "\n", haproxy_version, haproxy_date);

	if (strlen(PRODUCT_URL_BUGS) > 0) {
		char base_version[20];
		int dots = 0;
		char *del;

		/* only retrieve the base version without distro-specific extensions */
		for (del = haproxy_version; *del; del++) {
			if (*del == '.')
				dots++;
			else if (*del < '0' || *del > '9')
				break;
		}

		strlcpy2(base_version, haproxy_version, del - haproxy_version + 1);
		if (dots < 2)
			printf("Known bugs: https://github.com/haproxy/haproxy/issues?q=is:issue+is:open\n");
		else
			printf("Known bugs: " PRODUCT_URL_BUGS "\n", base_version);
	}

	if (uname(&utsname) == 0) {
		printf("Running on: %s %s %s %s\n", utsname.sysname, utsname.release, utsname.version, utsname.machine);
	}
}

static void display_build_opts()
{
	struct build_opts_str *item;

	printf("Build options :"
#ifdef BUILD_TARGET
	       "\n  TARGET  = " BUILD_TARGET
#endif
#ifdef BUILD_CPU
	       "\n  CPU     = " BUILD_CPU
#endif
#ifdef BUILD_CC
	       "\n  CC      = " BUILD_CC
#endif
#ifdef BUILD_CFLAGS
	       "\n  CFLAGS  = " BUILD_CFLAGS
#endif
#ifdef BUILD_OPTIONS
	       "\n  OPTIONS = " BUILD_OPTIONS
#endif
#ifdef BUILD_DEBUG
	       "\n  DEBUG   = " BUILD_DEBUG
#endif
#ifdef BUILD_FEATURES
	       "\n\nFeature list : " BUILD_FEATURES
#endif
	       "\n\nDefault settings :"
	       "\n  bufsize = %d, maxrewrite = %d, maxpollevents = %d"
	       "\n\n",
	       BUFSIZE, MAXREWRITE, MAX_POLL_EVENTS);

	list_for_each_entry(item, &build_opts_list, list) {
		puts(item->str);
	}

	putchar('\n');

	list_pollers(stdout);
	putchar('\n');
	list_mux_proto(stdout);
	putchar('\n');
	list_services(stdout);
	putchar('\n');
	list_filters(stdout);
	putchar('\n');
}

/*
 * This function prints the command line usage and exits
 */
static void usage(char *name)
{
	display_version();
	fprintf(stderr,
		"Usage : %s [-f <cfgfile|cfgdir>]* [ -vdV"
		"D ] [ -n <maxconn> ] [ -N <maxpconn> ]\n"
		"        [ -p <pidfile> ] [ -m <max megs> ] [ -C <dir> ] [-- <cfgfile>*]\n"
		"        -v displays version ; -vv shows known build options.\n"
		"        -d enters debug mode ; -db only disables background mode.\n"
		"        -dM[<byte>,help,...] debug memory (default: poison with <byte>/0x50)\n"
		"        -V enters verbose mode (disables quiet mode)\n"
		"        -D goes daemon ; -C changes to <dir> before loading files.\n"
		"        -W master-worker mode.\n"
#if defined(USE_SYSTEMD)
		"        -Ws master-worker mode with systemd notify support.\n"
#endif
		"        -q quiet mode : don't display messages\n"
		"        -c check mode : only check config files and exit\n"
		"        -cc check condition : evaluate a condition and exit\n"
		"        -n sets the maximum total # of connections (uses ulimit -n)\n"
		"        -m limits the usable amount of memory (in MB)\n"
		"        -N sets the default, per-proxy maximum # of connections (%d)\n"
		"        -L set local peer name (default to hostname)\n"
		"        -p writes pids of all children to this file\n"
#if defined(USE_EPOLL)
		"        -de disables epoll() usage even when available\n"
#endif
#if defined(USE_KQUEUE)
		"        -dk disables kqueue() usage even when available\n"
#endif
#if defined(USE_EVPORTS)
		"        -dv disables event ports usage even when available\n"
#endif
#if defined(USE_POLL)
		"        -dp disables poll() usage even when available\n"
#endif
#if defined(USE_LINUX_SPLICE)
		"        -dS disables splice usage (broken on old kernels)\n"
#endif
#if defined(USE_GETADDRINFO)
		"        -dG disables getaddrinfo() usage\n"
#endif
#if defined(SO_REUSEPORT)
		"        -dR disables SO_REUSEPORT usage\n"
#endif
#if defined(HA_HAVE_DUMP_LIBS)
		"        -dL dumps loaded object files after config checks\n"
#endif
		"        -dK{class[,...]} dump registered keywords (use 'help' for list)\n"
		"        -dr ignores server address resolution failures\n"
		"        -dV disables SSL verify on servers side\n"
		"        -dW fails if any warning is emitted\n"
		"        -dD diagnostic mode : warn about suspicious configuration statements\n"
		"        -sf/-st [pid ]* finishes/terminates old pids.\n"
		"        -x <unix_socket> get listening sockets from a unix socket\n"
		"        -S <bind>[,<bind options>...] new master CLI\n"
		"\n",
		name, cfg_maxpconn);
	exit(1);
}



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

/* sends the signal <sig> to all pids found in <oldpids>. Returns the number of
 * pids the signal was correctly delivered to.
 */
int tell_old_pids(int sig)
{
	int p;
	int ret = 0;
	for (p = 0; p < nb_oldpids; p++)
		if (kill(oldpids[p], sig) == 0)
			ret++;
	return ret;
}

/*
 * remove a pid forom the olpid array and decrease nb_oldpids
 * return 1 pid was found otherwise return 0
 */

int delete_oldpid(int pid)
{
	int i;

	for (i = 0; i < nb_oldpids; i++) {
		if (oldpids[i] == pid) {
			oldpids[i] = oldpids[nb_oldpids - 1];
			oldpids[nb_oldpids - 1] = 0;
			nb_oldpids--;
			return 1;
		}
	}
	return 0;
}


/*
 * When called, this function reexec haproxy with -sf followed by current
 * children PIDs and possibly old children PIDs if they didn't leave yet.
 */
static void mworker_reexec()
{
	char **next_argv = NULL;
	int old_argc = 0; /* previous number of argument */
	int next_argc = 0;
	int i = 0;
	char *msg = NULL;
	struct rlimit limit;
	struct mworker_proc *current_child = NULL;

	mworker_block_signals();
#if defined(USE_SYSTEMD)
	if (global.tune.options & GTUNE_USE_SYSTEMD)
		sd_notify(0, "RELOADING=1");
#endif
	setenv("HAPROXY_MWORKER_REEXEC", "1", 1);

	mworker_cleanup_proc();
	mworker_proc_list_to_env(); /* put the children description in the env */

	/* ensure that we close correctly every listeners before reexecuting */
	mworker_cleanlisteners();

	/* during the reload we must ensure that every FDs that can't be
	 * reuse (ie those that are not referenced in the proc_list)
	 * are closed or they will leak. */

	/* close the listeners FD */
	mworker_cli_proxy_stop();

	if (fdtab)
		deinit_pollers();

#ifdef HAVE_SSL_RAND_KEEP_RANDOM_DEVICES_OPEN
	/* close random device FDs */
	RAND_keep_random_devices_open(0);
#endif

	/* restore the initial FD limits */
	limit.rlim_cur = rlim_fd_cur_at_boot;
	limit.rlim_max = rlim_fd_max_at_boot;
	if (setrlimit(RLIMIT_NOFILE, &limit) == -1) {
		getrlimit(RLIMIT_NOFILE, &limit);
		ha_warning("Failed to restore initial FD limits (cur=%u max=%u), using cur=%u max=%u\n",
			   rlim_fd_cur_at_boot, rlim_fd_max_at_boot,
			   (unsigned int)limit.rlim_cur, (unsigned int)limit.rlim_max);
	}

	/* compute length  */
	while (old_argv[old_argc])
		old_argc++;

	/* 1 for haproxy -sf, 2 for -x /socket */
	next_argv = calloc(old_argc + 1 + 2 + mworker_child_nb() + 1,
			   sizeof(*next_argv));
	if (next_argv == NULL)
		goto alloc_error;

	/* copy the program name */
	next_argv[next_argc++] = old_argv[0];

	/* insert the new options just after argv[0] in case we have a -- */

	if (getenv("HAPROXY_MWORKER_WAIT_ONLY") == NULL) {
		/* add -sf <PID>*  to argv */
		if (mworker_child_nb() > 0) {
			struct mworker_proc *child;

			next_argv[next_argc++] = "-sf";

			list_for_each_entry(child, &proc_list, list) {
				if (!(child->options & PROC_O_LEAVING) && (child->options & PROC_O_TYPE_WORKER))
					current_child = child;

				if (!(child->options & (PROC_O_TYPE_WORKER|PROC_O_TYPE_PROG)) || child->pid <= -1)
					continue;
				if ((next_argv[next_argc++] = memprintf(&msg, "%d", child->pid)) == NULL)
					goto alloc_error;
				msg = NULL;
			}
		}

		if (current_child) {
			/* add the -x option with the socketpair of the current worker */
			next_argv[next_argc++] = "-x";
			if ((next_argv[next_argc++] = memprintf(&msg, "sockpair@%d", current_child->ipc_fd[0])) == NULL)
				goto alloc_error;
			msg = NULL;
		}
	}

	/* copy the previous options */
	for (i = 1; i < old_argc; i++)
		next_argv[next_argc++] = old_argv[i];

	signal(SIGPROF, SIG_IGN);
	execvp(next_argv[0], next_argv);
	ha_warning("Failed to reexecute the master process [%d]: %s\n", pid, strerror(errno));
	ha_free(&next_argv);
	return;

alloc_error:
	ha_free(&next_argv);
	ha_warning("Failed to reexecute the master process [%d]: Cannot allocate memory\n", pid);
	return;
}

/* reexec haproxy in waitmode */
static void mworker_reexec_waitmode()
{
	setenv("HAPROXY_MWORKER_WAIT_ONLY", "1", 1);
	mworker_reexec();
}

/* reload haproxy and emit a warning */
void mworker_reload()
{
	struct mworker_proc *child;
	struct per_thread_deinit_fct *ptdf;

	ha_notice("Reloading HAProxy\n");

	/* close the poller FD and the thread waker pipe FD */
	list_for_each_entry(ptdf, &per_thread_deinit_list, list)
		ptdf->fct();

	/* increment the number of reloads */
	list_for_each_entry(child, &proc_list, list) {
		child->reloads++;
	}

	mworker_reexec();
}

static void mworker_loop()
{

#if defined(USE_SYSTEMD)
	if (global.tune.options & GTUNE_USE_SYSTEMD)
		sd_notifyf(0, "READY=1\nMAINPID=%lu", (unsigned long)getpid());
#endif
	/* Busy polling makes no sense in the master :-) */
	global.tune.options &= ~GTUNE_BUSY_POLLING;


	signal_unregister(SIGTTIN);
	signal_unregister(SIGTTOU);
	signal_unregister(SIGUSR1);
	signal_unregister(SIGHUP);
	signal_unregister(SIGQUIT);

	signal_register_fct(SIGTERM, mworker_catch_sigterm, SIGTERM);
	signal_register_fct(SIGUSR1, mworker_catch_sigterm, SIGUSR1);
	signal_register_fct(SIGTTIN, mworker_broadcast_signal, SIGTTIN);
	signal_register_fct(SIGTTOU, mworker_broadcast_signal, SIGTTOU);
	signal_register_fct(SIGINT, mworker_catch_sigterm, SIGINT);
	signal_register_fct(SIGHUP, mworker_catch_sighup, SIGHUP);
	signal_register_fct(SIGUSR2, mworker_catch_sighup, SIGUSR2);
	signal_register_fct(SIGCHLD, mworker_catch_sigchld, SIGCHLD);

	mworker_unblock_signals();
	mworker_cleantasks();

	mworker_catch_sigchld(NULL); /* ensure we clean the children in case
				     some SIGCHLD were lost */

	global.nbthread = 1;

#ifdef USE_THREAD
	tid_bit = 1;
	all_threads_mask = 1;
#endif

	jobs++; /* this is the "master" job, we want to take care of the
		signals even if there is no listener so the poll loop don't
		leave */

	fork_poller();
	run_thread_poll_loop(NULL);
}

/*
 * Reexec the process in failure mode, instead of exiting
 */
void reexec_on_failure()
{
	struct mworker_proc *child;

	if (!atexit_flag)
		return;

	/* get the info of the children in the env */
	if (mworker_env_to_proc_list() < 0) {
		exit(EXIT_FAILURE);
	}

	/* increment the number of failed reloads */
	list_for_each_entry(child, &proc_list, list) {
		child->failedreloads++;
	}

	/* do not keep unused FDs retrieved from the previous process */
	sock_drop_unused_old_sockets();

	usermsgs_clr(NULL);
	ha_warning("Loading failure!\n");
	mworker_reexec_waitmode();
}


/*
 * upon SIGUSR1, let's have a soft stop. Note that soft_stop() broadcasts
 * a signal zero to all subscribers. This means that it's as easy as
 * subscribing to signal 0 to get informed about an imminent shutdown.
 */
static void sig_soft_stop(struct sig_handler *sh)
{
	soft_stop();
	signal_unregister_handler(sh);
	pool_gc(NULL);
}

/*
 * upon SIGTTOU, we pause everything
 */
static void sig_pause(struct sig_handler *sh)
{
	if (protocol_pause_all() & ERR_FATAL) {
		const char *msg = "Some proxies refused to pause, performing soft stop now.\n";
		ha_warning("%s", msg);
		send_log(NULL, LOG_WARNING, "%s", msg);
		soft_stop();
	}
	pool_gc(NULL);
}

/*
 * upon SIGTTIN, let's have a soft stop.
 */
static void sig_listen(struct sig_handler *sh)
{
	if (protocol_resume_all() & ERR_FATAL) {
		const char *msg = "Some proxies refused to resume, probably due to a conflict on a listening port. You may want to try again after the conflicting application is stopped, otherwise a restart might be needed to resume safe operations.\n";
		ha_warning("%s", msg);
		send_log(NULL, LOG_WARNING, "%s", msg);
	}
}

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

	ha_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) {
			chunk_printf(&trash,
			             "SIGHUP: Server %s/%s is %s. Conn: %d act, %d pend, %lld tot.",
			             p->id, s->id,
			             (s->cur_state != SRV_ST_STOPPED) ? "UP" : "DOWN",
			             s->cur_sess, s->queue.length, s->counters.cum_sess);
			ha_warning("%s\n", trash.area);
			send_log(p, LOG_NOTICE, "%s\n", trash.area);
			s = s->next;
		}

		/* FIXME: those info are a bit outdated. We should be able to distinguish between FE and BE. */
		if (!p->srv) {
			chunk_printf(&trash,
			             "SIGHUP: Proxy %s has no servers. Conn: act(FE+BE): %d+%d, %d pend (%d unass), tot(FE+BE): %lld+%lld.",
			             p->id,
			             p->feconn, p->beconn, p->totpend, p->queue.length, p->fe_counters.cum_conn, p->be_counters.cum_conn);
		} else if (p->srv_act == 0) {
			chunk_printf(&trash,
			             "SIGHUP: Proxy %s %s ! Conn: act(FE+BE): %d+%d, %d pend (%d unass), tot(FE+BE): %lld+%lld.",
			             p->id,
			             (p->srv_bck) ? "is running on backup servers" : "has no server available",
			             p->feconn, p->beconn, p->totpend, p->queue.length, p->fe_counters.cum_conn, p->be_counters.cum_conn);
		} else {
			chunk_printf(&trash,
			             "SIGHUP: Proxy %s has %d active servers and %d backup servers available."
			             " Conn: act(FE+BE): %d+%d, %d pend (%d unass), tot(FE+BE): %lld+%lld.",
			             p->id, p->srv_act, p->srv_bck,
			             p->feconn, p->beconn, p->totpend, p->queue.length, p->fe_counters.cum_conn, p->be_counters.cum_conn);
		}
		ha_warning("%s\n", trash.area);
		send_log(p, LOG_NOTICE, "%s\n", trash.area);

		p = p->next;
	}
}

static void dump(struct sig_handler *sh)
{
	/* dump memory usage then free everything possible */
	dump_pools();
	pool_gc(NULL);
}

/*
 *  This function dup2 the stdio FDs (0,1,2) with <fd>, then closes <fd>
 *  If <fd> < 0, it opens /dev/null and use it to dup
 *
 *  In the case of chrooting, you have to open /dev/null before the chroot, and
 *  pass the <fd> to this function
 */
static void stdio_quiet(int fd)
{
	if (fd < 0)
		fd = open("/dev/null", O_RDWR, 0);

	if (fd > -1) {
		fclose(stdin);
		fclose(stdout);
		fclose(stderr);

		dup2(fd, 0);
		dup2(fd, 1);
		dup2(fd, 2);
		if (fd > 2)
			close(fd);
		return;
	}

	ha_alert("Cannot open /dev/null\n");
	exit(EXIT_FAILURE);
}


/* This function checks if cfg_cfgfiles contains directories.
 * If it finds one, it adds all the files (and only files) it contains
 * in cfg_cfgfiles in place of the directory (and removes the directory).
 * It adds the files in lexical order.
 * It adds only files with .cfg extension.
 * It doesn't add files with name starting with '.'
 */
static void cfgfiles_expand_directories(void)
{
	struct wordlist *wl, *wlb;
	char *err = NULL;

	list_for_each_entry_safe(wl, wlb, &cfg_cfgfiles, list) {
		struct stat file_stat;
		struct dirent **dir_entries = NULL;
		int dir_entries_nb;
		int dir_entries_it;

		if (stat(wl->s, &file_stat)) {
			ha_alert("Cannot open configuration file/directory %s : %s\n",
				 wl->s,
				 strerror(errno));
			exit(1);
		}

		if (!S_ISDIR(file_stat.st_mode))
			continue;

		/* from this point wl->s is a directory */

		dir_entries_nb = scandir(wl->s, &dir_entries, NULL, alphasort);
		if (dir_entries_nb < 0) {
			ha_alert("Cannot open configuration directory %s : %s\n",
				 wl->s,
				 strerror(errno));
			exit(1);
		}

		/* for each element in the directory wl->s */
		for (dir_entries_it = 0; dir_entries_it < dir_entries_nb; dir_entries_it++) {
			struct dirent *dir_entry = dir_entries[dir_entries_it];
			char *filename = NULL;
			char *d_name_cfgext = strstr(dir_entry->d_name, ".cfg");

			/* don't add filename that begin with .
			 * only add filename with .cfg extension
			 */
			if (dir_entry->d_name[0] == '.' ||
			    !(d_name_cfgext && d_name_cfgext[4] == '\0'))
				goto next_dir_entry;

			if (!memprintf(&filename, "%s/%s", wl->s, dir_entry->d_name)) {
				ha_alert("Cannot load configuration files %s : out of memory.\n",
					 filename);
				exit(1);
			}

			if (stat(filename, &file_stat)) {
				ha_alert("Cannot open configuration file %s : %s\n",
					 wl->s,
					 strerror(errno));
				exit(1);
			}

			/* don't add anything else than regular file in cfg_cfgfiles
			 * this way we avoid loops
			 */
			if (!S_ISREG(file_stat.st_mode))
				goto next_dir_entry;

			if (!list_append_word(&wl->list, filename, &err)) {
				ha_alert("Cannot load configuration files %s : %s\n",
					 filename,
					 err);
				exit(1);
			}

next_dir_entry:
			free(filename);
			free(dir_entry);
		}

		free(dir_entries);

		/* remove the current directory (wl) from cfg_cfgfiles */
		free(wl->s);
		LIST_DELETE(&wl->list);
		free(wl);
	}

	free(err);
}

/*
 * copy and cleanup the current argv
 * Remove the -sf /-st / -x parameters
 * Return an allocated copy of argv
 */

static char **copy_argv(int argc, char **argv)
{
	char **newargv, **retargv;

	newargv = calloc(argc + 2, sizeof(*newargv));
	if (newargv == NULL) {
		ha_warning("Cannot allocate memory\n");
		return NULL;
	}
	retargv = newargv;

	/* first copy argv[0] */
	*newargv++ = *argv++;
	argc--;

	while (argc > 0) {
		if (**argv != '-') {
			/* non options are copied but will fail in the argument parser */
			*newargv++ = *argv++;
			argc--;

		} else  {
			char *flag;

			flag = *argv + 1;

			if (flag[0] == '-' && flag[1] == 0) {
				/* "--\0" copy every arguments till the end of argv */
				*newargv++ = *argv++;
				argc--;

				while (argc > 0) {
					*newargv++ = *argv++;
					argc--;
				}
			} else {
				switch (*flag) {
					case 's':
						/* -sf / -st and their parameters are ignored */
						if (flag[1] == 'f' || flag[1] == 't') {
							argc--;
							argv++;
							/* The list can't contain a negative value since the only
							way to know the end of this list is by looking for the
							next option or the end of the options */
							while (argc > 0 && argv[0][0] != '-') {
								argc--;
								argv++;
							}
						} else {
							argc--;
							argv++;

						}
						break;

					case 'x':
						/* this option and its parameter are ignored */
						argc--;
						argv++;
						if (argc > 0) {
							argc--;
							argv++;
						}
						break;

					case 'C':
					case 'n':
					case 'm':
					case 'N':
					case 'L':
					case 'f':
					case 'p':
					case 'S':
						/* these options have only 1 parameter which must be copied and can start with a '-' */
						*newargv++ = *argv++;
						argc--;
						if (argc == 0)
							goto error;
						*newargv++ = *argv++;
						argc--;
						break;
					default:
						/* for other options just copy them without parameters, this is also done
						 * for options like "--foo", but this  will fail in the argument parser.
						 * */
						*newargv++ = *argv++;
						argc--;
						break;
				}
			}
		}
	}

	return retargv;

error:
	free(retargv);
	return NULL;
}


/* Performs basic random seed initialization. The main issue with this is that
 * srandom_r() only takes 32 bits and purposely provides a reproducible sequence,
 * which means that there will only be 4 billion possible random sequences once
 * srandom() is called, regardless of the internal state. Not calling it is
 * even worse as we'll always produce the same randoms sequences. What we do
 * here is to create an initial sequence from various entropy sources, hash it
 * using SHA1 and keep the resulting 160 bits available globally.
 *
 * We initialize the current process with the first 32 bits before starting the
 * polling loop, where all this will be changed to have process specific and
 * thread specific sequences.
 *
 * Before starting threads, it's still possible to call random() as srandom()
 * is initialized from this, but after threads and/or processes are started,
 * only ha_random() is expected to be used to guarantee distinct sequences.
 */
static void ha_random_boot(char *const *argv)
{
	unsigned char message[256];
	unsigned char *m = message;
	struct timeval tv;
	blk_SHA_CTX ctx;
	unsigned long l;
	int fd;
	int i;

	/* start with current time as pseudo-random seed */
	gettimeofday(&tv, NULL);
	write_u32(m, tv.tv_sec);  m += 4;
	write_u32(m, tv.tv_usec); m += 4;

	/* PID and PPID add some OS-based randomness */
	write_u16(m, getpid());   m += 2;
	write_u16(m, getppid());  m += 2;

	/* take up to 160 bits bytes from /dev/urandom if available (non-blocking) */
	fd = open("/dev/urandom", O_RDONLY);
	if (fd >= 0) {
		i = read(fd, m, 20);
		if (i > 0)
			m += i;
		close(fd);
	}

	/* take up to 160 bits bytes from openssl (non-blocking) */
#ifdef USE_OPENSSL
	if (RAND_bytes(m, 20) == 1)
		m += 20;
#endif

	/* take 160 bits from existing random in case it was already initialized */
	for (i = 0; i < 5; i++) {
		write_u32(m, random());
		m += 4;
	}

	/* stack address (benefit form operating system's ASLR) */
	l = (unsigned long)&m;
	memcpy(m, &l, sizeof(l)); m += sizeof(l);

	/* argv address (benefit form operating system's ASLR) */
	l = (unsigned long)&argv;
	memcpy(m, &l, sizeof(l)); m += sizeof(l);

	/* use tv_usec again after all the operations above */
	gettimeofday(&tv, NULL);
	write_u32(m, tv.tv_usec); m += 4;

	/*
	 * At this point, ~84-92 bytes have been used
	 */

	/* finish with the hostname */
	strncpy((char *)m, hostname, message + sizeof(message) - m);
	m += strlen(hostname);

	/* total message length */
	l = m - message;

	memset(&ctx, 0, sizeof(ctx));
	blk_SHA1_Init(&ctx);
	blk_SHA1_Update(&ctx, message, l);
	blk_SHA1_Final(boot_seed, &ctx);

	srandom(read_u32(boot_seed));
	ha_random_seed(boot_seed, sizeof(boot_seed));
}

/* considers splicing proxies' maxconn, computes the ideal global.maxpipes
 * setting, and returns it. It may return -1 meaning "unlimited" if some
 * unlimited proxies have been found and the global.maxconn value is not yet
 * set. It may also return a value greater than maxconn if it's not yet set.
 * Note that a value of zero means there is no need for pipes. -1 is never
 * returned if global.maxconn is valid.
 */
static int compute_ideal_maxpipes()
{
	struct proxy *cur;
	int nbfe = 0, nbbe = 0;
	int unlimited = 0;
	int pipes;
	int max;

	for (cur = proxies_list; cur; cur = cur->next) {
		if (cur->options2 & (PR_O2_SPLIC_ANY)) {
			if (cur->cap & PR_CAP_FE) {
				max = cur->maxconn;
				nbfe += max;
				if (!max) {
					unlimited = 1;
					break;
				}
			}
			if (cur->cap & PR_CAP_BE) {
				max = cur->fullconn ? cur->fullconn : global.maxconn;
				nbbe += max;
				if (!max) {
					unlimited = 1;
					break;
				}
			}
		}
	}

	pipes = MAX(nbfe, nbbe);
	if (global.maxconn) {
		if (pipes > global.maxconn || unlimited)
			pipes = global.maxconn;
	} else if (unlimited) {
		pipes = -1;
	}

	return pipes >= 4 ? pipes / 4 : pipes;
}

/* considers global.maxsocks, global.maxpipes, async engines, SSL frontends and
 * rlimits and computes an ideal maxconn. It's meant to be called only when
 * maxsock contains the sum of listening FDs, before it is updated based on
 * maxconn and pipes. If there are not enough FDs left, DEFAULT_MAXCONN (by
 * default 100) is returned as it is expected that it will even run on tight
 * environments, and will maintain compatibility with previous packages that
 * used to rely on this value as the default one. The system will emit a
 * warning indicating how many FDs are missing anyway if needed.
 */
static int compute_ideal_maxconn()
{
	int ssl_sides = !!global.ssl_used_frontend + !!global.ssl_used_backend;
	int engine_fds = global.ssl_used_async_engines * ssl_sides;
	int pipes = compute_ideal_maxpipes();
	int remain = MAX(rlim_fd_cur_at_boot, rlim_fd_max_at_boot);
	int maxconn;

	/* we have to take into account these elements :
	 *   - number of engine_fds, which inflates the number of FD needed per
	 *     connection by this number.
	 *   - number of pipes per connection on average : for the unlimited
	 *     case, this is 0.5 pipe FDs per connection, otherwise it's a
	 *     fixed value of 2*pipes.
	 *   - two FDs per connection
	 */

	/* subtract listeners and checks */
	remain -= global.maxsock;

	/* one epoll_fd/kqueue_fd per thread */
	remain -= global.nbthread;

	/* one wake-up pipe (2 fd) per thread */
	remain -= 2 * global.nbthread;

	/* Fixed pipes values : we only subtract them if they're not larger
	 * than the remaining FDs because pipes are optional.
	 */
	if (pipes >= 0 && pipes * 2 < remain)
		remain -= pipes * 2;

	if (pipes < 0) {
		/* maxsock = maxconn * 2 + maxconn/4 * 2 + maxconn * engine_fds.
		 *         = maxconn * (2 + 0.5 + engine_fds)
		 *         = maxconn * (4 + 1 + 2*engine_fds) / 2
		 */
		maxconn = 2 * remain / (5 + 2 * engine_fds);
	} else {
		/* maxsock = maxconn * 2 + maxconn * engine_fds.
		 *         = maxconn * (2 + engine_fds)
		 */
		maxconn = remain / (2 + engine_fds);
	}

	return MAX(maxconn, DEFAULT_MAXCONN);
}

/* computes the estimated maxsock value for the given maxconn based on the
 * possibly set global.maxpipes and existing partial global.maxsock. It may
 * temporarily change global.maxconn for the time needed to propagate the
 * computations, and will reset it.
 */
static int compute_ideal_maxsock(int maxconn)
{
	int maxpipes = global.maxpipes;
	int maxsock  = global.maxsock;


	if (!maxpipes) {
		int old_maxconn = global.maxconn;

		global.maxconn = maxconn;
		maxpipes = compute_ideal_maxpipes();
		global.maxconn = old_maxconn;
	}

	maxsock += maxconn * 2;         /* each connection needs two sockets */
	maxsock += maxpipes * 2;        /* each pipe needs two FDs */
	maxsock += global.nbthread;     /* one epoll_fd/kqueue_fd per thread */
	maxsock += 2 * global.nbthread; /* one wake-up pipe (2 fd) per thread */

	/* compute fd used by async engines */
	if (global.ssl_used_async_engines) {
		int sides = !!global.ssl_used_frontend + !!global.ssl_used_backend;

		maxsock += maxconn * sides * global.ssl_used_async_engines;
	}
	return maxsock;
}

/* Tests if it is possible to set the current process's RLIMIT_NOFILE to
 * <maxsock>, then sets it back to the previous value. Returns non-zero if the
 * value is accepted, non-zero otherwise. This is used to determine if an
 * automatic limit may be applied or not. When it is not, the caller knows that
 * the highest we can do is the rlim_max at boot. In case of error, we return
 * that the setting is possible, so that we defer the error processing to the
 * final stage in charge of enforcing this.
 */
static int check_if_maxsock_permitted(int maxsock)
{
	struct rlimit orig_limit, test_limit;
	int ret;

	if (getrlimit(RLIMIT_NOFILE, &orig_limit) != 0)
		return 1;

	/* don't go further if we can't even set to what we have */
	if (setrlimit(RLIMIT_NOFILE, &orig_limit) != 0)
		return 1;

	test_limit.rlim_max = MAX(maxsock, orig_limit.rlim_max);
	test_limit.rlim_cur = test_limit.rlim_max;
	ret = setrlimit(RLIMIT_NOFILE, &test_limit);

	if (setrlimit(RLIMIT_NOFILE, &orig_limit) != 0)
		return 1;

	return ret == 0;
}

/* This performs th every basic early initialization at the end of the PREPARE
 * init stage. It may only assume that list heads are initialized, but not that
 * anything else is correct. It will initialize a number of variables that
 * depend on command line and will pre-parse the command line. If it fails, it
 * directly exits.
 */
static void init_early(int argc, char **argv)
{
	char *progname;
	char *tmp;
	int len;

	/* First, let's initialize most global variables */
	totalconn = actconn = listeners = stopping = 0;
	killed = pid = 0;

	global.maxsock = 10; /* reserve 10 fds ; will be incremented by socket eaters */
	global.rlimit_memmax_all = HAPROXY_MEMMAX;
	global.mode = MODE_STARTING;

	/* if we were in mworker mode, we should restart in mworker mode */
	if (getenv("HAPROXY_MWORKER_REEXEC") != NULL)
		global.mode |= MODE_MWORKER;

	/* initialize date, time, and pid */
	tzset();
	clock_init_process_date();
	start_date = now;
	pid = getpid();

	/* Set local host name and adjust some environment variables.
	 * NB: POSIX does not make it mandatory for gethostname() to
	 * NULL-terminate the string in case of truncation, and at least
	 * FreeBSD appears not to do it.
	 */
	memset(hostname, 0, sizeof(hostname));
	gethostname(hostname, sizeof(hostname) - 1);

	/* preset some environment variables */
	localpeer = strdup(hostname);
	if (!localpeer || setenv("HAPROXY_LOCALPEER", localpeer, 1) < 0) {
		ha_alert("Cannot allocate memory for local peer.\n");
		exit(EXIT_FAILURE);
	}

	/* Initialize the random generators */
#ifdef USE_OPENSSL
	/* Initialize SSL random generator. Must be called before chroot for
	 * access to /dev/urandom, and before ha_random_boot() which may use
	 * RAND_bytes().
	 */
	if (!ssl_initialize_random()) {
		ha_alert("OpenSSL random data generator initialization failed.\n");
		exit(EXIT_FAILURE);
	}
#endif
	ha_random_boot(argv); // the argv pointer brings some kernel-fed entropy

	/* Some CPU affinity stuff may have to be initialized */
#ifdef USE_CPU_AFFINITY
	{
		int i;
		ha_cpuset_zero(&cpu_map.proc);
		ha_cpuset_zero(&cpu_map.proc_t1);
		for (i = 0; i < MAX_THREADS; ++i) {
			ha_cpuset_zero(&cpu_map.thread[i]);
		}
	}
#endif

	/* extract the program name from argv[0], it will be used for the logs
	 * and error messages.
	 */
	progname = *argv;
	while ((tmp = strchr(progname, '/')) != NULL)
		progname = tmp + 1;

	len = strlen(progname);
	progname = strdup(progname);
	if (!progname) {
		ha_alert("Cannot allocate memory for log_tag.\n");
		exit(EXIT_FAILURE);
	}

	chunk_initlen(&global.log_tag, progname, len, len);
}

/* handles program arguments. Very minimal parsing is performed, variables are
 * fed with some values, and lists are completed with other ones. In case of
 * error, it will exit.
 */
static void init_args(int argc, char **argv)
{
	char *progname = global.log_tag.area;
	char *err_msg = NULL;

	/* pre-fill in the global tuning options before we let the cmdline
	 * change them.
	 */
	global.tune.options |= GTUNE_USE_SELECT;  /* select() is always available */
#if defined(USE_POLL)
	global.tune.options |= GTUNE_USE_POLL;
#endif
#if defined(USE_EPOLL)
	global.tune.options |= GTUNE_USE_EPOLL;
#endif
#if defined(USE_KQUEUE)
	global.tune.options |= GTUNE_USE_KQUEUE;
#endif
#if defined(USE_EVPORTS)
	global.tune.options |= GTUNE_USE_EVPORTS;
#endif
#if defined(USE_LINUX_SPLICE)
	global.tune.options |= GTUNE_USE_SPLICE;
#endif
#if defined(USE_GETADDRINFO)
	global.tune.options |= GTUNE_USE_GAI;
#endif
#if defined(SO_REUSEPORT)
	global.tune.options |= GTUNE_USE_REUSEPORT;
#endif
#ifdef USE_THREAD
	global.tune.options |= GTUNE_IDLE_POOL_SHARED;
#endif
	global.tune.options |= GTUNE_STRICT_LIMITS;

	/* keep a copy of original arguments for the master process */
	old_argv = copy_argv(argc, argv);
	if (!old_argv) {
		ha_alert("failed to copy argv.\n");
		exit(EXIT_FAILURE);
	}

	/* skip program name and start */
	argc--; argv++;
	while (argc > 0) {
		char *flag;

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

			/* 1 arg */
			if (*flag == 'v') {
				display_version();
				if (flag[1] == 'v')  /* -vv */
					display_build_opts();
				exit(0);
			}
#if defined(USE_EPOLL)
			else if (*flag == 'd' && flag[1] == 'e')
				global.tune.options &= ~GTUNE_USE_EPOLL;
#endif
#if defined(USE_POLL)
			else if (*flag == 'd' && flag[1] == 'p')
				global.tune.options &= ~GTUNE_USE_POLL;
#endif
#if defined(USE_KQUEUE)
			else if (*flag == 'd' && flag[1] == 'k')
				global.tune.options &= ~GTUNE_USE_KQUEUE;
#endif
#if defined(USE_EVPORTS)
			else if (*flag == 'd' && flag[1] == 'v')
				global.tune.options &= ~GTUNE_USE_EVPORTS;
#endif
#if defined(USE_LINUX_SPLICE)
			else if (*flag == 'd' && flag[1] == 'S')
				global.tune.options &= ~GTUNE_USE_SPLICE;
#endif
#if defined(USE_GETADDRINFO)
			else if (*flag == 'd' && flag[1] == 'G')
				global.tune.options &= ~GTUNE_USE_GAI;
#endif
#if defined(SO_REUSEPORT)
			else if (*flag == 'd' && flag[1] == 'R')
				global.tune.options &= ~GTUNE_USE_REUSEPORT;
#endif
			else if (*flag == 'd' && flag[1] == 'V')
				global.ssl_server_verify = SSL_SERVER_VERIFY_NONE;
			else if (*flag == 'V')
				arg_mode |= MODE_VERBOSE;
			else if (*flag == 'd' && flag[1] == 'b')
				arg_mode |= MODE_FOREGROUND;
			else if (*flag == 'd' && flag[1] == 'D')
				arg_mode |= MODE_DIAG;
			else if (*flag == 'd' && flag[1] == 'W')
				arg_mode |= MODE_ZERO_WARNING;
			else if (*flag == 'd' && flag[1] == 'M') {
				int ret = pool_parse_debugging(flag + 2, &err_msg);

				if (ret <= -1) {
					if (ret < -1)
						ha_alert("-dM: %s\n", err_msg);
					else
						printf("%s\n", err_msg);
					ha_free(&err_msg);
					exit(ret < -1 ? EXIT_FAILURE : 0);
				} else if (ret == 0) {
					ha_warning("-dM: %s\n", err_msg);
					ha_free(&err_msg);
				}
			}
			else if (*flag == 'd' && flag[1] == 'r')
				global.tune.options |= GTUNE_RESOLVE_DONTFAIL;
#if defined(HA_HAVE_DUMP_LIBS)
			else if (*flag == 'd' && flag[1] == 'L')
				arg_mode |= MODE_DUMP_LIBS;
#endif
			else if (*flag == 'd' && flag[1] == 'K') {
				arg_mode |= MODE_DUMP_KWD;
				kwd_dump = flag + 2;
			}
			else if (*flag == 'd')
				arg_mode |= MODE_DEBUG;
			else if (*flag == 'c' && flag[1] == 'c') {
				arg_mode |= MODE_CHECK_CONDITION;
				argv++;
				argc--;
				check_condition = *argv;
			}
			else if (*flag == 'c')
				arg_mode |= MODE_CHECK;
			else if (*flag == 'D')
				arg_mode |= MODE_DAEMON;
			else if (*flag == 'W' && flag[1] == 's') {
				arg_mode |= MODE_MWORKER | MODE_FOREGROUND;
#if defined(USE_SYSTEMD)
				global.tune.options |= GTUNE_USE_SYSTEMD;
#else
				ha_alert("master-worker mode with systemd support (-Ws) requested, but not compiled. Use master-worker mode (-W) if you are not using Type=notify in your unit file or recompile with USE_SYSTEMD=1.\n\n");
				usage(progname);
#endif
			}
			else if (*flag == 'W')
				arg_mode |= MODE_MWORKER;
			else if (*flag == 'q')
				arg_mode |= MODE_QUIET;
			else if (*flag == 'x') {
				if (argc <= 1) {
					ha_alert("Unix socket path expected with the -x flag\n\n");
					usage(progname);
				}
				if (old_unixsocket)
					ha_warning("-x option already set, overwriting the value\n");
				old_unixsocket = argv[1];

				argv++;
				argc--;
			}
			else if (*flag == 'S') {
				struct wordlist *c;

				if (argc <= 1) {
					ha_alert("Socket and optional bind parameters expected with the -S flag\n");
					usage(progname);
				}
				if ((c = malloc(sizeof(*c))) == NULL || (c->s = strdup(argv[1])) == NULL) {
					ha_alert("Cannot allocate memory\n");
					exit(EXIT_FAILURE);
				}
				LIST_INSERT(&mworker_cli_conf, &c->list);

				argv++;
				argc--;
			}
			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 */
				while (argc > 1 && argv[1][0] != '-') {
					char * endptr = NULL;
					oldpids = realloc(oldpids, (nb_oldpids + 1) * sizeof(int));
					if (!oldpids) {
						ha_alert("Cannot allocate old pid : out of memory.\n");
						exit(1);
					}
					argc--; argv++;
					errno = 0;
					oldpids[nb_oldpids] = strtol(*argv, &endptr, 10);
					if (errno) {
						ha_alert("-%2s option: failed to parse {%s}: %s\n",
							 flag,
							 *argv, strerror(errno));
						exit(1);
					} else if (endptr && strlen(endptr)) {
						while (isspace((unsigned char)*endptr)) endptr++;
						if (*endptr != 0) {
							ha_alert("-%2s option: some bytes unconsumed in PID list {%s}\n",
								 flag, endptr);
							exit(1);
						}
					}
					if (oldpids[nb_oldpids] <= 0)
						usage(progname);
					nb_oldpids++;
				}
			}
			else if (flag[0] == '-' && flag[1] == 0) { /* "--" */
				/* now that's a cfgfile list */
				argv++; argc--;
				while (argc > 0) {
					if (!list_append_word(&cfg_cfgfiles, *argv, &err_msg)) {
						ha_alert("Cannot load configuration file/directory %s : %s\n",
							 *argv,
							 err_msg);
						exit(1);
					}
					argv++; argc--;
				}
				break;
			}
			else { /* >=2 args */
				argv++; argc--;
				if (argc == 0)
					usage(progname);

				switch (*flag) {
				case 'C' : change_dir = *argv; break;
				case 'n' : cfg_maxconn = atol(*argv); break;
				case 'm' : global.rlimit_memmax_all = atol(*argv); break;
				case 'N' : cfg_maxpconn = atol(*argv); break;
				case 'L' :
					free(localpeer);
					if ((localpeer = strdup(*argv)) == NULL) {
						ha_alert("Cannot allocate memory for local peer.\n");
						exit(EXIT_FAILURE);
					}
					setenv("HAPROXY_LOCALPEER", localpeer, 1);
					global.localpeer_cmdline = 1;
					break;
				case 'f' :
					if (!list_append_word(&cfg_cfgfiles, *argv, &err_msg)) {
						ha_alert("Cannot load configuration file/directory %s : %s\n",
							 *argv,
							 err_msg);
						exit(1);
					}
					break;
				case 'p' :
					free(global.pidfile);
					if ((global.pidfile = strdup(*argv)) == NULL) {
						ha_alert("Cannot allocate memory for pidfile.\n");
						exit(EXIT_FAILURE);
					}
					break;
				default: usage(progname);
				}
			}
		}
		else
			usage(progname);
		argv++; argc--;
	}
	free(err_msg);
}

/* call the various keyword dump functions based on the comma-delimited list of
 * classes in kwd_dump.
 */
static void dump_registered_keywords(void)
{
	char *end;
	int all __maybe_unused = 0;

	for (; kwd_dump && *kwd_dump; kwd_dump = end) {
		end = strchr(kwd_dump, ',');
		if (end)
			*(end++) = 0;

		if (strcmp(kwd_dump, "help") == 0) {
			printf("# List of supported keyword classes:\n");
			printf("all: list all keywords\n");
			printf("acl: ACL keywords\n");
			printf("cfg: configuration keywords\n");
			printf("cli: CLI keywords\n");
			printf("cnv: sample converter keywords\n");
			printf("flt: filter names\n");
			printf("smp: sample fetch functions\n");
			printf("svc: service names\n");
			continue;
		}
		else if (strcmp(kwd_dump, "all") == 0) {
			all = 1;
		}

		if (all || strcmp(kwd_dump, "acl") == 0) {
			printf("# List of registered ACL keywords:\n");
			acl_dump_kwd();
		}

		if (all || strcmp(kwd_dump, "cfg") == 0) {
			printf("# List of registered configuration keywords:\n");
			cfg_dump_registered_keywords();
		}

		if (all || strcmp(kwd_dump, "cli") == 0) {
			printf("# List of registered CLI keywords:\n");
			cli_list_keywords();
		}

		if (all || strcmp(kwd_dump, "cnv") == 0) {
			printf("# List of registered sample converter functions:\n");
			smp_dump_conv_kw();
		}

		if (all || strcmp(kwd_dump, "flt") == 0) {
			printf("# List of registered filter names:\n");
			flt_dump_kws(NULL);
		}

		if (all || strcmp(kwd_dump, "smp") == 0) {
			printf("# List of registered sample fetch functions:\n");
			smp_dump_fetch_kw();
		}

		if (all || strcmp(kwd_dump, "svc") == 0) {
			printf("# List of registered service names:\n");
			list_services(NULL);
		}
	}
}

/*
 * This function initializes all the necessary variables. It only returns
 * if everything is OK. If something fails, it exits.
 */
static void init(int argc, char **argv)
{
	char *progname = global.log_tag.area;
	int err_code = 0;
	struct wordlist *wl;
	struct proxy *px;
	struct post_check_fct *pcf;
	int ideal_maxconn;

	if (!init_trash_buffers(1)) {
		ha_alert("failed to initialize trash buffers.\n");
		exit(1);
	}

	if (init_acl() != 0)
		exit(1);

	/* Initialise lua. */
	hlua_init();

	global.mode |= (arg_mode & (MODE_DAEMON | MODE_MWORKER | MODE_FOREGROUND | MODE_VERBOSE
				    | MODE_QUIET | MODE_CHECK | MODE_DEBUG | MODE_ZERO_WARNING
				    | MODE_DIAG | MODE_CHECK_CONDITION | MODE_DUMP_LIBS | MODE_DUMP_KWD));

	if (getenv("HAPROXY_MWORKER_WAIT_ONLY")) {
		unsetenv("HAPROXY_MWORKER_WAIT_ONLY");
		global.mode |= MODE_MWORKER_WAIT;
		global.mode &= ~MODE_MWORKER;
	}

	if ((global.mode & (MODE_MWORKER | MODE_CHECK | MODE_CHECK_CONDITION)) == MODE_MWORKER &&
	    (getenv("HAPROXY_MWORKER_REEXEC") != NULL)) {
		atexit_flag = 1;
		atexit(reexec_on_failure);
	}

	if (change_dir && chdir(change_dir) < 0) {
		ha_alert("Could not change to directory %s : %s\n", change_dir, strerror(errno));
		exit(1);
	}

	usermsgs_clr("config");

	if (global.mode & MODE_CHECK_CONDITION) {
		int result;

		uint32_t err;
		const char *errptr;
		char *errmsg = NULL;

		char *args[MAX_LINE_ARGS+1];
		int arg = sizeof(args) / sizeof(*args);
		size_t outlen = strlen(check_condition) + 1;
		char *w;

		err = parse_line(check_condition, check_condition, &outlen, args, &arg,
		                 PARSE_OPT_ENV | PARSE_OPT_WORD_EXPAND | PARSE_OPT_DQUOTE | PARSE_OPT_SQUOTE | PARSE_OPT_BKSLASH,
		                 &errptr);

		if (err & PARSE_ERR_QUOTE) {
			ha_alert("Syntax Error in condition: Unmatched quote.\n");
			exit(2);
		}

		if (err & PARSE_ERR_HEX) {
			ha_alert("Syntax Error in condition: Truncated or invalid hexadecimal sequence.\n");
			exit(2);
		}

		if (err & (PARSE_ERR_TOOLARGE|PARSE_ERR_OVERLAP)) {
			ha_alert("Error in condition: Line too long.\n");
			exit(2);
		}

		if (err & PARSE_ERR_TOOMANY) {
			ha_alert("Error in condition: Too many words.\n");
			exit(2);
		}

		if (err) {
			ha_alert("Unhandled error in condition, please report this to the developers.\n");
			exit(2);
		}

		/* remerge all words into a single expression */
		for (w = *args; (w += strlen(w)) < check_condition + outlen - 1; *w = ' ')
			;

		result = cfg_eval_condition(args, &errmsg, &errptr);

		if (result < 0) {
			if (errmsg)
				ha_alert("Failed to evaluate condition: %s\n", errmsg);

			exit(2);
		}

		exit(result ? 0 : 1);
	}

	/* in wait mode, we don't try to read the configuration files */
	if (!(global.mode & MODE_MWORKER_WAIT)) {
		char *env_cfgfiles = NULL;
		int env_err = 0;

		/* handle cfgfiles that are actually directories */
		cfgfiles_expand_directories();

		if (LIST_ISEMPTY(&cfg_cfgfiles))
			usage(progname);


		list_for_each_entry(wl, &cfg_cfgfiles, list) {
			int ret;

			if (env_err == 0) {
				if (!memprintf(&env_cfgfiles, "%s%s%s",
					       (env_cfgfiles ? env_cfgfiles : ""),
					       (env_cfgfiles ? ";" : ""), wl->s))
					env_err = 1;
			}

			ret = readcfgfile(wl->s);
			if (ret == -1) {
				ha_alert("Could not open configuration file %s : %s\n",
					 wl->s, strerror(errno));
				free(env_cfgfiles);
				exit(1);
			}
			if (ret & (ERR_ABORT|ERR_FATAL))
				ha_alert("Error(s) found in configuration file : %s\n", wl->s);
			err_code |= ret;
			if (err_code & ERR_ABORT) {
				free(env_cfgfiles);
				exit(1);
			}
		}

		/* do not try to resolve arguments nor to spot inconsistencies when
		 * the configuration contains fatal errors caused by files not found
		 * or failed memory allocations.
		 */
		if (err_code & (ERR_ABORT|ERR_FATAL)) {
			ha_alert("Fatal errors found in configuration.\n");
			free(env_cfgfiles);
			exit(1);
		}
		if (env_err) {
			ha_alert("Could not allocate memory for HAPROXY_CFGFILES env variable\n");
			exit(1);
		}
		setenv("HAPROXY_CFGFILES", env_cfgfiles, 1);
		free(env_cfgfiles);

	}
	if (global.mode & MODE_MWORKER) {
		struct mworker_proc *tmproc;

		setenv("HAPROXY_MWORKER", "1", 1);

		if (getenv("HAPROXY_MWORKER_REEXEC") == NULL) {

			tmproc = mworker_proc_new();
			if (!tmproc) {
				ha_alert("Cannot allocate process structures.\n");
				exit(EXIT_FAILURE);
			}
			tmproc->options |= PROC_O_TYPE_MASTER; /* master */
			tmproc->pid = pid;
			tmproc->timestamp = start_date.tv_sec;
			proc_self = tmproc;

			LIST_APPEND(&proc_list, &tmproc->list);
		}

		tmproc = mworker_proc_new();
		if (!tmproc) {
			ha_alert("Cannot allocate process structures.\n");
			exit(EXIT_FAILURE);
		}
		tmproc->options |= PROC_O_TYPE_WORKER; /* worker */

		if (mworker_cli_sockpair_new(tmproc, 0) < 0) {
			exit(EXIT_FAILURE);
		}

		LIST_APPEND(&proc_list, &tmproc->list);
	}
	if (global.mode & (MODE_MWORKER|MODE_MWORKER_WAIT)) {
		struct wordlist *it, *c;

		/* get the info of the children in the env */
		if (mworker_env_to_proc_list() < 0) {
			exit(EXIT_FAILURE);
		}

		if (!LIST_ISEMPTY(&mworker_cli_conf)) {

			if (mworker_cli_proxy_create() < 0) {
				ha_alert("Can't create the master's CLI.\n");
				exit(EXIT_FAILURE);
			}

			list_for_each_entry_safe(c, it, &mworker_cli_conf, list) {

				if (mworker_cli_proxy_new_listener(c->s) < 0) {
					ha_alert("Can't create the master's CLI.\n");
					exit(EXIT_FAILURE);
				}
				LIST_DELETE(&c->list);
				free(c->s);
				free(c);
			}
		}
	}

	if (!LIST_ISEMPTY(&mworker_cli_conf) && !(arg_mode & MODE_MWORKER)) {
		ha_warning("a master CLI socket was defined, but master-worker mode (-W) is not enabled.\n");
	}

	/* destroy unreferenced defaults proxies  */
	proxy_destroy_all_unref_defaults();


	err_code |= check_config_validity();
	for (px = proxies_list; px; px = px->next) {
		struct server *srv;
		struct post_proxy_check_fct *ppcf;
		struct post_server_check_fct *pscf;

		if (px->flags & (PR_FL_DISABLED|PR_FL_STOPPED))
			continue;

		list_for_each_entry(pscf, &post_server_check_list, list) {
			for (srv = px->srv; srv; srv = srv->next)
				err_code |= pscf->fct(srv);
		}
		list_for_each_entry(ppcf, &post_proxy_check_list, list)
			err_code |= ppcf->fct(px);
	}
	if (err_code & (ERR_ABORT|ERR_FATAL)) {
		ha_alert("Fatal errors found in configuration.\n");
		exit(1);
	}

	err_code |= pattern_finalize_config();
	if (err_code & (ERR_ABORT|ERR_FATAL)) {
		ha_alert("Failed to finalize pattern config.\n");
		exit(1);
	}

	if (global.rlimit_memmax_all)
		global.rlimit_memmax = global.rlimit_memmax_all;

#ifdef USE_NS
        err_code |= netns_init();
        if (err_code & (ERR_ABORT|ERR_FATAL)) {
                ha_alert("Failed to initialize namespace support.\n");
                exit(1);
        }
#endif

	/* Apply server states */
	apply_server_state();

	for (px = proxies_list; px; px = px->next)
		srv_compute_all_admin_states(px);

	/* Apply servers' configured address */
	err_code |= srv_init_addr();
	if (err_code & (ERR_ABORT|ERR_FATAL)) {
		ha_alert("Failed to initialize server(s) addr.\n");
		exit(1);
	}

	if (warned & WARN_ANY && global.mode & MODE_ZERO_WARNING) {
		ha_alert("Some warnings were found and 'zero-warning' is set. Aborting.\n");
		exit(1);
	}

#if defined(HA_HAVE_DUMP_LIBS)
	if (global.mode & MODE_DUMP_LIBS) {
		qfprintf(stdout, "List of loaded object files:\n");
		chunk_reset(&trash);
		if (dump_libs(&trash, 0))
			printf("%s", trash.area);
	}
#endif

	if (global.mode & MODE_DUMP_KWD)
		dump_registered_keywords();

	if (global.mode & MODE_CHECK) {
		struct peers *pr;
		struct proxy *px;

		if (warned & WARN_ANY)
			qfprintf(stdout, "Warnings were found.\n");

		for (pr = cfg_peers; pr; pr = pr->next)
			if (pr->peers_fe)
				break;

		for (px = proxies_list; px; px = px->next)
			if (!(px->flags & (PR_FL_DISABLED|PR_FL_STOPPED)) && px->li_all)
				break;

		if (!px) {
			/* We may only have log-forward section */
			for (px = cfg_log_forward; px; px = px->next)
				if (!(px->flags & (PR_FL_DISABLED|PR_FL_STOPPED)) && px->li_all)
					break;
		}

		if (pr || px) {
			/* At least one peer or one listener has been found */
			qfprintf(stdout, "Configuration file is valid\n");
			deinit_and_exit(0);
		}
		qfprintf(stdout, "Configuration file has no error but will not start (no listener) => exit(2).\n");
		exit(2);
	}

	if (global.mode & MODE_DIAG) {
		cfg_run_diagnostics();
	}

	/* now we know the buffer size, we can initialize the channels and buffers */
	init_buffer();

	list_for_each_entry(pcf, &post_check_list, list) {
		err_code |= pcf->fct();
		if (err_code & (ERR_ABORT|ERR_FATAL))
			exit(1);
	}

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

	if (global.cli_fe)
		global.maxsock += global.cli_fe->maxconn;

	if (cfg_peers) {
		/* peers also need to bypass global maxconn */
		struct peers *p = cfg_peers;

		for (p = cfg_peers; p; p = p->next)
			if (p->peers_fe)
				global.maxsock += p->peers_fe->maxconn;
	}

	/* Now we want to compute the maxconn and possibly maxsslconn values.
	 * It's a bit tricky. Maxconn defaults to the pre-computed value based
	 * on rlim_fd_cur and the number of FDs in use due to the configuration,
	 * and maxsslconn defaults to DEFAULT_MAXSSLCONN. On top of that we can
	 * enforce a lower limit based on memmax.
	 *
	 * If memmax is set, then it depends on which values are set. If
	 * maxsslconn is set, we use memmax to determine how many cleartext
	 * connections may be added, and set maxconn to the sum of the two.
	 * If maxconn is set and not maxsslconn, maxsslconn is computed from
	 * the remaining amount of memory between memmax and the cleartext
	 * connections. If neither are set, then it is considered that all
	 * connections are SSL-capable, and maxconn is computed based on this,
	 * then maxsslconn accordingly. We need to know if SSL is used on the
	 * frontends, backends, or both, because when it's used on both sides,
	 * we need twice the value for maxsslconn, but we only count the
	 * handshake once since it is not performed on the two sides at the
	 * same time (frontend-side is terminated before backend-side begins).
	 * The SSL stack is supposed to have filled ssl_session_cost and
	 * ssl_handshake_cost during its initialization. In any case, if
	 * SYSTEM_MAXCONN is set, we still enforce it as an upper limit for
	 * maxconn in order to protect the system.
	 */
	ideal_maxconn = compute_ideal_maxconn();

	if (!global.rlimit_memmax) {
		if (global.maxconn == 0) {
			global.maxconn = ideal_maxconn;
			if (global.mode & (MODE_VERBOSE|MODE_DEBUG))
				fprintf(stderr, "Note: setting global.maxconn to %d.\n", global.maxconn);
		}
	}
#ifdef USE_OPENSSL
	else if (!global.maxconn && !global.maxsslconn &&
		 (global.ssl_used_frontend || global.ssl_used_backend)) {
		/* memmax is set, compute everything automatically. Here we want
		 * to ensure that all SSL connections will be served. We take
		 * care of the number of sides where SSL is used, and consider
		 * the worst case : SSL used on both sides and doing a handshake
		 * simultaneously. Note that we can't have more than maxconn
		 * handshakes at a time by definition, so for the worst case of
		 * two SSL conns per connection, we count a single handshake.
		 */
		int sides = !!global.ssl_used_frontend + !!global.ssl_used_backend;
		int64_t mem = global.rlimit_memmax * 1048576ULL;
		int retried = 0;

		mem -= global.tune.sslcachesize * 200; // about 200 bytes per SSL cache entry
		mem -= global.maxzlibmem;
		mem = mem * MEM_USABLE_RATIO;

		/* Principle: we test once to set maxconn according to the free
		 * memory. If it results in values the system rejects, we try a
		 * second time by respecting rlim_fd_max. If it fails again, we
		 * go back to the initial value and will let the final code
		 * dealing with rlimit report the error. That's up to 3 attempts.
		 */
		do {
			global.maxconn = mem /
				((STREAM_MAX_COST + 2 * global.tune.bufsize) +    // stream + 2 buffers per stream
				 sides * global.ssl_session_max_cost +            // SSL buffers, one per side
				 global.ssl_handshake_max_cost);                  // 1 handshake per connection max

			if (retried == 1)
				global.maxconn = MIN(global.maxconn, ideal_maxconn);
			global.maxconn = round_2dig(global.maxconn);
#ifdef SYSTEM_MAXCONN
			if (global.maxconn > SYSTEM_MAXCONN)
				global.maxconn = SYSTEM_MAXCONN;
#endif /* SYSTEM_MAXCONN */
			global.maxsslconn = sides * global.maxconn;

			if (check_if_maxsock_permitted(compute_ideal_maxsock(global.maxconn)))
				break;
		} while (retried++ < 2);

		if (global.mode & (MODE_VERBOSE|MODE_DEBUG))
			fprintf(stderr, "Note: setting global.maxconn to %d and global.maxsslconn to %d.\n",
			        global.maxconn, global.maxsslconn);
	}
	else if (!global.maxsslconn &&
		 (global.ssl_used_frontend || global.ssl_used_backend)) {
		/* memmax and maxconn are known, compute maxsslconn automatically.
		 * maxsslconn being forced, we don't know how many of it will be
		 * on each side if both sides are being used. The worst case is
		 * when all connections use only one SSL instance because
		 * handshakes may be on two sides at the same time.
		 */
		int sides = !!global.ssl_used_frontend + !!global.ssl_used_backend;
		int64_t mem = global.rlimit_memmax * 1048576ULL;
		int64_t sslmem;

		mem -= global.tune.sslcachesize * 200; // about 200 bytes per SSL cache entry
		mem -= global.maxzlibmem;
		mem = mem * MEM_USABLE_RATIO;

		sslmem = mem - global.maxconn * (int64_t)(STREAM_MAX_COST + 2 * global.tune.bufsize);
		global.maxsslconn = sslmem / (global.ssl_session_max_cost + global.ssl_handshake_max_cost);
		global.maxsslconn = round_2dig(global.maxsslconn);

		if (sslmem <= 0 || global.maxsslconn < sides) {
			ha_alert("Cannot compute the automatic maxsslconn because global.maxconn is already too "
				 "high for the global.memmax value (%d MB). The absolute maximum possible value "
				 "without SSL is %d, but %d was found and SSL is in use.\n",
				 global.rlimit_memmax,
				 (int)(mem / (STREAM_MAX_COST + 2 * global.tune.bufsize)),
				 global.maxconn);
			exit(1);
		}

		if (global.maxsslconn > sides * global.maxconn)
			global.maxsslconn = sides * global.maxconn;

		if (global.mode & (MODE_VERBOSE|MODE_DEBUG))
			fprintf(stderr, "Note: setting global.maxsslconn to %d\n", global.maxsslconn);
	}
#endif
	else if (!global.maxconn) {
		/* memmax and maxsslconn are known/unused, compute maxconn automatically */
		int sides = !!global.ssl_used_frontend + !!global.ssl_used_backend;
		int64_t mem = global.rlimit_memmax * 1048576ULL;
		int64_t clearmem;
		int retried = 0;

		if (global.ssl_used_frontend || global.ssl_used_backend)
			mem -= global.tune.sslcachesize * 200; // about 200 bytes per SSL cache entry

		mem -= global.maxzlibmem;
		mem = mem * MEM_USABLE_RATIO;

		clearmem = mem;
		if (sides)
			clearmem -= (global.ssl_session_max_cost + global.ssl_handshake_max_cost) * (int64_t)global.maxsslconn;

		/* Principle: we test once to set maxconn according to the free
		 * memory. If it results in values the system rejects, we try a
		 * second time by respecting rlim_fd_max. If it fails again, we
		 * go back to the initial value and will let the final code
		 * dealing with rlimit report the error. That's up to 3 attempts.
		 */
		do {
			global.maxconn = clearmem / (STREAM_MAX_COST + 2 * global.tune.bufsize);
			if (retried == 1)
				global.maxconn = MIN(global.maxconn, ideal_maxconn);
			global.maxconn = round_2dig(global.maxconn);
#ifdef SYSTEM_MAXCONN
			if (global.maxconn > SYSTEM_MAXCONN)
				global.maxconn = SYSTEM_MAXCONN;
#endif /* SYSTEM_MAXCONN */

			if (clearmem <= 0 || !global.maxconn) {
				ha_alert("Cannot compute the automatic maxconn because global.maxsslconn is already too "
					 "high for the global.memmax value (%d MB). The absolute maximum possible value "
					 "is %d, but %d was found.\n",
					 global.rlimit_memmax,
				 (int)(mem / (global.ssl_session_max_cost + global.ssl_handshake_max_cost)),
					 global.maxsslconn);
				exit(1);
			}

			if (check_if_maxsock_permitted(compute_ideal_maxsock(global.maxconn)))
				break;
		} while (retried++ < 2);

		if (global.mode & (MODE_VERBOSE|MODE_DEBUG)) {
			if (sides && global.maxsslconn > sides * global.maxconn) {
				fprintf(stderr, "Note: global.maxsslconn is forced to %d which causes global.maxconn "
				        "to be limited to %d. Better reduce global.maxsslconn to get more "
				        "room for extra connections.\n", global.maxsslconn, global.maxconn);
			}
			fprintf(stderr, "Note: setting global.maxconn to %d\n", global.maxconn);
		}
	}

	global.maxsock = compute_ideal_maxsock(global.maxconn);
	global.hardmaxconn = global.maxconn;
	if (!global.maxpipes)
		global.maxpipes = compute_ideal_maxpipes();

	/* update connection pool thresholds */
	global.tune.pool_low_count  = ((long long)global.maxsock * global.tune.pool_low_ratio  + 99) / 100;
	global.tune.pool_high_count = ((long long)global.maxsock * global.tune.pool_high_ratio + 99) / 100;

	proxy_adjust_all_maxconn();

	if (global.tune.maxpollevents <= 0)
		global.tune.maxpollevents = MAX_POLL_EVENTS;

	if (global.tune.runqueue_depth <= 0) {
		/* tests on various thread counts from 1 to 64 have shown an
		 * optimal queue depth following roughly 1/sqrt(threads).
		 */
		int s = my_flsl(global.nbthread);
		s += (global.nbthread / s); // roughly twice the sqrt.
		global.tune.runqueue_depth = RUNQUEUE_DEPTH * 2 / s;
	}

	if (global.tune.recv_enough == 0)
		global.tune.recv_enough = MIN_RECV_AT_ONCE_ENOUGH;

	if (global.tune.maxrewrite >= global.tune.bufsize / 2)
		global.tune.maxrewrite = global.tune.bufsize / 2;

	usermsgs_clr(NULL);

	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_DEBUG | MODE_FOREGROUND));
	}

	if (arg_mode & MODE_DAEMON) {
		/* command line daemon mode inhibits foreground and debug modes mode */
		global.mode &= ~(MODE_DEBUG | MODE_FOREGROUND);
		global.mode |= arg_mode & MODE_DAEMON;
	}

	global.mode |= (arg_mode & (MODE_QUIET | MODE_VERBOSE));

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

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

	/* Realloc trash buffers because global.tune.bufsize may have changed */
	if (!init_trash_buffers(0)) {
		ha_alert("failed to initialize trash buffers.\n");
		exit(1);
	}

	if (!init_log_buffers()) {
		ha_alert("failed to initialize log buffers.\n");
		exit(1);
	}

	/*
	 * Note: we could register external pollers here.
	 * Built-in pollers have been registered before main().
	 */

	if (!(global.tune.options & GTUNE_USE_KQUEUE))
		disable_poller("kqueue");

	if (!(global.tune.options & GTUNE_USE_EVPORTS))
		disable_poller("evports");

	if (!(global.tune.options & GTUNE_USE_EPOLL))
		disable_poller("epoll");

	if (!(global.tune.options & GTUNE_USE_POLL))
		disable_poller("poll");

	if (!(global.tune.options & GTUNE_USE_SELECT))
		disable_poller("select");

	/* Note: we could disable any poller by name here */

	if (global.mode & (MODE_VERBOSE|MODE_DEBUG)) {
		list_pollers(stderr);
		fprintf(stderr, "\n");
		list_filters(stderr);
	}

	if (!init_pollers()) {
		ha_alert("No polling mechanism available.\n"
			 "  It is likely that haproxy was built with TARGET=generic and that FD_SETSIZE\n"
			 "  is too low on this platform to support maxconn and the number of listeners\n"
			 "  and servers. You should rebuild haproxy specifying your system using TARGET=\n"
			 "  in order to support other polling systems (poll, epoll, kqueue) or reduce the\n"
			 "  global maxconn setting to accommodate the system's limitation. For reference,\n"
			 "  FD_SETSIZE=%d on this system, global.maxconn=%d resulting in a maximum of\n"
			 "  %d file descriptors. You should thus reduce global.maxconn by %d. Also,\n"
			 "  check build settings using 'haproxy -vv'.\n\n",
			 FD_SETSIZE, global.maxconn, global.maxsock, (global.maxsock + 1 - FD_SETSIZE) / 2);
		exit(1);
	}
	if (global.mode & (MODE_VERBOSE|MODE_DEBUG)) {
		printf("Using %s() as the polling mechanism.\n", cur_poller.name);
	}

	if (!global.node)
		global.node = strdup(hostname);

	/* stop disabled proxies */
	for (px = proxies_list; px; px = px->next) {
		if (px->flags & (PR_FL_DISABLED|PR_FL_STOPPED))
			stop_proxy(px);
	}

	if (!hlua_post_init())
		exit(1);
}

void deinit(void)
{
	struct proxy *p = proxies_list, *p0;
	struct wordlist *wl, *wlb;
	struct uri_auth *uap, *ua = NULL;
	struct logsrv *log, *logb;
	struct build_opts_str *bol, *bolb;
	struct post_deinit_fct *pdf, *pdfb;
	struct proxy_deinit_fct *pxdf, *pxdfb;
	struct server_deinit_fct *srvdf, *srvdfb;
	struct per_thread_init_fct *tif, *tifb;
	struct per_thread_deinit_fct *tdf, *tdfb;
	struct per_thread_alloc_fct *taf, *tafb;
	struct per_thread_free_fct *tff, *tffb;
	struct post_server_check_fct *pscf, *pscfb;
	struct post_check_fct *pcf, *pcfb;
	struct post_proxy_check_fct *ppcf, *ppcfb;
	int cur_fd;

	/* At this point the listeners state is weird:
	 *  - most listeners are still bound and referenced in their protocol
	 *  - some might be zombies that are not in their proto anymore, but
	 *    still appear in their proxy's listeners with a valid FD.
	 *  - some might be stopped and still appear in their proxy as FD #-1
	 *  - among all of them, some might be inherited hence shared and we're
	 *    not allowed to pause them or whatever, we must just close them.
	 *  - finally some are not listeners (pipes, logs, stdout, etc) and
	 *    must be left intact.
	 *
	 * The safe way to proceed is to unbind (and close) whatever is not yet
	 * unbound so that no more receiver/listener remains alive. Then close
	 * remaining listener FDs, which correspond to zombie listeners (those
	 * belonging to disabled proxies that were in another process).
	 * objt_listener() would be cleaner here but not converted yet.
	 */
	protocol_unbind_all();

	for (cur_fd = 0; cur_fd < global.maxsock; cur_fd++) {
		if (!fdtab || !fdtab[cur_fd].owner)
			continue;

		if (fdtab[cur_fd].iocb == &sock_accept_iocb) {
			struct listener *l = fdtab[cur_fd].owner;

			BUG_ON(l->state != LI_INIT);
			unbind_listener(l);
		}
	}

	deinit_signals();
	while (p) {
		/* build a list of unique uri_auths */
		if (!ua)
			ua = p->uri_auth;
		else {
			/* check if p->uri_auth is unique */
			for (uap = ua; uap; uap=uap->next)
				if (uap == p->uri_auth)
					break;

			if (!uap && p->uri_auth) {
				/* add it, if it is */
				p->uri_auth->next = ua;
				ua = p->uri_auth;
			}
		}

		p0 = p;
		p = p->next;
		free_proxy(p0);
	}/* end while(p) */

	/* destroy all referenced defaults proxies  */
	proxy_destroy_all_unref_defaults();

	while (ua) {
		struct stat_scope *scope, *scopep;

		uap = ua;
		ua = ua->next;

		free(uap->uri_prefix);
		free(uap->auth_realm);
		free(uap->node);
		free(uap->desc);

		userlist_free(uap->userlist);
		free_act_rules(&uap->http_req_rules);

		scope = uap->scope;
		while (scope) {
			scopep = scope;
			scope = scope->next;

			free(scopep->px_id);
			free(scopep);
		}

		free(uap);
	}

	userlist_free(userlist);

	cfg_unregister_sections();

	deinit_log_buffers();

	list_for_each_entry(pdf, &post_deinit_list, list)
		pdf->fct();

	ha_free(&global.log_send_hostname);
	chunk_destroy(&global.log_tag);
	ha_free(&global.chroot);
	ha_free(&global.pidfile);
	ha_free(&global.node);
	ha_free(&global.desc);
	ha_free(&oldpids);
	ha_free(&old_argv);
	ha_free(&localpeer);
	ha_free(&global.server_state_base);
	ha_free(&global.server_state_file);
	task_destroy(idle_conn_task);
	idle_conn_task = NULL;

	list_for_each_entry_safe(log, logb, &global.logsrvs, list) {
			LIST_DELETE(&log->list);
			free(log->conf.file);
			free(log);
		}
	list_for_each_entry_safe(wl, wlb, &cfg_cfgfiles, list) {
		free(wl->s);
		LIST_DELETE(&wl->list);
		free(wl);
	}

	list_for_each_entry_safe(bol, bolb, &build_opts_list, list) {
		if (bol->must_free)
			free((void *)bol->str);
		LIST_DELETE(&bol->list);
		free(bol);
	}

	list_for_each_entry_safe(pxdf, pxdfb, &proxy_deinit_list, list) {
		LIST_DELETE(&pxdf->list);
		free(pxdf);
	}

	list_for_each_entry_safe(pdf, pdfb, &post_deinit_list, list) {
		LIST_DELETE(&pdf->list);
		free(pdf);
	}

	list_for_each_entry_safe(srvdf, srvdfb, &server_deinit_list, list) {
		LIST_DELETE(&srvdf->list);
		free(srvdf);
	}

	list_for_each_entry_safe(pcf, pcfb, &post_check_list, list) {
		LIST_DELETE(&pcf->list);
		free(pcf);
	}

	list_for_each_entry_safe(pscf, pscfb, &post_server_check_list, list) {
		LIST_DELETE(&pscf->list);
		free(pscf);
	}

	list_for_each_entry_safe(ppcf, ppcfb, &post_proxy_check_list, list) {
		LIST_DELETE(&ppcf->list);
		free(ppcf);
	}

	list_for_each_entry_safe(tif, tifb, &per_thread_init_list, list) {
		LIST_DELETE(&tif->list);
		free(tif);
	}

	list_for_each_entry_safe(tdf, tdfb, &per_thread_deinit_list, list) {
		LIST_DELETE(&tdf->list);
		free(tdf);
	}

	list_for_each_entry_safe(taf, tafb, &per_thread_alloc_list, list) {
		LIST_DELETE(&taf->list);
		free(taf);
	}

	list_for_each_entry_safe(tff, tffb, &per_thread_free_list, list) {
		LIST_DELETE(&tff->list);
		free(tff);
	}

	vars_prune(&proc_vars, NULL, NULL);
	pool_destroy_all();
	deinit_pollers();
} /* end deinit() */

__attribute__((noreturn)) void deinit_and_exit(int status)
{
	global.mode |= MODE_STOPPING;
	deinit();
	exit(status);
}

/* Runs the polling loop */
void run_poll_loop()
{
	int next, wake;

	clock_update_date(0,1);
	while (1) {
		wake_expired_tasks();

		/* check if we caught some signals and process them in the
		 first thread */
		if (signal_queue_len && tid == 0) {
			activity[tid].wake_signal++;
			signal_process_queue();
		}

		/* Process a few tasks */
		process_runnable_tasks();

		/* also stop  if we failed to cleanly stop all tasks */
		if (killed > 1)
			break;

		/* expire immediately if events are pending */
		wake = 1;
		if (thread_has_tasks())
			activity[tid].wake_tasks++;
		else {
			_HA_ATOMIC_OR(&sleeping_thread_mask, tid_bit);
			__ha_barrier_atomic_store();
			if (thread_has_tasks()) {
				activity[tid].wake_tasks++;
				_HA_ATOMIC_AND(&sleeping_thread_mask, ~tid_bit);
			} else
				wake = 0;
		}

		if (!wake) {
			int i;

			if (stopping) {
				/* stop muxes before acknowledging stopping */
				if (!(stopping_thread_mask & tid_bit)) {
					task_wakeup(mux_stopping_data[tid].task, TASK_WOKEN_OTHER);
					wake = 1;
				}

				if (_HA_ATOMIC_OR_FETCH(&stopping_thread_mask, tid_bit) == tid_bit) {
					/* notify all threads that stopping was just set */
					for (i = 0; i < global.nbthread; i++)
						if (((all_threads_mask & ~stopping_thread_mask) >> i) & 1)
							wake_thread(i);
				}
			}

			/* stop when there's nothing left to do */
			if ((jobs - unstoppable_jobs) == 0 &&
			    (stopping_thread_mask & all_threads_mask) == all_threads_mask) {
				/* wake all threads waiting on jobs==0 */
				for (i = 0; i < global.nbthread; i++)
					if (((all_threads_mask & ~tid_bit) >> i) & 1)
						wake_thread(i);
				break;
			}
		}

		/* If we have to sleep, measure how long */
		next = wake ? TICK_ETERNITY : next_timer_expiry();

		/* The poller will ensure it returns around <next> */
		cur_poller.poll(&cur_poller, next, wake);

		activity[tid].loops++;
	}
}

static void *run_thread_poll_loop(void *data)
{
	struct per_thread_alloc_fct  *ptaf;
	struct per_thread_init_fct   *ptif;
	struct per_thread_deinit_fct *ptdf;
	struct per_thread_free_fct   *ptff;
	static int init_left = 0;
	__decl_thread(static pthread_mutex_t init_mutex = PTHREAD_MUTEX_INITIALIZER);
	__decl_thread(static pthread_cond_t  init_cond  = PTHREAD_COND_INITIALIZER);

	ha_set_thread(data);
	set_thread_cpu_affinity();
	clock_set_local_source();

	/* Now, initialize one thread init at a time. This is better since
	 * some init code is a bit tricky and may release global resources
	 * after reallocating them locally. This will also ensure there is
	 * no race on file descriptors allocation.
	 */
#ifdef USE_THREAD
	pthread_mutex_lock(&init_mutex);
#endif
	/* The first thread must set the number of threads left */
	if (!init_left)
		init_left = global.nbthread;
	init_left--;

	clock_init_thread_date();

	/* per-thread alloc calls performed here are not allowed to snoop on
	 * other threads, so they are free to initialize at their own rhythm
	 * as long as they act as if they were alone. None of them may rely
	 * on resources initialized by the other ones.
	 */
	list_for_each_entry(ptaf, &per_thread_alloc_list, list) {
		if (!ptaf->fct()) {
			ha_alert("failed to allocate resources for thread %u.\n", tid);
#ifdef USE_THREAD
			pthread_mutex_unlock(&init_mutex);
#endif
			exit(1);
		}
	}

	/* per-thread init calls performed here are not allowed to snoop on
	 * other threads, so they are free to initialize at their own rhythm
	 * as long as they act as if they were alone.
	 */
	list_for_each_entry(ptif, &per_thread_init_list, list) {
		if (!ptif->fct()) {
			ha_alert("failed to initialize thread %u.\n", tid);
#ifdef USE_THREAD
			pthread_mutex_unlock(&init_mutex);
#endif
			exit(1);
		}
	}

	/* enabling protocols will result in fd_insert() calls to be performed,
	 * we want all threads to have already allocated their local fd tables
	 * before doing so, thus only the last thread does it.
	 */
	if (init_left == 0)
		protocol_enable_all();

#ifdef USE_THREAD
	pthread_cond_broadcast(&init_cond);
	pthread_mutex_unlock(&init_mutex);

	/* now wait for other threads to finish starting */
	pthread_mutex_lock(&init_mutex);
	while (init_left)
		pthread_cond_wait(&init_cond, &init_mutex);
	pthread_mutex_unlock(&init_mutex);
#endif

#if defined(PR_SET_NO_NEW_PRIVS) && defined(USE_PRCTL)
	/* Let's refrain from using setuid executables. This way the impact of
	 * an eventual vulnerability in a library remains limited. It may
	 * impact external checks but who cares about them anyway ? In the
	 * worst case it's possible to disable the option. Obviously we do this
	 * in workers only. We can't hard-fail on this one as it really is
	 * implementation dependent though we're interested in feedback, hence
	 * the warning.
	 */
	if (!(global.tune.options & GTUNE_INSECURE_SETUID) && !master) {
		static int warn_fail;
		if (prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0) == -1 && !_HA_ATOMIC_FETCH_ADD(&warn_fail, 1)) {
			ha_warning("Failed to disable setuid, please report to developers with detailed "
				   "information about your operating system. You can silence this warning "
				   "by adding 'insecure-setuid-wanted' in the 'global' section.\n");
		}
	}
#endif

#if defined(RLIMIT_NPROC)
	/* all threads have started, it's now time to prevent any new thread
	 * or process from starting. Obviously we do this in workers only. We
	 * can't hard-fail on this one as it really is implementation dependent
	 * though we're interested in feedback, hence the warning.
	 */
	if (!(global.tune.options & GTUNE_INSECURE_FORK) && !master) {
		struct rlimit limit = { .rlim_cur = 0, .rlim_max = 0 };
		static int warn_fail;

		if (setrlimit(RLIMIT_NPROC, &limit) == -1 && !_HA_ATOMIC_FETCH_ADD(&warn_fail, 1)) {
			ha_warning("Failed to disable forks, please report to developers with detailed "
				   "information about your operating system. You can silence this warning "
				   "by adding 'insecure-fork-wanted' in the 'global' section.\n");
		}
	}
#endif
	run_poll_loop();

	list_for_each_entry(ptdf, &per_thread_deinit_list, list)
		ptdf->fct();

	list_for_each_entry(ptff, &per_thread_free_list, list)
		ptff->fct();

#ifdef USE_THREAD
	_HA_ATOMIC_AND(&all_threads_mask, ~tid_bit);
	if (tid > 0)
		pthread_exit(NULL);
#endif
	return NULL;
}

/* set uid/gid depending on global settings */
static void set_identity(const char *program_name)
{
	if (global.gid) {
		if (getgroups(0, NULL) > 0 && setgroups(0, NULL) == -1)
			ha_warning("[%s.main()] Failed to drop supplementary groups. Using 'gid'/'group'"
				   " without 'uid'/'user' is generally useless.\n", program_name);

		if (setgid(global.gid) == -1) {
			ha_alert("[%s.main()] Cannot set gid %d.\n", program_name, global.gid);
			protocol_unbind_all();
			exit(1);
		}
	}

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

int main(int argc, char **argv)
{
	int err, retry;
	struct rlimit limit;
	int pidfd = -1;
	int intovf = (unsigned char)argc + 1; /* let the compiler know it's strictly positive */

	/* Catch forced CFLAGS that miss 2-complement integer overflow */
	if (intovf + 0x7FFFFFFF >= intovf) {
		fprintf(stderr,
		        "FATAL ERROR: invalid code detected -- cannot go further, please recompile!\n"
			"The source code was miscompiled by the compiler, which usually indicates that\n"
			"some of the CFLAGS needed to work around overzealous compiler optimizations\n"
			"were overwritten at build time. Please do not force CFLAGS, and read Makefile\n"
			"and INSTALL files to decide on the best way to pass your local build options.\n"
		        "\nBuild options :"
#ifdef BUILD_TARGET
		       "\n  TARGET  = " BUILD_TARGET
#endif
#ifdef BUILD_CPU
		       "\n  CPU     = " BUILD_CPU
#endif
#ifdef BUILD_CC
		       "\n  CC      = " BUILD_CC
#endif
#ifdef BUILD_CFLAGS
		       "\n  CFLAGS  = " BUILD_CFLAGS
#endif
#ifdef BUILD_OPTIONS
		       "\n  OPTIONS = " BUILD_OPTIONS
#endif
#ifdef BUILD_DEBUG
		       "\n  DEBUG   = " BUILD_DEBUG
#endif
		       "\n\n");
		return 1;
	}

	setvbuf(stdout, NULL, _IONBF, 0);

	/* take a copy of initial limits before we possibly change them */
	getrlimit(RLIMIT_NOFILE, &limit);

	if (limit.rlim_max == RLIM_INFINITY)
		limit.rlim_max = limit.rlim_cur;
	rlim_fd_cur_at_boot = limit.rlim_cur;
	rlim_fd_max_at_boot = limit.rlim_max;

	/* process all initcalls in order of potential dependency */
	RUN_INITCALLS(STG_PREPARE);
	RUN_INITCALLS(STG_LOCK);
	RUN_INITCALLS(STG_REGISTER);

	/* now's time to initialize early boot variables */
	init_early(argc, argv);

	/* handles argument parsing */
	init_args(argc, argv);

	RUN_INITCALLS(STG_ALLOC);
	RUN_INITCALLS(STG_POOL);
	RUN_INITCALLS(STG_INIT);

	/* this is the late init where the config is parsed */
	init(argc, argv);

	signal_register_fct(SIGQUIT, dump, SIGQUIT);
	signal_register_fct(SIGUSR1, sig_soft_stop, SIGUSR1);
	signal_register_fct(SIGHUP, sig_dump_state, SIGHUP);
	signal_register_fct(SIGUSR2, NULL, 0);

	/* Always catch SIGPIPE even on platforms which define MSG_NOSIGNAL.
	 * Some recent FreeBSD setups report broken pipes, and MSG_NOSIGNAL
	 * was defined there, so let's stay on the safe side.
	 */
	signal_register_fct(SIGPIPE, NULL, 0);

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

	if (global.rlimit_nofile) {
		limit.rlim_cur = global.rlimit_nofile;
		limit.rlim_max = MAX(rlim_fd_max_at_boot, limit.rlim_cur);

		if (setrlimit(RLIMIT_NOFILE, &limit) == -1) {
			getrlimit(RLIMIT_NOFILE, &limit);
			if (global.tune.options & GTUNE_STRICT_LIMITS) {
				ha_alert("[%s.main()] Cannot raise FD limit to %d, limit is %d.\n",
					 argv[0], global.rlimit_nofile, (int)limit.rlim_cur);
				exit(1);
			}
			else {
				/* try to set it to the max possible at least */
				limit.rlim_cur = limit.rlim_max;
				if (setrlimit(RLIMIT_NOFILE, &limit) != -1)
					getrlimit(RLIMIT_NOFILE, &limit);

				ha_warning("[%s.main()] Cannot raise FD limit to %d, limit is %d.\n",
					   argv[0], global.rlimit_nofile, (int)limit.rlim_cur);
				global.rlimit_nofile = limit.rlim_cur;
			}
		}
	}

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

	/* Try to get the listeners FD from the previous process using
	 * _getsocks on the stat socket, it must never been done in wait mode
	 * and check mode
	 */
	if (old_unixsocket &&
	    !(global.mode & (MODE_MWORKER_WAIT|MODE_CHECK|MODE_CHECK_CONDITION))) {
		if (strcmp("/dev/null", old_unixsocket) != 0) {
			if (sock_get_old_sockets(old_unixsocket) != 0) {
				ha_alert("Failed to get the sockets from the old process!\n");
				if (!(global.mode & MODE_MWORKER))
					exit(1);
			}
		}
	}

	/* 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 = protocol_bind_all(retry == 0 || nb_oldpids == 0);
		/* exit the loop on no error or fatal error */
		if ((err & (ERR_RETRYABLE|ERR_FATAL)) != ERR_RETRYABLE)
			break;
		if (nb_oldpids == 0 || retry == 0)
			break;

		/* FIXME-20060514: Solaris and OpenBSD do not support shutdown() on
		 * listening sockets. So on those platforms, it would be wiser to
		 * simply send SIGUSR1, which will not be undoable.
		 */
		if (tell_old_pids(SIGTTOU) == 0) {
			/* no need to wait if we can't contact old pids */
			retry = 0;
			continue;
		}
		/* 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: protocol_bind_all() sends an alert when it fails. */
	if ((err & ~ERR_WARN) != ERR_NONE) {
		ha_alert("[%s.main()] Some protocols failed to start their listeners! Exiting.\n", argv[0]);
		if (retry != MAX_START_RETRIES && nb_oldpids) {
			protocol_unbind_all(); /* cleanup everything we can */
			tell_old_pids(SIGTTIN);
		}
		exit(1);
	}

	if (!(global.mode & MODE_MWORKER_WAIT) && listeners == 0) {
		ha_alert("[%s.main()] No enabled listener found (check for 'bind' directives) ! Exiting.\n", argv[0]);
		/* Note: we don't have to send anything to the old pids because we
		 * never stopped them. */
		exit(1);
	}

	/* Ok, all listeners should now be bound, close any leftover sockets
	 * the previous process gave us, we don't need them anymore
	 */
	sock_drop_unused_old_sockets();

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

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

	if (getenv("HAPROXY_MWORKER_REEXEC") != NULL) {
		/* either stdin/out/err are already closed or should stay as they are. */
		if ((global.mode & MODE_DAEMON)) {
			/* daemon mode re-executing, stdin/stdout/stderr are already closed so keep quiet */
			global.mode &= ~MODE_VERBOSE;
			global.mode |= MODE_QUIET; /* ensure that we won't say anything from now */
		}
	} else {
		if ((global.mode & MODE_QUIET) && !(global.mode & MODE_VERBOSE)) {
			/* detach from the tty */
			stdio_quiet(-1);
		}
	}

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

	if ((global.last_checks & LSTCHK_NETADM) && global.uid) {
		ha_alert("[%s.main()] Some configuration options require full privileges, so global.uid cannot be changed.\n"
			 "", argv[0]);
		protocol_unbind_all();
		exit(1);
	}

	/* If the user is not root, we'll still let them try the configuration
	 * but we inform them that unexpected behaviour may occur.
	 */
	if ((global.last_checks & LSTCHK_NETADM) && getuid())
		ha_warning("[%s.main()] Some options which require full privileges"
			   " might not work well.\n"
			   "", argv[0]);

	if ((global.mode & (MODE_MWORKER|MODE_DAEMON)) == 0) {

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

	if (nb_oldpids && !(global.mode & MODE_MWORKER_WAIT))
		nb_oldpids = tell_old_pids(oldpids_sig);

	/* send a SIGTERM to workers who have a too high reloads number  */
	if ((global.mode & MODE_MWORKER) && !(global.mode & MODE_MWORKER_WAIT))
		mworker_kill_max_reloads(SIGTERM);

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

	if ((global.mode & (MODE_MWORKER | MODE_DAEMON)) == 0)
		set_identity(argv[0]);

	/* check ulimits */
	limit.rlim_cur = limit.rlim_max = 0;
	getrlimit(RLIMIT_NOFILE, &limit);
	if (limit.rlim_cur < global.maxsock) {
		if (global.tune.options & GTUNE_STRICT_LIMITS) {
			ha_alert("[%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], (int)limit.rlim_cur, global.maxconn, global.maxsock,
				 global.maxsock);
			exit(1);
		}
		else
			ha_alert("[%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], (int)limit.rlim_cur, global.maxconn, global.maxsock,
				 global.maxsock);
	}

	if (global.mode & (MODE_DAEMON | MODE_MWORKER | MODE_MWORKER_WAIT)) {
		int ret = 0;
		int in_parent = 0;
		int devnullfd = -1;

		/*
		 * if daemon + mworker: must fork here to let a master
		 * process live in background before forking children
		 */

		if ((getenv("HAPROXY_MWORKER_REEXEC") == NULL)
		    && (global.mode & MODE_MWORKER)
		    && (global.mode & MODE_DAEMON)) {
			ret = fork();
			if (ret < 0) {
				ha_alert("[%s.main()] Cannot fork.\n", argv[0]);
				protocol_unbind_all();
				exit(1); /* there has been an error */
			} else if (ret > 0) { /* parent leave to daemonize */
				exit(0);
			} else /* change the process group ID in the child (master process) */
				setsid();
		}


		/* if in master-worker mode, write the PID of the father */
		if (global.mode & MODE_MWORKER) {
			char pidstr[100];
			snprintf(pidstr, sizeof(pidstr), "%d\n", (int)getpid());
			if (pidfd >= 0)
				DISGUISE(write(pidfd, pidstr, strlen(pidstr)));
		}

		/* the father launches the required number of processes */
		if (!(global.mode & MODE_MWORKER_WAIT)) {
			if (global.mode & MODE_MWORKER)
				mworker_ext_launch_all();

			ret = fork();
			if (ret < 0) {
				ha_alert("[%s.main()] Cannot fork.\n", argv[0]);
				protocol_unbind_all();
				exit(1); /* there has been an error */
			}
			else if (ret == 0) { /* child breaks here */
				/* This one must not be exported, it's internal! */
				unsetenv("HAPROXY_MWORKER_REEXEC");
				ha_random_jump96(1);
			}
			else { /* parent here */
				in_parent = 1;

				if (pidfd >= 0 && !(global.mode & MODE_MWORKER)) {
					char pidstr[100];
					snprintf(pidstr, sizeof(pidstr), "%d\n", ret);
					DISGUISE(write(pidfd, pidstr, strlen(pidstr)));
				}
				if (global.mode & MODE_MWORKER) {
					struct mworker_proc *child;

					ha_notice("New worker (%d) forked\n", ret);
					/* find the right mworker_proc */
					list_for_each_entry(child, &proc_list, list) {
						if (child->reloads == 0 && child->options & PROC_O_TYPE_WORKER) {
							child->timestamp = now.tv_sec;
							child->pid = ret;
							child->version = strdup(haproxy_version);
							break;
						}
					}
				}
			}

		} else {
			/* wait mode */
			in_parent = 1;
		}

#ifdef USE_CPU_AFFINITY
		if (!in_parent && ha_cpuset_count(&cpu_map.proc)) {   /* only do this if the process has a CPU map */

#if defined(CPUSET_USE_CPUSET) || defined(__DragonFly__)
			struct hap_cpuset *set = &cpu_map.proc;
			sched_setaffinity(0, sizeof(set->cpuset), &set->cpuset);
#elif defined(__FreeBSD__)
			struct hap_cpuset *set = &cpu_map.proc;
			ret = cpuset_setaffinity(CPU_LEVEL_WHICH, CPU_WHICH_PID, -1, sizeof(set->cpuset), &set->cpuset);
#endif
		}
#endif
		/* close the pidfile both in children and father */
		if (pidfd >= 0) {
			//lseek(pidfd, 0, SEEK_SET);  /* debug: emulate eglibc bug */
			close(pidfd);
		}

		/* We won't ever use this anymore */
		ha_free(&global.pidfile);

		if (in_parent) {
			if (global.mode & (MODE_MWORKER|MODE_MWORKER_WAIT)) {
				master = 1;

				if ((!(global.mode & MODE_QUIET) || (global.mode & MODE_VERBOSE)) &&
					(global.mode & MODE_DAEMON)) {
					/* detach from the tty, this is required to properly daemonize. */
					if ((getenv("HAPROXY_MWORKER_REEXEC") == NULL))
						stdio_quiet(-1);

					global.mode &= ~MODE_VERBOSE;
					global.mode |= MODE_QUIET; /* ensure that we won't say anything from now */
				}

				if (global.mode & MODE_MWORKER_WAIT) {
					/* only the wait mode handles the master CLI */
					mworker_loop();
				} else {

					/* if not in wait mode, reload in wait mode to free the memory */
					ha_notice("Loading success.\n");
					proc_self->failedreloads = 0; /* reset the number of failure */
					mworker_reexec_waitmode();
				}
				/* should never get there */
				exit(EXIT_FAILURE);
			}
#if defined(USE_OPENSSL) && !defined(OPENSSL_NO_DH)
			ssl_free_dh();
#endif
			exit(0); /* parent must leave */
		}

		/* child must never use the atexit function */
		atexit_flag = 0;

		/* close useless master sockets */
		if (global.mode & MODE_MWORKER) {
			struct mworker_proc *child, *it;
			master = 0;

			mworker_cli_proxy_stop();

			/* free proc struct of other processes  */
			list_for_each_entry_safe(child, it, &proc_list, list) {
				/* close the FD of the master side for all
				 * workers, we don't need to close the worker
				 * side of other workers since it's done with
				 * the bind_proc */
				if (child->ipc_fd[0] >= 0) {
					close(child->ipc_fd[0]);
					child->ipc_fd[0] = -1;
				}
				if (child->options & PROC_O_TYPE_WORKER &&
				    child->reloads == 0) {
					/* keep this struct if this is our pid */
					proc_self = child;
					continue;
				}
				LIST_DELETE(&child->list);
				mworker_free_child(child);
				child = NULL;
			}
		}

		if (!(global.mode & MODE_QUIET) || (global.mode & MODE_VERBOSE)) {
			devnullfd = open("/dev/null", O_RDWR, 0);
			if (devnullfd < 0) {
				ha_alert("Cannot open /dev/null\n");
				exit(EXIT_FAILURE);
			}
		}

		/* Must chroot and setgid/setuid in the children */
		/* chroot if needed */
		if (global.chroot != NULL) {
			if (chroot(global.chroot) == -1 || chdir("/") == -1) {
				ha_alert("[%s.main()] Cannot chroot(%s).\n", argv[0], global.chroot);
				if (nb_oldpids)
					tell_old_pids(SIGTTIN);
				protocol_unbind_all();
				exit(1);
			}
		}

		ha_free(&global.chroot);
		set_identity(argv[0]);

		/* pass through every cli socket, and check if it's bound to
		 * the current process and if it exposes listeners sockets.
		 * Caution: the GTUNE_SOCKET_TRANSFER is now set after the fork.
		 * */

		if (global.cli_fe) {
			struct bind_conf *bind_conf;

			list_for_each_entry(bind_conf, &global.cli_fe->conf.bind, by_fe) {
				if (bind_conf->level & ACCESS_FD_LISTENERS) {
					global.tune.options |= GTUNE_SOCKET_TRANSFER;
					break;
				}
			}
		}

		/*
		 * This is only done in daemon mode because we might want the
		 * logs on stdout in mworker mode. 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_DAEMON) &&
		    (!(global.mode & MODE_QUIET) || (global.mode & MODE_VERBOSE))) {
			/* detach from the tty */
			stdio_quiet(devnullfd);
			global.mode &= ~MODE_VERBOSE;
			global.mode |= MODE_QUIET; /* ensure that we won't say anything from now */
		}
		pid = getpid(); /* update child's pid */
		if (!(global.mode & MODE_MWORKER)) /* in mworker mode we don't want a new pgid for the children */
			setsid();
		fork_poller();
	}

	/* try our best to re-enable core dumps depending on system capabilities.
	 * What is addressed here :
	 *   - remove file size limits
	 *   - remove core size limits
	 *   - mark the process dumpable again if it lost it due to user/group
	 */
	if (global.tune.options & GTUNE_SET_DUMPABLE) {
		limit.rlim_cur = limit.rlim_max = RLIM_INFINITY;

#if defined(RLIMIT_FSIZE)
		if (setrlimit(RLIMIT_FSIZE, &limit) == -1) {
			if (global.tune.options & GTUNE_STRICT_LIMITS) {
				ha_alert("[%s.main()] Failed to set the raise the maximum "
					 "file size.\n", argv[0]);
				exit(1);
			}
			else
				ha_warning("[%s.main()] Failed to set the raise the maximum "
					   "file size.\n", argv[0]);
		}
#endif

#if defined(RLIMIT_CORE)
		if (setrlimit(RLIMIT_CORE, &limit) == -1) {
			if (global.tune.options & GTUNE_STRICT_LIMITS) {
				ha_alert("[%s.main()] Failed to set the raise the core "
					 "dump size.\n", argv[0]);
				exit(1);
			}
			else
				ha_warning("[%s.main()] Failed to set the raise the core "
					   "dump size.\n", argv[0]);
		}
#endif

#if defined(USE_PRCTL)
		if (prctl(PR_SET_DUMPABLE, 1, 0, 0, 0) == -1)
			ha_warning("[%s.main()] Failed to set the dumpable flag, "
				   "no core will be dumped.\n", argv[0]);
#elif defined(USE_PROCCTL)
		{
			int traceable = PROC_TRACE_CTL_ENABLE;
			if (procctl(P_PID, getpid(), PROC_TRACE_CTL, &traceable) == -1)
				ha_warning("[%s.main()] Failed to set the traceable flag, "
					   "no core will be dumped.\n", argv[0]);
		}
#endif
	}

	global.mode &= ~MODE_STARTING;
	reset_usermsgs_ctx();

	/* start threads 2 and above */
	setup_extra_threads(&run_thread_poll_loop);

	/* when multithreading we need to let only the thread 0 handle the signals */
	haproxy_unblock_signals();

	/* Finally, start the poll loop for the first thread */
	run_thread_poll_loop(&ha_thread_info[0]);

	/* wait for all threads to terminate */
	wait_for_threads_completion();

	deinit_and_exit(0);
}

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