src/checks.c

/*
 * Health-checks functions.
 *
 * Copyright 2000-2009 Willy Tarreau <w@1wt.eu>
 * Copyright 2007-2009 Krzysztof Piotr Oledzki <ole@ans.pl>
 *
 * 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.
 *
 */

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

#include <common/cfgparse.h>
#include <common/chunk.h>
#include <common/compat.h>
#include <common/config.h>
#include <common/mini-clist.h>
#include <common/standard.h>
#include <common/time.h>
#include <common/hathreads.h>
#include <common/http.h>
#include <common/h1.h>
#include <common/htx.h>

#include <types/global.h>
#include <types/dns.h>
#include <types/stats.h>

#include <proto/action.h>
#include <proto/arg.h>
#include <proto/backend.h>
#include <proto/checks.h>
#include <proto/stats.h>
#include <proto/fd.h>
#include <proto/http_htx.h>
#include <proto/log.h>
#include <proto/mux_pt.h>
#include <proto/queue.h>
#include <proto/port_range.h>
#include <proto/proto_tcp.h>
#include <proto/protocol.h>
#include <proto/proxy.h>
#include <proto/server.h>
#include <proto/signal.h>
#include <proto/stream_interface.h>
#include <proto/task.h>
#include <proto/vars.h>
#include <proto/log.h>
#include <proto/dns.h>
#include <proto/proto_udp.h>
#include <proto/ssl_sock.h>
#include <proto/sample.h>

static int tcpcheck_get_step_id(struct check *, struct tcpcheck_rule *);

static int wake_srv_chk(struct conn_stream *cs);
struct data_cb check_conn_cb = {
	.wake = wake_srv_chk,
	.name = "CHCK",
};

/* Global tree to share all tcp-checks */
struct eb_root shared_tcpchecks = EB_ROOT;


DECLARE_STATIC_POOL(pool_head_email_alert,   "email_alert",   sizeof(struct email_alert));
DECLARE_STATIC_POOL(pool_head_tcpcheck_rule, "tcpcheck_rule", sizeof(struct tcpcheck_rule));

/* Dummy frontend used to create all checks sessions. */
static struct proxy checks_fe;

/**************************************************************************/
/************************ Handle check results ****************************/
/**************************************************************************/
struct check_status {
	short result;			/* one of SRV_CHK_* */
	char *info;			/* human readable short info */
	char *desc;			/* long description */
};

struct analyze_status {
	char *desc;				/* description */
	unsigned char lr[HANA_OBS_SIZE];	/* result for l4/l7: 0 = ignore, 1 - error, 2 - OK */
};

static const struct check_status check_statuses[HCHK_STATUS_SIZE] = {
	[HCHK_STATUS_UNKNOWN]	= { CHK_RES_UNKNOWN,  "UNK",     "Unknown" },
	[HCHK_STATUS_INI]	= { CHK_RES_UNKNOWN,  "INI",     "Initializing" },
	[HCHK_STATUS_START]	= { /* SPECIAL STATUS*/ },

	/* Below we have finished checks */
	[HCHK_STATUS_CHECKED]	= { CHK_RES_NEUTRAL,  "CHECKED", "No status change" },
	[HCHK_STATUS_HANA]	= { CHK_RES_FAILED,   "HANA",    "Health analyze" },

	[HCHK_STATUS_SOCKERR]	= { CHK_RES_FAILED,   "SOCKERR", "Socket error" },

	[HCHK_STATUS_L4OK]	= { CHK_RES_PASSED,   "L4OK",    "Layer4 check passed" },
	[HCHK_STATUS_L4TOUT]	= { CHK_RES_FAILED,   "L4TOUT",  "Layer4 timeout" },
	[HCHK_STATUS_L4CON]	= { CHK_RES_FAILED,   "L4CON",   "Layer4 connection problem" },

	[HCHK_STATUS_L6OK]	= { CHK_RES_PASSED,   "L6OK",    "Layer6 check passed" },
	[HCHK_STATUS_L6TOUT]	= { CHK_RES_FAILED,   "L6TOUT",  "Layer6 timeout" },
	[HCHK_STATUS_L6RSP]	= { CHK_RES_FAILED,   "L6RSP",   "Layer6 invalid response" },

	[HCHK_STATUS_L7TOUT]	= { CHK_RES_FAILED,   "L7TOUT",  "Layer7 timeout" },
	[HCHK_STATUS_L7RSP]	= { CHK_RES_FAILED,   "L7RSP",   "Layer7 invalid response" },

	[HCHK_STATUS_L57DATA]	= { /* DUMMY STATUS */ },

	[HCHK_STATUS_L7OKD]	= { CHK_RES_PASSED,   "L7OK",    "Layer7 check passed" },
	[HCHK_STATUS_L7OKCD]	= { CHK_RES_CONDPASS, "L7OKC",   "Layer7 check conditionally passed" },
	[HCHK_STATUS_L7STS]	= { CHK_RES_FAILED,   "L7STS",   "Layer7 wrong status" },

	[HCHK_STATUS_PROCERR]	= { CHK_RES_FAILED,   "PROCERR",  "External check error" },
	[HCHK_STATUS_PROCTOUT]	= { CHK_RES_FAILED,   "PROCTOUT", "External check timeout" },
	[HCHK_STATUS_PROCOK]	= { CHK_RES_PASSED,   "PROCOK",   "External check passed" },
};

static const struct analyze_status analyze_statuses[HANA_STATUS_SIZE] = {		/* 0: ignore, 1: error, 2: OK */
	[HANA_STATUS_UNKNOWN]		= { "Unknown",                         { 0, 0 }},

	[HANA_STATUS_L4_OK]		= { "L4 successful connection",        { 2, 0 }},
	[HANA_STATUS_L4_ERR]		= { "L4 unsuccessful connection",      { 1, 1 }},

	[HANA_STATUS_HTTP_OK]		= { "Correct http response",           { 0, 2 }},
	[HANA_STATUS_HTTP_STS]		= { "Wrong http response",             { 0, 1 }},
	[HANA_STATUS_HTTP_HDRRSP]	= { "Invalid http response (headers)", { 0, 1 }},
	[HANA_STATUS_HTTP_RSP]		= { "Invalid http response",           { 0, 1 }},

	[HANA_STATUS_HTTP_READ_ERROR]	= { "Read error (http)",               { 0, 1 }},
	[HANA_STATUS_HTTP_READ_TIMEOUT]	= { "Read timeout (http)",             { 0, 1 }},
	[HANA_STATUS_HTTP_BROKEN_PIPE]	= { "Close from server (http)",        { 0, 1 }},
};

/* checks if <err> is a real error for errno or one that can be ignored, and
 * return 0 for these ones or <err> for real ones.
 */
static inline int unclean_errno(int err)
{
	if (err == EAGAIN || err == EINPROGRESS ||
	    err == EISCONN || err == EALREADY)
		return 0;
	return err;
}

/* Converts check_status code to description */
const char *get_check_status_description(short check_status) {

	const char *desc;

	if (check_status < HCHK_STATUS_SIZE)
		desc = check_statuses[check_status].desc;
	else
		desc = NULL;

	if (desc && *desc)
		return desc;
	else
		return check_statuses[HCHK_STATUS_UNKNOWN].desc;
}

/* Converts check_status code to short info */
const char *get_check_status_info(short check_status) {

	const char *info;

	if (check_status < HCHK_STATUS_SIZE)
		info = check_statuses[check_status].info;
	else
		info = NULL;

	if (info && *info)
		return info;
	else
		return check_statuses[HCHK_STATUS_UNKNOWN].info;
}

/* Convert analyze_status to description */
const char *get_analyze_status(short analyze_status) {

	const char *desc;

	if (analyze_status < HANA_STATUS_SIZE)
		desc = analyze_statuses[analyze_status].desc;
	else
		desc = NULL;

	if (desc && *desc)
		return desc;
	else
		return analyze_statuses[HANA_STATUS_UNKNOWN].desc;
}

/* Sets check->status, update check->duration and fill check->result with an
 * adequate CHK_RES_* value. The new check->health is computed based on the
 * result.
 *
 * Shows information in logs about failed health check if server is UP or
 * succeeded health checks if server is DOWN.
 */
static void set_server_check_status(struct check *check, short status, const char *desc)
{
	struct server *s = check->server;
	short prev_status = check->status;
	int report = 0;

	if (status == HCHK_STATUS_START) {
		check->result = CHK_RES_UNKNOWN;	/* no result yet */
		check->desc[0] = '\0';
		check->start = now;
		return;
	}

	if (!check->status)
		return;

	if (desc && *desc) {
		strncpy(check->desc, desc, HCHK_DESC_LEN-1);
		check->desc[HCHK_DESC_LEN-1] = '\0';
	} else
		check->desc[0] = '\0';

	check->status = status;
	if (check_statuses[status].result)
		check->result = check_statuses[status].result;

	if (status == HCHK_STATUS_HANA)
		check->duration = -1;
	else if (!tv_iszero(&check->start)) {
		/* set_server_check_status() may be called more than once */
		check->duration = tv_ms_elapsed(&check->start, &now);
		tv_zero(&check->start);
	}

	/* no change is expected if no state change occurred */
	if (check->result == CHK_RES_NEUTRAL)
		return;

	/* If the check was really just sending a mail, it won't have an
	 * associated server, so we're done now.
	 */
	if (!s)
	    return;
	report = 0;

	switch (check->result) {
	case CHK_RES_FAILED:
		/* Failure to connect to the agent as a secondary check should not
		 * cause the server to be marked down.
		 */
		if ((!(check->state & CHK_ST_AGENT) ||
		    (check->status >= HCHK_STATUS_L57DATA)) &&
		    (check->health > 0)) {
			_HA_ATOMIC_ADD(&s->counters.failed_checks, 1);
			report = 1;
			check->health--;
			if (check->health < check->rise)
				check->health = 0;
		}
		break;

	case CHK_RES_PASSED:
	case CHK_RES_CONDPASS:	/* "condpass" cannot make the first step but it OK after a "passed" */
		if ((check->health < check->rise + check->fall - 1) &&
		    (check->result == CHK_RES_PASSED || check->health > 0)) {
			report = 1;
			check->health++;

			if (check->health >= check->rise)
				check->health = check->rise + check->fall - 1; /* OK now */
		}

		/* clear consecutive_errors if observing is enabled */
		if (s->onerror)
			s->consecutive_errors = 0;
		break;

	default:
		break;
	}

	if (s->proxy->options2 & PR_O2_LOGHCHKS &&
	    (status != prev_status || report)) {
		chunk_printf(&trash,
		             "%s check for %sserver %s/%s %s%s",
			     (check->state & CHK_ST_AGENT) ? "Agent" : "Health",
		             s->flags & SRV_F_BACKUP ? "backup " : "",
		             s->proxy->id, s->id,
		             (check->result == CHK_RES_CONDPASS) ? "conditionally ":"",
		             (check->result >= CHK_RES_PASSED)   ? "succeeded" : "failed");

		srv_append_status(&trash, s, check, -1, 0);

		chunk_appendf(&trash, ", status: %d/%d %s",
		             (check->health >= check->rise) ? check->health - check->rise + 1 : check->health,
		             (check->health >= check->rise) ? check->fall : check->rise,
			     (check->health >= check->rise) ? (s->uweight ? "UP" : "DRAIN") : "DOWN");

		ha_warning("%s.\n", trash.area);
		send_log(s->proxy, LOG_NOTICE, "%s.\n", trash.area);
		send_email_alert(s, LOG_INFO, "%s", trash.area);
	}
}

/* Marks the check <check>'s server down if the current check is already failed
 * and the server is not down yet nor in maintenance.
 */
static void check_notify_failure(struct check *check)
{
	struct server *s = check->server;

	/* The agent secondary check should only cause a server to be marked
	 * as down if check->status is HCHK_STATUS_L7STS, which indicates
	 * that the agent returned "fail", "stopped" or "down".
	 * The implication here is that failure to connect to the agent
	 * as a secondary check should not cause the server to be marked
	 * down. */
	if ((check->state & CHK_ST_AGENT) && check->status != HCHK_STATUS_L7STS)
		return;

	if (check->health > 0)
		return;

	/* We only report a reason for the check if we did not do so previously */
	srv_set_stopped(s, NULL, (!s->track && !(s->proxy->options2 & PR_O2_LOGHCHKS)) ? check : NULL);
}

/* Marks the check <check> as valid and tries to set its server up, provided
 * it isn't in maintenance, it is not tracking a down server and other checks
 * comply. The rule is simple : by default, a server is up, unless any of the
 * following conditions is true :
 *   - health check failed (check->health < rise)
 *   - agent check failed (agent->health < rise)
 *   - the server tracks a down server (track && track->state == STOPPED)
 * Note that if the server has a slowstart, it will switch to STARTING instead
 * of RUNNING. Also, only the health checks support the nolb mode, so the
 * agent's success may not take the server out of this mode.
 */
static void check_notify_success(struct check *check)
{
	struct server *s = check->server;

	if (s->next_admin & SRV_ADMF_MAINT)
		return;

	if (s->track && s->track->next_state == SRV_ST_STOPPED)
		return;

	if ((s->check.state & CHK_ST_ENABLED) && (s->check.health < s->check.rise))
		return;

	if ((s->agent.state & CHK_ST_ENABLED) && (s->agent.health < s->agent.rise))
		return;

	if ((check->state & CHK_ST_AGENT) && s->next_state == SRV_ST_STOPPING)
		return;

	srv_set_running(s, NULL, (!s->track && !(s->proxy->options2 & PR_O2_LOGHCHKS)) ? check : NULL);
}

/* Marks the check <check> as valid and tries to set its server into stopping mode
 * if it was running or starting, and provided it isn't in maintenance and other
 * checks comply. The conditions for the server to be marked in stopping mode are
 * the same as for it to be turned up. Also, only the health checks support the
 * nolb mode.
 */
static void check_notify_stopping(struct check *check)
{
	struct server *s = check->server;

	if (s->next_admin & SRV_ADMF_MAINT)
		return;

	if (check->state & CHK_ST_AGENT)
		return;

	if (s->track && s->track->next_state == SRV_ST_STOPPED)
		return;

	if ((s->check.state & CHK_ST_ENABLED) && (s->check.health < s->check.rise))
		return;

	if ((s->agent.state & CHK_ST_ENABLED) && (s->agent.health < s->agent.rise))
		return;

	srv_set_stopping(s, NULL, (!s->track && !(s->proxy->options2 & PR_O2_LOGHCHKS)) ? check : NULL);
}

/* note: use health_adjust() only, which first checks that the observe mode is
 * enabled.
 */
void __health_adjust(struct server *s, short status)
{
	int failed;
	int expire;

	if (s->observe >= HANA_OBS_SIZE)
		return;

	if (status >= HANA_STATUS_SIZE || !analyze_statuses[status].desc)
		return;

	switch (analyze_statuses[status].lr[s->observe - 1]) {
		case 1:
			failed = 1;
			break;

		case 2:
			failed = 0;
			break;

		default:
			return;
	}

	if (!failed) {
		/* good: clear consecutive_errors */
		s->consecutive_errors = 0;
		return;
	}

	_HA_ATOMIC_ADD(&s->consecutive_errors, 1);

	if (s->consecutive_errors < s->consecutive_errors_limit)
		return;

	chunk_printf(&trash, "Detected %d consecutive errors, last one was: %s",
	             s->consecutive_errors, get_analyze_status(status));

	switch (s->onerror) {
		case HANA_ONERR_FASTINTER:
		/* force fastinter - nothing to do here as all modes force it */
			break;

		case HANA_ONERR_SUDDTH:
		/* simulate a pre-fatal failed health check */
			if (s->check.health > s->check.rise)
				s->check.health = s->check.rise + 1;

			/* no break - fall through */

		case HANA_ONERR_FAILCHK:
		/* simulate a failed health check */
			set_server_check_status(&s->check, HCHK_STATUS_HANA,
						trash.area);
			check_notify_failure(&s->check);
			break;

		case HANA_ONERR_MARKDWN:
		/* mark server down */
			s->check.health = s->check.rise;
			set_server_check_status(&s->check, HCHK_STATUS_HANA,
						trash.area);
			check_notify_failure(&s->check);
			break;

		default:
			/* write a warning? */
			break;
	}

	s->consecutive_errors = 0;
	_HA_ATOMIC_ADD(&s->counters.failed_hana, 1);

	if (s->check.fastinter) {
		expire = tick_add(now_ms, MS_TO_TICKS(s->check.fastinter));
		if (s->check.task->expire > expire) {
			s->check.task->expire = expire;
			/* requeue check task with new expire */
			task_queue(s->check.task);
		}
	}
}

/* Checks the connection. If an error has already been reported or the socket is
 * closed, keep errno intact as it is supposed to contain the valid error code.
 * If no error is reported, check the socket's error queue using getsockopt().
 * Warning, this must be done only once when returning from poll, and never
 * after an I/O error was attempted, otherwise the error queue might contain
 * inconsistent errors. If an error is detected, the CO_FL_ERROR is set on the
 * socket. Returns non-zero if an error was reported, zero if everything is
 * clean (including a properly closed socket).
 */
static int retrieve_errno_from_socket(struct connection *conn)
{
	int skerr;
	socklen_t lskerr = sizeof(skerr);

	if (conn->flags & CO_FL_ERROR && (unclean_errno(errno) || !conn->ctrl))
		return 1;

	if (!conn_ctrl_ready(conn))
		return 0;

	if (getsockopt(conn->handle.fd, SOL_SOCKET, SO_ERROR, &skerr, &lskerr) == 0)
		errno = skerr;

	errno = unclean_errno(errno);

	if (!errno) {
		/* we could not retrieve an error, that does not mean there is
		 * none. Just don't change anything and only report the prior
		 * error if any.
		 */
		if (conn->flags & CO_FL_ERROR)
			return 1;
		else
			return 0;
	}

	conn->flags |= CO_FL_ERROR | CO_FL_SOCK_WR_SH | CO_FL_SOCK_RD_SH;
	return 1;
}

/* Tries to collect as much information as possible on the connection status,
 * and adjust the server status accordingly. It may make use of <errno_bck>
 * if non-null when the caller is absolutely certain of its validity (eg:
 * checked just after a syscall). If the caller doesn't have a valid errno,
 * it can pass zero, and retrieve_errno_from_socket() will be called to try
 * to extract errno from the socket. If no error is reported, it will consider
 * the <expired> flag. This is intended to be used when a connection error was
 * reported in conn->flags or when a timeout was reported in <expired>. The
 * function takes care of not updating a server status which was already set.
 * All situations where at least one of <expired> or CO_FL_ERROR are set
 * produce a status.
 */
static void chk_report_conn_err(struct check *check, int errno_bck, int expired)
{
	struct conn_stream *cs = check->cs;
	struct connection *conn = cs_conn(cs);
	const char *err_msg;
	struct buffer *chk;
	int step;

	if (check->result != CHK_RES_UNKNOWN)
		return;

	errno = unclean_errno(errno_bck);
	if (conn && errno)
		retrieve_errno_from_socket(conn);

	if (conn && !(conn->flags & CO_FL_ERROR) &&
	    !(cs->flags & CS_FL_ERROR) && !expired)
		return;

	/* we'll try to build a meaningful error message depending on the
	 * context of the error possibly present in conn->err_code, and the
	 * socket error possibly collected above. This is useful to know the
	 * exact step of the L6 layer (eg: SSL handshake).
	 */
	chk = get_trash_chunk();

	if (check->type == PR_O2_TCPCHK_CHK &&
	    (check->tcpcheck_rules->flags & TCPCHK_RULES_PROTO_CHK) == TCPCHK_RULES_TCP_CHK) {
		step = tcpcheck_get_step_id(check, NULL);
		if (!step)
			chunk_printf(chk, " at initial connection step of tcp-check");
		else {
			chunk_printf(chk, " at step %d of tcp-check", step);
			/* we were looking for a string */
			if (check->current_step && check->current_step->action == TCPCHK_ACT_CONNECT) {
				if (check->current_step->connect.port)
					chunk_appendf(chk, " (connect port %d)" ,check->current_step->connect.port);
				else
					chunk_appendf(chk, " (connect)");
			}
			else if (check->current_step && check->current_step->action == TCPCHK_ACT_EXPECT) {
				struct tcpcheck_expect *expect = &check->current_step->expect;

				switch (expect->type) {
				case TCPCHK_EXPECT_STRING:
					chunk_appendf(chk, " (expect string '%.*s')", (unsigned int)istlen(expect->data), istptr(expect->data));
					break;
				case TCPCHK_EXPECT_BINARY:
					chunk_appendf(chk, " (expect binary '%.*s')", (unsigned int)istlen(expect->data), istptr(expect->data));
					break;
				case TCPCHK_EXPECT_REGEX:
					chunk_appendf(chk, " (expect regex)");
					break;
				case TCPCHK_EXPECT_REGEX_BINARY:
					chunk_appendf(chk, " (expect binary regex)");
					break;
				case TCPCHK_EXPECT_HTTP_STATUS:
					chunk_appendf(chk, " (expect HTTP status '%.*s')", (unsigned int)istlen(expect->data), istptr(expect->data));
					break;
				case TCPCHK_EXPECT_HTTP_REGEX_STATUS:
					chunk_appendf(chk, " (expect HTTP status regex)");
					break;
				case TCPCHK_EXPECT_HTTP_BODY:
					chunk_appendf(chk, " (expect HTTP body content '%.*s')", (unsigned int)istlen(expect->data), istptr(expect->data));
					break;
				case TCPCHK_EXPECT_HTTP_REGEX_BODY:
					chunk_appendf(chk, " (expect HTTP body regex)");
					break;
				case TCPCHK_EXPECT_CUSTOM:
					chunk_appendf(chk, " (expect custom function)");
					break;
				case TCPCHK_EXPECT_UNDEF:
					chunk_appendf(chk, " (undefined expect!)");
					break;
				}
			}
			else if (check->current_step && check->current_step->action == TCPCHK_ACT_SEND) {
				chunk_appendf(chk, " (send)");
			}

			if (check->current_step && check->current_step->comment)
				chunk_appendf(chk, " comment: '%s'", check->current_step->comment);
		}
	}

	if (conn && conn->err_code) {
		if (unclean_errno(errno))
			chunk_printf(&trash, "%s (%s)%s", conn_err_code_str(conn), strerror(errno),
				     chk->area);
		else
			chunk_printf(&trash, "%s%s", conn_err_code_str(conn),
				     chk->area);
		err_msg = trash.area;
	}
	else {
		if (unclean_errno(errno)) {
			chunk_printf(&trash, "%s%s", strerror(errno),
				     chk->area);
			err_msg = trash.area;
		}
		else {
			err_msg = chk->area;
		}
	}

	if (check->state & CHK_ST_PORT_MISS) {
		/* NOTE: this is reported after <fall> tries */
		chunk_printf(chk, "No port available for the TCP connection");
		set_server_check_status(check, HCHK_STATUS_SOCKERR, err_msg);
	}

	if (!conn) {
		/* connection allocation error before the connection was established */
		set_server_check_status(check, HCHK_STATUS_SOCKERR, err_msg);
	}
	else if (conn->flags & CO_FL_WAIT_L4_CONN) {
		/* L4 not established (yet) */
		if (conn->flags & CO_FL_ERROR || cs->flags & CS_FL_ERROR)
			set_server_check_status(check, HCHK_STATUS_L4CON, err_msg);
		else if (expired)
			set_server_check_status(check, HCHK_STATUS_L4TOUT, err_msg);

		/*
		 * might be due to a server IP change.
		 * Let's trigger a DNS resolution if none are currently running.
		 */
		if (check->server)
			dns_trigger_resolution(check->server->dns_requester);

	}
	else if (conn->flags & CO_FL_WAIT_L6_CONN) {
		/* L6 not established (yet) */
		if (conn->flags & CO_FL_ERROR || cs->flags & CS_FL_ERROR)
			set_server_check_status(check, HCHK_STATUS_L6RSP, err_msg);
		else if (expired)
			set_server_check_status(check, HCHK_STATUS_L6TOUT, err_msg);
	}
	else if (conn->flags & CO_FL_ERROR || cs->flags & CS_FL_ERROR) {
		/* I/O error after connection was established and before we could diagnose */
		set_server_check_status(check, HCHK_STATUS_SOCKERR, err_msg);
	}
	else if (expired) {
		enum healthcheck_status tout = HCHK_STATUS_L7TOUT;

		/* connection established but expired check */
		if (check->current_step && check->current_step->action == TCPCHK_ACT_EXPECT)
			tout = check->current_step->expect.tout_status;
		set_server_check_status(check, tout, err_msg);
	}

	return;
}


/**************************************************************************/
/*************** Init/deinit tcp-check rules and ruleset ******************/
/**************************************************************************/
/* Releases memory allocated for a log-format string */
static void free_tcpcheck_fmt(struct list *fmt)
{
	struct logformat_node *lf, *lfb;

	list_for_each_entry_safe(lf, lfb, fmt, list) {
		LIST_DEL(&lf->list);
		release_sample_expr(lf->expr);
		free(lf->arg);
		free(lf);
	}
}

/* Releases memory allocated for an HTTP header used in a tcp-check send rule */
static void free_tcpcheck_http_hdr(struct tcpcheck_http_hdr *hdr)
{
	if (!hdr)
		return;

	free_tcpcheck_fmt(&hdr->value);
	istfree(&hdr->name);
	free(hdr);
}

/* Releases memory allocated for an HTTP header list used in a tcp-check send
 * rule
 */
static void free_tcpcheck_http_hdrs(struct list *hdrs)
{
	struct tcpcheck_http_hdr *hdr, *bhdr;

	list_for_each_entry_safe(hdr, bhdr, hdrs, list) {
		LIST_DEL(&hdr->list);
		free_tcpcheck_http_hdr(hdr);
	}
}

/* Releases memory allocated for a tcp-check. If in_pool is set, it means the
 * tcp-check was allocated using a memory pool (it is used to instantiate email
 * alerts).
 */
static void free_tcpcheck(struct tcpcheck_rule *rule, int in_pool)
{
	if (!rule)
		return;

	free(rule->comment);
	switch (rule->action) {
	case TCPCHK_ACT_SEND:
		switch (rule->send.type) {
		case TCPCHK_SEND_STRING:
		case TCPCHK_SEND_BINARY:
			istfree(&rule->send.data);
			break;
		case TCPCHK_SEND_STRING_LF:
		case TCPCHK_SEND_BINARY_LF:
			free_tcpcheck_fmt(&rule->send.fmt);
			break;
		case TCPCHK_SEND_HTTP:
			free(rule->send.http.meth.str.area);
			if (!(rule->send.http.flags & TCPCHK_SND_HTTP_FL_URI_FMT))
				istfree(&rule->send.http.uri);
			else
				free_tcpcheck_fmt(&rule->send.http.uri_fmt);
			istfree(&rule->send.http.vsn);
			free_tcpcheck_http_hdrs(&rule->send.http.hdrs);
			if (!(rule->send.http.flags & TCPCHK_SND_HTTP_FL_BODY_FMT))
				istfree(&rule->send.http.body);
			else
				free_tcpcheck_fmt(&rule->send.http.body_fmt);
			break;
		case TCPCHK_SEND_UNDEF:
			break;
		}
		break;
	case TCPCHK_ACT_EXPECT:
		free_tcpcheck_fmt(&rule->expect.onerror_fmt);
		free_tcpcheck_fmt(&rule->expect.onsuccess_fmt);
		release_sample_expr(rule->expect.status_expr);
		switch (rule->expect.type) {
		case TCPCHK_EXPECT_STRING:
		case TCPCHK_EXPECT_BINARY:
		case TCPCHK_EXPECT_HTTP_STATUS:
		case TCPCHK_EXPECT_HTTP_BODY:
			istfree(&rule->expect.data);
			break;
		case TCPCHK_EXPECT_REGEX:
		case TCPCHK_EXPECT_REGEX_BINARY:
		case TCPCHK_EXPECT_HTTP_REGEX_STATUS:
		case TCPCHK_EXPECT_HTTP_REGEX_BODY:
			regex_free(rule->expect.regex);
			break;
		case TCPCHK_EXPECT_CUSTOM:
		case TCPCHK_EXPECT_UNDEF:
			break;
		}
		break;
	case TCPCHK_ACT_CONNECT:
		free(rule->connect.sni);
		free(rule->connect.alpn);
		release_sample_expr(rule->connect.port_expr);
		break;
	case TCPCHK_ACT_COMMENT:
		break;
	case TCPCHK_ACT_ACTION_KW:
		free(rule->action_kw.rule);
		break;
	}

	if (in_pool)
		pool_free(pool_head_tcpcheck_rule, rule);
	else
		free(rule);
}

/* Creates a tcp-check variable used in preset variables before executing a
 * tcp-check ruleset.
 */
static struct tcpcheck_var *create_tcpcheck_var(const struct ist name)
{
	struct tcpcheck_var *var = NULL;

	var = calloc(1, sizeof(*var));
	if (var == NULL)
		return NULL;

	var->name = istdup(name);
	if (!isttest(var->name)) {
		free(var);
		return NULL;
	}

	LIST_INIT(&var->list);
	return var;
}

/* Releases memory allocated for a preset tcp-check variable */
static void free_tcpcheck_var(struct tcpcheck_var *var)
{
	if (!var)
		return;

	istfree(&var->name);
	if (var->data.type == SMP_T_STR || var->data.type == SMP_T_BIN)
		free(var->data.u.str.area);
	else if (var->data.type == SMP_T_METH && var->data.u.meth.meth == HTTP_METH_OTHER)
		free(var->data.u.meth.str.area);
	free(var);
}

/* Releases a list of preset tcp-check variables */
static void free_tcpcheck_vars(struct list *vars)
{
	struct tcpcheck_var *var, *back;

	list_for_each_entry_safe(var, back, vars, list) {
		LIST_DEL(&var->list);
		free_tcpcheck_var(var);
	}
}

/* Duplicate a list of preset tcp-check variables */
int dup_tcpcheck_vars(struct list *dst, struct list *src)
{
	struct tcpcheck_var *var, *new = NULL;

	list_for_each_entry(var, src, list) {
		new = create_tcpcheck_var(var->name);
		if (!new)
			goto error;
		new->data.type = var->data.type;
		if (var->data.type == SMP_T_STR || var->data.type == SMP_T_BIN) {
			if (chunk_dup(&new->data.u.str, &var->data.u.str) == NULL)
				goto error;
			if (var->data.type == SMP_T_STR)
				new->data.u.str.area[new->data.u.str.data] = 0;
		}
		else if (var->data.type == SMP_T_METH && var->data.u.meth.meth == HTTP_METH_OTHER) {
			if (chunk_dup(&new->data.u.str, &var->data.u.str) == NULL)
				goto error;
			new->data.u.str.area[new->data.u.str.data] = 0;
			new->data.u.meth.meth = var->data.u.meth.meth;
		}
		else
			new->data.u = var->data.u;
		LIST_ADDQ(dst, &new->list);
	}
	return 1;

 error:
	free(new);
	return 0;
}

/* Looks for a shared tcp-check ruleset given its name. */
static struct tcpcheck_ruleset *find_tcpcheck_ruleset(const char *name)
{
	struct tcpcheck_ruleset *rs;
	struct ebpt_node *node;

	node = ebis_lookup_len(&shared_tcpchecks, name, strlen(name));
	if (node) {
		rs = container_of(node, typeof(*rs), node);
		return rs;
	}
	return NULL;
}

/* Creates a new shared tcp-check ruleset  */
static struct tcpcheck_ruleset *create_tcpcheck_ruleset(const char *name)
{
	struct tcpcheck_ruleset *rs;

	rs = calloc(1, sizeof(*rs));
	if (rs == NULL)
		return NULL;

	rs->node.key = strdup(name);
	if (rs->node.key == NULL) {
		free(rs);
		return NULL;
	}

	LIST_INIT(&rs->rules);
	ebis_insert(&shared_tcpchecks, &rs->node);
	return rs;
}

/* Releases memory allocated by a tcp-check ruleset. */
static void free_tcpcheck_ruleset(struct tcpcheck_ruleset *rs)
{
	struct tcpcheck_rule *r, *rb;
	if (!rs)
		return;

	ebpt_delete(&rs->node);
	free(rs->node.key);
	list_for_each_entry_safe(r, rb, &rs->rules, list) {
		LIST_DEL(&r->list);
		free_tcpcheck(r, 0);
	}
	free(rs);
}


/**************************************************************************/
/**************** Everything about tcp-checks execution *******************/
/**************************************************************************/
/* Returns the id of a step in a tcp-check ruleset */
static int tcpcheck_get_step_id(struct check *check, struct tcpcheck_rule *rule)
{
	if (!rule)
		rule = check->current_step;

	/* no last started step => first step */
	if (!rule)
		return 1;

	/* last step is the first implicit connect */
	if (rule->index == 0 &&
	    rule->action == TCPCHK_ACT_CONNECT &&
	    (rule->connect.options & TCPCHK_OPT_IMPLICIT))
		return 0;

	return rule->index + 1;
}

/* Returns the first non COMMENT/ACTION_KW tcp-check rule from list <list> or
 * NULL if none was found.
 */
static struct tcpcheck_rule *get_first_tcpcheck_rule(struct tcpcheck_rules *rules)
{
	struct tcpcheck_rule *r;

	list_for_each_entry(r, rules->list, list) {
		if (r->action != TCPCHK_ACT_COMMENT && r->action != TCPCHK_ACT_ACTION_KW)
			return r;
	}
	return NULL;
}

/* Returns the last non COMMENT/ACTION_KW tcp-check rule from list <list> or
 * NULL if none was found.
 */
static struct tcpcheck_rule *get_last_tcpcheck_rule(struct tcpcheck_rules *rules)
{
	struct tcpcheck_rule *r;

	list_for_each_entry_rev(r, rules->list, list) {
		if (r->action != TCPCHK_ACT_COMMENT && r->action != TCPCHK_ACT_ACTION_KW)
			return r;
	}
	return NULL;
}

/* Returns the non COMMENT/ACTION_KW tcp-check rule from list <list> following
 * <start> or NULL if non was found. If <start> is NULL, it relies on
 * get_first_tcpcheck_rule().
 */
static struct tcpcheck_rule *get_next_tcpcheck_rule(struct tcpcheck_rules *rules, struct tcpcheck_rule *start)
{
	struct tcpcheck_rule *r;

	if (!start)
		return get_first_tcpcheck_rule(rules);

	r = LIST_NEXT(&start->list, typeof(r), list);
	list_for_each_entry_from(r, rules->list, list) {
		if (r->action != TCPCHK_ACT_COMMENT && r->action != TCPCHK_ACT_ACTION_KW)
			return r;
	}
	return NULL;
}


/* Creates info message when a tcp-check healthcheck fails on an expect rule */
static void tcpcheck_expect_onerror_message(struct buffer *msg, struct check *check, struct tcpcheck_rule *rule,
					    int match, struct ist info)
{
	struct sample *smp;

	/* Follows these step to produce the info message:
	 *     1. if info field is already provided, copy it
	 *     2. if the expect rule provides an onerror log-format string,
	 *        use it to produce the message
	 *     3. the expect rule is part of a protcol check (http, redis, mysql...), do nothing
	 *     4. Otherwise produce the generic tcp-check info message
	 */
	if (istlen(info)) {
		chunk_strncat(msg, istptr(info), istlen(info));
		goto comment;
	}
	else if (!LIST_ISEMPTY(&rule->expect.onerror_fmt)) {
		msg->data += sess_build_logline(check->sess, NULL, b_tail(msg), b_room(msg), &rule->expect.onerror_fmt);
		goto comment;
	}

       if (check->type == PR_O2_TCPCHK_CHK &&
	   (check->tcpcheck_rules->flags & TCPCHK_RULES_PROTO_CHK) != TCPCHK_RULES_TCP_CHK)
	       goto comment;

	chunk_strcat(msg, (match ? "TCPCHK matched unwanted content" : "TCPCHK did not match content"));
	switch (rule->expect.type) {
	case TCPCHK_EXPECT_STRING:
	case TCPCHK_EXPECT_HTTP_STATUS:
	case TCPCHK_EXPECT_HTTP_BODY:
		chunk_appendf(msg, " '%.*s' at step %d", (unsigned int)istlen(rule->expect.data), istptr(rule->expect.data),
			      tcpcheck_get_step_id(check, rule));
		break;
	case TCPCHK_EXPECT_BINARY:
		chunk_appendf(msg, " (binary) at step %d", tcpcheck_get_step_id(check, rule));
		break;
	case TCPCHK_EXPECT_REGEX:
	case TCPCHK_EXPECT_HTTP_REGEX_STATUS:
	case TCPCHK_EXPECT_HTTP_REGEX_BODY:
		chunk_appendf(msg, " (regex) at step %d", tcpcheck_get_step_id(check, rule));
		break;
	case TCPCHK_EXPECT_REGEX_BINARY:
		chunk_appendf(msg, " (binary regex) at step %d", tcpcheck_get_step_id(check, rule));
		break;
	case TCPCHK_EXPECT_CUSTOM:
		chunk_appendf(msg, " (custom function) at step %d", tcpcheck_get_step_id(check, rule));
		break;
	case TCPCHK_EXPECT_UNDEF:
		/* Should never happen. */
		return;
	}

  comment:
	/* If the failing expect rule provides a comment, it is concatenated to
	 * the info message.
	 */
	if (rule->comment) {
		chunk_strcat(msg, " comment: ");
		chunk_strcat(msg, rule->comment);
	}

	/* Finally, the check status code is set if the failing expect rule
	 * defines a status expression.
	 */
	if (rule->expect.status_expr) {
		smp = sample_fetch_as_type(check->proxy, check->sess, NULL, SMP_OPT_DIR_RES | SMP_OPT_FINAL,
					   rule->expect.status_expr, SMP_T_SINT);
		if (smp)
			check->code = smp->data.u.sint;
	}

	*(b_tail(msg)) = '\0';
}

/* Creates info message when a tcp-check healthcheck succeeds on an expect rule */
static void tcpcheck_expect_onsuccess_message(struct buffer *msg, struct check *check, struct tcpcheck_rule *rule,
					      struct ist info)
{
	struct sample *smp;

	/* Follows these step to produce the info message:
	 *     1. if info field is already provided, copy it
	 *     2. if the expect rule provides an onsucces log-format string,
	 *        use it to produce the message
	 *     3. the expect rule is part of a protcol check (http, redis, mysql...), do nothing
	 *     4. Otherwise produce the generic tcp-check info message
	 */
	if (istlen(info))
		chunk_strncat(msg, istptr(info), istlen(info));
	if (!LIST_ISEMPTY(&rule->expect.onsuccess_fmt))
		msg->data += sess_build_logline(check->sess, NULL, b_tail(msg), b_room(msg),
						&rule->expect.onsuccess_fmt);
	else if (check->type == PR_O2_TCPCHK_CHK &&
		 (check->tcpcheck_rules->flags & TCPCHK_RULES_PROTO_CHK) == TCPCHK_RULES_TCP_CHK)
		chunk_strcat(msg, "(tcp-check)");

	/* Finally, the check status code is set if the expect rule defines a
	 * status expression.
	 */
	if (rule->expect.status_expr) {
		smp = sample_fetch_as_type(check->proxy, check->sess, NULL, SMP_OPT_DIR_RES | SMP_OPT_FINAL,
					   rule->expect.status_expr, SMP_T_SINT);
		if (smp)
			check->code = smp->data.u.sint;
	}

	*(b_tail(msg)) = '\0';
}

/* Builds the server state header used by HTTP health-checks */
static int httpchk_build_status_header(struct server *s, struct buffer *buf)
{
	int sv_state;
	int ratio;
	char addr[46];
	char port[6];
	const char *srv_hlt_st[7] = { "DOWN", "DOWN %d/%d",
				      "UP %d/%d", "UP",
				      "NOLB %d/%d", "NOLB",
				      "no check" };

	if (!(s->check.state & CHK_ST_ENABLED))
		sv_state = 6;
	else if (s->cur_state != SRV_ST_STOPPED) {
		if (s->check.health == s->check.rise + s->check.fall - 1)
			sv_state = 3; /* UP */
		else
			sv_state = 2; /* going down */

		if (s->cur_state == SRV_ST_STOPPING)
			sv_state += 2;
	} else {
		if (s->check.health)
			sv_state = 1; /* going up */
		else
			sv_state = 0; /* DOWN */
	}

	chunk_appendf(buf, srv_hlt_st[sv_state],
		      (s->cur_state != SRV_ST_STOPPED) ? (s->check.health - s->check.rise + 1) : (s->check.health),
		      (s->cur_state != SRV_ST_STOPPED) ? (s->check.fall) : (s->check.rise));

	addr_to_str(&s->addr, addr, sizeof(addr));
	if (s->addr.ss_family == AF_INET || s->addr.ss_family == AF_INET6)
		snprintf(port, sizeof(port), "%u", s->svc_port);
	else
		*port = 0;

	chunk_appendf(buf, "; address=%s; port=%s; name=%s/%s; node=%s; weight=%d/%d; scur=%d/%d; qcur=%d",
		      addr, port, s->proxy->id, s->id,
		      global.node,
		      (s->cur_eweight * s->proxy->lbprm.wmult + s->proxy->lbprm.wdiv - 1) / s->proxy->lbprm.wdiv,
		      (s->proxy->lbprm.tot_weight * s->proxy->lbprm.wmult + s->proxy->lbprm.wdiv - 1) / s->proxy->lbprm.wdiv,
		      s->cur_sess, s->proxy->beconn - s->proxy->nbpend,
		      s->nbpend);

	if ((s->cur_state == SRV_ST_STARTING) &&
	    now.tv_sec < s->last_change + s->slowstart &&
	    now.tv_sec >= s->last_change) {
		ratio = MAX(1, 100 * (now.tv_sec - s->last_change) / s->slowstart);
		chunk_appendf(buf, "; throttle=%d%%", ratio);
	}

	return b_data(buf);
}

/* Internal functions to parse and validate a MySQL packet in the context of an
 * expect rule. It start to parse the input buffer at the offset <offset>. If
 * <last_read> is set, no more data are expected.
 */
static enum tcpcheck_eval_ret tcpcheck_mysql_expect_packet(struct check *check, struct tcpcheck_rule *rule,
							   unsigned int offset, int last_read)
{
	enum tcpcheck_eval_ret ret = TCPCHK_EVAL_CONTINUE;
	enum healthcheck_status status;
	struct buffer *msg = NULL;
	struct ist desc = IST_NULL;
	unsigned int err = 0, plen = 0;


	/* 3 Bytes for the packet length and 1 byte for the sequence id */
	if (!last_read && b_data(&check->bi) < offset+4) {
		if (!last_read)
			goto wait_more_data;

		/* invalid length or truncated response */
		status = HCHK_STATUS_L7RSP;
		goto error;
	}

	plen = ((unsigned char) *b_peek(&check->bi, offset)) +
		(((unsigned char) *(b_peek(&check->bi, offset+1))) << 8) +
		(((unsigned char) *(b_peek(&check->bi, offset+2))) << 16);

	if (b_data(&check->bi) < offset+plen+4) {
		if (!last_read)
			goto wait_more_data;

		/* invalid length or truncated response */
		status = HCHK_STATUS_L7RSP;
		goto error;
	}

	if (*b_peek(&check->bi, offset+4) == '\xff') {
		/* MySQL Error packet always begin with field_count = 0xff */
		status = HCHK_STATUS_L7STS;
		err = ((unsigned char) *b_peek(&check->bi, offset+5)) +
			(((unsigned char) *(b_peek(&check->bi, offset+6))) << 8);
		desc = ist2(b_peek(&check->bi, offset+7), b_data(&check->bi) - offset - 7);
		goto error;
	}

	if (get_next_tcpcheck_rule(check->tcpcheck_rules, rule) != NULL) {
		/* Not the last rule, continue */
		goto out;
	}

	/* We set the MySQL Version in description for information purpose
	 * FIXME : it can be cool to use MySQL Version for other purpose,
	 * like mark as down old MySQL server.
	 */
	set_server_check_status(check, rule->expect.ok_status, b_peek(&check->bi, 5));

  out:
	free_trash_chunk(msg);
	return ret;

  error:
	ret = TCPCHK_EVAL_STOP;
	check->code = err;
	msg = alloc_trash_chunk();
	if (msg)
		tcpcheck_expect_onerror_message(msg, check, rule, 0, desc);
	set_server_check_status(check, status, (msg ? b_head(msg) : NULL));
	goto out;

  wait_more_data:
	ret = TCPCHK_EVAL_WAIT;
	goto out;
}

/* Custom tcp-check expect function to parse and validate the MySQL initial
 * handshake packet. Returns TCPCHK_EVAL_WAIT to wait for more data,
 * TCPCHK_EVAL_CONTINUE to evaluate the next rule or TCPCHK_EVAL_STOP if an
 * error occurred.
 */
static enum tcpcheck_eval_ret tcpcheck_mysql_expect_iniths(struct check *check, struct tcpcheck_rule *rule, int last_read)
{
	return tcpcheck_mysql_expect_packet(check, rule, 0, last_read);
}

/* Custom tcp-check expect function to parse and validate the MySQL OK packet
 * following the initial handshake. Returns TCPCHK_EVAL_WAIT to wait for more
 * data, TCPCHK_EVAL_CONTINUE to evaluate the next rule or TCPCHK_EVAL_STOP if
 * an error occurred.
 */
static enum tcpcheck_eval_ret tcpcheck_mysql_expect_ok(struct check *check, struct tcpcheck_rule *rule, int last_read)
{
	unsigned int hslen = 0;

	hslen = 4 + ((unsigned char) *b_head(&check->bi)) +
		(((unsigned char) *(b_peek(&check->bi, 1))) << 8) +
		(((unsigned char) *(b_peek(&check->bi, 2))) << 16);

	return tcpcheck_mysql_expect_packet(check, rule, hslen, last_read);
}

/* Custom tcp-check expect function to parse and validate the LDAP bind response
 * package packet. Returns TCPCHK_EVAL_WAIT to wait for more data,
 * TCPCHK_EVAL_CONTINUE to evaluate the next rule or TCPCHK_EVAL_STOP if an
 * error occurred.
 */
static enum tcpcheck_eval_ret tcpcheck_ldap_expect_bindrsp(struct check *check, struct tcpcheck_rule *rule, int last_read)
{
	enum tcpcheck_eval_ret ret = TCPCHK_EVAL_CONTINUE;
	enum healthcheck_status status;
	struct buffer *msg = NULL;
	struct ist desc = IST_NULL;
	unsigned short msglen = 0;

	/* Check if the server speaks LDAP (ASN.1/BER)
	 * http://en.wikipedia.org/wiki/Basic_Encoding_Rules
	 * http://tools.ietf.org/html/rfc4511
	 */
	/* size of LDAPMessage */
	msglen = (*(b_head(&check->bi) + 1) & 0x80) ? (*(b_head(&check->bi) + 1) & 0x7f) : 0;

	/* http://tools.ietf.org/html/rfc4511#section-4.2.2
	 *   messageID: 0x02 0x01 0x01: INTEGER 1
	 *   protocolOp: 0x61: bindResponse
	 */
	if ((msglen > 2) || (memcmp(b_head(&check->bi) + 2 + msglen, "\x02\x01\x01\x61", 4) != 0)) {
		status = HCHK_STATUS_L7RSP;
		desc = ist("Not LDAPv3 protocol");
		goto error;
	}

	/* size of bindResponse */
	msglen += (*(b_head(&check->bi) + msglen + 6) & 0x80) ? (*(b_head(&check->bi) + msglen + 6) & 0x7f) : 0;

	/* http://tools.ietf.org/html/rfc4511#section-4.1.9
	 *   ldapResult: 0x0a 0x01: ENUMERATION
	 */
	if ((msglen > 4) || (memcmp(b_head(&check->bi) + 7 + msglen, "\x0a\x01", 2) != 0)) {
		status = HCHK_STATUS_L7RSP;
		desc = ist("Not LDAPv3 protocol");
		goto error;
	}

	/* http://tools.ietf.org/html/rfc4511#section-4.1.9
	 *   resultCode
	 */
	check->code = *(b_head(&check->bi) + msglen + 9);
	if (check->code) {
		status = HCHK_STATUS_L7STS;
		desc = ist("See RFC: http://tools.ietf.org/html/rfc4511#section-4.1.9");
		goto error;
	}

	set_server_check_status(check, rule->expect.ok_status, "Success");

  out:
	free_trash_chunk(msg);
	return ret;

  error:
	ret = TCPCHK_EVAL_STOP;
	msg = alloc_trash_chunk();
	if (msg)
		tcpcheck_expect_onerror_message(msg, check, rule, 0, desc);
	set_server_check_status(check, status, (msg ? b_head(msg) : NULL));
	goto out;

  wait_more_data:
	ret = TCPCHK_EVAL_WAIT;
	goto out;
}

/* Custom tcp-check expect function to parse and validate the SPOP hello agent
 * frame. Returns TCPCHK_EVAL_WAIT to wait for more data, TCPCHK_EVAL_CONTINUE
 * to evaluate the next rule or TCPCHK_EVAL_STOP if an error occurred.
 */
static enum tcpcheck_eval_ret tcpcheck_spop_expect_agenthello(struct check *check, struct tcpcheck_rule *rule, int last_read)
{
	enum tcpcheck_eval_ret ret = TCPCHK_EVAL_CONTINUE;
	enum healthcheck_status status;
	struct buffer *msg = NULL;
	struct ist desc = IST_NULL;
	unsigned int framesz;


	memcpy(&framesz, b_head(&check->bi), 4);
	framesz = ntohl(framesz);

	if (!last_read && b_data(&check->bi) < (4+framesz))
		goto wait_more_data;

	memset(b_orig(&trash), 0, b_size(&trash));
	if (spoe_handle_healthcheck_response(b_peek(&check->bi, 4), framesz, b_orig(&trash), HCHK_DESC_LEN) == -1) {
		status = HCHK_STATUS_L7RSP;
		desc = ist2(b_orig(&trash), strlen(b_orig(&trash)));
		goto error;
	}

	set_server_check_status(check, rule->expect.ok_status, "SPOA server is ok");

  out:
	free_trash_chunk(msg);
	return ret;

  error:
	ret = TCPCHK_EVAL_STOP;
	msg = alloc_trash_chunk();
	if (msg)
		tcpcheck_expect_onerror_message(msg, check, rule, 0, desc);
	set_server_check_status(check, status, (msg ? b_head(msg) : NULL));
	goto out;

  wait_more_data:
	ret = TCPCHK_EVAL_WAIT;
	goto out;
}

/* Custom tcp-check expect function to parse and validate the agent-check
 * reply. Returns TCPCHK_EVAL_WAIT to wait for more data, TCPCHK_EVAL_CONTINUE
 * to evaluate the next rule or TCPCHK_EVAL_STOP if an error occurred.
 */
static enum tcpcheck_eval_ret tcpcheck_agent_expect_reply(struct check *check, struct tcpcheck_rule *rule, int last_read)
{
	enum tcpcheck_eval_ret ret = TCPCHK_EVAL_STOP;
	enum healthcheck_status status = HCHK_STATUS_CHECKED;
	const char *hs = NULL; /* health status      */
	const char *as = NULL; /* admin status */
	const char *ps = NULL; /* performance status */
	const char *cs = NULL; /* maxconn */
	const char *err = NULL; /* first error to report */
	const char *wrn = NULL; /* first warning to report */
	char *cmd, *p;

	/* We're getting an agent check response. The agent could
	 * have been disabled in the mean time with a long check
	 * still pending. It is important that we ignore the whole
	 * response.
	 */
	if (!(check->state & CHK_ST_ENABLED))
		goto out;

	/* The agent supports strings made of a single line ended by the
	 * first CR ('\r') or LF ('\n'). This line is composed of words
	 * delimited by spaces (' '), tabs ('\t'), or commas (','). The
	 * line may optionally contained a description of a state change
	 * after a sharp ('#'), which is only considered if a health state
	 * is announced.
	 *
	 * Words may be composed of :
	 *   - a numeric weight suffixed by the percent character ('%').
	 *   - a health status among "up", "down", "stopped", and "fail".
	 *   - an admin status among "ready", "drain", "maint".
	 *
	 * These words may appear in any order. If multiple words of the
	 * same category appear, the last one wins.
	 */

	p = b_head(&check->bi);
	while (*p && *p != '\n' && *p != '\r')
		p++;

	if (!*p) {
		if (!last_read)
			goto wait_more_data;

		/* at least inform the admin that the agent is mis-behaving */
		set_server_check_status(check, check->status, "Ignoring incomplete line from agent");
		goto out;
	}

	*p = 0;
	cmd = b_head(&check->bi);

	while (*cmd) {
		/* look for next word */
		if (*cmd == ' ' || *cmd == '\t' || *cmd == ',') {
			cmd++;
			continue;
		}

		if (*cmd == '#') {
			/* this is the beginning of a health status description,
			 * skip the sharp and blanks.
			 */
			cmd++;
			while (*cmd == '\t' || *cmd == ' ')
				cmd++;
			break;
		}

		/* find the end of the word so that we have a null-terminated
		 * word between <cmd> and <p>.
		 */
		p = cmd + 1;
		while (*p && *p != '\t' && *p != ' ' && *p != '\n' && *p != ',')
			p++;
		if (*p)
			*p++ = 0;

		/* first, health statuses */
		if (strcasecmp(cmd, "up") == 0) {
			check->server->check.health = check->server->check.rise + check->server->check.fall - 1;
			status = HCHK_STATUS_L7OKD;
			hs = cmd;
		}
		else if (strcasecmp(cmd, "down") == 0) {
			check->server->check.health = 0;
			status = HCHK_STATUS_L7STS;
			hs = cmd;
		}
		else if (strcasecmp(cmd, "stopped") == 0) {
			check->server->check.health = 0;
			status = HCHK_STATUS_L7STS;
			hs = cmd;
		}
		else if (strcasecmp(cmd, "fail") == 0) {
			check->server->check.health = 0;
			status = HCHK_STATUS_L7STS;
			hs = cmd;
		}
		/* admin statuses */
		else if (strcasecmp(cmd, "ready") == 0) {
			as = cmd;
		}
		else if (strcasecmp(cmd, "drain") == 0) {
			as = cmd;
		}
		else if (strcasecmp(cmd, "maint") == 0) {
			as = cmd;
		}
		/* try to parse a weight here and keep the last one */
		else if (isdigit((unsigned char)*cmd) && strchr(cmd, '%') != NULL) {
			ps = cmd;
		}
		/* try to parse a maxconn here */
		else if (strncasecmp(cmd, "maxconn:", strlen("maxconn:")) == 0) {
			cs = cmd;
		}
		else {
			/* keep a copy of the first error */
			if (!err)
				err = cmd;
		}
		/* skip to next word */
		cmd = p;
	}
	/* here, cmd points either to \0 or to the beginning of a
	 * description. Skip possible leading spaces.
	 */
	while (*cmd == ' ' || *cmd == '\n')
		cmd++;

	/* First, update the admin status so that we avoid sending other
	 * possibly useless warnings and can also update the health if
	 * present after going back up.
	 */
	if (as) {
		if (strcasecmp(as, "drain") == 0)
			srv_adm_set_drain(check->server);
		else if (strcasecmp(as, "maint") == 0)
			srv_adm_set_maint(check->server);
		else
			srv_adm_set_ready(check->server);
	}

	/* now change weights */
	if (ps) {
		const char *msg;

		msg = server_parse_weight_change_request(check->server, ps);
		if (!wrn || !*wrn)
			wrn = msg;
	}

	if (cs) {
		const char *msg;

		cs += strlen("maxconn:");

		msg = server_parse_maxconn_change_request(check->server, cs);
		if (!wrn || !*wrn)
			wrn = msg;
	}

	/* and finally health status */
	if (hs) {
		/* We'll report some of the warnings and errors we have
		 * here. Down reports are critical, we leave them untouched.
		 * Lack of report, or report of 'UP' leaves the room for
		 * ERR first, then WARN.
		 */
		const char *msg = cmd;
		struct buffer *t;

		if (!*msg || status == HCHK_STATUS_L7OKD) {
			if (err && *err)
				msg = err;
			else if (wrn && *wrn)
				msg = wrn;
		}

		t = get_trash_chunk();
		chunk_printf(t, "via agent : %s%s%s%s",
			     hs, *msg ? " (" : "",
			     msg, *msg ? ")" : "");
		set_server_check_status(check, status, t->area);
	}
	else if (err && *err) {
		/* No status change but we'd like to report something odd.
		 * Just report the current state and copy the message.
		 */
		chunk_printf(&trash, "agent reports an error : %s", err);
		set_server_check_status(check, status/*check->status*/, trash.area);
	}
	else if (wrn && *wrn) {
		/* No status change but we'd like to report something odd.
		 * Just report the current state and copy the message.
		 */
		chunk_printf(&trash, "agent warns : %s", wrn);
		set_server_check_status(check, status/*check->status*/, trash.area);
	}
	else
		set_server_check_status(check, status, NULL);

  out:
	return ret;

  wait_more_data:
	ret = TCPCHK_EVAL_WAIT;
	goto out;
}

/* Evaluates a TCPCHK_ACT_CONNECT rule. Returns TCPCHK_EVAL_WAIT to wait the
 * connection establishment, TCPCHK_EVAL_CONTINUE to evaluate the next rule or
 * TCPCHK_EVAL_STOP if an error occurred.
 */
static enum tcpcheck_eval_ret tcpcheck_eval_connect(struct check *check, struct tcpcheck_rule *rule)
{
	enum tcpcheck_eval_ret ret = TCPCHK_EVAL_CONTINUE;
	struct tcpcheck_connect *connect = &rule->connect;
	struct proxy *proxy = check->proxy;
	struct server *s = check->server;
	struct task *t = check->task;
	struct conn_stream *cs;
	struct connection *conn = NULL;
	struct protocol *proto;
	struct xprt_ops *xprt;
	int status, port;

	/* For a connect action we'll create a new connection. We may also have
	 * to kill a previous one. But we don't want to leave *without* a
	 * connection if we came here from the connection layer, hence with a
	 * connection.  Thus we'll proceed in the following order :
	 *   1: close but not release previous connection (handled by the caller)
	 *   2: try to get a new connection
	 *   3: release and replace the old one on success
	 */

	/* 2- prepare new connection */
	cs = cs_new(NULL);
	if (!cs) {
		chunk_printf(&trash, "TCPCHK error allocating connection at step %d",
			     tcpcheck_get_step_id(check, rule));
		if (rule->comment)
			chunk_appendf(&trash, " comment: '%s'", rule->comment);
		set_server_check_status(check, HCHK_STATUS_SOCKERR, trash.area);
		ret = TCPCHK_EVAL_STOP;
		goto out;
	}

	/* 3- release and replace the old one on success */
	if (check->cs) {
		if (check->wait_list.events)
			cs->conn->xprt->unsubscribe(cs->conn, cs->conn->xprt_ctx,
						    check->wait_list.events, &check->wait_list);

		/* We may have been scheduled to run, and the I/O handler
		 * expects to have a cs, so remove the tasklet
		 */
		tasklet_remove_from_tasklet_list(check->wait_list.tasklet);
		cs_destroy(check->cs);
	}

	tasklet_set_tid(check->wait_list.tasklet, tid);

	check->cs = cs;
	conn = cs->conn;
	conn_set_owner(conn, check->sess, NULL);

	/* Maybe there were an older connection we were waiting on */
	check->wait_list.events = 0;
	conn->target = s ? &s->obj_type : &proxy->obj_type;

	/* no client address */
	if (!sockaddr_alloc(&conn->dst)) {
		status = SF_ERR_RESOURCE;
		goto fail_check;
	}

	/* connect to the connect rule addr if specified, otherwise the check
	 * addr if specified on the server. otherwise, use the server addr
	 */
	*conn->dst = (is_addr(&connect->addr)
		      ? connect->addr
		      : (is_addr(&check->addr) ? check->addr : s->addr));
	proto = protocol_by_family(conn->dst->ss_family);

	port = 0;
	if (!port && connect->port)
		port = connect->port;
	if (!port && connect->port_expr) {
		struct sample *smp;

		smp = sample_fetch_as_type(check->proxy, check->sess, NULL,
					   SMP_OPT_DIR_REQ | SMP_OPT_FINAL,
					   connect->port_expr, SMP_T_SINT);
		if (smp)
			port = smp->data.u.sint;
	}
	if (!port && is_inet_addr(&connect->addr))
		port = get_host_port(&connect->addr);
	if (!port && check->port)
		port = check->port;
	if (!port && is_inet_addr(&check->addr))
		port = get_host_port(&check->addr);
	if (!port)
		port = s->svc_port;
	set_host_port(conn->dst, port);

	xprt = ((connect->options & TCPCHK_OPT_SSL)
		? xprt_get(XPRT_SSL)
		: ((connect->options & TCPCHK_OPT_DEFAULT_CONNECT) ? check->xprt : xprt_get(XPRT_RAW)));

	conn_prepare(conn, proto, xprt);
	cs_attach(cs, check, &check_conn_cb);

	status = SF_ERR_INTERNAL;
	if (proto && proto->connect) {
		struct tcpcheck_rule *next;
		int flags = 0;

		if (check->tcpcheck_rules->flags & TCPCHK_RULES_PROTO_CHK)
			flags |= CONNECT_HAS_DATA;

		next = get_next_tcpcheck_rule(check->tcpcheck_rules, rule);
		if (!next || next->action != TCPCHK_ACT_EXPECT)
			flags |= CONNECT_DELACK_ALWAYS;
		status = proto->connect(conn, flags);
	}

	if (status != SF_ERR_NONE)
		goto fail_check;

	conn->flags |= CO_FL_PRIVATE;
	conn->ctx = cs;

	/* The mux may be initialized now if there isn't server attached to the
	 * check (email alerts) or if there is a mux proto specified or if there
	 * is no alpn.
	 */
	if (!s || ((connect->options & TCPCHK_OPT_DEFAULT_CONNECT) && check->mux_proto) ||
	    connect->mux_proto || (!connect->alpn && !check->alpn_str)) {
		const struct mux_ops *mux_ops;

		if (connect->mux_proto)
			mux_ops = connect->mux_proto->mux;
		else if ((connect->options & TCPCHK_OPT_DEFAULT_CONNECT) && check->mux_proto)
			mux_ops = check->mux_proto->mux;
		else {
			int mode = ((check->tcpcheck_rules->flags & TCPCHK_RULES_PROTO_CHK) == TCPCHK_RULES_HTTP_CHK
				    ? PROTO_MODE_HTTP
				    : PROTO_MODE_TCP);

			mux_ops = conn_get_best_mux(conn, IST_NULL, PROTO_SIDE_BE, mode);
		}
		if (mux_ops && conn_install_mux(conn, mux_ops, cs, proxy, check->sess) < 0) {
			status = SF_ERR_INTERNAL;
			goto fail_check;
		}
	}

#ifdef USE_OPENSSL
	if (connect->sni)
		ssl_sock_set_servername(conn, connect->sni);
	else if ((connect->options & TCPCHK_OPT_DEFAULT_CONNECT) && s->check.sni)
		ssl_sock_set_servername(conn, s->check.sni);

	if (connect->alpn)
		ssl_sock_set_alpn(conn, (unsigned char *)connect->alpn, connect->alpn_len);
	else if ((connect->options & TCPCHK_OPT_DEFAULT_CONNECT) && s->check.alpn_str)
		ssl_sock_set_alpn(conn, (unsigned char *)s->check.alpn_str, s->check.alpn_len);
#endif
	if ((connect->options & TCPCHK_OPT_SOCKS4) && (s->flags & SRV_F_SOCKS4_PROXY)) {
		conn->send_proxy_ofs = 1;
		conn->flags |= CO_FL_SOCKS4;
	}
	else if ((connect->options & TCPCHK_OPT_DEFAULT_CONNECT) && s->check.via_socks4 && (s->flags & SRV_F_SOCKS4_PROXY)) {
		conn->send_proxy_ofs = 1;
		conn->flags |= CO_FL_SOCKS4;
	}

	if (connect->options & TCPCHK_OPT_SEND_PROXY) {
		conn->send_proxy_ofs = 1;
		conn->flags |= CO_FL_SEND_PROXY;
	}
	else if ((connect->options & TCPCHK_OPT_DEFAULT_CONNECT) && s->check.send_proxy && !(check->state & CHK_ST_AGENT)) {
		conn->send_proxy_ofs = 1;
		conn->flags |= CO_FL_SEND_PROXY;
	}

	if (conn_ctrl_ready(conn) && (connect->options & TCPCHK_OPT_LINGER)) {
		/* Some servers don't like reset on close */
		fdtab[cs->conn->handle.fd].linger_risk = 0;
	}

	if (conn_ctrl_ready(conn) && (conn->flags & (CO_FL_SEND_PROXY | CO_FL_SOCKS4))) {
		if (xprt_add_hs(conn) < 0)
			status = SF_ERR_RESOURCE;
	}

  fail_check:
	/* It can return one of :
	 *  - SF_ERR_NONE if everything's OK
	 *  - SF_ERR_SRVTO if there are no more servers
	 *  - SF_ERR_SRVCL if the connection was refused by the server
	 *  - SF_ERR_PRXCOND if the connection has been limited by the proxy (maxconn)
	 *  - SF_ERR_RESOURCE if a system resource is lacking (eg: fd limits, ports, ...)
	 *  - SF_ERR_INTERNAL for any other purely internal errors
	 * Additionally, in the case of SF_ERR_RESOURCE, an emergency log will be emitted.
	 * Note that we try to prevent the network stack from sending the ACK during the
	 * connect() when a pure TCP check is used (without PROXY protocol).
	 */
	switch (status) {
	case SF_ERR_NONE:
		/* we allow up to min(inter, timeout.connect) for a connection
		 * to establish but only when timeout.check is set as it may be
		 * to short for a full check otherwise
		 */
		t->expire = tick_add(now_ms, MS_TO_TICKS(check->inter));

		if (proxy->timeout.check && proxy->timeout.connect) {
			int t_con = tick_add(now_ms, proxy->timeout.connect);
			t->expire = tick_first(t->expire, t_con);
		}
		break;
	case SF_ERR_SRVTO: /* ETIMEDOUT */
	case SF_ERR_SRVCL: /* ECONNREFUSED, ENETUNREACH, ... */
	case SF_ERR_PRXCOND:
	case SF_ERR_RESOURCE:
	case SF_ERR_INTERNAL:
		chk_report_conn_err(check, errno, 0);
		ret = TCPCHK_EVAL_STOP;
		goto out;
	}

	/* don't do anything until the connection is established */
	if (conn->flags & CO_FL_WAIT_XPRT) {
		ret = TCPCHK_EVAL_WAIT;
		goto out;
	}

  out:
	if (conn && check->result == CHK_RES_FAILED)
		conn->flags |= CO_FL_ERROR;
	return ret;
}

/* Evaluates a TCPCHK_ACT_SEND rule. Returns TCPCHK_EVAL_WAIT if outgoing data
 * were not fully sent, TCPCHK_EVAL_CONTINUE to evaluate the next rule or
 * TCPCHK_EVAL_STOP if an error occurred.
 */
static enum tcpcheck_eval_ret tcpcheck_eval_send(struct check *check, struct tcpcheck_rule *rule)
{
	enum tcpcheck_eval_ret ret = TCPCHK_EVAL_CONTINUE;
	struct tcpcheck_send *send = &rule->send;
	struct conn_stream *cs = check->cs;
	struct connection *conn = cs_conn(cs);
	struct buffer *tmp = NULL;
	struct htx *htx = NULL;

	/* reset the read & write buffer */
	b_reset(&check->bi);
	b_reset(&check->bo);

	switch (send->type) {
	case TCPCHK_SEND_STRING:
	case TCPCHK_SEND_BINARY:
		if (istlen(send->data) >= b_size(&check->bo)) {
			chunk_printf(&trash, "tcp-check send : string too large (%u) for buffer size (%u) at step %d",
				     (unsigned int)istlen(send->data), (unsigned int)b_size(&check->bo),
				     tcpcheck_get_step_id(check, rule));
			set_server_check_status(check, HCHK_STATUS_L7RSP, trash.area);
			ret = TCPCHK_EVAL_STOP;
			goto out;
		}
		b_putist(&check->bo, send->data);
		break;
	case TCPCHK_SEND_STRING_LF:
		check->bo.data = sess_build_logline(check->sess, NULL, b_orig(&check->bo), b_size(&check->bo), &rule->send.fmt);
		if (!b_data(&check->bo))
			goto out;
		break;
	case TCPCHK_SEND_BINARY_LF:
		tmp = alloc_trash_chunk();
		if (!tmp)
			goto error_lf;
		tmp->data = sess_build_logline(check->sess, NULL, b_orig(tmp), b_size(tmp), &rule->send.fmt);
		if (!b_data(tmp))
			goto out;
		tmp->area[tmp->data] = '\0';
		b_set_data(&check->bo, b_size(&check->bo));
		if (parse_binary(b_orig(tmp),  &check->bo.area, (int *)&check->bo.data, NULL) == 0)
			goto error_lf;
		break;
	case TCPCHK_SEND_HTTP: {
		struct htx_sl *sl;
		struct ist meth, uri, vsn, clen, body;
		unsigned int slflags = 0;

		tmp = alloc_trash_chunk();
		if (!tmp)
			goto error_htx;

		meth = ((send->http.meth.meth == HTTP_METH_OTHER)
			? ist2(send->http.meth.str.area, send->http.meth.str.data)
			: http_known_methods[send->http.meth.meth]);
		uri = (isttest(send->http.uri) ? send->http.uri : ist("/")); // TODO: handle uri_fmt
		vsn = (isttest(send->http.vsn) ? send->http.vsn : ist("HTTP/1.0"));

		if (istlen(vsn) == 8 &&
		    (*(vsn.ptr+5) > '1' || (*(vsn.ptr+5) == '1' && *(vsn.ptr+7) >= '1')))
			slflags |= HTX_SL_F_VER_11;
		slflags |= (HTX_SL_F_XFER_LEN|HTX_SL_F_CLEN);
		if (!isttest(send->http.body))
			slflags |= HTX_SL_F_BODYLESS;

		htx = htx_from_buf(&check->bo);
		sl = htx_add_stline(htx, HTX_BLK_REQ_SL, slflags, meth, uri, vsn);
		if (!sl)
			goto error_htx;
		sl->info.req.meth = send->http.meth.meth;

		body = send->http.body; // TODO: handle body_fmt
		clen = ist((!istlen(body) ? "0" : ultoa(istlen(body))));

		if (!htx_add_header(htx, ist("Connection"), ist("close")) ||
		    !htx_add_header(htx, ist("Content-length"), clen))
			goto error_htx;

		if (!LIST_ISEMPTY(&send->http.hdrs)) {
			struct tcpcheck_http_hdr *hdr;

			list_for_each_entry(hdr, &send->http.hdrs, list) {
				chunk_reset(tmp);
                                tmp->data = sess_build_logline(check->sess, NULL, b_orig(tmp), b_size(tmp), &hdr->value);
				if (!b_data(tmp))
					continue;
				if (!htx_add_header(htx, hdr->name, ist2(b_orig(tmp), b_data(tmp))))
					goto error_htx;
			}

		}
		if (check->proxy->options2 & PR_O2_CHK_SNDST) {
			chunk_reset(tmp);
			httpchk_build_status_header(check->server, tmp);
			if (!htx_add_header(htx, ist("X-Haproxy-Server-State"), ist2(b_orig(tmp), b_data(tmp))))
				goto error_htx;
		}

		if (!htx_add_endof(htx, HTX_BLK_EOH) ||
		    (istlen(body) && !htx_add_data_atonce(htx, send->http.body)) ||
		    !htx_add_endof(htx, HTX_BLK_EOM))
			goto error_htx;

		htx_to_buf(htx, &check->bo);
		break;
	}
	case TCPCHK_SEND_UNDEF:
		/* Should never happen. */
		ret = TCPCHK_EVAL_STOP;
		goto out;
	};


	if (conn->mux->snd_buf(cs, &check->bo,
			       (IS_HTX_CONN(conn) ? (htxbuf(&check->bo))->data: b_data(&check->bo)), 0) <= 0) {
		if ((conn->flags & CO_FL_ERROR) || (cs->flags & CS_FL_ERROR)) {
			ret = TCPCHK_EVAL_STOP;
			goto out;
		}
	}
	if ((IS_HTX_CONN(conn) && !htx_is_empty(htxbuf(&check->bo))) || b_data(&check->bo)) {
		cs->conn->mux->subscribe(cs, SUB_RETRY_SEND, &check->wait_list);
		ret = TCPCHK_EVAL_WAIT;
		goto out;
	}

  out:
	free_trash_chunk(tmp);
	return ret;

  error_htx:
	if (htx) {
		htx_reset(htx);
		htx_to_buf(htx, &check->bo);
	}
	chunk_printf(&trash, "tcp-check send : failed to build HTTP request at step %d",
		     tcpcheck_get_step_id(check, rule));
	set_server_check_status(check, HCHK_STATUS_L7RSP, trash.area);
	ret = TCPCHK_EVAL_STOP;
	goto out;

  error_lf:
	chunk_printf(&trash, "tcp-check send : failed to build log-format string at step %d",
		     tcpcheck_get_step_id(check, rule));
	set_server_check_status(check, HCHK_STATUS_L7RSP, trash.area);
	ret = TCPCHK_EVAL_STOP;
	goto out;

}

/* Try to reveice data before evaluting a tcp-check expect rule. Returns
 * TCPCHK_EVAL_WAIT if it is already subcribed on receive events or if nothing
 * was received, TCPCHK_EVAL_CONTINUE to evaluate the expect rule or
 * TCPCHK_EVAL_STOP if an error occurred.
 */
static enum tcpcheck_eval_ret tcpcheck_eval_recv(struct check *check, struct tcpcheck_rule *rule)
{
	struct conn_stream *cs = check->cs;
	struct connection *conn = cs_conn(cs);
	enum tcpcheck_eval_ret ret = TCPCHK_EVAL_CONTINUE;
	size_t max, read, cur_read = 0;
	int is_empty;
	int read_poll = MAX_READ_POLL_LOOPS;

	if (check->wait_list.events & SUB_RETRY_RECV)
		goto wait_more_data;

	if (cs->flags & CS_FL_EOS)
		goto end_recv;

	/* errors on the connection and the conn-stream were already checked */

	/* prepare to detect if the mux needs more room */
	cs->flags &= ~CS_FL_WANT_ROOM;

	while ((cs->flags & CS_FL_RCV_MORE) ||
	       (!(conn->flags & CO_FL_ERROR) && !(cs->flags & (CS_FL_ERROR|CS_FL_EOS)))) {
		max = (IS_HTX_CS(cs) ?  htx_free_space(htxbuf(&check->bi)) : b_room(&check->bi));
		read = conn->mux->rcv_buf(cs, &check->bi, max, 0);
		cur_read += read;
		if (!read ||
		    (cs->flags & CS_FL_WANT_ROOM) ||
		    (--read_poll <= 0) ||
		    (read < max && read >= global.tune.recv_enough))
			break;
	}

  end_recv:
	is_empty = (IS_HTX_CS(cs) ? htx_is_empty(htxbuf(&check->bi)) : !b_data(&check->bi));
	if (is_empty && ((conn->flags & CO_FL_ERROR) || (cs->flags & CS_FL_ERROR))) {
		/* Report network errors only if we got no other data. Otherwise
		 * we'll let the upper layers decide whether the response is OK
		 * or not. It is very common that an RST sent by the server is
		 * reported as an error just after the last data chunk.
		 */
		goto stop;
	}
	if (!cur_read) {
		if (!(cs->flags & (CS_FL_WANT_ROOM|CS_FL_ERROR|CS_FL_EOS))) {
			conn->mux->subscribe(cs, SUB_RETRY_RECV, &check->wait_list);
			goto wait_more_data;
		}
		if (is_empty) {
			chunk_printf(&trash, "TCPCHK got an empty response at step %d",
				     tcpcheck_get_step_id(check, rule));
			if (rule->comment)
				chunk_appendf(&trash, " comment: '%s'", rule->comment);
			set_server_check_status(check, rule->expect.err_status, trash.area);
			goto stop;
		}
	}

  out:
	return ret;

  stop:
	ret = TCPCHK_EVAL_STOP;
	goto out;

  wait_more_data:
	ret = TCPCHK_EVAL_WAIT;
	goto out;
}

/* Evaluates an HTTP TCPCHK_ACT_EXPECT rule. If <last_read> is set , no more data
 * are expected. Returns TCPCHK_EVAL_WAIT to wait for more data,
 * TCPCHK_EVAL_CONTINUE to evaluate the next rule or TCPCHK_EVAL_STOP if an
 * error occurred.
 */
static enum tcpcheck_eval_ret tcpcheck_eval_expect_http(struct check *check, struct tcpcheck_rule *rule, int last_read)
{
	struct htx *htx = htxbuf(&check->bi);
	struct htx_sl *sl;
	struct htx_blk *blk;
	enum tcpcheck_eval_ret ret = TCPCHK_EVAL_CONTINUE;
	struct tcpcheck_expect *expect = &rule->expect;
	struct buffer *msg = NULL;
	enum healthcheck_status status;
	struct ist desc = IST_NULL;
	int match, inverse;

	last_read |= (!htx_free_space(htx) || (htx_get_tail_type(htx) == HTX_BLK_EOM));

	if (htx->flags & HTX_FL_PARSING_ERROR) {
		status = HCHK_STATUS_L7RSP;
		goto error;
	}

	if (htx_is_empty(htx)) {
		if (last_read) {
			status = HCHK_STATUS_L7RSP;
			goto error;
		}
		goto wait_more_data;
	}

	sl = http_get_stline(htx);
	check->code = sl->info.res.status;

	if (check->server &&
	    (check->server->proxy->options & PR_O_DISABLE404) &&
	    (check->server->next_state != SRV_ST_STOPPED) &&
	    (check->code == 404)) {
		/* 404 may be accepted as "stopping" only if the server was up */
		goto out;
	}

	inverse = !!(expect->flags & TCPCHK_EXPT_FL_INV);
	/* Make GCC happy ; initialize match to a failure state. */
	match = inverse;

	switch (expect->type) {
	case TCPCHK_EXPECT_HTTP_STATUS:
		match = isteq(htx_sl_res_code(sl), expect->data);

		/* Set status and description in case of error */
		status = HCHK_STATUS_L7STS;
		desc   = htx_sl_res_reason(sl);
		break;
	case TCPCHK_EXPECT_HTTP_REGEX_STATUS:
		match = regex_exec2(expect->regex, HTX_SL_RES_CPTR(sl), HTX_SL_RES_CLEN(sl));

		/* Set status and description in case of error */
		status = HCHK_STATUS_L7STS;
		desc   = htx_sl_res_reason(sl);
		break;

	case TCPCHK_EXPECT_HTTP_BODY:
	case TCPCHK_EXPECT_HTTP_REGEX_BODY:
		chunk_reset(&trash);
		for (blk = htx_get_head_blk(htx); blk; blk = htx_get_next_blk(htx, blk)) {
			enum htx_blk_type type = htx_get_blk_type(blk);

			if (type == HTX_BLK_EOM || type == HTX_BLK_TLR || type == HTX_BLK_EOT)
				break;
			if (type == HTX_BLK_DATA) {
				if (!chunk_istcat(&trash, htx_get_blk_value(htx, blk)))
					break;
			}
		}

		if (!b_data(&trash)) {
			if (!last_read)
				goto wait_more_data;
			status = HCHK_STATUS_L7RSP;
			desc = ist("HTTP content check could not find a response body");
			goto error;
		}

		if (!last_read &&
		    ((expect->type == TCPCHK_EXPECT_HTTP_BODY && b_data(&trash) < istlen(expect->data)) ||
		     (expect->min_recv > 0 && b_data(&trash) < expect->min_recv))) {
			ret = TCPCHK_EVAL_WAIT;
			goto out;
		}

		if (expect->type ==TCPCHK_EXPECT_HTTP_BODY)
			match = my_memmem(b_orig(&trash), b_data(&trash), istptr(expect->data), istlen(expect->data)) != NULL;
		else
			match = regex_exec2(expect->regex, b_orig(&trash), b_data(&trash));

		/* Set status and description in case of error */
		status = HCHK_STATUS_L7RSP;
		desc = (inverse
			? ist("HTTP check matched unwanted content")
			: ist("HTTP content check did not match"));
		break;

	default:
		/* should never happen */
		status = HCHK_STATUS_L7RSP;
		goto error;
	}

	/* Wait for more data on mismatch only if no minimum is defined (-1),
	 * otherwise the absence of match is already conclusive.
	 */
	if (!match && !last_read && (expect->min_recv == -1)) {
		ret = TCPCHK_EVAL_WAIT;
		goto out;
	}

	if (!(match ^ inverse))
		goto error;

  out:
	free_trash_chunk(msg);
	return ret;

  error:
	ret = TCPCHK_EVAL_STOP;
	msg = alloc_trash_chunk();
	if (msg)
		tcpcheck_expect_onerror_message(msg, check, rule, 0, desc);
	set_server_check_status(check, status, (msg ? b_head(msg) : NULL));
	goto out;

  wait_more_data:
	ret = TCPCHK_EVAL_WAIT;
	goto out;
}

/* Evaluates a TCP TCPCHK_ACT_EXPECT rule. Returns TCPCHK_EVAL_WAIT to wait for
 * more data, TCPCHK_EVAL_CONTINUE to evaluate the next rule or TCPCHK_EVAL_STOP
 * if an error occurred.
 */
static enum tcpcheck_eval_ret tcpcheck_eval_expect(struct check *check, struct tcpcheck_rule *rule, int last_read)
{
	enum tcpcheck_eval_ret ret = TCPCHK_EVAL_CONTINUE;
	struct tcpcheck_expect *expect = &rule->expect;
	struct buffer *msg = NULL;
	int match, inverse;

	last_read |= b_full(&check->bi);

	/* The current expect might need more data than the previous one, check again
	 * that the minimum amount data required to match is respected.
	 */
	if (!last_read) {
		if ((expect->type == TCPCHK_EXPECT_STRING || expect->type == TCPCHK_EXPECT_BINARY) &&
		    (b_data(&check->bi) < istlen(expect->data))) {
			ret = TCPCHK_EVAL_WAIT;
			goto out;
		}
		if (expect->min_recv > 0 && (b_data(&check->bi) < expect->min_recv)) {
			ret = TCPCHK_EVAL_WAIT;
			goto out;
		}
	}

	inverse = !!(expect->flags & TCPCHK_EXPT_FL_INV);
	/* Make GCC happy ; initialize match to a failure state. */
	match = inverse;

	switch (expect->type) {
	case TCPCHK_EXPECT_STRING:
	case TCPCHK_EXPECT_BINARY:
		match = my_memmem(b_head(&check->bi), b_data(&check->bi), istptr(expect->data), istlen(expect->data)) != NULL;
		break;
	case TCPCHK_EXPECT_REGEX:
		match = regex_exec2(expect->regex, b_head(&check->bi), MIN(b_data(&check->bi), b_size(&check->bi)-1));
		break;

	case TCPCHK_EXPECT_REGEX_BINARY:
		chunk_reset(&trash);
		dump_binary(&trash, b_head(&check->bi), b_data(&check->bi));
		match = regex_exec2(expect->regex, b_head(&trash), MIN(b_data(&trash), b_size(&trash)-1));
		break;
	case TCPCHK_EXPECT_CUSTOM:
		if (expect->custom)
			ret = expect->custom(check, rule, last_read);
		goto out;
	default:
		/* Should never happen. */
		ret = TCPCHK_EVAL_STOP;
		goto out;
	}


	/* Wait for more data on mismatch only if no minimum is defined (-1),
	 * otherwise the absence of match is already conclusive.
	 */
	if (!match && !last_read && (expect->min_recv == -1)) {
		ret = TCPCHK_EVAL_WAIT;
		goto out;
	}

	/* Result as expected, next rule. */
	if (match ^ inverse)
		goto out;


	/* From this point on, we matched something we did not want, this is an error state. */
	ret = TCPCHK_EVAL_STOP;
	msg = alloc_trash_chunk();
	if (msg)
		tcpcheck_expect_onerror_message(msg, check, rule, match, IST_NULL);
	set_server_check_status(check, expect->err_status, (msg ? b_head(msg) : NULL));
	free_trash_chunk(msg);
	ret = TCPCHK_EVAL_STOP;

  out:
	return ret;
}

/* Evaluates a TCPCHK_ACT_ACTION_KW rule. Returns TCPCHK_EVAL_CONTINUE to
 * evaluate the next rule or TCPCHK_EVAL_STOP if an error occurred. It nevers
 * waits.
 */
static enum tcpcheck_eval_ret tcpcheck_eval_action_kw(struct check *check, struct tcpcheck_rule *rule)
{
	enum tcpcheck_eval_ret ret = TCPCHK_EVAL_CONTINUE;
	struct act_rule *act_rule;
	enum act_return act_ret;

	act_rule =rule->action_kw.rule;
	act_ret = act_rule->action_ptr(act_rule, check->proxy, check->sess, NULL, 0);
	if (act_ret != ACT_RET_CONT) {
		chunk_printf(&trash, "TCPCHK ACTION unexpected result at step %d\n",
			     tcpcheck_get_step_id(check, rule));
		set_server_check_status(check, HCHK_STATUS_L7RSP, trash.area);
		ret = TCPCHK_EVAL_STOP;
	}

	return ret;
}

/* Executes a tcp-check ruleset. Note that this is called both from the
 * connection's wake() callback and from the check scheduling task.  It returns
 * 0 on normal cases, or <0 if a close() has happened on an existing connection,
 * presenting the risk of an fd replacement.
 *
 * Please do NOT place any return statement in this function and only leave
 * via the out_end_tcpcheck label after setting retcode.
 */
static int tcpcheck_main(struct check *check)
{
	struct tcpcheck_rule *rule;
	struct conn_stream *cs = check->cs;
	struct connection *conn = cs_conn(cs);
	int must_read = 1, last_read = 0;
	int ret, retcode = 0;

	/* here, we know that the check is complete or that it failed */
	if (check->result != CHK_RES_UNKNOWN)
		goto out_end_tcpcheck;

	/* 1- check for connection error, if any */
	if ((conn && conn->flags & CO_FL_ERROR) || (cs && cs->flags & CS_FL_ERROR))
		goto out_end_tcpcheck;

	/* 2- check if we are waiting for the connection establishment. It only
	 *    happens during TCPCHK_ACT_CONNECT. */
	if (check->current_step && check->current_step->action == TCPCHK_ACT_CONNECT) {
		rule = LIST_NEXT(&check->current_step->list, typeof(rule), list);
		if (conn && (conn->flags & CO_FL_WAIT_XPRT)) {
			if (rule->action == TCPCHK_ACT_SEND)
				conn->mux->subscribe(cs, SUB_RETRY_SEND, &check->wait_list);
			else if (rule->action == TCPCHK_ACT_EXPECT)
				conn->mux->subscribe(cs, SUB_RETRY_RECV, &check->wait_list);
			goto out;
		}
	}

	/* 3- check for pending outgoing data. It only happens during
	 *    TCPCHK_ACT_SEND. */
	else if (check->current_step && check->current_step->action == TCPCHK_ACT_SEND) {
		if (conn && b_data(&check->bo)) {
			ret = conn->mux->snd_buf(cs, &check->bo,
						 (IS_HTX_CONN(conn) ? (htxbuf(&check->bo))->data: b_data(&check->bo)), 0);
			if (ret <= 0) {
				if ((conn && conn->flags & CO_FL_ERROR) || (cs && cs->flags & CS_FL_ERROR))
					goto out_end_tcpcheck;
			}
			if ((IS_HTX_CONN(conn) && !htx_is_empty(htxbuf(&check->bo))) || b_data(&check->bo)) {
				cs->conn->mux->subscribe(cs, SUB_RETRY_SEND, &check->wait_list);
				goto out;
			}
		}
		rule = LIST_NEXT(&check->current_step->list, typeof(rule), list);
	}

	/* 4- check if a rule must be resume. It happens if check->current_step
	 *    is defined. */
	else if (check->current_step)
		rule = check->current_step;

	/* 5- It is the first evaluation. We must create a session and preset
	 *    tcp-check variables */
        else {
		struct tcpcheck_var *var;

		/* First evaluation, create a session */
		check->sess = session_new(&checks_fe, NULL, &check->obj_type);
		if (!check->sess) {
			chunk_printf(&trash, "TCPCHK error allocating check session");
			set_server_check_status(check, HCHK_STATUS_SOCKERR, trash.area);
			goto out_end_tcpcheck;
		}
		vars_init(&check->vars, SCOPE_CHECK);
		rule = LIST_NEXT(check->tcpcheck_rules->list, typeof(rule), list);

		/* Preset tcp-check variables */
		list_for_each_entry(var, &check->tcpcheck_rules->preset_vars, list) {
			struct sample smp;

			memset(&smp, 0, sizeof(smp));
			smp_set_owner(&smp, check->proxy, check->sess, NULL, SMP_OPT_FINAL);
			smp.data = var->data;
			vars_set_by_name_ifexist(istptr(var->name), istlen(var->name), &smp);
		}
	}

	/* Now evaluate the tcp-check rules */

	list_for_each_entry_from(rule, check->tcpcheck_rules->list, list) {
		enum tcpcheck_eval_ret eval_ret;

		check->code = 0;
		switch (rule->action) {
		case TCPCHK_ACT_CONNECT:
			check->current_step = rule;

			/* close but not release yet previous connection  */
			if (check->cs) {
				cs_close(check->cs);
				retcode = -1; /* do not reuse the fd in the caller! */
			}
			eval_ret = tcpcheck_eval_connect(check, rule);
			must_read = 1; last_read = 0;
			break;
		case TCPCHK_ACT_SEND:
			check->current_step = rule;
			eval_ret = tcpcheck_eval_send(check, rule);
			must_read = 1;
			break;
		case TCPCHK_ACT_EXPECT:
			check->current_step = rule;
			if (must_read) {
				if (check->proxy->timeout.check)
					check->task->expire = tick_add_ifset(now_ms, check->proxy->timeout.check);

				eval_ret = tcpcheck_eval_recv(check, rule);
				if (eval_ret == TCPCHK_EVAL_STOP)
					goto out_end_tcpcheck;
				else if (eval_ret == TCPCHK_EVAL_WAIT)
					goto out;
				last_read = ((conn->flags & CO_FL_ERROR) || (cs->flags & (CS_FL_ERROR|CS_FL_EOS)));
				must_read = 0;
			}

			eval_ret = ((check->tcpcheck_rules->flags & TCPCHK_RULES_PROTO_CHK) == TCPCHK_RULES_HTTP_CHK
				    ? tcpcheck_eval_expect_http(check, rule, last_read)
				    : tcpcheck_eval_expect(check, rule, last_read));

			if (eval_ret == TCPCHK_EVAL_WAIT) {
				check->current_step = rule->expect.head;
				conn->mux->subscribe(cs, SUB_RETRY_RECV, &check->wait_list);
			}
			break;
		case TCPCHK_ACT_ACTION_KW:
			/* Don't update the current step */
			eval_ret = tcpcheck_eval_action_kw(check, rule);
			break;
		default:
			/* Otherwise, just go to the next one and don't update
			 * the current step
			 */
			eval_ret = TCPCHK_EVAL_CONTINUE;
			break;
		}

		switch (eval_ret) {
		case TCPCHK_EVAL_CONTINUE:
			break;
		case TCPCHK_EVAL_WAIT:
			goto out;
		case TCPCHK_EVAL_STOP:
			goto out_end_tcpcheck;
		}
	}

	/* All rules was evaluated */
	if (check->current_step) {
		rule = check->current_step;

		if (rule->action == TCPCHK_ACT_EXPECT) {
			struct buffer *msg;

			if (check->server &&
			    (check->server->proxy->options & PR_O_DISABLE404) &&
			    (check->server->next_state != SRV_ST_STOPPED) &&
			    (check->code == 404)) {
				set_server_check_status(check, HCHK_STATUS_L7OKCD, NULL);
				goto out_end_tcpcheck;
			}

			msg = alloc_trash_chunk();
			if (msg)
				tcpcheck_expect_onsuccess_message(msg, check, rule, IST_NULL);
			set_server_check_status(check, rule->expect.ok_status,
						(msg ? b_head(msg) : "(tcp-check)"));
			free_trash_chunk(msg);
		}
		else if (rule->action == TCPCHK_ACT_CONNECT) {
			const char *msg = ((rule->connect.options & TCPCHK_OPT_IMPLICIT) ? NULL : "(tcp-check)");
			enum healthcheck_status status = ((conn && ssl_sock_is_ssl(conn)) ? HCHK_STATUS_L6OK : HCHK_STATUS_L4OK);

			set_server_check_status(check, status, msg);
		}
	}
	else
		set_server_check_status(check, HCHK_STATUS_L7OKD, "(tcp-check)");

  out_end_tcpcheck:
	if ((conn && conn->flags & CO_FL_ERROR) || (cs && cs->flags & CS_FL_ERROR))
		chk_report_conn_err(check, errno, 0);

	/* cleanup before leaving */
	check->current_step = NULL;
	if (check->sess != NULL) {
		vars_prune(&check->vars, check->sess, NULL);
		session_free(check->sess);
		check->sess = NULL;
	}
  out:
	return retcode;
}


/**************************************************************************/
/************** Health-checks based on an external process ****************/
/**************************************************************************/
static struct list pid_list = LIST_HEAD_INIT(pid_list);
static struct pool_head *pool_head_pid_list;
__decl_spinlock(pid_list_lock);

struct extcheck_env {
	char *name;	/* environment variable name */
	int vmaxlen;	/* value maximum length, used to determine the required memory allocation */
};

/* environment variables memory requirement for different types of data */
#define EXTCHK_SIZE_EVAL_INIT 0                  /* size determined during the init phase,
                                                  * such environment variables are not updatable. */
#define EXTCHK_SIZE_ULONG     20                 /* max string length for an unsigned long value */
#define EXTCHK_SIZE_UINT      11                 /* max string length for an unsigned int value */
#define EXTCHK_SIZE_ADDR      INET6_ADDRSTRLEN+1 /* max string length for an address */

/* external checks environment variables */
enum {
	EXTCHK_PATH = 0,

	/* Proxy specific environment variables */
	EXTCHK_HAPROXY_PROXY_NAME,	/* the backend name */
	EXTCHK_HAPROXY_PROXY_ID,	/* the backend id */
	EXTCHK_HAPROXY_PROXY_ADDR,	/* the first bind address if available (or empty) */
	EXTCHK_HAPROXY_PROXY_PORT,	/* the first bind port if available (or empty) */

	/* Server specific environment variables */
	EXTCHK_HAPROXY_SERVER_NAME,	/* the server name */
	EXTCHK_HAPROXY_SERVER_ID,	/* the server id */
	EXTCHK_HAPROXY_SERVER_ADDR,	/* the server address */
	EXTCHK_HAPROXY_SERVER_PORT,	/* the server port if available (or empty) */
	EXTCHK_HAPROXY_SERVER_MAXCONN,	/* the server max connections */
	EXTCHK_HAPROXY_SERVER_CURCONN,	/* the current number of connections on the server */

	EXTCHK_SIZE
};

const struct extcheck_env extcheck_envs[EXTCHK_SIZE] = {
	[EXTCHK_PATH]                   = { "PATH",                   EXTCHK_SIZE_EVAL_INIT },
	[EXTCHK_HAPROXY_PROXY_NAME]     = { "HAPROXY_PROXY_NAME",     EXTCHK_SIZE_EVAL_INIT },
	[EXTCHK_HAPROXY_PROXY_ID]       = { "HAPROXY_PROXY_ID",       EXTCHK_SIZE_EVAL_INIT },
	[EXTCHK_HAPROXY_PROXY_ADDR]     = { "HAPROXY_PROXY_ADDR",     EXTCHK_SIZE_EVAL_INIT },
	[EXTCHK_HAPROXY_PROXY_PORT]     = { "HAPROXY_PROXY_PORT",     EXTCHK_SIZE_EVAL_INIT },
	[EXTCHK_HAPROXY_SERVER_NAME]    = { "HAPROXY_SERVER_NAME",    EXTCHK_SIZE_EVAL_INIT },
	[EXTCHK_HAPROXY_SERVER_ID]      = { "HAPROXY_SERVER_ID",      EXTCHK_SIZE_EVAL_INIT },
	[EXTCHK_HAPROXY_SERVER_ADDR]    = { "HAPROXY_SERVER_ADDR",    EXTCHK_SIZE_ADDR },
	[EXTCHK_HAPROXY_SERVER_PORT]    = { "HAPROXY_SERVER_PORT",    EXTCHK_SIZE_UINT },
	[EXTCHK_HAPROXY_SERVER_MAXCONN] = { "HAPROXY_SERVER_MAXCONN", EXTCHK_SIZE_EVAL_INIT },
	[EXTCHK_HAPROXY_SERVER_CURCONN] = { "HAPROXY_SERVER_CURCONN", EXTCHK_SIZE_ULONG },
};

void block_sigchld(void)
{
	sigset_t set;
	sigemptyset(&set);
	sigaddset(&set, SIGCHLD);
	assert(ha_sigmask(SIG_BLOCK, &set, NULL) == 0);
}

void unblock_sigchld(void)
{
	sigset_t set;
	sigemptyset(&set);
	sigaddset(&set, SIGCHLD);
	assert(ha_sigmask(SIG_UNBLOCK, &set, NULL) == 0);
}

static struct pid_list *pid_list_add(pid_t pid, struct task *t)
{
	struct pid_list *elem;
	struct check *check = t->context;

	elem = pool_alloc(pool_head_pid_list);
	if (!elem)
		return NULL;
	elem->pid = pid;
	elem->t = t;
	elem->exited = 0;
	check->curpid = elem;
	LIST_INIT(&elem->list);

	HA_SPIN_LOCK(PID_LIST_LOCK, &pid_list_lock);
	LIST_ADD(&pid_list, &elem->list);
	HA_SPIN_UNLOCK(PID_LIST_LOCK, &pid_list_lock);

	return elem;
}

static void pid_list_del(struct pid_list *elem)
{
	struct check *check;

	if (!elem)
		return;

	HA_SPIN_LOCK(PID_LIST_LOCK, &pid_list_lock);
	LIST_DEL(&elem->list);
	HA_SPIN_UNLOCK(PID_LIST_LOCK, &pid_list_lock);

	if (!elem->exited)
		kill(elem->pid, SIGTERM);

	check = elem->t->context;
	check->curpid = NULL;
	pool_free(pool_head_pid_list, elem);
}

/* Called from inside SIGCHLD handler, SIGCHLD is blocked */
static void pid_list_expire(pid_t pid, int status)
{
	struct pid_list *elem;

	HA_SPIN_LOCK(PID_LIST_LOCK, &pid_list_lock);
	list_for_each_entry(elem, &pid_list, list) {
		if (elem->pid == pid) {
			elem->t->expire = now_ms;
			elem->status = status;
			elem->exited = 1;
			task_wakeup(elem->t, TASK_WOKEN_IO);
			break;
		}
	}
	HA_SPIN_UNLOCK(PID_LIST_LOCK, &pid_list_lock);
}

static void sigchld_handler(struct sig_handler *sh)
{
	pid_t pid;
	int status;

	while ((pid = waitpid(0, &status, WNOHANG)) > 0)
		pid_list_expire(pid, status);
}

static int init_pid_list(void)
{
	if (pool_head_pid_list != NULL)
		/* Nothing to do */
		return 0;

	if (!signal_register_fct(SIGCHLD, sigchld_handler, SIGCHLD)) {
		ha_alert("Failed to set signal handler for external health checks: %s. Aborting.\n",
			 strerror(errno));
		return 1;
	}

	pool_head_pid_list = create_pool("pid_list", sizeof(struct pid_list), MEM_F_SHARED);
	if (pool_head_pid_list == NULL) {
		ha_alert("Failed to allocate memory pool for external health checks: %s. Aborting.\n",
			 strerror(errno));
		return 1;
	}

	return 0;
}

/* helper macro to set an environment variable and jump to a specific label on failure. */
#define EXTCHK_SETENV(check, envidx, value, fail) { if (extchk_setenv(check, envidx, value)) goto fail; }

/*
 * helper function to allocate enough memory to store an environment variable.
 * It will also check that the environment variable is updatable, and silently
 * fail if not.
 */
static int extchk_setenv(struct check *check, int idx, const char *value)
{
	int len, ret;
	char *envname;
	int vmaxlen;

	if (idx < 0 || idx >= EXTCHK_SIZE) {
		ha_alert("Illegal environment variable index %d. Aborting.\n", idx);
		return 1;
	}

	envname = extcheck_envs[idx].name;
	vmaxlen = extcheck_envs[idx].vmaxlen;

	/* Check if the environment variable is already set, and silently reject
	 * the update if this one is not updatable. */
	if ((vmaxlen == EXTCHK_SIZE_EVAL_INIT) && (check->envp[idx]))
		return 0;

	/* Instead of sending NOT_USED, sending an empty value is preferable */
	if (strcmp(value, "NOT_USED") == 0) {
		value = "";
	}

	len = strlen(envname) + 1;
	if (vmaxlen == EXTCHK_SIZE_EVAL_INIT)
		len += strlen(value);
	else
		len += vmaxlen;

	if (!check->envp[idx])
		check->envp[idx] = malloc(len + 1);

	if (!check->envp[idx]) {
		ha_alert("Failed to allocate memory for the environment variable '%s'. Aborting.\n", envname);
		return 1;
	}
	ret = snprintf(check->envp[idx], len + 1, "%s=%s", envname, value);
	if (ret < 0) {
		ha_alert("Failed to store the environment variable '%s'. Reason : %s. Aborting.\n", envname, strerror(errno));
		return 1;
	}
	else if (ret > len) {
		ha_alert("Environment variable '%s' was truncated. Aborting.\n", envname);
		return 1;
	}
	return 0;
}

static int prepare_external_check(struct check *check)
{
	struct server *s = check->server;
	struct proxy *px = s->proxy;
	struct listener *listener = NULL, *l;
	int i;
	const char *path = px->check_path ? px->check_path : DEF_CHECK_PATH;
	char buf[256];

	list_for_each_entry(l, &px->conf.listeners, by_fe)
		/* Use the first INET, INET6 or UNIX listener */
		if (l->addr.ss_family == AF_INET ||
		    l->addr.ss_family == AF_INET6 ||
		    l->addr.ss_family == AF_UNIX) {
			listener = l;
			break;
		}

	check->curpid = NULL;
	check->envp = calloc((EXTCHK_SIZE + 1), sizeof(char *));
	if (!check->envp) {
		ha_alert("Failed to allocate memory for environment variables. Aborting\n");
		goto err;
	}

	check->argv = calloc(6, sizeof(char *));
	if (!check->argv) {
		ha_alert("Starting [%s:%s] check: out of memory.\n", px->id, s->id);
		goto err;
	}

	check->argv[0] = px->check_command;

	if (!listener) {
		check->argv[1] = strdup("NOT_USED");
		check->argv[2] = strdup("NOT_USED");
	}
	else if (listener->addr.ss_family == AF_INET ||
	    listener->addr.ss_family == AF_INET6) {
		addr_to_str(&listener->addr, buf, sizeof(buf));
		check->argv[1] = strdup(buf);
		port_to_str(&listener->addr, buf, sizeof(buf));
		check->argv[2] = strdup(buf);
	}
	else if (listener->addr.ss_family == AF_UNIX) {
		const struct sockaddr_un *un;

		un = (struct sockaddr_un *)&listener->addr;
		check->argv[1] = strdup(un->sun_path);
		check->argv[2] = strdup("NOT_USED");
	}
	else {
		ha_alert("Starting [%s:%s] check: unsupported address family.\n", px->id, s->id);
		goto err;
	}

	if (!check->argv[1] || !check->argv[2]) {
		ha_alert("Starting [%s:%s] check: out of memory.\n", px->id, s->id);
		goto err;
	}

	check->argv[3] = calloc(EXTCHK_SIZE_ADDR, sizeof(*check->argv[3]));
	check->argv[4] = calloc(EXTCHK_SIZE_UINT, sizeof(*check->argv[4]));
	if (!check->argv[3] || !check->argv[4]) {
		ha_alert("Starting [%s:%s] check: out of memory.\n", px->id, s->id);
		goto err;
	}

	addr_to_str(&s->addr, check->argv[3], EXTCHK_SIZE_ADDR);
	if (s->addr.ss_family == AF_INET || s->addr.ss_family == AF_INET6)
		snprintf(check->argv[4], EXTCHK_SIZE_UINT, "%u", s->svc_port);

	for (i = 0; i < 5; i++) {
		if (!check->argv[i]) {
			ha_alert("Starting [%s:%s] check: out of memory.\n", px->id, s->id);
			goto err;
		}
	}

	EXTCHK_SETENV(check, EXTCHK_PATH, path, err);
	/* Add proxy environment variables */
	EXTCHK_SETENV(check, EXTCHK_HAPROXY_PROXY_NAME, px->id, err);
	EXTCHK_SETENV(check, EXTCHK_HAPROXY_PROXY_ID, ultoa_r(px->uuid, buf, sizeof(buf)), err);
	EXTCHK_SETENV(check, EXTCHK_HAPROXY_PROXY_ADDR, check->argv[1], err);
	EXTCHK_SETENV(check, EXTCHK_HAPROXY_PROXY_PORT, check->argv[2], err);
	/* Add server environment variables */
	EXTCHK_SETENV(check, EXTCHK_HAPROXY_SERVER_NAME, s->id, err);
	EXTCHK_SETENV(check, EXTCHK_HAPROXY_SERVER_ID, ultoa_r(s->puid, buf, sizeof(buf)), err);
	EXTCHK_SETENV(check, EXTCHK_HAPROXY_SERVER_ADDR, check->argv[3], err);
	EXTCHK_SETENV(check, EXTCHK_HAPROXY_SERVER_PORT, check->argv[4], err);
	EXTCHK_SETENV(check, EXTCHK_HAPROXY_SERVER_MAXCONN, ultoa_r(s->maxconn, buf, sizeof(buf)), err);
	EXTCHK_SETENV(check, EXTCHK_HAPROXY_SERVER_CURCONN, ultoa_r(s->cur_sess, buf, sizeof(buf)), err);

	/* Ensure that we don't leave any hole in check->envp */
	for (i = 0; i < EXTCHK_SIZE; i++)
		if (!check->envp[i])
			EXTCHK_SETENV(check, i, "", err);

	return 1;
err:
	if (check->envp) {
		for (i = 0; i < EXTCHK_SIZE; i++)
			free(check->envp[i]);
		free(check->envp);
		check->envp = NULL;
	}

	if (check->argv) {
		for (i = 1; i < 5; i++)
			free(check->argv[i]);
		free(check->argv);
		check->argv = NULL;
	}
	return 0;
}

/*
 * establish a server health-check that makes use of a process.
 *
 * It can return one of :
 *  - SF_ERR_NONE if everything's OK
 *  - SF_ERR_RESOURCE if a system resource is lacking (eg: fd limits, ports, ...)
 * Additionally, in the case of SF_ERR_RESOURCE, an emergency log will be emitted.
 *
 * Blocks and then unblocks SIGCHLD
 */
static int connect_proc_chk(struct task *t)
{
	char buf[256];
	struct check *check = t->context;
	struct server *s = check->server;
	struct proxy *px = s->proxy;
	int status;
	pid_t pid;

	status = SF_ERR_RESOURCE;

	block_sigchld();

	pid = fork();
	if (pid < 0) {
		ha_alert("Failed to fork process for external health check%s: %s. Aborting.\n",
			 (global.tune.options & GTUNE_INSECURE_FORK) ?
			 "" : " (likely caused by missing 'insecure-fork-wanted')",
			 strerror(errno));
		set_server_check_status(check, HCHK_STATUS_SOCKERR, strerror(errno));
		goto out;
	}
	if (pid == 0) {
		/* Child */
		extern char **environ;
		struct rlimit limit;
		int fd;

		/* close all FDs. Keep stdin/stdout/stderr in verbose mode */
		fd = (global.mode & (MODE_QUIET|MODE_VERBOSE)) == MODE_QUIET ? 0 : 3;

		my_closefrom(fd);

		/* 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("External check: 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);
		}

		environ = check->envp;

		/* Update some environment variables and command args: curconn, server addr and server port */
		extchk_setenv(check, EXTCHK_HAPROXY_SERVER_CURCONN, ultoa_r(s->cur_sess, buf, sizeof(buf)));

		addr_to_str(&s->addr, check->argv[3], EXTCHK_SIZE_ADDR);
		extchk_setenv(check, EXTCHK_HAPROXY_SERVER_ADDR, check->argv[3]);

		*check->argv[4] = 0;
		if (s->addr.ss_family == AF_INET || s->addr.ss_family == AF_INET6)
			snprintf(check->argv[4], EXTCHK_SIZE_UINT, "%u", s->svc_port);
		extchk_setenv(check, EXTCHK_HAPROXY_SERVER_PORT, check->argv[4]);

		haproxy_unblock_signals();
		execvp(px->check_command, check->argv);
		ha_alert("Failed to exec process for external health check: %s. Aborting.\n",
			 strerror(errno));
		exit(-1);
	}

	/* Parent */
	if (check->result == CHK_RES_UNKNOWN) {
		if (pid_list_add(pid, t) != NULL) {
			t->expire = tick_add(now_ms, MS_TO_TICKS(check->inter));

			if (px->timeout.check && px->timeout.connect) {
				int t_con = tick_add(now_ms, px->timeout.connect);
				t->expire = tick_first(t->expire, t_con);
			}
			status = SF_ERR_NONE;
			goto out;
		}
		else {
			set_server_check_status(check, HCHK_STATUS_SOCKERR, strerror(errno));
		}
		kill(pid, SIGTERM); /* process creation error */
	}
	else
		set_server_check_status(check, HCHK_STATUS_SOCKERR, strerror(errno));

out:
	unblock_sigchld();
	return status;
}

/*
 * manages a server health-check that uses an external process. Returns
 * the time the task accepts to wait, or TIME_ETERNITY for infinity.
 *
 * Please do NOT place any return statement in this function and only leave
 * via the out_unlock label.
 */
static struct task *process_chk_proc(struct task *t, void *context, unsigned short state)
{
	struct check *check = context;
	struct server *s = check->server;
	int rv;
	int ret;
	int expired = tick_is_expired(t->expire, now_ms);

	HA_SPIN_LOCK(SERVER_LOCK, &check->server->lock);
	if (!(check->state & CHK_ST_INPROGRESS)) {
		/* no check currently running */
		if (!expired) /* woke up too early */
			goto out_unlock;

		/* we don't send any health-checks when the proxy is
		 * stopped, the server should not be checked or the check
		 * is disabled.
		 */
		if (((check->state & (CHK_ST_ENABLED | CHK_ST_PAUSED)) != CHK_ST_ENABLED) ||
		    s->proxy->state == PR_STSTOPPED)
			goto reschedule;

		/* we'll initiate a new check */
		set_server_check_status(check, HCHK_STATUS_START, NULL);

		check->state |= CHK_ST_INPROGRESS;

		ret = connect_proc_chk(t);
		if (ret == SF_ERR_NONE) {
			/* the process was forked, we allow up to min(inter,
			 * timeout.connect) for it to report its status, but
			 * only when timeout.check is set as it may be to short
			 * for a full check otherwise.
			 */
			t->expire = tick_add(now_ms, MS_TO_TICKS(check->inter));

			if (s->proxy->timeout.check && s->proxy->timeout.connect) {
				int t_con = tick_add(now_ms, s->proxy->timeout.connect);
				t->expire = tick_first(t->expire, t_con);
			}
			task_set_affinity(t, tid_bit);
			goto reschedule;
		}

		/* here, we failed to start the check */

		check->state &= ~CHK_ST_INPROGRESS;
		check_notify_failure(check);

		/* we allow up to min(inter, timeout.connect) for a connection
		 * to establish but only when timeout.check is set
		 * as it may be to short for a full check otherwise
		 */
		while (tick_is_expired(t->expire, now_ms)) {
			int t_con;

			t_con = tick_add(t->expire, s->proxy->timeout.connect);
			t->expire = tick_add(t->expire, MS_TO_TICKS(check->inter));

			if (s->proxy->timeout.check)
				t->expire = tick_first(t->expire, t_con);
		}
	}
	else {
		/* there was a test running.
		 * First, let's check whether there was an uncaught error,
		 * which can happen on connect timeout or error.
		 */
		if (check->result == CHK_RES_UNKNOWN) {
			/* good connection is enough for pure TCP check */
			struct pid_list *elem = check->curpid;
			int status = HCHK_STATUS_UNKNOWN;

			if (elem->exited) {
				status = elem->status; /* Save in case the process exits between use below */
				if (!WIFEXITED(status))
					check->code = -1;
				else
					check->code = WEXITSTATUS(status);
				if (!WIFEXITED(status) || WEXITSTATUS(status))
					status = HCHK_STATUS_PROCERR;
				else
					status = HCHK_STATUS_PROCOK;
			} else if (expired) {
				status = HCHK_STATUS_PROCTOUT;
				ha_warning("kill %d\n", (int)elem->pid);
				kill(elem->pid, SIGTERM);
			}
			set_server_check_status(check, status, NULL);
		}

		if (check->result == CHK_RES_FAILED) {
			/* a failure or timeout detected */
			check_notify_failure(check);
		}
		else if (check->result == CHK_RES_CONDPASS) {
			/* check is OK but asks for stopping mode */
			check_notify_stopping(check);
		}
		else if (check->result == CHK_RES_PASSED) {
			/* a success was detected */
			check_notify_success(check);
		}
		task_set_affinity(t, 1);
		check->state &= ~CHK_ST_INPROGRESS;

		pid_list_del(check->curpid);

		rv = 0;
		if (global.spread_checks > 0) {
			rv = srv_getinter(check) * global.spread_checks / 100;
			rv -= (int) (2 * rv * (ha_random32() / 4294967295.0));
		}
		t->expire = tick_add(now_ms, MS_TO_TICKS(srv_getinter(check) + rv));
	}

 reschedule:
	while (tick_is_expired(t->expire, now_ms))
		t->expire = tick_add(t->expire, MS_TO_TICKS(check->inter));

 out_unlock:
	HA_SPIN_UNLOCK(SERVER_LOCK, &check->server->lock);
	return t;
}


/**************************************************************************/
/***************** Health-checks based on connections *********************/
/**************************************************************************/
/* This function is used only for server health-checks. It handles connection
 * status updates including errors. If necessary, it wakes the check task up.
 * It returns 0 on normal cases, <0 if at least one close() has happened on the
 * connection (eg: reconnect). It relies on tcpcheck_main().
 */
static int wake_srv_chk(struct conn_stream *cs)
{
	struct connection *conn = cs->conn;
	struct check *check = cs->data;
	struct email_alertq *q = container_of(check, typeof(*q), check);
	int ret = 0;

	if (check->server)
		HA_SPIN_LOCK(SERVER_LOCK, &check->server->lock);
	else
		HA_SPIN_LOCK(EMAIL_ALERTS_LOCK, &q->lock);

	/* we may have to make progress on the TCP checks */
	ret = tcpcheck_main(check);

	cs = check->cs;
	conn = cs->conn;

	if (unlikely(conn->flags & CO_FL_ERROR || cs->flags & CS_FL_ERROR)) {
		/* We may get error reports bypassing the I/O handlers, typically
		 * the case when sending a pure TCP check which fails, then the I/O
		 * handlers above are not called. This is completely handled by the
		 * main processing task so let's simply wake it up. If we get here,
		 * we expect errno to still be valid.
		 */
		chk_report_conn_err(check, errno, 0);
		task_wakeup(check->task, TASK_WOKEN_IO);
	}

	if (check->result != CHK_RES_UNKNOWN) {
		/* Check complete or aborted. If connection not yet closed do it
		 * now and wake the check task up to be sure the result is
		 * handled ASAP. */
		conn_sock_drain(conn);
		cs_close(cs);
		ret = -1;
		/* We may have been scheduled to run, and the
		 * I/O handler expects to have a cs, so remove
		 * the tasklet
		 */
		tasklet_remove_from_tasklet_list(check->wait_list.tasklet);
		task_wakeup(check->task, TASK_WOKEN_IO);
	}

	if (check->server)
		HA_SPIN_UNLOCK(SERVER_LOCK, &check->server->lock);
	else
		HA_SPIN_UNLOCK(EMAIL_ALERTS_LOCK, &q->lock);

	/* if a connection got replaced, we must absolutely prevent the connection
	 * handler from touching its fd, and perform the FD polling updates ourselves
	 */
	if (ret < 0)
		conn_cond_update_polling(conn);

	return ret;
}

/* This function checks if any I/O is wanted, and if so, attempts to do so */
static struct task *event_srv_chk_io(struct task *t, void *ctx, unsigned short state)
{
	struct check *check = ctx;
	struct conn_stream *cs = check->cs;
	struct email_alertq *q = container_of(check, typeof(*q), check);
	int ret = 0;

	if (!(check->wait_list.events & SUB_RETRY_SEND))
		ret = wake_srv_chk(cs);
	if (ret == 0 && !(check->wait_list.events & SUB_RETRY_RECV)) {
		if (check->server)
			HA_SPIN_LOCK(SERVER_LOCK, &check->server->lock);
		else
			HA_SPIN_LOCK(EMAIL_ALERTS_LOCK, &q->lock);

		if (unlikely(check->result == CHK_RES_FAILED)) {
			/* collect possible new errors */
			if (cs->conn->flags & CO_FL_ERROR || cs->flags & CS_FL_ERROR)
				chk_report_conn_err(check, 0, 0);

			/* Reset the check buffer... */
			b_reset(&check->bi);

			/* Close the connection... We still attempt to nicely close if,
			 * for instance, SSL needs to send a "close notify." Later, we perform
			 * a hard close and reset the connection if some data are pending,
			 * otherwise we end up with many TIME_WAITs and eat all the source port
			 * range quickly.  To avoid sending RSTs all the time, we first try to
			 * drain pending data.
			 */
			/* Call cs_shutr() first, to add the CO_FL_SOCK_RD_SH flag on the
			 * connection, to make sure cs_shutw() will not lead to a shutdown()
			 * that would provoke TIME_WAITs.
			 */
			cs_shutr(cs, CS_SHR_DRAIN);
			cs_shutw(cs, CS_SHW_NORMAL);

			/* OK, let's not stay here forever */
			if (check->result == CHK_RES_FAILED)
				cs->conn->flags |= CO_FL_ERROR;

			task_wakeup(t, TASK_WOKEN_IO);
		}

		if (check->server)
			HA_SPIN_UNLOCK(SERVER_LOCK, &check->server->lock);
		else
			HA_SPIN_UNLOCK(EMAIL_ALERTS_LOCK, &q->lock);
	}
	return NULL;
}

/* manages a server health-check that uses a connection. Returns
 * the time the task accepts to wait, or TIME_ETERNITY for infinity.
 *
 * Please do NOT place any return statement in this function and only leave
 * via the out_unlock label.
 */
static struct task *process_chk_conn(struct task *t, void *context, unsigned short state)
{
	struct check *check = context;
	struct proxy *proxy = check->proxy;
	struct conn_stream *cs = check->cs;
	struct connection *conn = cs_conn(cs);
	int rv;
	int expired = tick_is_expired(t->expire, now_ms);

	if (check->server)
		HA_SPIN_LOCK(SERVER_LOCK, &check->server->lock);
	if (!(check->state & CHK_ST_INPROGRESS)) {
		/* no check currently running */
		if (!expired) /* woke up too early */
			goto out_unlock;

		/* we don't send any health-checks when the proxy is
		 * stopped, the server should not be checked or the check
		 * is disabled.
		 */
		if (((check->state & (CHK_ST_ENABLED | CHK_ST_PAUSED)) != CHK_ST_ENABLED) ||
		    proxy->state == PR_STSTOPPED)
			goto reschedule;

		/* we'll initiate a new check */
		set_server_check_status(check, HCHK_STATUS_START, NULL);

		check->state |= CHK_ST_INPROGRESS;
		b_reset(&check->bi);
		b_reset(&check->bo);

		task_set_affinity(t, tid_bit);
		cs = check->cs;
		conn = cs_conn(cs);
		if (!conn) {
			check->current_step = NULL;
			tcpcheck_main(check);
			goto out_unlock;
		}

		conn->flags |= CO_FL_ERROR;
		chk_report_conn_err(check, 0, 0);

		/* here, we have seen a synchronous error, no fd was allocated */
		task_set_affinity(t, MAX_THREADS_MASK);
		if (cs) {
			if (check->wait_list.events)
				cs->conn->xprt->unsubscribe(cs->conn,
				                            cs->conn->xprt_ctx,
							    check->wait_list.events,
							    &check->wait_list);
			/* We may have been scheduled to run, and the
			 * I/O handler expects to have a cs, so remove
			 * the tasklet
			 */
			tasklet_remove_from_tasklet_list(check->wait_list.tasklet);
			cs_destroy(cs);
			cs = check->cs = NULL;
			conn = NULL;
		}

		check->state &= ~CHK_ST_INPROGRESS;
		check_notify_failure(check);

		/* we allow up to min(inter, timeout.connect) for a connection
		 * to establish but only when timeout.check is set
		 * as it may be to short for a full check otherwise
		 */
		while (tick_is_expired(t->expire, now_ms)) {
			int t_con;

			t_con = tick_add(t->expire, proxy->timeout.connect);
			t->expire = tick_add(t->expire, MS_TO_TICKS(check->inter));
			if (proxy->timeout.check)
				t->expire = tick_first(t->expire, t_con);
		}
	}
	else {
		/* there was a test running.
		 * First, let's check whether there was an uncaught error,
		 * which can happen on connect timeout or error.
		 */
		if (check->result == CHK_RES_UNKNOWN) {
			if ((conn->flags & CO_FL_ERROR) || cs->flags & CS_FL_ERROR || expired) {
				chk_report_conn_err(check, 0, expired);
			}
			else
				goto out_unlock; /* timeout not reached, wait again */
		}

		/* check complete or aborted */

		check->current_step = NULL;
		if (check->sess != NULL) {
			session_free(check->sess);
			check->sess = NULL;
		}

		if (conn && conn->xprt) {
			/* The check was aborted and the connection was not yet closed.
			 * This can happen upon timeout, or when an external event such
			 * as a failed response coupled with "observe layer7" caused the
			 * server state to be suddenly changed.
			 */
			conn_sock_drain(conn);
			cs_close(cs);
		}

		if (cs) {
			if (check->wait_list.events)
				cs->conn->xprt->unsubscribe(cs->conn,
							    cs->conn->xprt_ctx,
							    check->wait_list.events,
							    &check->wait_list);
			/* We may have been scheduled to run, and the
			 * I/O handler expects to have a cs, so remove
			 * the tasklet
			 */
			tasklet_remove_from_tasklet_list(check->wait_list.tasklet);
			cs_destroy(cs);
			cs = check->cs = NULL;
			conn = NULL;
		}

		if (check->server) {
			if (check->result == CHK_RES_FAILED) {
				/* a failure or timeout detected */
				check_notify_failure(check);
			}
			else if (check->result == CHK_RES_CONDPASS) {
				/* check is OK but asks for stopping mode */
				check_notify_stopping(check);
			}
			else if (check->result == CHK_RES_PASSED) {
				/* a success was detected */
				check_notify_success(check);
			}
		}
		task_set_affinity(t, MAX_THREADS_MASK);
		check->state &= ~CHK_ST_INPROGRESS;

		if (check->server) {
			rv = 0;
			if (global.spread_checks > 0) {
				rv = srv_getinter(check) * global.spread_checks / 100;
				rv -= (int) (2 * rv * (ha_random32() / 4294967295.0));
			}
			t->expire = tick_add(now_ms, MS_TO_TICKS(srv_getinter(check) + rv));
		}
	}

 reschedule:
	while (tick_is_expired(t->expire, now_ms))
		t->expire = tick_add(t->expire, MS_TO_TICKS(check->inter));
 out_unlock:
	if (check->server)
		HA_SPIN_UNLOCK(SERVER_LOCK, &check->server->lock);
	return t;
}


/**************************************************************************/
/******************* Internals to parse tcp-check rules *******************/
/**************************************************************************/
struct action_kw_list tcp_check_keywords = {
	.list = LIST_HEAD_INIT(tcp_check_keywords.list),
};

/* Return the struct action_kw associated to a keyword */
static struct action_kw *action_kw_tcp_check_lookup(const char *kw)
{
	return action_lookup(&tcp_check_keywords.list, kw);
}

static void action_kw_tcp_check_build_list(struct buffer *chk)
{
	action_build_list(&tcp_check_keywords.list, chk);
}

/* Creates a tcp-check rule resulting from parsing a custom keyword. NULL is
 * returned on error.
 */
static struct tcpcheck_rule *parse_tcpcheck_action(char **args, int cur_arg, struct proxy *px,
						   struct list *rules, struct action_kw *kw,
						   const char *file, int line, char **errmsg)
{
	struct tcpcheck_rule *chk = NULL;
	struct act_rule *actrule = NULL;

	actrule = calloc(1, sizeof(*actrule));
	if (!actrule) {
		memprintf(errmsg, "out of memory");
		goto error;
	}
	actrule->kw = kw;
	actrule->from = ACT_F_TCP_CHK;

	cur_arg++;
	if (kw->parse((const char **)args, &cur_arg, px, actrule, errmsg) == ACT_RET_PRS_ERR) {
		memprintf(errmsg, "'%s' : %s", kw->kw, *errmsg);
		goto error;
	}

	chk = calloc(1, sizeof(*chk));
	if (!chk) {
		memprintf(errmsg, "out of memory");
		goto error;
	}
	chk->action = TCPCHK_ACT_ACTION_KW;
	chk->action_kw.rule = actrule;
	return chk;

  error:
	free(actrule);
	return NULL;
}

/* Parses and creates a tcp-check connect or an http-check connect rule. NULL is
 * returned on error.
 */
static struct tcpcheck_rule *parse_tcpcheck_connect(char **args, int cur_arg, struct proxy *px, struct list *rules,
						    const char *file, int line, char **errmsg)
{
	struct tcpcheck_rule *chk = NULL;
	struct sockaddr_storage *sk = NULL;
	char *comment = NULL, *sni = NULL, *alpn = NULL;
	struct sample_expr *port_expr = NULL;
	unsigned short conn_opts = 0;
	long port = 0;
	int alpn_len = 0;

	list_for_each_entry(chk, rules, list) {
		if (chk->action == TCPCHK_ACT_CONNECT)
			break;
		if (chk->action == TCPCHK_ACT_COMMENT ||
		    chk->action == TCPCHK_ACT_ACTION_KW ||
		    (chk->action == TCPCHK_ACT_SEND && (chk->send.http.flags & TCPCHK_SND_HTTP_FROM_OPT)))
			continue;

		memprintf(errmsg, "first step MUST also be a 'connect', "
			  "optionnaly preceded by a 'set-var', an 'unset-var' or a 'comment', "
			  "when there is a 'connect' step in the tcp-check ruleset");
		goto error;
	}

	cur_arg++;
	while (*(args[cur_arg])) {
		if (strcmp(args[cur_arg], "default") == 0)
			conn_opts |= TCPCHK_OPT_DEFAULT_CONNECT;
		else if (strcmp(args[cur_arg], "addr") == 0) {
			int port1, port2;
			struct protocol *proto;

			if (!*(args[cur_arg+1])) {
				memprintf(errmsg, "'%s' expects <ipv4|ipv6> as argument.", args[cur_arg]);
				goto error;
			}

			sk = str2sa_range(args[cur_arg+1], NULL, &port1, &port2, errmsg, NULL, NULL, 1);
			if (!sk) {
				memprintf(errmsg, "'%s' : %s.", args[cur_arg], *errmsg);
				goto error;
			}

			proto = protocol_by_family(sk->ss_family);
			if (!proto || !proto->connect) {
				memprintf(errmsg, "'%s' : connect() not supported for this address family.\n",
					  args[cur_arg]);
				goto error;
			}

			if (port1 != port2) {
				memprintf(errmsg, "'%s' : port ranges and offsets are not allowed in '%s'\n",
					  args[cur_arg], args[cur_arg+1]);
				goto error;
			}

			cur_arg++;
		}
		else if (strcmp(args[cur_arg], "port") == 0) {
			const char *p, *end;

			if (!*(args[cur_arg+1])) {
				memprintf(errmsg, "'%s' expects a port number or a sample expression as argument.", args[cur_arg]);
				goto error;
			}
			cur_arg++;

			port = 0;
			release_sample_expr(port_expr);
			p = args[cur_arg]; end = p + strlen(p);
			port = read_uint(&p, end);
			if (p != end) {
				int idx = 0;

				px->conf.args.ctx = ARGC_SRV;
				port_expr = sample_parse_expr((char *[]){args[cur_arg], NULL}, &idx,
							      file, line, errmsg, &px->conf.args, NULL);

				if (!port_expr) {
					memprintf(errmsg, "error detected while parsing port expression : %s", *errmsg);
					goto error;
				}
				if (!(port_expr->fetch->val & SMP_VAL_BE_CHK_RUL)) {
					memprintf(errmsg, "error detected while parsing port expression : "
						  " fetch method '%s' extracts information from '%s', "
						  "none of which is available here.\n",
						  args[cur_arg], sample_src_names(port_expr->fetch->use));
					goto error;
				}
				px->http_needed |= !!(port_expr->fetch->use & SMP_USE_HTTP_ANY);
			}
			else if (port > 65535 || port < 1) {
				memprintf(errmsg, "expects a valid TCP port (from range 1 to 65535) or a sample expression, got %s.",
					  args[cur_arg]);
				goto error;
			}
		}
		else if (strcmp(args[cur_arg], "comment") == 0) {
			if (!*(args[cur_arg+1])) {
				memprintf(errmsg, "'%s' expects a string as argument.", args[cur_arg]);
				goto error;
			}
			cur_arg++;
			free(comment);
			comment = strdup(args[cur_arg]);
			if (!comment) {
				memprintf(errmsg, "out of memory");
				goto error;
			}
		}
		else if (strcmp(args[cur_arg], "send-proxy") == 0)
			conn_opts |= TCPCHK_OPT_SEND_PROXY;
		else if (strcmp(args[cur_arg], "via-socks4") == 0)
			conn_opts |= TCPCHK_OPT_SOCKS4;
		else if (strcmp(args[cur_arg], "linger") == 0)
			conn_opts |= TCPCHK_OPT_LINGER;
#ifdef USE_OPENSSL
		else if (strcmp(args[cur_arg], "ssl") == 0) {
			px->options |= PR_O_TCPCHK_SSL;
			conn_opts |= TCPCHK_OPT_SSL;
		}
		else if (strcmp(args[cur_arg], "sni") == 0) {
			if (!*(args[cur_arg+1])) {
				memprintf(errmsg, "'%s' expects a string as argument.", args[cur_arg]);
				goto error;
			}
			cur_arg++;
			free(sni);
			sni = strdup(args[cur_arg]);
			if (!sni) {
				memprintf(errmsg, "out of memory");
				goto error;
			}
		}
		else if (strcmp(args[cur_arg], "alpn") == 0) {
#ifdef TLSEXT_TYPE_application_layer_protocol_negotiation
			free(alpn);
			if (ssl_sock_parse_alpn(args[cur_arg + 1], &alpn, &alpn_len, errmsg)) {
				memprintf(errmsg, "'%s' : %s", args[cur_arg], *errmsg);
				goto error;
			}
			cur_arg++;
#else
			memprintf(errmsg, "'%s' : library does not support TLS ALPN extension.", args[cur_arg]);
			goto error;
#endif
		}
#endif /* USE_OPENSSL */

		else {
			memprintf(errmsg, "expects 'comment', 'port', 'addr', 'send-proxy'"
#ifdef USE_OPENSSL
				  ", 'ssl', 'sni', 'alpn'"
#endif /* USE_OPENSSL */
				  " or 'via-socks4', 'linger', 'default' but got '%s' as argument.",
				  args[cur_arg]);
			goto error;
		}
		cur_arg++;
	}

	chk = calloc(1, sizeof(*chk));
	if (!chk) {
		memprintf(errmsg, "out of memory");
		goto error;
	}
	chk->action  = TCPCHK_ACT_CONNECT;
	chk->comment = comment;
	chk->connect.port    = port;
	chk->connect.options = conn_opts;
	chk->connect.sni     = sni;
	chk->connect.alpn    = alpn;
	chk->connect.alpn_len= alpn_len;
	chk->connect.port_expr= port_expr;
	if (sk)
		chk->connect.addr = *sk;
	return chk;

  error:
	free(alpn);
	free(sni);
	free(comment);
	release_sample_expr(port_expr);
	return NULL;
}

/* Parses and creates a tcp-check send rule. NULL is returned on error */
static struct tcpcheck_rule *parse_tcpcheck_send(char **args, int cur_arg, struct proxy *px, struct list *rules,
						 const char *file, int line, char **errmsg)
{
	struct tcpcheck_rule *chk = NULL;
	char *comment = NULL, *data = NULL;
	enum tcpcheck_send_type type = TCPCHK_SEND_UNDEF;

	type = ((strcmp(args[cur_arg], "send-binary") == 0) ? TCPCHK_SEND_BINARY : TCPCHK_SEND_STRING);
	if (!*(args[cur_arg+1])) {
		memprintf(errmsg, "'%s' expects a %s as argument",
			  (type == TCPCHK_SEND_BINARY ? "binary string": "string"), args[cur_arg]);
		goto error;
	}

	data = args[cur_arg+1];

	cur_arg += 2;
	while (*(args[cur_arg])) {
		if (strcmp(args[cur_arg], "comment") == 0) {
			if (!*(args[cur_arg+1])) {
				memprintf(errmsg, "'%s' expects a string as argument.", args[cur_arg]);
				goto error;
			}
			cur_arg++;
			free(comment);
			comment = strdup(args[cur_arg]);
			if (!comment) {
				memprintf(errmsg, "out of memory");
				goto error;
			}
		}
		else if (strcmp(args[cur_arg], "log-format") == 0) {
			if (type == TCPCHK_SEND_BINARY)
				type = TCPCHK_SEND_BINARY_LF;
			else if (type == TCPCHK_SEND_STRING)
				type = TCPCHK_SEND_STRING_LF;
		}
		else {
			memprintf(errmsg, "expects 'comment', 'log-format' but got '%s' as argument.",
				  args[cur_arg]);
			goto error;
		}
		cur_arg++;
	}

	chk = calloc(1, sizeof(*chk));
	if (!chk) {
		memprintf(errmsg, "out of memory");
		goto error;
	}
	chk->action      = TCPCHK_ACT_SEND;
	chk->comment     = comment;
	chk->send.type   = type;

	switch (chk->send.type) {
	case TCPCHK_SEND_STRING:
		chk->send.data = ist2(strdup(data), strlen(data));
		if (!isttest(chk->send.data)) {
			memprintf(errmsg, "out of memory");
			goto error;
		}
		break;
	case TCPCHK_SEND_BINARY:
		if (parse_binary(data, &chk->send.data.ptr, (int *)&chk->send.data.len, errmsg) == 0) {
			memprintf(errmsg, "'%s' invalid binary string (%s).\n", data, *errmsg);
			goto error;
		}
		break;
	case TCPCHK_SEND_STRING_LF:
	case TCPCHK_SEND_BINARY_LF:
		LIST_INIT(&chk->send.fmt);
		px->conf.args.ctx = ARGC_SRV;
		if (!parse_logformat_string(data, px, &chk->send.fmt, 0, SMP_VAL_BE_CHK_RUL, errmsg)) {
			memprintf(errmsg, "'%s' invalid log-format string (%s).\n", data, *errmsg);
			goto error;
		}
		break;
	case TCPCHK_SEND_HTTP:
	case TCPCHK_SEND_UNDEF:
		goto error;
	}

	return chk;

  error:
	free(chk);
	free(comment);
	return NULL;
}

/* Parses and creates a http-check send rule. NULL is returned on error */
static struct tcpcheck_rule *parse_tcpcheck_send_http(char **args, int cur_arg, struct proxy *px, struct list *rules,
						      const char *file, int line, char **errmsg)
{
	struct tcpcheck_rule *chk = NULL;
	struct tcpcheck_http_hdr *hdr = NULL;
        struct http_hdr hdrs[global.tune.max_http_hdr];
	char *meth = NULL, *uri = NULL, *vsn = NULL;
	char *body = NULL, *comment = NULL;
	unsigned int flags = 0;
	int i = 0;

	cur_arg++;
	while (*(args[cur_arg])) {
		if (strcmp(args[cur_arg], "meth") == 0) {
			if (!*(args[cur_arg+1])) {
				memprintf(errmsg, "'%s' expects a string as argument.", args[cur_arg]);
				goto error;
			}
			cur_arg++;
			meth = args[cur_arg];
		}
		else if (strcmp(args[cur_arg], "uri") == 0) {
			if (!*(args[cur_arg+1])) {
				memprintf(errmsg, "'%s' expects a string as argument.", args[cur_arg]);
				goto error;
			}
			cur_arg++;
			uri = args[cur_arg];
			// TODO: log-format uri
		}
		else if (strcmp(args[cur_arg], "vsn") == 0) {
			if (!*(args[cur_arg+1])) {
				memprintf(errmsg, "'%s' expects a string as argument.", args[cur_arg]);
				goto error;
			}
			cur_arg++;
			vsn = args[cur_arg];
		}
                else if (strcmp(args[cur_arg], "hdr") == 0) {
			if (!*args[cur_arg+1] || !*args[cur_arg+2]) {
				memprintf(errmsg, "'%s' expects <name> and <value> as arguments", args[cur_arg]);
				goto error;
			}
			hdrs[i].n = ist2(args[cur_arg+1], strlen(args[cur_arg+1]));
			hdrs[i].v = ist2(args[cur_arg+2], strlen(args[cur_arg+2]));
			i++;
			cur_arg += 2;
		}
		else if (strcmp(args[cur_arg], "body") == 0) {
			if (!*(args[cur_arg+1])) {
				memprintf(errmsg, "'%s' expects a string as argument.", args[cur_arg]);
				goto error;
			}
			cur_arg++;
			body = args[cur_arg];
			// TODO: log-format body
		}
		else if (strcmp(args[cur_arg], "comment") == 0) {
			if (!*(args[cur_arg+1])) {
				memprintf(errmsg, "'%s' expects a string as argument.", args[cur_arg]);
				goto error;
			}
			cur_arg++;
			free(comment);
			comment = strdup(args[cur_arg]);
			if (!comment) {
				memprintf(errmsg, "out of memory");
				goto error;
			}
		}
		else {
			memprintf(errmsg, "expects 'comment', 'meth', 'uri', 'hdr' and 'body' but got '%s' as argument.",
				  args[cur_arg]);
			goto error;
		}
		cur_arg++;
	}

	hdrs[i].n = hdrs[i].v = IST_NULL;

	chk = calloc(1, sizeof(*chk));
	if (!chk) {
		memprintf(errmsg, "out of memory");
		goto error;
	}
	chk->action    = TCPCHK_ACT_SEND;
	chk->comment   = comment; comment = NULL;
	chk->send.type = TCPCHK_SEND_HTTP;
	chk->send.http.flags = flags;
	LIST_INIT(&chk->send.http.hdrs);

	if (meth) {
		chk->send.http.meth.meth = find_http_meth(meth, strlen(meth));
		chk->send.http.meth.str.area = strdup(meth);
		chk->send.http.meth.str.data = strlen(meth);
		if (!chk->send.http.meth.str.area) {
			memprintf(errmsg, "out of memory");
			goto error;
		}
	}
	if (uri) {
		chk->send.http.uri = ist2(strdup(uri), strlen(uri));
		if (!isttest(chk->send.http.uri)) {
			memprintf(errmsg, "out of memory");
			goto error;
		}
	}
	if (vsn) {
		chk->send.http.vsn = ist2(strdup(vsn), strlen(vsn));
		if (!isttest(chk->send.http.vsn)) {
			memprintf(errmsg, "out of memory");
			goto error;
		}
	}
	for (i = 0; istlen(hdrs[i].n); i++) {
		hdr = calloc(1, sizeof(*hdr));
		if (!hdr) {
			memprintf(errmsg, "out of memory");
			goto error;
		}
		LIST_INIT(&hdr->value);
		hdr->name = istdup(hdrs[i].n);
		if (!isttest(hdr->name)) {
			memprintf(errmsg, "out of memory");
			goto error;
		}

		ist0(hdrs[i].v);
		if (!parse_logformat_string(istptr(hdrs[i].v), px, &hdr->value, 0, SMP_VAL_BE_CHK_RUL, errmsg))
			goto error;
		LIST_ADDQ(&chk->send.http.hdrs, &hdr->list);
		hdr = NULL;
	}

	if (body) {
		chk->send.http.body = ist2(strdup(body), strlen(body));
		if (!isttest(chk->send.http.body)) {
			memprintf(errmsg, "out of memory");
			goto error;
		}
	}

	return chk;

  error:
	free_tcpcheck_http_hdr(hdr);
	free_tcpcheck(chk, 0);
	free(comment);
	return NULL;
}

/* Parses and creates a http-check comment rule. NULL is returned on error */
static struct tcpcheck_rule *parse_tcpcheck_comment(char **args, int cur_arg, struct proxy *px, struct list *rules,
						    const char *file, int line, char **errmsg)
{
	struct tcpcheck_rule *chk = NULL;
	char *comment = NULL;

	if (!*(args[cur_arg+1])) {
		memprintf(errmsg, "expects a string as argument");
		goto error;
	}
	cur_arg++;
	comment = strdup(args[cur_arg]);
	if (!comment) {
		memprintf(errmsg, "out of memory");
		goto error;
	}

	chk = calloc(1, sizeof(*chk));
	if (!chk) {
		memprintf(errmsg, "out of memory");
		goto error;
	}
	chk->action  = TCPCHK_ACT_COMMENT;
	chk->comment = comment;
	return chk;

  error:
	free(comment);
	return NULL;
}

/* Parses and creates a tcp-check or an http-check expect rule. NULL is returned
 * on error. <proto> is set to the right protocol flags (covered by the
 * TCPCHK_RULES_PROTO_CHK mask).
 */
static struct tcpcheck_rule *parse_tcpcheck_expect(char **args, int cur_arg, struct proxy *px,
						   struct list *rules, unsigned int proto,
						   const char *file, int line, char **errmsg)
{
	struct tcpcheck_rule *prev_check, *chk = NULL;
	struct sample_expr *status_expr = NULL;
	char *str, *on_success_msg, *on_error_msg, *comment, *pattern;
	enum tcpcheck_expect_type type = TCPCHK_EXPECT_UNDEF;
	enum healthcheck_status ok_st = HCHK_STATUS_L7OKD;
	enum healthcheck_status err_st = HCHK_STATUS_L7RSP;
	enum healthcheck_status tout_st = HCHK_STATUS_L7TOUT;
	long min_recv = -1;
	int inverse = 0;

	str = on_success_msg = on_error_msg = comment = pattern = NULL;
	if (!*(args[cur_arg+1])) {
		memprintf(errmsg, "expects at least a matching pattern as arguments");
		goto error;
	}

	cur_arg++;
	while (*(args[cur_arg])) {
		int in_pattern = 0;

	  rescan:
		if (strcmp(args[cur_arg], "min-recv") == 0) {
			if (in_pattern) {
				memprintf(errmsg, "[!] not supported with '%s'", args[cur_arg]);
				goto error;
			}
			if (!*(args[cur_arg+1])) {
				memprintf(errmsg, "'%s' expects a integer as argument", args[cur_arg]);
				goto error;
			}
			/* Use an signed integer here because of chksize */
			cur_arg++;
			min_recv = atol(args[cur_arg]);
			if (min_recv < -1 || min_recv > INT_MAX) {
				memprintf(errmsg, "'%s' expects -1 or an integer from 0 to INT_MAX" , args[cur_arg-1]);
				goto error;
			}
		}
		else if (*(args[cur_arg]) == '!') {
			in_pattern = 1;
			while (*(args[cur_arg]) == '!') {
				inverse = !inverse;
				args[cur_arg]++;
			}
			if (!*(args[cur_arg]))
				cur_arg++;
			goto rescan;
		}
		else if (strcmp(args[cur_arg], "string") == 0 || strcmp(args[cur_arg], "rstring") == 0) {
			if (type != TCPCHK_EXPECT_UNDEF) {
				memprintf(errmsg, "only on pattern expected");
				goto error;
			}
			if (proto != TCPCHK_RULES_HTTP_CHK)
				type = ((*(args[cur_arg]) == 's') ? TCPCHK_EXPECT_STRING : TCPCHK_EXPECT_REGEX);
			else
				type = ((*(args[cur_arg]) == 's') ? TCPCHK_EXPECT_HTTP_BODY : TCPCHK_EXPECT_HTTP_REGEX_BODY);

			if (!*(args[cur_arg+1])) {
				memprintf(errmsg, "'%s' expects a <pattern> as argument", args[cur_arg]);
				goto error;
			}
			cur_arg++;
			pattern = args[cur_arg];
		}
		else if (strcmp(args[cur_arg], "binary") == 0 || strcmp(args[cur_arg], "rbinary") == 0) {
			if (proto == TCPCHK_RULES_HTTP_CHK)
				goto bad_http_kw;
			if (type != TCPCHK_EXPECT_UNDEF) {
				memprintf(errmsg, "only on pattern expected");
				goto error;
			}
			type = ((*(args[cur_arg]) == 'b') ?  TCPCHK_EXPECT_BINARY : TCPCHK_EXPECT_REGEX_BINARY);

			if (!*(args[cur_arg+1])) {
				memprintf(errmsg, "'%s' expects a <pattern> as argument", args[cur_arg]);
				goto error;
			}
			cur_arg++;
			pattern = args[cur_arg];
		}
		else if (strcmp(args[cur_arg], "status") == 0 || strcmp(args[cur_arg], "rstatus") == 0) {
			if (proto != TCPCHK_RULES_HTTP_CHK)
				goto bad_tcp_kw;
			if (type != TCPCHK_EXPECT_UNDEF) {
				memprintf(errmsg, "only on pattern expected");
				goto error;
			}
			type = ((*(args[cur_arg]) == 's') ? TCPCHK_EXPECT_HTTP_STATUS : TCPCHK_EXPECT_HTTP_REGEX_STATUS);

			if (!*(args[cur_arg+1])) {
				memprintf(errmsg, "'%s' expects a <pattern> as argument", args[cur_arg]);
				goto error;
			}
			cur_arg++;
			pattern = args[cur_arg];
		}
		else if (strcmp(args[cur_arg], "custom") == 0) {
			if (in_pattern) {
				memprintf(errmsg, "[!] not supported with '%s'", args[cur_arg]);
				goto error;
			}
			if (type != TCPCHK_EXPECT_UNDEF) {
				memprintf(errmsg, "only on pattern expected");
				goto error;
			}
			type = TCPCHK_EXPECT_CUSTOM;
		}
		else if (strcmp(args[cur_arg], "comment") == 0) {
			if (in_pattern) {
				memprintf(errmsg, "[!] not supported with '%s'", args[cur_arg]);
				goto error;
			}
			if (!*(args[cur_arg+1])) {
				memprintf(errmsg, "'%s' expects a string as argument", args[cur_arg]);
				goto error;
			}
			cur_arg++;
			free(comment);
			comment = strdup(args[cur_arg]);
			if (!comment) {
				memprintf(errmsg, "out of memory");
				goto error;
			}
		}
		else if (strcmp(args[cur_arg], "on-success") == 0) {
			if (in_pattern) {
				memprintf(errmsg, "[!] not supported with '%s'", args[cur_arg]);
				goto error;
			}
			if (!*(args[cur_arg+1])) {
				memprintf(errmsg, "'%s' expects a string as argument", args[cur_arg]);
				goto error;
			}
			cur_arg++;
			free(on_success_msg);
			on_success_msg = strdup(args[cur_arg]);
			if (!on_success_msg) {
				memprintf(errmsg, "out of memory");
				goto error;
			}
		}
		else if (strcmp(args[cur_arg], "on-error") == 0) {
			if (in_pattern) {
				memprintf(errmsg, "[!] not supported with '%s'", args[cur_arg]);
				goto error;
			}
			if (!*(args[cur_arg+1])) {
				memprintf(errmsg, "'%s' expects a string as argument", args[cur_arg]);
				goto error;
			}
			cur_arg++;
			free(on_error_msg);
			on_error_msg = strdup(args[cur_arg]);
			if (!on_error_msg) {
				memprintf(errmsg, "out of memory");
				goto error;
			}
		}
		else if (strcmp(args[cur_arg], "ok-status") == 0) {
			if (in_pattern) {
				memprintf(errmsg, "[!] not supported with '%s'", args[cur_arg]);
				goto error;
			}
			if (!*(args[cur_arg+1])) {
				memprintf(errmsg, "'%s' expects a string as argument", args[cur_arg]);
				goto error;
			}
			if (strcasecmp(args[cur_arg+1], "L7OK") == 0)
				ok_st = HCHK_STATUS_L7OKD;
			else if (strcasecmp(args[cur_arg+1], "L7OKC") == 0)
				ok_st = HCHK_STATUS_L7OKCD;
			else if (strcasecmp(args[cur_arg+1], "L6OK") == 0)
				ok_st = HCHK_STATUS_L6OK;
			else if (strcasecmp(args[cur_arg+1], "L4OK") == 0)
				ok_st = HCHK_STATUS_L4OK;
			else  {
				memprintf(errmsg, "'%s' only supports 'L4OK', 'L6OK', 'L7OK' or 'L7OKC' status (got '%s').",
					  args[cur_arg], args[cur_arg+1]);
				goto error;
			}
			cur_arg++;
		}
		else if (strcmp(args[cur_arg], "error-status") == 0) {
			if (in_pattern) {
				memprintf(errmsg, "[!] not supported with '%s'", args[cur_arg]);
				goto error;
			}
			if (!*(args[cur_arg+1])) {
				memprintf(errmsg, "'%s' expects a string as argument", args[cur_arg]);
				goto error;
			}
			if (strcasecmp(args[cur_arg+1], "L7RSP") == 0)
				err_st = HCHK_STATUS_L7RSP;
			else if (strcasecmp(args[cur_arg+1], "L7STS") == 0)
				err_st = HCHK_STATUS_L7STS;
			else if (strcasecmp(args[cur_arg+1], "L6RSP") == 0)
				err_st = HCHK_STATUS_L6RSP;
			else if (strcasecmp(args[cur_arg+1], "L4CON") == 0)
				err_st = HCHK_STATUS_L4CON;
			else  {
				memprintf(errmsg, "'%s' only supports 'L4CON', 'L6RSP', 'L7RSP' or 'L7STS' status (got '%s').",
					  args[cur_arg], args[cur_arg+1]);
				goto error;
			}
			cur_arg++;
		}
		else if (strcmp(args[cur_arg], "status-code") == 0) {
			int idx = 0;

			if (in_pattern) {
				memprintf(errmsg, "[!] not supported with '%s'", args[cur_arg]);
				goto error;
			}
			if (!*(args[cur_arg+1])) {
				memprintf(errmsg, "'%s' expects an expression as argument", args[cur_arg]);
				goto error;
			}

			cur_arg++;
			release_sample_expr(status_expr);
			px->conf.args.ctx = ARGC_SRV;
			status_expr = sample_parse_expr((char *[]){args[cur_arg], NULL}, &idx,
							file, line, errmsg, &px->conf.args, NULL);
			if (!status_expr) {
				memprintf(errmsg, "error detected while parsing status-code expression : %s", *errmsg);
				goto error;
			}
			if (!(status_expr->fetch->val & SMP_VAL_BE_CHK_RUL)) {
				memprintf(errmsg, "error detected while parsing status-code expression : "
					  " fetch method '%s' extracts information from '%s', "
					  "none of which is available here.\n",
					  args[cur_arg], sample_src_names(status_expr->fetch->use));
					goto error;
			}
			px->http_needed |= !!(status_expr->fetch->use & SMP_USE_HTTP_ANY);
		}
		else if (strcmp(args[cur_arg], "tout-status") == 0) {
			if (in_pattern) {
				memprintf(errmsg, "[!] not supported with '%s'", args[cur_arg]);
				goto error;
			}
			if (!*(args[cur_arg+1])) {
				memprintf(errmsg, "'%s' expects a string as argument", args[cur_arg]);
				goto error;
			}
			if (strcasecmp(args[cur_arg+1], "L7TOUT") == 0)
				tout_st = HCHK_STATUS_L7TOUT;
			else if (strcasecmp(args[cur_arg+1], "L6TOUT") == 0)
				tout_st = HCHK_STATUS_L6TOUT;
			else if (strcasecmp(args[cur_arg+1], "L4TOUT") == 0)
				tout_st = HCHK_STATUS_L4TOUT;
			else  {
				memprintf(errmsg, "'%s' only supports 'L4TOUT', 'L6TOUT' or 'L7TOUT' status (got '%s').",
					  args[cur_arg], args[cur_arg+1]);
				goto error;
			}
			cur_arg++;
		}
		else {
			if (proto == TCPCHK_RULES_HTTP_CHK) {
			  bad_http_kw:
				memprintf(errmsg, "'only supports min-recv, [!]string', '[!]rstring', '[!]status', '[!]rstatus'"
					  " or comment but got '%s' as argument.", args[cur_arg]);
			}
			else {
			  bad_tcp_kw:
				memprintf(errmsg, "'only supports min-recv, '[!]binary', '[!]string', '[!]rstring', '[!]rbinary'"
					  " or comment but got '%s' as argument.", args[cur_arg]);
			}
			goto error;
		}

		cur_arg++;
	}

	chk = calloc(1, sizeof(*chk));
	if (!chk) {
		memprintf(errmsg, "out of memory");
		goto error;
	}
	chk->action  = TCPCHK_ACT_EXPECT;
	LIST_INIT(&chk->expect.onerror_fmt);
	LIST_INIT(&chk->expect.onsuccess_fmt);
	chk->comment = comment; comment = NULL;
	chk->expect.type = type;
	chk->expect.min_recv = min_recv;
	chk->expect.flags |= (inverse ? TCPCHK_EXPT_FL_INV : 0);
	chk->expect.ok_status = ok_st;
	chk->expect.err_status = err_st;
	chk->expect.tout_status = tout_st;
	chk->expect.status_expr = status_expr; status_expr = NULL;

	if (on_success_msg) {
		px->conf.args.ctx = ARGC_SRV;
		if (!parse_logformat_string(on_success_msg, px, &chk->expect.onsuccess_fmt, 0, SMP_VAL_BE_CHK_RUL, errmsg)) {
			memprintf(errmsg, "'%s' invalid log-format string (%s).\n", on_success_msg, *errmsg);
			goto error;
		}
		free(on_success_msg);
		on_success_msg = NULL;
	}
	if (on_error_msg) {
		px->conf.args.ctx = ARGC_SRV;
		if (!parse_logformat_string(on_error_msg, px, &chk->expect.onerror_fmt, 0, SMP_VAL_BE_CHK_RUL, errmsg)) {
			memprintf(errmsg, "'%s' invalid log-format string (%s).\n", on_error_msg, *errmsg);
			goto error;
		}
		free(on_error_msg);
		on_error_msg = NULL;
	}

	switch (chk->expect.type) {
	case TCPCHK_EXPECT_STRING:
	case TCPCHK_EXPECT_HTTP_STATUS:
	case TCPCHK_EXPECT_HTTP_BODY:
		chk->expect.data = ist2(strdup(pattern), strlen(pattern));
		if (!isttest(chk->expect.data)) {
			memprintf(errmsg, "out of memory");
			goto error;
		}
		break;
	case TCPCHK_EXPECT_BINARY:
		if (parse_binary(pattern, &chk->expect.data.ptr, (int *)&chk->expect.data.len, errmsg) == 0) {
			memprintf(errmsg, "invalid binary string (%s)", *errmsg);
			goto error;
		}
	case TCPCHK_EXPECT_REGEX:
	case TCPCHK_EXPECT_REGEX_BINARY:
	case TCPCHK_EXPECT_HTTP_REGEX_STATUS:
	case TCPCHK_EXPECT_HTTP_REGEX_BODY:
		chk->expect.regex = regex_comp(pattern, 1, 0, errmsg);
		if (!chk->expect.regex)
			goto error;
		break;
	case TCPCHK_EXPECT_CUSTOM:
		chk->expect.custom = NULL; /* Must be defined by the caller ! */
		break;
	case TCPCHK_EXPECT_UNDEF:
		free(chk);
		memprintf(errmsg, "pattern not found");
		goto error;
	}

	/* All tcp-check expect points back to the first inverse expect rule in
	 * a chain of one or more expect rule, potentially itself.
	 */
	chk->expect.head = chk;
	list_for_each_entry_rev(prev_check, rules, list) {
		if (prev_check->action == TCPCHK_ACT_EXPECT) {
			if (prev_check->expect.flags & TCPCHK_EXPT_FL_INV)
				chk->expect.head = prev_check;
			continue;
		}
		if (prev_check->action != TCPCHK_ACT_COMMENT && prev_check->action != TCPCHK_ACT_ACTION_KW)
			break;
	}
	return chk;

  error:
	free_tcpcheck(chk, 0);
	free(str);
	free(comment);
	free(on_success_msg);
	free(on_error_msg);
	release_sample_expr(status_expr);
	return NULL;
}

/* Overwrites fields of the old http send rule with those of the new one. When
 * replaced, old values are freed and replaced by the new ones. New values are
 * not copied but transferred. At the end <new> should be empty and can be
 * safely released. This function never fails.
 */
static void tcpcheck_overwrite_send_http_rule(struct tcpcheck_rule *old, struct tcpcheck_rule *new)
{
	struct logformat_node *lf, *lfb;
	struct tcpcheck_http_hdr *hdr, *bhdr;


	if (new->send.http.meth.str.area) {
		free(old->send.http.meth.str.area);
		old->send.http.meth.meth = new->send.http.meth.meth;
		old->send.http.meth.str.area = new->send.http.meth.str.area;
		old->send.http.meth.str.data = new->send.http.meth.str.data;
		new->send.http.meth.str = BUF_NULL;
	}

	if (!(new->send.http.flags & TCPCHK_SND_HTTP_FL_URI_FMT) && isttest(new->send.http.uri)) {
		if (!(old->send.http.flags & TCPCHK_SND_HTTP_FL_URI_FMT))
			istfree(&old->send.http.uri);
		else
			free_tcpcheck_fmt(&old->send.http.uri_fmt);
		old->send.http.flags &= ~TCPCHK_SND_HTTP_FL_URI_FMT;
		old->send.http.uri = new->send.http.uri;
		new->send.http.uri = IST_NULL;
	}
	else if ((new->send.http.flags & TCPCHK_SND_HTTP_FL_URI_FMT) && !LIST_ISEMPTY(&new->send.http.uri_fmt)) {
		if (!(old->send.http.flags & TCPCHK_SND_HTTP_FL_URI_FMT))
			istfree(&old->send.http.uri);
		else
			free_tcpcheck_fmt(&old->send.http.uri_fmt);
		old->send.http.flags |= TCPCHK_SND_HTTP_FL_URI_FMT;
		LIST_INIT(&old->send.http.uri_fmt);
		list_for_each_entry_safe(lf, lfb, &new->send.http.uri_fmt, list) {
			LIST_DEL(&lf->list);
			LIST_ADDQ(&old->send.http.uri_fmt, &lf->list);
		}
	}

	if (isttest(new->send.http.vsn)) {
		istfree(&old->send.http.vsn);
		old->send.http.vsn = new->send.http.vsn;
		new->send.http.vsn = IST_NULL;
	}

	free_tcpcheck_http_hdrs(&old->send.http.hdrs);
	list_for_each_entry_safe(hdr, bhdr, &new->send.http.hdrs, list) {
		LIST_DEL(&hdr->list);
		LIST_ADDQ(&old->send.http.hdrs, &hdr->list);
	}

	if (!(new->send.http.flags & TCPCHK_SND_HTTP_FL_BODY_FMT) && isttest(new->send.http.body)) {
		if (!(old->send.http.flags & TCPCHK_SND_HTTP_FL_BODY_FMT))
			istfree(&old->send.http.body);
		else
			free_tcpcheck_fmt(&old->send.http.body_fmt);
		old->send.http.flags &= ~TCPCHK_SND_HTTP_FL_BODY_FMT;
		old->send.http.body = new->send.http.body;
		new->send.http.body = IST_NULL;
	}
	else if ((new->send.http.flags & TCPCHK_SND_HTTP_FL_BODY_FMT) && !LIST_ISEMPTY(&new->send.http.body_fmt)) {
		if (!(old->send.http.flags & TCPCHK_SND_HTTP_FL_BODY_FMT))
			istfree(&old->send.http.body);
		else
			free_tcpcheck_fmt(&old->send.http.body_fmt);
		old->send.http.flags |= TCPCHK_SND_HTTP_FL_BODY_FMT;
		LIST_INIT(&old->send.http.body_fmt);
		list_for_each_entry_safe(lf, lfb, &new->send.http.body_fmt, list) {
			LIST_DEL(&lf->list);
			LIST_ADDQ(&old->send.http.body_fmt, &lf->list);
		}
	}
}

/* Internal function used to add an http-check rule in a list during the config
 * parsing step. Depending on its type, and the previously inserted rules, a
 * specific action may be performed or an error may be reported. This functions
 * returns 1 on success and 0 on error and <errmsg> is filled with the error
 * message.
 */
static int tcpcheck_add_http_rule(struct tcpcheck_rule *chk, struct tcpcheck_rules *rules, char **errmsg)
{
	struct tcpcheck_rule *r;

	/* the implicit send rule coming from an "option httpchk" line must be
	 * merged with the first explici http-check send rule, if
	 * any. Depdending the declaration order some tests are required.
	 *
	 * Some tests is also required for other kinds of http-check rules to be
	 * sure the ruleset remains valid.
	 */

	if (chk->action == TCPCHK_ACT_SEND && (chk->send.http.flags & TCPCHK_SND_HTTP_FROM_OPT)) {
		/* Tries to add an implcit http-check send rule from an "option httpchk" line.
		 * First, the first rule is retrieved, skipping the first CONNECT, if any, and
		 * following tests are performed :
		 *
		 *  1- If there is no such rule or if it is not a send rule, the implicit send
		 *     rule is pushed in front of the ruleset
		 *
		 *  2- If it is another implicit send rule, it is replaced with the new one.
		 *
		 *  3- Otherwise, it means it is an explicit send rule. In this case we merge
		 *     both, overwritting the old send rule (the explicit one) with info of the
		 *     new send rule (the implicit one).
		 */
		r = get_first_tcpcheck_rule(rules);
		if (r && r->action == TCPCHK_ACT_CONNECT)
			r = get_next_tcpcheck_rule(rules, r);
		if (!r || r->action != TCPCHK_ACT_SEND)
			LIST_ADD(rules->list, &chk->list);
		else if (r->send.http.flags & TCPCHK_SND_HTTP_FROM_OPT) {
			LIST_DEL(&r->list);
			free_tcpcheck(r, 0);
			LIST_ADD(rules->list, &chk->list);
		}
		else {
			tcpcheck_overwrite_send_http_rule(r, chk);
			free_tcpcheck(chk, 0);
		}
	}
	else {
		/* Tries to add an explicit http-check rule. First of all we check the typefo the
		 * last inserted rule to be sure it is valid. Then for send rule, we try to merge it
		 * with an existing implicit send rule, if any. At the end, if there is no error,
		 * the rule is appended to the list.
		 */

		r = get_last_tcpcheck_rule(rules);
		if (!r || (r->action == TCPCHK_ACT_SEND && (r->send.http.flags & TCPCHK_SND_HTTP_FROM_OPT)))
			/* no error */;
		else if (r->action != TCPCHK_ACT_CONNECT && chk->action == TCPCHK_ACT_SEND) {
			memprintf(errmsg, "unable to add http-check send rule at step %d (missing connect rule).",
				  chk->index+1);
			return 0;
		}
		else if (r->action != TCPCHK_ACT_SEND && chk->action == TCPCHK_ACT_EXPECT) {
			memprintf(errmsg, "unable to add http-check expect rule at step %d (missing send rule).",
				  chk->index+1);
			return 0;
		}
		else if (r->action != TCPCHK_ACT_EXPECT && chk->action == TCPCHK_ACT_CONNECT) {
			memprintf(errmsg, "unable to add http-check connect rule at step %d (missing expect rule).",
				  chk->index+1);
			return 0;
		}

		if (chk->action == TCPCHK_ACT_SEND) {
			r = get_first_tcpcheck_rule(rules);
			if (r && r->action == TCPCHK_ACT_SEND && (r->send.http.flags & TCPCHK_SND_HTTP_FROM_OPT)) {
				tcpcheck_overwrite_send_http_rule(r, chk);
				free_tcpcheck(chk, 0);
				LIST_DEL(&r->list);
				r->send.http.flags &= ~TCPCHK_SND_HTTP_FROM_OPT;
				chk = r;
			}
		}
		LIST_ADDQ(rules->list, &chk->list);
	}
	return 1;
}

/**************************************************************************/
/************************** Init/deinit checks ****************************/
/**************************************************************************/
static const char *init_check(struct check *check, int type)
{
	check->type = type;

	b_reset(&check->bi); check->bi.size = global.tune.chksize;
	b_reset(&check->bo); check->bo.size = global.tune.chksize;

	check->bi.area = calloc(check->bi.size, sizeof(char));
	check->bo.area = calloc(check->bo.size, sizeof(char));

	if (!check->bi.area || !check->bo.area)
		return "out of memory while allocating check buffer";

	check->wait_list.tasklet = tasklet_new();
	if (!check->wait_list.tasklet)
		return "out of memory while allocating check tasklet";
	check->wait_list.events = 0;
	check->wait_list.tasklet->process = event_srv_chk_io;
	check->wait_list.tasklet->context = check;
	return NULL;
}

void free_check(struct check *check)
{
	task_destroy(check->task);
	if (check->wait_list.tasklet)
		tasklet_free(check->wait_list.tasklet);

	free(check->bi.area);
	free(check->bo.area);
	if (check->cs) {
		free(check->cs->conn);
		check->cs->conn = NULL;
		cs_free(check->cs);
		check->cs = NULL;
	}
}

/* manages a server health-check. Returns the time the task accepts to wait, or
 * TIME_ETERNITY for infinity.
 */
static struct task *process_chk(struct task *t, void *context, unsigned short state)
{
	struct check *check = context;

	if (check->type == PR_O2_EXT_CHK)
		return process_chk_proc(t, context, state);
	return process_chk_conn(t, context, state);

}


static int start_check_task(struct check *check, int mininter,
			    int nbcheck, int srvpos)
{
	struct task *t;
	unsigned long thread_mask = MAX_THREADS_MASK;

	if (check->type == PR_O2_EXT_CHK)
		thread_mask = 1;

	/* task for the check */
	if ((t = task_new(thread_mask)) == NULL) {
		ha_alert("Starting [%s:%s] check: out of memory.\n",
			 check->server->proxy->id, check->server->id);
		return 0;
	}

	check->task = t;
	t->process = process_chk;
	t->context = check;

	if (mininter < srv_getinter(check))
		mininter = srv_getinter(check);

	if (global.max_spread_checks && mininter > global.max_spread_checks)
		mininter = global.max_spread_checks;

	/* check this every ms */
	t->expire = tick_add(now_ms, MS_TO_TICKS(mininter * srvpos / nbcheck));
	check->start = now;
	task_queue(t);

	return 1;
}

/* updates the server's weight during a warmup stage. Once the final weight is
 * reached, the task automatically stops. Note that any server status change
 * must have updated s->last_change accordingly.
 */
static struct task *server_warmup(struct task *t, void *context, unsigned short state)
{
	struct server *s = context;

	/* by default, plan on stopping the task */
	t->expire = TICK_ETERNITY;
	if ((s->next_admin & SRV_ADMF_MAINT) ||
	    (s->next_state != SRV_ST_STARTING))
		return t;

	HA_SPIN_LOCK(SERVER_LOCK, &s->lock);

	/* recalculate the weights and update the state */
	server_recalc_eweight(s, 1);

	/* probably that we can refill this server with a bit more connections */
	pendconn_grab_from_px(s);

	HA_SPIN_UNLOCK(SERVER_LOCK, &s->lock);

	/* get back there in 1 second or 1/20th of the slowstart interval,
	 * whichever is greater, resulting in small 5% steps.
	 */
	if (s->next_state == SRV_ST_STARTING)
		t->expire = tick_add(now_ms, MS_TO_TICKS(MAX(1000, s->slowstart / 20)));
	return t;
}

/*
 * Start health-check.
 * Returns 0 if OK, ERR_FATAL on error, and prints the error in this case.
 */
static int start_checks()
{

	struct proxy *px;
	struct server *s;
	struct task *t;
	int nbcheck=0, mininter=0, srvpos=0;

	/* 0- init the dummy frontend used to create all checks sessions */
	init_new_proxy(&checks_fe);
	checks_fe.cap = PR_CAP_FE | PR_CAP_BE;
        checks_fe.mode = PR_MODE_TCP;
	checks_fe.maxconn = 0;
	checks_fe.conn_retries = CONN_RETRIES;
	checks_fe.options2 |= PR_O2_INDEPSTR | PR_O2_SMARTCON | PR_O2_SMARTACC;
	checks_fe.timeout.client = TICK_ETERNITY;

	/* 1- count the checkers to run simultaneously.
	 * We also determine the minimum interval among all of those which
	 * have an interval larger than SRV_CHK_INTER_THRES. This interval
	 * will be used to spread their start-up date. Those which have
	 * a shorter interval will start independently and will not dictate
	 * too short an interval for all others.
	 */
	for (px = proxies_list; px; px = px->next) {
		for (s = px->srv; s; s = s->next) {
			if (s->slowstart) {
				if ((t = task_new(MAX_THREADS_MASK)) == NULL) {
					ha_alert("Starting [%s:%s] check: out of memory.\n", px->id, s->id);
					return ERR_ALERT | ERR_FATAL;
				}
				/* We need a warmup task that will be called when the server
				 * state switches from down to up.
				 */
				s->warmup = t;
				t->process = server_warmup;
				t->context = s;
				/* server can be in this state only because of */
				if (s->next_state == SRV_ST_STARTING)
					task_schedule(s->warmup, tick_add(now_ms, MS_TO_TICKS(MAX(1000, (now.tv_sec - s->last_change)) / 20)));
			}

			if (s->check.state & CHK_ST_CONFIGURED) {
				nbcheck++;
				if ((srv_getinter(&s->check) >= SRV_CHK_INTER_THRES) &&
				    (!mininter || mininter > srv_getinter(&s->check)))
					mininter = srv_getinter(&s->check);
			}

			if (s->agent.state & CHK_ST_CONFIGURED) {
				nbcheck++;
				if ((srv_getinter(&s->agent) >= SRV_CHK_INTER_THRES) &&
				    (!mininter || mininter > srv_getinter(&s->agent)))
					mininter = srv_getinter(&s->agent);
			}
		}
	}

	if (!nbcheck)
		return 0;

	srand((unsigned)time(NULL));

	/*
	 * 2- start them as far as possible from each others. For this, we will
	 * start them after their interval set to the min interval divided by
	 * the number of servers, weighted by the server's position in the list.
	 */
	for (px = proxies_list; px; px = px->next) {
		if ((px->options2 & PR_O2_CHK_ANY) == PR_O2_EXT_CHK) {
			if (init_pid_list()) {
				ha_alert("Starting [%s] check: out of memory.\n", px->id);
				return ERR_ALERT | ERR_FATAL;
			}
		}

		for (s = px->srv; s; s = s->next) {
			/* A task for the main check */
			if (s->check.state & CHK_ST_CONFIGURED) {
				if (s->check.type == PR_O2_EXT_CHK) {
					if (!prepare_external_check(&s->check))
						return ERR_ALERT | ERR_FATAL;
				}
				if (!start_check_task(&s->check, mininter, nbcheck, srvpos))
					return ERR_ALERT | ERR_FATAL;
				srvpos++;
			}

			/* A task for a auxiliary agent check */
			if (s->agent.state & CHK_ST_CONFIGURED) {
				if (!start_check_task(&s->agent, mininter, nbcheck, srvpos)) {
					return ERR_ALERT | ERR_FATAL;
				}
				srvpos++;
			}
		}
	}
	return 0;
}


/*
 * Return value:
 *   the port to be used for the health check
 *   0 in case no port could be found for the check
 */
static int srv_check_healthcheck_port(struct check *chk)
{
	int i = 0;
	struct server *srv = NULL;

	srv = chk->server;

	/* by default, we use the health check port ocnfigured */
	if (chk->port > 0)
		return chk->port;

	/* try to get the port from check_core.addr if check.port not set */
	i = get_host_port(&chk->addr);
	if (i > 0)
		return i;

	/* try to get the port from server address */
	/* prevent MAPPORTS from working at this point, since checks could
	 * not be performed in such case (MAPPORTS impose a relative ports
	 * based on live traffic)
	 */
	if (srv->flags & SRV_F_MAPPORTS)
		return 0;

	i = srv->svc_port; /* by default */
	if (i > 0)
		return i;

	return 0;
}

/* Initializes an health-check attached to the server <srv>. Non-zero is returned
 * if an error occurred.
 */
static int init_srv_check(struct server *srv)
{
	const char *err;
	struct tcpcheck_rule *r;
	int ret = 0;

	if (!srv->do_check)
		goto out;


	/* If neither a port nor an addr was specified and no check transport
	 * layer is forced, then the transport layer used by the checks is the
	 * same as for the production traffic. Otherwise we use raw_sock by
	 * default, unless one is specified.
	 */
	if (!srv->check.port && !is_addr(&srv->check.addr)) {
		if (!srv->check.use_ssl && srv->use_ssl != -1) {
			srv->check.use_ssl = srv->use_ssl;
			srv->check.xprt    = srv->xprt;
		}
		else if (srv->check.use_ssl == 1)
			srv->check.xprt = xprt_get(XPRT_SSL);
		srv->check.send_proxy |= (srv->pp_opts);
	}

	/* Inherit the mux protocol from the server if not already defined for
	 * the check
	 */
	if (srv->mux_proto && !srv->check.mux_proto)
		srv->check.mux_proto = srv->mux_proto;

	/* validate <srv> server health-check settings */

	/* We need at least a service port, a check port or the first tcp-check
	 * rule must be a 'connect' one when checking an IPv4/IPv6 server.
	 */
	if ((srv_check_healthcheck_port(&srv->check) != 0) ||
	    (!is_inet_addr(&srv->check.addr) && (is_addr(&srv->check.addr) || !is_inet_addr(&srv->addr))))
		goto init;

	if (!srv->proxy->tcpcheck_rules.list || LIST_ISEMPTY(srv->proxy->tcpcheck_rules.list)) {
		ha_alert("config: %s '%s': server '%s' has neither service port nor check port.\n",
			 proxy_type_str(srv->proxy), srv->proxy->id, srv->id);
		ret |= ERR_ALERT | ERR_ABORT;
		goto out;
	}

	/* search the first action (connect / send / expect) in the list */
	r = get_first_tcpcheck_rule(&srv->proxy->tcpcheck_rules);
	if (!r || (r->action != TCPCHK_ACT_CONNECT) || (!r->connect.port && !get_host_port(&r->connect.addr))) {
		ha_alert("config: %s '%s': server '%s' has neither service port nor check port "
			 "nor tcp_check rule 'connect' with port information.\n",
			 proxy_type_str(srv->proxy), srv->proxy->id, srv->id);
		ret |= ERR_ALERT | ERR_ABORT;
		goto out;
	}

	/* scan the tcp-check ruleset to ensure a port has been configured */
	list_for_each_entry(r, srv->proxy->tcpcheck_rules.list, list) {
		if ((r->action == TCPCHK_ACT_CONNECT) && (!r->connect.port || !get_host_port(&r->connect.addr))) {
			ha_alert("config: %s '%s': server '%s' has neither service port nor check port, "
				 "and a tcp_check rule 'connect' with no port information.\n",
				 proxy_type_str(srv->proxy), srv->proxy->id, srv->id);
			ret |= ERR_ALERT | ERR_ABORT;
			goto out;
		}
	}

  init:
	if (!(srv->proxy->options2 & PR_O2_CHK_ANY)) {
		struct tcpcheck_ruleset *rs = NULL;
		struct tcpcheck_rules *rules = &srv->proxy->tcpcheck_rules;
		//char *errmsg = NULL;

		srv->proxy->options2 &= ~PR_O2_CHK_ANY;
		srv->proxy->options2 |= PR_O2_TCPCHK_CHK;

		rs = find_tcpcheck_ruleset("*tcp-check");
		if (!rs) {
			rs = create_tcpcheck_ruleset("*tcp-check");
			if (rs == NULL) {
				ha_alert("config: %s '%s': out of memory.\n",
					 proxy_type_str(srv->proxy), srv->proxy->id);
				ret |= ERR_ALERT | ERR_FATAL;
				goto out;
			}
		}

		free_tcpcheck_vars(&rules->preset_vars);
		rules->list = &rs->rules;
		rules->flags = 0;
	}

	err = init_check(&srv->check, srv->proxy->options2 & PR_O2_CHK_ANY);
	if (err) {
		ha_alert("config: %s '%s': unable to init check for server '%s' (%s).\n",
			 proxy_type_str(srv->proxy), srv->proxy->id, srv->id, err);
		ret |= ERR_ALERT | ERR_ABORT;
		goto out;
	}
	srv->check.state |= CHK_ST_CONFIGURED | CHK_ST_ENABLED;
	global.maxsock++;

  out:
	return ret;
}

/* Initializes an agent-check attached to the server <srv>. Non-zero is returned
 * if an error occurred.
 */
static int init_srv_agent_check(struct server *srv)
{
	struct tcpcheck_rule *chk;
	const char *err;
	int ret = 0;

	if (!srv->do_agent)
		goto out;

	/* If there is no connect rule preceeding all send / expect rules, an
	 * implicit one is inserted before all others.
	 */
	chk = get_first_tcpcheck_rule(srv->agent.tcpcheck_rules);
	if (!chk || chk->action != TCPCHK_ACT_CONNECT) {
		chk = calloc(1, sizeof(*chk));
		if (!chk) {
			ha_alert("config : %s '%s': unable to add implicit tcp-check connect rule"
				 " to agent-check for server '%s' (out of memory).\n",
				 proxy_type_str(srv->proxy), srv->proxy->id, srv->id);
			ret |= ERR_ALERT | ERR_FATAL;
			goto out;
		}
		chk->action = TCPCHK_ACT_CONNECT;
		chk->connect.options = (TCPCHK_OPT_DEFAULT_CONNECT|TCPCHK_OPT_IMPLICIT);
		LIST_ADD(srv->agent.tcpcheck_rules->list, &chk->list);
	}


	err = init_check(&srv->agent, PR_O2_TCPCHK_CHK);
	if (err) {
		ha_alert("config: %s '%s': unable to init agent-check for server '%s' (%s).\n",
			 proxy_type_str(srv->proxy), srv->proxy->id, srv->id, err);
		ret |= ERR_ALERT | ERR_ABORT;
		goto out;
	}

	if (!srv->agent.inter)
		srv->agent.inter = srv->check.inter;

	srv->agent.state |= CHK_ST_CONFIGURED | CHK_ST_ENABLED | CHK_ST_AGENT;
	global.maxsock++;

  out:
	return ret;
}

/* Check tcp-check health-check configuration for the proxy <px>. */
static int check_proxy_tcpcheck(struct proxy *px)
{
	struct tcpcheck_rule *chk, *back;
	char *comment = NULL, *errmsg = NULL;
	enum tcpcheck_rule_type prev_action = TCPCHK_ACT_COMMENT;
	int ret = 0;

	if (!(px->cap & PR_CAP_BE) || (px->options2 & PR_O2_CHK_ANY) != PR_O2_TCPCHK_CHK) {
		deinit_proxy_tcpcheck(px);
		goto out;
	}

	free(px->check_command);
	free(px->check_path);
	px->check_command = px->check_path = NULL;

	if (!px->tcpcheck_rules.list) {
		ha_alert("config : proxy '%s' : tcp-check configured but no ruleset defined.\n", px->id);
		ret |= ERR_ALERT | ERR_FATAL;
		goto out;
	}

	/* HTTP ruleset only :  */
	if ((px->tcpcheck_rules.flags & TCPCHK_RULES_PROTO_CHK) == TCPCHK_RULES_HTTP_CHK) {
		struct tcpcheck_rule *next;

		/* move remaining implicit send rule from "option httpchk" line to the right place.
		 * If such rule exists, it must be the first one. In this case, the rule is moved
		 * after the first connect rule, if any. Otherwise, nothing is done.
		 */
		chk = get_first_tcpcheck_rule(&px->tcpcheck_rules);
		if (chk && chk->action == TCPCHK_ACT_SEND && (chk->send.http.flags & TCPCHK_SND_HTTP_FROM_OPT)) {
			next = get_next_tcpcheck_rule(&px->tcpcheck_rules, chk);
			if (next && next->action == TCPCHK_ACT_CONNECT) {
				LIST_DEL(&chk->list);
				LIST_ADD(&next->list, &chk->list);
				chk->index = next->index;
			}
		}

		/* add implicit expect rule if the last one is a send. It is inherited from previous
		 * versions where the http expect rule was optional. Now it is possible to chained
		 * send/expect rules but the last expect may still be implicit.
		 */
		chk = get_last_tcpcheck_rule(&px->tcpcheck_rules);
		if (chk && chk->action == TCPCHK_ACT_SEND) {
			next = parse_tcpcheck_expect((char *[]){"http-check", "expect", "rstatus", "^[23]", ""},
						     1, px, px->tcpcheck_rules.list, TCPCHK_RULES_HTTP_CHK,
						     px->conf.file, px->conf.line, &errmsg);
			if (!next) {
				ha_alert("config : proxy '%s': unable to add implicit http-check expect rule "
					 "(%s).\n", px->id, errmsg);
				free(errmsg);
				ret |= ERR_ALERT | ERR_FATAL;
				goto out;
			}
			LIST_ADDQ(px->tcpcheck_rules.list, &next->list);
			next->index = chk->index;
		}
	}

	/* For all ruleset: */

	/* If there is no connect rule preceeding all send / expect rules, an
	 * implicit one is inserted before all others.
	 */
	chk = get_first_tcpcheck_rule(&px->tcpcheck_rules);
	if (!chk || chk->action != TCPCHK_ACT_CONNECT) {
		chk = calloc(1, sizeof(*chk));
		if (!chk) {
			ha_alert("config : proxy '%s': unable to add implicit tcp-check connect rule "
				 "(out of memory).\n", px->id);
			ret |= ERR_ALERT | ERR_FATAL;
			goto out;
		}
		chk->action = TCPCHK_ACT_CONNECT;
		chk->connect.options = (TCPCHK_OPT_DEFAULT_CONNECT|TCPCHK_OPT_IMPLICIT);
		LIST_ADD(px->tcpcheck_rules.list, &chk->list);
	}

	/* Remove all comment rules. To do so, when a such rule is found, the
	 * comment is assigned to the following rule(s).
	 */
	list_for_each_entry_safe(chk, back, px->tcpcheck_rules.list, list) {
		if (chk->action != prev_action && prev_action != TCPCHK_ACT_COMMENT) {
			free(comment);
			comment = NULL;
		}

		prev_action = chk->action;
		switch (chk->action) {
		case TCPCHK_ACT_COMMENT:
			free(comment);
			comment = chk->comment;
			LIST_DEL(&chk->list);
			free(chk);
			break;
		case TCPCHK_ACT_CONNECT:
			if (!chk->comment && comment)
				chk->comment = strdup(comment);
			/* fall though */
		case TCPCHK_ACT_ACTION_KW:
			free(comment);
			comment = NULL;
			break;
		case TCPCHK_ACT_SEND:
		case TCPCHK_ACT_EXPECT:
			if (!chk->comment && comment)
				chk->comment = strdup(comment);
			break;
		}
	}
	free(comment);
	comment = NULL;

  out:
	return ret;
}

void deinit_proxy_tcpcheck(struct proxy *px)
{
	free_tcpcheck_vars(&px->tcpcheck_rules.preset_vars);
	px->tcpcheck_rules.flags = 0;
	px->tcpcheck_rules.list  = NULL;
}

static void deinit_srv_check(struct server *srv)
{
	if (srv->check.state & CHK_ST_CONFIGURED)
		free_check(&srv->check);
	srv->check.state &= ~CHK_ST_CONFIGURED & ~CHK_ST_ENABLED;
	srv->do_check = 0;
}


static void deinit_srv_agent_check(struct server *srv)
{
	if (srv->agent.tcpcheck_rules) {
		free_tcpcheck_vars(&srv->agent.tcpcheck_rules->preset_vars);
		free(srv->agent.tcpcheck_rules);
		srv->agent.tcpcheck_rules = NULL;
	}

	if (srv->agent.state & CHK_ST_CONFIGURED)
		free_check(&srv->agent);

	srv->agent.state &= ~CHK_ST_CONFIGURED & ~CHK_ST_ENABLED & ~CHK_ST_AGENT;
	srv->do_agent = 0;
}

static void deinit_tcpchecks()
{
	struct tcpcheck_ruleset *rs;
	struct tcpcheck_rule *r, *rb;
	struct ebpt_node *node, *next;

	node = ebpt_first(&shared_tcpchecks);
	while (node) {
		next = ebpt_next(node);
		ebpt_delete(node);
		free(node->key);
		rs = container_of(node, typeof(*rs), node);
		list_for_each_entry_safe(r, rb, &rs->rules, list) {
			LIST_DEL(&r->list);
			free_tcpcheck(r, 0);
		}
		free(rs);
		node = next;
	}
}


REGISTER_POST_SERVER_CHECK(init_srv_check);
REGISTER_POST_SERVER_CHECK(init_srv_agent_check);
REGISTER_POST_PROXY_CHECK(check_proxy_tcpcheck);
REGISTER_POST_CHECK(start_checks);

REGISTER_SERVER_DEINIT(deinit_srv_check);
REGISTER_SERVER_DEINIT(deinit_srv_agent_check);
REGISTER_PROXY_DEINIT(deinit_proxy_tcpcheck);
REGISTER_POST_DEINIT(deinit_tcpchecks);

/**************************************************************************/
/****************************** Email alerts ******************************/
/* NOTE: It may be pertinent to use an applet to handle email alerts      */
/*        instead of a tcp-check ruleset                                  */
/**************************************************************************/
void email_alert_free(struct email_alert *alert)
{
	struct tcpcheck_rule *rule, *back;

	if (!alert)
		return;

	if (alert->rules.list) {
		list_for_each_entry_safe(rule, back, alert->rules.list, list) {
			LIST_DEL(&rule->list);
			free_tcpcheck(rule, 1);
		}
		free_tcpcheck_vars(&alert->rules.preset_vars);
		free(alert->rules.list);
		alert->rules.list = NULL;
	}
	pool_free(pool_head_email_alert, alert);
}

static struct task *process_email_alert(struct task *t, void *context, unsigned short state)
{
	struct check        *check = context;
	struct email_alertq *q;
	struct email_alert  *alert;

	q = container_of(check, typeof(*q), check);

	HA_SPIN_LOCK(EMAIL_ALERTS_LOCK, &q->lock);
	while (1) {
		if (!(check->state & CHK_ST_ENABLED)) {
			if (LIST_ISEMPTY(&q->email_alerts)) {
				/* All alerts processed, queue the task */
				t->expire = TICK_ETERNITY;
				task_queue(t);
				goto end;
			}

			alert = LIST_NEXT(&q->email_alerts, typeof(alert), list);
			LIST_DEL(&alert->list);
			t->expire             = now_ms;
			check->tcpcheck_rules = &alert->rules;
			check->status         = HCHK_STATUS_INI;
			check->state         |= CHK_ST_ENABLED;
		}

		process_chk(t, context, state);
		if (check->state & CHK_ST_INPROGRESS)
			break;

		alert = container_of(check->tcpcheck_rules, typeof(*alert), rules);
		email_alert_free(alert);
		check->tcpcheck_rules = NULL;
		check->server         = NULL;
		check->state         &= ~CHK_ST_ENABLED;
	}
  end:
	HA_SPIN_UNLOCK(EMAIL_ALERTS_LOCK, &q->lock);
	return t;
}

/* Initializes mailer alerts for the proxy <p> using <mls> parameters.
 *
 * The function returns 1 in success case, otherwise, it returns 0 and err is
 * filled.
 */
int init_email_alert(struct mailers *mls, struct proxy *p, char **err)
{
	struct mailer       *mailer;
	struct email_alertq *queues;
	const char          *err_str;
	int                  i = 0;

	if ((queues = calloc(mls->count, sizeof(*queues))) == NULL) {
		memprintf(err, "out of memory while allocating mailer alerts queues");
		goto fail_no_queue;
	}

	for (mailer = mls->mailer_list; mailer; i++, mailer = mailer->next) {
		struct email_alertq *q     = &queues[i];
		struct check        *check = &q->check;
		struct task         *t;

		LIST_INIT(&q->email_alerts);
		HA_SPIN_INIT(&q->lock);
		check->inter = mls->timeout.mail;
		check->rise = DEF_AGENT_RISETIME;
		check->proxy = p;
		check->fall = DEF_AGENT_FALLTIME;
		if ((err_str = init_check(check, PR_O2_TCPCHK_CHK))) {
			memprintf(err, "%s", err_str);
			goto error;
		}

		check->xprt = mailer->xprt;
		check->addr = mailer->addr;
		check->port = get_host_port(&mailer->addr);

		if ((t = task_new(MAX_THREADS_MASK)) == NULL) {
			memprintf(err, "out of memory while allocating mailer alerts task");
			goto error;
		}

		check->task = t;
		t->process = process_email_alert;
		t->context = check;

		/* check this in one ms */
		t->expire    = TICK_ETERNITY;
		check->start = now;
		task_queue(t);
	}

	mls->users++;
	free(p->email_alert.mailers.name);
	p->email_alert.mailers.m = mls;
	p->email_alert.queues    = queues;
	return 0;

  error:
	for (i = 0; i < mls->count; i++) {
		struct email_alertq *q     = &queues[i];
		struct check        *check = &q->check;

		free_check(check);
	}
	free(queues);
  fail_no_queue:
	return 1;
}

static int add_tcpcheck_expect_str(struct tcpcheck_rules *rules, const char *str)
{
	struct tcpcheck_rule *tcpcheck, *prev_check;
	struct tcpcheck_expect *expect;

	if ((tcpcheck = pool_alloc(pool_head_tcpcheck_rule)) == NULL)
		return 0;
	memset(tcpcheck, 0, sizeof(*tcpcheck));
	tcpcheck->action = TCPCHK_ACT_EXPECT;

	expect = &tcpcheck->expect;
	expect->type = TCPCHK_EXPECT_STRING;
	LIST_INIT(&expect->onerror_fmt);
	LIST_INIT(&expect->onsuccess_fmt);
	expect->ok_status = HCHK_STATUS_L7OKD;
	expect->err_status = HCHK_STATUS_L7RSP;
	expect->tout_status = HCHK_STATUS_L7TOUT;
	expect->data = ist2(strdup(str), strlen(str));
	if (!isttest(expect->data)) {
		pool_free(pool_head_tcpcheck_rule, tcpcheck);
		return 0;
	}

	/* All tcp-check expect points back to the first inverse expect rule
	 * in a chain of one or more expect rule, potentially itself.
	 */
	tcpcheck->expect.head = tcpcheck;
	list_for_each_entry_rev(prev_check, rules->list, list) {
		if (prev_check->action == TCPCHK_ACT_EXPECT) {
			if (prev_check->expect.flags & TCPCHK_EXPT_FL_INV)
				tcpcheck->expect.head = prev_check;
			continue;
		}
		if (prev_check->action != TCPCHK_ACT_COMMENT && prev_check->action != TCPCHK_ACT_ACTION_KW)
			break;
	}
	LIST_ADDQ(rules->list, &tcpcheck->list);
	return 1;
}

static int add_tcpcheck_send_strs(struct tcpcheck_rules *rules, const char * const *strs)
{
	struct tcpcheck_rule *tcpcheck;
	struct tcpcheck_send *send;
	const char *in;
	char *dst;
	int i;

	if ((tcpcheck = pool_alloc(pool_head_tcpcheck_rule)) == NULL)
		return 0;
	memset(tcpcheck, 0, sizeof(*tcpcheck));
	tcpcheck->action       = TCPCHK_ACT_SEND;

	send = &tcpcheck->send;
	send->type = TCPCHK_SEND_STRING;

	for (i = 0; strs[i]; i++)
		send->data.len += strlen(strs[i]);

	send->data.ptr = malloc(istlen(send->data) + 1);
	if (!isttest(send->data)) {
		pool_free(pool_head_tcpcheck_rule, tcpcheck);
		return 0;
	}

	dst = istptr(send->data);
	for (i = 0; strs[i]; i++)
		for (in = strs[i]; (*dst = *in++); dst++);
	*dst = 0;

	LIST_ADDQ(rules->list, &tcpcheck->list);
	return 1;
}

static int enqueue_one_email_alert(struct proxy *p, struct server *s,
				   struct email_alertq *q, const char *msg)
{
	struct email_alert   *alert;
	struct tcpcheck_rule *tcpcheck;
	struct check *check = &q->check;

	if ((alert = pool_alloc(pool_head_email_alert)) == NULL)
		goto error;
	LIST_INIT(&alert->list);
	alert->rules.flags = TCPCHK_RULES_TCP_CHK;
	alert->rules.list = calloc(1, sizeof(*alert->rules.list));
	if (!alert->rules.list)
		goto error;
	LIST_INIT(alert->rules.list);
	LIST_INIT(&alert->rules.preset_vars); /* unused for email alerts */
	alert->srv = s;

	if ((tcpcheck = pool_alloc(pool_head_tcpcheck_rule)) == NULL)
		goto error;
	memset(tcpcheck, 0, sizeof(*tcpcheck));
	tcpcheck->action       = TCPCHK_ACT_CONNECT;
	tcpcheck->comment      = NULL;

	LIST_ADDQ(alert->rules.list, &tcpcheck->list);

	if (!add_tcpcheck_expect_str(&alert->rules, "220 "))
		goto error;

	{
		const char * const strs[4] = { "EHLO ", p->email_alert.myhostname, "\r\n" };
		if (!add_tcpcheck_send_strs(&alert->rules, strs))
			goto error;
	}

	if (!add_tcpcheck_expect_str(&alert->rules, "250 "))
		goto error;

	{
		const char * const strs[4] = { "MAIL FROM:<", p->email_alert.from, ">\r\n" };
		if (!add_tcpcheck_send_strs(&alert->rules, strs))
			goto error;
	}

	if (!add_tcpcheck_expect_str(&alert->rules, "250 "))
		goto error;

	{
		const char * const strs[4] = { "RCPT TO:<", p->email_alert.to, ">\r\n" };
		if (!add_tcpcheck_send_strs(&alert->rules, strs))
			goto error;
	}

	if (!add_tcpcheck_expect_str(&alert->rules, "250 "))
		goto error;

	{
		const char * const strs[2] = { "DATA\r\n" };
		if (!add_tcpcheck_send_strs(&alert->rules, strs))
			goto error;
	}

	if (!add_tcpcheck_expect_str(&alert->rules, "354 "))
		goto error;

	{
		struct tm tm;
		char datestr[48];
		const char * const strs[18] = {
			"From: ", p->email_alert.from, "\r\n",
			"To: ", p->email_alert.to, "\r\n",
			"Date: ", datestr, "\r\n",
			"Subject: [HAproxy Alert] ", msg, "\r\n",
			"\r\n",
			msg, "\r\n",
			"\r\n",
			".\r\n",
			NULL
		};

		get_localtime(date.tv_sec, &tm);

		if (strftime(datestr, sizeof(datestr), "%a, %d %b %Y %T %z (%Z)", &tm) == 0) {
			goto error;
		}

		if (!add_tcpcheck_send_strs(&alert->rules, strs))
			goto error;
	}

	if (!add_tcpcheck_expect_str(&alert->rules, "250 "))
		goto error;

	{
		const char * const strs[2] = { "QUIT\r\n" };
		if (!add_tcpcheck_send_strs(&alert->rules, strs))
			goto error;
	}

	if (!add_tcpcheck_expect_str(&alert->rules, "221 "))
		goto error;

	HA_SPIN_LOCK(EMAIL_ALERTS_LOCK, &q->lock);
	task_wakeup(check->task, TASK_WOKEN_MSG);
	LIST_ADDQ(&q->email_alerts, &alert->list);
	HA_SPIN_UNLOCK(EMAIL_ALERTS_LOCK, &q->lock);
	return 1;

error:
	email_alert_free(alert);
	return 0;
}

static void enqueue_email_alert(struct proxy *p, struct server *s, const char *msg)
{
	int i;
	struct mailer *mailer;

	for (i = 0, mailer = p->email_alert.mailers.m->mailer_list;
	     i < p->email_alert.mailers.m->count; i++, mailer = mailer->next) {
		if (!enqueue_one_email_alert(p, s, &p->email_alert.queues[i], msg)) {
			ha_alert("Email alert [%s] could not be enqueued: out of memory\n", p->id);
			return;
		}
	}

	return;
}

/*
 * Send email alert if configured.
 */
void send_email_alert(struct server *s, int level, const char *format, ...)
{
	va_list argp;
	char buf[1024];
	int len;
	struct proxy *p = s->proxy;

	if (!p->email_alert.mailers.m || level > p->email_alert.level || format == NULL)
		return;

	va_start(argp, format);
	len = vsnprintf(buf, sizeof(buf), format, argp);
	va_end(argp);

	if (len < 0 || len >= sizeof(buf)) {
		ha_alert("Email alert [%s] could not format message\n", p->id);
		return;
	}

	enqueue_email_alert(p, s, buf);
}

/**************************************************************************/
/************************** Check sample fetches **************************/
/**************************************************************************/
/* extracts check payload at a fixed position and length */
static int
smp_fetch_chk_payload(const struct arg *arg_p, struct sample *smp, const char *kw, void *private)
{
	unsigned int buf_offset = ((arg_p[0].type == ARGT_SINT) ? arg_p[0].data.sint : 0);
	unsigned int buf_size = ((arg_p[1].type == ARGT_SINT) ? arg_p[1].data.sint : 0);
	struct check *check = (smp->sess ? objt_check(smp->sess->origin) : NULL);
	struct buffer *buf;

	if (!check)
		return 0;

	buf = &check->bi;
	if (buf_offset > b_data(buf))
		goto no_match;
	if (buf_offset + buf_size > b_data(buf))
		buf_size = 0;

	/* init chunk as read only */
	smp->data.type = SMP_T_STR;
	smp->flags = SMP_F_VOLATILE | SMP_F_CONST;
	chunk_initlen(&smp->data.u.str, b_head(buf) + buf_offset, 0, (buf_size ? buf_size : (b_data(buf) - buf_offset)));

	return 1;

 no_match:
	smp->flags = 0;
	return 0;
}

static struct sample_fetch_kw_list smp_kws = {ILH, {
	{ "check.payload", smp_fetch_chk_payload,   ARG2(0,SINT,SINT), NULL, SMP_T_STR,  SMP_USE_INTRN },
	{ /* END */ },
}};

INITCALL1(STG_REGISTER, sample_register_fetches, &smp_kws);


/**************************************************************************/
/************************ Check's parsing functions ***********************/
/**************************************************************************/
/* Parses the "tcp-check" proxy keyword */
static int proxy_parse_tcpcheck(char **args, int section, struct proxy *curpx,
				struct proxy *defpx, const char *file, int line,
				char **errmsg)
{
	struct tcpcheck_ruleset *rs = NULL;
	struct tcpcheck_rule *chk = NULL;
	int index, cur_arg, ret = 0;

	if (warnifnotcap(curpx, PR_CAP_BE, file, line, args[0], NULL))
		ret = 1;

	/* Deduce the ruleset name from the proxy info */
	chunk_printf(&trash, "*tcp-check-%s_%s-%d",
		     ((curpx == defpx) ? "defaults" : curpx->id),
		     curpx->conf.file, curpx->conf.line);

	rs = find_tcpcheck_ruleset(b_orig(&trash));
	if (rs == NULL) {
		rs = create_tcpcheck_ruleset(b_orig(&trash));
		if (rs == NULL) {
			memprintf(errmsg, "out of memory.\n");
			goto error;
		}
	}

	index = 0;
	if (!LIST_ISEMPTY(&rs->rules)) {
		chk = LIST_PREV(&rs->rules, typeof(chk), list);
		index = chk->index + 1;
	}

	cur_arg = 1;
	if (strcmp(args[cur_arg], "connect") == 0)
		chk = parse_tcpcheck_connect(args, cur_arg, curpx, &rs->rules, file, line, errmsg);
	else if (strcmp(args[cur_arg], "send") == 0 || strcmp(args[cur_arg], "send-binary") == 0)
		chk = parse_tcpcheck_send(args, cur_arg, curpx, &rs->rules, file, line, errmsg);
	else if (strcmp(args[cur_arg], "expect") == 0)
		chk = parse_tcpcheck_expect(args, cur_arg, curpx, &rs->rules, 0, file, line, errmsg);
	else if (strcmp(args[cur_arg], "comment") == 0)
		chk = parse_tcpcheck_comment(args, cur_arg, curpx, &rs->rules, file, line, errmsg);
	else {
		struct action_kw *kw = action_kw_tcp_check_lookup(args[cur_arg]);

		if (!kw) {
			action_kw_tcp_check_build_list(&trash);
			memprintf(errmsg, "'%s' only supports 'comment', 'connect', 'send', 'send-binary', 'expect'"
				  "%s%s. but got '%s'",
				  args[0], (*trash.area ? ", " : ""), trash.area, args[1]);
			goto error;
		}
		chk = parse_tcpcheck_action(args, cur_arg, curpx, &rs->rules, kw, file, line, errmsg);
	}

	if (!chk) {
		memprintf(errmsg, "'%s %s' : %s.", args[0], args[1], *errmsg);
		goto error;
	}
	ret = (*errmsg != NULL); /* Handle warning */

	/* No error: add the tcp-check rule in the list */
	chk->index = index;
	LIST_ADDQ(&rs->rules, &chk->list);

	if ((curpx->options2 & PR_O2_CHK_ANY) == PR_O2_TCPCHK_CHK &&
	    (curpx->tcpcheck_rules.flags & TCPCHK_RULES_PROTO_CHK) == TCPCHK_RULES_TCP_CHK) {
		/* Use this ruleset if the proxy already has tcp-check enabled */
		curpx->tcpcheck_rules.list = &rs->rules;
		curpx->tcpcheck_rules.flags &= ~TCPCHK_RULES_UNUSED_TCP_RS;
	}
	else {
		/* mark this ruleset as unused for now */
		curpx->tcpcheck_rules.flags |= TCPCHK_RULES_UNUSED_TCP_RS;
	}

	return ret;

  error:
	free_tcpcheck(chk, 0);
	free_tcpcheck_ruleset(rs);
	return -1;
}

/* Parses the "http-check" proxy keyword */
static int proxy_parse_httpcheck(char **args, int section, struct proxy *curpx,
				 struct proxy *defpx, const char *file, int line,
				 char **errmsg)
{
	struct tcpcheck_ruleset *rs = NULL;
	struct tcpcheck_rule *chk = NULL;
	int index, cur_arg, ret = 0;

	if (warnifnotcap(curpx, PR_CAP_BE, file, line, args[0], NULL))
		ret = 1;

	cur_arg = 1;
	if (strcmp(args[cur_arg], "disable-on-404") == 0) {
		/* enable a graceful server shutdown on an HTTP 404 response */
		curpx->options |= PR_O_DISABLE404;
		if (too_many_args(1, args, errmsg, NULL))
			goto error;
		goto out;
	}
	else if (strcmp(args[cur_arg], "send-state") == 0) {
		/* enable emission of the apparent state of a server in HTTP checks */
		curpx->options2 |= PR_O2_CHK_SNDST;
		if (too_many_args(1, args, errmsg, NULL))
			goto error;
		goto out;
	}

	/* Deduce the ruleset name from the proxy info */
	chunk_printf(&trash, "*http-check-%s_%s-%d",
		     ((curpx == defpx) ? "defaults" : curpx->id),
		     curpx->conf.file, curpx->conf.line);

	rs = find_tcpcheck_ruleset(b_orig(&trash));
	if (rs == NULL) {
		rs = create_tcpcheck_ruleset(b_orig(&trash));
		if (rs == NULL) {
			memprintf(errmsg, "out of memory.\n");
			goto error;
		}
	}

	index = 0;
	if (!LIST_ISEMPTY(&rs->rules)) {
		chk = LIST_PREV(&rs->rules, typeof(chk), list);
		if (chk->action != TCPCHK_ACT_SEND || !(chk->send.http.flags & TCPCHK_SND_HTTP_FROM_OPT))
			index = chk->index + 1;
	}

	if (strcmp(args[cur_arg], "connect") == 0)
		chk = parse_tcpcheck_connect(args, cur_arg, curpx, &rs->rules, file, line, errmsg);
	else if (strcmp(args[cur_arg], "send") == 0)
		chk = parse_tcpcheck_send_http(args, cur_arg, curpx, &rs->rules, file, line, errmsg);
	else if (strcmp(args[cur_arg], "expect") == 0)
		chk = parse_tcpcheck_expect(args, cur_arg, curpx, &rs->rules, TCPCHK_RULES_HTTP_CHK,
					    file, line, errmsg);
	else if (strcmp(args[cur_arg], "comment") == 0)
		chk = parse_tcpcheck_comment(args, cur_arg, curpx, &rs->rules, file, line, errmsg);
	else {
		struct action_kw *kw = action_kw_tcp_check_lookup(args[cur_arg]);

		if (!kw) {
			action_kw_tcp_check_build_list(&trash);
			memprintf(errmsg, "'%s' only supports 'disable-on-404', 'send-state', 'comment', 'connect',"
				  " 'send', 'expect'%s%s. but got '%s'",
				  args[0], (*trash.area ? ", " : ""), trash.area, args[1]);
			goto error;
		}
		chk = parse_tcpcheck_action(args, cur_arg, curpx, &rs->rules, kw, file, line, errmsg);
	}

	if (!chk) {
		memprintf(errmsg, "'%s %s' : %s.", args[0], args[1], *errmsg);
		goto error;
	}
	ret = (*errmsg != NULL); /* Handle warning */

	chk->index = index;
	if ((curpx->options2 & PR_O2_CHK_ANY) == PR_O2_TCPCHK_CHK &&
	    (curpx->tcpcheck_rules.flags & TCPCHK_RULES_PROTO_CHK) == TCPCHK_RULES_HTTP_CHK) {
		/* Use this ruleset if the proxy already has http-check enabled */
		curpx->tcpcheck_rules.list = &rs->rules;
		curpx->tcpcheck_rules.flags &= ~TCPCHK_RULES_UNUSED_HTTP_RS;
		if (!tcpcheck_add_http_rule(chk, &curpx->tcpcheck_rules, errmsg)) {
			memprintf(errmsg, "'%s %s' : %s.", args[0], args[1], *errmsg);
			curpx->tcpcheck_rules.list = NULL;
			goto error;
		}
	}
	else {
		/* mark this ruleset as unused for now */
		curpx->tcpcheck_rules.flags |= TCPCHK_RULES_UNUSED_HTTP_RS;
		LIST_ADDQ(&rs->rules, &chk->list);
	}

  out:
	return ret;

  error:
	free_tcpcheck(chk, 0);
	free_tcpcheck_ruleset(rs);
	return -1;
}

/* Parses the "external-check" proxy keyword */
static int proxy_parse_extcheck(char **args, int section, struct proxy *curpx,
				struct proxy *defpx, const char *file, int line,
				char **errmsg)
{
	int cur_arg, ret = 0;

	cur_arg = 1;
	if (!*(args[cur_arg])) {
		memprintf(errmsg, "missing argument after '%s'.\n", args[0]);
		goto error;
	}

	if (strcmp(args[cur_arg], "command") == 0) {
		if (too_many_args(2, args, errmsg, NULL))
			goto error;
		if (!*(args[cur_arg+1])) {
			memprintf(errmsg, "missing argument after '%s'.", args[cur_arg]);
			goto error;
		}
		free(curpx->check_command);
		curpx->check_command = strdup(args[cur_arg+1]);
	}
	else if (strcmp(args[cur_arg], "path") == 0) {
		if (too_many_args(2, args, errmsg, NULL))
			goto error;
		if (!*(args[cur_arg+1])) {
			memprintf(errmsg, "missing argument after '%s'.", args[cur_arg]);
			goto error;
		}
		free(curpx->check_path);
		curpx->check_path = strdup(args[cur_arg+1]);
	}
	else {
		memprintf(errmsg, "'%s' only supports 'command' and 'path'. but got '%s'.",
			  args[0], args[1]);
		goto error;
	}

	ret = (*errmsg != NULL); /* Handle warning */
	return ret;

error:
	return -1;
}

/* Parses the "option tcp-check" proxy keyword */
int proxy_parse_tcp_check_opt(char **args, int cur_arg, struct proxy *curpx, struct proxy *defpx,
			      const char *file, int line)
{
	struct tcpcheck_ruleset *rs = NULL;
	struct tcpcheck_rules *rules = &curpx->tcpcheck_rules;
	int err_code = 0;

	if (warnifnotcap(curpx, PR_CAP_BE, file, line, args[cur_arg+1], NULL))
		err_code |= ERR_WARN;

	if (alertif_too_many_args_idx(0, 1, file, line, args, &err_code))
		goto out;

	curpx->options2 &= ~PR_O2_CHK_ANY;
	curpx->options2 |= PR_O2_TCPCHK_CHK;

	if ((rules->flags & TCPCHK_RULES_PROTO_CHK) == TCPCHK_RULES_TCP_CHK) {
		/* If a tcp-check rulesset is already set, do nothing */
		if (rules->list)
			goto out;

		/* If a tcp-check ruleset is waiting to be used for the current proxy,
		 * get it.
		 */
		if (rules->flags & TCPCHK_RULES_UNUSED_TCP_RS)
			goto curpx_ruleset;

		/* Otherwise, try to get the tcp-check ruleset of the default proxy */
		chunk_printf(&trash, "*tcp-check-defaults_%s-%d", defpx->conf.file, defpx->conf.line);
		rs = find_tcpcheck_ruleset(b_orig(&trash));
		if (rs)
			goto ruleset_found;
	}

  curpx_ruleset:
	/* Deduce the ruleset name from the proxy info */
	chunk_printf(&trash, "*tcp-check-%s_%s-%d",
		     ((curpx == defpx) ? "defaults" : curpx->id),
		     curpx->conf.file, curpx->conf.line);

	rs = find_tcpcheck_ruleset(b_orig(&trash));
	if (rs == NULL) {
		rs = create_tcpcheck_ruleset(b_orig(&trash));
		if (rs == NULL) {
			ha_alert("parsing [%s:%d] : out of memory.\n", file, line);
			goto error;
		}
	}

  ruleset_found:
	free_tcpcheck_vars(&rules->preset_vars);
	rules->list = &rs->rules;
	rules->flags |= TCPCHK_RULES_TCP_CHK;

  out:
	return err_code;

  error:
	err_code |= ERR_ALERT | ERR_FATAL;
	goto out;
}

/* Parses the "option redis-check" proxy keyword */
int proxy_parse_redis_check_opt(char **args, int cur_arg, struct proxy *curpx, struct proxy *defpx,
				const char *file, int line)
{
	static char *redis_req = "*1\r\n$4\r\nPING\r\n";
	static char *redis_res = "+PONG\r\n";

	struct tcpcheck_ruleset *rs = NULL;
	struct tcpcheck_rules *rules = &curpx->tcpcheck_rules;
	struct tcpcheck_rule *chk;
	char *errmsg = NULL;
	int err_code = 0;

	if (warnifnotcap(curpx, PR_CAP_BE, file, line, args[cur_arg+1], NULL))
		err_code |= ERR_WARN;

	if (alertif_too_many_args_idx(0, 1, file, line, args, &err_code))
		goto out;

	curpx->options2 &= ~PR_O2_CHK_ANY;
	curpx->options2 |= PR_O2_TCPCHK_CHK;

	free_tcpcheck_vars(&rules->preset_vars);
	rules->list  = NULL;
	rules->flags = 0;

	rs = find_tcpcheck_ruleset("*redis-check");
	if (rs)
		goto ruleset_found;

	rs = create_tcpcheck_ruleset("*redis-check");
	if (rs == NULL) {
		ha_alert("parsing [%s:%d] : out of memory.\n", file, line);
		goto error;
	}

	chk = parse_tcpcheck_send((char *[]){"tcp-check", "send", redis_req, ""},
				  1, curpx, &rs->rules, file, line, &errmsg);
	if (!chk) {
		ha_alert("parsing [%s:%d] : %s\n", file, line, errmsg);
		goto error;
	}
	chk->index = 0;
	LIST_ADDQ(&rs->rules, &chk->list);

	chk = parse_tcpcheck_expect((char *[]){"tcp-check", "expect", "string", redis_res,
				               "error-status", "L7STS",
				               "on-error", "%[check.payload(),cut_crlf]",
				               "on-success", "Redis server is ok",
				               ""},
				    1, curpx, &rs->rules, TCPCHK_RULES_REDIS_CHK, file, line, &errmsg);
	if (!chk) {
		ha_alert("parsing [%s:%d] : %s\n", file, line, errmsg);
		goto error;
	}
	chk->index = 1;
	LIST_ADDQ(&rs->rules, &chk->list);

	ebis_insert(&shared_tcpchecks, &rs->node);

  ruleset_found:
	rules->list = &rs->rules;
	rules->flags |= TCPCHK_RULES_REDIS_CHK;

  out:
	free(errmsg);
	return err_code;

  error:
	free_tcpcheck_ruleset(rs);
	err_code |= ERR_ALERT | ERR_FATAL;
	goto out;
}


/* Parses the "option ssl-hello-chk" proxy keyword */
int proxy_parse_ssl_hello_chk_opt(char **args, int cur_arg, struct proxy *curpx, struct proxy *defpx,
				  const char *file, int line)
{
	/* This is the SSLv3 CLIENT HELLO packet used in conjunction with the
	 * ssl-hello-chk option to ensure that the remote server speaks SSL.
	 *
	 * Check RFC 2246 (TLSv1.0) sections A.3 and A.4 for details.
	 */
	static char sslv3_client_hello[] = {
		"16"                        /* ContentType         : 0x16 = Hanshake           */
		"0300"                      /* ProtocolVersion     : 0x0300 = SSLv3            */
		"0079"                      /* ContentLength       : 0x79 bytes after this one */
		"01"                        /* HanshakeType        : 0x01 = CLIENT HELLO       */
		"000075"                    /* HandshakeLength     : 0x75 bytes after this one */
		"0300"                      /* Hello Version       : 0x0300 = v3               */
		"%[date(),htonl,hex]"       /* Unix GMT Time (s)   : filled with <now> (@0x0B) */
		"%[str(HAPROXYSSLCHK\nHAPROXYSSLCHK\n),hex]" /* Random   : must be exactly 28 bytes  */
		"00"                        /* Session ID length   : empty (no session ID)     */
		"004E"                      /* Cipher Suite Length : 78 bytes after this one   */
		"0001" "0002" "0003" "0004" /* 39 most common ciphers :  */
		"0005" "0006" "0007" "0008" /* 0x01...0x1B, 0x2F...0x3A  */
		"0009" "000A" "000B" "000C" /* This covers RSA/DH,       */
		"000D" "000E" "000F" "0010" /* various bit lengths,      */
		"0011" "0012" "0013" "0014" /* SHA1/MD5, DES/3DES/AES... */
		"0015" "0016" "0017" "0018"
		"0019" "001A" "001B" "002F"
		"0030" "0031" "0032" "0033"
		"0034" "0035" "0036" "0037"
		"0038" "0039" "003A"
		"01"                       /* Compression Length  : 0x01 = 1 byte for types   */
		"00"                       /* Compression Type    : 0x00 = NULL compression   */
	};

	struct tcpcheck_ruleset *rs = NULL;
	struct tcpcheck_rules *rules = &curpx->tcpcheck_rules;
	struct tcpcheck_rule *chk;
	char *errmsg = NULL;
	int err_code = 0;

	if (warnifnotcap(curpx, PR_CAP_BE, file, line, args[cur_arg+1], NULL))
		err_code |= ERR_WARN;

	if (alertif_too_many_args_idx(0, 1, file, line, args, &err_code))
		goto out;

	curpx->options2 &= ~PR_O2_CHK_ANY;
	curpx->options2 |= PR_O2_TCPCHK_CHK;

	free_tcpcheck_vars(&rules->preset_vars);
	rules->list  = NULL;
	rules->flags = 0;

	rs = find_tcpcheck_ruleset("*ssl-hello-check");
	if (rs)
		goto ruleset_found;

	rs = create_tcpcheck_ruleset("*ssl-hello-check");
	if (rs == NULL) {
		ha_alert("parsing [%s:%d] : out of memory.\n", file, line);
		goto error;
	}

	chk = parse_tcpcheck_send((char *[]){"tcp-check", "send-binary", sslv3_client_hello, "log-format", ""},
				  1, curpx, &rs->rules, file, line, &errmsg);
	if (!chk) {
		ha_alert("parsing [%s:%d] : %s\n", file, line, errmsg);
		goto error;
	}
	chk->index = 0;
	LIST_ADDQ(&rs->rules, &chk->list);

	chk = parse_tcpcheck_expect((char *[]){"tcp-check", "expect", "rbinary", "^1[56]",
				                "min-recv", "5", "ok-status", "L6OK",
				                "error-status", "L6RSP", "tout-status", "L6TOUT",
				                ""},
		                    1, curpx, &rs->rules, TCPCHK_RULES_SSL3_CHK, file, line, &errmsg);
	if (!chk) {
		ha_alert("parsing [%s:%d] : %s\n", file, line, errmsg);
		goto error;
	}
	chk->index = 1;
	LIST_ADDQ(&rs->rules, &chk->list);

	ebis_insert(&shared_tcpchecks, &rs->node);

  ruleset_found:
	rules->list = &rs->rules;
	rules->flags |= TCPCHK_RULES_SSL3_CHK;

  out:
	free(errmsg);
	return err_code;

  error:
	free_tcpcheck_ruleset(rs);
	err_code |= ERR_ALERT | ERR_FATAL;
	goto out;
}

/* Parses the "option smtpchk" proxy keyword */
int proxy_parse_smtpchk_opt(char **args, int cur_arg, struct proxy *curpx, struct proxy *defpx,
			    const char *file, int line)
{
	static char *smtp_req = "%[var(check.smtp_cmd)]\r\n";

	struct tcpcheck_ruleset *rs = NULL;
	struct tcpcheck_rules *rules = &curpx->tcpcheck_rules;
	struct tcpcheck_rule *chk;
	struct tcpcheck_var *var = NULL;
	char *cmd = NULL, *errmsg = NULL;
	int err_code = 0;

	if (warnifnotcap(curpx, PR_CAP_BE, file, line, args[cur_arg+1], NULL))
		err_code |= ERR_WARN;

	if (alertif_too_many_args_idx(2, 1, file, line, args, &err_code))
		goto out;

	curpx->options2 &= ~PR_O2_CHK_ANY;
	curpx->options2 |= PR_O2_TCPCHK_CHK;

	free_tcpcheck_vars(&rules->preset_vars);
	rules->list  = NULL;
	rules->flags = 0;

	cur_arg += 2;
	if (*args[cur_arg] && *args[cur_arg+1] &&
	    (strcmp(args[cur_arg], "EHLO") == 0 || strcmp(args[cur_arg], "HELO") == 0)) {
		cmd = calloc(strlen(args[cur_arg]) + strlen(args[cur_arg+1]) + 1, sizeof(*cmd));
		if (cmd)
			sprintf(cmd, "%s %s", args[cur_arg], args[cur_arg+1]);
	}
	else {
		/* this just hits the default for now, but you could potentially expand it to allow for other stuff
		   though, it's unlikely you'd want to send anything other than an EHLO or HELO */
		cmd = strdup("HELO localhost");
	}

	var = create_tcpcheck_var(ist("check.smtp_cmd"));
	if (cmd == NULL || var == NULL) {
		ha_alert("parsing [%s:%d] : out of memory.\n", file, line);
		goto error;
	}
	var->data.type = SMP_T_STR;
	var->data.u.str.area = cmd;
	var->data.u.str.data = strlen(cmd);
	LIST_INIT(&var->list);
	LIST_ADDQ(&rules->preset_vars, &var->list);
	cmd = NULL;
	var = NULL;

	rs = find_tcpcheck_ruleset("*smtp-check");
	if (rs)
		goto ruleset_found;

	rs = create_tcpcheck_ruleset("*smtp-check");
	if (rs == NULL) {
		ha_alert("parsing [%s:%d] : out of memory.\n", file, line);
		goto error;
	}

	chk = parse_tcpcheck_connect((char *[]){"tcp-check", "connect", "default", "linger", ""},
				     1, curpx, &rs->rules, file, line, &errmsg);
	if (!chk) {
		ha_alert("parsing [%s:%d] : %s\n", file, line, errmsg);
		goto error;
	}
	chk->index = 0;
	LIST_ADDQ(&rs->rules, &chk->list);

	chk = parse_tcpcheck_expect((char *[]){"tcp-check", "expect", "rstring", "^[0-9]{3}[ \r]",
				               "min-recv", "4",
				               "error-status", "L7RSP",
				               "on-error", "%[check.payload(),cut_crlf]",
				               ""},
		                    1, curpx, &rs->rules, TCPCHK_RULES_SMTP_CHK, file, line, &errmsg);
	if (!chk) {
		ha_alert("parsing [%s:%d] : %s\n", file, line, errmsg);
		goto error;
	}
	chk->index = 1;
	LIST_ADDQ(&rs->rules, &chk->list);

	chk = parse_tcpcheck_expect((char *[]){"tcp-check", "expect", "rstring", "^2[0-9]{2}[ \r]",
				               "min-recv", "4",
				               "error-status", "L7STS",
				               "on-error", "%[check.payload(4,0),ltrim(' '),cut_crlf]",
				               "status-code", "check.payload(0,3)",
				               ""},
		                    1, curpx, &rs->rules, TCPCHK_RULES_SMTP_CHK, file, line, &errmsg);
	if (!chk) {
		ha_alert("parsing [%s:%d] : %s\n", file, line, errmsg);
		goto error;
	}
	chk->index = 2;
	LIST_ADDQ(&rs->rules, &chk->list);

	chk = parse_tcpcheck_send((char *[]){"tcp-check", "send", smtp_req, "log-format", ""},
				  1, curpx, &rs->rules, file, line, &errmsg);
	if (!chk) {
		ha_alert("parsing [%s:%d] : %s\n", file, line, errmsg);
		goto error;
	}
	chk->index = 3;
	LIST_ADDQ(&rs->rules, &chk->list);

	chk = parse_tcpcheck_expect((char *[]){"tcp-check", "expect", "rstring", "^2[0-9]{2}[- \r]",
				               "min-recv", "4",
				               "error-status", "L7STS",
				               "on-error", "%[check.payload(4,0),ltrim(' '),cut_crlf]",
				               "on-success", "%[check.payload(4,0),ltrim(' '),cut_crlf]",
				               "status-code", "check.payload(0,3)",
				               ""},
		                    1, curpx, &rs->rules, TCPCHK_RULES_SMTP_CHK, file, line, &errmsg);
	if (!chk) {
		ha_alert("parsing [%s:%d] : %s\n", file, line, errmsg);
		goto error;
	}
	chk->index = 4;
	LIST_ADDQ(&rs->rules, &chk->list);

	ebis_insert(&shared_tcpchecks, &rs->node);

  ruleset_found:
	rules->list = &rs->rules;
	rules->flags |= TCPCHK_RULES_SMTP_CHK;

  out:
	free(errmsg);
	return err_code;

  error:
	free(cmd);
	free(var);
	free_tcpcheck_vars(&rules->preset_vars);
	free_tcpcheck_ruleset(rs);
	err_code |= ERR_ALERT | ERR_FATAL;
	goto out;
}

/* Parses the "option pgsql-check" proxy keyword */
int proxy_parse_pgsql_check_opt(char **args, int cur_arg, struct proxy *curpx, struct proxy *defpx,
				const char *file, int line)
{
	static char pgsql_req[] = {
		"%[var(check.plen),htonl,hex]" /* The packet length*/
		"00030000"                     /* the version 3.0 */
		"7573657200"                   /* "user" key */
		"%[var(check.username),hex]00" /* the username */
		"00"
	};

	struct tcpcheck_ruleset *rs = NULL;
	struct tcpcheck_rules *rules = &curpx->tcpcheck_rules;
	struct tcpcheck_rule *chk;
	struct tcpcheck_var *var = NULL;
	char *user = NULL, *errmsg = NULL;
	size_t packetlen = 0;
	int err_code = 0;

	if (warnifnotcap(curpx, PR_CAP_BE, file, line, args[cur_arg+1], NULL))
		err_code |= ERR_WARN;

	if (alertif_too_many_args_idx(2, 1, file, line, args, &err_code))
		goto out;

	curpx->options2 &= ~PR_O2_CHK_ANY;
	curpx->options2 |= PR_O2_TCPCHK_CHK;

	free_tcpcheck_vars(&rules->preset_vars);
	rules->list  = NULL;
	rules->flags = 0;

	cur_arg += 2;
	if (!*args[cur_arg] || !*args[cur_arg+1]) {
		ha_alert("parsing [%s:%d] : '%s %s' expects 'user <username>' as argument.\n",
			 file, line, args[0], args[1]);
		goto error;
	}
	if (strcmp(args[cur_arg], "user") == 0) {
		packetlen = 15 + strlen(args[cur_arg+1]);
		user = strdup(args[cur_arg+1]);

		var = create_tcpcheck_var(ist("check.username"));
		if (user == NULL || var == NULL) {
			ha_alert("parsing [%s:%d] : out of memory.\n", file, line);
			goto error;
		}
		var->data.type = SMP_T_STR;
		var->data.u.str.area = user;
		var->data.u.str.data = strlen(user);
		LIST_INIT(&var->list);
		LIST_ADDQ(&rules->preset_vars, &var->list);
		user = NULL;
		var = NULL;

		var = create_tcpcheck_var(ist("check.plen"));
		if (var == NULL) {
			ha_alert("parsing [%s:%d] : out of memory.\n", file, line);
			goto error;
		}
		var->data.type = SMP_T_SINT;
		var->data.u.sint = packetlen;
		LIST_INIT(&var->list);
		LIST_ADDQ(&rules->preset_vars, &var->list);
		var = NULL;
	}
	else {
		ha_alert("parsing [%s:%d] : '%s %s' only supports optional values: 'user'.\n",
			 file, line, args[0], args[1]);
		goto error;
	}

	rs = find_tcpcheck_ruleset("*pgsql-check");
	if (rs)
		goto ruleset_found;

	rs = create_tcpcheck_ruleset("*pgsql-check");
	if (rs == NULL) {
		ha_alert("parsing [%s:%d] : out of memory.\n", file, line);
		goto error;
	}

	chk = parse_tcpcheck_connect((char *[]){"tcp-check", "connect", "default", "linger", ""},
				     1, curpx, &rs->rules, file, line, &errmsg);
	if (!chk) {
		ha_alert("parsing [%s:%d] : %s\n", file, line, errmsg);
		goto error;
	}
	chk->index = 0;
	LIST_ADDQ(&rs->rules, &chk->list);

	chk = parse_tcpcheck_send((char *[]){"tcp-check", "send-binary", pgsql_req, "log-format", ""},
				  1, curpx, &rs->rules, file, line, &errmsg);
	if (!chk) {
		ha_alert("parsing [%s:%d] : %s\n", file, line, errmsg);
		goto error;
	}
	chk->index = 1;
	LIST_ADDQ(&rs->rules, &chk->list);

	chk = parse_tcpcheck_expect((char *[]){"tcp-check", "expect", "!rstring", "^E",
				               "min-recv", "5",
				               "error-status", "L7RSP",
				               "on-error", "%[check.payload(6,0)]",
				               ""},
		                    1, curpx, &rs->rules, TCPCHK_RULES_PGSQL_CHK, file, line, &errmsg);
	if (!chk) {
		ha_alert("parsing [%s:%d] : %s\n", file, line, errmsg);
		goto error;
	}
	chk->index = 2;
	LIST_ADDQ(&rs->rules, &chk->list);

	chk = parse_tcpcheck_expect((char *[]){"tcp-check", "expect", "rbinary", "^520000000800000000",
				               "min-recv", "9",
				               "error-status", "L7STS",
				               "on-success", "PostgreSQL server is ok",
				               "on-error",   "PostgreSQL unknown error",
				               ""},
		                    1, curpx, &rs->rules, TCPCHK_RULES_PGSQL_CHK, file, line, &errmsg);
	if (!chk) {
		ha_alert("parsing [%s:%d] : %s\n", file, line, errmsg);
		goto error;
	}
	chk->index = 3;
	LIST_ADDQ(&rs->rules, &chk->list);

	ebis_insert(&shared_tcpchecks, &rs->node);

  ruleset_found:
	rules->list = &rs->rules;
	rules->flags |= TCPCHK_RULES_PGSQL_CHK;

  out:
	free(errmsg);
	return err_code;

  error:
	free(user);
	free(var);
	free_tcpcheck_vars(&rules->preset_vars);
	free_tcpcheck_ruleset(rs);
	err_code |= ERR_ALERT | ERR_FATAL;
	goto out;
}


/* Parses the "option mysql-check" proxy keyword */
int proxy_parse_mysql_check_opt(char **args, int cur_arg, struct proxy *curpx, struct proxy *defpx,
				const char *file, int line)
{
	/* This is an example of a MySQL >=4.0 client Authentication packet kindly provided by Cyril Bonte.
	 * const char mysql40_client_auth_pkt[] = {
	 * 	"\x0e\x00\x00"	// packet length
	 * 	"\x01"		// packet number
	 * 	"\x00\x00"	// client capabilities
	 * 	"\x00\x00\x01"	// max packet
	 * 	"haproxy\x00"	// username (null terminated string)
	 * 	"\x00"		// filler (always 0x00)
	 * 	"\x01\x00\x00"	// packet length
	 * 	"\x00"		// packet number
	 * 	"\x01"		// COM_QUIT command
	 * };
	 */
	static char mysql40_rsname[] = "*mysql40-check";
	static char mysql40_req[] = {
		"%[var(check.header),hex]"     /* 3 bytes for the packet length and 1 byte for the sequence ID */
		"0080"                         /* client capabilities */
		"000001"                       /* max packet */
		"%[var(check.username),hex]00" /* the username */
		"00"                           /* filler (always 0x00) */
		"010000"                       /* packet length*/
		"00"                           /* sequence ID */
		"01"                           /* COM_QUIT command */
	};

	/* This is an example of a MySQL >=4.1  client Authentication packet provided by Nenad Merdanovic.
	 * const char mysql41_client_auth_pkt[] = {
	 * 	"\x0e\x00\x00\"		// packet length
	 * 	"\x01"			// packet number
	 * 	"\x00\x00\x00\x00"	// client capabilities
	 * 	"\x00\x00\x00\x01"	// max packet
	 *	"\x21"			// character set (UTF-8)
	 *	char[23]		// All zeroes
	 * 	"haproxy\x00"		// username (null terminated string)
	 * 	"\x00"			// filler (always 0x00)
	 * 	"\x01\x00\x00"		// packet length
	 * 	"\x00"			// packet number
	 * 	"\x01"			// COM_QUIT command
	 * };
	 */
	static char mysql41_rsname[] = "*mysql41-check";
	static char mysql41_req[] = {
		"%[var(check.header),hex]"     /* 3 bytes for the packet length and 1 byte for the sequence ID */
		"00820000"                     /* client capabilities */
		"00800001"                     /* max packet */
		"21"                           /* character set (UTF-8) */
		"000000000000000000000000"     /* 23 bytes, al zeroes */
		"0000000000000000000000"
		"%[var(check.username),hex]00" /* the username */
		"00"                           /* filler (always 0x00) */
		"010000"                       /* packet length*/
		"00"                           /* sequence ID */
		"01"                           /* COM_QUIT command */
	};

	struct tcpcheck_ruleset *rs = NULL;
	struct tcpcheck_rules *rules = &curpx->tcpcheck_rules;
	struct tcpcheck_rule *chk;
	struct tcpcheck_var *var = NULL;
	char *mysql_rsname = "*mysql-check";
	char *mysql_req = NULL, *hdr = NULL, *user = NULL, *errmsg = NULL;
	int index = 0, err_code = 0;

	if (warnifnotcap(curpx, PR_CAP_BE, file, line, args[cur_arg+1], NULL))
		err_code |= ERR_WARN;

	if (alertif_too_many_args_idx(3, 1, file, line, args, &err_code))
		goto out;

	curpx->options2 &= ~PR_O2_CHK_ANY;
	curpx->options2 |= PR_O2_TCPCHK_CHK;

	free_tcpcheck_vars(&rules->preset_vars);
	rules->list  = NULL;
	rules->flags = 0;

	cur_arg += 2;
	if (*args[cur_arg]) {
		char *user;
		int packetlen, userlen;

		if (strcmp(args[cur_arg], "user") != 0) {
			ha_alert("parsing [%s:%d] : '%s %s' only supports optional values: 'user' (got '%s').\n",
				 file, line, args[0], args[1], args[cur_arg]);
			goto error;
		}

		if (*(args[cur_arg+1]) == 0) {
			ha_alert("parsing [%s:%d] : '%s %s %s' expects <username> as argument.\n",
				 file, line, args[0], args[1], args[cur_arg]);
			goto error;
		}

		hdr     = calloc(4, sizeof(*hdr));
		user    = strdup(args[cur_arg+1]);
		userlen = strlen(args[cur_arg+1]);

		if (hdr == NULL || user == NULL) {
			ha_alert("parsing [%s:%d] : out of memory.\n", file, line);
			goto error;
		}

		if (*args[cur_arg+2]) {
			if (strcmp(args[cur_arg+2], "post-41") != 0) {
				ha_alert("parsing [%s:%d] : keyword '%s' only supports option 'post-41' (got '%s').\n",
					 file, line, args[cur_arg], args[cur_arg+2]);
				goto error;
			}
			packetlen = userlen + 7 + 27;
			mysql_req = mysql41_req;
			mysql_rsname  = mysql41_rsname;
		}
		else {
			packetlen = userlen + 7;
			mysql_req = mysql40_req;
			mysql_rsname  = mysql40_rsname;
		}

		hdr[0] = (unsigned char)(packetlen & 0xff);
		hdr[1] = (unsigned char)((packetlen >> 8) & 0xff);
		hdr[2] = (unsigned char)((packetlen >> 16) & 0xff);
		hdr[3] = 1;

		var = create_tcpcheck_var(ist("check.header"));
		if (var == NULL) {
			ha_alert("parsing [%s:%d] : out of memory.\n", file, line);
			goto error;
		}
		var->data.type = SMP_T_STR;
		var->data.u.str.area = hdr;
		var->data.u.str.data = 4;
		LIST_INIT(&var->list);
		LIST_ADDQ(&rules->preset_vars, &var->list);
		hdr = NULL;
		var = NULL;

		var = create_tcpcheck_var(ist("check.username"));
		if (var == NULL) {
			ha_alert("parsing [%s:%d] : out of memory.\n", file, line);
			goto error;
		}
		var->data.type = SMP_T_STR;
		var->data.u.str.area = user;
		var->data.u.str.data = strlen(user);
		LIST_INIT(&var->list);
		LIST_ADDQ(&rules->preset_vars, &var->list);
		user = NULL;
		var = NULL;
	}

	rs = find_tcpcheck_ruleset(mysql_rsname);
	if (rs)
		goto ruleset_found;

	rs = create_tcpcheck_ruleset(mysql_rsname);
	if (rs == NULL) {
		ha_alert("parsing [%s:%d] : out of memory.\n", file, line);
		goto error;
	}

	chk = parse_tcpcheck_connect((char *[]){"tcp-check", "connect", "default", "linger", ""},
				     1, curpx, &rs->rules, file, line, &errmsg);
	if (!chk) {
		ha_alert("parsing [%s:%d] : %s\n", file, line, errmsg);
		goto error;
	}
	chk->index = index++;
	LIST_ADDQ(&rs->rules, &chk->list);

	if (mysql_req) {
		chk = parse_tcpcheck_send((char *[]){"tcp-check", "send-binary", mysql_req, "log-format", ""},
					  1, curpx, &rs->rules, file, line, &errmsg);
		if (!chk) {
			ha_alert("parsing [%s:%d] : %s\n", file, line, errmsg);
			goto error;
		}
		chk->index = index++;
		LIST_ADDQ(&rs->rules, &chk->list);
	}

	chk = parse_tcpcheck_expect((char *[]){"tcp-check", "expect", "custom", ""},
		                    1, curpx, &rs->rules, TCPCHK_RULES_MYSQL_CHK, file, line, &errmsg);
	if (!chk) {
		ha_alert("parsing [%s:%d] : %s\n", file, line, errmsg);
		goto error;
	}
	chk->expect.custom = tcpcheck_mysql_expect_iniths;
	chk->index = index++;
	LIST_ADDQ(&rs->rules, &chk->list);

	if (mysql_req) {
		chk = parse_tcpcheck_expect((char *[]){"tcp-check", "expect", "custom", ""},
					    1, curpx, &rs->rules, TCPCHK_RULES_MYSQL_CHK, file, line, &errmsg);
		if (!chk) {
			ha_alert("parsing [%s:%d] : %s\n", file, line, errmsg);
			goto error;
		}
		chk->expect.custom = tcpcheck_mysql_expect_ok;
		chk->index = index++;
		LIST_ADDQ(&rs->rules, &chk->list);
	}

	ebis_insert(&shared_tcpchecks, &rs->node);

  ruleset_found:
	rules->list = &rs->rules;
	rules->flags |= TCPCHK_RULES_MYSQL_CHK;

  out:
	free(errmsg);
	return err_code;

  error:
	free(hdr);
	free(user);
	free(var);
	free_tcpcheck_vars(&rules->preset_vars);
	free_tcpcheck_ruleset(rs);
	err_code |= ERR_ALERT | ERR_FATAL;
	goto out;
}

int proxy_parse_ldap_check_opt(char **args, int cur_arg, struct proxy *curpx, struct proxy *defpx,
			       const char *file, int line)
{
	static char *ldap_req = "300C020101600702010304008000";

	struct tcpcheck_ruleset *rs = NULL;
	struct tcpcheck_rules *rules = &curpx->tcpcheck_rules;
	struct tcpcheck_rule *chk;
	char *errmsg = NULL;
	int err_code = 0;

	if (warnifnotcap(curpx, PR_CAP_BE, file, line, args[cur_arg+1], NULL))
		err_code |= ERR_WARN;

	if (alertif_too_many_args_idx(0, 1, file, line, args, &err_code))
		goto out;

	curpx->options2 &= ~PR_O2_CHK_ANY;
	curpx->options2 |= PR_O2_TCPCHK_CHK;

	free_tcpcheck_vars(&rules->preset_vars);
	rules->list  = NULL;
	rules->flags = 0;

	rs = find_tcpcheck_ruleset("*ldap-check");
	if (rs)
		goto ruleset_found;

	rs = create_tcpcheck_ruleset("*ldap-check");
	if (rs == NULL) {
		ha_alert("parsing [%s:%d] : out of memory.\n", file, line);
		goto error;
	}

	chk = parse_tcpcheck_send((char *[]){"tcp-check", "send-binary", ldap_req, ""},
				  1, curpx, &rs->rules, file, line, &errmsg);
	if (!chk) {
		ha_alert("parsing [%s:%d] : %s\n", file, line, errmsg);
		goto error;
	}
	chk->index = 0;
	LIST_ADDQ(&rs->rules, &chk->list);

	chk = parse_tcpcheck_expect((char *[]){"tcp-check", "expect", "rbinary", "^30",
				               "min-recv", "14",
				               "on-error", "Not LDAPv3 protocol",
				               ""},
		                    1, curpx, &rs->rules, TCPCHK_RULES_LDAP_CHK, file, line, &errmsg);
	if (!chk) {
		ha_alert("parsing [%s:%d] : %s\n", file, line, errmsg);
		goto error;
	}
	chk->index = 1;
	LIST_ADDQ(&rs->rules, &chk->list);

	chk = parse_tcpcheck_expect((char *[]){"tcp-check", "expect", "custom", ""},
		                    1, curpx, &rs->rules, TCPCHK_RULES_LDAP_CHK, file, line, &errmsg);
	if (!chk) {
		ha_alert("parsing [%s:%d] : %s\n", file, line, errmsg);
		goto error;
	}
	chk->expect.custom = tcpcheck_ldap_expect_bindrsp;
	chk->index = 2;
	LIST_ADDQ(&rs->rules, &chk->list);

	ebis_insert(&shared_tcpchecks, &rs->node);

  ruleset_found:
	rules->list = &rs->rules;
	rules->flags |= TCPCHK_RULES_LDAP_CHK;

  out:
	free(errmsg);
	return err_code;

  error:
	free_tcpcheck_ruleset(rs);
	err_code |= ERR_ALERT | ERR_FATAL;
	goto out;
}

int proxy_parse_spop_check_opt(char **args, int cur_arg, struct proxy *curpx, struct proxy *defpx,
			       const char *file, int line)
{
	struct tcpcheck_ruleset *rs = NULL;
	struct tcpcheck_rules *rules = &curpx->tcpcheck_rules;
	struct tcpcheck_rule *chk;
	char *spop_req = NULL;
	char *errmsg = NULL;
	int spop_len = 0, err_code = 0;

	if (warnifnotcap(curpx, PR_CAP_BE, file, line, args[cur_arg+1], NULL))
		err_code |= ERR_WARN;

	if (alertif_too_many_args_idx(0, 1, file, line, args, &err_code))
		goto out;

	curpx->options2 &= ~PR_O2_CHK_ANY;
	curpx->options2 |= PR_O2_TCPCHK_CHK;

	free_tcpcheck_vars(&rules->preset_vars);
	rules->list  = NULL;
	rules->flags = 0;


	rs = find_tcpcheck_ruleset("*spop-check");
	if (rs)
		goto ruleset_found;

	rs = create_tcpcheck_ruleset("*spop-check");
	if (rs == NULL) {
		ha_alert("parsing [%s:%d] : out of memory.\n", file, line);
		goto error;
	}

	if (spoe_prepare_healthcheck_request(&spop_req, &spop_len) == -1) {
		ha_alert("parsing [%s:%d] : out of memory.\n", file, line);
		goto error;
	}
	chunk_reset(&trash);
	dump_binary(&trash, spop_req, spop_len);
	trash.area[trash.data] = '\0';

	chk = parse_tcpcheck_send((char *[]){"tcp-check", "send-binary", b_head(&trash), ""},
				  1, curpx, &rs->rules, file, line, &errmsg);
	if (!chk) {
		ha_alert("parsing [%s:%d] : %s\n", file, line, errmsg);
		goto error;
	}
	chk->index = 0;
	LIST_ADDQ(&rs->rules, &chk->list);

	chk = parse_tcpcheck_expect((char *[]){"tcp-check", "expect", "custom", "min-recv", "4", ""},
		                    1, curpx, &rs->rules, TCPCHK_RULES_SPOP_CHK, file, line, &errmsg);
	if (!chk) {
		ha_alert("parsing [%s:%d] : %s\n", file, line, errmsg);
		goto error;
	}
	chk->expect.custom = tcpcheck_spop_expect_agenthello;
	chk->index = 1;
	LIST_ADDQ(&rs->rules, &chk->list);

	ebis_insert(&shared_tcpchecks, &rs->node);

  ruleset_found:
	rules->list = &rs->rules;
	rules->flags |= TCPCHK_RULES_SPOP_CHK;

  out:
	free(spop_req);
	free(errmsg);
	return err_code;

  error:
	free_tcpcheck_ruleset(rs);
	err_code |= ERR_ALERT | ERR_FATAL;
	goto out;
}


struct tcpcheck_rule *proxy_parse_httpchk_req(char **args, int cur_arg, struct proxy *px, char **errmsg)
{
	struct tcpcheck_rule *chk = NULL;
	struct tcpcheck_http_hdr *hdr = NULL;
	char *meth = NULL, *uri = NULL, *vsn = NULL;
	char *hdrs, *body;

	hdrs = (*args[cur_arg+2] ? strstr(args[cur_arg+2], "\r\n") : NULL);
	body = (*args[cur_arg+2] ? strstr(args[cur_arg+2], "\r\n\r\n") : NULL);
	if (hdrs == body)
		hdrs = NULL;
	if (hdrs) {
		*hdrs = '\0';
		hdrs +=2;
	}
	if (body) {
		*body = '\0';
		body += 4;
	}
	if (hdrs || body) {
		memprintf(errmsg, "hiding headers or body at the end of the version string is deprecated."
			  " Please, consider to use 'http-check send' directive instead.");
	}

	chk = calloc(1, sizeof(*chk));
	if (!chk) {
		memprintf(errmsg, "out of memory");
		goto error;
	}
	chk->action    = TCPCHK_ACT_SEND;
	chk->send.type = TCPCHK_SEND_HTTP;
	chk->send.http.flags |= TCPCHK_SND_HTTP_FROM_OPT;
	chk->send.http.meth.meth = HTTP_METH_OPTIONS;
	LIST_INIT(&chk->send.http.hdrs);

	/* Copy the method, uri and version */
	if (*args[cur_arg]) {
		if (!*args[cur_arg+1])
			uri = args[cur_arg];
		else
			meth = args[cur_arg];
	}
	if (*args[cur_arg+1])
		uri = args[cur_arg+1];
	if (*args[cur_arg+2])
		vsn = args[cur_arg+2];

	if (meth) {
		chk->send.http.meth.meth = find_http_meth(meth, strlen(meth));
		chk->send.http.meth.str.area = strdup(meth);
		chk->send.http.meth.str.data = strlen(meth);
		if (!chk->send.http.meth.str.area) {
			memprintf(errmsg, "out of memory");
			goto error;
		}
	}
	if (uri) {
		chk->send.http.uri = ist2(strdup(uri), strlen(uri));
		if (!isttest(chk->send.http.uri)) {
			memprintf(errmsg, "out of memory");
			goto error;
		}
	}
	if (vsn) {
		chk->send.http.vsn = ist2(strdup(vsn), strlen(vsn));
		if (!isttest(chk->send.http.vsn)) {
			memprintf(errmsg, "out of memory");
			goto error;
		}
	}

	/* Copy the header */
	if (hdrs) {
		struct http_hdr tmp_hdrs[global.tune.max_http_hdr];
		struct h1m h1m;
		int i, ret;

		/* Build and parse the request */
		chunk_printf(&trash, "%s\r\n\r\n", hdrs);

		h1m.flags = H1_MF_HDRS_ONLY;
		ret = h1_headers_to_hdr_list(b_orig(&trash), b_tail(&trash),
					     tmp_hdrs, sizeof(tmp_hdrs)/sizeof(tmp_hdrs[0]),
					     &h1m, NULL);
		if (ret <= 0) {
			memprintf(errmsg, "unable to parse the request '%s'.", b_orig(&trash));
			goto error;
		}

		for (i = 0; istlen(tmp_hdrs[i].n); i++) {
			hdr = calloc(1, sizeof(*hdr));
			if (!hdr) {
				memprintf(errmsg, "out of memory");
				goto error;
			}
			LIST_INIT(&hdr->value);
			hdr->name = istdup(tmp_hdrs[i].n);
			if (!hdr->name.ptr) {
				memprintf(errmsg, "out of memory");
				goto error;
			}

			ist0(tmp_hdrs[i].v);
			if (!parse_logformat_string(istptr(tmp_hdrs[i].v), px, &hdr->value, 0, SMP_VAL_BE_CHK_RUL, errmsg))
				goto error;
			LIST_ADDQ(&chk->send.http.hdrs, &hdr->list);
		}
	}

	/* Copy the body */
	if (body) {
		chk->send.http.body = ist2(strdup(body), strlen(body));
		if (!isttest(chk->send.http.body)) {
			memprintf(errmsg, "out of memory");
			goto error;
		}
	}

	return chk;

  error:
	free_tcpcheck_http_hdr(hdr);
	free_tcpcheck(chk, 0);
	return NULL;
}

int proxy_parse_httpchk_opt(char **args, int cur_arg, struct proxy *curpx, struct proxy *defpx,
			    const char *file, int line)
{
	struct tcpcheck_ruleset *rs = NULL;
	struct tcpcheck_rules *rules = &curpx->tcpcheck_rules;
	struct tcpcheck_rule *chk;
	char *errmsg = NULL;
	int err_code = 0;

	if (warnifnotcap(curpx, PR_CAP_BE, file, line, args[cur_arg+1], NULL))
		err_code |= ERR_WARN;

	if (alertif_too_many_args_idx(3, 1, file, line, args, &err_code))
		goto out;

	chk = proxy_parse_httpchk_req(args, cur_arg+2, curpx, &errmsg);
	if (!chk) {
		ha_alert("parsing [%s:%d] : '%s %s' : %s.\n", file, line, args[0], args[1], errmsg);
		goto error;
	}
	if (errmsg) {
		ha_warning("parsing [%s:%d]: '%s %s' : %s\n", file, line, args[0], args[1], errmsg);
		err_code |= ERR_WARN;
		free(errmsg);
		errmsg = NULL;
	}

  no_request:
	curpx->options2 &= ~PR_O2_CHK_ANY;
	curpx->options2 |= PR_O2_TCPCHK_CHK;

	free_tcpcheck_vars(&rules->preset_vars);
	rules->list = NULL;
	rules->flags |= TCPCHK_SND_HTTP_FROM_OPT;

	/* Deduce the ruleset name from the proxy info */
	chunk_printf(&trash, "*http-check-%s_%s-%d",
		     ((curpx == defpx) ? "defaults" : curpx->id),
		     curpx->conf.file, curpx->conf.line);

	rs = find_tcpcheck_ruleset(b_orig(&trash));
	if (rs == NULL) {
		rs = create_tcpcheck_ruleset(b_orig(&trash));
		if (rs == NULL) {
			ha_alert("parsing [%s:%d] : out of memory.\n", file, line);
			goto error;
		}
	}

	rules->list = &rs->rules;
	rules->flags |= TCPCHK_RULES_HTTP_CHK;
	if (!tcpcheck_add_http_rule(chk, rules, &errmsg)) {
		ha_alert("parsing [%s:%d] : '%s %s' : %s.\n", file, line, args[0], args[1], errmsg);
		rules->list = NULL;
		goto error;
	}

  out:
	free(errmsg);
	return err_code;

  error:
	free_tcpcheck_ruleset(rs);
	free_tcpcheck(chk, 0);
	err_code |= ERR_ALERT | ERR_FATAL;
	goto out;
}

int proxy_parse_external_check_opt(char **args, int cur_arg, struct proxy *curpx, struct proxy *defpx,
				   const char *file, int line)
{
	int err_code = 0;

	curpx->options2 &= ~PR_O2_CHK_ANY;
	curpx->options2 |= PR_O2_EXT_CHK;
	if (alertif_too_many_args_idx(0, 1, file, line, args, &err_code))
		goto out;

  out:
	return err_code;
}

/* Parse the "addr" server keyword */
static int srv_parse_addr(char **args, int *cur_arg, struct proxy *curpx, struct server *srv,
			  char **errmsg)
{
	struct sockaddr_storage *sk;
	struct protocol *proto;
	int port1, port2, err_code = 0;


	if (!*args[*cur_arg+1]) {
		memprintf(errmsg, "'%s' expects <ipv4|ipv6> as argument.", args[*cur_arg]);
		goto error;
	}

	sk = str2sa_range(args[*cur_arg+1], NULL, &port1, &port2, errmsg, NULL, NULL, 1);
	if (!sk) {
		memprintf(errmsg, "'%s' : %s", args[*cur_arg], *errmsg);
		goto error;
	}

	proto = protocol_by_family(sk->ss_family);
	if (!proto || !proto->connect) {
		memprintf(errmsg, "'%s %s' : connect() not supported for this address family.",
		          args[*cur_arg], args[*cur_arg+1]);
		goto error;
	}

	if (port1 != port2) {
		memprintf(errmsg, "'%s' : port ranges and offsets are not allowed in '%s'.",
		          args[*cur_arg], args[*cur_arg+1]);
		goto error;
	}

	srv->check.addr = srv->agent.addr = *sk;
	srv->flags |= SRV_F_CHECKADDR;
	srv->flags |= SRV_F_AGENTADDR;

  out:
	return err_code;

 error:
	err_code |= ERR_ALERT | ERR_FATAL;
	goto out;
}


/* Parse the "agent-addr" server keyword */
static int srv_parse_agent_addr(char **args, int *cur_arg, struct proxy *curpx, struct server *srv,
				char **errmsg)
{
	int err_code = 0;

	if (!*(args[*cur_arg+1])) {
		memprintf(errmsg, "'%s' expects an address as argument.", args[*cur_arg]);
		goto error;
	}
	if(str2ip(args[*cur_arg+1], &srv->agent.addr) == NULL) {
		memprintf(errmsg, "parsing agent-addr failed. Check if '%s' is correct address.", args[*cur_arg+1]);
		goto error;
	}

  out:
	return err_code;

  error:
	err_code |= ERR_ALERT | ERR_FATAL;
	goto out;
}

/* Parse the "agent-check" server keyword */
static int srv_parse_agent_check(char **args, int *cur_arg, struct proxy *curpx, struct server *srv,
				 char **errmsg)
{
	struct tcpcheck_ruleset *rs = NULL;
	struct tcpcheck_rules *rules = srv->agent.tcpcheck_rules;
	struct tcpcheck_rule *chk;
	int err_code = 0;

	if (srv->do_agent)
		goto out;

	if (!rules) {
		rules = calloc(1, sizeof(*rules));
		if (!rules) {
			memprintf(errmsg, "out of memory.");
			goto error;
		}
		LIST_INIT(&rules->preset_vars);
		srv->agent.tcpcheck_rules = rules;
	}
	rules->list  = NULL;
	rules->flags = 0;

	rs = find_tcpcheck_ruleset("*agent-check");
	if (rs)
		goto ruleset_found;

	rs = create_tcpcheck_ruleset("*agent-check");
	if (rs == NULL) {
		memprintf(errmsg, "out of memory.");
		goto error;
	}

	chk = parse_tcpcheck_send((char *[]){"tcp-check", "send", "%[var(check.agent_string)]", "log-format", ""},
				  1, curpx, &rs->rules, srv->conf.file, srv->conf.line, errmsg);
	if (!chk) {
		memprintf(errmsg, "'%s': %s", args[*cur_arg], *errmsg);
		goto error;
	}
	chk->index = 0;
	LIST_ADDQ(&rs->rules, &chk->list);

	chk = parse_tcpcheck_expect((char *[]){"tcp-check", "expect", "custom", ""},
		                    1, curpx, &rs->rules, TCPCHK_RULES_AGENT_CHK,
				    srv->conf.file, srv->conf.line, errmsg);
	if (!chk) {
		memprintf(errmsg, "'%s': %s", args[*cur_arg], *errmsg);
		goto error;
	}
	chk->expect.custom = tcpcheck_agent_expect_reply;
	chk->index = 1;
	LIST_ADDQ(&rs->rules, &chk->list);

	ebis_insert(&shared_tcpchecks, &rs->node);

  ruleset_found:
	rules->list = &rs->rules;
	rules->flags |= TCPCHK_RULES_AGENT_CHK;
	srv->do_agent = 1;

  out:
	return 0;

  error:
	deinit_srv_agent_check(srv);
	free_tcpcheck_ruleset(rs);
	err_code |= ERR_ALERT | ERR_FATAL;
	goto out;
}

/* Parse the "agent-inter" server keyword */
static int srv_parse_agent_inter(char **args, int *cur_arg, struct proxy *curpx, struct server *srv,
				 char **errmsg)
{
	const char *err = NULL;
	unsigned int delay;
	int err_code = 0;

	if (!*(args[*cur_arg+1])) {
		memprintf(errmsg, "'%s' expects a delay as argument.", args[*cur_arg]);
		goto error;
	}

	err = parse_time_err(args[*cur_arg+1], &delay, TIME_UNIT_MS);
	if (err == PARSE_TIME_OVER) {
		memprintf(errmsg, "timer overflow in argument <%s> to <%s> of server %s, maximum value is 2147483647 ms (~24.8 days).",
			  args[*cur_arg+1], args[*cur_arg], srv->id);
		goto error;
	}
	else if (err == PARSE_TIME_UNDER) {
		memprintf(errmsg, "timer underflow in argument <%s> to <%s> of server %s, minimum non-null value is 1 ms.",
			  args[*cur_arg+1], args[*cur_arg], srv->id);
		goto error;
	}
	else if (err) {
		memprintf(errmsg, "unexpected character '%c' in 'agent-inter' argument of server %s.",
			  *err, srv->id);
		goto error;
	}
	if (delay <= 0) {
		memprintf(errmsg, "invalid value %d for argument '%s' of server %s.",
			  delay, args[*cur_arg], srv->id);
		goto error;
	}
	srv->agent.inter = delay;

  out:
	return err_code;

  error:
	err_code |= ERR_ALERT | ERR_FATAL;
	goto out;
}

/* Parse the "agent-port" server keyword */
static int srv_parse_agent_port(char **args, int *cur_arg, struct proxy *curpx, struct server *srv,
				char **errmsg)
{
	int err_code = 0;

	if (!*(args[*cur_arg+1])) {
		memprintf(errmsg, "'%s' expects a port number as argument.", args[*cur_arg]);
		goto error;
	}

	global.maxsock++;
	srv->agent.port = atol(args[*cur_arg+1]);

  out:
	return err_code;

  error:
	err_code |= ERR_ALERT | ERR_FATAL;
	goto out;
}

int set_srv_agent_send(struct server *srv, const char *send)
{
	struct tcpcheck_rules *rules = srv->agent.tcpcheck_rules;
	struct tcpcheck_var *var = NULL;
	char *str;

	str = strdup(send);
	var = create_tcpcheck_var(ist("check.agent_string"));
	if (str == NULL || var == NULL)
		goto error;

	free_tcpcheck_vars(&rules->preset_vars);

	var->data.type = SMP_T_STR;
	var->data.u.str.area = str;
	var->data.u.str.data = strlen(str);
	LIST_INIT(&var->list);
	LIST_ADDQ(&rules->preset_vars, &var->list);

	return 1;

  error:
	free(str);
	free(var);
	return 0;
}

/* Parse the "agent-send" server keyword */
static int srv_parse_agent_send(char **args, int *cur_arg, struct proxy *curpx, struct server *srv,
				char **errmsg)
{
	struct tcpcheck_rules *rules = srv->agent.tcpcheck_rules;
	int err_code = 0;

	if (!*(args[*cur_arg+1])) {
		memprintf(errmsg, "'%s' expects a string as argument.", args[*cur_arg]);
		goto error;
	}

	if (!rules) {
		rules = calloc(1, sizeof(*rules));
		if (!rules) {
			memprintf(errmsg, "out of memory.");
			goto error;
		}
		LIST_INIT(&rules->preset_vars);
		srv->agent.tcpcheck_rules = rules;
	}

	if (!set_srv_agent_send(srv, args[*cur_arg+1])) {
		memprintf(errmsg, "out of memory.");
		goto error;
	}

  out:
	return err_code;

  error:
	deinit_srv_agent_check(srv);
	err_code |= ERR_ALERT | ERR_FATAL;
	goto out;
}

/* Parse the "no-agent-send" server keyword */
static int srv_parse_no_agent_check(char **args, int *cur_arg, struct proxy *curpx, struct server *srv,
				    char **errmsg)
{
	deinit_srv_agent_check(srv);
	return 0;
}

/* Parse the "check" server keyword */
static int srv_parse_check(char **args, int *cur_arg, struct proxy *curpx, struct server *srv,
			   char **errmsg)
{
	srv->do_check = 1;
	return 0;
}

/* Parse the "check-send-proxy" server keyword */
static int srv_parse_check_send_proxy(char **args, int *cur_arg, struct proxy *curpx, struct server *srv,
				      char **errmsg)
{
	srv->check.send_proxy = 1;
	return 0;
}

/* Parse the "check-via-socks4" server keyword */
static int srv_parse_check_via_socks4(char **args, int *cur_arg, struct proxy *curpx, struct server *srv,
				      char **errmsg)
{
	srv->check.via_socks4 = 1;
	return 0;
}

/* Parse the "no-check" server keyword */
static int srv_parse_no_check(char **args, int *cur_arg, struct proxy *curpx, struct server *srv,
			      char **errmsg)
{
	deinit_srv_check(srv);
	return 0;
}

/* Parse the "no-check-send-proxy" server keyword */
static int srv_parse_no_check_send_proxy(char **args, int *cur_arg, struct proxy *curpx, struct server *srv,
					 char **errmsg)
{
	srv->check.send_proxy = 0;
	return 0;
}

/* Parse the "rise" server keyword */
static int srv_parse_check_rise(char **args, int *cur_arg, struct proxy *curpx, struct server *srv,
				char **errmsg)
{
	int err_code = 0;

	if (!*args[*cur_arg + 1]) {
		memprintf(errmsg, "'%s' expects an integer argument.", args[*cur_arg]);
		goto error;
	}

	srv->check.rise = atol(args[*cur_arg+1]);
	if (srv->check.rise <= 0) {
		memprintf(errmsg, "'%s' has to be > 0.", args[*cur_arg]);
		goto error;
	}

	if (srv->check.health)
		srv->check.health = srv->check.rise;

  out:
	return err_code;

  error:
	deinit_srv_agent_check(srv);
	err_code |= ERR_ALERT | ERR_FATAL;
	goto out;
	return 0;
}

/* Parse the "fall" server keyword */
static int srv_parse_check_fall(char **args, int *cur_arg, struct proxy *curpx, struct server *srv,
				char **errmsg)
{
	int err_code = 0;

	if (!*args[*cur_arg + 1]) {
		memprintf(errmsg, "'%s' expects an integer argument.", args[*cur_arg]);
		goto error;
	}

	srv->check.fall = atol(args[*cur_arg+1]);
	if (srv->check.fall <= 0) {
		memprintf(errmsg, "'%s' has to be > 0.", args[*cur_arg]);
		goto error;
	}

  out:
	return err_code;

  error:
	deinit_srv_agent_check(srv);
	err_code |= ERR_ALERT | ERR_FATAL;
	goto out;
	return 0;
}

/* Parse the "inter" server keyword */
static int srv_parse_check_inter(char **args, int *cur_arg, struct proxy *curpx, struct server *srv,
				 char **errmsg)
{
	const char *err = NULL;
	unsigned int delay;
	int err_code = 0;

	if (!*(args[*cur_arg+1])) {
		memprintf(errmsg, "'%s' expects a delay as argument.", args[*cur_arg]);
		goto error;
	}

	err = parse_time_err(args[*cur_arg+1], &delay, TIME_UNIT_MS);
	if (err == PARSE_TIME_OVER) {
		memprintf(errmsg, "timer overflow in argument <%s> to <%s> of server %s, maximum value is 2147483647 ms (~24.8 days).",
			  args[*cur_arg+1], args[*cur_arg], srv->id);
		goto error;
	}
	else if (err == PARSE_TIME_UNDER) {
		memprintf(errmsg, "timer underflow in argument <%s> to <%s> of server %s, minimum non-null value is 1 ms.",
			  args[*cur_arg+1], args[*cur_arg], srv->id);
		goto error;
	}
	else if (err) {
		memprintf(errmsg, "unexpected character '%c' in 'agent-inter' argument of server %s.",
			  *err, srv->id);
		goto error;
	}
	if (delay <= 0) {
		memprintf(errmsg, "invalid value %d for argument '%s' of server %s.",
			  delay, args[*cur_arg], srv->id);
		goto error;
	}
	srv->check.inter = delay;

  out:
	return err_code;

  error:
	err_code |= ERR_ALERT | ERR_FATAL;
	goto out;
}


/* Parse the "fastinter" server keyword */
static int srv_parse_check_fastinter(char **args, int *cur_arg, struct proxy *curpx, struct server *srv,
				     char **errmsg)
{
	const char *err = NULL;
	unsigned int delay;
	int err_code = 0;

	if (!*(args[*cur_arg+1])) {
		memprintf(errmsg, "'%s' expects a delay as argument.", args[*cur_arg]);
		goto error;
	}

	err = parse_time_err(args[*cur_arg+1], &delay, TIME_UNIT_MS);
	if (err == PARSE_TIME_OVER) {
		memprintf(errmsg, "timer overflow in argument <%s> to <%s> of server %s, maximum value is 2147483647 ms (~24.8 days).",
			  args[*cur_arg+1], args[*cur_arg], srv->id);
		goto error;
	}
	else if (err == PARSE_TIME_UNDER) {
		memprintf(errmsg, "timer underflow in argument <%s> to <%s> of server %s, minimum non-null value is 1 ms.",
			  args[*cur_arg+1], args[*cur_arg], srv->id);
		goto error;
	}
	else if (err) {
		memprintf(errmsg, "unexpected character '%c' in 'agent-inter' argument of server %s.",
			  *err, srv->id);
		goto error;
	}
	if (delay <= 0) {
		memprintf(errmsg, "invalid value %d for argument '%s' of server %s.",
			  delay, args[*cur_arg], srv->id);
		goto error;
	}
	srv->check.fastinter = delay;

  out:
	return err_code;

  error:
	err_code |= ERR_ALERT | ERR_FATAL;
	goto out;
}


/* Parse the "downinter" server keyword */
static int srv_parse_check_downinter(char **args, int *cur_arg, struct proxy *curpx, struct server *srv,
				     char **errmsg)
{
	const char *err = NULL;
	unsigned int delay;
	int err_code = 0;

	if (!*(args[*cur_arg+1])) {
		memprintf(errmsg, "'%s' expects a delay as argument.", args[*cur_arg]);
		goto error;
	}

	err = parse_time_err(args[*cur_arg+1], &delay, TIME_UNIT_MS);
	if (err == PARSE_TIME_OVER) {
		memprintf(errmsg, "timer overflow in argument <%s> to <%s> of server %s, maximum value is 2147483647 ms (~24.8 days).",
			  args[*cur_arg+1], args[*cur_arg], srv->id);
		goto error;
	}
	else if (err == PARSE_TIME_UNDER) {
		memprintf(errmsg, "timer underflow in argument <%s> to <%s> of server %s, minimum non-null value is 1 ms.",
			  args[*cur_arg+1], args[*cur_arg], srv->id);
		goto error;
	}
	else if (err) {
		memprintf(errmsg, "unexpected character '%c' in 'agent-inter' argument of server %s.",
			  *err, srv->id);
		goto error;
	}
	if (delay <= 0) {
		memprintf(errmsg, "invalid value %d for argument '%s' of server %s.",
			  delay, args[*cur_arg], srv->id);
		goto error;
	}
	srv->check.downinter = delay;

  out:
	return err_code;

  error:
	err_code |= ERR_ALERT | ERR_FATAL;
	goto out;
}

/* Parse the "port" server keyword */
static int srv_parse_check_port(char **args, int *cur_arg, struct proxy *curpx, struct server *srv,
				char **errmsg)
{
	int err_code = 0;

	if (!*(args[*cur_arg+1])) {
		memprintf(errmsg, "'%s' expects a port number as argument.", args[*cur_arg]);
		goto error;
	}

	global.maxsock++;
	srv->check.port = atol(args[*cur_arg+1]);
	srv->flags |= SRV_F_CHECKPORT;

  out:
	return err_code;

  error:
	err_code |= ERR_ALERT | ERR_FATAL;
	goto out;
}

static struct cfg_kw_list cfg_kws = {ILH, {
        { CFG_LISTEN, "tcp-check",      proxy_parse_tcpcheck },
        { CFG_LISTEN, "http-check",     proxy_parse_httpcheck },
        { CFG_LISTEN, "external-check", proxy_parse_extcheck },
        { 0, NULL, NULL },
}};

static struct srv_kw_list srv_kws = { "CHK", { }, {
	{ "addr",                srv_parse_addr,                1,  1 }, /* IP address to send health to or to probe from agent-check */
	{ "agent-addr",          srv_parse_agent_addr,          1,  1 }, /* Enable an auxiliary agent check */
	{ "agent-check",         srv_parse_agent_check,         0,  1 }, /* Enable agent checks */
	{ "agent-inter",         srv_parse_agent_inter,         1,  1 }, /* Set the interval between two agent checks */
	{ "agent-port",          srv_parse_agent_port,          1,  1 }, /* Set the TCP port used for agent checks. */
	{ "agent-send",          srv_parse_agent_send,          1,  1 }, /* Set string to send to agent. */
	{ "check",               srv_parse_check,               0,  1 }, /* Enable health checks */
	{ "check-send-proxy",    srv_parse_check_send_proxy,    0,  1 }, /* Enable PROXY protocol for health checks */
	{ "check-via-socks4",    srv_parse_check_via_socks4,    0,  1 }, /* Enable socks4 proxy for health checks */
	{ "no-agent-check",      srv_parse_no_agent_check,      0,  1 }, /* Do not enable any auxiliary agent check */
	{ "no-check",            srv_parse_no_check,            0,  1 }, /* Disable health checks */
	{ "no-check-send-proxy", srv_parse_no_check_send_proxy, 0,  1 }, /* Disable PROXY protol for health checks */
	{ "rise",                srv_parse_check_rise,          1,  1 }, /* Set rise value for health checks */
	{ "fall",                srv_parse_check_fall,          1,  1 }, /* Set fall value for health checks */
	{ "inter",               srv_parse_check_inter,         1,  1 }, /* Set inter value for health checks */
	{ "fastinter",           srv_parse_check_fastinter,     1,  1 }, /* Set fastinter value for health checks */
	{ "downinter",           srv_parse_check_downinter,     1,  1 }, /* Set downinter value for health checks */
	{ "port",                srv_parse_check_port,          1,  1 }, /* Set the TCP port used for health checks. */
	{ NULL, NULL, 0 },
}};

INITCALL1(STG_REGISTER, cfg_register_keywords, &cfg_kws);
INITCALL1(STG_REGISTER, srv_register_keywords, &srv_kws);

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