src/tcpcheck.c

/*
 * Health-checks functions.
 *
 * Copyright 2000-2009,2020 Willy Tarreau <w@1wt.eu>
 * Copyright 2007-2010 Krzysztof Piotr Oledzki <ole@ans.pl>
 * Copyright 2013 Baptiste Assmann <bedis9@gmail.com>
 * Copyright 2020 Gaetan Rivet <grive@u256.net>
 * Copyright 2020 Christopher Faulet <cfaulet@haproxy.com>
 *
 * 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 <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 <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 <haproxy/action.h>
#include <haproxy/api.h>
#include <haproxy/cfgparse.h>
#include <haproxy/check.h>
#include <haproxy/chunk.h>
#include <haproxy/connection.h>
#include <haproxy/errors.h>
#include <haproxy/global.h>
#include <haproxy/h1.h>
#include <haproxy/http.h>
#include <haproxy/http_htx.h>
#include <haproxy/htx.h>
#include <haproxy/istbuf.h>
#include <haproxy/list.h>
#include <haproxy/log.h>
#include <haproxy/protocol.h>
#include <haproxy/proxy-t.h>
#include <haproxy/regex.h>
#include <haproxy/sample.h>
#include <haproxy/server.h>
#include <haproxy/ssl_sock.h>
#include <haproxy/task.h>
#include <haproxy/tcpcheck.h>
#include <haproxy/time.h>
#include <haproxy/tools.h>
#include <haproxy/vars.h>


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


DECLARE_POOL(pool_head_tcpcheck_rule, "tcpcheck_rule", sizeof(struct tcpcheck_rule));

/**************************************************************************/
/*************** 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 */
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).
 */
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_HTTP_STATUS:
			free(rule->expect.codes.codes);
			break;
		case TCPCHK_EXPECT_STRING:
		case TCPCHK_EXPECT_BINARY:
		case TCPCHK_EXPECT_HTTP_BODY:
			istfree(&rule->expect.data);
			break;
		case TCPCHK_EXPECT_STRING_REGEX:
		case TCPCHK_EXPECT_BINARY_REGEX:
		case TCPCHK_EXPECT_HTTP_STATUS_REGEX:
		case TCPCHK_EXPECT_HTTP_BODY_REGEX:
			regex_free(rule->expect.regex);
			break;
		case TCPCHK_EXPECT_STRING_LF:
		case TCPCHK_EXPECT_BINARY_LF:
		case TCPCHK_EXPECT_HTTP_BODY_LF:
			free_tcpcheck_fmt(&rule->expect.fmt);
			break;
		case TCPCHK_EXPECT_HTTP_HEADER:
			if (rule->expect.flags & TCPCHK_EXPT_FL_HTTP_HNAME_REG)
				regex_free(rule->expect.hdr.name_re);
			else if (rule->expect.flags & TCPCHK_EXPT_FL_HTTP_HNAME_FMT)
				free_tcpcheck_fmt(&rule->expect.hdr.name_fmt);
			else
				istfree(&rule->expect.hdr.name);

			if (rule->expect.flags & TCPCHK_EXPT_FL_HTTP_HVAL_REG)
				regex_free(rule->expect.hdr.value_re);
			else if (rule->expect.flags & TCPCHK_EXPT_FL_HTTP_HVAL_FMT)
				free_tcpcheck_fmt(&rule->expect.hdr.value_fmt);
			else if (!(rule->expect.flags & TCPCHK_EXPT_FL_HTTP_HVAL_NONE))
				istfree(&rule->expect.hdr.value);
			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.
 */
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 */
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 */
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. */
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 and insert it in shared_tcpchecks
 * tree.
 */
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. */
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 */
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.
 */
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 protocol 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_HTTP_STATUS:
		chunk_appendf(msg, "(status codes) at step %d", tcpcheck_get_step_id(check, rule));
		break;
	case TCPCHK_EXPECT_STRING:
	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_STRING_REGEX:
	case TCPCHK_EXPECT_HTTP_STATUS_REGEX:
	case TCPCHK_EXPECT_HTTP_BODY_REGEX:
		chunk_appendf(msg, " (regex) at step %d", tcpcheck_get_step_id(check, rule));
		break;
	case TCPCHK_EXPECT_BINARY_REGEX:
		chunk_appendf(msg, " (binary regex) at step %d", tcpcheck_get_step_id(check, rule));
		break;
	case TCPCHK_EXPECT_STRING_LF:
	case TCPCHK_EXPECT_HTTP_BODY_LF:
		chunk_appendf(msg, " (log-format string) at step %d", tcpcheck_get_step_id(check, rule));
		break;
	case TCPCHK_EXPECT_BINARY_LF:
		chunk_appendf(msg, " (log-format binary) 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_HTTP_HEADER:
		chunk_appendf(msg, " (header pattern) at step %d", tcpcheck_get_step_id(check, rule));
	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_STR);

		if (smp && sample_casts[smp->data.type][SMP_T_SINT] &&
                    sample_casts[smp->data.type][SMP_T_SINT](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 protocol 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_STR);

		if (smp && sample_casts[smp->data.type][SMP_T_SINT] &&
                    sample_casts[smp->data.type][SMP_T_SINT](smp))
			check->code = smp->data.u.sint;
	}

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

/* 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 (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.
	 */
	status = ((rule->expect.ok_status != HCHK_STATUS_UNKNOWN) ? rule->expect.ok_status : HCHK_STATUS_L7OKD);
	set_server_check_status(check, 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.
 */
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.
 */
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.
 */
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;
	}

	status = ((rule->expect.ok_status != HCHK_STATUS_UNKNOWN) ? rule->expect.ok_status : HCHK_STATUS_L7OKD);
	set_server_check_status(check, 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;
}

/* 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.
 */
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;
	}

	status = ((rule->expect.ok_status != HCHK_STATUS_UNKNOWN) ? rule->expect.ok_status : HCHK_STATUS_L7OKD);
	set_server_check_status(check, 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.
 */
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.
 */
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;
	struct tcpcheck_rule *next;
	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, (s ? &s->obj_type : &proxy->obj_type));
	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)
			check->cs->conn->mux->unsubscribe(check->cs, 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;

	/* 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 (it
	 * MUST exist at this step).
	 */
	*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) {
		/* The server MUST exist here */
		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;
	next = get_next_tcpcheck_rule(check->tcpcheck_rules, rule);
	if (proto && proto->connect) {
		int flags = 0;

		if (check->tcpcheck_rules->flags & TCPCHK_RULES_PROTO_CHK)
			flags |= CONNECT_HAS_DATA;
		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_set_private(conn);
	conn->ctx = cs;

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

	/* 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;
		}
	}

  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) {
		if (conn->mux) {
			if (next && next->action == TCPCHK_ACT_SEND)
				conn->mux->subscribe(cs, SUB_RETRY_SEND, &check->wait_list);
			else
				conn->mux->subscribe(cs, SUB_RETRY_RECV, &check->wait_list);
		}
		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.
 */
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: {
		int len = b_size(&check->bo);

		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';
		if (parse_binary(b_orig(tmp),  &check->bo.area, &len, NULL) == 0)
			goto error_lf;
		check->bo.data = len;
		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]);
		if (send->http.flags & TCPCHK_SND_HTTP_FL_URI_FMT) {
			tmp->data = sess_build_logline(check->sess, NULL, b_orig(tmp), b_size(tmp), &send->http.uri_fmt);
			uri = (b_data(tmp) ? ist2(b_orig(tmp), b_data(tmp)) : ist("/"));
		}
		else
			uri = (isttest(send->http.uri) ? send->http.uri : ist("/"));
		vsn = (isttest(send->http.vsn) ? send->http.vsn : ist("HTTP/1.0"));

		if ((istlen(vsn) == 6 && *(vsn.ptr+5) == '2') ||
		    (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;
		if (!http_update_host(htx, sl, uri))
			goto error_htx;

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

			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;
				hdr_value = ist2(b_orig(tmp), b_data(tmp));
				if (!htx_add_header(htx, hdr->name, hdr_value))
					goto error_htx;
				if ((sl->flags & HTX_SL_F_HAS_AUTHORITY) && isteqi(hdr->name, ist("host"))) {
					if (!http_update_authority(htx, sl, hdr_value))
						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 (send->http.flags & TCPCHK_SND_HTTP_FL_BODY_FMT) {
			chunk_reset(tmp);
			tmp->data = sess_build_logline(check->sess, NULL, b_orig(tmp), b_size(tmp), &send->http.body_fmt);
			body = ist2(b_orig(tmp), b_data(tmp));
		}
		else
			body = send->http.body;
		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 (!htx_add_endof(htx, HTX_BLK_EOH) ||
		    (istlen(body) && !htx_add_data_atonce(htx, body)))
			goto error_htx;

		htx->flags |= HTX_FL_EOI; /* no more data are expected. Only EOM remains to add now */
		if (!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 receive data before evaluating a tcp-check expect rule. Returns
 * TCPCHK_EVAL_WAIT if it is already subscribed on receive events or if nothing
 * was received, TCPCHK_EVAL_CONTINUE to evaluate the expect rule or
 * TCPCHK_EVAL_STOP if an error occurred.
 */
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) {
			int status;

			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);

			status = ((rule->expect.err_status != HCHK_STATUS_UNKNOWN) ? rule->expect.err_status : HCHK_STATUS_L7RSP);
			set_server_check_status(check, 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.
 */
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, *tmp = NULL, *nbuf = NULL, *vbuf = NULL;
	enum healthcheck_status status = HCHK_STATUS_L7RSP;
	struct ist desc = IST_NULL;
	int i, 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;
	status = expect->err_status;

	switch (expect->type) {
	case TCPCHK_EXPECT_HTTP_STATUS:
		match = 0;
		for (i = 0; i < expect->codes.num; i++) {
			if (sl->info.res.status >= expect->codes.codes[i][0] &&
			    sl->info.res.status <= expect->codes.codes[i][1]) {
				match = 1;
				break;
			}
		}

		/* Set status and description in case of error */
		status = ((status != HCHK_STATUS_UNKNOWN) ? status : HCHK_STATUS_L7STS);
		if (LIST_ISEMPTY(&expect->onerror_fmt))
			desc = htx_sl_res_reason(sl);
		break;
	case TCPCHK_EXPECT_HTTP_STATUS_REGEX:
		match = regex_exec2(expect->regex, HTX_SL_RES_CPTR(sl), HTX_SL_RES_CLEN(sl));

		/* Set status and description in case of error */
		status = ((status != HCHK_STATUS_UNKNOWN) ? status : HCHK_STATUS_L7STS);
		if (LIST_ISEMPTY(&expect->onerror_fmt))
			desc = htx_sl_res_reason(sl);
		break;

	case TCPCHK_EXPECT_HTTP_HEADER: {
		struct http_hdr_ctx ctx;
		struct ist npat, vpat, value;
		int full = (expect->flags & (TCPCHK_EXPT_FL_HTTP_HVAL_NONE|TCPCHK_EXPT_FL_HTTP_HVAL_FULL));

		if (expect->flags & TCPCHK_EXPT_FL_HTTP_HNAME_FMT) {
			nbuf = alloc_trash_chunk();
			if (!nbuf) {
				status = HCHK_STATUS_L7RSP;
				desc = ist("Failed to allocate buffer to eval log-format string");
				goto error;
			}
			nbuf->data = sess_build_logline(check->sess, NULL, b_orig(nbuf), b_size(nbuf), &expect->hdr.name_fmt);
			if (!b_data(nbuf)) {
				status = HCHK_STATUS_L7RSP;
				desc = ist("log-format string evaluated to an empty string");
				goto error;
			}
			npat = ist2(b_orig(nbuf), b_data(nbuf));
		}
		else if (!(expect->flags & TCPCHK_EXPT_FL_HTTP_HNAME_REG))
			npat = expect->hdr.name;

		if (expect->flags & TCPCHK_EXPT_FL_HTTP_HVAL_FMT) {
			vbuf = alloc_trash_chunk();
			if (!vbuf) {
				status = HCHK_STATUS_L7RSP;
				desc = ist("Failed to allocate buffer to eval log-format string");
				goto error;
			}
			vbuf->data = sess_build_logline(check->sess, NULL, b_orig(vbuf), b_size(vbuf), &expect->hdr.value_fmt);
			if (!b_data(vbuf)) {
				status = HCHK_STATUS_L7RSP;
				desc = ist("log-format string evaluated to an empty string");
				goto error;
			}
			vpat = ist2(b_orig(vbuf), b_data(vbuf));
		}
		else if (!(expect->flags & TCPCHK_EXPT_FL_HTTP_HVAL_REG))
			vpat = expect->hdr.value;

		match = 0;
		ctx.blk = NULL;
		while (1) {
			switch (expect->flags & TCPCHK_EXPT_FL_HTTP_HNAME_TYPE) {
			case TCPCHK_EXPT_FL_HTTP_HNAME_STR:
				if (!http_find_str_header(htx, npat, &ctx, full))
					goto end_of_match;
				break;
			case TCPCHK_EXPT_FL_HTTP_HNAME_BEG:
				if (!http_find_pfx_header(htx, npat, &ctx, full))
					goto end_of_match;
				break;
			case TCPCHK_EXPT_FL_HTTP_HNAME_END:
				if (!http_find_sfx_header(htx, npat, &ctx, full))
					goto end_of_match;
				break;
			case TCPCHK_EXPT_FL_HTTP_HNAME_SUB:
				if (!http_find_sub_header(htx, npat, &ctx, full))
					goto end_of_match;
				break;
			case TCPCHK_EXPT_FL_HTTP_HNAME_REG:
				if (!http_match_header(htx, expect->hdr.name_re, &ctx, full))
					goto end_of_match;
				break;
			default:
				/* should never happen */
				goto end_of_match;
			}

			/* A header has matched the name pattern, let's test its
			 * value now (always defined from there). If there is no
			 * value pattern, it is a good match.
			 */

			if (expect->flags & TCPCHK_EXPT_FL_HTTP_HVAL_NONE) {
				match = 1;
				goto end_of_match;
			}

			value = ctx.value;
			switch (expect->flags & TCPCHK_EXPT_FL_HTTP_HVAL_TYPE) {
			case TCPCHK_EXPT_FL_HTTP_HVAL_STR:
				if (isteq(value, vpat)) {
					match = 1;
					goto end_of_match;
				}
				break;
			case TCPCHK_EXPT_FL_HTTP_HVAL_BEG:
				if (istlen(value) < istlen(vpat))
					break;
				value = ist2(istptr(value), istlen(vpat));
				if (isteq(value, vpat)) {
					match = 1;
					goto end_of_match;
				}
				break;
			case TCPCHK_EXPT_FL_HTTP_HVAL_END:
				if (istlen(value) < istlen(vpat))
					break;
				value = ist2(istptr(value) + istlen(value) - istlen(vpat), istlen(vpat));
				if (isteq(value, vpat)) {
					match = 1;
					goto end_of_match;
				}
				break;
			case TCPCHK_EXPT_FL_HTTP_HVAL_SUB:
				if (isttest(istist(value, vpat))) {
					match = 1;
					goto end_of_match;
				}
				break;
			case TCPCHK_EXPT_FL_HTTP_HVAL_REG:
				if (regex_exec2(expect->hdr.value_re, istptr(value), istlen(value))) {
					match = 1;
					goto end_of_match;
				}
				break;
			}
		}

	  end_of_match:
		status = ((status != HCHK_STATUS_UNKNOWN) ? status : HCHK_STATUS_L7STS);
		if (LIST_ISEMPTY(&expect->onerror_fmt))
			desc = htx_sl_res_reason(sl);
		break;
	}

	case TCPCHK_EXPECT_HTTP_BODY:
	case TCPCHK_EXPECT_HTTP_BODY_REGEX:
	case TCPCHK_EXPECT_HTTP_BODY_LF:
		match = 0;
		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 = ((status != HCHK_STATUS_UNKNOWN) ? status : HCHK_STATUS_L7RSP);
			if (LIST_ISEMPTY(&expect->onerror_fmt))
				desc = ist("HTTP content check could not find a response body");
			goto error;
		}

		if (expect->type == TCPCHK_EXPECT_HTTP_BODY_LF) {
			tmp = alloc_trash_chunk();
			if (!tmp) {
				status = HCHK_STATUS_L7RSP;
				desc = ist("Failed to allocate buffer to eval log-format string");
				goto error;
			}
			tmp->data = sess_build_logline(check->sess, NULL, b_orig(tmp), b_size(tmp), &expect->fmt);
			if (!b_data(tmp)) {
				status = HCHK_STATUS_L7RSP;
				desc = ist("log-format string evaluated to an empty string");
				goto error;
			}
		}

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

		/* Set status and description in case of error */
		status = ((status != HCHK_STATUS_UNKNOWN) ? status : HCHK_STATUS_L7RSP);
		if (LIST_ISEMPTY(&expect->onerror_fmt))
			desc = (inverse
				? ist("HTTP check matched unwanted content")
				: ist("HTTP content check did not match"));
		break;


	default:
		/* should never happen */
		status = ((status != HCHK_STATUS_UNKNOWN) ? 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(tmp);
	free_trash_chunk(nbuf);
	free_trash_chunk(vbuf);
	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.
 */
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, *tmp = NULL;
	struct ist desc = IST_NULL;
	enum healthcheck_status status;
	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;
	status = ((expect->err_status != HCHK_STATUS_UNKNOWN) ? expect->err_status : HCHK_STATUS_L7RSP);

	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_STRING_REGEX:
		match = regex_exec2(expect->regex, b_head(&check->bi), MIN(b_data(&check->bi), b_size(&check->bi)-1));
		break;

	case TCPCHK_EXPECT_BINARY_REGEX:
		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_STRING_LF:
	case TCPCHK_EXPECT_BINARY_LF:
		match = 0;
		tmp = alloc_trash_chunk();
		if (!tmp) {
			status = HCHK_STATUS_L7RSP;
			desc = ist("Failed to allocate buffer to eval format string");
			goto error;
		}
		tmp->data = sess_build_logline(check->sess, NULL, b_orig(tmp), b_size(tmp), &expect->fmt);
		if (!b_data(tmp)) {
			status = HCHK_STATUS_L7RSP;
			desc = ist("log-format string evaluated to an empty string");
			goto error;
		}
		if (expect->type == TCPCHK_EXPECT_BINARY_LF) {
			int len = tmp->data;
			if (parse_binary(b_orig(tmp),  &tmp->area, &len, NULL) == 0) {
				status = HCHK_STATUS_L7RSP;
				desc = ist("Failed to parse hexastring resulting of eval of a log-format string");
				goto error;
			}
			tmp->data = len;
		}
		if (b_data(&check->bi) < tmp->data) {
			if (!last_read) {
				ret = TCPCHK_EVAL_WAIT;
				goto out;
			}
			break;
		}
		match = my_memmem(b_head(&check->bi), b_data(&check->bi), b_orig(tmp), b_data(tmp)) != NULL;
		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;

  error:
	/* 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, desc);
	set_server_check_status(check, status, (msg ? b_head(msg) : NULL));
	free_trash_chunk(msg);

  out:
	free_trash_chunk(tmp);
	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 never
 * waits.
 */
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.
 */
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;
	enum tcpcheck_eval_ret eval_ret;

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

	/* Note: the conn-stream and the connection may only be undefined before
	 * the first rule evaluation (it is always a connect rule) or when the
	 * conn-stream allocation failed on the first connect.
	 */

	/* 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) {
		if (conn->flags & CO_FL_WAIT_XPRT) {
			struct tcpcheck_rule *next;

			next = get_next_tcpcheck_rule(check->tcpcheck_rules, check->current_step);
			if (next && next->action == TCPCHK_ACT_SEND) {
				if (!(check->wait_list.events & SUB_RETRY_SEND))
					conn->mux->subscribe(cs, SUB_RETRY_SEND, &check->wait_list);
				goto out;
			}
			else {
				eval_ret = tcpcheck_eval_recv(check, check->current_step);
				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;
			}
		}
		rule = LIST_NEXT(&check->current_step->list, typeof(rule), list);
	}

	/* 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 (b_data(&check->bo)) {
			/* We're already waiting to be able to send, give up */
			if (check->wait_list.events & SUB_RETRY_SEND)
				goto out;

			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->flags & CO_FL_ERROR) || (cs->flags & CS_FL_ERROR))
					goto out_end_tcpcheck;
			}
			if ((IS_HTX_CONN(conn) && !htx_is_empty(htxbuf(&check->bo))) || b_data(&check->bo)) {
				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) {
		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);

			/* Refresh conn-stream and connection */
			cs = check->cs;
			conn = cs_conn(cs);
			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;
				if (!(check->wait_list.events & SUB_RETRY_RECV))
					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;
			enum healthcheck_status status;

			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);
			status = ((rule->expect.ok_status != HCHK_STATUS_UNKNOWN) ? rule->expect.ok_status : HCHK_STATUS_L7OKD);
			set_server_check_status(check, 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 = HCHK_STATUS_L4OK;
#ifdef USE_OPENSSL
			if (ssl_sock_is_ssl(conn))
				status = HCHK_STATUS_L6OK;
#endif
			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);

  out:
	return retcode;
}


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

/* Creates a tcp-check rule resulting from parsing a custom keyword. NULL is
 * returned on error.
 */
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.
 */
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;
	const struct mux_proto_list *mux_proto = 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', "
			  "optionally 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, NULL, &proto,
			                  errmsg, NULL, NULL, PA_O_RESOLVE | PA_O_PORT_OK | PA_O_STREAM);
			if (!sk) {
				memprintf(errmsg, "'%s' : %s.", args[cur_arg], *errmsg);
				goto error;
			}

			if (!proto->connect) {
				memprintf(errmsg, "'%s' : connect() not supported for this address family.\n",
					  args[cur_arg]);
				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], "proto") == 0) {
			if (!*(args[cur_arg+1])) {
				memprintf(errmsg, "'%s' expects a MUX protocol as argument.", args[cur_arg]);
				goto error;
			}
			mux_proto = get_mux_proto(ist2(args[cur_arg+1], strlen(args[cur_arg+1])));
			if (!mux_proto) {
				memprintf(errmsg, "'%s' : unknown MUX protocol '%s'.", args[cur_arg], args[cur_arg+1]);
				goto error;
			}
			cur_arg++;
		}
		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;
	chk->connect.mux_proto= mux_proto;
	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 */
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;

	if (strcmp(args[cur_arg], "send-binary-lf") == 0)
		type = TCPCHK_SEND_BINARY_LF;
	else if (strcmp(args[cur_arg], "send-binary") == 0)
		type = TCPCHK_SEND_BINARY;
	else if (strcmp(args[cur_arg], "send-lf") == 0)
		type = TCPCHK_SEND_STRING_LF;
	else if (strcmp(args[cur_arg], "send") == 0)
		type = 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 {
			memprintf(errmsg, "expects '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_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: {
		int len = chk->send.data.len;
		if (parse_binary(data, &chk->send.data.ptr, &len, errmsg) == 0) {
			memprintf(errmsg, "'%s' invalid binary string (%s).\n", data, *errmsg);
			goto error;
		}
		chk->send.data.len = len;
		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 */
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, host_hdr = -1;

	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 || strcmp(args[cur_arg], "uri-lf") == 0) {
			if (!*(args[cur_arg+1])) {
				memprintf(errmsg, "'%s' expects a string as argument.", args[cur_arg]);
				goto error;
			}
			flags &= ~TCPCHK_SND_HTTP_FL_URI_FMT;
			if (strcmp(args[cur_arg], "uri-lf") == 0)
				flags |= TCPCHK_SND_HTTP_FL_URI_FMT;
			cur_arg++;
			uri = args[cur_arg];
		}
		else if (strcmp(args[cur_arg], "ver") == 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;
			}

			if (strcasecmp(args[cur_arg+1], "host") == 0) {
				if (host_hdr >= 0) {
					memprintf(errmsg, "'%s' header already defined (previous value is '%s')",
						  args[cur_arg+1], istptr(hdrs[host_hdr].v));
					goto error;
				}
				host_hdr = i;
			}
			else if (strcasecmp(args[cur_arg+1], "connection") == 0 ||
				 strcasecmp(args[cur_arg+1], "content-length") == 0 ||
				 strcasecmp(args[cur_arg+1], "transfer-encoding") == 0)
				goto skip_hdr;

			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++;
		  skip_hdr:
			cur_arg += 2;
		}
		else if (strcmp(args[cur_arg], "body") == 0 || strcmp(args[cur_arg], "body-lf") == 0) {
			if (!*(args[cur_arg+1])) {
				memprintf(errmsg, "'%s' expects a string as argument.", args[cur_arg]);
				goto error;
			}
			flags &= ~TCPCHK_SND_HTTP_FL_BODY_FMT;
			if (strcmp(args[cur_arg], "body-lf") == 0)
				flags |= TCPCHK_SND_HTTP_FL_BODY_FMT;
			cur_arg++;
			body = args[cur_arg];
		}
		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', 'uri-lf', 'ver', 'hdr', 'body' or 'body-lf'"
				  " 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) {
		if (chk->send.http.flags & TCPCHK_SND_HTTP_FL_URI_FMT) {
			LIST_INIT(&chk->send.http.uri_fmt);
			px->conf.args.ctx = ARGC_SRV;
			if (!parse_logformat_string(uri, px, &chk->send.http.uri_fmt, 0, SMP_VAL_BE_CHK_RUL, errmsg)) {
				memprintf(errmsg, "'%s' invalid log-format string (%s).\n", uri, *errmsg);
				goto error;
			}
		}
		else {
			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) {
		if (chk->send.http.flags & TCPCHK_SND_HTTP_FL_BODY_FMT) {
			LIST_INIT(&chk->send.http.body_fmt);
			px->conf.args.ctx = ARGC_SRV;
			if (!parse_logformat_string(body, px, &chk->send.http.body_fmt, 0, SMP_VAL_BE_CHK_RUL, errmsg)) {
				memprintf(errmsg, "'%s' invalid log-format string (%s).\n", body, *errmsg);
				goto error;
			}
		}
		else {
			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 */
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).
 */
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 *on_success_msg, *on_error_msg, *comment, *pattern, *npat, *vpat;
	enum tcpcheck_expect_type type = TCPCHK_EXPECT_UNDEF;
	enum healthcheck_status ok_st = HCHK_STATUS_UNKNOWN;
	enum healthcheck_status err_st = HCHK_STATUS_UNKNOWN;
	enum healthcheck_status tout_st = HCHK_STATUS_UNKNOWN;
	unsigned int flags = 0;
	long min_recv = -1;
	int inverse = 0;

	on_success_msg = on_error_msg = comment = pattern = npat = vpat = 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_STRING_REGEX);
			else
				type = ((*(args[cur_arg]) == 's') ? TCPCHK_EXPECT_HTTP_BODY : TCPCHK_EXPECT_HTTP_BODY_REGEX);

			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_BINARY_REGEX);

			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], "string-lf") == 0 || strcmp(args[cur_arg], "binary-lf") == 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_LF : TCPCHK_EXPECT_BINARY_LF);
			else {
				if (*(args[cur_arg]) != 's')
					goto bad_http_kw;
				type = TCPCHK_EXPECT_HTTP_BODY_LF;
			}

			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_STATUS_REGEX);

			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], "hdr") == 0 || strcmp(args[cur_arg], "fhdr") == 0) {
			int orig_arg = cur_arg;

			if (proto != TCPCHK_RULES_HTTP_CHK)
				goto bad_tcp_kw;
			if (type != TCPCHK_EXPECT_UNDEF) {
				memprintf(errmsg, "only on pattern expected");
				goto error;
			}
			type = TCPCHK_EXPECT_HTTP_HEADER;

			if (strcmp(args[cur_arg], "fhdr") == 0)
				flags |= TCPCHK_EXPT_FL_HTTP_HVAL_FULL;

			/* Parse the name pattern, mandatory */
			if (!*(args[cur_arg+1]) || !*(args[cur_arg+2]) ||
			    (strcmp(args[cur_arg+1], "name") != 0 && strcmp(args[cur_arg+1], "name-lf") != 0)) {
				memprintf(errmsg, "'%s' expects at the name keyword as first argument followed by a pattern",
					  args[orig_arg]);
				goto error;
			}

			if (strcmp(args[cur_arg+1], "name-lf") == 0)
				flags |= TCPCHK_EXPT_FL_HTTP_HNAME_FMT;

			cur_arg += 2;
			if (strcmp(args[cur_arg], "-m") == 0) {
				if  (!*(args[cur_arg+1])) {
					memprintf(errmsg, "'%s' : '%s' expects at a matching pattern ('str', 'beg', 'end', 'sub' or 'reg')",
						  args[orig_arg], args[cur_arg]);
					goto error;
				}
				if (strcmp(args[cur_arg+1], "str") == 0)
					flags |= TCPCHK_EXPT_FL_HTTP_HNAME_STR;
				else if (strcmp(args[cur_arg+1], "beg") == 0)
					flags |= TCPCHK_EXPT_FL_HTTP_HNAME_BEG;
				else if (strcmp(args[cur_arg+1], "end") == 0)
					flags |= TCPCHK_EXPT_FL_HTTP_HNAME_END;
				else if (strcmp(args[cur_arg+1], "sub") == 0)
					flags |= TCPCHK_EXPT_FL_HTTP_HNAME_SUB;
				else if (strcmp(args[cur_arg+1], "reg") == 0) {
					if (flags & TCPCHK_EXPT_FL_HTTP_HNAME_FMT) {
						memprintf(errmsg, "'%s': log-format string is not supported with a regex matching method",
							  args[orig_arg]);
						goto error;
					}
					flags |= TCPCHK_EXPT_FL_HTTP_HNAME_REG;
				}
				else {
					memprintf(errmsg, "'%s' : '%s' only supports 'str', 'beg', 'end', 'sub' or 'reg' (got '%s')",
						  args[orig_arg], args[cur_arg], args[cur_arg+1]);
					goto error;
				}
				cur_arg += 2;
			}
			else
				flags |= TCPCHK_EXPT_FL_HTTP_HNAME_STR;
			npat = args[cur_arg];

			if (!*(args[cur_arg+1]) ||
			    (strcmp(args[cur_arg+1], "value") != 0 && strcmp(args[cur_arg+1], "value-lf") != 0)) {
				flags |= TCPCHK_EXPT_FL_HTTP_HVAL_NONE;
				goto next;
			}
			if (strcmp(args[cur_arg+1], "value-lf") == 0)
				flags |= TCPCHK_EXPT_FL_HTTP_HVAL_FMT;

			/* Parse the value pattern, optional */
			if (strcmp(args[cur_arg+2], "-m") == 0) {
				cur_arg += 2;
				if  (!*(args[cur_arg+1])) {
					memprintf(errmsg, "'%s' : '%s' expects at a matching pattern ('str', 'beg', 'end', 'sub' or 'reg')",
						  args[orig_arg], args[cur_arg]);
					goto error;
				}
				if (strcmp(args[cur_arg+1], "str") == 0)
					flags |= TCPCHK_EXPT_FL_HTTP_HVAL_STR;
				else if (strcmp(args[cur_arg+1], "beg") == 0)
					flags |= TCPCHK_EXPT_FL_HTTP_HVAL_BEG;
				else if (strcmp(args[cur_arg+1], "end") == 0)
					flags |= TCPCHK_EXPT_FL_HTTP_HVAL_END;
				else if (strcmp(args[cur_arg+1], "sub") == 0)
					flags |= TCPCHK_EXPT_FL_HTTP_HVAL_SUB;
				else if (strcmp(args[cur_arg+1], "reg") == 0) {
					if (flags & TCPCHK_EXPT_FL_HTTP_HVAL_FMT) {
						memprintf(errmsg, "'%s': log-format string is not supported with a regex matching method",
							  args[orig_arg]);
						goto error;
					}
					flags |= TCPCHK_EXPT_FL_HTTP_HVAL_REG;
				}
				else {
					memprintf(errmsg, "'%s' : '%s' only supports 'str', 'beg', 'end', 'sub' or 'reg' (got '%s')",
						  args[orig_arg], args[cur_arg], args[cur_arg+1]);
					goto error;
				}
			}
			else
				flags |= TCPCHK_EXPT_FL_HTTP_HVAL_STR;

			if (!*(args[cur_arg+2])) {
				memprintf(errmsg, "'%s' expect a pattern with the value keyword", args[orig_arg]);
				goto error;
			}
			vpat = args[cur_arg+2];
			cur_arg += 2;
		}
		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++;
			on_success_msg = args[cur_arg];
		}
		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++;
			on_error_msg = args[cur_arg];
		}
		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', '[!]string-lf', '[!]status', "
					  "'[!]rstatus', [!]hdr, [!]fhdr or comment but got '%s' as argument.", args[cur_arg]);
			}
			else {
			  bad_tcp_kw:
				memprintf(errmsg, "'only supports min-recv, '[!]binary', '[!]string', '[!]rstring', '[!]string-lf'"
					  "'[!]rbinary', '[!]binary-lf' or comment but got '%s' as argument.", args[cur_arg]);
			}
			goto error;
		}
	  next:
		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 = 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;
		}
	}
	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;
		}
	}

	switch (chk->expect.type) {
	case TCPCHK_EXPECT_HTTP_STATUS: {
		const char *p = pattern;
		unsigned int c1,c2;

		chk->expect.codes.codes = NULL;
		chk->expect.codes.num   = 0;
		while (1) {
			c1 = c2 = read_uint(&p, pattern + strlen(pattern));
			if (*p == '-') {
				p++;
				c2 = read_uint(&p, pattern + strlen(pattern));
			}
			if (c1 > c2) {
				memprintf(errmsg, "invalid range of status codes '%s'", pattern);
				goto error;
			}

			chk->expect.codes.num++;
			chk->expect.codes.codes = my_realloc2(chk->expect.codes.codes,
							      chk->expect.codes.num * sizeof(*chk->expect.codes.codes));
			if (!chk->expect.codes.codes) {
				memprintf(errmsg, "out of memory");
				goto error;
			}
			chk->expect.codes.codes[chk->expect.codes.num-1][0] = c1;
			chk->expect.codes.codes[chk->expect.codes.num-1][1] = c2;

			if (*p == '\0')
				break;
			if (*p != ',') {
				memprintf(errmsg, "invalid character '%c' in the list of status codes", *p);
				goto error;
			}
			p++;
		}
		break;
	}
	case TCPCHK_EXPECT_STRING:
	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: {
		int len = chk->expect.data.len;

		if (parse_binary(pattern, &chk->expect.data.ptr, &len, errmsg) == 0) {
			memprintf(errmsg, "invalid binary string (%s)", *errmsg);
			goto error;
		}
		chk->expect.data.len = len;
		break;
	}
	case TCPCHK_EXPECT_STRING_REGEX:
	case TCPCHK_EXPECT_BINARY_REGEX:
	case TCPCHK_EXPECT_HTTP_STATUS_REGEX:
	case TCPCHK_EXPECT_HTTP_BODY_REGEX:
		chk->expect.regex = regex_comp(pattern, 1, 0, errmsg);
		if (!chk->expect.regex)
			goto error;
		break;

	case TCPCHK_EXPECT_STRING_LF:
	case TCPCHK_EXPECT_BINARY_LF:
	case TCPCHK_EXPECT_HTTP_BODY_LF:
		LIST_INIT(&chk->expect.fmt);
		px->conf.args.ctx = ARGC_SRV;
		if (!parse_logformat_string(pattern, px, &chk->expect.fmt, 0, SMP_VAL_BE_CHK_RUL, errmsg)) {
			memprintf(errmsg, "'%s' invalid log-format string (%s).\n", pattern, *errmsg);
			goto error;
		}
		break;

	case TCPCHK_EXPECT_HTTP_HEADER:
		if (!npat) {
			memprintf(errmsg, "unexpected error, undefined header name pattern");
			goto error;
		}
		if (chk->expect.flags & TCPCHK_EXPT_FL_HTTP_HNAME_REG) {
			chk->expect.hdr.name_re = regex_comp(npat, 0, 0, errmsg);
			if (!chk->expect.hdr.name_re)
				goto error;
		}
		else if (chk->expect.flags & TCPCHK_EXPT_FL_HTTP_HNAME_FMT) {
			px->conf.args.ctx = ARGC_SRV;
			LIST_INIT(&chk->expect.hdr.name_fmt);
			if (!parse_logformat_string(npat, px, &chk->expect.hdr.name_fmt, 0, SMP_VAL_BE_CHK_RUL, errmsg)) {
				memprintf(errmsg, "'%s' invalid log-format string (%s).\n", npat, *errmsg);
				goto error;
			}
		}
		else {
			chk->expect.hdr.name = ist2(strdup(npat), strlen(npat));
			if (!isttest(chk->expect.hdr.name)) {
				memprintf(errmsg, "out of memory");
				goto error;
			}
		}

		if (chk->expect.flags & TCPCHK_EXPT_FL_HTTP_HVAL_NONE) {
			chk->expect.hdr.value = IST_NULL;
			break;
		}

		if (!vpat) {
			memprintf(errmsg, "unexpected error, undefined header value pattern");
			goto error;
		}
		else if (chk->expect.flags & TCPCHK_EXPT_FL_HTTP_HVAL_REG) {
			chk->expect.hdr.value_re = regex_comp(vpat, 1, 0, errmsg);
			if (!chk->expect.hdr.value_re)
				goto error;
		}
		else if (chk->expect.flags & TCPCHK_EXPT_FL_HTTP_HVAL_FMT) {
			px->conf.args.ctx = ARGC_SRV;
			LIST_INIT(&chk->expect.hdr.value_fmt);
			if (!parse_logformat_string(vpat, px, &chk->expect.hdr.value_fmt, 0, SMP_VAL_BE_CHK_RUL, errmsg)) {
				memprintf(errmsg, "'%s' invalid log-format string (%s).\n", npat, *errmsg);
				goto error;
			}
		}
		else {
			chk->expect.hdr.value = ist2(strdup(vpat), strlen(vpat));
			if (!isttest(chk->expect.hdr.value)) {
				memprintf(errmsg, "out of memory");
				goto error;
			}
		}

		break;
	case TCPCHK_EXPECT_CUSTOM:
		chk->expect.custom = NULL; /* Must be defined by the caller ! */
		break;
	case TCPCHK_EXPECT_UNDEF:
		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(comment);
	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.
 */
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.
 */
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. Depending on the declaration order some tests are required.
	 *
	 * Some tests are 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 implicit 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, overwriting 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 && r->action != TCPCHK_ACT_EXPECT && 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;
}

/* 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", "status", "200-399", ""},
						     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 preceding 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 through */
		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_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;
	}
}

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;
}

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;
}

/* 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 ||
		 strcmp(args[cur_arg], "send-lf") == 0 || strcmp(args[cur_arg], "send-binary-lf") == 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 = (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;
}

static struct cfg_kw_list cfg_kws = {ILH, {
        { CFG_LISTEN, "tcp-check",      proxy_parse_tcpcheck },
        { 0, NULL, NULL },
}};

REGISTER_POST_PROXY_CHECK(check_proxy_tcpcheck);
REGISTER_PROXY_DEINIT(deinit_proxy_tcpcheck);
REGISTER_POST_DEINIT(deinit_tcpchecks);
INITCALL1(STG_REGISTER, cfg_register_keywords, &cfg_kws);