src/http_rules.c - haproxy - Gitiles

 /*
  * HTTP rules parsing and registration
  *
  * Copyright 2000-2018 Willy Tarreau <w@1wt.eu>
  *
  * 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/types.h>

 #include <ctype.h>
 #include <string.h>
 #include <time.h>

 #include <haproxy/acl.h>
 #include <haproxy/action.h>
 #include <haproxy/api.h>
 #include <haproxy/arg.h>
 #include <haproxy/capture-t.h>
 #include <haproxy/cfgparse.h>
 #include <haproxy/chunk.h>
 #include <haproxy/global.h>
 #include <haproxy/http.h>
 #include <haproxy/http_rules.h>
 #include <haproxy/log.h>
 #include <haproxy/pool.h>
 #include <haproxy/proxy.h>
 #include <haproxy/sample.h>
 #include <haproxy/tools.h>
 #include <haproxy/version.h>


 /* List head of all known action keywords for "http-request" */
 struct action_kw_list http_req_keywords = {
        .list = LIST_HEAD_INIT(http_req_keywords.list)
 };

 /* List head of all known action keywords for "http-response" */
 struct action_kw_list http_res_keywords = {
        .list = LIST_HEAD_INIT(http_res_keywords.list)
 };

 /* List head of all known action keywords for "http-after-response" */
 struct action_kw_list http_after_res_keywords = {
        .list = LIST_HEAD_INIT(http_after_res_keywords.list)
 };

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

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

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

 /* parse an "http-request" rule */
 struct act_rule *parse_http_req_cond(const char **args, const char *file, int linenum, struct proxy *proxy)
 {
 	struct act_rule *rule;
 	const struct action_kw *custom = NULL;
 	int cur_arg;

 	rule = calloc(1, sizeof(*rule));
 	if (!rule) {
 		ha_alert("parsing [%s:%d]: out of memory.\n", file, linenum);
 		goto out_err;
 	}
 	rule->from = ACT_F_HTTP_REQ;

 	if (((custom = action_http_req_custom(args[0])) != NULL)) {
 		char *errmsg = NULL;

 		cur_arg = 1;
 		/* try in the module list */
 		rule->kw = custom;

 		if (custom->flags & KWF_EXPERIMENTAL) {
 			if (!experimental_directives_allowed) {
 				ha_alert("parsing [%s:%d] : '%s' action is experimental, must be allowed via a global 'expose-experimental-directives'\n",
 				         file, linenum, custom->kw);
 				goto out_err;
 			}
 			mark_tainted(TAINTED_CONFIG_EXP_KW_DECLARED);
 		}

 		if (custom->parse(args, &cur_arg, proxy, rule, &errmsg) == ACT_RET_PRS_ERR) {
 			ha_alert("parsing [%s:%d] : error detected in %s '%s' while parsing 'http-request %s' rule : %s.\n",
 				 file, linenum, proxy_type_str(proxy), proxy->id, args[0], errmsg);
 			free(errmsg);
 			goto out_err;
 		}
 		else if (errmsg) {
 			ha_warning("parsing [%s:%d] : %s.\n", file, linenum, errmsg);
 			free(errmsg);
 		}
 	}
 	else {
 		const char *best = action_suggest(args[0], &http_req_keywords.list, NULL);

 		action_build_list(&http_req_keywords.list, &trash);
 		ha_alert("parsing [%s:%d]: 'http-request' expects %s, but got '%s'%s.%s%s%s\n",
 		         file, linenum, trash.area,
 		         args[0], *args[0] ? "" : " (missing argument)",
 		         best ? " Did you mean '" : "",
 		         best ? best : "",
 		         best ? "' maybe ?" : "");
 		goto out_err;
 	}

 	if (strcmp(args[cur_arg], "if") == 0 || strcmp(args[cur_arg], "unless") == 0) {
 		struct acl_cond *cond;
 		char *errmsg = NULL;

 		if ((cond = build_acl_cond(file, linenum, &proxy->acl, proxy, args+cur_arg, &errmsg)) == NULL) {
 			ha_alert("parsing [%s:%d] : error detected while parsing an 'http-request %s' condition : %s.\n",
 				 file, linenum, args[0], errmsg);
 			free(errmsg);
 			goto out_err;
 		}
 		rule->cond = cond;
 	}
 	else if (*args[cur_arg]) {
 		ha_alert("parsing [%s:%d]: 'http-request %s' expects"
 			 " either 'if' or 'unless' followed by a condition but found '%s'.\n",
 			 file, linenum, args[0], args[cur_arg]);
 		goto out_err;
 	}

 	return rule;
  out_err:
 	free(rule);
 	return NULL;
 }

 /* parse an "http-respose" rule */
 struct act_rule *parse_http_res_cond(const char **args, const char *file, int linenum, struct proxy *proxy)
 {
 	struct act_rule *rule;
 	const struct action_kw *custom = NULL;
 	int cur_arg;

 	rule = calloc(1, sizeof(*rule));
 	if (!rule) {
 		ha_alert("parsing [%s:%d]: out of memory.\n", file, linenum);
 		goto out_err;
 	}
 	rule->from = ACT_F_HTTP_RES;

 	if (((custom = action_http_res_custom(args[0])) != NULL)) {
 		char *errmsg = NULL;

 		cur_arg = 1;
 		/* try in the module list */
 		rule->kw = custom;

 		if (custom->flags & KWF_EXPERIMENTAL) {
 			if (!experimental_directives_allowed) {
 				ha_alert("parsing [%s:%d] : '%s' action is experimental, must be allowed via a global 'expose-experimental-directives'\n",
 				         file, linenum, custom->kw);
 				goto out_err;
 			}
 			mark_tainted(TAINTED_CONFIG_EXP_KW_DECLARED);
 		}

 		if (custom->parse(args, &cur_arg, proxy, rule, &errmsg) == ACT_RET_PRS_ERR) {
 			ha_alert("parsing [%s:%d] : error detected in %s '%s' while parsing 'http-response %s' rule : %s.\n",
 				 file, linenum, proxy_type_str(proxy), proxy->id, args[0], errmsg);
 			free(errmsg);
 			goto out_err;
 		}
 		else if (errmsg) {
 			ha_warning("parsing [%s:%d] : %s.\n", file, linenum, errmsg);
 			free(errmsg);
 		}
 	}
 	else {
 		const char *best = action_suggest(args[0], &http_res_keywords.list, NULL);

 		action_build_list(&http_res_keywords.list, &trash);
 		ha_alert("parsing [%s:%d]: 'http-response' expects %s, but got '%s'%s.%s%s%s\n",
 		         file, linenum, trash.area,
 		         args[0], *args[0] ? "" : " (missing argument)",
 		         best ? " Did you mean '" : "",
 		         best ? best : "",
 		         best ? "' maybe ?" : "");
 		goto out_err;
 	}

 	if (strcmp(args[cur_arg], "if") == 0 || strcmp(args[cur_arg], "unless") == 0) {
 		struct acl_cond *cond;
 		char *errmsg = NULL;

 		if ((cond = build_acl_cond(file, linenum, &proxy->acl, proxy, args+cur_arg, &errmsg)) == NULL) {
 			ha_alert("parsing [%s:%d] : error detected while parsing an 'http-response %s' condition : %s.\n",
 				 file, linenum, args[0], errmsg);
 			free(errmsg);
 			goto out_err;
 		}
 		rule->cond = cond;
 	}
 	else if (*args[cur_arg]) {
 		ha_alert("parsing [%s:%d]: 'http-response %s' expects"
 			 " either 'if' or 'unless' followed by a condition but found '%s'.\n",
 			 file, linenum, args[0], args[cur_arg]);
 		goto out_err;
 	}

 	return rule;
  out_err:
 	free(rule);
 	return NULL;
 }


 /* parse an "http-after-response" rule */
 struct act_rule *parse_http_after_res_cond(const char **args, const char *file, int linenum, struct proxy *proxy)
 {
 	struct act_rule *rule;
 	const struct action_kw *custom = NULL;
 	int cur_arg;

 	rule = calloc(1, sizeof(*rule));
 	if (!rule) {
 		ha_alert("parsing [%s:%d]: out of memory.\n", file, linenum);
 		goto out_err;
 	}
 	rule->from = ACT_F_HTTP_RES;

 	if (((custom = action_http_after_res_custom(args[0])) != NULL)) {
 		char *errmsg = NULL;

 		cur_arg = 1;
 		/* try in the module list */
 		rule->kw = custom;
 		if (custom->parse(args, &cur_arg, proxy, rule, &errmsg) == ACT_RET_PRS_ERR) {
 			ha_alert("parsing [%s:%d] : error detected in %s '%s' while parsing 'http-after-response %s' rule : %s.\n",
 				 file, linenum, proxy_type_str(proxy), proxy->id, args[0], errmsg);
 			free(errmsg);
 			goto out_err;
 		}
 		else if (errmsg) {
 			ha_warning("parsing [%s:%d] : %s.\n", file, linenum, errmsg);
 			free(errmsg);
 		}
 	}
 	else {
 		const char *best = action_suggest(args[0], &http_after_res_keywords.list, NULL);

 		action_build_list(&http_after_res_keywords.list, &trash);
 		ha_alert("parsing [%s:%d]: 'http-after-response' expects %s, but got '%s'%s.%s%s%s\n",
 		         file, linenum, trash.area,
 		         args[0], *args[0] ? "" : " (missing argument)",
 		         best ? " Did you mean '" : "",
 		         best ? best : "",
 		         best ? "' maybe ?" : "");
 		goto out_err;
 	}

 	if (strcmp(args[cur_arg], "if") == 0 || strcmp(args[cur_arg], "unless") == 0) {
 		struct acl_cond *cond;
 		char *errmsg = NULL;

 		if ((cond = build_acl_cond(file, linenum, &proxy->acl, proxy, args+cur_arg, &errmsg)) == NULL) {
 			ha_alert("parsing [%s:%d] : error detected while parsing an 'http-after-response %s' condition : %s.\n",
 				 file, linenum, args[0], errmsg);
 			free(errmsg);
 			goto out_err;
 		}
 		rule->cond = cond;
 	}
 	else if (*args[cur_arg]) {
 		ha_alert("parsing [%s:%d]: 'http-after-response %s' expects"
 			 " either 'if' or 'unless' followed by a condition but found '%s'.\n",
 			 file, linenum, args[0], args[cur_arg]);
 		goto out_err;
 	}

 	return rule;
  out_err:
 	free(rule);
 	return NULL;
 }

 /* completely free redirect rule */
 void http_free_redirect_rule(struct redirect_rule *rdr)
 {
 	struct logformat_node *lf, *lfb;

 	if (rdr->cond) {
 		prune_acl_cond(rdr->cond);
 		free(rdr->cond);
 	}
 	free(rdr->rdr_str);
 	free(rdr->cookie_str);
 	list_for_each_entry_safe(lf, lfb, &rdr->rdr_fmt, list) {
 		LIST_DELETE(&lf->list);
 		release_sample_expr(lf->expr);
 		free(lf->arg);
 		free(lf);
 	}
 	free(rdr);
 }

 /* Parses a redirect rule. Returns the redirect rule on success or NULL on error,
  * with <err> filled with the error message. If <use_fmt> is not null, builds a
  * dynamic log-format rule instead of a static string. Parameter <dir> indicates
  * the direction of the rule, and equals 0 for request, non-zero for responses.
  */
 struct redirect_rule *http_parse_redirect_rule(const char *file, int linenum, struct proxy *curproxy,
                                                const char **args, char **errmsg, int use_fmt, int dir)
 {
 	struct redirect_rule *rule = NULL;
 	int cur_arg;
 	int type = REDIRECT_TYPE_NONE;
 	int code = 302;
 	const char *destination = NULL;
 	const char *cookie = NULL;
 	int cookie_set = 0;
 	unsigned int flags = (!dir ? REDIRECT_FLAG_FROM_REQ : REDIRECT_FLAG_NONE);
 	struct acl_cond *cond = NULL;

 	cur_arg = 0;
 	while (*(args[cur_arg])) {
 		if (strcmp(args[cur_arg], "location") == 0) {
 			if (!*args[cur_arg + 1])
 				goto missing_arg;

 			type = REDIRECT_TYPE_LOCATION;
 			cur_arg++;
 			destination = args[cur_arg];
 		}
 		else if (strcmp(args[cur_arg], "prefix") == 0) {
 			if (!*args[cur_arg + 1])
 				goto missing_arg;
 			type = REDIRECT_TYPE_PREFIX;
 			cur_arg++;
 			destination = args[cur_arg];
 		}
 		else if (strcmp(args[cur_arg], "scheme") == 0) {
 			if (!*args[cur_arg + 1])
 				goto missing_arg;

 			type = REDIRECT_TYPE_SCHEME;
 			cur_arg++;
 			destination = args[cur_arg];
 		}
 		else if (strcmp(args[cur_arg], "set-cookie") == 0) {
 			if (!*args[cur_arg + 1])
 				goto missing_arg;

 			cur_arg++;
 			cookie = args[cur_arg];
 			cookie_set = 1;
 		}
 		else if (strcmp(args[cur_arg], "clear-cookie") == 0) {
 			if (!*args[cur_arg + 1])
 				goto missing_arg;

 			cur_arg++;
 			cookie = args[cur_arg];
 			cookie_set = 0;
 		}
 		else if (strcmp(args[cur_arg], "code") == 0) {
 			if (!*args[cur_arg + 1])
 				goto missing_arg;

 			cur_arg++;
 			code = atol(args[cur_arg]);
 			if (code < 301 || code > 308 || (code > 303 && code < 307)) {
 				memprintf(errmsg,
 				          "'%s': unsupported HTTP code '%s' (must be one of 301, 302, 303, 307 or 308)",
 				          args[cur_arg - 1], args[cur_arg]);
 				goto err;
 			}
 		}
 		else if (strcmp(args[cur_arg], "drop-query") == 0) {
 			flags |= REDIRECT_FLAG_DROP_QS;
 		}
 		else if (strcmp(args[cur_arg], "append-slash") == 0) {
 			flags |= REDIRECT_FLAG_APPEND_SLASH;
 		}
 		else if (strcmp(args[cur_arg], "if") == 0 ||
 			 strcmp(args[cur_arg], "unless") == 0) {
 			cond = build_acl_cond(file, linenum, &curproxy->acl, curproxy, (const char **)args + cur_arg, errmsg);
 			if (!cond) {
 				memprintf(errmsg, "error in condition: %s", *errmsg);
 				goto err;
 			}
 			break;
 		}
 		else {
 			memprintf(errmsg,
 			          "expects 'code', 'prefix', 'location', 'scheme', 'set-cookie', 'clear-cookie', 'drop-query' or 'append-slash' (was '%s')",
 			          args[cur_arg]);
 			goto err;
 		}
 		cur_arg++;
 	}

 	if (type == REDIRECT_TYPE_NONE) {
 		memprintf(errmsg, "redirection type expected ('prefix', 'location', or 'scheme')");
 		goto err;
 	}

 	if (dir && type != REDIRECT_TYPE_LOCATION) {
 		memprintf(errmsg, "response only supports redirect type 'location'");
 		goto err;
 	}

 	rule = calloc(1, sizeof(*rule));
 	if (!rule)
 		goto out_of_memory;
 	rule->cond = cond;
 	LIST_INIT(&rule->rdr_fmt);

 	if (!use_fmt) {
 		/* old-style static redirect rule */
 		rule->rdr_str = strdup(destination);
 		if (!rule->rdr_str)
 			goto out_of_memory;
 		rule->rdr_len = strlen(destination);
 	}
 	else {
 		/* log-format based redirect rule */
 		int cap = 0;

 		/* Parse destination. Note that in the REDIRECT_TYPE_PREFIX case,
 		 * if prefix == "/", we don't want to add anything, otherwise it
 		 * makes it hard for the user to configure a self-redirection.
 		 */
 		curproxy->conf.args.ctx = ARGC_RDR;
 		if (curproxy->cap & PR_CAP_FE)
 			cap |= (dir ? SMP_VAL_FE_HRS_HDR : SMP_VAL_FE_HRQ_HDR);
 		if (curproxy->cap & PR_CAP_BE)
 			cap |= (dir ? SMP_VAL_BE_HRS_HDR : SMP_VAL_BE_HRQ_HDR);
 		if (!(type == REDIRECT_TYPE_PREFIX && destination[0] == '/' && destination[1] == '\0')) {
 			if (!parse_logformat_string(destination, curproxy, &rule->rdr_fmt, LOG_OPT_HTTP, cap, errmsg)) {
 				goto err;
 			}
 			free(curproxy->conf.lfs_file);
 			curproxy->conf.lfs_file = strdup(curproxy->conf.args.file);
 			curproxy->conf.lfs_line = curproxy->conf.args.line;
 		}
 	}

 	if (cookie) {
 		/* depending on cookie_set, either we want to set the cookie, or to clear it.
 		 * a clear consists in appending "; path=/; Max-Age=0;" at the end.
 		 */
 		rule->cookie_len = strlen(cookie);
 		if (cookie_set) {
 			rule->cookie_str = malloc(rule->cookie_len + 10);
 			if (!rule->cookie_str)
 				goto out_of_memory;
 			memcpy(rule->cookie_str, cookie, rule->cookie_len);
 			memcpy(rule->cookie_str + rule->cookie_len, "; path=/;", 10);
 			rule->cookie_len += 9;
 		} else {
 			rule->cookie_str = malloc(rule->cookie_len + 21);
 			if (!rule->cookie_str)
 				goto out_of_memory;
 			memcpy(rule->cookie_str, cookie, rule->cookie_len);
 			memcpy(rule->cookie_str + rule->cookie_len, "; path=/; Max-Age=0;", 21);
 			rule->cookie_len += 20;
 		}
 	}
 	rule->type = type;
 	rule->code = code;
 	rule->flags = flags;
 	LIST_INIT(&rule->list);
 	return rule;

  missing_arg:
 	memprintf(errmsg, "missing argument for '%s'", args[cur_arg]);
 	goto err;
  out_of_memory:
 	memprintf(errmsg, "parsing [%s:%d]: out of memory.", file, linenum);
  err:
 	if (rule)
 		http_free_redirect_rule(rule);
 	else if (cond) {
 		/* rule not yet allocated, but cond already is */
 		prune_acl_cond(cond);
 		free(cond);
 	}

 	return NULL;
 }

 __attribute__((constructor))
 static void __http_rules_init(void)
 {
 }

 /*
  * Local variables:
  *  c-indent-level: 8
  *  c-basic-offset: 8
  * End:
  */
	/*
	* HTTP rules parsing and registration
	*
	* Copyright 2000-2018 Willy Tarreau <w@1wt.eu>
	*
	* 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/types.h>

	#include <ctype.h>
	#include <string.h>
	#include <time.h>

	#include <haproxy/acl.h>
	#include <haproxy/action.h>
	#include <haproxy/api.h>
	#include <haproxy/arg.h>
	#include <haproxy/capture-t.h>
	#include <haproxy/cfgparse.h>
	#include <haproxy/chunk.h>
	#include <haproxy/global.h>
	#include <haproxy/http.h>
	#include <haproxy/http_rules.h>
	#include <haproxy/log.h>
	#include <haproxy/pool.h>
	#include <haproxy/proxy.h>
	#include <haproxy/sample.h>
	#include <haproxy/tools.h>
	#include <haproxy/version.h>


	/* List head of all known action keywords for "http-request" */
	struct action_kw_list http_req_keywords = {
	.list = LIST_HEAD_INIT(http_req_keywords.list)
	};

	/* List head of all known action keywords for "http-response" */
	struct action_kw_list http_res_keywords = {
	.list = LIST_HEAD_INIT(http_res_keywords.list)
	};

	/* List head of all known action keywords for "http-after-response" */
	struct action_kw_list http_after_res_keywords = {
	.list = LIST_HEAD_INIT(http_after_res_keywords.list)
	};

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

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

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

	/* parse an "http-request" rule */
	struct act_rule parse_http_req_cond(const char args, const char file, int linenum, struct proxy *proxy)
	{
	struct act_rule *rule;
	const struct action_kw *custom = NULL;
	int cur_arg;

	rule = calloc(1, sizeof(*rule));
	if (!rule) {
	ha_alert("parsing [%s:%d]: out of memory.\n", file, linenum);
	goto out_err;
	}
	rule->from = ACT_F_HTTP_REQ;

	if (((custom = action_http_req_custom(args[0])) != NULL)) {
	char *errmsg = NULL;

	cur_arg = 1;
	/* try in the module list */
	rule->kw = custom;

	if (custom->flags & KWF_EXPERIMENTAL) {
	if (!experimental_directives_allowed) {
	ha_alert("parsing [%s:%d] : '%s' action is experimental, must be allowed via a global 'expose-experimental-directives'\n",
	file, linenum, custom->kw);
	goto out_err;
	}
	mark_tainted(TAINTED_CONFIG_EXP_KW_DECLARED);
	}

	if (custom->parse(args, &cur_arg, proxy, rule, &errmsg) == ACT_RET_PRS_ERR) {
	ha_alert("parsing [%s:%d] : error detected in %s '%s' while parsing 'http-request %s' rule : %s.\n",
	file, linenum, proxy_type_str(proxy), proxy->id, args[0], errmsg);
	free(errmsg);
	goto out_err;
	}
	else if (errmsg) {
	ha_warning("parsing [%s:%d] : %s.\n", file, linenum, errmsg);
	free(errmsg);
	}
	}
	else {
	const char *best = action_suggest(args[0], &http_req_keywords.list, NULL);

	action_build_list(&http_req_keywords.list, &trash);
	ha_alert("parsing [%s:%d]: 'http-request' expects %s, but got '%s'%s.%s%s%s\n",
	file, linenum, trash.area,
	args[0], *args[0] ? "" : " (missing argument)",
	best ? " Did you mean '" : "",
	best ? best : "",
	best ? "' maybe ?" : "");
	goto out_err;
	}

	if (strcmp(args[cur_arg], "if") == 0 \|\| strcmp(args[cur_arg], "unless") == 0) {
	struct acl_cond *cond;
	char *errmsg = NULL;

	if ((cond = build_acl_cond(file, linenum, &proxy->acl, proxy, args+cur_arg, &errmsg)) == NULL) {
	ha_alert("parsing [%s:%d] : error detected while parsing an 'http-request %s' condition : %s.\n",
	file, linenum, args[0], errmsg);
	free(errmsg);
	goto out_err;
	}
	rule->cond = cond;
	}
	else if (*args[cur_arg]) {
	ha_alert("parsing [%s:%d]: 'http-request %s' expects"
	" either 'if' or 'unless' followed by a condition but found '%s'.\n",
	file, linenum, args[0], args[cur_arg]);
	goto out_err;
	}

	return rule;
	out_err:
	free(rule);
	return NULL;
	}

	/* parse an "http-respose" rule */
	struct act_rule parse_http_res_cond(const char args, const char file, int linenum, struct proxy *proxy)
	{
	struct act_rule *rule;
	const struct action_kw *custom = NULL;
	int cur_arg;

	rule = calloc(1, sizeof(*rule));
	if (!rule) {
	ha_alert("parsing [%s:%d]: out of memory.\n", file, linenum);
	goto out_err;
	}
	rule->from = ACT_F_HTTP_RES;

	if (((custom = action_http_res_custom(args[0])) != NULL)) {
	char *errmsg = NULL;

	cur_arg = 1;
	/* try in the module list */
	rule->kw = custom;

	if (custom->flags & KWF_EXPERIMENTAL) {
	if (!experimental_directives_allowed) {
	ha_alert("parsing [%s:%d] : '%s' action is experimental, must be allowed via a global 'expose-experimental-directives'\n",
	file, linenum, custom->kw);
	goto out_err;
	}
	mark_tainted(TAINTED_CONFIG_EXP_KW_DECLARED);
	}

	if (custom->parse(args, &cur_arg, proxy, rule, &errmsg) == ACT_RET_PRS_ERR) {
	ha_alert("parsing [%s:%d] : error detected in %s '%s' while parsing 'http-response %s' rule : %s.\n",
	file, linenum, proxy_type_str(proxy), proxy->id, args[0], errmsg);
	free(errmsg);
	goto out_err;
	}
	else if (errmsg) {
	ha_warning("parsing [%s:%d] : %s.\n", file, linenum, errmsg);
	free(errmsg);
	}
	}
	else {
	const char *best = action_suggest(args[0], &http_res_keywords.list, NULL);

	action_build_list(&http_res_keywords.list, &trash);
	ha_alert("parsing [%s:%d]: 'http-response' expects %s, but got '%s'%s.%s%s%s\n",
	file, linenum, trash.area,
	args[0], *args[0] ? "" : " (missing argument)",
	best ? " Did you mean '" : "",
	best ? best : "",
	best ? "' maybe ?" : "");
	goto out_err;
	}

	if (strcmp(args[cur_arg], "if") == 0 \|\| strcmp(args[cur_arg], "unless") == 0) {
	struct acl_cond *cond;
	char *errmsg = NULL;

	if ((cond = build_acl_cond(file, linenum, &proxy->acl, proxy, args+cur_arg, &errmsg)) == NULL) {
	ha_alert("parsing [%s:%d] : error detected while parsing an 'http-response %s' condition : %s.\n",
	file, linenum, args[0], errmsg);
	free(errmsg);
	goto out_err;
	}
	rule->cond = cond;
	}
	else if (*args[cur_arg]) {
	ha_alert("parsing [%s:%d]: 'http-response %s' expects"
	" either 'if' or 'unless' followed by a condition but found '%s'.\n",
	file, linenum, args[0], args[cur_arg]);
	goto out_err;
	}

	return rule;
	out_err:
	free(rule);
	return NULL;
	}


	/* parse an "http-after-response" rule */
	struct act_rule parse_http_after_res_cond(const char args, const char file, int linenum, struct proxy *proxy)
	{
	struct act_rule *rule;
	const struct action_kw *custom = NULL;
	int cur_arg;

	rule = calloc(1, sizeof(*rule));
	if (!rule) {
	ha_alert("parsing [%s:%d]: out of memory.\n", file, linenum);
	goto out_err;
	}
	rule->from = ACT_F_HTTP_RES;

	if (((custom = action_http_after_res_custom(args[0])) != NULL)) {
	char *errmsg = NULL;

	cur_arg = 1;
	/* try in the module list */
	rule->kw = custom;
	if (custom->parse(args, &cur_arg, proxy, rule, &errmsg) == ACT_RET_PRS_ERR) {
	ha_alert("parsing [%s:%d] : error detected in %s '%s' while parsing 'http-after-response %s' rule : %s.\n",
	file, linenum, proxy_type_str(proxy), proxy->id, args[0], errmsg);
	free(errmsg);
	goto out_err;
	}
	else if (errmsg) {
	ha_warning("parsing [%s:%d] : %s.\n", file, linenum, errmsg);
	free(errmsg);
	}
	}
	else {
	const char *best = action_suggest(args[0], &http_after_res_keywords.list, NULL);

	action_build_list(&http_after_res_keywords.list, &trash);
	ha_alert("parsing [%s:%d]: 'http-after-response' expects %s, but got '%s'%s.%s%s%s\n",
	file, linenum, trash.area,
	args[0], *args[0] ? "" : " (missing argument)",
	best ? " Did you mean '" : "",
	best ? best : "",
	best ? "' maybe ?" : "");
	goto out_err;
	}

	if (strcmp(args[cur_arg], "if") == 0 \|\| strcmp(args[cur_arg], "unless") == 0) {
	struct acl_cond *cond;
	char *errmsg = NULL;

	if ((cond = build_acl_cond(file, linenum, &proxy->acl, proxy, args+cur_arg, &errmsg)) == NULL) {
	ha_alert("parsing [%s:%d] : error detected while parsing an 'http-after-response %s' condition : %s.\n",
	file, linenum, args[0], errmsg);
	free(errmsg);
	goto out_err;
	}
	rule->cond = cond;
	}
	else if (*args[cur_arg]) {
	ha_alert("parsing [%s:%d]: 'http-after-response %s' expects"
	" either 'if' or 'unless' followed by a condition but found '%s'.\n",
	file, linenum, args[0], args[cur_arg]);
	goto out_err;
	}

	return rule;
	out_err:
	free(rule);
	return NULL;
	}

	/* completely free redirect rule */
	void http_free_redirect_rule(struct redirect_rule *rdr)
	{
	struct logformat_node lf, lfb;

	if (rdr->cond) {
	prune_acl_cond(rdr->cond);
	free(rdr->cond);
	}
	free(rdr->rdr_str);
	free(rdr->cookie_str);
	list_for_each_entry_safe(lf, lfb, &rdr->rdr_fmt, list) {
	LIST_DELETE(&lf->list);
	release_sample_expr(lf->expr);
	free(lf->arg);
	free(lf);
	}
	free(rdr);
	}

	/* Parses a redirect rule. Returns the redirect rule on success or NULL on error,
	* with <err> filled with the error message. If <use_fmt> is not null, builds a
	* dynamic log-format rule instead of a static string. Parameter <dir> indicates
	* the direction of the rule, and equals 0 for request, non-zero for responses.
	*/
	struct redirect_rule http_parse_redirect_rule(const char file, int linenum, struct proxy *curproxy,
	const char args, char errmsg, int use_fmt, int dir)
	{
	struct redirect_rule *rule = NULL;
	int cur_arg;
	int type = REDIRECT_TYPE_NONE;
	int code = 302;
	const char *destination = NULL;
	const char *cookie = NULL;
	int cookie_set = 0;
	unsigned int flags = (!dir ? REDIRECT_FLAG_FROM_REQ : REDIRECT_FLAG_NONE);
	struct acl_cond *cond = NULL;

	cur_arg = 0;
	while (*(args[cur_arg])) {
	if (strcmp(args[cur_arg], "location") == 0) {
	if (!*args[cur_arg + 1])
	goto missing_arg;

	type = REDIRECT_TYPE_LOCATION;
	cur_arg++;
	destination = args[cur_arg];
	}
	else if (strcmp(args[cur_arg], "prefix") == 0) {
	if (!*args[cur_arg + 1])
	goto missing_arg;
	type = REDIRECT_TYPE_PREFIX;
	cur_arg++;
	destination = args[cur_arg];
	}
	else if (strcmp(args[cur_arg], "scheme") == 0) {
	if (!*args[cur_arg + 1])
	goto missing_arg;

	type = REDIRECT_TYPE_SCHEME;
	cur_arg++;
	destination = args[cur_arg];
	}
	else if (strcmp(args[cur_arg], "set-cookie") == 0) {
	if (!*args[cur_arg + 1])
	goto missing_arg;

	cur_arg++;
	cookie = args[cur_arg];
	cookie_set = 1;
	}
	else if (strcmp(args[cur_arg], "clear-cookie") == 0) {
	if (!*args[cur_arg + 1])
	goto missing_arg;

	cur_arg++;
	cookie = args[cur_arg];
	cookie_set = 0;
	}
	else if (strcmp(args[cur_arg], "code") == 0) {
	if (!*args[cur_arg + 1])
	goto missing_arg;

	cur_arg++;
	code = atol(args[cur_arg]);
	if (code < 301 \|\| code > 308 \|\| (code > 303 && code < 307)) {
	memprintf(errmsg,
	"'%s': unsupported HTTP code '%s' (must be one of 301, 302, 303, 307 or 308)",
	args[cur_arg - 1], args[cur_arg]);
	goto err;
	}
	}
	else if (strcmp(args[cur_arg], "drop-query") == 0) {
	flags \|= REDIRECT_FLAG_DROP_QS;
	}
	else if (strcmp(args[cur_arg], "append-slash") == 0) {
	flags \|= REDIRECT_FLAG_APPEND_SLASH;
	}
	else if (strcmp(args[cur_arg], "if") == 0 \|\|
	strcmp(args[cur_arg], "unless") == 0) {
	cond = build_acl_cond(file, linenum, &curproxy->acl, curproxy, (const char **)args + cur_arg, errmsg);
	if (!cond) {
	memprintf(errmsg, "error in condition: %s", *errmsg);
	goto err;
	}
	break;
	}
	else {
	memprintf(errmsg,
	"expects 'code', 'prefix', 'location', 'scheme', 'set-cookie', 'clear-cookie', 'drop-query' or 'append-slash' (was '%s')",
	args[cur_arg]);
	goto err;
	}
	cur_arg++;
	}

	if (type == REDIRECT_TYPE_NONE) {
	memprintf(errmsg, "redirection type expected ('prefix', 'location', or 'scheme')");
	goto err;
	}

	if (dir && type != REDIRECT_TYPE_LOCATION) {
	memprintf(errmsg, "response only supports redirect type 'location'");
	goto err;
	}

	rule = calloc(1, sizeof(*rule));
	if (!rule)
	goto out_of_memory;
	rule->cond = cond;
	LIST_INIT(&rule->rdr_fmt);

	if (!use_fmt) {
	/* old-style static redirect rule */
	rule->rdr_str = strdup(destination);
	if (!rule->rdr_str)
	goto out_of_memory;
	rule->rdr_len = strlen(destination);
	}
	else {
	/* log-format based redirect rule */
	int cap = 0;

	/* Parse destination. Note that in the REDIRECT_TYPE_PREFIX case,
	* if prefix == "/", we don't want to add anything, otherwise it
	* makes it hard for the user to configure a self-redirection.
	*/
	curproxy->conf.args.ctx = ARGC_RDR;
	if (curproxy->cap & PR_CAP_FE)
	cap \|= (dir ? SMP_VAL_FE_HRS_HDR : SMP_VAL_FE_HRQ_HDR);
	if (curproxy->cap & PR_CAP_BE)
	cap \|= (dir ? SMP_VAL_BE_HRS_HDR : SMP_VAL_BE_HRQ_HDR);
	if (!(type == REDIRECT_TYPE_PREFIX && destination[0] == '/' && destination[1] == '\0')) {
	if (!parse_logformat_string(destination, curproxy, &rule->rdr_fmt, LOG_OPT_HTTP, cap, errmsg)) {
	goto err;
	}
	free(curproxy->conf.lfs_file);
	curproxy->conf.lfs_file = strdup(curproxy->conf.args.file);
	curproxy->conf.lfs_line = curproxy->conf.args.line;
	}
	}

	if (cookie) {
	/* depending on cookie_set, either we want to set the cookie, or to clear it.
	* a clear consists in appending "; path=/; Max-Age=0;" at the end.
	*/
	rule->cookie_len = strlen(cookie);
	if (cookie_set) {
	rule->cookie_str = malloc(rule->cookie_len + 10);
	if (!rule->cookie_str)
	goto out_of_memory;
	memcpy(rule->cookie_str, cookie, rule->cookie_len);
	memcpy(rule->cookie_str + rule->cookie_len, "; path=/;", 10);
	rule->cookie_len += 9;
	} else {
	rule->cookie_str = malloc(rule->cookie_len + 21);
	if (!rule->cookie_str)
	goto out_of_memory;
	memcpy(rule->cookie_str, cookie, rule->cookie_len);
	memcpy(rule->cookie_str + rule->cookie_len, "; path=/; Max-Age=0;", 21);
	rule->cookie_len += 20;
	}
	}
	rule->type = type;
	rule->code = code;
	rule->flags = flags;
	LIST_INIT(&rule->list);
	return rule;

	missing_arg:
	memprintf(errmsg, "missing argument for '%s'", args[cur_arg]);
	goto err;
	out_of_memory:
	memprintf(errmsg, "parsing [%s:%d]: out of memory.", file, linenum);
	err:
	if (rule)
	http_free_redirect_rule(rule);
	else if (cond) {
	/* rule not yet allocated, but cond already is */
	prune_acl_cond(cond);
	free(cond);
	}

	return NULL;
	}

	__attribute__((constructor))
	static void __http_rules_init(void)
	{
	}

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