From f285f54311fbc5a94619d414d3486a384d6df7ea Mon Sep 17 00:00:00 2001
From: Willy Tarreau <w@1wt.eu>
Date: Sun, 3 Jan 2010 20:03:03 +0100
Subject: [PATCH] [MINOR] redirect: add support for unconditional rules

Sometimes it's useful to be able to specify an unconditional redirect
rule without adding "if TRUE".
---
 doc/configuration.txt |  6 +++---
 src/cfgparse.c        | 20 ++++++++------------
 src/haproxy.c         |  6 ++++--
 src/proto_http.c      | 11 +++++++----
 4 files changed, 22 insertions(+), 21 deletions(-)

diff --git a/doc/configuration.txt b/doc/configuration.txt
index 7e7cc5dcc..b5d1fda18 100644
--- a/doc/configuration.txt
+++ b/doc/configuration.txt
@@ -3296,14 +3296,14 @@ rate-limit sessions <rate>
   See also : the "backlog" keyword and the "fe_sess_rate" ACL criterion.
 
 
-redirect location <to> [code <code>] <option> {if | unless} <condition>
-redirect prefix   <to> [code <code>] <option> {if | unless} <condition>
+redirect location <to> [code <code>] <option> [{if | unless} <condition>]
+redirect prefix   <to> [code <code>] <option> [{if | unless} <condition>]
   Return an HTTP redirection if/unless a condition is matched
   May be used in sections :   defaults | frontend | listen | backend
                                  no    |    yes   |   yes  |   yes
 
   If/unless the condition is matched, the HTTP request will lead to a redirect
-  response.
+  response. If no condition is specified, the redirect applies unconditionally.
 
   Arguments :
     <to>      With "redirect location", the exact value in <to> is placed into
diff --git a/src/cfgparse.c b/src/cfgparse.c
index 938caf168..cd7ecd1a9 100644
--- a/src/cfgparse.c
+++ b/src/cfgparse.c
@@ -1754,7 +1754,7 @@ int cfg_parse_listen(const char *file, int linenum, char **args, int kwm)
 	}
 	else if (!strcmp(args[0], "redirect")) {
 		int pol = ACL_COND_NONE;
-		struct acl_cond *cond;
+		struct acl_cond *cond = NULL;
 		struct redirect_rule *rule;
 		int cur_arg;
 		int type = REDIRECT_TYPE_NONE;
@@ -1859,23 +1859,19 @@ int cfg_parse_listen(const char *file, int linenum, char **args, int kwm)
 			goto out;
 		}
 
-		if (pol == ACL_COND_NONE) {
-			Alert("parsing [%s:%d] : '%s' requires either 'if' or 'unless' followed by a condition.\n",
-			      file, linenum, args[0]);
-			err_code |= ERR_ALERT | ERR_FATAL;
-			goto out;
-		}
-
-		if ((cond = parse_acl_cond((const char **)args + cur_arg, &curproxy->acl, pol)) == NULL) {
+		if (pol != ACL_COND_NONE &&
+		    (cond = parse_acl_cond((const char **)args + cur_arg, &curproxy->acl, pol)) == NULL) {
 			Alert("parsing [%s:%d] : '%s': error detected while parsing redirect condition.\n",
 			      file, linenum, args[0]);
 			err_code |= ERR_ALERT | ERR_FATAL;
 			goto out;
 		}
 
-		cond->file = file;
-		cond->line = linenum;
-		curproxy->acl_requires |= cond->requires;
+		if (cond) {
+			cond->file = file;
+			cond->line = linenum;
+			curproxy->acl_requires |= cond->requires;
+		}
 		rule = (struct redirect_rule *)calloc(1, sizeof(*rule));
 		rule->cond = cond;
 		rule->rdr_str = strdup(destination);
diff --git a/src/haproxy.c b/src/haproxy.c
index 71537d02f..48f23d67c 100644
--- a/src/haproxy.c
+++ b/src/haproxy.c
@@ -797,8 +797,10 @@ void deinit(void)
 
 		list_for_each_entry_safe(rdr, rdrb, &p->redirect_rules, list) {
 			LIST_DEL(&rdr->list);
-			prune_acl_cond(rdr->cond);
-			free(rdr->cond);
+			if (rdr->cond) {
+				prune_acl_cond(rdr->cond);
+				free(rdr->cond);
+			}
 			free(rdr->rdr_str);
 			free(rdr);
 		}
diff --git a/src/proto_http.c b/src/proto_http.c
index f0e878526..5d7000019 100644
--- a/src/proto_http.c
+++ b/src/proto_http.c
@@ -2697,11 +2697,14 @@ int http_process_req_common(struct session *s, struct buffer *req, int an_bit, s
 
 	/* check whether we have some ACLs set to redirect this request */
 	list_for_each_entry(rule, &px->redirect_rules, list) {
-		int ret = acl_exec_cond(rule->cond, px, s, txn, ACL_DIR_REQ);
+		int ret = ACL_PAT_PASS;
 
-		ret = acl_pass(ret);
-		if (rule->cond->pol == ACL_COND_UNLESS)
-			ret = !ret;
+		if (rule->cond) {
+			ret = acl_exec_cond(rule->cond, px, s, txn, ACL_DIR_REQ);
+			ret = acl_pass(ret);
+			if (rule->cond->pol == ACL_COND_UNLESS)
+				ret = !ret;
+		}
 
 		if (ret) {
 			struct chunk rdr = { .str = trash, .size = sizeof(trash), .len = 0 };