From 8b3c808c37dd5672f87e7b61085295e1316a6694 Mon Sep 17 00:00:00 2001
From: Willy Tarreau <w@1wt.eu>
Date: Tue, 16 Sep 2014 15:39:51 +0200
Subject: [PATCH 12/13] MEDIUM: config: report it when tcp-request rules are
 misplaced

A config where a tcp-request rule appears after an http-request rule
might seem valid but it is not. So let's report a warning about this
since this case is hard to detect by the naked eye.
(cherry picked from commit 3986b9c14037f446f5f5bec6207a39e1bd753fae)
---
 include/common/cfgparse.h |  2 ++
 src/cfgparse.c            | 38 ++++++++++++++++++++++++++++++++++++++
 src/proto_tcp.c           |  4 ++++
 3 files changed, 44 insertions(+)

diff --git a/include/common/cfgparse.h b/include/common/cfgparse.h
index 80310ae..86a0035 100644
--- a/include/common/cfgparse.h
+++ b/include/common/cfgparse.h
@@ -73,6 +73,8 @@ int check_config_validity();
 int str2listener(char *str, struct proxy *curproxy, struct bind_conf *bind_conf, const char *file, int line, char **err);
 int cfg_register_section(char *section_name,
                          int (*section_parser)(const char *, int, char **, int));
+int warnif_misplaced_tcp_conn(struct proxy *proxy, const char *file, int line, const char *arg);
+int warnif_misplaced_tcp_cont(struct proxy *proxy, const char *file, int line, const char *arg);
 
 /*
  * Sends a warning if proxy <proxy> does not have at least one of the
diff --git a/src/cfgparse.c b/src/cfgparse.c
index 5668393..9ff44e9 100644
--- a/src/cfgparse.c
+++ b/src/cfgparse.c
@@ -317,6 +317,19 @@ int str2listener(char *str, struct proxy *curproxy, struct bind_conf *bind_conf,
 	return 0;
 }
 
+/* Report a warning if a rule is placed after a 'tcp-request content' rule.
+ * Return 1 if the warning has been emitted, otherwise 0.
+ */
+int warnif_rule_after_tcp_cont(struct proxy *proxy, const char *file, int line, const char *arg)
+{
+	if (!LIST_ISEMPTY(&proxy->tcp_req.inspect_rules)) {
+		Warning("parsing [%s:%d] : a '%s' rule placed after a 'tcp-request content' rule will still be processed before.\n",
+			file, line, arg);
+		return 1;
+	}
+	return 0;
+}
+
 /* Report a warning if a rule is placed after a 'block' rule.
  * Return 1 if the warning has been emitted, otherwise 0.
  */
@@ -408,6 +421,31 @@ int warnif_rule_after_use_server(struct proxy *proxy, const char *file, int line
 	return 0;
 }
 
+/* report a warning if a "tcp request connection" rule is dangerously placed */
+int warnif_misplaced_tcp_conn(struct proxy *proxy, const char *file, int line, const char *arg)
+{
+	return	warnif_rule_after_tcp_cont(proxy, file, line, arg) ||
+		warnif_rule_after_block(proxy, file, line, arg) ||
+		warnif_rule_after_http_req(proxy, file, line, arg) ||
+		warnif_rule_after_reqxxx(proxy, file, line, arg) ||
+		warnif_rule_after_reqadd(proxy, file, line, arg) ||
+		warnif_rule_after_redirect(proxy, file, line, arg) ||
+		warnif_rule_after_use_backend(proxy, file, line, arg) ||
+		warnif_rule_after_use_server(proxy, file, line, arg);
+}
+
+/* report a warning if a "tcp request content" rule is dangerously placed */
+int warnif_misplaced_tcp_cont(struct proxy *proxy, const char *file, int line, const char *arg)
+{
+	return	warnif_rule_after_block(proxy, file, line, arg) ||
+		warnif_rule_after_http_req(proxy, file, line, arg) ||
+		warnif_rule_after_reqxxx(proxy, file, line, arg) ||
+		warnif_rule_after_reqadd(proxy, file, line, arg) ||
+		warnif_rule_after_redirect(proxy, file, line, arg) ||
+		warnif_rule_after_use_backend(proxy, file, line, arg) ||
+		warnif_rule_after_use_server(proxy, file, line, arg);
+}
+
 /* report a warning if a block rule is dangerously placed */
 int warnif_misplaced_block(struct proxy *proxy, const char *file, int line, const char *arg)
 {
diff --git a/src/proto_tcp.c b/src/proto_tcp.c
index 72dc92b..940c3f1 100644
--- a/src/proto_tcp.c
+++ b/src/proto_tcp.c
@@ -1711,6 +1711,8 @@ static int tcp_parse_tcp_req(char **args, int section_type, struct proxy *curpx,
 			warn++;
 		}
 
+		/* the following function directly emits the warning */
+		warnif_misplaced_tcp_cont(curpx, file, line, args[0]);
 		LIST_ADDQ(&curpx->tcp_req.inspect_rules, &rule->list);
 	}
 	else if (strcmp(args[1], "connection") == 0) {
@@ -1754,6 +1756,8 @@ static int tcp_parse_tcp_req(char **args, int section_type, struct proxy *curpx,
 			warn++;
 		}
 
+		/* the following function directly emits the warning */
+		warnif_misplaced_tcp_conn(curpx, file, line, args[0]);
 		LIST_ADDQ(&curpx->tcp_req.l4_rules, &rule->list);
 	}
 	else {
-- 
1.8.5.5