From: William Lallemand <wlallemand@haproxy.com>
Date: Mon, 23 Oct 2017 12:36:34 +0000 (+0200)
Subject: MEDIUM: cfgparse: post parsing registration
X-Git-Tag: v1.8-rc1~220
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=48b4bb4b09a51a8ef8c0d3692550831bd0c67d95;p=thirdparty%2Fhaproxy.git

MEDIUM: cfgparse: post parsing registration

Allow to register a function which will be called after the
configuration file parsing, at the end of the check_config_validity().

It's useful fo checking dependencies between sections or for resolving
keywords, pointers or values.
---

diff --git a/include/common/cfgparse.h b/include/common/cfgparse.h
index fc96bfea04..230c35fa86 100644
--- a/include/common/cfgparse.h
+++ b/include/common/cfgparse.h
@@ -75,6 +75,7 @@ int str2listener(char *str, struct proxy *curproxy, struct bind_conf *bind_conf,
 int cfg_register_section(char *section_name,
                          int (*section_parser)(const char *, int, char **, int),
                          int (*post_section_parser)());
+int cfg_register_postparser(char *name, int (*func)());
 void cfg_unregister_sections(void);
 void cfg_backup_sections(struct list *backup_sections);
 void cfg_restore_sections(struct list *backup_sections);
diff --git a/src/cfgparse.c b/src/cfgparse.c
index 8a5c8f003b..ed74960a3f 100644
--- a/src/cfgparse.c
+++ b/src/cfgparse.c
@@ -134,6 +134,16 @@ struct cfg_section {
  */
 struct list sections = LIST_HEAD_INIT(sections);
 
+/* store post configuration parsing */
+
+struct cfg_postparser {
+	struct list list;
+	char *name;
+	int (*func)();
+};
+
+struct list postparsers = LIST_HEAD_INIT(postparsers);
+
 /* some of the most common options which are also the easiest to handle */
 struct cfg_opt {
 	const char *name;
@@ -7384,6 +7394,7 @@ int check_config_validity()
 	struct bind_conf *bind_conf;
 	char *err;
 	struct dns_resolvers *curr_resolvers;
+	struct cfg_postparser *postparser;
 
 	bind_conf = NULL;
 	/*
@@ -9235,6 +9246,11 @@ out_uri_auth_compat:
 				    global.tune.max_http_hdr * sizeof(struct hdr_idx_elem),
 				    MEM_F_SHARED);
 
+	list_for_each_entry(postparser, &postparsers, list) {
+		if (postparser->func)
+			cfgerr += postparser->func();
+	}
+
 	if (cfgerr > 0)
 		err_code |= ERR_ALERT | ERR_FATAL;
  out:
@@ -9292,6 +9308,27 @@ int cfg_register_section(char *section_name,
 	return 1;
 }
 
+/* this function register a new function which will be called once the haproxy
+ * configuration file has been parsed. It's useful to check dependencies
+ * between sections or to resolve items once everything is parsed.
+ */
+int cfg_register_postparser(char *name, int (*func)())
+{
+	struct cfg_postparser *cp;
+
+	cp = calloc(1, sizeof(*cp));
+	if (!cp) {
+		Alert("register postparser '%s': out of memory.\n", name);
+		return 0;
+	}
+	cp->name = name;
+	cp->func = func;
+
+	LIST_ADDQ(&postparsers, &cp->list);
+
+	return 1;
+}
+
 /*
  * free all config section entries
  */