From 10cd4d8a93905f6fa1c3a20e2610c1438dca1571 Mon Sep 17 00:00:00 2001
From: russell <russell@f38db490-d61c-443f-a65b-d21fe96a405b>
Date: Sat, 23 Dec 2006 20:22:52 +0000
Subject: Implement locking for the list of URI handlers to make it
 thread-safe.

git-svn-id: http://svn.digium.com/svn/asterisk/branches/1.4@48931 f38db490-d61c-443f-a65b-d21fe96a405b
---
 main/http.c | 26 ++++++++++++++++++++++----
 1 file changed, 22 insertions(+), 4 deletions(-)

(limited to 'main/http.c')

diff --git a/main/http.c b/main/http.c
index b778017ec..78b1a960b 100644
--- a/main/http.c
+++ b/main/http.c
@@ -64,7 +64,8 @@ struct ast_http_server_instance {
 	ast_http_callback callback;
 };
 
-static struct ast_http_uri *uris;
+AST_MUTEX_DEFINE_STATIC(uris_lock);
+static struct ast_http_uri *uris = NULL;
 
 static int httpfd = -1;
 static pthread_t master = AST_PTHREADT_NULL;
@@ -241,7 +242,10 @@ char *ast_http_error(int status, const char *title, const char *extra_header, co
 
 int ast_http_uri_link(struct ast_http_uri *urih)
 {
-	struct ast_http_uri *prev=uris;
+	struct ast_http_uri *prev;
+
+	ast_mutex_lock(&uris_lock);
+	prev = uris;
 	if (!uris || strlen(uris->uri) <= strlen(urih->uri)) {
 		urih->next = uris;
 		uris = urih;
@@ -252,14 +256,21 @@ int ast_http_uri_link(struct ast_http_uri *urih)
 		urih->next = prev->next;
 		prev->next = urih;
 	}
+	ast_mutex_unlock(&uris_lock);
+
 	return 0;
 }	
 
 void ast_http_uri_unlink(struct ast_http_uri *urih)
 {
-	struct ast_http_uri *prev = uris;
-	if (!uris)
+	struct ast_http_uri *prev;
+
+	ast_mutex_lock(&uris_lock);
+	if (!uris) {
+		ast_mutex_unlock(&uris_lock);
 		return;
+	}
+	prev = uris;
 	if (uris == urih) {
 		uris = uris->next;
 	}
@@ -270,6 +281,7 @@ void ast_http_uri_unlink(struct ast_http_uri *urih)
 		}
 		prev = prev->next;
 	}
+	ast_mutex_unlock(&uris_lock);
 }
 
 static char *handle_uri(struct sockaddr_in *sin, char *uri, int *status, char **title, int *contentlength, struct ast_variable **cookies)
@@ -317,6 +329,7 @@ static char *handle_uri(struct sockaddr_in *sin, char *uri, int *status, char **
 		if (!*uri || (*uri == '/')) {
 			if (*uri == '/')
 				uri++;
+			ast_mutex_lock(&uris_lock);
 			urih = uris;
 			while(urih) {
 				len = strlen(urih->uri);
@@ -333,10 +346,13 @@ static char *handle_uri(struct sockaddr_in *sin, char *uri, int *status, char **
 				}
 				urih = urih->next;
 			}
+			if (!urih)
+				ast_mutex_unlock(&uris_lock);
 		}
 	}
 	if (urih) {
 		c = urih->callback(sin, uri, vars, status, title, contentlength);
+		ast_mutex_unlock(&uris_lock);
 	} else if (ast_strlen_zero(uri) && ast_strlen_zero(prefix)) {
 		/* Special case: If no prefix, and no URI, send to /static/index.html */
 		c = ast_http_error(302, "Moved Temporarily", "Location: /static/index.html\r\n", "This is not the page you are looking for...");
@@ -672,6 +688,7 @@ static int handle_show_http(int fd, int argc, char *argv[])
 	else
 		ast_cli(fd, "Server Disabled\n\n");
 	ast_cli(fd, "Enabled URI's:\n");
+	ast_mutex_lock(&uris_lock);
 	urih = uris;
 	while(urih){
 		ast_cli(fd, "%s/%s%s => %s\n", prefix, urih->uri, (urih->has_subtree ? "/..." : "" ), urih->description);
@@ -679,6 +696,7 @@ static int handle_show_http(int fd, int argc, char *argv[])
 	}
 	if (!uris)
 		ast_cli(fd, "None.\n");
+	ast_mutex_unlock(&uris_lock);
 	return RESULT_SUCCESS;
 }
 
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