Fix a SIP request memory leak with TLS connections.

During the TLS re-work in chan_sip some TLS specific code was moved
into a separate function. This function operates on a copy of the
incoming SIP request. This copy was never deinitialized causing a
memory leak for each request processed.

This function is now given a SIP request structure which it can use
to copy the incoming request into. This reduces the amount of memory
allocations done since the internal allocated components are reused
between packets and also ensures the SIP request structure is
deinitialized when the TLS connection is torn down.

(closes issue ASTERISK-20763)
Reported by: deti
........

Merged revisions 377257 from http://svn.asterisk.org/svn/asterisk/branches/1.8


git-svn-id: https://origsvn.digium.com/svn/asterisk/branches/10@377258 65c4cc65-6c06-0410-ace0-fbb531ad65f3

channels/chan_sip.c

@@ -2537,10 +2537,10 @@ static int sip_check_authtimeout(time_t start)
  * \retval -1 Failed to read data
  * \retval 0 Succeeded in reading data
  */
-static int sip_tls_read(struct sip_request *req, struct ast_tcptls_session_instance *tcptls_session, int authenticated, time_t start, struct sip_threadinfo *me)
+static int sip_tls_read(struct sip_request *req, struct sip_request *reqcpy, struct ast_tcptls_session_instance *tcptls_session,
+			int authenticated, time_t start, struct sip_threadinfo *me)
 {
 	int res, content_length, after_poll = 1, need_poll = 1;
-	struct sip_request reqcpy = { 0, };
 	char buf[1024] = "";
 	int timeout = -1;
 
@@ -2594,10 +2594,10 @@ static int sip_tls_read(struct sip_request *req, struct ast_tcptls_session_insta
 		}
 		ast_str_append(&req->data, 0, "%s", buf);
 	}
-	copy_request(&reqcpy, req);
+	copy_request(reqcpy, req);
-	parse_request(&reqcpy);
+	parse_request(reqcpy);
 	/* In order to know how much to read, we need the content-length header */
-	if (sscanf(sip_get_header(&reqcpy, "Content-Length"), "%30d", &content_length)) {
+	if (sscanf(sip_get_header(reqcpy, "Content-Length"), "%30d", &content_length)) {
 		while (content_length > 0) {
 			size_t bytes_read;
 			if (!tcptls_session->client && !authenticated) {
@@ -3011,7 +3011,7 @@ static void *_sip_tcp_helper_thread(struct ast_tcptls_session_instance *tcptls_s
 			req.socket.fd = tcptls_session->fd;
 
 			if (tcptls_session->ssl) {
-				res = sip_tls_read(&req, tcptls_session, authenticated, start, me);
+				res = sip_tls_read(&req, &reqcpy, tcptls_session, authenticated, start, me);
 			} else {
 				res = sip_tcp_read(&req, tcptls_session, authenticated, start);
 			}