res_pjsip_transport_websocket: Fix a progressive memory growth.

The packet structure used to receive messages was using the transport
pool. This meant that for each parsing the pool would grow accordingly.
Since memory can not be reclaimed without resetting it this would
cause the memory pool to grow and grow.

This change uses a specific memory pool for the packet structure and
resets it to a fresh state after the message has been received and
handled.
........

Merged revisions 421939 from http://svn.asterisk.org/svn/asterisk/branches/12


git-svn-id: https://origsvn.digium.com/svn/asterisk/branches/13@421945 65c4cc65-6c06-0410-ace0-fbb531ad65f3

res/res_pjsip_transport_websocket.c

@@ -90,6 +90,10 @@ static pj_status_t ws_destroy(pjsip_transport *transport)
 
 	pjsip_endpt_release_pool(wstransport->transport.endpt, wstransport->transport.pool);
 
+	if (wstransport->rdata.tp_info.pool) {
+		pjsip_endpt_release_pool(wstransport->transport.endpt, wstransport->rdata.tp_info.pool);
+	}
+
 	return PJ_SUCCESS;
 }
 
@@ -162,6 +166,15 @@ static int transport_create(void *data)
 
 	pjsip_transport_register(newtransport->transport.tpmgr, (pjsip_transport *)newtransport);
 
+	newtransport->rdata.tp_info.transport = &newtransport->transport;
+	newtransport->rdata.tp_info.pool = pjsip_endpt_create_pool(endpt, "rtd%p",
+		PJSIP_POOL_RDATA_LEN, PJSIP_POOL_RDATA_INC);
+	if (!newtransport->rdata.tp_info.pool) {
+		ast_log(LOG_ERROR, "Failed to allocate WebSocket rdata.\n");
+		pjsip_endpt_release_pool(endpt, pool);
+		return -1;
+	}
+
 	create_data->transport = newtransport;
 	return 0;
 }
@@ -185,9 +198,6 @@ static int transport_read(void *data)
 	int recvd;
 	pj_str_t buf;
 
-	rdata->tp_info.pool = newtransport->transport.pool;
-	rdata->tp_info.transport = &newtransport->transport;
-
 	pj_gettimeofday(&rdata->pkt_info.timestamp);
 
 	pj_memcpy(rdata->pkt_info.packet, read_data->payload, sizeof(rdata->pkt_info.packet));
@@ -204,6 +214,8 @@ static int transport_read(void *data)
 
 	recvd = pjsip_tpmgr_receive_packet(rdata->tp_info.transport->tpmgr, rdata);
 
+	pj_pool_reset(rdata->tp_info.pool);
+
 	return (read_data->payload_len == recvd) ? 0 : -1;
 }