res_pjsip: Ensure in-dialog responses have an endpoint associated.

When handling incoming messages we determine if it is associated with
a dialog. If so we use that to determine what serializer and endpoint
to use for the message. Previously this would pass the endpoint to the
endpoint lookup module to actually place the endpoint completely on the
message. For in-dialog responses, however, this did not occur as
dialog processing took over and the endpoint lookup did not occur.

This change just places the endpoint in the expected spot immediately
instead of relying on the endpoint lookup module. In-dialog responses
thus have the expected endpoint.

AST-1459 #close

Review: https://reviewboard.asterisk.org/r/4146/
........

Merged revisions 427490 from http://svn.asterisk.org/svn/asterisk/branches/12
........

Merged revisions 427491 from http://svn.asterisk.org/svn/asterisk/branches/13


git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@427492 65c4cc65-6c06-0410-ace0-fbb531ad65f3

res/res_pjsip/pjsip_distributor.c

@@ -153,6 +153,14 @@ static pjsip_dialog *find_dialog(pjsip_rx_data *rdata)
 	return dlg;
 }
 
+static pj_bool_t endpoint_lookup(pjsip_rx_data *rdata);
+
+static pjsip_module endpoint_mod = {
+	.name = {"Endpoint Identifier", 19},
+	.priority = PJSIP_MOD_PRIORITY_TSX_LAYER - 3,
+	.on_rx_request = endpoint_lookup,
+};
+
 static pj_bool_t distributor(pjsip_rx_data *rdata)
 {
 	pjsip_dialog *dlg = find_dialog(rdata);
@@ -178,7 +186,7 @@ static pj_bool_t distributor(pjsip_rx_data *rdata)
 	pjsip_rx_data_clone(rdata, 0, &clone);
 
 	if (dist) {
-		clone->endpt_info.mod_data[distributor_mod.id] = dist->endpoint;
+		clone->endpt_info.mod_data[endpoint_mod.id] = ao2_bump(dist->endpoint);
 	}
 
 	ast_sip_push_task(serializer, distribute, clone);
@@ -191,14 +199,6 @@ end:
 	return PJ_TRUE;
 }
 
-static pj_bool_t endpoint_lookup(pjsip_rx_data *rdata);
-
-static pjsip_module endpoint_mod = {
-	.name = {"Endpoint Identifier", 19},
-	.priority = PJSIP_MOD_PRIORITY_TSX_LAYER - 3,
-	.on_rx_request = endpoint_lookup,
-};
-
 static struct ast_sip_auth *artificial_auth;
 
 static int create_artificial_auth(void)
@@ -261,15 +261,13 @@ static pj_bool_t endpoint_lookup(pjsip_rx_data *rdata)
 	struct ast_sip_endpoint *endpoint;
 	int is_ack = rdata->msg_info.msg->line.req.method.id == PJSIP_ACK_METHOD;
 
-	endpoint = rdata->endpt_info.mod_data[distributor_mod.id];
+	endpoint = rdata->endpt_info.mod_data[endpoint_mod.id];
 	if (endpoint) {
-		/* Bumping the refcount makes refcounting consistent whether an endpoint
+		return PJ_FALSE;
-		 * is looked up or not */
-		ao2_ref(endpoint, +1);
-	} else {
-		endpoint = ast_sip_identify_endpoint(rdata);
 	}
 
+	endpoint = ast_sip_identify_endpoint(rdata);
+
 	if (!endpoint && !is_ack) {
 		char name[AST_UUID_STR_LEN] = "";
 		pjsip_uri *from = rdata->msg_info.from->uri;