If a resubscription comes in for a dialog we no longer know about tell the remote...

(closes issue #10727)
Reported by: s0l4rb03
Patches:
      10727-2.diff uploaded by file (license 11)

git-svn-id: https://origsvn.digium.com/svn/asterisk/branches/1.4@104084 65c4cc65-6c06-0410-ace0-fbb531ad65f3

diff --git a/channels/chan_sip.c b/channels/chan_sip.c
index de46b9b447477bb2bb80ff21abdde83605114cf4..eca31b6fc4d3695513235f57dd0a6ec83639a2f4 100644 (file)
--- a/channels/chan_sip.c
+++ b/channels/chan_sip.c
@@ -14812,6 +14812,18 @@ static int handle_request_subscribe(struct sip_pvt *p, struct sip_request *req,
        }
 
        if (!ast_test_flag(req, SIP_PKT_IGNORE) && !resubscribe) {      /* Set up dialog, new subscription */
+               const char *to = get_header(req, "To");
+               char totag[128];
+
+               /* Check to see if a tag was provided, if so this is actually a resubscription of a dialog we no longer know about */
+               if (!ast_strlen_zero(to) && gettag(req, "To", totag, sizeof(totag))) {
+                       if (ast_test_flag(req, SIP_PKT_DEBUG))
+                               ast_verbose("Received resubscription for a dialog we no longer know about. Telling remote side to subscribe again.\n");
+                       transmit_response(p, "481 Subscription does not exist", req);
+                       ast_set_flag(&p->flags[0], SIP_NEEDDESTROY);
+                       return 0;
+               }
+
                /* Use this as the basis */
                if (ast_test_flag(req, SIP_PKT_DEBUG))
                        ast_verbose("Creating new subscription\n");