[Asterisk-code-review] res_pjsip_nat: Don't rewrite Contact on REGISTER responses. (asterisk[16])

[Joshua Colp]

Joshua Colp has submitted this change. ( https://gerrit.asterisk.org/c/asterisk/+/15495 )

Change subject: res_pjsip_nat: Don't rewrite Contact on REGISTER responses.
......................................................................

res_pjsip_nat: Don't rewrite Contact on REGISTER responses.

When sending a SIP response to an incoming REGISTER request
we don't want to change the Contact header as it will
contain the Contacts registered to the AOR and not our own
Contact URI.

ASTERISK-29235

Change-Id: I35a0723545281dd01fcd5cae497baab58720478c
---
M res/res_pjsip_nat.c
1 file changed, 18 insertions(+), 6 deletions(-)

Approvals:
  Kevin Harwell: Looks good to me, approved
  Benjamin Keith Ford: Looks good to me, but someone else must approve
  George Joseph: Looks good to me, but someone else must approve
  Joshua Colp: Approved for Submit



diff --git a/res/res_pjsip_nat.c b/res/res_pjsip_nat.c
index 3d6f25d..1b5fdd1 100644
--- a/res/res_pjsip_nat.c
+++ b/res/res_pjsip_nat.c
@@ -432,12 +432,24 @@
 	}
 
 	if (!ast_sockaddr_isnull(&transport_state->external_signaling_address)) {
-		/* Update the contact header with the external address */
-		if (uri || (uri = nat_get_contact_sip_uri(tdata))) {
-			pj_strdup2(tdata->pool, &uri->host, ast_sockaddr_stringify_host(&transport_state->external_signaling_address));
-			if (transport->external_signaling_port) {
-				uri->port = transport->external_signaling_port;
-				ast_debug(4, "Re-wrote Contact URI port to %d\n", uri->port);
+		pjsip_cseq_hdr *cseq = PJSIP_MSG_CSEQ_HDR(tdata->msg);
+
+		/* Update the Contact header with the external address. We only do this if
+		 * a CSeq is not present (which should not happen - but we are extra safe),
+		 * if a request is being sent, or if a response is sent that is not a response
+		 * to a REGISTER. We specifically don't do this for a response to a REGISTER
+		 * as the Contact headers would contain the registered Contacts, and not our
+		 * own Contact.
+		 */
+		if (!cseq || tdata->msg->type == PJSIP_REQUEST_MSG ||
+			pjsip_method_cmp(&cseq->method, &pjsip_register_method)) {
+			/* We can only rewrite the URI when one is present */
+			if (uri || (uri = nat_get_contact_sip_uri(tdata))) {
+				pj_strdup2(tdata->pool, &uri->host, ast_sockaddr_stringify_host(&transport_state->external_signaling_address));
+				if (transport->external_signaling_port) {
+					uri->port = transport->external_signaling_port;
+					ast_debug(4, "Re-wrote Contact URI port to %d\n", uri->port);
+				}
 			}
 		}
 

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Gerrit-Project: asterisk
Gerrit-Branch: 16
Gerrit-Change-Id: I35a0723545281dd01fcd5cae497baab58720478c
Gerrit-Change-Number: 15495
Gerrit-PatchSet: 4
Gerrit-Owner: Joshua Colp <jcolp at sangoma.com>
Gerrit-Reviewer: Benjamin Keith Ford <bford at digium.com>
Gerrit-Reviewer: Friendly Automation
Gerrit-Reviewer: George Joseph <gjoseph at digium.com>
Gerrit-Reviewer: Joshua Colp <jcolp at sangoma.com>
Gerrit-Reviewer: Kevin Harwell <kharwell at digium.com>
Gerrit-MessageType: merged
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