From: Alexei Gradinari <alex2grad@gmail.com>
Date: Tue, 15 Mar 2022 17:24:18 +0000 (-0400)
Subject: res_pjsip_pubsub: RLS 'uri' list attribute mismatch with SUBSCRIBE request
X-Git-Tag: 16.26.0-rc1~49
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=7a4a83ab27ac7f9028730c4b159e0964af88f276;p=thirdparty%2Fasterisk.git

res_pjsip_pubsub: RLS 'uri' list attribute mismatch with SUBSCRIBE request

When asterisk generates the RLMI part of NOTIFY request,
the asterisk uses the local contact uri instead of the URI to which
the SUBSCRIBE request is sent.
Because of this mismatch some IP phones (for example Cisco 5XX) ignore
this list.

According
https://datatracker.ietf.org/doc/html/rfc4662#section-5.2
  The first mandatory <list> attribute is "uri", which contains the uri
  that corresponds to the list. Typically, this is the URI to which
  the SUBSCRIBE request was sent.
https://datatracker.ietf.org/doc/html/rfc4662#section-5.3
  The "uri" attribute identifies the resource to which the <resource>
  element corresponds. Typically, this will be a SIP URI that, if
  subscribed to, would return the state of the resource.

This patch makes asterisk to generate URI using SUBSCRIBE request URI.

ASTERISK-29961 #close

Change-Id: I1fcfc08fd589677f40608c59a4e143c45ee05f6c
---

diff --git a/res/res_pjsip_pubsub.c b/res/res_pjsip_pubsub.c
index 21174aeaa4..1d136955bf 100644
--- a/res/res_pjsip_pubsub.c
+++ b/res/res_pjsip_pubsub.c
@@ -1257,7 +1257,14 @@ static struct ast_sip_subscription *allocate_subscription(const struct ast_sip_s
 		const char *resource, const char *display_name, struct sip_subscription_tree *tree)
 {
 	struct ast_sip_subscription *sub;
-	pjsip_sip_uri *contact_uri;
+	pjsip_msg *msg;
+	pjsip_sip_uri *request_uri;
+
+	msg = ast_sip_mod_data_get(tree->dlg->mod_data, pubsub_module.id, MOD_DATA_MSG);
+	if (!msg) {
+		ast_log(LOG_ERROR, "No dialog message saved for SIP subscription. Cannot allocate subscription for resource %s\n", resource);
+		return NULL;
+	}
 
 	sub = ast_calloc(1, sizeof(*sub) + strlen(resource) + 1);
 	if (!sub) {
@@ -1280,8 +1287,8 @@ static struct ast_sip_subscription *allocate_subscription(const struct ast_sip_s
 	}
 
 	sub->uri = pjsip_sip_uri_create(tree->dlg->pool, PJ_FALSE);
-	contact_uri = pjsip_uri_get_uri(tree->dlg->local.contact->uri);
-	pjsip_sip_uri_assign(tree->dlg->pool, sub->uri, contact_uri);
+	request_uri = pjsip_uri_get_uri(msg->line.req.uri);
+	pjsip_sip_uri_assign(tree->dlg->pool, sub->uri, request_uri);
 	pj_strdup2(tree->dlg->pool, &sub->uri->user, resource);
 
 	/* If there is any persistence information available for this subscription that was persisted