From 6169f6e5644dc33d315c20d933976712749d28b1 Mon Sep 17 00:00:00 2001
From: tinusm369 <48559209+tinusm369@users.noreply.github.com>
Date: Tue, 3 May 2022 19:44:42 +0530
Subject: [PATCH 1/2] Process client responses with multipart content

Current situation - the stack is not processing responses(1xx, 2xx) with multipart content and sends BYE request to UAS. The UAC is still connected and waiting for a response from UAS.
Changes - Parse the multipart payload, extract the application/sdp part and replace the payload in response.
---
 libsofia-sip-ua/nua/nua_session.c | 54 +++++++++++++++++++++++++++++++
 1 file changed, 54 insertions(+)

diff --git a/libsofia-sip-ua/nua/nua_session.c b/libsofia-sip-ua/nua/nua_session.c
index 4333701c..e10396e8 100644
--- a/libsofia-sip-ua/nua/nua_session.c
+++ b/libsofia-sip-ua/nua/nua_session.c
@@ -943,6 +943,60 @@ static int nua_session_client_response(nua_client_request_t *cr,
 
  retry:
 
+  sip_t *req = (sip_t *) sip;
+  msg_t *msg = msg = nta_outgoing_getrequest(cr->cr_orq);
+  su_home_t * home_temp = NULL;
+  home_temp = su_home_create();
+  su_home_init(home_temp);
+
+  //For multipart content type, parse it, find application/sdp part and replace payload in response.
+  if (req->sip_content_type && su_casenmatch(req->sip_content_type->c_type, "multipart/", 10)) {
+    msg_multipart_t *mp, *mpp;
+
+    if (req->sip_multipart) {
+      mp = req->sip_multipart;
+    } else {
+     mp = msg_multipart_parse(home_temp, req->sip_content_type, (sip_payload_t *)req->sip_payload);
+     req->sip_multipart = mp;
+    }
+
+    if (mp) {
+      int sdp = 0;
+      /* extract the SDP and set the primary content-type and payload to that SDP as if it was the only content so SOA will work */
+      for (mpp = mp; mpp; mpp = mpp->mp_next) {
+         if (mpp->mp_content_type && mpp->mp_content_type->c_type &&
+                        mpp->mp_payload && mpp->mp_payload->pl_data &&
+                        su_casenmatch(mpp->mp_content_type->c_type, "application/sdp", 15)) {
+            req->sip_content_type = msg_content_type_dup (msg_home(msg), mpp->mp_content_type);
+
+            if (req->sip_content_length) {
+              req->sip_content_length->l_length = mpp->mp_payload->pl_len;
+            }
+
+            req->sip_payload->pl_data = su_strdup (msg_home(msg), mpp->mp_payload->pl_data);
+            req->sip_payload->pl_len = mpp->mp_payload->pl_len;
+
+            sdp++;
+            break;
+          }
+       }
+
+       /* insist on the existance of a SDP in the content */
+       if (!sdp) {
+         if (home_temp) {
+           su_home_destroy (home_temp);
+           su_home_unref (home_temp);
+           home_temp = NULL;
+        }
+      }
+    }
+  }
+  if (home_temp) {
+    su_home_destroy (home_temp);
+    su_home_unref (home_temp);
+    home_temp = NULL;
+  }
+	
   if (!ss || !sip || 300 <= status)
     /* Xyzzy */;
   else if (!session_get_description(sip, &sdp, &len))

From e1678b00849c1cc81be110a17dd68af2b66dba2e Mon Sep 17 00:00:00 2001
From: tinusm369 <48559209+tinusm369@users.noreply.github.com>
Date: Wed, 4 May 2022 11:54:08 +0530
Subject: [PATCH 2/2] Fixed build errors

- declaration of msg_t
- label error
---
 libsofia-sip-ua/nua/nua_session.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/libsofia-sip-ua/nua/nua_session.c b/libsofia-sip-ua/nua/nua_session.c
index e10396e8..cd274d46 100644
--- a/libsofia-sip-ua/nua/nua_session.c
+++ b/libsofia-sip-ua/nua/nua_session.c
@@ -941,10 +941,8 @@ static int nua_session_client_response(nua_client_request_t *cr,
   SU_DEBUG_5(("nua(%p): %s: %s %s in %u %s (%u)\n", \
 			  (void *)nh, cr->cr_method_name, (m), received, status, phrase, cr->cr_answer_recv))
 
- retry:
-
   sip_t *req = (sip_t *) sip;
-  msg_t *msg = msg = nta_outgoing_getrequest(cr->cr_orq);
+  msg_t *msg = nta_outgoing_getrequest(cr->cr_orq);
   su_home_t * home_temp = NULL;
   home_temp = su_home_create();
   su_home_init(home_temp);
@@ -996,6 +994,8 @@ static int nua_session_client_response(nua_client_request_t *cr,
     su_home_unref (home_temp);
     home_temp = NULL;
   }
+
+retry:
 	
   if (!ss || !sip || 300 <= status)
     /* Xyzzy */;