Changeset 3172 for pjproject/trunk/pjsip/src/pjsua-lib/pjsua_media.c

Timestamp:

May 13, 2010 5:22:51 AM (13 years ago)

Author:

nanang

Message:

Re #1069:

• Added new approach of SRTP optional mode in pjsua-lib by duplicating SDP media line for secured and unsecured version of media transport.
• Integrated this feature into pjsua app, it is activated via --use-srtp=3 param.

File:

• pjproject/trunk/pjsip/src/pjsua-lib/pjsua_media.c (modified) (1 diff)

pjproject/trunk/pjsip/src/pjsua-lib/pjsua_media.c

@@ -1369 +1369 @@
         return status;
     }
+
+#if defined(PJMEDIA_HAS_SRTP) && (PJMEDIA_HAS_SRTP != 0)
+    /* Check if SRTP is in optional mode and configured to use duplicated
+     * media, i.e: secured and unsecured version, in the SDP offer.
+     */
+    if (!rem_sdp &&
+        pjsua_var.acc[call->acc_id].cfg.use_srtp == PJMEDIA_SRTP_OPTIONAL &&
+        pjsua_var.acc[call->acc_id].cfg.srtp_optional_dup_offer)
+    {
+        unsigned i;
+
+        for (i = 0; i < sdp->media_count; ++i) {
+            pjmedia_sdp_media *m = sdp->media[i];
+
+            /* Check if this media is unsecured but has SDP "crypto" 
+             * attribute.
+             */
+            if (pj_stricmp2(&m->desc.transport, "RTP/AVP") == 0 &&
+                pjmedia_sdp_media_find_attr2(m, "crypto", NULL) != NULL)
+            {
+                pjmedia_sdp_media *new_m;
+
+                /* Duplicate this media and apply secured transport */
+                new_m = pjmedia_sdp_media_clone(pool, m);
+                pj_strdup2(pool, &new_m->desc.transport, "RTP/SAVP");
+
+                /* Remove the "crypto" attribute in the unsecured media */
+                pjmedia_sdp_media_remove_all_attr(m, "crypto");
+
+                /* Insert the new media before the unsecured media */
+                if (sdp->media_count < PJMEDIA_MAX_SDP_MEDIA) {
+                    pj_array_insert(sdp->media, sizeof(new_m), 
+                                    sdp->media_count, i, &new_m);
+                    ++sdp->media_count;
+                    ++i;
+                }
+            }
+        }
+    }
+#endif
 
     /* Update currently advertised RTP source address */