Fix ability to perform a remote attended transfer with PJSIP.

This fix has two parts:

* Corrected an error message to properly state that external_replaces is an extension. The
  error message also prints what dialplan context the external_replaces extension was being
  looked for in.
* Corrected the printing of the Replaces: header in an INVITE request. We were duplicating
  "Replaces: " in the header.

ASTERISK-24376 #close
Reported by Matt Jordan

Review: https://reviewboard.asterisk.org/r/4296
........

Merged revisions 430313 from http://svn.asterisk.org/svn/asterisk/branches/13

git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@430314 65c4cc65-6c06-0410-ace0-fbb531ad65f3

diff --git a/res/res_pjsip_refer.c b/res/res_pjsip_refer.c
index 1cbbbc0..87700ac 100644 (file)
--- a/res/res_pjsip_refer.c
+++ b/res/res_pjsip_refer.c
@@ -599,9 +599,16 @@ static void refer_blind_callback(struct ast_channel *chan, struct transfer_chann
 
        if (refer->replaces) {
                char replaces[512];
-
-               pjsip_hdr_print_on(refer->replaces, replaces, sizeof(replaces));
-               pbx_builtin_setvar_helper(chan, "__SIPREPLACESHDR", S_OR(replaces, NULL));
+               char *replaces_val = NULL;
+               int len;
+
+               len = pjsip_hdr_print_on(refer->replaces, replaces, sizeof(replaces) - 1);
+               if (len != -1) {
+                       /* pjsip_hdr_print_on does not NULL terminate the buffer */
+                       replaces[len] = '\0';
+                       replaces_val = replaces + sizeof("Replaces:");
+               }
+               pbx_builtin_setvar_helper(chan, "__SIPREPLACESHDR", replaces_val);
        } else {
                pbx_builtin_setvar_helper(chan, "SIPREPLACESHDR", NULL);
        }
@@ -674,8 +681,8 @@ static int refer_incoming_attended_request(struct ast_sip_session *session, pjsi
                }
 
                if (!ast_exists_extension(NULL, context, "external_replaces", 1, NULL)) {
-                       ast_log(LOG_ERROR, "Received REFER for remote session on channel '%s' from endpoint '%s' but 'external_replaces' context does not exist for handling\n",
-                               ast_channel_name(session->channel), ast_sorcery_object_get_id(session->endpoint));
+                       ast_log(LOG_ERROR, "Received REFER for remote session on channel '%s' from endpoint '%s' but 'external_replaces' extension not found in context %s\n",
+                               ast_channel_name(session->channel), ast_sorcery_object_get_id(session->endpoint), context);
                        return 404;
                }