Merged revisions 119237 via svnmerge from

https://origsvn.digium.com/svn/asterisk/branches/1.2

........
r119237 | russell | 2008-05-30 07:49:39 -0500 (Fri, 30 May 2008) | 7 lines

- Instead of only enforcing destination call number checking on an ACK, check
  all full frames except for PING and LAGRQ, which may be sent by older versions
  too quickly to contain the destination call number.
  (As suggested by Tim Panton on the asterisk-dev list)
- Merge changes from team/russell/iax2-frame-race, which prevents PING and LAGRQ
  from being sent before the destination call number is known.

........


git-svn-id: http://svn.digium.com/svn/asterisk/branches/1.4@119238 f38db490-d61c-443f-a65b-d21fe96a405b

1 files changed, 37 insertions, 7 deletions

diff --git a/channels/chan_iax2.c b/channels/chan_iax2.c
index 4f2ad60f1..a9ce7915f 100644
--- a/channels/chan_iax2.c
+++ b/channels/chan_iax2.c
@@ -993,12 +993,19 @@ static int send_ping(const void *data);
 
 static void __send_ping(const void *data)
 {
-	int callno = (long)data;
+	int callno = (long) data;
+
 	ast_mutex_lock(&iaxsl[callno]);
-	if (iaxs[callno] && iaxs[callno]->pingid != -1) {
+
+	while (iaxs[callno] && iaxs[callno]->pingid != -1) {
+		if (!iaxs[callno]->peercallno) {
+			break;
+		}
 		send_command(iaxs[callno], AST_FRAME_IAX, IAX_COMMAND_PING, 0, NULL, 0, -1);
 		iaxs[callno]->pingid = iax2_sched_add(sched, ping_time * 1000, send_ping, data);
+		break;
 	}
+
 	ast_mutex_unlock(&iaxsl[callno]);
 }
 
@@ -1027,13 +1034,19 @@ static int send_lagrq(const void *data);
 
 static void __send_lagrq(const void *data)
 {
-	int callno = (long)data;
-	/* Ping only if it's real not if it's bridged */
+	int callno = (long) data;
+
 	ast_mutex_lock(&iaxsl[callno]);
-	if (iaxs[callno] && iaxs[callno]->lagid > -1) {
+
+	while (iaxs[callno] && iaxs[callno]->lagid > -1) {
+		if (!iaxs[callno]->peercallno) {
+			break;
+		}
 		send_command(iaxs[callno], AST_FRAME_IAX, IAX_COMMAND_LAGRQ, 0, NULL, 0, -1);
 		iaxs[callno]->lagid = iax2_sched_add(sched, lagrq_time * 1000, send_lagrq, data);
+		break;
 	}
+
 	ast_mutex_unlock(&iaxsl[callno]);
 }
 
@@ -7128,8 +7141,25 @@ static int socket_process(struct iax2_thread *thread)
 	}
 
 	if (!fr->callno) {
-		fr->callno = find_callno(ntohs(mh->callno) & ~IAX_FLAG_FULL, dcallno, &sin, new, fd, 
-			(ntohs(mh->callno) & IAX_FLAG_FULL) && f.frametype == AST_FRAME_IAX && f.subclass == IAX_COMMAND_ACK);
+		int check_dcallno = 0;
+
+		/*
+		 * We enforce accurate destination call numbers for all full frames except
+		 * LAGRQ and PING commands.  This is because older versions of Asterisk
+		 * schedule these commands to get sent very quickly, and they will sometimes
+		 * be sent before they receive the first frame from the other side.  When
+		 * that happens, it doesn't contain the destination call number.  However,
+		 * not checking it for these frames is safe.
+		 * 
+		 * Discussed in the following thread:
+		 *    http://lists.digium.com/pipermail/asterisk-dev/2008-May/033217.html 
+		 */
+
+		if (ntohs(mh->callno) & IAX_FLAG_FULL) {
+			check_dcallno = f.frametype == AST_FRAME_IAX ? (f.subclass != IAX_COMMAND_PING && f.subclass != IAX_COMMAND_LAGRQ) : 1;
+		}
+
+		fr->callno = find_callno(ntohs(mh->callno) & ~IAX_FLAG_FULL, dcallno, &sin, new, fd, check_dcallno);
 	}
 
 	if (fr->callno > 0)