res_rtp_asterisk & udptl: fix port selection to work with SELinux restrictions

ast_bind to a port reserved for another program by SELinux causes
errno == EACCES.  This caused random failures when binding rtp or
udptl sockets.  Treat EACCES as a non-fatal error, try next port.

(closes issue ASTERISK-23134)
Reported by: Corey Farrell
........

Merged revisions 406933 from http://svn.asterisk.org/svn/asterisk/branches/1.8


git-svn-id: https://origsvn.digium.com/svn/asterisk/branches/11@406934 65c4cc65-6c06-0410-ace0-fbb531ad65f3

main/udptl.c

@@ -1009,7 +1009,7 @@ struct ast_udptl *ast_udptl_new_with_bindaddr(struct ast_sched_context *sched, s
 		if (ast_bind(udptl->fd, &udptl->us) == 0) {
 			break;
 		}
-		if (errno != EADDRINUSE) {
+		if (errno != EADDRINUSE && errno != EACCES) {
 			ast_log(LOG_WARNING, "Unexpected bind error: %s\n", strerror(errno));
 			close(udptl->fd);
 			ast_free(udptl);

res/res_rtp_asterisk.c

@@ -1823,7 +1823,7 @@ static int ast_rtp_new(struct ast_rtp_instance *instance,
 		}
 
 		/* See if we ran out of ports or if the bind actually failed because of something other than the address being in use */
-		if (x == startplace || errno != EADDRINUSE) {
+		if (x == startplace || (errno != EADDRINUSE && errno != EACCES)) {
 			ast_log(LOG_ERROR, "Oh dear... we couldn't allocate a port for RTP instance '%p'\n", instance);
 			close(rtp->s);
 			ast_free(rtp);