Bug fix for MixMonitor involving filenames with '.' not in the extension

Closes issue #18391)
Reported by: pabelanger
Patches: 
      bugfix.patch uploaded by jrose (license 1225)
Tested by: jrose


git-svn-id: https://origsvn.digium.com/svn/asterisk/branches/1.4@309856 65c4cc65-6c06-0410-ace0-fbb531ad65f3

apps/app_mixmonitor.c

@@ -244,6 +244,7 @@ static void *mixmonitor_thread(void *obj)
 	struct ast_filestream **fs = NULL;
 	unsigned int oflags;
 	char *ext;
+	char *last_slash;
 	int errflag = 0;
 
 	if (option_verbose > 1)
@@ -277,7 +278,8 @@ static void *mixmonitor_thread(void *obj)
 				oflags = O_CREAT | O_WRONLY;
 				oflags |= ast_test_flag(mixmonitor, MUXFLAG_APPEND) ? O_APPEND : O_TRUNC;
 
-				if ((ext = strrchr(mixmonitor->filename, '.')))
+				last_slash = strrchr(mixmonitor->filename, '/');
+				if ((ext = strrchr(mixmonitor->filename, '.')) && (ext > last_slash))
 					*(ext++) = '\0';
 				else
 					ext = "raw";