Update to the janitor project for making sure to be thread-safe when

retrieving the value of a channel variable. This covers app_queue.

This commit also incorporates a logical change. Previously, if MixMonitor
is to be used to record the call, all the arguments were parsed first. Then
the MixMonitor app would be located. Now the order of these operations has
been swapped. Now the app is located first so that we only go through the
work of parsing the arguments if the app was found.

(closes issue #12742)
Reported by: snuffy
Patches:
      bug_12742.diff uploaded by snuffy (license 35)



git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@118783 65c4cc65-6c06-0410-ace0-fbb531ad65f3

apps/app_queue.c

@@ -3438,11 +3438,15 @@ static int try_calling(struct queue_ent *qe, const char *options, char *announce
 		set_queue_variables(qe);
 		ao2_unlock(qe->parent);
 		
+		ast_channel_lock(qe->chan);
+		if ((monitorfilename = pbx_builtin_getvar_helper(qe->chan, "MONITOR_FILENAME"))) {
+				monitorfilename = ast_strdupa(monitorfilename);
+		}
+		ast_channel_unlock(qe->chan);
 		/* Begin Monitoring */
 		if (qe->parent->monfmt && *qe->parent->monfmt) {
 			if (!qe->parent->montype) {
 				ast_debug(1, "Starting Monitor as requested.\n");
-				monitorfilename = pbx_builtin_getvar_helper(qe->chan, "MONITOR_FILENAME");
 				if (pbx_builtin_getvar_helper(qe->chan, "MONITOR_EXEC") || pbx_builtin_getvar_helper(qe->chan, "MONITOR_EXEC_ARGS"))
 					which = qe->chan;
 				else
@@ -3457,8 +3461,10 @@ static int try_calling(struct queue_ent *qe, const char *options, char *announce
 					ast_monitor_start(which, qe->parent->monfmt, tmpid, 1, X_REC_IN | X_REC_OUT);
 				}
 			} else {
+				mixmonapp = pbx_findapp("MixMonitor");
+				
+				if (mixmonapp) {
 					ast_debug(1, "Starting MixMonitor as requested.\n");
-				monitorfilename = pbx_builtin_getvar_helper(qe->chan, "MONITOR_FILENAME");
 					if (!monitorfilename) {
 						if (qe->chan->cdr)
 							ast_copy_string(tmpid, qe->chan->cdr->uniqueid, sizeof(tmpid));
@@ -3487,8 +3493,16 @@ static int try_calling(struct queue_ent *qe, const char *options, char *announce
 						pbx_substitute_variables_helper(qe->chan, tmpid2, tmpid, sizeof(tmpid) - 1);
 					}
 
-				monitor_exec = pbx_builtin_getvar_helper(qe->chan, "MONITOR_EXEC");
+					ast_channel_lock(qe->chan);
-				monitor_options = pbx_builtin_getvar_helper(qe->chan, "MONITOR_OPTIONS");
+					if ((monitor_exec = pbx_builtin_getvar_helper(qe->chan, "MONITOR_EXEC"))) {
+							monitor_exec = ast_strdupa(monitor_exec);
+					}
+					if ((monitor_options = pbx_builtin_getvar_helper(qe->chan, "MONITOR_OPTIONS"))) {
+							monitor_options = ast_strdupa(monitor_options);
+					} else {
+						monitor_options = "";
+					}
+					ast_channel_unlock(qe->chan);
 
 					if (monitor_exec) {
 						const char *m = monitor_exec;
@@ -3515,12 +3529,6 @@ static int try_calling(struct queue_ent *qe, const char *options, char *announce
 	
 					snprintf(tmpid2, sizeof(tmpid2), "%s.%s", tmpid, qe->parent->monfmt);
 
-				mixmonapp = pbx_findapp("MixMonitor");
-
-				if (!monitor_options)
-					monitor_options = "";
-				
-				if (mixmonapp) {
 					if (!ast_strlen_zero(monitor_exec))
 						snprintf(mixmonargs, sizeof(mixmonargs), "%s,b%s,%s", tmpid2, monitor_options, monitor_exec);
 					else
@@ -3534,9 +3542,9 @@ static int try_calling(struct queue_ent *qe, const char *options, char *announce
 					if (qe->chan->cdr)
 						ast_clear_flag(qe->chan->cdr, AST_CDR_FLAG_LOCKED);
 
-				} else
+				} else {
 					ast_log(LOG_WARNING, "Asked to run MixMonitor on this call, but cannot find the MixMonitor app!\n");
-
+				}
 			}
 		}
 		/* Drop out of the queue at this point, to prepare for next caller */
@@ -4449,6 +4457,7 @@ static int queue_exec(struct ast_channel *chan, void *data)
 		qe.expire = 0;
 
 	/* Get the priority from the variable ${QUEUE_PRIO} */
+	ast_channel_lock(chan);
 	user_priority = pbx_builtin_getvar_helper(chan, "QUEUE_PRIO");
 	if (user_priority) {
 		if (sscanf(user_priority, "%d", &prio) == 1) {
@@ -4488,6 +4497,7 @@ static int queue_exec(struct ast_channel *chan, void *data)
 	} else {
 		min_penalty = 0;
 	}
+	ast_channel_unlock(chan);
 
 	if (args.options && (strchr(args.options, 'r')))
 		ringing = 1;