Add an error-notify sample application to listen to error notifications

src/libcharon/plugins/error_notify/.gitignore

@@ -0,0 +1 @@
+error-notify

src/libcharon/plugins/error_notify/Makefile.am

@@ -17,3 +17,6 @@ libstrongswan_error_notify_la_SOURCES = \
 	error_notify_listener.h error_notify_listener.c
 
 libstrongswan_error_notify_la_LDFLAGS = -module -avoid-version
+
+ipsec_PROGRAMS = error-notify
+error_notify_SOURCES = error_notify.c

src/libcharon/plugins/error_notify/error_notify.c

@@ -0,0 +1,62 @@
+/*
+ * Copyright (C) 2012 Martin Willi
+ * Copyright (C) 2012 revosec AG
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2 of the License, or (at your
+ * option) any later version.  See <http://www.fsf.org/copyleft/gpl.txt>.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+ * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * for more details.
+ */
+
+#include "error_notify_msg.h"
+
+#include <stdio.h>
+#include <unistd.h>
+#include <sys/stat.h>
+#include <sys/socket.h>
+#include <sys/un.h>
+#include <errno.h>
+
+/**
+ * Example of a simple notification listener
+ */
+int main(int argc, char *argv[])
+{
+	struct sockaddr_un addr;
+	error_notify_msg_t msg;
+	int s;
+
+	addr.sun_family = AF_UNIX;
+	strcpy(addr.sun_path, ERROR_NOTIFY_SOCKET);
+
+	s = socket(AF_UNIX, SOCK_SEQPACKET, 0);
+	if (s < 0)
+	{
+		fprintf(stderr, "opening socket failed: %s\n", strerror(errno));
+		return 1;
+	}
+	if (connect(s, (struct sockaddr *)&addr, sizeof(addr)) < 0)
+	{
+		fprintf(stderr, "connect failed: %s\n", strerror(errno));
+		close(s);
+		return 1;
+	}
+	while (1)
+	{
+		if (read(s, &msg, sizeof(msg)) != sizeof(msg))
+		{
+			fprintf(stderr, "read failed: %s\n", strerror(errno));
+			close(s);
+			return 1;
+		}
+		printf("%d %s %s %s %s\n",
+			   msg.type, msg.name, msg.id, msg.ip, msg.str);
+	}
+	close(s);
+	return 0;
+}