Added an example application listening to duplicheck notifications

src/libcharon/plugins/duplicheck/.gitignore

@@ -0,0 +1 @@
+duplicheck

src/libcharon/plugins/duplicheck/Makefile.am

@@ -16,3 +16,6 @@ libstrongswan_duplicheck_la_SOURCES = duplicheck_plugin.h duplicheck_plugin.c \
 	duplicheck_notify.h duplicheck_notify.c
 
 libstrongswan_duplicheck_la_LDFLAGS = -module -avoid-version
+
+ipsec_PROGRAMS = duplicheck
+duplicheck_SOURCES = duplicheck.c

src/libcharon/plugins/duplicheck/duplicheck.c

@@ -0,0 +1,59 @@
+/*
+ * Copyright (C) 2011 Martin Willi
+ * Copyright (C) 2011 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 <sys/socket.h>
+#include <sys/un.h>
+#include <unistd.h>
+#include <stddef.h>
+#include <stdio.h>
+#include <errno.h>
+
+#define DUPLICHECK_SOCKET IPSEC_PIDDIR "/charon.dck"
+
+int main(int argc, char *argv[])
+{
+	struct sockaddr_un addr;
+	char buf[128];
+	int fd, len;
+
+	addr.sun_family = AF_UNIX;
+	strcpy(addr.sun_path, DUPLICHECK_SOCKET);
+
+	fd = socket(AF_UNIX, SOCK_SEQPACKET, 0);
+	if (fd < 0)
+	{
+		fprintf(stderr, "opening socket failed: %s\n", strerror(errno));
+		return 1;
+	}
+	if (connect(fd, (struct sockaddr *)&addr,
+			offsetof(struct sockaddr_un, sun_path) + strlen(addr.sun_path)) < 0)
+	{
+		fprintf(stderr, "connecting to %s failed: %s\n",
+				DUPLICHECK_SOCKET, strerror(errno));
+		close(fd);
+		return 1;
+	}
+	while (1)
+	{
+		len = recv(fd, &buf, sizeof(buf) - 1, 0);
+		if (len < 0)
+		{
+			fprintf(stderr, "reading from socket failed: %s\n", strerror(errno));
+			close(fd);
+			return 1;
+		}
+		printf("%.*s\n", len, buf);
+	}
+}