Added missing libct_proto_icmp file

1 files changed, 110 insertions, 0 deletions

diff --git a/extensions/libct_proto_icmp.c b/extensions/libct_proto_icmp.c
new file mode 100644
index 0000000..43ffa30
--- /dev/null
+++ b/extensions/libct_proto_icmp.c
@@ -0,0 +1,110 @@
+/*
+ * (C) 2005 by Pablo Neira Ayuso <pablo@eurodev.net>
+ *
+ *      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.
+ *
+ */
+#include <stdio.h>
+#include <getopt.h>
+#include <stdlib.h>
+#include <netinet/in.h> /* For htons */
+#include <linux/netfilter_ipv4/ip_conntrack_tuple.h>
+#include <linux/netfilter_ipv4/ip_conntrack.h>
+#include "libct_proto.h"
+
+static struct option opts[] = {
+	{"--icmp-type", 1, 0, '1'},
+	{"--icmp-code", 1, 0, '2'},
+	{"--icmp-id", 1, 0, '3'},
+	{0, 0, 0, 0}
+};
+
+enum icmp_param_flags {
+	ICMP_TYPE_BIT = 0,
+	ICMP_TYPE = (1 << ICMP_TYPE_BIT),
+
+	ICMP_CODE_BIT = 1,
+	ICMP_CODE = (1 << ICMP_CODE_BIT),
+
+	ICMP_ID_BIT = 2,
+	ICMP_ID = (1 << ICMP_ID_BIT)
+};
+
+void help()
+{
+	fprintf(stdout, "--icmp-type            icmp type\n");
+	fprintf(stdout, "--icmp-code            icmp code\n");
+	fprintf(stdout, "--icmp-id              icmp id\n");
+}
+
+int parse(char c, char *argv[], 
+	   struct ip_conntrack_tuple *orig,
+	   struct ip_conntrack_tuple *reply,
+	   union ip_conntrack_proto *proto,
+	   unsigned int *flags)
+{
+	switch(c) {
+		case '1':
+			if (optarg) {
+				orig->dst.u.icmp.type = atoi(optarg);
+				*flags |= ICMP_TYPE;
+			}
+			break;
+		case '2':
+			if (optarg) {
+				orig->dst.u.icmp.code = atoi(optarg);
+				*flags |= ICMP_CODE;
+			}
+			break;
+		case '3':
+			if (optarg) {
+				reply->src.u.icmp.id = atoi(optarg);
+				*flags |= ICMP_ID;
+			}
+			break;
+	}
+	return 1;
+}
+
+int final_check(unsigned int flags)
+{
+	if (!(flags & ICMP_TYPE))
+		return 0;
+	else if (!(flags & ICMP_CODE))
+		return 0;
+
+	return 1;
+}
+
+void print_tuple(struct ip_conntrack_tuple *t)
+{
+	fprintf(stdout, "type=%d code=%d id=%d", t->dst.u.icmp.type, 
+				             	 t->dst.u.icmp.code,
+						 t->src.u.icmp.id);
+}
+
+static struct ctproto_handler icmp = {
+	.name 		= "icmp",
+	.protonum	= 1,
+	.parse		= parse,
+	.print_tuple	= print_tuple,
+	.final_check	= final_check,
+	.help		= help,
+	.opts		= opts
+};
+
+void __attribute__ ((constructor)) init(void);
+void __attribute__ ((destructor)) fini(void);
+
+void init(void)
+{
+	register_proto(&icmp);
+}
+
+void fini(void)
+{
+	unregister_proto(&icmp);
+}