From fff625c9e5e910b12a2e12355aaeac3e54e3dfa2 Mon Sep 17 00:00:00 2001
From: laforge <laforge>
Date: Sat, 31 May 2003 17:11:49 +0000
Subject: add XOR patch by Tim Vandermeersch

---
 extensions/libipt_XOR.c | 112 ++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 112 insertions(+)
 create mode 100644 extensions/libipt_XOR.c

(limited to 'extensions/libipt_XOR.c')

diff --git a/extensions/libipt_XOR.c b/extensions/libipt_XOR.c
new file mode 100644
index 0000000..3b05a30
--- /dev/null
+++ b/extensions/libipt_XOR.c
@@ -0,0 +1,112 @@
+/* Shared library add-on to iptables for the XOR target
+ * (C) 2000 by Tim Vandermeersch <Tim.Vandermeersch@pandora.be>
+ * Based on libipt_TTL.c
+ *
+ * Version 1.0
+ *
+ * This program is distributed under the terms of GNU GPL
+ */
+
+#include <stdio.h>
+#include <string.h>
+#include <stdlib.h>
+#include <getopt.h>
+#include <iptables.h>
+
+#include <linux/netfilter_ipv4/ip_tables.h>
+#include <linux/netfilter_ipv4/ipt_XOR.h>
+
+#define	IPT_KEY_SET		1
+#define IPT_BLOCKSIZE_SET	2
+
+static void init(struct ipt_entry_target *t, unsigned int *nfcache) 
+{
+}
+
+static void help(void) 
+{
+	printf(
+		"XOR target v%s options\n"
+		"  --key string	          Set key to \"string\"\n"
+		"  --block-size		  Set block size\n",
+		IPTABLES_VERSION);
+}
+
+static int parse(int c, char **argv, int invert, unsigned int *flags,
+		const struct ipt_entry *entry, 
+		struct ipt_entry_target **target)
+{
+	struct ipt_XOR_info *info = (struct ipt_XOR_info *) (*target)->data;
+	
+	if (!optarg)
+		exit_error(PARAMETER_PROBLEM, "XOR: too few arguments");
+	
+	if (check_inverse(optarg, &invert, NULL, 0))
+		exit_error(PARAMETER_PROBLEM, "XOR: unexpected '!'");
+
+	switch (c) {	
+		case '1':
+			strncpy(info->key, optarg, 30);
+			*flags |= IPT_KEY_SET;
+			break;
+		case '2':
+			info->block_size = atoi(optarg);
+			*flags |= IPT_BLOCKSIZE_SET;
+			break;
+		default:
+			return 0;
+	}
+	
+	return 1;
+}
+
+static void final_check(unsigned int flags)
+{
+	if (!(flags & IPT_KEY_SET))
+		exit_error(PARAMETER_PROBLEM, "XOR: You must specify a key");
+	if (!(flags & IPT_BLOCKSIZE_SET))
+		exit_error(PARAMETER_PROBLEM, "XOR: You must specify a block-size");
+}
+
+static void save (const struct ipt_ip *ip,
+		const struct ipt_entry_target *target)
+{
+	const struct ipt_XOR_info *info = (struct ipt_XOR_info *) target->data;
+
+	printf("--key %s ", info->key);
+	printf("--block-size %u ", info->block_size);
+}
+
+static void print (const struct ipt_ip *ip,
+	const struct ipt_entry_target *target, int numeric)
+{
+	const struct ipt_XOR_info *info = (struct ipt_XOR_info *) target->data;
+
+	printf("key: %s ", info->key);
+	printf("block-size: %u ", info->block_size);
+}
+
+static struct option opts[] = {
+	{ "key", 1, 0, '1' },
+	{ "block-size", 1, 0, '2' },
+	{ 0 }
+};
+
+static struct iptables_target XOR = { NULL, 
+	"XOR",
+	IPTABLES_VERSION,
+	IPT_ALIGN(sizeof(struct ipt_XOR_info)),
+	IPT_ALIGN(sizeof(struct ipt_XOR_info)),
+	&help,
+	&init,
+	&parse,
+	&final_check,
+	&print,
+	&save,
+	opts 
+};
+
+void _init(void)
+{
+	register_target(&XOR);
+}
-- 
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