From b58ee5402818d3bf5ca506749c6a6402ca3a8c1b Mon Sep 17 00:00:00 2001
From: Harald Welte <laforge@gnumonks.org>
Date: Tue, 17 Feb 2004 20:56:40 +0000
Subject: add childlevel match support

---
 extensions/libipt_childlevel.c | 122 +++++++++++++++++++++++++++++++++++++++++
 1 file changed, 122 insertions(+)
 create mode 100644 extensions/libipt_childlevel.c

(limited to 'extensions/libipt_childlevel.c')

diff --git a/extensions/libipt_childlevel.c b/extensions/libipt_childlevel.c
new file mode 100644
index 00000000..bc9f0ad9
--- /dev/null
+++ b/extensions/libipt_childlevel.c
@@ -0,0 +1,122 @@
+/* 
+   Shared library add-on to iptables to add layer 7 matching support. 
+
+   http://l7-filter.sf.net
+  
+   By Matthew Strait <quadong@users.sf.net>, Dec 2003.
+
+   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.
+   http://www.gnu.org/licenses/gpl.txt
+*/
+
+#define _GNU_SOURCE
+#include <stdio.h>
+#include <netdb.h>
+#include <string.h>
+#include <stdlib.h>
+#include <getopt.h>
+#include <ctype.h>
+#include <dirent.h>
+
+#include <iptables.h>
+#include <linux/netfilter_ipv4/ipt_childlevel.h>
+
+/* Function which prints out usage message. */
+static void help(void)
+{
+	printf(
+	"CHILDLEVEL match v%s options:\n"
+	"--level <n>  : Match childlevel n (0 == master)\n",
+	IPTABLES_VERSION);
+	fputc('\n', stdout);
+}
+
+static struct option opts[] = {
+	{ .name = "level", .has_arg = 1, .flag = 0, .val = '1' },
+	{ .name = 0 }
+};
+
+/* Initialize the match. */
+static void init(struct ipt_entry_match *m, unsigned int *nfcache)
+{
+	*nfcache |= NFC_UNKNOWN;
+}
+
+/* Function which parses command options; returns true if it ate an option */
+static int parse(int c, char **argv, int invert, unsigned int *flags,
+      const struct ipt_entry *entry, unsigned int *nfcache,
+      struct ipt_entry_match **match)
+{
+	struct ipt_childlevel_info *childlevelinfo = 
+		(struct ipt_childlevel_info *)(*match)->data;
+
+	switch (c) {
+	case '1':
+		check_inverse(optarg, &invert, &optind, 0);
+		childlevelinfo->childlevel = atoi(argv[optind-1]);
+		if (invert)
+			childlevelinfo->invert = 1;
+		*flags = 1;
+		break;
+	default:
+		return 0;
+	}
+
+	return 1;
+}
+
+/* Final check; must have specified --level. */
+static void final_check(unsigned int flags)
+{
+	if (!flags)
+		exit_error(PARAMETER_PROBLEM,
+			   "CHILDLEVEL match: You must specify `--level'");
+}
+
+static void print_protocol(int n, int invert, int numeric)
+{
+	fputs("childlevel ", stdout);
+	if (invert) fputc('!', stdout);
+	printf("%d ", n);
+}
+
+/* Prints out the matchinfo. */
+static void print(const struct ipt_ip *ip,
+      const struct ipt_entry_match *match,
+      int numeric)
+{
+	printf("CHILDLEVEL ");
+
+	print_protocol(((struct ipt_childlevel_info *)match->data)->childlevel,
+		  ((struct ipt_childlevel_info *)match->data)->invert, numeric);
+}
+/* Saves the union ipt_matchinfo in parsable form to stdout. */
+static void save(const struct ipt_ip *ip, const struct ipt_entry_match *match)
+{
+        const struct ipt_childlevel_info *info =
+            (const struct ipt_childlevel_info*) match->data;
+
+        printf("--childlevel %s%d ", (info->invert) ? "! ": "", info->childlevel);
+}
+
+static struct iptables_match childlevel = { 
+	.name		= "childlevel",
+	.version	= IPTABLES_VERSION,
+	.size		= IPT_ALIGN(sizeof(struct ipt_childlevel_info)),
+	.userspacesize	= IPT_ALIGN(sizeof(struct ipt_childlevel_info)),
+	.help		= &help,
+	.init		= &init,
+	.parse		= &parse,
+	.final_check	= &final_check,
+	.print		= &print,
+	.save		= &save,
+	.extra_opts	= opts
+};
+
+void _init(void)
+{
+	register_match(&childlevel);
+}
-- 
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