From 9c50ebe1b02335cfacbee0472d9c5f83612c6016 Mon Sep 17 00:00:00 2001
From: Joszef Kadlecsik <kadlec@blackhole.kfki.hu>
Date: Mon, 9 Feb 2004 13:47:01 +0000
Subject: Userspace part of sets: ipset added (JK)

---
 extensions/libipt_SET.c | 174 ++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 174 insertions(+)
 create mode 100644 extensions/libipt_SET.c

(limited to 'extensions/libipt_SET.c')

diff --git a/extensions/libipt_SET.c b/extensions/libipt_SET.c
new file mode 100644
index 00000000..48c722a7
--- /dev/null
+++ b/extensions/libipt_SET.c
@@ -0,0 +1,174 @@
+/* Shared library add-on to iptables to add IP set mangling target. */
+#include <stdio.h>
+#include <netdb.h>
+#include <string.h>
+#include <stdlib.h>
+#include <getopt.h>
+#include <ctype.h>
+
+#include <iptables.h>
+#include <linux/netfilter_ipv4/ip_tables.h>
+#include <linux/netfilter_ipv4/ip_nat_rule.h>
+#include <linux/netfilter_ipv4/ip_set.h>
+#include <linux/netfilter_ipv4/ipt_set.h>
+#include "../ipset/libipt_set.h"
+
+/* Function which prints out usage message. */
+static void help(void)
+{
+	printf("SET v%s options:\n"
+	       " --add-set name[:flags] flags\n"
+	       " --del-set name[:flags] flags\n"
+	       "		add/del src/dst IP/port from/to named sets,\n"
+	       "		where flags are the comma separated list of\n"
+	       "		'src' and 'dst'.\n"
+	       "\n", IPTABLES_VERSION);
+}
+
+static struct option opts[] = {
+	{"add-set",   1, 0, '1'},
+	{"del-set",   1, 0, '2'},
+	{0}
+};
+
+/* Initialize the target. */
+static void init(struct ipt_entry_target *target, unsigned int *nfcache)
+{
+	struct ipt_set_info_target *info =
+	    (struct ipt_set_info_target *) target->data;
+
+	memset(info, 0, sizeof(struct ipt_set_info_target));
+	info->add_set.id = -1;
+	info->del_set.id = -1;
+
+	/* Can't cache this */
+	*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, struct ipt_entry_target **target)
+{
+	struct ipt_set_info_target *myinfo =
+	    (struct ipt_set_info_target *) (*target)->data;
+	struct ipt_set_info *info;
+
+	switch (c) {
+	case '1':		/* --add-set <set>[:<flags>] <flags> */
+		info = &myinfo->add_set;
+
+		if (check_inverse(optarg, &invert, NULL, 0))
+			exit_error(PARAMETER_PROBLEM,
+				   "Unexpected `!' after --add-set");
+
+		if (!argv[optind]
+		    || argv[optind][0] == '-' || argv[optind][0] == '!')
+			exit_error(PARAMETER_PROBLEM,
+				   "--add-set requires two args.");
+
+		parse_pool(argv[optind - 1], info);
+		parse_ipflags(argv[optind++], info);
+		
+		*flags = 1;
+		break;
+	case '2':		/* --del-set <set>[:<flags>] <flags> */
+		info = &myinfo->del_set;
+
+		if (check_inverse(optarg, &invert, NULL, 0))
+			exit_error(PARAMETER_PROBLEM,
+				   "Unexpected `!' after --del-set");
+
+		if (!argv[optind]
+		    || argv[optind][0] == '-' || argv[optind][0] == '!')
+			exit_error(PARAMETER_PROBLEM,
+				   "--del-set requires two args.");
+
+		parse_pool(argv[optind - 1], info);
+		if (parse_ipflags(argv[optind++], info))
+			exit_error(PARAMETER_PROBLEM,
+				   "Can't use overwrite flag with --del-set.");
+		
+		*flags = 1;
+		break;
+
+	default:
+		return 0;
+	}
+	return 1;
+}
+
+/* Final check; must specify at least one. */
+static void final_check(unsigned int flags)
+{
+	if (!flags)
+		exit_error(PARAMETER_PROBLEM,
+			   "You must specify either `--add-set' or `--del-set'");
+}
+
+static void
+print_target(const char *prefix, const struct ipt_set_info *info)
+{
+	int i;
+	char setname[IP_SET_MAXNAMELEN];
+
+	if (info->id >= 0) {
+		get_set_byid(setname, info->id);
+		printf("%s %s", prefix, setname);
+		for (i = 0; i < info->set_level; i++)
+			printf("%s%s",
+			       i == 0 ? ":" : ",",
+			       info->flags[i] & IPSET_SRC ? "src" : "dst");
+		for (i = info->set_level; i < info->ip_level; i++)
+			printf("%s%s%s",
+			       i == info->set_level ? " " : ",",
+			       info->flags[i] & IPSET_ADD_OVERWRITE ? "+" : "",
+			       info->flags[i] & IPSET_SRC ? "src" : "dst");
+		printf(" ");
+	}
+}
+
+/* Prints out the targinfo. */
+static void
+print(const struct ipt_ip *ip,
+      const struct ipt_entry_target *target, int numeric)
+{
+	struct ipt_set_info_target *info =
+	    (struct ipt_set_info_target *) target->data;
+
+	print_target("add-set", &info->add_set);
+	print_target("del-set", &info->del_set);
+}
+
+/* Saves the union ipt_targinfo in parsable form to stdout. */
+static void
+save(const struct ipt_ip *ip, const struct ipt_entry_target *target)
+{
+	struct ipt_set_info_target *info =
+	    (struct ipt_set_info_target *) target->data;
+
+	print_target("--add-set", &info->add_set);
+	print_target("--del-set", &info->del_set);
+}
+
+static
+struct iptables_target ipt_set_target 
+= {
+	.name		= "SET",
+	.version	= IPTABLES_VERSION,
+	.size		= IPT_ALIGN(sizeof(struct ipt_set_info_target)),
+	.userspacesize	= IPT_ALIGN(sizeof(struct ipt_set_info_target)),
+	.help		= &help,
+	.init		= &init,
+	.parse		= &parse,
+	.final_check	= &final_check,
+	.print		= &print,
+	.save		= &save,
+	.extra_opts	= opts
+};
+
+void _init(void)
+{
+	register_target(&ipt_set_target);
+}
-- 
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