From 044e18dfaf14cae327d94ccfe7bd9fa5126d1b10 Mon Sep 17 00:00:00 2001
From: kadlec <kadlec>
Date: Mon, 9 Feb 2004 13:47:01 +0000
Subject: Userspace part of sets: ipset added (JK)

---
 extensions/libipt_set.c | 152 ++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 152 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 0000000..06691f3
--- /dev/null
+++ b/extensions/libipt_set.c
@@ -0,0 +1,152 @@
+/* Shared library add-on to iptables to add IP address set matching. */
+#include <stdio.h>
+#include <netdb.h>
+#include <string.h>
+#include <stdlib.h>
+#include <getopt.h>
+#include <ctype.h>
+#include <errno.h>
+
+#include <iptables.h>
+#include <linux/netfilter_ipv4/ip_conntrack.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"
+	       " [!] --set     name[:flags] flags\n"
+	       "		'name' is the set name from to match.\n" 
+	       "		'flags' are the comma separated list of\n"
+	       "		'src' and 'dst'.\n"
+	       "\n", IPTABLES_VERSION);
+}
+
+static struct option opts[] = {
+	{"set", 1, 0, '1'},
+	{0}
+};
+
+/* Initialize the match. */
+static void init(struct ipt_entry_match *match, unsigned int *nfcache)
+{
+	struct ipt_set_info_match *info = 
+		(struct ipt_set_info_match *) match->data;
+	
+
+	memset(info, 0, sizeof(struct ipt_set_info_match));
+	info->match.id = -1;
+
+	/* Can't cache this - XXX */
+	*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_set_info_match *myinfo = 
+		(struct ipt_set_info_match *) (*match)->data;
+	struct ipt_set_info *info = &myinfo->match;
+
+	switch (c) {
+	case '1':		/* --set <set>[:<flags>] <flags> */
+		check_inverse(optarg, &invert, &optind, 0);
+		if (invert)
+			info->flags[0] |= IPSET_MATCH_INV;
+
+		if (!argv[optind]
+		    || argv[optind][0] == '-' || argv[optind][0] == '!')
+			exit_error(PARAMETER_PROBLEM,
+				   "--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 --set.");
+		
+		*flags = 1;
+		break;
+
+	default:
+		return 0;
+	}
+
+	return 1;
+}
+
+/* Final check; must have specified --set. */
+static void final_check(unsigned int flags)
+{
+	if (!flags)
+		exit_error(PARAMETER_PROBLEM,
+			   "You must specify either `--set'");
+}
+
+static void
+print_match(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 %s", 
+		       (info->flags[0] & IPSET_MATCH_INV) ? "!" : "",
+		       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",
+			       i == info->set_level ? " " : ",",
+			       info->flags[i] & IPSET_SRC ? "src" : "dst");
+		printf(" ");
+	}
+}
+
+/* Prints out the matchinfo. */
+static void
+print(const struct ipt_ip *ip,
+      const struct ipt_entry_match *match, int numeric)
+{
+	struct ipt_set_info_match *info = 
+		(struct ipt_set_info_match *) match->data;
+
+	print_match("set", &info->match);
+}
+
+/* Saves the matchinfo in parsable form to stdout. */
+static void save(const struct ipt_ip *ip,
+		 const struct ipt_entry_match *match)
+{
+	struct ipt_set_info_match *info = 
+		(struct ipt_set_info_match *) match->data;
+
+	print_match("--set", &info->match);
+}
+
+static
+struct iptables_match set = { NULL,
+	.name		= "set",
+	.version	= IPTABLES_VERSION,
+	.size		= IPT_ALIGN(sizeof(struct ipt_set_info_match)),
+	.userspacesize	= IPT_ALIGN(sizeof(struct ipt_set_info_match)),
+	.help		= &help,
+	.init		= &init,
+	.parse		= &parse,
+	.final_check	= &final_check,
+	.print		= &print,
+	.save		= &save,
+	.extra_opts	= opts
+};
+
+void _init(void)
+{
+	register_match(&set);
+}
-- 
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