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/* Copyright (C) 2000-2002 Joakim Axelsson <gozem@linux.nu>
* Patrick Schaaf <bof@bof.de>
* Martin Josefsson <gandalf@wlug.westbo.se>
* Copyright (C) 2003-2004 Jozsef Kadlecsik <kadlec@blackhole.kfki.hu>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
/* Shared library add-on to iptables to add IP 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/ipt_set.h>
#include "libipt_set.h"
/* Function which prints out usage message. */
static void set_help(void)
{
printf("set match options:\n"
" [!] --set name flags\n"
" 'name' is the set name from to match,\n"
" 'flags' are the comma separated list of\n"
" 'src' and 'dst'.\n");
}
static const struct option set_opts[] = {
{"set", 1, 0, '1'},
{0}
};
/* Initialize the match. */
static void set_init(struct xt_entry_match *match)
{
struct ipt_set_info_match *info =
(struct ipt_set_info_match *) match->data;
memset(info, 0, sizeof(struct ipt_set_info_match));
}
/* Function which parses command options; returns true if it ate an option */
static int set_parse(int c, char **argv, int invert, unsigned int *flags,
const void *entry, struct xt_entry_match **match)
{
struct ipt_set_info_match *myinfo =
(struct ipt_set_info_match *) (*match)->data;
struct ipt_set_info *info = &myinfo->match_set;
switch (c) {
case '1': /* --set <set> <flag>[,<flag> */
if (info->flags[0])
exit_error(PARAMETER_PROBLEM,
"--set can be specified only once");
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.");
if (strlen(argv[optind-1]) > IP_SET_MAXNAMELEN - 1)
exit_error(PARAMETER_PROBLEM,
"setname `%s' too long, max %d characters.",
argv[optind-1], IP_SET_MAXNAMELEN - 1);
get_set_byname(argv[optind - 1], info);
parse_bindings(argv[optind], info);
DEBUGP("parse: set index %u\n", info->index);
optind++;
*flags = 1;
break;
default:
return 0;
}
return 1;
}
/* Final check; must have specified --set. */
static void set_check(unsigned int flags)
{
if (!flags)
exit_error(PARAMETER_PROBLEM,
"You must specify `--set' with proper arguments");
DEBUGP("final check OK\n");
}
static void
print_match(const char *prefix, const struct ipt_set_info *info)
{
int i;
char setname[IP_SET_MAXNAMELEN];
get_set_byid(setname, info->index);
printf("%s%s %s",
(info->flags[0] & IPSET_MATCH_INV) ? "! " : "",
prefix,
setname);
for (i = 0; i < IP_SET_MAX_BINDINGS; i++) {
if (!info->flags[i])
break;
printf("%s%s",
i == 0 ? " " : ",",
info->flags[i] & IPSET_SRC ? "src" : "dst");
}
printf(" ");
}
/* Prints out the matchinfo. */
static void set_print(const void *ip, const struct xt_entry_match *match,
int numeric)
{
struct ipt_set_info_match *info =
(struct ipt_set_info_match *) match->data;
print_match("set", &info->match_set);
}
/* Saves the matchinfo in parsable form to stdout. */
static void set_save(const void *ip, const struct xt_entry_match *match)
{
struct ipt_set_info_match *info =
(struct ipt_set_info_match *) match->data;
print_match("--set", &info->match_set);
}
static struct xtables_match set_mt_reg = {
.name = "set",
.version = XTABLES_VERSION,
.family = PF_INET,
.size = XT_ALIGN(sizeof(struct ipt_set_info_match)),
.userspacesize = XT_ALIGN(sizeof(struct ipt_set_info_match)),
.help = set_help,
.init = set_init,
.parse = set_parse,
.final_check = set_check,
.print = set_print,
.save = set_save,
.extra_opts = set_opts,
};
void _init(void)
{
xtables_register_match(&set_mt_reg);
}
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