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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) 2003-2010 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 <stdbool.h>
#include <stdio.h>
#include <netdb.h>
#include <string.h>
#include <stdlib.h>
#include <getopt.h>
#include <ctype.h>
#include <errno.h>
#include <xtables.h>
#include <linux/netfilter/xt_set.h>
#include "libxt_set.h"
/* Revision 0 */
static void
set_help_v0(void)
{
printf("set match options:\n"
" [!] --match-set name flags\n"
" 'name' is the set name from to match,\n"
" 'flags' are the comma separated list of\n"
" 'src' and 'dst' specifications.\n");
}
static const struct option set_opts_v0[] = {
{.name = "match-set", .has_arg = true, .val = '1'},
{.name = "set", .has_arg = true, .val = '2'},
XT_GETOPT_TABLEEND,
};
static void
set_check_v0(unsigned int flags)
{
if (!flags)
xtables_error(PARAMETER_PROBLEM,
"You must specify `--match-set' with proper arguments");
}
static int
set_parse_v0(int c, char **argv, int invert, unsigned int *flags,
const void *entry, struct xt_entry_match **match)
{
struct xt_set_info_match_v0 *myinfo =
(struct xt_set_info_match_v0 *) (*match)->data;
struct xt_set_info_v0 *info = &myinfo->match_set;
switch (c) {
case '2':
fprintf(stderr,
"--set option deprecated, please use --match-set\n");
case '1': /* --match-set <set> <flag>[,<flag> */
if (info->u.flags[0])
xtables_error(PARAMETER_PROBLEM,
"--match-set can be specified only once");
xtables_check_inverse(optarg, &invert, &optind, 0, argv);
if (invert)
info->u.flags[0] |= IPSET_MATCH_INV;
if (!argv[optind]
|| argv[optind][0] == '-'
|| argv[optind][0] == '!')
xtables_error(PARAMETER_PROBLEM,
"--match-set requires two args.");
if (strlen(optarg) > IPSET_MAXNAMELEN - 1)
xtables_error(PARAMETER_PROBLEM,
"setname `%s' too long, max %d characters.",
optarg, IPSET_MAXNAMELEN - 1);
get_set_byname(optarg, (struct xt_set_info *)info);
parse_dirs_v0(argv[optind], info);
DEBUGP("parse: set index %u\n", info->index);
optind++;
*flags = 1;
break;
}
return 1;
}
static void
print_match_v0(const char *prefix, const struct xt_set_info_v0 *info)
{
int i;
char setname[IPSET_MAXNAMELEN];
get_set_byid(setname, info->index);
printf("%s %s %s",
(info->u.flags[0] & IPSET_MATCH_INV) ? " !" : "",
prefix,
setname);
for (i = 0; i < IPSET_DIM_MAX; i++) {
if (!info->u.flags[i])
break;
printf("%s%s",
i == 0 ? " " : ",",
info->u.flags[i] & IPSET_SRC ? "src" : "dst");
}
}
/* Prints out the matchinfo. */
static void
set_print_v0(const void *ip, const struct xt_entry_match *match, int numeric)
{
const struct xt_set_info_match_v0 *info = (const void *)match->data;
print_match_v0("match-set", &info->match_set);
}
static void
set_save_v0(const void *ip, const struct xt_entry_match *match)
{
const struct xt_set_info_match_v0 *info = (const void *)match->data;
print_match_v0("--match-set", &info->match_set);
}
/* Revision 1 */
#define set_help_v1 set_help_v0
#define set_opts_v1 set_opts_v0
#define set_check_v1 set_check_v0
static int
set_parse_v1(int c, char **argv, int invert, unsigned int *flags,
const void *entry, struct xt_entry_match **match)
{
struct xt_set_info_match_v1 *myinfo =
(struct xt_set_info_match_v1 *) (*match)->data;
struct xt_set_info *info = &myinfo->match_set;
switch (c) {
case '2':
fprintf(stderr,
"--set option deprecated, please use --match-set\n");
case '1': /* --match-set <set> <flag>[,<flag> */
if (info->dim)
xtables_error(PARAMETER_PROBLEM,
"--match-set can be specified only once");
xtables_check_inverse(optarg, &invert, &optind, 0, argv);
if (invert)
info->flags |= IPSET_INV_MATCH;
if (!argv[optind]
|| argv[optind][0] == '-'
|| argv[optind][0] == '!')
xtables_error(PARAMETER_PROBLEM,
"--match-set requires two args.");
if (strlen(optarg) > IPSET_MAXNAMELEN - 1)
xtables_error(PARAMETER_PROBLEM,
"setname `%s' too long, max %d characters.",
optarg, IPSET_MAXNAMELEN - 1);
get_set_byname(optarg, info);
parse_dirs(argv[optind], info);
DEBUGP("parse: set index %u\n", info->index);
optind++;
*flags = 1;
break;
}
return 1;
}
static void
print_match(const char *prefix, const struct xt_set_info *info)
{
int i;
char setname[IPSET_MAXNAMELEN];
get_set_byid(setname, info->index);
printf("%s %s %s",
(info->flags & IPSET_INV_MATCH) ? " !" : "",
prefix,
setname);
for (i = 1; i <= info->dim; i++) {
printf("%s%s",
i == 1 ? " " : ",",
info->flags & (1 << i) ? "src" : "dst");
}
}
/* Prints out the matchinfo. */
static void
set_print_v1(const void *ip, const struct xt_entry_match *match, int numeric)
{
const struct xt_set_info_match_v1 *info = (const void *)match->data;
print_match("match-set", &info->match_set);
}
static void
set_save_v1(const void *ip, const struct xt_entry_match *match)
{
const struct xt_set_info_match_v1 *info = (const void *)match->data;
print_match("--match-set", &info->match_set);
}
static struct xtables_match set_mt_reg[] = {
{
.name = "set",
.revision = 0,
.version = XTABLES_VERSION,
.family = NFPROTO_IPV4,
.size = XT_ALIGN(sizeof(struct xt_set_info_match_v0)),
.userspacesize = XT_ALIGN(sizeof(struct xt_set_info_match_v0)),
.help = set_help_v0,
.parse = set_parse_v0,
.final_check = set_check_v0,
.print = set_print_v0,
.save = set_save_v0,
.extra_opts = set_opts_v0,
},
{
.name = "set",
.revision = 1,
.version = XTABLES_VERSION,
.family = NFPROTO_UNSPEC,
.size = XT_ALIGN(sizeof(struct xt_set_info_match_v1)),
.userspacesize = XT_ALIGN(sizeof(struct xt_set_info_match_v1)),
.help = set_help_v1,
.parse = set_parse_v1,
.final_check = set_check_v1,
.print = set_print_v1,
.save = set_save_v1,
.extra_opts = set_opts_v1,
},
};
void _init(void)
{
xtables_register_matches(set_mt_reg, ARRAY_SIZE(set_mt_reg));
}
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