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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 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 "libipt_set.h"
/* Function which prints out usage message. */
static void help(void)
{
printf("SET v%s options:\n"
" --add-set name flags\n"
" --del-set name 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.index =
info->del_set.index = IP_SET_INVALID_ID;
/* Can't cache this */
*nfcache |= NFC_UNKNOWN;
}
static void
parse_target(char **argv, int invert, unsigned int *flags,
struct ipt_set_info *info, const char *what)
{
if (info->flags[0])
exit_error(PARAMETER_PROBLEM,
"--%s can be specified only once", what);
if (check_inverse(optarg, &invert, NULL, 0))
exit_error(PARAMETER_PROBLEM,
"Unexpected `!' after --%s", what);
if (!argv[optind]
|| argv[optind][0] == '-' || argv[optind][0] == '!')
exit_error(PARAMETER_PROBLEM,
"--%s requires two args.", what);
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);
optind++;
*flags = 1;
}
/* 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;
switch (c) {
case '1': /* --add-set <set> <flags> */
parse_target(argv, invert, flags,
&myinfo->add_set, "add-set");
break;
case '2': /* --del-set <set>[:<flags>] <flags> */
parse_target(argv, invert, flags,
&myinfo->del_set, "del-set");
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];
get_set_byid(setname, info->index);
printf("%s %s", 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 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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