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libxt_CHAOS.c    114 lines (100 with data), 2.8 kB

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/*
* "CHAOS" target extension for iptables
* Copyright Š Jan Engelhardt, 2006 - 2008
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License; either
* version 2 of the License, or any later version, as published by the
* Free Software Foundation.
*/
#include <getopt.h>
#include <stdbool.h>
#include <stdint.h>
#include <stdio.h>
#include <string.h>
#include <xtables.h>
#include <linux/netfilter/x_tables.h>
#include "xt_CHAOS.h"
#include "compat_user.h"
enum {
F_DELUDE = 1 << 0,
F_TARPIT = 1 << 1,
};
static const struct option chaos_tg_opts[] = {
{.name = "delude", .has_arg = false, .val = 'd'},
{.name = "tarpit", .has_arg = false, .val = 't'},
{NULL},
};
static void chaos_tg_help(void)
{
printf(
"CHAOS target options:\n"
" --delude Enable DELUDE processing for TCP\n"
" --tarpit Enable TARPIT processing for TCP\n");
}
static int chaos_tg_parse(int c, char **argv, int invert, unsigned int *flags,
const void *entry, struct xt_entry_target **target)
{
struct xt_chaos_tginfo *info = (void *)((*target)->data);
switch (c) {
case 'd':
info->variant = XTCHAOS_DELUDE;
*flags |= F_DELUDE;
return true;
case 't':
info->variant = XTCHAOS_TARPIT;
*flags |= F_TARPIT;
return true;
}
return false;
}
static void chaos_tg_check(unsigned int flags)
{
if (flags == (F_DELUDE | F_TARPIT))
/* If flags == 0x03, both were specified, which should not be. */
xtables_error(PARAMETER_PROBLEM,
"CHAOS: only one of --tarpit or --delude "
"may be specified");
}
static void chaos_tg_print(const void *ip,
const struct xt_entry_target *target, int numeric)
{
const struct xt_chaos_tginfo *info = (const void *)target->data;
switch (info->variant) {
case XTCHAOS_DELUDE:
printf(" DELUDE ");
break;
case XTCHAOS_TARPIT:
printf(" TARPIT ");
break;
}
}
static void chaos_tg_save(const void *ip, const struct xt_entry_target *target)
{
const struct xt_chaos_tginfo *info = (const void *)target->data;
switch (info->variant) {
case XTCHAOS_DELUDE:
printf(" --delude ");
break;
case XTCHAOS_TARPIT:
printf(" --tarpit ");
break;
}
}
static struct xtables_target chaos_tg_reg = {
.version = XTABLES_VERSION,
.name = "CHAOS",
.family = NFPROTO_IPV4,
.size = XT_ALIGN(sizeof(struct xt_chaos_tginfo)),
.userspacesize = XT_ALIGN(sizeof(struct xt_chaos_tginfo)),
.help = chaos_tg_help,
.parse = chaos_tg_parse,
.final_check = chaos_tg_check,
.print = chaos_tg_print,
.save = chaos_tg_save,
.extra_opts = chaos_tg_opts,
};
static __attribute__((constructor)) void chaos_tg_ldr(void)
{
xtables_register_target(&chaos_tg_reg);
}