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