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git://git.code.sf.net/p/xtables-addons/xtables-addons
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fa1348455d
Honeypot mode attempts to maintain a normal connection for the purpose of capturing payload packets. Reset mode provides the ability to send a reset packet in lieu of using the DROP or REJECT targets.
124 lines
2.9 KiB
C
124 lines
2.9 KiB
C
/*
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* "TARPIT" target extension to iptables
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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 <stdbool.h>
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#include <stdint.h>
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#include <stdio.h>
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#include <getopt.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_TARPIT.h"
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#include "compat_user.h"
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enum {
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F_TARPIT = 1 << 0,
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F_HONEYPOT = 1 << 1,
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F_RESET = 1 << 2,
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};
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static const struct option tarpit_tg_opts[] = {
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{.name = "tarpit", .has_arg = false, .val = 't'},
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{.name = "honeypot", .has_arg = false, .val = 'h'},
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{.name = "reset", .has_arg = false, .val = 'r'},
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{NULL},
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};
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static void tarpit_tg_help(void)
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{
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printf(
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"TARPIT target options:\n"
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" --tarpit Enable classic 0-window tarpit (default)\n"
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" --honeypot Enable honeypot option\n"
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" --reset Enable inline resets\n");
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}
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static int tarpit_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_tarpit_tginfo *info = (void *)(*target)->data;
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switch (c) {
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case 't':
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info->variant = XTTARPIT_TARPIT;
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*flags |= F_TARPIT;
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return true;
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case 'h':
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info->variant = XTTARPIT_HONEYPOT;
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*flags |= F_HONEYPOT;
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return true;
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case 'r':
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info->variant = XTTARPIT_RESET;
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*flags |= F_RESET;
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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 tarpit_tg_check(unsigned int flags)
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{
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if (flags == (F_TARPIT | F_HONEYPOT | F_RESET))
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xtables_error(PARAMETER_PROBLEM,
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"TARPIT: only one action can be used at a time");
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}
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static void tarpit_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_tarpit_tginfo *info = (void *)target->data;
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switch (info->variant) {
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case XTTARPIT_HONEYPOT:
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printf(" honeypot mode ");
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break;
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case XTTARPIT_RESET:
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printf(" reset mode ");
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break;
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default:
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printf(" tarpit mode ");
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break;
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}
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}
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static void tarpit_tg_save(const void *ip,
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const struct xt_entry_target *target)
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{
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const struct xt_tarpit_tginfo *info = (const void *)target->data;
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switch (info->variant) {
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case XTTARPIT_TARPIT:
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printf(" --tarpit ");
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break;
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case XTTARPIT_HONEYPOT:
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printf(" --honeypot ");
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break;
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case XTTARPIT_RESET:
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printf(" --reset ");
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break;
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}
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}
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static struct xtables_target tarpit_tg_reg = {
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.version = XTABLES_VERSION,
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.name = "TARPIT",
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.family = NFPROTO_IPV4,
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.size = XT_ALIGN(sizeof(struct xt_tarpit_tginfo)),
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.userspacesize = XT_ALIGN(sizeof(struct xt_tarpit_tginfo)),
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.help = tarpit_tg_help,
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.parse = tarpit_tg_parse,
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.final_check = tarpit_tg_check,
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.print = tarpit_tg_print,
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.save = tarpit_tg_save,
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.extra_opts = tarpit_tg_opts,
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};
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static __attribute__((constructor)) void tarpit_tg_ldr(void)
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{
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xtables_register_target(&tarpit_tg_reg);
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}
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