mirror of
git://git.code.sf.net/p/xtables-addons/xtables-addons
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114 lines
3.0 KiB
C
114 lines
3.0 KiB
C
/*
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* LSCAN match extension for iptables
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* Copyright © Jan Engelhardt, 2006 - 2009
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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 <string.h>
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#include <stdlib.h>
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#include <getopt.h>
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#include <xtables.h>
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#include <linux/netfilter/x_tables.h>
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#include "xt_lscan.h"
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#include "compat_user.h"
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static const struct option lscan_mt_opts[] = {
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{.name = "stealth", .has_arg = false, .val = 'x'},
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{.name = "synscan", .has_arg = false, .val = 's'},
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{.name = "cnscan", .has_arg = false, .val = 'c'},
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{.name = "grscan", .has_arg = false, .val = 'g'},
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{.name = "mirai", .has_arg = false, .val = 'm'},
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{NULL},
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};
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static void lscan_mt_help(void)
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{
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printf(
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"lscan match options:\n"
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"(Combining them will make them match by OR-logic)\n"
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" --stealth Match TCP Stealth packets\n"
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" --synscan Match TCP SYN scans\n"
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" --cnscan Match TCP Connect scans\n"
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" --grscan Match Banner Grabbing scans\n"
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" --mirai Match TCP scan with ISN = dest. IP\n");
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}
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static int lscan_mt_parse(int c, char **argv, int invert,
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unsigned int *flags, const void *entry, struct xt_entry_match **match)
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{
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struct xt_lscan_mtinfo *info = (void *)((*match)->data);
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switch (c) {
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case 'c':
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info->match_fl3 |= LSCAN_FL3_CN;
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return true;
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case 'g':
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info->match_fl4 |= LSCAN_FL4_GR;
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return true;
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case 'm':
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info->match_fl1 |= LSCAN_FL1_MIRAI;
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return true;
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case 's':
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info->match_fl2 |= LSCAN_FL2_SYN;
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return true;
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case 'x':
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info->match_fl1 |= LSCAN_FL1_STEALTH;
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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 lscan_mt_check(unsigned int flags)
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{
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}
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static void lscan_mt_save(const void *ip, const struct xt_entry_match *match)
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{
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const struct xt_lscan_mtinfo *info = (const void *)(match->data);
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if (info->match_fl1 & LSCAN_FL1_STEALTH)
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printf(" --stealth ");
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if (info->match_fl2 & LSCAN_FL2_SYN)
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printf(" --synscan ");
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if (info->match_fl3 & LSCAN_FL3_CN)
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printf(" --cnscan ");
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if (info->match_fl4 & LSCAN_FL4_GR)
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printf(" --grscan ");
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if (info->match_fl1 & LSCAN_FL1_MIRAI)
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printf(" --mirai ");
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}
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static void lscan_mt_print(const void *ip,
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const struct xt_entry_match *match, int numeric)
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{
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printf(" -m lscan");
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lscan_mt_save(ip, match);
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}
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static struct xtables_match lscan_mt_reg = {
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.version = XTABLES_VERSION,
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.name = "lscan",
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.revision = 0,
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.family = NFPROTO_IPV4,
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.size = XT_ALIGN(sizeof(struct xt_lscan_mtinfo)),
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.userspacesize = XT_ALIGN(sizeof(struct xt_lscan_mtinfo)),
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.help = lscan_mt_help,
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.parse = lscan_mt_parse,
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.final_check = lscan_mt_check,
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.print = lscan_mt_print,
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.save = lscan_mt_save,
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.extra_opts = lscan_mt_opts,
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};
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static __attribute__((constructor)) void lscan_mt_ldr(void)
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{
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xtables_register_match(&lscan_mt_reg);
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}
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