mirror of
git://git.code.sf.net/p/xtables-addons/xtables-addons
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102 lines
2.5 KiB
C
102 lines
2.5 KiB
C
/*
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* "dhcpmac" match extension for iptables
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* Copyright © Jan Engelhardt, 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 <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <netdb.h>
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#include <net/ethernet.h>
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#include <xtables.h>
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#include "xt_DHCPMAC.h"
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#include "mac.c"
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#include "compat_user.h"
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enum {
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F_MAC = 1 << 0,
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};
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static const struct option dhcpmac_mt_opts[] = {
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{.name = "mac", .has_arg = true, .val = 'M'},
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{NULL},
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};
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static void dhcpmac_mt_help(void)
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{
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printf(
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"dhcpmac match options:\n"
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"[!] --mac lladdr[/mask] Match on MAC address in DHCP Client Host field\n"
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);
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}
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static int dhcpmac_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 dhcpmac_info *info = (void *)(*match)->data;
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switch (c) {
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case 'M':
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xtables_param_act(XTF_ONLY_ONCE, "dhcpmac", "--mac", *flags & F_MAC);
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xtables_param_act(XTF_NO_INVERT, "dhcpmac", "--mac", invert);
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if (!mac_parse(optarg, info->addr, &info->mask))
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xtables_param_act(XTF_BAD_VALUE, "dhcpmac", "--mac", optarg);
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if (invert)
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info->invert = true;
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*flags |= F_MAC;
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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 dhcpmac_mt_check(unsigned int flags)
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{
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if (flags == 0)
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xtables_error(PARAMETER_PROBLEM, "dhcpmac match: "
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"--mac parameter required");
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}
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static void dhcpmac_mt_save(const void *ip,
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const struct xt_entry_match *match)
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{
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const struct dhcpmac_info *info = (void *)match->data;
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if (info->invert)
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printf(" !");
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printf(" --mac " DH_MAC_FMT "/%u ",
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DH_MAC_HEX(info->addr), info->mask);
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}
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static void dhcpmac_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 dhcpmac");
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dhcpmac_mt_save(ip, match);
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}
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static struct xtables_match dhcpmac_mt_reg = {
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.version = XTABLES_VERSION,
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.name = "dhcpmac",
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.revision = 0,
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.family = NFPROTO_IPV4,
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.size = XT_ALIGN(sizeof(struct dhcpmac_info)),
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.userspacesize = XT_ALIGN(sizeof(struct dhcpmac_info)),
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.help = dhcpmac_mt_help,
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.parse = dhcpmac_mt_parse,
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.final_check = dhcpmac_mt_check,
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.print = dhcpmac_mt_print,
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.save = dhcpmac_mt_save,
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.extra_opts = dhcpmac_mt_opts,
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};
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static __attribute__((constructor)) void dhcpmac_mt_ldr(void)
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{
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xtables_register_match(&dhcpmac_mt_reg);
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}
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