mirror of
git://git.code.sf.net/p/xtables-addons/xtables-addons
synced 2025-09-06 20:55:13 +02:00
102 lines
2.7 KiB
C
102 lines
2.7 KiB
C
/*
|
|
* "DHCPMAC" target extension for iptables
|
|
* Copyright © Jan Engelhardt <jengelh [at] medozas de>, 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 <stdlib.h>
|
|
#include <string.h>
|
|
#include <netinet/ether.h>
|
|
#include <xtables.h>
|
|
#include "xt_DHCPMAC.h"
|
|
#include "mac.c"
|
|
|
|
enum {
|
|
F_MAC = 1 << 0,
|
|
};
|
|
|
|
static const struct option dhcpmac_tg_opts[] = {
|
|
{.name = "set-mac", .has_arg = true, .val = 'M'},
|
|
{NULL},
|
|
};
|
|
|
|
static void dhcpmac_tg_help(void)
|
|
{
|
|
printf(
|
|
"DHCPMAC target options:\n"
|
|
" --set-mac lladdr[/mask] Set MAC address in DHCP Client Host field\n"
|
|
);
|
|
}
|
|
|
|
static int dhcpmac_tg_parse(int c, char **argv, int invert,
|
|
unsigned int *flags, const void *entry, struct xt_entry_target **target)
|
|
{
|
|
struct dhcpmac_info *info = (void *)(*target)->data;
|
|
|
|
switch (c) {
|
|
case 'M':
|
|
xtables_param_act(XTF_ONLY_ONCE, "DHCPMAC", "--set-mac", *flags & F_MAC);
|
|
xtables_param_act(XTF_NO_INVERT, "DHCPMAC", "--set-mac", invert);
|
|
if (!mac_parse(optarg, info->addr, &info->mask))
|
|
xtables_param_act(XTF_BAD_VALUE, "DHCPMAC", "--set-mac", optarg);
|
|
*flags |= F_MAC;
|
|
return true;
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
static void dhcpmac_tg_check(unsigned int flags)
|
|
{
|
|
if (flags == 0)
|
|
xtables_error(PARAMETER_PROBLEM, "DHCPMAC target: "
|
|
"--set-mac parameter required");
|
|
}
|
|
|
|
static void dhcpmac_tg_print(const void *ip,
|
|
const struct xt_entry_target *target, int numeric)
|
|
{
|
|
const struct dhcpmac_info *info = (void *)target->data;
|
|
|
|
printf("DHCPMAC %s" DH_MAC_FMT "/%u ",
|
|
info->invert ? "!" : "", DH_MAC_HEX(info->addr), info->mask);
|
|
}
|
|
|
|
static void dhcpmac_tg_save(const void *ip,
|
|
const struct xt_entry_target *target)
|
|
{
|
|
const struct dhcpmac_info *info = (const void *)target->data;
|
|
|
|
if (info->invert)
|
|
printf("! ");
|
|
printf("--set-mac " DH_MAC_FMT "/%u ",
|
|
DH_MAC_HEX(info->addr), info->mask);
|
|
}
|
|
|
|
static struct xtables_target dhcpmac_tg_reg = {
|
|
.version = XTABLES_VERSION,
|
|
.name = "DHCPMAC",
|
|
.revision = 0,
|
|
.family = NFPROTO_IPV4,
|
|
.size = XT_ALIGN(sizeof(struct dhcpmac_info)),
|
|
.userspacesize = XT_ALIGN(sizeof(struct dhcpmac_info)),
|
|
.help = dhcpmac_tg_help,
|
|
.parse = dhcpmac_tg_parse,
|
|
.final_check = dhcpmac_tg_check,
|
|
.print = dhcpmac_tg_print,
|
|
.save = dhcpmac_tg_save,
|
|
.extra_opts = dhcpmac_tg_opts,
|
|
};
|
|
|
|
static __attribute__((constructor)) void dhcpmac_tg_ldr(void)
|
|
{
|
|
xtables_register_target(&dhcpmac_tg_reg);
|
|
}
|