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/*
* "fuzzy" match extension for iptables
* Hime Aguiar e Oliveira Jr. <hime@engineer.com>, 2002 - 2003
*
* 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 <netdb.h>
#include <stddef.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <xtables.h>
#include "xt_fuzzy.h"
#include "compat_user.h"
static void fuzzy_mt_help(void)
{
printf(
"fuzzy match options:\n"
" --lower-limit number (in packets per second)\n"
" --upper-limit number\n");
};
static const struct option fuzzy_mt_opts[] = {
{.name = "lower-limit", .has_arg = true, .val = '1'},
{.name = "upper-limit", .has_arg = true, .val = '2'},
{NULL},
};
/* Initialize data structures */
static void fuzzy_mt_init(struct xt_entry_match *m)
{
struct xt_fuzzy_mtinfo *info = (void *)m->data;
/*
* Default rates (I will improve this very soon with something based
* on real statistics of the running machine).
*/
info->minimum_rate = 1000;
info->maximum_rate = 2000;
}
#define IPT_FUZZY_OPT_MINIMUM 0x01
#define IPT_FUZZY_OPT_MAXIMUM 0x02
static int fuzzy_mt_parse(int c, char **argv, int invert, unsigned int *flags,
const void *entry, struct xt_entry_match **match)
{
struct xt_fuzzy_mtinfo *info = (void *)(*match)->data;
uint32_t num;
switch (c) {
case '1':
if (invert)
xtables_error(PARAMETER_PROBLEM,"Can't specify ! --lower-limit");
if (*flags & IPT_FUZZY_OPT_MINIMUM)
xtables_error(PARAMETER_PROBLEM,"Can't specify --lower-limit twice");
if (!xtables_strtoui(optarg, NULL, &num, 1, FUZZY_MAX_RATE) || num < 1)
xtables_error(PARAMETER_PROBLEM,"BAD --lower-limit");
info->minimum_rate = num;
*flags |= IPT_FUZZY_OPT_MINIMUM;
return true;
case '2':
if (invert)
xtables_error(PARAMETER_PROBLEM,"Can't specify ! --upper-limit");
if (*flags & IPT_FUZZY_OPT_MAXIMUM)
xtables_error(PARAMETER_PROBLEM,"Can't specify --upper-limit twice");
if (!xtables_strtoui(optarg, NULL, &num, 1, FUZZY_MAX_RATE) || num < 1)
xtables_error(PARAMETER_PROBLEM,"BAD --upper-limit");
info->maximum_rate = num;
*flags |= IPT_FUZZY_OPT_MAXIMUM;
return true;
}
return false;
}
static void fuzzy_mt_check(unsigned int flags)
{
}
static void fuzzy_mt_save(const void *ip, const struct xt_entry_match *match)
{
const struct xt_fuzzy_mtinfo *info = (const void *)match->data;
printf(" --lower-limit %u ", info->minimum_rate);
printf(" --upper-limit %u ", info->maximum_rate);
}
static void fuzzy_mt_print(const void *ip, const struct xt_entry_match *match,
int numeric)
{
printf(" -m fuzzy");
fuzzy_mt_save(ip, match);
}
static struct xtables_match fuzzy_mt_reg = {
.name = "fuzzy",
.revision = 1,
.version = XTABLES_VERSION,
.family = NFPROTO_UNSPEC,
.size = XT_ALIGN(sizeof(struct xt_fuzzy_mtinfo)),
.userspacesize = offsetof(struct xt_fuzzy_mtinfo, packets_total),
.help = fuzzy_mt_help,
.init = fuzzy_mt_init,
.parse = fuzzy_mt_parse,
.final_check = fuzzy_mt_check,
.print = fuzzy_mt_print,
.save = fuzzy_mt_save,
.extra_opts = fuzzy_mt_opts,
};
static __attribute__((constructor)) void fuzzy_mt_ldr(void)
{
xtables_register_match(&fuzzy_mt_reg);
}
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