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/*
* libipt_osf.c
*
* Copyright (c) 2003 Evgeniy Polyakov <johnpol@2ka.mipt.ru>
*
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
/*
* iptables interface for OS fingerprint matching module.
*/
#include <stdio.h>
#include <netdb.h>
#include <string.h>
#include <stdlib.h>
#include <getopt.h>
#include <ctype.h>
#include <iptables.h>
#include <linux/netfilter_ipv4/ipt_osf.h>
static void help(void)
{
printf("OS fingerprint match v%s options:\n"
" --genre [!] string Match a OS genre bypassive fingerprinting.\n"
" Genres: Linux, FreeBSD, NetBSD, OpenBSD,\n"
" Windows\n",
IPTABLES_VERSION);
}
static struct option opts[] = {
{ .name = "genre", .has_arg = 1, .flag = 0, .val = '1' },
{ .name = 0 }
};
static void init(struct ipt_entry_match *m, unsigned int *nfcache)
{
*nfcache |= NFC_UNKNOWN;
}
static void parse_string(const unsigned char *s, struct ipt_osf_info *info)
{
if (strlen(s) < MAXGENRELEN)
strcpy(info->genre, s);
else
exit_error(PARAMETER_PROBLEM, "Genre string too long `%s' [%d], max=%d",
s, strlen(s), MAXGENRELEN);
}
static int parse(int c, char **argv, int invert, unsigned int *flags,
const struct ipt_entry *entry,
unsigned int *nfcache,
struct ipt_entry_match **match)
{
struct ipt_osf_info *info = (struct ipt_osf_info *)(*match)->data;
if (*flags)
exit_error(PARAMETER_PROBLEM, "Can't specify multiple strings");
check_inverse(optarg, &invert, &optind, 0);
parse_string(optarg, info);
if (invert)
info->invert = 1;
info->len=strlen((char *)info->genre);
*flags = 1;
return 1;
}
static void final_check(unsigned int flags)
{
if (!flags)
exit_error(PARAMETER_PROBLEM, "OS fingerprint match: You must specify `--genre'");
}
static void print(const struct ipt_ip *ip, const struct ipt_entry_match *match, int numeric)
{
const struct ipt_osf_info *info = (const struct ipt_osf_info*) match->data;
printf("OS fingerprint match %s%s ", (info->invert) ? "!" : "", info->genre);
}
static void save(const struct ipt_ip *ip, const struct ipt_entry_match *match)
{
const struct ipt_osf_info *info = (const struct ipt_osf_info*) match->data;
printf("--genre %s%s ", (info->invert) ? "! ": "", info->genre);
}
static struct iptables_match osf_match = {
.name = "osf",
.version = IPTABLES_VERSION,
.size = IPT_ALIGN(sizeof(struct ipt_osf_info)),
.userspacesize = IPT_ALIGN(sizeof(struct ipt_osf_info)),
.help = &help,
.init = &init,
.parse = &parse,
.final_check = &final_check,
.print = &print,
.save = &save,
.extra_opts = opts
};
void _init(void)
{
register_match(&osf_match);
}
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