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/*
Shared library add-on to iptables to add layer 7 matching support.
http://l7-filter.sf.net
By Matthew Strait <quadong@users.sf.net>, Dec 2003.
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.
http://www.gnu.org/licenses/gpl.txt
*/
#define _GNU_SOURCE
#include <stdio.h>
#include <netdb.h>
#include <string.h>
#include <stdlib.h>
#include <getopt.h>
#include <ctype.h>
#include <dirent.h>
#include <iptables.h>
#include <linux/netfilter_ipv4/ipt_childlevel.h>
/* Function which prints out usage message. */
static void help(void)
{
printf(
"CHILDLEVEL match v%s options:\n"
"--level <n> : Match childlevel n (0 == master)\n",
IPTABLES_VERSION);
fputc('\n', stdout);
}
static struct option opts[] = {
{ .name = "level", .has_arg = 1, .flag = 0, .val = '1' },
{ .name = 0 }
};
/* Initialize the match. */
static void init(struct ipt_entry_match *m, unsigned int *nfcache)
{
*nfcache |= NFC_UNKNOWN;
}
/* Function which parses command options; returns true if it ate an option */
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_childlevel_info *childlevelinfo =
(struct ipt_childlevel_info *)(*match)->data;
switch (c) {
case '1':
check_inverse(optarg, &invert, &optind, 0);
childlevelinfo->childlevel = atoi(argv[optind-1]);
if (invert)
childlevelinfo->invert = 1;
*flags = 1;
break;
default:
return 0;
}
return 1;
}
/* Final check; must have specified --level. */
static void final_check(unsigned int flags)
{
if (!flags)
exit_error(PARAMETER_PROBLEM,
"CHILDLEVEL match: You must specify `--level'");
}
static void print_protocol(int n, int invert, int numeric)
{
fputs("childlevel ", stdout);
if (invert) fputc('!', stdout);
printf("%d ", n);
}
/* Prints out the matchinfo. */
static void print(const struct ipt_ip *ip,
const struct ipt_entry_match *match,
int numeric)
{
printf("CHILDLEVEL ");
print_protocol(((struct ipt_childlevel_info *)match->data)->childlevel,
((struct ipt_childlevel_info *)match->data)->invert, numeric);
}
/* Saves the union ipt_matchinfo in parsable form to stdout. */
static void save(const struct ipt_ip *ip, const struct ipt_entry_match *match)
{
const struct ipt_childlevel_info *info =
(const struct ipt_childlevel_info*) match->data;
printf("--childlevel %s%d ", (info->invert) ? "! ": "", info->childlevel);
}
static struct iptables_match childlevel = {
.name = "childlevel",
.version = IPTABLES_VERSION,
.size = IPT_ALIGN(sizeof(struct ipt_childlevel_info)),
.userspacesize = IPT_ALIGN(sizeof(struct ipt_childlevel_info)),
.help = &help,
.init = &init,
.parse = &parse,
.final_check = &final_check,
.print = &print,
.save = &save,
.extra_opts = opts
};
void _init(void)
{
register_match(&childlevel);
}
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