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#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <getopt.h>
#include <linux/netfilter_ipv4/ip_tables.h>
#include <linux/netfilter_ipv4/ipt_workshop.h>
static void help(void)
{
printf(
"workshop match v%s options:\n"
" --ttl TTL value\n"
, IPTABLES_VERSION);
}
static void init(struct ipt_entry_match *m, unsigned int *nfcache)
{
/* caching not implemented yet */
*nfcache |= NFC_UNKNOWN;
}
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_ws_info *info = (struct ipt_ws_info *) (*match)->data;
check_inverse(optarg, &invert, &optind, 0);
if (invert)
exit_error(PARAMETER_PROBLEM, "invert not supported");
if (*flags)
exit_error(PARAMETER_PROBLEM,
"workshop: can't specify parameter twice");
if (!optarg)
exit_error(PARAMETER_PROBLEM,
"workshop: you must specify a value");
switch (c) {
case 'z':
info->ttl = atoi(optarg);
/* FIXME: range 0-255 */
*flags = 1;
break;
default:
return 0;
}
return 1;
}
static void final_check(unsigned int flags)
{
if (!flags)
exit_error(PARAMETER_PROBLEM,
"workshop match: you must specify ttl");
}
static void print(const struct ipt_ip *ip,
const struct ipt_entry_match *match,
int numeric)
{
const struct ipt_ws_info *info = (struct ipt_ws_info *) match->data;
printf("workshop match TTL=%u ", info->ttl);
}
static void save(const struct ipt_ip *ip,
const struct ipt_entry_match *match)
{
const struct ipt_ws_info *info = (struct ipt_ws_info *) match->data;
printf("--ttl %u ", info->ttl);
}
static struct option opts[] = {
{ "ttl", 1, 0, 'z' },
{ 0 }
};
static struct iptables_match ws = {
.next = NULL,
.name = "workshop",
.version = IPTABLES_VERSION,
.size = IPT_ALIGN(sizeof(struct ipt_ws_info)),
.userspacesize = IPT_ALIGN(sizeof(struct ipt_ws_info)),
.help = &help,
.init = &init,
.parse = &parse,
.final_check = &final_check,
.print = &print,
.save = &save,
.extra_opts = opts
};
void _init(void)
{
register_match(&ws);
}
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