103 lines
2.1 KiB
C
103 lines
2.1 KiB
C
#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 foo");
|
|
}
|
|
|
|
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);
|
|
}
|