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/* Shared library add-on to iptables to add IP address pool matching. */
#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/ip_conntrack.h>
#include <linux/netfilter_ipv4/ipt_pool.h>
#include <libippool/ip_pool_support.h>
/* FIXME --RR */
#include "../ippool/libippool.c"
/* Function which prints out usage message. */
static void
help(void)
{
printf(
"pool v%s options:\n"
" [!] --srcpool NAME|INDEX\n"
" [!] --dstpool NAME|INDEX\n"
" Pool index (or name from %s) to match\n"
"\n", NETFILTER_VERSION, IPPOOL_CONF);
}
static struct option opts[] = {
{ "srcpool", 1, 0, '1' },
{ "dstpool", 1, 0, '2' },
{0}
};
/* Initialize the match. */
static void
init(struct ipt_entry_match *match, unsigned int *nfcache)
{
struct ipt_pool_info *info =
(struct ipt_pool_info *)match->data;
info->src = IP_POOL_NONE;
info->dst = IP_POOL_NONE;
info->flags = 0;
/* Can't cache this - XXX */
*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_pool_info *info =
(struct ipt_pool_info *)(*match)->data;
switch (c) {
case '1':
if (check_inverse(optarg, &invert)) optind++;
info->src = ip_pool_get_index(argv[optind-1]);
if (invert) info->flags |= IPT_POOL_INV_SRC;
*flags = 1;
break;
case '2':
if (check_inverse(optarg, &invert)) optind++;
info->dst = ip_pool_get_index(argv[optind-1]);
if (invert) info->flags |= IPT_POOL_INV_DST;
*flags = 1;
break;
default:
return 0;
}
return 1;
}
/* Final check; must have specified --srcpool or --dstpool. */
static void final_check(unsigned int flags)
{
if (!flags)
exit_error(PARAMETER_PROBLEM, "You must specify either `--srcpool or --dstpool'");
}
/* Prints out the matchinfo. */
static void
print(const struct ipt_ip *ip,
const struct ipt_entry_match *match,
int numeric)
{
char buf[256];
struct ipt_pool_info *info =
(struct ipt_pool_info *)match->data;
if (info->src != IP_POOL_NONE)
printf("%ssrcpool %s ",
(info->flags & IPT_POOL_INV_SRC) ? "!" : "",
ip_pool_get_name(buf, sizeof(buf), info->src, 0));
if (info->dst != IP_POOL_NONE)
printf("%sdstpool %s ",
(info->flags & IPT_POOL_INV_DST) ? "!" : "",
ip_pool_get_name(buf, sizeof(buf), info->dst, 0));
}
/* Saves the matchinfo in parsable form to stdout. */
static void save(const struct ipt_ip *ip, const struct ipt_entry_match *match)
{
char buf[256];
struct ipt_pool_info *info =
(struct ipt_pool_info *)match->data;
if (info->src != IP_POOL_NONE)
printf("%s--srcpool %s",
(info->flags & IPT_POOL_INV_SRC) ? "! " : "",
ip_pool_get_name(buf, sizeof(buf), info->src, 0));
if (info->dst != IP_POOL_NONE)
printf("%s--dstpool %s",
(info->flags & IPT_POOL_INV_DST) ? "! " : "",
ip_pool_get_name(buf, sizeof(buf), info->dst, 0));
}
static
struct iptables_match pool
= { NULL,
"pool",
NETFILTER_VERSION,
IPT_ALIGN(sizeof(struct ipt_pool_info)),
IPT_ALIGN(sizeof(struct ipt_pool_info)),
&help,
&init,
&parse,
&final_check,
&print,
&save,
opts
};
void _init(void)
{
register_match(&pool);
}
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