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/* Shared library add-on to iptables to add IP address set matching. */
#include <stdio.h>
#include <netdb.h>
#include <string.h>
#include <stdlib.h>
#include <getopt.h>
#include <ctype.h>
#include <errno.h>
#include <iptables.h>
#include <linux/netfilter_ipv4/ip_conntrack.h>
#include <linux/netfilter_ipv4/ipt_set.h>
#include "../ipset/libipt_set.h"
/* Function which prints out usage message. */
static void help(void)
{
printf("set v%s options:\n"
" [!] --set name[:flags] flags\n"
" 'name' is the set name from to match.\n"
" 'flags' are the comma separated list of\n"
" 'src' and 'dst'.\n"
"\n", IPTABLES_VERSION);
}
static struct option opts[] = {
{"set", 1, 0, '1'},
{0}
};
/* Initialize the match. */
static void init(struct ipt_entry_match *match, unsigned int *nfcache)
{
struct ipt_set_info_match *info =
(struct ipt_set_info_match *) match->data;
memset(info, 0, sizeof(struct ipt_set_info_match));
info->match.id = -1;
/* 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_set_info_match *myinfo =
(struct ipt_set_info_match *) (*match)->data;
struct ipt_set_info *info = &myinfo->match;
switch (c) {
case '1': /* --set <set>[:<flags>] <flags> */
check_inverse(optarg, &invert, &optind, 0);
if (invert)
info->flags[0] |= IPSET_MATCH_INV;
if (!argv[optind]
|| argv[optind][0] == '-' || argv[optind][0] == '!')
exit_error(PARAMETER_PROBLEM,
"--set requires two args.");
parse_pool(argv[optind - 1], info);
if (parse_ipflags(argv[optind++], info))
exit_error(PARAMETER_PROBLEM,
"Can't use overwrite flag with --set.");
*flags = 1;
break;
default:
return 0;
}
return 1;
}
/* Final check; must have specified --set. */
static void final_check(unsigned int flags)
{
if (!flags)
exit_error(PARAMETER_PROBLEM,
"You must specify either `--set'");
}
static void
print_match(const char *prefix, const struct ipt_set_info *info)
{
int i;
char setname[IP_SET_MAXNAMELEN];
if (info->id >= 0) {
get_set_byid(setname, info->id);
printf("%s%s %s",
(info->flags[0] & IPSET_MATCH_INV) ? "!" : "",
prefix,
setname);
for (i = 0; i < info->set_level; i++)
printf("%s%s",
i == 0 ? ":" : ",",
info->flags[i] & IPSET_SRC ? "src" : "dst");
for (i = info->set_level; i < info->ip_level; i++)
printf("%s%s",
i == info->set_level ? " " : ",",
info->flags[i] & IPSET_SRC ? "src" : "dst");
printf(" ");
}
}
/* Prints out the matchinfo. */
static void
print(const struct ipt_ip *ip,
const struct ipt_entry_match *match, int numeric)
{
struct ipt_set_info_match *info =
(struct ipt_set_info_match *) match->data;
print_match("set", &info->match);
}
/* Saves the matchinfo in parsable form to stdout. */
static void save(const struct ipt_ip *ip,
const struct ipt_entry_match *match)
{
struct ipt_set_info_match *info =
(struct ipt_set_info_match *) match->data;
print_match("--set", &info->match);
}
static
struct iptables_match set = { NULL,
.name = "set",
.version = IPTABLES_VERSION,
.size = IPT_ALIGN(sizeof(struct ipt_set_info_match)),
.userspacesize = IPT_ALIGN(sizeof(struct ipt_set_info_match)),
.help = &help,
.init = &init,
.parse = &parse,
.final_check = &final_check,
.print = &print,
.save = &save,
.extra_opts = opts
};
void _init(void)
{
register_match(&set);
}
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