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/* Shared library add-on to iptables for condition match */
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <getopt.h>
#include <iptables.h>
#include<linux/netfilter_ipv4/ip_tables.h>
#include<linux/netfilter_ipv4/ipt_condition.h>
static void
help(void)
{
printf("condition match v%s options:\n"
"--condition [!] filename "
"Match on boolean value stored in /proc file\n",
IPTABLES_VERSION);
}
static struct option opts[] = {
{ .name = "condition", .has_arg = 1, .flag = 0, .val = 'X' },
{ .name = 0 }
};
static void
init(struct ipt_entry_match *m, unsigned int *nfcache)
{
*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 condition_info *info =
(struct condition_info *) (*match)->data;
if (c == 'X') {
if (*flags)
exit_error(PARAMETER_PROBLEM,
"Can't specify multiple conditions");
check_inverse(optarg, &invert, &optind, 0);
if (strlen(argv[optind - 1]) < CONDITION_NAME_LEN)
strcpy(info->name, argv[optind - 1]);
else
exit_error(PARAMETER_PROBLEM,
"File name too long");
info->invert = invert;
*flags = 1;
return 1;
}
return 0;
}
static void
final_check(unsigned int flags)
{
if (!flags)
exit_error(PARAMETER_PROBLEM,
"Condition match: must specify --condition");
}
static void
print(const struct ipt_ip *ip,
const struct ipt_entry_match *match, int numeric)
{
const struct condition_info *info =
(const struct condition_info *) match->data;
printf("condition %s%s ", (info->invert) ? "!" : "", info->name);
}
static void
save(const struct ipt_ip *ip,
const struct ipt_entry_match *match)
{
const struct condition_info *info =
(const struct condition_info *) match->data;
printf("--condition %s\"%s\" ", (info->invert) ? "! " : "", info->name);
}
static struct iptables_match condition = {
.name = "condition",
.version = IPTABLES_VERSION,
.size = IPT_ALIGN(sizeof(struct condition_info)),
.userspacesize = IPT_ALIGN(sizeof(struct condition_info)),
.help = &help,
.init = &init,
.parse = &parse,
.final_check = &final_check,
.print = &print,
.save = &save,
.extra_opts = opts
};
void
_init(void)
{
register_match(&condition);
}
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