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/* Shared library add-on to ip6tables for condition match */
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <getopt.h>
#include <ip6tables.h>
#include<linux/netfilter_ipv6/ip6_tables.h>
#include<linux/netfilter_ipv6/ip6t_condition.h>
static void condition_help(void)
{
printf("condition match v%s options:\n"
"--condition [!] filename "
"Match on boolean value stored in /proc file\n",
IPTABLES_VERSION);
}
static const struct option condition_opts[] = {
{ .name = "condition", .has_arg = 1, .flag = 0, .val = 'X' },
{ .name = 0 }
};
static int
condition_parse(int c, char **argv, int invert, unsigned int *flags,
const void *entry, struct xt_entry_match **match)
{
struct condition6_info *info =
(struct condition6_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]) < CONDITION6_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 condition_check(unsigned int flags)
{
if (!flags)
exit_error(PARAMETER_PROBLEM,
"Condition match: must specify --condition");
}
static void condition_print(const void *ip, const struct xt_entry_match *match,
int numeric)
{
const struct condition6_info *info =
(const struct condition6_info *) match->data;
printf("condition %s%s ", (info->invert) ? "!" : "", info->name);
}
static void condition_save(const void *ip, const struct xt_entry_match *match)
{
const struct condition6_info *info =
(const struct condition6_info *) match->data;
printf("--condition %s\"%s\" ", (info->invert) ? "! " : "", info->name);
}
static struct ip6tables_match condition_match6 = {
.name = "condition",
.version = IPTABLES_VERSION,
.size = IP6T_ALIGN(sizeof(struct condition6_info)),
.userspacesize = IP6T_ALIGN(sizeof(struct condition6_info)),
.help = condition_help,
.parse = condition_parse,
.final_check = condition_check,
.print = condition_print,
.save = condition_save,
.extra_opts = condition_opts,
};
void
_init(void)
{
register_match6(&condition_match6);
}
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