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#include <stdio.h>
#include <xtables.h>
#include <linux/netfilter/xt_helper.h>
enum {
O_HELPER = 0,
};
static void helper_help(void)
{
printf(
"helper match options:\n"
"[!] --helper string Match helper identified by string\n");
}
static const struct xt_option_entry helper_opts[] = {
{.name = "helper", .id = O_HELPER, .type = XTTYPE_STRING,
.flags = XTOPT_MAND | XTOPT_INVERT | XTOPT_PUT,
XTOPT_POINTER(struct xt_helper_info, name)},
XTOPT_TABLEEND,
};
static void helper_parse(struct xt_option_call *cb)
{
struct xt_helper_info *info = cb->data;
xtables_option_parse(cb);
if (cb->invert)
info->invert = 1;
}
static void
helper_print(const void *ip, const struct xt_entry_match *match, int numeric)
{
const struct xt_helper_info *info = (const void *)match->data;
printf(" helper match %s\"%s\"", info->invert ? "! " : "", info->name);
}
static void helper_save(const void *ip, const struct xt_entry_match *match)
{
const struct xt_helper_info *info = (const void *)match->data;
printf("%s --helper", info->invert ? " !" : "");
xtables_save_string(info->name);
}
static int helper_xlate(struct xt_xlate *xl,
const struct xt_xlate_mt_params *params)
{
const struct xt_helper_info *info = (const void *)params->match->data;
xt_xlate_add(xl, "ct helper%s \"%s\"",
info->invert ? " !=" : "", info->name);
return 1;
}
static struct xtables_match helper_match = {
.family = NFPROTO_UNSPEC,
.name = "helper",
.version = XTABLES_VERSION,
.size = XT_ALIGN(sizeof(struct xt_helper_info)),
.help = helper_help,
.print = helper_print,
.save = helper_save,
.x6_parse = helper_parse,
.x6_options = helper_opts,
.xlate = helper_xlate,
};
void _init(void)
{
xtables_register_match(&helper_match);
}
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