#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;

	if (params->escape_quotes)

		xt_xlate_add(xl, "ct helper%s \\\"%s\\\"",

			   info->invert ? " !=" : "", info->name);

	else

		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);

}