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