/* Shared library add-on to iptables to add comment match support.

 *

 * ChangeLog

 *     2003-05-13: Brad Fisher <brad@info-link.net>

 *         Initial comment match

 *     2004-05-12: Brad Fisher <brad@info-link.net>

 *         Port to patch-o-matic-ng

 */

#include <stdio.h>

#include <xtables.h>

#include <linux/netfilter/xt_comment.h>

enum {

	O_COMMENT = 0,

};

static void comment_help(void)

{

	printf(

		"comment match options:\n"

		"--comment COMMENT             Attach a comment to a rule\n");

}

static const struct xt_option_entry comment_opts[] = {

	{.name = "comment", .id = O_COMMENT, .type = XTTYPE_STRING,

	 .flags = XTOPT_MAND | XTOPT_PUT,

	 XTOPT_POINTER(struct xt_comment_info, comment)},

	XTOPT_TABLEEND,

};

static void

comment_print(const void *ip, const struct xt_entry_match *match, int numeric)

{

	struct xt_comment_info *commentinfo = (void *)match->data;

	commentinfo->comment[XT_MAX_COMMENT_LEN-1] = '\0';

	printf(" /* %s */", commentinfo->comment);

}

/* Saves the union ipt_matchinfo in parsable form to stdout. */

static void

comment_save(const void *ip, const struct xt_entry_match *match)

{

	struct xt_comment_info *commentinfo = (void *)match->data;

	commentinfo->comment[XT_MAX_COMMENT_LEN-1] = '\0';

	printf(" --comment");

	xtables_save_string(commentinfo->comment);

}

static int comment_xlate(struct xt_xlate *xl,

			 const struct xt_xlate_mt_params *params)

{

	struct xt_comment_info *commentinfo = (void *)params->match->data;

	char comment[XT_MAX_COMMENT_LEN + sizeof("\\\"\\\"")];

	commentinfo->comment[XT_MAX_COMMENT_LEN - 1] = '\0';

	if (params->escape_quotes)

		snprintf(comment, sizeof(comment), "\\\"%s\\\"",

			 commentinfo->comment);

	else

		snprintf(comment, sizeof(comment), "\"%s\"",

			 commentinfo->comment);

	xt_xlate_add_comment(xl, comment);

	return 1;

}

static struct xtables_match comment_match = {

	.family		= NFPROTO_UNSPEC,

	.name		= "comment",

	.version	= XTABLES_VERSION,

	.size		= XT_ALIGN(sizeof(struct xt_comment_info)),

	.userspacesize	= XT_ALIGN(sizeof(struct xt_comment_info)),

	.help		= comment_help,

	.print 		= comment_print,

	.save 		= comment_save,

	.x6_parse	= xtables_option_parse,

	.x6_options	= comment_opts,

	.xlate		= comment_xlate,

};

void _init(void)

{

	xtables_register_match(&comment_match);

}