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/* 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);
}
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