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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 <string.h>
#include <stdlib.h>
#include <getopt.h>
#include <iptables.h>
#include <linux/netfilter_ipv4/ipt_comment.h>
/* Function which prints out usage message. */
static void
help(void)
{
printf(
"COMMENT match options:\n"
"--comment COMMENT Attach a comment to a rule\n\n"
);
}
static struct option opts[] = {
{ "comment", 1, 0, '1' },
{0}
};
/* Initialize the match. */
static void
init(struct ipt_entry_match *m, unsigned int *nfcache)
{
*nfcache |= NFC_UNKNOWN;
}
static void
parse_comment(const unsigned char *s, struct ipt_comment_info *info)
{
int slen = strlen(s);
if (slen >= IPT_MAX_COMMENT_LEN) {
exit_error(PARAMETER_PROBLEM,
"COMMENT must be shorter than %i characters", IPT_MAX_COMMENT_LEN);
}
strcpy(info->comment, s);
}
/* Function which parses command options; returns true if it
ate an option */
static int
parse(int c, char **argv, int invert, unsigned int *flags,
const struct ipt_entry *entry,
unsigned int *nfcache,
struct ipt_entry_match **match)
{
struct ipt_comment_info *commentinfo = (struct ipt_comment_info *)(*match)->data;
switch (c) {
case '1':
check_inverse(argv[optind-1], &invert, &optind, 0);
if (invert) {
exit_error(PARAMETER_PROBLEM,
"Sorry, you can't have an inverted comment");
}
parse_comment(argv[optind-1], commentinfo);
*flags = 1;
break;
default:
return 0;
}
return 1;
}
/* Final check; must have specified --comment. */
static void
final_check(unsigned int flags)
{
if (!flags)
exit_error(PARAMETER_PROBLEM,
"COMMENT match: You must specify `--comment'");
}
/* Prints out the matchinfo. */
static void
print(const struct ipt_ip *ip,
const struct ipt_entry_match *match,
int numeric)
{
struct ipt_comment_info *commentinfo = (struct ipt_comment_info *)match->data;
commentinfo->comment[IPT_MAX_COMMENT_LEN-1] = '\0';
printf("/* %s */ ", commentinfo->comment);
}
/* Saves the union ipt_matchinfo in parsable form to stdout. */
static void
save(const struct ipt_ip *ip, const struct ipt_entry_match *match)
{
struct ipt_comment_info *commentinfo = (struct ipt_comment_info *)match->data;
commentinfo->comment[IPT_MAX_COMMENT_LEN-1] = '\0';
printf("--comment \"%s\" ", commentinfo->comment);
}
static struct iptables_match comment = {
.next = NULL,
.name = "comment",
.version = IPTABLES_VERSION,
.size = IPT_ALIGN(sizeof(struct ipt_comment_info)),
.userspacesize = IPT_ALIGN(sizeof(struct ipt_comment_info)),
.help = &help,
.init = &init,
.parse = &parse,
.final_check = &final_check,
.print = &print,
.save = &save,
.extra_opts = opts
};
void _init(void)
{
register_match(&comment);
}
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