/usr/src/xtables-addons-2.6/extensions/libxt_LOGMARK.c is in xtables-addons-dkms 2.6-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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* "LOGMARK" target extension for iptables
* Copyright © Jan Engelhardt, 2008
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License; either
* version 2 of the License, or any later version, as published by the
* Free Software Foundation.
*/
#include <getopt.h>
#include <stdbool.h>
#include <stdio.h>
#include <string.h>
#include <xtables.h>
#include "xt_LOGMARK.h"
#include "compat_user.h"
enum {
F_LEVEL = 1 << 0,
F_PREFIX = 1 << 1,
};
static const struct option logmark_tg_opts[] = {
{.name = "log-level", .has_arg = true, .val = 'l'},
{.name = "log-prefix", .has_arg = true, .val = 'p'},
{NULL},
};
static void logmark_tg_help(void)
{
printf(
"LOGMARK target options:\n"
" --log-level level Level of logging (numeric, 0-8)\n"
" --log-prefix prefix Prefix log messages with this string\n"
);
}
static void logmark_tg_init(struct xt_entry_target *target)
{
struct xt_logmark_tginfo *info = (void *)target->data;
info->level = 4;
*info->prefix = '\0';
}
static int
logmark_tg_parse(int c, char **argv, int invert, unsigned int *flags,
const void *entry, struct xt_entry_target **target)
{
struct xt_logmark_tginfo *info = (void *)(*target)->data;
unsigned int x;
switch (c) {
case 'l': /* --log-level */
xtables_param_act(XTF_ONLY_ONCE, "LOGMARK", "--log-level", *flags & F_LEVEL);
xtables_param_act(XTF_NO_INVERT, "LOGMARK", "--log-level", invert);
if (!xtables_strtoui(optarg, NULL, &x, 0, 8))
xtables_param_act(XTF_BAD_VALUE, "LOGMARK", "--log-level", optarg);
info->level = x;
*flags |= F_LEVEL;
return true;
case 'p': /* --log-prefix */
xtables_param_act(XTF_ONLY_ONCE, "LOGMARK", "--log-prefix", *flags & F_PREFIX);
xtables_param_act(XTF_NO_INVERT, "LOGMARK", "--log-prefix", invert);
if (strlen(optarg) > sizeof(info->prefix))
xtables_error(PARAMETER_PROBLEM, "LOGMARK: Maximum "
"prefix length is %zu",
sizeof(info->prefix));
if (strchr(optarg, '\n'))
xtables_error(PARAMETER_PROBLEM, "LOGMARK: Newlines not "
"allowed in log prefix");
strncpy(info->prefix, optarg, sizeof(info->prefix));
*flags |= F_PREFIX;
return true;
}
return false;
}
static void
logmark_tg_save(const void *ip, const struct xt_entry_target *target)
{
const struct xt_logmark_tginfo *info = (void *)target->data;
if (info->level != 4)
printf(" --log-level %u ", info->level);
if (*info->prefix != '\0')
printf(" --log-prefix \"%s\" ", info->prefix);
}
static void
logmark_tg_print(const void *ip, const struct xt_entry_target *target,
int numeric)
{
printf(" -j LOGMARK");
logmark_tg_save(ip, target);
}
static struct xtables_target logmark_tg_reg = {
.version = XTABLES_VERSION,
.name = "LOGMARK",
.revision = 0,
.family = NFPROTO_UNSPEC,
.size = XT_ALIGN(sizeof(struct xt_logmark_tginfo)),
.userspacesize = XT_ALIGN(sizeof(struct xt_logmark_tginfo)),
.help = logmark_tg_help,
.init = logmark_tg_init,
.parse = logmark_tg_parse,
.print = logmark_tg_print,
.save = logmark_tg_save,
.extra_opts = logmark_tg_opts,
};
static __attribute__((constructor)) void logmark_tg_ldr(void)
{
xtables_register_target(&logmark_tg_reg);
}
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