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/*
* Bart De Schuymer <bdschuym@pandora.be>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
* Giuseppe Longo <giuseppelng@gmail.com> adapted the original code to the
* xtables-compat environment in 2015.
*
*/
#include <stdio.h>
#include <stdlib.h>
#include <syslog.h>
#include <string.h>
#include <getopt.h>
#include <xtables.h>
#include <linux/netfilter_bridge/ebt_log.h>
#define LOG_DEFAULT_LEVEL LOG_INFO
#define LOG_PREFIX '1'
#define LOG_LEVEL '2'
#define LOG_ARP '3'
#define LOG_IP '4'
#define LOG_LOG '5'
#define LOG_IP6 '6'
struct code {
char *c_name;
int c_val;
};
static struct code eight_priority[] = {
{ "emerg", LOG_EMERG },
{ "alert", LOG_ALERT },
{ "crit", LOG_CRIT },
{ "error", LOG_ERR },
{ "warning", LOG_WARNING },
{ "notice", LOG_NOTICE },
{ "info", LOG_INFO },
{ "debug", LOG_DEBUG }
};
static int name_to_loglevel(const char *arg)
{
int i;
for (i = 0; i < 8; i++)
if (!strcmp(arg, eight_priority[i].c_name))
return eight_priority[i].c_val;
/* return bad loglevel */
return 9;
}
static const struct option brlog_opts[] = {
{ .name = "log-prefix", .has_arg = true, .val = LOG_PREFIX },
{ .name = "log-level", .has_arg = true, .val = LOG_LEVEL },
{ .name = "log-arp", .has_arg = false, .val = LOG_ARP },
{ .name = "log-ip", .has_arg = false, .val = LOG_IP },
{ .name = "log", .has_arg = false, .val = LOG_LOG },
{ .name = "log-ip6", .has_arg = false, .val = LOG_IP6 },
XT_GETOPT_TABLEEND,
};
static void brlog_help(void)
{
int i;
printf(
"log options:\n"
"--log : use this if you're not specifying anything\n"
"--log-level level : level = [1-8] or a string\n"
"--log-prefix prefix : max. %d chars.\n"
"--log-ip : put ip info. in the log for ip packets\n"
"--log-arp : put (r)arp info. in the log for (r)arp packets\n"
"--log-ip6 : put ip6 info. in the log for ip6 packets\n"
, EBT_LOG_PREFIX_SIZE - 1);
for (i = 0; i < 8; i++)
printf("%d = %s\n", eight_priority[i].c_val,
eight_priority[i].c_name);
}
static void brlog_init(struct xt_entry_target *t)
{
struct ebt_log_info *loginfo = (struct ebt_log_info *)t->data;
loginfo->bitmask = 0;
loginfo->prefix[0] = '\0';
loginfo->loglevel = LOG_NOTICE;
}
static unsigned int log_chk_inv(int inv, unsigned int bit, const char *suffix)
{
if (inv)
xtables_error(PARAMETER_PROBLEM,
"Unexpected `!' after --log%s", suffix);
return bit;
}
static int brlog_parse(int c, char **argv, int invert, unsigned int *flags,
const void *entry, struct xt_entry_target **target)
{
struct ebt_log_info *loginfo = (struct ebt_log_info *)(*target)->data;
long int i;
char *end;
switch (c) {
case LOG_PREFIX:
if (invert)
xtables_error(PARAMETER_PROBLEM,
"Unexpected `!` after --log-prefix");
if (strlen(optarg) > sizeof(loginfo->prefix) - 1)
xtables_error(PARAMETER_PROBLEM,
"Prefix too long");
if (strchr(optarg, '\"'))
xtables_error(PARAMETER_PROBLEM,
"Use of \\\" is not allowed"
" in the prefix");
strcpy((char *)loginfo->prefix, (char *)optarg);
break;
case LOG_LEVEL:
i = strtol(optarg, &end, 16);
if (*end != '\0' || i < 0 || i > 7)
loginfo->loglevel = name_to_loglevel(optarg);
else
loginfo->loglevel = i;
if (loginfo->loglevel == 9)
xtables_error(PARAMETER_PROBLEM,
"Problem with the log-level");
break;
case LOG_IP:
loginfo->bitmask |= log_chk_inv(invert, EBT_LOG_IP, "-ip");
break;
case LOG_ARP:
loginfo->bitmask |= log_chk_inv(invert, EBT_LOG_ARP, "-arp");
break;
case LOG_LOG:
loginfo->bitmask |= log_chk_inv(invert, 0, "");
break;
case LOG_IP6:
loginfo->bitmask |= log_chk_inv(invert, EBT_LOG_IP6, "-ip6");
break;
default:
return 0;
}
*flags |= loginfo->bitmask;
return 1;
}
static void brlog_final_check(unsigned int flags)
{
}
static void brlog_print(const void *ip, const struct xt_entry_target *target,
int numeric)
{
struct ebt_log_info *loginfo = (struct ebt_log_info *)target->data;
printf("--log-level %s --log-prefix \"%s\"",
eight_priority[loginfo->loglevel].c_name,
loginfo->prefix);
if (loginfo->bitmask & EBT_LOG_IP)
printf(" --log-ip");
if (loginfo->bitmask & EBT_LOG_ARP)
printf(" --log-arp");
if (loginfo->bitmask & EBT_LOG_IP6)
printf(" --log-ip6");
printf(" ");
}
static int brlog_xlate(struct xt_xlate *xl,
const struct xt_xlate_tg_params *params)
{
const struct ebt_log_info *loginfo = (const void *)params->target->data;
xt_xlate_add(xl, "log");
if (loginfo->prefix[0]) {
if (params->escape_quotes)
xt_xlate_add(xl, " prefix \\\"%s\\\"", loginfo->prefix);
else
xt_xlate_add(xl, " prefix \"%s\"", loginfo->prefix);
}
if (loginfo->loglevel != LOG_DEFAULT_LEVEL)
xt_xlate_add(xl, " level %s", eight_priority[loginfo->loglevel].c_name);
xt_xlate_add(xl, " flags ether ");
return 1;
}
static struct xtables_target brlog_target = {
.name = "log",
.revision = 0,
.version = XTABLES_VERSION,
.family = NFPROTO_BRIDGE,
.size = XT_ALIGN(sizeof(struct ebt_log_info)),
.userspacesize = XT_ALIGN(sizeof(struct ebt_log_info)),
.init = brlog_init,
.help = brlog_help,
.parse = brlog_parse,
.final_check = brlog_final_check,
.print = brlog_print,
.xlate = brlog_xlate,
.extra_opts = brlog_opts,
};
void _init(void)
{
xtables_register_target(&brlog_target);
}
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