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#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/socket.h>
#include <getopt.h>
#include "../include/ebtables_u.h"
#include <linux/netfilter_bridge/ebt_log.h>
// copied from syslog.h
// used for the LOG target
#define LOG_EMERG 0 // system is unusable
#define LOG_ALERT 1 // action must be taken immediately
#define LOG_CRIT 2 // critical conditions
#define LOG_ERR 3 // error conditions
#define LOG_WARNING 4 // warning conditions
#define LOG_NOTICE 5 // normal but significant condition
#define LOG_INFO 6 // informational
#define LOG_DEBUG 7 // debug-level messages
#define LOG_DEFAULT_LEVEL LOG_INFO
typedef struct _code {
char *c_name;
int c_val;
} CODE;
static 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 },
{ NULL, -1 }
};
static int name_to_loglevel(char* arg)
{
int i = 0, c_val = eight_priority[0].c_val;
while (c_val != -1) {
if (!strcmp(arg, eight_priority[i].c_name))
return c_val;
i++;
c_val = eight_priority[i].c_val;
}
// return bad loglevel
return 9;
}
#define LOG_PREFIX '1'
#define LOG_LEVEL '2'
#define LOG_ARP '3'
#define LOG_IP '4'
#define LOG_LOG '5'
static struct option opts[] =
{
{ "log-prefix", required_argument, 0, LOG_PREFIX },
{ "log-level" , required_argument, 0, LOG_LEVEL },
{ "log-arp" , no_argument , 0, LOG_ARP },
{ "log-ip" , no_argument , 0, LOG_IP },
{ "log" , no_argument , 0, LOG_LOG },
{ 0 }
};
static void print_help()
{
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"
, EBT_LOG_PREFIX_SIZE - 1);
printf("levels:\n");
for (i = 0; i < 8; i++)
printf("%d = %s\n", eight_priority[i].c_val,
eight_priority[i].c_name);
}
static void init(struct ebt_entry_watcher *watcher)
{
struct ebt_log_info *loginfo = (struct ebt_log_info *)watcher->data;
loginfo->bitmask = 0;
loginfo->prefix[0] = '\0';
loginfo->loglevel = LOG_NOTICE;
}
#define OPT_PREFIX 0x01
#define OPT_LEVEL 0x02
#define OPT_ARP 0x04
#define OPT_IP 0x08
#define OPT_LOG 0x10
static int parse(int c, char **argv, int argc, const struct ebt_u_entry *entry,
unsigned int *flags, struct ebt_entry_watcher **watcher)
{
struct ebt_log_info *loginfo = (struct ebt_log_info *)(*watcher)->data;
int i;
char *end;
switch (c) {
case LOG_PREFIX:
check_option(flags, OPT_PREFIX);
if (strlen(optarg) > sizeof(loginfo->prefix) - 1)
print_error("Prefix too long");
strcpy(loginfo->prefix, optarg);
break;
case LOG_LEVEL:
check_option(flags, OPT_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)
print_error("Problem with the log-level");
break;
case LOG_IP:
check_option(flags, OPT_IP);
loginfo->bitmask |= EBT_LOG_IP;
break;
case LOG_ARP:
check_option(flags, OPT_ARP);
loginfo->bitmask |= EBT_LOG_ARP;
break;
case LOG_LOG:
check_option(flags, OPT_LOG);
break;
default:
return 0;
}
return 1;
}
static void final_check(const struct ebt_u_entry *entry,
const struct ebt_entry_watcher *watcher, const char *name,
unsigned int hook_mask, unsigned int time)
{
return;
}
static void print(const struct ebt_u_entry *entry,
const struct ebt_entry_watcher *watcher)
{
struct ebt_log_info *loginfo = (struct ebt_log_info *)watcher->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");
printf(" ");
}
static int compare(const struct ebt_entry_watcher *w1,
const struct ebt_entry_watcher *w2)
{
struct ebt_log_info *loginfo1 = (struct ebt_log_info *)w1->data;
struct ebt_log_info *loginfo2 = (struct ebt_log_info *)w2->data;
if (loginfo1->loglevel != loginfo2->loglevel)
return 0;
if (loginfo1->bitmask != loginfo2->bitmask)
return 0;
return !strcmp(loginfo1->prefix, loginfo2->prefix);
}
static struct ebt_u_watcher log_watcher =
{
EBT_LOG_WATCHER,
sizeof(struct ebt_log_info),
print_help,
init,
parse,
final_check,
print,
compare,
opts,
};
#undef _init
static void _init(void) __attribute__ ((constructor));
static void _init(void)
{
register_watcher(&log_watcher);
}
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