/* Shared library add-on to iptables to add CRASH support.
   Author: Intra2net AG <opensource@intra2net.com>
   Licensed under the GPL v2.
*/

#include <stdio.h>
#include <netdb.h>
#include <string.h>
#include <stdlib.h>
#include <syslog.h>
#include <getopt.h>
#include <iptables.h>
#include <linux/netfilter_ipv4/ip_tables.h>
#include <linux/netfilter_ipv4/ipt_CRASH.h>

static struct option opts[] = {
    { .name = 0 }
};

/* Function which prints out usage message. */
static void help(void)
{
    printf(
"CRASH v%s options:\n", IPTABLES_VERSION);
}

/* Initialize the target. */
static void
init(struct ipt_entry_target *t, unsigned int *nfcache)
{
    /* Can't cache this */
    *nfcache |= NFC_UNKNOWN;
}

/* 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,
      struct ipt_entry_target **target)
{
    return 0;
}

/* Final check; nothing. */
static void final_check(unsigned int flags)
{
}

static void print_it(const struct ipt_ip *ip,
                     const struct ipt_entry_target *target, char do_prefix)
{
    if (!do_prefix)
        printf("CRASH ");
}

/* Prints out the targinfo. */
static void
print(const struct ipt_ip *ip,
      const struct ipt_entry_target *target,
      int numeric)
{
    print_it (ip, target, 0);
}

/* Saves the union ipt_targinfo in parsable form to stdout. */
static void
save(const struct ipt_ip *ip, const struct ipt_entry_target *target)
{
    print_it(ip, target, 1);
}

static
struct iptables_target crash
= {
    .next          = NULL,
    .name          = "CRASH",
    .version       = IPTABLES_VERSION,
    .size          = IPT_ALIGN(sizeof(struct ipt_crash_info)),
    .userspacesize = IPT_ALIGN(sizeof(struct ipt_crash_info)),
    .help          = &help,
    .init          = &init,
    .parse         = &parse,
    .final_check   = &final_check,
    .print         = &print,
    .save          = &save,
    .extra_opts    = opts
};

void _init(void)
{
    register_target(&crash);
}