/*
     This file is part of GNUnet.
     Copyright (C) 2010, 2011, 2012 Christian Grothoff

     GNUnet is free software; you can redistribute it and/or modify
     it under the terms of the GNU General Public License as published
     by the Free Software Foundation; either version 3, or (at your
     option) any later version.

     GNUnet is distributed in the hope that it will be useful, but
     WITHOUT ANY WARRANTY; without even the implied warranty of
     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
     General Public License for more details.

     You should have received a copy of the GNU General Public License
     along with GNUnet; see the file COPYING.  If not, write to the
     Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
     Boston, MA 02110-1301, USA.
*/

/**
 * @file tun/test_tun.c
 * @brief test for tun.c
 * @author Christian Grothoff
 */
#include "platform.h"
#include "gnunet_tun_lib.h"

static int ret;

static void
test_udp (size_t pll,
	  int pl_fill,
	  uint16_t crc)
{
  struct GNUNET_TUN_IPv4Header ip;
  struct GNUNET_TUN_UdpHeader udp;
  char payload[pll];
  struct in_addr src;
  struct in_addr dst;

  GNUNET_assert (1 == inet_pton (AF_INET, "1.2.3.4", &src));
  GNUNET_assert (1 == inet_pton (AF_INET, "122.2.3.5", &dst));
  memset (payload, pl_fill, sizeof (payload));
  GNUNET_TUN_initialize_ipv4_header (&ip,
				     IPPROTO_UDP,
				     pll + sizeof (udp),
				     &src,
				     &dst);
  udp.source_port = htons (4242);
  udp.destination_port = htons (4242);
  udp.len = htons (pll);
  GNUNET_TUN_calculate_udp4_checksum (&ip,
				      &udp,
				      payload,
				      pll);
  if (crc != ntohs (udp.crc))
  {
    fprintf (stderr, "Got CRC: %u, wanted: %u\n",
	     ntohs (udp.crc),
	     crc);
    ret = 1;
  }
}

int main (int argc,
	  char **argv)
{
  test_udp (4, 3, 22439);
  test_udp (4, 1, 23467);
  test_udp (7, 17, 6516);
  test_udp (12451, 251, 42771);
  return ret;
}
