/*	$OpenBSD: sysdep.c,v 1.2 2003/06/03 14:53:11 ho Exp $	*/

/*
 * Copyright (c) 1998, 1999 Niklas Hallqvist.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

/*
 * This code was written under funding by Ericsson Radio Systems.
 */

#include <sys/types.h>
#include <sys/socket.h>
#include <sys/time.h>
#include <netinet/in.h>
#include <stdlib.h>
#include <string.h>
#include <fcntl.h>
#include <md5.h>
#include <unistd.h>

#include "sysdep.h"

#ifdef NEED_SYSDEP_APP
#include "app.h"
#include "conf.h"
#include "ipsec.h"
#include "klips.h"
#endif /* NEED_SYSDEP_APP */
#include "log.h"
#include "sysdep.h"

extern char *__progname;

u_int32_t
sysdep_random ()
{
  u_int32_t rndval;
  u_char sig[16];
  MD5_CTX ctx;
  int fd, i;
  struct {
    struct timeval tv;
    u_int rnd[(128 - sizeof (struct timeval)) / sizeof (u_int)];
  } rdat;

  fd = open ("/dev/urandom", O_RDONLY);
  if (fd != -1)
    {
      read (fd, rdat.rnd, sizeof(rdat.rnd));
      close (fd);
    }
  MD5Init (&ctx);
  MD5Update (&ctx, (char *)&rdat, sizeof(rdat));
  MD5Final (sig, &ctx);

  rndval = 0;	
  for (i = 0; i < 4; i++)
    {
      u_int32_t *tmp = (u_int32_t *)&sig[i * 4];
      rndval ^= *tmp;
    }
		
  return rndval;
}

char *
sysdep_progname ()
{
  return __progname;
}

/* Return the length of the sockaddr struct.  */
u_int8_t
sysdep_sa_len (struct sockaddr *sa)
{
  switch (sa->sa_family)
    {
    case AF_INET:
      return sizeof (struct sockaddr_in);
    case AF_INET6:
      return sizeof (struct sockaddr_in6);
    }
  log_print ("sysdep_sa_len: unknown sa family %d", sa->sa_family);
  return sizeof (struct sockaddr_in);
}

/* As regress/ use this file I protect the sysdep_app_* stuff like this.  */
#ifdef NEED_SYSDEP_APP
int
sysdep_app_open ()
{
  return klips_open ();
}

void
sysdep_app_handler (int fd)
{
}

/* Check that the connection named NAME is active, or else make it active.  */
void
sysdep_connection_check (char *name)
{
  klips_connection_check (name);
}

/*
 * Generate a SPI for protocol PROTO and the source/destination pair given by
 * SRC, SRCLEN, DST & DSTLEN.  Stash the SPI size in SZ.
 */
u_int8_t *
sysdep_ipsec_get_spi (size_t *sz, u_int8_t proto, struct sockaddr *src,
		      struct sockaddr *dst, u_int32_t seq)
{
  if (app_none)
    {
      *sz = IPSEC_SPI_SIZE;
      /* XXX should be random instead I think.  */
      return strdup ("\x12\x34\x56\x78");
    }

  return klips_get_spi (sz, proto, src, dst, seq);
}

int
sysdep_cleartext (int fd, int af)
{
  return 0;
}

int
sysdep_ipsec_delete_spi (struct sa *sa, struct proto *proto, int incoming)
{
  return klips_delete_spi (sa, proto, incoming);
}

int
sysdep_ipsec_enable_sa (struct sa *sa, struct sa *isakmp_sa)
{
  return klips_enable_sa (sa, isakmp_sa);
}

int
sysdep_ipsec_group_spis (struct sa *sa, struct proto *proto1,
			 struct proto *proto2, int incoming)
{
  return klips_group_spis (sa, proto1, proto2, incoming);
}

int
sysdep_ipsec_set_spi (struct sa *sa, struct proto *proto, int incoming,
		      struct sa *isakmp_sa)
{
  return klips_set_spi (sa, proto, incoming, isakmp_sa);
}
#endif
