/*
 * Copyright (C) 2012 Free Software Foundation, Inc.
 *
 * Author: Nikos Mavrogiannopoulos
 *
 * This file is part of GnuTLS.
 *
 * GnuTLS 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 of the License, or
 * (at your option) any later version.
 *
 * GnuTLS 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 GnuTLS; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
 */

#ifdef HAVE_CONFIG_H
#include <config.h>
#endif

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#if defined(_WIN32)

int main()
{
  exit(77);
}

#else

#include <sys/types.h>
#include <netinet/in.h>
#include <sys/socket.h>
#include <sys/wait.h>
#include <arpa/inet.h>
#include <unistd.h>
#include <gnutls/gnutls.h>
#include <gnutls/dtls.h>
#include <signal.h>

#include "utils.h"

/* This program tests whether the handshake timeout value is enforced.
 */

static void
server_log_func (int level, const char *str)
{
  fprintf (stderr, "server|<%d>| %s", level, str);
}

static void
client_log_func (int level, const char *str)
{
  fprintf (stderr, "client|<%d>| %s", level, str);
}

/* A very basic TLS client, with anonymous authentication.
 */

static void
client (int fd, int wait)
{
  int ret;
  gnutls_anon_client_credentials_t anoncred;
  gnutls_session_t session;
  /* Need to enable anonymous KX specifically. */

  global_init ();

  if (debug)
    {
      gnutls_global_set_log_function (client_log_func);
      gnutls_global_set_log_level (4711);
    }

  gnutls_anon_allocate_client_credentials (&anoncred);

  /* Initialize TLS session
   */
  gnutls_init (&session, GNUTLS_CLIENT);
  gnutls_handshake_set_timeout( session, 20*1000);

  /* Use default priorities */
  gnutls_priority_set_direct (session, "NORMAL:+ANON-ECDH", NULL);

  /* put the anonymous credentials to the current session
   */
  gnutls_credentials_set (session, GNUTLS_CRD_ANON, anoncred);

  gnutls_transport_set_int (session, fd);

  /* Perform the TLS handshake
   */
  do 
    {
      ret = gnutls_handshake (session);
    }
  while (ret < 0 && gnutls_error_is_fatal(ret) == 0);

  gnutls_deinit(session);
  gnutls_anon_free_client_credentials(anoncred);
  gnutls_global_deinit();

  if (ret < 0)
    {
      if (ret != GNUTLS_E_TIMEDOUT || wait == 0) 
        {
          if (debug) fail("client: unexpected error: %s\n", gnutls_strerror(ret));
          exit(1);
        }
      if (debug) success("client: expected timeout occured\n");
      return;
    }
  else
    {
      gnutls_bye(session, GNUTLS_SHUT_WR);

      if (wait != 0) 
        {
          fail ("client: handshake was completed unexpectedly\n");
          gnutls_perror (ret);
          exit(1);
        }
    }

  return;
}

static void
initialize_tls_session (gnutls_session_t * session)
{
  gnutls_init (session, GNUTLS_SERVER);

  /* avoid calling all the priority functions, since the defaults
   * are adequate.
   */
  gnutls_priority_set_direct (*session, "NORMAL:+ANON-ECDH", NULL);
}

static void
server (int fd, int wait)
{
int ret;
gnutls_session_t session;
gnutls_anon_server_credentials_t anoncred;

  /* this must be called once in the program
   */
  global_init ();

  if (debug)
    {
      gnutls_global_set_log_function (server_log_func);
      gnutls_global_set_log_level (4711);
    }

  gnutls_anon_allocate_server_credentials (&anoncred);

  initialize_tls_session (&session);
  gnutls_credentials_set (session, GNUTLS_CRD_ANON, anoncred);

  gnutls_transport_set_int (session, fd);

  if (wait) sleep(25);
  else 
    {
      do 
        {
          ret = gnutls_handshake (session);
        }
      while (ret < 0 && gnutls_error_is_fatal(ret) == 0);
  
      if (ret == 0)
        gnutls_bye(session, GNUTLS_SHUT_RDWR);
    }

  gnutls_deinit (session);
  gnutls_anon_free_server_credentials(anoncred);
  gnutls_global_deinit();
}

static void start (int wait)
{
  int fd[2];
  int ret;
  pid_t child;
  
  if (debug && wait)
    fprintf(stderr, "\nWill test timeout\n");
  
  ret = socketpair(AF_UNIX, SOCK_STREAM, 0, fd);
  if (ret < 0)
    {
      perror("socketpair");
      exit(1);
    }

  child = fork ();
  if (child < 0)
    {
      perror ("fork");
      fail ("fork");
      exit(1);
    }

  if (child)
    {
      /* parent */
      close(fd[1]);
      server (fd[0], wait);
      close(fd[0]);
    }
  else 
    {
      close(fd[0]);
      client (fd[1], wait);
      close(fd[1]);
      exit(0);
    }
}

static void ch_handler(int sig)
{
int status;
  wait(&status);
  if (WEXITSTATUS(status) != 0)
    fail("Child died with status %d\n", WEXITSTATUS(status));
  return;
}

void
doit (void)
{
  signal(SIGCHLD, ch_handler);

  /* make sure that normal handshake occurs */
  start(0);
  
  /* check the handshake with an expected timeout */
  start(1);
}

#endif /* _WIN32 */