/*
     This file is part of libmicrohttpd
     Copyright (C) 2007 Christian Grothoff
     Copyright (C) 2016-2019 Evgeny Grin (Karlson2k)

     libmicrohttpd 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 2, or (at your
     option) any later version.

     libmicrohttpd 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 libmicrohttpd; see the file COPYING.  If not, write to the
     Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
     Boston, MA 02110-1301, USA.
*/

/**
 * @file test_timeout.c
 * @brief  Testcase for libmicrohttpd PUT operations
 * @author Matthias Wachs
 * @author Karlson2k (Evgeny Grin)
 */

#include "MHD_config.h"
#include "platform.h"
#include <curl/curl.h>
#include <microhttpd.h>
#include <stdlib.h>
#include <string.h>
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif /* HAVE_UNISTD_H */
#ifdef HAVE_TIME_H
#include <time.h>
#endif /* HAVE_TIME_H */
#include "mhd_has_in_name.h"


/**
 * Pause execution for specified number of milliseconds.
 * @param ms the number of milliseconds to sleep
 */
void
_MHD_sleep (uint32_t ms)
{
#if defined(_WIN32)
  Sleep (ms);
#elif defined(HAVE_NANOSLEEP)
  struct timespec slp = {ms / 1000, (ms % 1000) * 1000000};
  struct timespec rmn;
  int num_retries = 0;
  while (0 != nanosleep (&slp, &rmn))
  {
    if (num_retries++ > 8)
      break;
    slp = rmn;
  }
#elif defined(HAVE_USLEEP)
  uint64_t us = ms * 1000;
  do
  {
    uint64_t this_sleep;
    if (999999 < us)
      this_sleep = 999999;
    else
      this_sleep = us;
    /* Ignore return value as it could be void */
    usleep (this_sleep);
    us -= this_sleep;
  } while (us > 0);
#else
  fprintf (stderr, "No sleep function available on this system.\n");
#endif
}


static int oneone;

static int withTimeout = 0;

static int withoutTimeout = 0;

struct CBC
{
  char *buf;
  size_t pos;
  size_t size;
};


static void
termination_cb (void *cls,
                struct MHD_Connection *connection,
                void **req_cls,
                enum MHD_RequestTerminationCode toe)
{
  int *test = cls;
  (void) connection; (void) req_cls;       /* Unused. Silent compiler warning. */

  switch (toe)
  {
  case MHD_REQUEST_TERMINATED_COMPLETED_OK:
    if (test == &withoutTimeout)
    {
      withoutTimeout = 1;
    }
    else
    {
      fprintf (stderr, "Connection completed without errors while "
               "timeout is expected.\n");
    }
    break;
  case MHD_REQUEST_TERMINATED_WITH_ERROR:
    fprintf (stderr, "Connection terminated with error.\n");
    exit (4);
    break;
  case MHD_REQUEST_TERMINATED_READ_ERROR:
    fprintf (stderr, "Connection terminated with read error.\n");
    exit (4);
    break;
  case MHD_REQUEST_TERMINATED_TIMEOUT_REACHED:
    if (test == &withTimeout)
    {
      withTimeout = 1;
    }
    else
    {
      fprintf (stderr, "Connection terminated with timeout while expected "
               "to be successfully completed.\n");
    }
    break;
  case MHD_REQUEST_TERMINATED_DAEMON_SHUTDOWN:
    fprintf (stderr, "Connection terminated by daemon shutdown.\n");
    exit (4);
    break;
  case MHD_REQUEST_TERMINATED_CLIENT_ABORT:
    fprintf (stderr, "Connection terminated by client.\n");
    exit (4);
    break;
  }
}


static size_t
putBuffer (void *stream, size_t size, size_t nmemb, void *ptr)
{
  unsigned int *pos = ptr;
  unsigned int wrt;

  wrt = size * nmemb;
  if (wrt > 8 - (*pos))
    wrt = 8 - (*pos);
  memcpy (stream, &("Hello123"[*pos]), wrt);
  (*pos) += wrt;
  return wrt;
}


static size_t
putBuffer_fail (void *stream, size_t size, size_t nmemb, void *ptr)
{
  (void) stream; (void) size; (void) nmemb; (void) ptr;        /* Unused. Silent compiler warning. */
  _MHD_sleep (100); /* Avoid busy-waiting */
  return 0;
}


static size_t
copyBuffer (void *ptr, size_t size, size_t nmemb, void *ctx)
{
  struct CBC *cbc = ctx;

  if (cbc->pos + size * nmemb > cbc->size)
    return 0;                   /* overflow */
  memcpy (&cbc->buf[cbc->pos], ptr, size * nmemb);
  cbc->pos += size * nmemb;
  return size * nmemb;
}


static enum MHD_Result
ahc_echo (void *cls,
          struct MHD_Connection *connection,
          const char *url,
          const char *method,
          const char *version,
          const char *upload_data, size_t *upload_data_size,
          void **req_cls)
{
  int *done = cls;
  struct MHD_Response *response;
  enum MHD_Result ret;
  (void) version; (void) req_cls;   /* Unused. Silent compiler warning. */

  if (0 != strcmp (MHD_HTTP_METHOD_PUT, method))
    return MHD_NO;              /* unexpected method */
  if ((*done) == 0)
  {
    if (*upload_data_size != 8)
      return MHD_YES;           /* not yet ready */
    if (0 == memcmp (upload_data, "Hello123", 8))
    {
      *upload_data_size = 0;
    }
    else
    {
      printf ("Invalid upload data `%8s'!\n", upload_data);
      return MHD_NO;
    }
    *done = 1;
    return MHD_YES;
  }
  response = MHD_create_response_from_buffer_copy (strlen (url),
                                                   (const void *) url);
  ret = MHD_queue_response (connection, MHD_HTTP_OK, response);
  MHD_destroy_response (response);
  return ret;
}


static int
testWithoutTimeout ()
{
  struct MHD_Daemon *d;
  CURL *c;
  char buf[2048];
  struct CBC cbc;
  unsigned int pos = 0;
  int done_flag = 0;
  CURLcode errornum;
  int port;

  if (MHD_NO != MHD_is_feature_supported (MHD_FEATURE_AUTODETECT_BIND_PORT))
    port = 0;
  else
  {
    port = 1500;
    if (oneone)
      port += 5;
  }

  cbc.buf = buf;
  cbc.size = 2048;
  cbc.pos = 0;
  d = MHD_start_daemon (MHD_USE_INTERNAL_POLLING_THREAD | MHD_USE_ERROR_LOG,
                        port,
                        NULL, NULL, &ahc_echo, &done_flag,
                        MHD_OPTION_CONNECTION_TIMEOUT, 2,
                        MHD_OPTION_NOTIFY_COMPLETED, &termination_cb,
                        &withoutTimeout,
                        MHD_OPTION_END);
  if (d == NULL)
    return 1;
  if (0 == port)
  {
    const union MHD_DaemonInfo *dinfo;
    dinfo = MHD_get_daemon_info (d, MHD_DAEMON_INFO_BIND_PORT);
    if ((NULL == dinfo) || (0 == dinfo->port) )
    {
      MHD_stop_daemon (d); return 32;
    }
    port = (int) dinfo->port;
  }
  c = curl_easy_init ();
  curl_easy_setopt (c, CURLOPT_URL, "http://127.0.0.1/hello_world");
  curl_easy_setopt (c, CURLOPT_PORT, (long) port);
  curl_easy_setopt (c, CURLOPT_WRITEFUNCTION, &copyBuffer);
  curl_easy_setopt (c, CURLOPT_WRITEDATA, &cbc);
  curl_easy_setopt (c, CURLOPT_READFUNCTION, &putBuffer);
  curl_easy_setopt (c, CURLOPT_READDATA, &pos);
  curl_easy_setopt (c, CURLOPT_UPLOAD, 1L);
  curl_easy_setopt (c, CURLOPT_INFILESIZE_LARGE, (curl_off_t) 8L);
  curl_easy_setopt (c, CURLOPT_FAILONERROR, 1L);
  curl_easy_setopt (c, CURLOPT_TIMEOUT, 150L);
  if (oneone)
    curl_easy_setopt (c, CURLOPT_HTTP_VERSION, CURL_HTTP_VERSION_1_1);
  else
    curl_easy_setopt (c, CURLOPT_HTTP_VERSION, CURL_HTTP_VERSION_1_0);
  curl_easy_setopt (c, CURLOPT_CONNECTTIMEOUT, 150L);
  /* NOTE: use of CONNECTTIMEOUT without also
   *   setting NOSIGNAL results in really weird
   *   crashes on my system! */
  curl_easy_setopt (c, CURLOPT_NOSIGNAL, 1L);
  withoutTimeout = 0;
  if (CURLE_OK != (errornum = curl_easy_perform (c)))
  {
    fprintf (stderr, "curl_easy_perform failed: '%s'\n",
             curl_easy_strerror (errornum));
    curl_easy_cleanup (c);
    MHD_stop_daemon (d);
    return 2;
  }
  curl_easy_cleanup (c);
  MHD_stop_daemon (d);
  if (0 == withoutTimeout)
  {
    fprintf (stderr, "Request wasn't processed successfully.\n");
    return 2;
  }
  if (cbc.pos != strlen ("/hello_world"))
    return 4;
  if (0 != strncmp ("/hello_world", cbc.buf, strlen ("/hello_world")))
    return 8;
  return 0;
}


static int
testWithTimeout ()
{
  struct MHD_Daemon *d;
  CURL *c;
  char buf[2048];
  struct CBC cbc;
  int done_flag = 0;
  CURLcode errornum;
  int port;

  if (MHD_NO != MHD_is_feature_supported (MHD_FEATURE_AUTODETECT_BIND_PORT))
    port = 0;
  else
  {
    port = 1501;
    if (oneone)
      port += 5;
  }

  cbc.buf = buf;
  cbc.size = 2048;
  cbc.pos = 0;
  d = MHD_start_daemon (MHD_USE_INTERNAL_POLLING_THREAD | MHD_USE_ERROR_LOG,
                        port,
                        NULL, NULL, &ahc_echo, &done_flag,
                        MHD_OPTION_CONNECTION_TIMEOUT, 2,
                        MHD_OPTION_NOTIFY_COMPLETED, &termination_cb,
                        &withTimeout,
                        MHD_OPTION_END);
  if (d == NULL)
    return 16;
  if (0 == port)
  {
    const union MHD_DaemonInfo *dinfo;
    dinfo = MHD_get_daemon_info (d, MHD_DAEMON_INFO_BIND_PORT);
    if ((NULL == dinfo) || (0 == dinfo->port) )
    {
      MHD_stop_daemon (d); return 32;
    }
    port = (int) dinfo->port;
  }
  c = curl_easy_init ();
  curl_easy_setopt (c, CURLOPT_URL, "http://127.0.0.1/hello_world");
  curl_easy_setopt (c, CURLOPT_PORT, (long) port);
  curl_easy_setopt (c, CURLOPT_WRITEFUNCTION, &copyBuffer);
  curl_easy_setopt (c, CURLOPT_WRITEDATA, &cbc);
  curl_easy_setopt (c, CURLOPT_READFUNCTION, &putBuffer_fail);
  curl_easy_setopt (c, CURLOPT_READDATA, &testWithTimeout);
  curl_easy_setopt (c, CURLOPT_UPLOAD, 1L);
  curl_easy_setopt (c, CURLOPT_INFILESIZE_LARGE, (curl_off_t) 8L);
  curl_easy_setopt (c, CURLOPT_FAILONERROR, 1L);
  curl_easy_setopt (c, CURLOPT_TIMEOUT, 150L);
  if (oneone)
    curl_easy_setopt (c, CURLOPT_HTTP_VERSION, CURL_HTTP_VERSION_1_1);
  else
    curl_easy_setopt (c, CURLOPT_HTTP_VERSION, CURL_HTTP_VERSION_1_0);
  curl_easy_setopt (c, CURLOPT_CONNECTTIMEOUT, 150L);
  /* NOTE: use of CONNECTTIMEOUT without also
   *   setting NOSIGNAL results in really weird
   *   crashes on my system! */
  curl_easy_setopt (c, CURLOPT_NOSIGNAL, 1L);
  withTimeout = 0;
  if (CURLE_OK != (errornum = curl_easy_perform (c)))
  {
    curl_easy_cleanup (c);
    MHD_stop_daemon (d);
    if (errornum == CURLE_GOT_NOTHING)
    {
      if (0 != withTimeout)
      {
        /* mhd had the timeout */
        return 0;
      }
      else
      {
        fprintf (stderr, "Timeout wasn't detected.\n");
        return 8;
      }
    }
    else
      /* curl had the timeout first */
      return 32;
  }
  curl_easy_cleanup (c);
  MHD_stop_daemon (d);
  return 64;
}


int
main (int argc, char *const *argv)
{
  unsigned int errorCount = 0;
  (void) argc;   /* Unused. Silent compiler warning. */

  if ((NULL == argv) || (0 == argv[0]))
    return 99;
  oneone = has_in_name (argv[0], "11");
  if (0 != curl_global_init (CURL_GLOBAL_WIN32))
    return 16;
  errorCount += testWithoutTimeout ();
  errorCount += testWithTimeout ();
  if (errorCount != 0)
    fprintf (stderr,
             "Error during test execution (code: %u)\n",
             errorCount);
  curl_global_cleanup ();
  return (0 == errorCount) ? 0 : 1;       /* 0 == pass */
}