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path: root/src/transport/plugin_transport_http_client.c
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/*
     This file is part of GNUnet
     (C) 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009 Christian Grothoff (and other contributing authors)

     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., 59 Temple Place - Suite 330,
     Boston, MA 02111-1307, USA.
*/

/**
 * @file transport/plugin_transport_http_client.c
 * @brief http transport service plugin
 * @author Matthias Wachs
 */

#include "plugin_transport_http.h"

#if VERBOSE_CLIENT
/**
 * Function to log curl debug messages with GNUNET_log
 * @param curl handle
 * @param type curl_infotype
 * @param data data
 * @param size size
 * @param cls  closure
 * @return 0
 */
static int
client_log (CURL * curl, curl_infotype type, char *data, size_t size, void *cls)
{
  if (type == CURLINFO_TEXT)
  {
    char text[size + 2];

    memcpy (text, data, size);
    if (text[size - 1] == '\n')
      text[size] = '\0';
    else
    {
      text[size] = '\n';
      text[size + 1] = '\0';
    }
    GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Client: %X - %s", cls, text);
  }
  return 0;
}
#endif

int
client_send (struct Session *s, const char *msgbuf, size_t msgbuf_size)
{
  return GNUNET_OK;
}

/**
 * Task performing curl operations
 * @param cls plugin as closure
 * @param tc gnunet scheduler task context
 */
static void
client_run (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc);

/**
 * Function setting up file descriptors and scheduling task to run
 *
 * @param  plugin plugin as closure
 * @return GNUNET_SYSERR for hard failure, GNUNET_OK for ok
 */
static int
client_schedule (struct Plugin *plugin)
{
  fd_set rs;
  fd_set ws;
  fd_set es;
  int max;
  struct GNUNET_NETWORK_FDSet *grs;
  struct GNUNET_NETWORK_FDSet *gws;
  long to;
  CURLMcode mret;
  struct GNUNET_TIME_Relative timeout;

  /* Cancel previous scheduled task */
  if (plugin->client_perform_task!= GNUNET_SCHEDULER_NO_TASK)
  {
    GNUNET_SCHEDULER_cancel (plugin->client_perform_task);
    plugin->client_perform_task = GNUNET_SCHEDULER_NO_TASK;
  }

  max = -1;
  FD_ZERO (&rs);
  FD_ZERO (&ws);
  FD_ZERO (&es);
  mret = curl_multi_fdset (plugin->client_mh, &rs, &ws, &es, &max);
  if (mret != CURLM_OK)
  {
    GNUNET_log (GNUNET_ERROR_TYPE_ERROR, _("%s failed at %s:%d: `%s'\n"),
                "curl_multi_fdset", __FILE__, __LINE__,
                curl_multi_strerror (mret));
    return GNUNET_SYSERR;
  }
  mret = curl_multi_timeout (plugin->client_mh, &to);
  if (to == -1)
    timeout = GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_SECONDS, 5);
  else
    timeout = GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_MILLISECONDS, to);
  if (mret != CURLM_OK)
  {
    GNUNET_log (GNUNET_ERROR_TYPE_ERROR, _("%s failed at %s:%d: `%s'\n"),
                "curl_multi_timeout", __FILE__, __LINE__,
                curl_multi_strerror (mret));
    return GNUNET_SYSERR;
  }

  grs = GNUNET_NETWORK_fdset_create ();
  gws = GNUNET_NETWORK_fdset_create ();
  GNUNET_NETWORK_fdset_copy_native (grs, &rs, max + 1);
  GNUNET_NETWORK_fdset_copy_native (gws, &ws, max + 1);

  plugin->client_perform_task =
      GNUNET_SCHEDULER_add_select (GNUNET_SCHEDULER_PRIORITY_DEFAULT,
                                   GNUNET_SCHEDULER_NO_TASK,
                                   timeout,
                                   grs,
                                   gws,
                                   &client_run,
                                   plugin);
  GNUNET_NETWORK_fdset_destroy (gws);
  GNUNET_NETWORK_fdset_destroy (grs);
  return GNUNET_OK;
}


/**
 * Task performing curl operations
 * @param cls plugin as closure
 * @param tc gnunet scheduler task context
 */
static void
client_run (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
{
  struct Plugin *plugin = cls;
  static unsigned int handles_last_run;
  int running;
  CURLMcode mret;

  GNUNET_assert (cls != NULL);

  plugin->client_perform_task = GNUNET_SCHEDULER_NO_TASK;
  if (0 != (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN))
    return;

  do
  {
    running = 0;
    mret = curl_multi_perform (plugin->client_mh, &running);

    CURLMsg * msg;
    int msgs_left;
    while ((msg = curl_multi_info_read(plugin->client_mh, &msgs_left)))
    {
       CURL *easy_h  = msg->easy_handle;
       struct Session *s;
       GNUNET_assert (easy_h != NULL);

       GNUNET_assert (CURLE_OK == curl_easy_getinfo(easy_h, CURLINFO_PRIVATE, &s));
       GNUNET_assert (s != NULL);

       if (msg->msg == CURLMSG_DONE)
       {
#if DEBUG_HTTP
         GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG, plugin->name,
                   "Connection to '%s'  %s ended\n", GNUNET_i2s(&s->target), http_plugin_address_to_string(plugin, s->addr, s->addrlen));
#endif
         client_disconnect(s);
         notify_session_end (plugin, &s->target, s);
       }
    }

    handles_last_run = running;
  }
  while (mret == CURLM_CALL_MULTI_PERFORM);
  client_schedule (plugin);
}

int
client_disconnect (struct Session *s)
{
  int res = GNUNET_OK;
  CURLMcode mret;
  struct Plugin *plugin = plugin;

#if DEBUG_HTTP
  GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG, plugin->name,
                   "Deleting outbound PUT session to peer `%s'\n",
                   GNUNET_i2s (&s->target));
#endif

  if (s->client_put != NULL)
  {
    mret = curl_multi_remove_handle (plugin->client_mh, s->client_put);
    if (mret != CURLM_OK)
    {
      curl_easy_cleanup (s->client_put);
      res = GNUNET_SYSERR;
      GNUNET_break (0);
    }
    curl_easy_cleanup (s->client_put);
    s->client_put = NULL;
  }

#if DEBUG_HTTP
  GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG, plugin->name,
                   "Deleting outbound GET session to peer `%s'\n",
                   GNUNET_i2s (&s->target));
#endif

  if (s->client_get != NULL)
  {
    mret = curl_multi_remove_handle (plugin->client_mh, s->client_get);
    if (mret != CURLM_OK)
    {
      curl_easy_cleanup (s->client_get);
      res = GNUNET_SYSERR;
      GNUNET_break (0);
    }
    curl_easy_cleanup (s->client_get);
    s->client_get = NULL;
  }

  plugin->cur_connections -= 2;

  /* Re-schedule since handles have changed */
  if (plugin->client_perform_task!= GNUNET_SCHEDULER_NO_TASK)
  {
    GNUNET_SCHEDULER_cancel (plugin->client_perform_task);
    plugin->client_perform_task = GNUNET_SCHEDULER_NO_TASK;
  }
  plugin->client_perform_task = GNUNET_SCHEDULER_add_now(client_run, plugin);

  return res;
}


int
client_connect (struct Session *s)
{
  struct Plugin *plugin = s->plugin;
  int res = GNUNET_OK;
  char *url;
  CURLMcode mret;

#if VERBOSE_CLIENT
  GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG, plugin->name,
                   "Initiating outbound session peer `%s'\n",
                   GNUNET_i2s (&s->target));
#endif

  s->inbound = GNUNET_NO;

  plugin->last_tag++;
  /* create url */
  GNUNET_asprintf (&url, "%s%s;%u", http_plugin_address_to_string (plugin, s->addr, s->addrlen), GNUNET_h2s_full (&plugin->env->my_identity->hashPubKey),plugin->last_tag);
#if 0
  GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG, plugin->name,
                   "URL `%s'\n",
                   url);
#endif
  /* create get connection */
  s->client_get = curl_easy_init ();
#if VERBOSE_CLIENT
  curl_easy_setopt (s->client_get, CURLOPT_VERBOSE, 1L);
  curl_easy_setopt (s->client_get, CURLOPT_DEBUGFUNCTION, &client_log);
  curl_easy_setopt (s->client_get, CURLOPT_DEBUGDATA, s->client_get);
#endif
#if BUILD_HTTPS
  curl_easy_setopt (s->client_get, CURLOPT_SSLVERSION, CURL_SSLVERSION_TLSv1);
  curl_easy_setopt (s->client_get, CURLOPT_SSL_VERIFYPEER, 0);
  curl_easy_setopt (s->client_get, CURLOPT_SSL_VERIFYHOST, 0);
#endif
  curl_easy_setopt (s->client_get, CURLOPT_URL, url);
  //curl_easy_setopt (s->client_get, CURLOPT_HEADERFUNCTION, &curl_get_header_cb);
  //curl_easy_setopt (s->client_get, CURLOPT_WRITEHEADER, ps);
  //curl_easy_setopt (s->client_get, CURLOPT_READFUNCTION, curl_send_cb);
  //curl_easy_setopt (s->client_get, CURLOPT_READDATA, ps);
  //curl_easy_setopt (s->client_get, CURLOPT_WRITEFUNCTION, curl_receive_cb);
  //curl_easy_setopt (s->client_get, CURLOPT_WRITEDATA, ps);
  curl_easy_setopt (s->client_get, CURLOPT_TIMEOUT_MS,
                    (long) GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT.rel_value);
  curl_easy_setopt (s->client_get, CURLOPT_PRIVATE, s);
  curl_easy_setopt (s->client_get, CURLOPT_CONNECTTIMEOUT_MS,
                    (long) HTTP_NOT_VALIDATED_TIMEOUT.rel_value);
  curl_easy_setopt (s->client_get, CURLOPT_BUFFERSIZE,
                    2 * GNUNET_SERVER_MAX_MESSAGE_SIZE);
#if CURL_TCP_NODELAY
  curl_easy_setopt (ps->recv_endpoint, CURLOPT_TCP_NODELAY, 1);
#endif

  /* create put connection */
  s->client_put = curl_easy_init ();
#if VERBOSE_CLIENT
  curl_easy_setopt (s->client_put, CURLOPT_VERBOSE, 1L);
  curl_easy_setopt (s->client_put, CURLOPT_DEBUGFUNCTION, &client_log);
  curl_easy_setopt (s->client_put, CURLOPT_DEBUGDATA, s->client_put);
#endif
#if BUILD_HTTPS
  curl_easy_setopt (s->client_put, CURLOPT_SSLVERSION, CURL_SSLVERSION_TLSv1);
  curl_easy_setopt (s->client_put, CURLOPT_SSL_VERIFYPEER, 0);
  curl_easy_setopt (s->client_put, CURLOPT_SSL_VERIFYHOST, 0);
#endif
  curl_easy_setopt (s->client_put, CURLOPT_URL, url);
  curl_easy_setopt (s->client_put, CURLOPT_PUT, 1L);
  //curl_easy_setopt (s->client_put, CURLOPT_HEADERFUNCTION, &curl_put_header_cb);
  //curl_easy_setopt (s->client_put, CURLOPT_WRITEHEADER, ps);
  //curl_easy_setopt (s->client_put, CURLOPT_READFUNCTION, curl_send_cb);
  //curl_easy_setopt (s->client_put, CURLOPT_READDATA, ps);
  //curl_easy_setopt (s->client_put, CURLOPT_WRITEFUNCTION, curl_receive_cb);
  //curl_easy_setopt (s->client_put, CURLOPT_WRITEDATA, ps);
  curl_easy_setopt (s->client_put, CURLOPT_TIMEOUT_MS,
                    (long) GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT.rel_value);
  curl_easy_setopt (s->client_put, CURLOPT_PRIVATE, s);
  curl_easy_setopt (s->client_put, CURLOPT_CONNECTTIMEOUT_MS,
                    (long) HTTP_NOT_VALIDATED_TIMEOUT.rel_value);
  curl_easy_setopt (s->client_put, CURLOPT_BUFFERSIZE,
                    2 * GNUNET_SERVER_MAX_MESSAGE_SIZE);
#if CURL_TCP_NODELAY
  curl_easy_setopt (s->client_put, CURLOPT_TCP_NODELAY, 1);
#endif

  GNUNET_free (url);

  mret = curl_multi_add_handle (plugin->client_mh, s->client_get);
  if (mret != CURLM_OK)
  {
    curl_easy_cleanup (s->client_get);
    res = GNUNET_SYSERR;
    GNUNET_break (0);
  }

  mret = curl_multi_add_handle (plugin->client_mh, s->client_put);
  if (mret != CURLM_OK)
  {
    curl_multi_remove_handle (plugin->client_mh, s->client_get);
    curl_easy_cleanup (s->client_get);
    curl_easy_cleanup (s->client_put);
    res = GNUNET_SYSERR;
    GNUNET_break (0);
  }

  /* Perform connect */
  plugin->cur_connections += 2;

  /* Re-schedule since handles have changed */
  if (plugin->client_perform_task!= GNUNET_SCHEDULER_NO_TASK)
  {
    GNUNET_SCHEDULER_cancel (plugin->client_perform_task);
    plugin->client_perform_task = GNUNET_SCHEDULER_NO_TASK;
  }
  plugin->client_perform_task = GNUNET_SCHEDULER_add_now (client_run, plugin);

  return res;
}

int
client_start (struct Plugin *plugin)
{
  int res = GNUNET_OK;

  curl_global_init (CURL_GLOBAL_ALL);
  plugin->client_mh = curl_multi_init ();

  if (NULL == plugin->client_mh)
  {
    GNUNET_log_from (GNUNET_ERROR_TYPE_ERROR, plugin->name,
                     _
                     ("Could not initialize curl multi handle, failed to start %s plugin!\n"),
                     plugin->name);
    res = GNUNET_SYSERR;
  }
  return res;
}

void
client_stop (struct Plugin *plugin)
{
  if (plugin->client_perform_task != GNUNET_SCHEDULER_NO_TASK)
  {
    GNUNET_SCHEDULER_cancel (plugin->client_perform_task);
    plugin->client_perform_task = GNUNET_SCHEDULER_NO_TASK;
  }

  curl_multi_cleanup (plugin->client_mh);
  curl_global_cleanup ();
}



/* end of plugin_transport_http_client.c */