src/transport/plugin_transport_http_client.c

   1 /*
   2      This file is part of GNUnet
   3      Copyright (C) 2002-2014 GNUnet e.V.
   4
   5      GNUnet is free software; you can redistribute it and/or modify
   6      it under the terms of the GNU General Public License as published
   7      by the Free Software Foundation; either version 3, or (at your
   8      option) any later version.
   9
  10      GNUnet is distributed in the hope that it will be useful, but
  11      WITHOUT ANY WARRANTY; without even the implied warranty of
  12      MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13      General Public License for more details.
  14
  15      You should have received a copy of the GNU General Public License
  16      along with GNUnet; see the file COPYING.  If not, write to the
  17      Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
  18      Boston, MA 02110-1301, USA.
  19 */
  20
  21 /**
  22  * @file transport/plugin_transport_http_client.c
  23  * @brief HTTP/S client transport plugin
  24  * @author Matthias Wachs
  25  * @author Christian Grothoff
  26  */
  27
  28 #if BUILD_HTTPS
  29 #define PLUGIN_NAME "https_client"
  30 #define HTTP_STAT_STR_CONNECTIONS "# HTTPS client connections"
  31 #define LIBGNUNET_PLUGIN_TRANSPORT_INIT libgnunet_plugin_transport_https_client_init
  32 #define LIBGNUNET_PLUGIN_TRANSPORT_DONE libgnunet_plugin_transport_https_client_done
  33 #else
  34 #define PLUGIN_NAME "http_client"
  35 #define HTTP_STAT_STR_CONNECTIONS "# HTTP client connections"
  36 #define LIBGNUNET_PLUGIN_TRANSPORT_INIT libgnunet_plugin_transport_http_client_init
  37 #define LIBGNUNET_PLUGIN_TRANSPORT_DONE libgnunet_plugin_transport_http_client_done
  38 #endif
  39
  40 #define VERBOSE_CURL GNUNET_NO
  41
  42 #define PUT_DISCONNECT_TIMEOUT GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_SECONDS, 1)
  43
  44 #define ENABLE_PUT GNUNET_YES
  45 #define ENABLE_GET GNUNET_YES
  46
  47 #include "platform.h"
  48 #include "gnunet_util_lib.h"
  49 #include "gnunet_protocols.h"
  50 #include "gnunet_transport_plugin.h"
  51 #include "plugin_transport_http_common.h"
  52 #if HAVE_CURL_CURL_H
  53 #include <curl/curl.h>
  54 #elif HAVE_GNURL_CURL_H
  55 #include <gnurl/curl.h>
  56 #endif
  57
  58
  59 #define LOG(kind,...) GNUNET_log_from(kind, PLUGIN_NAME, __VA_ARGS__)
  60
  61 /**
  62  * Encapsulation of all of the state of the plugin.
  63  */
  64 struct HTTP_Client_Plugin;
  65
  66 /**
  67  * State of a HTTP PUT request
  68  */
  69 enum HTTP_PUT_REQUEST_STATE
  70 {
  71   /**
  72    *  Just created, not yet connected
  73    */
  74   H_NOT_CONNECTED,
  75
  76   /**
  77    *  Connected
  78    */
  79   H_CONNECTED,
  80
  81   /**
  82    *  Paused, nothing to send
  83    */
  84   H_PAUSED,
  85
  86   /**
  87    * Temporary disconnect in progress due to inactivity
  88    */
  89   H_TMP_DISCONNECTING,
  90
  91   /**
  92    * Send request while temporary disconnect, reconnect
  93    */
  94   H_TMP_RECONNECT_REQUIRED,
  95
  96   /**
  97    * Temporarily disconnected
  98    */
  99   H_TMP_DISCONNECTED,
 100
 101   /**
 102    * Disconnected
 103    */
 104   H_DISCONNECTED
 105 };
 106
 107 /**
 108  *  Message to send using http
 109  */
 110 struct HTTP_Message
 111 {
 112   /**
 113    * next pointer for double linked list
 114    */
 115   struct HTTP_Message *next;
 116
 117   /**
 118    * previous pointer for double linked list
 119    */
 120   struct HTTP_Message *prev;
 121
 122   /**
 123    * buffer containing data to send
 124    */
 125   char *buf;
 126
 127   /**
 128    * Continuation function to call once the transmission buffer
 129    * has again space available.  NULL if there is no
 130    * continuation to call.
 131    */
 132   GNUNET_TRANSPORT_TransmitContinuation transmit_cont;
 133
 134   /**
 135    * Closure for @e transmit_cont.
 136    */
 137   void *transmit_cont_cls;
 138
 139   /**
 140    * amount of data already sent
 141    */
 142   size_t pos;
 143
 144   /**
 145    * buffer length
 146    */
 147   size_t size;
 148
 149 };
 150
 151
 152 /**
 153  * Session handle for HTTP(S) connections.
 154  */
 155 struct GNUNET_ATS_Session;
 156
 157
 158 /**
 159  * A request handle
 160  *
 161  */
 162 struct RequestHandle
 163 {
 164   /**
 165    * Current state of this request
 166    */
 167   enum HTTP_PUT_REQUEST_STATE state;
 168
 169   /**
 170    * The curl easy handle
 171    */
 172   CURL *easyhandle;
 173
 174   /**
 175    * The related session
 176    */
 177   struct GNUNET_ATS_Session *s;
 178 };
 179
 180
 181 /**
 182  * Session handle for connections.
 183  */
 184 struct GNUNET_ATS_Session
 185 {
 186   /**
 187    * The URL to connect to
 188    */
 189   char *url;
 190
 191   /**
 192    * Address
 193    */
 194   struct GNUNET_HELLO_Address *address;
 195
 196   /**
 197    * Pointer to the global plugin struct.
 198    */
 199   struct HTTP_Client_Plugin *plugin;
 200
 201   /**
 202    * Handle for the HTTP PUT request.
 203    */
 204   struct RequestHandle put;
 205
 206   /**
 207    * Handle for the HTTP GET request.
 208    */
 209   struct RequestHandle get;
 210
 211   /**
 212    * next pointer for double linked list
 213    */
 214   struct HTTP_Message *msg_head;
 215
 216   /**
 217    * previous pointer for double linked list
 218    */
 219   struct HTTP_Message *msg_tail;
 220
 221   /**
 222    * Message stream tokenizer for incoming data
 223    */
 224   struct GNUNET_SERVER_MessageStreamTokenizer *msg_tk;
 225
 226   /**
 227    * Session timeout task
 228    */
 229   struct GNUNET_SCHEDULER_Task *put_disconnect_task;
 230
 231   /**
 232    * Session timeout task
 233    */
 234   struct GNUNET_SCHEDULER_Task *timeout_task;
 235
 236   /**
 237    * Task to wake up client receive handle when receiving is allowed again
 238    */
 239   struct GNUNET_SCHEDULER_Task *recv_wakeup_task;
 240
 241   /**
 242    * Absolute time when to receive data again.
 243    * Used for receive throttling.
 244    */
 245   struct GNUNET_TIME_Absolute next_receive;
 246
 247   /**
 248    * When does this session time out.
 249    */
 250   struct GNUNET_TIME_Absolute timeout;
 251
 252   /**
 253    * Number of bytes waiting for transmission to this peer.
 254    */
 255   unsigned long long bytes_in_queue;
 256
 257   /**
 258    * Outbound overhead due to HTTP connection
 259    * Add to next message of this session when calling callback
 260    */
 261   size_t overhead;
 262
 263   /**
 264    * Number of messages waiting for transmission to this peer.
 265    */
 266   unsigned int msgs_in_queue;
 267
 268   /**
 269    * ATS network type.
 270    */
 271   enum GNUNET_ATS_Network_Type scope;
 272 };
 273
 274
 275 /**
 276  * Encapsulation of all of the state of the plugin.
 277  */
 278 struct HTTP_Client_Plugin
 279 {
 280   /**
 281    * Our environment.
 282    */
 283   struct GNUNET_TRANSPORT_PluginEnvironment *env;
 284
 285   /**
 286    * Open sessions.
 287    */
 288   struct GNUNET_CONTAINER_MultiPeerMap *sessions;
 289
 290   /**
 291    * Function to call about session status changes.
 292    */
 293   GNUNET_TRANSPORT_SessionInfoCallback sic;
 294
 295   /**
 296    * Closure for @e sic.
 297    */
 298   void *sic_cls;
 299
 300   /**
 301    * Plugin name
 302    */
 303   char *name;
 304
 305   /**
 306    * Protocol
 307    */
 308   char *protocol;
 309
 310   /**
 311    * Proxy configuration: hostname or ip of the proxy server
 312    */
 313   char *proxy_hostname;
 314
 315   /**
 316    * Username for the proxy server
 317    */
 318   char *proxy_username;
 319
 320   /**
 321    * Password for the proxy server
 322    */
 323   char *proxy_password;
 324
 325   /**
 326    * cURL Multihandle
 327    */
 328   CURLM *curl_multi_handle;
 329
 330   /**
 331    * curl perform task
 332    */
 333   struct GNUNET_SCHEDULER_Task * client_perform_task;
 334
 335   /**
 336    * Type of proxy server:
 337    *
 338    * Valid values as supported by curl:
 339    * CURLPROXY_HTTP, CURLPROXY_HTTP_1_0 CURLPROXY_SOCKS4, CURLPROXY_SOCKS5,
 340    * CURLPROXY_SOCKS4A, CURLPROXY_SOCKS5_HOSTNAME
 341    */
 342   curl_proxytype proxytype;
 343
 344   /**
 345    * Use proxy tunneling:
 346    * Tunnel all operations through a given HTTP instead of have the proxy
 347    * evaluate the HTTP request
 348    *
 349    * Default: #GNUNET_NO, #GNUNET_YES experimental
 350    */
 351   int proxy_use_httpproxytunnel;
 352
 353   /**
 354    * My options to be included in the address
 355    */
 356   uint32_t options;
 357
 358   /**
 359    * Maximum number of sockets the plugin can use
 360    * Each http connections are two requests
 361    */
 362   unsigned int max_requests;
 363
 364   /**
 365    * Current number of sockets the plugin can use
 366    * Each http connections are two requests
 367    */
 368   unsigned int cur_requests;
 369
 370   /**
 371    * Last used unique HTTP connection tag
 372    */
 373   uint32_t last_tag;
 374
 375   /**
 376    * use IPv6
 377    */
 378   uint16_t use_ipv6;
 379
 380   /**
 381    * use IPv4
 382    */
 383   uint16_t use_ipv4;
 384
 385   /**
 386    * Should we emulate an XHR client for testing?
 387    */
 388   int emulate_xhr;
 389 };
 390
 391
 392 /**
 393  * Disconnect a session
 394  *
 395  * @param cls the `struct HTTP_Client_Plugin *`
 396  * @param s session
 397  * @return #GNUNET_OK on success, #GNUNET_SYSERR on error
 398  */
 399 static int
 400 http_client_plugin_session_disconnect (void *cls, struct GNUNET_ATS_Session *s);
 401
 402
 403 /**
 404  * If a session monitor is attached, notify it about the new
 405  * session state.
 406  *
 407  * @param plugin our plugin
 408  * @param session session that changed state
 409  * @param state new state of the session
 410  */
 411 static void
 412 notify_session_monitor (struct HTTP_Client_Plugin *plugin,
 413                         struct GNUNET_ATS_Session *session,
 414                         enum GNUNET_TRANSPORT_SessionState state)
 415 {
 416   struct GNUNET_TRANSPORT_SessionInfo info;
 417
 418   if (NULL == plugin->sic)
 419     return;
 420   memset (&info, 0, sizeof (info));
 421   info.state = state;
 422   info.is_inbound = GNUNET_NO;
 423   info.num_msg_pending = session->msgs_in_queue;
 424   info.num_bytes_pending = session->bytes_in_queue;
 425   info.receive_delay = session->next_receive;
 426   info.session_timeout = session->timeout;
 427   info.address = session->address;
 428   plugin->sic (plugin->sic_cls,
 429                session,
 430                &info);
 431 }
 432
 433
 434 /**
 435  * Delete session @a s.
 436  *
 437  * @param s the session to delete
 438  */
 439 static void
 440 client_delete_session (struct GNUNET_ATS_Session *s)
 441 {
 442   struct HTTP_Client_Plugin *plugin = s->plugin;
 443   struct HTTP_Message *pos;
 444   struct HTTP_Message *next;
 445   CURLMcode mret;
 446
 447   if (NULL != s->timeout_task)
 448   {
 449     GNUNET_SCHEDULER_cancel (s->timeout_task);
 450     s->timeout_task = NULL;
 451     s->timeout = GNUNET_TIME_UNIT_ZERO_ABS;
 452   }
 453   if (NULL != s->put_disconnect_task)
 454   {
 455     GNUNET_SCHEDULER_cancel (s->put_disconnect_task);
 456     s->put_disconnect_task = NULL;
 457   }
 458   if (NULL != s->recv_wakeup_task)
 459   {
 460     GNUNET_SCHEDULER_cancel (s->recv_wakeup_task);
 461     s->recv_wakeup_task = NULL;
 462   }
 463   GNUNET_assert (GNUNET_OK ==
 464                  GNUNET_CONTAINER_multipeermap_remove (plugin->sessions,
 465                                                        &s->address->peer,
 466                                                        s));
 467   if (NULL != s->put.easyhandle)
 468   {
 469     LOG (GNUNET_ERROR_TYPE_DEBUG,
 470          "Session %p/request %p: disconnecting PUT request to peer `%s'\n",
 471          s,
 472          s->put.easyhandle,
 473          GNUNET_i2s (&s->address->peer));
 474
 475     /* remove curl handle from multi handle */
 476     mret = curl_multi_remove_handle (plugin->curl_multi_handle,
 477                                      s->put.easyhandle);
 478     GNUNET_break (CURLM_OK == mret);
 479     curl_easy_cleanup (s->put.easyhandle);
 480     GNUNET_assert (plugin->cur_requests > 0);
 481     plugin->cur_requests--;
 482     s->put.easyhandle = NULL;
 483   }
 484   if (NULL != s->get.easyhandle)
 485   {
 486     LOG (GNUNET_ERROR_TYPE_DEBUG,
 487          "Session %p/request %p: disconnecting GET request to peer `%s'\n",
 488          s, s->get.easyhandle,
 489          GNUNET_i2s (&s->address->peer));
 490     /* remove curl handle from multi handle */
 491     mret = curl_multi_remove_handle (plugin->curl_multi_handle,
 492                                      s->get.easyhandle);
 493     GNUNET_break (CURLM_OK == mret);
 494     curl_easy_cleanup (s->get.easyhandle);
 495     GNUNET_assert (plugin->cur_requests > 0);
 496     plugin->cur_requests--;
 497     s->get.easyhandle = NULL;
 498   }
 499
 500   GNUNET_STATISTICS_set (plugin->env->stats,
 501                          HTTP_STAT_STR_CONNECTIONS,
 502                          plugin->cur_requests,
 503                          GNUNET_NO);
 504   next = s->msg_head;
 505   while (NULL != (pos = next))
 506   {
 507     next = pos->next;
 508     GNUNET_CONTAINER_DLL_remove (s->msg_head,
 509                                  s->msg_tail,
 510                                  pos);
 511     GNUNET_assert (0 < s->msgs_in_queue);
 512     s->msgs_in_queue--;
 513     GNUNET_assert (pos->size <= s->bytes_in_queue);
 514     s->bytes_in_queue -= pos->size;
 515     if (NULL != pos->transmit_cont)
 516       pos->transmit_cont (pos->transmit_cont_cls,
 517                           &s->address->peer,
 518                           GNUNET_SYSERR,
 519                           pos->size,
 520                           pos->pos + s->overhead);
 521     s->overhead = 0;
 522     GNUNET_free (pos);
 523   }
 524   GNUNET_assert (0 == s->msgs_in_queue);
 525   GNUNET_assert (0 == s->bytes_in_queue);
 526   notify_session_monitor (plugin,
 527                           s,
 528                           GNUNET_TRANSPORT_SS_DONE);
 529   if (NULL != s->msg_tk)
 530   {
 531     GNUNET_SERVER_mst_destroy (s->msg_tk);
 532     s->msg_tk = NULL;
 533   }
 534   GNUNET_HELLO_address_free (s->address);
 535   GNUNET_free (s->url);
 536   GNUNET_free (s);
 537 }
 538
 539
 540 /**
 541  * Increment session timeout due to activity for session @a s.
 542  *
 543  * @param s the session
 544  */
 545 static void
 546 client_reschedule_session_timeout (struct GNUNET_ATS_Session *s)
 547 {
 548   GNUNET_assert (NULL != s->timeout_task);
 549   s->timeout = GNUNET_TIME_relative_to_absolute (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT);
 550 }
 551
 552
 553 /**
 554  * Task performing curl operations
 555  *
 556  * @param cls plugin as closure
 557  * @param tc gnunet scheduler task context
 558  */
 559 static void
 560 client_run (void *cls);
 561
 562
 563 /**
 564  * Function setting up file descriptors and scheduling task to run
 565  *
 566  * @param plugin the plugin as closure
 567  * @param now schedule task in 1ms, regardless of what curl may say
 568  * @return #GNUNET_SYSERR for hard failure, #GNUNET_OK for ok
 569  */
 570 static int
 571 client_schedule (struct HTTP_Client_Plugin *plugin,
 572                  int now)
 573 {
 574   fd_set rs;
 575   fd_set ws;
 576   fd_set es;
 577   int max;
 578   struct GNUNET_NETWORK_FDSet *grs;
 579   struct GNUNET_NETWORK_FDSet *gws;
 580   long to;
 581   CURLMcode mret;
 582   struct GNUNET_TIME_Relative timeout;
 583
 584   /* Cancel previous scheduled task */
 585   if (plugin->client_perform_task != NULL)
 586   {
 587     GNUNET_SCHEDULER_cancel (plugin->client_perform_task);
 588     plugin->client_perform_task = NULL;
 589   }
 590   max = -1;
 591   FD_ZERO (&rs);
 592   FD_ZERO (&ws);
 593   FD_ZERO (&es);
 594   mret = curl_multi_fdset (plugin->curl_multi_handle, &rs, &ws, &es, &max);
 595   if (mret != CURLM_OK)
 596   {
 597     LOG (GNUNET_ERROR_TYPE_ERROR,
 598          _("%s failed at %s:%d: `%s'\n"),
 599          "curl_multi_fdset",
 600          __FILE__,
 601          __LINE__,
 602          curl_multi_strerror (mret));
 603     return GNUNET_SYSERR;
 604   }
 605   mret = curl_multi_timeout (plugin->curl_multi_handle, &to);
 606   if (-1 == to)
 607     timeout = GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_SECONDS, 1);
 608   else
 609     timeout = GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_MILLISECONDS, to);
 610   if (now == GNUNET_YES)
 611     timeout = GNUNET_TIME_UNIT_MILLISECONDS;
 612
 613   if (CURLM_OK != mret)
 614   {
 615     LOG (GNUNET_ERROR_TYPE_ERROR,
 616                 _("%s failed at %s:%d: `%s'\n"),
 617                 "curl_multi_timeout", __FILE__, __LINE__,
 618                 curl_multi_strerror (mret));
 619     return GNUNET_SYSERR;
 620   }
 621
 622   grs = GNUNET_NETWORK_fdset_create ();
 623   gws = GNUNET_NETWORK_fdset_create ();
 624   GNUNET_NETWORK_fdset_copy_native (grs, &rs, max + 1);
 625   GNUNET_NETWORK_fdset_copy_native (gws, &ws, max + 1);
 626
 627   /* Schedule task to run when select is ready to read or write */
 628   plugin->client_perform_task =
 629       GNUNET_SCHEDULER_add_select (GNUNET_SCHEDULER_PRIORITY_DEFAULT,
 630                                    timeout, grs, gws,
 631                                    &client_run, plugin);
 632   GNUNET_NETWORK_fdset_destroy (gws);
 633   GNUNET_NETWORK_fdset_destroy (grs);
 634   return GNUNET_OK;
 635 }
 636
 637
 638 #if VERBOSE_CURL
 639 /**
 640  * Loggging function
 641  *
 642  * @param curl the curl easy handle
 643  * @param type message type
 644  * @param data data to log, NOT a 0-terminated string
 645  * @param size data length
 646  * @param cls the closure
 647  * @return always 0
 648  */
 649 static int
 650 client_log (CURL *curl,
 651             curl_infotype type,
 652             const char *data,
 653             size_t size,
 654             void *cls)
 655 {
 656   struct RequestHandle *ch = cls;
 657   const char *ttype = "UNSPECIFIED";
 658   char text[size + 2];
 659
 660   if (! ((CURLINFO_TEXT == type) ||
 661          (CURLINFO_HEADER_IN == type) ||
 662          (CURLINFO_HEADER_OUT == type)))
 663     return 0;
 664   switch (type)
 665   {
 666   case CURLINFO_TEXT:
 667     ttype = "TEXT";
 668     break;
 669   case CURLINFO_HEADER_IN:
 670     ttype = "HEADER_IN";
 671     break;
 672   case CURLINFO_HEADER_OUT:
 673     ttype = "HEADER_OUT";
 674     /* Overhead*/
 675     GNUNET_assert (NULL != ch);
 676     GNUNET_assert (NULL != ch->easyhandle);
 677     GNUNET_assert (NULL != ch->s);
 678     ch->s->overhead += size;
 679     break;
 680   default:
 681     ttype = "UNSPECIFIED";
 682     break;
 683   }
 684   GNUNET_memcpy (text, data, size);
 685   if (text[size - 1] == '\n')
 686   {
 687     text[size] = '\0';
 688   }
 689   else
 690   {
 691     text[size] = '\n';
 692     text[size + 1] = '\0';
 693   }
 694   LOG (GNUNET_ERROR_TYPE_DEBUG,
 695        "Request %p %s: %s",
 696        ch->easyhandle,
 697        ttype,
 698        text);
 699   return 0;
 700 }
 701 #endif
 702
 703 /**
 704  * Connect GET request
 705  *
 706  * @param s the session to connect
 707  * @return #GNUNET_OK on success, #GNUNET_SYSERR otherwise
 708  */
 709 static int
 710 client_connect_get (struct GNUNET_ATS_Session *s);
 711
 712
 713 /**
 714  * Connect a HTTP put request
 715  *
 716  * @param s the session to connect
 717  * @return #GNUNET_SYSERR for hard failure, #GNUNET_OK for success
 718  */
 719 static int
 720 client_connect_put (struct GNUNET_ATS_Session *s);
 721
 722
 723 /**
 724  * Function that can be used by the transport service to transmit
 725  * a message using the plugin.   Note that in the case of a
 726  * peer disconnecting, the continuation MUST be called
 727  * prior to the disconnect notification itself.  This function
 728  * will be called with this peer's HELLO message to initiate
 729  * a fresh connection to another peer.
 730  *
 731  * @param cls closure
 732  * @param s which session must be used
 733  * @param msgbuf the message to transmit
 734  * @param msgbuf_size number of bytes in @a msgbuf
 735  * @param priority how important is the message (most plugins will
 736  *                 ignore message priority and just FIFO)
 737  * @param to how long to wait at most for the transmission (does not
 738  *                require plugins to discard the message after the timeout,
 739  *                just advisory for the desired delay; most plugins will ignore
 740  *                this as well)
 741  * @param cont continuation to call once the message has
 742  *        been transmitted (or if the transport is ready
 743  *        for the next transmission call; or if the
 744  *        peer disconnected...); can be NULL
 745  * @param cont_cls closure for @a cont
 746  * @return number of bytes used (on the physical network, with overheads);
 747  *         -1 on hard errors (i.e. address invalid); 0 is a legal value
 748  *         and does NOT mean that the message was not transmitted (DV)
 749  */
 750 static ssize_t
 751 http_client_plugin_send (void *cls,
 752                          struct GNUNET_ATS_Session *s,
 753                          const char *msgbuf,
 754                          size_t msgbuf_size,
 755                          unsigned int priority,
 756                          struct GNUNET_TIME_Relative to,
 757                          GNUNET_TRANSPORT_TransmitContinuation cont,
 758                          void *cont_cls)
 759 {
 760   struct HTTP_Client_Plugin *plugin = cls;
 761   struct HTTP_Message *msg;
 762   char *stat_txt;
 763
 764   LOG (GNUNET_ERROR_TYPE_DEBUG,
 765        "Session %p/request %p: Sending message with %u to peer `%s' \n",
 766        s,
 767        s->put.easyhandle,
 768        msgbuf_size,
 769        GNUNET_i2s (&s->address->peer));
 770
 771   /* create new message and schedule */
 772   msg = GNUNET_malloc (sizeof (struct HTTP_Message) + msgbuf_size);
 773   msg->size = msgbuf_size;
 774   msg->buf = (char *) &msg[1];
 775   msg->transmit_cont = cont;
 776   msg->transmit_cont_cls = cont_cls;
 777   GNUNET_memcpy (msg->buf,
 778           msgbuf,
 779           msgbuf_size);
 780   GNUNET_CONTAINER_DLL_insert_tail (s->msg_head,
 781                                     s->msg_tail,
 782                                     msg);
 783   s->msgs_in_queue++;
 784   s->bytes_in_queue += msg->size;
 785
 786   GNUNET_asprintf (&stat_txt,
 787                    "# bytes currently in %s_client buffers",
 788                    plugin->protocol);
 789   GNUNET_STATISTICS_update (plugin->env->stats,
 790                             stat_txt, msgbuf_size, GNUNET_NO);
 791   GNUNET_free (stat_txt);
 792   notify_session_monitor (plugin,
 793                           s,
 794                           GNUNET_TRANSPORT_SS_UPDATE);
 795   if (H_TMP_DISCONNECTING == s->put.state)
 796   {
 797     /* PUT request is currently getting disconnected */
 798     s->put.state = H_TMP_RECONNECT_REQUIRED;
 799     LOG (GNUNET_ERROR_TYPE_DEBUG,
 800          "Session %p/request %p: currently disconnecting, reconnecting immediately\n",
 801          s,
 802          s->put.easyhandle);
 803     return msgbuf_size;
 804   }
 805   if (H_PAUSED == s->put.state)
 806   {
 807     /* PUT request was paused, unpause */
 808     GNUNET_assert (s->put_disconnect_task != NULL);
 809     GNUNET_SCHEDULER_cancel (s->put_disconnect_task);
 810     s->put_disconnect_task = NULL;
 811     LOG (GNUNET_ERROR_TYPE_DEBUG,
 812          "Session %p/request %p: unpausing request\n",
 813          s, s->put.easyhandle);
 814     s->put.state = H_CONNECTED;
 815     if (NULL != s->put.easyhandle)
 816       curl_easy_pause (s->put.easyhandle, CURLPAUSE_CONT);
 817   }
 818   else if (H_TMP_DISCONNECTED == s->put.state)
 819   {
 820     /* PUT request was disconnected, reconnect */
 821     LOG (GNUNET_ERROR_TYPE_DEBUG, "Session %p: Reconnecting PUT request\n", s);
 822     GNUNET_break (NULL == s->put.easyhandle);
 823     if (GNUNET_SYSERR == client_connect_put (s))
 824     {
 825       /* Could not reconnect */
 826       http_client_plugin_session_disconnect (plugin, s);
 827       return GNUNET_SYSERR;
 828     }
 829   }
 830   client_schedule (s->plugin, GNUNET_YES);
 831   return msgbuf_size;
 832 }
 833
 834
 835 /**
 836  * Disconnect a session
 837  *
 838  * @param cls the `struct HTTP_Client_Plugin *`
 839  * @param s session
 840  * @return #GNUNET_OK on success, #GNUNET_SYSERR on error
 841  */
 842 static int
 843 http_client_plugin_session_disconnect (void *cls,
 844                                        struct GNUNET_ATS_Session *s)
 845 {
 846   struct HTTP_Client_Plugin *plugin = cls;
 847
 848   LOG (GNUNET_ERROR_TYPE_DEBUG,
 849        "Session %p: notifying transport about ending session\n",
 850        s);
 851   plugin->env->session_end (plugin->env->cls,
 852                             s->address,
 853                             s);
 854   client_delete_session (s);
 855
 856   /* Re-schedule since handles have changed */
 857   if (NULL != plugin->client_perform_task)
 858   {
 859     GNUNET_SCHEDULER_cancel (plugin->client_perform_task);
 860     plugin->client_perform_task = NULL;
 861   }
 862   client_schedule (plugin, GNUNET_YES);
 863
 864   return GNUNET_OK;
 865 }
 866
 867
 868 /**
 869  * Function that is called to get the keepalive factor.
 870  * #GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT is divided by this number to
 871  * calculate the interval between keepalive packets.
 872  *
 873  * @param cls closure with the `struct Plugin`
 874  * @return keepalive factor
 875  */
 876 static unsigned int
 877 http_client_query_keepalive_factor (void *cls)
 878 {
 879   return 3;
 880 }
 881
 882
 883 /**
 884  * Callback to destroys all sessions on exit.
 885  *
 886  * @param cls the `struct HTTP_Client_Plugin *`
 887  * @param peer identity of the peer
 888  * @param value the `struct GNUNET_ATS_Session *`
 889  * @return #GNUNET_OK (continue iterating)
 890  */
 891 static int
 892 destroy_session_cb (void *cls,
 893                     const struct GNUNET_PeerIdentity *peer,
 894                     void *value)
 895 {
 896   struct HTTP_Client_Plugin *plugin = cls;
 897   struct GNUNET_ATS_Session *session = value;
 898
 899   http_client_plugin_session_disconnect (plugin, session);
 900   return GNUNET_OK;
 901 }
 902
 903
 904 /**
 905  * Function that can be used to force the plugin to disconnect
 906  * from the given peer and cancel all previous transmissions
 907  * (and their continuationc).
 908  *
 909  * @param cls closure
 910  * @param target peer from which to disconnect
 911  */
 912 static void
 913 http_client_plugin_peer_disconnect (void *cls,
 914                                     const struct GNUNET_PeerIdentity *target)
 915 {
 916   struct HTTP_Client_Plugin *plugin = cls;
 917
 918   LOG (GNUNET_ERROR_TYPE_DEBUG,
 919        "Transport tells me to disconnect `%s'\n",
 920        GNUNET_i2s (target));
 921   GNUNET_CONTAINER_multipeermap_get_multiple (plugin->sessions,
 922                                               target,
 923                                               &destroy_session_cb,
 924                                               plugin);
 925 }
 926
 927
 928 /**
 929  * Closure for #session_lookup_client_by_address().
 930  */
 931 struct GNUNET_ATS_SessionClientCtx
 932 {
 933   /**
 934    * Address we are looking for.
 935    */
 936   const struct GNUNET_HELLO_Address *address;
 937
 938   /**
 939    * Session that was found.
 940    */
 941   struct GNUNET_ATS_Session *ret;
 942 };
 943
 944
 945 /**
 946  * Locate the seession object for a given address.
 947  *
 948  * @param cls the `struct GNUNET_ATS_SessionClientCtx *`
 949  * @param key peer identity
 950  * @param value the `struct GNUNET_ATS_Session` to check
 951  * @return #GNUNET_NO if found, #GNUNET_OK if not
 952  */
 953 static int
 954 session_lookup_client_by_address (void *cls,
 955                                   const struct GNUNET_PeerIdentity *key,
 956                                   void *value)
 957 {
 958   struct GNUNET_ATS_SessionClientCtx *sc_ctx = cls;
 959   struct GNUNET_ATS_Session *s = value;
 960
 961   if (0 == GNUNET_HELLO_address_cmp (sc_ctx->address,
 962                                      s->address))
 963   {
 964     sc_ctx->ret = s;
 965     return GNUNET_NO;
 966   }
 967   return GNUNET_YES;
 968 }
 969
 970
 971 /**
 972  * Check if a sessions exists for an specific address
 973  *
 974  * @param plugin the plugin
 975  * @param address the address
 976  * @return the session or NULL
 977  */
 978 static struct GNUNET_ATS_Session *
 979 client_lookup_session (struct HTTP_Client_Plugin *plugin,
 980                        const struct GNUNET_HELLO_Address *address)
 981 {
 982   struct GNUNET_ATS_SessionClientCtx sc_ctx;
 983
 984   sc_ctx.address = address;
 985   sc_ctx.ret = NULL;
 986   GNUNET_CONTAINER_multipeermap_iterate (plugin->sessions,
 987                                          &session_lookup_client_by_address,
 988                                          &sc_ctx);
 989   return sc_ctx.ret;
 990 }
 991
 992
 993 /**
 994  * When we have nothing to transmit, we pause the HTTP PUT
 995  * after a while (so that gnurl stops asking).  This task
 996  * is the delayed task that actually disconnects the PUT.
 997  *
 998  * @param cls the `struct GNUNET_ATS_Session *` with the put
 999  */
1000 static void
1001 client_put_disconnect (void *cls)
1002 {
1003   struct GNUNET_ATS_Session *s = cls;
1004
1005   s->put_disconnect_task = NULL;
1006   LOG (GNUNET_ERROR_TYPE_DEBUG,
1007        "Session %p/request %p: will be disconnected due to no activity\n",
1008        s, s->put.easyhandle);
1009   s->put.state = H_TMP_DISCONNECTING;
1010   if (NULL != s->put.easyhandle)
1011     curl_easy_pause (s->put.easyhandle,
1012                      CURLPAUSE_CONT);
1013   client_schedule (s->plugin, GNUNET_YES);
1014 }
1015
1016
1017 /**
1018  * Callback method used with libcurl
1019  * Method is called when libcurl needs to read data during sending
1020  *
1021  * @param stream pointer where to write data
1022  * @param size size of an individual element
1023  * @param nmemb count of elements that can be written to the buffer
1024  * @param cls our `struct GNUNET_ATS_Session`
1025  * @return bytes written to stream, returning 0 will terminate request!
1026  */
1027 static size_t
1028 client_send_cb (void *stream,
1029                 size_t size,
1030                 size_t nmemb,
1031                 void *cls)
1032 {
1033   struct GNUNET_ATS_Session *s = cls;
1034   struct HTTP_Client_Plugin *plugin = s->plugin;
1035   struct HTTP_Message *msg = s->msg_head;
1036   size_t len;
1037   char *stat_txt;
1038
1039   if (H_TMP_DISCONNECTING == s->put.state)
1040   {
1041     LOG (GNUNET_ERROR_TYPE_DEBUG,
1042          "Session %p/request %p: disconnect due to inactivity\n",
1043          s, s->put.easyhandle);
1044     return 0;
1045   }
1046
1047   if (NULL == msg)
1048   {
1049     if (GNUNET_YES == plugin->emulate_xhr)
1050     {
1051       LOG (GNUNET_ERROR_TYPE_DEBUG,
1052            "Session %p/request %p: PUT request finished\n",
1053            s,
1054            s->put.easyhandle);
1055       s->put.state = H_TMP_DISCONNECTING;
1056       return 0;
1057     }
1058
1059     /* We have nothing to send, so pause PUT request */
1060     LOG (GNUNET_ERROR_TYPE_DEBUG,
1061          "Session %p/request %p: nothing to send, suspending\n",
1062          s,
1063          s->put.easyhandle);
1064     s->put_disconnect_task
1065       = GNUNET_SCHEDULER_add_delayed (PUT_DISCONNECT_TIMEOUT,
1066                                       &client_put_disconnect,
1067                                       s);
1068     s->put.state = H_PAUSED;
1069     return CURL_READFUNC_PAUSE;
1070   }
1071   /* data to send */
1072   GNUNET_assert (msg->pos < msg->size);
1073   /* calculate how much fits in buffer */
1074   len = GNUNET_MIN (msg->size - msg->pos,
1075                     size * nmemb);
1076   GNUNET_memcpy (stream,
1077                  &msg->buf[msg->pos],
1078                  len);
1079   msg->pos += len;
1080   if (msg->pos == msg->size)
1081   {
1082     LOG (GNUNET_ERROR_TYPE_DEBUG,
1083          "Session %p/request %p: sent message with %u bytes sent, removing message from queue\n",
1084          s,
1085          s->put.easyhandle,
1086          msg->size,
1087          msg->pos);
1088     /* Calling transmit continuation  */
1089     GNUNET_CONTAINER_DLL_remove (s->msg_head,
1090                                  s->msg_tail,
1091                                  msg);
1092     GNUNET_assert (0 < s->msgs_in_queue);
1093     s->msgs_in_queue--;
1094     GNUNET_assert (msg->size <= s->bytes_in_queue);
1095     s->bytes_in_queue -= msg->size;
1096     if (NULL != msg->transmit_cont)
1097       msg->transmit_cont (msg->transmit_cont_cls,
1098                           &s->address->peer,
1099                           GNUNET_OK,
1100                           msg->size,
1101                           msg->size + s->overhead);
1102     s->overhead = 0;
1103     GNUNET_free (msg);
1104   }
1105   notify_session_monitor (plugin,
1106                           s,
1107                           GNUNET_TRANSPORT_SS_UPDATE);
1108   GNUNET_asprintf (&stat_txt,
1109                    "# bytes currently in %s_client buffers",
1110                    plugin->protocol);
1111   GNUNET_STATISTICS_update (plugin->env->stats,
1112                             stat_txt,
1113                             - len,
1114                             GNUNET_NO);
1115   GNUNET_free (stat_txt);
1116   GNUNET_asprintf (&stat_txt,
1117                    "# bytes transmitted via %s_client",
1118                    plugin->protocol);
1119   GNUNET_STATISTICS_update (plugin->env->stats,
1120                             stat_txt,
1121                             len,
1122                             GNUNET_NO);
1123   GNUNET_free (stat_txt);
1124   return len;
1125 }
1126
1127
1128 /**
1129  * Wake up a curl handle which was suspended
1130  *
1131  * @param cls the session
1132  */
1133 static void
1134 client_wake_up (void *cls)
1135 {
1136   struct GNUNET_ATS_Session *s = cls;
1137
1138   s->recv_wakeup_task = NULL;
1139   LOG (GNUNET_ERROR_TYPE_DEBUG,
1140        "Session %p/request %p: Waking up GET handle\n",
1141        s, s->get.easyhandle);
1142   if (H_PAUSED == s->put.state)
1143   {
1144     /* PUT request was paused, unpause */
1145     GNUNET_assert (s->put_disconnect_task != NULL);
1146     GNUNET_SCHEDULER_cancel (s->put_disconnect_task);
1147     s->put_disconnect_task = NULL;
1148     s->put.state = H_CONNECTED;
1149     if (NULL != s->put.easyhandle)
1150       curl_easy_pause (s->put.easyhandle, CURLPAUSE_CONT);
1151   }
1152   if (NULL != s->get.easyhandle)
1153     curl_easy_pause (s->get.easyhandle, CURLPAUSE_CONT);
1154 }
1155
1156
1157 /**
1158  * Callback for message stream tokenizer
1159  *
1160  * @param cls the session
1161  * @param client not used
1162  * @param message the message received
1163  * @return always #GNUNET_OK
1164  */
1165 static int
1166 client_receive_mst_cb (void *cls,
1167                        void *client,
1168                        const struct GNUNET_MessageHeader *message)
1169 {
1170   struct GNUNET_ATS_Session *s = cls;
1171   struct HTTP_Client_Plugin *plugin;
1172   struct GNUNET_TIME_Relative delay;
1173   char *stat_txt;
1174
1175   plugin = s->plugin;
1176   delay = s->plugin->env->receive (plugin->env->cls,
1177                                    s->address,
1178                                    s,
1179                                    message);
1180   GNUNET_asprintf (&stat_txt,
1181                    "# bytes received via %s_client",
1182                    plugin->protocol);
1183   GNUNET_STATISTICS_update (plugin->env->stats,
1184                             stat_txt,
1185                             ntohs (message->size),
1186                             GNUNET_NO);
1187   GNUNET_free (stat_txt);
1188
1189   s->next_receive = GNUNET_TIME_relative_to_absolute (delay);
1190   if (GNUNET_TIME_absolute_get ().abs_value_us < s->next_receive.abs_value_us)
1191   {
1192     LOG (GNUNET_ERROR_TYPE_DEBUG,
1193          "Client: peer `%s' address `%s' next read delayed for %s\n",
1194          GNUNET_i2s (&s->address->peer),
1195          http_common_plugin_address_to_string (s->plugin->protocol,
1196                                                s->address->address,
1197                                                s->address->address_length),
1198          GNUNET_STRINGS_relative_time_to_string (delay,
1199                                                  GNUNET_YES));
1200   }
1201   client_reschedule_session_timeout (s);
1202   return GNUNET_OK;
1203 }
1204
1205
1206 /**
1207  * Callback method used with libcurl when data for a PUT request are
1208  * received.  We do not expect data here, so we just discard it.
1209  *
1210  * @param stream pointer where to write data
1211  * @param size size of an individual element
1212  * @param nmemb count of elements that can be written to the buffer
1213  * @param cls destination pointer, passed to the libcurl handle
1214  * @return bytes read from stream
1215  */
1216 static size_t
1217 client_receive_put (void *stream,
1218                     size_t size,
1219                     size_t nmemb,
1220                     void *cls)
1221 {
1222   return size * nmemb;
1223 }
1224
1225
1226 /**
1227  * Callback method used with libcurl when data for a GET request are
1228  * received. Forward to MST
1229  *
1230  * @param stream pointer where to write data
1231  * @param size size of an individual element
1232  * @param nmemb count of elements that can be written to the buffer
1233  * @param cls destination pointer, passed to the libcurl handle
1234  * @return bytes read from stream
1235  */
1236 static size_t
1237 client_receive (void *stream,
1238                 size_t size,
1239                 size_t nmemb,
1240                 void *cls)
1241 {
1242   struct GNUNET_ATS_Session *s = cls;
1243   struct GNUNET_TIME_Absolute now;
1244   size_t len = size * nmemb;
1245
1246   LOG (GNUNET_ERROR_TYPE_DEBUG,
1247        "Session %p / request %p: Received %u bytes from peer `%s'\n",
1248        s,
1249        s->get.easyhandle,
1250        len,
1251        GNUNET_i2s (&s->address->peer));
1252   now = GNUNET_TIME_absolute_get ();
1253   if (now.abs_value_us < s->next_receive.abs_value_us)
1254   {
1255     struct GNUNET_TIME_Absolute now = GNUNET_TIME_absolute_get ();
1256     struct GNUNET_TIME_Relative delta
1257       = GNUNET_TIME_absolute_get_difference (now, s->next_receive);
1258
1259     LOG (GNUNET_ERROR_TYPE_DEBUG,
1260          "Session %p / request %p: No inbound bandwidth available! Next read was delayed for %s\n",
1261          s,
1262          s->get.easyhandle,
1263          GNUNET_STRINGS_relative_time_to_string (delta,
1264                                                  GNUNET_YES));
1265     if (s->recv_wakeup_task != NULL)
1266     {
1267       GNUNET_SCHEDULER_cancel (s->recv_wakeup_task);
1268       s->recv_wakeup_task = NULL;
1269     }
1270     s->recv_wakeup_task
1271       = GNUNET_SCHEDULER_add_delayed (delta,
1272                                       &client_wake_up,
1273                                       s);
1274     return CURL_WRITEFUNC_PAUSE;
1275   }
1276   if (NULL == s->msg_tk)
1277     s->msg_tk = GNUNET_SERVER_mst_create (&client_receive_mst_cb,
1278                                           s);
1279   GNUNET_SERVER_mst_receive (s->msg_tk,
1280                              s,
1281                              stream,
1282                              len,
1283                              GNUNET_NO,
1284                              GNUNET_NO);
1285   return len;
1286 }
1287
1288
1289 /**
1290  * Task performing curl operations
1291  *
1292  * @param cls plugin as closure
1293  */
1294 static void
1295 client_run (void *cls)
1296 {
1297   struct HTTP_Client_Plugin *plugin = cls;
1298   int running;
1299   long http_statuscode;
1300   CURLMcode mret;
1301   CURLMsg *msg;
1302   int put_request; /* GNUNET_YES if easy handle is put, GNUNET_NO for get */
1303   int msgs_left;
1304
1305   plugin->client_perform_task = NULL;
1306   /* While data are available or timeouts occured */
1307   do
1308   {
1309     running = 0;
1310     /* Perform operations for all handles */
1311     mret = curl_multi_perform (plugin->curl_multi_handle, &running);
1312
1313     /* Get additional information for all handles */
1314     while (NULL != (msg = curl_multi_info_read (plugin->curl_multi_handle, &msgs_left)))
1315     {
1316       CURL *easy_h = msg->easy_handle;
1317       struct GNUNET_ATS_Session *s = NULL;
1318       char *d = NULL; /* curl requires 'd' to be a 'char *' */
1319
1320       GNUNET_assert (NULL != easy_h);
1321
1322       /* Obtain session from easy handle */
1323       GNUNET_assert (CURLE_OK == curl_easy_getinfo (easy_h, CURLINFO_PRIVATE, &d));
1324       s = (struct GNUNET_ATS_Session *) d;
1325       GNUNET_assert (NULL != s);
1326
1327       if (msg->msg != CURLMSG_DONE)
1328         continue; /* This should not happen */
1329
1330       /* Get HTTP response code */
1331       GNUNET_break (CURLE_OK == curl_easy_getinfo (easy_h,
1332           CURLINFO_RESPONSE_CODE, &http_statuscode));
1333
1334       if (easy_h == s->put.easyhandle)
1335         put_request = GNUNET_YES;
1336       else
1337         put_request = GNUNET_NO;
1338
1339       /* Log status of terminated request */
1340       if  ((0 != msg->data.result) || (http_statuscode != 200))
1341         LOG (GNUNET_ERROR_TYPE_DEBUG,
1342              "Session %p/request %p: %s request to `%s' ended with status %i reason %i: `%s'\n",
1343              s, msg->easy_handle,
1344              (GNUNET_YES == put_request) ? "PUT" : "GET",
1345              GNUNET_i2s (&s->address->peer),
1346              http_statuscode,
1347              msg->data.result,
1348              curl_easy_strerror (msg->data.result));
1349       else
1350         LOG (GNUNET_ERROR_TYPE_DEBUG,
1351              "Session %p/request %p: %s request to `%s' ended normal\n",
1352              s, msg->easy_handle,
1353              (GNUNET_YES == put_request) ? "PUT" : "GET",
1354              GNUNET_i2s (&s->address->peer));
1355
1356       /* Remove easy handle from multi handle */
1357       curl_multi_remove_handle (plugin->curl_multi_handle, easy_h);
1358
1359       /* Clean up easy handle */
1360       curl_easy_cleanup (easy_h);
1361
1362       /* Remove information */
1363       GNUNET_assert (plugin->cur_requests > 0);
1364       plugin->cur_requests--;
1365       LOG  (GNUNET_ERROR_TYPE_INFO,
1366           "%s request to %s done, number of requests decreased to %u\n",
1367           (GNUNET_YES == put_request) ? "PUT" : "GET",
1368           s->url,
1369           plugin->cur_requests);
1370
1371       if (GNUNET_YES == put_request)
1372       {
1373         /* Clean up a PUT request */
1374         s->put.easyhandle = NULL;
1375         s->put.s = NULL;
1376
1377         switch (s->put.state) {
1378           case H_NOT_CONNECTED:
1379           case H_DISCONNECTED:
1380           case H_TMP_DISCONNECTED:
1381             /* This must not happen */
1382             GNUNET_break (0);
1383             break;
1384           case H_TMP_RECONNECT_REQUIRED:
1385             /* Transport called send while disconnect in progess, reconnect */
1386             if (GNUNET_SYSERR == client_connect_put (s))
1387             {
1388               /* Reconnect failed, disconnect session */
1389               http_client_plugin_session_disconnect (plugin, s);
1390             }
1391             break;
1392           case H_TMP_DISCONNECTING:
1393             /* PUT gets temporarily disconnected */
1394             s->put.state = H_TMP_DISCONNECTED;
1395             break;
1396           case H_PAUSED:
1397           case H_CONNECTED:
1398             /* PUT gets permanently disconnected */
1399             s->put.state = H_DISCONNECTED;
1400             http_client_plugin_session_disconnect (plugin, s);
1401             break;
1402           default:
1403             GNUNET_break (0);
1404             break;
1405         }
1406       }
1407       else if (GNUNET_NO == put_request)
1408       {
1409         /* Clean up a GET request */
1410         s->get.easyhandle = NULL;
1411         s->get.s = NULL;
1412
1413         /* If we are emulating an XHR client we need to make another GET
1414          * request.
1415          */
1416         if (GNUNET_YES == plugin->emulate_xhr)
1417         {
1418           if (GNUNET_SYSERR == client_connect_get (s))
1419             http_client_plugin_session_disconnect (plugin, s);
1420         }
1421         else
1422         {
1423           /* GET request was terminated, so disconnect session */
1424           http_client_plugin_session_disconnect (plugin, s);
1425         }
1426       }
1427       else
1428         GNUNET_break (0); /* Must not happen */
1429
1430       GNUNET_STATISTICS_set (plugin->env->stats,
1431                              HTTP_STAT_STR_CONNECTIONS,
1432                              plugin->cur_requests,
1433                              GNUNET_NO);
1434     }
1435   }
1436   while (mret == CURLM_CALL_MULTI_PERFORM);
1437   client_schedule (plugin, GNUNET_NO);
1438 }
1439
1440
1441 #ifdef TCP_STEALTH
1442 /**
1443  * Open TCP socket with TCP STEALTH enabled.
1444  *
1445  * @param clientp our `struct GNUNET_ATS_Session *`
1446  * @param purpose why does curl want to open a socket
1447  * @param address what kind of socket does curl want to have opened?
1448  * @return opened socket
1449  */
1450 static curl_socket_t
1451 open_tcp_stealth_socket_cb (void *clientp,
1452                             curlsocktype purpose,
1453                             struct curl_sockaddr *address)
1454 {
1455   struct GNUNET_ATS_Session *s = clientp;
1456   int ret;
1457
1458   switch (purpose)
1459   {
1460   case CURLSOCKTYPE_IPCXN:
1461     ret = socket (address->family,
1462                   address->socktype,
1463                   address->protocol);
1464     if (-1 == ret)
1465       return CURL_SOCKET_BAD;
1466     if ( ( (SOCK_STREAM != address->socktype) ||
1467            ( (0 != address->protocol) &&
1468              (IPPROTO_TCP != address->protocol))) )
1469       return (curl_socket_t) ret;
1470     if ( (0 != setsockopt (ret,
1471                            IPPROTO_TCP,
1472                            TCP_STEALTH,
1473                            &s->address->peer,
1474                            sizeof (struct GNUNET_PeerIdentity))) )
1475     {
1476       GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
1477                   _("TCP_STEALTH not supported on this platform.\n"));
1478       (void) close (ret);
1479       return CURL_SOCKET_BAD;
1480     }
1481     return (curl_socket_t) ret;
1482   case CURLSOCKTYPE_ACCEPT:
1483     GNUNET_break (0);
1484     return CURL_SOCKET_BAD;
1485     break;
1486   case CURLSOCKTYPE_LAST:
1487     GNUNET_break (0);
1488     return CURL_SOCKET_BAD;
1489   default:
1490     GNUNET_break (0);
1491     return CURL_SOCKET_BAD;
1492   }
1493 }
1494 #endif
1495
1496
1497 /**
1498  * Connect GET request for a session
1499  *
1500  * @param s the session to connect
1501  * @return #GNUNET_OK on success, #GNUNET_SYSERR otherwise
1502  */
1503 static int
1504 client_connect_get (struct GNUNET_ATS_Session *s)
1505 {
1506   CURLMcode mret;
1507   struct HttpAddress *ha;
1508   uint32_t options;
1509
1510   ha = (struct HttpAddress *) s->address->address;
1511   options = ntohl (ha->options);
1512   /* create get request */
1513   s->get.easyhandle = curl_easy_init ();
1514   s->get.s = s;
1515   if (0 != (options & HTTP_OPTIONS_TCP_STEALTH))
1516   {
1517 #ifdef TCP_STEALTH
1518     curl_easy_setopt (s->get.easyhandle,
1519                       CURLOPT_OPENSOCKETFUNCTION,
1520                       &open_tcp_stealth_socket_cb);
1521     curl_easy_setopt (s->get.easyhandle,
1522                       CURLOPT_OPENSOCKETDATA,
1523                       s);
1524 #else
1525     GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1526                 "Cannot connect, TCP STEALTH needed and not supported by kernel.\n");
1527     curl_easy_cleanup (s->get.easyhandle);
1528     s->get.easyhandle = NULL;
1529     s->get.s = NULL;
1530     return GNUNET_SYSERR;
1531 #endif
1532   }
1533
1534 #if VERBOSE_CURL
1535   curl_easy_setopt (s->get.easyhandle,
1536                     CURLOPT_VERBOSE,
1537                     1L);
1538   curl_easy_setopt (s->get.easyhandle,
1539                     CURLOPT_DEBUGFUNCTION,
1540                     &client_log);
1541   curl_easy_setopt (s->get.easyhandle,
1542                     CURLOPT_DEBUGDATA,
1543                     &s->get);
1544 #endif
1545 #if BUILD_HTTPS
1546   curl_easy_setopt (s->get.easyhandle, CURLOPT_SSLVERSION, CURL_SSLVERSION_TLSv1);
1547   {
1548     if (HTTP_OPTIONS_VERIFY_CERTIFICATE ==
1549         (options & HTTP_OPTIONS_VERIFY_CERTIFICATE))
1550     {
1551       curl_easy_setopt (s->get.easyhandle,
1552                         CURLOPT_SSL_VERIFYPEER, 1L);
1553       curl_easy_setopt (s->get.easyhandle,
1554                         CURLOPT_SSL_VERIFYHOST,
1555                         2L);
1556     }
1557     else
1558     {
1559       curl_easy_setopt (s->get.easyhandle,
1560                         CURLOPT_SSL_VERIFYPEER,
1561                         0L);
1562       curl_easy_setopt (s->get.easyhandle,
1563                         CURLOPT_SSL_VERIFYHOST,
1564                         0L);
1565     }
1566   }
1567   curl_easy_setopt (s->get.easyhandle,
1568                     CURLOPT_PROTOCOLS,
1569                     CURLPROTO_HTTPS);
1570   curl_easy_setopt (s->get.easyhandle,
1571                     CURLOPT_REDIR_PROTOCOLS,
1572                     CURLPROTO_HTTPS);
1573 #else
1574   curl_easy_setopt (s->get.easyhandle,
1575                     CURLOPT_PROTOCOLS,
1576                     CURLPROTO_HTTP);
1577   curl_easy_setopt (s->get.easyhandle,
1578                     CURLOPT_REDIR_PROTOCOLS,
1579                     CURLPROTO_HTTP);
1580 #endif
1581
1582   if (NULL != s->plugin->proxy_hostname)
1583   {
1584     curl_easy_setopt (s->get.easyhandle,
1585                       CURLOPT_PROXY,
1586                       s->plugin->proxy_hostname);
1587     curl_easy_setopt (s->get.easyhandle,
1588                       CURLOPT_PROXYTYPE,
1589                       s->plugin->proxytype);
1590     if (NULL != s->plugin->proxy_username)
1591       curl_easy_setopt (s->get.easyhandle,
1592                         CURLOPT_PROXYUSERNAME,
1593                         s->plugin->proxy_username);
1594     if (NULL != s->plugin->proxy_password)
1595       curl_easy_setopt (s->get.easyhandle,
1596                         CURLOPT_PROXYPASSWORD,
1597                         s->plugin->proxy_password);
1598     if (GNUNET_YES == s->plugin->proxy_use_httpproxytunnel)
1599       curl_easy_setopt (s->get.easyhandle,
1600                         CURLOPT_HTTPPROXYTUNNEL,
1601                         s->plugin->proxy_use_httpproxytunnel);
1602   }
1603
1604   if (GNUNET_YES == s->plugin->emulate_xhr)
1605   {
1606     char *url;
1607
1608     GNUNET_asprintf (&url,
1609                      "%s,1",
1610                      s->url);
1611     curl_easy_setopt (s->get.easyhandle,
1612                       CURLOPT_URL,
1613                       url);
1614     GNUNET_free(url);
1615   }
1616   else
1617   {
1618     curl_easy_setopt (s->get.easyhandle,
1619                       CURLOPT_URL,
1620                       s->url);
1621   }
1622   curl_easy_setopt (s->get.easyhandle,
1623                     CURLOPT_READFUNCTION,
1624                     &client_send_cb);
1625   curl_easy_setopt (s->get.easyhandle,
1626                     CURLOPT_READDATA,
1627                     s);
1628   curl_easy_setopt (s->get.easyhandle,
1629                     CURLOPT_WRITEFUNCTION,
1630                     &client_receive);
1631   curl_easy_setopt (s->get.easyhandle,
1632                     CURLOPT_WRITEDATA,
1633                     s);
1634   /* No timeout by default, timeout done with session timeout */
1635   curl_easy_setopt (s->get.easyhandle,
1636                     CURLOPT_TIMEOUT,
1637                     0L);
1638   curl_easy_setopt (s->get.easyhandle,
1639                     CURLOPT_PRIVATE, s);
1640   curl_easy_setopt (s->get.easyhandle,
1641                     CURLOPT_CONNECTTIMEOUT_MS,
1642                     (long) (HTTP_CLIENT_NOT_VALIDATED_TIMEOUT.rel_value_us / 1000LL));
1643   curl_easy_setopt (s->get.easyhandle, CURLOPT_BUFFERSIZE,
1644                     2 * GNUNET_SERVER_MAX_MESSAGE_SIZE);
1645 #if CURL_TCP_NODELAY
1646   curl_easy_setopt (ps->recv_endpoint,
1647                     CURLOPT_TCP_NODELAY,
1648                     1L);
1649 #endif
1650   curl_easy_setopt (s->get.easyhandle,
1651                     CURLOPT_FOLLOWLOCATION,
1652                     0L);
1653
1654   mret = curl_multi_add_handle (s->plugin->curl_multi_handle,
1655                                 s->get.easyhandle);
1656   if (CURLM_OK != mret)
1657   {
1658     LOG (GNUNET_ERROR_TYPE_ERROR,
1659          "Session %p : Failed to add GET handle to multihandle: `%s'\n",
1660          s,
1661          curl_multi_strerror (mret));
1662     curl_easy_cleanup (s->get.easyhandle);
1663     s->get.easyhandle = NULL;
1664     s->get.s = NULL;
1665     GNUNET_break (0);
1666     return GNUNET_SYSERR;
1667   }
1668   s->plugin->cur_requests++;
1669   LOG (GNUNET_ERROR_TYPE_INFO,
1670        "GET request `%s' established, number of requests increased to %u\n",
1671        s->url,
1672        s->plugin->cur_requests);
1673   return GNUNET_OK;
1674 }
1675
1676
1677 /**
1678  * Connect a HTTP put request
1679  *
1680  * @param s the session to connect
1681  * @return #GNUNET_SYSERR for hard failure, #GNUNET_OK for ok
1682  */
1683 static int
1684 client_connect_put (struct GNUNET_ATS_Session *s)
1685 {
1686   CURLMcode mret;
1687   struct HttpAddress *ha;
1688   uint32_t options;
1689
1690   ha = (struct HttpAddress *) s->address->address;
1691   options = ntohl (ha->options);
1692   /* create put request */
1693   LOG (GNUNET_ERROR_TYPE_DEBUG,
1694        "Session %p: Init PUT handle\n",
1695        s);
1696   s->put.easyhandle = curl_easy_init ();
1697   s->put.s = s;
1698 #if VERBOSE_CURL
1699   curl_easy_setopt (s->put.easyhandle,
1700                     CURLOPT_VERBOSE,
1701                     1L);
1702   curl_easy_setopt (s->put.easyhandle,
1703                     CURLOPT_DEBUGFUNCTION,
1704                     &client_log);
1705   curl_easy_setopt (s->put.easyhandle,
1706                     CURLOPT_DEBUGDATA,
1707                     &s->put);
1708 #endif
1709   if (0 != (options & HTTP_OPTIONS_TCP_STEALTH))
1710   {
1711 #ifdef TCP_STEALTH
1712     curl_easy_setopt (s->put.easyhandle,
1713                       CURLOPT_OPENSOCKETFUNCTION,
1714                       &open_tcp_stealth_socket_cb);
1715     curl_easy_setopt (s->put.easyhandle,
1716                       CURLOPT_OPENSOCKETDATA,
1717                       s);
1718 #else
1719     GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1720                 "Cannot connect, TCP STEALTH needed and not supported by kernel.\n");
1721     curl_easy_cleanup (s->put.easyhandle);
1722     s->put.easyhandle = NULL;
1723     s->put.s = NULL;
1724     s->put.state = H_DISCONNECTED;
1725     return GNUNET_SYSERR;
1726 #endif
1727   }
1728 #if BUILD_HTTPS
1729   curl_easy_setopt (s->put.easyhandle,
1730                     CURLOPT_SSLVERSION,
1731                     CURL_SSLVERSION_TLSv1);
1732   {
1733     struct HttpAddress *ha;
1734     ha = (struct HttpAddress *) s->address->address;
1735
1736     if (HTTP_OPTIONS_VERIFY_CERTIFICATE ==
1737         (ntohl (ha->options) & HTTP_OPTIONS_VERIFY_CERTIFICATE))
1738     {
1739       curl_easy_setopt (s->put.easyhandle,
1740                         CURLOPT_SSL_VERIFYPEER,
1741                         1L);
1742       curl_easy_setopt (s->put.easyhandle,
1743                         CURLOPT_SSL_VERIFYHOST,
1744                         2L);
1745     }
1746     else
1747     {
1748       curl_easy_setopt (s->put.easyhandle,
1749                         CURLOPT_SSL_VERIFYPEER,
1750                         0L);
1751       curl_easy_setopt (s->put.easyhandle,
1752                         CURLOPT_SSL_VERIFYHOST,
1753                         0L);
1754     }
1755   }
1756   curl_easy_setopt (s->put.easyhandle,
1757                     CURLOPT_PROTOCOLS,
1758                     CURLPROTO_HTTPS);
1759   curl_easy_setopt (s->put.easyhandle,
1760                     CURLOPT_REDIR_PROTOCOLS,
1761                     CURLPROTO_HTTPS);
1762 #else
1763   curl_easy_setopt (s->put.easyhandle,
1764                     CURLOPT_PROTOCOLS,
1765                     CURLPROTO_HTTP);
1766   curl_easy_setopt (s->put.easyhandle,
1767                     CURLOPT_REDIR_PROTOCOLS,
1768                     CURLPROTO_HTTP);
1769 #endif
1770   if (NULL != s->plugin->proxy_hostname)
1771   {
1772     curl_easy_setopt (s->put.easyhandle,
1773                       CURLOPT_PROXY,
1774                       s->plugin->proxy_hostname);
1775     curl_easy_setopt (s->put.easyhandle,
1776                       CURLOPT_PROXYTYPE,
1777                       s->plugin->proxytype);
1778     if (NULL != s->plugin->proxy_username)
1779       curl_easy_setopt (s->put.easyhandle,
1780                         CURLOPT_PROXYUSERNAME,
1781                         s->plugin->proxy_username);
1782     if (NULL != s->plugin->proxy_password)
1783       curl_easy_setopt (s->put.easyhandle,
1784                         CURLOPT_PROXYPASSWORD,
1785                         s->plugin->proxy_password);
1786     if (GNUNET_YES == s->plugin->proxy_use_httpproxytunnel)
1787       curl_easy_setopt (s->put.easyhandle,
1788                         CURLOPT_HTTPPROXYTUNNEL,
1789                         s->plugin->proxy_use_httpproxytunnel);
1790   }
1791
1792   curl_easy_setopt (s->put.easyhandle,
1793                     CURLOPT_URL,
1794                     s->url);
1795   curl_easy_setopt (s->put.easyhandle,
1796                     CURLOPT_UPLOAD,
1797                     1L);
1798   curl_easy_setopt (s->put.easyhandle,
1799                     CURLOPT_READFUNCTION,
1800                     &client_send_cb);
1801   curl_easy_setopt (s->put.easyhandle,
1802                     CURLOPT_READDATA,
1803                     s);
1804   curl_easy_setopt (s->put.easyhandle,
1805                     CURLOPT_WRITEFUNCTION,
1806                     &client_receive_put);
1807   curl_easy_setopt (s->put.easyhandle,
1808                     CURLOPT_WRITEDATA,
1809                     s);
1810   /* No timeout by default, timeout done with session timeout */
1811   curl_easy_setopt (s->put.easyhandle,
1812                     CURLOPT_TIMEOUT,
1813                     0L);
1814   curl_easy_setopt (s->put.easyhandle,
1815                     CURLOPT_PRIVATE,
1816                     s);
1817   curl_easy_setopt (s->put.easyhandle,
1818                     CURLOPT_CONNECTTIMEOUT_MS,
1819                     (long) (HTTP_CLIENT_NOT_VALIDATED_TIMEOUT.rel_value_us / 1000LL));
1820   curl_easy_setopt (s->put.easyhandle, CURLOPT_BUFFERSIZE,
1821                     2 * GNUNET_SERVER_MAX_MESSAGE_SIZE);
1822 #if CURL_TCP_NODELAY
1823   curl_easy_setopt (s->put.easyhandle, CURLOPT_TCP_NODELAY, 1);
1824 #endif
1825   mret = curl_multi_add_handle (s->plugin->curl_multi_handle,
1826                                 s->put.easyhandle);
1827   if (CURLM_OK != mret)
1828   {
1829     LOG (GNUNET_ERROR_TYPE_ERROR,
1830          "Session %p : Failed to add PUT handle to multihandle: `%s'\n",
1831          s, curl_multi_strerror (mret));
1832     curl_easy_cleanup (s->put.easyhandle);
1833     s->put.easyhandle = NULL;
1834     s->put.s = NULL;
1835     s->put.state = H_DISCONNECTED;
1836     return GNUNET_SYSERR;
1837   }
1838   s->put.state = H_CONNECTED;
1839   s->plugin->cur_requests++;
1840
1841   LOG  (GNUNET_ERROR_TYPE_INFO,
1842       "PUT request `%s' established, number of requests increased to %u\n",
1843       s->url, s->plugin->cur_requests);
1844
1845   return GNUNET_OK;
1846 }
1847
1848
1849 /**
1850  * Connect both PUT and GET request for a session
1851  *
1852  * @param s the session to connect
1853  * @return #GNUNET_OK on success, #GNUNET_SYSERR otherwise
1854  */
1855 static int
1856 client_connect (struct GNUNET_ATS_Session *s)
1857 {
1858   struct HTTP_Client_Plugin *plugin = s->plugin;
1859   int res = GNUNET_OK;
1860
1861   /* create url */
1862   if (NULL ==
1863       http_common_plugin_address_to_string(plugin->protocol,
1864                                            s->address->address,
1865                                            s->address->address_length))
1866   {
1867     LOG (GNUNET_ERROR_TYPE_DEBUG,
1868          "Invalid address peer `%s'\n",
1869          GNUNET_i2s(&s->address->peer));
1870     return GNUNET_SYSERR;
1871   }
1872
1873   GNUNET_asprintf (&s->url,
1874                    "%s/%s;%u",
1875                    http_common_plugin_address_to_url (NULL,
1876                                                       s->address->address,
1877                                                       s->address->address_length),
1878                    GNUNET_i2s_full (plugin->env->my_identity),
1879                    plugin->last_tag);
1880
1881   plugin->last_tag++;
1882   LOG (GNUNET_ERROR_TYPE_DEBUG,
1883        "Initiating outbound session peer `%s' using address `%s'\n",
1884        GNUNET_i2s (&s->address->peer), s->url);
1885
1886   if (GNUNET_SYSERR == client_connect_get (s))
1887     return GNUNET_SYSERR;
1888   /* If we are emulating an XHR client then delay sending a PUT request until
1889    * there is something to send.
1890    */
1891   if (GNUNET_YES == plugin->emulate_xhr)
1892   {
1893     s->put.state = H_TMP_DISCONNECTED;
1894   }
1895   else if (GNUNET_SYSERR == client_connect_put (s))
1896     return GNUNET_SYSERR;
1897
1898   LOG (GNUNET_ERROR_TYPE_DEBUG,
1899        "Session %p: connected with GET %p and PUT %p\n",
1900        s, s->get.easyhandle,
1901        s->put.easyhandle);
1902   /* Perform connect */
1903   GNUNET_STATISTICS_set (plugin->env->stats,
1904                          HTTP_STAT_STR_CONNECTIONS,
1905                          plugin->cur_requests,
1906                          GNUNET_NO);
1907   /* Re-schedule since handles have changed */
1908   if (NULL != plugin->client_perform_task)
1909   {
1910     GNUNET_SCHEDULER_cancel (plugin->client_perform_task);
1911     plugin->client_perform_task = NULL;
1912   }
1913
1914   /* Schedule task to run immediately */
1915   plugin->client_perform_task = GNUNET_SCHEDULER_add_now (client_run,
1916                                                           plugin);
1917   return res;
1918 }
1919
1920
1921 /**
1922  * Function obtain the network type for a session
1923  *
1924  * @param cls closure (`struct Plugin*`)
1925  * @param session the session
1926  * @return the network type
1927  */
1928 static enum GNUNET_ATS_Network_Type
1929 http_client_plugin_get_network (void *cls,
1930                                 struct GNUNET_ATS_Session *session)
1931 {
1932   return session->scope;
1933 }
1934
1935
1936 /**
1937  * Function obtain the network type for an address.
1938  *
1939  * @param cls closure (`struct Plugin *`)
1940  * @param address the address
1941  * @return the network type
1942  */
1943 static enum GNUNET_ATS_Network_Type
1944 http_client_plugin_get_network_for_address (void *cls,
1945                                             const struct GNUNET_HELLO_Address *address)
1946 {
1947   struct HTTP_Client_Plugin *plugin = cls;
1948
1949   return http_common_get_network_for_address (plugin->env,
1950                                               address);
1951 }
1952
1953
1954 /**
1955  * Session was idle, so disconnect it
1956  *
1957  * @param cls the `struct GNUNET_ATS_Session` of the idle session
1958  */
1959 static void
1960 client_session_timeout (void *cls)
1961 {
1962   struct GNUNET_ATS_Session *s = cls;
1963   struct GNUNET_TIME_Relative left;
1964
1965   s->timeout_task = NULL;
1966   left = GNUNET_TIME_absolute_get_remaining (s->timeout);
1967   if (0 != left.rel_value_us)
1968   {
1969     /* not actually our turn yet, but let's at least update
1970        the monitor, it may think we're about to die ... */
1971     notify_session_monitor (s->plugin,
1972                             s,
1973                             GNUNET_TRANSPORT_SS_UPDATE);
1974     s->timeout_task = GNUNET_SCHEDULER_add_delayed (left,
1975                                                     &client_session_timeout,
1976                                                     s);
1977     return;
1978   }
1979   LOG (TIMEOUT_LOG,
1980        "Session %p was idle for %s, disconnecting\n",
1981        s,
1982        GNUNET_STRINGS_relative_time_to_string (HTTP_CLIENT_SESSION_TIMEOUT,
1983                                                GNUNET_YES));
1984   GNUNET_assert (GNUNET_OK ==
1985                  http_client_plugin_session_disconnect (s->plugin,
1986                                                  s));
1987 }
1988
1989
1990 /**
1991  * Creates a new outbound session the transport service will use to
1992  * send data to the peer
1993  *
1994  * @param cls the plugin
1995  * @param address the address
1996  * @return the session or NULL of max connections exceeded
1997  */
1998 static struct GNUNET_ATS_Session *
1999 http_client_plugin_get_session (void *cls,
2000                                 const struct GNUNET_HELLO_Address *address)
2001 {
2002   struct HTTP_Client_Plugin *plugin = cls;
2003   struct GNUNET_ATS_Session *s;
2004   struct sockaddr *sa;
2005   enum GNUNET_ATS_Network_Type net_type;
2006   size_t salen = 0;
2007   int res;
2008
2009   GNUNET_assert (NULL != address->address);
2010
2011   /* find existing session */
2012   s = client_lookup_session (plugin, address);
2013   if (NULL != s)
2014     return s;
2015
2016   /* create a new session */
2017   if (plugin->max_requests <= plugin->cur_requests)
2018   {
2019     LOG (GNUNET_ERROR_TYPE_WARNING,
2020          "Maximum number of requests (%u) reached: "
2021          "cannot connect to peer `%s'\n",
2022          plugin->max_requests,
2023          GNUNET_i2s (&address->peer));
2024     return NULL;
2025   }
2026
2027   /* Determine network location */
2028   net_type = GNUNET_ATS_NET_UNSPECIFIED;
2029   sa = http_common_socket_from_address (address->address,
2030                                         address->address_length,
2031                                         &res);
2032   if (GNUNET_SYSERR == res)
2033     return NULL;
2034   if (GNUNET_YES == res)
2035   {
2036     GNUNET_assert (NULL != sa);
2037     if (AF_INET == sa->sa_family)
2038     {
2039       salen = sizeof (struct sockaddr_in);
2040     }
2041     else if (AF_INET6 == sa->sa_family)
2042     {
2043       salen = sizeof (struct sockaddr_in6);
2044     }
2045     net_type = plugin->env->get_address_type (plugin->env->cls, sa, salen);
2046     GNUNET_free (sa);
2047   }
2048   else if (GNUNET_NO == res)
2049   {
2050     /* Cannot convert to sockaddr -> is external hostname */
2051     net_type = GNUNET_ATS_NET_WAN;
2052   }
2053   if (GNUNET_ATS_NET_UNSPECIFIED == net_type)
2054   {
2055     GNUNET_break (0);
2056     return NULL;
2057   }
2058
2059   s = GNUNET_new (struct GNUNET_ATS_Session);
2060   s->plugin = plugin;
2061   s->address = GNUNET_HELLO_address_copy (address);
2062   s->scope = net_type;
2063
2064   s->put.state = H_NOT_CONNECTED;
2065   s->timeout = GNUNET_TIME_relative_to_absolute (HTTP_CLIENT_SESSION_TIMEOUT);
2066   s->timeout_task =  GNUNET_SCHEDULER_add_delayed (HTTP_CLIENT_SESSION_TIMEOUT,
2067                                                    &client_session_timeout,
2068                                                    s);
2069   LOG (GNUNET_ERROR_TYPE_DEBUG,
2070        "Created new session %p for `%s' address `%s''\n",
2071        s,
2072        http_common_plugin_address_to_string (plugin->protocol,
2073                                              s->address->address,
2074                                              s->address->address_length),
2075        GNUNET_i2s (&s->address->peer));
2076
2077   /* add new session */
2078   (void) GNUNET_CONTAINER_multipeermap_put (plugin->sessions,
2079                                             &s->address->peer,
2080                                             s,
2081                                             GNUNET_CONTAINER_MULTIHASHMAPOPTION_MULTIPLE);
2082   /* initiate new connection */
2083   if (GNUNET_SYSERR == client_connect (s))
2084   {
2085     LOG (GNUNET_ERROR_TYPE_ERROR,
2086          "Cannot connect to peer `%s' address `%s''\n",
2087          http_common_plugin_address_to_string (plugin->protocol,
2088              s->address->address, s->address->address_length),
2089              GNUNET_i2s (&s->address->peer));
2090     client_delete_session (s);
2091     return NULL;
2092   }
2093   notify_session_monitor (plugin,
2094                           s,
2095                           GNUNET_TRANSPORT_SS_INIT);
2096   notify_session_monitor (plugin,
2097                           s,
2098                           GNUNET_TRANSPORT_SS_UP); /* or handshake? */
2099   return s;
2100 }
2101
2102
2103 /**
2104  * Setup http_client plugin
2105  *
2106  * @param plugin the plugin handle
2107  * @return #GNUNET_OK on success, #GNUNET_SYSERR on error
2108  */
2109 static int
2110 client_start (struct HTTP_Client_Plugin *plugin)
2111 {
2112   curl_global_init (CURL_GLOBAL_ALL);
2113   plugin->curl_multi_handle = curl_multi_init ();
2114
2115   if (NULL == plugin->curl_multi_handle)
2116   {
2117     LOG (GNUNET_ERROR_TYPE_ERROR,
2118          _("Could not initialize curl multi handle, failed to start %s plugin!\n"),
2119          plugin->name);
2120     return GNUNET_SYSERR;
2121   }
2122   return GNUNET_OK;
2123 }
2124
2125
2126 /**
2127  * Another peer has suggested an address for this
2128  * peer and transport plugin.  Check that this could be a valid
2129  * address.  If so, consider adding it to the list
2130  * of addresses.
2131  *
2132  * @param cls closure with the `struct Plugin`
2133  * @param addr pointer to the address
2134  * @param addrlen length of @a addr
2135  * @return #GNUNET_OK if this is a plausible address for this peer
2136  *         and transport; always returns #GNUNET_NO (this is the client!)
2137  */
2138 static int
2139 http_client_plugin_address_suggested (void *cls,
2140                                       const void *addr,
2141                                       size_t addrlen)
2142 {
2143   /* A HTTP/S client does not have any valid address so:*/
2144   return GNUNET_NO;
2145 }
2146
2147
2148 /**
2149  * Exit point from the plugin.
2150  *
2151  * @param cls api as closure
2152  * @return NULL
2153  */
2154 void *
2155 LIBGNUNET_PLUGIN_TRANSPORT_DONE (void *cls)
2156 {
2157   struct GNUNET_TRANSPORT_PluginFunctions *api = cls;
2158   struct HTTP_Client_Plugin *plugin = api->cls;
2159
2160   if (NULL == api->cls)
2161   {
2162     /* Stub shutdown */
2163     GNUNET_free (api);
2164     return NULL;
2165   }
2166   LOG (GNUNET_ERROR_TYPE_DEBUG,
2167        _("Shutting down plugin `%s'\n"),
2168        plugin->name);
2169   GNUNET_CONTAINER_multipeermap_iterate (plugin->sessions,
2170                                          &destroy_session_cb,
2171                                          plugin);
2172   if (NULL != plugin->client_perform_task)
2173   {
2174     GNUNET_SCHEDULER_cancel (plugin->client_perform_task);
2175     plugin->client_perform_task = NULL;
2176   }
2177   if (NULL != plugin->curl_multi_handle)
2178   {
2179     curl_multi_cleanup (plugin->curl_multi_handle);
2180     plugin->curl_multi_handle = NULL;
2181   }
2182   curl_global_cleanup ();
2183   LOG (GNUNET_ERROR_TYPE_DEBUG,
2184        _("Shutdown for plugin `%s' complete\n"),
2185        plugin->name);
2186   GNUNET_CONTAINER_multipeermap_destroy (plugin->sessions);
2187   GNUNET_free_non_null (plugin->proxy_hostname);
2188   GNUNET_free_non_null (plugin->proxy_username);
2189   GNUNET_free_non_null (plugin->proxy_password);
2190   GNUNET_free (plugin);
2191   GNUNET_free (api);
2192   return NULL;
2193 }
2194
2195
2196 /**
2197  * Configure plugin
2198  *
2199  * @param plugin the plugin handle
2200  * @return #GNUNET_OK on success, #GNUNET_SYSERR on failure
2201  */
2202 static int
2203 client_configure_plugin (struct HTTP_Client_Plugin *plugin)
2204 {
2205   unsigned long long max_requests;
2206   char *proxy_type;
2207
2208   /* Optional parameters */
2209   if (GNUNET_OK !=
2210       GNUNET_CONFIGURATION_get_value_number (plugin->env->cfg,
2211                                              plugin->name,
2212                                              "MAX_CONNECTIONS",
2213                                              &max_requests))
2214     max_requests = 128;
2215   plugin->max_requests = max_requests;
2216
2217   LOG (GNUNET_ERROR_TYPE_DEBUG,
2218        _("Maximum number of requests is %u\n"),
2219        plugin->max_requests);
2220
2221   /* Read proxy configuration */
2222   if (GNUNET_OK ==
2223       GNUNET_CONFIGURATION_get_value_string (plugin->env->cfg,
2224                                              plugin->name,
2225                                              "PROXY",
2226                                              &plugin->proxy_hostname))
2227   {
2228     LOG (GNUNET_ERROR_TYPE_DEBUG,
2229          "Found proxy host: `%s'\n",
2230          plugin->proxy_hostname);
2231     /* proxy username */
2232     if (GNUNET_OK ==
2233         GNUNET_CONFIGURATION_get_value_string (plugin->env->cfg,
2234                                                plugin->name,
2235                                                "PROXY_USERNAME",
2236                                                &plugin->proxy_username))
2237     {
2238       LOG (GNUNET_ERROR_TYPE_DEBUG,
2239            "Found proxy username name: `%s'\n",
2240            plugin->proxy_username);
2241     }
2242
2243     /* proxy password */
2244     if (GNUNET_OK ==
2245         GNUNET_CONFIGURATION_get_value_string (plugin->env->cfg,
2246                                                plugin->name,
2247                                                "PROXY_PASSWORD",
2248                                                &plugin->proxy_password))
2249     {
2250       LOG (GNUNET_ERROR_TYPE_DEBUG,
2251            "Found proxy password name: `%s'\n",
2252            plugin->proxy_password);
2253     }
2254
2255     /* proxy type */
2256     if (GNUNET_OK ==
2257         GNUNET_CONFIGURATION_get_value_string (plugin->env->cfg,
2258                                                plugin->name,
2259                                                "PROXY_TYPE",
2260                                                &proxy_type))
2261     {
2262       GNUNET_STRINGS_utf8_toupper (proxy_type, proxy_type);
2263
2264       if (0 == strcmp(proxy_type, "HTTP"))
2265         plugin->proxytype = CURLPROXY_HTTP;
2266       else if (0 == strcmp(proxy_type, "SOCKS4"))
2267         plugin->proxytype = CURLPROXY_SOCKS4;
2268       else if (0 == strcmp(proxy_type, "SOCKS5"))
2269         plugin->proxytype = CURLPROXY_SOCKS5;
2270       else if (0 == strcmp(proxy_type, "SOCKS4A"))
2271         plugin->proxytype = CURLPROXY_SOCKS4A;
2272       else if (0 == strcmp(proxy_type, "SOCKS5_HOSTNAME "))
2273         plugin->proxytype = CURLPROXY_SOCKS5_HOSTNAME ;
2274       else
2275       {
2276         LOG (GNUNET_ERROR_TYPE_ERROR,
2277              _("Invalid proxy type: `%s', disabling proxy! Check configuration!\n"),
2278              proxy_type);
2279
2280         GNUNET_free (proxy_type);
2281         GNUNET_free (plugin->proxy_hostname);
2282         plugin->proxy_hostname = NULL;
2283         GNUNET_free_non_null (plugin->proxy_username);
2284         plugin->proxy_username = NULL;
2285         GNUNET_free_non_null (plugin->proxy_password);
2286         plugin->proxy_password = NULL;
2287
2288         return GNUNET_SYSERR;
2289       }
2290
2291       LOG (GNUNET_ERROR_TYPE_DEBUG,
2292            "Found proxy type: `%s'\n",
2293            proxy_type);
2294     }
2295
2296     /* proxy http tunneling */
2297     plugin->proxy_use_httpproxytunnel
2298       = GNUNET_CONFIGURATION_get_value_yesno (plugin->env->cfg,
2299                                               plugin->name,
2300                                               "PROXY_HTTP_TUNNELING");
2301     if (GNUNET_SYSERR == plugin->proxy_use_httpproxytunnel)
2302       plugin->proxy_use_httpproxytunnel = GNUNET_NO;
2303
2304     GNUNET_free_non_null (proxy_type);
2305   }
2306
2307   /* Should we emulate an XHR client for testing? */
2308   plugin->emulate_xhr
2309     = GNUNET_CONFIGURATION_get_value_yesno (plugin->env->cfg,
2310                                             plugin->name,
2311                                             "EMULATE_XHR");
2312   return GNUNET_OK;
2313 }
2314
2315
2316 /**
2317  * Function to convert an address to a human-readable string.
2318  *
2319  * @param cls closure
2320  * @param addr address to convert
2321  * @param addrlen address length
2322  * @return res string if conversion was successful, NULL otherwise
2323  */
2324 static const char *
2325 http_client_plugin_address_to_string (void *cls,
2326                                       const void *addr,
2327                                       size_t addrlen)
2328 {
2329   return http_common_plugin_address_to_string (PLUGIN_NAME,
2330                                                addr,
2331                                                addrlen);
2332 }
2333
2334
2335 /**
2336  * Function that will be called whenever the transport service wants to
2337  * notify the plugin that a session is still active and in use and
2338  * therefore the session timeout for this session has to be updated
2339  *
2340  * @param cls closure
2341  * @param peer which peer was the session for
2342  * @param session which session is being updated
2343  */
2344 static void
2345 http_client_plugin_update_session_timeout (void *cls,
2346                                            const struct GNUNET_PeerIdentity *peer,
2347                                            struct GNUNET_ATS_Session *session)
2348 {
2349   client_reschedule_session_timeout (session);
2350 }
2351
2352
2353 /**
2354  * Function that will be called whenever the transport service wants to
2355  * notify the plugin that the inbound quota changed and that the plugin
2356  * should update it's delay for the next receive value
2357  *
2358  * @param cls closure
2359  * @param peer which peer was the session for
2360  * @param s which session is being updated
2361  * @param delay new delay to use for receiving
2362  */
2363 static void
2364 http_client_plugin_update_inbound_delay (void *cls,
2365                                          const struct GNUNET_PeerIdentity *peer,
2366                                          struct GNUNET_ATS_Session *s,
2367                                          struct GNUNET_TIME_Relative delay)
2368 {
2369   s->next_receive = GNUNET_TIME_relative_to_absolute (delay);
2370   LOG (GNUNET_ERROR_TYPE_DEBUG,
2371        "New inbound delay %s\n",
2372        GNUNET_STRINGS_relative_time_to_string (delay,
2373                                                GNUNET_NO));
2374   if (s->recv_wakeup_task != NULL)
2375   {
2376     GNUNET_SCHEDULER_cancel (s->recv_wakeup_task);
2377     s->recv_wakeup_task
2378       = GNUNET_SCHEDULER_add_delayed (delay,
2379                                       &client_wake_up,
2380                                       s);
2381   }
2382 }
2383
2384
2385 /**
2386  * Return information about the given session to the
2387  * monitor callback.
2388  *
2389  * @param cls the `struct Plugin` with the monitor callback (`sic`)
2390  * @param peer peer we send information about
2391  * @param value our `struct GNUNET_ATS_Session` to send information about
2392  * @return #GNUNET_OK (continue to iterate)
2393  */
2394 static int
2395 send_session_info_iter (void *cls,
2396                         const struct GNUNET_PeerIdentity *peer,
2397                         void *value)
2398 {
2399   struct HTTP_Client_Plugin *plugin = cls;
2400   struct GNUNET_ATS_Session *session = value;
2401
2402   notify_session_monitor (plugin,
2403                           session,
2404                           GNUNET_TRANSPORT_SS_INIT);
2405   notify_session_monitor (plugin,
2406                           session,
2407                           GNUNET_TRANSPORT_SS_UP); /* FIXME: or handshake? */
2408   return GNUNET_OK;
2409 }
2410
2411
2412 /**
2413  * Begin monitoring sessions of a plugin.  There can only
2414  * be one active monitor per plugin (i.e. if there are
2415  * multiple monitors, the transport service needs to
2416  * multiplex the generated events over all of them).
2417  *
2418  * @param cls closure of the plugin
2419  * @param sic callback to invoke, NULL to disable monitor;
2420  *            plugin will being by iterating over all active
2421  *            sessions immediately and then enter monitor mode
2422  * @param sic_cls closure for @a sic
2423  */
2424 static void
2425 http_client_plugin_setup_monitor (void *cls,
2426                                   GNUNET_TRANSPORT_SessionInfoCallback sic,
2427                                   void *sic_cls)
2428 {
2429   struct HTTP_Client_Plugin *plugin = cls;
2430
2431   plugin->sic = sic;
2432   plugin->sic_cls = sic_cls;
2433   if (NULL != sic)
2434   {
2435     GNUNET_CONTAINER_multipeermap_iterate (plugin->sessions,
2436                                            &send_session_info_iter,
2437                                            plugin);
2438     /* signal end of first iteration */
2439     sic (sic_cls, NULL, NULL);
2440   }
2441 }
2442
2443
2444 /**
2445  * Entry point for the plugin.
2446  */
2447 void *
2448 LIBGNUNET_PLUGIN_TRANSPORT_INIT (void *cls)
2449 {
2450   struct GNUNET_TRANSPORT_PluginEnvironment *env = cls;
2451   struct GNUNET_TRANSPORT_PluginFunctions *api;
2452   struct HTTP_Client_Plugin *plugin;
2453
2454   if (NULL == env->receive)
2455   {
2456     /* run in 'stub' mode (i.e. as part of gnunet-peerinfo), don't fully
2457        initialze the plugin or the API */
2458     api = GNUNET_new (struct GNUNET_TRANSPORT_PluginFunctions);
2459     api->cls = NULL;
2460     api->address_to_string = &http_client_plugin_address_to_string;
2461     api->string_to_address = &http_common_plugin_string_to_address;
2462     api->address_pretty_printer = &http_common_plugin_address_pretty_printer;
2463     return api;
2464   }
2465
2466   plugin = GNUNET_new (struct HTTP_Client_Plugin);
2467   plugin->env = env;
2468   plugin->sessions = GNUNET_CONTAINER_multipeermap_create (128,
2469                                                            GNUNET_YES);
2470   api = GNUNET_new (struct GNUNET_TRANSPORT_PluginFunctions);
2471   api->cls = plugin;
2472   api->send = &http_client_plugin_send;
2473   api->disconnect_session = &http_client_plugin_session_disconnect;
2474   api->query_keepalive_factor = &http_client_query_keepalive_factor;
2475   api->disconnect_peer = &http_client_plugin_peer_disconnect;
2476   api->check_address = &http_client_plugin_address_suggested;
2477   api->get_session = &http_client_plugin_get_session;
2478   api->address_to_string = &http_client_plugin_address_to_string;
2479   api->string_to_address = &http_common_plugin_string_to_address;
2480   api->address_pretty_printer = &http_common_plugin_address_pretty_printer;
2481   api->get_network = &http_client_plugin_get_network;
2482   api->get_network_for_address = &http_client_plugin_get_network_for_address;
2483   api->update_session_timeout = &http_client_plugin_update_session_timeout;
2484   api->update_inbound_delay = &http_client_plugin_update_inbound_delay;
2485   api->setup_monitor = &http_client_plugin_setup_monitor;
2486 #if BUILD_HTTPS
2487   plugin->name = "transport-https_client";
2488   plugin->protocol = "https";
2489 #else
2490   plugin->name = "transport-http_client";
2491   plugin->protocol = "http";
2492 #endif
2493   plugin->last_tag = 1;
2494
2495   if (GNUNET_SYSERR == client_configure_plugin (plugin))
2496   {
2497     LIBGNUNET_PLUGIN_TRANSPORT_DONE (api);
2498     return NULL;
2499   }
2500
2501   /* Start client */
2502   if (GNUNET_SYSERR == client_start (plugin))
2503   {
2504     LIBGNUNET_PLUGIN_TRANSPORT_DONE (api);
2505     return NULL;
2506   }
2507   return api;
2508 }
2509
2510 /* end of plugin_transport_http_client.c */