src/transport/plugin_transport_http.c

   1 /*
   2      This file is part of GNUnet
   3      (C) 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009 Christian Grothoff (and other contributing authors)
   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., 59 Temple Place - Suite 330,
  18      Boston, MA 02111-1307, USA.
  19 */
  20
  21 /**
  22  * @file transport/plugin_transport_http.c
  23  * @brief http transport service plugin
  24  * @author Matthias Wachs
  25  */
  26
  27 #include "platform.h"
  28 #include "gnunet_common.h"
  29 #include "gnunet_constants.h"
  30 #include "gnunet_protocols.h"
  31 #include "gnunet_connection_lib.h"
  32 #include "gnunet_service_lib.h"
  33 #include "gnunet_statistics_service.h"
  34 #include "gnunet_transport_service.h"
  35 #include "gnunet_resolver_service.h"
  36 #include "gnunet_server_lib.h"
  37 #include "gnunet_container_lib.h"
  38 #include "plugin_transport.h"
  39 #include "gnunet_os_lib.h"
  40 #include "microhttpd.h"
  41 #include <curl/curl.h>
  42
  43 #define DEBUG_HTTP GNUNET_NO
  44 #define DEBUG_CURL GNUNET_NO
  45 #define DEBUG_CONNECTIONS GNUNET_NO
  46 #define DEBUG_SESSION_SELECTION GNUNET_NO
  47
  48 #define INBOUND GNUNET_NO
  49 #define OUTBOUND GNUNET_YES
  50
  51 #define PROTOCOL_PREFIX "http"
  52
  53 /**
  54  * Text of the response sent back after the last bytes of a PUT
  55  * request have been received (just to formally obey the HTTP
  56  * protocol).
  57  */
  58 #define HTTP_PUT_RESPONSE "Thank you!"
  59
  60 /**
  61  * After how long do we expire an address that we
  62  * learned from another peer if it is not reconfirmed
  63  * by anyone?
  64  */
  65 #define LEARNED_ADDRESS_EXPIRATION GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_HOURS, 6)
  66
  67 /**
  68  * Page returned if request invalid
  69  */
  70 #define HTTP_ERROR_RESPONSE "<!DOCTYPE HTML PUBLIC \"-//IETF//DTD HTML 2.0//EN\"><HTML><HEAD><TITLE>404 Not Found</TITLE></HEAD><BODY><H1>Not Found</H1>The requested URL was not found on this server.<P><HR><ADDRESS></ADDRESS></BODY></HTML>"
  71
  72 /**
  73  * Timeout for a http connect
  74  */
  75 #define HTTP_CONNECT_TIMEOUT 30
  76
  77
  78 /**
  79  * Network format for IPv4 addresses.
  80  */
  81 struct IPv4HttpAddress
  82 {
  83   /**
  84    * IPv4 address, in network byte order.
  85    */
  86   uint32_t ipv4_addr GNUNET_PACKED;
  87
  88   /**
  89    * Port number, in network byte order.
  90    */
  91   uint16_t u_port GNUNET_PACKED;
  92
  93 };
  94
  95
  96 /**
  97  * Network format for IPv6 addresses.
  98  */
  99 struct IPv6HttpAddress
 100 {
 101   /**
 102    * IPv6 address.
 103    */
 104   struct in6_addr ipv6_addr GNUNET_PACKED;
 105
 106   /**
 107    * Port number, in network byte order.
 108    */
 109   uint16_t u6_port GNUNET_PACKED;
 110
 111 };
 112
 113
 114 /**
 115  *  Message to send using http
 116  */
 117 struct HTTP_Message
 118 {
 119   /**
 120    * next pointer for double linked list
 121    */
 122   struct HTTP_Message * next;
 123
 124   /**
 125    * previous pointer for double linked list
 126    */
 127   struct HTTP_Message * prev;
 128
 129   /**
 130    * buffer containing data to send
 131    */
 132   char *buf;
 133
 134   /**
 135    * amount of data already sent
 136    */
 137   size_t pos;
 138
 139   /**
 140    * buffer length
 141    */
 142   size_t size;
 143
 144   /**
 145    * Continuation function to call once the transmission buffer
 146    * has again space available.  NULL if there is no
 147    * continuation to call.
 148    */
 149   GNUNET_TRANSPORT_TransmitContinuation transmit_cont;
 150
 151   /**
 152    * Closure for transmit_cont.
 153    */
 154   void *transmit_cont_cls;
 155 };
 156
 157
 158 struct HTTP_PeerContext
 159 {
 160   /**
 161    * peer's identity
 162    */
 163   struct GNUNET_PeerIdentity identity;
 164
 165   /**
 166    * Pointer to the global plugin struct.
 167    */
 168   struct Plugin *plugin;
 169
 170   /**
 171    * Linked list of connections with this peer
 172    * head
 173    */
 174   struct Session * head;
 175
 176   /**
 177    * Linked list of connections with this peer
 178    * tail
 179    */
 180   struct Session * tail;
 181
 182   /**
 183    * id for next session
 184    */
 185   size_t session_id_counter;
 186
 187   /**
 188    * Last session used to send data
 189    */
 190   struct Session * last_session;
 191 };
 192
 193
 194 struct Session
 195 {
 196   /**
 197    * API requirement.
 198    */
 199   struct SessionHeader header;
 200
 201   /**
 202    * next session in linked list
 203    */
 204   struct Session * next;
 205
 206   /**
 207    * previous session in linked list
 208    */
 209   struct Session * prev;
 210
 211   /**
 212    * address of this session
 213    */
 214   void * addr;
 215
 216   /**
 217    * address length
 218    */
 219   size_t addrlen;
 220
 221   /**
 222    * target url
 223    */
 224   char * url;
 225
 226   /**
 227    * Message queue for outbound messages
 228    * head of queue
 229    */
 230   struct HTTP_Message * pending_msgs_head;
 231
 232   /**
 233    * Message queue for outbound messages
 234    * tail of queue
 235    */
 236   struct HTTP_Message * pending_msgs_tail;
 237
 238   /**
 239    * partner peer this connection belongs to
 240    */
 241   struct HTTP_PeerContext * peercontext;
 242
 243   /**
 244    * message stream tokenizer for incoming data
 245    */
 246   struct GNUNET_SERVER_MessageStreamTokenizer *msgtok;
 247
 248   /**
 249    * session direction
 250    * outbound: OUTBOUND (GNUNET_YES)
 251    * inbound : INBOUND (GNUNET_NO)
 252    */
 253   unsigned int direction;
 254
 255   /**
 256    * is session connected to send data?
 257    */
 258   unsigned int send_connected;
 259
 260   /**
 261    * is send connection active?
 262    */
 263   unsigned int send_active;
 264
 265   /**
 266    * connection disconnect forced (e.g. from transport)
 267    */
 268   unsigned int send_force_disconnect;
 269
 270   /**
 271    * is session connected to receive data?
 272    */
 273   unsigned int recv_connected;
 274
 275   /**
 276    * is receive connection active?
 277    */
 278   unsigned int recv_active;
 279
 280   /**
 281    * connection disconnect forced (e.g. from transport)
 282    */
 283   unsigned int recv_force_disconnect;
 284
 285   /**
 286    * id for next session
 287    * NOTE: 0 is not an ID, zero is not defined. A correct ID is always > 0
 288    */
 289   size_t session_id;
 290
 291   /**
 292    * entity managing sending data
 293    * outbound session: CURL *
 294    * inbound session: mhd_connection *
 295    */
 296   void * send_endpoint;
 297
 298   /**
 299    * entity managing recieving data
 300    * outbound session: CURL *
 301    * inbound session: mhd_connection *
 302    */
 303   void * recv_endpoint;
 304 };
 305
 306 /**
 307  * Encapsulation of all of the state of the plugin.
 308  */
 309 struct Plugin
 310 {
 311   /**
 312    * Our environment.
 313    */
 314   struct GNUNET_TRANSPORT_PluginEnvironment *env;
 315
 316   /**
 317    * Handle for reporting statistics.
 318    */
 319   struct GNUNET_STATISTICS_Handle *stats;
 320
 321   unsigned int port_inbound;
 322
 323   struct GNUNET_CONTAINER_MultiHashMap *peers;
 324
 325   /**
 326    * Daemon for listening for new IPv4 connections.
 327    */
 328   struct MHD_Daemon *http_server_daemon_v4;
 329
 330   /**
 331    * Daemon for listening for new IPv6connections.
 332    */
 333   struct MHD_Daemon *http_server_daemon_v6;
 334
 335   /**
 336    * Our primary task for http daemon handling IPv4 connections
 337    */
 338   GNUNET_SCHEDULER_TaskIdentifier http_server_task_v4;
 339
 340   /**
 341    * Our primary task for http daemon handling IPv6 connections
 342    */
 343   GNUNET_SCHEDULER_TaskIdentifier http_server_task_v6;
 344
 345   /**
 346    * The task sending data
 347    */
 348   GNUNET_SCHEDULER_TaskIdentifier http_curl_task;
 349
 350   /**
 351    * cURL Multihandle
 352    */
 353   CURLM * multi_handle;
 354
 355   /**
 356    * Our ASCII encoded, hashed peer identity
 357    * This string is used to distinguish between connections and is added to the urls
 358    */
 359   struct GNUNET_CRYPTO_HashAsciiEncoded my_ascii_hash_ident;
 360
 361   struct sockaddr_in * bind4_address;
 362   struct sockaddr_in6 * bind6_address;
 363   char * bind_hostname;
 364   int use_ipv6;
 365   int use_ipv4;
 366 };
 367
 368
 369 /**
 370  * Function called for a quick conversion of the binary address to
 371  * a numeric address.  Note that the caller must not free the
 372  * address and that the next call to this function is allowed
 373  * to override the address again.
 374  *
 375  * @param cls closure
 376  * @param addr binary address
 377  * @param addrlen length of the address
 378  * @return string representing the same address
 379  */
 380 static const char*
 381 http_plugin_address_to_string (void *cls,
 382                                    const void *addr,
 383                                    size_t addrlen);
 384
 385
 386 /**
 387  * Call MHD to process pending ipv4 requests and then go back
 388  * and schedule the next run.
 389  */
 390 static void http_server_daemon_v4_run (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc);
 391 /**
 392  * Call MHD to process pending ipv6 requests and then go back
 393  * and schedule the next run.
 394  */
 395 static void http_server_daemon_v6_run (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc);
 396
 397 /**
 398  * Function setting up curl handle and selecting message to send
 399  * @param cls plugin
 400  * @param ses session to send data to
 401  * @param con connection
 402  * @return bytes sent to peer
 403  */
 404 static ssize_t send_check_connections (void *cls, struct Session *ps);
 405
 406 /**
 407  * Function setting up file descriptors and scheduling task to run
 408  * @param cls closure
 409  * @param ses session to send data to
 410  * @param
 411  */
 412 static int curl_schedule(void *cls );
 413
 414
 415
 416 static char * create_url(void * cls, const void * addr, size_t addrlen, size_t id)
 417 {
 418   struct Plugin *plugin = cls;
 419   char *url = NULL;
 420
 421   GNUNET_assert ((addr!=NULL) && (addrlen != 0));
 422   GNUNET_asprintf(&url,
 423                   "%s://%s/%s;%u", PROTOCOL_PREFIX,
 424                   http_plugin_address_to_string(NULL, addr, addrlen),
 425                   (char *) (&plugin->my_ascii_hash_ident),id);
 426
 427   return url;
 428 }
 429
 430 /**
 431  * Removes a message from the linked list of messages
 432  * @param con connection to remove message from
 433  * @param msg message to remove
 434  * @return GNUNET_SYSERR if msg not found, GNUNET_OK on success
 435  */
 436 static int remove_http_message (struct Session * ps, struct HTTP_Message * msg)
 437 {
 438   GNUNET_CONTAINER_DLL_remove(ps->pending_msgs_head,ps->pending_msgs_tail,msg);
 439   GNUNET_free(msg);
 440   return GNUNET_OK;
 441 }
 442
 443 int remove_peer_context_Iterator (void *cls, const GNUNET_HashCode *key, void *value);
 444
 445 /**
 446  * Removes a session from the linked list of sessions
 447  * @param pc peer context
 448  * @param ps session
 449  * @param call_msg_cont GNUNET_YES to call pending message continuations, otherwise no
 450  * @param call_msg_cont_result, result to call message continuations with
 451  * @return GNUNET_SYSERR if msg not found, GNUNET_OK on success
 452  */
 453 static int remove_session (struct HTTP_PeerContext * pc, struct Session * ps,  int call_msg_cont, int call_msg_cont_result)
 454 {
 455   struct HTTP_Message * msg;
 456   struct Plugin * plugin = ps->peercontext->plugin;
 457
 458 #if DEBUG_CONNECTIONS
 459   GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,"Connection %X: removing %s session %X with id %u\n", ps, (ps->direction == INBOUND) ? "inbound" : "outbound", ps, ps->session_id);
 460 #endif
 461   plugin->env->session_end(plugin, &pc->identity, ps);
 462
 463   GNUNET_free_non_null (ps->addr);
 464   GNUNET_SERVER_mst_destroy (ps->msgtok);
 465   GNUNET_free(ps->url);
 466
 467   if (ps->direction==INBOUND)
 468   {
 469           if (ps->recv_endpoint != NULL)
 470           {
 471                   curl_easy_cleanup(ps->recv_endpoint);
 472                   ps->recv_endpoint = NULL;
 473           }
 474           if (ps->send_endpoint != NULL)
 475           {
 476                   curl_easy_cleanup(ps->send_endpoint);
 477                   ps->send_endpoint = NULL;
 478           }
 479   }
 480
 481   msg = ps->pending_msgs_head;
 482   while (msg!=NULL)
 483   {
 484     if ((call_msg_cont == GNUNET_YES) && (msg->transmit_cont!=NULL))
 485     {
 486       msg->transmit_cont (msg->transmit_cont_cls,&pc->identity,call_msg_cont_result);
 487     }
 488     GNUNET_CONTAINER_DLL_remove(ps->pending_msgs_head,ps->pending_msgs_head,msg);
 489     GNUNET_free(msg);
 490     msg = ps->pending_msgs_head;
 491   }
 492
 493   GNUNET_CONTAINER_DLL_remove(pc->head,pc->tail,ps);
 494   GNUNET_free(ps);
 495   ps = NULL;
 496
 497   /* no sessions left remove peer */
 498   if (pc->head==NULL)
 499   {
 500 #if DEBUG_HTTP
 501   GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,"No sessions left for peer `%s', removing context\n",GNUNET_i2s(&pc->identity));
 502 #endif
 503         remove_peer_context_Iterator(plugin, &pc->identity.hashPubKey, pc);
 504   }
 505
 506   return GNUNET_OK;
 507 }
 508
 509 int remove_peer_context_Iterator (void *cls, const GNUNET_HashCode *key, void *value)
 510 {
 511   struct Plugin *plugin = cls;
 512   struct HTTP_PeerContext * pc = value;
 513   struct Session * ps = pc->head;
 514   struct Session * tmp = NULL;
 515   struct HTTP_Message * msg = NULL;
 516   struct HTTP_Message * msg_tmp = NULL;
 517 #if DEBUG_HTTP
 518   GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,"Freeing context for peer `%s'\n",GNUNET_i2s(&pc->identity));
 519 #endif
 520   GNUNET_CONTAINER_multihashmap_remove (plugin->peers, &pc->identity.hashPubKey, pc);
 521   while (ps!=NULL)
 522   {
 523         plugin->env->session_end(plugin, &pc->identity, ps);
 524         tmp = ps->next;
 525
 526     GNUNET_free_non_null (ps->addr);
 527     GNUNET_free(ps->url);
 528     if (ps->msgtok != NULL)
 529       GNUNET_SERVER_mst_destroy (ps->msgtok);
 530
 531     msg = ps->pending_msgs_head;
 532     while (msg!=NULL)
 533     {
 534       msg_tmp = msg->next;
 535       GNUNET_free(msg);
 536       msg = msg_tmp;
 537     }
 538     if (ps->direction==OUTBOUND)
 539     {
 540       if (ps->send_endpoint!=NULL)
 541         curl_easy_cleanup(ps->send_endpoint);
 542       if (ps->recv_endpoint!=NULL)
 543         curl_easy_cleanup(ps->recv_endpoint);
 544     }
 545
 546     GNUNET_free(ps);
 547     ps=tmp;
 548   }
 549   GNUNET_free(pc);
 550   GNUNET_STATISTICS_update (plugin->env->stats,
 551                             gettext_noop ("# HTTP peers active"),
 552                             -1,
 553                             GNUNET_NO);
 554   return GNUNET_YES;
 555 }
 556
 557 /**
 558  * Add the IP of our network interface to the list of
 559  * our external IP addresses.
 560  *
 561  * @param cls the 'struct Plugin*'
 562  * @param name name of the interface
 563  * @param isDefault do we think this may be our default interface
 564  * @param addr address of the interface
 565  * @param addrlen number of bytes in addr
 566  * @return GNUNET_OK to continue iterating
 567  */
 568 static int
 569 process_interfaces (void *cls,
 570                     const char *name,
 571                     int isDefault,
 572                     const struct sockaddr *addr, socklen_t addrlen)
 573 {
 574   struct Plugin *plugin = cls;
 575   struct IPv4HttpAddress * t4;
 576   struct IPv6HttpAddress * t6;
 577   int af;
 578
 579
 580   GNUNET_assert(cls !=NULL);
 581   af = addr->sa_family;
 582   if ((af == AF_INET) && (plugin->use_ipv4 == GNUNET_YES) && (plugin->bind6_address == NULL))
 583     {
 584           struct in_addr bnd_cmp = ((struct sockaddr_in *) addr)->sin_addr;
 585       t4 = GNUNET_malloc(sizeof(struct IPv4HttpAddress));
 586       /* Not skipping loopback addresses
 587       if (INADDR_LOOPBACK == ntohl(((struct sockaddr_in *) addr)->sin_addr.s_addr))
 588       {
 589
 590         return GNUNET_OK;
 591       }
 592       */
 593       t4->ipv4_addr = ((struct sockaddr_in *) addr)->sin_addr.s_addr;
 594       t4->u_port = htons (plugin->port_inbound);
 595       if (plugin->bind4_address != NULL)
 596       {
 597           if (0 == memcmp(&plugin->bind4_address->sin_addr, &bnd_cmp, sizeof (struct in_addr)))
 598           {
 599                   plugin->env->notify_address(plugin->env->cls,"http",t4, sizeof (struct IPv4HttpAddress), GNUNET_TIME_UNIT_FOREVER_REL);
 600           }
 601       }
 602       else
 603       {
 604           plugin->env->notify_address(plugin->env->cls,"http",t4, sizeof (struct IPv4HttpAddress), GNUNET_TIME_UNIT_FOREVER_REL);
 605       }
 606       GNUNET_free (t4);
 607     }
 608   else if ((af == AF_INET6) && (plugin->use_ipv6 == GNUNET_YES)  && (plugin->bind4_address == NULL))
 609     {
 610           struct in6_addr bnd_cmp6 = ((struct sockaddr_in6 *) addr)->sin6_addr;
 611       if (IN6_IS_ADDR_LINKLOCAL (&((struct sockaddr_in6 *) addr)->sin6_addr))
 612         {
 613           return GNUNET_OK;
 614         }
 615       t6 = GNUNET_malloc(sizeof(struct IPv6HttpAddress));
 616       GNUNET_assert(t6 != NULL);
 617       if (plugin->bind6_address != NULL)
 618       {
 619           if (0 == memcmp(&plugin->bind6_address->sin6_addr, &bnd_cmp6, sizeof (struct in6_addr)))
 620           {
 621               memcpy (&t6->ipv6_addr,
 622                       &((struct sockaddr_in6 *) addr)->sin6_addr,
 623                       sizeof (struct in6_addr));
 624               t6->u6_port = htons (plugin->port_inbound);
 625               plugin->env->notify_address(plugin->env->cls,"http",t6,sizeof (struct IPv6HttpAddress) , GNUNET_TIME_UNIT_FOREVER_REL);
 626           }
 627       }
 628       else
 629       {
 630           memcpy (&t6->ipv6_addr,
 631                   &((struct sockaddr_in6 *) addr)->sin6_addr,
 632                   sizeof (struct in6_addr));
 633           t6->u6_port = htons (plugin->port_inbound);
 634           plugin->env->notify_address(plugin->env->cls,"http",t6,sizeof (struct IPv6HttpAddress) , GNUNET_TIME_UNIT_FOREVER_REL);
 635       }
 636       GNUNET_free (t6);
 637     }
 638   return GNUNET_OK;
 639 }
 640
 641
 642 /**
 643  * Callback called by MHD when a connection is terminated
 644  */
 645 static void mhd_termination_cb (void *cls, struct MHD_Connection * connection, void **httpSessionCache)
 646 {
 647   struct Session * ps = *httpSessionCache;
 648   if (ps == NULL)
 649     return;
 650   struct HTTP_PeerContext * pc = ps->peercontext;
 651
 652   if (connection==ps->recv_endpoint)
 653   {
 654 #if DEBUG_CONNECTIONS
 655     GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,"Connection %X: inbound connection from peer `%s' was terminated\n", ps, GNUNET_i2s(&pc->identity));
 656 #endif
 657     ps->recv_active = GNUNET_NO;
 658     ps->recv_connected = GNUNET_NO;
 659     ps->recv_endpoint = NULL;
 660   }
 661   if (connection==ps->send_endpoint)
 662   {
 663
 664     ps->send_active = GNUNET_NO;
 665     ps->send_connected = GNUNET_NO;
 666     ps->send_endpoint = NULL;
 667 #if DEBUG_CONNECTIONS
 668     GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,"Connection %X: outbound connection from peer `%s' was terminated\n", ps, GNUNET_i2s(&pc->identity));
 669 #endif
 670   }
 671
 672   /* if both connections disconnected, remove session */
 673   if ((ps->send_connected == GNUNET_NO) && (ps->recv_connected == GNUNET_NO))
 674   {
 675       GNUNET_STATISTICS_update (pc->plugin->env->stats,
 676                             gettext_noop ("# HTTP inbound sessions for peers active"),
 677                             -1,
 678                             GNUNET_NO);
 679     remove_session(pc,ps,GNUNET_YES,GNUNET_SYSERR);
 680   }
 681 }
 682
 683 static void mhd_write_mst_cb (void *cls,
 684                               void *client,
 685                               const struct GNUNET_MessageHeader *message)
 686 {
 687
 688   struct Session *ps  = cls;
 689   GNUNET_assert(ps != NULL);
 690
 691   struct HTTP_PeerContext *pc = ps->peercontext;
 692   GNUNET_assert(pc != NULL);
 693 #if DEBUG_HTTP
 694   GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
 695               "Connection %X: Forwarding message to transport service, type %u and size %u from `%s' (`%s')\n",
 696               ps,
 697               ntohs(message->type),
 698               ntohs(message->size),
 699               GNUNET_i2s(&(ps->peercontext)->identity),http_plugin_address_to_string(NULL,ps->addr,ps->addrlen));
 700 #endif
 701   pc->plugin->env->receive (ps->peercontext->plugin->env->cls,
 702                             &pc->identity,
 703                             message, 1, ps,
 704                             NULL,
 705                             0);
 706 }
 707
 708 /**
 709  * Check if ip is allowed to connect.
 710  */
 711 static int
 712 mhd_accept_cb (void *cls,
 713                       const struct sockaddr *addr, socklen_t addr_len)
 714 {
 715 #if 0
 716   struct Plugin *plugin = cls;
 717 #endif
 718   /* Every connection is accepted, nothing more to do here */
 719   return MHD_YES;
 720 }
 721
 722 int mhd_send_callback (void *cls, uint64_t pos, char *buf, int max)
 723 {
 724   int bytes_read = 0;
 725
 726   struct Session * ps = cls;
 727   struct HTTP_PeerContext * pc;
 728   struct HTTP_Message * msg;
 729
 730   GNUNET_assert (ps!=NULL);
 731   pc = ps->peercontext;
 732   msg = ps->pending_msgs_tail;
 733   if (ps->send_force_disconnect==GNUNET_YES)
 734   {
 735 #if DEBUG_CONNECTIONS
 736     GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,"Connection %X: outbound forced to disconnect\n",ps);
 737 #endif
 738     return -1;
 739   }
 740
 741   if (msg!=NULL)
 742   {
 743     if ((msg->size-msg->pos) <= max)
 744     {
 745       memcpy(buf,&msg->buf[msg->pos],(msg->size-msg->pos));
 746       bytes_read = msg->size-msg->pos;
 747       msg->pos+=(msg->size-msg->pos);
 748     }
 749     else
 750     {
 751       memcpy(buf,&msg->buf[msg->pos],max);
 752       msg->pos+=max;
 753       bytes_read = max;
 754     }
 755
 756     if (msg->pos==msg->size)
 757     {
 758       if (NULL!=msg->transmit_cont)
 759         msg->transmit_cont (msg->transmit_cont_cls,&pc->identity,GNUNET_OK);
 760       remove_http_message(ps,msg);
 761     }
 762   }
 763   return bytes_read;
 764 }
 765
 766 /**
 767  * Process GET or PUT request received via MHD.  For
 768  * GET, queue response that will send back our pending
 769  * messages.  For PUT, process incoming data and send
 770  * to GNUnet core.  In either case, check if a session
 771  * already exists and create a new one if not.
 772  */
 773 static int
 774 mdh_access_cb (void *cls,
 775                        struct MHD_Connection *mhd_connection,
 776                        const char *url,
 777                        const char *method,
 778                        const char *version,
 779                        const char *upload_data,
 780                        size_t * upload_data_size, void **httpSessionCache)
 781 {
 782   struct Plugin *plugin = cls;
 783   struct MHD_Response *response;
 784   const union MHD_ConnectionInfo * conn_info;
 785
 786   struct sockaddr_in  *addrin;
 787   struct sockaddr_in6 *addrin6;
 788
 789   char address[INET6_ADDRSTRLEN+14];
 790   struct GNUNET_PeerIdentity pi_in;
 791   size_t id_num = 0;
 792
 793   struct IPv4HttpAddress ipv4addr;
 794   struct IPv6HttpAddress ipv6addr;
 795
 796   struct HTTP_PeerContext *pc;
 797   struct Session *ps = NULL;
 798   struct Session *ps_tmp = NULL;
 799
 800   int res = GNUNET_NO;
 801   int send_error_to_client;
 802   void * addr;
 803   size_t addr_len = 0 ;
 804
 805   GNUNET_assert(cls !=NULL);
 806   send_error_to_client = GNUNET_NO;
 807
 808   if (NULL == *httpSessionCache)
 809   {
 810     /* check url for peer identity , if invalid send HTTP 404*/
 811     size_t len = strlen(&url[1]);
 812     char * peer = GNUNET_malloc(104+1);
 813
 814     if ((len>104) && (url[104]==';'))
 815     {
 816         char * id = GNUNET_malloc((len-104)+1);
 817         strcpy(id,&url[105]);
 818         memcpy(peer,&url[1],103);
 819         peer[103] = '\0';
 820         id_num = strtoul ( id, NULL , 10);
 821         GNUNET_free(id);
 822     }
 823     res = GNUNET_CRYPTO_hash_from_string (peer, &(pi_in.hashPubKey));
 824     GNUNET_free(peer);
 825     if ( GNUNET_SYSERR == res )
 826     {
 827       response = MHD_create_response_from_data (strlen (HTTP_ERROR_RESPONSE),HTTP_ERROR_RESPONSE, MHD_NO, MHD_NO);
 828       res = MHD_queue_response (mhd_connection, MHD_HTTP_NOT_FOUND, response);
 829       MHD_destroy_response (response);
 830 #if DEBUG_CONNECTIONS
 831       if (res == MHD_YES)
 832         GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,"Peer has no valid ident, sent HTTP 1.1/404\n");
 833       else
 834         GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,"Peer has no valid ident, could not send error\n");
 835 #endif
 836       return res;
 837     }
 838   }
 839   else
 840   {
 841     ps = *httpSessionCache;
 842     pc = ps->peercontext;
 843   }
 844
 845   if (NULL == *httpSessionCache)
 846   {
 847     /* get peer context */
 848     pc = GNUNET_CONTAINER_multihashmap_get (plugin->peers, &pi_in.hashPubKey);
 849     /* Peer unknown */
 850     if (pc==NULL)
 851     {
 852       pc = GNUNET_malloc(sizeof (struct HTTP_PeerContext));
 853       pc->plugin = plugin;
 854       pc->session_id_counter=1;
 855       pc->last_session = NULL;
 856       memcpy(&pc->identity, &pi_in, sizeof(struct GNUNET_PeerIdentity));
 857       GNUNET_CONTAINER_multihashmap_put(plugin->peers, &pc->identity.hashPubKey, pc, GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY);
 858       GNUNET_STATISTICS_update (plugin->env->stats,
 859                             gettext_noop ("# HTTP peers active"),
 860                             1,
 861                             GNUNET_NO);
 862     }
 863
 864     conn_info = MHD_get_connection_info(mhd_connection, MHD_CONNECTION_INFO_CLIENT_ADDRESS );
 865     /* Incoming IPv4 connection */
 866     if ( AF_INET == conn_info->client_addr->sin_family)
 867     {
 868       addrin = conn_info->client_addr;
 869       inet_ntop(addrin->sin_family, &(addrin->sin_addr),address,INET_ADDRSTRLEN);
 870       memcpy(&ipv4addr.ipv4_addr,&(addrin->sin_addr),sizeof(struct in_addr));
 871       ipv4addr.u_port = addrin->sin_port;
 872       addr = &ipv4addr;
 873       addr_len = sizeof(struct IPv4HttpAddress);
 874     }
 875     /* Incoming IPv6 connection */
 876     if ( AF_INET6 == conn_info->client_addr->sin_family)
 877     {
 878       addrin6 = (struct sockaddr_in6 *) conn_info->client_addr;
 879       inet_ntop(addrin6->sin6_family, &(addrin6->sin6_addr),address,INET6_ADDRSTRLEN);
 880       memcpy(&ipv6addr.ipv6_addr,&(addrin6->sin6_addr),sizeof(struct in6_addr));
 881       ipv6addr.u6_port = addrin6->sin6_port;
 882       addr = &ipv6addr;
 883       addr_len = sizeof(struct IPv6HttpAddress);
 884     }
 885
 886     ps = NULL;
 887     /* only inbound sessions here */
 888
 889     ps_tmp = pc->head;
 890     while (ps_tmp!=NULL)
 891     {
 892       if ((ps_tmp->direction==INBOUND) && (ps_tmp->session_id == id_num) && (id_num!=0))
 893       {
 894         if ((ps_tmp->recv_force_disconnect!=GNUNET_YES) && (ps_tmp->send_force_disconnect!=GNUNET_YES))
 895         ps=ps_tmp;
 896         break;
 897       }
 898       ps_tmp=ps_tmp->next;
 899     }
 900
 901     if (ps==NULL)
 902     {
 903       ps = GNUNET_malloc(sizeof (struct Session));
 904       ps->addr = GNUNET_malloc(addr_len);
 905       memcpy(ps->addr,addr,addr_len);
 906       ps->addrlen = addr_len;
 907       ps->direction=INBOUND;
 908       ps->pending_msgs_head = NULL;
 909       ps->pending_msgs_tail = NULL;
 910       ps->send_connected=GNUNET_NO;
 911       ps->send_active=GNUNET_NO;
 912       ps->recv_connected=GNUNET_NO;
 913       ps->recv_active=GNUNET_NO;
 914       ps->peercontext=pc;
 915       ps->session_id =id_num;
 916       ps->url = create_url (plugin, ps->addr, ps->addrlen, ps->session_id);
 917       GNUNET_CONTAINER_DLL_insert(pc->head,pc->tail,ps);
 918       GNUNET_STATISTICS_update (plugin->env->stats,
 919                             gettext_noop ("# HTTP inbound sessions for peers active"),
 920                             1,
 921                             GNUNET_NO);
 922     }
 923
 924     *httpSessionCache = ps;
 925     if (ps->msgtok==NULL)
 926       ps->msgtok = GNUNET_SERVER_mst_create (&mhd_write_mst_cb, ps);
 927 #if DEBUG_HTTP
 928     GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,"Connection %X: HTTP Daemon has new an incoming `%s' request from peer `%s' (`%s')\n",
 929                 ps,
 930                 method,
 931                 GNUNET_i2s(&pc->identity),
 932                 http_plugin_address_to_string(NULL, ps->addr, ps->addrlen));
 933 #endif
 934   }
 935
 936   /* Is it a PUT or a GET request */
 937   if (0 == strcmp (MHD_HTTP_METHOD_PUT, method))
 938   {
 939     if (ps->recv_force_disconnect == GNUNET_YES)
 940     {
 941 #if DEBUG_CONNECTIONS
 942       GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,"Connection %X: inbound connection was forced to disconnect\n",ps);
 943 #endif
 944       ps->recv_active = GNUNET_NO;
 945       return MHD_NO;
 946     }
 947     if ((*upload_data_size == 0) && (ps->recv_active==GNUNET_NO))
 948     {
 949       ps->recv_endpoint = mhd_connection;
 950       ps->recv_connected = GNUNET_YES;
 951       ps->recv_active = GNUNET_YES;
 952       ps->recv_force_disconnect = GNUNET_NO;
 953 #if DEBUG_CONNECTIONS
 954       GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,"Connection %X: inbound PUT connection connected\n",ps);
 955 #endif
 956       return MHD_YES;
 957     }
 958
 959     /* Transmission of all data complete */
 960     if ((*upload_data_size == 0) && (ps->recv_active == GNUNET_YES))
 961     {
 962       response = MHD_create_response_from_data (strlen (HTTP_PUT_RESPONSE),HTTP_PUT_RESPONSE, MHD_NO, MHD_NO);
 963       res = MHD_queue_response (mhd_connection, MHD_HTTP_OK, response);
 964 #if DEBUG_CONNECTIONS
 965       GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,"Connection %X: Sent HTTP/1.1: 200 OK as PUT Response\n",ps);
 966 #endif
 967       MHD_destroy_response (response);
 968       ps->recv_active=GNUNET_NO;
 969       return MHD_YES;
 970     }
 971
 972     /* Recieving data */
 973     if ((*upload_data_size > 0) && (ps->recv_active == GNUNET_YES))
 974     {
 975       res = GNUNET_SERVER_mst_receive(ps->msgtok, ps, upload_data,*upload_data_size, GNUNET_NO, GNUNET_NO);
 976       (*upload_data_size) = 0;
 977       return MHD_YES;
 978     }
 979     else
 980       return MHD_NO;
 981   }
 982   if ( 0 == strcmp (MHD_HTTP_METHOD_GET, method) )
 983   {
 984     if (ps->send_force_disconnect == GNUNET_YES)
 985     {
 986 #if DEBUG_CONNECTIONS
 987       GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,"Connection %X: outbound connection was  forced to disconnect\n",ps);
 988 #endif
 989       ps->send_active = GNUNET_NO;
 990       return MHD_NO;
 991     }
 992           ps->send_connected = GNUNET_YES;
 993           ps->send_active = GNUNET_YES;
 994           ps->send_endpoint = mhd_connection;
 995           ps->send_force_disconnect = GNUNET_NO;
 996 #if DEBUG_CONNECTIONS
 997           GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,"Connection %X: inbound GET connection connected\n",ps);
 998 #endif
 999           response = MHD_create_response_from_callback(-1,32 * 1024, &mhd_send_callback, ps, NULL);
1000           res = MHD_queue_response (mhd_connection, MHD_HTTP_OK, response);
1001           MHD_destroy_response (response);
1002           return MHD_YES;
1003   }
1004   return MHD_NO;
1005 }
1006
1007 /**
1008  * Function that queries MHD's select sets and
1009  * starts the task waiting for them.
1010  */
1011 static GNUNET_SCHEDULER_TaskIdentifier
1012 http_server_daemon_prepare (void * cls, struct MHD_Daemon *daemon_handle)
1013 {
1014   struct Plugin *plugin = cls;
1015   GNUNET_SCHEDULER_TaskIdentifier ret;
1016   fd_set rs;
1017   fd_set ws;
1018   fd_set es;
1019   struct GNUNET_NETWORK_FDSet *wrs;
1020   struct GNUNET_NETWORK_FDSet *wws;
1021   struct GNUNET_NETWORK_FDSet *wes;
1022   int max;
1023   unsigned long long timeout;
1024   int haveto;
1025   struct GNUNET_TIME_Relative tv;
1026
1027   GNUNET_assert(cls !=NULL);
1028   ret = GNUNET_SCHEDULER_NO_TASK;
1029   FD_ZERO(&rs);
1030   FD_ZERO(&ws);
1031   FD_ZERO(&es);
1032   wrs = GNUNET_NETWORK_fdset_create ();
1033   wes = GNUNET_NETWORK_fdset_create ();
1034   wws = GNUNET_NETWORK_fdset_create ();
1035   max = -1;
1036   GNUNET_assert (MHD_YES ==
1037                  MHD_get_fdset (daemon_handle,
1038                                 &rs,
1039                                 &ws,
1040                                 &es,
1041                                 &max));
1042   haveto = MHD_get_timeout (daemon_handle, &timeout);
1043   if (haveto == MHD_YES)
1044     tv.value = (uint64_t) timeout;
1045   else
1046     tv = GNUNET_TIME_UNIT_FOREVER_REL;
1047   GNUNET_NETWORK_fdset_copy_native (wrs, &rs, max);
1048   GNUNET_NETWORK_fdset_copy_native (wws, &ws, max);
1049   GNUNET_NETWORK_fdset_copy_native (wes, &es, max);
1050   if (daemon_handle == plugin->http_server_daemon_v4)
1051   {
1052         if (plugin->http_server_task_v4 != GNUNET_SCHEDULER_NO_TASK)
1053         {
1054                 GNUNET_SCHEDULER_cancel(plugin->env->sched, plugin->http_server_task_v4);
1055                 plugin->http_server_daemon_v4 = GNUNET_SCHEDULER_NO_TASK;
1056         }
1057
1058     ret = GNUNET_SCHEDULER_add_select (plugin->env->sched,
1059                                        GNUNET_SCHEDULER_PRIORITY_DEFAULT,
1060                                        GNUNET_SCHEDULER_NO_TASK,
1061                                        tv,
1062                                        wrs,
1063                                        wws,
1064                                        &http_server_daemon_v4_run,
1065                                        plugin);
1066   }
1067   if (daemon_handle == plugin->http_server_daemon_v6)
1068   {
1069         if (plugin->http_server_task_v6 != GNUNET_SCHEDULER_NO_TASK)
1070         {
1071                 GNUNET_SCHEDULER_cancel(plugin->env->sched, plugin->http_server_task_v6);
1072                 plugin->http_server_task_v6 = GNUNET_SCHEDULER_NO_TASK;
1073         }
1074
1075     ret = GNUNET_SCHEDULER_add_select (plugin->env->sched,
1076                                        GNUNET_SCHEDULER_PRIORITY_DEFAULT,
1077                                        GNUNET_SCHEDULER_NO_TASK,
1078                                        tv,
1079                                        wrs,
1080                                        wws,
1081                                        &http_server_daemon_v6_run,
1082                                        plugin);
1083   }
1084   GNUNET_NETWORK_fdset_destroy (wrs);
1085   GNUNET_NETWORK_fdset_destroy (wws);
1086   GNUNET_NETWORK_fdset_destroy (wes);
1087   return ret;
1088 }
1089
1090 /**
1091  * Call MHD to process pending requests and then go back
1092  * and schedule the next run.
1093  */
1094 static void http_server_daemon_v4_run (void *cls,
1095                              const struct GNUNET_SCHEDULER_TaskContext *tc)
1096 {
1097   struct Plugin *plugin = cls;
1098
1099   GNUNET_assert(cls !=NULL);
1100   plugin->http_server_task_v4 = GNUNET_SCHEDULER_NO_TASK;
1101
1102   if (0 != (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN))
1103     return;
1104
1105   GNUNET_assert (MHD_YES == MHD_run (plugin->http_server_daemon_v4));
1106   plugin->http_server_task_v4 = http_server_daemon_prepare (plugin, plugin->http_server_daemon_v4);
1107   return;
1108 }
1109
1110
1111 /**
1112  * Call MHD to process pending requests and then go back
1113  * and schedule the next run.
1114  */
1115 static void http_server_daemon_v6_run (void *cls,
1116                              const struct GNUNET_SCHEDULER_TaskContext *tc)
1117 {
1118   struct Plugin *plugin = cls;
1119
1120   GNUNET_assert(cls !=NULL);
1121   plugin->http_server_task_v6 = GNUNET_SCHEDULER_NO_TASK;
1122
1123   if (0 != (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN))
1124     return;
1125
1126   GNUNET_assert (MHD_YES == MHD_run (plugin->http_server_daemon_v6));
1127   plugin->http_server_task_v6 = http_server_daemon_prepare (plugin, plugin->http_server_daemon_v6);
1128   return;
1129 }
1130
1131 static size_t curl_get_header_cb( void *ptr, size_t size, size_t nmemb, void *stream)
1132 {
1133   struct Session * ps = stream;
1134
1135   long http_result = 0;
1136   int res;
1137   /* Getting last http result code */
1138   GNUNET_assert(NULL!=ps);
1139   if (ps->recv_connected==GNUNET_NO)
1140   {
1141     res = curl_easy_getinfo(ps->recv_endpoint, CURLINFO_RESPONSE_CODE, &http_result);
1142     if (CURLE_OK == res)
1143     {
1144       if (http_result == 200)
1145       {
1146         ps->recv_connected = GNUNET_YES;
1147         ps->recv_active = GNUNET_YES;
1148 #if DEBUG_CONNECTIONS
1149         GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,"Connection %X: connected to recieve data\n",ps);
1150 #endif
1151         // Calling send_check_connections again since receive is established
1152         send_check_connections (ps->peercontext->plugin, ps);
1153       }
1154     }
1155   }
1156
1157 #if DEBUG_CURL
1158   char * tmp;
1159   size_t len = size * nmemb;
1160   tmp = NULL;
1161   if ((size * nmemb) < SIZE_MAX)
1162     tmp = GNUNET_malloc (len+1);
1163
1164   if ((tmp != NULL) && (len > 0))
1165   {
1166     memcpy(tmp,ptr,len);
1167     if (len>=2)
1168     {
1169       if (tmp[len-2] == 13)
1170         tmp[len-2]= '\0';
1171     }
1172     GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,"Connection %X: Header: %s\n",ps,tmp);
1173   }
1174   if (NULL != tmp)
1175     GNUNET_free (tmp);
1176 #endif
1177
1178   return size * nmemb;
1179 }
1180
1181 static size_t curl_put_header_cb( void *ptr, size_t size, size_t nmemb, void *stream)
1182 {
1183   struct Session * ps = stream;
1184
1185   char * tmp;
1186   size_t len = size * nmemb;
1187   long http_result = 0;
1188   int res;
1189
1190   /* Getting last http result code */
1191   GNUNET_assert(NULL!=ps);
1192   res = curl_easy_getinfo(ps->send_endpoint, CURLINFO_RESPONSE_CODE, &http_result);
1193   if (CURLE_OK == res)
1194   {
1195     if ((http_result == 100) && (ps->send_connected==GNUNET_NO))
1196     {
1197       ps->send_connected = GNUNET_YES;
1198       ps->send_active = GNUNET_YES;
1199 #if DEBUG_CONNECTIONS
1200       GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,"Connection %X: connected to send data\n",ps);
1201 #endif
1202     }
1203     if ((http_result == 200) && (ps->send_connected==GNUNET_YES))
1204     {
1205       ps->send_connected = GNUNET_NO;
1206       ps->send_active = GNUNET_NO;
1207 #if DEBUG_CONNECTIONS
1208       GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,"Connection %X: sending disconnected\n",ps);
1209 #endif
1210     }
1211   }
1212
1213   tmp = NULL;
1214   if ((size * nmemb) < SIZE_MAX)
1215     tmp = GNUNET_malloc (len+1);
1216
1217   if ((tmp != NULL) && (len > 0))
1218   {
1219     memcpy(tmp,ptr,len);
1220     if (len>=2)
1221     {
1222       if (tmp[len-2] == 13)
1223         tmp[len-2]= '\0';
1224     }
1225   }
1226   if (NULL != tmp)
1227     GNUNET_free (tmp);
1228
1229   return size * nmemb;
1230 }
1231
1232 /**
1233  * Callback method used with libcurl
1234  * Method is called when libcurl needs to read data during sending
1235  * @param stream pointer where to write data
1236  * @param size size of an individual element
1237  * @param nmemb count of elements that can be written to the buffer
1238  * @param ptr source pointer, passed to the libcurl handle
1239  * @return bytes written to stream
1240  */
1241 static size_t curl_send_cb(void *stream, size_t size, size_t nmemb, void *ptr)
1242 {
1243   struct Session * ps = ptr;
1244   struct HTTP_Message * msg = ps->pending_msgs_tail;
1245   size_t bytes_sent;
1246   size_t len;
1247
1248   if (ps->send_active == GNUNET_NO)
1249         return CURL_READFUNC_PAUSE;
1250
1251
1252   if ((ps->pending_msgs_tail == NULL) && (ps->send_active == GNUNET_YES))
1253   {
1254 #if DEBUG_CONNECTIONS
1255     GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,"Connection %X: No Message to send, pausing connection\n",ps);
1256 #endif
1257     ps->send_active = GNUNET_NO;
1258     return CURL_READFUNC_PAUSE;
1259   }
1260
1261   GNUNET_assert (msg!=NULL);
1262
1263   /* data to send */
1264   if (msg->pos < msg->size)
1265   {
1266     /* data fit in buffer */
1267     if ((msg->size - msg->pos) <= (size * nmemb))
1268     {
1269       len = (msg->size - msg->pos);
1270       memcpy(stream, &msg->buf[msg->pos], len);
1271       msg->pos += len;
1272       bytes_sent = len;
1273     }
1274     else
1275     {
1276       len = size*nmemb;
1277       memcpy(stream, &msg->buf[msg->pos], len);
1278       msg->pos += len;
1279       bytes_sent = len;
1280     }
1281   }
1282   /* no data to send */
1283   else
1284   {
1285     bytes_sent = 0;
1286   }
1287
1288   if ( msg->pos == msg->size)
1289   {
1290 #if DEBUG_CONNECTIONS
1291     GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,"Connection %X: Message with %u bytes sent, removing message from queue \n",ps, msg->pos);
1292 #endif
1293     /* Calling transmit continuation  */
1294     if (NULL != ps->pending_msgs_tail->transmit_cont)
1295       msg->transmit_cont (ps->pending_msgs_tail->transmit_cont_cls,&(ps->peercontext)->identity,GNUNET_OK);
1296     remove_http_message(ps, msg);
1297   }
1298   return bytes_sent;
1299 }
1300
1301 static void curl_receive_mst_cb  (void *cls,
1302                                 void *client,
1303                                 const struct GNUNET_MessageHeader *message)
1304 {
1305   struct Session *ps  = cls;
1306   GNUNET_assert(ps != NULL);
1307
1308   struct HTTP_PeerContext *pc = ps->peercontext;
1309   GNUNET_assert(pc != NULL);
1310 #if DEBUG_HTTP
1311   GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1312               "Connection %X: Forwarding message to transport service, type %u and size %u from `%s' (`%s')\n",
1313               ps,
1314               ntohs(message->type),
1315               ntohs(message->size),
1316               GNUNET_i2s(&(pc->identity)),http_plugin_address_to_string(NULL,ps->addr,ps->addrlen));
1317 #endif
1318   pc->plugin->env->receive (pc->plugin->env->cls,
1319                             &pc->identity,
1320                             message, 1, ps,
1321                             ps->addr,
1322                             ps->addrlen);
1323 }
1324
1325
1326 /**
1327 * Callback method used with libcurl
1328 * Method is called when libcurl needs to write data during sending
1329 * @param stream pointer where to write data
1330 * @param size size of an individual element
1331 * @param nmemb count of elements that can be written to the buffer
1332 * @param ptr destination pointer, passed to the libcurl handle
1333 * @return bytes read from stream
1334 */
1335 static size_t curl_receive_cb( void *stream, size_t size, size_t nmemb, void *ptr)
1336 {
1337   struct Session * ps = ptr;
1338 #if DEBUG_CONNECTIONS
1339   GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,"Connection %X: %u bytes received\n",ps, size*nmemb);
1340 #endif
1341   GNUNET_SERVER_mst_receive(ps->msgtok, ps, stream, size*nmemb, GNUNET_NO, GNUNET_NO);
1342   return (size * nmemb);
1343
1344 }
1345
1346 static void curl_perform (void *cls,
1347              const struct GNUNET_SCHEDULER_TaskContext *tc)
1348 {
1349   struct Plugin *plugin = cls;
1350   static unsigned int handles_last_run;
1351   int running;
1352   struct CURLMsg *msg;
1353   CURLMcode mret;
1354   struct Session *ps = NULL;
1355   struct HTTP_PeerContext *pc = NULL;
1356   struct HTTP_Message * cur_msg = NULL;
1357   long http_result;
1358   char * tmp;
1359
1360   GNUNET_assert(cls !=NULL);
1361
1362   plugin->http_curl_task = GNUNET_SCHEDULER_NO_TASK;
1363   if (0 != (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN))
1364     return;
1365
1366   do
1367     {
1368       running = 0;
1369       mret = curl_multi_perform (plugin->multi_handle, &running);
1370       if ((running < handles_last_run) && (running>0))
1371         {
1372           do
1373             {
1374
1375               msg = curl_multi_info_read (plugin->multi_handle, &running);
1376               if (running == 0)
1377                   break;
1378               /* get session for affected curl handle */
1379               GNUNET_assert ( msg->easy_handle != NULL );
1380               curl_easy_getinfo(msg->easy_handle, CURLINFO_PRIVATE, &tmp);
1381               ps = (struct Session *) tmp;
1382               GNUNET_assert ( ps != NULL );
1383               pc = ps->peercontext;
1384               GNUNET_assert ( pc != NULL );
1385               switch (msg->msg)
1386                 {
1387
1388                 case CURLMSG_DONE:
1389                   if ( (msg->data.result != CURLE_OK) &&
1390                        (msg->data.result != CURLE_GOT_NOTHING) )
1391                   {
1392                     /* sending msg failed*/
1393                     if (msg->easy_handle == ps->send_endpoint)
1394                     {
1395 #if DEBUG_CONNECTIONS
1396                       GNUNET_log(GNUNET_ERROR_TYPE_INFO,
1397                                  _("Connection %X: HTTP PUT to peer `%s' (`%s') failed: `%s' `%s'\n"),
1398                                  ps,
1399                                  GNUNET_i2s(&pc->identity),
1400                                  http_plugin_address_to_string(NULL, ps->addr, ps->addrlen),
1401                                  "curl_multi_perform",
1402                                  curl_easy_strerror (msg->data.result));
1403 #endif
1404                       ps->send_connected = GNUNET_NO;
1405                       ps->send_active = GNUNET_NO;
1406                       curl_multi_remove_handle(plugin->multi_handle,ps->send_endpoint);
1407                       //curl_easy_cleanup(ps->send_endpoint);
1408                       //ps->send_endpoint=NULL;
1409                       cur_msg = ps->pending_msgs_tail;
1410                       if (( NULL != cur_msg) && ( NULL != cur_msg->transmit_cont))
1411                         cur_msg->transmit_cont (cur_msg->transmit_cont_cls,&pc->identity,GNUNET_SYSERR);
1412                     }
1413                     /* GET connection failed */
1414                     if (msg->easy_handle == ps->recv_endpoint)
1415                     {
1416 #if DEBUG_CONNECTIONS
1417                       GNUNET_log(GNUNET_ERROR_TYPE_INFO,
1418                            _("Connection %X: HTTP GET to peer `%s' (`%s') failed: `%s' `%s'\n"),
1419                            ps,
1420                            GNUNET_i2s(&pc->identity),
1421                            http_plugin_address_to_string(NULL, ps->addr, ps->addrlen),
1422                            "curl_multi_perform",
1423                            curl_easy_strerror (msg->data.result));
1424 #endif
1425                       ps->recv_connected = GNUNET_NO;
1426                       ps->recv_active = GNUNET_NO;
1427                       curl_multi_remove_handle(plugin->multi_handle,ps->recv_endpoint);
1428                       //curl_easy_cleanup(ps->recv_endpoint);
1429                       //ps->recv_endpoint=NULL;
1430                     }
1431                   }
1432                   else
1433                   {
1434                     if (msg->easy_handle == ps->send_endpoint)
1435                     {
1436                       GNUNET_assert (CURLE_OK == curl_easy_getinfo(msg->easy_handle, CURLINFO_RESPONSE_CODE, &http_result));
1437 #if DEBUG_CONNECTIONS
1438                       GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1439                                   "Connection %X: HTTP PUT connection to peer `%s' (`%s') was closed with HTTP code %u\n",
1440                                    ps,
1441                                    GNUNET_i2s(&pc->identity),
1442                                    http_plugin_address_to_string(NULL, ps->addr, ps->addrlen),
1443                                    http_result);
1444 #endif
1445                       /* Calling transmit continuation  */
1446                       cur_msg = ps->pending_msgs_tail;
1447                       if (( NULL != cur_msg) && (NULL != cur_msg->transmit_cont))
1448                       {
1449                         /* HTTP 1xx : Last message before here was informational */
1450                         if ((http_result >=100) && (http_result < 200))
1451                           cur_msg->transmit_cont (cur_msg->transmit_cont_cls,&pc->identity,GNUNET_OK);
1452                         /* HTTP 2xx: successful operations */
1453                         if ((http_result >=200) && (http_result < 300))
1454                           cur_msg->transmit_cont (cur_msg->transmit_cont_cls,&pc->identity,GNUNET_OK);
1455                         /* HTTP 3xx..5xx: error */
1456                         if ((http_result >=300) && (http_result < 600))
1457                           cur_msg->transmit_cont (cur_msg->transmit_cont_cls,&pc->identity,GNUNET_SYSERR);
1458                       }
1459                       ps->send_connected = GNUNET_NO;
1460                       ps->send_active = GNUNET_NO;
1461                       curl_multi_remove_handle(plugin->multi_handle,ps->send_endpoint);
1462                       //curl_easy_cleanup(ps->send_endpoint);
1463                       //ps->send_endpoint =NULL;
1464                     }
1465                     if (msg->easy_handle == ps->recv_endpoint)
1466                     {
1467 #if DEBUG_CONNECTIONS
1468                       GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1469                                   "Connection %X: HTTP GET connection to peer `%s' (`%s') was closed with HTTP code %u\n",
1470                                    ps,
1471                                    GNUNET_i2s(&pc->identity),
1472                                    http_plugin_address_to_string(NULL, ps->addr, ps->addrlen),
1473                                    http_result);
1474 #endif
1475                       ps->recv_connected = GNUNET_NO;
1476                       ps->recv_active = GNUNET_NO;
1477                       curl_multi_remove_handle(plugin->multi_handle,ps->recv_endpoint);
1478                       //curl_easy_cleanup(ps->recv_endpoint);
1479                       //ps->recv_endpoint=NULL;
1480                     }
1481                   }
1482                   if ((ps->recv_connected == GNUNET_NO) && (ps->send_connected == GNUNET_NO))
1483                     remove_session (pc, ps, GNUNET_YES, GNUNET_SYSERR);
1484                   break;
1485                 default:
1486                   break;
1487                 }
1488
1489             }
1490           while ( (running > 0) );
1491         }
1492       handles_last_run = running;
1493     }
1494   while (mret == CURLM_CALL_MULTI_PERFORM);
1495   curl_schedule(plugin);
1496 }
1497
1498
1499 /**
1500  * Function setting up file descriptors and scheduling task to run
1501  * @param ses session to send data to
1502  * @return GNUNET_SYSERR for hard failure, GNUNET_OK for ok
1503  */
1504 static int curl_schedule(void *cls)
1505 {
1506   struct Plugin *plugin = cls;
1507   fd_set rs;
1508   fd_set ws;
1509   fd_set es;
1510   int max;
1511   struct GNUNET_NETWORK_FDSet *grs;
1512   struct GNUNET_NETWORK_FDSet *gws;
1513   long to;
1514   CURLMcode mret;
1515
1516   GNUNET_assert(cls !=NULL);
1517
1518   /* Cancel previous scheduled task */
1519   if (plugin->http_curl_task !=  GNUNET_SCHEDULER_NO_TASK)
1520   {
1521           GNUNET_SCHEDULER_cancel(plugin->env->sched, plugin->http_curl_task);
1522           plugin->http_curl_task = GNUNET_SCHEDULER_NO_TASK;
1523   }
1524   max = -1;
1525   FD_ZERO (&rs);
1526   FD_ZERO (&ws);
1527   FD_ZERO (&es);
1528   mret = curl_multi_fdset (plugin->multi_handle, &rs, &ws, &es, &max);
1529   if (mret != CURLM_OK)
1530     {
1531       GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
1532                   _("%s failed at %s:%d: `%s'\n"),
1533                   "curl_multi_fdset", __FILE__, __LINE__,
1534                   curl_multi_strerror (mret));
1535       return GNUNET_SYSERR;
1536     }
1537   mret = curl_multi_timeout (plugin->multi_handle, &to);
1538   if (mret != CURLM_OK)
1539     {
1540       GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
1541                   _("%s failed at %s:%d: `%s'\n"),
1542                   "curl_multi_timeout", __FILE__, __LINE__,
1543                   curl_multi_strerror (mret));
1544       return GNUNET_SYSERR;
1545     }
1546
1547   grs = GNUNET_NETWORK_fdset_create ();
1548   gws = GNUNET_NETWORK_fdset_create ();
1549   GNUNET_NETWORK_fdset_copy_native (grs, &rs, max + 1);
1550   GNUNET_NETWORK_fdset_copy_native (gws, &ws, max + 1);
1551   plugin->http_curl_task = GNUNET_SCHEDULER_add_select (plugin->env->sched,
1552                                    GNUNET_SCHEDULER_PRIORITY_DEFAULT,
1553                                    GNUNET_SCHEDULER_NO_TASK,
1554                                    GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_SECONDS, 0),
1555                                    grs,
1556                                    gws,
1557                                    &curl_perform,
1558                                    plugin);
1559   GNUNET_NETWORK_fdset_destroy (gws);
1560   GNUNET_NETWORK_fdset_destroy (grs);
1561   return GNUNET_OK;
1562 }
1563
1564 /**
1565  * Function setting up curl handle and selecting message to send
1566  * @param cls plugin
1567  * @param ses session to send data to
1568  * @param con connection
1569  * @return GNUNET_SYSERR on failure, GNUNET_NO if connecting, GNUNET_YES if ok
1570  */
1571 static ssize_t send_check_connections (void *cls, struct Session *ps)
1572 {
1573   struct Plugin *plugin = cls;
1574   CURLMcode mret;
1575   struct HTTP_Message * msg;
1576
1577   struct GNUNET_TIME_Relative timeout = GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT;
1578
1579   GNUNET_assert(cls !=NULL);
1580
1581   if (ps->direction == OUTBOUND)
1582   {
1583     /* RECV DIRECTION */
1584     /* Check if session is connected to receive data, otherwise connect to peer */
1585     if (ps->recv_connected == GNUNET_NO)
1586     {
1587         int fresh = GNUNET_NO;
1588         if (ps->recv_endpoint == NULL)
1589         {
1590             fresh = GNUNET_YES;
1591                 ps->recv_endpoint = curl_easy_init();
1592         }
1593 #if DEBUG_CURL
1594         curl_easy_setopt(ps->recv_endpoint, CURLOPT_VERBOSE, 1L);
1595 #endif
1596         curl_easy_setopt(ps->recv_endpoint, CURLOPT_URL, ps->url);
1597         curl_easy_setopt(ps->recv_endpoint, CURLOPT_HEADERFUNCTION, &curl_get_header_cb);
1598         curl_easy_setopt(ps->recv_endpoint, CURLOPT_WRITEHEADER, ps);
1599         curl_easy_setopt(ps->recv_endpoint, CURLOPT_READFUNCTION, curl_send_cb);
1600         curl_easy_setopt(ps->recv_endpoint, CURLOPT_READDATA, ps);
1601         curl_easy_setopt(ps->recv_endpoint, CURLOPT_WRITEFUNCTION, curl_receive_cb);
1602         curl_easy_setopt(ps->recv_endpoint, CURLOPT_WRITEDATA, ps);
1603         curl_easy_setopt(ps->recv_endpoint, CURLOPT_TIMEOUT, (long) timeout.value);
1604         curl_easy_setopt(ps->recv_endpoint, CURLOPT_PRIVATE, ps);
1605         curl_easy_setopt(ps->recv_endpoint, CURLOPT_CONNECTTIMEOUT, HTTP_CONNECT_TIMEOUT);
1606         curl_easy_setopt(ps->recv_endpoint, CURLOPT_BUFFERSIZE, GNUNET_SERVER_MAX_MESSAGE_SIZE);
1607
1608         if (fresh==GNUNET_YES)
1609         {
1610                         mret = curl_multi_add_handle(plugin->multi_handle, ps->recv_endpoint);
1611                         if (mret != CURLM_OK)
1612                         {
1613                           GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
1614                                                   _("Connection: %X: %s failed at %s:%d: `%s'\n"),
1615                                                   ps,
1616                                                   "curl_multi_add_handle", __FILE__, __LINE__,
1617                                                   curl_multi_strerror (mret));
1618                           return GNUNET_SYSERR;
1619                         }
1620         }
1621         if (curl_schedule (plugin) == GNUNET_SYSERR)
1622         {
1623 #if DEBUG_CONNECTIONS
1624         GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,"Connection %X: could not schedule curl task\n",ps);
1625 #endif
1626                 return GNUNET_SYSERR;
1627         }
1628 #if DEBUG_CONNECTIONS
1629         GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,"Connection %X: inbound not connected, initiating connection\n",ps);
1630 #endif
1631     }
1632
1633     /* waiting for receive direction */
1634     if (ps->recv_connected==GNUNET_NO)
1635       return GNUNET_NO;
1636
1637     /* SEND DIRECTION */
1638     /* Check if session is connected to send data, otherwise connect to peer */
1639     if ((ps->send_connected == GNUNET_YES) && (ps->send_endpoint!= NULL))
1640     {
1641       if (ps->send_active == GNUNET_YES)
1642       {
1643 #if DEBUG_CONNECTIONS
1644         GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,"Connection %X: outbound active, enqueueing message\n",ps);
1645 #endif
1646         return GNUNET_YES;
1647       }
1648       if (ps->send_active == GNUNET_NO)
1649       {
1650 #if DEBUG_CONNECTIONS
1651         GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,"Connection %X: outbound paused, unpausing existing connection and enqueueing message\n",ps);
1652 #endif
1653         if (CURLE_OK == curl_easy_pause(ps->send_endpoint,CURLPAUSE_CONT))
1654         {
1655                         ps->send_active=GNUNET_YES;
1656                         return GNUNET_YES;
1657         }
1658         else
1659                 return GNUNET_SYSERR;
1660       }
1661     }
1662     /* not connected, initiate connection */
1663     if (ps->send_connected==GNUNET_NO)
1664     {
1665         int fresh = GNUNET_NO;
1666         if (NULL == ps->send_endpoint)
1667         {
1668                 ps->send_endpoint = curl_easy_init();
1669                 fresh = GNUNET_YES;
1670         }
1671                 GNUNET_assert (ps->send_endpoint != NULL);
1672                 GNUNET_assert (NULL != ps->pending_msgs_tail);
1673 #if DEBUG_CONNECTIONS
1674                 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,"Connection %X: outbound not connected, initiating connection\n",ps);
1675 #endif
1676                 ps->send_active = GNUNET_NO;
1677                 msg = ps->pending_msgs_tail;
1678
1679 #if DEBUG_CURL
1680                 curl_easy_setopt(ps->send_endpoint, CURLOPT_VERBOSE, 1L);
1681 #endif
1682                 curl_easy_setopt(ps->send_endpoint, CURLOPT_URL, ps->url);
1683                 curl_easy_setopt(ps->send_endpoint, CURLOPT_PUT, 1L);
1684                 curl_easy_setopt(ps->send_endpoint, CURLOPT_HEADERFUNCTION, &curl_put_header_cb);
1685                 curl_easy_setopt(ps->send_endpoint, CURLOPT_WRITEHEADER, ps);
1686                 curl_easy_setopt(ps->send_endpoint, CURLOPT_READFUNCTION, curl_send_cb);
1687                 curl_easy_setopt(ps->send_endpoint, CURLOPT_READDATA, ps);
1688                 curl_easy_setopt(ps->send_endpoint, CURLOPT_WRITEFUNCTION, curl_receive_cb);
1689                 curl_easy_setopt(ps->send_endpoint, CURLOPT_READDATA, ps);
1690                 curl_easy_setopt(ps->send_endpoint, CURLOPT_TIMEOUT, (long) timeout.value);
1691                 curl_easy_setopt(ps->send_endpoint, CURLOPT_PRIVATE, ps);
1692                 curl_easy_setopt(ps->send_endpoint, CURLOPT_CONNECTTIMEOUT, HTTP_CONNECT_TIMEOUT);
1693                 curl_easy_setopt(ps->send_endpoint, CURLOPT_BUFFERSIZE, GNUNET_SERVER_MAX_MESSAGE_SIZE);
1694
1695                 if (fresh==GNUNET_YES)
1696                 {
1697                         mret = curl_multi_add_handle(plugin->multi_handle, ps->send_endpoint);
1698                         if (mret != CURLM_OK)
1699                         {
1700                           GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
1701                                                   _("Connection: %X: %s failed at %s:%d: `%s'\n"),
1702                                                   ps,
1703                                                   "curl_multi_add_handle", __FILE__, __LINE__,
1704                                                   curl_multi_strerror (mret));
1705                           return GNUNET_SYSERR;
1706                         }
1707                 }
1708     }
1709     if (curl_schedule (plugin) == GNUNET_SYSERR)
1710         return GNUNET_SYSERR;
1711     return GNUNET_YES;
1712   }
1713   if (ps->direction == INBOUND)
1714   {
1715     GNUNET_assert (NULL != ps->pending_msgs_tail);
1716     if ((ps->recv_connected==GNUNET_YES) && (ps->send_connected==GNUNET_YES) &&
1717         (ps->recv_force_disconnect==GNUNET_NO) && (ps->recv_force_disconnect==GNUNET_NO))
1718         return GNUNET_YES;
1719   }
1720   return GNUNET_SYSERR;
1721 }
1722
1723 static struct Session * send_select_session (void * cls, struct HTTP_PeerContext *pc, const void * addr, size_t addrlen, int force_address, struct Session * session)
1724 {
1725         struct Session * tmp = NULL;
1726         int addr_given = GNUNET_NO;
1727
1728         if ((addr!=NULL) && (addrlen>0))
1729                 addr_given = GNUNET_YES;
1730
1731         if (force_address == GNUNET_YES)
1732         {
1733                 /* check session given as argument */
1734                 if ((session != NULL) && (addr_given == GNUNET_YES))
1735                 {
1736                       if (0 == memcmp(session->addr, addr, addrlen))
1737                       {
1738                         /* connection can not be used, since it is disconnected */
1739                         if ((session->recv_force_disconnect==GNUNET_NO) && (session->send_force_disconnect==GNUNET_NO))
1740                         {
1741 #if DEBUG_SESSION_SELECTION
1742                                   GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,"Session %X selected: Using session passed by transport to send to forced address \n", session);
1743 #endif
1744                                 return session;
1745                         }
1746                       }
1747                 }
1748                 /* check last session used */
1749                 if ((pc->last_session != NULL)&& (addr_given == GNUNET_YES))
1750                 {
1751                       if (0 == memcmp(pc->last_session->addr, addr, addrlen))
1752                       {
1753                         /* connection can not be used, since it is disconnected */
1754                         if ((pc->last_session->recv_force_disconnect==GNUNET_NO) && (pc->last_session->send_force_disconnect==GNUNET_NO))
1755                         {
1756 #if DEBUG_SESSION_SELECTION
1757                                   GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,"Session %X selected: Using last session used to send to forced address \n", pc->last_session);
1758 #endif
1759                                 return pc->last_session;
1760                         }
1761                       }
1762                 }
1763                 /* find session in existing sessions */
1764                 tmp = pc->head;
1765                 while ((tmp!=NULL) && (addr_given == GNUNET_YES))
1766                 {
1767
1768                           if (0 == memcmp(tmp->addr, addr, addrlen))
1769                       {
1770                         /* connection can not be used, since it is disconnected */
1771                         if ((tmp->recv_force_disconnect==GNUNET_NO) && (tmp->send_force_disconnect==GNUNET_NO))
1772                         {
1773 #if DEBUG_SESSION_SELECTION
1774                                   GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,"Session %X selected: Using existing session to send to forced address \n", session);
1775 #endif
1776                                   return session;
1777                         }
1778
1779                       }
1780                           tmp=tmp->next;
1781                 }
1782                 /* no session to use */
1783                 return NULL;
1784         }
1785         if ((force_address == GNUNET_NO) || (force_address == GNUNET_SYSERR))
1786         {
1787                 /* check session given as argument */
1788                 if (session != NULL)
1789                 {
1790                         /* connection can not be used, since it is disconnected */
1791                         if ((session->recv_force_disconnect==GNUNET_NO) && (session->send_force_disconnect==GNUNET_NO))
1792                         {
1793 #if DEBUG_SESSION_SELECTION
1794                                   GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,"Session %X selected: Using session passed by transport to send not-forced address \n", session);
1795 #endif
1796                                   return session;
1797                         }
1798
1799                 }
1800                 /* check last session used */
1801                 if (pc->last_session != NULL)
1802                 {
1803                         /* connection can not be used, since it is disconnected */
1804                         if ((pc->last_session->recv_force_disconnect==GNUNET_NO) && (pc->last_session->send_force_disconnect==GNUNET_NO))
1805                         {
1806 #if DEBUG_SESSION_SELECTION
1807                                   GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,"Session %X selected: Using last session to send to not-forced address \n", pc->last_session);
1808 #endif
1809                                 return pc->last_session;
1810                         }
1811                 }
1812                 /* find session in existing sessions */
1813                 tmp = pc->head;
1814                 while (tmp!=NULL)
1815                 {
1816                         /* connection can not be used, since it is disconnected */
1817                         if ((tmp->recv_force_disconnect==GNUNET_NO) && (tmp->send_force_disconnect==GNUNET_NO))
1818                         {
1819 #if DEBUG_SESSION_SELECTION
1820                                   GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,"Session %X selected: Using existing session to send to not-forced address \n", tmp);
1821 #endif
1822                                 return tmp;
1823                         }
1824                         tmp=tmp->next;
1825                 }
1826                 return NULL;
1827         }
1828         return NULL;
1829 }
1830
1831 /**
1832  * Function that can be used by the transport service to transmit
1833  * a message using the plugin.   Note that in the case of a
1834  * peer disconnecting, the continuation MUST be called
1835  * prior to the disconnect notification itself.  This function
1836  * will be called with this peer's HELLO message to initiate
1837  * a fresh connection to another peer.
1838  *
1839  * @param cls closure
1840  * @param target who should receive this message
1841  * @param msgbuf the message to transmit
1842  * @param msgbuf_size number of bytes in 'msgbuf'
1843  * @param priority how important is the message (most plugins will
1844  *                 ignore message priority and just FIFO)
1845  * @param timeout how long to wait at most for the transmission (does not
1846  *                require plugins to discard the message after the timeout,
1847  *                just advisory for the desired delay; most plugins will ignore
1848  *                this as well)
1849  * @param session which session must be used (or NULL for "any")
1850  * @param addr the address to use (can be NULL if the plugin
1851  *                is "on its own" (i.e. re-use existing TCP connection))
1852  * @param addrlen length of the address in bytes
1853  * @param force_address GNUNET_YES if the plugin MUST use the given address,
1854  *                GNUNET_NO means the plugin may use any other address and
1855  *                GNUNET_SYSERR means that only reliable existing
1856  *                bi-directional connections should be used (regardless
1857  *                of address)
1858  * @param cont continuation to call once the message has
1859  *        been transmitted (or if the transport is ready
1860  *        for the next transmission call; or if the
1861  *        peer disconnected...); can be NULL
1862  * @param cont_cls closure for cont
1863  * @return number of bytes used (on the physical network, with overheads);
1864  *         -1 on hard errors (i.e. address invalid); 0 is a legal value
1865  *         and does NOT mean that the message was not transmitted (DV)
1866  */
1867 static ssize_t
1868 http_plugin_send (void *cls,
1869                   const struct GNUNET_PeerIdentity *target,
1870                   const char *msgbuf,
1871                   size_t msgbuf_size,
1872                   unsigned int priority,
1873                   struct GNUNET_TIME_Relative to,
1874                   struct Session *session,
1875                   const void *addr,
1876                   size_t addrlen,
1877                   int force_address,
1878                   GNUNET_TRANSPORT_TransmitContinuation cont,
1879                   void *cont_cls)
1880 {
1881   struct Plugin *plugin = cls;
1882   struct HTTP_Message *msg;
1883   struct HTTP_PeerContext * pc;
1884   struct Session * ps = NULL;
1885
1886   GNUNET_assert(cls !=NULL);
1887
1888 #if DEBUG_HTTP
1889   char * force = GNUNET_malloc(40);
1890   if (force_address == GNUNET_YES)
1891     strcpy(force,"forced addr.");
1892   if (force_address == GNUNET_NO)
1893     strcpy(force,"any addr.");
1894   if (force_address == GNUNET_SYSERR)
1895     strcpy(force,"reliable bi-direc. address addr.");
1896
1897   GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,"Transport tells me to send %u bytes to `%s' using %s (%s) and session: %X\n",
1898                                       msgbuf_size,
1899                                       GNUNET_i2s(target),
1900                                       force,
1901                                       http_plugin_address_to_string(NULL, addr, addrlen),
1902                                       session);
1903
1904   GNUNET_free(force);
1905 #endif
1906
1907   pc = GNUNET_CONTAINER_multihashmap_get (plugin->peers, &target->hashPubKey);
1908   /* Peer unknown */
1909   if (pc==NULL)
1910   {
1911     pc = GNUNET_malloc(sizeof (struct HTTP_PeerContext));
1912     pc->plugin = plugin;
1913     pc->session_id_counter=1;
1914     pc->last_session = NULL;
1915     memcpy(&pc->identity, target, sizeof(struct GNUNET_PeerIdentity));
1916     GNUNET_CONTAINER_multihashmap_put(plugin->peers, &pc->identity.hashPubKey, pc, GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY);
1917     GNUNET_STATISTICS_update (plugin->env->stats,
1918                             gettext_noop ("# HTTP peers active"),
1919                             1,
1920                             GNUNET_NO);
1921   }
1922
1923   ps = send_select_session (plugin, pc, addr, addrlen, force_address, session);
1924
1925   /* session not existing, but address forced -> creating new session */
1926   if (ps==NULL)
1927   {
1928     if ((addr!=NULL) && (addrlen!=0))
1929     {
1930       ps = GNUNET_malloc(sizeof (struct Session));
1931 #if DEBUG_SESSION_SELECTION
1932       if (force_address == GNUNET_YES)
1933         GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,"No existing connection & forced address: creating new session %X to peer %s\n", ps, GNUNET_i2s(target));
1934       if (force_address != GNUNET_YES)
1935         GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,"No existing connection: creating new session %X to peer %s\n", ps, GNUNET_i2s(target));
1936 #endif
1937       if ((addrlen!=0) && (addr!=NULL))
1938       {
1939       ps->addr = GNUNET_malloc(addrlen);
1940       memcpy(ps->addr,addr,addrlen);
1941       ps->addrlen = addrlen;
1942       }
1943       else
1944       {
1945         ps->addr = NULL;
1946         ps->addrlen = 0;
1947       }
1948       ps->direction=OUTBOUND;
1949       ps->recv_connected = GNUNET_NO;
1950       ps->recv_force_disconnect = GNUNET_NO;
1951       ps->send_connected = GNUNET_NO;
1952       ps->send_force_disconnect = GNUNET_NO;
1953       ps->pending_msgs_head = NULL;
1954       ps->pending_msgs_tail = NULL;
1955       ps->peercontext=pc;
1956       ps->session_id = pc->session_id_counter;
1957       pc->session_id_counter++;
1958       ps->url = create_url (plugin, ps->addr, ps->addrlen, ps->session_id);
1959       if (ps->msgtok == NULL)
1960         ps->msgtok = GNUNET_SERVER_mst_create (&curl_receive_mst_cb, ps);
1961       GNUNET_CONTAINER_DLL_insert(pc->head,pc->tail,ps);
1962 /* FIXME */
1963
1964       GNUNET_STATISTICS_update (plugin->env->stats,
1965                             gettext_noop ("# HTTP outbound sessions for peers active"),
1966                             1,
1967                             GNUNET_NO);
1968     }
1969     else
1970     {
1971 #if DEBUG_HTTP
1972       GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,"No existing session found & and no address given: no way to send this message to peer `%s'!\n", GNUNET_i2s(target));
1973 #endif
1974       return GNUNET_SYSERR;
1975     }
1976   }
1977
1978   /* create msg */
1979   msg = GNUNET_malloc (sizeof (struct HTTP_Message) + msgbuf_size);
1980   msg->next = NULL;
1981   msg->size = msgbuf_size;
1982   msg->pos = 0;
1983   msg->buf = (char *) &msg[1];
1984   msg->transmit_cont = cont;
1985   msg->transmit_cont_cls = cont_cls;
1986   memcpy (msg->buf,msgbuf, msgbuf_size);
1987   GNUNET_CONTAINER_DLL_insert(ps->pending_msgs_head,ps->pending_msgs_tail,msg);
1988
1989   if (send_check_connections (plugin, ps) != GNUNET_SYSERR)
1990   {
1991           if (force_address != GNUNET_YES)
1992                   pc->last_session = ps;
1993
1994           if (pc->last_session==NULL)
1995                   pc->last_session = ps;
1996           return msg->size;
1997   }
1998   else
1999           return GNUNET_SYSERR;
2000 }
2001
2002
2003
2004 /**
2005  * Function that can be used to force the plugin to disconnect
2006  * from the given peer and cancel all previous transmissions
2007  * (and their continuationc).
2008  *
2009  * @param cls closure
2010  * @param target peer from which to disconnect
2011  */
2012 static void
2013 http_plugin_disconnect (void *cls,
2014                             const struct GNUNET_PeerIdentity *target)
2015 {
2016
2017
2018   struct Plugin *plugin = cls;
2019   struct HTTP_PeerContext *pc = NULL;
2020   struct Session *ps = NULL;
2021   //struct Session *tmp = NULL;
2022
2023   pc = GNUNET_CONTAINER_multihashmap_get (plugin->peers, &target->hashPubKey);
2024   if (pc==NULL)
2025     return;
2026   ps = pc->head;
2027
2028   while (ps!=NULL)
2029   {
2030     /* Telling transport that session is getting disconnected */
2031     plugin->env->session_end(plugin, target, ps);
2032     if (ps->direction==OUTBOUND)
2033     {
2034       if (ps->send_endpoint!=NULL)
2035       {
2036         //GNUNET_assert(CURLM_OK == curl_multi_remove_handle(plugin->multi_handle,ps->send_endpoint));
2037         //curl_easy_cleanup(ps->send_endpoint);
2038         //ps->send_endpoint=NULL;
2039         ps->send_force_disconnect = GNUNET_YES;
2040       }
2041       if (ps->recv_endpoint!=NULL)
2042       {
2043        //GNUNET_assert(CURLM_OK == curl_multi_remove_handle(plugin->multi_handle,ps->recv_endpoint));
2044        //curl_easy_cleanup(ps->recv_endpoint);
2045        //ps->recv_endpoint=NULL;
2046        ps->recv_force_disconnect = GNUNET_YES;
2047       }
2048     }
2049
2050     if (ps->direction==INBOUND)
2051     {
2052       ps->recv_force_disconnect = GNUNET_YES;
2053       ps->send_force_disconnect = GNUNET_YES;
2054     }
2055
2056     while (ps->pending_msgs_head!=NULL)
2057     {
2058       remove_http_message(ps, ps->pending_msgs_head);
2059     }
2060     ps->recv_active = GNUNET_NO;
2061     ps->send_active = GNUNET_NO;
2062     ps=ps->next;
2063   }
2064 }
2065
2066
2067 /**
2068  * Convert the transports address to a nice, human-readable
2069  * format.
2070  *
2071  * @param cls closure
2072  * @param type name of the transport that generated the address
2073  * @param addr one of the addresses of the host, NULL for the last address
2074  *        the specific address format depends on the transport
2075  * @param addrlen length of the address
2076  * @param numeric should (IP) addresses be displayed in numeric form?
2077  * @param timeout after how long should we give up?
2078  * @param asc function to call on each string
2079  * @param asc_cls closure for asc
2080  */
2081 static void
2082 http_plugin_address_pretty_printer (void *cls,
2083                                         const char *type,
2084                                         const void *addr,
2085                                         size_t addrlen,
2086                                         int numeric,
2087                                         struct GNUNET_TIME_Relative timeout,
2088                                         GNUNET_TRANSPORT_AddressStringCallback
2089                                         asc, void *asc_cls)
2090 {
2091   const struct IPv4HttpAddress *t4;
2092   const struct IPv6HttpAddress *t6;
2093   struct sockaddr_in a4;
2094   struct sockaddr_in6 a6;
2095   char * address;
2096   char * ret;
2097   unsigned int port;
2098   unsigned int res;
2099
2100   GNUNET_assert(cls !=NULL);
2101   if (addrlen == sizeof (struct IPv6HttpAddress))
2102   {
2103     address = GNUNET_malloc (INET6_ADDRSTRLEN);
2104     t6 = addr;
2105     a6.sin6_addr = t6->ipv6_addr;
2106     inet_ntop(AF_INET6, &(a6.sin6_addr),address,INET6_ADDRSTRLEN);
2107     port = ntohs(t6->u6_port);
2108   }
2109   else if (addrlen == sizeof (struct IPv4HttpAddress))
2110   {
2111     address = GNUNET_malloc (INET_ADDRSTRLEN);
2112     t4 = addr;
2113     a4.sin_addr.s_addr =  t4->ipv4_addr;
2114     inet_ntop(AF_INET, &(a4.sin_addr),address,INET_ADDRSTRLEN);
2115     port = ntohs(t4->u_port);
2116   }
2117   else
2118   {
2119     /* invalid address */
2120     GNUNET_break_op (0);
2121     asc (asc_cls, NULL);
2122     return;
2123   }
2124   res = GNUNET_asprintf(&ret,"%s://%s:%u/", PROTOCOL_PREFIX, address, port);
2125   GNUNET_free (address);
2126   GNUNET_assert(res != 0);
2127   asc (asc_cls, ret);
2128   GNUNET_free_non_null (ret);
2129 }
2130
2131
2132
2133 /**
2134  * Another peer has suggested an address for this
2135  * peer and transport plugin.  Check that this could be a valid
2136  * address.  If so, consider adding it to the list
2137  * of addresses.
2138  *
2139  * @param cls closure
2140  * @param addr pointer to the address
2141  * @param addrlen length of addr
2142  * @return GNUNET_OK if this is a plausible address for this peer
2143  *         and transport
2144  */
2145 static int
2146 http_plugin_address_suggested (void *cls,
2147                                const void *addr, size_t addrlen)
2148 {
2149   struct Plugin *plugin = cls;
2150   struct IPv4HttpAddress *v4;
2151   struct IPv6HttpAddress *v6;
2152   unsigned int port;
2153
2154   GNUNET_assert(cls !=NULL);
2155   if ((addrlen != sizeof (struct IPv4HttpAddress)) &&
2156       (addrlen != sizeof (struct IPv6HttpAddress)))
2157     {
2158       return GNUNET_SYSERR;
2159     }
2160   if (addrlen == sizeof (struct IPv4HttpAddress))
2161     {
2162       v4 = (struct IPv4HttpAddress *) addr;
2163       /* Not skipping loopback
2164       if (INADDR_LOOPBACK == ntohl(v4->ipv4_addr))
2165       {
2166         return GNUNET_SYSERR;
2167       } */
2168       port = ntohs (v4->u_port);
2169       if (port != plugin->port_inbound)
2170       {
2171         return GNUNET_SYSERR;
2172       }
2173     }
2174   if (addrlen == sizeof (struct IPv6HttpAddress))
2175     {
2176       v6 = (struct IPv6HttpAddress *) addr;
2177       if (IN6_IS_ADDR_LINKLOCAL (&v6->ipv6_addr))
2178         {
2179           return GNUNET_SYSERR;
2180         }
2181       port = ntohs (v6->u6_port);
2182       if (port != plugin->port_inbound)
2183       {
2184         return GNUNET_SYSERR;
2185       }
2186     }
2187
2188   return GNUNET_OK;
2189 }
2190
2191
2192 /**
2193  * Function called for a quick conversion of the binary address to
2194  * a numeric address.  Note that the caller must not free the
2195  * address and that the next call to this function is allowed
2196  * to override the address again.
2197  *
2198  * @param cls closure
2199  * @param addr binary address
2200  * @param addrlen length of the address
2201  * @return string representing the same address
2202  */
2203 static const char*
2204 http_plugin_address_to_string (void *cls,
2205                                    const void *addr,
2206                                    size_t addrlen)
2207 {
2208   const struct IPv4HttpAddress *t4;
2209   const struct IPv6HttpAddress *t6;
2210   struct sockaddr_in a4;
2211   struct sockaddr_in6 a6;
2212   char * address;
2213   char * ret;
2214   uint16_t port;
2215   unsigned int res;
2216
2217   if (addrlen == sizeof (struct IPv6HttpAddress))
2218     {
2219       address = GNUNET_malloc (INET6_ADDRSTRLEN);
2220       t6 = addr;
2221       a6.sin6_addr = t6->ipv6_addr;
2222       inet_ntop(AF_INET6, &(a6.sin6_addr),address,INET6_ADDRSTRLEN);
2223       port = ntohs(t6->u6_port);
2224     }
2225   else if (addrlen == sizeof (struct IPv4HttpAddress))
2226     {
2227       address = GNUNET_malloc (INET_ADDRSTRLEN);
2228       t4 = addr;
2229       a4.sin_addr.s_addr =  t4->ipv4_addr;
2230       inet_ntop(AF_INET, &(a4.sin_addr),address,INET_ADDRSTRLEN);
2231       port = ntohs(t4->u_port);
2232     }
2233   else
2234     {
2235       /* invalid address */
2236       return NULL;
2237     }
2238   res = GNUNET_asprintf(&ret,"%s:%u",address,port);
2239   GNUNET_free (address);
2240   GNUNET_assert(res != 0);
2241   return ret;
2242 }
2243
2244
2245 /**
2246  * Exit point from the plugin.
2247  */
2248 void *
2249 libgnunet_plugin_transport_http_done (void *cls)
2250 {
2251   struct GNUNET_TRANSPORT_PluginFunctions *api = cls;
2252   struct Plugin *plugin = api->cls;
2253   CURLMcode mret;
2254   GNUNET_assert(cls !=NULL);
2255
2256   if (plugin->http_server_daemon_v4 != NULL)
2257   {
2258     MHD_stop_daemon (plugin->http_server_daemon_v4);
2259     plugin->http_server_daemon_v4 = NULL;
2260   }
2261   if (plugin->http_server_daemon_v6 != NULL)
2262   {
2263     MHD_stop_daemon (plugin->http_server_daemon_v6);
2264     plugin->http_server_daemon_v6 = NULL;
2265   }
2266
2267   if ( plugin->http_server_task_v4 != GNUNET_SCHEDULER_NO_TASK)
2268   {
2269     GNUNET_SCHEDULER_cancel(plugin->env->sched, plugin->http_server_task_v4);
2270     plugin->http_server_task_v4 = GNUNET_SCHEDULER_NO_TASK;
2271   }
2272
2273   if ( plugin->http_server_task_v6 != GNUNET_SCHEDULER_NO_TASK)
2274   {
2275     GNUNET_SCHEDULER_cancel(plugin->env->sched, plugin->http_server_task_v6);
2276     plugin->http_server_task_v6 = GNUNET_SCHEDULER_NO_TASK;
2277   }
2278
2279
2280   /* free all peer information */
2281   if (plugin->peers!=NULL)
2282   {
2283           GNUNET_CONTAINER_multihashmap_iterate (plugin->peers,
2284                                                                                          &remove_peer_context_Iterator,
2285                                                                                          plugin);
2286           GNUNET_CONTAINER_multihashmap_destroy (plugin->peers);
2287   }
2288   if (plugin->multi_handle!=NULL)
2289   {
2290           mret = curl_multi_cleanup(plugin->multi_handle);
2291 #if DEBUG_HTTP
2292           if ( CURLM_OK != mret)
2293                 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,"curl multihandle clean up failed\n");
2294 #endif
2295           plugin->multi_handle = NULL;
2296   }
2297   curl_global_cleanup();
2298
2299   if ( plugin->http_curl_task != GNUNET_SCHEDULER_NO_TASK)
2300   {
2301     GNUNET_SCHEDULER_cancel(plugin->env->sched, plugin->http_curl_task);
2302     plugin->http_curl_task = GNUNET_SCHEDULER_NO_TASK;
2303   }
2304
2305   GNUNET_free_non_null (plugin->bind4_address);
2306   GNUNET_free_non_null (plugin->bind6_address);
2307   GNUNET_free_non_null(plugin->bind_hostname);
2308   GNUNET_free (plugin);
2309   GNUNET_free (api);
2310 #if DEBUG_HTTP
2311   GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,"Unload http plugin complete...\n");
2312 #endif
2313   return NULL;
2314 }
2315
2316
2317 /**
2318  * Entry point for the plugin.
2319  */
2320 void *
2321 libgnunet_plugin_transport_http_init (void *cls)
2322 {
2323   struct GNUNET_TRANSPORT_PluginEnvironment *env = cls;
2324   struct Plugin *plugin;
2325   struct GNUNET_TRANSPORT_PluginFunctions *api;
2326   struct GNUNET_TIME_Relative gn_timeout;
2327   long long unsigned int port;
2328
2329   GNUNET_assert(cls !=NULL);
2330 #if DEBUG_HTTP
2331   GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,"Starting http plugin...\n");
2332 #endif
2333
2334   plugin = GNUNET_malloc (sizeof (struct Plugin));
2335   plugin->stats = env->stats;
2336   plugin->env = env;
2337   plugin->peers = NULL;
2338   plugin->bind4_address = NULL;
2339   plugin->use_ipv6  = GNUNET_YES;
2340   plugin->use_ipv4  = GNUNET_YES;
2341
2342   api = GNUNET_malloc (sizeof (struct GNUNET_TRANSPORT_PluginFunctions));
2343   api->cls = plugin;
2344   api->send = &http_plugin_send;
2345   api->disconnect = &http_plugin_disconnect;
2346   api->address_pretty_printer = &http_plugin_address_pretty_printer;
2347   api->check_address = &http_plugin_address_suggested;
2348   api->address_to_string = &http_plugin_address_to_string;
2349
2350   /* Hashing our identity to use it in URLs */
2351   GNUNET_CRYPTO_hash_to_enc ( &(plugin->env->my_identity->hashPubKey), &plugin->my_ascii_hash_ident);
2352
2353   /* Reading port number from config file */
2354   if (GNUNET_CONFIGURATION_have_value (env->cfg,
2355                                                                    "transport-http", "USE_IPv6"))
2356     {
2357           plugin->use_ipv6 = GNUNET_CONFIGURATION_get_value_yesno (env->cfg,
2358                                                                                                            "transport-http",
2359                                                                                                            "USE_IPv6");
2360     }
2361   /* Reading port number from config file */
2362   if (GNUNET_CONFIGURATION_have_value (env->cfg,
2363                                                                    "transport-http", "USE_IPv4"))
2364     {
2365           plugin->use_ipv4 = GNUNET_CONFIGURATION_get_value_yesno (env->cfg,
2366                                                                                                            "transport-http",
2367                                                                                                            "USE_IPv4");
2368     }
2369   /* Reading port number from config file */
2370   if ((GNUNET_OK !=
2371        GNUNET_CONFIGURATION_get_value_number (env->cfg,
2372                                               "transport-http",
2373                                               "PORT",
2374                                               &port)) ||
2375       (port > 65535) )
2376     {
2377       GNUNET_log_from (GNUNET_ERROR_TYPE_ERROR,
2378                        "http",
2379                        _("Require valid port number for transport plugin `%s' in configuration!\n"),
2380                        "transport-http");
2381       libgnunet_plugin_transport_http_done (api);
2382       return NULL;
2383     }
2384
2385   /* Reading ipv4 addresse to bind to from config file */
2386   if ((plugin->use_ipv4==GNUNET_YES) && (GNUNET_CONFIGURATION_have_value (env->cfg,
2387                                                                    "transport-http", "BINDTO4")))
2388   {
2389           GNUNET_break (GNUNET_OK ==
2390                                         GNUNET_CONFIGURATION_get_value_string (env->cfg,
2391                                                                                                                    "transport-http",
2392                                                                                                                    "BINDTO4",
2393                                                                                                                    &plugin->bind_hostname));
2394           plugin->bind4_address = GNUNET_malloc(sizeof(struct sockaddr_in));
2395           plugin->bind4_address->sin_family = AF_INET;
2396           plugin->bind4_address->sin_port = htons (port);
2397
2398           if (inet_pton(AF_INET,plugin->bind_hostname, &plugin->bind4_address->sin_addr)<=0)
2399           {
2400                   GNUNET_log_from (GNUNET_ERROR_TYPE_ERROR,
2401                                                    "http",
2402                                                    _("Misconfigured address to bind to in configuration!\n"),
2403                                                    "transport-http");
2404                   GNUNET_free(plugin->bind4_address);
2405                   GNUNET_free(plugin->bind_hostname);
2406                   plugin->bind_hostname = NULL;
2407                   plugin->bind4_address = NULL;
2408           }
2409   }
2410
2411   /* Reading ipv4 addresse to bind to from config file */
2412   if ((plugin->use_ipv6==GNUNET_YES) && (GNUNET_CONFIGURATION_have_value (env->cfg,
2413                                                                    "transport-http", "BINDTO6")))
2414   {
2415           if (GNUNET_OK == GNUNET_CONFIGURATION_get_value_string (env->cfg,
2416                                                                                                                    "transport-http",
2417                                                                                                                    "BINDTO6",
2418                                                                                                                    &plugin->bind_hostname))
2419           {
2420                   plugin->bind6_address = GNUNET_malloc(sizeof(struct sockaddr_in6));
2421                   plugin->bind6_address->sin6_family = AF_INET6;
2422                   plugin->bind6_address->sin6_port = htons (port);
2423
2424                   if (inet_pton(AF_INET6,plugin->bind_hostname, &plugin->bind6_address->sin6_addr)<=0)
2425                   {
2426                           GNUNET_log_from (GNUNET_ERROR_TYPE_ERROR,
2427                                                            "http",
2428                                                            _("Misconfigured address to bind to in configuration!\n"),
2429                                                            "transport-http");
2430                           GNUNET_free(plugin->bind6_address);
2431                           GNUNET_free(plugin->bind_hostname);
2432                           plugin->bind_hostname = NULL;
2433                           plugin->bind6_address = NULL;
2434                   }
2435           }
2436   }
2437
2438   GNUNET_assert ((port > 0) && (port <= 65535));
2439   plugin->port_inbound = port;
2440   gn_timeout = GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT;
2441   unsigned int timeout = (gn_timeout.value) / 1000;
2442   if ((plugin->http_server_daemon_v6 == NULL) && (plugin->use_ipv6 == GNUNET_YES) && (port != 0))
2443   {
2444         struct sockaddr * tmp = (struct sockaddr *) plugin->bind6_address;
2445     plugin->http_server_daemon_v6 = MHD_start_daemon (
2446 #if DEBUG_CONNECTIONS
2447                                                                    MHD_USE_DEBUG |
2448 #endif
2449                                                                    MHD_USE_IPv6,
2450                                        port,
2451                                        &mhd_accept_cb,
2452                                        plugin , &mdh_access_cb, plugin,
2453                                        MHD_OPTION_SOCK_ADDR, tmp,
2454                                        MHD_OPTION_CONNECTION_LIMIT, (unsigned int) 32,
2455                                        //MHD_OPTION_PER_IP_CONNECTION_LIMIT, (unsigned int) 6,
2456                                        MHD_OPTION_CONNECTION_TIMEOUT, (unsigned int) timeout,
2457                                        MHD_OPTION_CONNECTION_MEMORY_LIMIT, (size_t) (16 * 1024),
2458                                        MHD_OPTION_NOTIFY_COMPLETED, &mhd_termination_cb, NULL,
2459                                        MHD_OPTION_END);
2460   }
2461   if ((plugin->http_server_daemon_v4 == NULL) && (plugin->use_ipv4 == GNUNET_YES) && (port != 0))
2462   {
2463   plugin->http_server_daemon_v4 = MHD_start_daemon (
2464 #if DEBUG_CONNECTIONS
2465                                                                    MHD_USE_DEBUG |
2466 #endif
2467                                                                    MHD_NO_FLAG,
2468                                        port,
2469                                        &mhd_accept_cb,
2470                                        plugin , &mdh_access_cb, plugin,
2471                                        MHD_OPTION_SOCK_ADDR, (struct sockaddr_in *)plugin->bind4_address,
2472                                        MHD_OPTION_CONNECTION_LIMIT, (unsigned int) 32,
2473                                        //MHD_OPTION_PER_IP_CONNECTION_LIMIT, (unsigned int) 6,
2474                                        MHD_OPTION_CONNECTION_TIMEOUT, (unsigned int) timeout,
2475                                        MHD_OPTION_CONNECTION_MEMORY_LIMIT, (size_t) (16 * 1024),
2476                                        MHD_OPTION_NOTIFY_COMPLETED, &mhd_termination_cb, NULL,
2477                                        MHD_OPTION_END);
2478   }
2479   if (plugin->http_server_daemon_v4 != NULL)
2480     plugin->http_server_task_v4 = http_server_daemon_prepare (plugin, plugin->http_server_daemon_v4);
2481   if (plugin->http_server_daemon_v6 != NULL)
2482     plugin->http_server_task_v6 = http_server_daemon_prepare (plugin, plugin->http_server_daemon_v6);
2483
2484
2485   if (plugin->http_server_task_v4 != GNUNET_SCHEDULER_NO_TASK)
2486   {
2487 #if DEBUG_HTTP
2488           GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,"Starting MHD with IPv4 bound to %s with port %u\n",(plugin->bind_hostname!=NULL) ? plugin->bind_hostname : "every address",port);
2489 #endif
2490   }
2491   else if ((plugin->http_server_task_v6 != GNUNET_SCHEDULER_NO_TASK) && (plugin->http_server_task_v4 != GNUNET_SCHEDULER_NO_TASK))
2492   {
2493 #if DEBUG_HTTP
2494     GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,"Starting MHD with IPv6 bound to %s with port %u\n",(plugin->bind_hostname!=NULL) ? plugin->bind_hostname : "every address", port);
2495 #endif
2496   }
2497   else if ((plugin->http_server_task_v6 != GNUNET_SCHEDULER_NO_TASK) && (plugin->http_server_task_v4 == GNUNET_SCHEDULER_NO_TASK))
2498   {
2499 #if DEBUG_HTTP
2500     GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,"Starting MHD with IPv4 and IPv6 bound to %s with port %u\n",(plugin->bind_hostname!=NULL) ? plugin->bind_hostname : "every address", port);
2501 #endif
2502   }
2503   else
2504   {
2505         char * tmp = NULL;
2506         if ((plugin->use_ipv6 == GNUNET_YES) && (plugin->use_ipv4 == GNUNET_YES))
2507                 GNUNET_asprintf(&tmp,"with IPv4 and IPv6 enabled");
2508         if ((plugin->use_ipv6 == GNUNET_NO) && (plugin->use_ipv4 == GNUNET_YES))
2509                 GNUNET_asprintf(&tmp,"with IPv4 enabled");
2510         if ((plugin->use_ipv6 == GNUNET_YES) && (plugin->use_ipv4 == GNUNET_NO))
2511                 GNUNET_asprintf(&tmp,"with IPv6 enabled");
2512         if ((plugin->use_ipv6 == GNUNET_NO) && (plugin->use_ipv4 == GNUNET_NO))
2513                 GNUNET_asprintf(&tmp,"with NO IP PROTOCOL enabled");
2514         GNUNET_log (GNUNET_ERROR_TYPE_ERROR,"HTTP Server with %s could not be started on port %u! https plugin failed!\n",tmp, port);
2515         GNUNET_free(tmp);
2516     libgnunet_plugin_transport_http_done (api);
2517     return NULL;
2518   }
2519
2520   /* Initializing cURL */
2521   curl_global_init(CURL_GLOBAL_ALL);
2522   plugin->multi_handle = curl_multi_init();
2523
2524   if ( NULL == plugin->multi_handle )
2525   {
2526     GNUNET_log_from (GNUNET_ERROR_TYPE_ERROR,
2527                                    "https",
2528                                    _("Could not initialize curl multi handle, failed to start http plugin!\n"),
2529                                    "transport-https");
2530     libgnunet_plugin_transport_http_done (api);
2531     return NULL;
2532   }
2533
2534   plugin->peers = GNUNET_CONTAINER_multihashmap_create (10);
2535   GNUNET_OS_network_interfaces_list (&process_interfaces, plugin);
2536
2537   return api;
2538 }
2539
2540 /* end of plugin_transport_http.c */