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 #if BUILD_HTTPS
  44 #define LIBGNUNET_PLUGIN_TRANSPORT_INIT libgnunet_plugin_transport_https_init
  45 #define LIBGNUNET_PLUGIN_TRANSPORT_DONE libgnunet_plugin_transport_https_done
  46 #define LIBGNUNET_PLUGIN_TRANSPORT_COMPONENT transport_https
  47 #define PROTOCOL_PREFIX "https"
  48 #else
  49 #define LIBGNUNET_PLUGIN_TRANSPORT_INIT libgnunet_plugin_transport_http_init
  50 #define LIBGNUNET_PLUGIN_TRANSPORT_DONE libgnunet_plugin_transport_http_done
  51 #define LIBGNUNET_PLUGIN_TRANSPORT_COMPONENT transport_http
  52 #define PROTOCOL_PREFIX "http"
  53 #endif
  54
  55 #define DEBUG_HTTP GNUNET_NO
  56 #define DEBUG_CURL GNUNET_NO
  57 #define DEBUG_MHD GNUNET_NO
  58 #define DEBUG_CONNECTIONS GNUNET_NO
  59 #define DEBUG_SESSION_SELECTION GNUNET_NO
  60 #define DEBUG_SCHEDULING GNUNET_NO
  61 #define CURL_TCP_NODELAY GNUNET_YES
  62
  63 #define INBOUND GNUNET_NO
  64 #define OUTBOUND GNUNET_YES
  65
  66
  67
  68 /**
  69  * Text of the response sent back after the last bytes of a PUT
  70  * request have been received (just to formally obey the HTTP
  71  * protocol).
  72  */
  73 #define HTTP_PUT_RESPONSE "Thank you!"
  74
  75 /**
  76  * After how long do we expire an address that we
  77  * learned from another peer if it is not reconfirmed
  78  * by anyone?
  79  */
  80 #define LEARNED_ADDRESS_EXPIRATION GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_HOURS, 6)
  81
  82 /**
  83  * Page returned if request invalid
  84  */
  85 #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>"
  86
  87 /**
  88  * Timeout for a http connect
  89  */
  90 #define HTTP_CONNECT_TIMEOUT 30
  91
  92
  93 /**
  94  * Network format for IPv4 addresses.
  95  */
  96 struct IPv4HttpAddress
  97 {
  98   /**
  99    * IPv4 address, in network byte order.
 100    */
 101   uint32_t ipv4_addr GNUNET_PACKED;
 102
 103   /**
 104    * Port number, in network byte order.
 105    */
 106   uint16_t u_port GNUNET_PACKED;
 107
 108 };
 109
 110
 111 /**
 112  * Network format for IPv6 addresses.
 113  */
 114 struct IPv6HttpAddress
 115 {
 116   /**
 117    * IPv6 address.
 118    */
 119   struct in6_addr ipv6_addr GNUNET_PACKED;
 120
 121   /**
 122    * Port number, in network byte order.
 123    */
 124   uint16_t u6_port GNUNET_PACKED;
 125
 126 };
 127
 128
 129 /**
 130  *  Message to send using http
 131  */
 132 struct HTTP_Message
 133 {
 134   /**
 135    * next pointer for double linked list
 136    */
 137   struct HTTP_Message * next;
 138
 139   /**
 140    * previous pointer for double linked list
 141    */
 142   struct HTTP_Message * prev;
 143
 144   /**
 145    * buffer containing data to send
 146    */
 147   char *buf;
 148
 149   /**
 150    * amount of data already sent
 151    */
 152   size_t pos;
 153
 154   /**
 155    * buffer length
 156    */
 157   size_t size;
 158
 159   /**
 160    * Continuation function to call once the transmission buffer
 161    * has again space available.  NULL if there is no
 162    * continuation to call.
 163    */
 164   GNUNET_TRANSPORT_TransmitContinuation transmit_cont;
 165
 166   /**
 167    * Closure for transmit_cont.
 168    */
 169   void *transmit_cont_cls;
 170 };
 171
 172
 173 struct HTTP_PeerContext
 174 {
 175   /**
 176    * peer's identity
 177    */
 178   struct GNUNET_PeerIdentity identity;
 179
 180   /**
 181    * Pointer to the global plugin struct.
 182    */
 183   struct Plugin *plugin;
 184
 185   /**
 186    * Linked list of connections with this peer
 187    * head
 188    */
 189   struct Session * head;
 190
 191   /**
 192    * Linked list of connections with this peer
 193    * tail
 194    */
 195   struct Session * tail;
 196
 197   /**
 198    * id for next session
 199    */
 200   size_t session_id_counter;
 201
 202   /**
 203    * Last session used to send data
 204    */
 205   struct Session * last_session;
 206 };
 207
 208
 209 struct Session
 210 {
 211   /**
 212    * API requirement.
 213    */
 214   struct SessionHeader header;
 215
 216   /**
 217    * next session in linked list
 218    */
 219   struct Session * next;
 220
 221   /**
 222    * previous session in linked list
 223    */
 224   struct Session * prev;
 225
 226   /**
 227    * address of this session
 228    */
 229   void * addr;
 230
 231   /**
 232    * address length
 233    */
 234   size_t addrlen;
 235
 236   /**
 237    * target url
 238    */
 239   char * url;
 240
 241   /**
 242    * Message queue for outbound messages
 243    * head of queue
 244    */
 245   struct HTTP_Message * pending_msgs_head;
 246
 247   /**
 248    * Message queue for outbound messages
 249    * tail of queue
 250    */
 251   struct HTTP_Message * pending_msgs_tail;
 252
 253   /**
 254    * partner peer this connection belongs to
 255    */
 256   struct HTTP_PeerContext * peercontext;
 257
 258   /**
 259    * message stream tokenizer for incoming data
 260    */
 261   struct GNUNET_SERVER_MessageStreamTokenizer *msgtok;
 262
 263   /**
 264    * session direction
 265    * outbound: OUTBOUND (GNUNET_YES)
 266    * inbound : INBOUND (GNUNET_NO)
 267    */
 268   unsigned int direction;
 269
 270   /**
 271    * is session connected to send data?
 272    */
 273   unsigned int send_connected;
 274
 275   /**
 276    * is send connection active?
 277    */
 278   unsigned int send_active;
 279
 280   /**
 281    * connection disconnect forced (e.g. from transport)
 282    */
 283   unsigned int send_force_disconnect;
 284
 285   /**
 286    * is session connected to receive data?
 287    */
 288   unsigned int recv_connected;
 289
 290   /**
 291    * is receive connection active?
 292    */
 293   unsigned int recv_active;
 294
 295   /**
 296    * connection disconnect forced (e.g. from transport)
 297    */
 298   unsigned int recv_force_disconnect;
 299
 300   /**
 301    * id for next session
 302    * NOTE: 0 is not an ID, zero is not defined. A correct ID is always > 0
 303    */
 304   size_t session_id;
 305
 306   /**
 307    * entity managing sending data
 308    * outbound session: CURL *
 309    * inbound session: mhd_connection *
 310    */
 311   void * send_endpoint;
 312
 313   /**
 314    * entity managing recieving data
 315    * outbound session: CURL *
 316    * inbound session: mhd_connection *
 317    */
 318   void * recv_endpoint;
 319 };
 320
 321 /**
 322  * Encapsulation of all of the state of the plugin.
 323  */
 324 struct Plugin
 325 {
 326   /**
 327    * Our environment.
 328    */
 329   struct GNUNET_TRANSPORT_PluginEnvironment *env;
 330
 331   /**
 332    * Handle for reporting statistics.
 333    */
 334   struct GNUNET_STATISTICS_Handle *stats;
 335
 336   /**
 337    * Plugin Port
 338    */
 339   unsigned int port_inbound;
 340
 341   struct GNUNET_CONTAINER_MultiHashMap *peers;
 342
 343   /**
 344    * Daemon for listening for new IPv4 connections.
 345    */
 346   struct MHD_Daemon *http_server_daemon_v4;
 347
 348   /**
 349    * Daemon for listening for new IPv6connections.
 350    */
 351   struct MHD_Daemon *http_server_daemon_v6;
 352
 353   /**
 354    * Our primary task for http daemon handling IPv4 connections
 355    */
 356   GNUNET_SCHEDULER_TaskIdentifier http_server_task_v4;
 357
 358   /**
 359    * Our primary task for http daemon handling IPv6 connections
 360    */
 361   GNUNET_SCHEDULER_TaskIdentifier http_server_task_v6;
 362
 363   /**
 364    * The task sending data
 365    */
 366   GNUNET_SCHEDULER_TaskIdentifier http_curl_task;
 367
 368   /**
 369    * cURL Multihandle
 370    */
 371   CURLM * multi_handle;
 372
 373   /**
 374    * Our ASCII encoded, hashed peer identity
 375    * This string is used to distinguish between connections and is added to the urls
 376    */
 377   struct GNUNET_CRYPTO_HashAsciiEncoded my_ascii_hash_ident;
 378
 379   /**
 380    * IPv4 Address the plugin binds to
 381    */
 382   struct sockaddr_in * bind4_address;
 383
 384   /**
 385    * IPv6 Address the plugins binds to
 386    */
 387   struct sockaddr_in6 * bind6_address;
 388
 389   /**
 390    * Hostname to bind to
 391    */
 392   char * bind_hostname;
 393
 394   /**
 395    * Is IPv4 enabled?
 396    */
 397   int use_ipv6;
 398
 399   /**
 400    * Is IPv6 enabled?
 401    */
 402   int use_ipv4;
 403
 404   /**
 405    * Closure passed by MHD to the mhd_logger function
 406    */
 407   void * mhd_log;
 408
 409   /* only needed for HTTPS plugin */
 410 #if BUILD_HTTPS
 411   /* The certificate MHD uses as an \0 terminated string */
 412   char * cert;
 413
 414   /* The private key MHD uses as an \0 terminated string */
 415   char * key;
 416
 417   /* crypto init string */
 418   char * crypto_init;
 419 #endif
 420 };
 421
 422
 423 /**
 424  * Function called for a quick conversion of the binary address to
 425  * a numeric address.  Note that the caller must not free the
 426  * address and that the next call to this function is allowed
 427  * to override the address again.
 428  *
 429  * @param cls closure
 430  * @param addr binary address
 431  * @param addrlen length of the address
 432  * @return string representing the same address
 433  */
 434 static const char*
 435 http_plugin_address_to_string (void *cls,
 436                                    const void *addr,
 437                                    size_t addrlen);
 438
 439
 440 /**
 441  * Call MHD to process pending ipv4 requests and then go back
 442  * and schedule the next run.
 443  */
 444 static void http_server_daemon_v4_run (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc);
 445 /**
 446  * Call MHD to process pending ipv6 requests and then go back
 447  * and schedule the next run.
 448  */
 449 static void http_server_daemon_v6_run (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc);
 450
 451 /**
 452  * Function setting up curl handle and selecting message to send
 453  * @param plugin plugin
 454  * @param ses session to send data to
 455  * @param con connection
 456  * @return bytes sent to peer
 457  */
 458 static int send_check_connections (struct Plugin *plugin, struct Session *ps);
 459
 460 /**
 461  * Function setting up file descriptors and scheduling task to run
 462  * @param cls closure
 463  * @param ses session to send data to
 464  * @param
 465  */
 466 static int curl_schedule (struct Plugin *plugin);
 467
 468
 469 /**
 470  * Creates a valid url from passed address and id
 471  * @param plugin plugin
 472  * @param addr address to create url from
 473  * @param addrlen address lenth
 474  * @param id session id
 475  * @return the created url
 476  */
 477 static char * create_url(struct Plugin *plugin, const void * addr, size_t addrlen, size_t id)
 478 {
 479   char *url = NULL;
 480   char *addr_str = (char *) http_plugin_address_to_string(NULL, addr, addrlen);
 481
 482   GNUNET_assert ((addr!=NULL) && (addrlen != 0));
 483   GNUNET_asprintf(&url,
 484                   "%s://%s/%s;%u", PROTOCOL_PREFIX, addr_str,
 485                   (char *) (&plugin->my_ascii_hash_ident),id);
 486   GNUNET_free_non_null(addr_str);
 487   return url;
 488 }
 489
 490 /**
 491  * Removes a message from the linked list of messages
 492  * @param ps session
 493  * @param msg message
 494  * @return GNUNET_SYSERR if msg not found, GNUNET_OK on success
 495  */
 496 static int remove_http_message (struct Session * ps, struct HTTP_Message * msg)
 497 {
 498   GNUNET_CONTAINER_DLL_remove(ps->pending_msgs_head,ps->pending_msgs_tail,msg);
 499   GNUNET_free(msg);
 500   return GNUNET_OK;
 501 }
 502
 503 /**
 504  * Iterator to remove peer context
 505  * @param cls the plugin
 506  * @key the peers public key hashcode
 507  * @value the peer context
 508  * @return GNUNET_YES on success
 509  */
 510 int remove_peer_context_Iterator (void *cls, const GNUNET_HashCode *key, void *value)
 511 {
 512   struct Plugin *plugin = cls;
 513   struct HTTP_PeerContext * pc = value;
 514   struct Session * ps = pc->head;
 515   struct Session * tmp = NULL;
 516   struct HTTP_Message * msg = NULL;
 517   struct HTTP_Message * msg_tmp = NULL;
 518 #if DEBUG_HTTP
 519   GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,"Freeing context for peer `%s'\n",GNUNET_i2s(&pc->identity));
 520 #endif
 521   GNUNET_CONTAINER_multihashmap_remove (plugin->peers, &pc->identity.hashPubKey, pc);
 522   while (ps!=NULL)
 523   {
 524         plugin->env->session_end(plugin, &pc->identity, ps);
 525         tmp = ps->next;
 526
 527     GNUNET_free_non_null (ps->addr);
 528     GNUNET_free(ps->url);
 529     if (ps->msgtok != NULL)
 530       GNUNET_SERVER_mst_destroy (ps->msgtok);
 531
 532     msg = ps->pending_msgs_head;
 533     while (msg!=NULL)
 534     {
 535       msg_tmp = msg->next;
 536       GNUNET_free(msg);
 537       msg = msg_tmp;
 538     }
 539     if (ps->direction==OUTBOUND)
 540     {
 541       if (ps->send_endpoint!=NULL)
 542         curl_easy_cleanup(ps->send_endpoint);
 543       if (ps->recv_endpoint!=NULL)
 544         curl_easy_cleanup(ps->recv_endpoint);
 545     }
 546
 547     GNUNET_free(ps);
 548     ps=tmp;
 549   }
 550   GNUNET_free(pc);
 551   GNUNET_STATISTICS_update (plugin->env->stats,
 552                             gettext_noop ("# HTTP peers active"),
 553                             -1,
 554                             GNUNET_NO);
 555   return GNUNET_YES;
 556 }
 557
 558
 559 /**
 560  * Removes a session from the linked list of sessions
 561  * @param pc peer context
 562  * @param ps session
 563  * @param call_msg_cont GNUNET_YES to call pending message continuations, otherwise no
 564  * @param call_msg_cont_result result to call message continuations with
 565  * @return GNUNET_SYSERR if msg not found, GNUNET_OK on success
 566  */
 567 static int remove_session (struct HTTP_PeerContext * pc, struct Session * ps,  int call_msg_cont, int call_msg_cont_result)
 568 {
 569   struct HTTP_Message * msg;
 570   struct Plugin * plugin = ps->peercontext->plugin;
 571
 572 #if DEBUG_CONNECTIONS
 573   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);
 574 #endif
 575   plugin->env->session_end(plugin, &pc->identity, ps);
 576
 577   GNUNET_free_non_null (ps->addr);
 578   GNUNET_SERVER_mst_destroy (ps->msgtok);
 579   GNUNET_free(ps->url);
 580
 581   if (ps->direction==INBOUND)
 582   {
 583           if (ps->recv_endpoint != NULL)
 584           {
 585                   curl_easy_cleanup(ps->recv_endpoint);
 586                   ps->recv_endpoint = NULL;
 587           }
 588           if (ps->send_endpoint != NULL)
 589           {
 590                   curl_easy_cleanup(ps->send_endpoint);
 591                   ps->send_endpoint = NULL;
 592           }
 593   }
 594
 595   msg = ps->pending_msgs_head;
 596   while (msg!=NULL)
 597   {
 598     if ((call_msg_cont == GNUNET_YES) && (msg->transmit_cont!=NULL))
 599     {
 600       msg->transmit_cont (msg->transmit_cont_cls,&pc->identity,call_msg_cont_result);
 601     }
 602     GNUNET_CONTAINER_DLL_remove(ps->pending_msgs_head,ps->pending_msgs_head,msg);
 603     GNUNET_free(msg);
 604     msg = ps->pending_msgs_head;
 605   }
 606
 607   GNUNET_CONTAINER_DLL_remove(pc->head,pc->tail,ps);
 608   GNUNET_free(ps);
 609   ps = NULL;
 610
 611   /* no sessions left remove peer */
 612   if (pc->head==NULL)
 613   {
 614 #if DEBUG_HTTP
 615   GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,"No sessions left for peer `%s', removing context\n",GNUNET_i2s(&pc->identity));
 616 #endif
 617         remove_peer_context_Iterator(plugin, &pc->identity.hashPubKey, pc);
 618   }
 619
 620   return GNUNET_OK;
 621 }
 622
 623
 624 /**
 625  * Add the IP of our network interface to the list of
 626  * our external IP addresses.
 627  *
 628  * @param cls the 'struct Plugin*'
 629  * @param name name of the interface
 630  * @param isDefault do we think this may be our default interface
 631  * @param addr address of the interface
 632  * @param addrlen number of bytes in addr
 633  * @return GNUNET_OK to continue iterating
 634  */
 635 static int
 636 process_interfaces (void *cls,
 637                     const char *name,
 638                     int isDefault,
 639                     const struct sockaddr *addr, socklen_t addrlen)
 640 {
 641   struct Plugin *plugin = cls;
 642   struct IPv4HttpAddress * t4;
 643   struct IPv6HttpAddress * t6;
 644   int af;
 645
 646
 647   GNUNET_assert(cls !=NULL);
 648   af = addr->sa_family;
 649   if ((af == AF_INET) && (plugin->use_ipv4 == GNUNET_YES) && (plugin->bind6_address == NULL))
 650     {
 651           struct in_addr bnd_cmp = ((struct sockaddr_in *) addr)->sin_addr;
 652       t4 = GNUNET_malloc(sizeof(struct IPv4HttpAddress));
 653       /* Not skipping loopback addresses
 654       if (INADDR_LOOPBACK == ntohl(((struct sockaddr_in *) addr)->sin_addr.s_addr))
 655       {
 656
 657         return GNUNET_OK;
 658       }
 659       */
 660       t4->ipv4_addr = ((struct sockaddr_in *) addr)->sin_addr.s_addr;
 661       t4->u_port = htons (plugin->port_inbound);
 662       if (plugin->bind4_address != NULL)
 663       {
 664           if (0 == memcmp(&plugin->bind4_address->sin_addr, &bnd_cmp, sizeof (struct in_addr)))
 665           {
 666                   plugin->env->notify_address(plugin->env->cls,PROTOCOL_PREFIX,t4, sizeof (struct IPv4HttpAddress), GNUNET_TIME_UNIT_FOREVER_REL);
 667           }
 668       }
 669       else
 670       {
 671           plugin->env->notify_address(plugin->env->cls,PROTOCOL_PREFIX,t4, sizeof (struct IPv4HttpAddress), GNUNET_TIME_UNIT_FOREVER_REL);
 672       }
 673       GNUNET_free (t4);
 674     }
 675   else if ((af == AF_INET6) && (plugin->use_ipv6 == GNUNET_YES)  && (plugin->bind4_address == NULL))
 676     {
 677           struct in6_addr bnd_cmp6 = ((struct sockaddr_in6 *) addr)->sin6_addr;
 678       if (IN6_IS_ADDR_LINKLOCAL (&((struct sockaddr_in6 *) addr)->sin6_addr))
 679         {
 680           return GNUNET_OK;
 681         }
 682       t6 = GNUNET_malloc(sizeof(struct IPv6HttpAddress));
 683       GNUNET_assert(t6 != NULL);
 684       if (plugin->bind6_address != NULL)
 685       {
 686           if (0 == memcmp(&plugin->bind6_address->sin6_addr, &bnd_cmp6, sizeof (struct in6_addr)))
 687           {
 688               memcpy (&t6->ipv6_addr,
 689                       &((struct sockaddr_in6 *) addr)->sin6_addr,
 690                       sizeof (struct in6_addr));
 691               t6->u6_port = htons (plugin->port_inbound);
 692               plugin->env->notify_address(plugin->env->cls,PROTOCOL_PREFIX,t6,sizeof (struct IPv6HttpAddress) , GNUNET_TIME_UNIT_FOREVER_REL);
 693           }
 694       }
 695       else
 696       {
 697           memcpy (&t6->ipv6_addr,
 698                   &((struct sockaddr_in6 *) addr)->sin6_addr,
 699                   sizeof (struct in6_addr));
 700           t6->u6_port = htons (plugin->port_inbound);
 701           plugin->env->notify_address(plugin->env->cls,PROTOCOL_PREFIX,t6,sizeof (struct IPv6HttpAddress) , GNUNET_TIME_UNIT_FOREVER_REL);
 702       }
 703       GNUNET_free (t6);
 704     }
 705   return GNUNET_OK;
 706 }
 707
 708
 709 /**
 710  * External logging function for MHD
 711  * @param arg arguments
 712  * @param fmt format string
 713  * @param ap  list of arguments
 714  */
 715 void mhd_logger (void * arg, const char * fmt, va_list ap)
 716 {
 717         char text[1024];
 718         vsnprintf(text, 1024, fmt, ap);
 719         va_end(ap);
 720         GNUNET_log (GNUNET_ERROR_TYPE_ERROR,"MHD: %s \n", text);
 721 }
 722
 723
 724 static void mhd_termination_cb (void *cls, struct MHD_Connection * connection, void **httpSessionCache)
 725 {
 726   struct Session * ps = *httpSessionCache;
 727   if (ps == NULL)
 728     return;
 729   struct HTTP_PeerContext * pc = ps->peercontext;
 730
 731   if (connection==ps->recv_endpoint)
 732   {
 733 #if DEBUG_CONNECTIONS
 734     GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,"Connection %X: inbound connection from peer `%s' was terminated\n", ps, GNUNET_i2s(&pc->identity));
 735 #endif
 736     ps->recv_active = GNUNET_NO;
 737     ps->recv_connected = GNUNET_NO;
 738     ps->recv_endpoint = NULL;
 739   }
 740   if (connection==ps->send_endpoint)
 741   {
 742
 743     ps->send_active = GNUNET_NO;
 744     ps->send_connected = GNUNET_NO;
 745     ps->send_endpoint = NULL;
 746 #if DEBUG_CONNECTIONS
 747     GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,"Connection %X: outbound connection from peer `%s' was terminated\n", ps, GNUNET_i2s(&pc->identity));
 748 #endif
 749   }
 750
 751   /* if both connections disconnected, remove session */
 752   if ((ps->send_connected == GNUNET_NO) && (ps->recv_connected == GNUNET_NO))
 753   {
 754       GNUNET_STATISTICS_update (pc->plugin->env->stats,
 755                             gettext_noop ("# HTTP inbound sessions for peers active"),
 756                             -1,
 757                             GNUNET_NO);
 758     remove_session(pc,ps,GNUNET_YES,GNUNET_SYSERR);
 759   }
 760 }
 761
 762 /**
 763  * Callback called by MessageStreamTokenizer when a message has arrived
 764  * @param cls current session as closure
 765  * @param client clien
 766  * @param message the message to be forwarded to transport service
 767  */
 768
 769 static void mhd_write_mst_cb (void *cls,
 770                               void *client,
 771                               const struct GNUNET_MessageHeader *message)
 772 {
 773
 774   struct Session *ps  = cls;
 775   GNUNET_assert(ps != NULL);
 776
 777   struct HTTP_PeerContext *pc = ps->peercontext;
 778   GNUNET_assert(pc != NULL);
 779 #if DEBUG_HTTP
 780   GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
 781               "Connection %X: Forwarding message to transport service, type %u and size %u from `%s' (`%s')\n",
 782               ps,
 783               ntohs(message->type),
 784               ntohs(message->size),
 785               GNUNET_i2s(&(ps->peercontext)->identity),http_plugin_address_to_string(NULL,ps->addr,ps->addrlen));
 786 #endif
 787   pc->plugin->env->receive (ps->peercontext->plugin->env->cls,
 788                             &pc->identity,
 789                             message, 1, ps,
 790                             NULL,
 791                             0);
 792 }
 793
 794 /**
 795  * Check if incoming connection is accepted.
 796  * NOTE: Here every connection is accepted
 797  * @param cls plugin as closure
 798  * @param addr address of incoming connection
 799  * @param addr_len address length of incoming connection
 800  * @return MHD_YES if connection is accepted, MHD_NO if connection is rejected
 801  *
 802  */
 803 static int
 804 mhd_accept_cb (void *cls, const struct sockaddr *addr, socklen_t addr_len)
 805 {
 806 #if 0
 807   struct Plugin *plugin = cls;
 808 #endif
 809   /* Every connection is accepted, nothing more to do here */
 810   return MHD_YES;
 811 }
 812
 813
 814 /**
 815  * Callback called by MHD when it needs data to send
 816  * @param cls current session
 817  * @param pos position in buffer
 818  * @param buf the buffer to write data to
 819  * @param max max number of bytes available in buffer
 820  * @return bytes written to buffer
 821  */
 822 static ssize_t
 823 mhd_send_callback (void *cls, uint64_t pos, char *buf, size_t max)
 824 {
 825   struct Session * ps = cls;
 826   struct HTTP_PeerContext * pc;
 827   struct HTTP_Message * msg;
 828   int bytes_read = 0;
 829
 830   GNUNET_assert (ps!=NULL);
 831
 832   pc = ps->peercontext;
 833   msg = ps->pending_msgs_tail;
 834   if (ps->send_force_disconnect==GNUNET_YES)
 835   {
 836 #if DEBUG_CONNECTIONS
 837     GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,"Connection %X: outbound forced to disconnect\n",ps);
 838 #endif
 839     return -1;
 840   }
 841
 842   if (msg!=NULL)
 843   {
 844     if ((msg->size-msg->pos) <= max)
 845     {
 846       memcpy(buf,&msg->buf[msg->pos],(msg->size-msg->pos));
 847       bytes_read = msg->size-msg->pos;
 848       msg->pos+=(msg->size-msg->pos);
 849     }
 850     else
 851     {
 852       memcpy(buf,&msg->buf[msg->pos],max);
 853       msg->pos+=max;
 854       bytes_read = max;
 855     }
 856
 857     if (msg->pos==msg->size)
 858     {
 859       if (NULL!=msg->transmit_cont)
 860         msg->transmit_cont (msg->transmit_cont_cls,&pc->identity,GNUNET_OK);
 861       remove_http_message(ps,msg);
 862     }
 863   }
 864   return bytes_read;
 865 }
 866
 867 /**
 868  * Process GET or PUT request received via MHD.  For
 869  * GET, queue response that will send back our pending
 870  * messages.  For PUT, process incoming data and send
 871  * to GNUnet core.  In either case, check if a session
 872  * already exists and create a new one if not.
 873  */
 874 static int
 875 mdh_access_cb (void *cls,
 876                            struct MHD_Connection *mhd_connection,
 877                            const char *url,
 878                            const char *method,
 879                            const char *version,
 880                            const char *upload_data,
 881                            size_t * upload_data_size, void **httpSessionCache)
 882 {
 883   struct Plugin *plugin = cls;
 884   struct MHD_Response *response;
 885   const union MHD_ConnectionInfo * conn_info;
 886
 887   struct sockaddr_in  *addrin;
 888   struct sockaddr_in6 *addrin6;
 889
 890   char address[INET6_ADDRSTRLEN+14];
 891   struct GNUNET_PeerIdentity pi_in;
 892   size_t id_num = 0;
 893
 894   struct IPv4HttpAddress ipv4addr;
 895   struct IPv6HttpAddress ipv6addr;
 896
 897   struct HTTP_PeerContext *pc;
 898   struct Session *ps = NULL;
 899   struct Session *ps_tmp = NULL;
 900
 901   int res = GNUNET_NO;
 902   int send_error_to_client;
 903   void * addr = NULL;
 904   size_t addr_len = 0 ;
 905
 906   GNUNET_assert(cls !=NULL);
 907   send_error_to_client = GNUNET_NO;
 908
 909   if (NULL == *httpSessionCache)
 910   {
 911     /* check url for peer identity , if invalid send HTTP 404*/
 912     size_t len = strlen(&url[1]);
 913     char * peer = GNUNET_malloc(104+1);
 914
 915     if ((len>104) && (url[104]==';'))
 916     {
 917         char * id = GNUNET_malloc((len-104)+1);
 918         strcpy(id,&url[105]);
 919         memcpy(peer,&url[1],103);
 920         peer[103] = '\0';
 921         id_num = strtoul ( id, NULL , 10);
 922         GNUNET_free(id);
 923     }
 924     res = GNUNET_CRYPTO_hash_from_string (peer, &(pi_in.hashPubKey));
 925     GNUNET_free(peer);
 926     if ( GNUNET_SYSERR == res )
 927     {
 928       response = MHD_create_response_from_data (strlen (HTTP_ERROR_RESPONSE),HTTP_ERROR_RESPONSE, MHD_NO, MHD_NO);
 929       res = MHD_queue_response (mhd_connection, MHD_HTTP_NOT_FOUND, response);
 930       MHD_destroy_response (response);
 931 #if DEBUG_CONNECTIONS
 932       if (res == MHD_YES)
 933         GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,"Peer has no valid ident, sent HTTP 1.1/404\n");
 934       else
 935         GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,"Peer has no valid ident, could not send error\n");
 936 #endif
 937       return res;
 938     }
 939   }
 940   else
 941   {
 942     ps = *httpSessionCache;
 943     pc = ps->peercontext;
 944   }
 945
 946   if (NULL == *httpSessionCache)
 947   {
 948     /* get peer context */
 949     pc = GNUNET_CONTAINER_multihashmap_get (plugin->peers, &pi_in.hashPubKey);
 950     /* Peer unknown */
 951     if (pc==NULL)
 952     {
 953       pc = GNUNET_malloc(sizeof (struct HTTP_PeerContext));
 954       pc->plugin = plugin;
 955       pc->session_id_counter=1;
 956       pc->last_session = NULL;
 957       memcpy(&pc->identity, &pi_in, sizeof(struct GNUNET_PeerIdentity));
 958       GNUNET_CONTAINER_multihashmap_put(plugin->peers, &pc->identity.hashPubKey, pc, GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY);
 959       GNUNET_STATISTICS_update (plugin->env->stats,
 960                             gettext_noop ("# HTTP peers active"),
 961                             1,
 962                             GNUNET_NO);
 963     }
 964
 965     conn_info = MHD_get_connection_info(mhd_connection, MHD_CONNECTION_INFO_CLIENT_ADDRESS );
 966     /* Incoming IPv4 connection */
 967     if ( AF_INET == conn_info->client_addr->sin_family)
 968     {
 969       addrin = conn_info->client_addr;
 970       inet_ntop(addrin->sin_family, &(addrin->sin_addr),address,INET_ADDRSTRLEN);
 971       memcpy(&ipv4addr.ipv4_addr,&(addrin->sin_addr),sizeof(struct in_addr));
 972       ipv4addr.u_port = addrin->sin_port;
 973       addr = &ipv4addr;
 974       addr_len = sizeof(struct IPv4HttpAddress);
 975     }
 976     /* Incoming IPv6 connection */
 977     if ( AF_INET6 == conn_info->client_addr->sin_family)
 978     {
 979       addrin6 = (struct sockaddr_in6 *) conn_info->client_addr;
 980       inet_ntop(addrin6->sin6_family, &(addrin6->sin6_addr),address,INET6_ADDRSTRLEN);
 981       memcpy(&ipv6addr.ipv6_addr,&(addrin6->sin6_addr),sizeof(struct in6_addr));
 982       ipv6addr.u6_port = addrin6->sin6_port;
 983       addr = &ipv6addr;
 984       addr_len = sizeof(struct IPv6HttpAddress);
 985     }
 986
 987     GNUNET_assert (addr != NULL);
 988     GNUNET_assert (addr_len != 0);
 989
 990     ps = NULL;
 991     /* only inbound sessions here */
 992
 993     ps_tmp = pc->head;
 994     while (ps_tmp!=NULL)
 995     {
 996       if ((ps_tmp->direction==INBOUND) && (ps_tmp->session_id == id_num) && (id_num!=0))
 997       {
 998         if ((ps_tmp->recv_force_disconnect!=GNUNET_YES) && (ps_tmp->send_force_disconnect!=GNUNET_YES))
 999         ps=ps_tmp;
1000         break;
1001       }
1002       ps_tmp=ps_tmp->next;
1003     }
1004
1005     if (ps==NULL)
1006     {
1007       ps = GNUNET_malloc(sizeof (struct Session));
1008       ps->addr = GNUNET_malloc(addr_len);
1009       memcpy(ps->addr,addr,addr_len);
1010       ps->addrlen = addr_len;
1011       ps->direction=INBOUND;
1012       ps->pending_msgs_head = NULL;
1013       ps->pending_msgs_tail = NULL;
1014       ps->send_connected=GNUNET_NO;
1015       ps->send_active=GNUNET_NO;
1016       ps->recv_connected=GNUNET_NO;
1017       ps->recv_active=GNUNET_NO;
1018       ps->peercontext=pc;
1019       ps->session_id =id_num;
1020       ps->url = create_url (plugin, ps->addr, ps->addrlen, ps->session_id);
1021       GNUNET_CONTAINER_DLL_insert(pc->head,pc->tail,ps);
1022       GNUNET_STATISTICS_update (plugin->env->stats,
1023                             gettext_noop ("# HTTP inbound sessions for peers active"),
1024                             1,
1025                             GNUNET_NO);
1026     }
1027
1028     *httpSessionCache = ps;
1029     if (ps->msgtok==NULL)
1030       ps->msgtok = GNUNET_SERVER_mst_create (&mhd_write_mst_cb, ps);
1031 #if DEBUG_HTTP
1032     GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,"Connection %X: HTTP Daemon has new an incoming `%s' request from peer `%s' (`%s')\n",
1033                 ps,
1034                 method,
1035                 GNUNET_i2s(&pc->identity),
1036                 http_plugin_address_to_string(NULL, ps->addr, ps->addrlen));
1037 #endif
1038   }
1039
1040   /* Is it a PUT or a GET request */
1041   if (0 == strcmp (MHD_HTTP_METHOD_PUT, method))
1042   {
1043     if (ps->recv_force_disconnect == GNUNET_YES)
1044     {
1045 #if DEBUG_CONNECTIONS
1046       GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,"Connection %X: inbound connection was forced to disconnect\n",ps);
1047 #endif
1048       ps->recv_active = GNUNET_NO;
1049       return MHD_NO;
1050     }
1051     if ((*upload_data_size == 0) && (ps->recv_active==GNUNET_NO))
1052     {
1053       ps->recv_endpoint = mhd_connection;
1054       ps->recv_connected = GNUNET_YES;
1055       ps->recv_active = GNUNET_YES;
1056       ps->recv_force_disconnect = GNUNET_NO;
1057 #if DEBUG_CONNECTIONS
1058       GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,"Connection %X: inbound PUT connection connected\n",ps);
1059 #endif
1060       return MHD_YES;
1061     }
1062
1063     /* Transmission of all data complete */
1064     if ((*upload_data_size == 0) && (ps->recv_active == GNUNET_YES))
1065     {
1066       response = MHD_create_response_from_data (strlen (HTTP_PUT_RESPONSE),HTTP_PUT_RESPONSE, MHD_NO, MHD_NO);
1067       res = MHD_queue_response (mhd_connection, MHD_HTTP_OK, response);
1068 #if DEBUG_CONNECTIONS
1069       GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,"Connection %X: Sent HTTP/1.1: 200 OK as PUT Response\n",ps);
1070 #endif
1071       MHD_destroy_response (response);
1072       ps->recv_active=GNUNET_NO;
1073       return MHD_YES;
1074     }
1075
1076     /* Recieving data */
1077     if ((*upload_data_size > 0) && (ps->recv_active == GNUNET_YES))
1078     {
1079       res = GNUNET_SERVER_mst_receive(ps->msgtok, ps, upload_data,*upload_data_size, GNUNET_NO, GNUNET_NO);
1080       (*upload_data_size) = 0;
1081       return MHD_YES;
1082     }
1083     else
1084       return MHD_NO;
1085   }
1086   if ( 0 == strcmp (MHD_HTTP_METHOD_GET, method) )
1087   {
1088     if (ps->send_force_disconnect == GNUNET_YES)
1089     {
1090 #if DEBUG_CONNECTIONS
1091       GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,"Connection %X: outbound connection was  forced to disconnect\n",ps);
1092 #endif
1093       ps->send_active = GNUNET_NO;
1094       return MHD_NO;
1095     }
1096           ps->send_connected = GNUNET_YES;
1097           ps->send_active = GNUNET_YES;
1098           ps->send_endpoint = mhd_connection;
1099           ps->send_force_disconnect = GNUNET_NO;
1100 #if DEBUG_CONNECTIONS
1101           GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,"Connection %X: inbound GET connection connected\n",ps);
1102 #endif
1103           response = MHD_create_response_from_callback(-1,32 * 1024, &mhd_send_callback, ps, NULL);
1104           res = MHD_queue_response (mhd_connection, MHD_HTTP_OK, response);
1105           MHD_destroy_response (response);
1106           return MHD_YES;
1107   }
1108   return MHD_NO;
1109 }
1110
1111 /**
1112  * Function that queries MHD's select sets and
1113  * starts the task waiting for them.
1114  * @param plugin plugin
1115  * @param daemon_handle the MHD daemon handle
1116  * @return gnunet task identifier
1117  */
1118 static GNUNET_SCHEDULER_TaskIdentifier
1119 http_server_daemon_prepare (struct Plugin *plugin , struct MHD_Daemon *daemon_handle)
1120 {
1121   GNUNET_SCHEDULER_TaskIdentifier ret;
1122   fd_set rs;
1123   fd_set ws;
1124   fd_set es;
1125   struct GNUNET_NETWORK_FDSet *wrs;
1126   struct GNUNET_NETWORK_FDSet *wws;
1127   struct GNUNET_NETWORK_FDSet *wes;
1128   int max;
1129   unsigned long long timeout;
1130   int haveto;
1131   struct GNUNET_TIME_Relative tv;
1132
1133   ret = GNUNET_SCHEDULER_NO_TASK;
1134   FD_ZERO(&rs);
1135   FD_ZERO(&ws);
1136   FD_ZERO(&es);
1137   wrs = GNUNET_NETWORK_fdset_create ();
1138   wes = GNUNET_NETWORK_fdset_create ();
1139   wws = GNUNET_NETWORK_fdset_create ();
1140   max = -1;
1141   GNUNET_assert (MHD_YES ==
1142                  MHD_get_fdset (daemon_handle,
1143                                 &rs,
1144                                 &ws,
1145                                 &es,
1146                                 &max));
1147   haveto = MHD_get_timeout (daemon_handle, &timeout);
1148   if (haveto == MHD_YES)
1149     tv.value = (uint64_t) timeout;
1150   else
1151     tv = GNUNET_TIME_UNIT_SECONDS;
1152   GNUNET_NETWORK_fdset_copy_native (wrs, &rs, max);
1153   GNUNET_NETWORK_fdset_copy_native (wws, &ws, max);
1154   GNUNET_NETWORK_fdset_copy_native (wes, &es, max);
1155   if (daemon_handle == plugin->http_server_daemon_v4)
1156   {
1157         if (plugin->http_server_task_v4 != GNUNET_SCHEDULER_NO_TASK)
1158         {
1159                 GNUNET_SCHEDULER_cancel(plugin->env->sched, plugin->http_server_task_v4);
1160                 plugin->http_server_daemon_v4 = GNUNET_SCHEDULER_NO_TASK;
1161         }
1162
1163     ret = GNUNET_SCHEDULER_add_select (plugin->env->sched,
1164                                        GNUNET_SCHEDULER_PRIORITY_DEFAULT,
1165                                        GNUNET_SCHEDULER_NO_TASK,
1166                                        tv,
1167                                        wrs,
1168                                        wws,
1169                                        &http_server_daemon_v4_run,
1170                                        plugin);
1171   }
1172   if (daemon_handle == plugin->http_server_daemon_v6)
1173   {
1174         if (plugin->http_server_task_v6 != GNUNET_SCHEDULER_NO_TASK)
1175         {
1176                 GNUNET_SCHEDULER_cancel(plugin->env->sched, plugin->http_server_task_v6);
1177                 plugin->http_server_task_v6 = GNUNET_SCHEDULER_NO_TASK;
1178         }
1179
1180     ret = GNUNET_SCHEDULER_add_select (plugin->env->sched,
1181                                        GNUNET_SCHEDULER_PRIORITY_DEFAULT,
1182                                        GNUNET_SCHEDULER_NO_TASK,
1183                                        tv,
1184                                        wrs,
1185                                        wws,
1186                                        &http_server_daemon_v6_run,
1187                                        plugin);
1188   }
1189   GNUNET_NETWORK_fdset_destroy (wrs);
1190   GNUNET_NETWORK_fdset_destroy (wws);
1191   GNUNET_NETWORK_fdset_destroy (wes);
1192   return ret;
1193 }
1194
1195 /**
1196  * Call MHD IPv4 to process pending requests and then go back
1197  * and schedule the next run.
1198  * @param cls plugin as closure
1199  * @param tc task context
1200  */
1201 static void http_server_daemon_v4_run (void *cls,
1202                              const struct GNUNET_SCHEDULER_TaskContext *tc)
1203 {
1204   struct Plugin *plugin = cls;
1205
1206 #if DEBUG_SCHEDULING
1207   if (0 != (tc->reason & GNUNET_SCHEDULER_REASON_READ_READY))
1208     GNUNET_log (GNUNET_ERROR_TYPE_ERROR,"http_server_daemon_v4_run: GNUNET_SCHEDULER_REASON_READ_READY\n");
1209   if (0 != (tc->reason & GNUNET_SCHEDULER_REASON_WRITE_READY))
1210       GNUNET_log (GNUNET_ERROR_TYPE_ERROR,"http_server_daemon_v4_run: GNUNET_SCHEDULER_REASON_WRITE_READY\n");
1211   if (0 != (tc->reason & GNUNET_SCHEDULER_REASON_TIMEOUT))
1212       GNUNET_log (GNUNET_ERROR_TYPE_ERROR,"http_server_daemon_v4_run: GNUNET_SCHEDULER_REASON_TIMEOUT\n");
1213   if (0 != (tc->reason & GNUNET_SCHEDULER_REASON_STARTUP))
1214       GNUNET_log (GNUNET_ERROR_TYPE_ERROR,"http_server_daemon_v4_run: GGNUNET_SCHEDULER_REASON_STARTUP\n");
1215   if (0 != (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN))
1216       GNUNET_log (GNUNET_ERROR_TYPE_ERROR,"http_server_daemon_v4_run: GGNUNET_SCHEDULER_REASON_SHUTDOWN\n");
1217 #endif
1218
1219   GNUNET_assert(cls !=NULL);
1220   plugin->http_server_task_v4 = GNUNET_SCHEDULER_NO_TASK;
1221
1222   if (0 != (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN))
1223     return;
1224
1225   GNUNET_assert (MHD_YES == MHD_run (plugin->http_server_daemon_v4));
1226   plugin->http_server_task_v4 = http_server_daemon_prepare (plugin, plugin->http_server_daemon_v4);
1227  }
1228
1229
1230 /**
1231  * Call MHD IPv6 to process pending requests and then go back
1232  * and schedule the next run.
1233  * @param cls plugin as closure
1234  * @param tc task context
1235  */
1236 static void http_server_daemon_v6_run (void *cls,
1237                              const struct GNUNET_SCHEDULER_TaskContext *tc)
1238 {
1239   struct Plugin *plugin = cls;
1240
1241 #if DEBUG_SCHEDULING
1242   if (0 != (tc->reason & GNUNET_SCHEDULER_REASON_READ_READY))
1243       GNUNET_log (GNUNET_ERROR_TYPE_ERROR,"http_server_daemon_v6_run: GNUNET_SCHEDULER_REASON_READ_READY\n");
1244   if (0 != (tc->reason & GNUNET_SCHEDULER_REASON_WRITE_READY))
1245       GNUNET_log (GNUNET_ERROR_TYPE_ERROR,"http_server_daemon_v6_run: GNUNET_SCHEDULER_REASON_WRITE_READY\n");
1246   if (0 != (tc->reason & GNUNET_SCHEDULER_REASON_TIMEOUT))
1247       GNUNET_log (GNUNET_ERROR_TYPE_ERROR,"http_server_daemon_v6_run: GNUNET_SCHEDULER_REASON_TIMEOUT\n");
1248   if (0 != (tc->reason & GNUNET_SCHEDULER_REASON_STARTUP))
1249      GNUNET_log (GNUNET_ERROR_TYPE_ERROR,"http_server_daemon_v6_run: GGNUNET_SCHEDULER_REASON_STARTUP\n");
1250   if (0 != (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN))
1251      GNUNET_log (GNUNET_ERROR_TYPE_ERROR,"http_server_daemon_v6_run: GGNUNET_SCHEDULER_REASON_SHUTDOWN\n");
1252 #endif
1253
1254   GNUNET_assert(cls !=NULL);
1255   plugin->http_server_task_v6 = GNUNET_SCHEDULER_NO_TASK;
1256
1257   if (0 != (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN))
1258     return;
1259
1260   GNUNET_assert (MHD_YES == MHD_run (plugin->http_server_daemon_v6));
1261   plugin->http_server_task_v6 = http_server_daemon_prepare (plugin, plugin->http_server_daemon_v6);
1262 }
1263
1264 static size_t curl_get_header_cb( void *ptr, size_t size, size_t nmemb, void *stream)
1265 {
1266   struct Session * ps = stream;
1267
1268   long http_result = 0;
1269   int res;
1270   /* Getting last http result code */
1271   GNUNET_assert(NULL!=ps);
1272   if (ps->recv_connected==GNUNET_NO)
1273   {
1274     res = curl_easy_getinfo(ps->recv_endpoint, CURLINFO_RESPONSE_CODE, &http_result);
1275     if (CURLE_OK == res)
1276     {
1277       if (http_result == 200)
1278       {
1279         ps->recv_connected = GNUNET_YES;
1280         ps->recv_active = GNUNET_YES;
1281 #if DEBUG_CONNECTIONS
1282         GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,"Connection %X: connected to recieve data\n",ps);
1283 #endif
1284         // Calling send_check_connections again since receive is established
1285         send_check_connections (ps->peercontext->plugin, ps);
1286       }
1287     }
1288   }
1289
1290 #if DEBUG_CURL
1291   char * tmp;
1292   size_t len = size * nmemb;
1293   tmp = NULL;
1294   if ((size * nmemb) < SIZE_MAX)
1295     tmp = GNUNET_malloc (len+1);
1296
1297   if ((tmp != NULL) && (len > 0))
1298   {
1299     memcpy(tmp,ptr,len);
1300     if (len>=2)
1301     {
1302       if (tmp[len-2] == 13)
1303         tmp[len-2]= '\0';
1304     }
1305     GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,"Connection %X: Header: %s\n",ps,tmp);
1306   }
1307   GNUNET_free_non_null (tmp);
1308 #endif
1309
1310   return size * nmemb;
1311 }
1312
1313 /**
1314  * Callback called by libcurl when new headers arrive
1315  * Used to get HTTP result for curl operations
1316  * @param ptr stream to read from
1317  * @param size size of one char element
1318  * @param nmemb number of char elements
1319  * @param stream closure set by user
1320  * @return bytes read by function
1321  */
1322
1323 static size_t curl_put_header_cb( void *ptr, size_t size, size_t nmemb, void *stream)
1324 {
1325   struct Session * ps = stream;
1326
1327   char * tmp;
1328   size_t len = size * nmemb;
1329   long http_result = 0;
1330   int res;
1331
1332   /* Getting last http result code */
1333   GNUNET_assert(NULL!=ps);
1334   res = curl_easy_getinfo(ps->send_endpoint, CURLINFO_RESPONSE_CODE, &http_result);
1335   if (CURLE_OK == res)
1336   {
1337     if ((http_result == 100) && (ps->send_connected==GNUNET_NO))
1338     {
1339       ps->send_connected = GNUNET_YES;
1340       ps->send_active = GNUNET_YES;
1341 #if DEBUG_CONNECTIONS
1342       GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,"Connection %X: connected to send data\n",ps);
1343 #endif
1344     }
1345     if ((http_result == 200) && (ps->send_connected==GNUNET_YES))
1346     {
1347       ps->send_connected = GNUNET_NO;
1348       ps->send_active = GNUNET_NO;
1349 #if DEBUG_CONNECTIONS
1350       GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,"Connection %X: sending disconnected\n",ps);
1351 #endif
1352     }
1353   }
1354
1355   tmp = NULL;
1356   if ((size * nmemb) < SIZE_MAX)
1357     tmp = GNUNET_malloc (len+1);
1358
1359   if ((tmp != NULL) && (len > 0))
1360   {
1361     memcpy(tmp,ptr,len);
1362     if (len>=2)
1363     {
1364       if (tmp[len-2] == 13)
1365         tmp[len-2]= '\0';
1366     }
1367   }
1368
1369   GNUNET_free_non_null (tmp);
1370
1371   return size * nmemb;
1372 }
1373
1374 /**
1375  * Callback method used with libcurl
1376  * Method is called when libcurl needs to read data during sending
1377  * @param stream pointer where to write data
1378  * @param size size of an individual element
1379  * @param nmemb count of elements that can be written to the buffer
1380  * @param ptr source pointer, passed to the libcurl handle
1381  * @return bytes written to stream
1382  */
1383 static size_t curl_send_cb(void *stream, size_t size, size_t nmemb, void *ptr)
1384 {
1385   struct Session * ps = ptr;
1386   struct HTTP_Message * msg = ps->pending_msgs_tail;
1387   size_t bytes_sent;
1388   size_t len;
1389
1390   if (ps->send_active == GNUNET_NO)
1391   {
1392         return CURL_READFUNC_PAUSE;
1393   }
1394
1395   if ((ps->pending_msgs_tail == NULL) && (ps->send_active == GNUNET_YES))
1396   {
1397 #if DEBUG_CONNECTIONS
1398     GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,"Connection %X: No Message to send, pausing connection\n",ps);
1399 #endif
1400     ps->send_active = GNUNET_NO;
1401     return CURL_READFUNC_PAUSE;
1402   }
1403
1404   GNUNET_assert (msg!=NULL);
1405
1406   /* data to send */
1407   if (msg->pos < msg->size)
1408   {
1409     /* data fit in buffer */
1410     if ((msg->size - msg->pos) <= (size * nmemb))
1411     {
1412       len = (msg->size - msg->pos);
1413       memcpy(stream, &msg->buf[msg->pos], len);
1414       msg->pos += len;
1415       bytes_sent = len;
1416     }
1417     else
1418     {
1419       len = size*nmemb;
1420       memcpy(stream, &msg->buf[msg->pos], len);
1421       msg->pos += len;
1422       bytes_sent = len;
1423     }
1424   }
1425   /* no data to send */
1426   else
1427   {
1428     bytes_sent = 0;
1429   }
1430
1431   if ( msg->pos == msg->size)
1432   {
1433 #if DEBUG_CONNECTIONS
1434           GNUNET_log (GNUNET_ERROR_TYPE_ERROR,"Connection %X: Message with %u bytes sent, removing message from queue \n",ps, msg->pos);
1435 #endif
1436     /* Calling transmit continuation  */
1437     if (NULL != ps->pending_msgs_tail->transmit_cont)
1438       msg->transmit_cont (ps->pending_msgs_tail->transmit_cont_cls,&(ps->peercontext)->identity,GNUNET_OK);
1439     remove_http_message(ps, msg);
1440   }
1441   return bytes_sent;
1442 }
1443
1444 static void curl_receive_mst_cb  (void *cls,
1445                                 void *client,
1446                                 const struct GNUNET_MessageHeader *message)
1447 {
1448   struct Session *ps  = cls;
1449   GNUNET_assert(ps != NULL);
1450
1451   struct HTTP_PeerContext *pc = ps->peercontext;
1452   GNUNET_assert(pc != NULL);
1453 #if DEBUG_HTTP
1454   GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1455               "Connection %X: Forwarding message to transport service, type %u and size %u from `%s' (`%s')\n",
1456               ps,
1457               ntohs(message->type),
1458               ntohs(message->size),
1459               GNUNET_i2s(&(pc->identity)),http_plugin_address_to_string(NULL,ps->addr,ps->addrlen));
1460 #endif
1461   pc->plugin->env->receive (pc->plugin->env->cls,
1462                             &pc->identity,
1463                             message, 1, ps,
1464                             ps->addr,
1465                             ps->addrlen);
1466 }
1467
1468
1469 /**
1470 * Callback method used with libcurl
1471 * Method is called when libcurl needs to write data during sending
1472 * @param stream pointer where to write data
1473 * @param size size of an individual element
1474 * @param nmemb count of elements that can be written to the buffer
1475 * @param ptr destination pointer, passed to the libcurl handle
1476 * @return bytes read from stream
1477 */
1478 static size_t curl_receive_cb( void *stream, size_t size, size_t nmemb, void *ptr)
1479 {
1480   struct Session * ps = ptr;
1481 #if DEBUG_CONNECTIONS
1482   GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,"Connection %X: %u bytes received\n",ps, size*nmemb);
1483 #endif
1484   GNUNET_SERVER_mst_receive(ps->msgtok, ps, stream, size*nmemb, GNUNET_NO, GNUNET_NO);
1485   return (size * nmemb);
1486
1487 }
1488
1489 static void curl_handle_finished (struct Plugin *plugin)
1490 {
1491         struct Session *ps = NULL;
1492         struct HTTP_PeerContext *pc = NULL;
1493         struct CURLMsg *msg;
1494         struct HTTP_Message * cur_msg = NULL;
1495
1496         int msgs_in_queue;
1497         char * tmp;
1498         long http_result;
1499
1500         do
1501           {
1502                 msg = curl_multi_info_read (plugin->multi_handle, &msgs_in_queue);
1503                 if ((msgs_in_queue == 0) || (msg == NULL))
1504                   break;
1505                 /* get session for affected curl handle */
1506                 GNUNET_assert ( msg->easy_handle != NULL );
1507                 curl_easy_getinfo(msg->easy_handle, CURLINFO_PRIVATE, &tmp);
1508                 ps = (struct Session *) tmp;
1509                 GNUNET_assert ( ps != NULL );
1510                 pc = ps->peercontext;
1511                 GNUNET_assert ( pc != NULL );
1512                 switch (msg->msg)
1513                   {
1514
1515                   case CURLMSG_DONE:
1516                         if ( (msg->data.result != CURLE_OK) &&
1517                                  (msg->data.result != CURLE_GOT_NOTHING) )
1518                         {
1519                           /* sending msg failed*/
1520                           if (msg->easy_handle == ps->send_endpoint)
1521                           {
1522         #if DEBUG_CONNECTIONS
1523                                 GNUNET_log(GNUNET_ERROR_TYPE_INFO,
1524                                                    _("Connection %X: HTTP PUT to peer `%s' (`%s') failed: `%s' `%s'\n"),
1525                                                    ps,
1526                                                    GNUNET_i2s(&pc->identity),
1527                                                    http_plugin_address_to_string(NULL, ps->addr, ps->addrlen),
1528                                                    "curl_multi_perform",
1529                                                    curl_easy_strerror (msg->data.result));
1530         #endif
1531                                 ps->send_connected = GNUNET_NO;
1532                                 ps->send_active = GNUNET_NO;
1533                                 curl_multi_remove_handle(plugin->multi_handle,ps->send_endpoint);
1534                                 //curl_easy_cleanup(ps->send_endpoint);
1535                                 //ps->send_endpoint=NULL;
1536                                 cur_msg = ps->pending_msgs_tail;
1537                                 if (( NULL != cur_msg) && ( NULL != cur_msg->transmit_cont))
1538                                   cur_msg->transmit_cont (cur_msg->transmit_cont_cls,&pc->identity,GNUNET_SYSERR);
1539                           }
1540                           /* GET connection failed */
1541                           if (msg->easy_handle == ps->recv_endpoint)
1542                           {
1543         #if DEBUG_CONNECTIONS
1544                                 GNUNET_log(GNUNET_ERROR_TYPE_INFO,
1545                                          _("Connection %X: HTTP GET to peer `%s' (`%s') failed: `%s' `%s'\n"),
1546                                          ps,
1547                                          GNUNET_i2s(&pc->identity),
1548                                          http_plugin_address_to_string(NULL, ps->addr, ps->addrlen),
1549                                          "curl_multi_perform",
1550                                          curl_easy_strerror (msg->data.result));
1551         #endif
1552                                 ps->recv_connected = GNUNET_NO;
1553                                 ps->recv_active = GNUNET_NO;
1554                                 curl_multi_remove_handle(plugin->multi_handle,ps->recv_endpoint);
1555                                 //curl_easy_cleanup(ps->recv_endpoint);
1556                                 //ps->recv_endpoint=NULL;
1557                           }
1558                         }
1559                         else
1560                         {
1561                           if (msg->easy_handle == ps->send_endpoint)
1562                           {
1563                                 GNUNET_assert (CURLE_OK == curl_easy_getinfo(msg->easy_handle, CURLINFO_RESPONSE_CODE, &http_result));
1564         #if DEBUG_CONNECTIONS
1565                                 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1566                                                         "Connection %X: HTTP PUT connection to peer `%s' (`%s') was closed with HTTP code %u\n",
1567                                                          ps,
1568                                                          GNUNET_i2s(&pc->identity),
1569                                                          http_plugin_address_to_string(NULL, ps->addr, ps->addrlen),
1570                                                          http_result);
1571         #endif
1572                                 /* Calling transmit continuation  */
1573                                 cur_msg = ps->pending_msgs_tail;
1574                                 if (( NULL != cur_msg) && (NULL != cur_msg->transmit_cont))
1575                                 {
1576                                   /* HTTP 1xx : Last message before here was informational */
1577                                   if ((http_result >=100) && (http_result < 200))
1578                                         cur_msg->transmit_cont (cur_msg->transmit_cont_cls,&pc->identity,GNUNET_OK);
1579                                   /* HTTP 2xx: successful operations */
1580                                   if ((http_result >=200) && (http_result < 300))
1581                                         cur_msg->transmit_cont (cur_msg->transmit_cont_cls,&pc->identity,GNUNET_OK);
1582                                   /* HTTP 3xx..5xx: error */
1583                                   if ((http_result >=300) && (http_result < 600))
1584                                         cur_msg->transmit_cont (cur_msg->transmit_cont_cls,&pc->identity,GNUNET_SYSERR);
1585                                 }
1586                                 ps->send_connected = GNUNET_NO;
1587                                 ps->send_active = GNUNET_NO;
1588                                 curl_multi_remove_handle(plugin->multi_handle,ps->send_endpoint);
1589                                 //curl_easy_cleanup(ps->send_endpoint);
1590                                 //ps->send_endpoint =NULL;
1591                           }
1592                           if (msg->easy_handle == ps->recv_endpoint)
1593                           {
1594         #if DEBUG_CONNECTIONS
1595                                 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1596                                                         "Connection %X: HTTP GET connection to peer `%s' (`%s') was closed with HTTP code %u\n",
1597                                                          ps,
1598                                                          GNUNET_i2s(&pc->identity),
1599                                                          http_plugin_address_to_string(NULL, ps->addr, ps->addrlen),
1600                                                          http_result);
1601         #endif
1602                                 ps->recv_connected = GNUNET_NO;
1603                                 ps->recv_active = GNUNET_NO;
1604                                 curl_multi_remove_handle(plugin->multi_handle,ps->recv_endpoint);
1605                                 //curl_easy_cleanup(ps->recv_endpoint);
1606                                 //ps->recv_endpoint=NULL;
1607                           }
1608                         }
1609                         if ((ps->recv_connected == GNUNET_NO) && (ps->send_connected == GNUNET_NO))
1610                           remove_session (pc, ps, GNUNET_YES, GNUNET_SYSERR);
1611                         break;
1612                   default:
1613                         break;
1614                   }
1615           }
1616         while ( (msgs_in_queue > 0) );
1617 }
1618
1619
1620 /**
1621  * Task performing curl operations
1622  * @param cls plugin as closure
1623  * @param tc gnunet scheduler task context
1624  */
1625 static void curl_perform (void *cls,
1626              const struct GNUNET_SCHEDULER_TaskContext *tc)
1627 {
1628   struct Plugin *plugin = cls;
1629   static unsigned int handles_last_run;
1630   int running;
1631   CURLMcode mret;
1632
1633   GNUNET_assert(cls !=NULL);
1634
1635   plugin->http_curl_task = GNUNET_SCHEDULER_NO_TASK;
1636   if (0 != (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN))
1637     return;
1638   do
1639     {
1640       running = 0;
1641       mret = curl_multi_perform (plugin->multi_handle, &running);
1642       if ((running < handles_last_run) && (running>0))
1643           curl_handle_finished(plugin);
1644       handles_last_run = running;
1645     }
1646   while (mret == CURLM_CALL_MULTI_PERFORM);
1647   curl_schedule(plugin);
1648 }
1649
1650
1651 /**
1652  * Function setting up file descriptors and scheduling task to run
1653  *
1654  * @param cls plugin as closure
1655  * @return GNUNET_SYSERR for hard failure, GNUNET_OK for ok
1656  */
1657 static int curl_schedule(struct Plugin *plugin)
1658 {
1659   fd_set rs;
1660   fd_set ws;
1661   fd_set es;
1662   int max;
1663   struct GNUNET_NETWORK_FDSet *grs;
1664   struct GNUNET_NETWORK_FDSet *gws;
1665   long to;
1666   CURLMcode mret;
1667
1668   /* Cancel previous scheduled task */
1669   if (plugin->http_curl_task !=  GNUNET_SCHEDULER_NO_TASK)
1670   {
1671           GNUNET_SCHEDULER_cancel(plugin->env->sched, plugin->http_curl_task);
1672           plugin->http_curl_task = GNUNET_SCHEDULER_NO_TASK;
1673   }
1674
1675   max = -1;
1676   FD_ZERO (&rs);
1677   FD_ZERO (&ws);
1678   FD_ZERO (&es);
1679   mret = curl_multi_fdset (plugin->multi_handle, &rs, &ws, &es, &max);
1680   if (mret != CURLM_OK)
1681     {
1682       GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
1683                   _("%s failed at %s:%d: `%s'\n"),
1684                   "curl_multi_fdset", __FILE__, __LINE__,
1685                   curl_multi_strerror (mret));
1686       return GNUNET_SYSERR;
1687     }
1688   mret = curl_multi_timeout (plugin->multi_handle, &to);
1689   if (mret != CURLM_OK)
1690     {
1691       GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
1692                   _("%s failed at %s:%d: `%s'\n"),
1693                   "curl_multi_timeout", __FILE__, __LINE__,
1694                   curl_multi_strerror (mret));
1695       return GNUNET_SYSERR;
1696     }
1697
1698   grs = GNUNET_NETWORK_fdset_create ();
1699   gws = GNUNET_NETWORK_fdset_create ();
1700   GNUNET_NETWORK_fdset_copy_native (grs, &rs, max + 1);
1701   GNUNET_NETWORK_fdset_copy_native (gws, &ws, max + 1);
1702   plugin->http_curl_task = GNUNET_SCHEDULER_add_select (plugin->env->sched,
1703                                    GNUNET_SCHEDULER_PRIORITY_DEFAULT,
1704                                    GNUNET_SCHEDULER_NO_TASK,
1705                                                                     (to == -1) ? GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_SECONDS, 5) : GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_MILLISECONDS, to),
1706                                    grs,
1707                                    gws,
1708                                    &curl_perform,
1709                                    plugin);
1710   GNUNET_NETWORK_fdset_destroy (gws);
1711   GNUNET_NETWORK_fdset_destroy (grs);
1712   return GNUNET_OK;
1713 }
1714
1715 /**
1716  * Function to log curl debug messages with GNUNET_log
1717  * @param curl handle
1718  * @param type curl_infotype
1719  * @param data data
1720  * @param size size
1721  * @param cls  closure
1722  * @return 0
1723  */
1724 int curl_logger (CURL * curl, curl_infotype type , char * data, size_t size , void * cls)
1725 {
1726
1727         if (type == CURLINFO_TEXT)
1728         {
1729                 char text[size+2];
1730                 memcpy(text,data,size);
1731                 if (text[size-1] == '\n')
1732                         text[size] = '\0';
1733                 else
1734                 {
1735                         text[size] = '\n';
1736                         text[size+1] = '\0';
1737                 }
1738                 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,"CURL: Connection %X - %s", cls, text);
1739         }
1740         return 0;
1741 }
1742
1743 /**
1744  * Function setting up curl handle and selecting message to send
1745  *
1746  * @param plugin plugin
1747  * @param ps session
1748  * @return GNUNET_SYSERR on failure, GNUNET_NO if connecting, GNUNET_YES if ok
1749  */
1750 static int send_check_connections (struct Plugin *plugin, struct Session *ps)
1751 {
1752   CURLMcode mret;
1753   struct HTTP_Message * msg;
1754
1755   struct GNUNET_TIME_Relative timeout = GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT;
1756
1757   if (ps->direction == OUTBOUND)
1758   {
1759     /* RECV DIRECTION */
1760     /* Check if session is connected to receive data, otherwise connect to peer */
1761     if (ps->recv_connected == GNUNET_NO)
1762     {
1763         int fresh = GNUNET_NO;
1764         if (ps->recv_endpoint == NULL)
1765         {
1766             fresh = GNUNET_YES;
1767                 ps->recv_endpoint = curl_easy_init();
1768         }
1769 #if DEBUG_CURL
1770         curl_easy_setopt(ps->recv_endpoint, CURLOPT_VERBOSE, 1L);
1771         curl_easy_setopt(ps->recv_endpoint, CURLOPT_DEBUGFUNCTION , &curl_logger);
1772         curl_easy_setopt(ps->recv_endpoint, CURLOPT_DEBUGDATA , ps->recv_endpoint);
1773 #endif
1774 #if BUILD_HTTPS
1775         curl_easy_setopt (ps->recv_endpoint, CURLOPT_SSLVERSION, CURL_SSLVERSION_TLSv1);
1776                 curl_easy_setopt(ps->recv_endpoint, CURLOPT_SSL_VERIFYPEER, 0);
1777                 curl_easy_setopt(ps->recv_endpoint, CURLOPT_SSL_VERIFYHOST, 0);
1778 #endif
1779         curl_easy_setopt(ps->recv_endpoint, CURLOPT_URL, ps->url);
1780         curl_easy_setopt(ps->recv_endpoint, CURLOPT_HEADERFUNCTION, &curl_get_header_cb);
1781         curl_easy_setopt(ps->recv_endpoint, CURLOPT_WRITEHEADER, ps);
1782         curl_easy_setopt(ps->recv_endpoint, CURLOPT_READFUNCTION, curl_send_cb);
1783         curl_easy_setopt(ps->recv_endpoint, CURLOPT_READDATA, ps);
1784         curl_easy_setopt(ps->recv_endpoint, CURLOPT_WRITEFUNCTION, curl_receive_cb);
1785         curl_easy_setopt(ps->recv_endpoint, CURLOPT_WRITEDATA, ps);
1786         curl_easy_setopt(ps->recv_endpoint, CURLOPT_TIMEOUT, (long) timeout.value);
1787         curl_easy_setopt(ps->recv_endpoint, CURLOPT_PRIVATE, ps);
1788         curl_easy_setopt(ps->recv_endpoint, CURLOPT_CONNECTTIMEOUT, HTTP_CONNECT_TIMEOUT);
1789         curl_easy_setopt(ps->recv_endpoint, CURLOPT_BUFFERSIZE, 2*GNUNET_SERVER_MAX_MESSAGE_SIZE);
1790 #if CURL_TCP_NODELAY
1791         curl_easy_setopt(ps->recv_endpoint, CURLOPT_TCP_NODELAY, 1);
1792 #endif
1793
1794         if (fresh==GNUNET_YES)
1795         {
1796                         mret = curl_multi_add_handle(plugin->multi_handle, ps->recv_endpoint);
1797                         if (mret != CURLM_OK)
1798                         {
1799                           GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
1800                                                   _("Connection: %X: %s failed at %s:%d: `%s'\n"),
1801                                                   ps,
1802                                                   "curl_multi_add_handle", __FILE__, __LINE__,
1803                                                   curl_multi_strerror (mret));
1804                           return GNUNET_SYSERR;
1805                         }
1806         }
1807                 if (plugin->http_curl_task !=  GNUNET_SCHEDULER_NO_TASK)
1808                 {
1809                   GNUNET_SCHEDULER_cancel(plugin->env->sched, plugin->http_curl_task);
1810                   plugin->http_curl_task = GNUNET_SCHEDULER_NO_TASK;
1811                 }
1812                 plugin->http_curl_task = GNUNET_SCHEDULER_add_now (plugin->env->sched, &curl_perform, plugin);
1813     }
1814
1815     /* waiting for receive direction */
1816     if (ps->recv_connected==GNUNET_NO)
1817       return GNUNET_NO;
1818
1819     /* SEND DIRECTION */
1820     /* Check if session is connected to send data, otherwise connect to peer */
1821     if ((ps->send_connected == GNUNET_YES) && (ps->send_endpoint!= NULL))
1822     {
1823       if (ps->send_active == GNUNET_YES)
1824       {
1825 #if DEBUG_CONNECTIONS
1826         GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,"Connection %X: outbound active, enqueueing message\n",ps);
1827 #endif
1828         return GNUNET_YES;
1829       }
1830       if (ps->send_active == GNUNET_NO)
1831       {
1832 #if DEBUG_CONNECTIONS
1833         GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,"Connection %X: outbound paused, unpausing existing connection and enqueueing message\n",ps);
1834 #endif
1835         if (CURLE_OK == curl_easy_pause(ps->send_endpoint,CURLPAUSE_CONT))
1836         {
1837                         ps->send_active=GNUNET_YES;
1838                         if (plugin->http_curl_task !=  GNUNET_SCHEDULER_NO_TASK)
1839                         {
1840                           GNUNET_SCHEDULER_cancel(plugin->env->sched, plugin->http_curl_task);
1841                           plugin->http_curl_task = GNUNET_SCHEDULER_NO_TASK;
1842                         }
1843                         plugin->http_curl_task = GNUNET_SCHEDULER_add_now (plugin->env->sched, &curl_perform, plugin);
1844                         return GNUNET_YES;
1845         }
1846         else
1847                 return GNUNET_SYSERR;
1848       }
1849     }
1850     /* not connected, initiate connection */
1851     if (ps->send_connected==GNUNET_NO)
1852     {
1853         int fresh = GNUNET_NO;
1854         if (NULL == ps->send_endpoint)
1855         {
1856                 ps->send_endpoint = curl_easy_init();
1857                 fresh = GNUNET_YES;
1858         }
1859                 GNUNET_assert (ps->send_endpoint != NULL);
1860                 GNUNET_assert (NULL != ps->pending_msgs_tail);
1861 #if DEBUG_CONNECTIONS
1862                 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,"Connection %X: outbound not connected, initiating connection\n",ps);
1863 #endif
1864                 ps->send_active = GNUNET_NO;
1865                 msg = ps->pending_msgs_tail;
1866
1867 #if DEBUG_CURL
1868                 curl_easy_setopt(ps->send_endpoint, CURLOPT_VERBOSE, 1L);
1869         curl_easy_setopt(ps->send_endpoint, CURLOPT_DEBUGFUNCTION , &curl_logger);
1870         curl_easy_setopt(ps->send_endpoint, CURLOPT_DEBUGDATA , ps->send_endpoint);
1871 #endif
1872 #if BUILD_HTTPS
1873         curl_easy_setopt (ps->send_endpoint, CURLOPT_SSLVERSION, CURL_SSLVERSION_TLSv1);
1874                 curl_easy_setopt(ps->send_endpoint, CURLOPT_SSL_VERIFYPEER, 0);
1875                 curl_easy_setopt(ps->send_endpoint, CURLOPT_SSL_VERIFYHOST, 0);
1876 #endif
1877                 curl_easy_setopt(ps->send_endpoint, CURLOPT_URL, ps->url);
1878                 curl_easy_setopt(ps->send_endpoint, CURLOPT_PUT, 1L);
1879                 curl_easy_setopt(ps->send_endpoint, CURLOPT_HEADERFUNCTION, &curl_put_header_cb);
1880                 curl_easy_setopt(ps->send_endpoint, CURLOPT_WRITEHEADER, ps);
1881                 curl_easy_setopt(ps->send_endpoint, CURLOPT_READFUNCTION, curl_send_cb);
1882                 curl_easy_setopt(ps->send_endpoint, CURLOPT_READDATA, ps);
1883                 curl_easy_setopt(ps->send_endpoint, CURLOPT_WRITEFUNCTION, curl_receive_cb);
1884                 curl_easy_setopt(ps->send_endpoint, CURLOPT_READDATA, ps);
1885                 curl_easy_setopt(ps->send_endpoint, CURLOPT_TIMEOUT, (long) timeout.value);
1886                 curl_easy_setopt(ps->send_endpoint, CURLOPT_PRIVATE, ps);
1887                 curl_easy_setopt(ps->send_endpoint, CURLOPT_CONNECTTIMEOUT, HTTP_CONNECT_TIMEOUT);
1888                 curl_easy_setopt(ps->send_endpoint, CURLOPT_BUFFERSIZE, 2 * GNUNET_SERVER_MAX_MESSAGE_SIZE);
1889 #if CURL_TCP_NODELAY
1890                 curl_easy_setopt(ps->send_endpoint, CURLOPT_TCP_NODELAY, 1);
1891 #endif
1892
1893                 if (fresh==GNUNET_YES)
1894                 {
1895                         mret = curl_multi_add_handle(plugin->multi_handle, ps->send_endpoint);
1896                         if (mret != CURLM_OK)
1897                         {
1898                           GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
1899                                                   _("Connection: %X: %s failed at %s:%d: `%s'\n"),
1900                                                   ps,
1901                                                   "curl_multi_add_handle", __FILE__, __LINE__,
1902                                                   curl_multi_strerror (mret));
1903                           return GNUNET_SYSERR;
1904                         }
1905                 }
1906     }
1907         if (plugin->http_curl_task !=  GNUNET_SCHEDULER_NO_TASK)
1908         {
1909           GNUNET_SCHEDULER_cancel(plugin->env->sched, plugin->http_curl_task);
1910           plugin->http_curl_task = GNUNET_SCHEDULER_NO_TASK;
1911         }
1912         plugin->http_curl_task = GNUNET_SCHEDULER_add_now (plugin->env->sched, &curl_perform, plugin);
1913     return GNUNET_YES;
1914   }
1915   if (ps->direction == INBOUND)
1916   {
1917     GNUNET_assert (NULL != ps->pending_msgs_tail);
1918     if ((ps->recv_connected==GNUNET_YES) && (ps->send_connected==GNUNET_YES) &&
1919         (ps->recv_force_disconnect==GNUNET_NO) && (ps->recv_force_disconnect==GNUNET_NO))
1920         return GNUNET_YES;
1921   }
1922   return GNUNET_SYSERR;
1923 }
1924
1925 /**
1926  * select best session to transmit data to peer
1927  *
1928  * @param cls closure
1929  * @param pc peer context of target peer
1930  * @param addr address of target peer
1931  * @param addrlen address length
1932  * @param force_address does transport service enforce address?
1933  * @param session session passed by transport service
1934  * @return selected session
1935  *
1936  */
1937 static struct Session * send_select_session (struct HTTP_PeerContext *pc, const void * addr, size_t addrlen, int force_address, struct Session * session)
1938 {
1939         struct Session * tmp = NULL;
1940         int addr_given = GNUNET_NO;
1941
1942         if ((addr!=NULL) && (addrlen>0))
1943                 addr_given = GNUNET_YES;
1944
1945         if (force_address == GNUNET_YES)
1946         {
1947                 /* check session given as argument */
1948                 if ((session != NULL) && (addr_given == GNUNET_YES))
1949                 {
1950                       if (0 == memcmp(session->addr, addr, addrlen))
1951                       {
1952                         /* connection can not be used, since it is disconnected */
1953                         if ((session->recv_force_disconnect==GNUNET_NO) && (session->send_force_disconnect==GNUNET_NO))
1954                         {
1955 #if DEBUG_SESSION_SELECTION
1956                                   GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,"Session %X selected: Using session passed by transport to send to forced address \n", session);
1957 #endif
1958                                 return session;
1959                         }
1960                       }
1961                 }
1962                 /* check last session used */
1963                 if ((pc->last_session != NULL)&& (addr_given == GNUNET_YES))
1964                 {
1965                       if (0 == memcmp(pc->last_session->addr, addr, addrlen))
1966                       {
1967                         /* connection can not be used, since it is disconnected */
1968                         if ((pc->last_session->recv_force_disconnect==GNUNET_NO) && (pc->last_session->send_force_disconnect==GNUNET_NO))
1969                         {
1970 #if DEBUG_SESSION_SELECTION
1971                                   GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,"Session %X selected: Using last session used to send to forced address \n", pc->last_session);
1972 #endif
1973                                 return pc->last_session;
1974                         }
1975                       }
1976                 }
1977                 /* find session in existing sessions */
1978                 tmp = pc->head;
1979                 while ((tmp!=NULL) && (addr_given == GNUNET_YES))
1980                 {
1981
1982                           if (0 == memcmp(tmp->addr, addr, addrlen))
1983                       {
1984                         /* connection can not be used, since it is disconnected */
1985                         if ((tmp->recv_force_disconnect==GNUNET_NO) && (tmp->send_force_disconnect==GNUNET_NO))
1986                         {
1987 #if DEBUG_SESSION_SELECTION
1988                                   GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,"Session %X selected: Using existing session to send to forced address \n", session);
1989 #endif
1990                                   return session;
1991                         }
1992
1993                       }
1994                           tmp=tmp->next;
1995                 }
1996                 /* no session to use */
1997                 return NULL;
1998         }
1999         if ((force_address == GNUNET_NO) || (force_address == GNUNET_SYSERR))
2000         {
2001                 /* check session given as argument */
2002                 if (session != NULL)
2003                 {
2004                         /* connection can not be used, since it is disconnected */
2005                         if ((session->recv_force_disconnect==GNUNET_NO) && (session->send_force_disconnect==GNUNET_NO))
2006                         {
2007 #if DEBUG_SESSION_SELECTION
2008                                   GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,"Session %X selected: Using session passed by transport to send not-forced address \n", session);
2009 #endif
2010                                   return session;
2011                         }
2012
2013                 }
2014                 /* check last session used */
2015                 if (pc->last_session != NULL)
2016                 {
2017                         /* connection can not be used, since it is disconnected */
2018                         if ((pc->last_session->recv_force_disconnect==GNUNET_NO) && (pc->last_session->send_force_disconnect==GNUNET_NO))
2019                         {
2020 #if DEBUG_SESSION_SELECTION
2021                                   GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,"Session %X selected: Using last session to send to not-forced address \n", pc->last_session);
2022 #endif
2023                                 return pc->last_session;
2024                         }
2025                 }
2026                 /* find session in existing sessions */
2027                 tmp = pc->head;
2028                 while (tmp!=NULL)
2029                 {
2030                         /* connection can not be used, since it is disconnected */
2031                         if ((tmp->recv_force_disconnect==GNUNET_NO) && (tmp->send_force_disconnect==GNUNET_NO))
2032                         {
2033 #if DEBUG_SESSION_SELECTION
2034                                   GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,"Session %X selected: Using existing session to send to not-forced address \n", tmp);
2035 #endif
2036                                 return tmp;
2037                         }
2038                         tmp=tmp->next;
2039                 }
2040                 return NULL;
2041         }
2042         return NULL;
2043 }
2044
2045 /**
2046  * Function that can be used by the transport service to transmit
2047  * a message using the plugin.   Note that in the case of a
2048  * peer disconnecting, the continuation MUST be called
2049  * prior to the disconnect notification itself.  This function
2050  * will be called with this peer's HELLO message to initiate
2051  * a fresh connection to another peer.
2052  *
2053  * @param cls closure
2054  * @param target who should receive this message
2055  * @param msgbuf the message to transmit
2056  * @param msgbuf_size number of bytes in 'msgbuf'
2057  * @param priority how important is the message (most plugins will
2058  *                 ignore message priority and just FIFO)
2059  * @param to how long to wait at most for the transmission (does not
2060  *                require plugins to discard the message after the timeout,
2061  *                just advisory for the desired delay; most plugins will ignore
2062  *                this as well)
2063  * @param session which session must be used (or NULL for "any")
2064  * @param addr the address to use (can be NULL if the plugin
2065  *                is "on its own" (i.e. re-use existing TCP connection))
2066  * @param addrlen length of the address in bytes
2067  * @param force_address GNUNET_YES if the plugin MUST use the given address,
2068  *                GNUNET_NO means the plugin may use any other address and
2069  *                GNUNET_SYSERR means that only reliable existing
2070  *                bi-directional connections should be used (regardless
2071  *                of address)
2072  * @param cont continuation to call once the message has
2073  *        been transmitted (or if the transport is ready
2074  *        for the next transmission call; or if the
2075  *        peer disconnected...); can be NULL
2076  * @param cont_cls closure for cont
2077  * @return number of bytes used (on the physical network, with overheads);
2078  *         -1 on hard errors (i.e. address invalid); 0 is a legal value
2079  *         and does NOT mean that the message was not transmitted (DV)
2080  */
2081 static ssize_t
2082 http_plugin_send (void *cls,
2083                   const struct GNUNET_PeerIdentity *target,
2084                   const char *msgbuf,
2085                   size_t msgbuf_size,
2086                   unsigned int priority,
2087                   struct GNUNET_TIME_Relative to,
2088                   struct Session *session,
2089                   const void *addr,
2090                   size_t addrlen,
2091                   int force_address,
2092                   GNUNET_TRANSPORT_TransmitContinuation cont,
2093                   void *cont_cls)
2094 {
2095   struct Plugin *plugin = cls;
2096   struct HTTP_Message *msg;
2097   struct HTTP_PeerContext * pc;
2098   struct Session * ps = NULL;
2099
2100   GNUNET_assert(cls !=NULL);
2101
2102 #if DEBUG_HTTP
2103   char * force;
2104   if (force_address == GNUNET_YES)
2105           GNUNET_asprintf(&force, "forced addr.");
2106   if (force_address == GNUNET_NO)
2107           GNUNET_asprintf(&force, "any addr.");
2108   if (force_address == GNUNET_SYSERR)
2109           GNUNET_asprintf(&force,"reliable bi-direc. address addr.");
2110
2111   GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,"Transport tells me to send %u bytes to `%s' using %s (%s) and session: %X\n",
2112                                       msgbuf_size,
2113                                       GNUNET_i2s(target),
2114                                       force,
2115                                       http_plugin_address_to_string(NULL, addr, addrlen),
2116                                       session);
2117
2118   GNUNET_free(force);
2119 #endif
2120
2121   pc = GNUNET_CONTAINER_multihashmap_get (plugin->peers, &target->hashPubKey);
2122   /* Peer unknown */
2123   if (pc==NULL)
2124   {
2125     pc = GNUNET_malloc(sizeof (struct HTTP_PeerContext));
2126     pc->plugin = plugin;
2127     pc->session_id_counter=1;
2128     pc->last_session = NULL;
2129     memcpy(&pc->identity, target, sizeof(struct GNUNET_PeerIdentity));
2130     GNUNET_CONTAINER_multihashmap_put(plugin->peers, &pc->identity.hashPubKey, pc, GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY);
2131     GNUNET_STATISTICS_update (plugin->env->stats,
2132                             gettext_noop ("# HTTP peers active"),
2133                             1,
2134                             GNUNET_NO);
2135   }
2136
2137   ps = send_select_session (pc, addr, addrlen, force_address, session);
2138
2139   /* session not existing, but address forced -> creating new session */
2140   if (ps==NULL)
2141   {
2142         if ((addr!=NULL) && (addrlen!=0))
2143         {
2144       ps = GNUNET_malloc(sizeof (struct Session));
2145 #if DEBUG_SESSION_SELECTION
2146       if (force_address == GNUNET_YES)
2147          GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,"No existing connection & forced address: creating new session %X to peer %s\n", ps, GNUNET_i2s(target));
2148       if (force_address != GNUNET_YES)
2149          GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,"No existing connection: creating new session %X to peer %s\n", ps, GNUNET_i2s(target));
2150 #endif
2151       if ((addrlen!=0) && (addr!=NULL))
2152       {
2153          ps->addr = GNUNET_malloc(addrlen);
2154          memcpy(ps->addr,addr,addrlen);
2155          ps->addrlen = addrlen;
2156       }
2157           else
2158           {
2159                 ps->addr = NULL;
2160                 ps->addrlen = 0;
2161           }
2162           ps->direction=OUTBOUND;
2163           ps->recv_connected = GNUNET_NO;
2164           ps->recv_force_disconnect = GNUNET_NO;
2165           ps->send_connected = GNUNET_NO;
2166           ps->send_force_disconnect = GNUNET_NO;
2167           ps->pending_msgs_head = NULL;
2168           ps->pending_msgs_tail = NULL;
2169           ps->peercontext=pc;
2170           ps->session_id = pc->session_id_counter;
2171           pc->session_id_counter++;
2172           ps->url = create_url (plugin, ps->addr, ps->addrlen, ps->session_id);
2173           if (ps->msgtok == NULL)
2174                         ps->msgtok = GNUNET_SERVER_mst_create (&curl_receive_mst_cb, ps);
2175           GNUNET_CONTAINER_DLL_insert(pc->head,pc->tail,ps);
2176           GNUNET_STATISTICS_update (plugin->env->stats,
2177                                                                 gettext_noop ("# HTTP outbound sessions for peers active"),
2178                                                                 1,
2179                                                                 GNUNET_NO);
2180         }
2181         else
2182         {
2183 #if DEBUG_HTTP
2184                 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));
2185 #endif
2186                 return GNUNET_SYSERR;
2187     }
2188   }
2189
2190   /* create msg */
2191   msg = GNUNET_malloc (sizeof (struct HTTP_Message) + msgbuf_size);
2192   msg->next = NULL;
2193   msg->size = msgbuf_size;
2194   msg->pos = 0;
2195   msg->buf = (char *) &msg[1];
2196   msg->transmit_cont = cont;
2197   msg->transmit_cont_cls = cont_cls;
2198   memcpy (msg->buf,msgbuf, msgbuf_size);
2199   GNUNET_CONTAINER_DLL_insert(ps->pending_msgs_head,ps->pending_msgs_tail,msg);
2200
2201   if (send_check_connections (plugin, ps) == GNUNET_SYSERR)
2202           return GNUNET_SYSERR;
2203           if (force_address != GNUNET_YES)
2204                   pc->last_session = ps;
2205
2206           if (pc->last_session==NULL)
2207                   pc->last_session = ps;
2208           return msg->size;
2209 }
2210
2211
2212
2213 /**
2214  * Function that can be used to force the plugin to disconnect
2215  * from the given peer and cancel all previous transmissions
2216  * (and their continuationc).
2217  *
2218  * @param cls closure
2219  * @param target peer from which to disconnect
2220  */
2221 static void
2222 http_plugin_disconnect (void *cls,
2223                             const struct GNUNET_PeerIdentity *target)
2224 {
2225
2226
2227   struct Plugin *plugin = cls;
2228   struct HTTP_PeerContext *pc = NULL;
2229   struct Session *ps = NULL;
2230   //struct Session *tmp = NULL;
2231
2232   pc = GNUNET_CONTAINER_multihashmap_get (plugin->peers, &target->hashPubKey);
2233   if (pc==NULL)
2234     return;
2235   ps = pc->head;
2236
2237   while (ps!=NULL)
2238   {
2239     /* Telling transport that session is getting disconnected */
2240     plugin->env->session_end(plugin, target, ps);
2241     if (ps->direction==OUTBOUND)
2242     {
2243       if (ps->send_endpoint!=NULL)
2244       {
2245         //GNUNET_assert(CURLM_OK == curl_multi_remove_handle(plugin->multi_handle,ps->send_endpoint));
2246         //curl_easy_cleanup(ps->send_endpoint);
2247         //ps->send_endpoint=NULL;
2248         ps->send_force_disconnect = GNUNET_YES;
2249       }
2250       if (ps->recv_endpoint!=NULL)
2251       {
2252        //GNUNET_assert(CURLM_OK == curl_multi_remove_handle(plugin->multi_handle,ps->recv_endpoint));
2253        //curl_easy_cleanup(ps->recv_endpoint);
2254        //ps->recv_endpoint=NULL;
2255        ps->recv_force_disconnect = GNUNET_YES;
2256       }
2257     }
2258
2259     if (ps->direction==INBOUND)
2260     {
2261       ps->recv_force_disconnect = GNUNET_YES;
2262       ps->send_force_disconnect = GNUNET_YES;
2263     }
2264
2265     while (ps->pending_msgs_head!=NULL)
2266     {
2267       remove_http_message(ps, ps->pending_msgs_head);
2268     }
2269     ps->recv_active = GNUNET_NO;
2270     ps->send_active = GNUNET_NO;
2271     ps=ps->next;
2272   }
2273 }
2274
2275
2276 /**
2277  * Convert the transports address to a nice, human-readable
2278  * format.
2279  *
2280  * @param cls closure
2281  * @param type name of the transport that generated the address
2282  * @param addr one of the addresses of the host, NULL for the last address
2283  *        the specific address format depends on the transport
2284  * @param addrlen length of the address
2285  * @param numeric should (IP) addresses be displayed in numeric form?
2286  * @param timeout after how long should we give up?
2287  * @param asc function to call on each string
2288  * @param asc_cls closure for asc
2289  */
2290 static void
2291 http_plugin_address_pretty_printer (void *cls,
2292                                         const char *type,
2293                                         const void *addr,
2294                                         size_t addrlen,
2295                                         int numeric,
2296                                         struct GNUNET_TIME_Relative timeout,
2297                                         GNUNET_TRANSPORT_AddressStringCallback
2298                                         asc, void *asc_cls)
2299 {
2300   const struct IPv4HttpAddress *t4;
2301   const struct IPv6HttpAddress *t6;
2302   struct sockaddr_in a4;
2303   struct sockaddr_in6 a6;
2304   char * address;
2305   char * ret;
2306   unsigned int port;
2307   unsigned int res;
2308
2309   GNUNET_assert(cls !=NULL);
2310   if (addrlen == sizeof (struct IPv6HttpAddress))
2311   {
2312     address = GNUNET_malloc (INET6_ADDRSTRLEN);
2313     t6 = addr;
2314     a6.sin6_addr = t6->ipv6_addr;
2315     inet_ntop(AF_INET6, &(a6.sin6_addr),address,INET6_ADDRSTRLEN);
2316     port = ntohs(t6->u6_port);
2317   }
2318   else if (addrlen == sizeof (struct IPv4HttpAddress))
2319   {
2320     address = GNUNET_malloc (INET_ADDRSTRLEN);
2321     t4 = addr;
2322     a4.sin_addr.s_addr =  t4->ipv4_addr;
2323     inet_ntop(AF_INET, &(a4.sin_addr),address,INET_ADDRSTRLEN);
2324     port = ntohs(t4->u_port);
2325   }
2326   else
2327   {
2328     /* invalid address */
2329     GNUNET_break_op (0);
2330     asc (asc_cls, NULL);
2331     return;
2332   }
2333   res = GNUNET_asprintf(&ret,"%s://%s:%u/", PROTOCOL_PREFIX, address, port);
2334   GNUNET_free (address);
2335   GNUNET_assert(res != 0);
2336   asc (asc_cls, ret);
2337   GNUNET_free_non_null (ret);
2338 }
2339
2340
2341
2342 /**
2343  * Another peer has suggested an address for this
2344  * peer and transport plugin.  Check that this could be a valid
2345  * address.  If so, consider adding it to the list
2346  * of addresses.
2347  *
2348  * @param cls closure
2349  * @param addr pointer to the address
2350  * @param addrlen length of addr
2351  * @return GNUNET_OK if this is a plausible address for this peer
2352  *         and transport
2353  */
2354 static int
2355 http_plugin_address_suggested (void *cls,
2356                                const void *addr, size_t addrlen)
2357 {
2358   struct Plugin *plugin = cls;
2359   struct IPv4HttpAddress *v4;
2360   struct IPv6HttpAddress *v6;
2361   unsigned int port;
2362
2363   GNUNET_assert(cls !=NULL);
2364   if ((addrlen != sizeof (struct IPv4HttpAddress)) &&
2365       (addrlen != sizeof (struct IPv6HttpAddress)))
2366     {
2367       return GNUNET_SYSERR;
2368     }
2369   if (addrlen == sizeof (struct IPv4HttpAddress))
2370     {
2371       v4 = (struct IPv4HttpAddress *) addr;
2372       /* Not skipping loopback
2373       if (INADDR_LOOPBACK == ntohl(v4->ipv4_addr))
2374       {
2375         return GNUNET_SYSERR;
2376       } */
2377       port = ntohs (v4->u_port);
2378       if (port != plugin->port_inbound)
2379       {
2380         return GNUNET_SYSERR;
2381       }
2382     }
2383   if (addrlen == sizeof (struct IPv6HttpAddress))
2384     {
2385       v6 = (struct IPv6HttpAddress *) addr;
2386       if (IN6_IS_ADDR_LINKLOCAL (&v6->ipv6_addr))
2387         {
2388           return GNUNET_SYSERR;
2389         }
2390       port = ntohs (v6->u6_port);
2391       if (port != plugin->port_inbound)
2392       {
2393         return GNUNET_SYSERR;
2394       }
2395     }
2396
2397   return GNUNET_OK;
2398 }
2399
2400
2401 /**
2402  * Function called for a quick conversion of the binary address to
2403  * a numeric address.  Note that the caller must not free the
2404  * address and that the next call to this function is allowed
2405  * to override the address again.
2406  *
2407  * @param cls closure
2408  * @param addr binary address
2409  * @param addrlen length of the address
2410  * @return string representing the same address
2411  */
2412 static const char*
2413 http_plugin_address_to_string (void *cls,
2414                                    const void *addr,
2415                                    size_t addrlen)
2416 {
2417   const struct IPv4HttpAddress *t4;
2418   const struct IPv6HttpAddress *t6;
2419   struct sockaddr_in a4;
2420   struct sockaddr_in6 a6;
2421   char * address;
2422   char * ret;
2423   uint16_t port;
2424   unsigned int res;
2425
2426   if (addrlen == sizeof (struct IPv6HttpAddress))
2427     {
2428       address = GNUNET_malloc (INET6_ADDRSTRLEN);
2429       t6 = addr;
2430       a6.sin6_addr = t6->ipv6_addr;
2431       inet_ntop(AF_INET6, &(a6.sin6_addr),address,INET6_ADDRSTRLEN);
2432       port = ntohs(t6->u6_port);
2433     }
2434   else if (addrlen == sizeof (struct IPv4HttpAddress))
2435     {
2436       address = GNUNET_malloc (INET_ADDRSTRLEN);
2437       t4 = addr;
2438       a4.sin_addr.s_addr =  t4->ipv4_addr;
2439       inet_ntop(AF_INET, &(a4.sin_addr),address,INET_ADDRSTRLEN);
2440       port = ntohs(t4->u_port);
2441     }
2442   else
2443     {
2444       /* invalid address */
2445       return NULL;
2446     }
2447   res = GNUNET_asprintf(&ret,"%s:%u",address,port);
2448   GNUNET_free (address);
2449   GNUNET_assert(res != 0);
2450   return ret;
2451 }
2452
2453
2454 /**
2455  * Exit point from the plugin.
2456  */
2457 void *
2458 LIBGNUNET_PLUGIN_TRANSPORT_DONE (void *cls)
2459 {
2460   struct GNUNET_TRANSPORT_PluginFunctions *api = cls;
2461   struct Plugin *plugin = api->cls;
2462   CURLMcode mret;
2463   GNUNET_assert(cls !=NULL);
2464
2465   if (plugin->http_server_daemon_v4 != NULL)
2466   {
2467     MHD_stop_daemon (plugin->http_server_daemon_v4);
2468     plugin->http_server_daemon_v4 = NULL;
2469   }
2470   if (plugin->http_server_daemon_v6 != NULL)
2471   {
2472     MHD_stop_daemon (plugin->http_server_daemon_v6);
2473     plugin->http_server_daemon_v6 = NULL;
2474   }
2475
2476   if ( plugin->http_server_task_v4 != GNUNET_SCHEDULER_NO_TASK)
2477   {
2478     GNUNET_SCHEDULER_cancel(plugin->env->sched, plugin->http_server_task_v4);
2479     plugin->http_server_task_v4 = GNUNET_SCHEDULER_NO_TASK;
2480   }
2481
2482   if ( plugin->http_server_task_v6 != GNUNET_SCHEDULER_NO_TASK)
2483   {
2484     GNUNET_SCHEDULER_cancel(plugin->env->sched, plugin->http_server_task_v6);
2485     plugin->http_server_task_v6 = GNUNET_SCHEDULER_NO_TASK;
2486   }
2487
2488   /* free all peer information */
2489   if (plugin->peers!=NULL)
2490   {
2491           GNUNET_CONTAINER_multihashmap_iterate (plugin->peers,
2492                                                                                          &remove_peer_context_Iterator,
2493                                                                                          plugin);
2494           GNUNET_CONTAINER_multihashmap_destroy (plugin->peers);
2495   }
2496   if (plugin->multi_handle!=NULL)
2497   {
2498           mret = curl_multi_cleanup(plugin->multi_handle);
2499 #if DEBUG_HTTP
2500           if ( CURLM_OK != mret)
2501                 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,"curl multihandle clean up failed\n");
2502 #endif
2503           plugin->multi_handle = NULL;
2504   }
2505   curl_global_cleanup();
2506
2507   if ( plugin->http_curl_task != GNUNET_SCHEDULER_NO_TASK)
2508   {
2509     GNUNET_SCHEDULER_cancel(plugin->env->sched, plugin->http_curl_task);
2510     plugin->http_curl_task = GNUNET_SCHEDULER_NO_TASK;
2511   }
2512
2513   GNUNET_free_non_null (plugin->bind4_address);
2514   GNUNET_free_non_null (plugin->bind6_address);
2515   GNUNET_free_non_null(plugin->bind_hostname);
2516 #if BUILD_HTTPS
2517   GNUNET_free_non_null (plugin->crypto_init);
2518   GNUNET_free_non_null (plugin->cert);
2519   GNUNET_free_non_null (plugin->key);
2520 #endif
2521   GNUNET_free (plugin);
2522   GNUNET_free (api);
2523 #if DEBUG_HTTP
2524   GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,"Unload %s plugin complete...\n", PROTOCOL_PREFIX);
2525 #endif
2526   return NULL;
2527 }
2528
2529 #if BUILD_HTTPS
2530 static char *
2531 load_certificate( const char * file )
2532 {
2533   struct GNUNET_DISK_FileHandle * gn_file;
2534
2535   struct stat fstat;
2536   char * text = NULL;
2537
2538   if (0!=STAT(file, &fstat))
2539           return NULL;
2540   text = GNUNET_malloc (fstat.st_size+1);
2541   gn_file = GNUNET_DISK_file_open(file,GNUNET_DISK_OPEN_READ, GNUNET_DISK_PERM_USER_READ);
2542   if (gn_file==NULL)
2543   {
2544           GNUNET_free(text);
2545           return NULL;
2546   }
2547   if (GNUNET_SYSERR == GNUNET_DISK_file_read(gn_file, text, fstat.st_size))
2548   {
2549           GNUNET_free(text);
2550           GNUNET_DISK_file_close(gn_file);
2551           return NULL;
2552   }
2553   text[fstat.st_size] = '\0';
2554   GNUNET_DISK_file_close(gn_file);
2555
2556   return text;
2557 }
2558 #endif
2559
2560
2561 /**
2562  * Entry point for the plugin.
2563  */
2564 void *
2565 LIBGNUNET_PLUGIN_TRANSPORT_INIT (void *cls)
2566 {
2567   struct GNUNET_TRANSPORT_PluginEnvironment *env = cls;
2568   struct Plugin *plugin;
2569   struct GNUNET_TRANSPORT_PluginFunctions *api;
2570   struct GNUNET_TIME_Relative gn_timeout;
2571   long long unsigned int port;
2572   char * component_name;
2573 #if BUILD_HTTPS
2574   char * key_file = NULL;
2575   char * cert_file = NULL;
2576 #endif
2577
2578   GNUNET_assert(cls !=NULL);
2579 #if DEBUG_HTTP
2580   GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,"Starting %s plugin...\n", PROTOCOL_PREFIX);
2581 #endif
2582   GNUNET_asprintf(&component_name,"transport-%s",PROTOCOL_PREFIX);
2583
2584   plugin = GNUNET_malloc (sizeof (struct Plugin));
2585   plugin->stats = env->stats;
2586   plugin->env = env;
2587   plugin->peers = NULL;
2588   plugin->bind4_address = NULL;
2589   plugin->use_ipv6  = GNUNET_YES;
2590   plugin->use_ipv4  = GNUNET_YES;
2591
2592   api = GNUNET_malloc (sizeof (struct GNUNET_TRANSPORT_PluginFunctions));
2593   api->cls = plugin;
2594   api->send = &http_plugin_send;
2595   api->disconnect = &http_plugin_disconnect;
2596   api->address_pretty_printer = &http_plugin_address_pretty_printer;
2597   api->check_address = &http_plugin_address_suggested;
2598   api->address_to_string = &http_plugin_address_to_string;
2599
2600   /* Hashing our identity to use it in URLs */
2601   GNUNET_CRYPTO_hash_to_enc ( &(plugin->env->my_identity->hashPubKey), &plugin->my_ascii_hash_ident);
2602
2603   /* Use IPv6? */
2604   if (GNUNET_CONFIGURATION_have_value (env->cfg,
2605                                                                            component_name, "USE_IPv6"))
2606     {
2607           plugin->use_ipv6 = GNUNET_CONFIGURATION_get_value_yesno (env->cfg,
2608                                                                                                                            component_name,
2609                                                                                                                            "USE_IPv6");
2610     }
2611   /* Use IPv4? */
2612   if (GNUNET_CONFIGURATION_have_value (env->cfg,
2613                                                                            component_name, "USE_IPv4"))
2614     {
2615           plugin->use_ipv4 = GNUNET_CONFIGURATION_get_value_yesno (env->cfg,
2616                                                         component_name,"USE_IPv4");
2617     }
2618   /* Reading port number from config file */
2619   if ((GNUNET_OK !=
2620        GNUNET_CONFIGURATION_get_value_number (env->cfg,
2621                                                                                           component_name,
2622                                               "PORT",
2623                                               &port)) ||
2624       (port > 65535) )
2625     {
2626       GNUNET_log_from (GNUNET_ERROR_TYPE_ERROR,
2627                                            component_name,
2628                        _("Require valid port number for transport plugin `%s' in configuration!\n"),
2629                        PROTOCOL_PREFIX);
2630       GNUNET_free(component_name);
2631       LIBGNUNET_PLUGIN_TRANSPORT_DONE (api);
2632       return NULL;
2633     }
2634
2635   /* Reading ipv4 addresse to bind to from config file */
2636   if ((plugin->use_ipv4==GNUNET_YES) && (GNUNET_CONFIGURATION_have_value (env->cfg,
2637                                                                                                           component_name, "BINDTO4")))
2638   {
2639           GNUNET_break (GNUNET_OK ==
2640                                         GNUNET_CONFIGURATION_get_value_string (env->cfg,
2641                                                                                                                    component_name,
2642                                                                                                                    "BINDTO4",
2643                                                                                                                    &plugin->bind_hostname));
2644           plugin->bind4_address = GNUNET_malloc(sizeof(struct sockaddr_in));
2645           plugin->bind4_address->sin_family = AF_INET;
2646           plugin->bind4_address->sin_port = htons (port);
2647
2648           if (plugin->bind_hostname!=NULL)
2649           {
2650                   if (inet_pton(AF_INET,plugin->bind_hostname, &plugin->bind4_address->sin_addr)<=0)
2651                   {
2652                           GNUNET_log_from (GNUNET_ERROR_TYPE_ERROR,
2653                                                            component_name,
2654                                                            _("Misconfigured address to bind to in configuration!\n"));
2655                           GNUNET_free(plugin->bind4_address);
2656                           GNUNET_free(plugin->bind_hostname);
2657                           plugin->bind_hostname = NULL;
2658                           plugin->bind4_address = NULL;
2659                   }
2660           }
2661   }
2662
2663   /* Reading ipv4 addresse to bind to from config file */
2664   if ((plugin->use_ipv6==GNUNET_YES) && (GNUNET_CONFIGURATION_have_value (env->cfg,
2665                   component_name, "BINDTO6")))
2666   {
2667           if (GNUNET_OK == GNUNET_CONFIGURATION_get_value_string (env->cfg,
2668                                                                                                                           component_name,
2669                                                                                                                           "BINDTO6",
2670                                                                                                                           &plugin->bind_hostname))
2671           {
2672                   plugin->bind6_address = GNUNET_malloc(sizeof(struct sockaddr_in6));
2673                   plugin->bind6_address->sin6_family = AF_INET6;
2674                   plugin->bind6_address->sin6_port = htons (port);
2675                   if (plugin->bind_hostname!=NULL)
2676                   {
2677                           if (inet_pton(AF_INET6,plugin->bind_hostname, &plugin->bind6_address->sin6_addr)<=0)
2678                           {
2679                                   GNUNET_log_from (GNUNET_ERROR_TYPE_ERROR,
2680                                                                    component_name,
2681                                                                    _("Misconfigured address to bind to in configuration!\n"));
2682                                   GNUNET_free(plugin->bind6_address);
2683                                   GNUNET_free(plugin->bind_hostname);
2684                                   plugin->bind_hostname = NULL;
2685                                   plugin->bind6_address = NULL;
2686                           }
2687                   }
2688           }
2689   }
2690
2691 #if BUILD_HTTPS
2692   /* Reading HTTPS crypto related configuration */
2693   /* Get crypto init string from config */
2694   if (GNUNET_CONFIGURATION_have_value (env->cfg,
2695                                                                            "transport-https", "CRYPTO_INIT"))
2696   {
2697                 GNUNET_CONFIGURATION_get_value_string (env->cfg,
2698                                                                                            "transport-https",
2699                                                                                            "CRYPTO_INIT",
2700                                                                                            &plugin->crypto_init);
2701   }
2702   else
2703   {
2704           GNUNET_asprintf(&plugin->crypto_init,"NORMAL");
2705   }
2706
2707 /* Get private key file from config */
2708   if (GNUNET_CONFIGURATION_have_value (env->cfg,
2709                                                                            "transport-https", "KEY_FILE"))
2710   {
2711                 GNUNET_CONFIGURATION_get_value_string (env->cfg,
2712                                                                                            "transport-https",
2713                                                                                            "KEY_FILE",
2714                                                                                            &key_file);
2715   }
2716   if (key_file==NULL)
2717           GNUNET_asprintf(&key_file,"https.key");
2718
2719 /* Get private key file from config */
2720   if (GNUNET_CONFIGURATION_have_value (env->cfg,"transport-https", "CERT_FILE"))
2721   {
2722           GNUNET_CONFIGURATION_get_value_string (env->cfg,
2723                                                                                          "transport-https",
2724                                                                                          "CERT_FILE",
2725                                                                                          &cert_file);
2726   }
2727   if (cert_file==NULL)
2728           GNUNET_asprintf(&cert_file,"https.cert");
2729
2730   /* read key & certificates from file */
2731   GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Loading TLS certificate `%s' `%s'\n", key_file, cert_file);
2732
2733   plugin->key = load_certificate( key_file );
2734   plugin->cert = load_certificate( cert_file );
2735
2736   if ((plugin->key==NULL) || (plugin->cert==NULL))
2737   {
2738           char * cmd;
2739           int ret = 0;
2740           GNUNET_asprintf(&cmd,"gnunet-transport-certificate-creation %s %s", key_file, cert_file);
2741           GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "No usable TLS certificate found, creating certificate \n");
2742           ret = system(cmd);
2743
2744           if (ret != 0)
2745           {
2746                   GNUNET_log_from (GNUNET_ERROR_TYPE_ERROR,
2747                                            "https",
2748                                                    _("Could not create a new TLS certificate, shell script `%s' failed!\n"),cmd,
2749                                                    "transport-https");
2750                   GNUNET_free (key_file);
2751                   GNUNET_free (cert_file);
2752                   GNUNET_free (component_name);
2753
2754                   LIBGNUNET_PLUGIN_TRANSPORT_DONE(api);
2755                   GNUNET_free (cmd);
2756                   return NULL;
2757           }
2758
2759           GNUNET_free (cmd);
2760
2761           plugin->key = load_certificate( key_file );
2762           plugin->cert = load_certificate( cert_file );
2763
2764           if ((plugin->key==NULL) || (plugin->cert==NULL))
2765           {
2766                   GNUNET_log_from (GNUNET_ERROR_TYPE_ERROR,
2767                                            "https",
2768                                                    _("No usable TLS certificate found and creating one failed! \n"),
2769                                                    "transport-https");
2770                   GNUNET_free (key_file);
2771                   GNUNET_free (cert_file);
2772                   GNUNET_free (component_name);
2773
2774                   LIBGNUNET_PLUGIN_TRANSPORT_DONE(api);
2775                   return NULL;
2776           }
2777   }
2778   GNUNET_free (key_file);
2779   GNUNET_free (cert_file);
2780
2781   GNUNET_assert((plugin->key!=NULL) && (plugin->cert!=NULL));
2782   GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "TLS certificate loaded\n");
2783 #endif
2784
2785   GNUNET_assert ((port > 0) && (port <= 65535));
2786   plugin->port_inbound = port;
2787   gn_timeout = GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT;
2788   unsigned int timeout = (gn_timeout.value) / 1000;
2789   if ((plugin->http_server_daemon_v6 == NULL) && (plugin->use_ipv6 == GNUNET_YES) && (port != 0))
2790   {
2791         struct sockaddr * tmp = (struct sockaddr *) plugin->bind6_address;
2792     plugin->http_server_daemon_v6 = MHD_start_daemon (
2793 #if DEBUG_MHD
2794                                                                    MHD_USE_DEBUG |
2795 #endif
2796 #if BUILD_HTTPS
2797                                                                    MHD_USE_SSL |
2798 #endif
2799                                                                    MHD_USE_IPv6,
2800                                        port,
2801                                        &mhd_accept_cb,
2802                                        plugin , &mdh_access_cb, plugin,
2803                                        MHD_OPTION_SOCK_ADDR, tmp,
2804                                        MHD_OPTION_CONNECTION_LIMIT, (unsigned int) 32,
2805                                        //MHD_OPTION_PER_IP_CONNECTION_LIMIT, (unsigned int) 6,
2806 #if BUILD_HTTPS
2807                                        MHD_OPTION_HTTPS_PRIORITIES,  plugin->crypto_init,
2808                                        MHD_OPTION_HTTPS_MEM_KEY, plugin->key,
2809                                        MHD_OPTION_HTTPS_MEM_CERT, plugin->cert,
2810 #endif
2811                                        MHD_OPTION_CONNECTION_TIMEOUT, (unsigned int) timeout,
2812                                        MHD_OPTION_CONNECTION_MEMORY_LIMIT, (size_t) (2 * GNUNET_SERVER_MAX_MESSAGE_SIZE),
2813                                        MHD_OPTION_NOTIFY_COMPLETED, &mhd_termination_cb, NULL,
2814                                        MHD_OPTION_EXTERNAL_LOGGER, mhd_logger, plugin->mhd_log,
2815                                        MHD_OPTION_END);
2816   }
2817   if ((plugin->http_server_daemon_v4 == NULL) && (plugin->use_ipv4 == GNUNET_YES) && (port != 0))
2818   {
2819   plugin->http_server_daemon_v4 = MHD_start_daemon (
2820 #if DEBUG_MHD
2821                                                                    MHD_USE_DEBUG |
2822 #endif
2823 #if BUILD_HTTPS
2824                                                                    MHD_USE_SSL |
2825 #endif
2826                                                                    MHD_NO_FLAG,
2827                                        port,
2828                                        &mhd_accept_cb,
2829                                        plugin , &mdh_access_cb, plugin,
2830                                        MHD_OPTION_SOCK_ADDR, (struct sockaddr_in *)plugin->bind4_address,
2831                                        MHD_OPTION_CONNECTION_LIMIT, (unsigned int) 32,
2832                                        //MHD_OPTION_PER_IP_CONNECTION_LIMIT, (unsigned int) 6,
2833 #if BUILD_HTTPS
2834                                        MHD_OPTION_HTTPS_PRIORITIES,  plugin->crypto_init,
2835                                        MHD_OPTION_HTTPS_MEM_KEY, plugin->key,
2836                                        MHD_OPTION_HTTPS_MEM_CERT, plugin->cert,
2837 #endif
2838                                        MHD_OPTION_CONNECTION_TIMEOUT, (unsigned int) timeout,
2839                                        MHD_OPTION_CONNECTION_MEMORY_LIMIT, (size_t) (2 * GNUNET_SERVER_MAX_MESSAGE_SIZE),
2840                                        MHD_OPTION_NOTIFY_COMPLETED, &mhd_termination_cb, NULL,
2841                                        MHD_OPTION_EXTERNAL_LOGGER, mhd_logger, plugin->mhd_log,
2842                                        MHD_OPTION_END);
2843   }
2844   if (plugin->http_server_daemon_v4 != NULL)
2845     plugin->http_server_task_v4 = http_server_daemon_prepare (plugin, plugin->http_server_daemon_v4);
2846   if (plugin->http_server_daemon_v6 != NULL)
2847     plugin->http_server_task_v6 = http_server_daemon_prepare (plugin, plugin->http_server_daemon_v6);
2848
2849
2850   if (plugin->http_server_task_v4 != GNUNET_SCHEDULER_NO_TASK)
2851   {
2852 #if DEBUG_HTTP
2853           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);
2854 #endif
2855   }
2856   else if ((plugin->http_server_task_v6 != GNUNET_SCHEDULER_NO_TASK) && (plugin->http_server_task_v4 != GNUNET_SCHEDULER_NO_TASK))
2857   {
2858 #if DEBUG_HTTP
2859     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);
2860 #endif
2861   }
2862   else if ((plugin->http_server_task_v6 != GNUNET_SCHEDULER_NO_TASK) && (plugin->http_server_task_v4 == GNUNET_SCHEDULER_NO_TASK))
2863   {
2864 #if DEBUG_HTTP
2865     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);
2866 #endif
2867   }
2868   else
2869   {
2870         char * tmp = NULL;
2871         if ((plugin->use_ipv6 == GNUNET_YES) && (plugin->use_ipv4 == GNUNET_YES))
2872                 GNUNET_asprintf(&tmp,"with IPv4 and IPv6 enabled");
2873         if ((plugin->use_ipv6 == GNUNET_NO) && (plugin->use_ipv4 == GNUNET_YES))
2874                 GNUNET_asprintf(&tmp,"with IPv4 enabled");
2875         if ((plugin->use_ipv6 == GNUNET_YES) && (plugin->use_ipv4 == GNUNET_NO))
2876                 GNUNET_asprintf(&tmp,"with IPv6 enabled");
2877         if ((plugin->use_ipv6 == GNUNET_NO) && (plugin->use_ipv4 == GNUNET_NO))
2878                 GNUNET_asprintf(&tmp,"with NO IP PROTOCOL enabled");
2879         GNUNET_log (GNUNET_ERROR_TYPE_ERROR,"HTTP Server with %s could not be started on port %u! %s plugin failed!\n",tmp, port, PROTOCOL_PREFIX);
2880         GNUNET_free (tmp);
2881     GNUNET_free (component_name);
2882     LIBGNUNET_PLUGIN_TRANSPORT_DONE (api);
2883     return NULL;
2884   }
2885
2886   /* Initializing cURL */
2887   curl_global_init(CURL_GLOBAL_ALL);
2888   plugin->multi_handle = curl_multi_init();
2889
2890   if ( NULL == plugin->multi_handle )
2891   {
2892     GNUNET_log_from (GNUNET_ERROR_TYPE_ERROR,
2893                                          component_name,
2894                                          _("Could not initialize curl multi handle, failed to start %s plugin!\n"),
2895                                          PROTOCOL_PREFIX);
2896     GNUNET_free(component_name);
2897     LIBGNUNET_PLUGIN_TRANSPORT_DONE (api);
2898     return NULL;
2899   }
2900
2901   plugin->peers = GNUNET_CONTAINER_multihashmap_create (10);
2902   GNUNET_OS_network_interfaces_list (&process_interfaces, plugin);
2903
2904   GNUNET_free(component_name);
2905   return api;
2906 }
2907
2908 /* end of plugin_transport_http.c */