src/mesh/mesh_api.c

   1 /*
   2      This file is part of GNUnet.
   3      (C) 2009, 2010 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 mesh/mesh_api.c
  23  * @brief mesh service; API for the Mesh. This is used to talk to arbitrary peers
  24  *        as of 2011-01Jan-06 this is a mockup.
  25  * @author Philipp Tölke
  26  */
  27 #include <platform.h>
  28 #include <gnunet_constants.h>
  29 #include <gnunet_mesh_service.h>
  30 #include <gnunet_core_service.h>
  31 #include <gnunet_container_lib.h>
  32
  33 struct tunnel_id
  34 {
  35   uint32_t id GNUNET_PACKED;
  36   struct GNUNET_PeerIdentity initiator;
  37   struct GNUNET_PeerIdentity target;
  38 };
  39
  40 static uint32_t current_id = 0;
  41
  42 struct tunnel_message
  43 {
  44   struct GNUNET_MessageHeader hdr;
  45   struct tunnel_id id;
  46   /* followed by another GNUNET_MessageHeader */
  47 };
  48
  49 struct notify_cls
  50 {
  51   void* notify_cls;
  52   GNUNET_CONNECTION_TransmitReadyNotify notify;
  53   struct GNUNET_MESH_Tunnel *tunnel;
  54 };
  55
  56 struct GNUNET_MESH_Tunnel
  57 {
  58   /* The other peer this tunnel leads to; just unicast for the moment! */
  59   struct GNUNET_PeerIdentity peer;
  60
  61   struct tunnel_id id;
  62
  63   /* The handlers and cls for outbound tunnels. Are NULL for inbound tunnels. */
  64   GNUNET_MESH_TunnelDisconnectHandler disconnect_handler;
  65   GNUNET_MESH_TunnelConnectHandler connect_handler;
  66   void *handler_cls;
  67
  68   struct GNUNET_MESH_Handle* handle;
  69
  70   /* The message-type requested for this tunnel. Is only needed for pending
  71    * by_tupe-tunnels
  72    */
  73   uint16_t message_type;
  74
  75   /* The context of the receive-function. */
  76   void *ctx;
  77 };
  78
  79 struct tunnel_list_element
  80 {
  81   struct GNUNET_MESH_Tunnel tunnel;
  82   struct tunnel_list_element *next, *prev;
  83 };
  84
  85 struct tunnel_list
  86 {
  87   struct tunnel_list_element *head, *tail;
  88 };
  89
  90 struct peer_list_element
  91 {
  92   struct GNUNET_PeerIdentity peer;
  93
  94   /* how many Message-Types can this peer receive */
  95   unsigned int num_types;
  96
  97   /* array of message-types */
  98   GNUNET_MESH_ApplicationType *types;
  99
 100   struct GNUNET_TRANSPORT_ATS_Information atsi;
 101   struct peer_list_element *next, *prev;
 102 };
 103
 104 struct peer_list
 105 {
 106   struct peer_list_element *head, *tail;
 107 };
 108
 109 struct GNUNET_MESH_Handle
 110 {
 111   struct GNUNET_CORE_Handle *core;
 112   struct GNUNET_MESH_MessageHandler *handlers;
 113   struct GNUNET_PeerIdentity myself;
 114   unsigned int connected_to_core;
 115   struct peer_list connected_peers;
 116   struct tunnel_list established_tunnels;
 117   struct tunnel_list pending_tunnels;
 118   struct tunnel_list pending_by_type_tunnels;
 119   void *cls;
 120   GNUNET_MESH_TunnelEndHandler *cleaner;
 121   size_t hello_message_size;
 122   uint16_t *hello_message;
 123 };
 124
 125 static void
 126 send_end_connect(void* cls,
 127                      const struct GNUNET_SCHEDULER_TaskContext* tc)
 128 {
 129   struct GNUNET_MESH_Tunnel* tunnel = cls;
 130
 131   tunnel->connect_handler(tunnel->handler_cls, NULL, NULL);
 132 }
 133
 134 static void
 135 send_self_connect(void* cls,
 136                         const struct GNUNET_SCHEDULER_TaskContext* tc)
 137 {
 138   struct GNUNET_MESH_Tunnel* tunnel = cls;
 139
 140   tunnel->connect_handler(tunnel->handler_cls, &tunnel->handle->myself, NULL);
 141   GNUNET_SCHEDULER_add_now(send_end_connect, tunnel);
 142 }
 143
 144 static void
 145 core_startup (void *cls,
 146               struct GNUNET_CORE_Handle *core,
 147               const struct GNUNET_PeerIdentity *my_identity,
 148               const struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded *publicKey)
 149 {
 150   struct GNUNET_MESH_Handle *handle = cls;
 151   memcpy (&handle->myself, my_identity, sizeof (struct GNUNET_PeerIdentity));
 152   handle->connected_to_core = GNUNET_YES;
 153 }
 154
 155 static size_t
 156 send_hello_message (void *cls, size_t size, void *buf)
 157 {
 158   struct GNUNET_MESH_Handle *handle = cls;
 159   struct GNUNET_MessageHeader *hdr = buf;
 160
 161   size_t sent = sizeof(struct GNUNET_MessageHeader) + handle->hello_message_size;
 162
 163   hdr->type = htons(GNUNET_MESSAGE_TYPE_MESH_HELLO);
 164   hdr->size = htons(size);
 165
 166   memcpy(hdr+1, handle->hello_message, handle->hello_message_size);
 167   return sent;
 168 }
 169
 170
 171 /**
 172  * Core calls this if we are connected to a new peer.
 173  *
 174  * If core tells us that we are connected to ourself, we ignore it. Otherwise, the
 175  * peer is added to the connected_peers-list.
 176  *
 177  */
 178 static void
 179 core_connect (void *cls,
 180               const struct GNUNET_PeerIdentity *peer,
 181               const struct GNUNET_TRANSPORT_ATS_Information *atsi)
 182 {
 183   struct GNUNET_MESH_Handle *handle = cls;
 184   /* Check for connect-to-self-message, which we ignore */
 185   if (0 ==
 186       memcmp (peer, &handle->myself, sizeof (struct GNUNET_PeerIdentity)))
 187     return;
 188
 189
 190   /* put the new peer into the list of connected peers */
 191   struct peer_list_element *element =
 192     GNUNET_malloc (sizeof (struct peer_list_element));
 193   memcpy (&element->peer, peer, sizeof (struct GNUNET_PeerIdentity));
 194   memcpy (&element->atsi, atsi,
 195           sizeof (struct GNUNET_TRANSPORT_ATS_Information));
 196
 197   GNUNET_CONTAINER_DLL_insert_after (handle->connected_peers.head,
 198                                      handle->connected_peers.tail,
 199                                      handle->connected_peers.tail, element);
 200
 201   struct tunnel_list_element *tunnel = handle->pending_tunnels.head;
 202   while (tunnel != NULL)
 203     {
 204       if (0 ==
 205           memcmp (&tunnel->tunnel.peer, peer,
 206                   sizeof (struct GNUNET_PeerIdentity)))
 207         {
 208           struct tunnel_list_element *next = tunnel->next;
 209           GNUNET_CONTAINER_DLL_remove (handle->pending_tunnels.head,
 210                                        handle->pending_tunnels.tail, tunnel);
 211           GNUNET_CONTAINER_DLL_insert_after (handle->established_tunnels.head,
 212                                              handle->established_tunnels.tail,
 213                                              handle->established_tunnels.tail,
 214                                              tunnel);
 215           tunnel->tunnel.connect_handler (tunnel->tunnel.handler_cls,
 216                                           peer, atsi);
 217           GNUNET_SCHEDULER_add_now(send_end_connect, tunnel);
 218           tunnel = next;
 219         }
 220       else
 221         tunnel = tunnel->next;
 222     }
 223   GNUNET_CORE_notify_transmit_ready(handle->core,
 224                                     GNUNET_NO,
 225                                     42,
 226                                     GNUNET_TIME_UNIT_SECONDS,
 227                                     peer,
 228                                     sizeof(struct GNUNET_MessageHeader) + handle->hello_message_size,
 229                                     &send_hello_message,
 230                                     cls);
 231
 232 }
 233
 234 /**
 235  * Core calls this if we disconnect a peer
 236  *
 237  * Remove this peer from the list of connected peers
 238  * Close all tunnels this peer belongs to
 239  */
 240 static void
 241 core_disconnect (void *cls, const struct GNUNET_PeerIdentity *peer)
 242 {
 243   struct GNUNET_MESH_Handle *handle = cls;
 244
 245   struct peer_list_element *element = handle->connected_peers.head;
 246   while (element != NULL)
 247     {
 248       if (0 ==
 249           memcmp (&element->peer, peer, sizeof (struct GNUNET_PeerIdentity)))
 250         break;
 251       element = element->next;
 252     }
 253   if (element != NULL)
 254     {
 255       GNUNET_CONTAINER_DLL_remove (handle->connected_peers.head,
 256                                    handle->connected_peers.tail, element);
 257       GNUNET_free_non_null(element->types);
 258       GNUNET_free (element);
 259     }
 260
 261   struct tunnel_list_element *telement = handle->established_tunnels.head;
 262   while (telement != NULL)
 263     {
 264       if (0 ==
 265           memcmp (&telement->tunnel.peer, peer,
 266                   sizeof (struct GNUNET_PeerIdentity)))
 267         {
 268           /* disconnect tunnels */
 269           /* outbound tunnels */
 270           if (telement->tunnel.connect_handler != NULL && NULL != telement->tunnel.disconnect_handler)
 271             telement->tunnel.disconnect_handler (telement->tunnel.handler_cls,
 272                                                  peer);
 273           /* inbound tunnels */
 274           else if (NULL != handle->cleaner)
 275             handle->cleaner (handle->cls, &telement->tunnel,
 276                              &telement->tunnel.ctx);
 277
 278           struct tunnel_list_element *next = telement->next;
 279           GNUNET_CONTAINER_DLL_remove (handle->established_tunnels.head,
 280                                        handle->established_tunnels.tail,
 281                                        telement);
 282           GNUNET_free (telement);
 283           telement = next;
 284         }
 285       else
 286         {
 287           telement = telement->next;
 288         }
 289     }
 290 }
 291
 292 /**
 293  * Receive a message from core.
 294  * This is a hello-message, containing the message-types the other peer can receive
 295  */
 296 static int
 297 receive_hello (void *cls,
 298                const struct GNUNET_PeerIdentity *other,
 299                const struct GNUNET_MessageHeader *message,
 300                const struct GNUNET_TRANSPORT_ATS_Information *atsi)
 301 {
 302   struct GNUNET_MESH_Handle *handle = cls;
 303   uint16_t *num = (uint16_t *) (message + 1);
 304   uint16_t *ports = num + 1;
 305   unsigned int i;
 306
 307   struct peer_list_element *element = handle->connected_peers.head;
 308   while (element != NULL)
 309     {
 310       if (0 ==
 311           memcmp (&element->peer, other, sizeof (struct GNUNET_PeerIdentity)))
 312         break;
 313       element = element->next;
 314     }
 315
 316   element->num_types = *num;
 317   element->types = GNUNET_malloc (*num * sizeof (GNUNET_MESH_ApplicationType));
 318
 319   for (i = 0; i < *num; i++)
 320     element->types[i] = (GNUNET_MESH_ApplicationType)ntohs (ports[i]);
 321
 322   struct tunnel_list_element *tunnel = handle->pending_by_type_tunnels.head;
 323   while (tunnel != NULL)
 324     {
 325       struct tunnel_list_element *next = tunnel->next;
 326       for (i = 0; i < *num; i++)
 327         {
 328           if (ntohs (ports[i]) == tunnel->tunnel.message_type)
 329             {
 330               GNUNET_CONTAINER_DLL_remove (handle->pending_tunnels.head,
 331                                            handle->pending_tunnels.tail,
 332                                            tunnel);
 333               GNUNET_CONTAINER_DLL_insert_after (handle->established_tunnels.
 334                                                  head,
 335                                                  handle->established_tunnels.
 336                                                  tail,
 337                                                  handle->established_tunnels.
 338                                                  tail, tunnel);
 339               tunnel->tunnel.connect_handler (tunnel->tunnel.handler_cls,
 340                                               &tunnel->tunnel.peer, atsi);
 341               GNUNET_SCHEDULER_add_now (send_end_connect, tunnel);
 342               break;
 343             }
 344         }
 345       if (ntohs (ports[i]) == tunnel->tunnel.message_type)
 346         tunnel = next;
 347       else
 348         tunnel = tunnel->next;
 349     }
 350   return GNUNET_OK;
 351 }
 352
 353 /**
 354  * Receive a message from core.
 355  */
 356 static int
 357 core_receive (void *cls,
 358               const struct GNUNET_PeerIdentity *other,
 359               const struct GNUNET_MessageHeader *message,
 360               const struct GNUNET_TRANSPORT_ATS_Information *atsi)
 361 {
 362   struct GNUNET_MESH_Handle *handle = cls;
 363   struct tunnel_message *tmessage = (struct tunnel_message *) message;
 364   struct GNUNET_MessageHeader *rmessage =
 365     (struct GNUNET_MessageHeader *) (tmessage + 1);
 366
 367   struct GNUNET_MESH_MessageHandler *handler;
 368
 369   for (handler = handle->handlers; handler->callback != NULL; handler++)
 370     {
 371       if ( (ntohs (rmessage->type) == handler->type)
 372            && ( (handler->expected_size == 0)
 373                 || (handler->expected_size == ntohs (rmessage->size))) )
 374         {
 375           break;
 376         }
 377     }
 378
 379   /* handler->callback handles this message */
 380
 381   /* If no handler was found, drop the message but keep the channel open */
 382   if (handler->callback == NULL)
 383     return GNUNET_OK;
 384
 385   struct tunnel_list_element *tunnel = handle->established_tunnels.head;
 386
 387   while (tunnel != NULL)
 388     {
 389       if (tunnel->tunnel.id.id == tmessage->id.id &&
 390           (0 ==
 391            memcmp (&tmessage->id.initiator, &tunnel->tunnel.id.initiator,
 392                    sizeof (struct GNUNET_PeerIdentity)))
 393           && (0 ==
 394               memcmp (&tmessage->id.target, &tunnel->tunnel.id.target,
 395                       sizeof (struct GNUNET_PeerIdentity))))
 396         break;
 397       tunnel = tunnel->next;
 398     }
 399
 400   /* if no tunnel was found: create a new inbound tunnel */
 401   if (tunnel == NULL)
 402     {
 403       tunnel = GNUNET_malloc (sizeof (struct tunnel_list_element));
 404       tunnel->tunnel.connect_handler = NULL;
 405       tunnel->tunnel.disconnect_handler = NULL;
 406       tunnel->tunnel.handler_cls = NULL;
 407       tunnel->tunnel.ctx = NULL;
 408       tunnel->tunnel.handle = handle;
 409       memcpy (&tunnel->tunnel.peer, other,
 410               sizeof (struct GNUNET_PeerIdentity));
 411       memcpy (&tunnel->tunnel.id, &tmessage->id, sizeof (struct tunnel_id));
 412
 413       GNUNET_CONTAINER_DLL_insert_after (handle->established_tunnels.head,
 414                                          handle->established_tunnels.tail,
 415                                          handle->established_tunnels.tail,
 416                                          tunnel);
 417     }
 418
 419   return handler->callback (handle->cls, &tunnel->tunnel,
 420                             &tunnel->tunnel.ctx, other, rmessage, atsi);
 421 }
 422
 423 struct GNUNET_MESH_Tunnel *
 424 GNUNET_MESH_peer_request_connect_by_type (struct GNUNET_MESH_Handle *handle,
 425                                           struct GNUNET_TIME_Relative timeout,
 426                                           GNUNET_MESH_ApplicationType message_type,
 427                                           GNUNET_MESH_TunnelConnectHandler
 428                                           connect_handler,
 429                                           GNUNET_MESH_TunnelDisconnectHandler
 430                                           disconnect_handler,
 431                                           void *handler_cls)
 432 {
 433   /* Look in the list of connected peers */
 434   struct peer_list_element *element = handle->connected_peers.head;
 435   while (element != NULL)
 436     {
 437       unsigned int i;
 438       for (i = 0; i < element->num_types; i++)
 439         if (message_type == element->types[i])
 440           return GNUNET_MESH_peer_request_connect_all (handle, timeout, 1,
 441                                                        &handle->myself,
 442                                                        connect_handler,
 443                                                        disconnect_handler,
 444                                                        handler_cls);
 445       element = element->next;
 446     }
 447
 448   /* Put into pending list */
 449   struct tunnel_list_element *tunnel =
 450     GNUNET_malloc (sizeof (struct tunnel_list_element));
 451
 452   tunnel->tunnel.connect_handler = connect_handler;
 453   tunnel->tunnel.disconnect_handler = disconnect_handler;
 454   tunnel->tunnel.handler_cls = handler_cls;
 455   tunnel->tunnel.ctx = NULL;
 456   tunnel->tunnel.handle = handle;
 457   memcpy (&tunnel->tunnel.id.initiator, &handle->myself,
 458           sizeof (struct GNUNET_PeerIdentity));
 459   tunnel->tunnel.id.id = current_id++;
 460   tunnel->tunnel.message_type = message_type;
 461
 462   GNUNET_CONTAINER_DLL_insert_after (handle->pending_by_type_tunnels.head,
 463                                      handle->pending_by_type_tunnels.tail,
 464                                      handle->pending_by_type_tunnels.tail,
 465                                      tunnel);
 466   return &tunnel->tunnel;
 467 }
 468
 469
 470
 471 struct GNUNET_MESH_Tunnel *
 472 GNUNET_MESH_peer_request_connect_all (struct GNUNET_MESH_Handle *handle,
 473                                       struct GNUNET_TIME_Relative timeout,
 474                                       unsigned int num_peers,
 475                                       const struct GNUNET_PeerIdentity *peers,
 476                                       GNUNET_MESH_TunnelConnectHandler
 477                                       connect_handler,
 478                                       GNUNET_MESH_TunnelDisconnectHandler
 479                                       disconnect_handler, void *handler_cls)
 480 {
 481   if (num_peers != 1)
 482     return NULL;
 483
 484   struct tunnel_list_element *tunnel =
 485     GNUNET_malloc (sizeof (struct tunnel_list_element));
 486
 487   tunnel->tunnel.connect_handler = connect_handler;
 488   tunnel->tunnel.disconnect_handler = disconnect_handler;
 489   tunnel->tunnel.handler_cls = handler_cls;
 490   tunnel->tunnel.ctx = NULL;
 491   tunnel->tunnel.handle = handle;
 492   memcpy (&tunnel->tunnel.id.initiator, &handle->myself,
 493           sizeof (struct GNUNET_PeerIdentity));
 494   memcpy (&tunnel->tunnel.id.target, peers,
 495           sizeof (struct GNUNET_PeerIdentity));
 496   tunnel->tunnel.id.id = current_id++;
 497   memcpy (&tunnel->tunnel.peer, peers, sizeof(struct GNUNET_PeerIdentity));
 498
 499   struct peer_list_element *element = handle->connected_peers.head;
 500   while (element != NULL)
 501     {
 502       if (0 ==
 503           memcmp (&element->peer, peers, sizeof (struct GNUNET_PeerIdentity)))
 504         break;
 505       element = element->next;
 506     }
 507
 508   if (element != NULL)
 509     {
 510       /* we are connected to this peer */
 511       GNUNET_CONTAINER_DLL_insert_after (handle->established_tunnels.head,
 512                                          handle->established_tunnels.tail,
 513                                          handle->established_tunnels.tail,
 514                                          tunnel);
 515       connect_handler (handler_cls, &element->peer, &element->atsi);
 516     }
 517   else if (0 ==
 518            memcmp (peers, &handle->myself,
 519                    sizeof (struct GNUNET_PeerIdentity)))
 520     {
 521       /* we are the peer */
 522       GNUNET_CONTAINER_DLL_insert_after (handle->established_tunnels.head,
 523                                          handle->established_tunnels.tail,
 524                                          handle->established_tunnels.tail,
 525                                          tunnel);
 526       GNUNET_SCHEDULER_add_now(send_self_connect, tunnel);
 527     }
 528   else
 529     {
 530       /* we are not connected to this peer */
 531       GNUNET_CONTAINER_DLL_insert_after (handle->pending_tunnels.head,
 532                                          handle->pending_tunnels.tail,
 533                                          handle->pending_tunnels.tail,
 534                                          tunnel);
 535       (void) GNUNET_CORE_peer_request_connect (handle->core,
 536                                                timeout,
 537                                                peers,
 538                                                NULL, NULL);
 539     }
 540
 541   return &tunnel->tunnel;
 542 }
 543
 544 const struct GNUNET_PeerIdentity*
 545 GNUNET_MESH_get_peer(const struct GNUNET_MESH_Tunnel* tunnel)
 546 {
 547   return &tunnel->peer;
 548 }
 549
 550 static size_t
 551 core_notify(void* cls, size_t size, void* buf)
 552 {
 553   struct notify_cls *ncls = cls;
 554   struct GNUNET_MESH_Tunnel *tunnel = ncls->tunnel;
 555   struct tunnel_message* message = buf;
 556   void* cbuf = (void*) &message[1];
 557   GNUNET_assert(NULL != ncls->notify);
 558
 559   size_t sent = ncls->notify(ncls->notify_cls, size - sizeof(struct tunnel_message), cbuf);
 560
 561   GNUNET_free(ncls);
 562
 563   if (0 == sent) return 0;
 564
 565   sent += sizeof(struct tunnel_message);
 566
 567   message->hdr.type = htons(GNUNET_MESSAGE_TYPE_MESH);
 568   message->hdr.size = htons(sent);
 569   memcpy(&message->id, &tunnel->id, sizeof(struct tunnel_id));
 570   return sent;
 571 }
 572
 573
 574 /**
 575  * Ask the mesh to call "notify" once it is ready to transmit the
 576  * given number of bytes to the specified "target".  If we are not yet
 577  * connected to the specified peer, a call to this function will cause
 578  * us to try to establish a connection.
 579  *
 580  * @param tunnel tunnel to use for transmission
 581  * @param cork is corking allowed for this transmission?
 582  * @param priority how important is the message?
 583  * @param maxdelay how long can the message wait?
 584  * @param target destination for the message, NULL for multicast to all tunnel targets
 585  * @param notify_size how many bytes of buffer space does notify want?
 586  * @param notify function to call when buffer space is available;
 587  *        will be called with NULL on timeout or if the overall queue
 588  *        for this peer is larger than queue_size and this is currently
 589  *        the message with the lowest priority
 590  * @param notify_cls closure for notify
 591  * @return non-NULL if the notify callback was queued,
 592  *         NULL if we can not even queue the request (insufficient
 593  *         memory); if NULL is returned, "notify" will NOT be called.
 594  */
 595 struct GNUNET_MESH_TransmitHandle *
 596 GNUNET_MESH_notify_transmit_ready (struct
 597                                    GNUNET_MESH_Tunnel
 598                                    *tunnel,
 599                                    int cork,
 600                                    uint32_t priority,
 601                                    struct
 602                                    GNUNET_TIME_Relative
 603                                    maxdelay,
 604                                    const struct GNUNET_PeerIdentity *target,
 605                                    size_t
 606                                    notify_size,
 607                                    GNUNET_CONNECTION_TransmitReadyNotify
 608                                    notify, void *notify_cls)
 609 {
 610   struct notify_cls *cls = GNUNET_malloc(sizeof(struct notify_cls));
 611   cls->notify_cls = notify_cls;
 612   GNUNET_assert(NULL != notify);
 613   cls->notify = notify;
 614   cls->tunnel = tunnel;
 615   GNUNET_CORE_notify_transmit_ready(tunnel->handle->core,
 616                                     cork,
 617                                     priority,
 618                                     maxdelay,
 619                                     &tunnel->peer,
 620                                     notify_size + sizeof(struct tunnel_message),
 621                                     &core_notify,
 622                                     (void*)cls);
 623
 624   /* aborting is not implemented yet */
 625   return (struct GNUNET_MESH_TransmitHandle*) 1;
 626 }
 627
 628
 629 struct GNUNET_MESH_Handle *
 630 GNUNET_MESH_connect (const struct
 631                      GNUNET_CONFIGURATION_Handle
 632                      *cfg, void *cls,
 633                      GNUNET_MESH_TunnelEndHandler
 634                      cleaner,
 635                      const struct GNUNET_MESH_MessageHandler *handlers,
 636                      const GNUNET_MESH_ApplicationType *stypes)
 637 {
 638   struct GNUNET_MESH_Handle *ret =
 639     GNUNET_malloc (sizeof (struct GNUNET_MESH_Handle));
 640
 641   ret->connected_to_core = GNUNET_NO;
 642   ret->connected_peers.head = NULL;
 643   ret->connected_peers.tail = NULL;
 644   ret->cleaner = cleaner;
 645   ret->cls = cls;
 646
 647   const struct GNUNET_MESH_MessageHandler *it;
 648   unsigned int len = 1;
 649   for (it = handlers; it->callback != NULL; it++)
 650     {
 651       len++;
 652     }
 653
 654   ret->handlers =
 655     GNUNET_malloc (len * sizeof (struct GNUNET_MESH_MessageHandler));
 656   memset(ret->handlers, 0, len * sizeof(struct GNUNET_MESH_MessageHandler));
 657   memcpy (ret->handlers, handlers,
 658           len * sizeof (struct GNUNET_MESH_MessageHandler));
 659
 660   const static struct GNUNET_CORE_MessageHandler core_handlers[] = {
 661     {&core_receive, GNUNET_MESSAGE_TYPE_MESH, 0},
 662     {&receive_hello, GNUNET_MESSAGE_TYPE_MESH_HELLO, 0},
 663     {NULL, 0, 0}
 664   };
 665
 666   ret->core = GNUNET_CORE_connect (cfg,
 667                                    42,
 668                                    ret,
 669                                    &core_startup,
 670                                    &core_connect,
 671                                    &core_disconnect,
 672                                    NULL,
 673                                    NULL,
 674                                    GNUNET_NO, NULL, GNUNET_NO, core_handlers);
 675   return ret;
 676 }
 677
 678 void
 679 GNUNET_MESH_disconnect (struct GNUNET_MESH_Handle *handle)
 680 {
 681   GNUNET_free (handle->handlers);
 682   GNUNET_CORE_disconnect (handle->core);
 683
 684   struct peer_list_element *element = handle->connected_peers.head;
 685   while (element != NULL)
 686     {
 687       struct peer_list_element *next = element->next;
 688       GNUNET_free (element);
 689       element = next;
 690     }
 691
 692   struct tunnel_list_element *tunnel = handle->pending_tunnels.head;
 693   while (tunnel != NULL)
 694     {
 695       struct tunnel_list_element *next = tunnel->next;
 696       GNUNET_free (tunnel);
 697       tunnel = next;
 698     }
 699   tunnel = handle->established_tunnels.head;;
 700   while (tunnel != NULL)
 701     {
 702       struct tunnel_list_element *next = tunnel->next;
 703       GNUNET_free (tunnel);
 704       tunnel = next;
 705     }
 706
 707   GNUNET_free (handle);
 708 }
 709
 710 /* end of mesh_api.c */