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 #include <gnunet_applications.h>
  33
  34 struct tunnel_id
  35 {
  36   uint32_t id GNUNET_PACKED;
  37   struct GNUNET_PeerIdentity initiator;
  38   struct GNUNET_PeerIdentity target;
  39 };
  40
  41 static uint32_t current_id = 0;
  42
  43 struct tunnel_message
  44 {
  45   struct GNUNET_MessageHeader hdr;
  46   struct tunnel_id id;
  47   /* followed by another GNUNET_MessageHeader */
  48 };
  49
  50 struct notify_cls
  51 {
  52   void* notify_cls;
  53   GNUNET_CONNECTION_TransmitReadyNotify notify;
  54   struct GNUNET_MESH_Tunnel *tunnel;
  55 };
  56
  57 struct GNUNET_MESH_Tunnel
  58 {
  59   /* The other peer this tunnel leads to; just unicast for the moment! */
  60   struct GNUNET_PeerIdentity peer;
  61
  62   struct tunnel_id id;
  63
  64   /* The handlers and cls for outbound tunnels. Are NULL for inbound tunnels. */
  65   GNUNET_MESH_TunnelDisconnectHandler disconnect_handler;
  66   GNUNET_MESH_TunnelConnectHandler connect_handler;
  67   void *handler_cls;
  68
  69   struct GNUNET_MESH_Handle* handle;
  70
  71   /* The application-type requested for this tunnel. Is only needed for pending
  72    * by_tupe-tunnels
  73    */
  74   uint16_t application_type;
  75
  76   /* The context of the receive-function. */
  77   void *ctx;
  78 };
  79
  80 struct tunnel_list_element
  81 {
  82   struct GNUNET_MESH_Tunnel tunnel;
  83   struct tunnel_list_element *next, *prev;
  84 };
  85
  86 struct tunnel_list
  87 {
  88   struct tunnel_list_element *head, *tail;
  89 };
  90
  91 struct peer_list_element
  92 {
  93   struct GNUNET_PeerIdentity peer;
  94
  95   /* how many Message-Types can this peer receive */
  96   unsigned int num_types;
  97
  98   /* array of message-types */
  99   GNUNET_MESH_ApplicationType *types;
 100
 101   struct GNUNET_TRANSPORT_ATS_Information atsi;
 102   struct peer_list_element *next, *prev;
 103 };
 104
 105 struct peer_list
 106 {
 107   struct peer_list_element *head, *tail;
 108 };
 109
 110 struct GNUNET_MESH_Handle
 111 {
 112   struct GNUNET_CORE_Handle *core;
 113   struct GNUNET_MESH_MessageHandler *handlers;
 114   struct GNUNET_PeerIdentity myself;
 115   unsigned int connected_to_core;
 116   struct peer_list connected_peers;
 117   struct tunnel_list established_tunnels;
 118   struct tunnel_list pending_tunnels;
 119   struct tunnel_list pending_by_type_tunnels;
 120   void *cls;
 121   GNUNET_MESH_TunnelEndHandler *cleaner;
 122   size_t hello_message_size;
 123   uint16_t *hello_message;
 124 };
 125
 126 static void
 127 send_end_connect(void* cls,
 128                      const struct GNUNET_SCHEDULER_TaskContext* tc)
 129 {
 130   if ( (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN) != 0)
 131     return;
 132
 133   struct GNUNET_MESH_Tunnel* tunnel = cls;
 134
 135   tunnel->connect_handler(tunnel->handler_cls, NULL, NULL);
 136 }
 137
 138 static void
 139 send_self_connect(void* cls,
 140                         const struct GNUNET_SCHEDULER_TaskContext* tc)
 141 {
 142   if ( (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN) != 0)
 143       return;
 144
 145   struct GNUNET_MESH_Tunnel* tunnel = cls;
 146
 147   tunnel->connect_handler(tunnel->handler_cls, &tunnel->handle->myself, NULL);
 148   GNUNET_SCHEDULER_add_now(send_end_connect, tunnel);
 149 }
 150
 151 static void
 152 call_connect_handler (void *cls,
 153                       const struct GNUNET_SCHEDULER_TaskContext *tc)
 154 {
 155   if ( (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN) != 0)
 156       return;
 157
 158   struct GNUNET_MESH_Tunnel *tunnel = cls;
 159
 160   tunnel->connect_handler (tunnel->handler_cls, &tunnel->peer,
 161                            NULL);
 162   GNUNET_SCHEDULER_add_now (send_end_connect, tunnel);
 163 }
 164
 165 static void
 166 core_startup (void *cls,
 167               struct GNUNET_CORE_Handle *core,
 168               const struct GNUNET_PeerIdentity *my_identity,
 169               const struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded *publicKey)
 170 {
 171   struct GNUNET_MESH_Handle *handle = cls;
 172   memcpy (&handle->myself, my_identity, sizeof (struct GNUNET_PeerIdentity));
 173   handle->connected_to_core = GNUNET_YES;
 174 }
 175
 176 static size_t
 177 send_hello_message (void *cls, size_t size, void *buf)
 178 {
 179   if (cls == NULL) return 0;
 180   struct GNUNET_MESH_Handle *handle = cls;
 181   struct GNUNET_MessageHeader *hdr = buf;
 182
 183   size_t sent = sizeof(struct GNUNET_MessageHeader) + handle->hello_message_size;
 184
 185   hdr->type = htons(GNUNET_MESSAGE_TYPE_MESH_HELLO);
 186   hdr->size = htons(size);
 187
 188   memcpy(hdr+1, handle->hello_message, handle->hello_message_size);
 189   return sent;
 190 }
 191
 192
 193 /**
 194  * Core calls this if we are connected to a new peer.
 195  *
 196  * The peer is added to the connected_peers-list.
 197  *
 198  */
 199 static void
 200 core_connect (void *cls,
 201               const struct GNUNET_PeerIdentity *peer,
 202               const struct GNUNET_TRANSPORT_ATS_Information *atsi)
 203 {
 204   struct GNUNET_MESH_Handle *handle = cls;
 205
 206   /* Send a hello to this peer */
 207   GNUNET_CORE_notify_transmit_ready(handle->core,
 208                                     GNUNET_NO,
 209                                     42,
 210                                     GNUNET_TIME_UNIT_SECONDS,
 211                                     peer,
 212                                     sizeof(struct GNUNET_MessageHeader) + handle->hello_message_size,
 213                                     &send_hello_message,
 214                                     cls);
 215
 216   /* put the new peer into the list of connected peers */
 217   struct peer_list_element *element =
 218     GNUNET_malloc (sizeof (struct peer_list_element));
 219   memcpy (&element->peer, peer, sizeof (struct GNUNET_PeerIdentity));
 220
 221   if (NULL != atsi)
 222     memcpy (&element->atsi, atsi,
 223             sizeof (struct GNUNET_TRANSPORT_ATS_Information));
 224
 225   GNUNET_CONTAINER_DLL_insert_after (handle->connected_peers.head,
 226                                      handle->connected_peers.tail,
 227                                      handle->connected_peers.tail, element);
 228
 229   struct tunnel_list_element *tunnel = handle->pending_tunnels.head;
 230   while (tunnel != NULL)
 231     {
 232       if (0 ==
 233           memcmp (&tunnel->tunnel.peer, peer,
 234                   sizeof (struct GNUNET_PeerIdentity)))
 235         {
 236           struct tunnel_list_element *next = tunnel->next;
 237           GNUNET_CONTAINER_DLL_remove (handle->pending_tunnels.head,
 238                                        handle->pending_tunnels.tail, tunnel);
 239           GNUNET_CONTAINER_DLL_insert_after (handle->established_tunnels.head,
 240                                              handle->established_tunnels.tail,
 241                                              handle->established_tunnels.tail,
 242                                              tunnel);
 243           tunnel->tunnel.connect_handler (tunnel->tunnel.handler_cls,
 244                                           peer, atsi);
 245           GNUNET_SCHEDULER_add_now(send_end_connect, tunnel);
 246           tunnel = next;
 247         }
 248       else
 249         tunnel = tunnel->next;
 250     }
 251 }
 252
 253 /**
 254  * Core calls this if we disconnect a peer
 255  *
 256  * Remove this peer from the list of connected peers
 257  * Close all tunnels this peer belongs to
 258  */
 259 static void
 260 core_disconnect (void *cls, const struct GNUNET_PeerIdentity *peer)
 261 {
 262   struct GNUNET_MESH_Handle *handle = cls;
 263
 264   struct peer_list_element *element = handle->connected_peers.head;
 265   while (element != NULL)
 266     {
 267       if (0 ==
 268           memcmp (&element->peer, peer, sizeof (struct GNUNET_PeerIdentity)))
 269         break;
 270       element = element->next;
 271     }
 272   if (element != NULL)
 273     {
 274       GNUNET_CONTAINER_DLL_remove (handle->connected_peers.head,
 275                                    handle->connected_peers.tail, element);
 276       GNUNET_free_non_null(element->types);
 277       GNUNET_free (element);
 278     }
 279
 280   struct tunnel_list_element *telement = handle->established_tunnels.head;
 281   while (telement != NULL)
 282     {
 283       if (0 ==
 284           memcmp (&telement->tunnel.peer, peer,
 285                   sizeof (struct GNUNET_PeerIdentity)))
 286         {
 287           /* disconnect tunnels */
 288           /* outbound tunnels */
 289           if (telement->tunnel.connect_handler != NULL && NULL != telement->tunnel.disconnect_handler)
 290             telement->tunnel.disconnect_handler (telement->tunnel.handler_cls,
 291                                                  peer);
 292           /* inbound tunnels */
 293           else if (NULL != handle->cleaner)
 294             handle->cleaner (handle->cls, &telement->tunnel,
 295                              &telement->tunnel.ctx);
 296
 297           struct tunnel_list_element *next = telement->next;
 298           GNUNET_CONTAINER_DLL_remove (handle->established_tunnels.head,
 299                                        handle->established_tunnels.tail,
 300                                        telement);
 301           GNUNET_free (telement);
 302           telement = next;
 303         }
 304       else
 305         {
 306           telement = telement->next;
 307         }
 308     }
 309 }
 310
 311 /**
 312  * Receive a message from core.
 313  * This is a hello-message, containing the application-types the other peer can receive
 314  */
 315 static int
 316 receive_hello (void *cls,
 317                const struct GNUNET_PeerIdentity *other,
 318                const struct GNUNET_MessageHeader *message,
 319                const struct GNUNET_TRANSPORT_ATS_Information *atsi)
 320 {
 321   struct GNUNET_MESH_Handle *handle = cls;
 322   uint16_t *num = (uint16_t *) (message + 1);
 323   uint16_t *ports = num + 1;
 324   unsigned int i;
 325
 326   struct peer_list_element *element = handle->connected_peers.head;
 327   while (element != NULL)
 328     {
 329       if (0 ==
 330           memcmp (&element->peer, other, sizeof (struct GNUNET_PeerIdentity)))
 331         break;
 332       element = element->next;
 333     }
 334
 335   /* TODO: add, not replace! */
 336   element->num_types = *num;
 337   element->types = GNUNET_malloc (*num * sizeof (GNUNET_MESH_ApplicationType));
 338
 339   for (i = 0; i < *num; i++)
 340     element->types[i] = (GNUNET_MESH_ApplicationType)ntohs (ports[i]);
 341
 342   struct tunnel_list_element *tunnel = handle->pending_by_type_tunnels.head;
 343   while (tunnel != NULL)
 344     {
 345       struct tunnel_list_element *next = tunnel->next;
 346       for (i = 0; i < *num; i++)
 347         {
 348           if (ntohs (ports[i]) == tunnel->tunnel.application_type)
 349             {
 350               GNUNET_CONTAINER_DLL_remove (handle->pending_tunnels.head,
 351                                            handle->pending_tunnels.tail,
 352                                            tunnel);
 353               GNUNET_CONTAINER_DLL_insert_after (handle->established_tunnels.
 354                                                  head,
 355                                                  handle->established_tunnels.
 356                                                  tail,
 357                                                  handle->established_tunnels.
 358                                                  tail, tunnel);
 359               tunnel->tunnel.connect_handler (tunnel->tunnel.handler_cls,
 360                                               &tunnel->tunnel.peer, atsi);
 361               GNUNET_SCHEDULER_add_now (send_end_connect, tunnel);
 362               break;
 363             }
 364         }
 365       if (ntohs (ports[i]) == tunnel->tunnel.application_type)
 366         tunnel = next;
 367       else
 368         tunnel = tunnel->next;
 369     }
 370   return GNUNET_OK;
 371 }
 372
 373 /**
 374  * Receive a message from core.
 375  */
 376 static int
 377 core_receive (void *cls,
 378               const struct GNUNET_PeerIdentity *other,
 379               const struct GNUNET_MessageHeader *message,
 380               const struct GNUNET_TRANSPORT_ATS_Information *atsi)
 381 {
 382   struct GNUNET_MESH_Handle *handle = cls;
 383   struct tunnel_message *tmessage = (struct tunnel_message *) message;
 384   struct GNUNET_MessageHeader *rmessage =
 385     (struct GNUNET_MessageHeader *) (tmessage + 1);
 386
 387   struct GNUNET_MESH_MessageHandler *handler;
 388
 389   for (handler = handle->handlers; handler->callback != NULL; handler++)
 390     {
 391       if ( (ntohs (rmessage->type) == handler->type)
 392            && ( (handler->expected_size == 0)
 393                 || (handler->expected_size == ntohs (rmessage->size))) )
 394         {
 395           break;
 396         }
 397     }
 398
 399   /* handler->callback handles this message */
 400
 401   /* If no handler was found, drop the message but keep the channel open */
 402   if (handler->callback == NULL)
 403     return GNUNET_OK;
 404
 405   struct tunnel_list_element *tunnel = handle->established_tunnels.head;
 406
 407   while (tunnel != NULL)
 408     {
 409       if (tunnel->tunnel.id.id == tmessage->id.id &&
 410           (0 ==
 411            memcmp (&tmessage->id.initiator, &tunnel->tunnel.id.initiator,
 412                    sizeof (struct GNUNET_PeerIdentity)))
 413           && (0 ==
 414               memcmp (&tmessage->id.target, &tunnel->tunnel.id.target,
 415                       sizeof (struct GNUNET_PeerIdentity))))
 416         break;
 417       tunnel = tunnel->next;
 418     }
 419
 420   /* if no tunnel was found: create a new inbound tunnel */
 421   if (tunnel == NULL)
 422     {
 423       tunnel = GNUNET_malloc (sizeof (struct tunnel_list_element));
 424       tunnel->tunnel.connect_handler = NULL;
 425       tunnel->tunnel.disconnect_handler = NULL;
 426       tunnel->tunnel.handler_cls = NULL;
 427       tunnel->tunnel.ctx = NULL;
 428       tunnel->tunnel.handle = handle;
 429       memcpy (&tunnel->tunnel.peer, other,
 430               sizeof (struct GNUNET_PeerIdentity));
 431       memcpy (&tunnel->tunnel.id, &tmessage->id, sizeof (struct tunnel_id));
 432
 433       GNUNET_CONTAINER_DLL_insert_after (handle->established_tunnels.head,
 434                                          handle->established_tunnels.tail,
 435                                          handle->established_tunnels.tail,
 436                                          tunnel);
 437     }
 438
 439   return handler->callback (handle->cls, &tunnel->tunnel,
 440                             &tunnel->tunnel.ctx, other, rmessage, atsi);
 441 }
 442
 443 struct GNUNET_MESH_Tunnel *
 444 GNUNET_MESH_peer_request_connect_by_type (struct GNUNET_MESH_Handle *handle,
 445                                           struct GNUNET_TIME_Relative timeout,
 446                                           GNUNET_MESH_ApplicationType application_type,
 447                                           GNUNET_MESH_TunnelConnectHandler
 448                                           connect_handler,
 449                                           GNUNET_MESH_TunnelDisconnectHandler
 450                                           disconnect_handler,
 451                                           void *handler_cls)
 452 {
 453   /* Look in the list of connected peers */
 454   struct peer_list_element *element = handle->connected_peers.head;
 455   while (element != NULL)
 456     {
 457       unsigned int i;
 458       for (i = 0; i < element->num_types; i++)
 459         if (application_type == element->types[i])
 460           return GNUNET_MESH_peer_request_connect_all (handle, timeout, 1,
 461                                                        &handle->myself,
 462                                                        connect_handler,
 463                                                        disconnect_handler,
 464                                                        handler_cls);
 465       element = element->next;
 466     }
 467
 468   /* Put into pending list */
 469   struct tunnel_list_element *tunnel =
 470     GNUNET_malloc (sizeof (struct tunnel_list_element));
 471
 472   tunnel->tunnel.connect_handler = connect_handler;
 473   tunnel->tunnel.disconnect_handler = disconnect_handler;
 474   tunnel->tunnel.handler_cls = handler_cls;
 475   tunnel->tunnel.ctx = NULL;
 476   tunnel->tunnel.handle = handle;
 477   memcpy (&tunnel->tunnel.id.initiator, &handle->myself,
 478           sizeof (struct GNUNET_PeerIdentity));
 479   tunnel->tunnel.id.id = current_id++;
 480   tunnel->tunnel.application_type = application_type;
 481
 482   GNUNET_CONTAINER_DLL_insert_after (handle->pending_by_type_tunnels.head,
 483                                      handle->pending_by_type_tunnels.tail,
 484                                      handle->pending_by_type_tunnels.tail,
 485                                      tunnel);
 486   return &tunnel->tunnel;
 487 }
 488
 489
 490
 491 struct GNUNET_MESH_Tunnel *
 492 GNUNET_MESH_peer_request_connect_all (struct GNUNET_MESH_Handle *handle,
 493                                       struct GNUNET_TIME_Relative timeout,
 494                                       unsigned int num_peers,
 495                                       const struct GNUNET_PeerIdentity *peers,
 496                                       GNUNET_MESH_TunnelConnectHandler
 497                                       connect_handler,
 498                                       GNUNET_MESH_TunnelDisconnectHandler
 499                                       disconnect_handler, void *handler_cls)
 500 {
 501   if (num_peers != 1)
 502     return NULL;
 503
 504   struct tunnel_list_element *tunnel =
 505     GNUNET_malloc (sizeof (struct tunnel_list_element));
 506
 507   tunnel->tunnel.connect_handler = connect_handler;
 508   tunnel->tunnel.disconnect_handler = disconnect_handler;
 509   tunnel->tunnel.handler_cls = handler_cls;
 510   tunnel->tunnel.ctx = NULL;
 511   tunnel->tunnel.handle = handle;
 512   memcpy (&tunnel->tunnel.id.initiator, &handle->myself,
 513           sizeof (struct GNUNET_PeerIdentity));
 514   memcpy (&tunnel->tunnel.id.target, peers,
 515           sizeof (struct GNUNET_PeerIdentity));
 516   tunnel->tunnel.id.id = current_id++;
 517   memcpy (&tunnel->tunnel.peer, peers, sizeof(struct GNUNET_PeerIdentity));
 518
 519   struct peer_list_element *element = handle->connected_peers.head;
 520   while (element != NULL)
 521     {
 522       if (0 ==
 523           memcmp (&element->peer, peers, sizeof (struct GNUNET_PeerIdentity)))
 524         break;
 525       element = element->next;
 526     }
 527
 528   if (element != NULL)
 529     {
 530       /* we are connected to this peer */
 531       GNUNET_CONTAINER_DLL_insert_after (handle->established_tunnels.head,
 532                                          handle->established_tunnels.tail,
 533                                          handle->established_tunnels.tail,
 534                                          tunnel);
 535       GNUNET_SCHEDULER_add_now(call_connect_handler, tunnel);
 536     }
 537   else if (0 ==
 538            memcmp (peers, &handle->myself,
 539                    sizeof (struct GNUNET_PeerIdentity)))
 540     {
 541       /* we are the peer */
 542       GNUNET_CONTAINER_DLL_insert_after (handle->established_tunnels.head,
 543                                          handle->established_tunnels.tail,
 544                                          handle->established_tunnels.tail,
 545                                          tunnel);
 546       GNUNET_SCHEDULER_add_now(send_self_connect, tunnel);
 547     }
 548   else
 549     {
 550       /* we are not connected to this peer */
 551       GNUNET_CONTAINER_DLL_insert_after (handle->pending_tunnels.head,
 552                                          handle->pending_tunnels.tail,
 553                                          handle->pending_tunnels.tail,
 554                                          tunnel);
 555       (void) GNUNET_CORE_peer_request_connect (handle->core,
 556                                                peers,
 557                                                NULL, NULL);
 558     }
 559
 560   return &tunnel->tunnel;
 561 }
 562
 563 const struct GNUNET_PeerIdentity*
 564 GNUNET_MESH_get_peer(const struct GNUNET_MESH_Tunnel* tunnel)
 565 {
 566   return &tunnel->peer;
 567 }
 568
 569 static size_t
 570 core_notify(void* cls, size_t size, void* buf)
 571 {
 572   struct notify_cls *ncls = cls;
 573   struct GNUNET_MESH_Tunnel *tunnel = ncls->tunnel;
 574   struct tunnel_message* message = buf;
 575   void* cbuf = (void*) &message[1];
 576   GNUNET_assert(NULL != ncls->notify);
 577
 578   size_t sent = ncls->notify(ncls->notify_cls, size - sizeof(struct tunnel_message), cbuf);
 579
 580   GNUNET_free(ncls);
 581
 582   if (0 == sent) return 0;
 583
 584   sent += sizeof(struct tunnel_message);
 585
 586   message->hdr.type = htons(GNUNET_MESSAGE_TYPE_MESH);
 587   message->hdr.size = htons(sent);
 588   memcpy(&message->id, &tunnel->id, sizeof(struct tunnel_id));
 589   return sent;
 590 }
 591
 592
 593 /**
 594  * Ask the mesh to call "notify" once it is ready to transmit the
 595  * given number of bytes to the specified "target".  If we are not yet
 596  * connected to the specified peer, a call to this function will cause
 597  * us to try to establish a connection.
 598  *
 599  * @param tunnel tunnel to use for transmission
 600  * @param cork is corking allowed for this transmission?
 601  * @param priority how important is the message?
 602  * @param maxdelay how long can the message wait?
 603  * @param target destination for the message, NULL for multicast to all tunnel targets
 604  * @param notify_size how many bytes of buffer space does notify want?
 605  * @param notify function to call when buffer space is available;
 606  *        will be called with NULL on timeout or if the overall queue
 607  *        for this peer is larger than queue_size and this is currently
 608  *        the message with the lowest priority
 609  * @param notify_cls closure for notify
 610  * @return non-NULL if the notify callback was queued,
 611  *         NULL if we can not even queue the request (insufficient
 612  *         memory); if NULL is returned, "notify" will NOT be called.
 613  */
 614 struct GNUNET_MESH_TransmitHandle *
 615 GNUNET_MESH_notify_transmit_ready (struct
 616                                    GNUNET_MESH_Tunnel
 617                                    *tunnel,
 618                                    int cork,
 619                                    uint32_t priority,
 620                                    struct
 621                                    GNUNET_TIME_Relative
 622                                    maxdelay,
 623                                    const struct GNUNET_PeerIdentity *target,
 624                                    size_t
 625                                    notify_size,
 626                                    GNUNET_CONNECTION_TransmitReadyNotify
 627                                    notify, void *notify_cls)
 628 {
 629   struct notify_cls *cls = GNUNET_malloc(sizeof(struct notify_cls));
 630   cls->notify_cls = notify_cls;
 631   GNUNET_assert(NULL != notify);
 632   cls->notify = notify;
 633   cls->tunnel = tunnel;
 634   GNUNET_CORE_notify_transmit_ready(tunnel->handle->core,
 635                                     cork,
 636                                     priority,
 637                                     maxdelay,
 638                                     &tunnel->peer,
 639                                     notify_size + sizeof(struct tunnel_message),
 640                                     &core_notify,
 641                                     (void*)cls);
 642
 643   /* aborting is not implemented yet */
 644   return (struct GNUNET_MESH_TransmitHandle*) 1;
 645 }
 646
 647 void build_hello_message(struct GNUNET_MESH_Handle* handle,
 648                          const GNUNET_MESH_ApplicationType *stypes)
 649 {
 650   int num = 0;
 651   const GNUNET_MESH_ApplicationType *t;
 652
 653   for (t = stypes; *t != GNUNET_APPLICATION_TYPE_END; t++, num++);
 654
 655   handle->hello_message_size = sizeof(uint16_t) + /* For the number of types */
 656     num * sizeof(GNUNET_MESH_ApplicationType); /* For the types */
 657
 658   uint16_t *nums = GNUNET_malloc(handle->hello_message_size);
 659   GNUNET_MESH_ApplicationType *types = (GNUNET_MESH_ApplicationType*)(nums + 1);
 660
 661   *nums = num;
 662   memcpy(types, stypes, num*sizeof(GNUNET_MESH_ApplicationType));
 663
 664   handle->hello_message = nums;
 665 }
 666
 667
 668 struct GNUNET_MESH_Handle *
 669 GNUNET_MESH_connect (const struct
 670                      GNUNET_CONFIGURATION_Handle
 671                      *cfg, void *cls,
 672                      GNUNET_MESH_TunnelEndHandler
 673                      cleaner,
 674                      const struct GNUNET_MESH_MessageHandler *handlers,
 675                      const GNUNET_MESH_ApplicationType *stypes)
 676 {
 677   struct GNUNET_MESH_Handle *ret =
 678     GNUNET_malloc (sizeof (struct GNUNET_MESH_Handle));
 679
 680   ret->connected_to_core = GNUNET_NO;
 681   ret->connected_peers.head = NULL;
 682   ret->connected_peers.tail = NULL;
 683   ret->cleaner = cleaner;
 684   ret->cls = cls;
 685
 686   const struct GNUNET_MESH_MessageHandler *it;
 687   unsigned int len = 1;
 688   for (it = handlers; it->callback != NULL; it++)
 689     {
 690       len++;
 691     }
 692
 693   ret->handlers =
 694     GNUNET_malloc (len * sizeof (struct GNUNET_MESH_MessageHandler));
 695   memset(ret->handlers, 0, len * sizeof(struct GNUNET_MESH_MessageHandler));
 696   memcpy (ret->handlers, handlers,
 697           len * sizeof (struct GNUNET_MESH_MessageHandler));
 698
 699   build_hello_message(ret, stypes);
 700
 701   static const struct GNUNET_CORE_MessageHandler core_handlers[] = {
 702     {&core_receive, GNUNET_MESSAGE_TYPE_MESH, 0},
 703     {&receive_hello, GNUNET_MESSAGE_TYPE_MESH_HELLO, 0},
 704     {NULL, 0, 0}
 705   };
 706
 707   ret->core = GNUNET_CORE_connect (cfg,
 708                                    42,
 709                                    ret,
 710                                    &core_startup,
 711                                    &core_connect,
 712                                    &core_disconnect,
 713                                    NULL,
 714                                    NULL,
 715                                    GNUNET_NO, NULL, GNUNET_NO, core_handlers);
 716   return ret;
 717 }
 718
 719 void
 720 GNUNET_MESH_disconnect (struct GNUNET_MESH_Handle *handle)
 721 {
 722   GNUNET_free (handle->handlers);
 723   GNUNET_free (handle->hello_message);
 724   GNUNET_CORE_disconnect (handle->core);
 725
 726   struct peer_list_element *element = handle->connected_peers.head;
 727   while (element != NULL)
 728     {
 729       struct peer_list_element *next = element->next;
 730       GNUNET_free_non_null(element->types);
 731       GNUNET_free (element);
 732       element = next;
 733     }
 734
 735   struct tunnel_list_element *tunnel = handle->pending_tunnels.head;
 736   while (tunnel != NULL)
 737     {
 738       struct tunnel_list_element *next = tunnel->next;
 739       GNUNET_free (tunnel);
 740       tunnel = next;
 741     }
 742   tunnel = handle->established_tunnels.head;;
 743   while (tunnel != NULL)
 744     {
 745       struct tunnel_list_element *next = tunnel->next;
 746       GNUNET_free (tunnel);
 747       tunnel = next;
 748     }
 749
 750   GNUNET_free (handle);
 751 }
 752
 753 /* end of mesh_api.c */