src/mesh/mesh_api_new.c

   1 /*
   2      This file is part of GNUnet.
   3      (C) 2011 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_new.c
  23  * @brief mesh api: client implementation of mesh service
  24  * @author Bartlomiej Polot
  25  *
  26  * STRUCTURE:
  27  * - CONSTANTS
  28  * - DATA STRUCTURES
  29  * - SEND CALLBACKS
  30  * - RECEIVE HANDLERS
  31  * - API CALL DEFINITIONS
  32  */
  33
  34 #ifdef __cplusplus
  35
  36 extern "C"
  37 {
  38 #if 0                           /* keep Emacsens' auto-indent happy */
  39 }
  40 #endif
  41 #endif
  42
  43
  44 #include "platform.h"
  45 #include "gnunet_common.h"
  46 #include "gnunet_client_lib.h"
  47 #include "gnunet_util_lib.h"
  48 #include "gnunet_peer_lib.h"
  49 #include "gnunet_mesh_service_new.h"
  50 #include "mesh.h"
  51 #include "mesh_protocol.h"
  52
  53 /******************************************************************************/
  54 /************************      DATA STRUCTURES     ****************************/
  55 /******************************************************************************/
  56
  57 /**
  58  * Opaque handle to the service.
  59  */
  60 struct GNUNET_MESH_Handle {
  61     /**
  62      * Handle to the server connection, to send messages later
  63      */
  64     struct GNUNET_CLIENT_Connection             *client;
  65
  66     /**
  67      * Set of handlers used for processing incoming messages in the tunnels
  68      */
  69     const struct GNUNET_MESH_MessageHandler     *message_handlers;
  70     int                                         n_handlers;
  71
  72     /**
  73      * Set of applications that should be claimed to be offered at this node.
  74      * Note that this is just informative, the appropiate handlers must be
  75      * registered independently and the mapping is up to the developer of the
  76      * client application.
  77      */
  78     const GNUNET_MESH_ApplicationType           *applications;
  79     int                                         n_applications;
  80
  81     /**
  82      * Double linked list of the tunnels this client is connected to.
  83      */
  84     struct GNUNET_MESH_Tunnel                   *tunnels_head;
  85     struct GNUNET_MESH_Tunnel                   *tunnels_tail;
  86
  87     /**
  88      * tid of the next tunnel to create (to avoid reusing IDs often)
  89      */
  90     MESH_TunnelNumber                               next_tid;
  91
  92     /**
  93      * Callback for tunnel disconnection
  94      */
  95     GNUNET_MESH_TunnelEndHandler                *cleaner;
  96
  97     /**
  98      * Handle to cancel pending transmissions in case of disconnection
  99      */
 100     struct GNUNET_CLIENT_TransmitHandle         *th;
 101
 102     /**
 103      * Closure for all the handlers given by the client
 104      */
 105     void                                        *cls;
 106 };
 107
 108 /**
 109  * Opaque handle to a tunnel.
 110  */
 111 struct GNUNET_MESH_Tunnel {
 112
 113     /**
 114      * DLL
 115      */
 116     struct GNUNET_MESH_Tunnel                   *next;
 117     struct GNUNET_MESH_Tunnel                   *prev;
 118
 119     /**
 120      * Local ID of the tunnel
 121      */
 122     MESH_TunnelNumber                           tid;
 123
 124     /**
 125      * Owner of the tunnel
 126      */
 127     GNUNET_PEER_Id                              owner;
 128
 129     /**
 130      * Callback to execute when peers connect to the tunnel
 131      */
 132     GNUNET_MESH_TunnelConnectHandler            connect_handler;
 133
 134     /**
 135      * Callback to execute when peers disconnect to the tunnel
 136      */
 137     GNUNET_MESH_TunnelDisconnectHandler         disconnect_handler;
 138
 139     /**
 140      * All peers added to the tunnel
 141      */
 142     GNUNET_PEER_Id                              *peers;
 143
 144     /**
 145      * Closure for the connect/disconnect handlers
 146      */
 147     void                                        *cls;
 148
 149     /**
 150      * Handle to the mesh this tunnel belongs to
 151      */
 152     struct GNUNET_MESH_Handle                   *mesh;
 153 };
 154
 155 struct GNUNET_MESH_TransmitHandle {
 156     // TODO
 157 };
 158
 159 /******************************************************************************/
 160 /***********************     AUXILIARY FUNCTIONS      *************************/
 161 /******************************************************************************/
 162
 163 /**
 164  * Get the tunnel handler for the tunnel specified by id from the given handle
 165  * @param h Mesh handle
 166  * @param tid ID of the wanted tunnel
 167  * @return handle to the required tunnel or NULL if not found
 168  */
 169 static struct GNUNET_MESH_Tunnel *
 170 retrieve_tunnel (struct GNUNET_MESH_Handle *h, MESH_TunnelNumber tid)
 171 {
 172     struct GNUNET_MESH_Tunnel           *t;
 173
 174     t = h->tunnels_head;
 175     while (t != NULL) {
 176         if (t->tid == tid) return t;
 177         t = t->next;
 178     }
 179     return NULL;
 180 }
 181
 182
 183 /******************************************************************************/
 184 /************************       SEND CALLBACKS     ****************************/
 185 /******************************************************************************/
 186
 187
 188 /**
 189  * Function called to send a connect message to the service, specifying the
 190  * types and applications that the client is interested in.
 191  * "buf" will be NULL and "size" zero if the socket was closed for writing in
 192  * the meantime.
 193  *
 194  * @param cls closure, the mesh handle
 195  * @param size number of bytes available in buf
 196  * @param buf where the callee should write the connect message
 197  * @return number of bytes written to buf
 198  */
 199 static size_t
 200 send_connect_packet (void *cls, size_t size, void *buf)
 201 {
 202     struct GNUNET_MESH_Handle           *h = cls;
 203     struct GNUNET_MESH_ClientConnect    *msg;
 204     uint16_t                            *types;
 205     uint16_t                            ntypes;
 206     GNUNET_MESH_ApplicationType         *apps;
 207     uint16_t                            napps;
 208
 209     h->th = NULL;
 210     if (0 == size || buf == NULL) {
 211         GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
 212                     "Send connect packet: buffer size 0 or buffer invalid\n");
 213         // FIXME: disconnect, reconnect, retry!
 214         return 0;
 215     }
 216     if (sizeof(struct GNUNET_MessageHeader) > size) {
 217         GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
 218                     "Send connect packet: buffer size too small\n");
 219         // FIXME: disconnect, reconnect, retry!
 220         return 0;
 221     }
 222     GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
 223                 "Send connect packet: %lu bytes buffer\n",
 224                 size);
 225     msg = (struct GNUNET_MESH_ClientConnect *) buf;
 226     msg->header.type = htons(GNUNET_MESSAGE_TYPE_MESH_LOCAL_CONNECT);
 227
 228     for (ntypes = 0, types = NULL; ntypes < h->n_handlers; ntypes++) {
 229         types = GNUNET_realloc(types, sizeof(uint16_t) * (ntypes + 1));
 230         types[ntypes] = h->message_handlers[ntypes].type;
 231     }
 232
 233     for(napps = 0, apps = NULL; napps < h->n_applications; napps++) {
 234         apps = GNUNET_realloc(apps,
 235                               sizeof(GNUNET_MESH_ApplicationType) *
 236                                 (napps + 1));
 237         apps[napps] = h->applications[napps];
 238     }
 239
 240     msg->header.size = htons(sizeof(struct GNUNET_MESH_ClientConnect) +
 241                              sizeof(uint16_t) * ntypes +
 242                              sizeof(GNUNET_MESH_ApplicationType) * napps);
 243
 244     memcpy(&msg[1], types, sizeof(uint16_t) * ntypes);
 245     memcpy(&msg[1] + sizeof(uint16_t) * ntypes,
 246            apps,
 247            sizeof(GNUNET_MESH_ApplicationType) * napps);
 248     GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
 249                 "Sent %lu bytes long message %d types and %d apps\n",
 250                 ntohs(msg->header.size),
 251                 ntypes,
 252                 napps
 253                );
 254     msg->applications = htons(napps);
 255     msg->types = htons(ntypes);
 256
 257     return ntohs(msg->header.size);
 258 }
 259
 260
 261 /**
 262  * Function called to send a create tunnel message, specifying the tunnel
 263  * number chosen by the client.
 264  * "buf" will be NULL and "size" zero if the socket was closed for
 265  * writing in the meantime.
 266  *
 267  * @param cls closure, the tunnel handle
 268  * @param size number of bytes available in buf
 269  * @param buf where the callee should write the create tunnel message
 270  * @return number of bytes written to buf
 271  */
 272 static size_t
 273 send_tunnel_create_packet (void *cls, size_t size, void *buf)
 274 {
 275     struct GNUNET_MESH_Tunnel           *t = cls;
 276     struct GNUNET_MESH_Handle           *h;
 277     struct GNUNET_MESH_TunnelMessage    *msg;
 278
 279     h = t->mesh;
 280     h->th = NULL;
 281     if (0 == size || buf == NULL) {
 282         GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
 283                     "Send connect packet: buffer size 0 or buffer invalid\n");
 284         // FIXME: disconnect, reconnect, retry!
 285         return 0;
 286     }
 287     if (sizeof(struct GNUNET_MessageHeader) > size) {
 288         GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
 289                     "Send connect packet: buffer size too small\n");
 290         // FIXME: disconnect, reconnect, retry!
 291         return 0;
 292     }
 293     GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
 294                 "Send connect packet: %lu bytes buffer\n",
 295                 size);
 296     msg = (struct GNUNET_MESH_TunnelMessage *) buf;
 297     msg->header.type = htons(GNUNET_MESSAGE_TYPE_MESH_LOCAL_CONNECT);
 298
 299     msg->header.size = htons(sizeof(struct GNUNET_MESH_TunnelMessage));
 300     msg->tunnel_id = htonl(t->tid);
 301
 302     GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
 303                 "Sent %lu bytes long message\n",
 304                 ntohs(msg->header.size));
 305
 306     return ntohs(msg->header.size);
 307 }
 308
 309
 310 /******************************************************************************/
 311 /***********************      RECEIVE HANDLERS     ****************************/
 312 /******************************************************************************/
 313
 314 /**
 315  * Process the new tunnel notification and add it to the tunnels in the handle
 316  *
 317  * @param h     The mesh handle
 318  * @param msg   A message with the details of the new incoming tunnel
 319  */
 320 static void
 321 process_tunnel_create(struct GNUNET_MESH_Handle *h,
 322                       const struct GNUNET_MESH_TunnelMessage *msg)
 323 {
 324     struct GNUNET_MESH_Tunnel                   *t;
 325     MESH_TunnelNumber                               tid;
 326
 327     tid = ntohl(msg->tunnel_id);
 328     if (tid >= GNUNET_MESH_LOCAL_TUNNEL_ID_MARK) {
 329         GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
 330             "MESH: received an incoming tunnel with tid in local range (%X)\n",
 331             tid);
 332         GNUNET_break_op(0);
 333         return; //FIXME abort? reconnect?
 334     }
 335     t = GNUNET_malloc(sizeof(struct GNUNET_MESH_Tunnel));
 336     t->cls = h->cls;
 337     t->connect_handler = NULL;
 338     t->disconnect_handler = NULL;
 339     t->mesh = h;
 340     t->tid = tid;
 341
 342     return;
 343 }
 344
 345
 346 /**
 347  * Process the incoming data packets
 348  *
 349  * @param h     The mesh handle
 350  * @param msh   A message encapsulating the data
 351  */
 352 static void
 353 process_incoming_data(struct GNUNET_MESH_Handle *h,
 354                       const struct GNUNET_MessageHeader *message)
 355 {
 356     const struct GNUNET_MessageHeader           *payload;
 357     const struct GNUNET_MESH_MessageHandler     *handler;
 358     struct GNUNET_MESH_Unicast                  *ucast;
 359     struct GNUNET_MESH_Tunnel                   *t;
 360     uint16_t                                    type;
 361     int                                         i;
 362
 363     type = ntohs(message->type);
 364     switch (type) {
 365         case GNUNET_MESSAGE_TYPE_MESH_UNICAST:
 366             ucast = message;
 367             t = retrieve_tunnel(h, ntohl(ucast->tid));
 368
 369     }
 370     for (i = 0; i < h->n_handlers; i++) {
 371         handler = &h->message_handlers[i];
 372         if (handler->type == type) {
 373             /* FIXME */
 374             if (GNUNET_OK == handler->callback (h->cls,
 375                                                 t,
 376                                                 NULL,
 377                                                 NULL,
 378                                                 NULL,
 379                                                 NULL))
 380             {
 381                 GNUNET_log(GNUNET_ERROR_TYPE_DEBUG,
 382                             "MESH: callback completed successfully\n");
 383             } else {
 384                 GNUNET_log(GNUNET_ERROR_TYPE_WARNING,
 385                             "MESH: callback caused disconnection\n");
 386                 GNUNET_MESH_disconnect(h);
 387             }
 388         }
 389     }
 390     return;
 391 }
 392
 393
 394 /**
 395  * Function to process all messages received from the service
 396  *
 397  * @param cls closure
 398  * @param msg message received, NULL on timeout or fatal error
 399  */
 400 static void
 401 msg_received (void *cls, const struct GNUNET_MessageHeader * msg)
 402 {
 403     struct GNUNET_MESH_Handle                   *h = cls;
 404
 405     if (msg == NULL) {
 406         GNUNET_break_op(0);
 407         return;
 408     }
 409
 410     switch (ntohs(msg->type)) {
 411         /* Notify of a new incoming tunnel */
 412         case GNUNET_MESSAGE_TYPE_MESH_LOCAL_TUNNEL_CREATE:
 413             process_tunnel_create(h, (struct GNUNET_MESH_TunnelMessage *)msg);
 414             break;
 415         /* Notify of a new peer in the tunnel */
 416         case GNUNET_MESSAGE_TYPE_MESH_LOCAL_PEER_CONNECTED:
 417             break;
 418         /* Notify of a peer leaving the tunnel */
 419         case GNUNET_MESSAGE_TYPE_MESH_LOCAL_PEER_DISCONNECTED:
 420             break;
 421         /* Notify of a new data packet in the tunnel */
 422         case GNUNET_MESSAGE_TYPE_MESH_UNICAST:
 423         case GNUNET_MESSAGE_TYPE_MESH_MULTICAST:
 424         case GNUNET_MESSAGE_TYPE_MESH_TO_ORIGIN:
 425             process_incoming_data(h, msg);
 426             break;
 427         /* We shouldn't get any other packages, log and ignore */
 428         default:
 429             GNUNET_log(GNUNET_ERROR_TYPE_WARNING,
 430                         "MESH: unsolicited message form service (type %d)\n",
 431                         ntohs(msg->type));
 432     }
 433
 434     GNUNET_log(GNUNET_ERROR_TYPE_DEBUG,
 435                "received a message from mesh\n");
 436     GNUNET_CLIENT_receive (h->client,
 437                         &msg_received,
 438                         h,
 439                         GNUNET_TIME_UNIT_FOREVER_REL);
 440     return;
 441 }
 442
 443 /******************************************************************************/
 444 /**********************      API CALL DEFINITIONS     *************************/
 445 /******************************************************************************/
 446
 447 /**
 448  * Connect to the mesh service.
 449  *
 450  * @param cfg configuration to use
 451  * @param cls closure for the various callbacks that follow
 452  *            (including handlers in the handlers array)
 453  * @param cleaner function called when an *inbound* tunnel is destroyed
 454  * @param handlers callbacks for messages we care about, NULL-terminated
 455  *                 note that the mesh is allowed to drop notifications about
 456  *                 inbound messages if the client does not process them fast
 457  *                 enough (for this notification type, a bounded queue is used)
 458  * @param stypes Application Types the client claims to offer
 459  * @return handle to the mesh service
 460  *         NULL on error (in this case, init is never called)
 461  */
 462 struct GNUNET_MESH_Handle *
 463 GNUNET_MESH_connect (const struct GNUNET_CONFIGURATION_Handle *cfg,
 464                      void *cls,
 465                      GNUNET_MESH_TunnelEndHandler cleaner,
 466                      const struct GNUNET_MESH_MessageHandler *handlers,
 467                      const GNUNET_MESH_ApplicationType *stypes)
 468 {
 469     struct GNUNET_MESH_Handle           *h;
 470     size_t                              size;
 471
 472     h = GNUNET_malloc(sizeof(struct GNUNET_MESH_Handle));
 473
 474     h->cleaner = cleaner;
 475     h->client = GNUNET_CLIENT_connect("mesh", cfg);
 476     GNUNET_CLIENT_receive (h->client,
 477                          &msg_received,
 478                          h,
 479                          GNUNET_TIME_UNIT_FOREVER_REL);
 480     if(h->client == NULL) {
 481         GNUNET_free(h);
 482         return NULL;
 483     }
 484
 485     h->cls = cls;
 486     h->message_handlers = handlers;
 487     h->applications = stypes;
 488     h->next_tid = 0x80000000;
 489
 490     for(h->n_handlers = 0; handlers[h->n_handlers].type; h->n_handlers++);
 491     for(h->n_applications = 0; stypes[h->n_applications]; h->n_applications++);
 492
 493     size = sizeof(struct GNUNET_MESH_ClientConnect);
 494     size += h->n_handlers * sizeof(uint16_t);
 495     size += h->n_applications * sizeof(GNUNET_MESH_ApplicationType);
 496
 497     h->th = GNUNET_CLIENT_notify_transmit_ready(h->client,
 498                                                 size,
 499                                                 GNUNET_TIME_UNIT_FOREVER_REL,
 500                                                 GNUNET_YES,
 501                                                 &send_connect_packet,
 502                                                 (void *)h);
 503
 504     return h;
 505 }
 506
 507
 508 /**
 509  * Disconnect from the mesh service.
 510  *
 511  * @param handle connection to mesh to disconnect
 512  */
 513 void
 514 GNUNET_MESH_disconnect (struct GNUNET_MESH_Handle *handle)
 515 {
 516     if (NULL != handle->th) {
 517         GNUNET_CLIENT_notify_transmit_ready_cancel (handle->th);
 518     }
 519     if (NULL != handle->client) {
 520         GNUNET_CLIENT_disconnect (handle->client, GNUNET_NO);
 521     }
 522     GNUNET_free(handle);
 523 }
 524
 525
 526 /**
 527  * Create a new tunnel (we're initiator and will be allowed to add/remove peers
 528  * and to broadcast).
 529  *
 530  * @param h mesh handle
 531  * @param connect_handler function to call when peers are actually connected
 532  * @param disconnect_handler function to call when peers are disconnected
 533  * @param handler_cls closure for connect/disconnect handlers
 534  */
 535 struct GNUNET_MESH_Tunnel *
 536 GNUNET_MESH_tunnel_create (struct GNUNET_MESH_Handle *h,
 537                            GNUNET_MESH_TunnelConnectHandler
 538                            connect_handler,
 539                            GNUNET_MESH_TunnelDisconnectHandler
 540                            disconnect_handler,
 541                            void *handler_cls)
 542 {
 543     struct GNUNET_MESH_Tunnel           *tunnel;
 544
 545     GNUNET_log(GNUNET_ERROR_TYPE_DEBUG,
 546                "MESH: Creating new tunnel\n");
 547     tunnel = GNUNET_malloc(sizeof(struct GNUNET_MESH_Tunnel));
 548
 549     tunnel->connect_handler = connect_handler;
 550     tunnel->disconnect_handler = disconnect_handler;
 551     tunnel->cls = handler_cls;
 552     tunnel->mesh = h;
 553     tunnel->tid = h->next_tid++;
 554     h->next_tid |= GNUNET_MESH_LOCAL_TUNNEL_ID_MARK; // keep in range
 555
 556     h->th = GNUNET_CLIENT_notify_transmit_ready(h->client,
 557                                     sizeof(struct GNUNET_MESH_TunnelMessage),
 558                                     GNUNET_TIME_UNIT_FOREVER_REL,
 559                                     GNUNET_YES,
 560                                     &send_tunnel_create_packet,
 561                                     (void *)tunnel);
 562
 563     return tunnel;
 564 }
 565
 566
 567 /**
 568  * Request that a peer should be added to the tunnel.  The existing
 569  * connect handler will be called ONCE with either success or failure.
 570  *
 571  * @param tunnel handle to existing tunnel
 572  * @param timeout how long to try to establish a connection
 573  * @param peer peer to add
 574  */
 575 void
 576 GNUNET_MESH_peer_request_connect_add (struct GNUNET_MESH_Tunnel *tunnel,
 577                                       struct GNUNET_TIME_Relative timeout,
 578                                       const struct GNUNET_PeerIdentity *peer)
 579 {
 580     static GNUNET_PEER_Id       peer_id;
 581
 582     peer_id = GNUNET_PEER_intern(peer);
 583
 584     /* FIXME ACTUALLY DO STUFF */
 585     tunnel->peers = &peer_id;
 586     tunnel->connect_handler(tunnel->cls, peer, NULL);
 587     return;
 588 }
 589
 590
 591 /**
 592  * Request that a peer should be removed from the tunnel.  The existing
 593  * disconnect handler will be called ONCE if we were connected.
 594  *
 595  * @param tunnel handle to existing tunnel
 596  * @param peer peer to remove
 597  */
 598 void
 599 GNUNET_MESH_peer_request_connect_del (struct GNUNET_MESH_Tunnel *tunnel,
 600                                       const struct GNUNET_PeerIdentity *peer)
 601 {
 602     /* FIXME ACTUALLY DO STUFF */
 603     tunnel->peers = NULL;
 604     tunnel->disconnect_handler(tunnel->cls, peer);
 605     return;
 606 }
 607
 608
 609 /**
 610  * Request that the mesh should try to connect to a peer supporting the given
 611  * message type.
 612  *
 613  * @param tunnel handle to existing tunnel
 614  * @param timeout how long to try to establish a connection
 615  * @param app_type application type that must be supported by the peer (MESH
 616  *                 should discover peer in proximity handling this type)
 617  */
 618 void
 619 GNUNET_MESH_peer_request_connect_by_type (struct GNUNET_MESH_Tunnel *tunnel,
 620                                           struct GNUNET_TIME_Relative timeout,
 621                                           GNUNET_MESH_ApplicationType
 622                                           app_type)
 623 {
 624     return;
 625 }
 626
 627
 628 /**
 629  * Ask the mesh to call "notify" once it is ready to transmit the
 630  * given number of bytes to the specified "target".  If we are not yet
 631  * connected to the specified peer, a call to this function will cause
 632  * us to try to establish a connection.
 633  *
 634  * @param tunnel tunnel to use for transmission
 635  * @param cork is corking allowed for this transmission?
 636  * @param priority how important is the message?
 637  * @param maxdelay how long can the message wait?
 638  * @param target destination for the message,
 639  *               NULL for multicast to all tunnel targets
 640  * @param notify_size how many bytes of buffer space does notify want?
 641  * @param notify function to call when buffer space is available;
 642  *        will be called with NULL on timeout or if the overall queue
 643  *        for this peer is larger than queue_size and this is currently
 644  *        the message with the lowest priority
 645  * @param notify_cls closure for notify
 646  * @return non-NULL if the notify callback was queued,
 647  *         NULL if we can not even queue the request (insufficient
 648  *         memory); if NULL is returned, "notify" will NOT be called.
 649  */
 650 struct GNUNET_MESH_TransmitHandle *
 651 GNUNET_MESH_notify_transmit_ready (struct GNUNET_MESH_Tunnel *tunnel,
 652                                    int cork,
 653                                    uint32_t priority,
 654                                    struct GNUNET_TIME_Relative maxdelay,
 655                                    const struct GNUNET_PeerIdentity *target,
 656                                    size_t notify_size,
 657                                    GNUNET_CONNECTION_TransmitReadyNotify
 658                                    notify,
 659                                    void *notify_cls)
 660 {
 661     struct GNUNET_MESH_TransmitHandle   *handle;
 662
 663     handle = GNUNET_malloc(sizeof(struct GNUNET_MESH_TransmitHandle));
 664
 665     return handle;
 666 }
 667
 668
 669 #if 0                           /* keep Emacsens' auto-indent happy */
 670 {
 671 #endif
 672 #ifdef __cplusplus
 673 }
 674 #endif