src/transport/gnunet-service-transport_neighbours_3way.c

   1 /*
   2      This file is part of GNUnet.
   3      (C) 2010,2011 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 transport/gnunet-service-transport_neighbours.c
  23  * @brief neighbour management
  24  * @author Christian Grothoff
  25  */
  26 #include "platform.h"
  27 #include "gnunet_ats_service.h"
  28 #include "gnunet-service-transport_neighbours.h"
  29 #include "gnunet-service-transport_plugins.h"
  30 #include "gnunet-service-transport_validation.h"
  31 #include "gnunet-service-transport_clients.h"
  32 #include "gnunet-service-transport.h"
  33 #include "gnunet_peerinfo_service.h"
  34 #include "gnunet-service-transport_blacklist.h"
  35 #include "gnunet_constants.h"
  36 #include "transport.h"
  37
  38
  39 /**
  40  * Size of the neighbour hash map.
  41  */
  42 #define NEIGHBOUR_TABLE_SIZE 256
  43
  44 /**
  45  * How often must a peer violate bandwidth quotas before we start
  46  * to simply drop its messages?
  47  */
  48 #define QUOTA_VIOLATION_DROP_THRESHOLD 10
  49
  50 /**
  51  * How often do we send KEEPALIVE messages to each of our neighbours?
  52  * (idle timeout is 5 minutes or 300 seconds, so with 90s interval we
  53  * send 3 keepalives in each interval, so 3 messages would need to be
  54  * lost in a row for a disconnect).
  55  */
  56 #define KEEPALIVE_FREQUENCY GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_SECONDS, 90)
  57
  58
  59 #define ATS_RESPONSE_TIMEOUT GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_SECONDS, 3)
  60
  61 /**
  62  * Entry in neighbours.
  63  */
  64 struct NeighbourMapEntry;
  65
  66 /**
  67  * Message a peer sends to another to indicate its
  68  * preference for communicating via a particular
  69  * session (and the desire to establish a real
  70  * connection).
  71  */
  72 struct SessionConnectMessage
  73 {
  74   /**
  75    * Header of type 'GNUNET_MESSAGE_TYPE_TRANSPORT_SESSION_CONNECT'
  76    */
  77   struct GNUNET_MessageHeader header;
  78
  79   /**
  80    * Always zero.
  81    */
  82   uint32_t reserved GNUNET_PACKED;
  83
  84   /**
  85    * Absolute time at the sender.  Only the most recent connect
  86    * message implies which session is preferred by the sender.
  87    */
  88   struct GNUNET_TIME_AbsoluteNBO timestamp;
  89
  90 };
  91
  92
  93 struct SessionDisconnectMessage
  94 {
  95   /**
  96    * Header of type 'GNUNET_MESSAGE_TYPE_TRANSPORT_SESSION_DISCONNECT'
  97    */
  98   struct GNUNET_MessageHeader header;
  99
 100   /**
 101    * Always zero.
 102    */
 103   uint32_t reserved GNUNET_PACKED;
 104
 105   /**
 106    * Purpose of the signature.  Extends over the timestamp.
 107    * Purpose should be GNUNET_SIGNATURE_PURPOSE_TRANSPORT_DISCONNECT.
 108    */
 109   struct GNUNET_CRYPTO_RsaSignaturePurpose purpose;
 110
 111   /**
 112    * Absolute time at the sender.  Only the most recent connect
 113    * message implies which session is preferred by the sender.
 114    */
 115   struct GNUNET_TIME_AbsoluteNBO timestamp;
 116
 117   /**
 118    * Public key of the sender.
 119    */
 120   struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded public_key;
 121
 122   /**
 123    * Signature of the peer that sends us the disconnect.  Only
 124    * valid if the timestamp is AFTER the timestamp from the
 125    * corresponding 'CONNECT' message.
 126    */
 127   struct GNUNET_CRYPTO_RsaSignature signature;
 128
 129 };
 130
 131
 132 /**
 133  * For each neighbour we keep a list of messages
 134  * that we still want to transmit to the neighbour.
 135  */
 136 struct MessageQueue
 137 {
 138
 139   /**
 140    * This is a doubly linked list.
 141    */
 142   struct MessageQueue *next;
 143
 144   /**
 145    * This is a doubly linked list.
 146    */
 147   struct MessageQueue *prev;
 148
 149   /**
 150    * Once this message is actively being transmitted, which
 151    * neighbour is it associated with?
 152    */
 153   struct NeighbourMapEntry *n;
 154
 155   /**
 156    * Function to call once we're done.
 157    */
 158   GST_NeighbourSendContinuation cont;
 159
 160   /**
 161    * Closure for 'cont'
 162    */
 163   void *cont_cls;
 164
 165   /**
 166    * The message(s) we want to transmit, GNUNET_MessageHeader(s)
 167    * stuck together in memory.  Allocated at the end of this struct.
 168    */
 169   const char *message_buf;
 170
 171   /**
 172    * Size of the message buf
 173    */
 174   size_t message_buf_size;
 175
 176   /**
 177    * At what time should we fail?
 178    */
 179   struct GNUNET_TIME_Absolute timeout;
 180
 181 };
 182
 183 enum State
 184 {
 185     /* fresh peer or completely disconnected */
 186     S_NOT_CONNECTED = 0,
 187     /* sent CONNECT message to other peer, waiting for CONNECT_ACK */
 188     S_CONNECT_SENT = 1,
 189     /* received CONNECT message to other peer, sending CONNECT_ACK */
 190     S_CONNECT_RECV = 4,
 191     /* sent CONNECT_ACK message to other peer, wait for ACK or payload */
 192     S_CONNECT_RECV_ACK_SENT = 8,
 193     /* received ACK or payload */
 194     S_CONNECTED = 16,
 195     /* Disconnect in progress */
 196     S_DISCONNECT = 32
 197 };
 198
 199 /**
 200  * Entry in neighbours.
 201  */
 202 struct NeighbourMapEntry
 203 {
 204
 205   /**
 206    * Head of list of messages we would like to send to this peer;
 207    * must contain at most one message per client.
 208    */
 209   struct MessageQueue *messages_head;
 210
 211   /**
 212    * Tail of list of messages we would like to send to this peer; must
 213    * contain at most one message per client.
 214    */
 215   struct MessageQueue *messages_tail;
 216
 217   /**
 218    * Performance data for the peer.
 219    */
 220   //struct GNUNET_ATS_Information *ats;
 221
 222   /**
 223    * Are we currently trying to send a message? If so, which one?
 224    */
 225   struct MessageQueue *is_active;
 226
 227   /**
 228    * Active session for communicating with the peer.
 229    */
 230   struct Session *session;
 231
 232   /**
 233    * Name of the plugin we currently use.
 234    */
 235   char *plugin_name;
 236
 237   /**
 238    * Address used for communicating with the peer, NULL for inbound connections.
 239    */
 240   void *addr;
 241
 242   /**
 243    * Number of bytes in 'addr'.
 244    */
 245   size_t addrlen;
 246
 247   /**
 248    * Identity of this neighbour.
 249    */
 250   struct GNUNET_PeerIdentity id;
 251
 252   /**
 253    * ID of task scheduled to run when this peer is about to
 254    * time out (will free resources associated with the peer).
 255    */
 256   GNUNET_SCHEDULER_TaskIdentifier timeout_task;
 257
 258   /**
 259    * ID of task scheduled to send keepalives.
 260    */
 261   GNUNET_SCHEDULER_TaskIdentifier keepalive_task;
 262
 263   /**
 264    * ID of task scheduled to run when we should try transmitting
 265    * the head of the message queue.
 266    */
 267   GNUNET_SCHEDULER_TaskIdentifier transmission_task;
 268
 269   /**
 270    * Tracker for inbound bandwidth.
 271    */
 272   struct GNUNET_BANDWIDTH_Tracker in_tracker;
 273
 274   /**
 275    * Inbound bandwidth from ATS, activated when connection is up
 276    */
 277   struct GNUNET_BANDWIDTH_Value32NBO bandwidth_in;
 278
 279   /**
 280    * Inbound bandwidth from ATS, activated when connection is up
 281    */
 282   struct GNUNET_BANDWIDTH_Value32NBO bandwidth_out;
 283
 284   /**
 285    * Timestamp of the 'SESSION_CONNECT' message we got from the other peer
 286    */
 287   struct GNUNET_TIME_Absolute connect_ts;
 288
 289   GNUNET_SCHEDULER_TaskIdentifier ats_suggest;
 290
 291   /**
 292    * How often has the other peer (recently) violated the inbound
 293    * traffic limit?  Incremented by 10 per violation, decremented by 1
 294    * per non-violation (for each time interval).
 295    */
 296   unsigned int quota_violation_count;
 297
 298   /**
 299    * Number of values in 'ats' array.
 300    */
 301   //unsigned int ats_count;
 302
 303
 304   /**
 305    * Do we currently consider this neighbour connected? (as far as
 306    * the connect/disconnect callbacks are concerned)?
 307    */
 308   //int is_connected;
 309
 310   int state;
 311
 312 };
 313
 314
 315 /**
 316  * All known neighbours and their HELLOs.
 317  */
 318 static struct GNUNET_CONTAINER_MultiHashMap *neighbours;
 319
 320 /**
 321  * Closure for connect_notify_cb and disconnect_notify_cb
 322  */
 323 static void *callback_cls;
 324
 325 /**
 326  * Function to call when we connected to a neighbour.
 327  */
 328 static GNUNET_TRANSPORT_NotifyConnect connect_notify_cb;
 329
 330 /**
 331  * Function to call when we disconnected from a neighbour.
 332  */
 333 static GNUNET_TRANSPORT_NotifyDisconnect disconnect_notify_cb;
 334
 335 /**
 336  * counter for connected neighbours
 337  */
 338 static int neighbours_connected;
 339
 340 /**
 341  * Lookup a neighbour entry in the neighbours hash map.
 342  *
 343  * @param pid identity of the peer to look up
 344  * @return the entry, NULL if there is no existing record
 345  */
 346 static struct NeighbourMapEntry *
 347 lookup_neighbour (const struct GNUNET_PeerIdentity *pid)
 348 {
 349   return GNUNET_CONTAINER_multihashmap_get (neighbours, &pid->hashPubKey);
 350 }
 351
 352 #define change_state(n, state, ...) change (n, state, __LINE__)
 353
 354 static int
 355 is_connecting (struct NeighbourMapEntry * n)
 356 {
 357   if ((n->state > S_NOT_CONNECTED) && (n->state < S_CONNECTED))
 358     return GNUNET_YES;
 359   return GNUNET_NO;
 360 }
 361
 362 static int
 363 is_connected (struct NeighbourMapEntry * n)
 364 {
 365   if (n->state == S_CONNECTED)
 366     return GNUNET_YES;
 367   return GNUNET_NO;
 368 }
 369
 370 static int
 371 is_disconnecting (struct NeighbourMapEntry * n)
 372 {
 373   if (n->state == S_DISCONNECT)
 374     return GNUNET_YES;
 375   return GNUNET_NO;
 376 }
 377
 378 static const char *
 379 print_state (int state)
 380 {
 381   switch (state) {
 382     case S_CONNECTED:
 383         return "S_CONNECTED";
 384       break;
 385     case S_CONNECT_RECV:
 386       return "S_CONNECT_RECV";
 387       break;
 388     case S_CONNECT_RECV_ACK_SENT:
 389       return"S_CONNECT_RECV_ACK_SENT";
 390       break;
 391     case S_CONNECT_SENT:
 392       return "S_CONNECT_SENT";
 393       break;
 394     case S_DISCONNECT:
 395       return "S_DISCONNECT";
 396       break;
 397     case S_NOT_CONNECTED:
 398       return "S_NOT_CONNECTED";
 399       break;
 400     default:
 401       GNUNET_break (0);
 402       break;
 403   }
 404   return NULL;
 405 }
 406
 407 static int
 408 change (struct NeighbourMapEntry * n, int state, int line)
 409 {
 410   char * old = strdup(print_state(n->state));
 411   char * new = strdup(print_state(state));
 412
 413   /* allowed transitions */
 414   int allowed = GNUNET_NO;
 415   switch (n->state) {
 416   case S_NOT_CONNECTED:
 417     if ((state == S_CONNECT_RECV) || (state == S_CONNECT_SENT) ||
 418         (state == S_DISCONNECT))
 419     {
 420       allowed = GNUNET_YES;
 421       break;
 422     }
 423     break;
 424   case S_CONNECT_RECV:
 425     if ((state == S_NOT_CONNECTED) || (state == S_DISCONNECT) ||
 426         (state == S_CONNECTED))
 427     {
 428       allowed = GNUNET_YES;
 429       break;
 430     }
 431     break;
 432   case S_CONNECT_SENT:
 433     if ((state == S_NOT_CONNECTED) || (state == S_CONNECTED) ||
 434         (state == S_DISCONNECT) || /* FIXME SENT -> RECV ISSUE!*/ (state == S_CONNECT_RECV))
 435     {
 436       allowed = GNUNET_YES;
 437       break;
 438     }
 439     break;
 440   case S_CONNECTED:
 441     if (state == S_DISCONNECT)
 442     {
 443       allowed = GNUNET_YES;
 444       break;
 445     }
 446     break;
 447   case S_DISCONNECT:
 448     /*
 449     if (state == S_NOT_CONNECTED)
 450     {
 451       allowed = GNUNET_YES;
 452       break;
 453     }*/
 454     break;
 455   default:
 456     GNUNET_break (0);
 457     break;
 458
 459   }
 460
 461   if (allowed == GNUNET_NO)
 462   {
 463     GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
 464         "Illegal state transition from `%s' to `%s' in line %u \n",
 465         old, new, line);
 466     GNUNET_break (0);
 467     GNUNET_free (old);
 468     GNUNET_free (new);
 469     return GNUNET_SYSERR;
 470   }
 471
 472   n->state = state;
 473   GNUNET_log (GNUNET_ERROR_TYPE_ERROR, "State for neighbour `%s' %X changed from `%s' to `%s' in line %u\n",
 474       GNUNET_i2s (&n->id), n, old, new, line);
 475   GNUNET_free (old);
 476   GNUNET_free (new);
 477   return GNUNET_OK;
 478 }
 479
 480 static ssize_t
 481 send_with_plugin ( const struct GNUNET_PeerIdentity * target,
 482     const char *msgbuf,
 483     size_t msgbuf_size,
 484     uint32_t priority,
 485     struct GNUNET_TIME_Relative timeout,
 486     struct Session * session,
 487     const char * plugin_name,
 488     const void *addr,
 489     size_t addrlen,
 490     int force_address,
 491     GNUNET_TRANSPORT_TransmitContinuation cont,
 492     void *cont_cls)
 493
 494 {
 495   struct GNUNET_TRANSPORT_PluginFunctions *papi;
 496   size_t ret = GNUNET_SYSERR;
 497
 498   papi = GST_plugins_find (plugin_name);
 499   if (papi == NULL)
 500   {
 501     if (cont != NULL)
 502       cont (cont_cls, target, GNUNET_SYSERR);
 503     return GNUNET_SYSERR;
 504   }
 505
 506   ret = papi->send (papi->cls,
 507       target,
 508       msgbuf, msgbuf_size,
 509       0,
 510       timeout,
 511       session,
 512       addr, addrlen,
 513       GNUNET_YES,
 514       cont, cont_cls);
 515
 516   if (ret == -1)
 517   {
 518     if (cont != NULL)
 519       cont (cont_cls, target, GNUNET_SYSERR);
 520   }
 521   return ret;
 522 }
 523
 524 /**
 525  * Task invoked to start a transmission to another peer.
 526  *
 527  * @param cls the 'struct NeighbourMapEntry'
 528  * @param tc scheduler context
 529  */
 530 static void
 531 transmission_task (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc);
 532
 533
 534 /**
 535  * We're done with our transmission attempt, continue processing.
 536  *
 537  * @param cls the 'struct MessageQueue' of the message
 538  * @param receiver intended receiver
 539  * @param success whether it worked or not
 540  */
 541 static void
 542 transmit_send_continuation (void *cls,
 543                             const struct GNUNET_PeerIdentity *receiver,
 544                             int success)
 545 {
 546   struct MessageQueue *mq;
 547   struct NeighbourMapEntry *n;
 548
 549   mq = cls;
 550   n = mq->n;
 551   if (NULL != n)
 552   {
 553     GNUNET_assert (n->is_active == mq);
 554     n->is_active = NULL;
 555     if (success == GNUNET_YES)
 556     {
 557       GNUNET_assert (n->transmission_task == GNUNET_SCHEDULER_NO_TASK);
 558       n->transmission_task = GNUNET_SCHEDULER_add_now (&transmission_task, n);
 559     }
 560   }
 561 #if DEBUG_TRANSPORT
 562   GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Sending message of type %u was %s\n",
 563               ntohs (((struct GNUNET_MessageHeader *) mq->message_buf)->type),
 564               (success == GNUNET_OK) ? "successful" : "FAILED");
 565 #endif
 566   if (NULL != mq->cont)
 567     mq->cont (mq->cont_cls, success);
 568   GNUNET_free (mq);
 569 }
 570
 571
 572 /**
 573  * Check the ready list for the given neighbour and if a plugin is
 574  * ready for transmission (and if we have a message), do so!
 575  *
 576  * @param n target peer for which to transmit
 577  */
 578 static void
 579 try_transmission_to_peer (struct NeighbourMapEntry *n)
 580 {
 581   struct MessageQueue *mq;
 582   struct GNUNET_TIME_Relative timeout;
 583   ssize_t ret;
 584
 585   if (n->is_active != NULL)
 586   {
 587     GNUNET_break (0);
 588     return;                     /* transmission already pending */
 589   }
 590   if (n->transmission_task != GNUNET_SCHEDULER_NO_TASK)
 591   {
 592     GNUNET_break (0);
 593     return;                     /* currently waiting for bandwidth */
 594   }
 595   while (NULL != (mq = n->messages_head))
 596   {
 597     timeout = GNUNET_TIME_absolute_get_remaining (mq->timeout);
 598     if (timeout.rel_value > 0)
 599       break;
 600     GNUNET_CONTAINER_DLL_remove (n->messages_head, n->messages_tail, mq);
 601     n->is_active = mq;
 602     mq->n = n;
 603     transmit_send_continuation (mq, &n->id, GNUNET_SYSERR);     /* timeout */
 604   }
 605   if (NULL == mq)
 606     return;                     /* no more messages */
 607
 608   if (GST_plugins_find (n->plugin_name) == NULL)
 609   {
 610     GNUNET_break (0);
 611     return;
 612   }
 613   GNUNET_CONTAINER_DLL_remove (n->messages_head, n->messages_tail, mq);
 614   n->is_active = mq;
 615   mq->n = n;
 616
 617   if  ((n->session == NULL) && (n->addr == NULL) && (n->addrlen == 0))
 618   {
 619     GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "No address for peer `%s'\n",
 620                 GNUNET_i2s (&n->id));
 621     transmit_send_continuation (mq, &n->id, GNUNET_SYSERR);
 622     GNUNET_assert (n->transmission_task == GNUNET_SCHEDULER_NO_TASK);
 623     n->transmission_task = GNUNET_SCHEDULER_add_now (&transmission_task, n);
 624     return;
 625   }
 626
 627   ret = send_with_plugin (&n->id,
 628                           mq->message_buf, mq->message_buf_size, 0,
 629                           timeout,
 630                           n->session, n->plugin_name, n->addr, n->addrlen,
 631                           GNUNET_YES,
 632                           &transmit_send_continuation, mq);
 633   if (ret == -1)
 634   {
 635     /* failure, but 'send' would not call continuation in this case,
 636      * so we need to do it here! */
 637     transmit_send_continuation (mq, &n->id, GNUNET_SYSERR);
 638   }
 639
 640 }
 641
 642
 643 /**
 644  * Task invoked to start a transmission to another peer.
 645  *
 646  * @param cls the 'struct NeighbourMapEntry'
 647  * @param tc scheduler context
 648  */
 649 static void
 650 transmission_task (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
 651 {
 652   struct NeighbourMapEntry *n = cls;
 653   GNUNET_assert (NULL != lookup_neighbour(&n->id));
 654   n->transmission_task = GNUNET_SCHEDULER_NO_TASK;
 655   try_transmission_to_peer (n);
 656 }
 657
 658
 659 /**
 660  * Initialize the neighbours subsystem.
 661  *
 662  * @param cls closure for callbacks
 663  * @param connect_cb function to call if we connect to a peer
 664  * @param disconnect_cb function to call if we disconnect from a peer
 665  */
 666 void
 667 GST_neighbours_start (void *cls, GNUNET_TRANSPORT_NotifyConnect connect_cb,
 668                       GNUNET_TRANSPORT_NotifyDisconnect disconnect_cb)
 669 {
 670   callback_cls = cls;
 671   connect_notify_cb = connect_cb;
 672   disconnect_notify_cb = disconnect_cb;
 673   neighbours = GNUNET_CONTAINER_multihashmap_create (NEIGHBOUR_TABLE_SIZE);
 674 }
 675
 676 /*
 677 static void
 678 send_disconnect_cont (void *cls,
 679     const struct GNUNET_PeerIdentity * target,
 680     int result)
 681 {
 682   struct NeighbourMapEntry *n = cls;
 683
 684 }*/
 685
 686 static int
 687 send_disconnect (struct NeighbourMapEntry *n)
 688 {
 689   size_t ret;
 690   struct SessionDisconnectMessage disconnect_msg;
 691
 692 #if DEBUG_TRANSPORT
 693   GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Sending DISCONNECT message to peer `%4s'\n",
 694               GNUNET_i2s (&n->id));
 695 #endif
 696
 697   disconnect_msg.header.size = htons (sizeof (struct SessionDisconnectMessage));
 698   disconnect_msg.header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_DISCONNECT);
 699   disconnect_msg.reserved = htonl (0);
 700   disconnect_msg.purpose.size = htonl (sizeof (struct GNUNET_CRYPTO_RsaSignaturePurpose) +
 701                                        sizeof (struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded) +
 702                                        sizeof (struct GNUNET_TIME_AbsoluteNBO) );
 703   disconnect_msg.purpose.purpose = htonl (GNUNET_MESSAGE_TYPE_TRANSPORT_SESSION_DISCONNECT);
 704   disconnect_msg.timestamp = GNUNET_TIME_absolute_hton (GNUNET_TIME_absolute_get ());
 705   disconnect_msg.public_key = GST_my_public_key;
 706   GNUNET_assert (GNUNET_OK ==
 707                  GNUNET_CRYPTO_rsa_sign (GST_my_private_key,
 708                                          &disconnect_msg.purpose,
 709                                          &disconnect_msg.signature));
 710
 711   ret = send_with_plugin(&n->id, (const char *) &disconnect_msg, sizeof (disconnect_msg),
 712                           UINT32_MAX, GNUNET_TIME_UNIT_FOREVER_REL,
 713                           n->session, n->plugin_name, n->addr, n->addrlen,
 714                           GNUNET_YES, NULL, NULL);
 715
 716   if (ret == GNUNET_SYSERR)
 717     return GNUNET_SYSERR;
 718
 719   GNUNET_STATISTICS_update (GST_stats,
 720                             gettext_noop ("# peers disconnected due to external request"), 1,
 721                             GNUNET_NO);
 722   return GNUNET_OK;
 723 }
 724
 725 /**
 726  * Disconnect from the given neighbour, clean up the record.
 727  *
 728  * @param n neighbour to disconnect from
 729  */
 730 static void
 731 disconnect_neighbour (struct NeighbourMapEntry *n)
 732 {
 733   struct MessageQueue *mq;
 734   int was_connected = is_connected(n);
 735
 736   if (is_disconnecting(n) == GNUNET_YES)
 737     return;
 738
 739   /* send DISCONNECT MESSAGE */
 740   if (is_connected(n) || is_connecting(n))
 741   {
 742     if (GNUNET_OK == send_disconnect(n))
 743       GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Sent DISCONNECT_MSG to `%s'\n",
 744                   GNUNET_i2s (&n->id));
 745     else
 746       GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Could not send DISCONNECT_MSG to `%s'\n",
 747                   GNUNET_i2s (&n->id));
 748   }
 749
 750
 751   if (is_disconnecting(n))
 752     return;
 753   change_state (n, S_DISCONNECT);
 754
 755   while (NULL != (mq = n->messages_head))
 756   {
 757     GNUNET_CONTAINER_DLL_remove (n->messages_head, n->messages_tail, mq);
 758     if (NULL != mq->cont)
 759       mq->cont (mq->cont_cls, GNUNET_SYSERR);
 760     GNUNET_free (mq);
 761   }
 762   if (NULL != n->is_active)
 763   {
 764     n->is_active->n = NULL;
 765     n->is_active = NULL;
 766   }
 767   if (was_connected)
 768   {
 769     GNUNET_assert (GNUNET_SCHEDULER_NO_TASK != n->keepalive_task);
 770     GNUNET_SCHEDULER_cancel (n->keepalive_task);
 771     n->keepalive_task = GNUNET_SCHEDULER_NO_TASK;
 772     GNUNET_assert (neighbours_connected > 0);
 773     neighbours_connected--;
 774     GNUNET_STATISTICS_update (GST_stats, gettext_noop ("# peers connected"), -1,
 775                               GNUNET_NO);
 776     disconnect_notify_cb (callback_cls, &n->id);
 777   }
 778   GNUNET_assert (GNUNET_YES ==
 779                  GNUNET_CONTAINER_multihashmap_remove (neighbours,
 780                                                        &n->id.hashPubKey, n));
 781   if (GNUNET_SCHEDULER_NO_TASK != n->ats_suggest)
 782   {
 783     GNUNET_SCHEDULER_cancel (n->ats_suggest);
 784     n->ats_suggest = GNUNET_SCHEDULER_NO_TASK;
 785   }
 786   if (GNUNET_SCHEDULER_NO_TASK != n->timeout_task)
 787   {
 788     GNUNET_SCHEDULER_cancel (n->timeout_task);
 789     n->timeout_task = GNUNET_SCHEDULER_NO_TASK;
 790   }
 791   if (GNUNET_SCHEDULER_NO_TASK != n->transmission_task)
 792   {
 793     GNUNET_SCHEDULER_cancel (n->transmission_task);
 794     n->transmission_task = GNUNET_SCHEDULER_NO_TASK;
 795   }
 796   if (NULL != n->plugin_name)
 797   {
 798     GNUNET_free (n->plugin_name);
 799     n->plugin_name = NULL;
 800   }
 801   if (NULL != n->addr)
 802   {
 803     GNUNET_free (n->addr);
 804     n->addr = NULL;
 805     n->addrlen = 0;
 806   }
 807   n->session = NULL;
 808   GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Deleting peer `%4s', %X\n",
 809               GNUNET_i2s (&n->id), n);
 810   GNUNET_free (n);
 811 }
 812
 813
 814 /**
 815  * Peer has been idle for too long. Disconnect.
 816  *
 817  * @param cls the 'struct NeighbourMapEntry' of the neighbour that went idle
 818  * @param tc scheduler context
 819  */
 820 static void
 821 neighbour_timeout_task (void *cls,
 822                         const struct GNUNET_SCHEDULER_TaskContext *tc)
 823 {
 824   struct NeighbourMapEntry *n = cls;
 825
 826   n->timeout_task = GNUNET_SCHEDULER_NO_TASK;
 827
 828   GNUNET_STATISTICS_update (GST_stats,
 829                             gettext_noop ("# peers disconnected due to timeout"), 1,
 830                             GNUNET_NO);
 831   disconnect_neighbour (n);
 832 }
 833
 834
 835 /**
 836  * Send another keepalive message.
 837  *
 838  * @param cls the 'struct NeighbourMapEntry' of the neighbour that went idle
 839  * @param tc scheduler context
 840  */
 841 static void
 842 neighbour_keepalive_task (void *cls,
 843                           const struct GNUNET_SCHEDULER_TaskContext *tc)
 844 {
 845   struct NeighbourMapEntry *n = cls;
 846   struct GNUNET_MessageHeader m;
 847
 848   n->keepalive_task = GNUNET_SCHEDULER_add_delayed (KEEPALIVE_FREQUENCY,
 849                                                     &neighbour_keepalive_task,
 850                                                     n);
 851   GNUNET_assert (is_connected(n));
 852   GNUNET_STATISTICS_update (GST_stats,
 853                             gettext_noop ("# keepalives sent"), 1,
 854                             GNUNET_NO);
 855   m.size = htons (sizeof (struct GNUNET_MessageHeader));
 856   m.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_SESSION_KEEPALIVE);
 857
 858   send_with_plugin(&n->id, (const void *) &m,
 859                    sizeof (m),
 860                    UINT32_MAX /* priority */ ,
 861                    GNUNET_TIME_UNIT_FOREVER_REL,
 862                    n->session, n->plugin_name, n->addr, n->addrlen,
 863                    GNUNET_YES, NULL, NULL);
 864 }
 865
 866
 867 /**
 868  * Disconnect from the given neighbour.
 869  *
 870  * @param cls unused
 871  * @param key hash of neighbour's public key (not used)
 872  * @param value the 'struct NeighbourMapEntry' of the neighbour
 873  */
 874 static int
 875 disconnect_all_neighbours (void *cls, const GNUNET_HashCode * key, void *value)
 876 {
 877   struct NeighbourMapEntry *n = value;
 878
 879 #if DEBUG_TRANSPORT
 880   GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Disconnecting peer `%4s', %s\n",
 881               GNUNET_i2s (&n->id), "SHUTDOWN_TASK");
 882 #endif
 883   if (is_connected(n))
 884     GNUNET_STATISTICS_update (GST_stats,
 885                               gettext_noop ("# peers disconnected due to global disconnect"), 1,
 886                               GNUNET_NO);
 887   disconnect_neighbour (n);
 888   return GNUNET_OK;
 889 }
 890
 891
 892 static void
 893 ats_suggest_cancel (void *cls,
 894     const struct GNUNET_SCHEDULER_TaskContext *tc)
 895 {
 896   struct NeighbourMapEntry *n = cls;
 897
 898   n->ats_suggest = GNUNET_SCHEDULER_NO_TASK;
 899
 900   GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
 901               " ATS did not suggested address to connect to peer `%s'\n",
 902               GNUNET_i2s (&n->id));
 903
 904   disconnect_neighbour(n);
 905 }
 906
 907
 908 /**
 909  * Cleanup the neighbours subsystem.
 910  */
 911 void
 912 GST_neighbours_stop ()
 913 {
 914   GNUNET_assert (neighbours != NULL);
 915
 916   GNUNET_CONTAINER_multihashmap_iterate (neighbours, &disconnect_all_neighbours,
 917                                          NULL);
 918   GNUNET_CONTAINER_multihashmap_destroy (neighbours);
 919   GNUNET_assert (neighbours_connected == 0);
 920   neighbours = NULL;
 921   callback_cls = NULL;
 922   connect_notify_cb = NULL;
 923   disconnect_notify_cb = NULL;
 924 }
 925
 926
 927 /**
 928  * We tried to send a SESSION_CONNECT message to another peer.  If this
 929  * succeeded, we change the state.  If it failed, we should tell
 930  * ATS to not use this address anymore (until it is re-validated).
 931  *
 932  * @param cls the 'struct NeighbourMapEntry'
 933  * @param success GNUNET_OK on success
 934  */
 935 static void
 936 send_connect_continuation (void *cls,
 937       const struct GNUNET_PeerIdentity * target,
 938       int success)
 939
 940 {
 941   struct NeighbourMapEntry *n = cls;
 942
 943   GNUNET_assert (n != NULL);
 944   GNUNET_assert (!is_connected(n));
 945
 946   if (is_disconnecting(n))
 947     return; /* neighbour is going away */
 948   if (GNUNET_YES != success)
 949   {
 950 #if DEBUG_TRANSPORT
 951     GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
 952               "Failed to send CONNECT_MSG to peer `%4s' with plugin `%s' address '%s' session %X, asking ATS for new address \n",
 953               GNUNET_i2s (&n->id), n->plugin_name,
 954               (n->addrlen == 0) ? "<inbound>" : GST_plugins_a2s (n->plugin_name,
 955                                                                   n->addr,
 956                                                                   n->addrlen),
 957               n->session);
 958 #endif
 959
 960     GNUNET_ATS_address_destroyed (GST_ats,
 961                                   &n->id,
 962                                   n->plugin_name,
 963                                   n->addr,
 964                                   n->addrlen,
 965                                   NULL);
 966
 967     if (n->ats_suggest!= GNUNET_SCHEDULER_NO_TASK)
 968       GNUNET_SCHEDULER_cancel(n->ats_suggest);
 969     n->ats_suggest = GNUNET_SCHEDULER_add_delayed (ATS_RESPONSE_TIMEOUT, ats_suggest_cancel, n);
 970     GNUNET_ATS_suggest_address(GST_ats, &n->id);
 971     return;
 972   }
 973   change_state(n, S_CONNECT_SENT);
 974 }
 975
 976
 977 /**
 978  * We tried to switch addresses with an peer already connected. If it failed,
 979  * we should tell ATS to not use this address anymore (until it is re-validated).
 980  *
 981  * @param cls the 'struct NeighbourMapEntry'
 982  * @param success GNUNET_OK on success
 983  */
 984 static void
 985 send_switch_address_continuation (void *cls,
 986       const struct GNUNET_PeerIdentity * target,
 987       int success)
 988
 989 {
 990   struct NeighbourMapEntry *n = cls;
 991
 992   GNUNET_assert (n != NULL);
 993   if (is_disconnecting(n))
 994     return; /* neighbour is going away */
 995
 996   GNUNET_assert (n->state == S_CONNECTED);
 997   if (GNUNET_YES != success)
 998   {
 999 #if DEBUG_TRANSPORT
1000     GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1001               "Failed to switch connected peer `%s' to plugin `%s' address '%s' session %X, asking ATS for new address \n",
1002               GNUNET_i2s (&n->id), n->plugin_name,
1003               (n->addrlen == 0) ? "<inbound>" : GST_plugins_a2s (n->plugin_name,
1004                                                                   n->addr,
1005                                                                   n->addrlen),
1006               n->session);
1007 #endif
1008
1009     GNUNET_ATS_address_destroyed (GST_ats,
1010                                   &n->id,
1011                                   n->plugin_name,
1012                                   n->addr,
1013                                   n->addrlen,
1014                                   NULL);
1015
1016     if (n->ats_suggest != GNUNET_SCHEDULER_NO_TASK)
1017       GNUNET_SCHEDULER_cancel(n->ats_suggest);
1018     n->ats_suggest = GNUNET_SCHEDULER_add_delayed (ATS_RESPONSE_TIMEOUT, ats_suggest_cancel, n);
1019     GNUNET_ATS_suggest_address(GST_ats, &n->id);
1020     return;
1021   }
1022 }
1023
1024 /**
1025  * We tried to send a SESSION_CONNECT message to another peer.  If this
1026  * succeeded, we change the state.  If it failed, we should tell
1027  * ATS to not use this address anymore (until it is re-validated).
1028  *
1029  * @param cls the 'struct NeighbourMapEntry'
1030  * @param success GNUNET_OK on success
1031  */
1032 static void
1033 send_connect_ack_continuation (void *cls,
1034       const struct GNUNET_PeerIdentity * target,
1035       int success)
1036
1037 {
1038   struct NeighbourMapEntry *n = cls;
1039
1040   GNUNET_assert (n != NULL);
1041
1042   if (GNUNET_YES == success)
1043     return; /* sending successful */
1044
1045   /* sending failed, ask for next address  */
1046 #if DEBUG_TRANSPORT
1047     GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1048               "Failed to send CONNECT_MSG to peer `%4s' with plugin `%s' address '%s' session %X, asking ATS for new address \n",
1049               GNUNET_i2s (&n->id), n->plugin_name,
1050               (n->addrlen == 0) ? "<inbound>" : GST_plugins_a2s (n->plugin_name,
1051                                                                   n->addr,
1052                                                                   n->addrlen),
1053               n->session);
1054 #endif
1055     change_state(n, S_NOT_CONNECTED);
1056
1057     GNUNET_ATS_address_destroyed (GST_ats,
1058                                   &n->id,
1059                                   n->plugin_name,
1060                                   n->addr,
1061                                   n->addrlen,
1062                                   NULL);
1063
1064     if (n->ats_suggest != GNUNET_SCHEDULER_NO_TASK)
1065       GNUNET_SCHEDULER_cancel(n->ats_suggest);
1066     n->ats_suggest = GNUNET_SCHEDULER_add_delayed (ATS_RESPONSE_TIMEOUT, ats_suggest_cancel, n);
1067     GNUNET_ATS_suggest_address(GST_ats, &n->id);
1068 }
1069
1070 /**
1071  * For an existing neighbour record, set the active connection to
1072  * the given address.
1073  *
1074  * @param peer identity of the peer to switch the address for
1075  * @param plugin_name name of transport that delivered the PONG
1076  * @param address address of the other peer, NULL if other peer
1077  *                       connected to us
1078  * @param address_len number of bytes in address
1079  * @param session session to use (or NULL)
1080  * @param ats performance data
1081  * @param ats_count number of entries in ats
1082  * @return GNUNET_YES if we are currently connected, GNUNET_NO if the
1083  *         connection is not up (yet)
1084  */
1085 int
1086 GST_neighbours_switch_to_address_3way (const struct GNUNET_PeerIdentity *peer,
1087                                   const char *plugin_name, const void *address,
1088                                   size_t address_len, struct Session *session,
1089                                   const struct GNUNET_ATS_Information
1090                                   *ats, uint32_t ats_count,
1091                                   struct GNUNET_BANDWIDTH_Value32NBO bandwidth_in,
1092                                   struct GNUNET_BANDWIDTH_Value32NBO bandwidth_out)
1093 {
1094   struct NeighbourMapEntry *n;
1095   struct SessionConnectMessage connect_msg;
1096   size_t msg_len;
1097   size_t ret;
1098
1099   GNUNET_assert (neighbours != NULL);
1100   n = lookup_neighbour (peer);
1101   if (NULL == n)
1102   {
1103     if (NULL == session)
1104       GNUNET_ATS_address_destroyed (GST_ats,
1105                                     peer,
1106                                     plugin_name, address,
1107                                     address_len, NULL);
1108     return GNUNET_NO;
1109   }
1110
1111   if (n->ats_suggest != GNUNET_SCHEDULER_NO_TASK)
1112   {
1113     GNUNET_SCHEDULER_cancel(n->ats_suggest);
1114     n->ats_suggest = GNUNET_SCHEDULER_NO_TASK;
1115   }
1116
1117 #if DEBUG_TRANSPORT
1118   GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1119               "ATS tells us to switch to plugin `%s' address '%s' session %X for %s peer `%s'\n",
1120               plugin_name,
1121               (address_len == 0) ? "<inbound>" : GST_plugins_a2s (plugin_name,
1122                                                                   address,
1123                                                                   address_len),
1124               session, (is_connected(n) ? "CONNECTED" : "NOT CONNECTED"),
1125               GNUNET_i2s (peer));
1126 #endif
1127
1128   GNUNET_free_non_null (n->addr);
1129   n->addr = GNUNET_malloc (address_len);
1130   memcpy (n->addr, address, address_len);
1131   n->bandwidth_in = bandwidth_in;
1132   n->bandwidth_out = bandwidth_out;
1133   n->addrlen = address_len;
1134   n->session = session;
1135   GNUNET_free_non_null (n->plugin_name);
1136   n->plugin_name = GNUNET_strdup (plugin_name);
1137   GNUNET_SCHEDULER_cancel (n->timeout_task);
1138   n->timeout_task =
1139       GNUNET_SCHEDULER_add_delayed (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT,
1140                                     &neighbour_timeout_task, n);
1141
1142   if (n->state == S_DISCONNECT)
1143   {
1144     /* We are disconnecting, nothing to do here */
1145     return GNUNET_NO;
1146   }
1147   /* We are not connected/connecting and initiate a fresh connect */
1148   if (n->state == S_NOT_CONNECTED)
1149   {
1150     msg_len = sizeof (struct SessionConnectMessage);
1151     connect_msg.header.size = htons (msg_len);
1152     connect_msg.header.type =
1153         htons (GNUNET_MESSAGE_TYPE_TRANSPORT_SESSION_CONNECT);
1154     connect_msg.reserved = htonl (0);
1155     connect_msg.timestamp =
1156         GNUNET_TIME_absolute_hton (GNUNET_TIME_absolute_get ());
1157
1158     ret = send_with_plugin (peer, (const char *) &connect_msg, msg_len, UINT32_MAX, GNUNET_TIME_UNIT_FOREVER_REL,
1159                             session, plugin_name, address, address_len,
1160                             GNUNET_YES, &send_connect_continuation, n);
1161
1162     return GNUNET_NO;
1163   }
1164   /* We received a CONNECT message and asked ATS for an address */
1165   else if (n->state == S_CONNECT_RECV)
1166   {
1167     msg_len = sizeof (struct SessionConnectMessage);
1168     connect_msg.header.size = htons (msg_len);
1169     connect_msg.header.type =
1170       htons (GNUNET_MESSAGE_TYPE_TRANSPORT_SESSION_CONNECT_ACK);
1171     connect_msg.reserved = htonl (0);
1172     connect_msg.timestamp = GNUNET_TIME_absolute_hton (GNUNET_TIME_absolute_get ());
1173
1174     ret = send_with_plugin(&n->id, (const void *) &connect_msg, msg_len, UINT32_MAX, GNUNET_TIME_UNIT_FOREVER_REL,
1175                            session, plugin_name, address, address_len,
1176                            GNUNET_YES, &send_connect_ack_continuation, n);
1177     if (ret == GNUNET_SYSERR)
1178     {
1179       change_state (n, S_NOT_CONNECTED);
1180       GNUNET_break (0);
1181     }
1182     return GNUNET_NO;
1183   }
1184   /* connected peer is switching addresses */
1185   else if (n->state == S_CONNECTED)
1186   {
1187     msg_len = sizeof (struct SessionConnectMessage);
1188     connect_msg.header.size = htons (msg_len);
1189     connect_msg.header.type =
1190         htons (GNUNET_MESSAGE_TYPE_TRANSPORT_SESSION_CONNECT);
1191     connect_msg.reserved = htonl (0);
1192     connect_msg.timestamp =
1193         GNUNET_TIME_absolute_hton (GNUNET_TIME_absolute_get ());
1194
1195     ret = send_with_plugin (peer, (const char *) &connect_msg, msg_len, UINT32_MAX, GNUNET_TIME_UNIT_FOREVER_REL,
1196                             session, plugin_name, address, address_len,
1197                             GNUNET_YES, &send_switch_address_continuation, n);
1198     if (ret == GNUNET_SYSERR)
1199     {
1200       GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1201                 "Failed to send CONNECT_MESSAGE to `%4s' using plugin `%s' address '%s' session %X\n",
1202                 GNUNET_i2s (peer), plugin_name,
1203                 (address_len == 0) ? "<inbound>" : GST_plugins_a2s (plugin_name,
1204                                                                     address,
1205                                                                     address_len),
1206                 session);
1207     }
1208     return GNUNET_NO;
1209   }
1210
1211   GNUNET_log (GNUNET_ERROR_TYPE_ERROR, "Invalid connection state to switch addresses %u ", n->state);
1212   GNUNET_break_op (0);
1213   return GNUNET_NO;
1214 }
1215
1216
1217 /**
1218  * Create an entry in the neighbour map for the given peer
1219  *
1220  * @param peer peer to create an entry for
1221  * @return new neighbour map entry
1222  */
1223 static struct NeighbourMapEntry *
1224 setup_neighbour (const struct GNUNET_PeerIdentity *peer)
1225 {
1226   struct NeighbourMapEntry *n;
1227
1228 #if DEBUG_TRANSPORT
1229   GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1230               "Unknown peer `%s', creating new neighbour\n",
1231               GNUNET_i2s (peer));
1232 #endif
1233   n = GNUNET_malloc (sizeof (struct NeighbourMapEntry));
1234   n->id = *peer;
1235   n->state = S_NOT_CONNECTED;
1236   GNUNET_BANDWIDTH_tracker_init (&n->in_tracker,
1237                                  GNUNET_CONSTANTS_DEFAULT_BW_IN_OUT,
1238                                  MAX_BANDWIDTH_CARRY_S);
1239   n->timeout_task =
1240     GNUNET_SCHEDULER_add_delayed (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT,
1241                                   &neighbour_timeout_task, n);
1242   GNUNET_assert (GNUNET_OK ==
1243                  GNUNET_CONTAINER_multihashmap_put (neighbours,
1244                                                     &n->id.hashPubKey, n,
1245                                                     GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY));
1246   return n;
1247 }
1248
1249
1250 /**
1251  * Try to create a connection to the given target (eventually).
1252  *
1253  * @param target peer to try to connect to
1254  */
1255 void
1256 GST_neighbours_try_connect (const struct GNUNET_PeerIdentity *target)
1257 {
1258   struct NeighbourMapEntry *n;
1259
1260   GNUNET_assert (neighbours != NULL);
1261 #if DEBUG_TRANSPORT
1262   GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Trying to connect to peer `%s'\n",
1263               GNUNET_i2s (target));
1264 #endif
1265   GNUNET_assert (0 !=
1266                  memcmp (target, &GST_my_identity,
1267                          sizeof (struct GNUNET_PeerIdentity)));
1268   n = lookup_neighbour (target);
1269
1270   if (NULL != n)
1271   {
1272     if ((is_connected(n)) || (is_connecting(n)))
1273       return;                     /* already connecting or connected */
1274     if (is_disconnecting(n))
1275       change_state (n, S_NOT_CONNECTED);
1276   }
1277
1278
1279   if (n == NULL)
1280     n = setup_neighbour (target);
1281 #if DEBUG_TRANSPORT
1282   GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1283               "Asking ATS for suggested address to connect to peer `%s'\n",
1284               GNUNET_i2s (&n->id));
1285 #endif
1286
1287   if (n->ats_suggest != GNUNET_SCHEDULER_NO_TASK)
1288     GNUNET_SCHEDULER_cancel(n->ats_suggest);
1289    n->ats_suggest = GNUNET_SCHEDULER_add_delayed (ATS_RESPONSE_TIMEOUT, ats_suggest_cancel, n);
1290    GNUNET_ATS_suggest_address (GST_ats, &n->id);
1291 }
1292
1293 /**
1294  * Test if we're connected to the given peer.
1295  *
1296  * @param target peer to test
1297  * @return GNUNET_YES if we are connected, GNUNET_NO if not
1298  */
1299 int
1300 GST_neighbours_test_connected (const struct GNUNET_PeerIdentity *target)
1301 {
1302   struct NeighbourMapEntry *n;
1303
1304   GNUNET_assert (neighbours != NULL);
1305
1306   n = lookup_neighbour (target);
1307
1308   if ((NULL == n) || (!is_connected(n)))
1309     return GNUNET_NO;           /* not connected */
1310   return GNUNET_YES;
1311 }
1312
1313
1314 /**
1315  * A session was terminated. Take note.
1316  *
1317  * @param peer identity of the peer where the session died
1318  * @param session session that is gone
1319  */
1320 void
1321 GST_neighbours_session_terminated (const struct GNUNET_PeerIdentity *peer,
1322                                    struct Session *session)
1323 {
1324   struct NeighbourMapEntry *n;
1325
1326   GNUNET_assert (neighbours != NULL);
1327
1328 #if DEBUG_TRANSPORT
1329   GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1330               "Session %X to peer `%s' ended \n",
1331               session, GNUNET_i2s (peer));
1332 #endif
1333
1334   n = lookup_neighbour (peer);
1335   if (NULL == n)
1336     return;
1337   if (session != n->session)
1338     return;                     /* doesn't affect us */
1339
1340   n->session = NULL;
1341   GNUNET_free (n->addr);
1342   n->addr = NULL;
1343   n->addrlen = 0;
1344
1345   /* not connected anymore anyway, shouldn't matter */
1346   if ((!is_connected(n)) && (!is_connecting(n)))
1347     return;
1348
1349   /* We are connected, so ask ATS to switch addresses */
1350   GNUNET_SCHEDULER_cancel (n->timeout_task);
1351   n->timeout_task =
1352       GNUNET_SCHEDULER_add_delayed (GNUNET_CONSTANTS_DISCONNECT_SESSION_TIMEOUT,
1353                                     &neighbour_timeout_task, n);
1354   /* try QUICKLY to re-establish a connection, reduce timeout! */
1355   if (n->ats_suggest != GNUNET_SCHEDULER_NO_TASK)
1356     GNUNET_SCHEDULER_cancel(n->ats_suggest);
1357   n->ats_suggest = GNUNET_SCHEDULER_add_delayed (ATS_RESPONSE_TIMEOUT, ats_suggest_cancel, n);
1358   GNUNET_ATS_suggest_address (GST_ats, peer);
1359 }
1360
1361
1362 /**
1363  * Transmit a message to the given target using the active connection.
1364  *
1365  * @param target destination
1366  * @param msg message to send
1367  * @param msg_size number of bytes in msg
1368  * @param timeout when to fail with timeout
1369  * @param cont function to call when done
1370  * @param cont_cls closure for 'cont'
1371  */
1372 void
1373 GST_neighbours_send (const struct GNUNET_PeerIdentity *target, const void *msg,
1374                      size_t msg_size, struct GNUNET_TIME_Relative timeout,
1375                      GST_NeighbourSendContinuation cont, void *cont_cls)
1376 {
1377   struct NeighbourMapEntry *n;
1378   struct MessageQueue *mq;
1379
1380   GNUNET_assert (neighbours != NULL);
1381
1382   n = lookup_neighbour (target);
1383   if ((n == NULL) || (!is_connected(n)))
1384   {
1385     GNUNET_STATISTICS_update (GST_stats,
1386                               gettext_noop
1387                               ("# messages not sent (no such peer or not connected)"),
1388                               1, GNUNET_NO);
1389 #if DEBUG_TRANSPORT
1390     if (n == NULL)
1391       GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1392                   "Could not send message to peer `%s': unknown neighbour",
1393                   GNUNET_i2s (target));
1394     else if (!is_connected(n))
1395       GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1396                   "Could not send message to peer `%s': not connected\n",
1397                   GNUNET_i2s (target));
1398 #endif
1399     if (NULL != cont)
1400       cont (cont_cls, GNUNET_SYSERR);
1401     return;
1402   }
1403
1404   if ((n->session == NULL) && (n->addr == NULL) && (n->addrlen ==0))
1405   {
1406     GNUNET_STATISTICS_update (GST_stats,
1407                               gettext_noop
1408                               ("# messages not sent (no such peer or not connected)"),
1409                               1, GNUNET_NO);
1410 #if DEBUG_TRANSPORT
1411       GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1412                   "Could not send message to peer `%s': no address available\n",
1413                   GNUNET_i2s (target));
1414 #endif
1415
1416     if (NULL != cont)
1417       cont (cont_cls, GNUNET_SYSERR);
1418     return;
1419   }
1420
1421   GNUNET_assert (msg_size >= sizeof (struct GNUNET_MessageHeader));
1422   GNUNET_STATISTICS_update (GST_stats,
1423                             gettext_noop
1424                             ("# bytes in message queue for other peers"),
1425                             msg_size, GNUNET_NO);
1426   mq = GNUNET_malloc (sizeof (struct MessageQueue) + msg_size);
1427   mq->cont = cont;
1428   mq->cont_cls = cont_cls;
1429   /* FIXME: this memcpy can be up to 7% of our total runtime! */
1430   memcpy (&mq[1], msg, msg_size);
1431   mq->message_buf = (const char *) &mq[1];
1432   mq->message_buf_size = msg_size;
1433   mq->timeout = GNUNET_TIME_relative_to_absolute (timeout);
1434   GNUNET_CONTAINER_DLL_insert_tail (n->messages_head, n->messages_tail, mq);
1435
1436   if ((GNUNET_SCHEDULER_NO_TASK == n->transmission_task) &&
1437       (NULL == n->is_active))
1438     n->transmission_task = GNUNET_SCHEDULER_add_now (&transmission_task, n);
1439 }
1440
1441
1442 /**
1443  * We have received a message from the given sender.  How long should
1444  * we delay before receiving more?  (Also used to keep the peer marked
1445  * as live).
1446  *
1447  * @param sender sender of the message
1448  * @param size size of the message
1449  * @param do_forward set to GNUNET_YES if the message should be forwarded to clients
1450  *                   GNUNET_NO if the neighbour is not connected or violates the quota,
1451  *                   GNUNET_SYSERR if the connection is not fully up yet
1452  * @return how long to wait before reading more from this sender
1453  */
1454 struct GNUNET_TIME_Relative
1455 GST_neighbours_calculate_receive_delay (const struct GNUNET_PeerIdentity
1456                                         *sender, ssize_t size, int *do_forward)
1457 {
1458   struct NeighbourMapEntry *n;
1459   struct GNUNET_TIME_Relative ret;
1460
1461   GNUNET_assert (neighbours != NULL);
1462
1463   n = lookup_neighbour (sender);
1464   if (n == NULL)
1465   {
1466     GST_neighbours_try_connect (sender);
1467     n = lookup_neighbour (sender);
1468     if (NULL == n)
1469     {
1470       GNUNET_STATISTICS_update (GST_stats,
1471                                 gettext_noop
1472                                 ("# messages discarded due to lack of neighbour record"),
1473                                 1, GNUNET_NO);
1474       *do_forward = GNUNET_NO;
1475       return GNUNET_TIME_UNIT_ZERO;
1476     }
1477   }
1478   if (!is_connected(n))
1479   {
1480     GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
1481                 _("Plugin gave us %d bytes of data but somehow the session is not marked as UP yet!\n"),
1482                 (int) size);
1483     *do_forward = GNUNET_SYSERR;
1484     return GNUNET_TIME_UNIT_ZERO;
1485   }
1486   if (GNUNET_YES == GNUNET_BANDWIDTH_tracker_consume (&n->in_tracker, size))
1487   {
1488     n->quota_violation_count++;
1489 #if DEBUG_TRANSPORT
1490     GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1491                 "Bandwidth quota (%u b/s) violation detected (total of %u).\n",
1492                 n->in_tracker.available_bytes_per_s__,
1493                 n->quota_violation_count);
1494 #endif
1495     /* Discount 32k per violation */
1496     GNUNET_BANDWIDTH_tracker_consume (&n->in_tracker, -32 * 1024);
1497   }
1498   else
1499   {
1500     if (n->quota_violation_count > 0)
1501     {
1502       /* try to add 32k back */
1503       GNUNET_BANDWIDTH_tracker_consume (&n->in_tracker, 32 * 1024);
1504       n->quota_violation_count--;
1505     }
1506   }
1507   if (n->quota_violation_count > QUOTA_VIOLATION_DROP_THRESHOLD)
1508   {
1509     GNUNET_STATISTICS_update (GST_stats,
1510                               gettext_noop
1511                               ("# bandwidth quota violations by other peers"),
1512                               1, GNUNET_NO);
1513     *do_forward = GNUNET_NO;
1514     return GNUNET_CONSTANTS_QUOTA_VIOLATION_TIMEOUT;
1515   }
1516   *do_forward = GNUNET_YES;
1517   ret = GNUNET_BANDWIDTH_tracker_get_delay (&n->in_tracker, 32 * 1024);
1518   if (ret.rel_value > 0)
1519   {
1520 #if DEBUG_TRANSPORT
1521     GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1522                 "Throttling read (%llu bytes excess at %u b/s), waiting %llu ms before reading more.\n",
1523                 (unsigned long long) n->in_tracker.
1524                 consumption_since_last_update__,
1525                 (unsigned int) n->in_tracker.available_bytes_per_s__,
1526                 (unsigned long long) ret.rel_value);
1527 #endif
1528     GNUNET_STATISTICS_update (GST_stats,
1529                               gettext_noop ("# ms throttling suggested"),
1530                               (int64_t) ret.rel_value, GNUNET_NO);
1531   }
1532   return ret;
1533 }
1534
1535
1536 /**
1537  * Keep the connection to the given neighbour alive longer,
1538  * we received a KEEPALIVE (or equivalent).
1539  *
1540  * @param neighbour neighbour to keep alive
1541  */
1542 void
1543 GST_neighbours_keepalive (const struct GNUNET_PeerIdentity *neighbour)
1544 {
1545   struct NeighbourMapEntry *n;
1546
1547   GNUNET_assert (neighbours != NULL);
1548
1549   n = lookup_neighbour (neighbour);
1550   if (NULL == n)
1551   {
1552     GNUNET_STATISTICS_update (GST_stats,
1553                               gettext_noop
1554                               ("# KEEPALIVE messages discarded (not connected)"),
1555                               1, GNUNET_NO);
1556     return;
1557   }
1558   GNUNET_SCHEDULER_cancel (n->timeout_task);
1559   n->timeout_task =
1560       GNUNET_SCHEDULER_add_delayed (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT,
1561                                     &neighbour_timeout_task, n);
1562 }
1563
1564
1565 /**
1566  * Change the incoming quota for the given peer.
1567  *
1568  * @param neighbour identity of peer to change qutoa for
1569  * @param quota new quota
1570  */
1571 void
1572 GST_neighbours_set_incoming_quota (const struct GNUNET_PeerIdentity *neighbour,
1573                                    struct GNUNET_BANDWIDTH_Value32NBO quota)
1574 {
1575   struct NeighbourMapEntry *n;
1576
1577   GNUNET_assert (neighbours != NULL);
1578
1579   n = lookup_neighbour (neighbour);
1580   if (n == NULL)
1581   {
1582     GNUNET_STATISTICS_update (GST_stats,
1583                               gettext_noop
1584                               ("# SET QUOTA messages ignored (no such peer)"),
1585                               1, GNUNET_NO);
1586     return;
1587   }
1588   GNUNET_BANDWIDTH_tracker_update_quota (&n->in_tracker, quota);
1589   if (0 != ntohl (quota.value__))
1590     return;
1591 #if DEBUG_TRANSPORT
1592   GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Disconnecting peer `%4s' due to `%s'\n",
1593               GNUNET_i2s (&n->id), "SET_QUOTA");
1594 #endif
1595   if (is_connected(n))
1596     GNUNET_STATISTICS_update (GST_stats,
1597                               gettext_noop ("# disconnects due to quota of 0"), 1,
1598                               GNUNET_NO);
1599   disconnect_neighbour (n);
1600 }
1601
1602
1603 /**
1604  * Closure for the neighbours_iterate function.
1605  */
1606 struct IteratorContext
1607 {
1608   /**
1609    * Function to call on each connected neighbour.
1610    */
1611   GST_NeighbourIterator cb;
1612
1613   /**
1614    * Closure for 'cb'.
1615    */
1616   void *cb_cls;
1617 };
1618
1619
1620 /**
1621  * Call the callback from the closure for each connected neighbour.
1622  *
1623  * @param cls the 'struct IteratorContext'
1624  * @param key the hash of the public key of the neighbour
1625  * @param value the 'struct NeighbourMapEntry'
1626  * @return GNUNET_OK (continue to iterate)
1627  */
1628 static int
1629 neighbours_iterate (void *cls, const GNUNET_HashCode * key, void *value)
1630 {
1631   struct IteratorContext *ic = cls;
1632   struct NeighbourMapEntry *n = value;
1633
1634   if (is_connected(n))
1635     return GNUNET_OK;
1636
1637   ic->cb (ic->cb_cls, &n->id, NULL, 0, n->plugin_name, n->addr, n->addrlen);
1638   return GNUNET_OK;
1639 }
1640
1641
1642 /**
1643  * Iterate over all connected neighbours.
1644  *
1645  * @param cb function to call
1646  * @param cb_cls closure for cb
1647  */
1648 void
1649 GST_neighbours_iterate (GST_NeighbourIterator cb, void *cb_cls)
1650 {
1651   struct IteratorContext ic;
1652
1653   GNUNET_assert (neighbours != NULL);
1654
1655   ic.cb = cb;
1656   ic.cb_cls = cb_cls;
1657   GNUNET_CONTAINER_multihashmap_iterate (neighbours, &neighbours_iterate, &ic);
1658 }
1659
1660 /**
1661  * If we have an active connection to the given target, it must be shutdown.
1662  *
1663  * @param target peer to disconnect from
1664  */
1665 void
1666 GST_neighbours_force_disconnect (const struct GNUNET_PeerIdentity *target)
1667 {
1668   struct NeighbourMapEntry *n;
1669
1670   GNUNET_assert (neighbours != NULL);
1671
1672   n = lookup_neighbour (target);
1673   if (NULL == n)
1674     return;                     /* not active */
1675   if (is_connected(n))
1676   {
1677     send_disconnect(n);
1678
1679     n = lookup_neighbour (target);
1680     if (NULL == n)
1681       return;                     /* gone already */
1682   }
1683   disconnect_neighbour (n);
1684 }
1685
1686
1687 /**
1688  * We received a disconnect message from the given peer,
1689  * validate and process.
1690  *
1691  * @param peer sender of the message
1692  * @param msg the disconnect message
1693  */
1694 void
1695 GST_neighbours_handle_disconnect_message (const struct GNUNET_PeerIdentity *peer,
1696                                           const struct GNUNET_MessageHeader *msg)
1697 {
1698   struct NeighbourMapEntry *n;
1699   const struct SessionDisconnectMessage *sdm;
1700   GNUNET_HashCode hc;
1701
1702 #if DEBUG_TRANSPORT
1703   GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1704       "Received DISCONNECT message from peer `%s'\n", GNUNET_i2s (peer));
1705 #endif
1706
1707   if (ntohs (msg->size) != sizeof (struct SessionDisconnectMessage))
1708   {
1709     // GNUNET_break_op (0);
1710     GNUNET_STATISTICS_update (GST_stats,
1711                               gettext_noop ("# disconnect messages ignored (old format)"), 1,
1712                               GNUNET_NO);
1713     return;
1714   }
1715   sdm = (const struct SessionDisconnectMessage* ) msg;
1716   n = lookup_neighbour (peer);
1717   if (NULL == n)
1718     return;                     /* gone already */
1719   if (GNUNET_TIME_absolute_ntoh (sdm->timestamp).abs_value <=
1720       n->connect_ts.abs_value)
1721   {
1722     GNUNET_STATISTICS_update (GST_stats,
1723                               gettext_noop ("# disconnect messages ignored (timestamp)"), 1,
1724                               GNUNET_NO);
1725     return;
1726   }
1727   GNUNET_CRYPTO_hash (&sdm->public_key,
1728                       sizeof (struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded),
1729                       &hc);
1730   if (0 != memcmp (peer,
1731                    &hc,
1732                    sizeof (struct GNUNET_PeerIdentity)))
1733   {
1734     GNUNET_break_op (0);
1735     return;
1736   }
1737   if (ntohl (sdm->purpose.size) !=
1738       sizeof (struct GNUNET_CRYPTO_RsaSignaturePurpose) +
1739       sizeof (struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded) +
1740       sizeof (struct GNUNET_TIME_AbsoluteNBO))
1741   {
1742     GNUNET_break_op (0);
1743     return;
1744   }
1745   if (GNUNET_OK !=
1746       GNUNET_CRYPTO_rsa_verify (GNUNET_MESSAGE_TYPE_TRANSPORT_SESSION_DISCONNECT,
1747                                 &sdm->purpose,
1748                                 &sdm->signature,
1749                                 &sdm->public_key))
1750   {
1751     GNUNET_break_op (0);
1752     return;
1753   }
1754   GST_neighbours_force_disconnect (peer);
1755 }
1756
1757 /**
1758  * We received a 'SESSION_CONNECT_ACK' message from the other peer.
1759  * Consider switching to it.
1760  *
1761  * @param message possibly a 'struct SessionConnectMessage' (check format)
1762  * @param peer identity of the peer to switch the address for
1763  * @param plugin_name name of transport that delivered the PONG
1764  * @param address address of the other peer, NULL if other peer
1765  *                       connected to us
1766  * @param address_len number of bytes in address
1767  * @param session session to use (or NULL)
1768  * @param ats performance data
1769  * @param ats_count number of entries in ats
1770   */
1771 void
1772 GST_neighbours_handle_connect_ack (const struct GNUNET_MessageHeader *message,
1773                                const struct GNUNET_PeerIdentity *peer,
1774                                const char *plugin_name,
1775                                const char *sender_address, uint16_t sender_address_len,
1776                                struct Session *session,
1777                                const struct GNUNET_ATS_Information *ats,
1778                                uint32_t ats_count)
1779 {
1780   const struct SessionConnectMessage *scm;
1781   struct QuotaSetMessage q_msg;
1782   struct GNUNET_MessageHeader msg;
1783   struct GNUNET_TIME_Absolute ts;
1784   struct NeighbourMapEntry *n;
1785   size_t msg_len;
1786   size_t ret;
1787
1788 #if DEBUG_TRANSPORT
1789 #endif
1790   GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
1791       "Received CONNECT_ACK message from peer `%s'\n", GNUNET_i2s (peer));
1792
1793
1794   if (ntohs (message->size) != sizeof (struct SessionConnectMessage))
1795   {
1796     GNUNET_break_op (0);
1797     return;
1798   }
1799
1800   scm = (const struct SessionConnectMessage *) message;
1801   GNUNET_break_op (ntohl (scm->reserved) == 0);
1802   ts = GNUNET_TIME_absolute_ntoh (scm->timestamp);
1803   n = lookup_neighbour (peer);
1804   if (NULL == n)
1805     n = setup_neighbour (peer);
1806 /*
1807   if (n->state != S_CONNECT_SENT)
1808   {
1809     GNUNET_break (0);
1810     send_disconnect(n);
1811     return;
1812   }
1813 */
1814   if (NULL != session)
1815     GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG | GNUNET_ERROR_TYPE_BULK,
1816                      "transport-ats",
1817                      "Giving ATS session %p of plugin %s for peer %s\n",
1818                      session,
1819                      plugin_name,
1820                      GNUNET_i2s (peer));
1821   GNUNET_ATS_address_update (GST_ats,
1822                              peer,
1823                              plugin_name, sender_address, sender_address_len,
1824                              session, ats, ats_count);
1825
1826   change_state (n, S_CONNECTED);
1827
1828 #if DEBUG_TRANSPORT
1829   GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
1830               "Setting inbound quota of %u for peer `%s' to \n",
1831               ntohl (n->bandwidth_in.value__), GNUNET_i2s (&n->id));
1832 #endif
1833   GST_neighbours_set_incoming_quota(&n->id, n->bandwidth_in);
1834
1835   n->keepalive_task = GNUNET_SCHEDULER_add_delayed (KEEPALIVE_FREQUENCY,
1836                                                       &neighbour_keepalive_task,
1837                                                       n);
1838   /* send ACK (ACK)*/
1839   msg_len =  sizeof (msg);
1840   msg.size = htons (msg_len);
1841   msg.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_SESSION_ACK);
1842
1843   ret = send_with_plugin (&n->id, (const char *) &msg, msg_len, UINT32_MAX,
1844                           GNUNET_TIME_UNIT_FOREVER_REL,
1845                           n->session, n->plugin_name, n->addr, n->addrlen,
1846                           GNUNET_YES, NULL, NULL);
1847
1848   if (ret == GNUNET_SYSERR)
1849     GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1850               "Failed to send SESSION_ACK to `%4s' using plugin `%s' address '%s' session %X\n",
1851               GNUNET_i2s (&n->id), n->plugin_name,
1852               (n->addrlen == 0) ? "<inbound>" : GST_plugins_a2s (n->plugin_name,
1853                                                                  n->addr,
1854                                                                  n->addrlen),
1855               n->session);
1856
1857   neighbours_connected++;
1858   GNUNET_STATISTICS_update (GST_stats, gettext_noop ("# peers connected"), 1,
1859                             GNUNET_NO);
1860   connect_notify_cb (callback_cls, &n->id, ats, ats_count);
1861
1862 #if DEBUG_TRANSPORT
1863   GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1864               "Sending outbound quota of %u Bps for peer `%s' to all clients\n",
1865               ntohl (n->bandwidth_out.value__), GNUNET_i2s (peer));
1866 #endif
1867   q_msg.header.size = htons (sizeof (struct QuotaSetMessage));
1868   q_msg.header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_SET_QUOTA);
1869   q_msg.quota = n->bandwidth_out;
1870   q_msg.peer = (*peer);
1871   GST_clients_broadcast (&q_msg.header, GNUNET_NO);
1872 }
1873
1874 void
1875 GST_neighbours_handle_ack (const struct GNUNET_MessageHeader *message,
1876     const struct GNUNET_PeerIdentity *peer,
1877     const char *plugin_name,
1878     const char *sender_address, uint16_t sender_address_len,
1879     struct Session *session,
1880     const struct GNUNET_ATS_Information *ats,
1881     uint32_t ats_count)
1882 {
1883   struct NeighbourMapEntry *n;
1884   struct QuotaSetMessage q_msg;
1885
1886 #if DEBUG_TRANSPORT
1887   GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1888       "Received ACK message from peer `%s'\n", GNUNET_i2s (peer));
1889 #endif
1890
1891   if (ntohs (message->size) != sizeof (struct GNUNET_MessageHeader))
1892   {
1893     GNUNET_break_op (0);
1894     return;
1895   }
1896
1897   n = lookup_neighbour (peer);
1898   if (NULL == n)
1899   {
1900     send_disconnect(n);
1901     GNUNET_break (0);
1902   }
1903 // FIXME check this
1904 //  if (n->state != S_CONNECT_RECV)
1905 /*  if (is_connecting(n))
1906   {
1907     send_disconnect (n);
1908     change_state (n, S_DISCONNECT);
1909     GNUNET_break (0);
1910     return;
1911   }
1912 */
1913   if (is_connected(n))
1914     return;
1915
1916   if (NULL != session)
1917     GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG | GNUNET_ERROR_TYPE_BULK,
1918                      "transport-ats",
1919                      "Giving ATS session %p of plugin %s for peer %s\n",
1920                      session,
1921                      plugin_name,
1922                      GNUNET_i2s (peer));
1923   GNUNET_ATS_address_update (GST_ats,
1924                              peer,
1925                              plugin_name, sender_address, sender_address_len,
1926                              session, ats, ats_count);
1927
1928   change_state (n, S_CONNECTED);
1929
1930   GST_neighbours_set_incoming_quota(&n->id, n->bandwidth_in);
1931
1932   n->keepalive_task = GNUNET_SCHEDULER_add_delayed (KEEPALIVE_FREQUENCY,
1933                                                       &neighbour_keepalive_task,
1934                                                       n);
1935
1936   neighbours_connected++;
1937   GNUNET_STATISTICS_update (GST_stats, gettext_noop ("# peers connected"), 1,
1938                             GNUNET_NO);
1939   connect_notify_cb (callback_cls, &n->id, ats, ats_count);
1940
1941 #if DEBUG_TRANSPORT
1942   GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1943               "Sending outbound quota of %u Bps for peer `%s' to all clients\n",
1944               ntohl (n->bandwidth_out.value__), GNUNET_i2s (peer));
1945 #endif
1946
1947   q_msg.header.size = htons (sizeof (struct QuotaSetMessage));
1948   q_msg.header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_SET_QUOTA);
1949   q_msg.quota = n->bandwidth_out;
1950   q_msg.peer = (*peer);
1951   GST_clients_broadcast (&q_msg.header, GNUNET_NO);
1952 }
1953
1954 struct BlackListCheckContext
1955 {
1956   struct GNUNET_ATS_Information *ats;
1957
1958   uint32_t ats_count;
1959
1960   struct Session *session;
1961
1962   char *sender_address;
1963
1964   uint16_t sender_address_len;
1965
1966   char *plugin_name;
1967
1968   struct GNUNET_TIME_Absolute ts;
1969 };
1970
1971
1972 static void
1973 handle_connect_blacklist_cont (void *cls,
1974                                const struct GNUNET_PeerIdentity
1975                                * peer, int result)
1976 {
1977   struct NeighbourMapEntry *n;
1978   struct BlackListCheckContext * bcc = cls;
1979
1980 #if DEBUG_TRANSPORT
1981   GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1982       "Blacklist check due to CONNECT message: `%s'\n", GNUNET_i2s (peer), (result == GNUNET_OK) ? "ALLOWED" : "FORBIDDEN");
1983 #endif
1984
1985   /* not allowed */
1986   if (GNUNET_OK != result)
1987   {
1988     GNUNET_free (bcc);
1989     return;
1990   }
1991
1992   n = lookup_neighbour (peer);
1993   if (NULL == n)
1994     n = setup_neighbour (peer);
1995
1996   if (bcc->ts.abs_value > n->connect_ts.abs_value)
1997   {
1998     if (NULL != bcc->session)
1999       GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG | GNUNET_ERROR_TYPE_BULK,
2000                        "transport-ats",
2001                        "Giving ATS session %p of plugin %s address `%s' for peer %s\n",
2002                        bcc->session,
2003                        bcc->plugin_name,
2004                        GST_plugins_a2s (bcc->plugin_name, bcc->sender_address, bcc->sender_address_len),
2005                        GNUNET_i2s (peer));
2006     GNUNET_ATS_address_update (GST_ats,
2007                                peer,
2008                                bcc->plugin_name, bcc->sender_address, bcc->sender_address_len,
2009                                bcc->session, bcc->ats, bcc->ats_count);
2010     n->connect_ts = bcc->ts;
2011   }
2012
2013   GNUNET_free (bcc);
2014 /*
2015   if (n->state != S_NOT_CONNECTED)
2016     return;*/
2017   change_state (n, S_CONNECT_RECV);
2018
2019   /* Ask ATS for an address to connect via that address */
2020   if (n->ats_suggest != GNUNET_SCHEDULER_NO_TASK)
2021     GNUNET_SCHEDULER_cancel(n->ats_suggest);
2022   n->ats_suggest = GNUNET_SCHEDULER_add_delayed (ATS_RESPONSE_TIMEOUT, ats_suggest_cancel, n);
2023   GNUNET_ATS_suggest_address(GST_ats, peer);
2024 }
2025
2026 /**
2027  * We received a 'SESSION_CONNECT' message from the other peer.
2028  * Consider switching to it.
2029  *
2030  * @param message possibly a 'struct SessionConnectMessage' (check format)
2031  * @param peer identity of the peer to switch the address for
2032  * @param plugin_name name of transport that delivered the PONG
2033  * @param address address of the other peer, NULL if other peer
2034  *                       connected to us
2035  * @param address_len number of bytes in address
2036  * @param session session to use (or NULL)
2037  * @param ats performance data
2038  * @param ats_count number of entries in ats (excluding 0-termination)
2039   */
2040 void
2041 GST_neighbours_handle_connect (const struct GNUNET_MessageHeader *message,
2042                                const struct GNUNET_PeerIdentity *peer,
2043                                const char *plugin_name,
2044                                const char *sender_address, uint16_t sender_address_len,
2045                                struct Session *session,
2046                                const struct GNUNET_ATS_Information *ats,
2047                                uint32_t ats_count)
2048 {
2049   const struct SessionConnectMessage *scm;
2050   struct NeighbourMapEntry * n;
2051   struct BlackListCheckContext * bcc = NULL;
2052
2053 #if DEBUG_TRANSPORT
2054 #endif
2055   GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
2056       "Received CONNECT message from peer `%s'\n", GNUNET_i2s (peer));
2057
2058
2059   if (ntohs (message->size) != sizeof (struct SessionConnectMessage))
2060   {
2061     GNUNET_break_op (0);
2062     return;
2063   }
2064
2065   scm = (const struct SessionConnectMessage *) message;
2066   GNUNET_break_op (ntohl (scm->reserved) == 0);
2067
2068   n = lookup_neighbour(peer);
2069   if (n != NULL)
2070   {
2071     /* connected peer switches addresses */
2072     if (is_connected(n))
2073     {
2074       GNUNET_ATS_address_update(GST_ats, peer, plugin_name, sender_address, sender_address_len, session, ats, ats_count);
2075       return;
2076     }
2077   }
2078
2079   /* we are not connected to this peer */
2080   /* do blacklist check*/
2081   bcc = GNUNET_malloc (sizeof (struct BlackListCheckContext) +
2082             sizeof (struct GNUNET_ATS_Information) * ats_count +
2083             sender_address_len +
2084             strlen (plugin_name)+1);
2085
2086   bcc->ts = GNUNET_TIME_absolute_ntoh (scm->timestamp);
2087
2088   bcc->ats_count = ats_count;
2089   bcc->sender_address_len = sender_address_len;
2090   bcc->session = session;
2091
2092   bcc->ats = (struct GNUNET_ATS_Information *) &bcc[1];
2093   memcpy (bcc->ats, ats,sizeof (struct GNUNET_ATS_Information) * ats_count );
2094
2095   bcc->sender_address = (char *) &bcc->ats[ats_count];
2096   memcpy (bcc->sender_address, sender_address , sender_address_len);
2097
2098   bcc->plugin_name = &bcc->sender_address[sender_address_len];
2099   strcpy (bcc->plugin_name, plugin_name);
2100
2101   GST_blacklist_test_allowed (peer, plugin_name, handle_connect_blacklist_cont, bcc);
2102 }
2103
2104
2105 /* end of file gnunet-service-transport_neighbours.c */