src/network/connectionthreads.cpp

   1 /*
   2 Minetest
   3 Copyright (C) 2013-2017 celeron55, Perttu Ahola <celeron55@gmail.com>
   4 Copyright (C) 2017 celeron55, Loic Blot <loic.blot@unix-experience.fr>
   5
   6 This program is free software; you can redistribute it and/or modify
   7 it under the terms of the GNU Lesser General Public License as published by
   8 the Free Software Foundation; either version 2.1 of the License, or
   9 (at your option) any later version.
  10
  11 This program is distributed in the hope that it will be useful,
  12 but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 GNU Lesser General Public License for more details.
  15
  16 You should have received a copy of the GNU Lesser General Public License along
  17 with this program; if not, write to the Free Software Foundation, Inc.,
  18 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  19 */
  20
  21 #include "connectionthreads.h"
  22 #include "log.h"
  23 #include "profiler.h"
  24 #include "settings.h"
  25 #include "network/networkpacket.h"
  26 #include "util/serialize.h"
  27
  28 namespace con
  29 {
  30
  31 /******************************************************************************/
  32 /* defines used for debugging and profiling                                   */
  33 /******************************************************************************/
  34 #ifdef NDEBUG
  35 #define LOG(a) a
  36 #define PROFILE(a)
  37 #undef DEBUG_CONNECTION_KBPS
  38 #else
  39 /* this mutex is used to achieve log message consistency */
  40 std::mutex log_conthread_mutex;
  41 #define LOG(a)                                                                \
  42         {                                                                         \
  43         MutexAutoLock loglock(log_conthread_mutex);                                 \
  44         a;                                                                        \
  45         }
  46 #define PROFILE(a) a
  47 //#define DEBUG_CONNECTION_KBPS
  48 #undef DEBUG_CONNECTION_KBPS
  49 #endif
  50
  51 /* maximum number of retries for reliable packets */
  52 #define MAX_RELIABLE_RETRY 5
  53
  54 #define WINDOW_SIZE 5
  55
  56 static session_t readPeerId(u8 *packetdata)
  57 {
  58         return readU16(&packetdata[4]);
  59 }
  60 static u8 readChannel(u8 *packetdata)
  61 {
  62         return readU8(&packetdata[6]);
  63 }
  64
  65 /******************************************************************************/
  66 /* Connection Threads                                                         */
  67 /******************************************************************************/
  68
  69 ConnectionSendThread::ConnectionSendThread(unsigned int max_packet_size,
  70         float timeout) :
  71         Thread("ConnectionSend"),
  72         m_max_packet_size(max_packet_size),
  73         m_timeout(timeout),
  74         m_max_data_packets_per_iteration(g_settings->getU16("max_packets_per_iteration"))
  75 {
  76         SANITY_CHECK(m_max_data_packets_per_iteration > 1);
  77 }
  78
  79 void *ConnectionSendThread::run()
  80 {
  81         assert(m_connection);
  82
  83         LOG(dout_con << m_connection->getDesc()
  84                 << "ConnectionSend thread started" << std::endl);
  85
  86         u64 curtime = porting::getTimeMs();
  87         u64 lasttime = curtime;
  88
  89         PROFILE(std::stringstream ThreadIdentifier);
  90         PROFILE(ThreadIdentifier << "ConnectionSend: [" << m_connection->getDesc() << "]");
  91
  92         /* if stop is requested don't stop immediately but try to send all        */
  93         /* packets first */
  94         while (!stopRequested() || packetsQueued()) {
  95                 BEGIN_DEBUG_EXCEPTION_HANDLER
  96                 PROFILE(ScopeProfiler sp(g_profiler, ThreadIdentifier.str(), SPT_AVG));
  97
  98                 m_iteration_packets_avaialble = m_max_data_packets_per_iteration;
  99
 100                 /* wait for trigger or timeout */
 101                 m_send_sleep_semaphore.wait(50);
 102
 103                 /* remove all triggers */
 104                 while (m_send_sleep_semaphore.wait(0)) {
 105                 }
 106
 107                 lasttime = curtime;
 108                 curtime = porting::getTimeMs();
 109                 float dtime = CALC_DTIME(lasttime, curtime);
 110
 111                 /* first resend timed-out packets */
 112                 runTimeouts(dtime);
 113                 if (m_iteration_packets_avaialble == 0) {
 114                         LOG(warningstream << m_connection->getDesc()
 115                                 << " Packet quota used up after re-sending packets, "
 116                                 << "max=" << m_max_data_packets_per_iteration << std::endl);
 117                 }
 118
 119                 /* translate commands to packets */
 120                 ConnectionCommand c = m_connection->m_command_queue.pop_frontNoEx(0);
 121                 while (c.type != CONNCMD_NONE) {
 122                         if (c.reliable)
 123                                 processReliableCommand(c);
 124                         else
 125                                 processNonReliableCommand(c);
 126
 127                         c = m_connection->m_command_queue.pop_frontNoEx(0);
 128                 }
 129
 130                 /* send queued packets */
 131                 sendPackets(dtime);
 132
 133                 END_DEBUG_EXCEPTION_HANDLER
 134         }
 135
 136         PROFILE(g_profiler->remove(ThreadIdentifier.str()));
 137         return NULL;
 138 }
 139
 140 void ConnectionSendThread::Trigger()
 141 {
 142         m_send_sleep_semaphore.post();
 143 }
 144
 145 bool ConnectionSendThread::packetsQueued()
 146 {
 147         std::list<session_t> peerIds = m_connection->getPeerIDs();
 148
 149         if (!m_outgoing_queue.empty() && !peerIds.empty())
 150                 return true;
 151
 152         for (session_t peerId : peerIds) {
 153                 PeerHelper peer = m_connection->getPeerNoEx(peerId);
 154
 155                 if (!peer)
 156                         continue;
 157
 158                 if (dynamic_cast<UDPPeer *>(&peer) == 0)
 159                         continue;
 160
 161                 for (Channel &channel : (dynamic_cast<UDPPeer *>(&peer))->channels) {
 162                         if (!channel.queued_commands.empty()) {
 163                                 return true;
 164                         }
 165                 }
 166         }
 167
 168
 169         return false;
 170 }
 171
 172 void ConnectionSendThread::runTimeouts(float dtime)
 173 {
 174         std::list<session_t> timeouted_peers;
 175         std::list<session_t> peerIds = m_connection->getPeerIDs();
 176
 177         for (session_t &peerId : peerIds) {
 178                 PeerHelper peer = m_connection->getPeerNoEx(peerId);
 179
 180                 if (!peer)
 181                         continue;
 182
 183                 UDPPeer *udpPeer = dynamic_cast<UDPPeer *>(&peer);
 184                 if (!udpPeer)
 185                         continue;
 186
 187                 PROFILE(std::stringstream peerIdentifier);
 188                 PROFILE(peerIdentifier << "runTimeouts[" << m_connection->getDesc()
 189                         << ";" << peerId << ";RELIABLE]");
 190                 PROFILE(ScopeProfiler
 191                 peerprofiler(g_profiler, peerIdentifier.str(), SPT_AVG));
 192
 193                 SharedBuffer<u8> data(2); // data for sending ping, required here because of goto
 194
 195                 /*
 196                         Check peer timeout
 197                 */
 198                 if (peer->isTimedOut(m_timeout)) {
 199                         infostream << m_connection->getDesc()
 200                                 << "RunTimeouts(): Peer " << peer->id
 201                                 << " has timed out."
 202                                 << std::endl;
 203                         // Add peer to the list
 204                         timeouted_peers.push_back(peer->id);
 205                         // Don't bother going through the buffers of this one
 206                         continue;
 207                 }
 208
 209                 float resend_timeout = udpPeer->getResendTimeout();
 210                 bool retry_count_exceeded = false;
 211                 for (Channel &channel : udpPeer->channels) {
 212                         std::list<BufferedPacket> timed_outs;
 213
 214                         // Remove timed out incomplete unreliable split packets
 215                         channel.incoming_splits.removeUnreliableTimedOuts(dtime, m_timeout);
 216
 217                         // Increment reliable packet times
 218                         channel.outgoing_reliables_sent.incrementTimeouts(dtime);
 219
 220                         unsigned int numpeers = m_connection->m_peers.size();
 221
 222                         if (numpeers == 0)
 223                                 return;
 224
 225                         // Re-send timed out outgoing reliables
 226                         timed_outs = channel.outgoing_reliables_sent.getTimedOuts(resend_timeout,
 227                                 (m_max_data_packets_per_iteration / numpeers));
 228
 229                         channel.UpdatePacketLossCounter(timed_outs.size());
 230                         g_profiler->graphAdd("packets_lost", timed_outs.size());
 231
 232                         m_iteration_packets_avaialble -= timed_outs.size();
 233
 234                         for (std::list<BufferedPacket>::iterator k = timed_outs.begin();
 235                                 k != timed_outs.end(); ++k) {
 236                                 session_t peer_id = readPeerId(*(k->data));
 237                                 u8 channelnum = readChannel(*(k->data));
 238                                 u16 seqnum = readU16(&(k->data[BASE_HEADER_SIZE + 1]));
 239
 240                                 channel.UpdateBytesLost(k->data.getSize());
 241                                 k->resend_count++;
 242
 243                                 if (k->resend_count > MAX_RELIABLE_RETRY) {
 244                                         retry_count_exceeded = true;
 245                                         timeouted_peers.push_back(peer->id);
 246                                         /* no need to check additional packets if a single one did timeout*/
 247                                         break;
 248                                 }
 249
 250                                 LOG(derr_con << m_connection->getDesc()
 251                                         << "RE-SENDING timed-out RELIABLE to "
 252                                         << k->address.serializeString()
 253                                         << "(t/o=" << resend_timeout << "): "
 254                                         << "from_peer_id=" << peer_id
 255                                         << ", channel=" << ((int) channelnum & 0xff)
 256                                         << ", seqnum=" << seqnum
 257                                         << std::endl);
 258
 259                                 rawSend(*k);
 260
 261                                 // do not handle rtt here as we can't decide if this packet was
 262                                 // lost or really takes more time to transmit
 263                         }
 264
 265                         if (retry_count_exceeded) {
 266                                 break; /* no need to check other channels if we already did timeout */
 267                         }
 268
 269                         channel.UpdateTimers(dtime);
 270                 }
 271
 272                 /* skip to next peer if we did timeout */
 273                 if (retry_count_exceeded)
 274                         continue;
 275
 276                 /* send ping if necessary */
 277                 if (udpPeer->Ping(dtime, data)) {
 278                         LOG(dout_con << m_connection->getDesc()
 279                                 << "Sending ping for peer_id: " << udpPeer->id << std::endl);
 280                         /* this may fail if there ain't a sequence number left */
 281                         if (!rawSendAsPacket(udpPeer->id, 0, data, true)) {
 282                                 //retrigger with reduced ping interval
 283                                 udpPeer->Ping(4.0, data);
 284                         }
 285                 }
 286
 287                 udpPeer->RunCommandQueues(m_max_packet_size,
 288                         m_max_commands_per_iteration,
 289                         m_max_packets_requeued);
 290         }
 291
 292         // Remove timed out peers
 293         for (u16 timeouted_peer : timeouted_peers) {
 294                 LOG(dout_con << m_connection->getDesc()
 295                         << "RunTimeouts(): Removing peer " << timeouted_peer << std::endl);
 296                 m_connection->deletePeer(timeouted_peer, true);
 297         }
 298 }
 299
 300 void ConnectionSendThread::rawSend(const BufferedPacket &packet)
 301 {
 302         try {
 303                 m_connection->m_udpSocket.Send(packet.address, *packet.data,
 304                         packet.data.getSize());
 305                 LOG(dout_con << m_connection->getDesc()
 306                         << " rawSend: " << packet.data.getSize()
 307                         << " bytes sent" << std::endl);
 308         } catch (SendFailedException &e) {
 309                 LOG(derr_con << m_connection->getDesc()
 310                         << "Connection::rawSend(): SendFailedException: "
 311                         << packet.address.serializeString() << std::endl);
 312         }
 313 }
 314
 315 void ConnectionSendThread::sendAsPacketReliable(BufferedPacket &p, Channel *channel)
 316 {
 317         try {
 318                 p.absolute_send_time = porting::getTimeMs();
 319                 // Buffer the packet
 320                 channel->outgoing_reliables_sent.insert(p,
 321                         (channel->readOutgoingSequenceNumber() - MAX_RELIABLE_WINDOW_SIZE)
 322                                 % (MAX_RELIABLE_WINDOW_SIZE + 1));
 323         }
 324         catch (AlreadyExistsException &e) {
 325                 LOG(derr_con << m_connection->getDesc()
 326                         << "WARNING: Going to send a reliable packet"
 327                         << " in outgoing buffer" << std::endl);
 328         }
 329
 330         // Send the packet
 331         rawSend(p);
 332 }
 333
 334 bool ConnectionSendThread::rawSendAsPacket(session_t peer_id, u8 channelnum,
 335         const SharedBuffer<u8> &data, bool reliable)
 336 {
 337         PeerHelper peer = m_connection->getPeerNoEx(peer_id);
 338         if (!peer) {
 339                 LOG(errorstream << m_connection->getDesc()
 340                         << " dropped " << (reliable ? "reliable " : "")
 341                         << "packet for non existent peer_id: " << peer_id << std::endl);
 342                 return false;
 343         }
 344         Channel *channel = &(dynamic_cast<UDPPeer *>(&peer)->channels[channelnum]);
 345
 346         if (reliable) {
 347                 bool have_sequence_number_for_raw_packet = true;
 348                 u16 seqnum =
 349                         channel->getOutgoingSequenceNumber(have_sequence_number_for_raw_packet);
 350
 351                 if (!have_sequence_number_for_raw_packet)
 352                         return false;
 353
 354                 SharedBuffer<u8> reliable = makeReliablePacket(data, seqnum);
 355                 Address peer_address;
 356                 peer->getAddress(MTP_MINETEST_RELIABLE_UDP, peer_address);
 357
 358                 // Add base headers and make a packet
 359                 BufferedPacket p = con::makePacket(peer_address, reliable,
 360                         m_connection->GetProtocolID(), m_connection->GetPeerID(),
 361                         channelnum);
 362
 363                 // first check if our send window is already maxed out
 364                 if (channel->outgoing_reliables_sent.size()
 365                         < channel->getWindowSize()) {
 366                         LOG(dout_con << m_connection->getDesc()
 367                                 << " INFO: sending a reliable packet to peer_id " << peer_id
 368                                 << " channel: " << (u32)channelnum
 369                                 << " seqnum: " << seqnum << std::endl);
 370                         sendAsPacketReliable(p, channel);
 371                         return true;
 372                 }
 373
 374                 LOG(dout_con << m_connection->getDesc()
 375                         << " INFO: queueing reliable packet for peer_id: " << peer_id
 376                         << " channel: " << (u32)channelnum
 377                         << " seqnum: " << seqnum << std::endl);
 378                 channel->queued_reliables.push(p);
 379                 return false;
 380         }
 381
 382         Address peer_address;
 383         if (peer->getAddress(MTP_UDP, peer_address)) {
 384                 // Add base headers and make a packet
 385                 BufferedPacket p = con::makePacket(peer_address, data,
 386                         m_connection->GetProtocolID(), m_connection->GetPeerID(),
 387                         channelnum);
 388
 389                 // Send the packet
 390                 rawSend(p);
 391                 return true;
 392         }
 393
 394         LOG(dout_con << m_connection->getDesc()
 395                 << " INFO: dropped unreliable packet for peer_id: " << peer_id
 396                 << " because of (yet) missing udp address" << std::endl);
 397         return false;
 398 }
 399
 400 void ConnectionSendThread::processReliableCommand(ConnectionCommand &c)
 401 {
 402         assert(c.reliable);  // Pre-condition
 403
 404         switch (c.type) {
 405                 case CONNCMD_NONE:
 406                         LOG(dout_con << m_connection->getDesc()
 407                                 << "UDP processing reliable CONNCMD_NONE" << std::endl);
 408                         return;
 409
 410                 case CONNCMD_SEND:
 411                         LOG(dout_con << m_connection->getDesc()
 412                                 << "UDP processing reliable CONNCMD_SEND" << std::endl);
 413                         sendReliable(c);
 414                         return;
 415
 416                 case CONNCMD_SEND_TO_ALL:
 417                         LOG(dout_con << m_connection->getDesc()
 418                                 << "UDP processing CONNCMD_SEND_TO_ALL" << std::endl);
 419                         sendToAllReliable(c);
 420                         return;
 421
 422                 case CONCMD_CREATE_PEER:
 423                         LOG(dout_con << m_connection->getDesc()
 424                                 << "UDP processing reliable CONCMD_CREATE_PEER" << std::endl);
 425                         if (!rawSendAsPacket(c.peer_id, c.channelnum, c.data, c.reliable)) {
 426                                 /* put to queue if we couldn't send it immediately */
 427                                 sendReliable(c);
 428                         }
 429                         return;
 430
 431                 case CONNCMD_SERVE:
 432                 case CONNCMD_CONNECT:
 433                 case CONNCMD_DISCONNECT:
 434                 case CONCMD_ACK:
 435                         FATAL_ERROR("Got command that shouldn't be reliable as reliable command");
 436                 default:
 437                         LOG(dout_con << m_connection->getDesc()
 438                                 << " Invalid reliable command type: " << c.type << std::endl);
 439         }
 440 }
 441
 442
 443 void ConnectionSendThread::processNonReliableCommand(ConnectionCommand &c)
 444 {
 445         assert(!c.reliable); // Pre-condition
 446
 447         switch (c.type) {
 448                 case CONNCMD_NONE:
 449                         LOG(dout_con << m_connection->getDesc()
 450                                 << " UDP processing CONNCMD_NONE" << std::endl);
 451                         return;
 452                 case CONNCMD_SERVE:
 453                         LOG(dout_con << m_connection->getDesc()
 454                                 << " UDP processing CONNCMD_SERVE port="
 455                                 << c.address.serializeString() << std::endl);
 456                         serve(c.address);
 457                         return;
 458                 case CONNCMD_CONNECT:
 459                         LOG(dout_con << m_connection->getDesc()
 460                                 << " UDP processing CONNCMD_CONNECT" << std::endl);
 461                         connect(c.address);
 462                         return;
 463                 case CONNCMD_DISCONNECT:
 464                         LOG(dout_con << m_connection->getDesc()
 465                                 << " UDP processing CONNCMD_DISCONNECT" << std::endl);
 466                         disconnect();
 467                         return;
 468                 case CONNCMD_DISCONNECT_PEER:
 469                         LOG(dout_con << m_connection->getDesc()
 470                                 << " UDP processing CONNCMD_DISCONNECT_PEER" << std::endl);
 471                         disconnect_peer(c.peer_id);
 472                         return;
 473                 case CONNCMD_SEND:
 474                         LOG(dout_con << m_connection->getDesc()
 475                                 << " UDP processing CONNCMD_SEND" << std::endl);
 476                         send(c.peer_id, c.channelnum, c.data);
 477                         return;
 478                 case CONNCMD_SEND_TO_ALL:
 479                         LOG(dout_con << m_connection->getDesc()
 480                                 << " UDP processing CONNCMD_SEND_TO_ALL" << std::endl);
 481                         sendToAll(c.channelnum, c.data);
 482                         return;
 483                 case CONCMD_ACK:
 484                         LOG(dout_con << m_connection->getDesc()
 485                                 << " UDP processing CONCMD_ACK" << std::endl);
 486                         sendAsPacket(c.peer_id, c.channelnum, c.data, true);
 487                         return;
 488                 case CONCMD_CREATE_PEER:
 489                         FATAL_ERROR("Got command that should be reliable as unreliable command");
 490                 default:
 491                         LOG(dout_con << m_connection->getDesc()
 492                                 << " Invalid command type: " << c.type << std::endl);
 493         }
 494 }
 495
 496 void ConnectionSendThread::serve(Address bind_address)
 497 {
 498         LOG(dout_con << m_connection->getDesc()
 499                 << "UDP serving at port " << bind_address.serializeString() << std::endl);
 500         try {
 501                 m_connection->m_udpSocket.Bind(bind_address);
 502                 m_connection->SetPeerID(PEER_ID_SERVER);
 503         }
 504         catch (SocketException &e) {
 505                 // Create event
 506                 ConnectionEvent ce;
 507                 ce.bindFailed();
 508                 m_connection->putEvent(ce);
 509         }
 510 }
 511
 512 void ConnectionSendThread::connect(Address address)
 513 {
 514         LOG(dout_con << m_connection->getDesc() << " connecting to "
 515                 << address.serializeString()
 516                 << ":" << address.getPort() << std::endl);
 517
 518         UDPPeer *peer = m_connection->createServerPeer(address);
 519
 520         // Create event
 521         ConnectionEvent e;
 522         e.peerAdded(peer->id, peer->address);
 523         m_connection->putEvent(e);
 524
 525         Address bind_addr;
 526
 527         if (address.isIPv6())
 528                 bind_addr.setAddress((IPv6AddressBytes *) NULL);
 529         else
 530                 bind_addr.setAddress(0, 0, 0, 0);
 531
 532         m_connection->m_udpSocket.Bind(bind_addr);
 533
 534         // Send a dummy packet to server with peer_id = PEER_ID_INEXISTENT
 535         m_connection->SetPeerID(PEER_ID_INEXISTENT);
 536         NetworkPacket pkt(0, 0);
 537         m_connection->Send(PEER_ID_SERVER, 0, &pkt, true);
 538 }
 539
 540 void ConnectionSendThread::disconnect()
 541 {
 542         LOG(dout_con << m_connection->getDesc() << " disconnecting" << std::endl);
 543
 544         // Create and send DISCO packet
 545         SharedBuffer<u8> data(2);
 546         writeU8(&data[0], PACKET_TYPE_CONTROL);
 547         writeU8(&data[1], CONTROLTYPE_DISCO);
 548
 549
 550         // Send to all
 551         std::list<session_t> peerids = m_connection->getPeerIDs();
 552
 553         for (session_t peerid : peerids) {
 554                 sendAsPacket(peerid, 0, data, false);
 555         }
 556 }
 557
 558 void ConnectionSendThread::disconnect_peer(session_t peer_id)
 559 {
 560         LOG(dout_con << m_connection->getDesc() << " disconnecting peer" << std::endl);
 561
 562         // Create and send DISCO packet
 563         SharedBuffer<u8> data(2);
 564         writeU8(&data[0], PACKET_TYPE_CONTROL);
 565         writeU8(&data[1], CONTROLTYPE_DISCO);
 566         sendAsPacket(peer_id, 0, data, false);
 567
 568         PeerHelper peer = m_connection->getPeerNoEx(peer_id);
 569
 570         if (!peer)
 571                 return;
 572
 573         if (dynamic_cast<UDPPeer *>(&peer) == 0) {
 574                 return;
 575         }
 576
 577         dynamic_cast<UDPPeer *>(&peer)->m_pending_disconnect = true;
 578 }
 579
 580 void ConnectionSendThread::send(session_t peer_id, u8 channelnum,
 581         const SharedBuffer<u8> &data)
 582 {
 583         assert(channelnum < CHANNEL_COUNT); // Pre-condition
 584
 585         PeerHelper peer = m_connection->getPeerNoEx(peer_id);
 586         if (!peer) {
 587                 LOG(dout_con << m_connection->getDesc() << " peer: peer_id=" << peer_id
 588                         << ">>>NOT<<< found on sending packet"
 589                         << ", channel " << (channelnum % 0xFF)
 590                         << ", size: " << data.getSize() << std::endl);
 591                 return;
 592         }
 593
 594         LOG(dout_con << m_connection->getDesc() << " sending to peer_id=" << peer_id
 595                 << ", channel " << (channelnum % 0xFF)
 596                 << ", size: " << data.getSize() << std::endl);
 597
 598         u16 split_sequence_number = peer->getNextSplitSequenceNumber(channelnum);
 599
 600         u32 chunksize_max = m_max_packet_size - BASE_HEADER_SIZE;
 601         std::list<SharedBuffer<u8>> originals;
 602
 603         makeAutoSplitPacket(data, chunksize_max, split_sequence_number, &originals);
 604
 605         peer->setNextSplitSequenceNumber(channelnum, split_sequence_number);
 606
 607         for (const SharedBuffer<u8> &original : originals) {
 608                 sendAsPacket(peer_id, channelnum, original);
 609         }
 610 }
 611
 612 void ConnectionSendThread::sendReliable(ConnectionCommand &c)
 613 {
 614         PeerHelper peer = m_connection->getPeerNoEx(c.peer_id);
 615         if (!peer)
 616                 return;
 617
 618         peer->PutReliableSendCommand(c, m_max_packet_size);
 619 }
 620
 621 void ConnectionSendThread::sendToAll(u8 channelnum, const SharedBuffer<u8> &data)
 622 {
 623         std::list<session_t> peerids = m_connection->getPeerIDs();
 624
 625         for (session_t peerid : peerids) {
 626                 send(peerid, channelnum, data);
 627         }
 628 }
 629
 630 void ConnectionSendThread::sendToAllReliable(ConnectionCommand &c)
 631 {
 632         std::list<session_t> peerids = m_connection->getPeerIDs();
 633
 634         for (session_t peerid : peerids) {
 635                 PeerHelper peer = m_connection->getPeerNoEx(peerid);
 636
 637                 if (!peer)
 638                         continue;
 639
 640                 peer->PutReliableSendCommand(c, m_max_packet_size);
 641         }
 642 }
 643
 644 void ConnectionSendThread::sendPackets(float dtime)
 645 {
 646         std::list<session_t> peerIds = m_connection->getPeerIDs();
 647         std::list<session_t> pendingDisconnect;
 648         std::map<session_t, bool> pending_unreliable;
 649
 650         const unsigned int peer_packet_quota = m_iteration_packets_avaialble
 651                 / MYMAX(peerIds.size(), 1);
 652
 653         for (session_t peerId : peerIds) {
 654                 PeerHelper peer = m_connection->getPeerNoEx(peerId);
 655                 //peer may have been removed
 656                 if (!peer) {
 657                         LOG(dout_con << m_connection->getDesc() << " Peer not found: peer_id="
 658                                 << peerId
 659                                 << std::endl);
 660                         continue;
 661                 }
 662                 peer->m_increment_packets_remaining = peer_packet_quota;
 663
 664                 UDPPeer *udpPeer = dynamic_cast<UDPPeer *>(&peer);
 665
 666                 if (!udpPeer) {
 667                         continue;
 668                 }
 669
 670                 if (udpPeer->m_pending_disconnect) {
 671                         pendingDisconnect.push_back(peerId);
 672                 }
 673
 674                 PROFILE(std::stringstream
 675                 peerIdentifier);
 676                 PROFILE(
 677                         peerIdentifier << "sendPackets[" << m_connection->getDesc() << ";" << peerId
 678                                 << ";RELIABLE]");
 679                 PROFILE(ScopeProfiler
 680                 peerprofiler(g_profiler, peerIdentifier.str(), SPT_AVG));
 681
 682                 LOG(dout_con << m_connection->getDesc()
 683                         << " Handle per peer queues: peer_id=" << peerId
 684                         << " packet quota: " << peer->m_increment_packets_remaining << std::endl);
 685
 686                 // first send queued reliable packets for all peers (if possible)
 687                 for (unsigned int i = 0; i < CHANNEL_COUNT; i++) {
 688                         Channel &channel = udpPeer->channels[i];
 689                         u16 next_to_ack = 0;
 690
 691                         channel.outgoing_reliables_sent.getFirstSeqnum(next_to_ack);
 692                         u16 next_to_receive = 0;
 693                         channel.incoming_reliables.getFirstSeqnum(next_to_receive);
 694
 695                         LOG(dout_con << m_connection->getDesc() << "\t channel: "
 696                                 << i << ", peer quota:"
 697                                 << peer->m_increment_packets_remaining
 698                                 << std::endl
 699                                 << "\t\t\treliables on wire: "
 700                                 << channel.outgoing_reliables_sent.size()
 701                                 << ", waiting for ack for " << next_to_ack
 702                                 << std::endl
 703                                 << "\t\t\tincoming_reliables: "
 704                                 << channel.incoming_reliables.size()
 705                                 << ", next reliable packet: "
 706                                 << channel.readNextIncomingSeqNum()
 707                                 << ", next queued: " << next_to_receive
 708                                 << std::endl
 709                                 << "\t\t\treliables queued : "
 710                                 << channel.queued_reliables.size()
 711                                 << std::endl
 712                                 << "\t\t\tqueued commands  : "
 713                                 << channel.queued_commands.size()
 714                                 << std::endl);
 715
 716                         while (!channel.queued_reliables.empty() &&
 717                                         channel.outgoing_reliables_sent.size()
 718                                         < channel.getWindowSize() &&
 719                                         peer->m_increment_packets_remaining > 0) {
 720                                 BufferedPacket p = channel.queued_reliables.front();
 721                                 channel.queued_reliables.pop();
 722                                 LOG(dout_con << m_connection->getDesc()
 723                                         << " INFO: sending a queued reliable packet "
 724                                         << " channel: " << i
 725                                         << ", seqnum: " << readU16(&p.data[BASE_HEADER_SIZE + 1])
 726                                         << std::endl);
 727                                 sendAsPacketReliable(p, &channel);
 728                                 peer->m_increment_packets_remaining--;
 729                         }
 730                 }
 731         }
 732
 733         if (!m_outgoing_queue.empty()) {
 734                 LOG(dout_con << m_connection->getDesc()
 735                         << " Handle non reliable queue ("
 736                         << m_outgoing_queue.size() << " pkts)" << std::endl);
 737         }
 738
 739         unsigned int initial_queuesize = m_outgoing_queue.size();
 740         /* send non reliable packets*/
 741         for (unsigned int i = 0; i < initial_queuesize; i++) {
 742                 OutgoingPacket packet = m_outgoing_queue.front();
 743                 m_outgoing_queue.pop();
 744
 745                 if (packet.reliable)
 746                         continue;
 747
 748                 PeerHelper peer = m_connection->getPeerNoEx(packet.peer_id);
 749                 if (!peer) {
 750                         LOG(dout_con << m_connection->getDesc()
 751                                 << " Outgoing queue: peer_id=" << packet.peer_id
 752                                 << ">>>NOT<<< found on sending packet"
 753                                 << ", channel " << (packet.channelnum % 0xFF)
 754                                 << ", size: " << packet.data.getSize() << std::endl);
 755                         continue;
 756                 }
 757
 758                 /* send acks immediately */
 759                 if (packet.ack || peer->m_increment_packets_remaining > 0 || stopRequested()) {
 760                         rawSendAsPacket(packet.peer_id, packet.channelnum,
 761                                 packet.data, packet.reliable);
 762                         if (peer->m_increment_packets_remaining > 0)
 763                                 peer->m_increment_packets_remaining--;
 764                 } else {
 765                         m_outgoing_queue.push(packet);
 766                         pending_unreliable[packet.peer_id] = true;
 767                 }
 768         }
 769
 770         if (peer_packet_quota > 0) {
 771                 for (session_t peerId : peerIds) {
 772                         PeerHelper peer = m_connection->getPeerNoEx(peerId);
 773                         if (!peer)
 774                                 continue;
 775                         if (peer->m_increment_packets_remaining == 0) {
 776                                 LOG(warningstream << m_connection->getDesc()
 777                                         << " Packet quota used up for peer_id=" << peerId
 778                                         << ", was " << peer_packet_quota << " pkts" << std::endl);
 779                         }
 780                 }
 781         }
 782
 783         for (session_t peerId : pendingDisconnect) {
 784                 if (!pending_unreliable[peerId]) {
 785                         m_connection->deletePeer(peerId, false);
 786                 }
 787         }
 788 }
 789
 790 void ConnectionSendThread::sendAsPacket(session_t peer_id, u8 channelnum,
 791         const SharedBuffer<u8> &data, bool ack)
 792 {
 793         OutgoingPacket packet(peer_id, channelnum, data, false, ack);
 794         m_outgoing_queue.push(packet);
 795 }
 796
 797 ConnectionReceiveThread::ConnectionReceiveThread(unsigned int max_packet_size) :
 798         Thread("ConnectionReceive")
 799 {
 800 }
 801
 802 void *ConnectionReceiveThread::run()
 803 {
 804         assert(m_connection);
 805
 806         LOG(dout_con << m_connection->getDesc()
 807                 << "ConnectionReceive thread started" << std::endl);
 808
 809         PROFILE(std::stringstream
 810         ThreadIdentifier);
 811         PROFILE(ThreadIdentifier << "ConnectionReceive: [" << m_connection->getDesc() << "]");
 812
 813         // use IPv6 minimum allowed MTU as receive buffer size as this is
 814         // theoretical reliable upper boundary of a udp packet for all IPv6 enabled
 815         // infrastructure
 816         const unsigned int packet_maxsize = 1500;
 817         SharedBuffer<u8> packetdata(packet_maxsize);
 818
 819         bool packet_queued = true;
 820
 821 #ifdef DEBUG_CONNECTION_KBPS
 822         u64 curtime = porting::getTimeMs();
 823         u64 lasttime = curtime;
 824         float debug_print_timer = 0.0;
 825 #endif
 826
 827         while (!stopRequested()) {
 828                 BEGIN_DEBUG_EXCEPTION_HANDLER
 829                 PROFILE(ScopeProfiler
 830                 sp(g_profiler, ThreadIdentifier.str(), SPT_AVG));
 831
 832 #ifdef DEBUG_CONNECTION_KBPS
 833                 lasttime = curtime;
 834                 curtime = porting::getTimeMs();
 835                 float dtime = CALC_DTIME(lasttime,curtime);
 836 #endif
 837
 838                 /* receive packets */
 839                 receive(packetdata, packet_queued);
 840
 841 #ifdef DEBUG_CONNECTION_KBPS
 842                 debug_print_timer += dtime;
 843                 if (debug_print_timer > 20.0) {
 844                         debug_print_timer -= 20.0;
 845
 846                         std::list<session_t> peerids = m_connection->getPeerIDs();
 847
 848                         for (std::list<session_t>::iterator i = peerids.begin();
 849                                         i != peerids.end();
 850                                         i++)
 851                         {
 852                                 PeerHelper peer = m_connection->getPeerNoEx(*i);
 853                                 if (!peer)
 854                                         continue;
 855
 856                                 float peer_current = 0.0;
 857                                 float peer_loss = 0.0;
 858                                 float avg_rate = 0.0;
 859                                 float avg_loss = 0.0;
 860
 861                                 for(u16 j=0; j<CHANNEL_COUNT; j++)
 862                                 {
 863                                         peer_current +=peer->channels[j].getCurrentDownloadRateKB();
 864                                         peer_loss += peer->channels[j].getCurrentLossRateKB();
 865                                         avg_rate += peer->channels[j].getAvgDownloadRateKB();
 866                                         avg_loss += peer->channels[j].getAvgLossRateKB();
 867                                 }
 868
 869                                 std::stringstream output;
 870                                 output << std::fixed << std::setprecision(1);
 871                                 output << "OUT to Peer " << *i << " RATES (good / loss) " << std::endl;
 872                                 output << "\tcurrent (sum): " << peer_current << "kb/s "<< peer_loss << "kb/s" << std::endl;
 873                                 output << "\taverage (sum): " << avg_rate << "kb/s "<< avg_loss << "kb/s" << std::endl;
 874                                 output << std::setfill(' ');
 875                                 for(u16 j=0; j<CHANNEL_COUNT; j++)
 876                                 {
 877                                         output << "\tcha " << j << ":"
 878                                                 << " CUR: " << std::setw(6) << peer->channels[j].getCurrentDownloadRateKB() <<"kb/s"
 879                                                 << " AVG: " << std::setw(6) << peer->channels[j].getAvgDownloadRateKB() <<"kb/s"
 880                                                 << " MAX: " << std::setw(6) << peer->channels[j].getMaxDownloadRateKB() <<"kb/s"
 881                                                 << " /"
 882                                                 << " CUR: " << std::setw(6) << peer->channels[j].getCurrentLossRateKB() <<"kb/s"
 883                                                 << " AVG: " << std::setw(6) << peer->channels[j].getAvgLossRateKB() <<"kb/s"
 884                                                 << " MAX: " << std::setw(6) << peer->channels[j].getMaxLossRateKB() <<"kb/s"
 885                                                 << " / WS: " << peer->channels[j].getWindowSize()
 886                                                 << std::endl;
 887                                 }
 888
 889                                 fprintf(stderr,"%s\n",output.str().c_str());
 890                         }
 891                 }
 892 #endif
 893                 END_DEBUG_EXCEPTION_HANDLER
 894         }
 895
 896         PROFILE(g_profiler->remove(ThreadIdentifier.str()));
 897         return NULL;
 898 }
 899
 900 // Receive packets from the network and buffers and create ConnectionEvents
 901 void ConnectionReceiveThread::receive(SharedBuffer<u8> &packetdata,
 902                 bool &packet_queued)
 903 {
 904         try {
 905                 // First, see if there any buffered packets we can process now
 906                 if (packet_queued) {
 907                         bool data_left = true;
 908                         session_t peer_id;
 909                         SharedBuffer<u8> resultdata;
 910                         while (data_left) {
 911                                 try {
 912                                         data_left = getFromBuffers(peer_id, resultdata);
 913                                         if (data_left) {
 914                                                 ConnectionEvent e;
 915                                                 e.dataReceived(peer_id, resultdata);
 916                                                 m_connection->putEvent(e);
 917                                         }
 918                                 }
 919                                 catch (ProcessedSilentlyException &e) {
 920                                         /* try reading again */
 921                                 }
 922                         }
 923                         packet_queued = false;
 924                 }
 925
 926                 // Call Receive() to wait for incoming data
 927                 Address sender;
 928                 s32 received_size = m_connection->m_udpSocket.Receive(sender,
 929                         *packetdata, packetdata.getSize());
 930                 if (received_size < 0)
 931                         return;
 932
 933                 if ((received_size < BASE_HEADER_SIZE) ||
 934                         (readU32(&packetdata[0]) != m_connection->GetProtocolID())) {
 935                         LOG(derr_con << m_connection->getDesc()
 936                                 << "Receive(): Invalid incoming packet, "
 937                                 << "size: " << received_size
 938                                 << ", protocol: "
 939                                 << ((received_size >= 4) ? readU32(&packetdata[0]) : -1)
 940                                 << std::endl);
 941                         return;
 942                 }
 943
 944                 session_t peer_id = readPeerId(*packetdata);
 945                 u8 channelnum = readChannel(*packetdata);
 946
 947                 if (channelnum > CHANNEL_COUNT - 1) {
 948                         LOG(derr_con << m_connection->getDesc()
 949                                 << "Receive(): Invalid channel " << (u32)channelnum << std::endl);
 950                         return;
 951                 }
 952
 953                 /* Try to identify peer by sender address (may happen on join) */
 954                 if (peer_id == PEER_ID_INEXISTENT) {
 955                         peer_id = m_connection->lookupPeer(sender);
 956                         // We do not have to remind the peer of its
 957                         // peer id as the CONTROLTYPE_SET_PEER_ID
 958                         // command was sent reliably.
 959                 }
 960
 961                 /* The peer was not found in our lists. Add it. */
 962                 if (peer_id == PEER_ID_INEXISTENT) {
 963                         peer_id = m_connection->createPeer(sender, MTP_MINETEST_RELIABLE_UDP, 0);
 964                 }
 965
 966                 PeerHelper peer = m_connection->getPeerNoEx(peer_id);
 967                 if (!peer) {
 968                         LOG(dout_con << m_connection->getDesc()
 969                                 << " got packet from unknown peer_id: "
 970                                 << peer_id << " Ignoring." << std::endl);
 971                         return;
 972                 }
 973
 974                 // Validate peer address
 975
 976                 Address peer_address;
 977                 if (peer->getAddress(MTP_UDP, peer_address)) {
 978                         if (peer_address != sender) {
 979                                 LOG(derr_con << m_connection->getDesc()
 980                                         << " Peer " << peer_id << " sending from different address."
 981                                         " Ignoring." << std::endl);
 982                                 return;
 983                         }
 984                 } else {
 985                         LOG(derr_con << m_connection->getDesc()
 986                                 << " Peer " << peer_id << " doesn't have an address?!"
 987                                 " Ignoring." << std::endl);
 988                         return;
 989                 }
 990
 991                 peer->ResetTimeout();
 992
 993                 Channel *channel = nullptr;
 994                 if (dynamic_cast<UDPPeer *>(&peer)) {
 995                         channel = &dynamic_cast<UDPPeer *>(&peer)->channels[channelnum];
 996                 } else {
 997                         LOG(derr_con << m_connection->getDesc()
 998                                 << "Receive(): peer_id=" << peer_id << " isn't an UDPPeer?!"
 999                                 " Ignoring." << std::endl);
1000                         return;
1001                 }
1002
1003                 channel->UpdateBytesReceived(received_size);
1004
1005                 // Throw the received packet to channel->processPacket()
1006
1007                 // Make a new SharedBuffer from the data without the base headers
1008                 SharedBuffer<u8> strippeddata(received_size - BASE_HEADER_SIZE);
1009                 memcpy(*strippeddata, &packetdata[BASE_HEADER_SIZE],
1010                         strippeddata.getSize());
1011
1012                 try {
1013                         // Process it (the result is some data with no headers made by us)
1014                         SharedBuffer<u8> resultdata = processPacket
1015                                 (channel, strippeddata, peer_id, channelnum, false);
1016
1017                         LOG(dout_con << m_connection->getDesc()
1018                                 << " ProcessPacket from peer_id: " << peer_id
1019                                 << ", channel: " << (u32)channelnum << ", returned "
1020                                 << resultdata.getSize() << " bytes" << std::endl);
1021
1022                         ConnectionEvent e;
1023                         e.dataReceived(peer_id, resultdata);
1024                         m_connection->putEvent(e);
1025                 }
1026                 catch (ProcessedSilentlyException &e) {
1027                 }
1028                 catch (ProcessedQueued &e) {
1029                         // we set it to true anyway (see below)
1030                 }
1031
1032                 /* Every time we receive a packet it can happen that a previously
1033                  * buffered packet is now ready to process. */
1034                 packet_queued = true;
1035         }
1036         catch (InvalidIncomingDataException &e) {
1037         }
1038 }
1039
1040 bool ConnectionReceiveThread::getFromBuffers(session_t &peer_id, SharedBuffer<u8> &dst)
1041 {
1042         std::list<session_t> peerids = m_connection->getPeerIDs();
1043
1044         for (session_t peerid : peerids) {
1045                 PeerHelper peer = m_connection->getPeerNoEx(peerid);
1046                 if (!peer)
1047                         continue;
1048
1049                 if (dynamic_cast<UDPPeer *>(&peer) == 0)
1050                         continue;
1051
1052                 for (Channel &channel : (dynamic_cast<UDPPeer *>(&peer))->channels) {
1053                         if (checkIncomingBuffers(&channel, peer_id, dst)) {
1054                                 return true;
1055                         }
1056                 }
1057         }
1058         return false;
1059 }
1060
1061 bool ConnectionReceiveThread::checkIncomingBuffers(Channel *channel,
1062         session_t &peer_id, SharedBuffer<u8> &dst)
1063 {
1064         u16 firstseqnum = 0;
1065         if (channel->incoming_reliables.getFirstSeqnum(firstseqnum)) {
1066                 if (firstseqnum == channel->readNextIncomingSeqNum()) {
1067                         BufferedPacket p = channel->incoming_reliables.popFirst();
1068                         peer_id = readPeerId(*p.data);
1069                         u8 channelnum = readChannel(*p.data);
1070                         u16 seqnum = readU16(&p.data[BASE_HEADER_SIZE + 1]);
1071
1072                         LOG(dout_con << m_connection->getDesc()
1073                                 << "UNBUFFERING TYPE_RELIABLE"
1074                                 << " seqnum=" << seqnum
1075                                 << " peer_id=" << peer_id
1076                                 << " channel=" << ((int) channelnum & 0xff)
1077                                 << std::endl);
1078
1079                         channel->incNextIncomingSeqNum();
1080
1081                         u32 headers_size = BASE_HEADER_SIZE + RELIABLE_HEADER_SIZE;
1082                         // Get out the inside packet and re-process it
1083                         SharedBuffer<u8> payload(p.data.getSize() - headers_size);
1084                         memcpy(*payload, &p.data[headers_size], payload.getSize());
1085
1086                         dst = processPacket(channel, payload, peer_id, channelnum, true);
1087                         return true;
1088                 }
1089         }
1090         return false;
1091 }
1092
1093 SharedBuffer<u8> ConnectionReceiveThread::processPacket(Channel *channel,
1094         const SharedBuffer<u8> &packetdata, session_t peer_id, u8 channelnum, bool reliable)
1095 {
1096         PeerHelper peer = m_connection->getPeerNoEx(peer_id);
1097
1098         if (!peer) {
1099                 errorstream << "Peer not found (possible timeout)" << std::endl;
1100                 throw ProcessedSilentlyException("Peer not found (possible timeout)");
1101         }
1102
1103         if (packetdata.getSize() < 1)
1104                 throw InvalidIncomingDataException("packetdata.getSize() < 1");
1105
1106         u8 type = readU8(&(packetdata[0]));
1107
1108         if (MAX_UDP_PEERS <= 65535 && peer_id >= MAX_UDP_PEERS) {
1109                 std::string errmsg = "Invalid peer_id=" + itos(peer_id);
1110                 errorstream << errmsg << std::endl;
1111                 throw InvalidIncomingDataException(errmsg.c_str());
1112         }
1113
1114         if (type >= PACKET_TYPE_MAX) {
1115                 derr_con << m_connection->getDesc() << "Got invalid type=" << ((int) type & 0xff)
1116                         << std::endl;
1117                 throw InvalidIncomingDataException("Invalid packet type");
1118         }
1119
1120         const PacketTypeHandler &pHandle = packetTypeRouter[type];
1121         return (this->*pHandle.handler)(channel, packetdata, &peer, channelnum, reliable);
1122 }
1123
1124 const ConnectionReceiveThread::PacketTypeHandler
1125         ConnectionReceiveThread::packetTypeRouter[PACKET_TYPE_MAX] = {
1126         {&ConnectionReceiveThread::handlePacketType_Control},
1127         {&ConnectionReceiveThread::handlePacketType_Original},
1128         {&ConnectionReceiveThread::handlePacketType_Split},
1129         {&ConnectionReceiveThread::handlePacketType_Reliable},
1130 };
1131
1132 SharedBuffer<u8> ConnectionReceiveThread::handlePacketType_Control(Channel *channel,
1133         const SharedBuffer<u8> &packetdata, Peer *peer, u8 channelnum, bool reliable)
1134 {
1135         if (packetdata.getSize() < 2)
1136                 throw InvalidIncomingDataException("packetdata.getSize() < 2");
1137
1138         u8 controltype = readU8(&(packetdata[1]));
1139
1140         if (controltype == CONTROLTYPE_ACK) {
1141                 assert(channel != NULL);
1142
1143                 if (packetdata.getSize() < 4) {
1144                         throw InvalidIncomingDataException(
1145                                 "packetdata.getSize() < 4 (ACK header size)");
1146                 }
1147
1148                 u16 seqnum = readU16(&packetdata[2]);
1149                 LOG(dout_con << m_connection->getDesc() << " [ CONTROLTYPE_ACK: channelnum="
1150                         << ((int) channelnum & 0xff) << ", peer_id=" << peer->id << ", seqnum="
1151                         << seqnum << " ]" << std::endl);
1152
1153                 try {
1154                         BufferedPacket p = channel->outgoing_reliables_sent.popSeqnum(seqnum);
1155
1156                         // only calculate rtt from straight sent packets
1157                         if (p.resend_count == 0) {
1158                                 // Get round trip time
1159                                 u64 current_time = porting::getTimeMs();
1160
1161                                 // a overflow is quite unlikely but as it'd result in major
1162                                 // rtt miscalculation we handle it here
1163                                 if (current_time > p.absolute_send_time) {
1164                                         float rtt = (current_time - p.absolute_send_time) / 1000.0;
1165
1166                                         // Let peer calculate stuff according to it
1167                                         // (avg_rtt and resend_timeout)
1168                                         dynamic_cast<UDPPeer *>(peer)->reportRTT(rtt);
1169                                 } else if (p.totaltime > 0) {
1170                                         float rtt = p.totaltime;
1171
1172                                         // Let peer calculate stuff according to it
1173                                         // (avg_rtt and resend_timeout)
1174                                         dynamic_cast<UDPPeer *>(peer)->reportRTT(rtt);
1175                                 }
1176                         }
1177                         // put bytes for max bandwidth calculation
1178                         channel->UpdateBytesSent(p.data.getSize(), 1);
1179                         if (channel->outgoing_reliables_sent.size() == 0)
1180                                 m_connection->TriggerSend();
1181                 } catch (NotFoundException &e) {
1182                         LOG(derr_con << m_connection->getDesc()
1183                                 << "WARNING: ACKed packet not in outgoing queue"
1184                                 << " seqnum=" << seqnum << std::endl);
1185                         channel->UpdatePacketTooLateCounter();
1186                 }
1187
1188                 throw ProcessedSilentlyException("Got an ACK");
1189         } else if (controltype == CONTROLTYPE_SET_PEER_ID) {
1190                 // Got a packet to set our peer id
1191                 if (packetdata.getSize() < 4)
1192                         throw InvalidIncomingDataException
1193                                 ("packetdata.getSize() < 4 (SET_PEER_ID header size)");
1194                 session_t peer_id_new = readU16(&packetdata[2]);
1195                 LOG(dout_con << m_connection->getDesc() << "Got new peer id: " << peer_id_new
1196                         << "... " << std::endl);
1197
1198                 if (m_connection->GetPeerID() != PEER_ID_INEXISTENT) {
1199                         LOG(derr_con << m_connection->getDesc()
1200                                 << "WARNING: Not changing existing peer id." << std::endl);
1201                 } else {
1202                         LOG(dout_con << m_connection->getDesc() << "changing own peer id"
1203                                 << std::endl);
1204                         m_connection->SetPeerID(peer_id_new);
1205                 }
1206
1207                 throw ProcessedSilentlyException("Got a SET_PEER_ID");
1208         } else if (controltype == CONTROLTYPE_PING) {
1209                 // Just ignore it, the incoming data already reset
1210                 // the timeout counter
1211                 LOG(dout_con << m_connection->getDesc() << "PING" << std::endl);
1212                 throw ProcessedSilentlyException("Got a PING");
1213         } else if (controltype == CONTROLTYPE_DISCO) {
1214                 // Just ignore it, the incoming data already reset
1215                 // the timeout counter
1216                 LOG(dout_con << m_connection->getDesc() << "DISCO: Removing peer "
1217                         << peer->id << std::endl);
1218
1219                 if (!m_connection->deletePeer(peer->id, false)) {
1220                         derr_con << m_connection->getDesc() << "DISCO: Peer not found" << std::endl;
1221                 }
1222
1223                 throw ProcessedSilentlyException("Got a DISCO");
1224         } else {
1225                 LOG(derr_con << m_connection->getDesc()
1226                         << "INVALID TYPE_CONTROL: invalid controltype="
1227                         << ((int) controltype & 0xff) << std::endl);
1228                 throw InvalidIncomingDataException("Invalid control type");
1229         }
1230 }
1231
1232 SharedBuffer<u8> ConnectionReceiveThread::handlePacketType_Original(Channel *channel,
1233         const SharedBuffer<u8> &packetdata, Peer *peer, u8 channelnum, bool reliable)
1234 {
1235         if (packetdata.getSize() <= ORIGINAL_HEADER_SIZE)
1236                 throw InvalidIncomingDataException
1237                         ("packetdata.getSize() <= ORIGINAL_HEADER_SIZE");
1238         LOG(dout_con << m_connection->getDesc() << "RETURNING TYPE_ORIGINAL to user"
1239                 << std::endl);
1240         // Get the inside packet out and return it
1241         SharedBuffer<u8> payload(packetdata.getSize() - ORIGINAL_HEADER_SIZE);
1242         memcpy(*payload, &(packetdata[ORIGINAL_HEADER_SIZE]), payload.getSize());
1243         return payload;
1244 }
1245
1246 SharedBuffer<u8> ConnectionReceiveThread::handlePacketType_Split(Channel *channel,
1247         const SharedBuffer<u8> &packetdata, Peer *peer, u8 channelnum, bool reliable)
1248 {
1249         Address peer_address;
1250
1251         if (peer->getAddress(MTP_UDP, peer_address)) {
1252                 // We have to create a packet again for buffering
1253                 // This isn't actually too bad an idea.
1254                 BufferedPacket packet = makePacket(peer_address,
1255                         packetdata,
1256                         m_connection->GetProtocolID(),
1257                         peer->id,
1258                         channelnum);
1259
1260                 // Buffer the packet
1261                 SharedBuffer<u8> data = peer->addSplitPacket(channelnum, packet, reliable);
1262
1263                 if (data.getSize() != 0) {
1264                         LOG(dout_con << m_connection->getDesc()
1265                                 << "RETURNING TYPE_SPLIT: Constructed full data, "
1266                                 << "size=" << data.getSize() << std::endl);
1267                         return data;
1268                 }
1269                 LOG(dout_con << m_connection->getDesc() << "BUFFERED TYPE_SPLIT" << std::endl);
1270                 throw ProcessedSilentlyException("Buffered a split packet chunk");
1271         }
1272
1273         // We should never get here.
1274         FATAL_ERROR("Invalid execution point");
1275 }
1276
1277 SharedBuffer<u8> ConnectionReceiveThread::handlePacketType_Reliable(Channel *channel,
1278         const SharedBuffer<u8> &packetdata, Peer *peer, u8 channelnum, bool reliable)
1279 {
1280         assert(channel != NULL);
1281
1282         // Recursive reliable packets not allowed
1283         if (reliable)
1284                 throw InvalidIncomingDataException("Found nested reliable packets");
1285
1286         if (packetdata.getSize() < RELIABLE_HEADER_SIZE)
1287                 throw InvalidIncomingDataException("packetdata.getSize() < RELIABLE_HEADER_SIZE");
1288
1289         u16 seqnum = readU16(&packetdata[1]);
1290         bool is_future_packet = false;
1291         bool is_old_packet = false;
1292
1293         /* packet is within our receive window send ack */
1294         if (seqnum_in_window(seqnum,
1295                 channel->readNextIncomingSeqNum(), MAX_RELIABLE_WINDOW_SIZE)) {
1296                 m_connection->sendAck(peer->id, channelnum, seqnum);
1297         } else {
1298                 is_future_packet = seqnum_higher(seqnum, channel->readNextIncomingSeqNum());
1299                 is_old_packet = seqnum_higher(channel->readNextIncomingSeqNum(), seqnum);
1300
1301                 /* packet is not within receive window, don't send ack.           *
1302                  * if this was a valid packet it's gonna be retransmitted         */
1303                 if (is_future_packet)
1304                         throw ProcessedSilentlyException(
1305                                 "Received packet newer then expected, not sending ack");
1306
1307                 /* seems like our ack was lost, send another one for a old packet */
1308                 if (is_old_packet) {
1309                         LOG(dout_con << m_connection->getDesc()
1310                                 << "RE-SENDING ACK: peer_id: " << peer->id
1311                                 << ", channel: " << (channelnum & 0xFF)
1312                                 << ", seqnum: " << seqnum << std::endl;)
1313                         m_connection->sendAck(peer->id, channelnum, seqnum);
1314
1315                         // we already have this packet so this one was on wire at least
1316                         // the current timeout
1317                         // we don't know how long this packet was on wire don't do silly guessing
1318                         // dynamic_cast<UDPPeer*>(&peer)->
1319                         //     reportRTT(dynamic_cast<UDPPeer*>(&peer)->getResendTimeout());
1320
1321                         throw ProcessedSilentlyException("Retransmitting ack for old packet");
1322                 }
1323         }
1324
1325         if (seqnum != channel->readNextIncomingSeqNum()) {
1326                 Address peer_address;
1327
1328                 // this is a reliable packet so we have a udp address for sure
1329                 peer->getAddress(MTP_MINETEST_RELIABLE_UDP, peer_address);
1330                 // This one comes later, buffer it.
1331                 // Actually we have to make a packet to buffer one.
1332                 // Well, we have all the ingredients, so just do it.
1333                 BufferedPacket packet = con::makePacket(
1334                         peer_address,
1335                         packetdata,
1336                         m_connection->GetProtocolID(),
1337                         peer->id,
1338                         channelnum);
1339                 try {
1340                         channel->incoming_reliables.insert(packet, channel->readNextIncomingSeqNum());
1341
1342                         LOG(dout_con << m_connection->getDesc()
1343                                 << "BUFFERING, TYPE_RELIABLE peer_id: " << peer->id
1344                                 << ", channel: " << (channelnum & 0xFF)
1345                                 << ", seqnum: " << seqnum << std::endl;)
1346
1347                         throw ProcessedQueued("Buffered future reliable packet");
1348                 } catch (AlreadyExistsException &e) {
1349                 } catch (IncomingDataCorruption &e) {
1350                         ConnectionCommand discon;
1351                         discon.disconnect_peer(peer->id);
1352                         m_connection->putCommand(discon);
1353
1354                         LOG(derr_con << m_connection->getDesc()
1355                                 << "INVALID, TYPE_RELIABLE peer_id: " << peer->id
1356                                 << ", channel: " << (channelnum & 0xFF)
1357                                 << ", seqnum: " << seqnum
1358                                 << "DROPPING CLIENT!" << std::endl;)
1359                 }
1360         }
1361
1362         /* we got a packet to process right now */
1363         LOG(dout_con << m_connection->getDesc()
1364                 << "RECURSIVE, TYPE_RELIABLE peer_id: " << peer->id
1365                 << ", channel: " << (channelnum & 0xFF)
1366                 << ", seqnum: " << seqnum << std::endl;)
1367
1368
1369         /* check for resend case */
1370         u16 queued_seqnum = 0;
1371         if (channel->incoming_reliables.getFirstSeqnum(queued_seqnum)) {
1372                 if (queued_seqnum == seqnum) {
1373                         BufferedPacket queued_packet = channel->incoming_reliables.popFirst();
1374                         /** TODO find a way to verify the new against the old packet */
1375                 }
1376         }
1377
1378         channel->incNextIncomingSeqNum();
1379
1380         // Get out the inside packet and re-process it
1381         SharedBuffer<u8> payload(packetdata.getSize() - RELIABLE_HEADER_SIZE);
1382         memcpy(*payload, &packetdata[RELIABLE_HEADER_SIZE], payload.getSize());
1383
1384         return processPacket(channel, payload, peer->id, channelnum, true);
1385 }
1386
1387 }