src/network/connection.cpp

   1 /*
   2 Minetest
   3 Copyright (C) 2013 celeron55, Perttu Ahola <celeron55@gmail.com>
   4
   5 This program is free software; you can redistribute it and/or modify
   6 it under the terms of the GNU Lesser General Public License as published by
   7 the Free Software Foundation; either version 2.1 of the License, or
   8 (at your option) any later version.
   9
  10 This program is distributed in the hope that it will be useful,
  11 but WITHOUT ANY WARRANTY; without even the implied warranty of
  12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13 GNU Lesser General Public License for more details.
  14
  15 You should have received a copy of the GNU Lesser General Public License along
  16 with this program; if not, write to the Free Software Foundation, Inc.,
  17 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  18 */
  19
  20 #include <iomanip>
  21 #include <errno.h>
  22 #include "connection.h"
  23 #include "main.h"
  24 #include "serialization.h"
  25 #include "log.h"
  26 #include "porting.h"
  27 #include "util/serialize.h"
  28 #include "util/numeric.h"
  29 #include "util/string.h"
  30 #include "settings.h"
  31 #include "profiler.h"
  32
  33 namespace con
  34 {
  35
  36 /******************************************************************************/
  37 /* defines used for debugging and profiling                                   */
  38 /******************************************************************************/
  39 #ifdef NDEBUG
  40 #define LOG(a) a
  41 #define PROFILE(a)
  42 #undef DEBUG_CONNECTION_KBPS
  43 #else
  44 /* this mutex is used to achieve log message consistency */
  45 JMutex log_message_mutex;
  46 #define LOG(a)                                                                 \
  47         {                                                                          \
  48         JMutexAutoLock loglock(log_message_mutex);                                 \
  49         a;                                                                         \
  50         }
  51 #define PROFILE(a) a
  52 //#define DEBUG_CONNECTION_KBPS
  53 #undef DEBUG_CONNECTION_KBPS
  54 #endif
  55
  56
  57 static inline float CALC_DTIME(unsigned int lasttime, unsigned int curtime) {
  58         float value = ( curtime - lasttime) / 1000.0;
  59         return MYMAX(MYMIN(value,0.1),0.0);
  60 }
  61
  62 /* maximum window size to use, 0xFFFF is theoretical maximum  don't think about
  63  * touching it, the less you're away from it the more likely data corruption
  64  * will occur
  65  */
  66 #define MAX_RELIABLE_WINDOW_SIZE 0x8000
  67  /* starting value for window size */
  68 #define MIN_RELIABLE_WINDOW_SIZE 0x40
  69
  70 #define MAX_UDP_PEERS 65535
  71
  72 #define PING_TIMEOUT 5.0
  73
  74 static u16 readPeerId(u8 *packetdata)
  75 {
  76         return readU16(&packetdata[4]);
  77 }
  78 static u8 readChannel(u8 *packetdata)
  79 {
  80         return readU8(&packetdata[6]);
  81 }
  82
  83 BufferedPacket makePacket(Address &address, u8 *data, u32 datasize,
  84                 u32 protocol_id, u16 sender_peer_id, u8 channel)
  85 {
  86         u32 packet_size = datasize + BASE_HEADER_SIZE;
  87         BufferedPacket p(packet_size);
  88         p.address = address;
  89
  90         writeU32(&p.data[0], protocol_id);
  91         writeU16(&p.data[4], sender_peer_id);
  92         writeU8(&p.data[6], channel);
  93
  94         memcpy(&p.data[BASE_HEADER_SIZE], data, datasize);
  95
  96         return p;
  97 }
  98
  99 BufferedPacket makePacket(Address &address, SharedBuffer<u8> &data,
 100                 u32 protocol_id, u16 sender_peer_id, u8 channel)
 101 {
 102         return makePacket(address, *data, data.getSize(),
 103                         protocol_id, sender_peer_id, channel);
 104 }
 105
 106 SharedBuffer<u8> makeOriginalPacket(
 107                 SharedBuffer<u8> data)
 108 {
 109         u32 header_size = 1;
 110         u32 packet_size = data.getSize() + header_size;
 111         SharedBuffer<u8> b(packet_size);
 112
 113         writeU8(&(b[0]), TYPE_ORIGINAL);
 114         if (data.getSize() > 0) {
 115                 memcpy(&(b[header_size]), *data, data.getSize());
 116         }
 117         return b;
 118 }
 119
 120 std::list<SharedBuffer<u8> > makeSplitPacket(
 121                 SharedBuffer<u8> data,
 122                 u32 chunksize_max,
 123                 u16 seqnum)
 124 {
 125         // Chunk packets, containing the TYPE_SPLIT header
 126         std::list<SharedBuffer<u8> > chunks;
 127
 128         u32 chunk_header_size = 7;
 129         u32 maximum_data_size = chunksize_max - chunk_header_size;
 130         u32 start = 0;
 131         u32 end = 0;
 132         u32 chunk_num = 0;
 133         u16 chunk_count = 0;
 134         do{
 135                 end = start + maximum_data_size - 1;
 136                 if (end > data.getSize() - 1)
 137                         end = data.getSize() - 1;
 138
 139                 u32 payload_size = end - start + 1;
 140                 u32 packet_size = chunk_header_size + payload_size;
 141
 142                 SharedBuffer<u8> chunk(packet_size);
 143
 144                 writeU8(&chunk[0], TYPE_SPLIT);
 145                 writeU16(&chunk[1], seqnum);
 146                 // [3] u16 chunk_count is written at next stage
 147                 writeU16(&chunk[5], chunk_num);
 148                 memcpy(&chunk[chunk_header_size], &data[start], payload_size);
 149
 150                 chunks.push_back(chunk);
 151                 chunk_count++;
 152
 153                 start = end + 1;
 154                 chunk_num++;
 155         }
 156         while(end != data.getSize() - 1);
 157
 158         for(std::list<SharedBuffer<u8> >::iterator i = chunks.begin();
 159                 i != chunks.end(); ++i)
 160         {
 161                 // Write chunk_count
 162                 writeU16(&((*i)[3]), chunk_count);
 163         }
 164
 165         return chunks;
 166 }
 167
 168 std::list<SharedBuffer<u8> > makeAutoSplitPacket(
 169                 SharedBuffer<u8> data,
 170                 u32 chunksize_max,
 171                 u16 &split_seqnum)
 172 {
 173         u32 original_header_size = 1;
 174         std::list<SharedBuffer<u8> > list;
 175         if (data.getSize() + original_header_size > chunksize_max)
 176         {
 177                 list = makeSplitPacket(data, chunksize_max, split_seqnum);
 178                 split_seqnum++;
 179                 return list;
 180         }
 181         else
 182         {
 183                 list.push_back(makeOriginalPacket(data));
 184         }
 185         return list;
 186 }
 187
 188 SharedBuffer<u8> makeReliablePacket(
 189                 SharedBuffer<u8> data,
 190                 u16 seqnum)
 191 {
 192         u32 header_size = 3;
 193         u32 packet_size = data.getSize() + header_size;
 194         SharedBuffer<u8> b(packet_size);
 195
 196         writeU8(&b[0], TYPE_RELIABLE);
 197         writeU16(&b[1], seqnum);
 198
 199         memcpy(&b[header_size], *data, data.getSize());
 200
 201         return b;
 202 }
 203
 204 /*
 205         ReliablePacketBuffer
 206 */
 207
 208 ReliablePacketBuffer::ReliablePacketBuffer(): m_list_size(0) {}
 209
 210 void ReliablePacketBuffer::print()
 211 {
 212         JMutexAutoLock listlock(m_list_mutex);
 213         LOG(dout_con<<"Dump of ReliablePacketBuffer:" << std::endl);
 214         unsigned int index = 0;
 215         for(std::list<BufferedPacket>::iterator i = m_list.begin();
 216                 i != m_list.end();
 217                 ++i)
 218         {
 219                 u16 s = readU16(&(i->data[BASE_HEADER_SIZE+1]));
 220                 LOG(dout_con<<index<< ":" << s << std::endl);
 221                 index++;
 222         }
 223 }
 224 bool ReliablePacketBuffer::empty()
 225 {
 226         JMutexAutoLock listlock(m_list_mutex);
 227         return m_list.empty();
 228 }
 229
 230 u32 ReliablePacketBuffer::size()
 231 {
 232         return m_list_size;
 233 }
 234
 235 bool ReliablePacketBuffer::containsPacket(u16 seqnum)
 236 {
 237         return !(findPacket(seqnum) == m_list.end());
 238 }
 239
 240 RPBSearchResult ReliablePacketBuffer::findPacket(u16 seqnum)
 241 {
 242         std::list<BufferedPacket>::iterator i = m_list.begin();
 243         for(; i != m_list.end(); ++i)
 244         {
 245                 u16 s = readU16(&(i->data[BASE_HEADER_SIZE+1]));
 246                 /*dout_con<<"findPacket(): finding seqnum="<<seqnum
 247                                 <<", comparing to s="<<s<<std::endl;*/
 248                 if (s == seqnum)
 249                         break;
 250         }
 251         return i;
 252 }
 253 RPBSearchResult ReliablePacketBuffer::notFound()
 254 {
 255         return m_list.end();
 256 }
 257 bool ReliablePacketBuffer::getFirstSeqnum(u16& result)
 258 {
 259         JMutexAutoLock listlock(m_list_mutex);
 260         if (m_list.empty())
 261                 return false;
 262         BufferedPacket p = *m_list.begin();
 263         result = readU16(&p.data[BASE_HEADER_SIZE+1]);
 264         return true;
 265 }
 266
 267 BufferedPacket ReliablePacketBuffer::popFirst()
 268 {
 269         JMutexAutoLock listlock(m_list_mutex);
 270         if (m_list.empty())
 271                 throw NotFoundException("Buffer is empty");
 272         BufferedPacket p = *m_list.begin();
 273         m_list.erase(m_list.begin());
 274         --m_list_size;
 275
 276         if (m_list_size == 0) {
 277                 m_oldest_non_answered_ack = 0;
 278         } else {
 279                 m_oldest_non_answered_ack =
 280                                 readU16(&(*m_list.begin()).data[BASE_HEADER_SIZE+1]);
 281         }
 282         return p;
 283 }
 284 BufferedPacket ReliablePacketBuffer::popSeqnum(u16 seqnum)
 285 {
 286         JMutexAutoLock listlock(m_list_mutex);
 287         RPBSearchResult r = findPacket(seqnum);
 288         if (r == notFound()) {
 289                 LOG(dout_con<<"Sequence number: " << seqnum
 290                                 << " not found in reliable buffer"<<std::endl);
 291                 throw NotFoundException("seqnum not found in buffer");
 292         }
 293         BufferedPacket p = *r;
 294
 295
 296         RPBSearchResult next = r;
 297         next++;
 298         if (next != notFound()) {
 299                 u16 s = readU16(&(next->data[BASE_HEADER_SIZE+1]));
 300                 m_oldest_non_answered_ack = s;
 301         }
 302
 303         m_list.erase(r);
 304         --m_list_size;
 305
 306         if (m_list_size == 0)
 307         { m_oldest_non_answered_ack = 0; }
 308         else
 309         { m_oldest_non_answered_ack = readU16(&(*m_list.begin()).data[BASE_HEADER_SIZE+1]);     }
 310         return p;
 311 }
 312 void ReliablePacketBuffer::insert(BufferedPacket &p,u16 next_expected)
 313 {
 314         JMutexAutoLock listlock(m_list_mutex);
 315         assert(p.data.getSize() >= BASE_HEADER_SIZE+3);
 316         u8 type = readU8(&p.data[BASE_HEADER_SIZE+0]);
 317         assert(type == TYPE_RELIABLE);
 318         u16 seqnum = readU16(&p.data[BASE_HEADER_SIZE+1]);
 319
 320         assert(seqnum_in_window(seqnum,next_expected,MAX_RELIABLE_WINDOW_SIZE));
 321         assert(seqnum != next_expected);
 322
 323         ++m_list_size;
 324         assert(m_list_size <= SEQNUM_MAX+1);
 325
 326         // Find the right place for the packet and insert it there
 327         // If list is empty, just add it
 328         if (m_list.empty())
 329         {
 330                 m_list.push_back(p);
 331                 m_oldest_non_answered_ack = seqnum;
 332                 // Done.
 333                 return;
 334         }
 335
 336         // Otherwise find the right place
 337         std::list<BufferedPacket>::iterator i = m_list.begin();
 338         // Find the first packet in the list which has a higher seqnum
 339         u16 s = readU16(&(i->data[BASE_HEADER_SIZE+1]));
 340
 341         /* case seqnum is smaller then next_expected seqnum */
 342         /* this is true e.g. on wrap around */
 343         if (seqnum < next_expected) {
 344                 while(((s < seqnum) || (s >= next_expected)) && (i != m_list.end())) {
 345                         i++;
 346                         if (i != m_list.end())
 347                                 s = readU16(&(i->data[BASE_HEADER_SIZE+1]));
 348                 }
 349         }
 350         /* non wrap around case (at least for incoming and next_expected */
 351         else
 352         {
 353                 while(((s < seqnum) && (s >= next_expected)) && (i != m_list.end())) {
 354                         i++;
 355                         if (i != m_list.end())
 356                                 s = readU16(&(i->data[BASE_HEADER_SIZE+1]));
 357                 }
 358         }
 359
 360         if (s == seqnum) {
 361                 if (
 362                         (readU16(&(i->data[BASE_HEADER_SIZE+1])) != seqnum) ||
 363                         (i->data.getSize() != p.data.getSize()) ||
 364                         (i->address != p.address)
 365                         )
 366                 {
 367                         /* if this happens your maximum transfer window may be to big */
 368                         fprintf(stderr,
 369                                         "Duplicated seqnum %d non matching packet detected:\n",
 370                                         seqnum);
 371                         fprintf(stderr, "Old: seqnum: %05d size: %04d, address: %s\n",
 372                                         readU16(&(i->data[BASE_HEADER_SIZE+1])),i->data.getSize(),
 373                                         i->address.serializeString().c_str());
 374                         fprintf(stderr, "New: seqnum: %05d size: %04u, address: %s\n",
 375                                         readU16(&(p.data[BASE_HEADER_SIZE+1])),p.data.getSize(),
 376                                         p.address.serializeString().c_str());
 377                         throw IncomingDataCorruption("duplicated packet isn't same as original one");
 378                 }
 379
 380                 assert(readU16(&(i->data[BASE_HEADER_SIZE+1])) == seqnum);
 381                 assert(i->data.getSize() == p.data.getSize());
 382                 assert(i->address == p.address);
 383
 384                 /* nothing to do this seems to be a resent packet */
 385                 /* for paranoia reason data should be compared */
 386                 --m_list_size;
 387         }
 388         /* insert or push back */
 389         else if (i != m_list.end()) {
 390                 m_list.insert(i, p);
 391         }
 392         else {
 393                 m_list.push_back(p);
 394         }
 395
 396         /* update last packet number */
 397         m_oldest_non_answered_ack = readU16(&(*m_list.begin()).data[BASE_HEADER_SIZE+1]);
 398 }
 399
 400 void ReliablePacketBuffer::incrementTimeouts(float dtime)
 401 {
 402         JMutexAutoLock listlock(m_list_mutex);
 403         for(std::list<BufferedPacket>::iterator i = m_list.begin();
 404                 i != m_list.end(); ++i)
 405         {
 406                 i->time += dtime;
 407                 i->totaltime += dtime;
 408         }
 409 }
 410
 411 std::list<BufferedPacket> ReliablePacketBuffer::getTimedOuts(float timeout,
 412                                                                                                         unsigned int max_packets)
 413 {
 414         JMutexAutoLock listlock(m_list_mutex);
 415         std::list<BufferedPacket> timed_outs;
 416         for(std::list<BufferedPacket>::iterator i = m_list.begin();
 417                 i != m_list.end(); ++i)
 418         {
 419                 if (i->time >= timeout) {
 420                         timed_outs.push_back(*i);
 421
 422                         //this packet will be sent right afterwards reset timeout here
 423                         i->time = 0.0;
 424                         if (timed_outs.size() >= max_packets)
 425                                 break;
 426                 }
 427         }
 428         return timed_outs;
 429 }
 430
 431 /*
 432         IncomingSplitBuffer
 433 */
 434
 435 IncomingSplitBuffer::~IncomingSplitBuffer()
 436 {
 437         JMutexAutoLock listlock(m_map_mutex);
 438         for(std::map<u16, IncomingSplitPacket*>::iterator i = m_buf.begin();
 439                 i != m_buf.end(); ++i)
 440         {
 441                 delete i->second;
 442         }
 443 }
 444 /*
 445         This will throw a GotSplitPacketException when a full
 446         split packet is constructed.
 447 */
 448 SharedBuffer<u8> IncomingSplitBuffer::insert(BufferedPacket &p, bool reliable)
 449 {
 450         JMutexAutoLock listlock(m_map_mutex);
 451         u32 headersize = BASE_HEADER_SIZE + 7;
 452         assert(p.data.getSize() >= headersize);
 453         u8 type = readU8(&p.data[BASE_HEADER_SIZE+0]);
 454         assert(type == TYPE_SPLIT);
 455         u16 seqnum = readU16(&p.data[BASE_HEADER_SIZE+1]);
 456         u16 chunk_count = readU16(&p.data[BASE_HEADER_SIZE+3]);
 457         u16 chunk_num = readU16(&p.data[BASE_HEADER_SIZE+5]);
 458
 459         // Add if doesn't exist
 460         if (m_buf.find(seqnum) == m_buf.end())
 461         {
 462                 IncomingSplitPacket *sp = new IncomingSplitPacket();
 463                 sp->chunk_count = chunk_count;
 464                 sp->reliable = reliable;
 465                 m_buf[seqnum] = sp;
 466         }
 467
 468         IncomingSplitPacket *sp = m_buf[seqnum];
 469
 470         // TODO: These errors should be thrown or something? Dunno.
 471         if (chunk_count != sp->chunk_count)
 472                 LOG(derr_con<<"Connection: WARNING: chunk_count="<<chunk_count
 473                                 <<" != sp->chunk_count="<<sp->chunk_count
 474                                 <<std::endl);
 475         if (reliable != sp->reliable)
 476                 LOG(derr_con<<"Connection: WARNING: reliable="<<reliable
 477                                 <<" != sp->reliable="<<sp->reliable
 478                                 <<std::endl);
 479
 480         // If chunk already exists, ignore it.
 481         // Sometimes two identical packets may arrive when there is network
 482         // lag and the server re-sends stuff.
 483         if (sp->chunks.find(chunk_num) != sp->chunks.end())
 484                 return SharedBuffer<u8>();
 485
 486         // Cut chunk data out of packet
 487         u32 chunkdatasize = p.data.getSize() - headersize;
 488         SharedBuffer<u8> chunkdata(chunkdatasize);
 489         memcpy(*chunkdata, &(p.data[headersize]), chunkdatasize);
 490
 491         // Set chunk data in buffer
 492         sp->chunks[chunk_num] = chunkdata;
 493
 494         // If not all chunks are received, return empty buffer
 495         if (sp->allReceived() == false)
 496                 return SharedBuffer<u8>();
 497
 498         // Calculate total size
 499         u32 totalsize = 0;
 500         for(std::map<u16, SharedBuffer<u8> >::iterator i = sp->chunks.begin();
 501                 i != sp->chunks.end(); ++i)
 502         {
 503                 totalsize += i->second.getSize();
 504         }
 505
 506         SharedBuffer<u8> fulldata(totalsize);
 507
 508         // Copy chunks to data buffer
 509         u32 start = 0;
 510         for(u32 chunk_i=0; chunk_i<sp->chunk_count;
 511                         chunk_i++)
 512         {
 513                 SharedBuffer<u8> buf = sp->chunks[chunk_i];
 514                 u16 chunkdatasize = buf.getSize();
 515                 memcpy(&fulldata[start], *buf, chunkdatasize);
 516                 start += chunkdatasize;;
 517         }
 518
 519         // Remove sp from buffer
 520         m_buf.erase(seqnum);
 521         delete sp;
 522
 523         return fulldata;
 524 }
 525 void IncomingSplitBuffer::removeUnreliableTimedOuts(float dtime, float timeout)
 526 {
 527         std::list<u16> remove_queue;
 528         {
 529                 JMutexAutoLock listlock(m_map_mutex);
 530                 for(std::map<u16, IncomingSplitPacket*>::iterator i = m_buf.begin();
 531                         i != m_buf.end(); ++i)
 532                 {
 533                         IncomingSplitPacket *p = i->second;
 534                         // Reliable ones are not removed by timeout
 535                         if (p->reliable == true)
 536                                 continue;
 537                         p->time += dtime;
 538                         if (p->time >= timeout)
 539                                 remove_queue.push_back(i->first);
 540                 }
 541         }
 542         for(std::list<u16>::iterator j = remove_queue.begin();
 543                 j != remove_queue.end(); ++j)
 544         {
 545                 JMutexAutoLock listlock(m_map_mutex);
 546                 LOG(dout_con<<"NOTE: Removing timed out unreliable split packet"<<std::endl);
 547                 delete m_buf[*j];
 548                 m_buf.erase(*j);
 549         }
 550 }
 551
 552 /*
 553         Channel
 554 */
 555
 556 Channel::Channel() :
 557                 window_size(MIN_RELIABLE_WINDOW_SIZE),
 558                 next_incoming_seqnum(SEQNUM_INITIAL),
 559                 next_outgoing_seqnum(SEQNUM_INITIAL),
 560                 next_outgoing_split_seqnum(SEQNUM_INITIAL),
 561                 current_packet_loss(0),
 562                 current_packet_too_late(0),
 563                 current_packet_successfull(0),
 564                 packet_loss_counter(0),
 565                 current_bytes_transfered(0),
 566                 current_bytes_received(0),
 567                 current_bytes_lost(0),
 568                 max_kbps(0.0),
 569                 cur_kbps(0.0),
 570                 avg_kbps(0.0),
 571                 max_incoming_kbps(0.0),
 572                 cur_incoming_kbps(0.0),
 573                 avg_incoming_kbps(0.0),
 574                 max_kbps_lost(0.0),
 575                 cur_kbps_lost(0.0),
 576                 avg_kbps_lost(0.0),
 577                 bpm_counter(0.0),
 578                 rate_samples(0)
 579 {
 580 }
 581
 582 Channel::~Channel()
 583 {
 584 }
 585
 586 u16 Channel::readNextIncomingSeqNum()
 587 {
 588         JMutexAutoLock internal(m_internal_mutex);
 589         return next_incoming_seqnum;
 590 }
 591
 592 u16 Channel::incNextIncomingSeqNum()
 593 {
 594         JMutexAutoLock internal(m_internal_mutex);
 595         u16 retval = next_incoming_seqnum;
 596         next_incoming_seqnum++;
 597         return retval;
 598 }
 599
 600 u16 Channel::readNextSplitSeqNum()
 601 {
 602         JMutexAutoLock internal(m_internal_mutex);
 603         return next_outgoing_split_seqnum;
 604 }
 605 void Channel::setNextSplitSeqNum(u16 seqnum)
 606 {
 607         JMutexAutoLock internal(m_internal_mutex);
 608         next_outgoing_split_seqnum = seqnum;
 609 }
 610
 611 u16 Channel::getOutgoingSequenceNumber(bool& successfull)
 612 {
 613         JMutexAutoLock internal(m_internal_mutex);
 614         u16 retval = next_outgoing_seqnum;
 615         u16 lowest_unacked_seqnumber;
 616
 617         /* shortcut if there ain't any packet in outgoing list */
 618         if (outgoing_reliables_sent.empty())
 619         {
 620                 next_outgoing_seqnum++;
 621                 return retval;
 622         }
 623
 624         if (outgoing_reliables_sent.getFirstSeqnum(lowest_unacked_seqnumber))
 625         {
 626                 if (lowest_unacked_seqnumber < next_outgoing_seqnum) {
 627                         // ugly cast but this one is required in order to tell compiler we
 628                         // know about difference of two unsigned may be negative in general
 629                         // but we already made sure it won't happen in this case
 630                         if (((u16)(next_outgoing_seqnum - lowest_unacked_seqnumber)) > window_size) {
 631                                 successfull = false;
 632                                 return 0;
 633                         }
 634                 }
 635                 else {
 636                         // ugly cast but this one is required in order to tell compiler we
 637                         // know about difference of two unsigned may be negative in general
 638                         // but we already made sure it won't happen in this case
 639                         if ((next_outgoing_seqnum + (u16)(SEQNUM_MAX - lowest_unacked_seqnumber)) >
 640                                 window_size) {
 641                                 successfull = false;
 642                                 return 0;
 643                         }
 644                 }
 645         }
 646
 647         next_outgoing_seqnum++;
 648         return retval;
 649 }
 650
 651 u16 Channel::readOutgoingSequenceNumber()
 652 {
 653         JMutexAutoLock internal(m_internal_mutex);
 654         return next_outgoing_seqnum;
 655 }
 656
 657 bool Channel::putBackSequenceNumber(u16 seqnum)
 658 {
 659         if (((seqnum + 1) % (SEQNUM_MAX+1)) == next_outgoing_seqnum) {
 660
 661                 next_outgoing_seqnum = seqnum;
 662                 return true;
 663         }
 664         return false;
 665 }
 666
 667 void Channel::UpdateBytesSent(unsigned int bytes, unsigned int packets)
 668 {
 669         JMutexAutoLock internal(m_internal_mutex);
 670         current_bytes_transfered += bytes;
 671         current_packet_successfull += packets;
 672 }
 673
 674 void Channel::UpdateBytesReceived(unsigned int bytes) {
 675         JMutexAutoLock internal(m_internal_mutex);
 676         current_bytes_received += bytes;
 677 }
 678
 679 void Channel::UpdateBytesLost(unsigned int bytes)
 680 {
 681         JMutexAutoLock internal(m_internal_mutex);
 682         current_bytes_lost += bytes;
 683 }
 684
 685
 686 void Channel::UpdatePacketLossCounter(unsigned int count)
 687 {
 688         JMutexAutoLock internal(m_internal_mutex);
 689         current_packet_loss += count;
 690 }
 691
 692 void Channel::UpdatePacketTooLateCounter()
 693 {
 694         JMutexAutoLock internal(m_internal_mutex);
 695         current_packet_too_late++;
 696 }
 697
 698 void Channel::UpdateTimers(float dtime,bool legacy_peer)
 699 {
 700         bpm_counter += dtime;
 701         packet_loss_counter += dtime;
 702
 703         if (packet_loss_counter > 1.0)
 704         {
 705                 packet_loss_counter -= 1.0;
 706
 707                 unsigned int packet_loss = 11; /* use a neutral value for initialization */
 708                 unsigned int packets_successfull = 0;
 709                 //unsigned int packet_too_late = 0;
 710
 711                 bool reasonable_amount_of_data_transmitted = false;
 712
 713                 {
 714                         JMutexAutoLock internal(m_internal_mutex);
 715                         packet_loss = current_packet_loss;
 716                         //packet_too_late = current_packet_too_late;
 717                         packets_successfull = current_packet_successfull;
 718
 719                         if (current_bytes_transfered > (unsigned int) (window_size*512/2))
 720                         {
 721                                 reasonable_amount_of_data_transmitted = true;
 722                         }
 723                         current_packet_loss = 0;
 724                         current_packet_too_late = 0;
 725                         current_packet_successfull = 0;
 726                 }
 727
 728                 /* dynamic window size is only available for non legacy peers */
 729                 if (!legacy_peer) {
 730                         float successfull_to_lost_ratio = 0.0;
 731                         bool done = false;
 732
 733                         if (packets_successfull > 0) {
 734                                 successfull_to_lost_ratio = packet_loss/packets_successfull;
 735                         }
 736                         else if (packet_loss > 0)
 737                         {
 738                                 window_size = MYMAX(
 739                                                 (window_size - 10),
 740                                                 MIN_RELIABLE_WINDOW_SIZE);
 741                                 done = true;
 742                         }
 743
 744                         if (!done)
 745                         {
 746                                 if ((successfull_to_lost_ratio < 0.01) &&
 747                                         (window_size < MAX_RELIABLE_WINDOW_SIZE))
 748                                 {
 749                                         /* don't even think about increasing if we didn't even
 750                                          * use major parts of our window */
 751                                         if (reasonable_amount_of_data_transmitted)
 752                                                 window_size = MYMIN(
 753                                                                 (window_size + 100),
 754                                                                 MAX_RELIABLE_WINDOW_SIZE);
 755                                 }
 756                                 else if ((successfull_to_lost_ratio < 0.05) &&
 757                                                 (window_size < MAX_RELIABLE_WINDOW_SIZE))
 758                                 {
 759                                         /* don't even think about increasing if we didn't even
 760                                          * use major parts of our window */
 761                                         if (reasonable_amount_of_data_transmitted)
 762                                                 window_size = MYMIN(
 763                                                                 (window_size + 50),
 764                                                                 MAX_RELIABLE_WINDOW_SIZE);
 765                                 }
 766                                 else if (successfull_to_lost_ratio > 0.15)
 767                                 {
 768                                         window_size = MYMAX(
 769                                                         (window_size - 100),
 770                                                         MIN_RELIABLE_WINDOW_SIZE);
 771                                 }
 772                                 else if (successfull_to_lost_ratio > 0.1)
 773                                 {
 774                                         window_size = MYMAX(
 775                                                         (window_size - 50),
 776                                                         MIN_RELIABLE_WINDOW_SIZE);
 777                                 }
 778                         }
 779                 }
 780         }
 781
 782         if (bpm_counter > 10.0)
 783         {
 784                 {
 785                         JMutexAutoLock internal(m_internal_mutex);
 786                         cur_kbps                 =
 787                                         (((float) current_bytes_transfered)/bpm_counter)/1024.0;
 788                         current_bytes_transfered = 0;
 789                         cur_kbps_lost            =
 790                                         (((float) current_bytes_lost)/bpm_counter)/1024.0;
 791                         current_bytes_lost       = 0;
 792                         cur_incoming_kbps        =
 793                                         (((float) current_bytes_received)/bpm_counter)/1024.0;
 794                         current_bytes_received   = 0;
 795                         bpm_counter              = 0;
 796                 }
 797
 798                 if (cur_kbps > max_kbps)
 799                 {
 800                         max_kbps = cur_kbps;
 801                 }
 802
 803                 if (cur_kbps_lost > max_kbps_lost)
 804                 {
 805                         max_kbps_lost = cur_kbps_lost;
 806                 }
 807
 808                 if (cur_incoming_kbps > max_incoming_kbps) {
 809                         max_incoming_kbps = cur_incoming_kbps;
 810                 }
 811
 812                 rate_samples       = MYMIN(rate_samples+1,10);
 813                 float old_fraction = ((float) (rate_samples-1) )/( (float) rate_samples);
 814                 avg_kbps           = avg_kbps * old_fraction +
 815                                 cur_kbps * (1.0 - old_fraction);
 816                 avg_kbps_lost      = avg_kbps_lost * old_fraction +
 817                                 cur_kbps_lost * (1.0 - old_fraction);
 818                 avg_incoming_kbps  = avg_incoming_kbps * old_fraction +
 819                                 cur_incoming_kbps * (1.0 - old_fraction);
 820         }
 821 }
 822
 823
 824 /*
 825         Peer
 826 */
 827
 828 PeerHelper::PeerHelper() :
 829         m_peer(0)
 830 {}
 831
 832 PeerHelper::PeerHelper(Peer* peer) :
 833         m_peer(peer)
 834 {
 835         if (peer != NULL)
 836         {
 837                 if (!peer->IncUseCount())
 838                 {
 839                         m_peer = 0;
 840                 }
 841         }
 842 }
 843
 844 PeerHelper::~PeerHelper()
 845 {
 846         if (m_peer != 0)
 847                 m_peer->DecUseCount();
 848
 849         m_peer = 0;
 850 }
 851
 852 PeerHelper& PeerHelper::operator=(Peer* peer)
 853 {
 854         m_peer = peer;
 855         if (peer != NULL)
 856         {
 857                 if (!peer->IncUseCount())
 858                 {
 859                         m_peer = 0;
 860                 }
 861         }
 862         return *this;
 863 }
 864
 865 Peer* PeerHelper::operator->() const
 866 {
 867         return m_peer;
 868 }
 869
 870 Peer* PeerHelper::operator&() const
 871 {
 872         return m_peer;
 873 }
 874
 875 bool PeerHelper::operator!() {
 876         return ! m_peer;
 877 }
 878
 879 bool PeerHelper::operator!=(void* ptr)
 880 {
 881         return ((void*) m_peer != ptr);
 882 }
 883
 884 bool Peer::IncUseCount()
 885 {
 886         JMutexAutoLock lock(m_exclusive_access_mutex);
 887
 888         if (!m_pending_deletion)
 889         {
 890                 this->m_usage++;
 891                 return true;
 892         }
 893
 894         return false;
 895 }
 896
 897 void Peer::DecUseCount()
 898 {
 899         {
 900                 JMutexAutoLock lock(m_exclusive_access_mutex);
 901                 assert(m_usage > 0);
 902                 m_usage--;
 903
 904                 if (!((m_pending_deletion) && (m_usage == 0)))
 905                         return;
 906         }
 907         delete this;
 908 }
 909
 910 void Peer::RTTStatistics(float rtt, std::string profiler_id,
 911                 unsigned int num_samples) {
 912
 913         if (m_last_rtt > 0) {
 914                 /* set min max values */
 915                 if (rtt < m_rtt.min_rtt)
 916                         m_rtt.min_rtt = rtt;
 917                 if (rtt >= m_rtt.max_rtt)
 918                         m_rtt.max_rtt = rtt;
 919
 920                 /* do average calculation */
 921                 if (m_rtt.avg_rtt < 0.0)
 922                         m_rtt.avg_rtt  = rtt;
 923                 else
 924                         m_rtt.avg_rtt  = m_rtt.avg_rtt * (num_samples/(num_samples-1)) +
 925                                                                 rtt * (1/num_samples);
 926
 927                 /* do jitter calculation */
 928
 929                 //just use some neutral value at beginning
 930                 float jitter = m_rtt.jitter_min;
 931
 932                 if (rtt > m_last_rtt)
 933                         jitter = rtt-m_last_rtt;
 934
 935                 if (rtt <= m_last_rtt)
 936                         jitter = m_last_rtt - rtt;
 937
 938                 if (jitter < m_rtt.jitter_min)
 939                         m_rtt.jitter_min = jitter;
 940                 if (jitter >= m_rtt.jitter_max)
 941                         m_rtt.jitter_max = jitter;
 942
 943                 if (m_rtt.jitter_avg < 0.0)
 944                         m_rtt.jitter_avg  = jitter;
 945                 else
 946                         m_rtt.jitter_avg  = m_rtt.jitter_avg * (num_samples/(num_samples-1)) +
 947                                                                 jitter * (1/num_samples);
 948
 949                 if (profiler_id != "")
 950                 {
 951                         g_profiler->graphAdd(profiler_id + "_rtt", rtt);
 952                         g_profiler->graphAdd(profiler_id + "_jitter", jitter);
 953                 }
 954         }
 955         /* save values required for next loop */
 956         m_last_rtt = rtt;
 957 }
 958
 959 bool Peer::isTimedOut(float timeout)
 960 {
 961         JMutexAutoLock lock(m_exclusive_access_mutex);
 962         u32 current_time = porting::getTimeMs();
 963
 964         float dtime = CALC_DTIME(m_last_timeout_check,current_time);
 965         m_last_timeout_check = current_time;
 966
 967         m_timeout_counter += dtime;
 968
 969         return m_timeout_counter > timeout;
 970 }
 971
 972 void Peer::Drop()
 973 {
 974         {
 975                 JMutexAutoLock usage_lock(m_exclusive_access_mutex);
 976                 m_pending_deletion = true;
 977                 if (m_usage != 0)
 978                         return;
 979         }
 980
 981         PROFILE(std::stringstream peerIdentifier1);
 982         PROFILE(peerIdentifier1 << "runTimeouts[" << m_connection->getDesc()
 983                         << ";" << id << ";RELIABLE]");
 984         PROFILE(g_profiler->remove(peerIdentifier1.str()));
 985         PROFILE(std::stringstream peerIdentifier2);
 986         PROFILE(peerIdentifier2 << "sendPackets[" << m_connection->getDesc()
 987                         << ";" << id << ";RELIABLE]");
 988         PROFILE(ScopeProfiler peerprofiler(g_profiler, peerIdentifier2.str(), SPT_AVG));
 989
 990         delete this;
 991 }
 992
 993 UDPPeer::UDPPeer(u16 a_id, Address a_address, Connection* connection) :
 994         Peer(a_address,a_id,connection),
 995         m_pending_disconnect(false),
 996         resend_timeout(0.5),
 997         m_legacy_peer(true)
 998 {
 999 }
1000
1001 bool UDPPeer::getAddress(MTProtocols type,Address& toset)
1002 {
1003         if ((type == MTP_UDP) || (type == MTP_MINETEST_RELIABLE_UDP) || (type == MTP_PRIMARY))
1004         {
1005                 toset = address;
1006                 return true;
1007         }
1008
1009         return false;
1010 }
1011
1012 void UDPPeer::setNonLegacyPeer()
1013 {
1014         m_legacy_peer = false;
1015         for(unsigned int i=0; i< CHANNEL_COUNT; i++)
1016         {
1017                 channels->setWindowSize(g_settings->getU16("max_packets_per_iteration"));
1018         }
1019 }
1020
1021 void UDPPeer::reportRTT(float rtt)
1022 {
1023         if (rtt < 0.0) {
1024                 return;
1025         }
1026         RTTStatistics(rtt,"rudp",MAX_RELIABLE_WINDOW_SIZE*10);
1027
1028         float timeout = getStat(AVG_RTT) * RESEND_TIMEOUT_FACTOR;
1029         if (timeout < RESEND_TIMEOUT_MIN)
1030                 timeout = RESEND_TIMEOUT_MIN;
1031         if (timeout > RESEND_TIMEOUT_MAX)
1032                 timeout = RESEND_TIMEOUT_MAX;
1033
1034         JMutexAutoLock usage_lock(m_exclusive_access_mutex);
1035         resend_timeout = timeout;
1036 }
1037
1038 bool UDPPeer::Ping(float dtime,SharedBuffer<u8>& data)
1039 {
1040         m_ping_timer += dtime;
1041         if (m_ping_timer >= PING_TIMEOUT)
1042         {
1043                 // Create and send PING packet
1044                 writeU8(&data[0], TYPE_CONTROL);
1045                 writeU8(&data[1], CONTROLTYPE_PING);
1046                 m_ping_timer = 0.0;
1047                 return true;
1048         }
1049         return false;
1050 }
1051
1052 void UDPPeer::PutReliableSendCommand(ConnectionCommand &c,
1053                 unsigned int max_packet_size)
1054 {
1055         if (m_pending_disconnect)
1056                 return;
1057
1058         if ( channels[c.channelnum].queued_commands.empty() &&
1059                         /* don't queue more packets then window size */
1060                         (channels[c.channelnum].queued_reliables.size()
1061                         < (channels[c.channelnum].getWindowSize()/2))) {
1062                 LOG(dout_con<<m_connection->getDesc()
1063                                 <<" processing reliable command for peer id: " << c.peer_id
1064                                 <<" data size: " << c.data.getSize() << std::endl);
1065                 if (!processReliableSendCommand(c,max_packet_size)) {
1066                         channels[c.channelnum].queued_commands.push(c);
1067                 }
1068         }
1069         else {
1070                 LOG(dout_con<<m_connection->getDesc()
1071                                 <<" Queueing reliable command for peer id: " << c.peer_id
1072                                 <<" data size: " << c.data.getSize() <<std::endl);
1073                 channels[c.channelnum].queued_commands.push(c);
1074         }
1075 }
1076
1077 bool UDPPeer::processReliableSendCommand(
1078                                 ConnectionCommand &c,
1079                                 unsigned int max_packet_size)
1080 {
1081         if (m_pending_disconnect)
1082                 return true;
1083
1084         u32 chunksize_max = max_packet_size
1085                                                         - BASE_HEADER_SIZE
1086                                                         - RELIABLE_HEADER_SIZE;
1087
1088         assert(c.data.getSize() < MAX_RELIABLE_WINDOW_SIZE*512);
1089
1090         std::list<SharedBuffer<u8> > originals;
1091         u16 split_sequence_number = channels[c.channelnum].readNextSplitSeqNum();
1092
1093         if (c.raw)
1094         {
1095                 originals.push_back(c.data);
1096         }
1097         else {
1098                 originals = makeAutoSplitPacket(c.data, chunksize_max,split_sequence_number);
1099                 channels[c.channelnum].setNextSplitSeqNum(split_sequence_number);
1100         }
1101
1102         bool have_sequence_number = true;
1103         bool have_initial_sequence_number = false;
1104         std::queue<BufferedPacket> toadd;
1105         volatile u16 initial_sequence_number = 0;
1106
1107         for(std::list<SharedBuffer<u8> >::iterator i = originals.begin();
1108                 i != originals.end(); ++i)
1109         {
1110                 u16 seqnum = channels[c.channelnum].getOutgoingSequenceNumber(have_sequence_number);
1111
1112                 /* oops, we don't have enough sequence numbers to send this packet */
1113                 if (!have_sequence_number)
1114                         break;
1115
1116                 if (!have_initial_sequence_number)
1117                 {
1118                         initial_sequence_number = seqnum;
1119                         have_initial_sequence_number = true;
1120                 }
1121
1122                 SharedBuffer<u8> reliable = makeReliablePacket(*i, seqnum);
1123
1124                 // Add base headers and make a packet
1125                 BufferedPacket p = con::makePacket(address, reliable,
1126                                 m_connection->GetProtocolID(), m_connection->GetPeerID(),
1127                                 c.channelnum);
1128
1129                 toadd.push(p);
1130         }
1131
1132         if (have_sequence_number) {
1133                 volatile u16 pcount = 0;
1134                 while(toadd.size() > 0) {
1135                         BufferedPacket p = toadd.front();
1136                         toadd.pop();
1137 //                      LOG(dout_con<<connection->getDesc()
1138 //                                      << " queuing reliable packet for peer_id: " << c.peer_id
1139 //                                      << " channel: " << (c.channelnum&0xFF)
1140 //                                      << " seqnum: " << readU16(&p.data[BASE_HEADER_SIZE+1])
1141 //                                      << std::endl)
1142                         channels[c.channelnum].queued_reliables.push(p);
1143                         pcount++;
1144                 }
1145                 assert(channels[c.channelnum].queued_reliables.size() < 0xFFFF);
1146                 return true;
1147         }
1148         else {
1149                 volatile u16 packets_available = toadd.size();
1150                 /* we didn't get a single sequence number no need to fill queue */
1151                 if (!have_initial_sequence_number)
1152                 {
1153                         return false;
1154                 }
1155                 while(toadd.size() > 0) {
1156                         /* remove packet */
1157                         toadd.pop();
1158
1159                         bool successfully_put_back_sequence_number
1160                                 = channels[c.channelnum].putBackSequenceNumber(
1161                                         (initial_sequence_number+toadd.size() % (SEQNUM_MAX+1)));
1162
1163                         assert(successfully_put_back_sequence_number);
1164                 }
1165                 LOG(dout_con<<m_connection->getDesc()
1166                                 << " Windowsize exceeded on reliable sending "
1167                                 << c.data.getSize() << " bytes"
1168                                 << std::endl << "\t\tinitial_sequence_number: "
1169                                 << initial_sequence_number
1170                                 << std::endl << "\t\tgot at most            : "
1171                                 << packets_available << " packets"
1172                                 << std::endl << "\t\tpackets queued         : "
1173                                 << channels[c.channelnum].outgoing_reliables_sent.size()
1174                                 << std::endl);
1175                 return false;
1176         }
1177 }
1178
1179 void UDPPeer::RunCommandQueues(
1180                                                         unsigned int max_packet_size,
1181                                                         unsigned int maxcommands,
1182                                                         unsigned int maxtransfer)
1183 {
1184
1185         for (unsigned int i = 0; i < CHANNEL_COUNT; i++)
1186         {
1187                 unsigned int commands_processed = 0;
1188
1189                 if ((channels[i].queued_commands.size() > 0) &&
1190                                 (channels[i].queued_reliables.size() < maxtransfer) &&
1191                                 (commands_processed < maxcommands))
1192                 {
1193                         try {
1194                                 ConnectionCommand c = channels[i].queued_commands.front();
1195                                 channels[i].queued_commands.pop();
1196                                 LOG(dout_con<<m_connection->getDesc()
1197                                                 <<" processing queued reliable command "<<std::endl);
1198                                 if (!processReliableSendCommand(c,max_packet_size)) {
1199                                         LOG(dout_con<<m_connection->getDesc()
1200                                                         << " Failed to queue packets for peer_id: " << c.peer_id
1201                                                         << ", delaying sending of " << c.data.getSize()
1202                                                         << " bytes" << std::endl);
1203                                         channels[i].queued_commands.push(c);
1204                                 }
1205                         }
1206                         catch (ItemNotFoundException &e) {
1207                                 // intentionally empty
1208                         }
1209                 }
1210         }
1211 }
1212
1213 u16 UDPPeer::getNextSplitSequenceNumber(u8 channel)
1214 {
1215         assert(channel < CHANNEL_COUNT);
1216         return channels[channel].readNextIncomingSeqNum();
1217 }
1218
1219 void UDPPeer::setNextSplitSequenceNumber(u8 channel, u16 seqnum)
1220 {
1221         assert(channel < CHANNEL_COUNT);
1222         channels[channel].setNextSplitSeqNum(seqnum);
1223 }
1224
1225 SharedBuffer<u8> UDPPeer::addSpiltPacket(u8 channel,
1226                                                                                         BufferedPacket toadd,
1227                                                                                         bool reliable)
1228 {
1229         assert(channel < CHANNEL_COUNT);
1230         return channels[channel].incoming_splits.insert(toadd,reliable);
1231 }
1232
1233 /******************************************************************************/
1234 /* Connection Threads                                                         */
1235 /******************************************************************************/
1236
1237 ConnectionSendThread::ConnectionSendThread( unsigned int max_packet_size,
1238                                                                                         float timeout) :
1239         m_connection(NULL),
1240         m_max_packet_size(max_packet_size),
1241         m_timeout(timeout),
1242         m_max_commands_per_iteration(1),
1243         m_max_data_packets_per_iteration(g_settings->getU16("max_packets_per_iteration")),
1244         m_max_packets_requeued(256)
1245 {
1246 }
1247
1248 void * ConnectionSendThread::Thread()
1249 {
1250         assert(m_connection != NULL);
1251         ThreadStarted();
1252         log_register_thread("ConnectionSend");
1253
1254         LOG(dout_con<<m_connection->getDesc()
1255                         <<"ConnectionSend thread started"<<std::endl);
1256
1257         u32 curtime = porting::getTimeMs();
1258         u32 lasttime = curtime;
1259
1260         PROFILE(std::stringstream ThreadIdentifier);
1261         PROFILE(ThreadIdentifier << "ConnectionSend: [" << m_connection->getDesc() << "]");
1262
1263         porting::setThreadName("ConnectionSend");
1264
1265         /* if stop is requested don't stop immediately but try to send all        */
1266         /* packets first */
1267         while(!StopRequested() || packetsQueued()) {
1268                 BEGIN_DEBUG_EXCEPTION_HANDLER
1269                 PROFILE(ScopeProfiler sp(g_profiler, ThreadIdentifier.str(), SPT_AVG));
1270
1271                 m_iteration_packets_avaialble = m_max_data_packets_per_iteration;
1272
1273                 /* wait for trigger or timeout */
1274                 m_send_sleep_semaphore.Wait(50);
1275
1276                 /* remove all triggers */
1277                 while(m_send_sleep_semaphore.Wait(0)) {}
1278
1279                 lasttime = curtime;
1280                 curtime = porting::getTimeMs();
1281                 float dtime = CALC_DTIME(lasttime,curtime);
1282
1283                 /* first do all the reliable stuff */
1284                 runTimeouts(dtime);
1285
1286                 /* translate commands to packets */
1287                 ConnectionCommand c = m_connection->m_command_queue.pop_frontNoEx(0);
1288                 while(c.type != CONNCMD_NONE)
1289                                 {
1290                         if (c.reliable)
1291                                 processReliableCommand(c);
1292                         else
1293                                 processNonReliableCommand(c);
1294
1295                         c = m_connection->m_command_queue.pop_frontNoEx(0);
1296                 }
1297
1298                 /* send non reliable packets */
1299                 sendPackets(dtime);
1300
1301                 END_DEBUG_EXCEPTION_HANDLER(errorstream);
1302         }
1303
1304         PROFILE(g_profiler->remove(ThreadIdentifier.str()));
1305         return NULL;
1306 }
1307
1308 void ConnectionSendThread::Trigger()
1309 {
1310         m_send_sleep_semaphore.Post();
1311 }
1312
1313 bool ConnectionSendThread::packetsQueued()
1314 {
1315         std::list<u16> peerIds = m_connection->getPeerIDs();
1316
1317         if (!m_outgoing_queue.empty() && !peerIds.empty())
1318                 return true;
1319
1320         for(std::list<u16>::iterator j = peerIds.begin();
1321                         j != peerIds.end(); ++j)
1322         {
1323                 PeerHelper peer = m_connection->getPeerNoEx(*j);
1324
1325                 if (!peer)
1326                         continue;
1327
1328                 if (dynamic_cast<UDPPeer*>(&peer) == 0)
1329                         continue;
1330
1331                 for(u16 i=0; i<CHANNEL_COUNT; i++)
1332                 {
1333                         Channel *channel = &(dynamic_cast<UDPPeer*>(&peer))->channels[i];
1334
1335                         if (channel->queued_commands.size() > 0)
1336                         {
1337                                 return true;
1338                         }
1339                 }
1340         }
1341
1342
1343         return false;
1344 }
1345
1346 void ConnectionSendThread::runTimeouts(float dtime)
1347 {
1348         std::list<u16> timeouted_peers;
1349         std::list<u16> peerIds = m_connection->getPeerIDs();
1350
1351         for(std::list<u16>::iterator j = peerIds.begin();
1352                 j != peerIds.end(); ++j)
1353         {
1354                 PeerHelper peer = m_connection->getPeerNoEx(*j);
1355
1356                 if (!peer)
1357                         continue;
1358
1359                 if (dynamic_cast<UDPPeer*>(&peer) == 0)
1360                         continue;
1361
1362                 PROFILE(std::stringstream peerIdentifier);
1363                 PROFILE(peerIdentifier << "runTimeouts[" << m_connection->getDesc()
1364                                 << ";" << *j << ";RELIABLE]");
1365                 PROFILE(ScopeProfiler peerprofiler(g_profiler, peerIdentifier.str(), SPT_AVG));
1366
1367                 SharedBuffer<u8> data(2); // data for sending ping, required here because of goto
1368
1369                 /*
1370                         Check peer timeout
1371                 */
1372                 if (peer->isTimedOut(m_timeout))
1373                 {
1374                         infostream<<m_connection->getDesc()
1375                                         <<"RunTimeouts(): Peer "<<peer->id
1376                                         <<" has timed out."
1377                                         <<" (source=peer->timeout_counter)"
1378                                         <<std::endl;
1379                         // Add peer to the list
1380                         timeouted_peers.push_back(peer->id);
1381                         // Don't bother going through the buffers of this one
1382                         continue;
1383                 }
1384
1385                 float resend_timeout = dynamic_cast<UDPPeer*>(&peer)->getResendTimeout();
1386                 for(u16 i=0; i<CHANNEL_COUNT; i++)
1387                 {
1388                         std::list<BufferedPacket> timed_outs;
1389                         Channel *channel = &(dynamic_cast<UDPPeer*>(&peer))->channels[i];
1390
1391                         if (dynamic_cast<UDPPeer*>(&peer)->getLegacyPeer())
1392                                 channel->setWindowSize(g_settings->getU16("workaround_window_size"));
1393
1394                         // Remove timed out incomplete unreliable split packets
1395                         channel->incoming_splits.removeUnreliableTimedOuts(dtime, m_timeout);
1396
1397                         // Increment reliable packet times
1398                         channel->outgoing_reliables_sent.incrementTimeouts(dtime);
1399
1400                         unsigned int numpeers = m_connection->m_peers.size();
1401
1402                         if (numpeers == 0)
1403                                 return;
1404
1405                         // Re-send timed out outgoing reliables
1406                         timed_outs = channel->
1407                                         outgoing_reliables_sent.getTimedOuts(resend_timeout,
1408                                                         (m_max_data_packets_per_iteration/numpeers));
1409
1410                         channel->UpdatePacketLossCounter(timed_outs.size());
1411                         g_profiler->graphAdd("packets_lost", timed_outs.size());
1412
1413                         m_iteration_packets_avaialble -= timed_outs.size();
1414
1415                         for(std::list<BufferedPacket>::iterator k = timed_outs.begin();
1416                                 k != timed_outs.end(); ++k)
1417                         {
1418                                 u16 peer_id = readPeerId(*(k->data));
1419                                 u8 channelnum  = readChannel(*(k->data));
1420                                 u16 seqnum  = readU16(&(k->data[BASE_HEADER_SIZE+1]));
1421
1422                                 channel->UpdateBytesLost(k->data.getSize());
1423                                 k->resend_count++;
1424
1425                                 LOG(derr_con<<m_connection->getDesc()
1426                                                 <<"RE-SENDING timed-out RELIABLE to "
1427                                                 << k->address.serializeString()
1428                                                 << "(t/o="<<resend_timeout<<"): "
1429                                                 <<"from_peer_id="<<peer_id
1430                                                 <<", channel="<<((int)channelnum&0xff)
1431                                                 <<", seqnum="<<seqnum
1432                                                 <<std::endl);
1433
1434                                 rawSend(*k);
1435
1436                                 // do not handle rtt here as we can't decide if this packet was
1437                                 // lost or really takes more time to transmit
1438                         }
1439                         channel->UpdateTimers(dtime,dynamic_cast<UDPPeer*>(&peer)->getLegacyPeer());
1440                 }
1441
1442                 /* send ping if necessary */
1443                 if (dynamic_cast<UDPPeer*>(&peer)->Ping(dtime,data)) {
1444                         LOG(dout_con<<m_connection->getDesc()
1445                                         <<"Sending ping for peer_id: "
1446                                         << dynamic_cast<UDPPeer*>(&peer)->id <<std::endl);
1447                         /* this may fail if there ain't a sequence number left */
1448                         if (!rawSendAsPacket(dynamic_cast<UDPPeer*>(&peer)->id, 0, data, true))
1449                         {
1450                                 //retrigger with reduced ping interval
1451                                 dynamic_cast<UDPPeer*>(&peer)->Ping(4.0,data);
1452                         }
1453                 }
1454
1455                 dynamic_cast<UDPPeer*>(&peer)->RunCommandQueues(m_max_packet_size,
1456                                                                 m_max_commands_per_iteration,
1457                                                                 m_max_packets_requeued);
1458         }
1459
1460         // Remove timed out peers
1461         for(std::list<u16>::iterator i = timeouted_peers.begin();
1462                 i != timeouted_peers.end(); ++i)
1463         {
1464                 LOG(derr_con<<m_connection->getDesc()
1465                                 <<"RunTimeouts(): Removing peer "<<(*i)<<std::endl);
1466                 m_connection->deletePeer(*i, true);
1467         }
1468 }
1469
1470 void ConnectionSendThread::rawSend(const BufferedPacket &packet)
1471 {
1472         try{
1473                 m_connection->m_udpSocket.Send(packet.address, *packet.data,
1474                                 packet.data.getSize());
1475                 LOG(dout_con <<m_connection->getDesc()
1476                                 << " rawSend: " << packet.data.getSize()
1477                                 << " bytes sent" << std::endl);
1478         } catch(SendFailedException &e) {
1479                 LOG(derr_con<<m_connection->getDesc()
1480                                 <<"Connection::rawSend(): SendFailedException: "
1481                                 <<packet.address.serializeString()<<std::endl);
1482         }
1483 }
1484
1485 void ConnectionSendThread::sendAsPacketReliable(BufferedPacket& p, Channel* channel)
1486 {
1487         try{
1488                 p.absolute_send_time = porting::getTimeMs();
1489                 // Buffer the packet
1490                 channel->outgoing_reliables_sent.insert(p,
1491                         (channel->readOutgoingSequenceNumber() - MAX_RELIABLE_WINDOW_SIZE)
1492                         % (MAX_RELIABLE_WINDOW_SIZE+1));
1493         }
1494         catch(AlreadyExistsException &e)
1495         {
1496                 LOG(derr_con<<m_connection->getDesc()
1497                                 <<"WARNING: Going to send a reliable packet"
1498                                 <<" in outgoing buffer" <<std::endl);
1499                 //assert(0);
1500         }
1501
1502         // Send the packet
1503         rawSend(p);
1504 }
1505
1506 bool ConnectionSendThread::rawSendAsPacket(u16 peer_id, u8 channelnum,
1507                 SharedBuffer<u8> data, bool reliable)
1508 {
1509         PeerHelper peer = m_connection->getPeerNoEx(peer_id);
1510         if (!peer) {
1511                 LOG(dout_con<<m_connection->getDesc()
1512                                 <<" INFO: dropped packet for non existent peer_id: "
1513                                 << peer_id << std::endl);
1514                 assert(reliable && "trying to send raw packet reliable but no peer found!");
1515                 return false;
1516         }
1517         Channel *channel = &(dynamic_cast<UDPPeer*>(&peer)->channels[channelnum]);
1518
1519         if (reliable)
1520         {
1521                 bool have_sequence_number_for_raw_packet = true;
1522                 u16 seqnum =
1523                                 channel->getOutgoingSequenceNumber(have_sequence_number_for_raw_packet);
1524
1525                 if (!have_sequence_number_for_raw_packet)
1526                         return false;
1527
1528                 SharedBuffer<u8> reliable = makeReliablePacket(data, seqnum);
1529                 Address peer_address;
1530                 peer->getAddress(MTP_MINETEST_RELIABLE_UDP, peer_address);
1531
1532                 // Add base headers and make a packet
1533                 BufferedPacket p = con::makePacket(peer_address, reliable,
1534                                 m_connection->GetProtocolID(), m_connection->GetPeerID(),
1535                                 channelnum);
1536
1537                 // first check if our send window is already maxed out
1538                 if (channel->outgoing_reliables_sent.size()
1539                                 < channel->getWindowSize()) {
1540                         LOG(dout_con<<m_connection->getDesc()
1541                                         <<" INFO: sending a reliable packet to peer_id " << peer_id
1542                                         <<" channel: " << channelnum
1543                                         <<" seqnum: " << seqnum << std::endl);
1544                         sendAsPacketReliable(p,channel);
1545                         return true;
1546                 }
1547                 else {
1548                         LOG(dout_con<<m_connection->getDesc()
1549                                         <<" INFO: queueing reliable packet for peer_id: " << peer_id
1550                                         <<" channel: " << channelnum
1551                                         <<" seqnum: " << seqnum << std::endl);
1552                         channel->queued_reliables.push(p);
1553                         return false;
1554                 }
1555         }
1556         else
1557         {
1558                 Address peer_address;
1559
1560                 if (peer->getAddress(MTP_UDP, peer_address))
1561                 {
1562                         // Add base headers and make a packet
1563                         BufferedPacket p = con::makePacket(peer_address, data,
1564                                         m_connection->GetProtocolID(), m_connection->GetPeerID(),
1565                                         channelnum);
1566
1567                         // Send the packet
1568                         rawSend(p);
1569                         return true;
1570                 }
1571                 else {
1572                         LOG(dout_con<<m_connection->getDesc()
1573                                         <<" INFO: dropped unreliable packet for peer_id: " << peer_id
1574                                         <<" because of (yet) missing udp address" << std::endl);
1575                         return false;
1576                 }
1577         }
1578
1579         //never reached
1580         return false;
1581 }
1582
1583 void ConnectionSendThread::processReliableCommand(ConnectionCommand &c)
1584 {
1585         assert(c.reliable);
1586
1587         switch(c.type) {
1588         case CONNCMD_NONE:
1589                 LOG(dout_con<<m_connection->getDesc()
1590                                 <<"UDP processing reliable CONNCMD_NONE"<<std::endl);
1591                 return;
1592
1593         case CONNCMD_SEND:
1594                 LOG(dout_con<<m_connection->getDesc()
1595                                 <<"UDP processing reliable CONNCMD_SEND"<<std::endl);
1596                 sendReliable(c);
1597                 return;
1598
1599         case CONNCMD_SEND_TO_ALL:
1600                 LOG(dout_con<<m_connection->getDesc()
1601                                 <<"UDP processing CONNCMD_SEND_TO_ALL"<<std::endl);
1602                 sendToAllReliable(c);
1603                 return;
1604
1605         case CONCMD_CREATE_PEER:
1606                 LOG(dout_con<<m_connection->getDesc()
1607                                 <<"UDP processing reliable CONCMD_CREATE_PEER"<<std::endl);
1608                 if (!rawSendAsPacket(c.peer_id,c.channelnum,c.data,c.reliable))
1609                 {
1610                         /* put to queue if we couldn't send it immediately */
1611                         sendReliable(c);
1612                 }
1613                 return;
1614
1615         case CONCMD_DISABLE_LEGACY:
1616                 LOG(dout_con<<m_connection->getDesc()
1617                                 <<"UDP processing reliable CONCMD_DISABLE_LEGACY"<<std::endl);
1618                 if (!rawSendAsPacket(c.peer_id,c.channelnum,c.data,c.reliable))
1619                 {
1620                         /* put to queue if we couldn't send it immediately */
1621                         sendReliable(c);
1622                 }
1623                 return;
1624
1625         case CONNCMD_SERVE:
1626         case CONNCMD_CONNECT:
1627         case CONNCMD_DISCONNECT:
1628         case CONCMD_ACK:
1629                 assert("Got command that shouldn't be reliable as reliable command" == 0);
1630         default:
1631                 LOG(dout_con<<m_connection->getDesc()
1632                                 <<" Invalid reliable command type: " << c.type <<std::endl);
1633         }
1634 }
1635
1636
1637 void ConnectionSendThread::processNonReliableCommand(ConnectionCommand &c)
1638 {
1639         assert(!c.reliable);
1640
1641         switch(c.type) {
1642         case CONNCMD_NONE:
1643                 LOG(dout_con<<m_connection->getDesc()
1644                                 <<" UDP processing CONNCMD_NONE"<<std::endl);
1645                 return;
1646         case CONNCMD_SERVE:
1647                 LOG(dout_con<<m_connection->getDesc()
1648                                 <<" UDP processing CONNCMD_SERVE port="
1649                                 <<c.address.serializeString()<<std::endl);
1650                 serve(c.address);
1651                 return;
1652         case CONNCMD_CONNECT:
1653                 LOG(dout_con<<m_connection->getDesc()
1654                                 <<" UDP processing CONNCMD_CONNECT"<<std::endl);
1655                 connect(c.address);
1656                 return;
1657         case CONNCMD_DISCONNECT:
1658                 LOG(dout_con<<m_connection->getDesc()
1659                                 <<" UDP processing CONNCMD_DISCONNECT"<<std::endl);
1660                 disconnect();
1661                 return;
1662         case CONNCMD_DISCONNECT_PEER:
1663                 LOG(dout_con<<m_connection->getDesc()
1664                                 <<" UDP processing CONNCMD_DISCONNECT_PEER"<<std::endl);
1665                 disconnect_peer(c.peer_id);
1666                 return;
1667         case CONNCMD_SEND:
1668                 LOG(dout_con<<m_connection->getDesc()
1669                                 <<" UDP processing CONNCMD_SEND"<<std::endl);
1670                 send(c.peer_id, c.channelnum, c.data);
1671                 return;
1672         case CONNCMD_SEND_TO_ALL:
1673                 LOG(dout_con<<m_connection->getDesc()
1674                                 <<" UDP processing CONNCMD_SEND_TO_ALL"<<std::endl);
1675                 sendToAll(c.channelnum, c.data);
1676                 return;
1677         case CONCMD_ACK:
1678                 LOG(dout_con<<m_connection->getDesc()
1679                                 <<" UDP processing CONCMD_ACK"<<std::endl);
1680                 sendAsPacket(c.peer_id,c.channelnum,c.data,true);
1681                 return;
1682         case CONCMD_CREATE_PEER:
1683                 assert("Got command that should be reliable as unreliable command" == 0);
1684         default:
1685                 LOG(dout_con<<m_connection->getDesc()
1686                                 <<" Invalid command type: " << c.type <<std::endl);
1687         }
1688 }
1689
1690 void ConnectionSendThread::serve(Address bind_address)
1691 {
1692         LOG(dout_con<<m_connection->getDesc()
1693                         <<"UDP serving at port " << bind_address.serializeString() <<std::endl);
1694         try{
1695                 m_connection->m_udpSocket.Bind(bind_address);
1696                 m_connection->SetPeerID(PEER_ID_SERVER);
1697         }
1698         catch(SocketException &e) {
1699                 // Create event
1700                 ConnectionEvent ce;
1701                 ce.bindFailed();
1702                 m_connection->putEvent(ce);
1703         }
1704 }
1705
1706 void ConnectionSendThread::connect(Address address)
1707 {
1708         LOG(dout_con<<m_connection->getDesc()<<" connecting to "<<address.serializeString()
1709                         <<":"<<address.getPort()<<std::endl);
1710
1711         UDPPeer *peer = m_connection->createServerPeer(address);
1712
1713         // Create event
1714         ConnectionEvent e;
1715         e.peerAdded(peer->id, peer->address);
1716         m_connection->putEvent(e);
1717
1718         Address bind_addr;
1719
1720         if (address.isIPv6())
1721                 bind_addr.setAddress((IPv6AddressBytes*) NULL);
1722         else
1723                 bind_addr.setAddress(0,0,0,0);
1724
1725         m_connection->m_udpSocket.Bind(bind_addr);
1726
1727         // Send a dummy packet to server with peer_id = PEER_ID_INEXISTENT
1728         m_connection->SetPeerID(PEER_ID_INEXISTENT);
1729         NetworkPacket* pkt = new NetworkPacket(0,0);
1730         m_connection->Send(PEER_ID_SERVER, 0, pkt, true);
1731         delete pkt;
1732 }
1733
1734 void ConnectionSendThread::disconnect()
1735 {
1736         LOG(dout_con<<m_connection->getDesc()<<" disconnecting"<<std::endl);
1737
1738         // Create and send DISCO packet
1739         SharedBuffer<u8> data(2);
1740         writeU8(&data[0], TYPE_CONTROL);
1741         writeU8(&data[1], CONTROLTYPE_DISCO);
1742
1743
1744         // Send to all
1745         std::list<u16> peerids = m_connection->getPeerIDs();
1746
1747         for (std::list<u16>::iterator i = peerids.begin();
1748                         i != peerids.end();
1749                         i++)
1750         {
1751                 sendAsPacket(*i, 0,data,false);
1752         }
1753 }
1754
1755 void ConnectionSendThread::disconnect_peer(u16 peer_id)
1756 {
1757         LOG(dout_con<<m_connection->getDesc()<<" disconnecting peer"<<std::endl);
1758
1759         // Create and send DISCO packet
1760         SharedBuffer<u8> data(2);
1761         writeU8(&data[0], TYPE_CONTROL);
1762         writeU8(&data[1], CONTROLTYPE_DISCO);
1763         sendAsPacket(peer_id, 0,data,false);
1764
1765         PeerHelper peer = m_connection->getPeerNoEx(peer_id);
1766
1767         if (!peer)
1768                 return;
1769
1770         if (dynamic_cast<UDPPeer*>(&peer) == 0)
1771         {
1772                 return;
1773         }
1774
1775         dynamic_cast<UDPPeer*>(&peer)->m_pending_disconnect = true;
1776 }
1777
1778 void ConnectionSendThread::send(u16 peer_id, u8 channelnum,
1779                 SharedBuffer<u8> data)
1780 {
1781         assert(channelnum < CHANNEL_COUNT);
1782
1783         PeerHelper peer = m_connection->getPeerNoEx(peer_id);
1784         if (!peer)
1785         {
1786                 LOG(dout_con<<m_connection->getDesc()<<" peer: peer_id="<<peer_id
1787                                 << ">>>NOT<<< found on sending packet"
1788                                 << ", channel " << (channelnum % 0xFF)
1789                                 << ", size: " << data.getSize() <<std::endl);
1790                 return;
1791         }
1792
1793         LOG(dout_con<<m_connection->getDesc()<<" sending to peer_id="<<peer_id
1794                         << ", channel " << (channelnum % 0xFF)
1795                         << ", size: " << data.getSize() <<std::endl);
1796
1797         u16 split_sequence_number = peer->getNextSplitSequenceNumber(channelnum);
1798
1799         u32 chunksize_max = m_max_packet_size - BASE_HEADER_SIZE;
1800         std::list<SharedBuffer<u8> > originals;
1801
1802         originals = makeAutoSplitPacket(data, chunksize_max,split_sequence_number);
1803
1804         peer->setNextSplitSequenceNumber(channelnum,split_sequence_number);
1805
1806         for(std::list<SharedBuffer<u8> >::iterator i = originals.begin();
1807                 i != originals.end(); ++i)
1808         {
1809                 SharedBuffer<u8> original = *i;
1810                 sendAsPacket(peer_id, channelnum, original);
1811         }
1812 }
1813
1814 void ConnectionSendThread::sendReliable(ConnectionCommand &c)
1815 {
1816         PeerHelper peer = m_connection->getPeerNoEx(c.peer_id);
1817         if (!peer)
1818                 return;
1819
1820         peer->PutReliableSendCommand(c,m_max_packet_size);
1821 }
1822
1823 void ConnectionSendThread::sendToAll(u8 channelnum, SharedBuffer<u8> data)
1824 {
1825         std::list<u16> peerids = m_connection->getPeerIDs();
1826
1827         for (std::list<u16>::iterator i = peerids.begin();
1828                         i != peerids.end();
1829                         i++)
1830         {
1831                 send(*i, channelnum, data);
1832         }
1833 }
1834
1835 void ConnectionSendThread::sendToAllReliable(ConnectionCommand &c)
1836 {
1837         std::list<u16> peerids = m_connection->getPeerIDs();
1838
1839         for (std::list<u16>::iterator i = peerids.begin();
1840                         i != peerids.end();
1841                         i++)
1842         {
1843                 PeerHelper peer = m_connection->getPeerNoEx(*i);
1844
1845                 if (!peer)
1846                         continue;
1847
1848                 peer->PutReliableSendCommand(c,m_max_packet_size);
1849         }
1850 }
1851
1852 void ConnectionSendThread::sendPackets(float dtime)
1853 {
1854         std::list<u16> peerIds = m_connection->getPeerIDs();
1855         std::list<u16> pendingDisconnect;
1856         std::map<u16,bool> pending_unreliable;
1857
1858         for(std::list<u16>::iterator
1859                         j = peerIds.begin();
1860                         j != peerIds.end(); ++j)
1861         {
1862                 PeerHelper peer = m_connection->getPeerNoEx(*j);
1863                 //peer may have been removed
1864                 if (!peer) {
1865                         LOG(dout_con<<m_connection->getDesc()<< " Peer not found: peer_id=" << *j << std::endl);
1866                         continue;
1867                 }
1868                 peer->m_increment_packets_remaining = m_iteration_packets_avaialble/m_connection->m_peers.size();
1869
1870                 if (dynamic_cast<UDPPeer*>(&peer) == 0)
1871                 {
1872                         continue;
1873                 }
1874
1875                 if (dynamic_cast<UDPPeer*>(&peer)->m_pending_disconnect)
1876                 {
1877                         pendingDisconnect.push_back(*j);
1878                 }
1879
1880                 PROFILE(std::stringstream peerIdentifier);
1881                 PROFILE(peerIdentifier << "sendPackets[" << m_connection->getDesc() << ";" << *j << ";RELIABLE]");
1882                 PROFILE(ScopeProfiler peerprofiler(g_profiler, peerIdentifier.str(), SPT_AVG));
1883
1884                 LOG(dout_con<<m_connection->getDesc()
1885                                 << " Handle per peer queues: peer_id=" << *j
1886                                 << " packet quota: " << peer->m_increment_packets_remaining << std::endl);
1887                 // first send queued reliable packets for all peers (if possible)
1888                 for (unsigned int i=0; i < CHANNEL_COUNT; i++)
1889                 {
1890                         u16 next_to_ack = 0;
1891                         dynamic_cast<UDPPeer*>(&peer)->channels[i].outgoing_reliables_sent.getFirstSeqnum(next_to_ack);
1892                         u16 next_to_receive = 0;
1893                         dynamic_cast<UDPPeer*>(&peer)->channels[i].incoming_reliables.getFirstSeqnum(next_to_receive);
1894
1895                         LOG(dout_con<<m_connection->getDesc()<< "\t channel: "
1896                                                 << i << ", peer quota:"
1897                                                 << peer->m_increment_packets_remaining
1898                                                 << std::endl
1899                                         << "\t\t\treliables on wire: "
1900                                                 << dynamic_cast<UDPPeer*>(&peer)->channels[i].outgoing_reliables_sent.size()
1901                                                 << ", waiting for ack for " << next_to_ack
1902                                                 << std::endl
1903                                         << "\t\t\tincoming_reliables: "
1904                                                 << dynamic_cast<UDPPeer*>(&peer)->channels[i].incoming_reliables.size()
1905                                                 << ", next reliable packet: "
1906                                                 << dynamic_cast<UDPPeer*>(&peer)->channels[i].readNextIncomingSeqNum()
1907                                                 << ", next queued: " << next_to_receive
1908                                                 << std::endl
1909                                         << "\t\t\treliables queued : "
1910                                                 << dynamic_cast<UDPPeer*>(&peer)->channels[i].queued_reliables.size()
1911                                                 << std::endl
1912                                         << "\t\t\tqueued commands  : "
1913                                                 << dynamic_cast<UDPPeer*>(&peer)->channels[i].queued_commands.size()
1914                                                 << std::endl);
1915
1916                         while ((dynamic_cast<UDPPeer*>(&peer)->channels[i].queued_reliables.size() > 0) &&
1917                                         (dynamic_cast<UDPPeer*>(&peer)->channels[i].outgoing_reliables_sent.size()
1918                                                         < dynamic_cast<UDPPeer*>(&peer)->channels[i].getWindowSize())&&
1919                                                         (peer->m_increment_packets_remaining > 0))
1920                         {
1921                                 BufferedPacket p = dynamic_cast<UDPPeer*>(&peer)->channels[i].queued_reliables.front();
1922                                 dynamic_cast<UDPPeer*>(&peer)->channels[i].queued_reliables.pop();
1923                                 Channel* channel = &(dynamic_cast<UDPPeer*>(&peer)->channels[i]);
1924                                 LOG(dout_con<<m_connection->getDesc()
1925                                                 <<" INFO: sending a queued reliable packet "
1926                                                 <<" channel: " << i
1927                                                 <<", seqnum: " << readU16(&p.data[BASE_HEADER_SIZE+1])
1928                                                 << std::endl);
1929                                 sendAsPacketReliable(p,channel);
1930                                 peer->m_increment_packets_remaining--;
1931                         }
1932                 }
1933         }
1934
1935         if (m_outgoing_queue.size())
1936         {
1937                 LOG(dout_con<<m_connection->getDesc()
1938                                 << " Handle non reliable queue ("
1939                                 << m_outgoing_queue.size() << " pkts)" << std::endl);
1940         }
1941
1942         unsigned int initial_queuesize = m_outgoing_queue.size();
1943         /* send non reliable packets*/
1944         for(unsigned int i=0;i < initial_queuesize;i++) {
1945                 OutgoingPacket packet = m_outgoing_queue.front();
1946                 m_outgoing_queue.pop();
1947
1948                 if (packet.reliable)
1949                         continue;
1950
1951                 PeerHelper peer = m_connection->getPeerNoEx(packet.peer_id);
1952                 if (!peer) {
1953                         LOG(dout_con<<m_connection->getDesc()
1954                                                         <<" Outgoing queue: peer_id="<<packet.peer_id
1955                                                         << ">>>NOT<<< found on sending packet"
1956                                                         << ", channel " << (packet.channelnum % 0xFF)
1957                                                         << ", size: " << packet.data.getSize() <<std::endl);
1958                         continue;
1959                 }
1960                 /* send acks immediately */
1961                 else if (packet.ack)
1962                 {
1963                         rawSendAsPacket(packet.peer_id, packet.channelnum,
1964                                                                 packet.data, packet.reliable);
1965                         peer->m_increment_packets_remaining =
1966                                         MYMIN(0,peer->m_increment_packets_remaining--);
1967                 }
1968                 else if (
1969                         ( peer->m_increment_packets_remaining > 0) ||
1970                         (StopRequested())) {
1971                         rawSendAsPacket(packet.peer_id, packet.channelnum,
1972                                         packet.data, packet.reliable);
1973                         peer->m_increment_packets_remaining--;
1974                 }
1975                 else {
1976                         m_outgoing_queue.push(packet);
1977                         pending_unreliable[packet.peer_id] = true;
1978                 }
1979         }
1980
1981         for(std::list<u16>::iterator
1982                                 k = pendingDisconnect.begin();
1983                                 k != pendingDisconnect.end(); ++k)
1984         {
1985                 if (!pending_unreliable[*k])
1986                 {
1987                         m_connection->deletePeer(*k,false);
1988                 }
1989         }
1990 }
1991
1992 void ConnectionSendThread::sendAsPacket(u16 peer_id, u8 channelnum,
1993                 SharedBuffer<u8> data, bool ack)
1994 {
1995         OutgoingPacket packet(peer_id, channelnum, data, false, ack);
1996         m_outgoing_queue.push(packet);
1997 }
1998
1999 ConnectionReceiveThread::ConnectionReceiveThread(unsigned int max_packet_size) :
2000         m_connection(NULL)
2001 {
2002 }
2003
2004 void * ConnectionReceiveThread::Thread()
2005 {
2006         assert(m_connection != NULL);
2007         ThreadStarted();
2008         log_register_thread("ConnectionReceive");
2009
2010         LOG(dout_con<<m_connection->getDesc()
2011                         <<"ConnectionReceive thread started"<<std::endl);
2012
2013         PROFILE(std::stringstream ThreadIdentifier);
2014         PROFILE(ThreadIdentifier << "ConnectionReceive: [" << m_connection->getDesc() << "]");
2015
2016         porting::setThreadName("ConnectionReceive");
2017
2018 #ifdef DEBUG_CONNECTION_KBPS
2019         u32 curtime = porting::getTimeMs();
2020         u32 lasttime = curtime;
2021         float debug_print_timer = 0.0;
2022 #endif
2023
2024         while(!StopRequested()) {
2025                 BEGIN_DEBUG_EXCEPTION_HANDLER
2026                 PROFILE(ScopeProfiler sp(g_profiler, ThreadIdentifier.str(), SPT_AVG));
2027
2028 #ifdef DEBUG_CONNECTION_KBPS
2029                 lasttime = curtime;
2030                 curtime = porting::getTimeMs();
2031                 float dtime = CALC_DTIME(lasttime,curtime);
2032 #endif
2033
2034                 /* receive packets */
2035                 receive();
2036
2037 #ifdef DEBUG_CONNECTION_KBPS
2038                 debug_print_timer += dtime;
2039                 if (debug_print_timer > 20.0) {
2040                         debug_print_timer -= 20.0;
2041
2042                         std::list<u16> peerids = m_connection->getPeerIDs();
2043
2044                         for (std::list<u16>::iterator i = peerids.begin();
2045                                         i != peerids.end();
2046                                         i++)
2047                         {
2048                                 PeerHelper peer = m_connection->getPeerNoEx(*i);
2049                                 if (!peer)
2050                                         continue;
2051
2052                                 float peer_current = 0.0;
2053                                 float peer_loss = 0.0;
2054                                 float avg_rate = 0.0;
2055                                 float avg_loss = 0.0;
2056
2057                                 for(u16 j=0; j<CHANNEL_COUNT; j++)
2058                                 {
2059                                         peer_current +=peer->channels[j].getCurrentDownloadRateKB();
2060                                         peer_loss += peer->channels[j].getCurrentLossRateKB();
2061                                         avg_rate += peer->channels[j].getAvgDownloadRateKB();
2062                                         avg_loss += peer->channels[j].getAvgLossRateKB();
2063                                 }
2064
2065                                 std::stringstream output;
2066                                 output << std::fixed << std::setprecision(1);
2067                                 output << "OUT to Peer " << *i << " RATES (good / loss) " << std::endl;
2068                                 output << "\tcurrent (sum): " << peer_current << "kb/s "<< peer_loss << "kb/s" << std::endl;
2069                                 output << "\taverage (sum): " << avg_rate << "kb/s "<< avg_loss << "kb/s" << std::endl;
2070                                 output << std::setfill(' ');
2071                                 for(u16 j=0; j<CHANNEL_COUNT; j++)
2072                                 {
2073                                         output << "\tcha " << j << ":"
2074                                                 << " CUR: " << std::setw(6) << peer->channels[j].getCurrentDownloadRateKB() <<"kb/s"
2075                                                 << " AVG: " << std::setw(6) << peer->channels[j].getAvgDownloadRateKB() <<"kb/s"
2076                                                 << " MAX: " << std::setw(6) << peer->channels[j].getMaxDownloadRateKB() <<"kb/s"
2077                                                 << " /"
2078                                                 << " CUR: " << std::setw(6) << peer->channels[j].getCurrentLossRateKB() <<"kb/s"
2079                                                 << " AVG: " << std::setw(6) << peer->channels[j].getAvgLossRateKB() <<"kb/s"
2080                                                 << " MAX: " << std::setw(6) << peer->channels[j].getMaxLossRateKB() <<"kb/s"
2081                                                 << " / WS: " << peer->channels[j].getWindowSize()
2082                                                 << std::endl;
2083                                 }
2084
2085                                 fprintf(stderr,"%s\n",output.str().c_str());
2086                         }
2087                 }
2088 #endif
2089                 END_DEBUG_EXCEPTION_HANDLER(errorstream);
2090         }
2091         PROFILE(g_profiler->remove(ThreadIdentifier.str()));
2092         return NULL;
2093 }
2094
2095 // Receive packets from the network and buffers and create ConnectionEvents
2096 void ConnectionReceiveThread::receive()
2097 {
2098         // use IPv6 minimum allowed MTU as receive buffer size as this is
2099         // theoretical reliable upper boundary of a udp packet for all IPv6 enabled
2100         // infrastructure
2101         unsigned int packet_maxsize = 1500;
2102         SharedBuffer<u8> packetdata(packet_maxsize);
2103
2104         bool packet_queued = true;
2105
2106         unsigned int loop_count = 0;
2107
2108         /* first of all read packets from socket */
2109         /* check for incoming data available */
2110         while( (loop_count < 10) &&
2111                         (m_connection->m_udpSocket.WaitData(50))) {
2112                 loop_count++;
2113                 try {
2114                         if (packet_queued) {
2115                                 bool data_left = true;
2116                                 u16 peer_id;
2117                                 SharedBuffer<u8> resultdata;
2118                                 while(data_left) {
2119                                         try {
2120                                                 data_left = getFromBuffers(peer_id, resultdata);
2121                                                 if (data_left) {
2122                                                         ConnectionEvent e;
2123                                                         e.dataReceived(peer_id, resultdata);
2124                                                         m_connection->putEvent(e);
2125                                                 }
2126                                         }
2127                                         catch(ProcessedSilentlyException &e) {
2128                                                 /* try reading again */
2129                                         }
2130                                 }
2131                                 packet_queued = false;
2132                         }
2133
2134                         Address sender;
2135                         s32 received_size = m_connection->m_udpSocket.Receive(sender, *packetdata, packet_maxsize);
2136
2137                         if ((received_size < BASE_HEADER_SIZE) ||
2138                                 (readU32(&packetdata[0]) != m_connection->GetProtocolID()))
2139                         {
2140                                 LOG(derr_con<<m_connection->getDesc()
2141                                                 <<"Receive(): Invalid incoming packet, "
2142                                                 <<"size: " << received_size
2143                                                 <<", protocol: "
2144                                                 << ((received_size >= 4) ? readU32(&packetdata[0]) : -1)
2145                                                 << std::endl);
2146                                 continue;
2147                         }
2148
2149                         u16 peer_id          = readPeerId(*packetdata);
2150                         u8 channelnum        = readChannel(*packetdata);
2151
2152                         if (channelnum > CHANNEL_COUNT-1) {
2153                                 LOG(derr_con<<m_connection->getDesc()
2154                                                 <<"Receive(): Invalid channel "<<channelnum<<std::endl);
2155                                 throw InvalidIncomingDataException("Channel doesn't exist");
2156                         }
2157
2158                         /* preserve original peer_id for later usage */
2159                         u16 packet_peer_id   = peer_id;
2160
2161                         /* Try to identify peer by sender address (may happen on join) */
2162                         if (peer_id == PEER_ID_INEXISTENT) {
2163                                 peer_id = m_connection->lookupPeer(sender);
2164                         }
2165
2166                         /* The peer was not found in our lists. Add it. */
2167                         if (peer_id == PEER_ID_INEXISTENT) {
2168                                 peer_id = m_connection->createPeer(sender, MTP_MINETEST_RELIABLE_UDP, 0);
2169                         }
2170
2171                         PeerHelper peer = m_connection->getPeerNoEx(peer_id);
2172
2173                         if (!peer) {
2174                                 LOG(dout_con<<m_connection->getDesc()
2175                                                 <<" got packet from unknown peer_id: "
2176                                                 <<peer_id<<" Ignoring."<<std::endl);
2177                                 continue;
2178                         }
2179
2180                         // Validate peer address
2181
2182                         Address peer_address;
2183
2184                         if (peer->getAddress(MTP_UDP, peer_address)) {
2185                                 if (peer_address != sender) {
2186                                         LOG(derr_con<<m_connection->getDesc()
2187                                                         <<m_connection->getDesc()
2188                                                         <<" Peer "<<peer_id<<" sending from different address."
2189                                                         " Ignoring."<<std::endl);
2190                                         continue;
2191                                 }
2192                         }
2193                         else {
2194
2195                                 bool invalid_address = true;
2196                                 if (invalid_address) {
2197                                         LOG(derr_con<<m_connection->getDesc()
2198                                                         <<m_connection->getDesc()
2199                                                         <<" Peer "<<peer_id<<" unknown."
2200                                                         " Ignoring."<<std::endl);
2201                                         continue;
2202                                 }
2203                         }
2204
2205
2206                         /* mark peer as seen with id */
2207                         if (!(packet_peer_id == PEER_ID_INEXISTENT))
2208                                 peer->setSentWithID();
2209
2210                         peer->ResetTimeout();
2211
2212                         Channel *channel = 0;
2213
2214                         if (dynamic_cast<UDPPeer*>(&peer) != 0)
2215                         {
2216                                 channel = &(dynamic_cast<UDPPeer*>(&peer)->channels[channelnum]);
2217                         }
2218
2219                         if (channel != 0) {
2220                                 channel->UpdateBytesReceived(received_size);
2221                         }
2222
2223                         // Throw the received packet to channel->processPacket()
2224
2225                         // Make a new SharedBuffer from the data without the base headers
2226                         SharedBuffer<u8> strippeddata(received_size - BASE_HEADER_SIZE);
2227                         memcpy(*strippeddata, &packetdata[BASE_HEADER_SIZE],
2228                                         strippeddata.getSize());
2229
2230                         try{
2231                                 // Process it (the result is some data with no headers made by us)
2232                                 SharedBuffer<u8> resultdata = processPacket
2233                                                 (channel, strippeddata, peer_id, channelnum, false);
2234
2235                                 LOG(dout_con<<m_connection->getDesc()
2236                                                 <<" ProcessPacket from peer_id: " << peer_id
2237                                                 << ",channel: " << (channelnum & 0xFF) << ", returned "
2238                                                 << resultdata.getSize() << " bytes" <<std::endl);
2239
2240                                 ConnectionEvent e;
2241                                 e.dataReceived(peer_id, resultdata);
2242                                 m_connection->putEvent(e);
2243                         }
2244                         catch(ProcessedSilentlyException &e) {
2245                         }
2246                         catch(ProcessedQueued &e) {
2247                                 packet_queued = true;
2248                         }
2249                 }
2250                 catch(InvalidIncomingDataException &e) {
2251                 }
2252                 catch(ProcessedSilentlyException &e) {
2253                 }
2254         }
2255 }
2256
2257 bool ConnectionReceiveThread::getFromBuffers(u16 &peer_id, SharedBuffer<u8> &dst)
2258 {
2259         std::list<u16> peerids = m_connection->getPeerIDs();
2260
2261         for(std::list<u16>::iterator j = peerids.begin();
2262                 j != peerids.end(); ++j)
2263         {
2264                 PeerHelper peer = m_connection->getPeerNoEx(*j);
2265                 if (!peer)
2266                         continue;
2267
2268                 if (dynamic_cast<UDPPeer*>(&peer) == 0)
2269                         continue;
2270
2271                 for(u16 i=0; i<CHANNEL_COUNT; i++)
2272                 {
2273                         Channel *channel = &(dynamic_cast<UDPPeer*>(&peer))->channels[i];
2274
2275                         if (checkIncomingBuffers(channel, peer_id, dst)) {
2276                                 return true;
2277                         }
2278                 }
2279         }
2280         return false;
2281 }
2282
2283 bool ConnectionReceiveThread::checkIncomingBuffers(Channel *channel,
2284                 u16 &peer_id, SharedBuffer<u8> &dst)
2285 {
2286         u16 firstseqnum = 0;
2287         if (channel->incoming_reliables.getFirstSeqnum(firstseqnum))
2288         {
2289                 if (firstseqnum == channel->readNextIncomingSeqNum())
2290                 {
2291                         BufferedPacket p = channel->incoming_reliables.popFirst();
2292                         peer_id = readPeerId(*p.data);
2293                         u8 channelnum = readChannel(*p.data);
2294                         u16 seqnum = readU16(&p.data[BASE_HEADER_SIZE+1]);
2295
2296                         LOG(dout_con<<m_connection->getDesc()
2297                                         <<"UNBUFFERING TYPE_RELIABLE"
2298                                         <<" seqnum="<<seqnum
2299                                         <<" peer_id="<<peer_id
2300                                         <<" channel="<<((int)channelnum&0xff)
2301                                         <<std::endl);
2302
2303                         channel->incNextIncomingSeqNum();
2304
2305                         u32 headers_size = BASE_HEADER_SIZE + RELIABLE_HEADER_SIZE;
2306                         // Get out the inside packet and re-process it
2307                         SharedBuffer<u8> payload(p.data.getSize() - headers_size);
2308                         memcpy(*payload, &p.data[headers_size], payload.getSize());
2309
2310                         dst = processPacket(channel, payload, peer_id, channelnum, true);
2311                         return true;
2312                 }
2313         }
2314         return false;
2315 }
2316
2317 SharedBuffer<u8> ConnectionReceiveThread::processPacket(Channel *channel,
2318                 SharedBuffer<u8> packetdata, u16 peer_id, u8 channelnum, bool reliable)
2319 {
2320         PeerHelper peer = m_connection->getPeerNoEx(peer_id);
2321
2322         if (!peer) {
2323                 errorstream << "Peer not found (possible timeout)" << std::endl;
2324                 throw ProcessedSilentlyException("Peer not found (possible timeout)");
2325         }
2326
2327         if (packetdata.getSize() < 1)
2328                 throw InvalidIncomingDataException("packetdata.getSize() < 1");
2329
2330         u8 type = readU8(&(packetdata[0]));
2331
2332         if (MAX_UDP_PEERS <= 65535 && peer_id >= MAX_UDP_PEERS) {
2333                 errorstream << "Something is wrong with peer_id" << std::endl;
2334                 assert(0);
2335         }
2336
2337         if (type == TYPE_CONTROL)
2338         {
2339                 if (packetdata.getSize() < 2)
2340                         throw InvalidIncomingDataException("packetdata.getSize() < 2");
2341
2342                 u8 controltype = readU8(&(packetdata[1]));
2343
2344                 if (controltype == CONTROLTYPE_ACK)
2345                 {
2346                         assert(channel != 0);
2347                         if (packetdata.getSize() < 4)
2348                                 throw InvalidIncomingDataException
2349                                                 ("packetdata.getSize() < 4 (ACK header size)");
2350
2351                         u16 seqnum = readU16(&packetdata[2]);
2352                         LOG(dout_con<<m_connection->getDesc()
2353                                         <<" [ CONTROLTYPE_ACK: channelnum="
2354                                         <<((int)channelnum&0xff)<<", peer_id="<<peer_id
2355                                         <<", seqnum="<<seqnum<< " ]"<<std::endl);
2356
2357                         try{
2358                                 BufferedPacket p =
2359                                                 channel->outgoing_reliables_sent.popSeqnum(seqnum);
2360
2361                                 // only calculate rtt from straight sent packets
2362                                 if (p.resend_count == 0) {
2363                                         // Get round trip time
2364                                         unsigned int current_time = porting::getTimeMs();
2365
2366                                         // a overflow is quite unlikely but as it'd result in major
2367                                         // rtt miscalculation we handle it here
2368                                         if (current_time > p.absolute_send_time)
2369                                         {
2370                                                 float rtt = (current_time - p.absolute_send_time) / 1000.0;
2371
2372                                                 // Let peer calculate stuff according to it
2373                                                 // (avg_rtt and resend_timeout)
2374                                                 dynamic_cast<UDPPeer*>(&peer)->reportRTT(rtt);
2375                                         }
2376                                         else if (p.totaltime > 0)
2377                                         {
2378                                                 float rtt = p.totaltime;
2379
2380                                                 // Let peer calculate stuff according to it
2381                                                 // (avg_rtt and resend_timeout)
2382                                                 dynamic_cast<UDPPeer*>(&peer)->reportRTT(rtt);
2383                                         }
2384                                 }
2385                                 //put bytes for max bandwidth calculation
2386                                 channel->UpdateBytesSent(p.data.getSize(),1);
2387                                 if (channel->outgoing_reliables_sent.size() == 0)
2388                                 {
2389                                         m_connection->TriggerSend();
2390                                 }
2391                         }
2392                         catch(NotFoundException &e) {
2393                                 LOG(derr_con<<m_connection->getDesc()
2394                                                 <<"WARNING: ACKed packet not "
2395                                                 "in outgoing queue"
2396                                                 <<std::endl);
2397                                 channel->UpdatePacketTooLateCounter();
2398                         }
2399                         throw ProcessedSilentlyException("Got an ACK");
2400                 }
2401                 else if (controltype == CONTROLTYPE_SET_PEER_ID) {
2402                         // Got a packet to set our peer id
2403                         if (packetdata.getSize() < 4)
2404                                 throw InvalidIncomingDataException
2405                                                 ("packetdata.getSize() < 4 (SET_PEER_ID header size)");
2406                         u16 peer_id_new = readU16(&packetdata[2]);
2407                         LOG(dout_con<<m_connection->getDesc()
2408                                         <<"Got new peer id: "<<peer_id_new<<"... "<<std::endl);
2409
2410                         if (m_connection->GetPeerID() != PEER_ID_INEXISTENT)
2411                         {
2412                                 LOG(derr_con<<m_connection->getDesc()
2413                                                 <<"WARNING: Not changing"
2414                                                 " existing peer id."<<std::endl);
2415                         }
2416                         else
2417                         {
2418                                 LOG(dout_con<<m_connection->getDesc()<<"changing own peer id"<<std::endl);
2419                                 m_connection->SetPeerID(peer_id_new);
2420                         }
2421
2422                         ConnectionCommand cmd;
2423
2424                         SharedBuffer<u8> reply(2);
2425                         writeU8(&reply[0], TYPE_CONTROL);
2426                         writeU8(&reply[1], CONTROLTYPE_ENABLE_BIG_SEND_WINDOW);
2427                         cmd.disableLegacy(PEER_ID_SERVER,reply);
2428                         m_connection->putCommand(cmd);
2429
2430                         throw ProcessedSilentlyException("Got a SET_PEER_ID");
2431                 }
2432                 else if (controltype == CONTROLTYPE_PING)
2433                 {
2434                         // Just ignore it, the incoming data already reset
2435                         // the timeout counter
2436                         LOG(dout_con<<m_connection->getDesc()<<"PING"<<std::endl);
2437                         throw ProcessedSilentlyException("Got a PING");
2438                 }
2439                 else if (controltype == CONTROLTYPE_DISCO)
2440                 {
2441                         // Just ignore it, the incoming data already reset
2442                         // the timeout counter
2443                         LOG(dout_con<<m_connection->getDesc()
2444                                         <<"DISCO: Removing peer "<<(peer_id)<<std::endl);
2445
2446                         if (m_connection->deletePeer(peer_id, false) == false)
2447                         {
2448                                 derr_con<<m_connection->getDesc()
2449                                                 <<"DISCO: Peer not found"<<std::endl;
2450                         }
2451
2452                         throw ProcessedSilentlyException("Got a DISCO");
2453                 }
2454                 else if (controltype == CONTROLTYPE_ENABLE_BIG_SEND_WINDOW)
2455                 {
2456                         dynamic_cast<UDPPeer*>(&peer)->setNonLegacyPeer();
2457                         throw ProcessedSilentlyException("Got non legacy control");
2458                 }
2459                 else{
2460                         LOG(derr_con<<m_connection->getDesc()
2461                                         <<"INVALID TYPE_CONTROL: invalid controltype="
2462                                         <<((int)controltype&0xff)<<std::endl);
2463                         throw InvalidIncomingDataException("Invalid control type");
2464                 }
2465         }
2466         else if (type == TYPE_ORIGINAL)
2467         {
2468                 if (packetdata.getSize() <= ORIGINAL_HEADER_SIZE)
2469                         throw InvalidIncomingDataException
2470                                         ("packetdata.getSize() <= ORIGINAL_HEADER_SIZE");
2471                 LOG(dout_con<<m_connection->getDesc()
2472                                 <<"RETURNING TYPE_ORIGINAL to user"
2473                                 <<std::endl);
2474                 // Get the inside packet out and return it
2475                 SharedBuffer<u8> payload(packetdata.getSize() - ORIGINAL_HEADER_SIZE);
2476                 memcpy(*payload, &(packetdata[ORIGINAL_HEADER_SIZE]), payload.getSize());
2477                 return payload;
2478         }
2479         else if (type == TYPE_SPLIT)
2480         {
2481                 Address peer_address;
2482
2483                 if (peer->getAddress(MTP_UDP, peer_address)) {
2484
2485                         // We have to create a packet again for buffering
2486                         // This isn't actually too bad an idea.
2487                         BufferedPacket packet = makePacket(
2488                                         peer_address,
2489                                         packetdata,
2490                                         m_connection->GetProtocolID(),
2491                                         peer_id,
2492                                         channelnum);
2493
2494                         // Buffer the packet
2495                         SharedBuffer<u8> data =
2496                                         peer->addSpiltPacket(channelnum,packet,reliable);
2497
2498                         if (data.getSize() != 0)
2499                         {
2500                                 LOG(dout_con<<m_connection->getDesc()
2501                                                 <<"RETURNING TYPE_SPLIT: Constructed full data, "
2502                                                 <<"size="<<data.getSize()<<std::endl);
2503                                 return data;
2504                         }
2505                         LOG(dout_con<<m_connection->getDesc()<<"BUFFERED TYPE_SPLIT"<<std::endl);
2506                         throw ProcessedSilentlyException("Buffered a split packet chunk");
2507                 }
2508                 else {
2509                         //TODO throw some error
2510                 }
2511         }
2512         else if (type == TYPE_RELIABLE)
2513         {
2514                 assert(channel != 0);
2515                 // Recursive reliable packets not allowed
2516                 if (reliable)
2517                         throw InvalidIncomingDataException("Found nested reliable packets");
2518
2519                 if (packetdata.getSize() < RELIABLE_HEADER_SIZE)
2520                         throw InvalidIncomingDataException
2521                                         ("packetdata.getSize() < RELIABLE_HEADER_SIZE");
2522
2523                 u16 seqnum = readU16(&packetdata[1]);
2524                 bool is_future_packet = false;
2525                 bool is_old_packet = false;
2526
2527                 /* packet is within our receive window send ack */
2528                 if (seqnum_in_window(seqnum, channel->readNextIncomingSeqNum(),MAX_RELIABLE_WINDOW_SIZE))
2529                 {
2530                         m_connection->sendAck(peer_id,channelnum,seqnum);
2531                 }
2532                 else {
2533                         is_future_packet = seqnum_higher(seqnum, channel->readNextIncomingSeqNum());
2534                         is_old_packet    = seqnum_higher(channel->readNextIncomingSeqNum(), seqnum);
2535
2536
2537                         /* packet is not within receive window, don't send ack.           *
2538                          * if this was a valid packet it's gonna be retransmitted         */
2539                         if (is_future_packet)
2540                         {
2541                                 throw ProcessedSilentlyException("Received packet newer then expected, not sending ack");
2542                         }
2543
2544                         /* seems like our ack was lost, send another one for a old packet */
2545                         if (is_old_packet)
2546                         {
2547                                 LOG(dout_con<<m_connection->getDesc()
2548                                                 << "RE-SENDING ACK: peer_id: " << peer_id
2549                                                 << ", channel: " << (channelnum&0xFF)
2550                                                 << ", seqnum: " << seqnum << std::endl;)
2551                                 m_connection->sendAck(peer_id,channelnum,seqnum);
2552
2553                                 // we already have this packet so this one was on wire at least
2554                                 // the current timeout
2555                                 // we don't know how long this packet was on wire don't do silly guessing
2556                                 // dynamic_cast<UDPPeer*>(&peer)->reportRTT(dynamic_cast<UDPPeer*>(&peer)->getResendTimeout());
2557
2558                                 throw ProcessedSilentlyException("Retransmitting ack for old packet");
2559                         }
2560                 }
2561
2562                 if (seqnum != channel->readNextIncomingSeqNum())
2563                 {
2564                         Address peer_address;
2565
2566                         // this is a reliable packet so we have a udp address for sure
2567                         peer->getAddress(MTP_MINETEST_RELIABLE_UDP, peer_address);
2568                         // This one comes later, buffer it.
2569                         // Actually we have to make a packet to buffer one.
2570                         // Well, we have all the ingredients, so just do it.
2571                         BufferedPacket packet = con::makePacket(
2572                                         peer_address,
2573                                         packetdata,
2574                                         m_connection->GetProtocolID(),
2575                                         peer_id,
2576                                         channelnum);
2577                         try{
2578                                 channel->incoming_reliables.insert(packet,channel->readNextIncomingSeqNum());
2579
2580                                 LOG(dout_con<<m_connection->getDesc()
2581                                                 << "BUFFERING, TYPE_RELIABLE peer_id: " << peer_id
2582                                                 << ", channel: " << (channelnum&0xFF)
2583                                                 << ", seqnum: " << seqnum << std::endl;)
2584
2585                                 throw ProcessedQueued("Buffered future reliable packet");
2586                         }
2587                         catch(AlreadyExistsException &e)
2588                         {
2589                         }
2590                         catch(IncomingDataCorruption &e)
2591                         {
2592                                 ConnectionCommand discon;
2593                                 discon.disconnect_peer(peer_id);
2594                                 m_connection->putCommand(discon);
2595
2596                                 LOG(derr_con<<m_connection->getDesc()
2597                                                 << "INVALID, TYPE_RELIABLE peer_id: " << peer_id
2598                                                 << ", channel: " << (channelnum&0xFF)
2599                                                 << ", seqnum: " << seqnum
2600                                                 << "DROPPING CLIENT!" << std::endl;)
2601                         }
2602                 }
2603
2604                 /* we got a packet to process right now */
2605                 LOG(dout_con<<m_connection->getDesc()
2606                                 << "RECURSIVE, TYPE_RELIABLE peer_id: " << peer_id
2607                                 << ", channel: " << (channelnum&0xFF)
2608                                 << ", seqnum: " << seqnum << std::endl;)
2609
2610
2611                 /* check for resend case */
2612                 u16 queued_seqnum = 0;
2613                 if (channel->incoming_reliables.getFirstSeqnum(queued_seqnum))
2614                 {
2615                         if (queued_seqnum == seqnum)
2616                         {
2617                                 BufferedPacket queued_packet = channel->incoming_reliables.popFirst();
2618                                 /** TODO find a way to verify the new against the old packet */
2619                         }
2620                 }
2621
2622                 channel->incNextIncomingSeqNum();
2623
2624                 // Get out the inside packet and re-process it
2625                 SharedBuffer<u8> payload(packetdata.getSize() - RELIABLE_HEADER_SIZE);
2626                 memcpy(*payload, &packetdata[RELIABLE_HEADER_SIZE], payload.getSize());
2627
2628                 return processPacket(channel, payload, peer_id, channelnum, true);
2629         }
2630         else
2631         {
2632                 derr_con<<m_connection->getDesc()
2633                                 <<"Got invalid type="<<((int)type&0xff)<<std::endl;
2634                 throw InvalidIncomingDataException("Invalid packet type");
2635         }
2636
2637         // We should never get here.
2638         // If you get here, add an exception or a return to some of the
2639         // above conditionals.
2640         assert(0);
2641         throw BaseException("Error in Channel::ProcessPacket()");
2642 }
2643
2644 /*
2645         Connection
2646 */
2647
2648 Connection::Connection(u32 protocol_id, u32 max_packet_size, float timeout,
2649                 bool ipv6) :
2650         m_udpSocket(ipv6),
2651         m_command_queue(),
2652         m_event_queue(),
2653         m_peer_id(0),
2654         m_protocol_id(protocol_id),
2655         m_sendThread(max_packet_size, timeout),
2656         m_receiveThread(max_packet_size),
2657         m_info_mutex(),
2658         m_bc_peerhandler(0),
2659         m_bc_receive_timeout(0),
2660         m_shutting_down(false),
2661         m_next_remote_peer_id(2)
2662 {
2663         m_udpSocket.setTimeoutMs(5);
2664
2665         m_sendThread.setParent(this);
2666         m_receiveThread.setParent(this);
2667
2668         m_sendThread.Start();
2669         m_receiveThread.Start();
2670 }
2671
2672 Connection::Connection(u32 protocol_id, u32 max_packet_size, float timeout,
2673                 bool ipv6, PeerHandler *peerhandler) :
2674         m_udpSocket(ipv6),
2675         m_command_queue(),
2676         m_event_queue(),
2677         m_peer_id(0),
2678         m_protocol_id(protocol_id),
2679         m_sendThread(max_packet_size, timeout),
2680         m_receiveThread(max_packet_size),
2681         m_info_mutex(),
2682         m_bc_peerhandler(peerhandler),
2683         m_bc_receive_timeout(0),
2684         m_shutting_down(false),
2685         m_next_remote_peer_id(2)
2686
2687 {
2688         m_udpSocket.setTimeoutMs(5);
2689
2690         m_sendThread.setParent(this);
2691         m_receiveThread.setParent(this);
2692
2693         m_sendThread.Start();
2694         m_receiveThread.Start();
2695
2696 }
2697
2698
2699 Connection::~Connection()
2700 {
2701         m_shutting_down = true;
2702         // request threads to stop
2703         m_sendThread.Stop();
2704         m_receiveThread.Stop();
2705
2706         //TODO for some unkonwn reason send/receive threads do not exit as they're
2707         // supposed to be but wait on peer timeout. To speed up shutdown we reduce
2708         // timeout to half a second.
2709         m_sendThread.setPeerTimeout(0.5);
2710
2711         // wait for threads to finish
2712         m_sendThread.Wait();
2713         m_receiveThread.Wait();
2714
2715         // Delete peers
2716         for(std::map<u16, Peer*>::iterator
2717                         j = m_peers.begin();
2718                         j != m_peers.end(); ++j)
2719         {
2720                 delete j->second;
2721         }
2722 }
2723
2724 /* Internal stuff */
2725 void Connection::putEvent(ConnectionEvent &e)
2726 {
2727         assert(e.type != CONNEVENT_NONE);
2728         m_event_queue.push_back(e);
2729 }
2730
2731 PeerHelper Connection::getPeer(u16 peer_id)
2732 {
2733         JMutexAutoLock peerlock(m_peers_mutex);
2734         std::map<u16, Peer*>::iterator node = m_peers.find(peer_id);
2735
2736         if (node == m_peers.end()) {
2737                 throw PeerNotFoundException("GetPeer: Peer not found (possible timeout)");
2738         }
2739
2740         // Error checking
2741         assert(node->second->id == peer_id);
2742
2743         return PeerHelper(node->second);
2744 }
2745
2746 PeerHelper Connection::getPeerNoEx(u16 peer_id)
2747 {
2748         JMutexAutoLock peerlock(m_peers_mutex);
2749         std::map<u16, Peer*>::iterator node = m_peers.find(peer_id);
2750
2751         if (node == m_peers.end()) {
2752                 return PeerHelper(NULL);
2753         }
2754
2755         // Error checking
2756         assert(node->second->id == peer_id);
2757
2758         return PeerHelper(node->second);
2759 }
2760
2761 /* find peer_id for address */
2762 u16 Connection::lookupPeer(Address& sender)
2763 {
2764         JMutexAutoLock peerlock(m_peers_mutex);
2765         std::map<u16, Peer*>::iterator j;
2766         j = m_peers.begin();
2767         for(; j != m_peers.end(); ++j)
2768         {
2769                 Peer *peer = j->second;
2770                 if (peer->isActive())
2771                         continue;
2772
2773                 Address tocheck;
2774
2775                 if ((peer->getAddress(MTP_MINETEST_RELIABLE_UDP, tocheck)) && (tocheck == sender))
2776                         return peer->id;
2777
2778                 if ((peer->getAddress(MTP_UDP, tocheck)) && (tocheck == sender))
2779                         return peer->id;
2780         }
2781
2782         return PEER_ID_INEXISTENT;
2783 }
2784
2785 std::list<Peer*> Connection::getPeers()
2786 {
2787         std::list<Peer*> list;
2788         for(std::map<u16, Peer*>::iterator j = m_peers.begin();
2789                 j != m_peers.end(); ++j)
2790         {
2791                 Peer *peer = j->second;
2792                 list.push_back(peer);
2793         }
2794         return list;
2795 }
2796
2797 bool Connection::deletePeer(u16 peer_id, bool timeout)
2798 {
2799         Peer *peer = 0;
2800
2801         /* lock list as short as possible */
2802         {
2803                 JMutexAutoLock peerlock(m_peers_mutex);
2804                 if (m_peers.find(peer_id) == m_peers.end())
2805                         return false;
2806                 peer = m_peers[peer_id];
2807                 m_peers.erase(peer_id);
2808                 m_peer_ids.remove(peer_id);
2809         }
2810
2811         Address peer_address;
2812         //any peer has a primary address this never fails!
2813         peer->getAddress(MTP_PRIMARY, peer_address);
2814         // Create event
2815         ConnectionEvent e;
2816         e.peerRemoved(peer_id, timeout, peer_address);
2817         putEvent(e);
2818
2819
2820         peer->Drop();
2821         return true;
2822 }
2823
2824 /* Interface */
2825
2826 ConnectionEvent Connection::getEvent()
2827 {
2828         if (m_event_queue.empty()) {
2829                 ConnectionEvent e;
2830                 e.type = CONNEVENT_NONE;
2831                 return e;
2832         }
2833         return m_event_queue.pop_frontNoEx();
2834 }
2835
2836 ConnectionEvent Connection::waitEvent(u32 timeout_ms)
2837 {
2838         try {
2839                 return m_event_queue.pop_front(timeout_ms);
2840         } catch(ItemNotFoundException &ex) {
2841                 ConnectionEvent e;
2842                 e.type = CONNEVENT_NONE;
2843                 return e;
2844         }
2845 }
2846
2847 void Connection::putCommand(ConnectionCommand &c)
2848 {
2849         if (!m_shutting_down) {
2850                 m_command_queue.push_back(c);
2851                 m_sendThread.Trigger();
2852         }
2853 }
2854
2855 void Connection::Serve(Address bind_addr)
2856 {
2857         ConnectionCommand c;
2858         c.serve(bind_addr);
2859         putCommand(c);
2860 }
2861
2862 void Connection::Connect(Address address)
2863 {
2864         ConnectionCommand c;
2865         c.connect(address);
2866         putCommand(c);
2867 }
2868
2869 bool Connection::Connected()
2870 {
2871         JMutexAutoLock peerlock(m_peers_mutex);
2872
2873         if (m_peers.size() != 1)
2874                 return false;
2875
2876         std::map<u16, Peer*>::iterator node = m_peers.find(PEER_ID_SERVER);
2877         if (node == m_peers.end())
2878                 return false;
2879
2880         if (m_peer_id == PEER_ID_INEXISTENT)
2881                 return false;
2882
2883         return true;
2884 }
2885
2886 void Connection::Disconnect()
2887 {
2888         ConnectionCommand c;
2889         c.disconnect();
2890         putCommand(c);
2891 }
2892
2893 u32 Connection::Receive(u16 &peer_id, SharedBuffer<u8> &data)
2894 {
2895         for(;;) {
2896                 ConnectionEvent e = waitEvent(m_bc_receive_timeout);
2897                 if (e.type != CONNEVENT_NONE)
2898                         LOG(dout_con<<getDesc()<<": Receive: got event: "
2899                                         <<e.describe()<<std::endl);
2900                 switch(e.type) {
2901                 case CONNEVENT_NONE:
2902                         throw NoIncomingDataException("No incoming data");
2903                 case CONNEVENT_DATA_RECEIVED:
2904                         peer_id = e.peer_id;
2905                         data = SharedBuffer<u8>(e.data);
2906                         return e.data.getSize();
2907                 case CONNEVENT_PEER_ADDED: {
2908                         UDPPeer tmp(e.peer_id, e.address, this);
2909                         if (m_bc_peerhandler)
2910                                 m_bc_peerhandler->peerAdded(&tmp);
2911                         continue; }
2912                 case CONNEVENT_PEER_REMOVED: {
2913                         UDPPeer tmp(e.peer_id, e.address, this);
2914                         if (m_bc_peerhandler)
2915                                 m_bc_peerhandler->deletingPeer(&tmp, e.timeout);
2916                         continue; }
2917                 case CONNEVENT_BIND_FAILED:
2918                         throw ConnectionBindFailed("Failed to bind socket "
2919                                         "(port already in use?)");
2920                 }
2921         }
2922         throw NoIncomingDataException("No incoming data");
2923 }
2924
2925 void Connection::Send(u16 peer_id, u8 channelnum,
2926                 NetworkPacket* pkt, bool reliable)
2927 {
2928         assert(channelnum < CHANNEL_COUNT);
2929
2930         ConnectionCommand c;
2931
2932         c.send(peer_id, channelnum, pkt->oldForgePacket(), reliable);
2933         putCommand(c);
2934 }
2935
2936 Address Connection::GetPeerAddress(u16 peer_id)
2937 {
2938         PeerHelper peer = getPeerNoEx(peer_id);
2939
2940         if (!peer)
2941                 throw PeerNotFoundException("No address for peer found!");
2942         Address peer_address;
2943         peer->getAddress(MTP_PRIMARY, peer_address);
2944         return peer_address;
2945 }
2946
2947 float Connection::getPeerStat(u16 peer_id, rtt_stat_type type)
2948 {
2949         PeerHelper peer = getPeerNoEx(peer_id);
2950         if (!peer) return -1;
2951         return peer->getStat(type);
2952 }
2953
2954 float Connection::getLocalStat(rate_stat_type type)
2955 {
2956         PeerHelper peer = getPeerNoEx(PEER_ID_SERVER);
2957
2958         if (!peer) {
2959                 assert("Connection::getLocalStat we couldn't get our own peer? are you serious???" == 0);
2960         }
2961
2962         float retval = 0.0;
2963
2964         for (u16 j=0; j<CHANNEL_COUNT; j++) {
2965                 switch(type) {
2966                         case CUR_DL_RATE:
2967                                 retval += dynamic_cast<UDPPeer*>(&peer)->channels[j].getCurrentDownloadRateKB();
2968                                 break;
2969                         case AVG_DL_RATE:
2970                                 retval += dynamic_cast<UDPPeer*>(&peer)->channels[j].getAvgDownloadRateKB();
2971                                 break;
2972                         case CUR_INC_RATE:
2973                                 retval += dynamic_cast<UDPPeer*>(&peer)->channels[j].getCurrentIncomingRateKB();
2974                                 break;
2975                         case AVG_INC_RATE:
2976                                 retval += dynamic_cast<UDPPeer*>(&peer)->channels[j].getAvgIncomingRateKB();
2977                                 break;
2978                         case AVG_LOSS_RATE:
2979                                 retval += dynamic_cast<UDPPeer*>(&peer)->channels[j].getAvgLossRateKB();
2980                                 break;
2981                         case CUR_LOSS_RATE:
2982                                 retval += dynamic_cast<UDPPeer*>(&peer)->channels[j].getCurrentLossRateKB();
2983                                 break;
2984                 default:
2985                         assert("Connection::getLocalStat Invalid stat type" == 0);
2986                 }
2987         }
2988         return retval;
2989 }
2990
2991 u16 Connection::createPeer(Address& sender, MTProtocols protocol, int fd)
2992 {
2993         // Somebody wants to make a new connection
2994
2995         // Get a unique peer id (2 or higher)
2996         u16 peer_id_new = m_next_remote_peer_id;
2997         u16 overflow =  MAX_UDP_PEERS;
2998
2999         /*
3000                 Find an unused peer id
3001         */
3002         JMutexAutoLock lock(m_peers_mutex);
3003         bool out_of_ids = false;
3004         for(;;) {
3005                 // Check if exists
3006                 if (m_peers.find(peer_id_new) == m_peers.end())
3007
3008                         break;
3009                 // Check for overflow
3010                 if (peer_id_new == overflow) {
3011                         out_of_ids = true;
3012                         break;
3013                 }
3014                 peer_id_new++;
3015         }
3016
3017         if (out_of_ids) {
3018                 errorstream << getDesc() << " ran out of peer ids" << std::endl;
3019                 return PEER_ID_INEXISTENT;
3020         }
3021
3022         // Create a peer
3023         Peer *peer = 0;
3024         peer = new UDPPeer(peer_id_new, sender, this);
3025
3026         m_peers[peer->id] = peer;
3027         m_peer_ids.push_back(peer->id);
3028
3029         m_next_remote_peer_id = (peer_id_new +1 ) % MAX_UDP_PEERS;
3030
3031         LOG(dout_con << getDesc()
3032                         << "createPeer(): giving peer_id=" << peer_id_new << std::endl);
3033
3034         ConnectionCommand cmd;
3035         SharedBuffer<u8> reply(4);
3036         writeU8(&reply[0], TYPE_CONTROL);
3037         writeU8(&reply[1], CONTROLTYPE_SET_PEER_ID);
3038         writeU16(&reply[2], peer_id_new);
3039         cmd.createPeer(peer_id_new,reply);
3040         putCommand(cmd);
3041
3042         // Create peer addition event
3043         ConnectionEvent e;
3044         e.peerAdded(peer_id_new, sender);
3045         putEvent(e);
3046
3047         // We're now talking to a valid peer_id
3048         return peer_id_new;
3049 }
3050
3051 void Connection::PrintInfo(std::ostream &out)
3052 {
3053         m_info_mutex.Lock();
3054         out<<getDesc()<<": ";
3055         m_info_mutex.Unlock();
3056 }
3057
3058 void Connection::PrintInfo()
3059 {
3060         PrintInfo(dout_con);
3061 }
3062
3063 const std::string Connection::getDesc()
3064 {
3065         return std::string("con(")+
3066                         itos(m_udpSocket.GetHandle())+"/"+itos(m_peer_id)+")";
3067 }
3068
3069 void Connection::DisconnectPeer(u16 peer_id)
3070 {
3071         ConnectionCommand discon;
3072         discon.disconnect_peer(peer_id);
3073         putCommand(discon);
3074 }
3075
3076 void Connection::sendAck(u16 peer_id, u8 channelnum, u16 seqnum)
3077 {
3078         assert(channelnum < CHANNEL_COUNT);
3079
3080         LOG(dout_con<<getDesc()
3081                         <<" Queuing ACK command to peer_id: " << peer_id <<
3082                         " channel: " << (channelnum & 0xFF) <<
3083                         " seqnum: " << seqnum << std::endl);
3084
3085         ConnectionCommand c;
3086         SharedBuffer<u8> ack(4);
3087         writeU8(&ack[0], TYPE_CONTROL);
3088         writeU8(&ack[1], CONTROLTYPE_ACK);
3089         writeU16(&ack[2], seqnum);
3090
3091         c.ack(peer_id, channelnum, ack);
3092         putCommand(c);
3093         m_sendThread.Trigger();
3094 }
3095
3096 UDPPeer* Connection::createServerPeer(Address& address)
3097 {
3098         if (getPeerNoEx(PEER_ID_SERVER) != 0)
3099         {
3100                 throw ConnectionException("Already connected to a server");
3101         }
3102
3103         UDPPeer *peer = new UDPPeer(PEER_ID_SERVER, address, this);
3104
3105         {
3106                 JMutexAutoLock lock(m_peers_mutex);
3107                 m_peers[peer->id] = peer;
3108                 m_peer_ids.push_back(peer->id);
3109         }
3110
3111         return peer;
3112 }
3113
3114 } // namespace