net.h

   1 // Copyright (c) 2009-2010 Satoshi Nakamoto
   2 // Distributed under the MIT/X11 software license, see the accompanying
   3 // file license.txt or http://www.opensource.org/licenses/mit-license.php.
   4
   5 class CMessageHeader;
   6 class CAddress;
   7 class CInv;
   8 class CRequestTracker;
   9 class CNode;
  10 class CBlockIndex;
  11 extern int nBestHeight;
  12
  13
  14
  15 inline unsigned short GetDefaultPort() { return fTestNet ? htons(18333) : htons(8333); }
  16 static const unsigned int PUBLISH_HOPS = 5;
  17 enum
  18 {
  19     NODE_NETWORK = (1 << 0),
  20 };
  21
  22
  23
  24
  25 bool ConnectSocket(const CAddress& addrConnect, SOCKET& hSocketRet);
  26 bool GetMyExternalIP(unsigned int& ipRet);
  27 bool AddAddress(CAddress addr, int64 nTimePenalty=0);
  28 void AddressCurrentlyConnected(const CAddress& addr);
  29 CNode* FindNode(unsigned int ip);
  30 CNode* ConnectNode(CAddress addrConnect, int64 nTimeout=0);
  31 void AbandonRequests(void (*fn)(void*, CDataStream&), void* param1);
  32 bool AnySubscribed(unsigned int nChannel);
  33 bool BindListenPort(string& strError=REF(string()));
  34 void StartNode(void* parg);
  35 bool StopNode();
  36
  37
  38
  39
  40
  41
  42
  43
  44 //
  45 // Message header
  46 //  (4) message start
  47 //  (12) command
  48 //  (4) size
  49 //  (4) checksum
  50
  51 extern char pchMessageStart[4];
  52
  53 class CMessageHeader
  54 {
  55 public:
  56     enum { COMMAND_SIZE=12 };
  57     char pchMessageStart[sizeof(::pchMessageStart)];
  58     char pchCommand[COMMAND_SIZE];
  59     unsigned int nMessageSize;
  60     unsigned int nChecksum;
  61
  62     CMessageHeader()
  63     {
  64         memcpy(pchMessageStart, ::pchMessageStart, sizeof(pchMessageStart));
  65         memset(pchCommand, 0, sizeof(pchCommand));
  66         pchCommand[1] = 1;
  67         nMessageSize = -1;
  68         nChecksum = 0;
  69     }
  70
  71     CMessageHeader(const char* pszCommand, unsigned int nMessageSizeIn)
  72     {
  73         memcpy(pchMessageStart, ::pchMessageStart, sizeof(pchMessageStart));
  74         strncpy(pchCommand, pszCommand, COMMAND_SIZE);
  75         nMessageSize = nMessageSizeIn;
  76         nChecksum = 0;
  77     }
  78
  79     IMPLEMENT_SERIALIZE
  80     (
  81         READWRITE(FLATDATA(pchMessageStart));
  82         READWRITE(FLATDATA(pchCommand));
  83         READWRITE(nMessageSize);
  84         if (nVersion >= 209)
  85             READWRITE(nChecksum);
  86     )
  87
  88     string GetCommand()
  89     {
  90         if (pchCommand[COMMAND_SIZE-1] == 0)
  91             return string(pchCommand, pchCommand + strlen(pchCommand));
  92         else
  93             return string(pchCommand, pchCommand + COMMAND_SIZE);
  94     }
  95
  96     bool IsValid()
  97     {
  98         // Check start string
  99         if (memcmp(pchMessageStart, ::pchMessageStart, sizeof(pchMessageStart)) != 0)
 100             return false;
 101
 102         // Check the command string for errors
 103         for (char* p1 = pchCommand; p1 < pchCommand + COMMAND_SIZE; p1++)
 104         {
 105             if (*p1 == 0)
 106             {
 107                 // Must be all zeros after the first zero
 108                 for (; p1 < pchCommand + COMMAND_SIZE; p1++)
 109                     if (*p1 != 0)
 110                         return false;
 111             }
 112             else if (*p1 < ' ' || *p1 > 0x7E)
 113                 return false;
 114         }
 115
 116         // Message size
 117         if (nMessageSize > MAX_SIZE)
 118         {
 119             printf("CMessageHeader::IsValid() : (%s, %u bytes) nMessageSize > MAX_SIZE\n", GetCommand().c_str(), nMessageSize);
 120             return false;
 121         }
 122
 123         return true;
 124     }
 125 };
 126
 127
 128
 129
 130
 131
 132 static const unsigned char pchIPv4[12] = { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0xff, 0xff };
 133
 134 class CAddress
 135 {
 136 public:
 137     uint64 nServices;
 138     unsigned char pchReserved[12];
 139     unsigned int ip;
 140     unsigned short port;
 141
 142     // disk and network only
 143     unsigned int nTime;
 144
 145     // memory only
 146     unsigned int nLastTry;
 147
 148     CAddress()
 149     {
 150         Init();
 151     }
 152
 153     CAddress(unsigned int ipIn, unsigned short portIn=0, uint64 nServicesIn=NODE_NETWORK)
 154     {
 155         Init();
 156         ip = ipIn;
 157         port = (portIn == 0 ? GetDefaultPort() : portIn);
 158         nServices = nServicesIn;
 159     }
 160
 161     explicit CAddress(const struct sockaddr_in& sockaddr, uint64 nServicesIn=NODE_NETWORK)
 162     {
 163         Init();
 164         ip = sockaddr.sin_addr.s_addr;
 165         port = sockaddr.sin_port;
 166         nServices = nServicesIn;
 167     }
 168
 169     explicit CAddress(const char* pszIn, uint64 nServicesIn=NODE_NETWORK)
 170     {
 171         Init();
 172         SetAddress(pszIn);
 173         nServices = nServicesIn;
 174     }
 175
 176     explicit CAddress(string strIn, uint64 nServicesIn=NODE_NETWORK)
 177     {
 178         Init();
 179         SetAddress(strIn.c_str());
 180         nServices = nServicesIn;
 181     }
 182
 183     void Init()
 184     {
 185         nServices = NODE_NETWORK;
 186         memcpy(pchReserved, pchIPv4, sizeof(pchReserved));
 187         ip = INADDR_NONE;
 188         port = GetDefaultPort();
 189         nTime = 100000000;
 190         nLastTry = 0;
 191     }
 192
 193     bool SetAddress(const char* pszIn)
 194     {
 195         ip = INADDR_NONE;
 196         port = GetDefaultPort();
 197         char psz[100];
 198         strlcpy(psz, pszIn, sizeof(psz));
 199         unsigned int a=0, b=0, c=0, d=0, e=0;
 200         if (sscanf(psz, "%u.%u.%u.%u:%u", &a, &b, &c, &d, &e) < 4)
 201             return false;
 202         char* pszPort = strchr(psz, ':');
 203         if (pszPort)
 204         {
 205             *pszPort++ = '\0';
 206             port = htons(atoi(pszPort));
 207             if (atoi(pszPort) < 0 || atoi(pszPort) > USHRT_MAX)
 208                 port = htons(USHRT_MAX);
 209         }
 210         ip = inet_addr(psz);
 211         return IsValid();
 212     }
 213
 214     bool SetAddress(string strIn)
 215     {
 216         return SetAddress(strIn.c_str());
 217     }
 218
 219     IMPLEMENT_SERIALIZE
 220     (
 221         if (fRead)
 222             const_cast<CAddress*>(this)->Init();
 223         if (nType & SER_DISK)
 224             READWRITE(nVersion);
 225         if ((nType & SER_DISK) || (nVersion >= 31402 && !(nType & SER_GETHASH)))
 226             READWRITE(nTime);
 227         READWRITE(nServices);
 228         READWRITE(FLATDATA(pchReserved)); // for IPv6
 229         READWRITE(ip);
 230         READWRITE(port);
 231     )
 232
 233     friend inline bool operator==(const CAddress& a, const CAddress& b)
 234     {
 235         return (memcmp(a.pchReserved, b.pchReserved, sizeof(a.pchReserved)) == 0 &&
 236                 a.ip   == b.ip &&
 237                 a.port == b.port);
 238     }
 239
 240     friend inline bool operator!=(const CAddress& a, const CAddress& b)
 241     {
 242         return (!(a == b));
 243     }
 244
 245     friend inline bool operator<(const CAddress& a, const CAddress& b)
 246     {
 247         int ret = memcmp(a.pchReserved, b.pchReserved, sizeof(a.pchReserved));
 248         if (ret < 0)
 249             return true;
 250         else if (ret == 0)
 251         {
 252             if (ntohl(a.ip) < ntohl(b.ip))
 253                 return true;
 254             else if (a.ip == b.ip)
 255                 return ntohs(a.port) < ntohs(b.port);
 256         }
 257         return false;
 258     }
 259
 260     vector<unsigned char> GetKey() const
 261     {
 262         CDataStream ss;
 263         ss.reserve(18);
 264         ss << FLATDATA(pchReserved) << ip << port;
 265
 266         #if defined(_MSC_VER) && _MSC_VER < 1300
 267         return vector<unsigned char>((unsigned char*)&ss.begin()[0], (unsigned char*)&ss.end()[0]);
 268         #else
 269         return vector<unsigned char>(ss.begin(), ss.end());
 270         #endif
 271     }
 272
 273     struct sockaddr_in GetSockAddr() const
 274     {
 275         struct sockaddr_in sockaddr;
 276         memset(&sockaddr, 0, sizeof(sockaddr));
 277         sockaddr.sin_family = AF_INET;
 278         sockaddr.sin_addr.s_addr = ip;
 279         sockaddr.sin_port = port;
 280         return sockaddr;
 281     }
 282
 283     bool IsIPv4() const
 284     {
 285         return (memcmp(pchReserved, pchIPv4, sizeof(pchIPv4)) == 0);
 286     }
 287
 288     bool IsRoutable() const
 289     {
 290         return IsValid() &&
 291             !(GetByte(3) == 10 ||
 292               (GetByte(3) == 192 && GetByte(2) == 168) ||
 293               GetByte(3) == 127 ||
 294               GetByte(3) == 0);
 295     }
 296
 297     bool IsValid() const
 298     {
 299         // Clean up 3-byte shifted addresses caused by garbage in size field
 300         // of addr messages from versions before 0.2.9 checksum.
 301         // Two consecutive addr messages look like this:
 302         // header20 vectorlen3 addr26 addr26 addr26 header20 vectorlen3 addr26 addr26 addr26...
 303         // so if the first length field is garbled, it reads the second batch
 304         // of addr misaligned by 3 bytes.
 305         if (memcmp(pchReserved, pchIPv4+3, sizeof(pchIPv4)-3) == 0)
 306             return false;
 307
 308         return (ip != 0 && ip != INADDR_NONE && port != htons(USHRT_MAX));
 309     }
 310
 311     unsigned char GetByte(int n) const
 312     {
 313         return ((unsigned char*)&ip)[3-n];
 314     }
 315
 316     string ToStringIPPort() const
 317     {
 318         return strprintf("%u.%u.%u.%u:%u", GetByte(3), GetByte(2), GetByte(1), GetByte(0), ntohs(port));
 319     }
 320
 321     string ToStringIP() const
 322     {
 323         return strprintf("%u.%u.%u.%u", GetByte(3), GetByte(2), GetByte(1), GetByte(0));
 324     }
 325
 326     string ToStringPort() const
 327     {
 328         return strprintf("%u", ntohs(port));
 329     }
 330
 331     string ToStringLog() const
 332     {
 333         return "";
 334     }
 335
 336     string ToString() const
 337     {
 338         return strprintf("%u.%u.%u.%u:%u", GetByte(3), GetByte(2), GetByte(1), GetByte(0), ntohs(port));
 339     }
 340
 341     void print() const
 342     {
 343         printf("CAddress(%s)\n", ToString().c_str());
 344     }
 345 };
 346
 347
 348
 349
 350
 351
 352
 353 enum
 354 {
 355     MSG_TX = 1,
 356     MSG_BLOCK,
 357 };
 358
 359 static const char* ppszTypeName[] =
 360 {
 361     "ERROR",
 362     "tx",
 363     "block",
 364 };
 365
 366 class CInv
 367 {
 368 public:
 369     int type;
 370     uint256 hash;
 371
 372     CInv()
 373     {
 374         type = 0;
 375         hash = 0;
 376     }
 377
 378     CInv(int typeIn, const uint256& hashIn)
 379     {
 380         type = typeIn;
 381         hash = hashIn;
 382     }
 383
 384     CInv(const string& strType, const uint256& hashIn)
 385     {
 386         int i;
 387         for (i = 1; i < ARRAYLEN(ppszTypeName); i++)
 388         {
 389             if (strType == ppszTypeName[i])
 390             {
 391                 type = i;
 392                 break;
 393             }
 394         }
 395         if (i == ARRAYLEN(ppszTypeName))
 396             throw std::out_of_range(strprintf("CInv::CInv(string, uint256) : unknown type '%s'", strType.c_str()));
 397         hash = hashIn;
 398     }
 399
 400     IMPLEMENT_SERIALIZE
 401     (
 402         READWRITE(type);
 403         READWRITE(hash);
 404     )
 405
 406     friend inline bool operator<(const CInv& a, const CInv& b)
 407     {
 408         return (a.type < b.type || (a.type == b.type && a.hash < b.hash));
 409     }
 410
 411     bool IsKnownType() const
 412     {
 413         return (type >= 1 && type < ARRAYLEN(ppszTypeName));
 414     }
 415
 416     const char* GetCommand() const
 417     {
 418         if (!IsKnownType())
 419             throw std::out_of_range(strprintf("CInv::GetCommand() : type=%d unknown type", type));
 420         return ppszTypeName[type];
 421     }
 422
 423     string ToString() const
 424     {
 425         return strprintf("%s %s", GetCommand(), hash.ToString().substr(0,20).c_str());
 426     }
 427
 428     void print() const
 429     {
 430         printf("CInv(%s)\n", ToString().c_str());
 431     }
 432 };
 433
 434
 435
 436
 437
 438 class CRequestTracker
 439 {
 440 public:
 441     void (*fn)(void*, CDataStream&);
 442     void* param1;
 443
 444     explicit CRequestTracker(void (*fnIn)(void*, CDataStream&)=NULL, void* param1In=NULL)
 445     {
 446         fn = fnIn;
 447         param1 = param1In;
 448     }
 449
 450     bool IsNull()
 451     {
 452         return fn == NULL;
 453     }
 454 };
 455
 456
 457
 458
 459
 460 extern bool fClient;
 461 extern uint64 nLocalServices;
 462 extern CAddress addrLocalHost;
 463 extern CNode* pnodeLocalHost;
 464 extern uint64 nLocalHostNonce;
 465 extern array<int, 10> vnThreadsRunning;
 466 extern SOCKET hListenSocket;
 467
 468 extern vector<CNode*> vNodes;
 469 extern CCriticalSection cs_vNodes;
 470 extern map<vector<unsigned char>, CAddress> mapAddresses;
 471 extern CCriticalSection cs_mapAddresses;
 472 extern map<CInv, CDataStream> mapRelay;
 473 extern deque<pair<int64, CInv> > vRelayExpiration;
 474 extern CCriticalSection cs_mapRelay;
 475 extern map<CInv, int64> mapAlreadyAskedFor;
 476
 477 // Settings
 478 extern int fUseProxy;
 479 extern CAddress addrProxy;
 480
 481
 482
 483
 484
 485
 486 class CNode
 487 {
 488 public:
 489     // socket
 490     uint64 nServices;
 491     SOCKET hSocket;
 492     CDataStream vSend;
 493     CDataStream vRecv;
 494     CCriticalSection cs_vSend;
 495     CCriticalSection cs_vRecv;
 496     int64 nLastSend;
 497     int64 nLastRecv;
 498     int64 nLastSendEmpty;
 499     int64 nTimeConnected;
 500     unsigned int nHeaderStart;
 501     unsigned int nMessageStart;
 502     CAddress addr;
 503     int nVersion;
 504     string strSubVer;
 505     bool fClient;
 506     bool fInbound;
 507     bool fNetworkNode;
 508     bool fSuccessfullyConnected;
 509     bool fDisconnect;
 510 protected:
 511     int nRefCount;
 512 public:
 513     int64 nReleaseTime;
 514     map<uint256, CRequestTracker> mapRequests;
 515     CCriticalSection cs_mapRequests;
 516     uint256 hashContinue;
 517     CBlockIndex* pindexLastGetBlocksBegin;
 518     uint256 hashLastGetBlocksEnd;
 519     int nStartingHeight;
 520
 521     // flood relay
 522     vector<CAddress> vAddrToSend;
 523     set<CAddress> setAddrKnown;
 524     bool fGetAddr;
 525     set<uint256> setKnown;
 526
 527     // inventory based relay
 528     set<CInv> setInventoryKnown;
 529     vector<CInv> vInventoryToSend;
 530     CCriticalSection cs_inventory;
 531     multimap<int64, CInv> mapAskFor;
 532
 533     // publish and subscription
 534     vector<char> vfSubscribe;
 535
 536
 537     CNode(SOCKET hSocketIn, CAddress addrIn, bool fInboundIn=false)
 538     {
 539         nServices = 0;
 540         hSocket = hSocketIn;
 541         vSend.SetType(SER_NETWORK);
 542         vSend.SetVersion(0);
 543         vRecv.SetType(SER_NETWORK);
 544         vRecv.SetVersion(0);
 545         // Version 0.2 obsoletes 20 Feb 2012
 546         if (GetTime() > 1329696000)
 547         {
 548             vSend.SetVersion(209);
 549             vRecv.SetVersion(209);
 550         }
 551         nLastSend = 0;
 552         nLastRecv = 0;
 553         nLastSendEmpty = GetTime();
 554         nTimeConnected = GetTime();
 555         nHeaderStart = -1;
 556         nMessageStart = -1;
 557         addr = addrIn;
 558         nVersion = 0;
 559         strSubVer = "";
 560         fClient = false; // set by version message
 561         fInbound = fInboundIn;
 562         fNetworkNode = false;
 563         fSuccessfullyConnected = false;
 564         fDisconnect = false;
 565         nRefCount = 0;
 566         nReleaseTime = 0;
 567         hashContinue = 0;
 568         pindexLastGetBlocksBegin = 0;
 569         hashLastGetBlocksEnd = 0;
 570         nStartingHeight = -1;
 571         fGetAddr = false;
 572         vfSubscribe.assign(256, false);
 573
 574         // Push a version message
 575         /// when NTP implemented, change to just nTime = GetAdjustedTime()
 576         int64 nTime = (fInbound ? GetAdjustedTime() : GetTime());
 577         CAddress addrYou = (fUseProxy ? CAddress("0.0.0.0") : addr);
 578         CAddress addrMe = (fUseProxy ? CAddress("0.0.0.0") : addrLocalHost);
 579         RAND_bytes((unsigned char*)&nLocalHostNonce, sizeof(nLocalHostNonce));
 580         PushMessage("version", VERSION, nLocalServices, nTime, addrYou, addrMe,
 581                     nLocalHostNonce, string(pszSubVer), nBestHeight);
 582     }
 583
 584     ~CNode()
 585     {
 586         if (hSocket != INVALID_SOCKET)
 587         {
 588             closesocket(hSocket);
 589             hSocket = INVALID_SOCKET;
 590         }
 591     }
 592
 593 private:
 594     CNode(const CNode&);
 595     void operator=(const CNode&);
 596 public:
 597
 598
 599     int GetRefCount()
 600     {
 601         return max(nRefCount, 0) + (GetTime() < nReleaseTime ? 1 : 0);
 602     }
 603
 604     CNode* AddRef(int64 nTimeout=0)
 605     {
 606         if (nTimeout != 0)
 607             nReleaseTime = max(nReleaseTime, GetTime() + nTimeout);
 608         else
 609             nRefCount++;
 610         return this;
 611     }
 612
 613     void Release()
 614     {
 615         nRefCount--;
 616     }
 617
 618
 619
 620     void AddAddressKnown(const CAddress& addr)
 621     {
 622         setAddrKnown.insert(addr);
 623     }
 624
 625     void PushAddress(const CAddress& addr)
 626     {
 627         // Known checking here is only to save space from duplicates.
 628         // SendMessages will filter it again for knowns that were added
 629         // after addresses were pushed.
 630         if (addr.IsValid() && !setAddrKnown.count(addr))
 631             vAddrToSend.push_back(addr);
 632     }
 633
 634
 635     void AddInventoryKnown(const CInv& inv)
 636     {
 637         CRITICAL_BLOCK(cs_inventory)
 638             setInventoryKnown.insert(inv);
 639     }
 640
 641     void PushInventory(const CInv& inv)
 642     {
 643         CRITICAL_BLOCK(cs_inventory)
 644             if (!setInventoryKnown.count(inv))
 645                 vInventoryToSend.push_back(inv);
 646     }
 647
 648     void AskFor(const CInv& inv)
 649     {
 650         // We're using mapAskFor as a priority queue,
 651         // the key is the earliest time the request can be sent
 652         int64& nRequestTime = mapAlreadyAskedFor[inv];
 653         printf("askfor %s   %"PRI64d"\n", inv.ToString().c_str(), nRequestTime);
 654
 655         // Make sure not to reuse time indexes to keep things in the same order
 656         int64 nNow = (GetTime() - 1) * 1000000;
 657         static int64 nLastTime;
 658         nLastTime = nNow = max(nNow, ++nLastTime);
 659
 660         // Each retry is 2 minutes after the last
 661         nRequestTime = max(nRequestTime + 2 * 60 * 1000000, nNow);
 662         mapAskFor.insert(make_pair(nRequestTime, inv));
 663     }
 664
 665
 666
 667     void BeginMessage(const char* pszCommand)
 668     {
 669         cs_vSend.Enter();
 670         if (nHeaderStart != -1)
 671             AbortMessage();
 672         nHeaderStart = vSend.size();
 673         vSend << CMessageHeader(pszCommand, 0);
 674         nMessageStart = vSend.size();
 675         if (fDebug)
 676             printf("%s ", DateTimeStrFormat("%x %H:%M:%S", GetTime()).c_str());
 677         printf("sending: %s ", pszCommand);
 678     }
 679
 680     void AbortMessage()
 681     {
 682         if (nHeaderStart == -1)
 683             return;
 684         vSend.resize(nHeaderStart);
 685         nHeaderStart = -1;
 686         nMessageStart = -1;
 687         cs_vSend.Leave();
 688         printf("(aborted)\n");
 689     }
 690
 691     void EndMessage()
 692     {
 693         if (mapArgs.count("-dropmessagestest") && GetRand(atoi(mapArgs["-dropmessagestest"])) == 0)
 694         {
 695             printf("dropmessages DROPPING SEND MESSAGE\n");
 696             AbortMessage();
 697             return;
 698         }
 699
 700         if (nHeaderStart == -1)
 701             return;
 702
 703         // Set the size
 704         unsigned int nSize = vSend.size() - nMessageStart;
 705         memcpy((char*)&vSend[nHeaderStart] + offsetof(CMessageHeader, nMessageSize), &nSize, sizeof(nSize));
 706
 707         // Set the checksum
 708         if (vSend.GetVersion() >= 209)
 709         {
 710             uint256 hash = Hash(vSend.begin() + nMessageStart, vSend.end());
 711             unsigned int nChecksum = 0;
 712             memcpy(&nChecksum, &hash, sizeof(nChecksum));
 713             assert(nMessageStart - nHeaderStart >= offsetof(CMessageHeader, nChecksum) + sizeof(nChecksum));
 714             memcpy((char*)&vSend[nHeaderStart] + offsetof(CMessageHeader, nChecksum), &nChecksum, sizeof(nChecksum));
 715         }
 716
 717         printf("(%d bytes) ", nSize);
 718         printf("\n");
 719
 720         nHeaderStart = -1;
 721         nMessageStart = -1;
 722         cs_vSend.Leave();
 723     }
 724
 725     void EndMessageAbortIfEmpty()
 726     {
 727         if (nHeaderStart == -1)
 728             return;
 729         int nSize = vSend.size() - nMessageStart;
 730         if (nSize > 0)
 731             EndMessage();
 732         else
 733             AbortMessage();
 734     }
 735
 736
 737
 738
 739     void PushMessage(const char* pszCommand)
 740     {
 741         try
 742         {
 743             BeginMessage(pszCommand);
 744             EndMessage();
 745         }
 746         catch (...)
 747         {
 748             AbortMessage();
 749             throw;
 750         }
 751     }
 752
 753     template<typename T1>
 754     void PushMessage(const char* pszCommand, const T1& a1)
 755     {
 756         try
 757         {
 758             BeginMessage(pszCommand);
 759             vSend << a1;
 760             EndMessage();
 761         }
 762         catch (...)
 763         {
 764             AbortMessage();
 765             throw;
 766         }
 767     }
 768
 769     template<typename T1, typename T2>
 770     void PushMessage(const char* pszCommand, const T1& a1, const T2& a2)
 771     {
 772         try
 773         {
 774             BeginMessage(pszCommand);
 775             vSend << a1 << a2;
 776             EndMessage();
 777         }
 778         catch (...)
 779         {
 780             AbortMessage();
 781             throw;
 782         }
 783     }
 784
 785     template<typename T1, typename T2, typename T3>
 786     void PushMessage(const char* pszCommand, const T1& a1, const T2& a2, const T3& a3)
 787     {
 788         try
 789         {
 790             BeginMessage(pszCommand);
 791             vSend << a1 << a2 << a3;
 792             EndMessage();
 793         }
 794         catch (...)
 795         {
 796             AbortMessage();
 797             throw;
 798         }
 799     }
 800
 801     template<typename T1, typename T2, typename T3, typename T4>
 802     void PushMessage(const char* pszCommand, const T1& a1, const T2& a2, const T3& a3, const T4& a4)
 803     {
 804         try
 805         {
 806             BeginMessage(pszCommand);
 807             vSend << a1 << a2 << a3 << a4;
 808             EndMessage();
 809         }
 810         catch (...)
 811         {
 812             AbortMessage();
 813             throw;
 814         }
 815     }
 816
 817     template<typename T1, typename T2, typename T3, typename T4, typename T5>
 818     void PushMessage(const char* pszCommand, const T1& a1, const T2& a2, const T3& a3, const T4& a4, const T5& a5)
 819     {
 820         try
 821         {
 822             BeginMessage(pszCommand);
 823             vSend << a1 << a2 << a3 << a4 << a5;
 824             EndMessage();
 825         }
 826         catch (...)
 827         {
 828             AbortMessage();
 829             throw;
 830         }
 831     }
 832
 833     template<typename T1, typename T2, typename T3, typename T4, typename T5, typename T6>
 834     void PushMessage(const char* pszCommand, const T1& a1, const T2& a2, const T3& a3, const T4& a4, const T5& a5, const T6& a6)
 835     {
 836         try
 837         {
 838             BeginMessage(pszCommand);
 839             vSend << a1 << a2 << a3 << a4 << a5 << a6;
 840             EndMessage();
 841         }
 842         catch (...)
 843         {
 844             AbortMessage();
 845             throw;
 846         }
 847     }
 848
 849     template<typename T1, typename T2, typename T3, typename T4, typename T5, typename T6, typename T7>
 850     void PushMessage(const char* pszCommand, const T1& a1, const T2& a2, const T3& a3, const T4& a4, const T5& a5, const T6& a6, const T7& a7)
 851     {
 852         try
 853         {
 854             BeginMessage(pszCommand);
 855             vSend << a1 << a2 << a3 << a4 << a5 << a6 << a7;
 856             EndMessage();
 857         }
 858         catch (...)
 859         {
 860             AbortMessage();
 861             throw;
 862         }
 863     }
 864
 865     template<typename T1, typename T2, typename T3, typename T4, typename T5, typename T6, typename T7, typename T8>
 866     void PushMessage(const char* pszCommand, const T1& a1, const T2& a2, const T3& a3, const T4& a4, const T5& a5, const T6& a6, const T7& a7, const T8& a8)
 867     {
 868         try
 869         {
 870             BeginMessage(pszCommand);
 871             vSend << a1 << a2 << a3 << a4 << a5 << a6 << a7 << a8;
 872             EndMessage();
 873         }
 874         catch (...)
 875         {
 876             AbortMessage();
 877             throw;
 878         }
 879     }
 880
 881     template<typename T1, typename T2, typename T3, typename T4, typename T5, typename T6, typename T7, typename T8, typename T9>
 882     void PushMessage(const char* pszCommand, const T1& a1, const T2& a2, const T3& a3, const T4& a4, const T5& a5, const T6& a6, const T7& a7, const T8& a8, const T9& a9)
 883     {
 884         try
 885         {
 886             BeginMessage(pszCommand);
 887             vSend << a1 << a2 << a3 << a4 << a5 << a6 << a7 << a8 << a9;
 888             EndMessage();
 889         }
 890         catch (...)
 891         {
 892             AbortMessage();
 893             throw;
 894         }
 895     }
 896
 897
 898     void PushRequest(const char* pszCommand,
 899                      void (*fn)(void*, CDataStream&), void* param1)
 900     {
 901         uint256 hashReply;
 902         RAND_bytes((unsigned char*)&hashReply, sizeof(hashReply));
 903
 904         CRITICAL_BLOCK(cs_mapRequests)
 905             mapRequests[hashReply] = CRequestTracker(fn, param1);
 906
 907         PushMessage(pszCommand, hashReply);
 908     }
 909
 910     template<typename T1>
 911     void PushRequest(const char* pszCommand, const T1& a1,
 912                      void (*fn)(void*, CDataStream&), void* param1)
 913     {
 914         uint256 hashReply;
 915         RAND_bytes((unsigned char*)&hashReply, sizeof(hashReply));
 916
 917         CRITICAL_BLOCK(cs_mapRequests)
 918             mapRequests[hashReply] = CRequestTracker(fn, param1);
 919
 920         PushMessage(pszCommand, hashReply, a1);
 921     }
 922
 923     template<typename T1, typename T2>
 924     void PushRequest(const char* pszCommand, const T1& a1, const T2& a2,
 925                      void (*fn)(void*, CDataStream&), void* param1)
 926     {
 927         uint256 hashReply;
 928         RAND_bytes((unsigned char*)&hashReply, sizeof(hashReply));
 929
 930         CRITICAL_BLOCK(cs_mapRequests)
 931             mapRequests[hashReply] = CRequestTracker(fn, param1);
 932
 933         PushMessage(pszCommand, hashReply, a1, a2);
 934     }
 935
 936
 937
 938     void PushGetBlocks(CBlockIndex* pindexBegin, uint256 hashEnd);
 939     bool IsSubscribed(unsigned int nChannel);
 940     void Subscribe(unsigned int nChannel, unsigned int nHops=0);
 941     void CancelSubscribe(unsigned int nChannel);
 942     void CloseSocketDisconnect();
 943     void Cleanup();
 944 };
 945
 946
 947
 948
 949
 950
 951
 952
 953
 954
 955 inline void RelayInventory(const CInv& inv)
 956 {
 957     // Put on lists to offer to the other nodes
 958     CRITICAL_BLOCK(cs_vNodes)
 959         foreach(CNode* pnode, vNodes)
 960             pnode->PushInventory(inv);
 961 }
 962
 963 template<typename T>
 964 void RelayMessage(const CInv& inv, const T& a)
 965 {
 966     CDataStream ss(SER_NETWORK);
 967     ss.reserve(10000);
 968     ss << a;
 969     RelayMessage(inv, ss);
 970 }
 971
 972 template<>
 973 inline void RelayMessage<>(const CInv& inv, const CDataStream& ss)
 974 {
 975     CRITICAL_BLOCK(cs_mapRelay)
 976     {
 977         // Expire old relay messages
 978         while (!vRelayExpiration.empty() && vRelayExpiration.front().first < GetTime())
 979         {
 980             mapRelay.erase(vRelayExpiration.front().second);
 981             vRelayExpiration.pop_front();
 982         }
 983
 984         // Save original serialized message so newer versions are preserved
 985         mapRelay[inv] = ss;
 986         vRelayExpiration.push_back(make_pair(GetTime() + 15 * 60, inv));
 987     }
 988
 989     RelayInventory(inv);
 990 }
 991
 992
 993
 994
 995
 996
 997
 998
 999 //
1000 // Templates for the publish and subscription system.
1001 // The object being published as T& obj needs to have:
1002 //   a set<unsigned int> setSources member
1003 //   specializations of AdvertInsert and AdvertErase
1004 // Currently implemented for CTable and CProduct.
1005 //
1006
1007 template<typename T>
1008 void AdvertStartPublish(CNode* pfrom, unsigned int nChannel, unsigned int nHops, T& obj)
1009 {
1010     // Add to sources
1011     obj.setSources.insert(pfrom->addr.ip);
1012
1013     if (!AdvertInsert(obj))
1014         return;
1015
1016     // Relay
1017     CRITICAL_BLOCK(cs_vNodes)
1018         foreach(CNode* pnode, vNodes)
1019             if (pnode != pfrom && (nHops < PUBLISH_HOPS || pnode->IsSubscribed(nChannel)))
1020                 pnode->PushMessage("publish", nChannel, nHops, obj);
1021 }
1022
1023 template<typename T>
1024 void AdvertStopPublish(CNode* pfrom, unsigned int nChannel, unsigned int nHops, T& obj)
1025 {
1026     uint256 hash = obj.GetHash();
1027
1028     CRITICAL_BLOCK(cs_vNodes)
1029         foreach(CNode* pnode, vNodes)
1030             if (pnode != pfrom && (nHops < PUBLISH_HOPS || pnode->IsSubscribed(nChannel)))
1031                 pnode->PushMessage("pub-cancel", nChannel, nHops, hash);
1032
1033     AdvertErase(obj);
1034 }
1035
1036 template<typename T>
1037 void AdvertRemoveSource(CNode* pfrom, unsigned int nChannel, unsigned int nHops, T& obj)
1038 {
1039     // Remove a source
1040     obj.setSources.erase(pfrom->addr.ip);
1041
1042     // If no longer supported by any sources, cancel it
1043     if (obj.setSources.empty())
1044         AdvertStopPublish(pfrom, nChannel, nHops, obj);
1045 }