856 lines
21 KiB
C++
856 lines
21 KiB
C++
// Copyright (c) 2009 Satoshi Nakamoto
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// Distributed under the MIT/X11 software license, see the accompanying
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// file license.txt or http://www.opensource.org/licenses/mit-license.php.
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class CMessageHeader;
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class CAddress;
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class CInv;
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class CRequestTracker;
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class CNode;
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static const unsigned short DEFAULT_PORT = htons(8333);
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static const unsigned int PUBLISH_HOPS = 5;
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enum
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{
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NODE_NETWORK = (1 << 0),
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};
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bool ConnectSocket(const CAddress& addrConnect, SOCKET& hSocketRet);
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bool GetMyExternalIP(unsigned int& ipRet);
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bool AddAddress(CAddrDB& addrdb, const CAddress& addr);
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CNode* FindNode(unsigned int ip);
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CNode* ConnectNode(CAddress addrConnect, int64 nTimeout=0);
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void AbandonRequests(void (*fn)(void*, CDataStream&), void* param1);
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bool AnySubscribed(unsigned int nChannel);
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void ThreadBitcoinMiner(void* parg);
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bool StartNode(string& strError=REF(string()));
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bool StopNode();
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void CheckForShutdown(int n);
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//
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// Message header
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// (4) message start
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// (12) command
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// (4) size
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// The message start string is designed to be unlikely to occur in normal data.
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// The characters are rarely used upper ascii, not valid as UTF-8, and produce
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// a large 4-byte int at any alignment.
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static const char pchMessageStart[4] = { 0xf9, 0xbe, 0xb4, 0xd9 };
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class CMessageHeader
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{
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public:
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enum { COMMAND_SIZE=12 };
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char pchMessageStart[sizeof(::pchMessageStart)];
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char pchCommand[COMMAND_SIZE];
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unsigned int nMessageSize;
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CMessageHeader()
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{
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memcpy(pchMessageStart, ::pchMessageStart, sizeof(pchMessageStart));
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memset(pchCommand, 0, sizeof(pchCommand));
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pchCommand[1] = 1;
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nMessageSize = -1;
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}
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CMessageHeader(const char* pszCommand, unsigned int nMessageSizeIn)
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{
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memcpy(pchMessageStart, ::pchMessageStart, sizeof(pchMessageStart));
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strncpy(pchCommand, pszCommand, COMMAND_SIZE);
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nMessageSize = nMessageSizeIn;
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}
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IMPLEMENT_SERIALIZE
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(
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READWRITE(FLATDATA(pchMessageStart));
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READWRITE(FLATDATA(pchCommand));
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READWRITE(nMessageSize);
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)
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string GetCommand()
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{
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if (pchCommand[COMMAND_SIZE-1] == 0)
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return string(pchCommand, pchCommand + strlen(pchCommand));
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else
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return string(pchCommand, pchCommand + COMMAND_SIZE);
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}
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bool IsValid()
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{
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// Check start string
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if (memcmp(pchMessageStart, ::pchMessageStart, sizeof(pchMessageStart)) != 0)
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return false;
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// Check the command string for errors
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for (char* p1 = pchCommand; p1 < pchCommand + COMMAND_SIZE; p1++)
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{
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if (*p1 == 0)
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{
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// Must be all zeros after the first zero
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for (; p1 < pchCommand + COMMAND_SIZE; p1++)
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if (*p1 != 0)
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return false;
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}
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else if (*p1 < ' ' || *p1 > 0x7E)
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return false;
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}
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// Message size
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if (nMessageSize > 0x10000000)
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{
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printf("CMessageHeader::IsValid() : nMessageSize too large %u\n", nMessageSize);
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return false;
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}
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return true;
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}
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};
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static const unsigned char pchIPv4[12] = { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0xff, 0xff };
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class CAddress
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{
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public:
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uint64 nServices;
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unsigned char pchReserved[12];
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unsigned int ip;
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unsigned short port;
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// disk only
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unsigned int nTime;
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// memory only
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unsigned int nLastFailed;
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CAddress()
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{
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nServices = 0;
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memcpy(pchReserved, pchIPv4, sizeof(pchReserved));
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ip = 0;
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port = DEFAULT_PORT;
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nTime = GetAdjustedTime();
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nLastFailed = 0;
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}
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CAddress(unsigned int ipIn, unsigned short portIn=DEFAULT_PORT, uint64 nServicesIn=0)
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{
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nServices = nServicesIn;
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memcpy(pchReserved, pchIPv4, sizeof(pchReserved));
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ip = ipIn;
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port = portIn;
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nTime = GetAdjustedTime();
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nLastFailed = 0;
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}
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explicit CAddress(const struct sockaddr_in& sockaddr, uint64 nServicesIn=0)
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{
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nServices = nServicesIn;
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memcpy(pchReserved, pchIPv4, sizeof(pchReserved));
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ip = sockaddr.sin_addr.s_addr;
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port = sockaddr.sin_port;
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nTime = GetAdjustedTime();
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nLastFailed = 0;
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}
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explicit CAddress(const char* pszIn, uint64 nServicesIn=0)
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{
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nServices = nServicesIn;
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memcpy(pchReserved, pchIPv4, sizeof(pchReserved));
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ip = 0;
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port = DEFAULT_PORT;
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nTime = GetAdjustedTime();
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nLastFailed = 0;
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char psz[100];
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if (strlen(pszIn) > ARRAYLEN(psz)-1)
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return;
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strcpy(psz, pszIn);
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unsigned int a, b, c, d, e;
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if (sscanf(psz, "%u.%u.%u.%u:%u", &a, &b, &c, &d, &e) < 4)
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return;
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char* pszPort = strchr(psz, ':');
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if (pszPort)
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{
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*pszPort++ = '\0';
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port = htons(atoi(pszPort));
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}
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ip = inet_addr(psz);
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}
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IMPLEMENT_SERIALIZE
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(
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if (nType & SER_DISK)
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{
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READWRITE(nVersion);
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READWRITE(nTime);
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}
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READWRITE(nServices);
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READWRITE(FLATDATA(pchReserved));
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READWRITE(ip);
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READWRITE(port);
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)
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friend inline bool operator==(const CAddress& a, const CAddress& b)
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{
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return (memcmp(a.pchReserved, b.pchReserved, sizeof(a.pchReserved)) == 0 &&
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a.ip == b.ip &&
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a.port == b.port);
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}
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friend inline bool operator<(const CAddress& a, const CAddress& b)
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{
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int ret = memcmp(a.pchReserved, b.pchReserved, sizeof(a.pchReserved));
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if (ret < 0)
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return true;
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else if (ret == 0)
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{
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if (ntohl(a.ip) < ntohl(b.ip))
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return true;
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else if (a.ip == b.ip)
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return ntohs(a.port) < ntohs(b.port);
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}
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return false;
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}
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vector<unsigned char> GetKey() const
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{
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CDataStream ss;
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ss.reserve(18);
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ss << FLATDATA(pchReserved) << ip << port;
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#if defined(_MSC_VER) && _MSC_VER < 1300
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return vector<unsigned char>((unsigned char*)&ss.begin()[0], (unsigned char*)&ss.end()[0]);
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#else
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return vector<unsigned char>(ss.begin(), ss.end());
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#endif
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}
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struct sockaddr_in GetSockAddr() const
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{
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struct sockaddr_in sockaddr;
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sockaddr.sin_family = AF_INET;
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sockaddr.sin_addr.s_addr = ip;
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sockaddr.sin_port = port;
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return sockaddr;
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}
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bool IsIPv4() const
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{
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return (memcmp(pchReserved, pchIPv4, sizeof(pchIPv4)) == 0);
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}
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bool IsRoutable() const
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{
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return !(GetByte(3) == 10 || (GetByte(3) == 192 && GetByte(2) == 168) || GetByte(3) == 127 || GetByte(3) == 0);
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}
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unsigned char GetByte(int n) const
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{
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return ((unsigned char*)&ip)[3-n];
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}
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string ToStringIPPort() const
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{
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return strprintf("%u.%u.%u.%u:%u", GetByte(3), GetByte(2), GetByte(1), GetByte(0), ntohs(port));
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}
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string ToStringIP() const
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{
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return strprintf("%u.%u.%u.%u", GetByte(3), GetByte(2), GetByte(1), GetByte(0));
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}
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string ToString() const
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{
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return strprintf("%u.%u.%u.%u:%u", GetByte(3), GetByte(2), GetByte(1), GetByte(0), ntohs(port));
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//return strprintf("%u.%u.%u.%u", GetByte(3), GetByte(2), GetByte(1), GetByte(0));
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}
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void print() const
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{
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printf("CAddress(%s)\n", ToString().c_str());
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}
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};
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enum
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{
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MSG_TX = 1,
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MSG_BLOCK,
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MSG_REVIEW,
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MSG_PRODUCT,
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MSG_TABLE,
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};
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static const char* ppszTypeName[] =
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{
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"ERROR",
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"tx",
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"block",
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"review",
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"product",
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"table",
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};
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class CInv
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{
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public:
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int type;
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uint256 hash;
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CInv()
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{
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type = 0;
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hash = 0;
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}
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CInv(int typeIn, const uint256& hashIn)
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{
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type = typeIn;
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hash = hashIn;
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}
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CInv(const string& strType, const uint256& hashIn)
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{
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int i;
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for (i = 1; i < ARRAYLEN(ppszTypeName); i++)
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{
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if (strType == ppszTypeName[i])
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{
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type = i;
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break;
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}
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}
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if (i == ARRAYLEN(ppszTypeName))
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throw std::out_of_range(strprintf("CInv::CInv(string, uint256) : unknown type '%s'", strType.c_str()));
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hash = hashIn;
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}
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IMPLEMENT_SERIALIZE
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(
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READWRITE(type);
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READWRITE(hash);
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)
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friend inline bool operator<(const CInv& a, const CInv& b)
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{
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return (a.type < b.type || (a.type == b.type && a.hash < b.hash));
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}
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bool IsKnownType() const
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{
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return (type >= 1 && type < ARRAYLEN(ppszTypeName));
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}
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const char* GetCommand() const
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{
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if (!IsKnownType())
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throw std::out_of_range(strprintf("CInv::GetCommand() : type=% unknown type", type));
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return ppszTypeName[type];
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}
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string ToString() const
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{
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return strprintf("%s %s", GetCommand(), hash.ToString().substr(0,14).c_str());
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}
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void print() const
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{
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printf("CInv(%s)\n", ToString().c_str());
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}
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};
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class CRequestTracker
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{
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public:
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void (*fn)(void*, CDataStream&);
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void* param1;
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explicit CRequestTracker(void (*fnIn)(void*, CDataStream&)=NULL, void* param1In=NULL)
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{
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fn = fnIn;
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param1 = param1In;
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}
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bool IsNull()
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{
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return fn == NULL;
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}
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};
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extern bool fClient;
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extern uint64 nLocalServices;
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extern CAddress addrLocalHost;
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extern CNode* pnodeLocalHost;
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extern bool fShutdown;
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extern array<bool, 10> vfThreadRunning;
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extern vector<CNode*> vNodes;
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extern CCriticalSection cs_vNodes;
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extern map<vector<unsigned char>, CAddress> mapAddresses;
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extern CCriticalSection cs_mapAddresses;
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extern map<CInv, CDataStream> mapRelay;
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extern deque<pair<int64, CInv> > vRelayExpiration;
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extern CCriticalSection cs_mapRelay;
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extern map<CInv, int64> mapAlreadyAskedFor;
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extern CAddress addrProxy;
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class CNode
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{
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public:
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// socket
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uint64 nServices;
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SOCKET hSocket;
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CDataStream vSend;
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CDataStream vRecv;
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CCriticalSection cs_vSend;
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CCriticalSection cs_vRecv;
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unsigned int nPushPos;
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CAddress addr;
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int nVersion;
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bool fClient;
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bool fInbound;
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bool fNetworkNode;
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bool fDisconnect;
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protected:
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int nRefCount;
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public:
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int64 nReleaseTime;
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map<uint256, CRequestTracker> mapRequests;
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CCriticalSection cs_mapRequests;
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// flood
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vector<CAddress> vAddrToSend;
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set<CAddress> setAddrKnown;
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// inventory based relay
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set<CInv> setInventoryKnown;
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set<CInv> setInventoryKnown2;
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vector<CInv> vInventoryToSend;
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CCriticalSection cs_inventory;
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multimap<int64, CInv> mapAskFor;
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// publish and subscription
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vector<char> vfSubscribe;
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CNode(SOCKET hSocketIn, CAddress addrIn, bool fInboundIn=false)
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{
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nServices = 0;
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hSocket = hSocketIn;
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vSend.SetType(SER_NETWORK);
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vRecv.SetType(SER_NETWORK);
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nPushPos = -1;
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addr = addrIn;
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nVersion = 0;
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fClient = false; // set by version message
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fInbound = fInboundIn;
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fNetworkNode = false;
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fDisconnect = false;
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nRefCount = 0;
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nReleaseTime = 0;
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vfSubscribe.assign(256, false);
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// Push a version message
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/// when NTP implemented, change to just nTime = GetAdjustedTime()
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int64 nTime = (fInbound ? GetAdjustedTime() : GetTime());
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PushMessage("version", VERSION, nLocalServices, nTime, addr);
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}
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~CNode()
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{
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if (hSocket != INVALID_SOCKET)
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closesocket(hSocket);
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}
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private:
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CNode(const CNode&);
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void operator=(const CNode&);
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public:
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bool ReadyToDisconnect()
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{
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return fDisconnect || GetRefCount() <= 0;
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}
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int GetRefCount()
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{
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return max(nRefCount, 0) + (GetTime() < nReleaseTime ? 1 : 0);
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}
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void AddRef(int64 nTimeout=0)
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{
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if (nTimeout != 0)
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nReleaseTime = max(nReleaseTime, GetTime() + nTimeout);
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else
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nRefCount++;
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}
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void Release()
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{
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nRefCount--;
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}
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void AddInventoryKnown(const CInv& inv)
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{
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CRITICAL_BLOCK(cs_inventory)
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setInventoryKnown.insert(inv);
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}
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void PushInventory(const CInv& inv)
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{
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CRITICAL_BLOCK(cs_inventory)
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if (!setInventoryKnown.count(inv))
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vInventoryToSend.push_back(inv);
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}
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void AskFor(const CInv& inv)
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{
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// We're using mapAskFor as a priority queue,
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// the key is the earliest time the request can be sent
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int64& nRequestTime = mapAlreadyAskedFor[inv];
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printf("askfor %s %I64d\n", inv.ToString().c_str(), nRequestTime);
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// Make sure not to reuse time indexes to keep things in the same order
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int64 nNow = (GetTime() - 1) * 1000000;
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static int64 nLastTime;
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nLastTime = nNow = max(nNow, ++nLastTime);
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// Each retry is 2 minutes after the last
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nRequestTime = max(nRequestTime + 2 * 60 * 1000000, nNow);
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mapAskFor.insert(make_pair(nRequestTime, inv));
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}
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void BeginMessage(const char* pszCommand)
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{
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EnterCriticalSection(&cs_vSend);
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if (nPushPos != -1)
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AbortMessage();
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nPushPos = vSend.size();
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vSend << CMessageHeader(pszCommand, 0);
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printf("sending: %-12s ", pszCommand);
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}
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void AbortMessage()
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{
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if (nPushPos == -1)
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return;
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vSend.resize(nPushPos);
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nPushPos = -1;
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LeaveCriticalSection(&cs_vSend);
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printf("(aborted)\n");
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}
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void EndMessage()
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{
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extern int nDropMessagesTest;
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if (nDropMessagesTest > 0 && GetRand(nDropMessagesTest) == 0)
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{
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printf("dropmessages DROPPING SEND MESSAGE\n");
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AbortMessage();
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return;
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}
|
|
|
|
if (nPushPos == -1)
|
|
return;
|
|
|
|
// Patch in the size
|
|
unsigned int nSize = vSend.size() - nPushPos - sizeof(CMessageHeader);
|
|
memcpy((char*)&vSend[nPushPos] + offsetof(CMessageHeader, nMessageSize), &nSize, sizeof(nSize));
|
|
|
|
printf("(%d bytes) ", nSize);
|
|
//for (int i = nPushPos+sizeof(CMessageHeader); i < min(vSend.size(), nPushPos+sizeof(CMessageHeader)+20U); i++)
|
|
// printf("%02x ", vSend[i] & 0xff);
|
|
printf("\n");
|
|
|
|
nPushPos = -1;
|
|
LeaveCriticalSection(&cs_vSend);
|
|
}
|
|
|
|
void EndMessageAbortIfEmpty()
|
|
{
|
|
if (nPushPos == -1)
|
|
return;
|
|
int nSize = vSend.size() - nPushPos - sizeof(CMessageHeader);
|
|
if (nSize > 0)
|
|
EndMessage();
|
|
else
|
|
AbortMessage();
|
|
}
|
|
|
|
const char* GetMessageCommand() const
|
|
{
|
|
if (nPushPos == -1)
|
|
return "";
|
|
return &vSend[nPushPos] + offsetof(CMessageHeader, pchCommand);
|
|
}
|
|
|
|
|
|
|
|
|
|
void PushMessage(const char* pszCommand)
|
|
{
|
|
try
|
|
{
|
|
BeginMessage(pszCommand);
|
|
EndMessage();
|
|
}
|
|
catch (...)
|
|
{
|
|
AbortMessage();
|
|
throw;
|
|
}
|
|
}
|
|
|
|
template<typename T1>
|
|
void PushMessage(const char* pszCommand, const T1& a1)
|
|
{
|
|
try
|
|
{
|
|
BeginMessage(pszCommand);
|
|
vSend << a1;
|
|
EndMessage();
|
|
}
|
|
catch (...)
|
|
{
|
|
AbortMessage();
|
|
throw;
|
|
}
|
|
}
|
|
|
|
template<typename T1, typename T2>
|
|
void PushMessage(const char* pszCommand, const T1& a1, const T2& a2)
|
|
{
|
|
try
|
|
{
|
|
BeginMessage(pszCommand);
|
|
vSend << a1 << a2;
|
|
EndMessage();
|
|
}
|
|
catch (...)
|
|
{
|
|
AbortMessage();
|
|
throw;
|
|
}
|
|
}
|
|
|
|
template<typename T1, typename T2, typename T3>
|
|
void PushMessage(const char* pszCommand, const T1& a1, const T2& a2, const T3& a3)
|
|
{
|
|
try
|
|
{
|
|
BeginMessage(pszCommand);
|
|
vSend << a1 << a2 << a3;
|
|
EndMessage();
|
|
}
|
|
catch (...)
|
|
{
|
|
AbortMessage();
|
|
throw;
|
|
}
|
|
}
|
|
|
|
template<typename T1, typename T2, typename T3, typename T4>
|
|
void PushMessage(const char* pszCommand, const T1& a1, const T2& a2, const T3& a3, const T4& a4)
|
|
{
|
|
try
|
|
{
|
|
BeginMessage(pszCommand);
|
|
vSend << a1 << a2 << a3 << a4;
|
|
EndMessage();
|
|
}
|
|
catch (...)
|
|
{
|
|
AbortMessage();
|
|
throw;
|
|
}
|
|
}
|
|
|
|
|
|
void PushRequest(const char* pszCommand,
|
|
void (*fn)(void*, CDataStream&), void* param1)
|
|
{
|
|
uint256 hashReply;
|
|
RAND_bytes((unsigned char*)&hashReply, sizeof(hashReply));
|
|
|
|
CRITICAL_BLOCK(cs_mapRequests)
|
|
mapRequests[hashReply] = CRequestTracker(fn, param1);
|
|
|
|
PushMessage(pszCommand, hashReply);
|
|
}
|
|
|
|
template<typename T1>
|
|
void PushRequest(const char* pszCommand, const T1& a1,
|
|
void (*fn)(void*, CDataStream&), void* param1)
|
|
{
|
|
uint256 hashReply;
|
|
RAND_bytes((unsigned char*)&hashReply, sizeof(hashReply));
|
|
|
|
CRITICAL_BLOCK(cs_mapRequests)
|
|
mapRequests[hashReply] = CRequestTracker(fn, param1);
|
|
|
|
PushMessage(pszCommand, hashReply, a1);
|
|
}
|
|
|
|
template<typename T1, typename T2>
|
|
void PushRequest(const char* pszCommand, const T1& a1, const T2& a2,
|
|
void (*fn)(void*, CDataStream&), void* param1)
|
|
{
|
|
uint256 hashReply;
|
|
RAND_bytes((unsigned char*)&hashReply, sizeof(hashReply));
|
|
|
|
CRITICAL_BLOCK(cs_mapRequests)
|
|
mapRequests[hashReply] = CRequestTracker(fn, param1);
|
|
|
|
PushMessage(pszCommand, hashReply, a1, a2);
|
|
}
|
|
|
|
|
|
|
|
bool IsSubscribed(unsigned int nChannel);
|
|
void Subscribe(unsigned int nChannel, unsigned int nHops=0);
|
|
void CancelSubscribe(unsigned int nChannel);
|
|
void Disconnect();
|
|
};
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
inline void RelayInventory(const CInv& inv)
|
|
{
|
|
// Put on lists to offer to the other nodes
|
|
CRITICAL_BLOCK(cs_vNodes)
|
|
foreach(CNode* pnode, vNodes)
|
|
pnode->PushInventory(inv);
|
|
}
|
|
|
|
template<typename T>
|
|
void RelayMessage(const CInv& inv, const T& a)
|
|
{
|
|
CDataStream ss(SER_NETWORK);
|
|
ss.reserve(10000);
|
|
ss << a;
|
|
RelayMessage(inv, ss);
|
|
}
|
|
|
|
template<>
|
|
inline void RelayMessage<>(const CInv& inv, const CDataStream& ss)
|
|
{
|
|
CRITICAL_BLOCK(cs_mapRelay)
|
|
{
|
|
// Expire old relay messages
|
|
while (!vRelayExpiration.empty() && vRelayExpiration.front().first < GetTime())
|
|
{
|
|
mapRelay.erase(vRelayExpiration.front().second);
|
|
vRelayExpiration.pop_front();
|
|
}
|
|
|
|
// Save original serialized message so newer versions are preserved
|
|
mapRelay[inv] = ss;
|
|
vRelayExpiration.push_back(make_pair(GetTime() + 15 * 60, inv));
|
|
}
|
|
|
|
RelayInventory(inv);
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
//
|
|
// Templates for the publish and subscription system.
|
|
// The object being published as T& obj needs to have:
|
|
// a set<unsigned int> setSources member
|
|
// specializations of AdvertInsert and AdvertErase
|
|
// Currently implemented for CTable and CProduct.
|
|
//
|
|
|
|
template<typename T>
|
|
void AdvertStartPublish(CNode* pfrom, unsigned int nChannel, unsigned int nHops, T& obj)
|
|
{
|
|
// Add to sources
|
|
obj.setSources.insert(pfrom->addr.ip);
|
|
|
|
if (!AdvertInsert(obj))
|
|
return;
|
|
|
|
// Relay
|
|
CRITICAL_BLOCK(cs_vNodes)
|
|
foreach(CNode* pnode, vNodes)
|
|
if (pnode != pfrom && (nHops < PUBLISH_HOPS || pnode->IsSubscribed(nChannel)))
|
|
pnode->PushMessage("publish", nChannel, nHops, obj);
|
|
}
|
|
|
|
template<typename T>
|
|
void AdvertStopPublish(CNode* pfrom, unsigned int nChannel, unsigned int nHops, T& obj)
|
|
{
|
|
uint256 hash = obj.GetHash();
|
|
|
|
CRITICAL_BLOCK(cs_vNodes)
|
|
foreach(CNode* pnode, vNodes)
|
|
if (pnode != pfrom && (nHops < PUBLISH_HOPS || pnode->IsSubscribed(nChannel)))
|
|
pnode->PushMessage("pub-cancel", nChannel, nHops, hash);
|
|
|
|
AdvertErase(obj);
|
|
}
|
|
|
|
template<typename T>
|
|
void AdvertRemoveSource(CNode* pfrom, unsigned int nChannel, unsigned int nHops, T& obj)
|
|
{
|
|
// Remove a source
|
|
obj.setSources.erase(pfrom->addr.ip);
|
|
|
|
// If no longer supported by any sources, cancel it
|
|
if (obj.setSources.empty())
|
|
AdvertStopPublish(pfrom, nChannel, nHops, obj);
|
|
}
|