src/protocol.cpp

   1 // Copyright (c) 2009-2010 Satoshi Nakamoto
   2 // Copyright (c) 2009-2014 The Bitcoin Core developers
   3 // Distributed under the MIT software license, see the accompanying
   4 // file COPYING or http://www.opensource.org/licenses/mit-license.php.
   5
   6 #include "protocol.h"
   7
   8 #include "util.h"
   9 #include "utilstrencodings.h"
  10
  11 #ifndef WIN32
  12 # include <arpa/inet.h>
  13 #endif
  14
  15 static const char* ppszTypeName[] =
  16 {
  17     "ERROR",
  18     "tx",
  19     "block",
  20     "filtered block"
  21 };
  22
  23 CMessageHeader::CMessageHeader(const MessageStartChars& pchMessageStartIn)
  24 {
  25     memcpy(pchMessageStart, pchMessageStartIn, MESSAGE_START_SIZE);
  26     memset(pchCommand, 0, sizeof(pchCommand));
  27     nMessageSize = -1;
  28     nChecksum = 0;
  29 }
  30
  31 CMessageHeader::CMessageHeader(const MessageStartChars& pchMessageStartIn, const char* pszCommand, unsigned int nMessageSizeIn)
  32 {
  33     memcpy(pchMessageStart, pchMessageStartIn, MESSAGE_START_SIZE);
  34     memset(pchCommand, 0, sizeof(pchCommand));
  35     strncpy(pchCommand, pszCommand, COMMAND_SIZE);
  36     nMessageSize = nMessageSizeIn;
  37     nChecksum = 0;
  38 }
  39
  40 std::string CMessageHeader::GetCommand() const
  41 {
  42     return std::string(pchCommand, pchCommand + strnlen(pchCommand, COMMAND_SIZE));
  43 }
  44
  45 bool CMessageHeader::IsValid(const MessageStartChars& pchMessageStartIn) const
  46 {
  47     // Check start string
  48     if (memcmp(pchMessageStart, pchMessageStartIn, MESSAGE_START_SIZE) != 0)
  49         return false;
  50
  51     // Check the command string for errors
  52     for (const char* p1 = pchCommand; p1 < pchCommand + COMMAND_SIZE; p1++)
  53     {
  54         if (*p1 == 0)
  55         {
  56             // Must be all zeros after the first zero
  57             for (; p1 < pchCommand + COMMAND_SIZE; p1++)
  58                 if (*p1 != 0)
  59                     return false;
  60         }
  61         else if (*p1 < ' ' || *p1 > 0x7E)
  62             return false;
  63     }
  64
  65     // Message size
  66     if (nMessageSize > MAX_SIZE)
  67     {
  68         LogPrintf("CMessageHeader::IsValid(): (%s, %u bytes) nMessageSize > MAX_SIZE\n", GetCommand(), nMessageSize);
  69         return false;
  70     }
  71
  72     return true;
  73 }
  74
  75
  76
  77 CAddress::CAddress() : CService()
  78 {
  79     Init();
  80 }
  81
  82 CAddress::CAddress(CService ipIn, uint64_t nServicesIn) : CService(ipIn)
  83 {
  84     Init();
  85     nServices = nServicesIn;
  86 }
  87
  88 void CAddress::Init()
  89 {
  90     nServices = NODE_NETWORK;
  91     nTime = 100000000;
  92 }
  93
  94 CInv::CInv()
  95 {
  96     type = 0;
  97     hash.SetNull();
  98 }
  99
 100 CInv::CInv(int typeIn, const uint256& hashIn)
 101 {
 102     type = typeIn;
 103     hash = hashIn;
 104 }
 105
 106 CInv::CInv(const std::string& strType, const uint256& hashIn)
 107 {
 108     unsigned int i;
 109     for (i = 1; i < ARRAYLEN(ppszTypeName); i++)
 110     {
 111         if (strType == ppszTypeName[i])
 112         {
 113             type = i;
 114             break;
 115         }
 116     }
 117     if (i == ARRAYLEN(ppszTypeName))
 118         throw std::out_of_range(strprintf("CInv::CInv(string, uint256): unknown type '%s'", strType));
 119     hash = hashIn;
 120 }
 121
 122 bool operator<(const CInv& a, const CInv& b)
 123 {
 124     return (a.type < b.type || (a.type == b.type && a.hash < b.hash));
 125 }
 126
 127 bool CInv::IsKnownType() const
 128 {
 129     return (type >= 1 && type < (int)ARRAYLEN(ppszTypeName));
 130 }
 131
 132 const char* CInv::GetCommand() const
 133 {
 134     if (!IsKnownType())
 135         throw std::out_of_range(strprintf("CInv::GetCommand(): type=%d unknown type", type));
 136     return ppszTypeName[type];
 137 }
 138
 139 std::string CInv::ToString() const
 140 {
 141     return strprintf("%s %s", GetCommand(), hash.ToString());
 142 }