src/checkpoints.h

   1 // Copyright (c) 2009-2012 The Bitcoin developers
   2 // Distributed under the MIT/X11 software license, see the accompanying
   3 // file COPYING or http://www.opensource.org/licenses/mit-license.php.
   4 #ifndef BITCOIN_CHECKPOINT_H
   5 #define  BITCOIN_CHECKPOINT_H
   6
   7 #include <map>
   8 #include "net.h"
   9 #include "util.h"
  10
  11 #define CHECKPOINT_MAX_SPAN (60 * 60 * 4) // max 4 hours before latest block
  12
  13 class uint256;
  14 class CBlockIndex;
  15 class CSyncCheckpoint;
  16
  17 /** Block-chain checkpoints are compiled-in sanity checks.
  18  * They are updated every release or three.
  19  */
  20 namespace Checkpoints
  21 {
  22     // Returns true if block passes checkpoint checks
  23     bool CheckHardened(int nHeight, const uint256& hash);
  24
  25     // Return conservative estimate of total number of blocks, 0 if unknown
  26     int GetTotalBlocksEstimate();
  27
  28     // Returns last CBlockIndex* in mapBlockIndex that is a checkpoint
  29     CBlockIndex* GetLastCheckpoint(const std::map<uint256, CBlockIndex*>& mapBlockIndex);
  30
  31     // Returns last checkpoint timestamp
  32     int GetLastCheckpointTime();
  33
  34     extern uint256 hashSyncCheckpoint;
  35     extern CSyncCheckpoint checkpointMessage;
  36     extern uint256 hashInvalidCheckpoint;
  37     extern CCriticalSection cs_hashSyncCheckpoint;
  38
  39     CBlockIndex* GetLastSyncCheckpoint();
  40     bool WriteSyncCheckpoint(const uint256& hashCheckpoint);
  41     bool AcceptPendingSyncCheckpoint();
  42     uint256 AutoSelectSyncCheckpoint();
  43     bool CheckSync(const uint256& hashBlock, const CBlockIndex* pindexPrev);
  44     bool WantedByPendingSyncCheckpoint(uint256 hashBlock);
  45     bool ResetSyncCheckpoint();
  46     void AskForPendingSyncCheckpoint(CNode* pfrom);
  47     bool SetCheckpointPrivKey(std::string strPrivKey);
  48     bool SendSyncCheckpoint(uint256 hashCheckpoint);
  49     bool IsMatureSyncCheckpoint();
  50     bool IsSyncCheckpointTooOld(unsigned int nSeconds);
  51 }
  52
  53 // ppcoin: synchronized checkpoint
  54 class CUnsignedSyncCheckpoint
  55 {
  56 public:
  57     int nVersion;
  58     uint256 hashCheckpoint;      // checkpoint block
  59
  60     IMPLEMENT_SERIALIZE
  61     (
  62         READWRITE(this->nVersion);
  63         nVersion = this->nVersion;
  64         READWRITE(hashCheckpoint);
  65     )
  66
  67     void SetNull()
  68     {
  69         nVersion = 1;
  70         hashCheckpoint = 0;
  71     }
  72
  73     std::string ToString() const
  74     {
  75         return strprintf(
  76                 "CSyncCheckpoint(\n"
  77                 "    nVersion       = %d\n"
  78                 "    hashCheckpoint = %s\n"
  79                 ")\n",
  80             nVersion,
  81             hashCheckpoint.ToString().c_str());
  82     }
  83
  84     void print() const
  85     {
  86         printf("%s", ToString().c_str());
  87     }
  88 };
  89
  90 class CSyncCheckpoint : public CUnsignedSyncCheckpoint
  91 {
  92 public:
  93     static const std::string strMasterPubKey;
  94     static std::string strMasterPrivKey;
  95
  96     std::vector<unsigned char> vchMsg;
  97     std::vector<unsigned char> vchSig;
  98
  99     CSyncCheckpoint()
 100     {
 101         SetNull();
 102     }
 103
 104     IMPLEMENT_SERIALIZE
 105     (
 106         READWRITE(vchMsg);
 107         READWRITE(vchSig);
 108     )
 109
 110     void SetNull()
 111     {
 112         CUnsignedSyncCheckpoint::SetNull();
 113         vchMsg.clear();
 114         vchSig.clear();
 115     }
 116
 117     bool IsNull() const
 118     {
 119         return (hashCheckpoint == 0);
 120     }
 121
 122     uint256 GetHash() const
 123     {
 124         return SerializeHash(*this);
 125     }
 126
 127     bool RelayTo(CNode* pnode) const
 128     {
 129         // returns true if wasn't already sent
 130         if (pnode->hashCheckpointKnown != hashCheckpoint)
 131         {
 132             pnode->hashCheckpointKnown = hashCheckpoint;
 133             pnode->PushMessage("checkpoint", *this);
 134             return true;
 135         }
 136         return false;
 137     }
 138
 139     bool CheckSignature();
 140     bool ProcessSyncCheckpoint(CNode* pfrom);
 141 };
 142
 143 #endif