src/checkpoints.h

   1 // Copyright (c) 2009-2012 The Bitcoin developers
   2 // Copyright (c) 2011-2013 The PPCoin developers
   3 // Distributed under the MIT/X11 software license, see the accompanying
   4 // file COPYING or http://www.opensource.org/licenses/mit-license.php.
   5 #ifndef BITCOIN_CHECKPOINT_H
   6 #define  BITCOIN_CHECKPOINT_H
   7
   8 #include <map>
   9 #include "net.h"
  10 #include "util.h"
  11
  12 #define CHECKPOINT_MAX_SPAN (60 * 60 * 4) // max 4 hours before latest block
  13
  14 class uint256;
  15 class CBlockIndex;
  16 class CSyncCheckpoint;
  17
  18 /** Block-chain checkpoints are compiled-in sanity checks.
  19  * They are updated every release or three.
  20  */
  21 namespace Checkpoints
  22 {
  23     // Returns true if block passes checkpoint checks
  24     bool CheckHardened(int nHeight, const uint256& hash);
  25
  26     // Return conservative estimate of total number of blocks, 0 if unknown
  27     int GetTotalBlocksEstimate();
  28
  29     // Returns last CBlockIndex* in mapBlockIndex that is a checkpoint
  30     CBlockIndex* GetLastCheckpoint(const std::map<uint256, CBlockIndex*>& mapBlockIndex);
  31
  32     extern uint256 hashSyncCheckpoint;
  33     extern CSyncCheckpoint checkpointMessage;
  34     extern uint256 hashInvalidCheckpoint;
  35     extern CCriticalSection cs_hashSyncCheckpoint;
  36
  37     CBlockIndex* GetLastSyncCheckpoint();
  38     bool WriteSyncCheckpoint(const uint256& hashCheckpoint);
  39     bool AcceptPendingSyncCheckpoint();
  40     uint256 AutoSelectSyncCheckpoint();
  41     bool CheckSync(const uint256& hashBlock, const CBlockIndex* pindexPrev);
  42     bool WantedByPendingSyncCheckpoint(uint256 hashBlock);
  43     bool ResetSyncCheckpoint();
  44     void AskForPendingSyncCheckpoint(CNode* pfrom);
  45     bool SetCheckpointPrivKey(std::string strPrivKey);
  46     bool SendSyncCheckpoint(uint256 hashCheckpoint);
  47     bool IsMatureSyncCheckpoint();
  48     bool IsSyncCheckpointTooOld(unsigned int nSeconds);
  49 }
  50
  51 // ppcoin: synchronized checkpoint
  52 class CUnsignedSyncCheckpoint
  53 {
  54 public:
  55     int nVersion;
  56     uint256 hashCheckpoint;      // checkpoint block
  57
  58     IMPLEMENT_SERIALIZE
  59     (
  60         READWRITE(this->nVersion);
  61         nVersion = this->nVersion;
  62         READWRITE(hashCheckpoint);
  63     )
  64
  65     void SetNull()
  66     {
  67         nVersion = 1;
  68         hashCheckpoint = 0;
  69     }
  70
  71     std::string ToString() const
  72     {
  73         return strprintf(
  74                 "CSyncCheckpoint(\n"
  75                 "    nVersion       = %d\n"
  76                 "    hashCheckpoint = %s\n"
  77                 ")\n",
  78             nVersion,
  79             hashCheckpoint.ToString().c_str());
  80     }
  81
  82     void print() const
  83     {
  84         printf("%s", ToString().c_str());
  85     }
  86 };
  87
  88 class CSyncCheckpoint : public CUnsignedSyncCheckpoint
  89 {
  90 public:
  91     static const std::string strMasterPubKey;
  92     static std::string strMasterPrivKey;
  93
  94     std::vector<unsigned char> vchMsg;
  95     std::vector<unsigned char> vchSig;
  96
  97     CSyncCheckpoint()
  98     {
  99         SetNull();
 100     }
 101
 102     IMPLEMENT_SERIALIZE
 103     (
 104         READWRITE(vchMsg);
 105         READWRITE(vchSig);
 106     )
 107
 108     void SetNull()
 109     {
 110         CUnsignedSyncCheckpoint::SetNull();
 111         vchMsg.clear();
 112         vchSig.clear();
 113     }
 114
 115     bool IsNull() const
 116     {
 117         return (hashCheckpoint == 0);
 118     }
 119
 120     uint256 GetHash() const
 121     {
 122         return SerializeHash(*this);
 123     }
 124
 125     bool RelayTo(CNode* pnode) const
 126     {
 127         // returns true if wasn't already sent
 128         if (pnode->hashCheckpointKnown != hashCheckpoint)
 129         {
 130             pnode->hashCheckpointKnown = hashCheckpoint;
 131             pnode->PushMessage("checkpoint", *this);
 132             return true;
 133         }
 134         return false;
 135     }
 136
 137     bool CheckSignature();
 138     bool ProcessSyncCheckpoint(CNode* pfrom);
 139 };
 140
 141 #endif