src/checkpoints.h

   1 // Copyright (c) 2009-2012 The Bitcoin developers
   2 // Copyright (c) 2011-2012 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 STAKE_MIN_AGE (60 * 60 * 24)      // minimum age for coin age
  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     bool CheckSync(const uint256& hashBlock, const CBlockIndex* pindexPrev);
  41     bool WantedByPendingSyncCheckpoint(uint256 hashBlock);
  42     bool ResetSyncCheckpoint();
  43     void AskForPendingSyncCheckpoint(CNode* pfrom);
  44     bool SendSyncCheckpoint(uint256 hashCheckpoint);
  45 }
  46
  47 // ppcoin: synchronized checkpoint
  48 class CUnsignedSyncCheckpoint
  49 {
  50 public:
  51     int nVersion;
  52     uint256 hashCheckpoint;      // checkpoint block
  53
  54     IMPLEMENT_SERIALIZE
  55     (
  56         READWRITE(this->nVersion);
  57         nVersion = this->nVersion;
  58         READWRITE(hashCheckpoint);
  59     )
  60
  61     void SetNull()
  62     {
  63         nVersion = 1;
  64         hashCheckpoint = 0;
  65     }
  66
  67     std::string ToString() const
  68     {
  69         return strprintf(
  70                 "CSyncCheckpoint(\n"
  71                 "    nVersion       = %d\n"
  72                 "    hashCheckpoint = %s\n"
  73                 ")\n",
  74             nVersion,
  75             hashCheckpoint.ToString().c_str());
  76     }
  77
  78     void print() const
  79     {
  80         printf("%s", ToString().c_str());
  81     }
  82 };
  83
  84 class CSyncCheckpoint : public CUnsignedSyncCheckpoint
  85 {
  86 public:
  87     static const std::string strMasterPubKey;
  88     static std::string strMasterPrivKey;
  89
  90     std::vector<unsigned char> vchMsg;
  91     std::vector<unsigned char> vchSig;
  92
  93     CSyncCheckpoint()
  94     {
  95         SetNull();
  96     }
  97
  98     IMPLEMENT_SERIALIZE
  99     (
 100         READWRITE(vchMsg);
 101         READWRITE(vchSig);
 102     )
 103
 104     void SetNull()
 105     {
 106         CUnsignedSyncCheckpoint::SetNull();
 107         vchMsg.clear();
 108         vchSig.clear();
 109     }
 110
 111     bool IsNull() const
 112     {
 113         return (hashCheckpoint == 0);
 114     }
 115
 116     uint256 GetHash() const
 117     {
 118         return SerializeHash(*this);
 119     }
 120
 121     bool RelayTo(CNode* pnode) const
 122     {
 123         // returns true if wasn't already sent
 124         if (pnode->hashCheckpointKnown != hashCheckpoint)
 125         {
 126             pnode->hashCheckpointKnown = hashCheckpoint;
 127             pnode->PushMessage("checkpoint", *this);
 128             return true;
 129         }
 130         return false;
 131     }
 132
 133     bool CheckSignature();
 134     bool ProcessSyncCheckpoint(CNode* pfrom);
 135 };
 136
 137 #endif