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