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     extern uint256 hashSyncCheckpoint;
  32     extern CSyncCheckpoint checkpointMessage;
  33     extern uint256 hashInvalidCheckpoint;
  34     extern CCriticalSection cs_hashSyncCheckpoint;
  35
  36     CBlockIndex* GetLastSyncCheckpoint();
  37     bool WriteSyncCheckpoint(const uint256& hashCheckpoint);
  38     bool AcceptPendingSyncCheckpoint();
  39     uint256 AutoSelectSyncCheckpoint();
  40     bool CheckSync(const uint256& hashBlock, const CBlockIndex* pindexPrev);
  41     bool WantedByPendingSyncCheckpoint(uint256 hashBlock);
  42     bool ResetSyncCheckpoint();
  43     void AskForPendingSyncCheckpoint(CNode* pfrom);
  44     bool SetCheckpointPrivKey(std::string strPrivKey);
  45     bool SendSyncCheckpoint(uint256 hashCheckpoint);
  46     bool IsMatureSyncCheckpoint();
  47     bool IsSyncCheckpointTooOld(unsigned int nSeconds);
  48 }
  49
  50 // ppcoin: synchronized checkpoint
  51 class CUnsignedSyncCheckpoint
  52 {
  53 public:
  54     int nVersion;
  55     uint256 hashCheckpoint;      // checkpoint block
  56
  57     IMPLEMENT_SERIALIZE
  58     (
  59         READWRITE(this->nVersion);
  60         nVersion = this->nVersion;
  61         READWRITE(hashCheckpoint);
  62     )
  63
  64     void SetNull()
  65     {
  66         nVersion = 1;
  67         hashCheckpoint = 0;
  68     }
  69
  70     std::string ToString() const
  71     {
  72         return strprintf(
  73                 "CSyncCheckpoint(\n"
  74                 "    nVersion       = %d\n"
  75                 "    hashCheckpoint = %s\n"
  76                 ")\n",
  77             nVersion,
  78             hashCheckpoint.ToString().c_str());
  79     }
  80
  81     void print() const
  82     {
  83         printf("%s", ToString().c_str());
  84     }
  85 };
  86
  87 class CSyncCheckpoint : public CUnsignedSyncCheckpoint
  88 {
  89 public:
  90     static const std::string strMasterPubKey;
  91     static std::string strMasterPrivKey;
  92
  93     std::vector<unsigned char> vchMsg;
  94     std::vector<unsigned char> vchSig;
  95
  96     CSyncCheckpoint()
  97     {
  98         SetNull();
  99     }
 100
 101     IMPLEMENT_SERIALIZE
 102     (
 103         READWRITE(vchMsg);
 104         READWRITE(vchSig);
 105     )
 106
 107     void SetNull()
 108     {
 109         CUnsignedSyncCheckpoint::SetNull();
 110         vchMsg.clear();
 111         vchSig.clear();
 112     }
 113
 114     bool IsNull() const
 115     {
 116         return (hashCheckpoint == 0);
 117     }
 118
 119     uint256 GetHash() const
 120     {
 121         return SerializeHash(*this);
 122     }
 123
 124     bool RelayTo(CNode* pnode) const
 125     {
 126         // returns true if wasn't already sent
 127         if (pnode->hashCheckpointKnown != hashCheckpoint)
 128         {
 129             pnode->hashCheckpointKnown = hashCheckpoint;
 130             pnode->PushMessage("checkpoint", *this);
 131             return true;
 132         }
 133         return false;
 134     }
 135
 136     bool CheckSignature();
 137     bool ProcessSyncCheckpoint(CNode* pfrom);
 138 };
 139
 140 #endif