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 * 30) // minimum age 30 days for coin age
  13 #define STAKE_MAX_AGE (60 * 60 * 24 * 90) // stake age for full weight
  14 #define CHECKPOINT_MAX_SPAN (60 * 60 * 4) // max 4 hours before latest block
  15
  16 class uint256;
  17 class CBlockIndex;
  18 class CSyncCheckpoint;
  19
  20 /** Block-chain checkpoints are compiled-in sanity checks.
  21  * They are updated every release or three.
  22  */
  23 namespace Checkpoints
  24 {
  25     // Returns true if block passes checkpoint checks
  26     bool CheckHardened(int nHeight, const uint256& hash);
  27
  28     // Return conservative estimate of total number of blocks, 0 if unknown
  29     int GetTotalBlocksEstimate();
  30
  31     // Returns last CBlockIndex* in mapBlockIndex that is a checkpoint
  32     CBlockIndex* GetLastCheckpoint(const std::map<uint256, CBlockIndex*>& mapBlockIndex);
  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 }
  51
  52 // ppcoin: synchronized checkpoint
  53 class CUnsignedSyncCheckpoint
  54 {
  55 public:
  56     int nVersion;
  57     uint256 hashCheckpoint;      // checkpoint block
  58
  59     IMPLEMENT_SERIALIZE
  60     (
  61         READWRITE(this->nVersion);
  62         nVersion = this->nVersion;
  63         READWRITE(hashCheckpoint);
  64     )
  65
  66     void SetNull()
  67     {
  68         nVersion = 1;
  69         hashCheckpoint = 0;
  70     }
  71
  72     std::string ToString() const
  73     {
  74         return strprintf(
  75                 "CSyncCheckpoint(\n"
  76                 "    nVersion       = %d\n"
  77                 "    hashCheckpoint = %s\n"
  78                 ")\n",
  79             nVersion,
  80             hashCheckpoint.ToString().c_str());
  81     }
  82
  83     void print() const
  84     {
  85         printf("%s", ToString().c_str());
  86     }
  87 };
  88
  89 class CSyncCheckpoint : public CUnsignedSyncCheckpoint
  90 {
  91 public:
  92     static const std::string strMasterPubKey;
  93     static std::string strMasterPrivKey;
  94
  95     std::vector<unsigned char> vchMsg;
  96     std::vector<unsigned char> vchSig;
  97
  98     CSyncCheckpoint()
  99     {
 100         SetNull();
 101     }
 102
 103     IMPLEMENT_SERIALIZE
 104     (
 105         READWRITE(vchMsg);
 106         READWRITE(vchSig);
 107     )
 108
 109     void SetNull()
 110     {
 111         CUnsignedSyncCheckpoint::SetNull();
 112         vchMsg.clear();
 113         vchSig.clear();
 114     }
 115
 116     bool IsNull() const
 117     {
 118         return (hashCheckpoint == 0);
 119     }
 120
 121     uint256 GetHash() const
 122     {
 123         return SerializeHash(*this);
 124     }
 125
 126     bool RelayTo(CNode* pnode) const
 127     {
 128         // returns true if wasn't already sent
 129         if (pnode->hashCheckpointKnown != hashCheckpoint)
 130         {
 131             pnode->hashCheckpointKnown = hashCheckpoint;
 132             pnode->PushMessage("checkpoint", *this);
 133             return true;
 134         }
 135         return false;
 136     }
 137
 138     bool CheckSignature();
 139     bool ProcessSyncCheckpoint(CNode* pfrom);
 140 };
 141
 142 #endif