src/checkpoints.h

   1 // Copyright (c) 2011 The Bitcoin developers
   2 // Copyright (c) 2011-2012 The PPCoin developers
   3 // Distributed under the MIT/X11 software license, see the accompanying
   4 // file license.txt 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 "util.h"
  10
  11 // ppcoin: auto checkpoint min at 8 hours; max at 16 hours
  12 #define AUTO_CHECKPOINT_MIN_SPAN   (60 * 60 * 8)
  13 #define AUTO_CHECKPOINT_MAX_SPAN   (60 * 60 * 16)
  14 #define AUTO_CHECKPOINT_TRUST_SPAN (60 * 60 * 24)
  15
  16 class uint256;
  17 class CBlockIndex;
  18
  19 // ppcoin: synchronized checkpoint
  20 class CUnsignedSyncCheckpoint
  21 {
  22 public:
  23     int nVersion;
  24     uint256 hashCheckpoint;      // checkpoint block
  25
  26     IMPLEMENT_SERIALIZE
  27     (
  28         READWRITE(this->nVersion);
  29         nVersion = this->nVersion;
  30         READWRITE(hashCheckpoint);
  31     )
  32
  33     void SetNull()
  34     {
  35         nVersion = 1;
  36         hashCheckpoint = 0;
  37     }
  38
  39     std::string ToString() const
  40     {
  41         return strprintf(
  42                 "CSyncCheckpoint(\n"
  43                 "    nVersion       = %d\n"
  44                 "    hashCheckpoint = %s\n"
  45                 ")\n",
  46             nVersion,
  47             hashCheckpoint.ToString().c_str());
  48     }
  49
  50     void print() const
  51     {
  52         printf("%s", ToString().c_str());
  53     }
  54 };
  55
  56 class CSyncCheckpoint : public CUnsignedSyncCheckpoint
  57 {
  58 public:
  59     static const std::string strMasterPubKey;
  60
  61     std::vector<unsigned char> vchMsg;
  62     std::vector<unsigned char> vchSig;
  63
  64     CSyncCheckpoint()
  65     {
  66         SetNull();
  67     }
  68
  69     IMPLEMENT_SERIALIZE
  70     (
  71         READWRITE(vchMsg);
  72         READWRITE(vchSig);
  73     )
  74
  75     void SetNull()
  76     {
  77         CUnsignedSyncCheckpoint::SetNull();
  78         vchMsg.clear();
  79         vchSig.clear();
  80     }
  81
  82     bool IsNull() const
  83     {
  84         return (hashCheckpoint == 0);
  85     }
  86
  87     uint256 GetHash() const
  88     {
  89         return SerializeHash(*this);
  90     }
  91
  92     bool RelayTo(CNode* pnode) const
  93     {
  94         // returns true if wasn't already sent
  95         if (pnode->hashCheckpointKnown != hashCheckpoint)
  96         {
  97             pnode->hashCheckpointKnown = hashCheckpoint;
  98             pnode->PushMessage("checkpoint", *this);
  99             return true;
 100         }
 101         return false;
 102     }
 103
 104     bool CheckSignature();
 105     bool ProcessSyncCheckpoint(CNode* pfrom);
 106 };
 107
 108 //
 109 // Block-chain checkpoints are compiled-in sanity checks.
 110 // They are updated every release or three.
 111 //
 112 namespace Checkpoints
 113 {
 114     // Returns true if block passes checkpoint checks
 115     bool CheckHardened(int nHeight, const uint256& hash);
 116
 117     // Return conservative estimate of total number of blocks, 0 if unknown
 118     int GetTotalBlocksEstimate();
 119
 120     // Returns last CBlockIndex* in mapBlockIndex that is a checkpoint
 121     CBlockIndex* GetLastCheckpoint(const std::map<uint256, CBlockIndex*>& mapBlockIndex);
 122
 123     extern uint256 hashSyncCheckpoint;
 124     extern CSyncCheckpoint checkpointMessage;
 125     extern uint256 hashInvalidCheckpoint;
 126     extern CCriticalSection cs_hashSyncCheckpoint;
 127
 128     bool AcceptPendingSyncCheckpoint();
 129     uint256 AutoSelectSyncCheckpoint();
 130     bool CheckSync(const uint256& hashBlock, const CBlockIndex* pindexPrev);
 131     bool IsPendingSyncCheckpoint(uint256 hashBlock);
 132
 133     // ppcoin: automatic checkpoint
 134     extern int nAutoCheckpoint;
 135     extern int nBranchPoint;
 136
 137     bool CheckAuto(const CBlockIndex *pindex);
 138     int  GetNextChainCheckpoint(const CBlockIndex *pindex);
 139     int  GetNextAutoCheckpoint(int nCheckpoint);
 140     void AdvanceAutoCheckpoint(int nCheckpoint);
 141     bool ResetAutoCheckpoint(int nCheckpoint);
 142 }
 143
 144 #endif