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 //
  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     // ppcoin: synchronized checkpoint
  35     extern uint256 hashSyncCheckpoint;
  36
  37     class CUnsignedSyncCheckpoint
  38     {
  39     public:
  40         int nVersion;
  41         uint256 hashCheckpoint;      // checkpoint block
  42
  43         IMPLEMENT_SERIALIZE
  44         (
  45             READWRITE(this->nVersion);
  46             nVersion = this->nVersion;
  47             READWRITE(hashCheckpoint);
  48         )
  49
  50         void SetNull()
  51         {
  52             nVersion = 1;
  53             hashCheckpoint = 0;
  54         }
  55
  56         std::string ToString() const
  57         {
  58             return strprintf(
  59                     "CSyncCheckpoint(\n"
  60                     "    nVersion       = %d\n"
  61                     "    hashCheckpoint = %s\n"
  62                     ")\n",
  63                 nVersion,
  64                 hashCheckpoint.ToString().c_str());
  65         }
  66
  67         void print() const
  68         {
  69             printf("%s", ToString().c_str());
  70         }
  71     };
  72
  73     class CSyncCheckpoint : public CUnsignedSyncCheckpoint
  74     {
  75     public:
  76         std::vector<unsigned char> vchMsg;
  77         std::vector<unsigned char> vchSig;
  78
  79         CSyncCheckpoint()
  80         {
  81             SetNull();
  82         }
  83
  84         IMPLEMENT_SERIALIZE
  85         (
  86             READWRITE(vchMsg);
  87             READWRITE(vchSig);
  88         )
  89
  90         void SetNull()
  91         {
  92             CUnsignedSyncCheckpoint::SetNull();
  93             vchMsg.clear();
  94             vchSig.clear();
  95         }
  96
  97         bool IsNull() const
  98         {
  99             return (hashCheckpoint == 0);
 100         }
 101
 102         uint256 GetHash() const
 103         {
 104             return SerializeHash(*this);
 105         }
 106
 107         bool RelayTo(CNode* pnode) const
 108         {
 109             // returns true if wasn't already sent
 110             if (pnode->hashCheckpointKnown != hashCheckpoint)
 111             {
 112                 pnode->hashCheckpointKnown = hashCheckpoint;
 113                 pnode->PushMessage("checkpoint", *this);
 114                 return true;
 115             }
 116             return false;
 117         }
 118
 119         bool CheckSignature()
 120         {
 121             CKey key;
 122             if (!key.SetPubKey(ParseHex("0487ca85b6ae9d311f996c7616d20d0c88a5b4f07d25e78f419019f35cce6522acf978b2d99f0e7a58db1f120439e5c1889266927854aa57c93956c2569188a539")))
 123                 return error("CSyncCheckpoint::CheckSignature() : SetPubKey failed");
 124             if (!key.Verify(Hash(vchMsg.begin(), vchMsg.end()), vchSig))
 125                 return error("CSyncCheckpoint::CheckSignature() : verify signature failed");
 126
 127             // Now unserialize the data
 128             CDataStream sMsg(vchMsg);
 129             sMsg >> *(CUnsignedSyncCheckpoint*)this;
 130             return true;
 131         }
 132
 133         bool ProcessSyncCheckpoint();
 134     };
 135
 136     // ppcoin: automatic checkpoint
 137     extern int nAutoCheckpoint;
 138     extern int nBranchPoint;
 139
 140     bool CheckAuto(const CBlockIndex *pindex);
 141     int  GetNextChainCheckpoint(const CBlockIndex *pindex);
 142     int  GetNextAutoCheckpoint(int nCheckpoint);
 143     void AdvanceAutoCheckpoint(int nCheckpoint);
 144     bool ResetAutoCheckpoint(int nCheckpoint);
 145 }
 146
 147 #endif