// Copyright (c) 2009-2012 The Bitcoin developers
+// Copyright (c) 2011-2012 The PPCoin developers
// Distributed under the MIT/X11 software license, see the accompanying
-// file license.txt or http://www.opensource.org/licenses/mit-license.php.
+// file COPYING or http://www.opensource.org/licenses/mit-license.php.
#include <boost/assign/list_of.hpp> // for 'map_list_of()'
#include <boost/foreach.hpp>
-#include "headers.h"
#include "checkpoints.h"
+#include "db.h"
+#include "main.h"
+#include "uint256.h"
+
namespace Checkpoints
{
- typedef std::map<int, uint256> MapCheckpoints;
+ typedef std::map<int, uint256> MapCheckpoints; // hardened checkpoints
//
// What makes a good checkpoint block?
//
static MapCheckpoints mapCheckpoints =
boost::assign::map_list_of
- ( 11111, uint256("0x0000000069e244f73d78e8fd29ba2fd2ed618bd6fa2ee92559f542fdb26e7c1d"))
- ( 33333, uint256("0x000000002dd5588a74784eaa7ab0507a18ad16a236e7b1ce69f00d7ddfb5d0a6"))
- ( 68555, uint256("0x00000000001e1b4903550a0b96e9a9405c8a95f387162e4944e8d9fbe501cd6a"))
- ( 70567, uint256("0x00000000006a49b14bcf27462068f1264c961f11fa2e0eddd2be0791e1d4124a"))
- ( 74000, uint256("0x0000000000573993a3c9e41ce34471c079dcf5f52a0e824a81e7f953b8661a20"))
- (105000, uint256("0x00000000000291ce28027faea320c8d2b054b2e0fe44a773f3eefb151d6bdc97"))
- (118000, uint256("0x000000000000774a7f8a7a12dc906ddb9e17e75d684f15e00f8767f9e8f36553"))
- (134444, uint256("0x00000000000005b12ffd4cd315cd34ffd4a594f430ac814c91184a0d42d2b0fe"))
- (140700, uint256("0x000000000000033b512028abb90e1626d8b346fd0ed598ac0a3c371138dce2bd"))
- (168000, uint256("0x000000000000099e61ea72015e79632f216fe6cb33d7899acb35b75c8303b763"))
- ;
-
- bool CheckBlock(int nHeight, const uint256& hash)
+ ( 0, hashGenesisBlockOfficial )
+ ; // ppcoin: no checkpoint yet; to be created in future releases
+
+ bool CheckHardened(int nHeight, const uint256& hash)
{
if (fTestNet) return true; // Testnet has no checkpoints
CBlockIndex* GetLastCheckpoint(const std::map<uint256, CBlockIndex*>& mapBlockIndex)
{
- if (fTestNet) return NULL;
+ if (fTestNet) {
+ std::map<uint256, CBlockIndex*>::const_iterator t = mapBlockIndex.find(hashGenesisBlock);
+ if (t != mapBlockIndex.end())
+ return t->second;
+ return NULL;
+ }
BOOST_REVERSE_FOREACH(const MapCheckpoints::value_type& i, mapCheckpoints)
{
}
return NULL;
}
+
+ // ppcoin: synchronized checkpoint (centrally broadcasted)
+ uint256 hashSyncCheckpoint = 0;
+ uint256 hashPendingCheckpoint = 0;
+ CSyncCheckpoint checkpointMessage;
+ CSyncCheckpoint checkpointMessagePending;
+ uint256 hashInvalidCheckpoint = 0;
+ CCriticalSection cs_hashSyncCheckpoint;
+
+ // ppcoin: get last synchronized checkpoint
+ CBlockIndex* GetLastSyncCheckpoint()
+ {
+ LOCK(cs_hashSyncCheckpoint);
+ if (!mapBlockIndex.count(hashSyncCheckpoint))
+ error("GetSyncCheckpoint: block index missing for current sync-checkpoint %s", hashSyncCheckpoint.ToString().c_str());
+ else
+ return mapBlockIndex[hashSyncCheckpoint];
+ return NULL;
+ }
+
+ // ppcoin: only descendant of current sync-checkpoint is allowed
+ bool ValidateSyncCheckpoint(uint256 hashCheckpoint)
+ {
+ if (!mapBlockIndex.count(hashSyncCheckpoint))
+ return error("ValidateSyncCheckpoint: block index missing for current sync-checkpoint %s", hashSyncCheckpoint.ToString().c_str());
+ if (!mapBlockIndex.count(hashCheckpoint))
+ return error("ValidateSyncCheckpoint: block index missing for received sync-checkpoint %s", hashCheckpoint.ToString().c_str());
+
+ CBlockIndex* pindexSyncCheckpoint = mapBlockIndex[hashSyncCheckpoint];
+ CBlockIndex* pindexCheckpointRecv = mapBlockIndex[hashCheckpoint];
+
+ if (pindexCheckpointRecv->nHeight <= pindexSyncCheckpoint->nHeight)
+ {
+ // Received an older checkpoint, trace back from current checkpoint
+ // to the same height of the received checkpoint to verify
+ // that current checkpoint should be a descendant block
+ CBlockIndex* pindex = pindexSyncCheckpoint;
+ while (pindex->nHeight > pindexCheckpointRecv->nHeight)
+ if (!(pindex = pindex->pprev))
+ return error("ValidateSyncCheckpoint: pprev1 null - block index structure failure");
+ if (pindex->GetBlockHash() != hashCheckpoint)
+ {
+ hashInvalidCheckpoint = hashCheckpoint;
+ return error("ValidateSyncCheckpoint: new sync-checkpoint %s is conflicting with current sync-checkpoint %s", hashCheckpoint.ToString().c_str(), hashSyncCheckpoint.ToString().c_str());
+ }
+ return false; // ignore older checkpoint
+ }
+
+ // Received checkpoint should be a descendant block of the current
+ // checkpoint. Trace back to the same height of current checkpoint
+ // to verify.
+ CBlockIndex* pindex = pindexCheckpointRecv;
+ while (pindex->nHeight > pindexSyncCheckpoint->nHeight)
+ if (!(pindex = pindex->pprev))
+ return error("ValidateSyncCheckpoint: pprev2 null - block index structure failure");
+ if (pindex->GetBlockHash() != hashSyncCheckpoint)
+ {
+ hashInvalidCheckpoint = hashCheckpoint;
+ return error("ValidateSyncCheckpoint: new sync-checkpoint %s is not a descendant of current sync-checkpoint %s", hashCheckpoint.ToString().c_str(), hashSyncCheckpoint.ToString().c_str());
+ }
+ return true;
+ }
+
+ bool WriteSyncCheckpoint(const uint256& hashCheckpoint)
+ {
+ CTxDB txdb;
+ txdb.TxnBegin();
+ if (!txdb.WriteSyncCheckpoint(hashCheckpoint))
+ {
+ txdb.TxnAbort();
+ return error("WriteSyncCheckpoint(): failed to write to db sync checkpoint %s", hashCheckpoint.ToString().c_str());
+ }
+ if (!txdb.TxnCommit())
+ return error("WriteSyncCheckpoint(): failed to commit to db sync checkpoint %s", hashCheckpoint.ToString().c_str());
+ txdb.Close();
+
+ Checkpoints::hashSyncCheckpoint = hashCheckpoint;
+ return true;
+ }
+
+ bool AcceptPendingSyncCheckpoint()
+ {
+ LOCK(cs_hashSyncCheckpoint);
+ if (hashPendingCheckpoint != 0 && mapBlockIndex.count(hashPendingCheckpoint))
+ {
+ if (!ValidateSyncCheckpoint(hashPendingCheckpoint))
+ {
+ hashPendingCheckpoint = 0;
+ checkpointMessagePending.SetNull();
+ return false;
+ }
+
+ CTxDB txdb;
+ CBlockIndex* pindexCheckpoint = mapBlockIndex[hashPendingCheckpoint];
+ if (!pindexCheckpoint->IsInMainChain())
+ {
+ txdb.TxnBegin();
+ if (!Reorganize(txdb, pindexCheckpoint))
+ {
+ txdb.TxnAbort();
+ hashInvalidCheckpoint = hashPendingCheckpoint;
+ return error("ProcessSyncCheckpoint: Reorganize failed for sync checkpoint %s", hashPendingCheckpoint.ToString().c_str());
+ }
+ }
+ txdb.Close();
+
+ if (!WriteSyncCheckpoint(hashPendingCheckpoint))
+ return error("AcceptPendingSyncCheckpoint(): failed to write sync checkpoint %s", hashPendingCheckpoint.ToString().c_str());
+ hashPendingCheckpoint = 0;
+ checkpointMessage = checkpointMessagePending;
+ checkpointMessagePending.SetNull();
+ printf("AcceptPendingSyncCheckpoint : sync-checkpoint at %s\n", hashSyncCheckpoint.ToString().c_str());
+ // relay the checkpoint
+ if (!checkpointMessage.IsNull())
+ {
+ BOOST_FOREACH(CNode* pnode, vNodes)
+ checkpointMessage.RelayTo(pnode);
+ }
+ return true;
+ }
+ return false;
+ }
+
+ bool CheckSync(const uint256& hashBlock, const CBlockIndex* pindexPrev)
+ {
+ if (fTestNet) return true; // Testnet has no checkpoints
+ int nHeight = pindexPrev->nHeight + 1;
+
+ LOCK(cs_hashSyncCheckpoint);
+ // sync-checkpoint should always be accepted block
+ assert(mapBlockIndex.count(hashSyncCheckpoint));
+ const CBlockIndex* pindexSync = mapBlockIndex[hashSyncCheckpoint];
+
+ if (nHeight > pindexSync->nHeight)
+ {
+ // trace back to same height as sync-checkpoint
+ const CBlockIndex* pindex = pindexPrev;
+ while (pindex->nHeight > pindexSync->nHeight)
+ if (!(pindex = pindex->pprev))
+ return error("CheckSync: pprev null - block index structure failure");
+ if (pindex->nHeight < pindexSync->nHeight || pindex->GetBlockHash() != hashSyncCheckpoint)
+ return false; // only descendant of sync-checkpoint can pass check
+ }
+ if (nHeight == pindexSync->nHeight && hashBlock != hashSyncCheckpoint)
+ return false; // same height with sync-checkpoint
+ if (nHeight < pindexSync->nHeight && !mapBlockIndex.count(hashBlock))
+ return false; // lower height than sync-checkpoint
+ return true;
+ }
+
+ bool WantedByPendingSyncCheckpoint(uint256 hashBlock)
+ {
+ LOCK(cs_hashSyncCheckpoint);
+ if (hashPendingCheckpoint == 0)
+ return false;
+ if (hashBlock == hashPendingCheckpoint)
+ return true;
+ if (mapOrphanBlocks.count(hashPendingCheckpoint)
+ && hashBlock == WantedByOrphan(mapOrphanBlocks[hashPendingCheckpoint]))
+ return true;
+ return false;
+ }
+
+ // ppcoin: reset synchronized checkpoint to last hardened checkpoint
+ bool ResetSyncCheckpoint()
+ {
+ LOCK(cs_hashSyncCheckpoint);
+ const uint256& hash = mapCheckpoints.rbegin()->second;
+ if (mapBlockIndex.count(hash) && !mapBlockIndex[hash]->IsInMainChain())
+ {
+ // checkpoint block accepted but not yet in main chain
+ printf("ResetSyncCheckpoint: Reorganize to hardened checkpoint %s\n", hash.ToString().c_str());
+ CTxDB txdb;
+ txdb.TxnBegin();
+ if (!Reorganize(txdb, mapBlockIndex[hash]))
+ {
+ txdb.TxnAbort();
+ return error("ResetSyncCheckpoint: Reorganize failed for hardened checkpoint %s", hash.ToString().c_str());
+ }
+ txdb.Close();
+ }
+ else if(!mapBlockIndex.count(hash))
+ {
+ // checkpoint block not yet accepted
+ hashPendingCheckpoint = hash;
+ checkpointMessagePending.SetNull();
+ printf("ResetSyncCheckpoint: pending for sync-checkpoint %s\n", hashPendingCheckpoint.ToString().c_str());
+ }
+
+ BOOST_REVERSE_FOREACH(const MapCheckpoints::value_type& i, mapCheckpoints)
+ {
+ const uint256& hash = i.second;
+ if (mapBlockIndex.count(hash) && mapBlockIndex[hash]->IsInMainChain())
+ {
+ if (!WriteSyncCheckpoint(hash))
+ return error("ResetSyncCheckpoint: failed to write sync checkpoint %s", hash.ToString().c_str());
+ printf("ResetSyncCheckpoint: sync-checkpoint reset to %s\n", hashSyncCheckpoint.ToString().c_str());
+ return true;
+ }
+ }
+
+ return false;
+ }
+
+ void AskForPendingSyncCheckpoint(CNode* pfrom)
+ {
+ LOCK(cs_hashSyncCheckpoint);
+ if (pfrom && hashPendingCheckpoint != 0 && (!mapBlockIndex.count(hashPendingCheckpoint)) && (!mapOrphanBlocks.count(hashPendingCheckpoint)))
+ pfrom->AskFor(CInv(MSG_BLOCK, hashPendingCheckpoint));
+ }
+
+ bool SendSyncCheckpoint(uint256 hashCheckpoint)
+ {
+ CSyncCheckpoint checkpoint;
+ checkpoint.hashCheckpoint = hashCheckpoint;
+ CDataStream sMsg(SER_NETWORK, PROTOCOL_VERSION);
+ sMsg << (CUnsignedSyncCheckpoint)checkpoint;
+ checkpoint.vchMsg = std::vector<unsigned char>(sMsg.begin(), sMsg.end());
+
+ if (CSyncCheckpoint::strMasterPrivKey.empty())
+ return error("SendSyncCheckpoint: Checkpoint master key unavailable.");
+ std::vector<unsigned char> vchPrivKey = ParseHex(CSyncCheckpoint::strMasterPrivKey);
+ CKey key;
+ key.SetPrivKey(CPrivKey(vchPrivKey.begin(), vchPrivKey.end())); // if key is not correct openssl may crash
+ if (!key.Sign(Hash(checkpoint.vchMsg.begin(), checkpoint.vchMsg.end()), checkpoint.vchSig))
+ return error("SendSyncCheckpoint: Unable to sign checkpoint, check private key?");
+
+ if(!checkpoint.ProcessSyncCheckpoint(NULL))
+ return error("SendSyncCheckpoint: Failed to process checkpoint.");
+ // Relay checkpoint
+ {
+ LOCK(cs_vNodes);
+ BOOST_FOREACH(CNode* pnode, vNodes)
+ checkpoint.RelayTo(pnode);
+ }
+ return true;
+ }
+}
+
+// ppcoin: sync-checkpoint master key
+const std::string CSyncCheckpoint::strMasterPubKey = "0424f20205e5da98ba632bbd278a11a6499585f62bfb2c782377ef59f0251daab8085fc31471bcb8180bc75ed0fa41bb50c7c084511d54015a3a5241d645c7268a";
+
+std::string CSyncCheckpoint::strMasterPrivKey = "";
+
+// ppcoin: verify signature of sync-checkpoint message
+bool CSyncCheckpoint::CheckSignature()
+{
+ CKey key;
+ if (!key.SetPubKey(ParseHex(CSyncCheckpoint::strMasterPubKey)))
+ return error("CSyncCheckpoint::CheckSignature() : SetPubKey failed");
+ if (!key.Verify(Hash(vchMsg.begin(), vchMsg.end()), vchSig))
+ return error("CSyncCheckpoint::CheckSignature() : verify signature failed");
+
+ // Now unserialize the data
+ CDataStream sMsg(vchMsg, SER_NETWORK, PROTOCOL_VERSION);
+ sMsg >> *(CUnsignedSyncCheckpoint*)this;
+ return true;
+}
+
+// ppcoin: process synchronized checkpoint
+bool CSyncCheckpoint::ProcessSyncCheckpoint(CNode* pfrom)
+{
+ if (!CheckSignature())
+ return false;
+
+ LOCK(Checkpoints::cs_hashSyncCheckpoint);
+ if (!mapBlockIndex.count(hashCheckpoint))
+ {
+ // We haven't received the checkpoint chain, keep the checkpoint as pending
+ Checkpoints::hashPendingCheckpoint = hashCheckpoint;
+ Checkpoints::checkpointMessagePending = *this;
+ printf("ProcessSyncCheckpoint: pending for sync-checkpoint %s\n", hashCheckpoint.ToString().c_str());
+ // Ask this guy to fill in what we're missing
+ if (pfrom)
+ {
+ pfrom->PushGetBlocks(pindexBest, hashCheckpoint);
+ // ask directly as well in case rejected earlier by duplicate
+ // proof-of-stake because getblocks may not get it this time
+ pfrom->AskFor(CInv(MSG_BLOCK, mapOrphanBlocks.count(hashCheckpoint)? WantedByOrphan(mapOrphanBlocks[hashCheckpoint]) : hashCheckpoint));
+ }
+ return false;
+ }
+
+ if (!Checkpoints::ValidateSyncCheckpoint(hashCheckpoint))
+ return false;
+
+ CTxDB txdb;
+ CBlockIndex* pindexCheckpoint = mapBlockIndex[hashCheckpoint];
+ if (!pindexCheckpoint->IsInMainChain())
+ {
+ // checkpoint chain received but not yet main chain
+ txdb.TxnBegin();
+ if (!Reorganize(txdb, pindexCheckpoint))
+ {
+ txdb.TxnAbort();
+ Checkpoints::hashInvalidCheckpoint = hashCheckpoint;
+ return error("ProcessSyncCheckpoint: Reorganize failed for sync checkpoint %s", hashCheckpoint.ToString().c_str());
+ }
+ }
+ txdb.Close();
+
+ if (!Checkpoints::WriteSyncCheckpoint(hashCheckpoint))
+ return error("ProcessSyncCheckpoint(): failed to write sync checkpoint %s", hashCheckpoint.ToString().c_str());
+ Checkpoints::checkpointMessage = *this;
+ Checkpoints::hashPendingCheckpoint = 0;
+ Checkpoints::checkpointMessagePending.SetNull();
+ printf("ProcessSyncCheckpoint: sync-checkpoint at %s\n", hashCheckpoint.ToString().c_str());
+ return true;
}