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.
5 #include <boost/assign/list_of.hpp> // for 'map_list_of()'
6 #include <boost/foreach.hpp>
9 #include "checkpoints.h"
17 typedef std::map<int, std::pair<uint256, unsigned int> > MapCheckpoints;
18 typedef std::list<uint256> ListBannedBlocks;
21 // What makes a good checkpoint block?
22 // + Is surrounded by blocks with reasonable timestamps
23 // (no blocks before with a timestamp after, none after with
25 // + Contains no strange transactions
27 static MapCheckpoints mapCheckpoints =
28 boost::assign::map_list_of
29 ( 0, std::make_pair(hashGenesisBlock, 1360105017) )
30 ( 13560, std::make_pair(uint256("0xa1591a0fcbf11f282d671581edb9f0aadcd06fee69761081e0a3245914c13729"), 1364674052) )
31 ( 143990, std::make_pair(uint256("0x00000000001ff5c3940a9f73ad4a990f64955179bde0f743c76dbf0031429efc"), 1418953493) )
32 ( 149000, std::make_pair(uint256("0x7a24acfcadcf43054e7f7d9f273522c0dfc5791ba4006e0273e7521a8d36c525"), 1420872125) )
33 ( 160000, std::make_pair(uint256("0x000000000001cb1133043d38d077c0e93f66c8b2566779f10f182137d1e34a68"), 1425150237) )
34 ( 200000, std::make_pair(uint256("0x0000000000029f8bbf66e6ea6f3e5db55009404aae0fe395a53dd33142b2bff2"), 1441127233) )
35 ( 221047, std::make_pair(uint256("0xa28aef712e7aa0c285bfe29351ca21ed416689139e3063ef770fc826a8b9e9da"), 1449431646) )
38 static ListBannedBlocks listBanned =
39 boost::assign::list_of
40 // Invalid block #221047 with future timestamp of 2016/02/23 09:24:17 UTC
41 ( uint256("0x46223e5432ceffe650d5729b4bb8479dcdf0ca1e534fa8e69382dc87b42ea94b") )
44 // TestNet has no checkpoints
45 static MapCheckpoints mapCheckpointsTestnet =
46 boost::assign::map_list_of
47 ( 0, std::make_pair(hashGenesisBlockTestNet, 1360105017) )
50 bool CheckHardened(int nHeight, const uint256& hash)
52 MapCheckpoints& checkpoints = (fTestNet ? mapCheckpointsTestnet : mapCheckpoints);
54 MapCheckpoints::const_iterator i = checkpoints.find(nHeight);
55 if (i == checkpoints.end()) return true;
56 return hash == i->second.first;
59 bool CheckBanned(const uint256 &nHash)
61 if (fTestNet) // Testnet has no banned blocks
63 ListBannedBlocks::const_iterator it = std::find(listBanned.begin(), listBanned.end(), nHash);
64 return it == listBanned.end();
67 int GetTotalBlocksEstimate()
69 MapCheckpoints& checkpoints = (fTestNet ? mapCheckpointsTestnet : mapCheckpoints);
71 return checkpoints.rbegin()->first;
74 unsigned int GetLastCheckpointTime()
76 MapCheckpoints& checkpoints = (fTestNet ? mapCheckpointsTestnet : mapCheckpoints);
78 return checkpoints.rbegin()->second.second;
81 CBlockIndex* GetLastCheckpoint(const std::map<uint256, CBlockIndex*>& mapBlockIndex)
83 MapCheckpoints& checkpoints = (fTestNet ? mapCheckpointsTestnet : mapCheckpoints);
85 BOOST_REVERSE_FOREACH(const MapCheckpoints::value_type& i, checkpoints)
87 const uint256& hash = i.second.first;
88 std::map<uint256, CBlockIndex*>::const_iterator t = mapBlockIndex.find(hash);
89 if (t != mapBlockIndex.end())
95 // ppcoin: synchronized checkpoint (centrally broadcasted)
96 uint256 hashSyncCheckpoint = 0;
97 uint256 hashPendingCheckpoint = 0;
98 CSyncCheckpoint checkpointMessage;
99 CSyncCheckpoint checkpointMessagePending;
100 uint256 hashInvalidCheckpoint = 0;
101 CCriticalSection cs_hashSyncCheckpoint;
103 // ppcoin: get last synchronized checkpoint
104 CBlockIndex* GetLastSyncCheckpoint()
106 LOCK(cs_hashSyncCheckpoint);
107 if (!mapBlockIndex.count(hashSyncCheckpoint))
108 error("GetSyncCheckpoint: block index missing for current sync-checkpoint %s", hashSyncCheckpoint.ToString().c_str());
110 return mapBlockIndex[hashSyncCheckpoint];
114 // ppcoin: only descendant of current sync-checkpoint is allowed
115 bool ValidateSyncCheckpoint(uint256 hashCheckpoint)
117 if (!mapBlockIndex.count(hashSyncCheckpoint))
118 return error("ValidateSyncCheckpoint: block index missing for current sync-checkpoint %s", hashSyncCheckpoint.ToString().c_str());
119 if (!mapBlockIndex.count(hashCheckpoint))
120 return error("ValidateSyncCheckpoint: block index missing for received sync-checkpoint %s", hashCheckpoint.ToString().c_str());
122 CBlockIndex* pindexSyncCheckpoint = mapBlockIndex[hashSyncCheckpoint];
123 CBlockIndex* pindexCheckpointRecv = mapBlockIndex[hashCheckpoint];
125 if (pindexCheckpointRecv->nHeight <= pindexSyncCheckpoint->nHeight)
127 // Received an older checkpoint, trace back from current checkpoint
128 // to the same height of the received checkpoint to verify
129 // that current checkpoint should be a descendant block
130 CBlockIndex* pindex = pindexSyncCheckpoint;
131 while (pindex->nHeight > pindexCheckpointRecv->nHeight)
132 if (!(pindex = pindex->pprev))
133 return error("ValidateSyncCheckpoint: pprev null - block index structure failure");
134 if (pindex->GetBlockHash() != hashCheckpoint)
136 hashInvalidCheckpoint = hashCheckpoint;
137 return error("ValidateSyncCheckpoint: new sync-checkpoint %s is conflicting with current sync-checkpoint %s", hashCheckpoint.ToString().c_str(), hashSyncCheckpoint.ToString().c_str());
139 return false; // ignore older checkpoint
142 // Received checkpoint should be a descendant block of the current
143 // checkpoint. Trace back to the same height of current checkpoint
145 CBlockIndex* pindex = pindexCheckpointRecv;
146 while (pindex->nHeight > pindexSyncCheckpoint->nHeight)
147 if (!(pindex = pindex->pprev))
148 return error("ValidateSyncCheckpoint: pprev2 null - block index structure failure");
149 if (pindex->GetBlockHash() != hashSyncCheckpoint)
151 hashInvalidCheckpoint = hashCheckpoint;
152 return error("ValidateSyncCheckpoint: new sync-checkpoint %s is not a descendant of current sync-checkpoint %s", hashCheckpoint.ToString().c_str(), hashSyncCheckpoint.ToString().c_str());
157 bool WriteSyncCheckpoint(const uint256& hashCheckpoint)
161 if (!txdb.WriteSyncCheckpoint(hashCheckpoint))
164 return error("WriteSyncCheckpoint(): failed to write to db sync checkpoint %s", hashCheckpoint.ToString().c_str());
166 if (!txdb.TxnCommit())
167 return error("WriteSyncCheckpoint(): failed to commit to db sync checkpoint %s", hashCheckpoint.ToString().c_str());
173 Checkpoints::hashSyncCheckpoint = hashCheckpoint;
177 bool AcceptPendingSyncCheckpoint()
179 LOCK(cs_hashSyncCheckpoint);
180 if (hashPendingCheckpoint != 0 && mapBlockIndex.count(hashPendingCheckpoint))
182 if (!ValidateSyncCheckpoint(hashPendingCheckpoint))
184 hashPendingCheckpoint = 0;
185 checkpointMessagePending.SetNull();
190 CBlockIndex* pindexCheckpoint = mapBlockIndex[hashPendingCheckpoint];
191 if (!pindexCheckpoint->IsInMainChain())
194 if (!block.ReadFromDisk(pindexCheckpoint))
195 return error("AcceptPendingSyncCheckpoint: ReadFromDisk failed for sync checkpoint %s", hashPendingCheckpoint.ToString().c_str());
196 if (!block.SetBestChain(txdb, pindexCheckpoint))
198 hashInvalidCheckpoint = hashPendingCheckpoint;
199 return error("AcceptPendingSyncCheckpoint: SetBestChain failed for sync checkpoint %s", hashPendingCheckpoint.ToString().c_str());
206 if (!WriteSyncCheckpoint(hashPendingCheckpoint))
207 return error("AcceptPendingSyncCheckpoint(): failed to write sync checkpoint %s", hashPendingCheckpoint.ToString().c_str());
208 hashPendingCheckpoint = 0;
209 checkpointMessage = checkpointMessagePending;
210 checkpointMessagePending.SetNull();
211 printf("AcceptPendingSyncCheckpoint : sync-checkpoint at %s\n", hashSyncCheckpoint.ToString().c_str());
212 // relay the checkpoint
213 if (!checkpointMessage.IsNull())
215 BOOST_FOREACH(CNode* pnode, vNodes)
216 checkpointMessage.RelayTo(pnode);
223 // Automatically select a suitable sync-checkpoint
224 uint256 AutoSelectSyncCheckpoint()
226 const CBlockIndex *pindex = pindexBest;
227 // Search backward for a block within max span and maturity window
228 while (pindex->pprev && (pindex->GetBlockTime() + CHECKPOINT_MAX_SPAN > pindexBest->GetBlockTime() || pindex->nHeight + 8 > pindexBest->nHeight))
229 pindex = pindex->pprev;
230 return pindex->GetBlockHash();
233 // Check against synchronized checkpoint
234 bool CheckSync(const uint256& hashBlock, const CBlockIndex* pindexPrev)
236 if (fTestNet) return true; // Testnet has no checkpoints
237 int nHeight = pindexPrev->nHeight + 1;
239 LOCK(cs_hashSyncCheckpoint);
240 // sync-checkpoint should always be accepted block
241 assert(mapBlockIndex.count(hashSyncCheckpoint));
242 const CBlockIndex* pindexSync = mapBlockIndex[hashSyncCheckpoint];
244 if (nHeight > pindexSync->nHeight)
246 // trace back to same height as sync-checkpoint
247 const CBlockIndex* pindex = pindexPrev;
248 while (pindex->nHeight > pindexSync->nHeight)
249 if (!(pindex = pindex->pprev))
250 return error("CheckSync: pprev null - block index structure failure");
251 if (pindex->nHeight < pindexSync->nHeight || pindex->GetBlockHash() != hashSyncCheckpoint)
252 return false; // only descendant of sync-checkpoint can pass check
254 if (nHeight == pindexSync->nHeight && hashBlock != hashSyncCheckpoint)
255 return false; // same height with sync-checkpoint
256 if (nHeight < pindexSync->nHeight && !mapBlockIndex.count(hashBlock))
257 return false; // lower height than sync-checkpoint
261 bool WantedByPendingSyncCheckpoint(uint256 hashBlock)
263 LOCK(cs_hashSyncCheckpoint);
264 if (hashPendingCheckpoint == 0)
266 if (hashBlock == hashPendingCheckpoint)
268 if (mapOrphanBlocks.count(hashPendingCheckpoint)
269 && hashBlock == WantedByOrphan(mapOrphanBlocks[hashPendingCheckpoint]))
274 // ppcoin: reset synchronized checkpoint to last hardened checkpoint
275 bool ResetSyncCheckpoint()
277 LOCK(cs_hashSyncCheckpoint);
278 const uint256& hash = mapCheckpoints.rbegin()->second.first;
279 if (mapBlockIndex.count(hash) && !mapBlockIndex[hash]->IsInMainChain())
281 // checkpoint block accepted but not yet in main chain
282 printf("ResetSyncCheckpoint: SetBestChain to hardened checkpoint %s\n", hash.ToString().c_str());
285 if (!block.ReadFromDisk(mapBlockIndex[hash]))
286 return error("ResetSyncCheckpoint: ReadFromDisk failed for hardened checkpoint %s", hash.ToString().c_str());
287 if (!block.SetBestChain(txdb, mapBlockIndex[hash]))
289 return error("ResetSyncCheckpoint: SetBestChain failed for hardened checkpoint %s", hash.ToString().c_str());
297 else if(!mapBlockIndex.count(hash))
299 // checkpoint block not yet accepted
300 hashPendingCheckpoint = hash;
301 checkpointMessagePending.SetNull();
302 printf("ResetSyncCheckpoint: pending for sync-checkpoint %s\n", hashPendingCheckpoint.ToString().c_str());
305 BOOST_REVERSE_FOREACH(const MapCheckpoints::value_type& i, mapCheckpoints)
307 const uint256& hash = i.second.first;
308 if (mapBlockIndex.count(hash) && mapBlockIndex[hash]->IsInMainChain())
310 if (!WriteSyncCheckpoint(hash))
311 return error("ResetSyncCheckpoint: failed to write sync checkpoint %s", hash.ToString().c_str());
312 printf("ResetSyncCheckpoint: sync-checkpoint reset to %s\n", hashSyncCheckpoint.ToString().c_str());
320 void AskForPendingSyncCheckpoint(CNode* pfrom)
322 LOCK(cs_hashSyncCheckpoint);
323 if (pfrom && hashPendingCheckpoint != 0 && (!mapBlockIndex.count(hashPendingCheckpoint)) && (!mapOrphanBlocks.count(hashPendingCheckpoint)))
324 pfrom->AskFor(CInv(MSG_BLOCK, hashPendingCheckpoint));
327 bool SetCheckpointPrivKey(std::string strPrivKey)
329 // Test signing a sync-checkpoint with genesis block
330 CSyncCheckpoint checkpoint;
331 checkpoint.hashCheckpoint = !fTestNet ? hashGenesisBlock : hashGenesisBlockTestNet;
332 CDataStream sMsg(SER_NETWORK, PROTOCOL_VERSION);
333 sMsg << (CUnsignedSyncCheckpoint)checkpoint;
334 checkpoint.vchMsg = std::vector<unsigned char>(sMsg.begin(), sMsg.end());
336 std::vector<unsigned char> vchPrivKey = ParseHex(strPrivKey);
338 key.SetPrivKey(CPrivKey(vchPrivKey.begin(), vchPrivKey.end())); // if key is not correct openssl may crash
339 if (!key.Sign(Hash(checkpoint.vchMsg.begin(), checkpoint.vchMsg.end()), checkpoint.vchSig))
342 // Test signing successful, proceed
343 CSyncCheckpoint::strMasterPrivKey = strPrivKey;
347 bool SendSyncCheckpoint(uint256 hashCheckpoint)
349 CSyncCheckpoint checkpoint;
350 checkpoint.hashCheckpoint = hashCheckpoint;
351 CDataStream sMsg(SER_NETWORK, PROTOCOL_VERSION);
352 sMsg << (CUnsignedSyncCheckpoint)checkpoint;
353 checkpoint.vchMsg = std::vector<unsigned char>(sMsg.begin(), sMsg.end());
355 if (CSyncCheckpoint::strMasterPrivKey.empty())
356 return error("SendSyncCheckpoint: Checkpoint master key unavailable.");
357 std::vector<unsigned char> vchPrivKey = ParseHex(CSyncCheckpoint::strMasterPrivKey);
359 key.SetPrivKey(CPrivKey(vchPrivKey.begin(), vchPrivKey.end())); // if key is not correct openssl may crash
360 if (!key.Sign(Hash(checkpoint.vchMsg.begin(), checkpoint.vchMsg.end()), checkpoint.vchSig))
361 return error("SendSyncCheckpoint: Unable to sign checkpoint, check private key?");
363 if(!checkpoint.ProcessSyncCheckpoint(NULL))
365 printf("WARNING: SendSyncCheckpoint: Failed to process checkpoint.\n");
372 BOOST_FOREACH(CNode* pnode, vNodes)
373 checkpoint.RelayTo(pnode);
378 // Is the sync-checkpoint outside maturity window?
379 bool IsMatureSyncCheckpoint()
381 LOCK(cs_hashSyncCheckpoint);
382 // sync-checkpoint should always be accepted block
383 assert(mapBlockIndex.count(hashSyncCheckpoint));
384 const CBlockIndex* pindexSync = mapBlockIndex[hashSyncCheckpoint];
385 return (nBestHeight >= pindexSync->nHeight + nCoinbaseMaturity ||
386 pindexSync->GetBlockTime() + nStakeMinAge < GetAdjustedTime());
390 // ppcoin: sync-checkpoint master key
391 const std::string CSyncCheckpoint::strMasterPubKey = "04a51b735f816de4ec3f891d5b38bbc91e1f7245c7c08d17990760b86b4d8fc3910a850ffecf73bfa8886f01739a0c4c4322201282d07b6e48ce931cc92af94850";
393 std::string CSyncCheckpoint::strMasterPrivKey = "";
395 // ppcoin: verify signature of sync-checkpoint message
396 bool CSyncCheckpoint::CheckSignature()
399 if (!key.SetPubKey(ParseHex(CSyncCheckpoint::strMasterPubKey)))
400 return error("CSyncCheckpoint::CheckSignature() : SetPubKey failed");
401 if (!key.Verify(Hash(vchMsg.begin(), vchMsg.end()), vchSig))
402 return error("CSyncCheckpoint::CheckSignature() : verify signature failed");
404 // Now unserialize the data
405 CDataStream sMsg(vchMsg, SER_NETWORK, PROTOCOL_VERSION);
406 sMsg >> *(CUnsignedSyncCheckpoint*)this;
410 // process synchronized checkpoint
411 bool CSyncCheckpoint::ProcessSyncCheckpoint(CNode* pfrom)
413 if (!CheckSignature())
416 LOCK(Checkpoints::cs_hashSyncCheckpoint);
417 if (!mapBlockIndex.count(hashCheckpoint))
419 // We haven't received the checkpoint chain, keep the checkpoint as pending
420 Checkpoints::hashPendingCheckpoint = hashCheckpoint;
421 Checkpoints::checkpointMessagePending = *this;
422 printf("ProcessSyncCheckpoint: pending for sync-checkpoint %s\n", hashCheckpoint.ToString().c_str());
423 // Ask this guy to fill in what we're missing
426 pfrom->PushGetBlocks(pindexBest, hashCheckpoint);
427 // ask directly as well in case rejected earlier by duplicate
428 // proof-of-stake because getblocks may not get it this time
429 pfrom->AskFor(CInv(MSG_BLOCK, mapOrphanBlocks.count(hashCheckpoint)? WantedByOrphan(mapOrphanBlocks[hashCheckpoint]) : hashCheckpoint));
434 if (!Checkpoints::ValidateSyncCheckpoint(hashCheckpoint))
438 CBlockIndex* pindexCheckpoint = mapBlockIndex[hashCheckpoint];
439 if (!pindexCheckpoint->IsInMainChain())
441 // checkpoint chain received but not yet main chain
443 if (!block.ReadFromDisk(pindexCheckpoint))
444 return error("ProcessSyncCheckpoint: ReadFromDisk failed for sync checkpoint %s", hashCheckpoint.ToString().c_str());
445 if (!block.SetBestChain(txdb, pindexCheckpoint))
447 Checkpoints::hashInvalidCheckpoint = hashCheckpoint;
448 return error("ProcessSyncCheckpoint: SetBestChain failed for sync checkpoint %s", hashCheckpoint.ToString().c_str());
456 if (!Checkpoints::WriteSyncCheckpoint(hashCheckpoint))
457 return error("ProcessSyncCheckpoint(): failed to write sync checkpoint %s", hashCheckpoint.ToString().c_str());
458 Checkpoints::checkpointMessage = *this;
459 Checkpoints::hashPendingCheckpoint = 0;
460 Checkpoints::checkpointMessagePending.SetNull();
461 printf("ProcessSyncCheckpoint: sync-checkpoint at %s\n", hashCheckpoint.ToString().c_str());