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) )
36 ( 243100, std::make_pair(uint256("0x000000000006522d1ebc0734cb0e6b83f5d4da0c3cbc72bd91b82016f611c4f0"), 1458215793) )
37 ( 532000, std::make_pair(uint256("0x0000000000018b7eba5e189c41605780c8a855f74144fa837fa05fa4c67b6ba9"), 1569359486) )
40 static ListBannedBlocks listBanned =
41 boost::assign::list_of
42 // Invalid block #221047 with future timestamp of 2016/02/23 09:24:17 UTC
43 ( uint256("0x46223e5432ceffe650d5729b4bb8479dcdf0ca1e534fa8e69382dc87b42ea94b") )
46 // TestNet has no checkpoints
47 static MapCheckpoints mapCheckpointsTestnet =
48 boost::assign::map_list_of
49 ( 0, std::make_pair(hashGenesisBlockTestNet, 1360105017) )
52 bool CheckHardened(int nHeight, const uint256& hash)
54 MapCheckpoints& checkpoints = (fTestNet ? mapCheckpointsTestnet : mapCheckpoints);
56 MapCheckpoints::const_iterator i = checkpoints.find(nHeight);
57 if (i == checkpoints.end()) return true;
58 return hash == i->second.first;
61 bool CheckBanned(const uint256 &nHash)
63 if (fTestNet) // Testnet has no banned blocks
65 ListBannedBlocks::const_iterator it = std::find(listBanned.begin(), listBanned.end(), nHash);
66 return it == listBanned.end();
69 int GetTotalBlocksEstimate()
71 MapCheckpoints& checkpoints = (fTestNet ? mapCheckpointsTestnet : mapCheckpoints);
73 return checkpoints.rbegin()->first;
76 unsigned int GetLastCheckpointTime()
78 MapCheckpoints& checkpoints = (fTestNet ? mapCheckpointsTestnet : mapCheckpoints);
80 return checkpoints.rbegin()->second.second;
83 CBlockIndex* GetLastCheckpoint(const std::map<uint256, CBlockIndex*>& mapBlockIndex)
85 MapCheckpoints& checkpoints = (fTestNet ? mapCheckpointsTestnet : mapCheckpoints);
87 BOOST_REVERSE_FOREACH(const MapCheckpoints::value_type& i, checkpoints)
89 const uint256& hash = i.second.first;
90 std::map<uint256, CBlockIndex*>::const_iterator t = mapBlockIndex.find(hash);
91 if (t != mapBlockIndex.end())
97 // ppcoin: synchronized checkpoint (centrally broadcasted)
98 uint256 hashSyncCheckpoint = 0;
99 uint256 hashPendingCheckpoint = 0;
100 CSyncCheckpoint checkpointMessage;
101 CSyncCheckpoint checkpointMessagePending;
102 uint256 hashInvalidCheckpoint = 0;
103 CCriticalSection cs_hashSyncCheckpoint;
105 // ppcoin: get last synchronized checkpoint
106 CBlockIndex* GetLastSyncCheckpoint()
108 LOCK(cs_hashSyncCheckpoint);
109 if (!mapBlockIndex.count(hashSyncCheckpoint))
110 error("GetSyncCheckpoint: block index missing for current sync-checkpoint %s", hashSyncCheckpoint.ToString().c_str());
112 return mapBlockIndex[hashSyncCheckpoint];
116 // ppcoin: only descendant of current sync-checkpoint is allowed
117 bool ValidateSyncCheckpoint(uint256 hashCheckpoint)
119 if (!mapBlockIndex.count(hashSyncCheckpoint))
120 return error("ValidateSyncCheckpoint: block index missing for current sync-checkpoint %s", hashSyncCheckpoint.ToString().c_str());
121 if (!mapBlockIndex.count(hashCheckpoint))
122 return error("ValidateSyncCheckpoint: block index missing for received sync-checkpoint %s", hashCheckpoint.ToString().c_str());
124 CBlockIndex* pindexSyncCheckpoint = mapBlockIndex[hashSyncCheckpoint];
125 CBlockIndex* pindexCheckpointRecv = mapBlockIndex[hashCheckpoint];
127 if (pindexCheckpointRecv->nHeight <= pindexSyncCheckpoint->nHeight)
129 // Received an older checkpoint, trace back from current checkpoint
130 // to the same height of the received checkpoint to verify
131 // that current checkpoint should be a descendant block
132 CBlockIndex* pindex = pindexSyncCheckpoint;
133 while (pindex->nHeight > pindexCheckpointRecv->nHeight)
134 if ((pindex = pindex->pprev) == NULL)
135 return error("ValidateSyncCheckpoint: pprev null - block index structure failure");
136 if (pindex->GetBlockHash() != hashCheckpoint)
138 hashInvalidCheckpoint = hashCheckpoint;
139 return error("ValidateSyncCheckpoint: new sync-checkpoint %s is conflicting with current sync-checkpoint %s", hashCheckpoint.ToString().c_str(), hashSyncCheckpoint.ToString().c_str());
141 return false; // ignore older checkpoint
144 // Received checkpoint should be a descendant block of the current
145 // checkpoint. Trace back to the same height of current checkpoint
147 CBlockIndex* pindex = pindexCheckpointRecv;
148 while (pindex->nHeight > pindexSyncCheckpoint->nHeight)
149 if ((pindex = pindex->pprev) == NULL)
150 return error("ValidateSyncCheckpoint: pprev2 null - block index structure failure");
151 if (pindex->GetBlockHash() != hashSyncCheckpoint)
153 hashInvalidCheckpoint = hashCheckpoint;
154 return error("ValidateSyncCheckpoint: new sync-checkpoint %s is not a descendant of current sync-checkpoint %s", hashCheckpoint.ToString().c_str(), hashSyncCheckpoint.ToString().c_str());
159 bool WriteSyncCheckpoint(const uint256& hashCheckpoint)
163 if (!txdb.WriteSyncCheckpoint(hashCheckpoint))
166 return error("WriteSyncCheckpoint(): failed to write to db sync checkpoint %s", hashCheckpoint.ToString().c_str());
168 if (!txdb.TxnCommit())
169 return error("WriteSyncCheckpoint(): failed to commit to db sync checkpoint %s", hashCheckpoint.ToString().c_str());
175 Checkpoints::hashSyncCheckpoint = hashCheckpoint;
179 bool AcceptPendingSyncCheckpoint()
181 LOCK(cs_hashSyncCheckpoint);
182 if (hashPendingCheckpoint != 0 && mapBlockIndex.count(hashPendingCheckpoint))
184 if (!ValidateSyncCheckpoint(hashPendingCheckpoint))
186 hashPendingCheckpoint = 0;
187 checkpointMessagePending.SetNull();
192 CBlockIndex* pindexCheckpoint = mapBlockIndex[hashPendingCheckpoint];
193 if (!pindexCheckpoint->IsInMainChain())
196 if (!block.ReadFromDisk(pindexCheckpoint))
197 return error("AcceptPendingSyncCheckpoint: ReadFromDisk failed for sync checkpoint %s", hashPendingCheckpoint.ToString().c_str());
198 if (!block.SetBestChain(txdb, pindexCheckpoint))
200 hashInvalidCheckpoint = hashPendingCheckpoint;
201 return error("AcceptPendingSyncCheckpoint: SetBestChain failed for sync checkpoint %s", hashPendingCheckpoint.ToString().c_str());
208 if (!WriteSyncCheckpoint(hashPendingCheckpoint))
209 return error("AcceptPendingSyncCheckpoint(): failed to write sync checkpoint %s", hashPendingCheckpoint.ToString().c_str());
210 hashPendingCheckpoint = 0;
211 checkpointMessage = checkpointMessagePending;
212 checkpointMessagePending.SetNull();
213 printf("AcceptPendingSyncCheckpoint : sync-checkpoint at %s\n", hashSyncCheckpoint.ToString().c_str());
214 // relay the checkpoint
215 if (!checkpointMessage.IsNull())
217 for (std::vector<CNode*>::iterator it = vNodes.begin(); it != vNodes.end(); ++it)
218 checkpointMessage.RelayTo(*it);
225 // Automatically select a suitable sync-checkpoint
226 uint256 AutoSelectSyncCheckpoint()
228 const CBlockIndex *pindex = pindexBest;
229 // Search backward for a block within max span and maturity window
230 while (pindex->pprev && (pindex->GetBlockTime() + CHECKPOINT_MAX_SPAN > pindexBest->GetBlockTime() || pindex->nHeight + 8 > pindexBest->nHeight))
231 pindex = pindex->pprev;
232 return pindex->GetBlockHash();
235 // Check against synchronized checkpoint
236 bool CheckSync(const uint256& hashBlock, const CBlockIndex* pindexPrev)
238 if (fTestNet) return true; // Testnet has no checkpoints
239 int nHeight = pindexPrev->nHeight + 1;
241 LOCK(cs_hashSyncCheckpoint);
242 // sync-checkpoint should always be accepted block
243 assert(mapBlockIndex.count(hashSyncCheckpoint));
244 const CBlockIndex* pindexSync = mapBlockIndex[hashSyncCheckpoint];
246 if (nHeight > pindexSync->nHeight)
248 // trace back to same height as sync-checkpoint
249 const CBlockIndex* pindex = pindexPrev;
250 while (pindex->nHeight > pindexSync->nHeight)
251 if ((pindex = pindex->pprev) == NULL)
252 return error("CheckSync: pprev null - block index structure failure");
253 if (pindex->nHeight < pindexSync->nHeight || pindex->GetBlockHash() != hashSyncCheckpoint)
254 return false; // only descendant of sync-checkpoint can pass check
256 if (nHeight == pindexSync->nHeight && hashBlock != hashSyncCheckpoint)
257 return false; // same height with sync-checkpoint
258 if (nHeight < pindexSync->nHeight && !mapBlockIndex.count(hashBlock))
259 return false; // lower height than sync-checkpoint
263 bool WantedByPendingSyncCheckpoint(uint256 hashBlock)
265 LOCK(cs_hashSyncCheckpoint);
266 if (hashPendingCheckpoint == 0)
268 if (hashBlock == hashPendingCheckpoint)
270 if (mapOrphanBlocks.count(hashPendingCheckpoint)
271 && hashBlock == WantedByOrphan(mapOrphanBlocks[hashPendingCheckpoint]))
276 // ppcoin: reset synchronized checkpoint to last hardened checkpoint
277 bool ResetSyncCheckpoint()
279 LOCK(cs_hashSyncCheckpoint);
280 const uint256& hash = mapCheckpoints.rbegin()->second.first;
281 if (mapBlockIndex.count(hash) && !mapBlockIndex[hash]->IsInMainChain())
283 // checkpoint block accepted but not yet in main chain
284 printf("ResetSyncCheckpoint: SetBestChain to hardened checkpoint %s\n", hash.ToString().c_str());
287 if (!block.ReadFromDisk(mapBlockIndex[hash]))
288 return error("ResetSyncCheckpoint: ReadFromDisk failed for hardened checkpoint %s", hash.ToString().c_str());
289 if (!block.SetBestChain(txdb, mapBlockIndex[hash]))
291 return error("ResetSyncCheckpoint: SetBestChain failed for hardened checkpoint %s", hash.ToString().c_str());
299 else if(!mapBlockIndex.count(hash))
301 // checkpoint block not yet accepted
302 hashPendingCheckpoint = hash;
303 checkpointMessagePending.SetNull();
304 printf("ResetSyncCheckpoint: pending for sync-checkpoint %s\n", hashPendingCheckpoint.ToString().c_str());
307 BOOST_REVERSE_FOREACH(const MapCheckpoints::value_type& i, mapCheckpoints)
309 const uint256& hash = i.second.first;
310 if (mapBlockIndex.count(hash) && mapBlockIndex[hash]->IsInMainChain())
312 if (!WriteSyncCheckpoint(hash))
313 return error("ResetSyncCheckpoint: failed to write sync checkpoint %s", hash.ToString().c_str());
314 printf("ResetSyncCheckpoint: sync-checkpoint reset to %s\n", hashSyncCheckpoint.ToString().c_str());
322 void AskForPendingSyncCheckpoint(CNode* pfrom)
324 LOCK(cs_hashSyncCheckpoint);
325 if (pfrom && hashPendingCheckpoint != 0 && (!mapBlockIndex.count(hashPendingCheckpoint)) && (!mapOrphanBlocks.count(hashPendingCheckpoint)))
326 pfrom->AskFor(CInv(MSG_BLOCK, hashPendingCheckpoint));
329 bool SetCheckpointPrivKey(std::string strPrivKey)
331 // Test signing a sync-checkpoint with genesis block
332 CSyncCheckpoint checkpoint;
333 checkpoint.hashCheckpoint = !fTestNet ? hashGenesisBlock : hashGenesisBlockTestNet;
334 CDataStream sMsg(SER_NETWORK, PROTOCOL_VERSION);
335 sMsg << (CUnsignedSyncCheckpoint)checkpoint;
336 checkpoint.vchMsg = std::vector<unsigned char>(sMsg.begin(), sMsg.end());
338 std::vector<unsigned char> vchPrivKey = ParseHex(strPrivKey);
340 key.SetPrivKey(CPrivKey(vchPrivKey.begin(), vchPrivKey.end())); // if key is not correct openssl may crash
341 if (!key.Sign(Hash(checkpoint.vchMsg.begin(), checkpoint.vchMsg.end()), checkpoint.vchSig))
344 // Test signing successful, proceed
345 CSyncCheckpoint::strMasterPrivKey = strPrivKey;
349 bool SendSyncCheckpoint(uint256 hashCheckpoint)
351 CSyncCheckpoint checkpoint;
352 checkpoint.hashCheckpoint = hashCheckpoint;
353 CDataStream sMsg(SER_NETWORK, PROTOCOL_VERSION);
354 sMsg << (CUnsignedSyncCheckpoint)checkpoint;
355 checkpoint.vchMsg = std::vector<unsigned char>(sMsg.begin(), sMsg.end());
357 if (CSyncCheckpoint::strMasterPrivKey.empty())
358 return error("SendSyncCheckpoint: Checkpoint master key unavailable.");
359 std::vector<unsigned char> vchPrivKey = ParseHex(CSyncCheckpoint::strMasterPrivKey);
361 key.SetPrivKey(CPrivKey(vchPrivKey.begin(), vchPrivKey.end())); // if key is not correct openssl may crash
362 if (!key.Sign(Hash(checkpoint.vchMsg.begin(), checkpoint.vchMsg.end()), checkpoint.vchSig))
363 return error("SendSyncCheckpoint: Unable to sign checkpoint, check private key?");
365 if(!checkpoint.ProcessSyncCheckpoint(NULL))
367 printf("WARNING: SendSyncCheckpoint: Failed to process checkpoint.\n");
374 for (std::vector<CNode*>::iterator it = vNodes.begin(); it != vNodes.end(); ++it)
375 checkpoint.RelayTo(*it);
380 // Is the sync-checkpoint outside maturity window?
381 bool IsMatureSyncCheckpoint()
383 LOCK(cs_hashSyncCheckpoint);
384 // sync-checkpoint should always be accepted block
385 assert(mapBlockIndex.count(hashSyncCheckpoint));
386 const CBlockIndex* pindexSync = mapBlockIndex[hashSyncCheckpoint];
387 return (nBestHeight >= pindexSync->nHeight + nCoinbaseMaturity ||
388 pindexSync->GetBlockTime() + nStakeMinAge < GetAdjustedTime());
392 // ppcoin: sync-checkpoint master key
393 const std::string CSyncCheckpoint::strMasterPubKey = "04a51b735f816de4ec3f891d5b38bbc91e1f7245c7c08d17990760b86b4d8fc3910a850ffecf73bfa8886f01739a0c4c4322201282d07b6e48ce931cc92af94850";
395 std::string CSyncCheckpoint::strMasterPrivKey = "";
397 // ppcoin: verify signature of sync-checkpoint message
398 bool CSyncCheckpoint::CheckSignature()
400 CPubKey key(ParseHex(CSyncCheckpoint::strMasterPubKey));
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());