uint256 hashSyncCheckpoint;
CSyncCheckpoint checkpointMessage;
CSyncCheckpoint checkpointMessagePending;
+ uint256 hashInvalidCheckpoint = 0;
CCriticalSection cs_hashSyncCheckpoint;
- bool CSyncCheckpoint::ProcessSyncCheckpoint(CNode* pfrom)
+ // ppcoin: only descendant of current sync-checkpoint is allowed
+ bool ValidateSyncCheckpoint(uint256 hashCheckpoint)
{
- if (!CheckSignature())
- return false;
+ 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 AcceptPendingSyncCheckpoint()
+ {
CRITICAL_BLOCK(cs_hashSyncCheckpoint)
{
- if (!mapBlockIndex.count(hashCheckpoint))
+ if ((!checkpointMessagePending.IsNull()) && mapBlockIndex.count(checkpointMessagePending.hashCheckpoint))
{
- // We haven't accepted this block, keep the checkpoint as pending
- checkpointMessagePending = *this;
- // Ask this guy to fill in what we're missing
- if (pfrom)
- pfrom->PushGetBlocks(pindexBest, hashCheckpoint);
- return false;
+ if (!ValidateSyncCheckpoint(checkpointMessagePending.hashCheckpoint))
+ {
+ checkpointMessagePending.SetNull();
+ return false;
+ }
+
+ CTxDB txdb;
+ CBlockIndex* pindexCheckpoint = mapBlockIndex[checkpointMessagePending.hashCheckpoint];
+ if (!pindexCheckpoint->IsInMainChain())
+ {
+ txdb.TxnBegin();
+ if (!Reorganize(txdb, pindexCheckpoint))
+ {
+ txdb.TxnAbort();
+ hashInvalidCheckpoint = checkpointMessagePending.hashCheckpoint;
+ return error("ProcessSyncCheckpoint: Reorganize failed for sync checkpoint %s", checkpointMessagePending.hashCheckpoint.ToString().c_str());
+ }
+ }
+
+ txdb.TxnBegin();
+ if (!txdb.WriteSyncCheckpoint(checkpointMessagePending.hashCheckpoint))
+ {
+ txdb.TxnAbort();
+ return error("AcceptPendingSyncCheckpoint() : failed to write to db sync checkpoint %s\n", checkpointMessagePending.hashCheckpoint.ToString().c_str());
+ }
+ if (!txdb.TxnCommit())
+ return error("AcceptPendingSyncCheckpoint() : failed to commit to db sync checkpoint %s\n", checkpointMessagePending.hashCheckpoint.ToString().c_str());
+ txdb.Close();
+
+ hashSyncCheckpoint = checkpointMessagePending.hashCheckpoint;
+ checkpointMessage = checkpointMessagePending;
+ checkpointMessagePending.SetNull();
+ printf("AcceptPendingSyncCheckpoint : sync-checkpoint at %s\n", hashSyncCheckpoint.ToString().c_str());
+ // relay the checkpoint
+ CRITICAL_BLOCK(cs_hashSyncCheckpoint)
+ BOOST_FOREACH(CNode* pnode, vNodes)
+ checkpointMessage.RelayTo(pnode);
+ return true;
}
+ }
+
+ return false;
+ }
- if (!mapBlockIndex.count(hashSyncCheckpoint))
- return error("ProcessSyncCheckpoint: block index missing for synchronized checkpoint %s", hashSyncCheckpoint.ToString().c_str());
+ uint256 AutoSelectSyncCheckpoint()
+ {
+ // select block roughly 8 hours ago
+ CBlockIndex *pindex = mapBlockIndex[hashSyncCheckpoint];
+ while (pindex->pnext && pindex->pnext->GetBlockTime() + AUTO_CHECKPOINT_MIN_SPAN <= GetAdjustedTime())
+ pindex = pindex->pnext;
+ return pindex->GetBlockHash();
+ }
- CBlockIndex* pindexSyncCheckpoint = mapBlockIndex[hashSyncCheckpoint];
- CBlockIndex* pindexCheckpointPending = mapBlockIndex[hashCheckpoint];
- if (pindexCheckpointPending->nHeight <= pindexSyncCheckpoint->nHeight)
- return false; // this is an older checkpoint, ignore
+ // Check against synchronized checkpoint
+ bool CheckSync(const uint256& hashBlock, const CBlockIndex* pindexPrev)
+ {
+ if (fTestNet) return true; // Testnet has no checkpoints
+ int nHeight = pindexPrev->nHeight + 1;
- CBlockIndex* pindex = pindexCheckpointPending;
- while (pindex->nHeight > pindexSyncCheckpoint->nHeight)
- pindex = pindex->pprev;
- if (pindex->GetBlockHash() != hashSyncCheckpoint)
- return error("ProcessSyncCheckpoint: new sync-checkpoint %s is not a descendant of current sync-checkpoint %s", hashCheckpoint.ToString().c_str(), hashSyncCheckpoint.ToString().c_str());
- hashSyncCheckpoint = this->hashCheckpoint;
- checkpointMessage = *this;
+ CRITICAL_BLOCK(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 IsPendingSyncCheckpoint(uint256 hashBlock)
+ {
+ CRITICAL_BLOCK(cs_hashSyncCheckpoint)
+ return ((!checkpointMessagePending.IsNull()) && hashBlock == checkpointMessagePending.hashCheckpoint);
+ }
+
// ppcoin: automatic checkpoint (represented by height of checkpoint)
int nAutoCheckpoint = 0;
int nBranchPoint = 0; // branch point to alternative branch
return true;
}
}
+
+// ppcoin: process synchronized checkpoint
+bool CSyncCheckpoint::ProcessSyncCheckpoint(CNode* pfrom)
+{
+ if (!CheckSignature())
+ return false;
+
+ CRITICAL_BLOCK(Checkpoints::cs_hashSyncCheckpoint)
+ {
+ if (!mapBlockIndex.count(hashCheckpoint))
+ {
+ // We haven't received the checkpoint chain, keep the checkpoint as pending
+ 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)? GetOrphanRoot(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.TxnBegin();
+ if (!txdb.WriteSyncCheckpoint(hashCheckpoint))
+ {
+ txdb.TxnAbort();
+ return error("ProcessSyncCheckpoint(): failed to write to db sync checkpoint %s", hashCheckpoint.ToString().c_str());
+ }
+ if (!txdb.TxnCommit())
+ return error("ProcessSyncCheckpoint(): failed to commit to db sync checkpoint %s", hashCheckpoint.ToString().c_str());
+ txdb.Close();
+
+ Checkpoints::hashSyncCheckpoint = hashCheckpoint;
+ Checkpoints::checkpointMessage = *this;
+ Checkpoints::checkpointMessagePending.SetNull();
+ printf("ProcessSyncCheckpoint: sync-checkpoint at %s\n", hashCheckpoint.ToString().c_str());
+ }
+ return true;
+}
git://git.novaco.in / novacoin.git / blobdiff