diff options
Diffstat (limited to 'src/main.cpp')
| -rw-r--r-- | src/main.cpp | 132 |
1 files changed, 80 insertions, 52 deletions
diff --git a/src/main.cpp b/src/main.cpp index 03a4082bba..69c972a79f 100644 --- a/src/main.cpp +++ b/src/main.cpp @@ -296,7 +296,8 @@ void FinalizeNode(NodeId nodeid) { } // Requires cs_main. -void MarkBlockAsReceived(const uint256& hash) { +// Returns a bool indicating whether we requested this block. +bool MarkBlockAsReceived(const uint256& hash) { map<uint256, pair<NodeId, list<QueuedBlock>::iterator> >::iterator itInFlight = mapBlocksInFlight.find(hash); if (itInFlight != mapBlocksInFlight.end()) { CNodeState *state = State(itInFlight->second.first); @@ -306,7 +307,9 @@ void MarkBlockAsReceived(const uint256& hash) { state->nBlocksInFlight--; state->nStallingSince = 0; mapBlocksInFlight.erase(itInFlight); + return true; } + return false; } // Requires cs_main. @@ -690,7 +693,7 @@ bool CheckFinalTx(const CTransaction &tx) /** * Check transaction inputs to mitigate two * potential denial-of-service attacks: - * + * * 1. scriptSigs with extra data stuffed into them, * not consumed by scriptPubKey (or P2SH script) * 2. P2SH scripts with a crazy number of expensive @@ -1392,22 +1395,21 @@ bool CScriptCheck::operator()() { return true; } -bool CheckInputs(const CTransaction& tx, CValidationState &state, const CCoinsViewCache &inputs, bool fScriptChecks, unsigned int flags, bool cacheStore, std::vector<CScriptCheck> *pvChecks) +int GetSpendHeight(const CCoinsViewCache& inputs) { - if (!tx.IsCoinBase()) - { - if (pvChecks) - pvChecks->reserve(tx.vin.size()); + LOCK(cs_main); + CBlockIndex* pindexPrev = mapBlockIndex.find(inputs.GetBestBlock())->second; + return pindexPrev->nHeight + 1; +} +namespace Consensus { +bool CheckTxInputs(const CTransaction& tx, CValidationState& state, const CCoinsViewCache& inputs, int nSpendHeight) +{ // This doesn't trigger the DoS code on purpose; if it did, it would make it easier // for an attacker to attempt to split the network. if (!inputs.HaveInputs(tx)) return state.Invalid(error("CheckInputs(): %s inputs unavailable", tx.GetHash().ToString())); - // While checking, GetBestBlock() refers to the parent block. - // This is also true for mempool checks. - CBlockIndex *pindexPrev = mapBlockIndex.find(inputs.GetBestBlock())->second; - int nSpendHeight = pindexPrev->nHeight + 1; CAmount nValueIn = 0; CAmount nFees = 0; for (unsigned int i = 0; i < tx.vin.size(); i++) @@ -1446,6 +1448,19 @@ bool CheckInputs(const CTransaction& tx, CValidationState &state, const CCoinsVi if (!MoneyRange(nFees)) return state.DoS(100, error("CheckInputs(): nFees out of range"), REJECT_INVALID, "bad-txns-fee-outofrange"); + return true; +} +}// namespace Consensus + +bool CheckInputs(const CTransaction& tx, CValidationState &state, const CCoinsViewCache &inputs, bool fScriptChecks, unsigned int flags, bool cacheStore, std::vector<CScriptCheck> *pvChecks) +{ + if (!tx.IsCoinBase()) + { + if (!Consensus::CheckTxInputs(tx, state, inputs, GetSpendHeight(inputs))) + return false; + + if (pvChecks) + pvChecks->reserve(tx.vin.size()); // The first loop above does all the inexpensive checks. // Only if ALL inputs pass do we perform expensive ECDSA signature checks. @@ -1787,7 +1802,14 @@ bool ConnectBlock(const CBlock& block, CValidationState& state, CBlockIndex* pin return true; } - bool fScriptChecks = (!fCheckpointsEnabled || pindex->nHeight >= Checkpoints::GetTotalBlocksEstimate(chainparams.Checkpoints())); + bool fScriptChecks = true; + if (fCheckpointsEnabled) { + CBlockIndex *pindexLastCheckpoint = Checkpoints::GetLastCheckpoint(chainparams.Checkpoints()); + if (pindexLastCheckpoint && pindexLastCheckpoint->GetAncestor(pindex->nHeight) == pindex) { + // This block is an ancestor of a checkpoint: disable script checks + fScriptChecks = false; + } + } // Do not allow blocks that contain transactions which 'overwrite' older transactions, // unless those are already completely spent. @@ -2145,7 +2167,7 @@ static int64_t nTimeFlush = 0; static int64_t nTimeChainState = 0; static int64_t nTimePostConnect = 0; -/** +/** * Connect a new block to chainActive. pblock is either NULL or a pointer to a CBlock * corresponding to pindexNew, to bypass loading it again from disk. */ @@ -2709,18 +2731,23 @@ bool CheckBlock(const CBlock& block, CValidationState& state, bool fCheckPOW, bo return true; } -bool ContextualCheckBlockHeader(const CBlockHeader& block, CValidationState& state, CBlockIndex * const pindexPrev) +static bool CheckIndexAgainstCheckpoint(const CBlockIndex* pindexPrev, CValidationState& state, const CChainParams& chainparams, const uint256& hash) { - const CChainParams& chainParams = Params(); - const Consensus::Params& consensusParams = chainParams.GetConsensus(); - uint256 hash = block.GetHash(); - if (hash == consensusParams.hashGenesisBlock) + if (*pindexPrev->phashBlock == chainparams.GetConsensus().hashGenesisBlock) return true; - assert(pindexPrev); - int nHeight = pindexPrev->nHeight+1; + // Don't accept any forks from the main chain prior to last checkpoint + CBlockIndex* pcheckpoint = Checkpoints::GetLastCheckpoint(chainparams.Checkpoints()); + if (pcheckpoint && nHeight < pcheckpoint->nHeight) + return state.DoS(100, error("%s: forked chain older than last checkpoint (height %d)", __func__, nHeight)); + return true; +} + +bool ContextualCheckBlockHeader(const CBlockHeader& block, CValidationState& state, CBlockIndex * const pindexPrev) +{ + const Consensus::Params& consensusParams = Params().GetConsensus(); // Check proof of work if (block.nBits != GetNextWorkRequired(pindexPrev, &block, consensusParams)) return state.DoS(100, error("%s: incorrect proof of work", __func__), @@ -2731,19 +2758,6 @@ bool ContextualCheckBlockHeader(const CBlockHeader& block, CValidationState& sta return state.Invalid(error("%s: block's timestamp is too early", __func__), REJECT_INVALID, "time-too-old"); - if(fCheckpointsEnabled) - { - // Check that the block chain matches the known block chain up to a checkpoint - if (!Checkpoints::CheckBlock(chainParams.Checkpoints(), nHeight, hash)) - return state.DoS(100, error("%s: rejected by checkpoint lock-in at %d", __func__, nHeight), - REJECT_CHECKPOINT, "checkpoint mismatch"); - - // Don't accept any forks from the main chain prior to last checkpoint - CBlockIndex* pcheckpoint = Checkpoints::GetLastCheckpoint(chainParams.Checkpoints()); - if (pcheckpoint && nHeight < pcheckpoint->nHeight) - return state.DoS(100, error("%s: forked chain older than last checkpoint (height %d)", __func__, nHeight)); - } - // Reject block.nVersion=1 blocks when 95% (75% on testnet) of the network has upgraded: if (block.nVersion < 2 && IsSuperMajority(2, pindexPrev, consensusParams.nMajorityRejectBlockOutdated, consensusParams)) return state.Invalid(error("%s: rejected nVersion=1 block", __func__), @@ -2813,6 +2827,9 @@ bool AcceptBlockHeader(const CBlockHeader& block, CValidationState& state, CBloc if (pindexPrev->nStatus & BLOCK_FAILED_MASK) return state.DoS(100, error("%s: prev block invalid", __func__), REJECT_INVALID, "bad-prevblk"); } + assert(pindexPrev); + if (fCheckpointsEnabled && !CheckIndexAgainstCheckpoint(pindexPrev, state, chainparams, hash)) + return error("%s: CheckIndexAgainstCheckpoint(): %s", __func__, state.GetRejectReason().c_str()); if (!ContextualCheckBlockHeader(block, state, pindexPrev)) return false; @@ -2826,7 +2843,7 @@ bool AcceptBlockHeader(const CBlockHeader& block, CValidationState& state, CBloc return true; } -bool AcceptBlock(CBlock& block, CValidationState& state, CBlockIndex** ppindex, CDiskBlockPos* dbp) +bool AcceptBlock(CBlock& block, CValidationState& state, CBlockIndex** ppindex, bool fRequested, CDiskBlockPos* dbp) { const CChainParams& chainparams = Params(); AssertLockHeld(cs_main); @@ -2836,13 +2853,18 @@ bool AcceptBlock(CBlock& block, CValidationState& state, CBlockIndex** ppindex, if (!AcceptBlockHeader(block, state, &pindex)) return false; - // If we're pruning, ensure that we don't allow a peer to dump a copy - // of old blocks. But we might need blocks that are not on the main chain - // to handle a reorg, even if we've processed once. - if (pindex->nStatus & BLOCK_HAVE_DATA || chainActive.Contains(pindex)) { - // TODO: deal better with duplicate blocks. - // return state.DoS(20, error("AcceptBlock(): already have block %d %s", pindex->nHeight, pindex->GetBlockHash().ToString()), REJECT_DUPLICATE, "duplicate"); - return true; + // Try to process all requested blocks that we don't have, but only + // process an unrequested block if it's new and has enough work to + // advance our tip. + bool fAlreadyHave = pindex->nStatus & BLOCK_HAVE_DATA; + bool fHasMoreWork = (chainActive.Tip() ? pindex->nChainWork > chainActive.Tip()->nChainWork : true); + + // TODO: deal better with return value and error conditions for duplicate + // and unrequested blocks. + if (fAlreadyHave) return true; + if (!fRequested) { // If we didn't ask for it: + if (pindex->nTx != 0) return true; // This is a previously-processed block that was pruned + if (!fHasMoreWork) return true; // Don't process less-work chains } if ((!CheckBlock(block, state)) || !ContextualCheckBlock(block, state, pindex->pprev)) { @@ -2891,21 +2913,22 @@ static bool IsSuperMajority(int minVersion, const CBlockIndex* pstart, unsigned } -bool ProcessNewBlock(CValidationState &state, CNode* pfrom, CBlock* pblock, CDiskBlockPos *dbp) +bool ProcessNewBlock(CValidationState &state, CNode* pfrom, CBlock* pblock, bool fForceProcessing, CDiskBlockPos *dbp) { // Preliminary checks bool checked = CheckBlock(*pblock, state); { LOCK(cs_main); - MarkBlockAsReceived(pblock->GetHash()); + bool fRequested = MarkBlockAsReceived(pblock->GetHash()); + fRequested |= fForceProcessing; if (!checked) { return error("%s: CheckBlock FAILED", __func__); } // Store to disk CBlockIndex *pindex = NULL; - bool ret = AcceptBlock(*pblock, state, &pindex, dbp); + bool ret = AcceptBlock(*pblock, state, &pindex, fRequested, dbp); if (pindex && pfrom) { mapBlockSource[pindex->GetBlockHash()] = pfrom->GetId(); } @@ -2922,8 +2945,11 @@ bool ProcessNewBlock(CValidationState &state, CNode* pfrom, CBlock* pblock, CDis bool TestBlockValidity(CValidationState &state, const CBlock& block, CBlockIndex * const pindexPrev, bool fCheckPOW, bool fCheckMerkleRoot) { + const CChainParams& chainparams = Params(); AssertLockHeld(cs_main); - assert(pindexPrev == chainActive.Tip()); + assert(pindexPrev && pindexPrev == chainActive.Tip()); + if (fCheckpointsEnabled && !CheckIndexAgainstCheckpoint(pindexPrev, state, chainparams, block.GetHash())) + return error("%s: CheckIndexAgainstCheckpoint(): %s", __func__, state.GetRejectReason().c_str()); CCoinsViewCache viewNew(pcoinsTip); CBlockIndex indexDummy(block); @@ -3453,7 +3479,7 @@ bool LoadExternalBlockFile(FILE* fileIn, CDiskBlockPos *dbp) // process in case the block isn't known yet if (mapBlockIndex.count(hash) == 0 || (mapBlockIndex[hash]->nStatus & BLOCK_HAVE_DATA) == 0) { CValidationState state; - if (ProcessNewBlock(state, NULL, &block, dbp)) + if (ProcessNewBlock(state, NULL, &block, true, dbp)) nLoaded++; if (state.IsError()) break; @@ -3475,7 +3501,7 @@ bool LoadExternalBlockFile(FILE* fileIn, CDiskBlockPos *dbp) LogPrintf("%s: Processing out of order child %s of %s\n", __func__, block.GetHash().ToString(), head.ToString()); CValidationState dummy; - if (ProcessNewBlock(dummy, NULL, &block, &it->second)) + if (ProcessNewBlock(dummy, NULL, &block, true, &it->second)) { nLoaded++; queue.push_back(block.GetHash()); @@ -3687,7 +3713,7 @@ void static CheckBlockIndex() // CAlert // -string GetWarnings(string strFor) +std::string GetWarnings(const std::string& strFor) { int nPriority = 0; string strStatusBar; @@ -4311,7 +4337,6 @@ bool static ProcessMessage(CNode* pfrom, string strCommand, CDataStream& vRecv, mempool.check(pcoinsTip); RelayTransaction(tx); vWorkQueue.push_back(inv.hash); - vEraseQueue.push_back(inv.hash); LogPrint("mempool", "AcceptToMemoryPool: peer=%d %s: accepted %s (poolsz %u)\n", pfrom->id, pfrom->cleanSubVer, @@ -4338,7 +4363,6 @@ bool static ProcessMessage(CNode* pfrom, string strCommand, CDataStream& vRecv, // anyone relaying LegitTxX banned) CValidationState stateDummy; - vEraseQueue.push_back(orphanHash); if (setMisbehaving.count(fromPeer)) continue; @@ -4347,6 +4371,7 @@ bool static ProcessMessage(CNode* pfrom, string strCommand, CDataStream& vRecv, LogPrint("mempool", " accepted orphan tx %s\n", orphanHash.ToString()); RelayTransaction(orphanTx); vWorkQueue.push_back(orphanHash); + vEraseQueue.push_back(orphanHash); } else if (!fMissingInputs2) { @@ -4358,8 +4383,10 @@ bool static ProcessMessage(CNode* pfrom, string strCommand, CDataStream& vRecv, setMisbehaving.insert(fromPeer); LogPrint("mempool", " invalid orphan tx %s\n", orphanHash.ToString()); } - // too-little-fee orphan + // Has inputs but not accepted to mempool + // Probably non-standard or insufficient fee/priority LogPrint("mempool", " removed orphan tx %s\n", orphanHash.ToString()); + vEraseQueue.push_back(orphanHash); } mempool.check(pcoinsTip); } @@ -4462,7 +4489,8 @@ bool static ProcessMessage(CNode* pfrom, string strCommand, CDataStream& vRecv, pfrom->AddInventoryKnown(inv); CValidationState state; - ProcessNewBlock(state, pfrom, &block); + // Process all blocks from whitelisted peers, even if not requested. + ProcessNewBlock(state, pfrom, &block, pfrom->fWhitelisted, NULL); int nDoS; if (state.IsInvalid(nDoS)) { pfrom->PushMessage("reject", strCommand, state.GetRejectCode(), |