From 9be0e6837b878f72bd087ce32b7a2f2ffb2fd544 Mon Sep 17 00:00:00 2001 From: Suhas Daftuar Date: Thu, 9 Apr 2015 13:21:11 -0400 Subject: [PATCH] Be stricter in processing unrequested blocks AcceptBlock will no longer process an unrequested block, unless it has not been previously processed and has more work than chainActive.Tip() --- src/main.cpp | 40 +++++++++++++++++++++++++--------------- src/main.h | 7 ++++--- src/miner.cpp | 2 +- src/rpcmining.cpp | 4 ++-- src/test/miner_tests.cpp | 2 +- 5 files changed, 33 insertions(+), 22 deletions(-) diff --git a/src/main.cpp b/src/main.cpp index efb7fb3f87..760cda5dee 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::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. @@ -2826,7 +2829,7 @@ 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 +2839,18 @@ 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 +2899,22 @@ 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(); } @@ -3453,7 +3462,7 @@ 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 +3484,7 @@ 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()); @@ -4462,7 +4471,8 @@ 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(), diff --git a/src/main.h b/src/main.h index 3b25217869..669ea7128a 100644 --- a/src/main.h +++ b/src/main.h @@ -153,10 +153,11 @@ void UnregisterNodeSignals(CNodeSignals& nodeSignals); * @param[out] state This may be set to an Error state if any error occurred processing it, including during validation/connection/etc of otherwise unrelated blocks during reorganisation; or it may be set to an Invalid state if pblock is itself invalid (but this is not guaranteed even when the block is checked). If you want to *possibly* get feedback on whether pblock is valid, you must also install a CValidationInterface (see validationinterface.h) - this will have its BlockChecked method called whenever *any* block completes validation. * @param[in] pfrom The node which we are receiving the block from; it is added to mapBlockSource and may be penalised if the block is invalid. * @param[in] pblock The block we want to process. + * @param[in] fForceProcessing Process this block even if unrequested; used for non-network block sources and whitelisted peers. * @param[out] dbp If pblock is stored to disk (or already there), this will be set to its location. * @return True if state.IsValid() */ -bool ProcessNewBlock(CValidationState &state, CNode* pfrom, CBlock* pblock, CDiskBlockPos *dbp = NULL); +bool ProcessNewBlock(CValidationState &state, CNode* pfrom, CBlock* pblock, bool fForceProcessing, CDiskBlockPos *dbp); /** Check whether enough disk space is available for an incoming block */ bool CheckDiskSpace(uint64_t nAdditionalBytes = 0); /** Open a block file (blk?????.dat) */ @@ -400,8 +401,8 @@ bool ContextualCheckBlock(const CBlock& block, CValidationState& state, CBlockIn /** Check a block is completely valid from start to finish (only works on top of our current best block, with cs_main held) */ bool TestBlockValidity(CValidationState &state, const CBlock& block, CBlockIndex *pindexPrev, bool fCheckPOW = true, bool fCheckMerkleRoot = true); -/** Store block on disk. If dbp is provided, the file is known to already reside on disk */ -bool AcceptBlock(CBlock& block, CValidationState& state, CBlockIndex **pindex, CDiskBlockPos* dbp = NULL); +/** Store block on disk. If dbp is non-NULL, the file is known to already reside on disk */ +bool AcceptBlock(CBlock& block, CValidationState& state, CBlockIndex **pindex, bool fRequested, CDiskBlockPos* dbp); bool AcceptBlockHeader(const CBlockHeader& block, CValidationState& state, CBlockIndex **ppindex= NULL); diff --git a/src/miner.cpp b/src/miner.cpp index dfabfd48d0..f5919ca3af 100644 --- a/src/miner.cpp +++ b/src/miner.cpp @@ -434,7 +434,7 @@ static bool ProcessBlockFound(CBlock* pblock, CWallet& wallet, CReserveKey& rese // Process this block the same as if we had received it from another node CValidationState state; - if (!ProcessNewBlock(state, NULL, pblock)) + if (!ProcessNewBlock(state, NULL, pblock, true, NULL)) return error("BitcoinMiner: ProcessNewBlock, block not accepted"); return true; diff --git a/src/rpcmining.cpp b/src/rpcmining.cpp index d58d438573..528d5406f4 100644 --- a/src/rpcmining.cpp +++ b/src/rpcmining.cpp @@ -164,7 +164,7 @@ Value generate(const Array& params, bool fHelp) ++pblock->nNonce; } CValidationState state; - if (!ProcessNewBlock(state, NULL, pblock)) + if (!ProcessNewBlock(state, NULL, pblock, true, NULL)) throw JSONRPCError(RPC_INTERNAL_ERROR, "ProcessNewBlock, block not accepted"); ++nHeight; blockHashes.push_back(pblock->GetHash().GetHex()); @@ -650,7 +650,7 @@ Value submitblock(const Array& params, bool fHelp) CValidationState state; submitblock_StateCatcher sc(block.GetHash()); RegisterValidationInterface(&sc); - bool fAccepted = ProcessNewBlock(state, NULL, &block); + bool fAccepted = ProcessNewBlock(state, NULL, &block, true, NULL); UnregisterValidationInterface(&sc); if (fBlockPresent) { diff --git a/src/test/miner_tests.cpp b/src/test/miner_tests.cpp index e3e9061cce..9e4fd8513e 100644 --- a/src/test/miner_tests.cpp +++ b/src/test/miner_tests.cpp @@ -84,7 +84,7 @@ BOOST_AUTO_TEST_CASE(CreateNewBlock_validity) pblock->hashMerkleRoot = pblock->BuildMerkleTree(); pblock->nNonce = blockinfo[i].nonce; CValidationState state; - BOOST_CHECK(ProcessNewBlock(state, NULL, pblock)); + BOOST_CHECK(ProcessNewBlock(state, NULL, pblock, true, NULL)); BOOST_CHECK(state.IsValid()); pblock->hashPrevBlock = pblock->GetHash(); }