From 88c35491ab19f9afdf9b3fa9356a072f70ef2f55 Mon Sep 17 00:00:00 2001 From: Suhas Daftuar Date: Mon, 31 Oct 2016 10:03:49 -0400 Subject: Fix compact block handling to not ban if block is invalid --- src/blockencodings.cpp | 2 +- src/blockencodings.h | 2 ++ src/main.cpp | 46 ++++++++++++++++++++++++++++++++-------------- src/main.h | 2 +- src/rpc/mining.cpp | 4 ++-- src/test/miner_tests.cpp | 2 +- src/test/test_bitcoin.cpp | 2 +- 7 files changed, 40 insertions(+), 20 deletions(-) (limited to 'src') diff --git a/src/blockencodings.cpp b/src/blockencodings.cpp index 93d3fa372..737102f16 100644 --- a/src/blockencodings.cpp +++ b/src/blockencodings.cpp @@ -167,7 +167,7 @@ ReadStatus PartiallyDownloadedBlock::FillBlock(CBlock& block, const std::vector< // check its own merkle root and cache that check. if (state.CorruptionPossible()) return READ_STATUS_FAILED; // Possible Short ID collision - return READ_STATUS_INVALID; + return READ_STATUS_CHECKBLOCK_FAILED; } LogPrint("cmpctblock", "Successfully reconstructed block %s with %lu txn prefilled, %lu txn from mempool and %lu txn requested\n", header.GetHash().ToString(), prefilled_count, mempool_count, vtx_missing.size()); diff --git a/src/blockencodings.h b/src/blockencodings.h index 99b1cb140..705eaf28a 100644 --- a/src/blockencodings.h +++ b/src/blockencodings.h @@ -124,6 +124,8 @@ typedef enum ReadStatus_t READ_STATUS_OK, READ_STATUS_INVALID, // Invalid object, peer is sending bogus crap READ_STATUS_FAILED, // Failed to process object + READ_STATUS_CHECKBLOCK_FAILED, // Used only by FillBlock to indicate a + // failure in CheckBlock. } ReadStatus; class CBlockHeaderAndShortTxIDs { diff --git a/src/main.cpp b/src/main.cpp index 3f706b150..b65b9874e 100644 --- a/src/main.cpp +++ b/src/main.cpp @@ -179,8 +179,10 @@ namespace { * Sources of received blocks, saved to be able to send them reject * messages or ban them when processing happens afterwards. Protected by * cs_main. + * Set mapBlockSource[hash].second to false if the node should not be + * punished if the block is invalid. */ - map mapBlockSource; + map> mapBlockSource; /** * Filter for transactions that were recently rejected by @@ -3759,7 +3761,7 @@ static bool AcceptBlock(const CBlock& block, CValidationState& state, const CCha return true; } -bool ProcessNewBlock(CValidationState& state, const CChainParams& chainparams, CNode* pfrom, const CBlock* pblock, bool fForceProcessing, const CDiskBlockPos* dbp) +bool ProcessNewBlock(CValidationState& state, const CChainParams& chainparams, CNode* pfrom, const CBlock* pblock, bool fForceProcessing, const CDiskBlockPos* dbp, bool fMayBanPeerIfInvalid) { { LOCK(cs_main); @@ -3769,7 +3771,7 @@ bool ProcessNewBlock(CValidationState& state, const CChainParams& chainparams, C bool fNewBlock = false; bool ret = AcceptBlock(*pblock, state, chainparams, &pindex, fForceProcessing, dbp, &fNewBlock); if (pindex && pfrom) { - mapBlockSource[pindex->GetBlockHash()] = pfrom->GetId(); + mapBlockSource[pindex->GetBlockHash()] = std::make_pair(pfrom->GetId(), fMayBanPeerIfInvalid); if (fNewBlock) pfrom->nLastBlockTime = GetTime(); } CheckBlockIndex(chainparams.GetConsensus()); @@ -4749,16 +4751,16 @@ void PeerLogicValidation::BlockChecked(const CBlock& block, const CValidationSta LOCK(cs_main); const uint256 hash(block.GetHash()); - std::map::iterator it = mapBlockSource.find(hash); + std::map>::iterator it = mapBlockSource.find(hash); int nDoS = 0; if (state.IsInvalid(nDoS)) { - if (it != mapBlockSource.end() && State(it->second)) { + if (it != mapBlockSource.end() && State(it->second.first)) { assert (state.GetRejectCode() < REJECT_INTERNAL); // Blocks are never rejected with internal reject codes CBlockReject reject = {(unsigned char)state.GetRejectCode(), state.GetRejectReason().substr(0, MAX_REJECT_MESSAGE_LENGTH), hash}; - State(it->second)->rejects.push_back(reject); - if (nDoS > 0) - Misbehaving(it->second, nDoS); + State(it->second.first)->rejects.push_back(reject); + if (nDoS > 0 && it->second.second) + Misbehaving(it->second.first, nDoS); } } if (it != mapBlockSource.end()) @@ -5868,6 +5870,23 @@ bool static ProcessMessage(CNode* pfrom, string strCommand, CDataStream& vRecv, invs.push_back(CInv(MSG_BLOCK | GetFetchFlags(pfrom, chainActive.Tip(), chainparams.GetConsensus()), resp.blockhash)); pfrom->PushMessage(NetMsgType::GETDATA, invs); } else { + // Block is either okay, or possibly we received + // READ_STATUS_CHECKBLOCK_FAILED. + // Note that CheckBlock can only fail for one of a few reasons: + // 1. bad-proof-of-work (impossible here, because we've already + // accepted the header) + // 2. merkleroot doesn't match the transactions given (already + // caught in FillBlock with READ_STATUS_FAILED, so + // impossible here) + // 3. the block is otherwise invalid (eg invalid coinbase, + // block is too big, too many legacy sigops, etc). + // So if CheckBlock failed, #3 is the only possibility. + // Under BIP 152, we don't DoS-ban unless proof of work is + // invalid (we don't require all the stateless checks to have + // been run). This is handled below, so just treat this as + // though the block was successfully read, and rely on the + // handling in ProcessNewBlock to ensure the block index is + // updated, reject messages go out, etc. MarkBlockAsReceived(resp.blockhash); // it is now an empty pointer fBlockRead = true; } @@ -5876,16 +5895,15 @@ bool static ProcessMessage(CNode* pfrom, string strCommand, CDataStream& vRecv, CValidationState state; // Since we requested this block (it was in mapBlocksInFlight), force it to be processed, // even if it would not be a candidate for new tip (missing previous block, chain not long enough, etc) - ProcessNewBlock(state, chainparams, pfrom, &block, true, NULL); + // BIP 152 permits peers to relay compact blocks after validating + // the header only; we should not punish peers if the block turns + // out to be invalid. + ProcessNewBlock(state, chainparams, pfrom, &block, true, NULL, false); int nDoS; if (state.IsInvalid(nDoS)) { assert (state.GetRejectCode() < REJECT_INTERNAL); // Blocks are never rejected with internal reject codes pfrom->PushMessage(NetMsgType::REJECT, strCommand, (unsigned char)state.GetRejectCode(), state.GetRejectReason().substr(0, MAX_REJECT_MESSAGE_LENGTH), block.GetHash()); - if (nDoS > 0) { - LOCK(cs_main); - Misbehaving(pfrom->GetId(), nDoS); - } } } } @@ -6056,7 +6074,7 @@ bool static ProcessMessage(CNode* pfrom, string strCommand, CDataStream& vRecv, // need it even though it is not a candidate for a new best tip. forceProcessing |= MarkBlockAsReceived(block.GetHash()); } - ProcessNewBlock(state, chainparams, pfrom, &block, forceProcessing, NULL); + ProcessNewBlock(state, chainparams, pfrom, &block, forceProcessing, NULL, true); int nDoS; if (state.IsInvalid(nDoS)) { assert (state.GetRejectCode() < REJECT_INTERNAL); // Blocks are never rejected with internal reject codes diff --git a/src/main.h b/src/main.h index e80314a64..934333058 100644 --- a/src/main.h +++ b/src/main.h @@ -223,7 +223,7 @@ static const uint64_t MIN_DISK_SPACE_FOR_BLOCK_FILES = 550 * 1024 * 1024; * @param[out] dbp The already known disk position of pblock, or NULL if not yet stored. * @return True if state.IsValid() */ -bool ProcessNewBlock(CValidationState& state, const CChainParams& chainparams, CNode* pfrom, const CBlock* pblock, bool fForceProcessing, const CDiskBlockPos* dbp); +bool ProcessNewBlock(CValidationState& state, const CChainParams& chainparams, CNode* pfrom, const CBlock* pblock, bool fForceProcessing, const CDiskBlockPos* dbp, bool fMayBanPeerIfInvalid); /** Check whether enough disk space is available for an incoming block */ bool CheckDiskSpace(uint64_t nAdditionalBytes = 0); /** Open a block file (blk?????.dat) */ diff --git a/src/rpc/mining.cpp b/src/rpc/mining.cpp index be0776ea2..564102ff9 100644 --- a/src/rpc/mining.cpp +++ b/src/rpc/mining.cpp @@ -132,7 +132,7 @@ UniValue generateBlocks(boost::shared_ptr coinbaseScript, int nG continue; } CValidationState state; - if (!ProcessNewBlock(state, Params(), NULL, pblock, true, NULL)) + if (!ProcessNewBlock(state, Params(), NULL, pblock, true, NULL, false)) throw JSONRPCError(RPC_INTERNAL_ERROR, "ProcessNewBlock, block not accepted"); ++nHeight; blockHashes.push_back(pblock->GetHash().GetHex()); @@ -757,7 +757,7 @@ UniValue submitblock(const JSONRPCRequest& request) CValidationState state; submitblock_StateCatcher sc(block.GetHash()); RegisterValidationInterface(&sc); - bool fAccepted = ProcessNewBlock(state, Params(), NULL, &block, true, NULL); + bool fAccepted = ProcessNewBlock(state, Params(), NULL, &block, true, NULL, false); UnregisterValidationInterface(&sc); if (fBlockPresent) { diff --git a/src/test/miner_tests.cpp b/src/test/miner_tests.cpp index a94979fd7..2762cafa3 100644 --- a/src/test/miner_tests.cpp +++ b/src/test/miner_tests.cpp @@ -223,7 +223,7 @@ BOOST_AUTO_TEST_CASE(CreateNewBlock_validity) pblock->hashMerkleRoot = BlockMerkleRoot(*pblock); pblock->nNonce = blockinfo[i].nonce; CValidationState state; - BOOST_CHECK(ProcessNewBlock(state, chainparams, NULL, pblock, true, NULL)); + BOOST_CHECK(ProcessNewBlock(state, chainparams, NULL, pblock, true, NULL, false)); BOOST_CHECK(state.IsValid()); pblock->hashPrevBlock = pblock->GetHash(); } diff --git a/src/test/test_bitcoin.cpp b/src/test/test_bitcoin.cpp index 98f4ed939..3da0be8ca 100644 --- a/src/test/test_bitcoin.cpp +++ b/src/test/test_bitcoin.cpp @@ -127,7 +127,7 @@ TestChain100Setup::CreateAndProcessBlock(const std::vector& while (!CheckProofOfWork(block.GetHash(), block.nBits, chainparams.GetConsensus())) ++block.nNonce; CValidationState state; - ProcessNewBlock(state, chainparams, NULL, &block, true, NULL); + ProcessNewBlock(state, chainparams, NULL, &block, true, NULL, false); CBlock result = block; return result; -- cgit v1.2.3 From d4833ff74701cc97aab733c54adb8f46e602fa5e Mon Sep 17 00:00:00 2001 From: Suhas Daftuar Date: Tue, 1 Nov 2016 11:12:43 -0400 Subject: Bump the protocol version to distinguish new banning behavior. This allows future software that would relay compact blocks before full validation to announce only to peers that will not ban if the block turns out to be invalid. --- src/version.h | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) (limited to 'src') diff --git a/src/version.h b/src/version.h index 87bd65506..87fb1a3a7 100644 --- a/src/version.h +++ b/src/version.h @@ -9,7 +9,7 @@ * network protocol versioning */ -static const int PROTOCOL_VERSION = 70014; +static const int PROTOCOL_VERSION = 70015; //! initial proto version, to be increased after version/verack negotiation static const int INIT_PROTO_VERSION = 209; @@ -42,4 +42,7 @@ static const int FEEFILTER_VERSION = 70013; //! short-id-based block download starts with this version static const int SHORT_IDS_BLOCKS_VERSION = 70014; +//! not banning for invalid compact blocks starts with this version +static const int INVALID_CB_NO_BAN_VERSION = 70015; + #endif // BITCOIN_VERSION_H -- cgit v1.2.3