diff options
author | Suhas Daftuar <sdaftuar@gmail.com> | 2016-10-31 10:03:49 -0400 |
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committer | Suhas Daftuar <sdaftuar@gmail.com> | 2016-11-01 13:20:21 -0400 |
commit | 015865ee9e5dd450ceb6cece489f924aaa1137e3 (patch) | |
tree | 4dd272a3f0c4a0fad6957a8294ab7cdb8bb73993 | |
parent | 82905069bfd763f16a63649eb51ed3a566bca2c5 (diff) | |
download | bitcoin-015865ee9e5dd450ceb6cece489f924aaa1137e3.tar.xz |
Fix compact block handling to not ban if block is invalid
-rw-r--r-- | src/blockencodings.cpp | 2 | ||||
-rw-r--r-- | src/blockencodings.h | 2 | ||||
-rw-r--r-- | src/main.cpp | 47 | ||||
-rw-r--r-- | src/main.h | 2 | ||||
-rw-r--r-- | src/rpc/mining.cpp | 4 | ||||
-rw-r--r-- | src/test/miner_tests.cpp | 2 | ||||
-rw-r--r-- | src/test/test_bitcoin.cpp | 2 |
7 files changed, 40 insertions, 21 deletions
diff --git a/src/blockencodings.cpp b/src/blockencodings.cpp index 93d3fa372b..737102f168 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 2f87c6d31d..cab847ee3a 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 61d0aaf0b9..850380abba 100644 --- a/src/main.cpp +++ b/src/main.cpp @@ -178,8 +178,10 @@ 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<uint256, NodeId> mapBlockSource; + map<uint256, std::pair<NodeId, bool>> mapBlockSource; /** * Filter for transactions that were recently rejected by @@ -1885,13 +1887,13 @@ void static InvalidChainFound(CBlockIndex* pindexNew) void static InvalidBlockFound(CBlockIndex *pindex, const CValidationState &state) { int nDoS = 0; if (state.IsInvalid(nDoS)) { - std::map<uint256, NodeId>::iterator it = mapBlockSource.find(pindex->GetBlockHash()); - if (it != mapBlockSource.end() && State(it->second)) { + std::map<uint256, std::pair<NodeId, bool>>::iterator it = mapBlockSource.find(pindex->GetBlockHash()); + 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), pindex->GetBlockHash()}; - 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 (!state.CorruptionPossible()) { @@ -3761,7 +3763,7 @@ static bool IsSuperMajority(int minVersion, const CBlockIndex* pstart, unsigned } -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); @@ -3773,7 +3775,7 @@ bool ProcessNewBlock(CValidationState& state, const CChainParams& chainparams, C bool fNewBlock = false; bool ret = AcceptBlock(*pblock, state, chainparams, &pindex, fRequested, 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()); @@ -4717,7 +4719,6 @@ std::string GetWarnings(const std::string& strFor) ////////////////////////////////////////////////////////////////////////////// -// // Messages // @@ -5791,17 +5792,33 @@ 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. CValidationState state; - ProcessNewBlock(state, chainparams, pfrom, &block, false, 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, false, 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); - } } } } @@ -5968,7 +5985,7 @@ bool static ProcessMessage(CNode* pfrom, string strCommand, CDataStream& vRecv, // Such an unrequested block may still be processed, subject to the // conditions in AcceptBlock(). bool forceProcessing = pfrom->fWhitelisted && !IsInitialBlockDownload(); - 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 0ca13d82d6..daf884337d 100644 --- a/src/main.h +++ b/src/main.h @@ -222,7 +222,7 @@ void UnregisterNodeSignals(CNodeSignals& nodeSignals); * @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 14a61a55dd..e6901bc77e 100644 --- a/src/rpc/mining.cpp +++ b/src/rpc/mining.cpp @@ -131,7 +131,7 @@ UniValue generateBlocks(boost::shared_ptr<CReserveScript> 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()); @@ -760,7 +760,7 @@ UniValue submitblock(const UniValue& params, bool fHelp) 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 15fceb963a..70ba707795 100644 --- a/src/test/miner_tests.cpp +++ b/src/test/miner_tests.cpp @@ -222,7 +222,7 @@ 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 056f2982cf..09f9a362d0 100644 --- a/src/test/test_bitcoin.cpp +++ b/src/test/test_bitcoin.cpp @@ -118,7 +118,7 @@ TestChain100Setup::CreateAndProcessBlock(const std::vector<CMutableTransaction>& 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; delete pblocktemplate; |