diff options
Diffstat (limited to 'src/main.cpp')
| -rw-r--r-- | src/main.cpp | 25 |
1 files changed, 11 insertions, 14 deletions
diff --git a/src/main.cpp b/src/main.cpp index c9a2f34a4..fdbcfa52f 100644 --- a/src/main.cpp +++ b/src/main.cpp @@ -3355,19 +3355,17 @@ void static ProcessGetData(CNode* pfrom) BlockMap::iterator mi = mapBlockIndex.find(inv.hash); if (mi != mapBlockIndex.end()) { - // If the requested block is at a height below our last - // checkpoint, only serve it if it's in the checkpointed chain - int nHeight = mi->second->nHeight; - CBlockIndex* pcheckpoint = Checkpoints::GetLastCheckpoint(); - if (pcheckpoint && nHeight < pcheckpoint->nHeight) { - if (!chainActive.Contains(mi->second)) - { - LogPrintf("ProcessGetData(): ignoring request for old block that isn't in the main chain\n"); - } else { - send = true; - } - } else { + if (chainActive.Contains(mi->second)) { send = true; + } else { + // To prevent fingerprinting attacks, only send blocks outside of the active + // chain if they are valid, and no more than a month older than the best header + // chain we know about. + send = mi->second->IsValid(BLOCK_VALID_SCRIPTS) && (pindexBestHeader != NULL) && + (mi->second->GetBlockTime() > pindexBestHeader->GetBlockTime() - 30 * 24 * 60 * 60); + if (!send) { + LogPrintf("ProcessGetData(): ignoring request from peer=%i for old block that isn't in the main chain\n", pfrom->GetId()); + } } } if (send) @@ -4320,8 +4318,7 @@ bool ProcessMessages(CNode* pfrom) // Checksum CDataStream& vRecv = msg.vRecv; uint256 hash = Hash(vRecv.begin(), vRecv.begin() + nMessageSize); - unsigned int nChecksum = 0; - memcpy(&nChecksum, &hash, sizeof(nChecksum)); + unsigned int nChecksum = ReadLE32((unsigned char*)&hash); if (nChecksum != hdr.nChecksum) { LogPrintf("ProcessMessages(%s, %u bytes): CHECKSUM ERROR nChecksum=%08x hdr.nChecksum=%08x\n", |