Add checksums to undo data
This should be compatible with older code that didn't write checksums.
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parent
2cbd71da06
commit
8539361e66
2 changed files with 52 additions and 16 deletions
22
src/main.cpp
22
src/main.cpp
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@ -1474,19 +1474,11 @@ bool CBlock::DisconnectBlock(CBlockIndex *pindex, CCoinsViewCache &view, bool *p
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bool fClean = true;
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CBlockUndo blockUndo;
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{
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CDiskBlockPos pos = pindex->GetUndoPos();
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if (pos.IsNull())
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return error("DisconnectBlock() : no undo data available");
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CAutoFile fileUndo(OpenUndoFile(pos, true), SER_DISK, CLIENT_VERSION);
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if (!fileUndo)
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return error("DisconnectBlock() : cannot open undo file");
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try {
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fileUndo >> blockUndo;
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} catch(std::exception &e) {
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return error("DisconnectBlock() : deserialize or I/O error reading udno data");
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}
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}
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CDiskBlockPos pos = pindex->GetUndoPos();
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if (pos.IsNull())
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return error("DisconnectBlock() : no undo data available");
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if (!blockUndo.ReadFromDisk(pos, pindex->pprev->GetBlockHash()))
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return error("DisconnectBlock() : failure reading undo data");
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if (blockUndo.vtxundo.size() + 1 != vtx.size())
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return error("DisconnectBlock() : block and undo data inconsistent");
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@ -1670,9 +1662,9 @@ bool CBlock::ConnectBlock(CBlockIndex* pindex, CCoinsViewCache &view, bool fJust
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{
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if (pindex->GetUndoPos().IsNull()) {
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CDiskBlockPos pos;
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if (!FindUndoPos(pindex->nFile, pos, ::GetSerializeSize(blockundo, SER_DISK, CLIENT_VERSION) + 8))
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if (!FindUndoPos(pindex->nFile, pos, ::GetSerializeSize(blockundo, SER_DISK, CLIENT_VERSION) + 40))
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return error("ConnectBlock() : FindUndoPos failed");
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if (!blockundo.WriteToDisk(pos))
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if (!blockundo.WriteToDisk(pos, pindex->pprev->GetBlockHash()))
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return error("ConnectBlock() : CBlockUndo::WriteToDisk failed");
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// update nUndoPos in block index
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46
src/main.h
46
src/main.h
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@ -746,7 +746,7 @@ public:
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READWRITE(vtxundo);
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)
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bool WriteToDisk(CDiskBlockPos &pos)
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bool WriteToDisk(CDiskBlockPos &pos, const uint256 &hashBlock)
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{
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// Open history file to append
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CAutoFile fileout = CAutoFile(OpenUndoFile(pos), SER_DISK, CLIENT_VERSION);
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@ -764,6 +764,12 @@ public:
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pos.nPos = (unsigned int)fileOutPos;
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fileout << *this;
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// calculate & write checksum
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CHashWriter hasher(SER_GETHASH, PROTOCOL_VERSION);
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hasher << hashBlock;
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hasher << *this;
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fileout << hasher.GetHash();
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// Flush stdio buffers and commit to disk before returning
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fflush(fileout);
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if (!IsInitialBlockDownload())
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@ -771,6 +777,44 @@ public:
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return true;
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}
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bool ReadFromDisk(const CDiskBlockPos &pos, const uint256 &hashBlock)
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{
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// Open history file to read
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CAutoFile filein = CAutoFile(OpenUndoFile(pos, true), SER_DISK, CLIENT_VERSION);
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if (!filein)
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return error("CBlockUndo::ReadFromDisk() : OpenBlockFile failed");
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// Read block
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uint256 hashChecksum;
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try {
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filein >> *this;
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}
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catch (std::exception &e) {
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return error("%s() : deserialize or I/O error", __PRETTY_FUNCTION__);
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}
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// for compatibility with pre-release code that didn't write checksums to undo data
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// TODO: replace by a simply 'filein >> hashChecksum' in the above try block
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try {
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filein >> hashChecksum;
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} catch (std::exception &e) {
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hashChecksum = 0;
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}
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uint32_t hashInit = hashChecksum.Get64(0) & 0xFFFFFFFFUL;
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if (hashChecksum == 0 || memcmp(&hashInit, pchMessageStart, 4) == 0)
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return true;
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// Verify checksum
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CHashWriter hasher(SER_GETHASH, PROTOCOL_VERSION);
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hasher << hashBlock;
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hasher << *this;
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if (hashChecksum != hasher.GetHash())
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return error("CBlockUndo::ReadFromDisk() : checksum mismatch");
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return true;
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}
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};
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/** pruned version of CTransaction: only retains metadata and unspent transaction outputs
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