cf0277928f
Add logging and error handling inside, and outside of FileCommit. Functions such as fsync, fdatasync will return error in case of hardware I/O errors, and ignoring this means it can silently continue through data corruption. (c.f. https://lwn.net/SubscriberLink/752063/12b232ab5039efbe/)
146 lines
3.9 KiB
C++
146 lines
3.9 KiB
C++
// Copyright (c) 2009-2010 Satoshi Nakamoto
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// Copyright (c) 2009-2017 The Bitcoin Core developers
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// Distributed under the MIT software license, see the accompanying
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// file COPYING or http://www.opensource.org/licenses/mit-license.php.
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#include <addrdb.h>
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#include <addrman.h>
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#include <chainparams.h>
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#include <clientversion.h>
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#include <hash.h>
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#include <random.h>
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#include <streams.h>
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#include <tinyformat.h>
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#include <util.h>
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namespace {
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template <typename Stream, typename Data>
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bool SerializeDB(Stream& stream, const Data& data)
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{
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// Write and commit header, data
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try {
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CHashWriter hasher(SER_DISK, CLIENT_VERSION);
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stream << Params().MessageStart() << data;
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hasher << Params().MessageStart() << data;
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stream << hasher.GetHash();
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} catch (const std::exception& e) {
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return error("%s: Serialize or I/O error - %s", __func__, e.what());
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}
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return true;
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}
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template <typename Data>
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bool SerializeFileDB(const std::string& prefix, const fs::path& path, const Data& data)
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{
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// Generate random temporary filename
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unsigned short randv = 0;
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GetRandBytes((unsigned char*)&randv, sizeof(randv));
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std::string tmpfn = strprintf("%s.%04x", prefix, randv);
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// open temp output file, and associate with CAutoFile
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fs::path pathTmp = GetDataDir() / tmpfn;
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FILE *file = fsbridge::fopen(pathTmp, "wb");
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CAutoFile fileout(file, SER_DISK, CLIENT_VERSION);
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if (fileout.IsNull())
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return error("%s: Failed to open file %s", __func__, pathTmp.string());
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// Serialize
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if (!SerializeDB(fileout, data)) return false;
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if (!FileCommit(fileout.Get()))
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return error("%s: Failed to flush file %s", __func__, pathTmp.string());
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fileout.fclose();
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// replace existing file, if any, with new file
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if (!RenameOver(pathTmp, path))
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return error("%s: Rename-into-place failed", __func__);
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return true;
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}
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template <typename Stream, typename Data>
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bool DeserializeDB(Stream& stream, Data& data, bool fCheckSum = true)
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{
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try {
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CHashVerifier<Stream> verifier(&stream);
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// de-serialize file header (network specific magic number) and ..
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unsigned char pchMsgTmp[4];
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verifier >> pchMsgTmp;
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// ... verify the network matches ours
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if (memcmp(pchMsgTmp, Params().MessageStart(), sizeof(pchMsgTmp)))
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return error("%s: Invalid network magic number", __func__);
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// de-serialize data
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verifier >> data;
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// verify checksum
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if (fCheckSum) {
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uint256 hashTmp;
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stream >> hashTmp;
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if (hashTmp != verifier.GetHash()) {
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return error("%s: Checksum mismatch, data corrupted", __func__);
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}
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}
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}
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catch (const std::exception& e) {
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return error("%s: Deserialize or I/O error - %s", __func__, e.what());
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}
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return true;
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}
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template <typename Data>
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bool DeserializeFileDB(const fs::path& path, Data& data)
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{
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// open input file, and associate with CAutoFile
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FILE *file = fsbridge::fopen(path, "rb");
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CAutoFile filein(file, SER_DISK, CLIENT_VERSION);
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if (filein.IsNull())
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return error("%s: Failed to open file %s", __func__, path.string());
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return DeserializeDB(filein, data);
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}
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}
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CBanDB::CBanDB()
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{
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pathBanlist = GetDataDir() / "banlist.dat";
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}
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bool CBanDB::Write(const banmap_t& banSet)
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{
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return SerializeFileDB("banlist", pathBanlist, banSet);
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}
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bool CBanDB::Read(banmap_t& banSet)
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{
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return DeserializeFileDB(pathBanlist, banSet);
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}
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CAddrDB::CAddrDB()
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{
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pathAddr = GetDataDir() / "peers.dat";
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}
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bool CAddrDB::Write(const CAddrMan& addr)
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{
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return SerializeFileDB("peers", pathAddr, addr);
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}
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bool CAddrDB::Read(CAddrMan& addr)
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{
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return DeserializeFileDB(pathAddr, addr);
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}
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bool CAddrDB::Read(CAddrMan& addr, CDataStream& ssPeers)
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{
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bool ret = DeserializeDB(ssPeers, addr, false);
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if (!ret) {
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// Ensure addrman is left in a clean state
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addr.Clear();
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}
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return ret;
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}
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