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// Copyright (c) 2009-2010 Satoshi Nakamoto
// Copyright (c) 2009-2020 The Bitcoin Core developers
// Distributed under the MIT software license, see the accompanying
// file COPYING or http://www.opensource.org/licenses/mit-license.php.
#include <addrdb.h>
#include <addrman.h>
#include <chainparams.h>
#include <clientversion.h>
#include <cstdint>
#include <hash.h>
#include <logging/timer.h>
#include <random.h>
#include <streams.h>
#include <tinyformat.h>
#include <util/system.h>
namespace {
template <typename Stream, typename Data>
bool SerializeDB(Stream& stream, const Data& data)
{
// Write and commit header, data
try {
CHashWriter hasher(stream.GetType(), stream.GetVersion());
stream << Params().MessageStart() << data;
hasher << Params().MessageStart() << data;
stream << hasher.GetHash();
} catch (const std::exception& e) {
return error("%s: Serialize or I/O error - %s", __func__, e.what());
}
return true;
}
template <typename Data>
bool SerializeFileDB(const std::string& prefix, const fs::path& path, const Data& data, int version)
{
// Generate random temporary filename
uint16_t randv = 0;
GetRandBytes((unsigned char*)&randv, sizeof(randv));
std::string tmpfn = strprintf("%s.%04x", prefix, randv);
// open temp output file, and associate with CAutoFile
fs::path pathTmp = gArgs.GetDataDirNet() / tmpfn;
FILE *file = fsbridge::fopen(pathTmp, "wb");
CAutoFile fileout(file, SER_DISK, version);
if (fileout.IsNull()) {
fileout.fclose();
remove(pathTmp);
return error("%s: Failed to open file %s", __func__, pathTmp.string());
}
// Serialize
if (!SerializeDB(fileout, data)) {
fileout.fclose();
remove(pathTmp);
return false;
}
if (!FileCommit(fileout.Get())) {
fileout.fclose();
remove(pathTmp);
return error("%s: Failed to flush file %s", __func__, pathTmp.string());
}
fileout.fclose();
// replace existing file, if any, with new file
if (!RenameOver(pathTmp, path)) {
remove(pathTmp);
return error("%s: Rename-into-place failed", __func__);
}
return true;
}
template <typename Stream, typename Data>
bool DeserializeDB(Stream& stream, Data& data, bool fCheckSum = true)
{
try {
CHashVerifier<Stream> verifier(&stream);
// de-serialize file header (network specific magic number) and ..
unsigned char pchMsgTmp[4];
verifier >> pchMsgTmp;
// ... verify the network matches ours
if (memcmp(pchMsgTmp, Params().MessageStart(), sizeof(pchMsgTmp)))
return error("%s: Invalid network magic number", __func__);
// de-serialize data
verifier >> data;
// verify checksum
if (fCheckSum) {
uint256 hashTmp;
stream >> hashTmp;
if (hashTmp != verifier.GetHash()) {
return error("%s: Checksum mismatch, data corrupted", __func__);
}
}
}
catch (const std::exception& e) {
return error("%s: Deserialize or I/O error - %s", __func__, e.what());
}
return true;
}
template <typename Data>
bool DeserializeFileDB(const fs::path& path, Data& data, int version)
{
// open input file, and associate with CAutoFile
FILE* file = fsbridge::fopen(path, "rb");
CAutoFile filein(file, SER_DISK, version);
if (filein.IsNull()) {
LogPrintf("Missing or invalid file %s\n", path.string());
return false;
}
return DeserializeDB(filein, data);
}
} // namespace
CBanDB::CBanDB(fs::path ban_list_path) : m_ban_list_path(std::move(ban_list_path))
{
}
bool CBanDB::Write(const banmap_t& banSet)
{
return SerializeFileDB("banlist", m_ban_list_path, banSet, CLIENT_VERSION);
}
bool CBanDB::Read(banmap_t& banSet)
{
return DeserializeFileDB(m_ban_list_path, banSet, CLIENT_VERSION);
}
CAddrDB::CAddrDB()
{
pathAddr = gArgs.GetDataDirNet() / "peers.dat";
}
bool CAddrDB::Write(const CAddrMan& addr)
{
return SerializeFileDB("peers", pathAddr, addr, CLIENT_VERSION);
}
bool CAddrDB::Read(CAddrMan& addr)
{
return DeserializeFileDB(pathAddr, addr, CLIENT_VERSION);
}
bool CAddrDB::Read(CAddrMan& addr, CDataStream& ssPeers)
{
bool ret = DeserializeDB(ssPeers, addr, false);
if (!ret) {
// Ensure addrman is left in a clean state
addr.Clear();
}
return ret;
}
void DumpAnchors(const fs::path& anchors_db_path, const std::vector<CAddress>& anchors)
{
LOG_TIME_SECONDS(strprintf("Flush %d outbound block-relay-only peer addresses to anchors.dat", anchors.size()));
SerializeFileDB("anchors", anchors_db_path, anchors, CLIENT_VERSION | ADDRV2_FORMAT);
}
std::vector<CAddress> ReadAnchors(const fs::path& anchors_db_path)
{
std::vector<CAddress> anchors;
if (DeserializeFileDB(anchors_db_path, anchors, CLIENT_VERSION | ADDRV2_FORMAT)) {
LogPrintf("Loaded %i addresses from %s\n", anchors.size(), anchors_db_path.filename());
} else {
anchors.clear();
}
fs::remove(anchors_db_path);
return anchors;
}
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