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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 <netbase.h>
#include <random.h>
#include <streams.h>
#include <tinyformat.h>
#include <univalue.h>
#include <util/settings.h>
#include <util/system.h>
#include <util/translation.h>
namespace {
class DbNotFoundError : public std::exception
{
using std::exception::exception;
};
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>
void DeserializeDB(Stream& stream, Data& data, bool fCheckSum = true)
{
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))) {
throw std::runtime_error{"Invalid network magic number"};
}
// de-serialize data
verifier >> data;
// verify checksum
if (fCheckSum) {
uint256 hashTmp;
stream >> hashTmp;
if (hashTmp != verifier.GetHash()) {
throw std::runtime_error{"Checksum mismatch, data corrupted"};
}
}
}
template <typename Data>
void 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()) {
throw DbNotFoundError{};
}
DeserializeDB(filein, data);
}
} // namespace
CBanDB::CBanDB(fs::path ban_list_path)
: m_banlist_dat(ban_list_path.string() + ".dat"),
m_banlist_json(ban_list_path.string() + ".json")
{
}
bool CBanDB::Write(const banmap_t& banSet)
{
std::vector<std::string> errors;
if (util::WriteSettings(m_banlist_json, {{JSON_KEY, BanMapToJson(banSet)}}, errors)) {
return true;
}
for (const auto& err : errors) {
error("%s", err);
}
return false;
}
bool CBanDB::Read(banmap_t& banSet)
{
if (fs::exists(m_banlist_dat)) {
LogPrintf("banlist.dat ignored because it can only be read by " PACKAGE_NAME " version 22.x. Remove %s to silence this warning.\n", m_banlist_dat);
}
// If the JSON banlist does not exist, then recreate it
if (!fs::exists(m_banlist_json)) {
return false;
}
std::map<std::string, util::SettingsValue> settings;
std::vector<std::string> errors;
if (!util::ReadSettings(m_banlist_json, settings, errors)) {
for (const auto& err : errors) {
LogPrintf("Cannot load banlist %s: %s\n", m_banlist_json.string(), err);
}
return false;
}
try {
BanMapFromJson(settings[JSON_KEY], banSet);
} catch (const std::runtime_error& e) {
LogPrintf("Cannot parse banlist %s: %s\n", m_banlist_json.string(), e.what());
return false;
}
return true;
}
bool DumpPeerAddresses(const ArgsManager& args, const CAddrMan& addr)
{
const auto pathAddr = args.GetDataDirNet() / "peers.dat";
return SerializeFileDB("peers", pathAddr, addr, CLIENT_VERSION);
}
void ReadFromStream(CAddrMan& addr, CDataStream& ssPeers)
{
DeserializeDB(ssPeers, addr, false);
}
std::optional<bilingual_str> LoadAddrman(const std::vector<bool>& asmap, const ArgsManager& args, std::unique_ptr<CAddrMan>& addrman)
{
auto check_addrman = std::clamp<int32_t>(args.GetArg("-checkaddrman", DEFAULT_ADDRMAN_CONSISTENCY_CHECKS), 0, 1000000);
addrman = std::make_unique<CAddrMan>(asmap, /* deterministic */ false, /* consistency_check_ratio */ check_addrman);
int64_t nStart = GetTimeMillis();
const auto path_addr{args.GetDataDirNet() / "peers.dat"};
try {
DeserializeFileDB(path_addr, *addrman, CLIENT_VERSION);
LogPrintf("Loaded %i addresses from peers.dat %dms\n", addrman->size(), GetTimeMillis() - nStart);
} catch (const DbNotFoundError&) {
// Addrman can be in an inconsistent state after failure, reset it
addrman = std::make_unique<CAddrMan>(asmap, /* deterministic */ false, /* consistency_check_ratio */ check_addrman);
LogPrintf("Creating peers.dat because the file was not found (%s)\n", path_addr);
DumpPeerAddresses(args, *addrman);
} catch (const std::exception& e) {
addrman = nullptr;
return strprintf(_("Invalid or corrupt peers.dat (%s). If you believe this is a bug, please report it to %s. As a workaround, you can move the file (%s) out of the way (rename, move, or delete) to have a new one created on the next start."),
e.what(), PACKAGE_BUGREPORT, path_addr);
}
return std::nullopt;
}
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;
try {
DeserializeFileDB(anchors_db_path, anchors, CLIENT_VERSION | ADDRV2_FORMAT);
LogPrintf("Loaded %i addresses from %s\n", anchors.size(), anchors_db_path.filename());
} catch (const std::exception&) {
anchors.clear();
}
fs::remove(anchors_db_path);
return anchors;
}
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