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lbrycrd/src/wallet/walletdb.cpp
John Newbery fdf8888b6f [build] Move CheckTransaction from lib_server to lib_consensus 
CheckTransaction is a context-free function that does not require access
to the blockchain or mempool. Move it from src/consensus/tx_verify in
lib_server to a new unit src/consensus/tx_check in lib_consensus so that
it can be called by non-server libraries.
2019-04-09 17:53:08 -04:00

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// Copyright (c) 2009-2010 Satoshi Nakamoto
// Copyright (c) 2009-2018 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 <wallet/walletdb.h>
#include <consensus/tx_check.h>
#include <consensus/validation.h>
#include <fs.h>
#include <key_io.h>
#include <protocol.h>
#include <serialize.h>
#include <sync.h>
#include <util/system.h>
#include <util/time.h>
#include <wallet/wallet.h>
#include <atomic>
#include <string>
#include <boost/thread.hpp>
//
// WalletBatch
//
bool WalletBatch::WriteName(const std::string& strAddress, const std::string& strName)
{
return WriteIC(std::make_pair(std::string("name"), strAddress), strName);
}
bool WalletBatch::EraseName(const std::string& strAddress)
{
// This should only be used for sending addresses, never for receiving addresses,
// receiving addresses must always have an address book entry if they're not change return.
return EraseIC(std::make_pair(std::string("name"), strAddress));
}
bool WalletBatch::WritePurpose(const std::string& strAddress, const std::string& strPurpose)
{
return WriteIC(std::make_pair(std::string("purpose"), strAddress), strPurpose);
}
bool WalletBatch::ErasePurpose(const std::string& strAddress)
{
return EraseIC(std::make_pair(std::string("purpose"), strAddress));
}
bool WalletBatch::WriteTx(const CWalletTx& wtx)
{
return WriteIC(std::make_pair(std::string("tx"), wtx.GetHash()), wtx);
}
bool WalletBatch::EraseTx(uint256 hash)
{
return EraseIC(std::make_pair(std::string("tx"), hash));
}
bool WalletBatch::WriteKeyMetadata(const CKeyMetadata& meta, const CPubKey& pubkey, const bool overwrite)
{
return WriteIC(std::make_pair(std::string("keymeta"), pubkey), meta, overwrite);
}
bool WalletBatch::WriteKey(const CPubKey& vchPubKey, const CPrivKey& vchPrivKey, const CKeyMetadata& keyMeta)
{
if (!WriteKeyMetadata(keyMeta, vchPubKey, false)) {
return false;
}
// hash pubkey/privkey to accelerate wallet load
std::vector<unsigned char> vchKey;
vchKey.reserve(vchPubKey.size() + vchPrivKey.size());
vchKey.insert(vchKey.end(), vchPubKey.begin(), vchPubKey.end());
vchKey.insert(vchKey.end(), vchPrivKey.begin(), vchPrivKey.end());
return WriteIC(std::make_pair(std::string("key"), vchPubKey), std::make_pair(vchPrivKey, Hash(vchKey.begin(), vchKey.end())), false);
}
bool WalletBatch::WriteCryptedKey(const CPubKey& vchPubKey,
const std::vector<unsigned char>& vchCryptedSecret,
const CKeyMetadata &keyMeta)
{
if (!WriteKeyMetadata(keyMeta, vchPubKey, true)) {
return false;
}
if (!WriteIC(std::make_pair(std::string("ckey"), vchPubKey), vchCryptedSecret, false)) {
return false;
}
EraseIC(std::make_pair(std::string("key"), vchPubKey));
EraseIC(std::make_pair(std::string("wkey"), vchPubKey));
return true;
}
bool WalletBatch::WriteMasterKey(unsigned int nID, const CMasterKey& kMasterKey)
{
return WriteIC(std::make_pair(std::string("mkey"), nID), kMasterKey, true);
}
bool WalletBatch::WriteCScript(const uint160& hash, const CScript& redeemScript)
{
return WriteIC(std::make_pair(std::string("cscript"), hash), redeemScript, false);
}
bool WalletBatch::WriteWatchOnly(const CScript &dest, const CKeyMetadata& keyMeta)
{
if (!WriteIC(std::make_pair(std::string("watchmeta"), dest), keyMeta)) {
return false;
}
return WriteIC(std::make_pair(std::string("watchs"), dest), '1');
}
bool WalletBatch::EraseWatchOnly(const CScript &dest)
{
if (!EraseIC(std::make_pair(std::string("watchmeta"), dest))) {
return false;
}
return EraseIC(std::make_pair(std::string("watchs"), dest));
}
bool WalletBatch::WriteBestBlock(const CBlockLocator& locator)
{
WriteIC(std::string("bestblock"), CBlockLocator()); // Write empty block locator so versions that require a merkle branch automatically rescan
return WriteIC(std::string("bestblock_nomerkle"), locator);
}
bool WalletBatch::ReadBestBlock(CBlockLocator& locator)
{
if (m_batch.Read(std::string("bestblock"), locator) && !locator.vHave.empty()) return true;
return m_batch.Read(std::string("bestblock_nomerkle"), locator);
}
bool WalletBatch::WriteOrderPosNext(int64_t nOrderPosNext)
{
return WriteIC(std::string("orderposnext"), nOrderPosNext);
}
bool WalletBatch::ReadPool(int64_t nPool, CKeyPool& keypool)
{
return m_batch.Read(std::make_pair(std::string("pool"), nPool), keypool);
}
bool WalletBatch::WritePool(int64_t nPool, const CKeyPool& keypool)
{
return WriteIC(std::make_pair(std::string("pool"), nPool), keypool);
}
bool WalletBatch::ErasePool(int64_t nPool)
{
return EraseIC(std::make_pair(std::string("pool"), nPool));
}
bool WalletBatch::WriteMinVersion(int nVersion)
{
return WriteIC(std::string("minversion"), nVersion);
}
class CWalletScanState {
public:
unsigned int nKeys{0};
unsigned int nCKeys{0};
unsigned int nWatchKeys{0};
unsigned int nKeyMeta{0};
unsigned int m_unknown_records{0};
bool fIsEncrypted{false};
bool fAnyUnordered{false};
int nFileVersion{0};
std::vector<uint256> vWalletUpgrade;
CWalletScanState() {
}
};
static bool
ReadKeyValue(CWallet* pwallet, CDataStream& ssKey, CDataStream& ssValue,
CWalletScanState &wss, std::string& strType, std::string& strErr) EXCLUSIVE_LOCKS_REQUIRED(pwallet->cs_wallet)
{
try {
// Unserialize
// Taking advantage of the fact that pair serialization
// is just the two items serialized one after the other
ssKey >> strType;
if (strType == "name")
{
std::string strAddress;
ssKey >> strAddress;
ssValue >> pwallet->mapAddressBook[DecodeDestination(strAddress)].name;
}
else if (strType == "purpose")
{
std::string strAddress;
ssKey >> strAddress;
ssValue >> pwallet->mapAddressBook[DecodeDestination(strAddress)].purpose;
}
else if (strType == "tx")
{
uint256 hash;
ssKey >> hash;
CWalletTx wtx(nullptr /* pwallet */, MakeTransactionRef());
ssValue >> wtx;
CValidationState state;
if (!(CheckTransaction(*wtx.tx, state) && (wtx.GetHash() == hash) && state.IsValid()))
return false;
// Undo serialize changes in 31600
if (31404 <= wtx.fTimeReceivedIsTxTime && wtx.fTimeReceivedIsTxTime <= 31703)
{
if (!ssValue.empty())
{
char fTmp;
char fUnused;
std::string unused_string;
ssValue >> fTmp >> fUnused >> unused_string;
strErr = strprintf("LoadWallet() upgrading tx ver=%d %d %s",
wtx.fTimeReceivedIsTxTime, fTmp, hash.ToString());
wtx.fTimeReceivedIsTxTime = fTmp;
}
else
{
strErr = strprintf("LoadWallet() repairing tx ver=%d %s", wtx.fTimeReceivedIsTxTime, hash.ToString());
wtx.fTimeReceivedIsTxTime = 0;
}
wss.vWalletUpgrade.push_back(hash);
}
if (wtx.nOrderPos == -1)
wss.fAnyUnordered = true;
pwallet->LoadToWallet(wtx);
}
else if (strType == "watchs")
{
wss.nWatchKeys++;
CScript script;
ssKey >> script;
char fYes;
ssValue >> fYes;
if (fYes == '1')
pwallet->LoadWatchOnly(script);
}
else if (strType == "key" || strType == "wkey")
{
CPubKey vchPubKey;
ssKey >> vchPubKey;
if (!vchPubKey.IsValid())
{
strErr = "Error reading wallet database: CPubKey corrupt";
return false;
}
CKey key;
CPrivKey pkey;
uint256 hash;
if (strType == "key")
{
wss.nKeys++;
ssValue >> pkey;
} else {
CWalletKey wkey;
ssValue >> wkey;
pkey = wkey.vchPrivKey;
}
// Old wallets store keys as "key" [pubkey] => [privkey]
// ... which was slow for wallets with lots of keys, because the public key is re-derived from the private key
// using EC operations as a checksum.
// Newer wallets store keys as "key"[pubkey] => [privkey][hash(pubkey,privkey)], which is much faster while
// remaining backwards-compatible.
try
{
ssValue >> hash;
}
catch (...) {}
bool fSkipCheck = false;
if (!hash.IsNull())
{
// hash pubkey/privkey to accelerate wallet load
std::vector<unsigned char> vchKey;
vchKey.reserve(vchPubKey.size() + pkey.size());
vchKey.insert(vchKey.end(), vchPubKey.begin(), vchPubKey.end());
vchKey.insert(vchKey.end(), pkey.begin(), pkey.end());
if (Hash(vchKey.begin(), vchKey.end()) != hash)
{
strErr = "Error reading wallet database: CPubKey/CPrivKey corrupt";
return false;
}
fSkipCheck = true;
}
if (!key.Load(pkey, vchPubKey, fSkipCheck))
{
strErr = "Error reading wallet database: CPrivKey corrupt";
return false;
}
if (!pwallet->LoadKey(key, vchPubKey))
{
strErr = "Error reading wallet database: LoadKey failed";
return false;
}
}
else if (strType == "mkey")
{
unsigned int nID;
ssKey >> nID;
CMasterKey kMasterKey;
ssValue >> kMasterKey;
if(pwallet->mapMasterKeys.count(nID) != 0)
{
strErr = strprintf("Error reading wallet database: duplicate CMasterKey id %u", nID);
return false;
}
pwallet->mapMasterKeys[nID] = kMasterKey;
if (pwallet->nMasterKeyMaxID < nID)
pwallet->nMasterKeyMaxID = nID;
}
else if (strType == "ckey")
{
CPubKey vchPubKey;
ssKey >> vchPubKey;
if (!vchPubKey.IsValid())
{
strErr = "Error reading wallet database: CPubKey corrupt";
return false;
}
std::vector<unsigned char> vchPrivKey;
ssValue >> vchPrivKey;
wss.nCKeys++;
if (!pwallet->LoadCryptedKey(vchPubKey, vchPrivKey))
{
strErr = "Error reading wallet database: LoadCryptedKey failed";
return false;
}
wss.fIsEncrypted = true;
}
else if (strType == "keymeta")
{
CPubKey vchPubKey;
ssKey >> vchPubKey;
CKeyMetadata keyMeta;
ssValue >> keyMeta;
wss.nKeyMeta++;
pwallet->LoadKeyMetadata(vchPubKey.GetID(), keyMeta);
}
else if (strType == "watchmeta")
{
CScript script;
ssKey >> script;
CKeyMetadata keyMeta;
ssValue >> keyMeta;
wss.nKeyMeta++;
pwallet->LoadScriptMetadata(CScriptID(script), keyMeta);
}
else if (strType == "defaultkey")
{
// We don't want or need the default key, but if there is one set,
// we want to make sure that it is valid so that we can detect corruption
CPubKey vchPubKey;
ssValue >> vchPubKey;
if (!vchPubKey.IsValid()) {
strErr = "Error reading wallet database: Default Key corrupt";
return false;
}
}
else if (strType == "pool")
{
int64_t nIndex;
ssKey >> nIndex;
CKeyPool keypool;
ssValue >> keypool;
pwallet->LoadKeyPool(nIndex, keypool);
}
else if (strType == "version")
{
ssValue >> wss.nFileVersion;
if (wss.nFileVersion == 10300)
wss.nFileVersion = 300;
}
else if (strType == "cscript")
{
uint160 hash;
ssKey >> hash;
CScript script;
ssValue >> script;
if (!pwallet->LoadCScript(script))
{
strErr = "Error reading wallet database: LoadCScript failed";
return false;
}
}
else if (strType == "orderposnext")
{
ssValue >> pwallet->nOrderPosNext;
}
else if (strType == "destdata")
{
std::string strAddress, strKey, strValue;
ssKey >> strAddress;
ssKey >> strKey;
ssValue >> strValue;
pwallet->LoadDestData(DecodeDestination(strAddress), strKey, strValue);
}
else if (strType == "hdchain")
{
CHDChain chain;
ssValue >> chain;
pwallet->SetHDChain(chain, true);
} else if (strType == "flags") {
uint64_t flags;
ssValue >> flags;
if (!pwallet->SetWalletFlags(flags, true)) {
strErr = "Error reading wallet database: Unknown non-tolerable wallet flags found";
return false;
}
} else if (strType != "bestblock" && strType != "bestblock_nomerkle" &&
strType != "minversion" && strType != "acentry") {
wss.m_unknown_records++;
}
} catch (const std::exception& e) {
if (strErr.empty()) {
strErr = e.what();
}
return false;
} catch (...) {
if (strErr.empty()) {
strErr = "Caught unknown exception in ReadKeyValue";
}
return false;
}
return true;
}
bool WalletBatch::IsKeyType(const std::string& strType)
{
return (strType== "key" || strType == "wkey" ||
strType == "mkey" || strType == "ckey");
}
DBErrors WalletBatch::LoadWallet(CWallet* pwallet)
{
CWalletScanState wss;
bool fNoncriticalErrors = false;
DBErrors result = DBErrors::LOAD_OK;
LOCK(pwallet->cs_wallet);
try {
int nMinVersion = 0;
if (m_batch.Read((std::string)"minversion", nMinVersion))
{
if (nMinVersion > FEATURE_LATEST)
return DBErrors::TOO_NEW;
pwallet->LoadMinVersion(nMinVersion);
}
// Get cursor
Dbc* pcursor = m_batch.GetCursor();
if (!pcursor)
{
pwallet->WalletLogPrintf("Error getting wallet database cursor\n");
return DBErrors::CORRUPT;
}
while (true)
{
// Read next record
CDataStream ssKey(SER_DISK, CLIENT_VERSION);
CDataStream ssValue(SER_DISK, CLIENT_VERSION);
int ret = m_batch.ReadAtCursor(pcursor, ssKey, ssValue);
if (ret == DB_NOTFOUND)
break;
else if (ret != 0)
{
pwallet->WalletLogPrintf("Error reading next record from wallet database\n");
return DBErrors::CORRUPT;
}
// Try to be tolerant of single corrupt records:
std::string strType, strErr;
if (!ReadKeyValue(pwallet, ssKey, ssValue, wss, strType, strErr))
{
// losing keys is considered a catastrophic error, anything else
// we assume the user can live with:
if (IsKeyType(strType) || strType == "defaultkey") {
result = DBErrors::CORRUPT;
} else if(strType == "flags") {
// reading the wallet flags can only fail if unknown flags are present
result = DBErrors::TOO_NEW;
} else {
// Leave other errors alone, if we try to fix them we might make things worse.
fNoncriticalErrors = true; // ... but do warn the user there is something wrong.
if (strType == "tx")
// Rescan if there is a bad transaction record:
gArgs.SoftSetBoolArg("-rescan", true);
}
}
if (!strErr.empty())
pwallet->WalletLogPrintf("%s\n", strErr);
}
pcursor->close();
}
catch (const boost::thread_interrupted&) {
throw;
}
catch (...) {
result = DBErrors::CORRUPT;
}
if (fNoncriticalErrors && result == DBErrors::LOAD_OK)
result = DBErrors::NONCRITICAL_ERROR;
// Any wallet corruption at all: skip any rewriting or
// upgrading, we don't want to make it worse.
if (result != DBErrors::LOAD_OK)
return result;
pwallet->WalletLogPrintf("nFileVersion = %d\n", wss.nFileVersion);
pwallet->WalletLogPrintf("Keys: %u plaintext, %u encrypted, %u w/ metadata, %u total. Unknown wallet records: %u\n",
wss.nKeys, wss.nCKeys, wss.nKeyMeta, wss.nKeys + wss.nCKeys, wss.m_unknown_records);
// nTimeFirstKey is only reliable if all keys have metadata
if ((wss.nKeys + wss.nCKeys + wss.nWatchKeys) != wss.nKeyMeta)
pwallet->UpdateTimeFirstKey(1);
for (const uint256& hash : wss.vWalletUpgrade)
WriteTx(pwallet->mapWallet.at(hash));
// Rewrite encrypted wallets of versions 0.4.0 and 0.5.0rc:
if (wss.fIsEncrypted && (wss.nFileVersion == 40000 || wss.nFileVersion == 50000))
return DBErrors::NEED_REWRITE;
if (wss.nFileVersion < CLIENT_VERSION) // Update
WriteVersion(CLIENT_VERSION);
if (wss.fAnyUnordered)
result = pwallet->ReorderTransactions();
// Upgrade all of the wallet keymetadata to have the hd master key id
// This operation is not atomic, but if it fails, updated entries are still backwards compatible with older software
try {
pwallet->UpgradeKeyMetadata();
} catch (...) {
result = DBErrors::CORRUPT;
}
return result;
}
DBErrors WalletBatch::FindWalletTx(std::vector<uint256>& vTxHash, std::vector<CWalletTx>& vWtx)
{
DBErrors result = DBErrors::LOAD_OK;
try {
int nMinVersion = 0;
if (m_batch.Read((std::string)"minversion", nMinVersion))
{
if (nMinVersion > FEATURE_LATEST)
return DBErrors::TOO_NEW;
}
// Get cursor
Dbc* pcursor = m_batch.GetCursor();
if (!pcursor)
{
LogPrintf("Error getting wallet database cursor\n");
return DBErrors::CORRUPT;
}
while (true)
{
// Read next record
CDataStream ssKey(SER_DISK, CLIENT_VERSION);
CDataStream ssValue(SER_DISK, CLIENT_VERSION);
int ret = m_batch.ReadAtCursor(pcursor, ssKey, ssValue);
if (ret == DB_NOTFOUND)
break;
else if (ret != 0)
{
LogPrintf("Error reading next record from wallet database\n");
return DBErrors::CORRUPT;
}
std::string strType;
ssKey >> strType;
if (strType == "tx") {
uint256 hash;
ssKey >> hash;
CWalletTx wtx(nullptr /* pwallet */, MakeTransactionRef());
ssValue >> wtx;
vTxHash.push_back(hash);
vWtx.push_back(wtx);
}
}
pcursor->close();
}
catch (const boost::thread_interrupted&) {
throw;
}
catch (...) {
result = DBErrors::CORRUPT;
}
return result;
}
DBErrors WalletBatch::ZapSelectTx(std::vector<uint256>& vTxHashIn, std::vector<uint256>& vTxHashOut)
{
// build list of wallet TXs and hashes
std::vector<uint256> vTxHash;
std::vector<CWalletTx> vWtx;
DBErrors err = FindWalletTx(vTxHash, vWtx);
if (err != DBErrors::LOAD_OK) {
return err;
}
std::sort(vTxHash.begin(), vTxHash.end());
std::sort(vTxHashIn.begin(), vTxHashIn.end());
// erase each matching wallet TX
bool delerror = false;
std::vector<uint256>::iterator it = vTxHashIn.begin();
for (const uint256& hash : vTxHash) {
while (it < vTxHashIn.end() && (*it) < hash) {
it++;
}
if (it == vTxHashIn.end()) {
break;
}
else if ((*it) == hash) {
if(!EraseTx(hash)) {
LogPrint(BCLog::DB, "Transaction was found for deletion but returned database error: %s\n", hash.GetHex());
delerror = true;
}
vTxHashOut.push_back(hash);
}
}
if (delerror) {
return DBErrors::CORRUPT;
}
return DBErrors::LOAD_OK;
}
DBErrors WalletBatch::ZapWalletTx(std::vector<CWalletTx>& vWtx)
{
// build list of wallet TXs
std::vector<uint256> vTxHash;
DBErrors err = FindWalletTx(vTxHash, vWtx);
if (err != DBErrors::LOAD_OK)
return err;
// erase each wallet TX
for (const uint256& hash : vTxHash) {
if (!EraseTx(hash))
return DBErrors::CORRUPT;
}
return DBErrors::LOAD_OK;
}
void MaybeCompactWalletDB()
{
static std::atomic<bool> fOneThread(false);
if (fOneThread.exchange(true)) {
return;
}
if (!gArgs.GetBoolArg("-flushwallet", DEFAULT_FLUSHWALLET)) {
return;
}
for (const std::shared_ptr<CWallet>& pwallet : GetWallets()) {
WalletDatabase& dbh = pwallet->GetDBHandle();
unsigned int nUpdateCounter = dbh.nUpdateCounter;
if (dbh.nLastSeen != nUpdateCounter) {
dbh.nLastSeen = nUpdateCounter;
dbh.nLastWalletUpdate = GetTime();
}
if (dbh.nLastFlushed != nUpdateCounter && GetTime() - dbh.nLastWalletUpdate >= 2) {
if (BerkeleyBatch::PeriodicFlush(dbh)) {
dbh.nLastFlushed = nUpdateCounter;
}
}
}
fOneThread = false;
}
//
// Try to (very carefully!) recover wallet file if there is a problem.
//
bool WalletBatch::Recover(const fs::path& wallet_path, void *callbackDataIn, bool (*recoverKVcallback)(void* callbackData, CDataStream ssKey, CDataStream ssValue), std::string& out_backup_filename)
{
return BerkeleyBatch::Recover(wallet_path, callbackDataIn, recoverKVcallback, out_backup_filename);
}
bool WalletBatch::Recover(const fs::path& wallet_path, std::string& out_backup_filename)
{
// recover without a key filter callback
// results in recovering all record types
return WalletBatch::Recover(wallet_path, nullptr, nullptr, out_backup_filename);
}
bool WalletBatch::RecoverKeysOnlyFilter(void *callbackData, CDataStream ssKey, CDataStream ssValue)
{
CWallet *dummyWallet = reinterpret_cast<CWallet*>(callbackData);
CWalletScanState dummyWss;
std::string strType, strErr;
bool fReadOK;
{
// Required in LoadKeyMetadata():
LOCK(dummyWallet->cs_wallet);
fReadOK = ReadKeyValue(dummyWallet, ssKey, ssValue,
dummyWss, strType, strErr);
}
if (!IsKeyType(strType) && strType != "hdchain")
return false;
if (!fReadOK)
{
LogPrintf("WARNING: WalletBatch::Recover skipping %s: %s\n", strType, strErr);
return false;
}
return true;
}
bool WalletBatch::VerifyEnvironment(const fs::path& wallet_path, std::string& errorStr)
{
return BerkeleyBatch::VerifyEnvironment(wallet_path, errorStr);
}
bool WalletBatch::VerifyDatabaseFile(const fs::path& wallet_path, std::string& warningStr, std::string& errorStr)
{
return BerkeleyBatch::VerifyDatabaseFile(wallet_path, warningStr, errorStr, WalletBatch::Recover);
}
bool WalletBatch::WriteDestData(const std::string &address, const std::string &key, const std::string &value)
{
return WriteIC(std::make_pair(std::string("destdata"), std::make_pair(address, key)), value);
}
bool WalletBatch::EraseDestData(const std::string &address, const std::string &key)
{
return EraseIC(std::make_pair(std::string("destdata"), std::make_pair(address, key)));
}
bool WalletBatch::WriteHDChain(const CHDChain& chain)
{
return WriteIC(std::string("hdchain"), chain);
}
bool WalletBatch::WriteWalletFlags(const uint64_t flags)
{
return WriteIC(std::string("flags"), flags);
}
bool WalletBatch::TxnBegin()
{
return m_batch.TxnBegin();
}
bool WalletBatch::TxnCommit()
{
return m_batch.TxnCommit();
}
bool WalletBatch::TxnAbort()
{
return m_batch.TxnAbort();
}
bool WalletBatch::ReadVersion(int& nVersion)
{
return m_batch.ReadVersion(nVersion);
}
bool WalletBatch::WriteVersion(int nVersion)
{
return m_batch.WriteVersion(nVersion);
}
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