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wallet.cpp
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// Copyright (c) 2009-2010 Satoshi Nakamoto
// Copyright (c) 2009-2022 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/wallet.h>
#include <bitcoin-build-config.h> // IWYU pragma: keep
#include <addresstype.h>
#include <blockfilter.h>
#include <chain.h>
#include <coins.h>
#include <common/args.h>
#include <common/messages.h>
#include <common/settings.h>
#include <common/signmessage.h>
#include <common/system.h>
#include <consensus/amount.h>
#include <consensus/consensus.h>
#include <consensus/validation.h>
#include <external_signer.h>
#include <interfaces/chain.h>
#include <interfaces/handler.h>
#include <interfaces/wallet.h>
#include <kernel/chain.h>
#include <kernel/mempool_removal_reason.h>
#include <key.h>
#include <key_io.h>
#include <logging.h>
#include <node/types.h>
#include <outputtype.h>
#include <policy/feerate.h>
#include <primitives/block.h>
#include <primitives/transaction.h>
#include <psbt.h>
#include <pubkey.h>
#include <random.h>
#include <script/descriptor.h>
#include <script/interpreter.h>
#include <script/script.h>
#include <script/sign.h>
#include <script/signingprovider.h>
#include <script/solver.h>
#include <serialize.h>
#include <span.h>
#include <streams.h>
#include <support/allocators/secure.h>
#include <support/allocators/zeroafterfree.h>
#include <support/cleanse.h>
#include <sync.h>
#include <tinyformat.h>
#include <uint256.h>
#include <univalue.h>
#include <util/check.h>
#include <util/fs.h>
#include <util/fs_helpers.h>
#include <util/moneystr.h>
#include <util/result.h>
#include <util/string.h>
#include <util/time.h>
#include <util/translation.h>
#include <wallet/coincontrol.h>
#include <wallet/context.h>
#include <wallet/crypter.h>
#include <wallet/db.h>
#include <wallet/external_signer_scriptpubkeyman.h>
#include <wallet/scriptpubkeyman.h>
#include <wallet/transaction.h>
#include <wallet/types.h>
#include <wallet/walletdb.h>
#include <wallet/walletutil.h>
#include <algorithm>
#include <cassert>
#include <condition_variable>
#include <exception>
#include <optional>
#include <stdexcept>
#include <thread>
#include <tuple>
#include <variant>
struct KeyOriginInfo;
using common::AmountErrMsg;
using common::AmountHighWarn;
using common::PSBTError;
using interfaces::FoundBlock;
using util::ReplaceAll;
using util::ToString;
namespace wallet {
bool AddWalletSetting(interfaces::Chain& chain, const std::string& wallet_name)
{
const auto update_function = [&wallet_name](common::SettingsValue& setting_value) {
if (!setting_value.isArray()) setting_value.setArray();
for (const auto& value : setting_value.getValues()) {
if (value.isStr() && value.get_str() == wallet_name) return interfaces::SettingsAction::SKIP_WRITE;
}
setting_value.push_back(wallet_name);
return interfaces::SettingsAction::WRITE;
};
return chain.updateRwSetting("wallet", update_function);
}
bool RemoveWalletSetting(interfaces::Chain& chain, const std::string& wallet_name)
{
const auto update_function = [&wallet_name](common::SettingsValue& setting_value) {
if (!setting_value.isArray()) return interfaces::SettingsAction::SKIP_WRITE;
common::SettingsValue new_value(common::SettingsValue::VARR);
for (const auto& value : setting_value.getValues()) {
if (!value.isStr() || value.get_str() != wallet_name) new_value.push_back(value);
}
if (new_value.size() == setting_value.size()) return interfaces::SettingsAction::SKIP_WRITE;
setting_value = std::move(new_value);
return interfaces::SettingsAction::WRITE;
};
return chain.updateRwSetting("wallet", update_function);
}
static void UpdateWalletSetting(interfaces::Chain& chain,
const std::string& wallet_name,
std::optional<bool> load_on_startup,
std::vector<bilingual_str>& warnings)
{
if (!load_on_startup) return;
if (load_on_startup.value() && !AddWalletSetting(chain, wallet_name)) {
warnings.emplace_back(Untranslated("Wallet load on startup setting could not be updated, so wallet may not be loaded next node startup."));
} else if (!load_on_startup.value() && !RemoveWalletSetting(chain, wallet_name)) {
warnings.emplace_back(Untranslated("Wallet load on startup setting could not be updated, so wallet may still be loaded next node startup."));
}
}
/**
* Refresh mempool status so the wallet is in an internally consistent state and
* immediately knows the transaction's status: Whether it can be considered
* trusted and is eligible to be abandoned ...
*/
static void RefreshMempoolStatus(CWalletTx& tx, interfaces::Chain& chain)
{
if (chain.isInMempool(tx.GetHash())) {
tx.m_state = TxStateInMempool();
} else if (tx.state<TxStateInMempool>()) {
tx.m_state = TxStateInactive();
}
}
bool AddWallet(WalletContext& context, const std::shared_ptr<CWallet>& wallet)
{
LOCK(context.wallets_mutex);
assert(wallet);
std::vector<std::shared_ptr<CWallet>>::const_iterator i = std::find(context.wallets.begin(), context.wallets.end(), wallet);
if (i != context.wallets.end()) return false;
context.wallets.push_back(wallet);
wallet->ConnectScriptPubKeyManNotifiers();
wallet->NotifyCanGetAddressesChanged();
return true;
}
bool RemoveWallet(WalletContext& context, const std::shared_ptr<CWallet>& wallet, std::optional<bool> load_on_start, std::vector<bilingual_str>& warnings)
{
assert(wallet);
interfaces::Chain& chain = wallet->chain();
std::string name = wallet->GetName();
// Unregister with the validation interface which also drops shared pointers.
wallet->m_chain_notifications_handler.reset();
{
LOCK(context.wallets_mutex);
std::vector<std::shared_ptr<CWallet>>::iterator i = std::find(context.wallets.begin(), context.wallets.end(), wallet);
if (i == context.wallets.end()) return false;
context.wallets.erase(i);
}
// Notify unload so that upper layers release the shared pointer.
wallet->NotifyUnload();
// Write the wallet setting
UpdateWalletSetting(chain, name, load_on_start, warnings);
return true;
}
bool RemoveWallet(WalletContext& context, const std::shared_ptr<CWallet>& wallet, std::optional<bool> load_on_start)
{
std::vector<bilingual_str> warnings;
return RemoveWallet(context, wallet, load_on_start, warnings);
}
std::vector<std::shared_ptr<CWallet>> GetWallets(WalletContext& context)
{
LOCK(context.wallets_mutex);
return context.wallets;
}
std::shared_ptr<CWallet> GetDefaultWallet(WalletContext& context, size_t& count)
{
LOCK(context.wallets_mutex);
count = context.wallets.size();
return count == 1 ? context.wallets[0] : nullptr;
}
std::shared_ptr<CWallet> GetWallet(WalletContext& context, const std::string& name)
{
LOCK(context.wallets_mutex);
for (const std::shared_ptr<CWallet>& wallet : context.wallets) {
if (wallet->GetName() == name) return wallet;
}
return nullptr;
}
std::unique_ptr<interfaces::Handler> HandleLoadWallet(WalletContext& context, LoadWalletFn load_wallet)
{
LOCK(context.wallets_mutex);
auto it = context.wallet_load_fns.emplace(context.wallet_load_fns.end(), std::move(load_wallet));
return interfaces::MakeCleanupHandler([&context, it] { LOCK(context.wallets_mutex); context.wallet_load_fns.erase(it); });
}
void NotifyWalletLoaded(WalletContext& context, const std::shared_ptr<CWallet>& wallet)
{
LOCK(context.wallets_mutex);
for (auto& load_wallet : context.wallet_load_fns) {
load_wallet(interfaces::MakeWallet(context, wallet));
}
}
static GlobalMutex g_loading_wallet_mutex;
static GlobalMutex g_wallet_release_mutex;
static std::condition_variable g_wallet_release_cv;
static std::set<std::string> g_loading_wallet_set GUARDED_BY(g_loading_wallet_mutex);
static std::set<std::string> g_unloading_wallet_set GUARDED_BY(g_wallet_release_mutex);
// Custom deleter for shared_ptr<CWallet>.
static void FlushAndDeleteWallet(CWallet* wallet)
{
const std::string name = wallet->GetName();
wallet->WalletLogPrintf("Releasing wallet %s..\n", name);
wallet->Flush();
delete wallet;
// Wallet is now released, notify WaitForDeleteWallet, if any.
{
LOCK(g_wallet_release_mutex);
if (g_unloading_wallet_set.erase(name) == 0) {
// WaitForDeleteWallet was not called for this wallet, all done.
return;
}
}
g_wallet_release_cv.notify_all();
}
void WaitForDeleteWallet(std::shared_ptr<CWallet>&& wallet)
{
// Mark wallet for unloading.
const std::string name = wallet->GetName();
{
LOCK(g_wallet_release_mutex);
g_unloading_wallet_set.insert(name);
// Do not expect to be the only one removing this wallet.
// Multiple threads could simultaneously be waiting for deletion.
}
// Time to ditch our shared_ptr and wait for FlushAndDeleteWallet call.
wallet.reset();
{
WAIT_LOCK(g_wallet_release_mutex, lock);
while (g_unloading_wallet_set.count(name) == 1) {
g_wallet_release_cv.wait(lock);
}
}
}
namespace {
std::shared_ptr<CWallet> LoadWalletInternal(WalletContext& context, const std::string& name, std::optional<bool> load_on_start, const DatabaseOptions& options, DatabaseStatus& status, bilingual_str& error, std::vector<bilingual_str>& warnings)
{
try {
std::unique_ptr<WalletDatabase> database = MakeWalletDatabase(name, options, status, error);
if (!database) {
error = Untranslated("Wallet file verification failed.") + Untranslated(" ") + error;
return nullptr;
}
context.chain->initMessage(_("Loading wallet…").translated);
std::shared_ptr<CWallet> wallet = CWallet::Create(context, name, std::move(database), options.create_flags, error, warnings);
if (!wallet) {
error = Untranslated("Wallet loading failed.") + Untranslated(" ") + error;
status = DatabaseStatus::FAILED_LOAD;
return nullptr;
}
// Legacy wallets are being deprecated, warn if the loaded wallet is legacy
if (!wallet->IsWalletFlagSet(WALLET_FLAG_DESCRIPTORS)) {
warnings.push_back(_("Wallet loaded successfully. The legacy wallet type is being deprecated and support for creating and opening legacy wallets will be removed in the future. Legacy wallets can be migrated to a descriptor wallet with migratewallet."));
}
NotifyWalletLoaded(context, wallet);
AddWallet(context, wallet);
wallet->postInitProcess();
// Write the wallet setting
UpdateWalletSetting(*context.chain, name, load_on_start, warnings);
return wallet;
} catch (const std::runtime_error& e) {
error = Untranslated(e.what());
status = DatabaseStatus::FAILED_LOAD;
return nullptr;
}
}
class FastWalletRescanFilter
{
public:
FastWalletRescanFilter(const CWallet& wallet) : m_wallet(wallet)
{
// fast rescanning via block filters is only supported by descriptor wallets right now
assert(!m_wallet.IsLegacy());
// create initial filter with scripts from all ScriptPubKeyMans
for (auto spkm : m_wallet.GetAllScriptPubKeyMans()) {
auto desc_spkm{dynamic_cast<DescriptorScriptPubKeyMan*>(spkm)};
assert(desc_spkm != nullptr);
AddScriptPubKeys(desc_spkm);
// save each range descriptor's end for possible future filter updates
if (desc_spkm->IsHDEnabled()) {
m_last_range_ends.emplace(desc_spkm->GetID(), desc_spkm->GetEndRange());
}
}
}
void UpdateIfNeeded()
{
// repopulate filter with new scripts if top-up has happened since last iteration
for (const auto& [desc_spkm_id, last_range_end] : m_last_range_ends) {
auto desc_spkm{dynamic_cast<DescriptorScriptPubKeyMan*>(m_wallet.GetScriptPubKeyMan(desc_spkm_id))};
assert(desc_spkm != nullptr);
int32_t current_range_end{desc_spkm->GetEndRange()};
if (current_range_end > last_range_end) {
AddScriptPubKeys(desc_spkm, last_range_end);
m_last_range_ends.at(desc_spkm->GetID()) = current_range_end;
}
}
}
std::optional<bool> MatchesBlock(const uint256& block_hash) const
{
return m_wallet.chain().blockFilterMatchesAny(BlockFilterType::BASIC, block_hash, m_filter_set);
}
private:
const CWallet& m_wallet;
/** Map for keeping track of each range descriptor's last seen end range.
* This information is used to detect whether new addresses were derived
* (that is, if the current end range is larger than the saved end range)
* after processing a block and hence a filter set update is needed to
* take possible keypool top-ups into account.
*/
std::map<uint256, int32_t> m_last_range_ends;
GCSFilter::ElementSet m_filter_set;
void AddScriptPubKeys(const DescriptorScriptPubKeyMan* desc_spkm, int32_t last_range_end = 0)
{
for (const auto& script_pub_key : desc_spkm->GetScriptPubKeys(last_range_end)) {
m_filter_set.emplace(script_pub_key.begin(), script_pub_key.end());
}
}
};
} // namespace
std::shared_ptr<CWallet> LoadWallet(WalletContext& context, const std::string& name, std::optional<bool> load_on_start, const DatabaseOptions& options, DatabaseStatus& status, bilingual_str& error, std::vector<bilingual_str>& warnings)
{
auto result = WITH_LOCK(g_loading_wallet_mutex, return g_loading_wallet_set.insert(name));
if (!result.second) {
error = Untranslated("Wallet already loading.");
status = DatabaseStatus::FAILED_LOAD;
return nullptr;
}
auto wallet = LoadWalletInternal(context, name, load_on_start, options, status, error, warnings);
WITH_LOCK(g_loading_wallet_mutex, g_loading_wallet_set.erase(result.first));
return wallet;
}
std::shared_ptr<CWallet> CreateWallet(WalletContext& context, const std::string& name, std::optional<bool> load_on_start, DatabaseOptions& options, DatabaseStatus& status, bilingual_str& error, std::vector<bilingual_str>& warnings)
{
uint64_t wallet_creation_flags = options.create_flags;
const SecureString& passphrase = options.create_passphrase;
ArgsManager& args = *Assert(context.args);
if (wallet_creation_flags & WALLET_FLAG_DESCRIPTORS) options.require_format = DatabaseFormat::SQLITE;
else if (args.GetBoolArg("-swapbdbendian", false)) {
options.require_format = DatabaseFormat::BERKELEY_SWAP;
}
// Indicate that the wallet is actually supposed to be blank and not just blank to make it encrypted
bool create_blank = (wallet_creation_flags & WALLET_FLAG_BLANK_WALLET);
// Born encrypted wallets need to be created blank first.
if (!passphrase.empty()) {
wallet_creation_flags |= WALLET_FLAG_BLANK_WALLET;
}
// Private keys must be disabled for an external signer wallet
if ((wallet_creation_flags & WALLET_FLAG_EXTERNAL_SIGNER) && !(wallet_creation_flags & WALLET_FLAG_DISABLE_PRIVATE_KEYS)) {
error = Untranslated("Private keys must be disabled when using an external signer");
status = DatabaseStatus::FAILED_CREATE;
return nullptr;
}
// Descriptor support must be enabled for an external signer wallet
if ((wallet_creation_flags & WALLET_FLAG_EXTERNAL_SIGNER) && !(wallet_creation_flags & WALLET_FLAG_DESCRIPTORS)) {
error = Untranslated("Descriptor support must be enabled when using an external signer");
status = DatabaseStatus::FAILED_CREATE;
return nullptr;
}
// Do not allow a passphrase when private keys are disabled
if (!passphrase.empty() && (wallet_creation_flags & WALLET_FLAG_DISABLE_PRIVATE_KEYS)) {
error = Untranslated("Passphrase provided but private keys are disabled. A passphrase is only used to encrypt private keys, so cannot be used for wallets with private keys disabled.");
status = DatabaseStatus::FAILED_CREATE;
return nullptr;
}
// Wallet::Verify will check if we're trying to create a wallet with a duplicate name.
std::unique_ptr<WalletDatabase> database = MakeWalletDatabase(name, options, status, error);
if (!database) {
error = Untranslated("Wallet file verification failed.") + Untranslated(" ") + error;
status = DatabaseStatus::FAILED_VERIFY;
return nullptr;
}
// Make the wallet
context.chain->initMessage(_("Loading wallet…").translated);
std::shared_ptr<CWallet> wallet = CWallet::Create(context, name, std::move(database), wallet_creation_flags, error, warnings);
if (!wallet) {
error = Untranslated("Wallet creation failed.") + Untranslated(" ") + error;
status = DatabaseStatus::FAILED_CREATE;
return nullptr;
}
// Encrypt the wallet
if (!passphrase.empty() && !(wallet_creation_flags & WALLET_FLAG_DISABLE_PRIVATE_KEYS)) {
if (!wallet->EncryptWallet(passphrase)) {
error = Untranslated("Error: Wallet created but failed to encrypt.");
status = DatabaseStatus::FAILED_ENCRYPT;
return nullptr;
}
if (!create_blank) {
// Unlock the wallet
if (!wallet->Unlock(passphrase)) {
error = Untranslated("Error: Wallet was encrypted but could not be unlocked");
status = DatabaseStatus::FAILED_ENCRYPT;
return nullptr;
}
// Set a seed for the wallet
{
LOCK(wallet->cs_wallet);
if (wallet->IsWalletFlagSet(WALLET_FLAG_DESCRIPTORS)) {
wallet->SetupDescriptorScriptPubKeyMans();
} else {
for (auto spk_man : wallet->GetActiveScriptPubKeyMans()) {
if (!spk_man->SetupGeneration()) {
error = Untranslated("Unable to generate initial keys");
status = DatabaseStatus::FAILED_CREATE;
return nullptr;
}
}
}
}
// Relock the wallet
wallet->Lock();
}
}
NotifyWalletLoaded(context, wallet);
AddWallet(context, wallet);
wallet->postInitProcess();
// Write the wallet settings
UpdateWalletSetting(*context.chain, name, load_on_start, warnings);
// Legacy wallets are being deprecated, warn if a newly created wallet is legacy
if (!(wallet_creation_flags & WALLET_FLAG_DESCRIPTORS)) {
warnings.push_back(_("Wallet created successfully. The legacy wallet type is being deprecated and support for creating and opening legacy wallets will be removed in the future."));
}
status = DatabaseStatus::SUCCESS;
return wallet;
}
std::shared_ptr<CWallet> RestoreWallet(WalletContext& context, const fs::path& backup_file, const std::string& wallet_name, std::optional<bool> load_on_start, DatabaseStatus& status, bilingual_str& error, std::vector<bilingual_str>& warnings)
{
DatabaseOptions options;
ReadDatabaseArgs(*context.args, options);
options.require_existing = true;
const fs::path wallet_path = fsbridge::AbsPathJoin(GetWalletDir(), fs::u8path(wallet_name));
auto wallet_file = wallet_path / "wallet.dat";
std::shared_ptr<CWallet> wallet;
try {
if (!fs::exists(backup_file)) {
error = Untranslated("Backup file does not exist");
status = DatabaseStatus::FAILED_INVALID_BACKUP_FILE;
return nullptr;
}
if (fs::exists(wallet_path) || !TryCreateDirectories(wallet_path)) {
error = Untranslated(strprintf("Failed to create database path '%s'. Database already exists.", fs::PathToString(wallet_path)));
status = DatabaseStatus::FAILED_ALREADY_EXISTS;
return nullptr;
}
fs::copy_file(backup_file, wallet_file, fs::copy_options::none);
wallet = LoadWallet(context, wallet_name, load_on_start, options, status, error, warnings);
} catch (const std::exception& e) {
assert(!wallet);
if (!error.empty()) error += Untranslated("\n");
error += strprintf(Untranslated("Unexpected exception: %s"), e.what());
}
if (!wallet) {
fs::remove_all(wallet_path);
}
return wallet;
}
/** @defgroup mapWallet
*
* @{
*/
const CWalletTx* CWallet::GetWalletTx(const uint256& hash) const
{
AssertLockHeld(cs_wallet);
const auto it = mapWallet.find(hash);
if (it == mapWallet.end())
return nullptr;
return &(it->second);
}
void CWallet::UpgradeKeyMetadata()
{
if (IsLocked() || IsWalletFlagSet(WALLET_FLAG_KEY_ORIGIN_METADATA)) {
return;
}
auto spk_man = GetLegacyScriptPubKeyMan();
if (!spk_man) {
return;
}
spk_man->UpgradeKeyMetadata();
SetWalletFlag(WALLET_FLAG_KEY_ORIGIN_METADATA);
}
void CWallet::UpgradeDescriptorCache()
{
if (!IsWalletFlagSet(WALLET_FLAG_DESCRIPTORS) || IsLocked() || IsWalletFlagSet(WALLET_FLAG_LAST_HARDENED_XPUB_CACHED)) {
return;
}
for (ScriptPubKeyMan* spkm : GetAllScriptPubKeyMans()) {
DescriptorScriptPubKeyMan* desc_spkm = dynamic_cast<DescriptorScriptPubKeyMan*>(spkm);
desc_spkm->UpgradeDescriptorCache();
}
SetWalletFlag(WALLET_FLAG_LAST_HARDENED_XPUB_CACHED);
}
bool CWallet::Unlock(const SecureString& strWalletPassphrase)
{
CCrypter crypter;
CKeyingMaterial _vMasterKey;
{
LOCK(cs_wallet);
for (const MasterKeyMap::value_type& pMasterKey : mapMasterKeys)
{
if(!crypter.SetKeyFromPassphrase(strWalletPassphrase, pMasterKey.second.vchSalt, pMasterKey.second.nDeriveIterations, pMasterKey.second.nDerivationMethod))
return false;
if (!crypter.Decrypt(pMasterKey.second.vchCryptedKey, _vMasterKey))
continue; // try another master key
if (Unlock(_vMasterKey)) {
// Now that we've unlocked, upgrade the key metadata
UpgradeKeyMetadata();
// Now that we've unlocked, upgrade the descriptor cache
UpgradeDescriptorCache();
return true;
}
}
}
return false;
}
bool CWallet::ChangeWalletPassphrase(const SecureString& strOldWalletPassphrase, const SecureString& strNewWalletPassphrase)
{
bool fWasLocked = IsLocked();
{
LOCK2(m_relock_mutex, cs_wallet);
Lock();
CCrypter crypter;
CKeyingMaterial _vMasterKey;
for (MasterKeyMap::value_type& pMasterKey : mapMasterKeys)
{
if(!crypter.SetKeyFromPassphrase(strOldWalletPassphrase, pMasterKey.second.vchSalt, pMasterKey.second.nDeriveIterations, pMasterKey.second.nDerivationMethod))
return false;
if (!crypter.Decrypt(pMasterKey.second.vchCryptedKey, _vMasterKey))
return false;
if (Unlock(_vMasterKey))
{
constexpr MillisecondsDouble target{100};
auto start{SteadyClock::now()};
crypter.SetKeyFromPassphrase(strNewWalletPassphrase, pMasterKey.second.vchSalt, pMasterKey.second.nDeriveIterations, pMasterKey.second.nDerivationMethod);
pMasterKey.second.nDeriveIterations = static_cast<unsigned int>(pMasterKey.second.nDeriveIterations * target / (SteadyClock::now() - start));
start = SteadyClock::now();
crypter.SetKeyFromPassphrase(strNewWalletPassphrase, pMasterKey.second.vchSalt, pMasterKey.second.nDeriveIterations, pMasterKey.second.nDerivationMethod);
pMasterKey.second.nDeriveIterations = (pMasterKey.second.nDeriveIterations + static_cast<unsigned int>(pMasterKey.second.nDeriveIterations * target / (SteadyClock::now() - start))) / 2;
if (pMasterKey.second.nDeriveIterations < 25000)
pMasterKey.second.nDeriveIterations = 25000;
WalletLogPrintf("Wallet passphrase changed to an nDeriveIterations of %i\n", pMasterKey.second.nDeriveIterations);
if (!crypter.SetKeyFromPassphrase(strNewWalletPassphrase, pMasterKey.second.vchSalt, pMasterKey.second.nDeriveIterations, pMasterKey.second.nDerivationMethod))
return false;
if (!crypter.Encrypt(_vMasterKey, pMasterKey.second.vchCryptedKey))
return false;
WalletBatch(GetDatabase()).WriteMasterKey(pMasterKey.first, pMasterKey.second);
if (fWasLocked)
Lock();
return true;
}
}
}
return false;
}
void CWallet::chainStateFlushed(ChainstateRole role, const CBlockLocator& loc)
{
// Don't update the best block until the chain is attached so that in case of a shutdown,
// the rescan will be restarted at next startup.
if (m_attaching_chain || role == ChainstateRole::BACKGROUND) {
return;
}
WalletBatch batch(GetDatabase());
batch.WriteBestBlock(loc);
}
void CWallet::SetMinVersion(enum WalletFeature nVersion, WalletBatch* batch_in)
{
LOCK(cs_wallet);
if (nWalletVersion >= nVersion)
return;
WalletLogPrintf("Setting minversion to %d\n", nVersion);
nWalletVersion = nVersion;
{
WalletBatch* batch = batch_in ? batch_in : new WalletBatch(GetDatabase());
if (nWalletVersion > 40000)
batch->WriteMinVersion(nWalletVersion);
if (!batch_in)
delete batch;
}
}
std::set<uint256> CWallet::GetConflicts(const uint256& txid) const
{
std::set<uint256> result;
AssertLockHeld(cs_wallet);
const auto it = mapWallet.find(txid);
if (it == mapWallet.end())
return result;
const CWalletTx& wtx = it->second;
std::pair<TxSpends::const_iterator, TxSpends::const_iterator> range;
for (const CTxIn& txin : wtx.tx->vin)
{
if (mapTxSpends.count(txin.prevout) <= 1)
continue; // No conflict if zero or one spends
range = mapTxSpends.equal_range(txin.prevout);
for (TxSpends::const_iterator _it = range.first; _it != range.second; ++_it)
result.insert(_it->second);
}
return result;
}
bool CWallet::HasWalletSpend(const CTransactionRef& tx) const
{
AssertLockHeld(cs_wallet);
const Txid& txid = tx->GetHash();
for (unsigned int i = 0; i < tx->vout.size(); ++i) {
if (IsSpent(COutPoint(txid, i))) {
return true;
}
}
return false;
}
void CWallet::Flush()
{
GetDatabase().Flush();
}
void CWallet::Close()
{
GetDatabase().Close();
}
void CWallet::SyncMetaData(std::pair<TxSpends::iterator, TxSpends::iterator> range)
{
// We want all the wallet transactions in range to have the same metadata as
// the oldest (smallest nOrderPos).
// So: find smallest nOrderPos:
int nMinOrderPos = std::numeric_limits<int>::max();
const CWalletTx* copyFrom = nullptr;
for (TxSpends::iterator it = range.first; it != range.second; ++it) {
const CWalletTx* wtx = &mapWallet.at(it->second);
if (wtx->nOrderPos < nMinOrderPos) {
nMinOrderPos = wtx->nOrderPos;
copyFrom = wtx;
}
}
if (!copyFrom) {
return;
}
// Now copy data from copyFrom to rest:
for (TxSpends::iterator it = range.first; it != range.second; ++it)
{
const uint256& hash = it->second;
CWalletTx* copyTo = &mapWallet.at(hash);
if (copyFrom == copyTo) continue;
assert(copyFrom && "Oldest wallet transaction in range assumed to have been found.");
if (!copyFrom->IsEquivalentTo(*copyTo)) continue;
copyTo->mapValue = copyFrom->mapValue;
copyTo->vOrderForm = copyFrom->vOrderForm;
// fTimeReceivedIsTxTime not copied on purpose
// nTimeReceived not copied on purpose
copyTo->nTimeSmart = copyFrom->nTimeSmart;
copyTo->fFromMe = copyFrom->fFromMe;
// nOrderPos not copied on purpose
// cached members not copied on purpose
}
}
/**
* Outpoint is spent if any non-conflicted transaction
* spends it:
*/
bool CWallet::IsSpent(const COutPoint& outpoint) const
{
std::pair<TxSpends::const_iterator, TxSpends::const_iterator> range;
range = mapTxSpends.equal_range(outpoint);
for (TxSpends::const_iterator it = range.first; it != range.second; ++it) {
const uint256& wtxid = it->second;
const auto mit = mapWallet.find(wtxid);
if (mit != mapWallet.end()) {
const auto& wtx = mit->second;
if (!wtx.isAbandoned() && !wtx.isBlockConflicted() && !wtx.isMempoolConflicted())
return true; // Spent
}
}
return false;
}
void CWallet::AddToSpends(const COutPoint& outpoint, const uint256& wtxid, WalletBatch* batch)
{
mapTxSpends.insert(std::make_pair(outpoint, wtxid));
if (batch) {
UnlockCoin(outpoint, batch);
} else {
WalletBatch temp_batch(GetDatabase());
UnlockCoin(outpoint, &temp_batch);
}
std::pair<TxSpends::iterator, TxSpends::iterator> range;
range = mapTxSpends.equal_range(outpoint);
SyncMetaData(range);
}
void CWallet::AddToSpends(const CWalletTx& wtx, WalletBatch* batch)
{
if (wtx.IsCoinBase()) // Coinbases don't spend anything!
return;
for (const CTxIn& txin : wtx.tx->vin)
AddToSpends(txin.prevout, wtx.GetHash(), batch);
}
bool CWallet::EncryptWallet(const SecureString& strWalletPassphrase)
{
if (IsCrypted())
return false;
CKeyingMaterial _vMasterKey;
_vMasterKey.resize(WALLET_CRYPTO_KEY_SIZE);
GetStrongRandBytes(_vMasterKey);
CMasterKey kMasterKey;
kMasterKey.vchSalt.resize(WALLET_CRYPTO_SALT_SIZE);
GetStrongRandBytes(kMasterKey.vchSalt);
CCrypter crypter;
constexpr MillisecondsDouble target{100};
auto start{SteadyClock::now()};
crypter.SetKeyFromPassphrase(strWalletPassphrase, kMasterKey.vchSalt, 25000, kMasterKey.nDerivationMethod);
kMasterKey.nDeriveIterations = static_cast<unsigned int>(25000 * target / (SteadyClock::now() - start));
start = SteadyClock::now();
crypter.SetKeyFromPassphrase(strWalletPassphrase, kMasterKey.vchSalt, kMasterKey.nDeriveIterations, kMasterKey.nDerivationMethod);
kMasterKey.nDeriveIterations = (kMasterKey.nDeriveIterations + static_cast<unsigned int>(kMasterKey.nDeriveIterations * target / (SteadyClock::now() - start))) / 2;
if (kMasterKey.nDeriveIterations < 25000)
kMasterKey.nDeriveIterations = 25000;
WalletLogPrintf("Encrypting Wallet with an nDeriveIterations of %i\n", kMasterKey.nDeriveIterations);
if (!crypter.SetKeyFromPassphrase(strWalletPassphrase, kMasterKey.vchSalt, kMasterKey.nDeriveIterations, kMasterKey.nDerivationMethod))
return false;
if (!crypter.Encrypt(_vMasterKey, kMasterKey.vchCryptedKey))
return false;
{
LOCK2(m_relock_mutex, cs_wallet);
mapMasterKeys[++nMasterKeyMaxID] = kMasterKey;
WalletBatch* encrypted_batch = new WalletBatch(GetDatabase());
if (!encrypted_batch->TxnBegin()) {
delete encrypted_batch;
encrypted_batch = nullptr;
return false;
}
encrypted_batch->WriteMasterKey(nMasterKeyMaxID, kMasterKey);
for (const auto& spk_man_pair : m_spk_managers) {
auto spk_man = spk_man_pair.second.get();
if (!spk_man->Encrypt(_vMasterKey, encrypted_batch)) {
encrypted_batch->TxnAbort();
delete encrypted_batch;
encrypted_batch = nullptr;
// We now probably have half of our keys encrypted in memory, and half not...
// die and let the user reload the unencrypted wallet.
assert(false);
}
}
// Encryption was introduced in version 0.4.0
SetMinVersion(FEATURE_WALLETCRYPT, encrypted_batch);
if (!encrypted_batch->TxnCommit()) {
delete encrypted_batch;
encrypted_batch = nullptr;
// We now have keys encrypted in memory, but not on disk...
// die to avoid confusion and let the user reload the unencrypted wallet.
assert(false);
}
delete encrypted_batch;
encrypted_batch = nullptr;
Lock();
Unlock(strWalletPassphrase);
// If we are using descriptors, make new descriptors with a new seed
if (IsWalletFlagSet(WALLET_FLAG_DESCRIPTORS) && !IsWalletFlagSet(WALLET_FLAG_BLANK_WALLET)) {
SetupDescriptorScriptPubKeyMans();
} else if (auto spk_man = GetLegacyScriptPubKeyMan()) {
// if we are using HD, replace the HD seed with a new one
if (spk_man->IsHDEnabled()) {
if (!spk_man->SetupGeneration(true)) {
return false;
}
}
}
Lock();
// Need to completely rewrite the wallet file; if we don't, bdb might keep
// bits of the unencrypted private key in slack space in the database file.
GetDatabase().Rewrite();
// BDB seems to have a bad habit of writing old data into
// slack space in .dat files; that is bad if the old data is
// unencrypted private keys. So:
GetDatabase().ReloadDbEnv();
}
NotifyStatusChanged(this);
return true;
}
DBErrors CWallet::ReorderTransactions()
{
LOCK(cs_wallet);
WalletBatch batch(GetDatabase());
// Old wallets didn't have any defined order for transactions
// Probably a bad idea to change the output of this
// First: get all CWalletTx into a sorted-by-time multimap.
typedef std::multimap<int64_t, CWalletTx*> TxItems;
TxItems txByTime;
for (auto& entry : mapWallet)
{
CWalletTx* wtx = &entry.second;
txByTime.insert(std::make_pair(wtx->nTimeReceived, wtx));
}
nOrderPosNext = 0;
std::vector<int64_t> nOrderPosOffsets;
for (TxItems::iterator it = txByTime.begin(); it != txByTime.end(); ++it)
{
CWalletTx *const pwtx = (*it).second;
int64_t& nOrderPos = pwtx->nOrderPos;
if (nOrderPos == -1)
{
nOrderPos = nOrderPosNext++;
nOrderPosOffsets.push_back(nOrderPos);
if (!batch.WriteTx(*pwtx))
return DBErrors::LOAD_FAIL;
}
else
{
int64_t nOrderPosOff = 0;
for (const int64_t& nOffsetStart : nOrderPosOffsets)
{
if (nOrderPos >= nOffsetStart)
++nOrderPosOff;
}
nOrderPos += nOrderPosOff;
nOrderPosNext = std::max(nOrderPosNext, nOrderPos + 1);
if (!nOrderPosOff)
continue;
// Since we're changing the order, write it back
if (!batch.WriteTx(*pwtx))
return DBErrors::LOAD_FAIL;
}
}
batch.WriteOrderPosNext(nOrderPosNext);
return DBErrors::LOAD_OK;
}
int64_t CWallet::IncOrderPosNext(WalletBatch* batch)
{
AssertLockHeld(cs_wallet);
int64_t nRet = nOrderPosNext++;
if (batch) {
batch->WriteOrderPosNext(nOrderPosNext);
} else {
WalletBatch(GetDatabase()).WriteOrderPosNext(nOrderPosNext);
}
return nRet;
}
void CWallet::MarkDirty()
{
{
LOCK(cs_wallet);
for (std::pair<const uint256, CWalletTx>& item : mapWallet)
item.second.MarkDirty();
}
}
bool CWallet::MarkReplaced(const uint256& originalHash, const uint256& newHash)
{
LOCK(cs_wallet);
auto mi = mapWallet.find(originalHash);
// There is a bug if MarkReplaced is not called on an existing wallet transaction.
assert(mi != mapWallet.end());
CWalletTx& wtx = (*mi).second;
// Ensure for now that we're not overwriting data
assert(wtx.mapValue.count("replaced_by_txid") == 0);
wtx.mapValue["replaced_by_txid"] = newHash.ToString();