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BRWallet.c
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BRWallet.c
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//
// BRWallet.c
//
// Created by Aaron Voisine on 9/1/15.
// Copyright (c) 2015 breadwallet LLC
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
#include "BRWallet.h"
#include "BRSet.h"
#include "BRAddress.h"
#include "BRArray.h"
#include <stdlib.h>
#include <inttypes.h>
#include <limits.h>
#include <float.h>
#include <pthread.h>
#include <assert.h>
struct BRWalletStruct {
uint64_t balance, totalSent, totalReceived, feePerKb, *balanceHist;
uint32_t blockHeight;
BRUTXO *utxos;
BRTransaction **transactions;
BRMasterPubKey masterPubKey;
BRAddress *internalChain, *externalChain;
BRSet *allTx, *invalidTx, *pendingTx, *spentOutputs, *usedAddrs, *allAddrs;
void *callbackInfo;
void (*balanceChanged)(void *info, uint64_t balance);
void (*txAdded)(void *info, BRTransaction *tx);
void (*txUpdated)(void *info, const UInt256 txHashes[], size_t txCount, uint32_t blockHeight, uint32_t timestamp);
void (*txDeleted)(void *info, UInt256 txHash, int notifyUser, int recommendRescan);
pthread_mutex_t lock;
};
inline static uint64_t _txFee(uint64_t feePerKb, size_t size)
{
uint64_t standardFee = ((size + 999)/1000)*TX_FEE_PER_KB, // standard fee based on tx size rounded up to nearest kb
fee = (((size*feePerKb/1000) + 99)/100)*100; // fee using feePerKb, rounded up to nearest 100 satoshi
return (fee > standardFee) ? fee : standardFee;
}
// chain position of first tx output address that appears in chain
inline static size_t _txChainIndex(const BRTransaction *tx, const BRAddress *addrChain)
{
for (size_t i = array_count(addrChain); i > 0; i--) {
for (size_t j = 0; j < tx->outCount; j++) {
if (BRAddressEq(tx->outputs[j].address, &addrChain[i - 1])) return i - 1;
}
}
return SIZE_MAX;
}
inline static int _BRWalletTxIsAscending(BRWallet *wallet, const BRTransaction *tx1, const BRTransaction *tx2)
{
if (! tx1 || ! tx2) return 0;
if (tx1->blockHeight > tx2->blockHeight) return 1;
if (tx1->blockHeight < tx2->blockHeight) return 0;
for (size_t i = 0; i < tx1->inCount; i++) {
if (UInt256Eq(tx1->inputs[i].txHash, tx2->txHash)) return 1;
}
for (size_t i = 0; i < tx2->inCount; i++) {
if (UInt256Eq(tx2->inputs[i].txHash, tx1->txHash)) return 0;
}
for (size_t i = 0; i < tx1->inCount; i++) {
if (_BRWalletTxIsAscending(wallet, BRSetGet(wallet->allTx, &(tx1->inputs[i].txHash)), tx2)) return 1;
}
return 0;
}
inline static int _BRWalletTxCompare(BRWallet *wallet, const BRTransaction *tx1, const BRTransaction *tx2)
{
size_t i, j;
if (_BRWalletTxIsAscending(wallet, tx1, tx2)) return 1;
if (_BRWalletTxIsAscending(wallet, tx2, tx1)) return -1;
i = _txChainIndex(tx1, wallet->internalChain);
j = _txChainIndex(tx2, (i == SIZE_MAX) ? wallet->externalChain : wallet->internalChain);
if (i == SIZE_MAX && j != SIZE_MAX) i = _txChainIndex((BRTransaction *)tx1, wallet->externalChain);
if (i != SIZE_MAX && j != SIZE_MAX && i != j) return (i > j) ? 1 : -1;
return 0;
}
// inserts tx into wallet->transactions, keeping wallet->transactions sorted by date, oldest first (insertion sort)
inline static void _BRWalletInsertTx(BRWallet *wallet, BRTransaction *tx)
{
size_t i = array_count(wallet->transactions);
array_set_count(wallet->transactions, i + 1);
while (i > 0 && _BRWalletTxCompare(wallet, wallet->transactions[i - 1], tx) > 0) {
wallet->transactions[i] = wallet->transactions[i - 1];
i--;
}
wallet->transactions[i] = tx;
}
// non-threadsafe version of BRWalletContainsTransaction()
static int _BRWalletContainsTx(BRWallet *wallet, const BRTransaction *tx)
{
int r = 0;
for (size_t i = 0; ! r && i < tx->outCount; i++) {
if (BRSetContains(wallet->allAddrs, tx->outputs[i].address)) r = 1;
}
for (size_t i = 0; ! r && i < tx->inCount; i++) {
BRTransaction *t = BRSetGet(wallet->allTx, &tx->inputs[i].txHash);
uint32_t n = tx->inputs[i].index;
if (t && n < t->outCount && BRSetContains(wallet->allAddrs, t->outputs[n].address)) r = 1;
}
return r;
}
static void _BRWalletUpdateBalance(BRWallet *wallet)
{
int isInvalid, isPending;
uint64_t balance = 0, prevBalance = 0;
time_t now = time(NULL);
size_t i, j;
BRTransaction *tx, *t;
array_clear(wallet->utxos);
array_clear(wallet->balanceHist);
BRSetClear(wallet->spentOutputs);
BRSetClear(wallet->invalidTx);
BRSetClear(wallet->pendingTx);
BRSetClear(wallet->usedAddrs);
wallet->totalSent = 0;
wallet->totalReceived = 0;
for (i = 0; i < array_count(wallet->transactions); i++) {
tx = wallet->transactions[i];
// check if any inputs are invalid or already spent
if (tx->blockHeight == TX_UNCONFIRMED) {
for (j = 0, isInvalid = 0; ! isInvalid && j < tx->inCount; j++) {
if (BRSetContains(wallet->spentOutputs, &tx->inputs[j]) ||
BRSetContains(wallet->invalidTx, &tx->inputs[j].txHash)) isInvalid = 1;
}
if (isInvalid) {
BRSetAdd(wallet->invalidTx, tx);
array_add(wallet->balanceHist, balance);
continue;
}
}
// add inputs to spent output set
for (j = 0; j < tx->inCount; j++) {
BRSetAdd(wallet->spentOutputs, &tx->inputs[j]);
}
// check if tx is pending
if (tx->blockHeight == TX_UNCONFIRMED) {
isPending = (BRTransactionSize(tx) > TX_MAX_SIZE) ? 1 : 0; // check tx size is under TX_MAX_SIZE
for (j = 0; ! isPending && j < tx->outCount; j++) {
if (tx->outputs[j].amount < TX_MIN_OUTPUT_AMOUNT) isPending = 1; // check that no outputs are dust
}
for (j = 0; ! isPending && j < tx->inCount; j++) {
if (tx->inputs[j].sequence < UINT32_MAX - 1) isPending = 1; // check for replace-by-fee
if (tx->inputs[j].sequence < UINT32_MAX && tx->lockTime < TX_MAX_LOCK_HEIGHT &&
tx->lockTime > wallet->blockHeight + 1) isPending = 1; // future lockTime
if (tx->inputs[j].sequence < UINT32_MAX && tx->lockTime > now) isPending = 1; // future lockTime
if (BRSetContains(wallet->pendingTx, &tx->inputs[j].txHash)) isPending = 1; // check for pending inputs
// TODO: XXX handle BIP68 check lock time verify rules
}
if (isPending) {
BRSetAdd(wallet->pendingTx, tx);
array_add(wallet->balanceHist, balance);
continue;
}
}
// add outputs to UTXO set
// TODO: don't add outputs below TX_MIN_OUTPUT_AMOUNT
// TODO: don't add coin generation outputs < 100 blocks deep
// NOTE: balance/UTXOs will then need to be recalculated when last block changes
for (j = 0; j < tx->outCount; j++) {
if (tx->outputs[j].address[0] != '\0') {
BRSetAdd(wallet->usedAddrs, tx->outputs[j].address);
if (BRSetContains(wallet->allAddrs, tx->outputs[j].address)) {
array_add(wallet->utxos, ((BRUTXO) { tx->txHash, (uint32_t)j }));
balance += tx->outputs[j].amount;
}
}
}
// transaction ordering is not guaranteed, so check the entire UTXO set against the entire spent output set
for (j = array_count(wallet->utxos); j > 0; j--) {
if (! BRSetContains(wallet->spentOutputs, &wallet->utxos[j - 1])) continue;
t = BRSetGet(wallet->allTx, &wallet->utxos[j - 1].hash);
balance -= t->outputs[wallet->utxos[j - 1].n].amount;
array_rm(wallet->utxos, j - 1);
}
if (prevBalance < balance) wallet->totalReceived += balance - prevBalance;
if (balance < prevBalance) wallet->totalSent += prevBalance - balance;
array_add(wallet->balanceHist, balance);
prevBalance = balance;
}
assert(array_count(wallet->balanceHist) == array_count(wallet->transactions));
wallet->balance = balance;
}
// allocates and populates a BRWallet struct which must be freed by calling BRWalletFree()
BRWallet *BRWalletNew(BRTransaction *transactions[], size_t txCount, BRMasterPubKey mpk)
{
BRWallet *wallet = NULL;
BRTransaction *tx;
assert(transactions != NULL || txCount == 0);
wallet = calloc(1, sizeof(*wallet));
assert(wallet != NULL);
array_new(wallet->utxos, 100);
array_new(wallet->transactions, txCount + 100);
wallet->feePerKb = DEFAULT_FEE_PER_KB;
wallet->masterPubKey = mpk;
array_new(wallet->internalChain, 100);
array_new(wallet->externalChain, 100);
array_new(wallet->balanceHist, txCount + 100);
wallet->allTx = BRSetNew(BRTransactionHash, BRTransactionEq, txCount + 100);
wallet->invalidTx = BRSetNew(BRTransactionHash, BRTransactionEq, 10);
wallet->pendingTx = BRSetNew(BRTransactionHash, BRTransactionEq, 10);
wallet->spentOutputs = BRSetNew(BRUTXOHash, BRUTXOEq, txCount + 100);
wallet->usedAddrs = BRSetNew(BRAddressHash, BRAddressEq, txCount + 100);
wallet->allAddrs = BRSetNew(BRAddressHash, BRAddressEq, txCount + 100);
pthread_mutex_init(&wallet->lock, NULL);
for (size_t i = 0; transactions && i < txCount; i++) {
tx = transactions[i];
if (! BRTransactionIsSigned(tx) || BRSetContains(wallet->allTx, tx)) continue;
BRSetAdd(wallet->allTx, tx);
_BRWalletInsertTx(wallet, tx);
for (size_t j = 0; j < tx->outCount; j++) {
if (tx->outputs[j].address[0] != '\0') BRSetAdd(wallet->usedAddrs, tx->outputs[j].address);
}
}
BRWalletUnusedAddrs(wallet, NULL, SEQUENCE_GAP_LIMIT_EXTERNAL, 0);
BRWalletUnusedAddrs(wallet, NULL, SEQUENCE_GAP_LIMIT_INTERNAL, 1);
_BRWalletUpdateBalance(wallet);
if (txCount > 0 && ! _BRWalletContainsTx(wallet, transactions[0])) { // verify transactions match master pubKey
BRWalletFree(wallet);
wallet = NULL;
}
return wallet;
}
// not thread-safe, set callbacks once after BRWalletNew(), before calling other BRWallet functions
// info is a void pointer that will be passed along with each callback call
// void balanceChanged(void *, uint64_t) - called when the wallet balance changes
// void txAdded(void *, BRTransaction *) - called when transaction is added to the wallet
// void txUpdated(void *, const UInt256[], size_t, uint32_t, uint32_t)
// - called when the blockHeight or timestamp of previously added transactions are updated
// void txDeleted(void *, UInt256) - called when a previously added transaction is removed from the wallet
// NOTE: if a transaction is deleted, and BRWalletAmountSentByTx() is greater than 0, recommend the user do a rescan
void BRWalletSetCallbacks(BRWallet *wallet, void *info,
void (*balanceChanged)(void *info, uint64_t balance),
void (*txAdded)(void *info, BRTransaction *tx),
void (*txUpdated)(void *info, const UInt256 txHashes[], size_t txCount, uint32_t blockHeight,
uint32_t timestamp),
void (*txDeleted)(void *info, UInt256 txHash, int notifyUser, int recommendRescan))
{
assert(wallet != NULL);
wallet->callbackInfo = info;
wallet->balanceChanged = balanceChanged;
wallet->txAdded = txAdded;
wallet->txUpdated = txUpdated;
wallet->txDeleted = txDeleted;
}
// wallets are composed of chains of addresses
// each chain is traversed until a gap of a number of addresses is found that haven't been used in any transactions
// this function writes to addrs an array of <gapLimit> unused addresses following the last used address in the chain
// the internal chain is used for change addresses and the external chain for receive addresses
// addrs may be NULL to only generate addresses for BRWalletContainsAddress()
// returns the number addresses written to addrs
size_t BRWalletUnusedAddrs(BRWallet *wallet, BRAddress addrs[], uint32_t gapLimit, int internal)
{
BRAddress *addrChain;
size_t i, j = 0, count, startCount;
uint32_t chain = (internal) ? SEQUENCE_INTERNAL_CHAIN : SEQUENCE_EXTERNAL_CHAIN;
assert(wallet != NULL);
assert(gapLimit > 0);
pthread_mutex_lock(&wallet->lock);
addrChain = (internal) ? wallet->internalChain : wallet->externalChain;
i = count = startCount = array_count(addrChain);
// keep only the trailing contiguous block of addresses with no transactions
while (i > 0 && ! BRSetContains(wallet->usedAddrs, &addrChain[i - 1])) i--;
while (i + gapLimit > count) { // generate new addresses up to gapLimit
BRKey key;
BRAddress address = BR_ADDRESS_NONE;
uint8_t pubKey[BRBIP32PubKey(NULL, 0, wallet->masterPubKey, chain, count)];
size_t len = BRBIP32PubKey(pubKey, sizeof(pubKey), wallet->masterPubKey, chain, (uint32_t)count);
if (! BRKeySetPubKey(&key, pubKey, len)) break;
if (! BRKeyAddress(&key, address.s, sizeof(address)) || BRAddressEq(&address, &BR_ADDRESS_NONE)) break;
array_add(addrChain, address);
count++;
if (BRSetContains(wallet->usedAddrs, &address)) i = count;
}
if (addrs && i + gapLimit <= count) {
for (j = 0; j < gapLimit; j++) {
addrs[j] = addrChain[i + j];
}
}
// was addrChain moved to a new memory location?
if (addrChain == (internal ? wallet->internalChain : wallet->externalChain)) {
for (i = startCount; i < count; i++) {
BRSetAdd(wallet->allAddrs, &addrChain[i]);
}
}
else {
if (internal) wallet->internalChain = addrChain;
if (! internal) wallet->externalChain = addrChain;
BRSetClear(wallet->allAddrs); // clear and rebuild allAddrs
for (i = array_count(wallet->internalChain); i > 0; i--) {
BRSetAdd(wallet->allAddrs, &wallet->internalChain[i - 1]);
}
for (i = array_count(wallet->externalChain); i > 0; i--) {
BRSetAdd(wallet->allAddrs, &wallet->externalChain[i - 1]);
}
}
pthread_mutex_unlock(&wallet->lock);
return j;
}
// current wallet balance, not including transactions known to be invalid
uint64_t BRWalletBalance(BRWallet *wallet)
{
uint64_t balance;
assert(wallet != NULL);
pthread_mutex_lock(&wallet->lock);
balance = wallet->balance;
pthread_mutex_unlock(&wallet->lock);
return balance;
}
// writes unspent outputs to utxos and returns the number of outputs written, or total number available if utxos is NULL
size_t BRWalletUTXOs(BRWallet *wallet, BRUTXO *utxos, size_t utxosCount)
{
assert(wallet != NULL);
pthread_mutex_lock(&wallet->lock);
if (! utxos || array_count(wallet->utxos) < utxosCount) utxosCount = array_count(wallet->utxos);
for (size_t i = 0; utxos && i < utxosCount; i++) {
utxos[i] = wallet->utxos[i];
}
pthread_mutex_unlock(&wallet->lock);
return utxosCount;
}
// writes transactions registered in the wallet, sorted by date, oldest first, to the given transactions array
// returns the number of transactions written, or total number available if transactions is NULL
size_t BRWalletTransactions(BRWallet *wallet, BRTransaction *transactions[], size_t txCount)
{
assert(wallet != NULL);
pthread_mutex_lock(&wallet->lock);
if (! transactions || array_count(wallet->transactions) < txCount) txCount = array_count(wallet->transactions);
for (size_t i = 0; transactions && i < txCount; i++) {
transactions[i] = wallet->transactions[i];
}
pthread_mutex_unlock(&wallet->lock);
return txCount;
}
// writes transactions registered in the wallet, and that were unconfirmed before blockHeight, to the transactions array
// returns the number of transactions written, or total number available if transactions is NULL
size_t BRWalletTxUnconfirmedBefore(BRWallet *wallet, BRTransaction *transactions[], size_t txCount,
uint32_t blockHeight)
{
size_t total, n = 0;
assert(wallet != NULL);
pthread_mutex_lock(&wallet->lock);
total = array_count(wallet->transactions);
while (n < total && wallet->transactions[(total - n) - 1]->blockHeight >= blockHeight) n++;
if (! transactions || n < txCount) txCount = n;
for (size_t i = 0; transactions && i < txCount; i++) {
transactions[i] = wallet->transactions[(total - n) + i];
}
pthread_mutex_unlock(&wallet->lock);
return txCount;
}
// total amount spent from the wallet (exluding change)
uint64_t BRWalletTotalSent(BRWallet *wallet)
{
uint64_t totalSent;
assert(wallet != NULL);
pthread_mutex_lock(&wallet->lock);
totalSent = wallet->totalSent;
pthread_mutex_unlock(&wallet->lock);
return totalSent;
}
// total amount received by the wallet (exluding change)
uint64_t BRWalletTotalReceived(BRWallet *wallet)
{
uint64_t totalReceived;
assert(wallet != NULL);
pthread_mutex_lock(&wallet->lock);
totalReceived = wallet->totalReceived;
pthread_mutex_unlock(&wallet->lock);
return totalReceived;
}
// fee-per-kb of transaction size to use when creating a transaction
uint64_t BRWalletFeePerKb(BRWallet *wallet)
{
uint64_t feePerKb;
assert(wallet != NULL);
pthread_mutex_lock(&wallet->lock);
feePerKb = wallet->feePerKb;
pthread_mutex_unlock(&wallet->lock);
return feePerKb;
}
void BRWalletSetFeePerKb(BRWallet *wallet, uint64_t feePerKb)
{
assert(wallet != NULL);
pthread_mutex_lock(&wallet->lock);
wallet->feePerKb = feePerKb;
pthread_mutex_unlock(&wallet->lock);
}
// returns the first unused external address
BRAddress BRWalletReceiveAddress(BRWallet *wallet)
{
BRAddress addr = BR_ADDRESS_NONE;
BRWalletUnusedAddrs(wallet, &addr, 1, 0);
return addr;
}
// writes all addresses previously genereated with BRWalletUnusedAddrs() to addrs
// returns the number addresses written, or total number available if addrs is NULL
size_t BRWalletAllAddrs(BRWallet *wallet, BRAddress addrs[], size_t addrsCount)
{
size_t i, internalCount = 0, externalCount = 0;
assert(wallet != NULL);
pthread_mutex_lock(&wallet->lock);
internalCount = (! addrs || array_count(wallet->internalChain) < addrsCount) ?
array_count(wallet->internalChain) : addrsCount;
for (i = 0; addrs && i < internalCount; i++) {
addrs[i] = wallet->internalChain[i];
}
externalCount = (! addrs || array_count(wallet->externalChain) < addrsCount - internalCount) ?
array_count(wallet->externalChain) : addrsCount - internalCount;
for (i = 0; addrs && i < externalCount; i++) {
addrs[internalCount + i] = wallet->externalChain[i];
}
pthread_mutex_unlock(&wallet->lock);
return internalCount + externalCount;
}
// true if the address was previously generated by BRWalletUnusedAddrs() (even if it's now used)
int BRWalletContainsAddress(BRWallet *wallet, const char *addr)
{
int r = 0;
assert(wallet != NULL);
assert(addr != NULL);
pthread_mutex_lock(&wallet->lock);
if (addr) r = BRSetContains(wallet->allAddrs, addr);
pthread_mutex_unlock(&wallet->lock);
return r;
}
// true if the address was previously used as an output in any wallet transaction
int BRWalletAddressIsUsed(BRWallet *wallet, const char *addr)
{
int r = 0;
assert(wallet != NULL);
assert(addr != NULL);
pthread_mutex_lock(&wallet->lock);
if (addr) r = BRSetContains(wallet->usedAddrs, addr);
pthread_mutex_unlock(&wallet->lock);
return r;
}
// returns an unsigned transaction that sends the specified amount from the wallet to the given address
// result must be freed by calling BRTransactionFree()
BRTransaction *BRWalletCreateTransaction(BRWallet *wallet, uint64_t amount, const char *addr)
{
BRTxOutput o = BR_TX_OUTPUT_NONE;
assert(wallet != NULL);
assert(amount > 0);
assert(addr != NULL && BRAddressIsValid(addr));
o.amount = amount;
BRTxOutputSetAddress(&o, addr);
return BRWalletCreateTxForOutputs(wallet, &o, 1);
}
// returns an unsigned transaction that sends the specified amount from the wallet to the given address
// result must be freed by calling BRTransactionFree()
BRTransaction *BRWalletCreateOpsTransaction(BRWallet *wallet,
uint64_t amount,
const char *addr,
uint64_t opsFee,
const char *opsAddr) {
BRTxOutput mainOutput = BR_TX_OUTPUT_NONE;
BRTxOutput opsOutput = BR_TX_OUTPUT_NONE;
assert(wallet != NULL);
assert(amount > 0);
assert(addr != NULL && BRAddressIsValid(addr));
mainOutput.amount = amount;
BRTxOutputSetAddress(&mainOutput, addr);
assert(wallet != NULL);
assert(opsFee > 0);
assert(opsAddr != NULL && BRAddressIsValid(opsAddr));
opsOutput.amount = opsFee;
BRTxOutputSetAddress(&opsOutput, opsAddr);
BRTxOutput outputs[2];
outputs[0] = opsOutput;
outputs[1] = mainOutput;
return BRWalletCreateTxForOutputs(wallet, outputs, 2);
}
/// Description:
/// returns an unsigned transaction that satisifes the given transaction outputs
/// result must be freed by calling BRTransactionFree()
/// Parameters
/// returns Transaction
BRTransaction *BRWalletCreateTxForOutputs(BRWallet *wallet, const BRTxOutput outputs[], size_t outCount)
{
BRTransaction *tx, *transaction = BRTransactionNew();
uint64_t feeAmount, amount = 0, balance = 0, minAmount;
size_t i, j, cpfpSize = 0;
BRUTXO *o;
BRAddress addr = BR_ADDRESS_NONE;
assert(wallet != NULL);
assert(outputs != NULL && outCount > 0);
for (i = 0; outputs && i < outCount; i++) {
assert(outputs[i].script != NULL && outputs[i].scriptLen > 0);
BRTransactionAddOutput(transaction, outputs[i].amount, outputs[i].script, outputs[i].scriptLen);
amount += outputs[i].amount;
}
minAmount = BRWalletMinOutputAmount(wallet);
pthread_mutex_lock(&wallet->lock);
feeAmount = _txFee(wallet->feePerKb, BRTransactionSize(transaction) + TX_OUTPUT_SIZE);
// TODO: use up all UTXOs for all used addresses to avoid leaving funds in addresses whose public key is revealed
// TODO: avoid combining addresses in a single transaction when possible to reduce information leakage
// TODO: use up UTXOs received from any of the output scripts that this transaction sends funds to, to mitigate an
// attacker double spending and requesting a refund
for (i = 0; i < array_count(wallet->utxos); i++) {
o = &wallet->utxos[i];
tx = BRSetGet(wallet->allTx, o);
if (! tx || o->n >= tx->outCount) continue;
BRTransactionAddInput(transaction, tx->txHash, o->n, tx->outputs[o->n].amount,
tx->outputs[o->n].script, tx->outputs[o->n].scriptLen, NULL, 0, TXIN_SEQUENCE);
if (BRTransactionSize(transaction) + TX_OUTPUT_SIZE > TX_MAX_SIZE) { // transaction size-in-bytes too large
BRTransactionFree(transaction);
transaction = NULL;
// check for sufficient total funds before building a smaller transaction
if (wallet->balance < amount + _txFee(wallet->feePerKb, 10 + array_count(wallet->utxos)*TX_INPUT_SIZE +
(outCount + 1)*TX_OUTPUT_SIZE + cpfpSize)) break;
pthread_mutex_unlock(&wallet->lock);
if (outputs[outCount - 1].amount > amount + feeAmount + minAmount - balance) {
BRTxOutput newOutputs[outCount];
for (j = 0; j < outCount; j++) {
newOutputs[j] = outputs[j];
}
newOutputs[outCount - 1].amount -= amount + feeAmount - balance; // reduce last output amount
transaction = BRWalletCreateTxForOutputs(wallet, newOutputs, outCount);
}
else transaction = BRWalletCreateTxForOutputs(wallet, outputs, outCount - 1); // remove last output
balance = amount = feeAmount = 0;
pthread_mutex_lock(&wallet->lock);
break;
}
balance += tx->outputs[o->n].amount;
// // size of unconfirmed, non-change inputs for child-pays-for-parent fee
// // don't include parent tx with more than 10 inputs or 10 outputs
// if (tx->blockHeight == TX_UNCONFIRMED && tx->inCount <= 10 && tx->outCount <= 10 &&
// ! _BRWalletTxIsSend(wallet, tx)) cpfpSize += BRTransactionSize(tx);
// fee amount after adding a change output
feeAmount = _txFee(wallet->feePerKb, BRTransactionSize(transaction) + TX_OUTPUT_SIZE + cpfpSize);
// increase fee to round off remaining wallet balance to nearest 100 satoshi
if (wallet->balance > amount + feeAmount) feeAmount += (wallet->balance - (amount + feeAmount)) % 100;
if (balance == amount + feeAmount || balance >= amount + feeAmount + minAmount) break;
}
pthread_mutex_unlock(&wallet->lock);
if (transaction && (outCount < 1 || balance < amount + feeAmount)) { // no outputs/insufficient funds
BRTransactionFree(transaction);
transaction = NULL;
}
else if (transaction && balance - (amount + feeAmount) > minAmount) { // add change output
BRWalletUnusedAddrs(wallet, &addr, 1, 1);
uint8_t script[BRAddressScriptPubKey(NULL, 0, addr.s)];
size_t scriptLen = BRAddressScriptPubKey(script, sizeof(script), addr.s);
BRTransactionAddOutput(transaction, balance - (amount + feeAmount), script, scriptLen);
BRTransactionShuffleOutputs(transaction);
}
return transaction;
}
// signs any inputs in tx that can be signed using private keys from the wallet
// forkId is 0 for bitcoin, 0x40 for b-cash
// seed is the master private key (wallet seed) corresponding to the master public key given when the wallet was created
// returns true if all inputs were signed, or false if there was an error or not all inputs were able to be signed
int BRWalletSignTransaction(BRWallet *wallet, BRTransaction *tx, int forkId, const void *seed, size_t seedLen)
{
uint32_t j, internalIdx[tx->inCount], externalIdx[tx->inCount];
size_t i, internalCount = 0, externalCount = 0;
int r = 0;
assert(wallet != NULL);
assert(tx != NULL);
pthread_mutex_lock(&wallet->lock);
for (i = 0; tx && i < tx->inCount; i++) {
for (j = (uint32_t)array_count(wallet->internalChain); j > 0; j--) {
if (BRAddressEq(tx->inputs[i].address, &wallet->internalChain[j - 1])) internalIdx[internalCount++] = j - 1;
}
for (j = (uint32_t)array_count(wallet->externalChain); j > 0; j--) {
if (BRAddressEq(tx->inputs[i].address, &wallet->externalChain[j - 1])) externalIdx[externalCount++] = j - 1;
}
}
pthread_mutex_unlock(&wallet->lock);
BRKey keys[internalCount + externalCount];
if (seed) {
BRBIP32PrivKeyList(keys, internalCount, seed, seedLen, SEQUENCE_INTERNAL_CHAIN, internalIdx);
BRBIP32PrivKeyList(&keys[internalCount], externalCount, seed, seedLen, SEQUENCE_EXTERNAL_CHAIN, externalIdx);
// TODO: XXX wipe seed callback
seed = NULL;
if (tx) r = BRTransactionSign(tx, forkId, keys, internalCount + externalCount);
for (i = 0; i < internalCount + externalCount; i++) BRKeyClean(&keys[i]);
}
else r = -1; // user canceled authentication
return r;
}
// true if the given transaction is associated with the wallet (even if it hasn't been registered)
int BRWalletContainsTransaction(BRWallet *wallet, const BRTransaction *tx)
{
int r = 0;
assert(wallet != NULL);
assert(tx != NULL);
pthread_mutex_lock(&wallet->lock);
if (tx) r = _BRWalletContainsTx(wallet, tx);
pthread_mutex_unlock(&wallet->lock);
return r;
}
// adds a transaction to the wallet, or returns false if it isn't associated with the wallet
int BRWalletRegisterTransaction(BRWallet *wallet, BRTransaction *tx)
{
int wasAdded = 0, r = 1;
assert(wallet != NULL);
assert(tx != NULL && BRTransactionIsSigned(tx));
if (tx && BRTransactionIsSigned(tx)) {
pthread_mutex_lock(&wallet->lock);
if (! BRSetContains(wallet->allTx, tx)) {
if (_BRWalletContainsTx(wallet, tx)) {
// TODO: verify signatures when possible
// TODO: handle tx replacement with input sequence numbers
// (for now, replacements appear invalid until confirmation)
BRSetAdd(wallet->allTx, tx);
_BRWalletInsertTx(wallet, tx);
_BRWalletUpdateBalance(wallet);
wasAdded = 1;
}
else { // keep track of unconfirmed non-wallet tx for invalid tx checks and child-pays-for-parent fees
// BUG: limit total non-wallet unconfirmed tx to avoid memory exhaustion attack
if (tx->blockHeight == TX_UNCONFIRMED) BRSetAdd(wallet->allTx, tx);
r = 0;
// BUG: XXX memory leak if tx is not added to wallet->allTx, and we can't just free it
}
}
pthread_mutex_unlock(&wallet->lock);
}
else r = 0;
if (wasAdded) {
// when a wallet address is used in a transaction, generate a new address to replace it
BRWalletUnusedAddrs(wallet, NULL, SEQUENCE_GAP_LIMIT_EXTERNAL, 0);
BRWalletUnusedAddrs(wallet, NULL, SEQUENCE_GAP_LIMIT_INTERNAL, 1);
if (wallet->balanceChanged) wallet->balanceChanged(wallet->callbackInfo, wallet->balance);
if (wallet->txAdded) wallet->txAdded(wallet->callbackInfo, tx);
}
return r;
}
// removes a tx from the wallet and calls BRTransactionFree() on it, along with any tx that depend on its outputs
void BRWalletRemoveTransaction(BRWallet *wallet, UInt256 txHash)
{
BRTransaction *tx, *t;
UInt256 *hashes = NULL;
int notifyUser = 0, recommendRescan = 0;
assert(wallet != NULL);
assert(! UInt256IsZero(txHash));
pthread_mutex_lock(&wallet->lock);
tx = BRSetGet(wallet->allTx, &txHash);
if (tx) {
array_new(hashes, 0);
for (size_t i = array_count(wallet->transactions); i > 0; i--) { // find depedent transactions
t = wallet->transactions[i - 1];
if (t->blockHeight < tx->blockHeight) break;
if (BRTransactionEq(tx, t)) continue;
for (size_t j = 0; j < t->inCount; j++) {
if (! UInt256Eq(t->inputs[j].txHash, txHash)) continue;
array_add(hashes, t->txHash);
break;
}
}
if (array_count(hashes) > 0) {
pthread_mutex_unlock(&wallet->lock);
for (size_t i = array_count(hashes); i > 0; i--) {
BRWalletRemoveTransaction(wallet, hashes[i - 1]);
}
BRWalletRemoveTransaction(wallet, txHash);
}
else {
BRSetRemove(wallet->allTx, tx);
for (size_t i = array_count(wallet->transactions); i > 0; i--) {
if (! BRTransactionEq(wallet->transactions[i - 1], tx)) continue;
array_rm(wallet->transactions, i - 1);
break;
}
_BRWalletUpdateBalance(wallet);
pthread_mutex_unlock(&wallet->lock);
// if this is for a transaction we sent, and it wasn't already known to be invalid, notify user
if (BRWalletAmountSentByTx(wallet, tx) > 0 && BRWalletTransactionIsValid(wallet, tx)) {
recommendRescan = notifyUser = 1;
for (size_t i = 0; i < tx->inCount; i++) { // only recommend a rescan if all inputs are confirmed
t = BRWalletTransactionForHash(wallet, tx->inputs[i].txHash);
if (t && t->blockHeight != TX_UNCONFIRMED) continue;
recommendRescan = 0;
break;
}
}
if (wallet->balanceChanged) wallet->balanceChanged(wallet->callbackInfo, wallet->balance);
if (wallet->txDeleted) wallet->txDeleted(wallet->callbackInfo, txHash, notifyUser, recommendRescan);
BRTransactionFree(tx);
}
array_free(hashes);
}
else pthread_mutex_unlock(&wallet->lock);
}
// returns the transaction with the given hash if it's been registered in the wallet
BRTransaction *BRWalletTransactionForHash(BRWallet *wallet, UInt256 txHash)
{
BRTransaction *tx;
assert(wallet != NULL);
assert(! UInt256IsZero(txHash));
pthread_mutex_lock(&wallet->lock);
tx = BRSetGet(wallet->allTx, &txHash);
pthread_mutex_unlock(&wallet->lock);
return tx;
}
// true if no previous wallet transaction spends any of the given transaction's inputs, and no inputs are invalid
int BRWalletTransactionIsValid(BRWallet *wallet, const BRTransaction *tx)
{
BRTransaction *t;
int r = 1;
assert(wallet != NULL);
assert(tx != NULL && BRTransactionIsSigned(tx));
// TODO: XXX attempted double spends should cause conflicted tx to remain unverified until they're confirmed
// TODO: XXX conflicted tx with the same wallet outputs should be presented as the same tx to the user
if (tx && tx->blockHeight == TX_UNCONFIRMED) { // only unconfirmed transactions can be invalid
pthread_mutex_lock(&wallet->lock);
if (! BRSetContains(wallet->allTx, tx)) {
for (size_t i = 0; r && i < tx->inCount; i++) {
if (BRSetContains(wallet->spentOutputs, &tx->inputs[i])) r = 0;
}
}
else if (BRSetContains(wallet->invalidTx, tx)) r = 0;
pthread_mutex_unlock(&wallet->lock);
for (size_t i = 0; r && i < tx->inCount; i++) {
t = BRWalletTransactionForHash(wallet, tx->inputs[i].txHash);
if (t && ! BRWalletTransactionIsValid(wallet, t)) r = 0;
}
}
return r;
}
// true if tx cannot be immediately spent (i.e. if it or an input tx can be replaced-by-fee)
int BRWalletTransactionIsPending(BRWallet *wallet, const BRTransaction *tx)
{
BRTransaction *t;
time_t now = time(NULL);
uint32_t blockHeight;
int r = 0;
assert(wallet != NULL);
assert(tx != NULL && BRTransactionIsSigned(tx));
pthread_mutex_lock(&wallet->lock);
blockHeight = wallet->blockHeight;
pthread_mutex_unlock(&wallet->lock);
if (tx && tx->blockHeight == TX_UNCONFIRMED) { // only unconfirmed transactions can be postdated
if (BRTransactionSize(tx) > TX_MAX_SIZE) r = 1; // check transaction size is under TX_MAX_SIZE
for (size_t i = 0; ! r && i < tx->inCount; i++) {
if (tx->inputs[i].sequence < UINT32_MAX - 1) r = 1; // check for replace-by-fee
if (tx->inputs[i].sequence < UINT32_MAX && tx->lockTime < TX_MAX_LOCK_HEIGHT &&
tx->lockTime > blockHeight + 1) r = 1; // future lockTime
if (tx->inputs[i].sequence < UINT32_MAX && tx->lockTime > now) r = 1; // future lockTime
}
for (size_t i = 0; ! r && i < tx->outCount; i++) { // check that no outputs are dust
if (tx->outputs[i].amount < TX_MIN_OUTPUT_AMOUNT) r = 1;
}
for (size_t i = 0; ! r && i < tx->inCount; i++) { // check if any inputs are known to be pending
t = BRWalletTransactionForHash(wallet, tx->inputs[i].txHash);
if (t && BRWalletTransactionIsPending(wallet, t)) r = 1;
}
}
return r;
}
// true if tx is considered 0-conf safe (valid and not pending, timestamp is greater than 0, and no unverified inputs)
int BRWalletTransactionIsVerified(BRWallet *wallet, const BRTransaction *tx)
{
BRTransaction *t;
int r = 1;
assert(wallet != NULL);
assert(tx != NULL && BRTransactionIsSigned(tx));
if (tx && tx->blockHeight == TX_UNCONFIRMED) { // only unconfirmed transactions can be unverified
if (tx->timestamp == 0 || ! BRWalletTransactionIsValid(wallet, tx) ||
BRWalletTransactionIsPending(wallet, tx)) r = 0;
for (size_t i = 0; r && i < tx->inCount; i++) { // check if any inputs are known to be unverified
t = BRWalletTransactionForHash(wallet, tx->inputs[i].txHash);
if (t && ! BRWalletTransactionIsVerified(wallet, t)) r = 0;
}
}
return r;
}
// set the block heights and timestamps for the given transactions
// use height TX_UNCONFIRMED and timestamp 0 to indicate a tx should remain marked as unverified (not 0-conf safe)
void BRWalletUpdateTransactions(BRWallet *wallet, const UInt256 txHashes[], size_t txCount, uint32_t blockHeight,
uint32_t timestamp)
{
BRTransaction *tx;
UInt256 hashes[txCount];
int needsUpdate = 0;
size_t i, j, k;
assert(wallet != NULL);
assert(txHashes != NULL || txCount == 0);
pthread_mutex_lock(&wallet->lock);
if (blockHeight > wallet->blockHeight) wallet->blockHeight = blockHeight;
for (i = 0, j = 0; txHashes && i < txCount; i++) {
tx = BRSetGet(wallet->allTx, &txHashes[i]);
if (! tx || (tx->blockHeight == blockHeight && tx->timestamp == timestamp)) continue;
tx->timestamp = timestamp;
tx->blockHeight = blockHeight;
if (_BRWalletContainsTx(wallet, tx)) {
for (k = array_count(wallet->transactions); k > 0; k--) { // remove and re-insert tx to keep wallet sorted
if (! BRTransactionEq(wallet->transactions[k - 1], tx)) continue;
array_rm(wallet->transactions, k - 1);
_BRWalletInsertTx(wallet, tx);
break;
}
hashes[j++] = txHashes[i];
if (BRSetContains(wallet->pendingTx, tx) || BRSetContains(wallet->invalidTx, tx)) needsUpdate = 1;
}
else if (blockHeight != TX_UNCONFIRMED) { // remove and free confirmed non-wallet tx
BRSetRemove(wallet->allTx, tx);
BRTransactionFree(tx);
}
}
if (needsUpdate) _BRWalletUpdateBalance(wallet);
pthread_mutex_unlock(&wallet->lock);
if (needsUpdate && wallet->balanceChanged) {
wallet->balanceChanged(wallet->callbackInfo, wallet->balance);
}
if (j > 0 && wallet->txUpdated) wallet->txUpdated(wallet->callbackInfo, hashes, j, blockHeight, timestamp);
}
// marks all transactions confirmed after blockHeight as unconfirmed (useful for chain re-orgs)
void BRWalletSetTxUnconfirmedAfter(BRWallet *wallet, uint32_t blockHeight)