static void script_tx_sighash(struct wallet *wallet, uint256 *hash,
const struct buff *scriptPubKey,
const struct btc_msg_tx *tx, uint32 idx,
enum script_hash_type hashType) {
struct btc_msg_tx *tx2;
struct buff *buf;
int i;
ASSERT(idx < tx->in_count);
memset(hash, 0, sizeof *hash);
tx2 = btc_msg_tx_dup(tx);
Log(LGPFX " Computing sighash for txi-%u/%llu\n", idx, tx2->in_count);
/*
* Zero-out all the inputs' signatures.
*/
for (i = 0; i < tx2->in_count; i++) {
tx2->tx_in[i].scriptLength = 0;
}
size_t len = buff_maxlen(scriptPubKey);
ASSERT(len > 0);
ASSERT(tx2->tx_in[idx].scriptSig == NULL);
ASSERT(tx2->tx_in[idx].scriptLength == 0);
tx2->tx_in[idx].scriptLength = len;
tx2->tx_in[idx].scriptSig = safe_malloc(len);
memcpy(tx2->tx_in[idx].scriptSig, buff_base(scriptPubKey), len);
ASSERT((hashType & 0x1f) == SIGHASH_ALL);
/*
* Final step:
*
* Serialize tx + hashType (as a uint32) and compute hash.
*/
buf = buff_alloc();
serialize_tx(buf, tx2);
serialize_uint32(buf, hashType);
hash256_calc(buff_base(buf), buff_curlen(buf), hash);
buff_free(buf);
btc_msg_tx_free(tx2);
free(tx2);
}
int
txdb_craft_tx(struct txdb *txdb,
const struct btc_tx_desc *tx_desc,
btc_msg_tx *tx)
{
struct buff *buf;
char hashStr[80];
uint256 txHash;
uint64 change;
uint32 numCoins;
bool relevant;
mtime_t ts;
int res;
res = 0;
relevant = 0;
tx->version = 1;
txdb_prepare_txout(tx_desc, tx);
/*
* In order to properly size 'tx->txIn', we need to determine how many coins
* we're going to use. Right now, let's just vastly overestimate.
*/
numCoins = hashtable_getnumentries(txdb->hash_txo);
tx->tx_in = safe_calloc(numCoins, sizeof *tx->tx_in);
txdb_print_coins(txdb, 1);
txdb_select_coins(txdb, tx_desc, tx, &change);
/*
* Change! XXX: fix me.
*/
if (change > 0) {
const char *btc_change;
btc_change = wallet_get_change_addr(btc->wallet);
tx->out_count++;
txdb_set_txo(tx, tx->out_count - 1, btc_change, change);
Warning(LGPFX" change: %llu -- %.8f BTC\n", change, change / ONE_BTC);
}
txdb_sign_tx_inputs(txdb, tx);
/*
* Now that the tx is ready, serialize it and check that it's not too big.
*/
btcmsg_print_tx(tx);
buf = buff_alloc();
serialize_tx(buf, tx);
if (buff_curlen(buf) > BTC_TX_MAX_SIZE) {
Warning(LGPFX" tx too large: %zu\n", buff_curlen(buf));
res = 1;
goto exit;
}
hash256_calc(buff_base(buf), buff_curlen(buf), &txHash);
uint256_snprintf_reverse(hashStr, sizeof hashStr, &txHash);
Warning(LGPFX" %s (%zu bytes)\n", hashStr, buff_curlen(buf));
Log_Bytes(LGPFX" TX: ", buff_base(buf), buff_curlen(buf));
if (bitc_testing) {
Warning("TESTING! Not saving/relaying tx.\n");
goto exit;
}
ts = time(NULL);
res = txdb_remember_tx(txdb, 0 /* save to disk */, ts,
buff_base(buf), buff_curlen(buf),
&txHash, NULL, &relevant);
txdb_save_tx_label(tx_desc, hashStr);
txdb_export_tx_info(txdb);
res = peergroup_new_tx_broadcast(btc->peerGroup, buf,
ts + 2 * 60 * 60, &txHash);
if (res) {
Warning(LGPFX" failed to transmit tx: %d\n", res);
bitcui_set_status("got errors while broadcasting tx");
}
exit:
buff_free(buf);
/*
* XXX: We should mark the coins used by this tx as "reserved", so that we
* do not attempt to use conflicting coins in subsequent TXs.
*/
return res;
}