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273 lines
9.3 KiB
273 lines
9.3 KiB
// Copyright (c) 2009-2020 The Bitcoin Core developers
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// Distributed under the MIT software license, see the accompanying
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// file COPYING or http://www.opensource.org/licenses/mit-license.php.
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#include <core_io.h>
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#include <primitives/block.h>
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#include <primitives/transaction.h>
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#include <script/script.h>
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#include <script/sign.h>
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#include <serialize.h>
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#include <streams.h>
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#include <univalue.h>
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#include <util/strencodings.h>
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#include <version.h>
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#include <boost/algorithm/string/classification.hpp>
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#include <boost/algorithm/string/replace.hpp>
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#include <boost/algorithm/string/split.hpp>
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#include <algorithm>
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#include <string>
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CScript ParseScript(const std::string& s)
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{
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CScript result;
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static std::map<std::string, opcodetype> mapOpNames;
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if (mapOpNames.empty())
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{
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for (unsigned int op = 0; op <= MAX_OPCODE; op++)
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{
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// Allow OP_RESERVED to get into mapOpNames
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if (op < OP_NOP && op != OP_RESERVED)
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continue;
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std::string strName = GetOpName(static_cast<opcodetype>(op));
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if (strName == "OP_UNKNOWN")
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continue;
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mapOpNames[strName] = static_cast<opcodetype>(op);
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// Convenience: OP_ADD and just ADD are both recognized:
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boost::algorithm::replace_first(strName, "OP_", "");
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mapOpNames[strName] = static_cast<opcodetype>(op);
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}
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}
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std::vector<std::string> words;
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boost::algorithm::split(words, s, boost::algorithm::is_any_of(" \t\n"), boost::algorithm::token_compress_on);
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for (std::vector<std::string>::const_iterator w = words.begin(); w != words.end(); ++w)
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{
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if (w->empty())
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{
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// Empty string, ignore. (boost::split given '' will return one word)
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}
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else if (std::all_of(w->begin(), w->end(), ::IsDigit) ||
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(w->front() == '-' && w->size() > 1 && std::all_of(w->begin()+1, w->end(), ::IsDigit)))
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{
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// Number
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int64_t n = atoi64(*w);
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//limit the range of numbers ParseScript accepts in decimal
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//since numbers outside -0xFFFFFFFF...0xFFFFFFFF are illegal in scripts
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if (n > int64_t{0xffffffff} || n < -1 * int64_t{0xffffffff}) {
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throw std::runtime_error("script parse error: decimal numeric value only allowed in the "
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"range -0xFFFFFFFF...0xFFFFFFFF");
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}
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result << n;
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}
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else if (w->substr(0,2) == "0x" && w->size() > 2 && IsHex(std::string(w->begin()+2, w->end())))
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{
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// Raw hex data, inserted NOT pushed onto stack:
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std::vector<unsigned char> raw = ParseHex(std::string(w->begin()+2, w->end()));
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result.insert(result.end(), raw.begin(), raw.end());
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}
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else if (w->size() >= 2 && w->front() == '\'' && w->back() == '\'')
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{
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// Single-quoted string, pushed as data. NOTE: this is poor-man's
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// parsing, spaces/tabs/newlines in single-quoted strings won't work.
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std::vector<unsigned char> value(w->begin()+1, w->end()-1);
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result << value;
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}
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else if (mapOpNames.count(*w))
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{
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// opcode, e.g. OP_ADD or ADD:
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result << mapOpNames[*w];
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}
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else
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{
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throw std::runtime_error("script parse error");
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}
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}
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return result;
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}
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// Check that all of the input and output scripts of a transaction contains valid opcodes
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static bool CheckTxScriptsSanity(const CMutableTransaction& tx)
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{
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// Check input scripts for non-coinbase txs
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if (!CTransaction(tx).IsCoinBase()) {
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for (unsigned int i = 0; i < tx.vin.size(); i++) {
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if (!tx.vin[i].scriptSig.HasValidOps() || tx.vin[i].scriptSig.size() > MAX_SCRIPT_SIZE) {
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return false;
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}
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}
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}
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// Check output scripts
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for (unsigned int i = 0; i < tx.vout.size(); i++) {
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if (!tx.vout[i].scriptPubKey.HasValidOps() || tx.vout[i].scriptPubKey.size() > MAX_SCRIPT_SIZE) {
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return false;
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}
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}
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return true;
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}
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static bool DecodeTx(CMutableTransaction& tx, const std::vector<unsigned char>& tx_data, bool try_no_witness, bool try_witness)
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{
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// General strategy:
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// - Decode both with extended serialization (which interprets the 0x0001 tag as a marker for
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// the presense of witnesses) and with legacy serialization (which interprets the tag as a
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// 0-input 1-output incomplete transaction).
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// - Restricted by try_no_witness (which disables legacy if false) and try_witness (which
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// disables extended if false).
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// - Ignore serializations that do not fully consume the hex string.
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// - If neither succeeds, fail.
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// - If only one succeeds, return that one.
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// - If both decode attempts succeed:
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// - If only one passes the CheckTxScriptsSanity check, return that one.
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// - If neither or both pass CheckTxScriptsSanity, return the extended one.
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CMutableTransaction tx_extended, tx_legacy;
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bool ok_extended = false, ok_legacy = false;
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// Try decoding with extended serialization support, and remember if the result successfully
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// consumes the entire input.
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if (try_witness) {
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CDataStream ssData(tx_data, SER_NETWORK, PROTOCOL_VERSION);
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try {
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ssData >> tx_extended;
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if (ssData.empty()) ok_extended = true;
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} catch (const std::exception&) {
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// Fall through.
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}
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}
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// Optimization: if extended decoding succeeded and the result passes CheckTxScriptsSanity,
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// don't bother decoding the other way.
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if (ok_extended && CheckTxScriptsSanity(tx_extended)) {
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tx = std::move(tx_extended);
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return true;
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}
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// Try decoding with legacy serialization, and remember if the result successfully consumes the entire input.
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if (try_no_witness) {
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CDataStream ssData(tx_data, SER_NETWORK, PROTOCOL_VERSION | SERIALIZE_TRANSACTION_NO_WITNESS | SERIALIZE_NO_MWEB);
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try {
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ssData >> tx_legacy;
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if (ssData.empty()) ok_legacy = true;
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} catch (const std::exception&) {
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// Fall through.
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}
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}
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// If legacy decoding succeeded and passes CheckTxScriptsSanity, that's our answer, as we know
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// at this point that extended decoding either failed or doesn't pass the sanity check.
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if (ok_legacy && CheckTxScriptsSanity(tx_legacy)) {
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tx = std::move(tx_legacy);
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return true;
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}
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// If extended decoding succeeded, and neither decoding passes sanity, return the extended one.
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if (ok_extended) {
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tx = std::move(tx_extended);
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return true;
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}
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// If legacy decoding succeeded and extended didn't, return the legacy one.
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if (ok_legacy) {
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tx = std::move(tx_legacy);
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return true;
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}
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// If none succeeded, we failed.
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return false;
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}
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bool DecodeHexTx(CMutableTransaction& tx, const std::string& hex_tx, bool try_no_witness, bool try_witness)
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{
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if (!IsHex(hex_tx)) {
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return false;
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}
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std::vector<unsigned char> txData(ParseHex(hex_tx));
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return DecodeTx(tx, txData, try_no_witness, try_witness);
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}
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bool DecodeHexBlockHeader(CBlockHeader& header, const std::string& hex_header)
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{
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if (!IsHex(hex_header)) return false;
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const std::vector<unsigned char> header_data{ParseHex(hex_header)};
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CDataStream ser_header(header_data, SER_NETWORK, PROTOCOL_VERSION);
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try {
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ser_header >> header;
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} catch (const std::exception&) {
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return false;
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}
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return true;
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}
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bool DecodeHexBlk(CBlock& block, const std::string& strHexBlk)
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{
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if (!IsHex(strHexBlk))
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return false;
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std::vector<unsigned char> blockData(ParseHex(strHexBlk));
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CDataStream ssBlock(blockData, SER_NETWORK, PROTOCOL_VERSION);
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try {
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ssBlock >> block;
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}
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catch (const std::exception&) {
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return false;
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}
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return true;
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}
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bool ParseHashStr(const std::string& strHex, uint256& result)
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{
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if ((strHex.size() != 64) || !IsHex(strHex))
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return false;
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result.SetHex(strHex);
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return true;
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}
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std::vector<unsigned char> ParseHexUV(const UniValue& v, const std::string& strName)
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{
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std::string strHex;
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if (v.isStr())
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strHex = v.getValStr();
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if (!IsHex(strHex))
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throw std::runtime_error(strName + " must be hexadecimal string (not '" + strHex + "')");
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return ParseHex(strHex);
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}
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int ParseSighashString(const UniValue& sighash)
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{
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int hash_type = SIGHASH_ALL;
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if (!sighash.isNull()) {
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static std::map<std::string, int> map_sighash_values = {
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{std::string("ALL"), int(SIGHASH_ALL)},
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{std::string("ALL|ANYONECANPAY"), int(SIGHASH_ALL|SIGHASH_ANYONECANPAY)},
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{std::string("NONE"), int(SIGHASH_NONE)},
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{std::string("NONE|ANYONECANPAY"), int(SIGHASH_NONE|SIGHASH_ANYONECANPAY)},
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{std::string("SINGLE"), int(SIGHASH_SINGLE)},
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{std::string("SINGLE|ANYONECANPAY"), int(SIGHASH_SINGLE|SIGHASH_ANYONECANPAY)},
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};
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std::string strHashType = sighash.get_str();
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const auto& it = map_sighash_values.find(strHashType);
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if (it != map_sighash_values.end()) {
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hash_type = it->second;
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} else {
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throw std::runtime_error(strHashType + " is not a valid sighash parameter.");
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}
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}
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return hash_type;
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}
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