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// Copyright (c) 2009-2020 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 <core_io.h>
#include <primitives/block.h>
#include <primitives/transaction.h>
#include <script/script.h>
#include <script/sign.h>
#include <serialize.h>
#include <streams.h>
#include <univalue.h>
#include <util/strencodings.h>
#include <version.h>
#include <boost/algorithm/string/classification.hpp>
#include <boost/algorithm/string/replace.hpp>
#include <boost/algorithm/string/split.hpp>
#include <algorithm>
#include <string>
CScript ParseScript(const std::string& s)
{
CScript result;
static std::map<std::string, opcodetype> mapOpNames;
if (mapOpNames.empty())
{
for (unsigned int op = 0; op <= MAX_OPCODE; op++)
{
// Allow OP_RESERVED to get into mapOpNames
if (op < OP_NOP && op != OP_RESERVED)
continue;
std::string strName = GetOpName(static_cast<opcodetype>(op));
if (strName == "OP_UNKNOWN")
continue;
mapOpNames[strName] = static_cast<opcodetype>(op);
// Convenience: OP_ADD and just ADD are both recognized:
boost::algorithm::replace_first(strName, "OP_", "");
mapOpNames[strName] = static_cast<opcodetype>(op);
}
}
std::vector<std::string> words;
boost::algorithm::split(words, s, boost::algorithm::is_any_of(" \t\n"), boost::algorithm::token_compress_on);
for (std::vector<std::string>::const_iterator w = words.begin(); w != words.end(); ++w)
{
if (w->empty())
{
// Empty string, ignore. (boost::split given '' will return one word)
}
else if (std::all_of(w->begin(), w->end(), ::IsDigit) ||
(w->front() == '-' && w->size() > 1 && std::all_of(w->begin()+1, w->end(), ::IsDigit)))
{
// Number
int64_t n = atoi64(*w);
//limit the range of numbers ParseScript accepts in decimal
//since numbers outside -0xFFFFFFFF...0xFFFFFFFF are illegal in scripts
if (n > int64_t{0xffffffff} || n < -1 * int64_t{0xffffffff}) {
throw std::runtime_error("script parse error: decimal numeric value only allowed in the "
"range -0xFFFFFFFF...0xFFFFFFFF");
}
result << n;
}
else if (w->substr(0,2) == "0x" && w->size() > 2 && IsHex(std::string(w->begin()+2, w->end())))
{
// Raw hex data, inserted NOT pushed onto stack:
std::vector<unsigned char> raw = ParseHex(std::string(w->begin()+2, w->end()));
result.insert(result.end(), raw.begin(), raw.end());
}
else if (w->size() >= 2 && w->front() == '\'' && w->back() == '\'')
{
// Single-quoted string, pushed as data. NOTE: this is poor-man's
// parsing, spaces/tabs/newlines in single-quoted strings won't work.
std::vector<unsigned char> value(w->begin()+1, w->end()-1);
result << value;
}
else if (mapOpNames.count(*w))
{
// opcode, e.g. OP_ADD or ADD:
result << mapOpNames[*w];
}
else
{
throw std::runtime_error("script parse error");
}
}
return result;
}
// Check that all of the input and output scripts of a transaction contains valid opcodes
static bool CheckTxScriptsSanity(const CMutableTransaction& tx)
{
// Check input scripts for non-coinbase txs
if (!CTransaction(tx).IsCoinBase()) {
for (unsigned int i = 0; i < tx.vin.size(); i++) {
if (!tx.vin[i].scriptSig.HasValidOps() || tx.vin[i].scriptSig.size() > MAX_SCRIPT_SIZE) {
return false;
}
}
}
// Check output scripts
for (unsigned int i = 0; i < tx.vout.size(); i++) {
if (!tx.vout[i].scriptPubKey.HasValidOps() || tx.vout[i].scriptPubKey.size() > MAX_SCRIPT_SIZE) {
return false;
}
}
return true;
}
static bool DecodeTx(CMutableTransaction& tx, const std::vector<unsigned char>& tx_data, bool try_no_witness, bool try_witness)
{
if (try_witness) {
CDataStream ssData(tx_data, SER_NETWORK, PROTOCOL_VERSION);
try {
ssData >> tx;
// If transaction looks sane, we don't try other mode even if requested
if (ssData.empty() && (!try_no_witness || CheckTxScriptsSanity(tx))) {
return true;
}
} catch (const std::exception&) {
// Fall through.
}
}
if (try_no_witness) {
CDataStream ssData(tx_data, SER_NETWORK, PROTOCOL_VERSION | SERIALIZE_TRANSACTION_NO_WITNESS);
try {
ssData >> tx;
if (ssData.empty()) {
return true;
}
} catch (const std::exception&) {
// Fall through.
}
}
return false;
}
bool DecodeHexTx(CMutableTransaction& tx, const std::string& hex_tx, bool try_no_witness, bool try_witness)
{
if (!IsHex(hex_tx)) {
return false;
}
std::vector<unsigned char> txData(ParseHex(hex_tx));
return DecodeTx(tx, txData, try_no_witness, try_witness);
}
bool DecodeHexBlockHeader(CBlockHeader& header, const std::string& hex_header)
{
if (!IsHex(hex_header)) return false;
const std::vector<unsigned char> header_data{ParseHex(hex_header)};
CDataStream ser_header(header_data, SER_NETWORK, PROTOCOL_VERSION);
try {
ser_header >> header;
} catch (const std::exception&) {
return false;
}
return true;
}
bool DecodeHexBlk(CBlock& block, const std::string& strHexBlk)
{
if (!IsHex(strHexBlk))
return false;
std::vector<unsigned char> blockData(ParseHex(strHexBlk));
CDataStream ssBlock(blockData, SER_NETWORK, PROTOCOL_VERSION);
try {
ssBlock >> block;
}
catch (const std::exception&) {
return false;
}
return true;
}
bool ParseHashStr(const std::string& strHex, uint256& result)
{
if ((strHex.size() != 64) || !IsHex(strHex))
return false;
result.SetHex(strHex);
return true;
}
std::vector<unsigned char> ParseHexUV(const UniValue& v, const std::string& strName)
{
std::string strHex;
if (v.isStr())
strHex = v.getValStr();
if (!IsHex(strHex))
throw std::runtime_error(strName + " must be hexadecimal string (not '" + strHex + "')");
return ParseHex(strHex);
}
int ParseSighashString(const UniValue& sighash)
{
int hash_type = SIGHASH_ALL;
if (!sighash.isNull()) {
static std::map<std::string, int> map_sighash_values = {
{std::string("ALL"), int(SIGHASH_ALL)},
{std::string("ALL|ANYONECANPAY"), int(SIGHASH_ALL|SIGHASH_ANYONECANPAY)},
{std::string("NONE"), int(SIGHASH_NONE)},
{std::string("NONE|ANYONECANPAY"), int(SIGHASH_NONE|SIGHASH_ANYONECANPAY)},
{std::string("SINGLE"), int(SIGHASH_SINGLE)},
{std::string("SINGLE|ANYONECANPAY"), int(SIGHASH_SINGLE|SIGHASH_ANYONECANPAY)},
};
std::string strHashType = sighash.get_str();
const auto& it = map_sighash_values.find(strHashType);
if (it != map_sighash_values.end()) {
hash_type = it->second;
} else {
throw std::runtime_error(strHashType + " is not a valid sighash parameter.");
}
}
return hash_type;
}
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