Line data Source code
1 : // Copyright (c) 2009-2022 The Bitcoin Core developers
2 : // Distributed under the MIT software license, see the accompanying
3 : // file COPYING or http://www.opensource.org/licenses/mit-license.php.
4 :
5 : #include <core_io.h>
6 :
7 : #include <primitives/block.h>
8 : #include <primitives/transaction.h>
9 : #include <script/script.h>
10 : #include <script/sign.h>
11 : #include <serialize.h>
12 : #include <streams.h>
13 : #include <util/result.h>
14 : #include <util/strencodings.h>
15 : #include <version.h>
16 :
17 : #include <algorithm>
18 : #include <string>
19 :
20 : namespace {
21 : class OpCodeParser
22 : {
23 : private:
24 : std::map<std::string, opcodetype> mapOpNames;
25 :
26 : public:
27 0 : OpCodeParser()
28 : {
29 0 : for (unsigned int op = 0; op <= MAX_OPCODE; ++op) {
30 : // Allow OP_RESERVED to get into mapOpNames
31 0 : if (op < OP_NOP && op != OP_RESERVED) {
32 0 : continue;
33 : }
34 :
35 0 : std::string strName = GetOpName(static_cast<opcodetype>(op));
36 0 : if (strName == "OP_UNKNOWN") {
37 0 : continue;
38 : }
39 0 : mapOpNames[strName] = static_cast<opcodetype>(op);
40 : // Convenience: OP_ADD and just ADD are both recognized:
41 0 : if (strName.compare(0, 3, "OP_") == 0) { // strName starts with "OP_"
42 0 : mapOpNames[strName.substr(3)] = static_cast<opcodetype>(op);
43 0 : }
44 0 : }
45 0 : }
46 0 : opcodetype Parse(const std::string& s) const
47 : {
48 0 : auto it = mapOpNames.find(s);
49 0 : if (it == mapOpNames.end()) throw std::runtime_error("script parse error: unknown opcode");
50 0 : return it->second;
51 0 : }
52 : };
53 :
54 0 : opcodetype ParseOpCode(const std::string& s)
55 : {
56 0 : static const OpCodeParser ocp;
57 0 : return ocp.Parse(s);
58 0 : }
59 :
60 : } // namespace
61 :
62 0 : CScript ParseScript(const std::string& s)
63 : {
64 0 : CScript result;
65 :
66 0 : std::vector<std::string> words = SplitString(s, " \t\n");
67 :
68 0 : for (const std::string& w : words) {
69 0 : if (w.empty()) {
70 : // Empty string, ignore. (SplitString doesn't combine multiple separators)
71 0 : } else if (std::all_of(w.begin(), w.end(), ::IsDigit) ||
72 0 : (w.front() == '-' && w.size() > 1 && std::all_of(w.begin() + 1, w.end(), ::IsDigit)))
73 : {
74 2 : // Number
75 0 : const auto num{ToIntegral<int64_t>(w)};
76 :
77 : // limit the range of numbers ParseScript accepts in decimal
78 : // since numbers outside -0xFFFFFFFF...0xFFFFFFFF are illegal in scripts
79 0 : if (!num.has_value() || num > int64_t{0xffffffff} || num < -1 * int64_t{0xffffffff}) {
80 0 : throw std::runtime_error("script parse error: decimal numeric value only allowed in the "
81 : "range -0xFFFFFFFF...0xFFFFFFFF");
82 : }
83 :
84 0 : result << num.value();
85 0 : } else if (w.substr(0, 2) == "0x" && w.size() > 2 && IsHex(std::string(w.begin() + 2, w.end()))) {
86 : // Raw hex data, inserted NOT pushed onto stack:
87 0 : std::vector<unsigned char> raw = ParseHex(std::string(w.begin() + 2, w.end()));
88 0 : result.insert(result.end(), raw.begin(), raw.end());
89 0 : } else if (w.size() >= 2 && w.front() == '\'' && w.back() == '\'') {
90 : // Single-quoted string, pushed as data. NOTE: this is poor-man's
91 : // parsing, spaces/tabs/newlines in single-quoted strings won't work.
92 0 : std::vector<unsigned char> value(w.begin() + 1, w.end() - 1);
93 0 : result << value;
94 0 : } else {
95 : // opcode, e.g. OP_ADD or ADD:
96 0 : result << ParseOpCode(w);
97 : }
98 : }
99 :
100 0 : return result;
101 0 : }
102 :
103 : // Check that all of the input and output scripts of a transaction contains valid opcodes
104 0 : static bool CheckTxScriptsSanity(const CMutableTransaction& tx)
105 : {
106 : // Check input scripts for non-coinbase txs
107 0 : if (!CTransaction(tx).IsCoinBase()) {
108 0 : for (unsigned int i = 0; i < tx.vin.size(); i++) {
109 0 : if (!tx.vin[i].scriptSig.HasValidOps() || tx.vin[i].scriptSig.size() > MAX_SCRIPT_SIZE) {
110 0 : return false;
111 : }
112 0 : }
113 0 : }
114 : // Check output scripts
115 0 : for (unsigned int i = 0; i < tx.vout.size(); i++) {
116 0 : if (!tx.vout[i].scriptPubKey.HasValidOps() || tx.vout[i].scriptPubKey.size() > MAX_SCRIPT_SIZE) {
117 0 : return false;
118 : }
119 0 : }
120 :
121 0 : return true;
122 0 : }
123 :
124 0 : static bool DecodeTx(CMutableTransaction& tx, const std::vector<unsigned char>& tx_data, bool try_no_witness, bool try_witness)
125 : {
126 : // General strategy:
127 : // - Decode both with extended serialization (which interprets the 0x0001 tag as a marker for
128 : // the presence of witnesses) and with legacy serialization (which interprets the tag as a
129 : // 0-input 1-output incomplete transaction).
130 : // - Restricted by try_no_witness (which disables legacy if false) and try_witness (which
131 : // disables extended if false).
132 : // - Ignore serializations that do not fully consume the hex string.
133 : // - If neither succeeds, fail.
134 : // - If only one succeeds, return that one.
135 : // - If both decode attempts succeed:
136 : // - If only one passes the CheckTxScriptsSanity check, return that one.
137 : // - If neither or both pass CheckTxScriptsSanity, return the extended one.
138 :
139 0 : CMutableTransaction tx_extended, tx_legacy;
140 0 : bool ok_extended = false, ok_legacy = false;
141 :
142 : // Try decoding with extended serialization support, and remember if the result successfully
143 : // consumes the entire input.
144 0 : if (try_witness) {
145 0 : CDataStream ssData(tx_data, SER_NETWORK, PROTOCOL_VERSION);
146 : try {
147 0 : ssData >> tx_extended;
148 0 : if (ssData.empty()) ok_extended = true;
149 0 : } catch (const std::exception&) {
150 : // Fall through.
151 0 : }
152 0 : }
153 :
154 : // Optimization: if extended decoding succeeded and the result passes CheckTxScriptsSanity,
155 : // don't bother decoding the other way.
156 0 : if (ok_extended && CheckTxScriptsSanity(tx_extended)) {
157 0 : tx = std::move(tx_extended);
158 0 : return true;
159 : }
160 :
161 : // Try decoding with legacy serialization, and remember if the result successfully consumes the entire input.
162 0 : if (try_no_witness) {
163 0 : CDataStream ssData(tx_data, SER_NETWORK, PROTOCOL_VERSION | SERIALIZE_TRANSACTION_NO_WITNESS);
164 : try {
165 0 : ssData >> tx_legacy;
166 0 : if (ssData.empty()) ok_legacy = true;
167 0 : } catch (const std::exception&) {
168 : // Fall through.
169 0 : }
170 0 : }
171 :
172 : // If legacy decoding succeeded and passes CheckTxScriptsSanity, that's our answer, as we know
173 : // at this point that extended decoding either failed or doesn't pass the sanity check.
174 0 : if (ok_legacy && CheckTxScriptsSanity(tx_legacy)) {
175 0 : tx = std::move(tx_legacy);
176 0 : return true;
177 : }
178 :
179 : // If extended decoding succeeded, and neither decoding passes sanity, return the extended one.
180 0 : if (ok_extended) {
181 0 : tx = std::move(tx_extended);
182 0 : return true;
183 : }
184 :
185 : // If legacy decoding succeeded and extended didn't, return the legacy one.
186 0 : if (ok_legacy) {
187 0 : tx = std::move(tx_legacy);
188 0 : return true;
189 : }
190 :
191 : // If none succeeded, we failed.
192 0 : return false;
193 0 : }
194 :
195 0 : bool DecodeHexTx(CMutableTransaction& tx, const std::string& hex_tx, bool try_no_witness, bool try_witness)
196 : {
197 0 : if (!IsHex(hex_tx)) {
198 0 : return false;
199 : }
200 :
201 0 : std::vector<unsigned char> txData(ParseHex(hex_tx));
202 0 : return DecodeTx(tx, txData, try_no_witness, try_witness);
203 0 : }
204 :
205 0 : bool DecodeHexBlockHeader(CBlockHeader& header, const std::string& hex_header)
206 : {
207 0 : if (!IsHex(hex_header)) return false;
208 :
209 0 : const std::vector<unsigned char> header_data{ParseHex(hex_header)};
210 0 : DataStream ser_header{header_data};
211 : try {
212 0 : ser_header >> header;
213 0 : } catch (const std::exception&) {
214 0 : return false;
215 0 : }
216 0 : return true;
217 0 : }
218 :
219 0 : bool DecodeHexBlk(CBlock& block, const std::string& strHexBlk)
220 : {
221 0 : if (!IsHex(strHexBlk))
222 0 : return false;
223 :
224 0 : std::vector<unsigned char> blockData(ParseHex(strHexBlk));
225 0 : CDataStream ssBlock(blockData, SER_NETWORK, PROTOCOL_VERSION);
226 : try {
227 0 : ssBlock >> block;
228 0 : }
229 : catch (const std::exception&) {
230 0 : return false;
231 0 : }
232 :
233 0 : return true;
234 0 : }
235 :
236 0 : bool ParseHashStr(const std::string& strHex, uint256& result)
237 : {
238 0 : if ((strHex.size() != 64) || !IsHex(strHex))
239 0 : return false;
240 :
241 0 : result.SetHex(strHex);
242 0 : return true;
243 0 : }
244 :
245 0 : util::Result<int> SighashFromStr(const std::string& sighash)
246 : {
247 0 : static std::map<std::string, int> map_sighash_values = {
248 0 : {std::string("DEFAULT"), int(SIGHASH_DEFAULT)},
249 0 : {std::string("ALL"), int(SIGHASH_ALL)},
250 0 : {std::string("ALL|ANYONECANPAY"), int(SIGHASH_ALL|SIGHASH_ANYONECANPAY)},
251 0 : {std::string("NONE"), int(SIGHASH_NONE)},
252 0 : {std::string("NONE|ANYONECANPAY"), int(SIGHASH_NONE|SIGHASH_ANYONECANPAY)},
253 0 : {std::string("SINGLE"), int(SIGHASH_SINGLE)},
254 0 : {std::string("SINGLE|ANYONECANPAY"), int(SIGHASH_SINGLE|SIGHASH_ANYONECANPAY)},
255 : };
256 0 : const auto& it = map_sighash_values.find(sighash);
257 0 : if (it != map_sighash_values.end()) {
258 0 : return it->second;
259 : } else {
260 0 : return util::Error{Untranslated(sighash + " is not a valid sighash parameter.")};
261 : }
262 0 : }
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