bitcoin-tx.cpp raw
1 // Copyright (c) 2009-present 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 <bitcoin-build-config.h> // IWYU pragma: keep
6
7 #include <chainparamsbase.h>
8 #include <clientversion.h>
9 #include <coins.h>
10 #include <common/args.h>
11 #include <common/license_info.h>
12 #include <common/system.h>
13 #include <compat/compat.h>
14 #include <consensus/amount.h>
15 #include <consensus/consensus.h>
16 #include <core_io.h>
17 #include <key_io.h>
18 #include <policy/policy.h>
19 #include <primitives/transaction.h>
20 #include <script/script.h>
21 #include <script/sign.h>
22 #include <script/signingprovider.h>
23 #include <univalue.h>
24 #include <util/exception.h>
25 #include <util/fs.h>
26 #include <util/moneystr.h>
27 #include <util/rbf.h>
28 #include <util/strencodings.h>
29 #include <util/string.h>
30 #include <util/translation.h>
31
32 #include <cstdio>
33 #include <functional>
34 #include <memory>
35
36 using util::SplitString;
37 using util::ToString;
38 using util::TrimString;
39 using util::TrimStringView;
40
41 static bool fCreateBlank;
42 static std::map<std::string,UniValue> registers;
43 static const int CONTINUE_EXECUTION=-1;
44
45 const TranslateFn G_TRANSLATION_FUN{nullptr};
46
47 static void SetupBitcoinTxArgs(ArgsManager &argsman)
48 {
49 SetupHelpOptions(argsman);
50
51 argsman.AddArg("-version", "Print version and exit", ArgsManager::ALLOW_ANY, OptionsCategory::OPTIONS);
52 argsman.AddArg("-create", "Create new, empty TX.", ArgsManager::ALLOW_ANY, OptionsCategory::OPTIONS);
53 argsman.AddArg("-json", "Select JSON output", ArgsManager::ALLOW_ANY, OptionsCategory::OPTIONS);
54 argsman.AddArg("-txid", "Output only the hex-encoded transaction id of the resultant transaction.", ArgsManager::ALLOW_ANY, OptionsCategory::OPTIONS);
55 SetupChainParamsBaseOptions(argsman);
56
57 argsman.AddArg("delin=N", "Delete input N from TX", ArgsManager::ALLOW_ANY, OptionsCategory::COMMANDS);
58 argsman.AddArg("delout=N", "Delete output N from TX", ArgsManager::ALLOW_ANY, OptionsCategory::COMMANDS);
59 argsman.AddArg("in=TXID:VOUT(:SEQUENCE_NUMBER)", "Add input to TX", ArgsManager::ALLOW_ANY, OptionsCategory::COMMANDS);
60 argsman.AddArg("locktime=N", "Set TX lock time to N", ArgsManager::ALLOW_ANY, OptionsCategory::COMMANDS);
61 argsman.AddArg("nversion=N", "Set TX version to N", ArgsManager::ALLOW_ANY, OptionsCategory::COMMANDS);
62 argsman.AddArg("outaddr=VALUE:ADDRESS", "Add address-based output to TX", ArgsManager::ALLOW_ANY, OptionsCategory::COMMANDS);
63 argsman.AddArg("outdata=[VALUE:]DATA", "Add data-based output to TX", ArgsManager::ALLOW_ANY, OptionsCategory::COMMANDS);
64 argsman.AddArg("outmultisig=VALUE:REQUIRED:PUBKEYS:PUBKEY1:PUBKEY2:....[:FLAGS]", "Add Pay To n-of-m Multi-sig output to TX. n = REQUIRED, m = PUBKEYS. "
65 "Optionally add the \"W\" flag to produce a pay-to-witness-script-hash output. "
66 "Optionally add the \"S\" flag to wrap the output in a pay-to-script-hash.", ArgsManager::ALLOW_ANY, OptionsCategory::COMMANDS);
67 argsman.AddArg("outpubkey=VALUE:PUBKEY[:FLAGS]", "Add pay-to-pubkey output to TX. "
68 "Optionally add the \"W\" flag to produce a pay-to-witness-pubkey-hash output. "
69 "Optionally add the \"S\" flag to wrap the output in a pay-to-script-hash.", ArgsManager::ALLOW_ANY, OptionsCategory::COMMANDS);
70 argsman.AddArg("outscript=VALUE:SCRIPT[:FLAGS]", "Add raw script output to TX. "
71 "Optionally add the \"W\" flag to produce a pay-to-witness-script-hash output. "
72 "Optionally add the \"S\" flag to wrap the output in a pay-to-script-hash.", ArgsManager::ALLOW_ANY, OptionsCategory::COMMANDS);
73 argsman.AddArg("replaceable(=N)", "Sets Replace-By-Fee (RBF) opt-in sequence number for input N. "
74 "If N is not provided, the command attempts to opt-in all available inputs for RBF. "
75 "If the transaction has no inputs, this option is ignored.", ArgsManager::ALLOW_ANY, OptionsCategory::COMMANDS);
76 argsman.AddArg("sign=SIGHASH-FLAGS", "Add zero or more signatures to transaction. "
77 "This command requires JSON registers:"
78 "prevtxs=JSON object, "
79 "privatekeys=JSON object. "
80 "See signrawtransactionwithkey docs for format of sighash flags, JSON objects.", ArgsManager::ALLOW_ANY, OptionsCategory::COMMANDS);
81
82 argsman.AddArg("load=NAME:FILENAME", "Load JSON file FILENAME into register NAME", ArgsManager::ALLOW_ANY, OptionsCategory::REGISTER_COMMANDS);
83 argsman.AddArg("set=NAME:JSON-STRING", "Set register NAME to given JSON-STRING", ArgsManager::ALLOW_ANY, OptionsCategory::REGISTER_COMMANDS);
84 }
85
86 //
87 // This function returns either one of EXIT_ codes when it's expected to stop the process or
88 // CONTINUE_EXECUTION when it's expected to continue further.
89 //
90 static int AppInitRawTx(int argc, char* argv[])
91 {
92 SetupBitcoinTxArgs(gArgs);
93 std::string error;
94 if (!gArgs.ParseParameters(argc, argv, error)) {
95 tfm::format(std::cerr, "Error parsing command line arguments: %s\n", error);
96 return EXIT_FAILURE;
97 }
98
99 // Check for chain settings (Params() calls are only valid after this clause)
100 try {
101 SelectParams(gArgs.GetChainType());
102 } catch (const std::exception& e) {
103 tfm::format(std::cerr, "Error: %s\n", e.what());
104 return EXIT_FAILURE;
105 }
106
107 fCreateBlank = gArgs.GetBoolArg("-create", false);
108
109 if (argc < 2 || HelpRequested(gArgs) || gArgs.GetBoolArg("-version", false)) {
110 // First part of help message is specific to this utility
111 std::string strUsage = CLIENT_NAME " bitcoin-tx utility version " + FormatFullVersion() + "\n";
112
113 if (gArgs.GetBoolArg("-version", false)) {
114 strUsage += FormatParagraph(LicenseInfo());
115 } else {
116 strUsage += "\n"
117 "The bitcoin-tx tool is used for creating and modifying bitcoin transactions.\n\n"
118 "bitcoin-tx can be used with \"<hex-tx> [commands]\" to update a hex-encoded bitcoin transaction, or with \"-create [commands]\" to create a hex-encoded bitcoin transaction.\n"
119 "\n"
120 "Usage: bitcoin-tx [options] <hex-tx> [commands]\n"
121 "or: bitcoin-tx [options] -create [commands]\n"
122 "\n";
123 strUsage += gArgs.GetHelpMessage();
124 }
125
126 tfm::format(std::cout, "%s", strUsage);
127
128 if (argc < 2) {
129 tfm::format(std::cerr, "Error: too few parameters\n");
130 return EXIT_FAILURE;
131 }
132 return EXIT_SUCCESS;
133 }
134 return CONTINUE_EXECUTION;
135 }
136
137 static void RegisterSetJson(const std::string& key, const std::string& rawJson)
138 {
139 UniValue val;
140 if (!val.read(rawJson)) {
141 std::string strErr = "Cannot parse JSON for key " + key;
142 throw std::runtime_error(strErr);
143 }
144
145 registers[key] = val;
146 }
147
148 static void RegisterSet(const std::string& strInput)
149 {
150 // separate NAME:VALUE in string
151 size_t pos = strInput.find(':');
152 if ((pos == std::string::npos) ||
153 (pos == 0) ||
154 (pos == (strInput.size() - 1)))
155 throw std::runtime_error("Register input requires NAME:VALUE");
156
157 std::string key = strInput.substr(0, pos);
158 std::string valStr = strInput.substr(pos + 1, std::string::npos);
159
160 RegisterSetJson(key, valStr);
161 }
162
163 static void RegisterLoad(const std::string& strInput)
164 {
165 // separate NAME:FILENAME in string
166 size_t pos = strInput.find(':');
167 if ((pos == std::string::npos) ||
168 (pos == 0) ||
169 (pos == (strInput.size() - 1)))
170 throw std::runtime_error("Register load requires NAME:FILENAME");
171
172 std::string key = strInput.substr(0, pos);
173 std::string filename = strInput.substr(pos + 1, std::string::npos);
174
175 FILE *f = fsbridge::fopen(filename.c_str(), "r");
176 if (!f) {
177 std::string strErr = "Cannot open file " + filename;
178 throw std::runtime_error(strErr);
179 }
180
181 // load file chunks into one big buffer
182 std::string valStr;
183 while ((!feof(f)) && (!ferror(f))) {
184 char buf[4096];
185 int bread = fread(buf, 1, sizeof(buf), f);
186 if (bread <= 0)
187 break;
188
189 valStr.insert(valStr.size(), buf, bread);
190 }
191
192 int error = ferror(f);
193 fclose(f);
194
195 if (error) {
196 std::string strErr = "Error reading file " + filename;
197 throw std::runtime_error(strErr);
198 }
199
200 // evaluate as JSON buffer register
201 RegisterSetJson(key, valStr);
202 }
203
204 static CAmount ExtractAndValidateValue(const std::string& strValue)
205 {
206 if (std::optional<CAmount> parsed = ParseMoney(strValue)) {
207 return parsed.value();
208 } else {
209 throw std::runtime_error("invalid TX output value");
210 }
211 }
212
213 static void MutateTxVersion(CMutableTransaction& tx, const std::string& cmdVal)
214 {
215 const auto ver{ToIntegral<uint32_t>(cmdVal)};
216 if (!ver || *ver < 1 || *ver > TX_MAX_STANDARD_VERSION) {
217 throw std::runtime_error("Invalid TX version requested: '" + cmdVal + "'");
218 }
219 tx.version = *ver;
220 }
221
222 static void MutateTxLocktime(CMutableTransaction& tx, const std::string& cmdVal)
223 {
224 const auto locktime{ToIntegral<uint32_t>(cmdVal)};
225 if (!locktime) {
226 throw std::runtime_error("Invalid TX locktime requested: '" + cmdVal + "'");
227 }
228 tx.nLockTime = *locktime;
229 }
230
231 static void MutateTxRBFOptIn(CMutableTransaction& tx, const std::string& strInIdx)
232 {
233 const auto idx{ToIntegral<uint32_t>(strInIdx)};
234 if (strInIdx != "" && (!idx || *idx >= tx.vin.size())) {
235 throw std::runtime_error("Invalid TX input index '" + strInIdx + "'");
236 }
237
238 // set the nSequence to MAX_INT - 2 (= RBF opt in flag)
239 uint32_t cnt{0};
240 for (CTxIn& txin : tx.vin) {
241 if (strInIdx == "" || cnt == *idx) {
242 if (txin.nSequence > MAX_BIP125_RBF_SEQUENCE) {
243 txin.nSequence = MAX_BIP125_RBF_SEQUENCE;
244 }
245 }
246 ++cnt;
247 }
248 }
249
250 template <typename T>
251 static T TrimAndParse(const std::string& int_str, const std::string& err)
252 {
253 const auto parsed{ToIntegral<T>(TrimStringView(int_str))};
254 if (!parsed.has_value()) {
255 throw std::runtime_error(err + " '" + int_str + "'");
256 }
257 return parsed.value();
258 }
259
260 static void MutateTxAddInput(CMutableTransaction& tx, const std::string& strInput)
261 {
262 std::vector<std::string> vStrInputParts = SplitString(strInput, ':');
263
264 // separate TXID:VOUT in string
265 if (vStrInputParts.size()<2)
266 throw std::runtime_error("TX input missing separator");
267
268 // extract and validate TXID
269 auto txid{Txid::FromHex(vStrInputParts[0])};
270 if (!txid) {
271 throw std::runtime_error("invalid TX input txid");
272 }
273
274 static const unsigned int minTxOutSz = 9;
275 static const unsigned int maxVout = MAX_BLOCK_WEIGHT / (WITNESS_SCALE_FACTOR * minTxOutSz);
276
277 // extract and validate vout
278 const std::string& strVout = vStrInputParts[1];
279 const auto vout{ToIntegral<uint32_t>(strVout)};
280 if (!vout || *vout > maxVout) {
281 throw std::runtime_error("invalid TX input vout '" + strVout + "'");
282 }
283
284 // extract the optional sequence number
285 uint32_t nSequenceIn = CTxIn::SEQUENCE_FINAL;
286 if (vStrInputParts.size() > 2) {
287 nSequenceIn = TrimAndParse<uint32_t>(vStrInputParts.at(2), "invalid TX sequence id");
288 }
289
290 // append to transaction input list
291 CTxIn txin{*txid, *vout, CScript{}, nSequenceIn};
292 tx.vin.push_back(txin);
293 }
294
295 static void MutateTxAddOutAddr(CMutableTransaction& tx, const std::string& strInput)
296 {
297 // Separate into VALUE:ADDRESS
298 std::vector<std::string> vStrInputParts = SplitString(strInput, ':');
299
300 if (vStrInputParts.size() != 2)
301 throw std::runtime_error("TX output missing or too many separators");
302
303 // Extract and validate VALUE
304 CAmount value = ExtractAndValidateValue(vStrInputParts[0]);
305
306 // extract and validate ADDRESS
307 const std::string& strAddr = vStrInputParts[1];
308 CTxDestination destination = DecodeDestination(strAddr);
309 if (!IsValidDestination(destination)) {
310 throw std::runtime_error("invalid TX output address");
311 }
312 CScript scriptPubKey = GetScriptForDestination(destination);
313
314 // construct TxOut, append to transaction output list
315 CTxOut txout(value, scriptPubKey);
316 tx.vout.push_back(txout);
317 }
318
319 static void MutateTxAddOutPubKey(CMutableTransaction& tx, const std::string& strInput)
320 {
321 // Separate into VALUE:PUBKEY[:FLAGS]
322 std::vector<std::string> vStrInputParts = SplitString(strInput, ':');
323
324 if (vStrInputParts.size() < 2 || vStrInputParts.size() > 3)
325 throw std::runtime_error("TX output missing or too many separators");
326
327 // Extract and validate VALUE
328 CAmount value = ExtractAndValidateValue(vStrInputParts[0]);
329
330 // Extract and validate PUBKEY
331 CPubKey pubkey(ParseHex(vStrInputParts[1]));
332 if (!pubkey.IsFullyValid())
333 throw std::runtime_error("invalid TX output pubkey");
334 CScript scriptPubKey = GetScriptForRawPubKey(pubkey);
335
336 // Extract and validate FLAGS
337 bool bSegWit = false;
338 bool bScriptHash = false;
339 if (vStrInputParts.size() == 3) {
340 const std::string& flags = vStrInputParts[2];
341 bSegWit = (flags.find('W') != std::string::npos);
342 bScriptHash = (flags.find('S') != std::string::npos);
343 }
344
345 if (bSegWit) {
346 if (!pubkey.IsCompressed()) {
347 throw std::runtime_error("Uncompressed pubkeys are not useable for SegWit outputs");
348 }
349 // Build a P2WPKH script
350 scriptPubKey = GetScriptForDestination(WitnessV0KeyHash(pubkey));
351 }
352 if (bScriptHash) {
353 // Get the ID for the script, and then construct a P2SH destination for it.
354 scriptPubKey = GetScriptForDestination(ScriptHash(scriptPubKey));
355 }
356
357 // construct TxOut, append to transaction output list
358 CTxOut txout(value, scriptPubKey);
359 tx.vout.push_back(txout);
360 }
361
362 static void MutateTxAddOutMultiSig(CMutableTransaction& tx, const std::string& strInput)
363 {
364 // Separate into VALUE:REQUIRED:NUMKEYS:PUBKEY1:PUBKEY2:....[:FLAGS]
365 std::vector<std::string> vStrInputParts = SplitString(strInput, ':');
366
367 // Check that there are enough parameters
368 if (vStrInputParts.size()<3)
369 throw std::runtime_error("Not enough multisig parameters");
370
371 // Extract and validate VALUE
372 CAmount value = ExtractAndValidateValue(vStrInputParts[0]);
373
374 // Extract REQUIRED
375 const uint32_t required{TrimAndParse<uint32_t>(vStrInputParts.at(1), "invalid multisig required number")};
376
377 // Extract NUMKEYS
378 const uint32_t numkeys{TrimAndParse<uint32_t>(vStrInputParts.at(2), "invalid multisig total number")};
379
380 // Validate there are the correct number of pubkeys
381 if (vStrInputParts.size() < numkeys + 3)
382 throw std::runtime_error("incorrect number of multisig pubkeys");
383
384 if (required < 1 || required > MAX_PUBKEYS_PER_MULTISIG || numkeys < 1 || numkeys > MAX_PUBKEYS_PER_MULTISIG || numkeys < required)
385 throw std::runtime_error("multisig parameter mismatch. Required " \
386 + ToString(required) + " of " + ToString(numkeys) + "signatures.");
387
388 // extract and validate PUBKEYs
389 std::vector<CPubKey> pubkeys;
390 for(int pos = 1; pos <= int(numkeys); pos++) {
391 CPubKey pubkey(ParseHex(vStrInputParts[pos + 2]));
392 if (!pubkey.IsFullyValid())
393 throw std::runtime_error("invalid TX output pubkey");
394 pubkeys.push_back(pubkey);
395 }
396
397 // Extract FLAGS
398 bool bSegWit = false;
399 bool bScriptHash = false;
400 if (vStrInputParts.size() == numkeys + 4) {
401 const std::string& flags = vStrInputParts.back();
402 bSegWit = (flags.find('W') != std::string::npos);
403 bScriptHash = (flags.find('S') != std::string::npos);
404 }
405 else if (vStrInputParts.size() > numkeys + 4) {
406 // Validate that there were no more parameters passed
407 throw std::runtime_error("Too many parameters");
408 }
409
410 CScript scriptPubKey = GetScriptForMultisig(required, pubkeys);
411
412 if (bSegWit) {
413 for (const CPubKey& pubkey : pubkeys) {
414 if (!pubkey.IsCompressed()) {
415 throw std::runtime_error("Uncompressed pubkeys are not useable for SegWit outputs");
416 }
417 }
418 // Build a P2WSH with the multisig script
419 scriptPubKey = GetScriptForDestination(WitnessV0ScriptHash(scriptPubKey));
420 }
421 if (bScriptHash) {
422 if (scriptPubKey.size() > MAX_SCRIPT_ELEMENT_SIZE) {
423 throw std::runtime_error(strprintf(
424 "redeemScript exceeds size limit: %d > %d", scriptPubKey.size(), MAX_SCRIPT_ELEMENT_SIZE));
425 }
426 // Get the ID for the script, and then construct a P2SH destination for it.
427 scriptPubKey = GetScriptForDestination(ScriptHash(scriptPubKey));
428 }
429
430 // construct TxOut, append to transaction output list
431 CTxOut txout(value, scriptPubKey);
432 tx.vout.push_back(txout);
433 }
434
435 static void MutateTxAddOutData(CMutableTransaction& tx, const std::string& strInput)
436 {
437 CAmount value = 0;
438
439 // separate [VALUE:]DATA in string
440 size_t pos = strInput.find(':');
441
442 if (pos==0)
443 throw std::runtime_error("TX output value not specified");
444
445 if (pos == std::string::npos) {
446 pos = 0;
447 } else {
448 // Extract and validate VALUE
449 value = ExtractAndValidateValue(strInput.substr(0, pos));
450 ++pos;
451 }
452
453 // extract and validate DATA
454 const std::string strData{strInput.substr(pos, std::string::npos)};
455
456 if (!IsHex(strData))
457 throw std::runtime_error("invalid TX output data");
458
459 std::vector<unsigned char> data = ParseHex(strData);
460
461 CTxOut txout(value, CScript() << OP_RETURN << data);
462 tx.vout.push_back(txout);
463 }
464
465 static void MutateTxAddOutScript(CMutableTransaction& tx, const std::string& strInput)
466 {
467 // separate VALUE:SCRIPT[:FLAGS]
468 std::vector<std::string> vStrInputParts = SplitString(strInput, ':');
469 if (vStrInputParts.size() < 2)
470 throw std::runtime_error("TX output missing separator");
471
472 // Extract and validate VALUE
473 CAmount value = ExtractAndValidateValue(vStrInputParts[0]);
474
475 // extract and validate script
476 const std::string& strScript = vStrInputParts[1];
477 CScript scriptPubKey = ParseScript(strScript);
478
479 // Extract FLAGS
480 bool bSegWit = false;
481 bool bScriptHash = false;
482 if (vStrInputParts.size() == 3) {
483 const std::string& flags = vStrInputParts.back();
484 bSegWit = (flags.find('W') != std::string::npos);
485 bScriptHash = (flags.find('S') != std::string::npos);
486 }
487
488 if (scriptPubKey.size() > MAX_SCRIPT_SIZE) {
489 throw std::runtime_error(strprintf(
490 "script exceeds size limit: %d > %d", scriptPubKey.size(), MAX_SCRIPT_SIZE));
491 }
492
493 if (bSegWit) {
494 scriptPubKey = GetScriptForDestination(WitnessV0ScriptHash(scriptPubKey));
495 }
496 if (bScriptHash) {
497 if (scriptPubKey.size() > MAX_SCRIPT_ELEMENT_SIZE) {
498 throw std::runtime_error(strprintf(
499 "redeemScript exceeds size limit: %d > %d", scriptPubKey.size(), MAX_SCRIPT_ELEMENT_SIZE));
500 }
501 scriptPubKey = GetScriptForDestination(ScriptHash(scriptPubKey));
502 }
503
504 // construct TxOut, append to transaction output list
505 CTxOut txout(value, scriptPubKey);
506 tx.vout.push_back(txout);
507 }
508
509 static void MutateTxDelInput(CMutableTransaction& tx, const std::string& strInIdx)
510 {
511 const auto idx{ToIntegral<uint32_t>(strInIdx)};
512 if (!idx || idx >= tx.vin.size()) {
513 throw std::runtime_error("Invalid TX input index '" + strInIdx + "'");
514 }
515 tx.vin.erase(tx.vin.begin() + *idx);
516 }
517
518 static void MutateTxDelOutput(CMutableTransaction& tx, const std::string& strOutIdx)
519 {
520 const auto idx{ToIntegral<uint32_t>(strOutIdx)};
521 if (!idx || idx >= tx.vout.size()) {
522 throw std::runtime_error("Invalid TX output index '" + strOutIdx + "'");
523 }
524 tx.vout.erase(tx.vout.begin() + *idx);
525 }
526
527 static const unsigned int N_SIGHASH_OPTS = 7;
528 static const struct {
529 const char *flagStr;
530 int flags;
531 } sighashOptions[N_SIGHASH_OPTS] = {
532 {"DEFAULT", SIGHASH_DEFAULT},
533 {"ALL", SIGHASH_ALL},
534 {"NONE", SIGHASH_NONE},
535 {"SINGLE", SIGHASH_SINGLE},
536 {"ALL|ANYONECANPAY", SIGHASH_ALL|SIGHASH_ANYONECANPAY},
537 {"NONE|ANYONECANPAY", SIGHASH_NONE|SIGHASH_ANYONECANPAY},
538 {"SINGLE|ANYONECANPAY", SIGHASH_SINGLE|SIGHASH_ANYONECANPAY},
539 };
540
541 static bool findSighashFlags(int& flags, const std::string& flagStr)
542 {
543 flags = 0;
544
545 for (unsigned int i = 0; i < N_SIGHASH_OPTS; i++) {
546 if (flagStr == sighashOptions[i].flagStr) {
547 flags = sighashOptions[i].flags;
548 return true;
549 }
550 }
551
552 return false;
553 }
554
555 static CAmount AmountFromValue(const UniValue& value)
556 {
557 if (!value.isNum() && !value.isStr())
558 throw std::runtime_error("Amount is not a number or string");
559 int64_t amount;
560 if (!ParseFixedPoint(value.getValStr(), 8, &amount))
561 throw std::runtime_error("Invalid amount");
562 if (!MoneyRange(amount))
563 throw std::runtime_error("Amount out of range");
564 return amount;
565 }
566
567 static std::vector<unsigned char> ParseHexUV(const UniValue& v, const std::string& strName)
568 {
569 std::string strHex;
570 if (v.isStr())
571 strHex = v.getValStr();
572 if (!IsHex(strHex))
573 throw std::runtime_error(strName + " must be hexadecimal string (not '" + strHex + "')");
574 return ParseHex(strHex);
575 }
576
577 static void MutateTxSign(CMutableTransaction& tx, const std::string& flagStr)
578 {
579 int nHashType = SIGHASH_ALL;
580
581 if (flagStr.size() > 0)
582 if (!findSighashFlags(nHashType, flagStr))
583 throw std::runtime_error("unknown sighash flag/sign option");
584
585 // mergedTx will end up with all the signatures; it
586 // starts as a clone of the raw tx:
587 CMutableTransaction mergedTx{tx};
588 const CMutableTransaction txv{tx};
589 CCoinsViewCache view{&CoinsViewEmpty::Get()};
590
591 if (!registers.contains("privatekeys"))
592 throw std::runtime_error("privatekeys register variable must be set.");
593 FillableSigningProvider tempKeystore;
594 UniValue keysObj = registers["privatekeys"];
595
596 for (unsigned int kidx = 0; kidx < keysObj.size(); kidx++) {
597 if (!keysObj[kidx].isStr())
598 throw std::runtime_error("privatekey not a std::string");
599 CKey key = DecodeSecret(keysObj[kidx].getValStr());
600 if (!key.IsValid()) {
601 throw std::runtime_error("privatekey not valid");
602 }
603 tempKeystore.AddKey(key);
604 }
605
606 // Add previous txouts given in the RPC call:
607 if (!registers.contains("prevtxs"))
608 throw std::runtime_error("prevtxs register variable must be set.");
609 UniValue prevtxsObj = registers["prevtxs"];
610 {
611 for (unsigned int previdx = 0; previdx < prevtxsObj.size(); previdx++) {
612 const UniValue& prevOut = prevtxsObj[previdx];
613 if (!prevOut.isObject())
614 throw std::runtime_error("expected prevtxs internal object");
615
616 std::map<std::string, UniValue::VType> types = {
617 {"txid", UniValue::VSTR},
618 {"vout", UniValue::VNUM},
619 {"scriptPubKey", UniValue::VSTR},
620 };
621 if (!prevOut.checkObject(types))
622 throw std::runtime_error("prevtxs internal object typecheck fail");
623
624 auto txid{Txid::FromHex(prevOut["txid"].get_str())};
625 if (!txid) {
626 throw std::runtime_error("txid must be hexadecimal string (not '" + prevOut["txid"].get_str() + "')");
627 }
628
629 const int nOut = prevOut["vout"].getInt<int>();
630 if (nOut < 0)
631 throw std::runtime_error("vout cannot be negative");
632
633 COutPoint out(*txid, nOut);
634 std::vector<unsigned char> pkData(ParseHexUV(prevOut["scriptPubKey"], "scriptPubKey"));
635 CScript scriptPubKey(pkData.begin(), pkData.end());
636
637 {
638 const Coin& coin = view.AccessCoin(out);
639 if (!coin.IsSpent() && coin.out.scriptPubKey != scriptPubKey) {
640 std::string err("Previous output scriptPubKey mismatch:\n");
641 err = err + ScriptToAsmStr(coin.out.scriptPubKey) + "\nvs:\n"+
642 ScriptToAsmStr(scriptPubKey);
643 throw std::runtime_error(err);
644 }
645 Coin newcoin;
646 newcoin.out.scriptPubKey = scriptPubKey;
647 newcoin.out.nValue = MAX_MONEY;
648 if (prevOut.exists("amount")) {
649 newcoin.out.nValue = AmountFromValue(prevOut["amount"]);
650 }
651 newcoin.nHeight = 1;
652 view.AddCoin(out, std::move(newcoin), true);
653 }
654
655 // if redeemScript given and private keys given,
656 // add redeemScript to the tempKeystore so it can be signed:
657 if ((scriptPubKey.IsPayToScriptHash() || scriptPubKey.IsPayToWitnessScriptHash()) &&
658 prevOut.exists("redeemScript")) {
659 UniValue v = prevOut["redeemScript"];
660 std::vector<unsigned char> rsData(ParseHexUV(v, "redeemScript"));
661 CScript redeemScript(rsData.begin(), rsData.end());
662 tempKeystore.AddCScript(redeemScript);
663 }
664 }
665 }
666
667 const FillableSigningProvider& keystore = tempKeystore;
668
669 bool fHashSingle = ((nHashType & ~SIGHASH_ANYONECANPAY) == SIGHASH_SINGLE);
670
671 // Sign what we can:
672 for (unsigned int i = 0; i < mergedTx.vin.size(); i++) {
673 CTxIn& txin = mergedTx.vin[i];
674 const Coin& coin = view.AccessCoin(txin.prevout);
675 if (coin.IsSpent()) {
676 continue;
677 }
678 const CScript& prevPubKey = coin.out.scriptPubKey;
679 const CAmount& amount = coin.out.nValue;
680
681 SignatureData sigdata = DataFromTransaction(mergedTx, i, coin.out);
682 // Only sign SIGHASH_SINGLE if there's a corresponding output:
683 if (!fHashSingle || (i < mergedTx.vout.size()))
684 ProduceSignature(keystore, MutableTransactionSignatureCreator(mergedTx, i, amount, {.sighash_type = nHashType}), prevPubKey, sigdata);
685
686 if (amount == MAX_MONEY && !sigdata.scriptWitness.IsNull()) {
687 throw std::runtime_error(strprintf("Missing amount for CTxOut with scriptPubKey=%s", HexStr(prevPubKey)));
688 }
689
690 UpdateInput(txin, sigdata);
691 }
692
693 tx = mergedTx;
694 }
695
696 static void MutateTx(CMutableTransaction& tx, const std::string& command,
697 const std::string& commandVal)
698 {
699 std::unique_ptr<ECC_Context> ecc;
700
701 if (command == "nversion")
702 MutateTxVersion(tx, commandVal);
703 else if (command == "locktime")
704 MutateTxLocktime(tx, commandVal);
705 else if (command == "replaceable") {
706 MutateTxRBFOptIn(tx, commandVal);
707 }
708
709 else if (command == "delin")
710 MutateTxDelInput(tx, commandVal);
711 else if (command == "in")
712 MutateTxAddInput(tx, commandVal);
713
714 else if (command == "delout")
715 MutateTxDelOutput(tx, commandVal);
716 else if (command == "outaddr")
717 MutateTxAddOutAddr(tx, commandVal);
718 else if (command == "outpubkey") {
719 ecc.reset(new ECC_Context());
720 MutateTxAddOutPubKey(tx, commandVal);
721 } else if (command == "outmultisig") {
722 ecc.reset(new ECC_Context());
723 MutateTxAddOutMultiSig(tx, commandVal);
724 } else if (command == "outscript")
725 MutateTxAddOutScript(tx, commandVal);
726 else if (command == "outdata")
727 MutateTxAddOutData(tx, commandVal);
728
729 else if (command == "sign") {
730 ecc.reset(new ECC_Context());
731 MutateTxSign(tx, commandVal);
732 }
733
734 else if (command == "load")
735 RegisterLoad(commandVal);
736
737 else if (command == "set")
738 RegisterSet(commandVal);
739
740 else
741 throw std::runtime_error("unknown command");
742 }
743
744 static void OutputTxJSON(const CTransaction& tx)
745 {
746 UniValue entry(UniValue::VOBJ);
747 TxToUniv(tx, /*block_hash=*/uint256(), entry);
748
749 std::string jsonOutput = entry.write(4);
750 tfm::format(std::cout, "%s\n", jsonOutput);
751 }
752
753 static void OutputTxHash(const CTransaction& tx)
754 {
755 std::string strHexHash = tx.GetHash().GetHex(); // the hex-encoded transaction hash (aka the transaction id)
756
757 tfm::format(std::cout, "%s\n", strHexHash);
758 }
759
760 static void OutputTxHex(const CTransaction& tx)
761 {
762 std::string strHex = EncodeHexTx(tx);
763
764 tfm::format(std::cout, "%s\n", strHex);
765 }
766
767 static void OutputTx(const CTransaction& tx)
768 {
769 if (gArgs.GetBoolArg("-json", false))
770 OutputTxJSON(tx);
771 else if (gArgs.GetBoolArg("-txid", false))
772 OutputTxHash(tx);
773 else
774 OutputTxHex(tx);
775 }
776
777 static std::string readStdin()
778 {
779 char buf[4096];
780 std::string ret;
781
782 while (!feof(stdin)) {
783 size_t bread = fread(buf, 1, sizeof(buf), stdin);
784 ret.append(buf, bread);
785 if (bread < sizeof(buf))
786 break;
787 }
788
789 if (ferror(stdin))
790 throw std::runtime_error("error reading stdin");
791
792 return TrimString(ret);
793 }
794
795 static int CommandLineRawTx(int argc, char* argv[])
796 {
797 std::string strPrint;
798 int nRet = 0;
799 try {
800 // Skip switches; Permit common stdin convention "-"
801 while (argc > 1 && IsSwitchChar(argv[1][0]) &&
802 (argv[1][1] != 0)) {
803 argc--;
804 argv++;
805 }
806
807 CMutableTransaction tx;
808 int startArg;
809
810 if (!fCreateBlank) {
811 // require at least one param
812 if (argc < 2)
813 throw std::runtime_error("too few parameters");
814
815 // param: hex-encoded bitcoin transaction
816 std::string strHexTx(argv[1]);
817 if (strHexTx == "-") // "-" implies standard input
818 strHexTx = readStdin();
819
820 if (!DecodeHexTx(tx, strHexTx, true))
821 throw std::runtime_error("invalid transaction encoding");
822
823 startArg = 2;
824 } else
825 startArg = 1;
826
827 for (int i = startArg; i < argc; i++) {
828 std::string arg = argv[i];
829 std::string key, value;
830 size_t eqpos = arg.find('=');
831 if (eqpos == std::string::npos)
832 key = arg;
833 else {
834 key = arg.substr(0, eqpos);
835 value = arg.substr(eqpos + 1);
836 }
837
838 MutateTx(tx, key, value);
839 }
840
841 OutputTx(CTransaction(tx));
842 }
843 catch (const std::exception& e) {
844 strPrint = std::string("error: ") + e.what();
845 nRet = EXIT_FAILURE;
846 }
847 catch (...) {
848 PrintExceptionContinue(nullptr, "CommandLineRawTx()");
849 throw;
850 }
851
852 if (strPrint != "") {
853 tfm::format(nRet == 0 ? std::cout : std::cerr, "%s\n", strPrint);
854 }
855 return nRet;
856 }
857
858 MAIN_FUNCTION
859 {
860 SetupEnvironment();
861
862 try {
863 int ret = AppInitRawTx(argc, argv);
864 if (ret != CONTINUE_EXECUTION)
865 return ret;
866 }
867 catch (const std::exception& e) {
868 PrintExceptionContinue(&e, "AppInitRawTx()");
869 return EXIT_FAILURE;
870 } catch (...) {
871 PrintExceptionContinue(nullptr, "AppInitRawTx()");
872 return EXIT_FAILURE;
873 }
874
875 int ret = EXIT_FAILURE;
876 try {
877 ret = CommandLineRawTx(argc, argv);
878 }
879 catch (const std::exception& e) {
880 PrintExceptionContinue(&e, "CommandLineRawTx()");
881 } catch (...) {
882 PrintExceptionContinue(nullptr, "CommandLineRawTx()");
883 }
884 return ret;
885 }
886