bitcoin/src/bitcoin-tx.cpp at master · simdeveloper/bitcoin

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// Distributed under the MIT software license, see the accompanying

// file COPYING or http://www.opensource.org/licenses/mit-license.php.

#include "base58.h"

#include "clientversion.h"

#include "coins.h"

#include "consensus/consensus.h"

#include "core_io.h"

#include "keystore.h"

#include "policy/policy.h"

#include "primitives/transaction.h"

#include "script/script.h"

#include "script/sign.h"

#include "univalue/univalue.h"

#include "util.h"

#include "utilmoneystr.h"

#include "utilstrencodings.h"

#include <stdio.h>

#include <boost/algorithm/string.hpp>

#include <boost/assign/list_of.hpp>

using namespace std;

static bool fCreateBlank;

static map<string,UniValue> registers;

static bool AppInitRawTx(int argc, char* argv[])

{

// Parameters

ParseParameters(argc, argv);

// Check for -testnet or -regtest parameter (Params() calls are only valid after this clause)

if (!SelectParamsFromCommandLine()) {

fprintf(stderr, "Error: Invalid combination of -regtest and -testnet.\n");

return false;

}

fCreateBlank = GetBoolArg("-create", false);

if (argc<2 || mapArgs.count("-?") || mapArgs.count("-help"))

{

// First part of help message is specific to this utility

std::string strUsage = _("Bitcoin Core bitcoin-tx utility version") + " " + FormatFullVersion() + "\n\n" +

_("Usage:") + "\n" +

" bitcoin-tx [options] <hex-tx> [commands] " + _("Update hex-encoded bitcoin transaction") + "\n" +

" bitcoin-tx [options] -create [commands] " + _("Create hex-encoded bitcoin transaction") + "\n" +

"\n";

fprintf(stdout, "%s", strUsage.c_str());

strUsage = HelpMessageGroup(_("Options:"));

strUsage += HelpMessageOpt("-?", _("This help message"));

strUsage += HelpMessageOpt("-create", _("Create new, empty TX."));

strUsage += HelpMessageOpt("-json", _("Select JSON output"));

strUsage += HelpMessageOpt("-txid", _("Output only the hex-encoded transaction id of the resultant transaction."));

strUsage += HelpMessageOpt("-regtest", _("Enter regression test mode, which uses a special chain in which blocks can be solved instantly."));

strUsage += HelpMessageOpt("-testnet", _("Use the test network"));

fprintf(stdout, "%s", strUsage.c_str());

strUsage = HelpMessageGroup(_("Commands:"));

strUsage += HelpMessageOpt("delin=N", _("Delete input N from TX"));

strUsage += HelpMessageOpt("delout=N", _("Delete output N from TX"));

strUsage += HelpMessageOpt("in=TXID:VOUT", _("Add input to TX"));

strUsage += HelpMessageOpt("locktime=N", _("Set TX lock time to N"));

strUsage += HelpMessageOpt("nversion=N", _("Set TX version to N"));

strUsage += HelpMessageOpt("outaddr=VALUE:ADDRESS", _("Add address-based output to TX"));

strUsage += HelpMessageOpt("outdata=[VALUE:]DATA", _("Add data-based output to TX"));

strUsage += HelpMessageOpt("outscript=VALUE:SCRIPT", _("Add raw script output to TX"));

strUsage += HelpMessageOpt("sign=SIGHASH-FLAGS", _("Add zero or more signatures to transaction") + ". " +

_("This command requires JSON registers:") +

_("prevtxs=JSON object") + ", " +

_("privatekeys=JSON object") + ". " +

_("See signrawtransaction docs for format of sighash flags, JSON objects.")) 10BC0 ;

fprintf(stdout, "%s", strUsage.c_str());

strUsage = HelpMessageGroup(_("Register Commands:"));

strUsage += HelpMessageOpt("load=NAME:FILENAME", _("Load JSON file FILENAME into register NAME"));

strUsage += HelpMessageOpt("set=NAME:JSON-STRING", _("Set register NAME to given JSON-STRING"));

fprintf(stdout, "%s", strUsage.c_str());

return false;

}

return true;

}

static void RegisterSetJson(const string& key, const string& rawJson)

{

UniValue val;

if (!val.read(rawJson)) {

string strErr = "Cannot parse JSON for key " + key;

throw runtime_error(strErr);

}

registers[key] = val;

}

static void RegisterSet(const string& strInput)

{

// separate NAME:VALUE in string

size_t pos = strInput.find(':');

if ((pos == string::npos) ||

(pos == 0) ||

(pos == (strInput.size() - 1)))

throw runtime_error("Register input requires NAME:VALUE");

string key = strInput.substr(0, pos);

string valStr = strInput.substr(pos + 1, string::npos);

RegisterSetJson(key, valStr);

}

static void RegisterLoad(const string& strInput)

{

// separate NAME:FILENAME in string

size_t pos = strInput.find(':');

if ((pos == string::npos) ||

(pos == 0) ||

(pos == (strInput.size() - 1)))

throw runtime_error("Register load requires NAME:FILENAME");

string key = strInput.substr(0, pos);

string filename = strInput.substr(pos + 1, string::npos);

FILE *f = fopen(filename.c_str(), "r");

if (!f) {

string strErr = "Cannot open file " + filename;

throw runtime_error(strErr);

}

// load file chunks into one big buffer

string valStr;

while ((!feof(f)) && (!ferror(f))) {

char buf[4096];

int bread = fread(buf, 1, sizeof(buf), f);

if (bread <= 0)

break;

valStr.insert(valStr.size(), buf, bread);

}

int error = ferror(f);

fclose(f);

if (error) {

string strErr = "Error reading file " + filename;

throw runtime_error(strErr);

}

// evaluate as JSON buffer register

RegisterSetJson(key, valStr);

}

static void MutateTxVersion(CMutableTransaction& tx, const string& cmdVal)

{

int64_t newVersion = atoi64(cmdVal);

if (newVersion < 1 || newVersion > CTransaction::CURRENT_VERSION)

throw runtime_error("Invalid TX version requested");

tx.nVersion = (int) newVersion;

}

static void MutateTxLocktime(CMutableTransaction& tx, const string& cmdVal)

{

int64_t newLocktime = atoi64(cmdVal);

if (newLocktime < 0LL || newLocktime > 0xffffffffLL)

throw runtime_error("Invalid TX locktime requested");

tx.nLockTime = (unsigned int) newLocktime;

}

static void MutateTxAddInput(CMutableTransaction& tx, const string& strInput)

{

// separate TXID:VOUT in string

size_t pos = strInput.find(':');

if ((pos == string::npos) ||

(pos == 0) ||

(pos == (strInput.size() - 1)))

throw runtime_error("TX input missing separator");

// extract and validate TXID

string strTxid = strInput.substr(0, pos);

if ((strTxid.size() != 64) || !IsHex(strTxid))

throw runtime_error("invalid TX input txid");

uint256 txid(uint256S(strTxid));

static const unsigned int minTxOutSz = 9;

static const unsigned int maxVout = MAX_BLOCK_SIZE / minTxOutSz;

// extract and validate vout

string strVout = strInput.substr(pos + 1, string::npos);

int vout = atoi(strVout);

if ((vout < 0) || (vout > (int)maxVout))

throw runtime_error("invalid TX input vout");

// append to transaction input list

CTxIn txin(txid, vout);

tx.vin.push_back(txin);

}

static void MutateTxAddOutAddr(CMutableTransaction& tx, const string& strInput)

{

// separate VALUE:ADDRESS in string

size_t pos = strInput.find(':');

if ((pos == string::npos) ||

(pos == 0) ||

(pos == (strInput.size() - 1)))

throw runtime_error("TX output missing separator");

// extract and validate VALUE

string strValue = strInput.substr(0, pos);

CAmount value;

if (!ParseMoney(strValue, value))

throw runtime_error("invalid TX output value");

// extract and validate ADDRESS

string strAddr = strInput.substr(pos + 1, string::npos);

CBitcoinAddress addr(strAddr);

if (!addr.IsValid())

throw runtime_error("invalid TX output address");

// build standard output script via GetScriptForDestination()

CScript scriptPubKey = GetScriptForDestination(addr.Get());

// construct TxOut, append to transaction output list

CTxOut txout(value, scriptPubKey);

tx.vout.push_back(txout);

}

static void MutateTxAddOutData(CMutableTransaction& tx, const string& strInput)

{

CAmount value = 0;

// separate [VALUE:]DATA in string

size_t pos = strInput.find(':');

if (pos==0)

throw runtime_error("TX output value not specified");

if (pos != string::npos) {

// extract and validate VALUE

string strValue = strInput.substr(0, pos);

if (!ParseMoney(strValue, value))

throw runtime_error("invalid TX output value");

}

// extract and validate DATA

string strData = strInput.substr(pos + 1, string::npos);

if (!IsHex(strData))

throw runtime_error("invalid TX output data");

std::vector<unsigned char> data = ParseHex(strData);

CTxOut txout(value, CScript() << OP_RETURN << data);

tx.vout.push_back(txout);

}

static void MutateTxAddOutScript(CMutableTransaction& tx, const string& strInput)

{

// separate VALUE:SCRIPT in string

size_t pos = strInput.find(':');

if ((pos == string::npos) ||

(pos == 0))

throw runtime_error("TX output missing separator");

// extract and validate VALUE

string strValue = strInput.substr(0, pos);

CAmount value;

if (!ParseMoney(strValue, value))

throw runtime_error("invalid TX output value");

// extract and validate script

string strScript = strInput.substr(pos + 1, string::npos);

CScript scriptPubKey = ParseScript(strScript); // throws on err

// construct TxOut, append to transaction output list

CTxOut txout(value, scriptPubKey);

tx.vout.push_back(txout);

}

static void MutateTxDelInput(CMutableTransaction& tx, const string& strInIdx)

{

// parse requested deletion index

int inIdx = atoi(strInIdx);

if (inIdx < 0 || inIdx >= (int)tx.vin.size()) {

string strErr = "Invalid TX input index '" + strInIdx + "'";

throw runtime_error(strErr.c_str());

}

// delete input from transaction

tx.vin.erase(tx.vin.begin() + inIdx);

}

static void MutateTxDelOutput(CMutableTransaction& tx, const string& strOutIdx)

{

// parse requested deletion index

int outIdx = atoi(strOutIdx);

if (outIdx < 0 || outIdx >= (int)tx.vout.size()) {

string strErr = "Invalid TX output index '" + strOutIdx + "'";

throw runtime_error(strErr.c_str());

}

// delete output from transaction

tx.vout.erase(tx.vout.begin() + outIdx);

}

static const unsigned int N_SIGHASH_OPTS = 6;

static const struct {

const char *flagStr;

int flags;

} sighashOptions[N_SIGHASH_OPTS] = {

{"ALL", SIGHASH_ALL},

{"NONE", SIGHASH_NONE},

{"SINGLE", SIGHASH_SINGLE},

{"ALL|ANYONECANPAY", SIGHASH_ALL|SIGHASH_ANYONECANPAY},

{"NONE|ANYONECANPAY", SIGHASH_NONE|SIGHASH_ANYONECANPAY},

{"SINGLE|ANYONECANPAY", SIGHASH_SINGLE|SIGHASH_ANYONECANPAY},

};

static bool findSighashFlags(int& flags, const string& flagStr)

{

flags = 0;

for (unsigned int i = 0; i < N_SIGHASH_OPTS; i++) {

if (flagStr == sighashOptions[i].flagStr) {

flags = sighashOptions[i].flags;

return true;

}

return false;

}

uint256 ParseHashUO(map<string,UniValue>& o, string strKey)

{

if (!o.count(strKey))

return uint256();

return ParseHashUV(o[strKey], strKey);

}

vector<unsigned char> ParseHexUO(map<string,UniValue>& o, string strKey)

{

if (!o.count(strKey)) {

vector<unsigned char> emptyVec;

return emptyVec;

}

return ParseHexUV(o[strKey], strKey);

}

static void MutateTxSign(CMutableTransaction& tx, const string& flagStr)

{

int nHashType = SIGHASH_ALL;

if (flagStr.size() > 0)

if (!findSighashFlags(nHashType, flagStr))

throw runtime_error("unknown sighash flag/sign option");

vector<CTransaction> txVariants;

txVariants.push_back(tx);

// mergedTx will end up with all the signatures; it

// starts as a clone of the raw tx:

CMutableTransaction mergedTx(txVariants[0]);

bool fComplete = true;

CCoinsView viewDummy;

CCoinsViewCache view(&viewDummy);

if (!registers.count("privatekeys"))

throw runtime_error("privatekeys register variable must be set.");

bool fGivenKeys = false;

CBasicKeyStore tempKeystore;

UniValue keysObj = registers["privatekeys"];

fGivenKeys = true;

for (unsigned int kidx = 0; kidx < keysObj.size(); kidx++) {

if (!keysObj[kidx].isStr())

throw runtime_error("privatekey not a string");

CBitcoinSecret vchSecret;

bool fGood = vchSecret.SetString(keysObj[kidx].getValStr());

if (!fGood)

throw runtime_error("privatekey not valid");

CKey key = vchSecret.GetKey();

tempKeystore.AddKey(key);

}

// Add previous txouts given in the RPC call:

if (!registers.count("prevtxs"))

throw runtime_error("prevtxs register variable must be set.");

UniValue prevtxsObj = registers["prevtxs"];

{

for (unsigned int previdx = 0; previdx < prevtxsObj.size(); previdx++) {

UniValue prevOut = prevtxsObj[previdx];

if (!prevOut.isObject())

throw runtime_error("expected prevtxs internal object");

map<string,UniValue::VType> types = boost::assign::map_list_of("txid", UniValue::VSTR)("vout",UniValue::VNUM)("scriptPubKey",UniValue::VSTR);

if (!prevOut.checkObject(types))

throw runtime_error("prevtxs internal object typecheck fail");

uint256 txid = ParseHashUV(prevOut["txid"], "txid");

int nOut = atoi(prevOut["vout"].getValStr());

if (nOut < 0)

throw runtime_error("vout must be positive");

vector<unsigned char> pkData(ParseHexUV(prevOut["scriptPubKey"], "scriptPubKey"));

CScript scriptPubKey(pkData.begin(), pkData.end());

{

CCoinsModifier coins = view.ModifyCoins(txid);

if (coins->IsAvailable(nOut) && coins->vout[nOut].scriptPubKey != scriptPubKey) {

string err("Previous output scriptPubKey mismatch:\n");

err = err + ScriptToAsmStr(coins->vout[nOut].scriptPubKey) + "\nvs:\n"+

ScriptToAsmStr(scriptPubKey);

throw runtime_error(err);

}

if ((unsigned int)nOut >= coins->vout.size())

coins->vout.resize(nOut+1);

coins->vout[nOut].scriptPubKey = scriptPubKey;

coins->vout[nOut].nValue = 0; // we don't know the actual output value

}

// if redeemScript given and private keys given,

// add redeemScript to the tempKeystore so it can be signed:

if (fGivenKeys && scriptPubKey.IsPayToScriptHash() &&

prevOut.exists("redeemScript")) {

UniValue v = prevOut["redeemScript"];

vector<unsigned char> rsData(ParseHexUV(v, "redeemScript"));

CScript redeemScript(rsData.begin(), rsData.end());

tempKeystore.AddCScript(redeemScript);

}

const CKeyStore& keystore = tempKeystore;

bool fHashSingle = ((nHashType & ~SIGHASH_ANYONECANPAY) == SIGHASH_SINGLE);

// Sign what we can:

for (unsigned int i = 0; i < mergedTx.vin.size(); i++) {

CTxIn& txin = mergedTx.vin[i];

const CCoins* coins = view.AccessCoins(txin.prevout.hash);

if (!coins || !coins->IsAvailable(txin.prevout.n)) {

fComplete = false;

continue;

}

const CScript& prevPubKey = coins->vout[txin.prevout.n].scriptPubKey;

txin.scriptSig.clear();

// Only sign SIGHASH_SINGLE if there's a corresponding output:

if (!fHashSingle || (i < mergedTx.vout.size()))

SignSignature(keystore, prevPubKey, mergedTx, i, nHashType);

// ... and merge in other signatures:

BOOST_FOREACH(const CTransaction& txv, txVariants) {

txin.scriptSig = CombineSignatures(prevPubKey, mergedTx, i, txin.scriptSig, txv.vin[i].scriptSig);

}

if (!VerifyScript(txin.scriptSig, prevPubKey, STANDARD_SCRIPT_VERIFY_FLAGS, MutableTransactionSignatureChecker(&mergedTx, i)))

fComplete = false;

}

if (fComplete) {

// do nothing... for now

// perhaps store this for later optional JSON output

}

tx = mergedTx;

}

class Secp256k1Init

{

public:

Secp256k1Init() { ECC_Start(); }

~Secp256k1Init() { ECC_Stop(); }

};

static void MutateTx(CMutableTransaction& tx, const string& command,

const string& commandVal)

{

boost::scoped_ptr<Secp256k1Init> ecc;

if (command == "nversion")

MutateTxVersion(tx, commandVal);

else if (command == "locktime")

MutateTxLocktime(tx, commandVal);

else if (command == "delin")

MutateTxDelInput(tx, commandVal);

else if (command == "in")

MutateTxAddInput(tx, commandVal);

else if (command == "delout")

MutateTxDelOutput(tx, commandVal);

else if (command == "outaddr")

MutateTxAddOutAddr(tx, commandVal);

else if (command == "outdata")

MutateTxAddOutData(tx, commandVal);

else if (command == "outscript")

MutateTxAddOutScript(tx, commandVal);

else if (command == "sign") {

if (!ecc) { ecc.reset(new Secp256k1Init()); }

MutateTxSign(tx, commandVal);

}

else if (command == "load")

RegisterLoad(commandVal);

else if (command == "set")

RegisterSet(commandVal);

else

throw runtime_error("unknown command");

}

static void OutputTxJSON(const CTransaction& tx)

{

UniValue entry(UniValue::VOBJ);

TxToUniv(tx, uint256(), entry);

string jsonOutput = entry.write(4);

fprintf(stdout, "%s\n", jsonOutput.c_str());

}

static void OutputTxHash(const CTransaction& tx)

{

string strHexHash = tx.GetHash().GetHex(); // the hex-encoded transaction hash (aka the transaction id)

fprintf(stdout, "%s\n", strHexHash.c_str());

}

static void OutputTxHex(const CTransaction& tx)

{

string strHex = EncodeHexTx(tx);

fprintf(stdout, "%s\n", strHex.c_str());

}

static void OutputTx(const CTransaction& tx)

{

if (GetBoolArg("-json", false))

OutputTxJSON(tx);

else if (GetBoolArg("-txid", false))

OutputTxHash(tx);

else

OutputTxHex(tx);

}

static string readStdin()

{

char buf[4096];

string ret;

while (!feof(stdin)) {

size_t bread = fread(buf, 1, sizeof(buf), stdin);

ret.append(buf, bread);

if (bread < sizeof(buf))

break;

}

if (ferror(stdin))

throw runtime_error("error reading stdin");

boost::algorithm::trim_right(ret);

return ret;

}

static int CommandLineRawTx(int argc, char* argv[])

{

string strPrint;

int nRet = 0;

try {

// Skip switches; Permit common stdin convention "-"

while (argc > 1 && IsSwitchChar(argv[1][0]) &&

(argv[1][1] != 0)) {

argc--;

argv++;

}

CTransaction txDecodeTmp;

int startArg;

if (!fCreateBlank) {

// require at least one param

if (argc < 2)

throw runtime_error("too few parameters");

// param: hex-encoded bitcoin transaction

string strHexTx(argv[1]);

if (strHexTx == "-") // "-" implies standard input

strHexTx = readStdin();

if (!DecodeHexTx(txDecodeTmp, strHexTx))

throw runtime_error("invalid transaction encoding");

startArg = 2;

} else

startArg = 1;

CMutableTransaction tx(txDecodeTmp);

for (int i = startArg; i < argc; i++) {

string arg = argv[i];

string key, value;

size_t eqpos = arg.find('=');

if (eqpos == string::npos)

key = arg;

else {

key = arg.substr(0, eqpos);

value = arg.substr(eqpos + 1);

}

MutateTx(tx, key, value);

}

OutputTx(tx);

}

catch (const boost::thread_interrupted&) {

throw;

}

catch (const std::exception& e) {

strPrint = string("error: ") + e.what();

nRet = EXIT_FAILURE;

}

catch (...) {

PrintExceptionContinue(NULL, "CommandLineRawTx()");

throw;

}

if (strPrint != "") {

fprintf((nRet == 0 ? stdout : stderr), "%s\n", strPrint.c_str());

}

return nRet;

}

int main(int argc, char* argv[])

{

SetupEnvironment();

try {

if(!AppInitRawTx(argc, argv))

return EXIT_FAILURE;

}

catch (const std::exception& e) {

PrintExceptionContinue(&e, "AppInitRawTx()");

return EXIT_FAILURE;

} catch (...) {

PrintExceptionContinue(NULL, "AppInitRawTx()");

return EXIT_FAILURE;

}

int ret = EXIT_FAILURE;

try {

ret = CommandLineRawTx(argc, argv);

}

catch (const std::exception& e) {

PrintExceptionContinue(&e, "CommandLineRawTx()");

} catch (...) {

PrintExceptionContinue(NULL, "CommandLineRawTx()");

}

return ret;

}

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