src/core_write.cpp

   1 // Copyright (c) 2009-2015 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 "base58.h"
   8 #include "primitives/transaction.h"
   9 #include "script/script.h"
  10 #include "script/standard.h"
  11 #include "serialize.h"
  12 #include "streams.h"
  13 #include <univalue.h>
  14 #include "util.h"
  15 #include "utilmoneystr.h"
  16 #include "utilstrencodings.h"
  17
  18 #include <boost/assign/list_of.hpp>
  19 #include <boost/foreach.hpp>
  20
  21 using namespace std;
  22
  23 string FormatScript(const CScript& script)
  24 {
  25     string ret;
  26     CScript::const_iterator it = script.begin();
  27     opcodetype op;
  28     while (it != script.end()) {
  29         CScript::const_iterator it2 = it;
  30         vector<unsigned char> vch;
  31         if (script.GetOp2(it, op, &vch)) {
  32             if (op == OP_0) {
  33                 ret += "0 ";
  34                 continue;
  35             } else if ((op >= OP_1 && op <= OP_16) || op == OP_1NEGATE) {
  36                 ret += strprintf("%i ", op - OP_1NEGATE - 1);
  37                 continue;
  38             } else if (op >= OP_NOP && op <= OP_NOP10) {
  39                 string str(GetOpName(op));
  40                 if (str.substr(0, 3) == string("OP_")) {
  41                     ret += str.substr(3, string::npos) + " ";
  42                     continue;
  43                 }
  44             }
  45             if (vch.size() > 0) {
  46                 ret += strprintf("0x%x 0x%x ", HexStr(it2, it - vch.size()), HexStr(it - vch.size(), it));
  47             } else {
  48                 ret += strprintf("0x%x ", HexStr(it2, it));
  49             }
  50             continue;
  51         }
  52         ret += strprintf("0x%x ", HexStr(it2, script.end()));
  53         break;
  54     }
  55     return ret.substr(0, ret.size() - 1);
  56 }
  57
  58 const map<unsigned char, string> mapSigHashTypes =
  59     boost::assign::map_list_of
  60     (static_cast<unsigned char>(SIGHASH_ALL), string("ALL"))
  61     (static_cast<unsigned char>(SIGHASH_ALL|SIGHASH_ANYONECANPAY), string("ALL|ANYONECANPAY"))
  62     (static_cast<unsigned char>(SIGHASH_NONE), string("NONE"))
  63     (static_cast<unsigned char>(SIGHASH_NONE|SIGHASH_ANYONECANPAY), string("NONE|ANYONECANPAY"))
  64     (static_cast<unsigned char>(SIGHASH_SINGLE), string("SINGLE"))
  65     (static_cast<unsigned char>(SIGHASH_SINGLE|SIGHASH_ANYONECANPAY), string("SINGLE|ANYONECANPAY"))
  66     ;
  67
  68 /**
  69  * Create the assembly string representation of a CScript object.
  70  * @param[in] script    CScript object to convert into the asm string representation.
  71  * @param[in] fAttemptSighashDecode    Whether to attempt to decode sighash types on data within the script that matches the format
  72  *                                     of a signature. Only pass true for scripts you believe could contain signatures. For example,
  73  *                                     pass false, or omit the this argument (defaults to false), for scriptPubKeys.
  74  */
  75 string ScriptToAsmStr(const CScript& script, const bool fAttemptSighashDecode)
  76 {
  77     string str;
  78     opcodetype opcode;
  79     vector<unsigned char> vch;
  80     CScript::const_iterator pc = script.begin();
  81     while (pc < script.end()) {
  82         if (!str.empty()) {
  83             str += " ";
  84         }
  85         if (!script.GetOp(pc, opcode, vch)) {
  86             str += "[error]";
  87             return str;
  88         }
  89         if (0 <= opcode && opcode <= OP_PUSHDATA4) {
  90             if (vch.size() <= static_cast<vector<unsigned char>::size_type>(4)) {
  91                 str += strprintf("%d", CScriptNum(vch, false).getint());
  92             } else {
  93                 // the IsUnspendable check makes sure not to try to decode OP_RETURN data that may match the format of a signature
  94                 if (fAttemptSighashDecode && !script.IsUnspendable()) {
  95                     string strSigHashDecode;
  96                     // goal: only attempt to decode a defined sighash type from data that looks like a signature within a scriptSig.
  97                     // this won't decode correctly formatted public keys in Pubkey or Multisig scripts due to
  98                     // the restrictions on the pubkey formats (see IsCompressedOrUncompressedPubKey) being incongruous with the
  99                     // checks in CheckSignatureEncoding.
 100                     if (CheckSignatureEncoding(vch, SCRIPT_VERIFY_STRICTENC, NULL)) {
 101                         const unsigned char chSigHashType = vch.back();
 102                         if (mapSigHashTypes.count(chSigHashType)) {
 103                             strSigHashDecode = "[" + mapSigHashTypes.find(chSigHashType)->second + "]";
 104                             vch.pop_back(); // remove the sighash type byte. it will be replaced by the decode.
 105                         }
 106                     }
 107                     str += HexStr(vch) + strSigHashDecode;
 108                 } else {
 109                     str += HexStr(vch);
 110                 }
 111             }
 112         } else {
 113             str += GetOpName(opcode);
 114         }
 115     }
 116     return str;
 117 }
 118
 119 string EncodeHexTx(const CTransaction& tx, const int serialFlags)
 120 {
 121     CDataStream ssTx(SER_NETWORK, PROTOCOL_VERSION | serialFlags);
 122     ssTx << tx;
 123     return HexStr(ssTx.begin(), ssTx.end());
 124 }
 125
 126 void ScriptPubKeyToUniv(const CScript& scriptPubKey,
 127                         UniValue& out, bool fIncludeHex)
 128 {
 129     txnouttype type;
 130     vector<CTxDestination> addresses;
 131     int nRequired;
 132
 133     out.pushKV("asm", ScriptToAsmStr(scriptPubKey));
 134     if (fIncludeHex)
 135         out.pushKV("hex", HexStr(scriptPubKey.begin(), scriptPubKey.end()));
 136
 137     if (!ExtractDestinations(scriptPubKey, type, addresses, nRequired)) {
 138         out.pushKV("type", GetTxnOutputType(type));
 139         return;
 140     }
 141
 142     out.pushKV("reqSigs", nRequired);
 143     out.pushKV("type", GetTxnOutputType(type));
 144
 145     UniValue a(UniValue::VARR);
 146     BOOST_FOREACH(const CTxDestination& addr, addresses)
 147         a.push_back(CBitcoinAddress(addr).ToString());
 148     out.pushKV("addresses", a);
 149 }
 150
 151 void TxToUniv(const CTransaction& tx, const uint256& hashBlock, UniValue& entry)
 152 {
 153     entry.pushKV("txid", tx.GetHash().GetHex());
 154     entry.pushKV("hash", tx.GetWitnessHash().GetHex());
 155     entry.pushKV("version", tx.nVersion);
 156     entry.pushKV("locktime", (int64_t)tx.nLockTime);
 157
 158     UniValue vin(UniValue::VARR);
 159     for (unsigned int i = 0; i < tx.vin.size(); i++) {
 160         const CTxIn& txin = tx.vin[i];
 161         UniValue in(UniValue::VOBJ);
 162         if (tx.IsCoinBase())
 163             in.pushKV("coinbase", HexStr(txin.scriptSig.begin(), txin.scriptSig.end()));
 164         else {
 165             in.pushKV("txid", txin.prevout.hash.GetHex());
 166             in.pushKV("vout", (int64_t)txin.prevout.n);
 167             UniValue o(UniValue::VOBJ);
 168             o.pushKV("asm", ScriptToAsmStr(txin.scriptSig, true));
 169             o.pushKV("hex", HexStr(txin.scriptSig.begin(), txin.scriptSig.end()));
 170             in.pushKV("scriptSig", o);
 171             if (!tx.wit.IsNull() && i < tx.wit.vtxinwit.size() && !tx.wit.vtxinwit[i].IsNull()) {
 172                 UniValue txinwitness(UniValue::VARR);
 173                 for (const auto& item : tx.wit.vtxinwit[i].scriptWitness.stack) {
 174                     txinwitness.push_back(HexStr(item.begin(), item.end()));
 175                 }
 176                 in.pushKV("txinwitness", txinwitness);
 177             }
 178         }
 179         in.pushKV("sequence", (int64_t)txin.nSequence);
 180         vin.push_back(in);
 181     }
 182     entry.pushKV("vin", vin);
 183
 184     UniValue vout(UniValue::VARR);
 185     for (unsigned int i = 0; i < tx.vout.size(); i++) {
 186         const CTxOut& txout = tx.vout[i];
 187
 188         UniValue out(UniValue::VOBJ);
 189
 190         UniValue outValue(UniValue::VNUM, FormatMoney(txout.nValue));
 191         out.pushKV("value", outValue);
 192         out.pushKV("n", (int64_t)i);
 193
 194         UniValue o(UniValue::VOBJ);
 195         ScriptPubKeyToUniv(txout.scriptPubKey, o, true);
 196         out.pushKV("scriptPubKey", o);
 197         vout.push_back(out);
 198     }
 199     entry.pushKV("vout", vout);
 200
 201     if (!hashBlock.IsNull())
 202         entry.pushKV("blockhash", hashBlock.GetHex());
 203
 204     entry.pushKV("hex", EncodeHexTx(tx)); // the hex-encoded transaction. used the name "hex" to be consistent with the verbose output of "getrawtransaction".
 205 }