src/core_read.cpp

   1 // Copyright (c) 2009-2016 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 "serialize.h"
  11 #include "streams.h"
  12 #include <univalue.h>
  13 #include "util.h"
  14 #include "utilstrencodings.h"
  15 #include "version.h"
  16
  17 #include <boost/algorithm/string/classification.hpp>
  18 #include <boost/algorithm/string/predicate.hpp>
  19 #include <boost/algorithm/string/replace.hpp>
  20 #include <boost/algorithm/string/split.hpp>
  21
  22 CScript ParseScript(const std::string& s)
  23 {
  24     CScript result;
  25
  26     static std::map<std::string, opcodetype> mapOpNames;
  27
  28     if (mapOpNames.empty())
  29     {
  30         for (unsigned int op = 0; op <= MAX_OPCODE; op++)
  31         {
  32             // Allow OP_RESERVED to get into mapOpNames
  33             if (op < OP_NOP && op != OP_RESERVED)
  34                 continue;
  35
  36             const char* name = GetOpName((opcodetype)op);
  37             if (strcmp(name, "OP_UNKNOWN") == 0)
  38                 continue;
  39             std::string strName(name);
  40             mapOpNames[strName] = (opcodetype)op;
  41             // Convenience: OP_ADD and just ADD are both recognized:
  42             boost::algorithm::replace_first(strName, "OP_", "");
  43             mapOpNames[strName] = (opcodetype)op;
  44         }
  45     }
  46
  47     std::vector<std::string> words;
  48     boost::algorithm::split(words, s, boost::algorithm::is_any_of(" \t\n"), boost::algorithm::token_compress_on);
  49
  50     for (std::vector<std::string>::const_iterator w = words.begin(); w != words.end(); ++w)
  51     {
  52         if (w->empty())
  53         {
  54             // Empty string, ignore. (boost::split given '' will return one word)
  55         }
  56         else if (all(*w, boost::algorithm::is_digit()) ||
  57             (boost::algorithm::starts_with(*w, "-") && all(std::string(w->begin()+1, w->end()), boost::algorithm::is_digit())))
  58         {
  59             // Number
  60             int64_t n = atoi64(*w);
  61             result << n;
  62         }
  63         else if (boost::algorithm::starts_with(*w, "0x") && (w->begin()+2 != w->end()) && IsHex(std::string(w->begin()+2, w->end())))
  64         {
  65             // Raw hex data, inserted NOT pushed onto stack:
  66             std::vector<unsigned char> raw = ParseHex(std::string(w->begin()+2, w->end()));
  67             result.insert(result.end(), raw.begin(), raw.end());
  68         }
  69         else if (w->size() >= 2 && boost::algorithm::starts_with(*w, "'") && boost::algorithm::ends_with(*w, "'"))
  70         {
  71             // Single-quoted string, pushed as data. NOTE: this is poor-man's
  72             // parsing, spaces/tabs/newlines in single-quoted strings won't work.
  73             std::vector<unsigned char> value(w->begin()+1, w->end()-1);
  74             result << value;
  75         }
  76         else if (mapOpNames.count(*w))
  77         {
  78             // opcode, e.g. OP_ADD or ADD:
  79             result << mapOpNames[*w];
  80         }
  81         else
  82         {
  83             throw std::runtime_error("script parse error");
  84         }
  85     }
  86
  87     return result;
  88 }
  89
  90 // Check that all of the input and output scripts of a transaction contains valid opcodes
  91 bool CheckTxScriptsSanity(const CMutableTransaction& tx)
  92 {
  93     // Check input scripts for non-coinbase txs
  94     if (!CTransaction(tx).IsCoinBase()) {
  95         for (unsigned int i = 0; i < tx.vin.size(); i++) {
  96             if (!tx.vin[i].scriptSig.HasValidOps() || tx.vin[i].scriptSig.size() > MAX_SCRIPT_SIZE) {
  97                 return false;
  98             }
  99         }
 100     }
 101     // Check output scripts
 102     for (unsigned int i = 0; i < tx.vout.size(); i++) {
 103         if (!tx.vout[i].scriptPubKey.HasValidOps() || tx.vout[i].scriptPubKey.size() > MAX_SCRIPT_SIZE) {
 104             return false;
 105         }
 106     }
 107
 108     return true;
 109 }
 110
 111 bool DecodeHexTx(CMutableTransaction& tx, const std::string& strHexTx, bool fTryNoWitness)
 112 {
 113     if (!IsHex(strHexTx)) {
 114         return false;
 115     }
 116
 117     std::vector<unsigned char> txData(ParseHex(strHexTx));
 118
 119     if (fTryNoWitness) {
 120         CDataStream ssData(txData, SER_NETWORK, PROTOCOL_VERSION | SERIALIZE_TRANSACTION_NO_WITNESS);
 121         try {
 122             ssData >> tx;
 123             if (ssData.eof() && CheckTxScriptsSanity(tx)) {
 124                 return true;
 125             }
 126         }
 127         catch (const std::exception&) {
 128             // Fall through.
 129         }
 130     }
 131
 132     CDataStream ssData(txData, SER_NETWORK, PROTOCOL_VERSION);
 133     try {
 134         ssData >> tx;
 135         if (!ssData.empty()) {
 136             return false;
 137         }
 138     }
 139     catch (const std::exception&) {
 140         return false;
 141     }
 142
 143     return true;
 144 }
 145
 146 bool DecodeHexBlk(CBlock& block, const std::string& strHexBlk)
 147 {
 148     if (!IsHex(strHexBlk))
 149         return false;
 150
 151     std::vector<unsigned char> blockData(ParseHex(strHexBlk));
 152     CDataStream ssBlock(blockData, SER_NETWORK, PROTOCOL_VERSION);
 153     try {
 154         ssBlock >> block;
 155     }
 156     catch (const std::exception&) {
 157         return false;
 158     }
 159
 160     return true;
 161 }
 162
 163 uint256 ParseHashUV(const UniValue& v, const std::string& strName)
 164 {
 165     std::string strHex;
 166     if (v.isStr())
 167         strHex = v.getValStr();
 168     return ParseHashStr(strHex, strName);  // Note: ParseHashStr("") throws a runtime_error
 169 }
 170
 171 uint256 ParseHashStr(const std::string& strHex, const std::string& strName)
 172 {
 173     if (!IsHex(strHex)) // Note: IsHex("") is false
 174         throw std::runtime_error(strName + " must be hexadecimal string (not '" + strHex + "')");
 175
 176     uint256 result;
 177     result.SetHex(strHex);
 178     return result;
 179 }
 180
 181 std::vector<unsigned char> ParseHexUV(const UniValue& v, const std::string& strName)
 182 {
 183     std::string strHex;
 184     if (v.isStr())
 185         strHex = v.getValStr();
 186     if (!IsHex(strHex))
 187         throw std::runtime_error(strName + " must be hexadecimal string (not '" + strHex + "')");
 188     return ParseHex(strHex);
 189 }