tx_sanity_check.cpp

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// Copyright (c) 2019, The Monero Project
// 
// All rights reserved.
// 
// Redistribution and use in source and binary forms, with or without modification, are
// permitted provided that the following conditions are met:
// 
// 1. Redistributions of source code must retain the above copyright notice, this list of
//    conditions and the following disclaimer.
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// 2. Redistributions in binary form must reproduce the above copyright notice, this list
//    of conditions and the following disclaimer in the documentation and/or other
//    materials provided with the distribution.
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// 3. Neither the name of the copyright holder nor the names of its contributors may be
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//    prior written permission.
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY
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#include <stdint.h>
#include <vector>
#include "cryptonote_basic/cryptonote_basic_impl.h"
#include "cryptonote_basic/cryptonote_format_utils.h"
#include "blockchain.h"
#include "tx_sanity_check.h"
 
#undef ELECTRONEUM_DEFAULT_LOG_CATEGORY
#define ELECTRONEUM_DEFAULT_LOG_CATEGORY "verify"
 
namespace cryptonote
{
 
bool tx_sanity_check(Blockchain &blockchain, const cryptonote::blobdata &tx_blob)
{
  cryptonote::transaction tx;
 
  if (!cryptonote::parse_and_validate_tx_from_blob(tx_blob, tx))
  {
    MERROR("Failed to parse transaction");
    return false;
  }
 
  if (cryptonote::is_coinbase(tx))
  {
    MERROR("Transaction is coinbase");
    return false;
  }
  std::set<uint64_t> rct_indices;
  size_t n_indices = 0;
 
  for (const auto &txin : tx.vin)
  {
    if (txin.type() != typeid(cryptonote::txin_to_key))
      continue;
    const cryptonote::txin_to_key &in_to_key = boost::get<cryptonote::txin_to_key>(txin);
    if (in_to_key.amount != 0)
      continue;
    const std::vector<uint64_t> absolute = cryptonote::relative_output_offsets_to_absolute(in_to_key.key_offsets);
    for (uint64_t offset: absolute)
      rct_indices.insert(offset);
    n_indices += in_to_key.key_offsets.size();
  }
 
  if (tx.version < 3 && n_indices <= 10)
  {
    MERROR("n_indices is only " << n_indices);
    return true;
  }
 
  return true;
}
 
}