evm-opcode-finder

README

Abilities

1. Search for opcode in contracts in the latest block

  func FindOpcode(client *ethclient.Client, opcode vm.OpCode) {
	  block := latestBlock(client)
	  inspectContractsInBlock(client, block, opcode)
  }

1. Search for opcode in certain contract

  func FindOpcodeInContract(client *ethclient.Client, address common.Address, opcode vm.OpCode) {
    _, bytecode := isContract(client, address)

    if compareOpcodes(bytecode, opcode) {
      success(opcode, address)
    }
  }

Note: it doesn't search for PUSH opcodes, since they're exist in bytecode of all contracts and it skips all PUSH instructions with their arguments

Example

  const opcode = "SELFDESTRUCT"

  func main() {
    client, err := ethclient.Dial(URL)

    if err != nil {
      log.Fatal(err)
    }

    finder.FindOpcode(client, vm.StringToOp(opcode))
  }

Search for SELFDESTRUCT opcode in contracts in the latest block

OUTPUT

  ========================
  Looking for SELFDESTRUCT in contracts
   in block 15888893
  ========================
  Catch opcode: SELFDESTRUCT
   in contract: 0x46A82Ec528d89154EF3Dc66d9E03fEd617886d2c
  Catch opcode: SELFDESTRUCT
   in contract: 0x1111111254fb6c44bAC0beD2854e76F90643097d
  Catch opcode: SELFDESTRUCT
   in contract: 0xe069aE4B336Ca73142cDc5206ed4a4d3A3ff39f6

Inspecting contracts in etherscan:

1. https://etherscan.io/address/0x46A82Ec528d89154EF3Dc66d9E03fEd617886d2c#code 👍 it has SELFDESTRUCT
2. https://etherscan.io/address/0x1111111254fb6c44bAC0beD2854e76F90643097d#code 👍 it has SELFDESTRUCT
3. https://etherscan.io/address/0xe069aE4B336Ca73142cDc5206ed4a4d3A3ff39f6#code 👍 it has SELFDESTRUCT (close to the end it has ff opcode which is SELFDESTRUCT)

Limitations

1. At the moment it can return the same addresses in the block, i.e. it doesn't check for collisions
2. It inspects only one latest block, stopping then execution