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Level 6. Delegation(The Ethernaut)

Last updated at Posted at 2018-04-25

「The Ethernaut by Zeppelin Level 6. Delegation」を翻訳してみました(CryptoZombiesのように?)

原文はこちら

https://ethernaut.zeppelin.solutions
6. Delegationをクリック

6. Delegation

下記コードのインスタンス(コントラクト)のオーナーを自分自身のアドレスに変更することがこのレベルのクリア

回答の助けになるヒント
  • デリゲートコールにおける低レベル関数がどのように動作するか、デリゲートする為にはどのように使用するか、Solidityのドキュメントを参照せよ。
  • フォールバックメソッドについての理解
  • メソッドid(s)についての理解

ソースコード

pragma solidity ^0.4.18;

contract Delegate {

  address public owner;

  function Delegate(address _owner) public {
    owner = _owner;
  }

  function pwn() public {
    owner = msg.sender;
  }
}

contract Delegation {

  address public owner;
  Delegate delegate;

  function Delegation(address _delegateAddress) public {
    delegate = Delegate(_delegateAddress);
    owner = msg.sender;
  }

  function() public {
    if(delegate.delegatecall(msg.data)) {
      this;
    }
  }
}
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