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72 lines
2.0 KiB
72 lines
2.0 KiB
pragma solidity ^0.4.11;
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import './payment/PullPayment.sol';
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import './lifecycle/Destructible.sol';
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/**
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* @title Bounty
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* @dev This bounty will pay out to a researcher if they break invariant logic of the contract.
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*/
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contract Bounty is PullPayment, Destructible {
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bool public claimed;
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mapping(address => address) public researchers;
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event TargetCreated(address createdAddress);
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/**
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* @dev Fallback function allowing the contract to recieve funds, if they haven't already been claimed.
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*/
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function() payable {
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require(!claimed);
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}
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/**
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* @dev Create and deploy the target contract (extension of Target contract), and sets the
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* msg.sender as a researcher
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* @return A target contract
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*/
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function createTarget() public returns(Target) {
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Target target = Target(deployContract());
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researchers[target] = msg.sender;
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TargetCreated(target);
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return target;
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}
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/**
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* @dev Internal function to deploy the target contract.
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* @return A target contract address
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*/
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function deployContract() internal returns(address);
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/**
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* @dev Sends the contract funds to the researcher that proved the contract is broken.
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* @param target contract
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*/
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function claim(Target target) public {
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address researcher = researchers[target];
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require(researcher != 0);
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// Check Target contract invariants
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require(!target.checkInvariant());
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asyncSend(researcher, this.balance);
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claimed = true;
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}
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}
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/**
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* @title Target
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* @dev Your main contract should inherit from this class and implement the checkInvariant method.
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*/
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contract Target {
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/**
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* @dev Checks all values a contract assumes to be true all the time. If this function returns
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* false, the contract is broken in some way and is in an inconsistent state.
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* In order to win the bounty, security researchers will try to cause this broken state.
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* @return True if all invariant values are correct, false otherwise.
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*/
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function checkInvariant() public returns(bool);
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}
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