nathan-websculpt

function sendViaCall(address payable _to) public payable {
   (bool sent, bytes memory data) = _to.call{value:msg.value}("");
   require(sent, "Failed to send Ether");
}

nathan-websculpt

function withdrawFromAttackee() public {
    uint senderBalance = attackeeBalances[msg.sender];
    require(senderBalance > 0);

    (bool success, ) = msg.sender.call{ value: senderBalance }("");
    require(success, "withdrawFromAttackee failed to send");

    attackeeBalances[msg.sender] = 0;
}

nathan-websculpt

//this is called when Attackee sends Ether to this contract (Attacker)
fallback() external payable {
    if(address(contractToAttack).balance >= 1 ether) {
        contractToAttack.withdrawFromAttackee();
    }
}

function performAttack() external payable {
    require(msg.value >= 1 ether);
    contractToAttack.depositIntoAttackee{value: 1 ether}();

nathan-websculpt

// SPDX-License-Identifier: GPL-3.0

pragma solidity >=0.7.0 <0.9.0;

contract Attackee {
    mapping(address => uint) public attackeeBalances; 
    
    function depositIntoAttackee() external payable {
        attackeeBalances[msg.sender] += msg.value;
    }

nathan-websculpt

// SPDX-License-Identifier: GPL-3.0

pragma solidity >=0.7.0 <0.9.0;

contract Attackee {
    mapping(address => uint) public attackeeBalances; 
    
    function depositIntoAttackee() external payable {
        attackeeBalances[msg.sender] += msg.value;
    }

nathan-websculpt

// SPDX-License-Identifier: GPL-3.0

pragma solidity >=0.7.0 <0.9.0;


contract ReentrancyGuard {
    bool private guardLocked;

    modifier noReentry() {
        require(!guardLocked, "Prevented by noReentry in ReentrancyGuard");

nathan-websculpt

// SPDX-License-Identifier: GPL-3.0

pragma solidity >=0.7.0 <0.9.0;


contract ReentrancyGuard {
    bool private guardLocked;

    modifier noReentry() {
        require(!guardLocked, "Prevented by noReentry in ReentrancyGuard");

nathan-websculpt

// SPDX-License-Identifier: GPL-3.0

pragma solidity >=0.7.0 <0.9.0;
import "https://github.com/OpenZeppelin/openzeppelin-contracts/blob/release-v4.3/contracts/security/ReentrancyGuard.sol";

contract Attackee is ReentrancyGuard {
    
    mapping(address => uint) public attackeeBalances; 
    
    function depositIntoAttackee() external payable {

nathan-websculpt

// SPDX-License-Identifier: GPL-3.0

pragma solidity >=0.7.0 <0.9.0;

import "https://github.com/OpenZeppelin/openzeppelin-contracts/blob/release-v4.3/contracts/security/ReentrancyGuard.sol";
import "https://github.com/OpenZeppelin/openzeppelin-contracts/blob/release-v4.3/contracts/utils/escrow/Escrow.sol";

contract EscrowExample is ReentrancyGuard {
    Escrow private immutable _escrow;

nathan-websculpt

// SPDX-License-Identifier: GPL-3.0

pragma solidity >=0.7.0 <0.9.0;

contract StringTesting {
    
    function stringCompare(string calldata _inputOne, string calldata _inputTwo) external pure returns (bool r) {
        
        bool rslt;