54 lines
1.0 KiB
Solidity
54 lines
1.0 KiB
Solidity
/*
|
|
* @source: http://blockchain.unica.it/projects/ethereum-survey/attacks.html#oddsandevens
|
|
* @author: -
|
|
* @vulnerable_at_lines: 25,28
|
|
*/
|
|
|
|
pragma solidity ^0.4.2;
|
|
|
|
contract OddsAndEvens{
|
|
|
|
struct Player {
|
|
address addr;
|
|
uint number;
|
|
}
|
|
|
|
Player[2] public players; //public only for debug purpose
|
|
|
|
uint8 tot;
|
|
address owner;
|
|
|
|
function OddsAndEvens() {
|
|
owner = msg.sender;
|
|
}
|
|
// <yes> <report> FRONT_RUNNING
|
|
function play(uint number) payable{
|
|
if (msg.value != 1 ether) throw;
|
|
// <yes> <report> FRONT_RUNNING
|
|
players[tot] = Player(msg.sender, number);
|
|
tot++;
|
|
|
|
if (tot==2) andTheWinnerIs();
|
|
}
|
|
|
|
function andTheWinnerIs() private {
|
|
bool res ;
|
|
uint n = players[0].number+players[1].number;
|
|
if (n%2==0) {
|
|
res = players[0].addr.send(1800 finney);
|
|
}
|
|
else {
|
|
res = players[1].addr.send(1800 finney);
|
|
}
|
|
|
|
delete players;
|
|
tot=0;
|
|
}
|
|
|
|
function getProfit() {
|
|
if(msg.sender!=owner) throw;
|
|
bool res = msg.sender.send(this.balance);
|
|
}
|
|
|
|
}
|