Hey all, I was playing a bit with the Ethernaut CTF, and I think I understand something wrong with the delegatecall. (level 6). I solved it by sending the TX, but wanted to do it from a contract. As I want that the end call goes with msg.sender with my address, I used delegatecall like this:

(bool success, bytes memory result) = delegationAddress.delegatecall(abi.encodeWithSignature("pwn()"));

delegationAddress is a contract with a function like this:

fallback() external {
(bool result,) = address(delegate).delegatecall(msg.data);
if (result) {
this;
}

and delegate has a function like this:

function pwn() public {
owner = msg.sender;
}

If I am not wrong, if I call a function in my contract with that line, it should send the pwn() encoded call in the data (0xdd365b8b) to delegationAddress, which with the fallback function will delegate the call to pwn, which will receive my address and change the owner, but that does not work.

However, if I use call in my contract instead of delegatecall, the address of the contract is set as the owner as expected, so what I am doing wrong?