You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: main.rs
    path of file: ./repos/mirrord/mirrord/layer/tests/apps/issue1776portnot53/src
    
    the code of the file until where you have to start completion: use std::{
    alloc::{self, Layout},
    mem::{self, size_of},
    net::{SocketAddr, UdpSocket},
    os::fd::AsRawFd,
};

use libc::{c_void, iovec};
use socket2::SockAddr;

unsafe fn address_from_raw(
    raw_address: *const libc::sockaddr,
    address_length: libc::socklen_t,
) -> Option<SocketAddr> {
    SockAddr::try_init(|storage, len| {
        storage.copy_from_nonoverlapping(raw_address.cast(), 1);
        len.copy_from_nonoverlapping(&address_length, 1);

        Ok(())
    })
    .ok()
    .and_then(|((), address)| address.as_socket())
}

fn main() {
    println!("test issue 1776 port not 53: START");

    let local_addr: SocketAddr = "127.0.0.1:0".parse().unwrap();
    let remote_addr: SocketAddr = "127.0.0.1:7778".parse().unwrap();

    let socket = UdpSocket::bind(local_addr).unwrap();
    let recv_socket = UdpSocket::bind(remote_addr).unwrap();

    let socket_fd = socket.as_raw_fd();
    let recv_socket_fd = recv_socket.as_raw_fd();

    let rawish_remote_addr = SockAddr::from(remote_addr);
    let remote_addr_ptr = rawish_remote_addr.as_ptr() as *mut c_void;
    let remote_addr_len = rawish_remote_addr.len();

    let recv_thread = std::thread::spawn(move || unsafe {
        let mut incoming_msg_hdr: libc::msghdr = mem::zeroed();
        let incoming_name =
            alloc::alloc_zeroed(Layout::array::<u8>(size_of::<libc::sockaddr>()).unwrap())
                as *mut _;
        let incoming_name_len = remote_addr_len;

        incoming_msg_hdr.msg_name = incoming_name;
        incoming_msg_hdr.msg_namelen = incoming_name_len;

        let recv_buffer = &mut vec![0u8; 4];
        let recv_buffer_ptr = recv_buffer.as_mut_ptr() as *mut c_void;
        let mut iov = iovec {
            iov_base: recv_buffer_ptr,
            iov_len: recv_buffer.len(),
        };

        incoming_msg_hdr.msg_iov = &mut iov
    
fn main() {
    println!("test issue 1776 port not 53: START");

    let local_addr: SocketAddr = "127.0.0.1:0".parse().unwrap();
    let remote_addr: SocketAddr = "127.0.0.1:7778".parse().unwrap();

    let socket = UdpSocket::bind(local_addr).unwrap();
    let recv_socket = UdpSocket::bind(remote_addr).unwrap();

    let socket_fd = socket.as_raw_fd();
    let recv_socket_fd = recv_socket.as_raw_fd();

    let rawish_remote_addr = SockAddr::from(remote_addr);
    let remote_addr_ptr = rawish_remote_addr.as_ptr() as *mut c_void;
    let remote_addr_len = rawish_remote_addr.len();

    let recv_thread = std::thread::spawn(move || unsafe {
        let mut incoming_msg_hdr: libc::msghdr = mem::zeroed();
        let incoming_name =
            alloc::alloc_zeroed(Layout::array::<u8>(size_of::<libc::sockaddr>()).unwrap())
                as *mut _;
        let incoming_name_len = remote_addr_len;

        incoming_msg_hdr.msg_name = incoming_name;
        incoming_msg_hdr.msg_namelen = incoming_name_len;

        let recv_buffer = &mut vec![0u8; 4];
        let recv_buffer_ptr = recv_buffer.as_mut_ptr() as *mut c_void;
        let mut iov = iovec {
            iov_base: recv_buffer_ptr,
            iov_len: recv_buffer.len(),
        };

        incoming_msg_hdr.msg_iov = &mut iov;
        incoming_msg_hdr.msg_iovlen = 1;

        let amount = libc::recvmsg(recv_socket_fd, &mut incoming_msg_hdr, 0);

        let raw_incoming_addr = incoming_msg_hdr.msg_name as *const libc::sockaddr;
        let raw_incoming_addr_len = incoming_msg_hdr.msg_namelen;
        let incoming_addr = address_from_raw(raw_incoming_addr, raw_incoming_addr_len).unwrap();
        assert_eq!(amount, 4);
        assert_ne!(incoming_addr, remote_addr);
        assert_ne!(incoming_addr, local_addr);
    });

    // mirrord should intercept this
    unsafe {
        let mut outgoing_msg_hdr: libc::msghdr = mem::zeroed();

        outgoing_msg_hdr.msg_name = remote_addr_ptr;
        outgoing_msg_hdr.msg_namelen = remote_addr_len;

        let bytes = &mut [0u8, 1, 2, 3];
        let bytes_ptr = bytes.as_mut_ptr() as *mut c_void;
        let mut iov = iovec {
            iov_base: bytes_ptr,
            iov_len: 4,
        };

        outgoing_msg_hdr.msg_iov = &mut iov;
        outgoing_msg_hdr.msg_iovlen = 1;

        let amount = libc::sendmsg(socket_fd, &outgoing_msg_hdr, 0);
        assert_eq!(amount, 4);
    }

    recv_thread.join().unwrap();

    println!("test issue 1776 port not 53: SUCCESS");
}