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std::net::SocketAddrV6; +use tokio::net::UdpSocket; + +const scope_id: u32 = 15; +const duid: [u8; 4] = [0x13, 0x37, 0x23, 0x42]; + +const All_DHCP_Relay_Agents_and_Servers: &str = "ff02::1:2"; +const DHCP_Client_port: u16 = 546; +const DHCP_Relay_Agent_and_Server_port: u16 = 547; + +#[tokio::main] +async fn main() { + let socket_addr = SocketAddrV6::new("::".parse().unwrap(), DHCP_Client_port, 0, scope_id); + let sock = UdpSocket::bind(socket_addr).await.unwrap(); + + let remote_addr = SocketAddrV6::new(All_DHCP_Relay_Agents_and_Servers.parse().unwrap(), DHCP_Relay_Agent_and_Server_port, 0, scope_id); + + let mut msg = Message::new(MessageType::InformationRequest); + let mut msg_opts = msg.opts_mut(); + //msg_opts.insert(DhcpOption::ClientId(Vec::from(duid))); + msg_opts.insert(DhcpOption::ElapsedTime(0)); + msg_opts.insert(DhcpOption::ORO(ORO { opts: vec![ + OptionCode::InfMaxRt, + OptionCode::InformationRefreshTime, + OptionCode::DomainNameServers, + OptionCode::DomainSearchList, + ],})); // request options + + let mut msg_buf = Vec::new(); + let mut msg_encoder = Encoder::new(&mut msg_buf); + msg.encode(&mut msg_encoder).unwrap(); // Serializes msg to msg_buf + + sock.send_to(&msg_buf, remote_addr).await.unwrap(); + + let mut buf = [0; 1024]; + let (len, recv_addr) = sock.recv_from(&mut buf).await.unwrap(); + println!("{:?} bytes received from {:?}", len, recv_addr); + println!("{}", &buf[..len].escape_ascii().to_string()); +}