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use std::{io::Error, net::Ipv4Addr, u16}; use num_derive::FromPrimitive; use num_traits::FromPrimitive; use pnet::{ datalink::{channel, Channel}, packet::{ arp::{ArpHardwareTypes, ArpOperation, ArpPacket, MutableArpPacket}, ethernet::{ EtherType, EtherTypes::{self}, MutableEthernetPacket, }, MutablePacket, Packet, }, util::MacAddr, }; use crate::interfaces::Interface; pub struct ArpMessage { pub source_hardware_address: MacAddr, pub source_protocol_address: Ipv4Addr, pub target_hardware_address: MacAddr, pub target_protocol_address: Ipv4Addr, pub ethertype: EtherType, pub operation: Operation, } #[derive(Copy, Clone, FromPrimitive)] pub enum Operation { ArpRequest = 0x1, ArpResponse = 0x2, RarpRequest = 0x3, RarpResponse = 0x4, } impl ArpMessage { fn new( ethertype: EtherType, source_hardware_address: MacAddr, source_protocol_address: Ipv4Addr, target_hardware_address: MacAddr, target_protocol_address: Ipv4Addr, operation: Operation, ) -> Self { ArpMessage { source_hardware_address: source_hardware_address, source_protocol_address: source_protocol_address, target_hardware_address: target_hardware_address, target_protocol_address: target_protocol_address, ethertype: ethertype, operation: operation, } } pub fn new_arp_request( source_hardware_address: MacAddr, source_protocol_address: Ipv4Addr, target_protocol_address: Ipv4Addr, ) -> Self { Self::new( EtherTypes::Arp, source_hardware_address, source_protocol_address, MacAddr(0, 0, 0, 0, 0, 0), target_protocol_address, Operation::ArpRequest, ) } pub fn new_arp_response( source_hardware_address: MacAddr, source_protocol_address: Ipv4Addr, target_hardware_address: MacAddr, target_protocol_address: Ipv4Addr, ) -> Self { Self::new( EtherTypes::Arp, source_hardware_address, source_protocol_address, target_hardware_address, target_protocol_address, Operation::ArpResponse, ) } pub fn new_rarp_request( source_hardware_address: MacAddr, target_hardware_address: MacAddr, ) -> Self { Self::new( EtherTypes::Rarp, source_hardware_address, Ipv4Addr::new(0, 0, 0, 0), target_hardware_address, Ipv4Addr::new(0, 0, 0, 0), Operation::RarpRequest, ) } pub fn new_rarp_response( source_hardware_address: MacAddr, source_protocol_address: Ipv4Addr, target_hardware_address: MacAddr, target_protocol_address: Ipv4Addr, ) -> Self { Self::new( EtherTypes::Rarp, source_hardware_address, source_protocol_address, target_hardware_address, target_protocol_address, Operation::RarpResponse, ) } pub fn send(&self, interface: &Interface) -> Result<(), Error> { let mut tx = match channel(&interface.get_raw_interface(), Default::default()) { Ok(Channel::Ethernet(tx, _)) => tx, Ok(_) => panic!("Unknown channel type"), Err(err) => panic!("Error when opening channel: {}", err), }; let mut eth_buf = vec![0; 42]; let mut eth_packet = MutableEthernetPacket::new(&mut eth_buf).unwrap(); eth_packet.set_destination(MacAddr::broadcast()); eth_packet.set_source(interface.get_mac().into()); eth_packet.set_ethertype(self.ethertype); let mut rarp_buf = vec![0; 28]; let mut rarp_packet = MutableArpPacket::new(&mut rarp_buf).unwrap(); rarp_packet.set_hardware_type(ArpHardwareTypes::Ethernet); rarp_packet.set_protocol_type(EtherTypes::Ipv4); rarp_packet.set_hw_addr_len(0x06); rarp_packet.set_proto_addr_len(0x04); rarp_packet.set_operation(ArpOperation::new(self.operation as u16)); rarp_packet.set_sender_hw_addr(self.source_hardware_address); rarp_packet.set_sender_proto_addr(self.source_protocol_address); rarp_packet.set_target_hw_addr(self.target_hardware_address); rarp_packet.set_target_proto_addr(self.target_protocol_address); eth_packet.set_payload(rarp_packet.packet_mut()); tx.send_to(eth_packet.packet(), None).unwrap() } } impl From<ArpPacket<'_>> for ArpMessage { fn from(arp_packet: ArpPacket) -> Self { let operation_raw = arp_packet.get_operation().0; let operation = match FromPrimitive::from_u16(operation_raw) { Some(op) => op, None => panic!("Could not cast operation raw value {} to enum.", operation_raw) }; ArpMessage::new( arp_packet.get_protocol_type(), arp_packet.get_sender_hw_addr(), arp_packet.get_sender_proto_addr(), arp_packet.get_target_hw_addr(), arp_packet.get_target_proto_addr(), operation ) } }