109 lines
4.2 KiB
Rust
109 lines
4.2 KiB
Rust
mod utils;
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use std::collections::BTreeMap;
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use std::os::unix::io::AsRawFd;
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use log::debug;
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use smoltcp::phy::wait as phy_wait;
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use smoltcp::wire::{EthernetAddress, IpVersion, IpProtocol, IpAddress, IpCidr, Ipv4Address,
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Ipv4Packet, IgmpPacket, IgmpRepr};
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use smoltcp::iface::{NeighborCache, EthernetInterfaceBuilder};
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use smoltcp::socket::{SocketSet,
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RawSocket, RawSocketBuffer, RawPacketMetadata,
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UdpSocket, UdpSocketBuffer, UdpPacketMetadata};
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use smoltcp::time::Instant;
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const MDNS_PORT: u16 = 5353;
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const MDNS_GROUP: [u8; 4] = [224, 0, 0, 251];
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fn main() {
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utils::setup_logging("warn");
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let (mut opts, mut free) = utils::create_options();
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utils::add_tap_options(&mut opts, &mut free);
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utils::add_middleware_options(&mut opts, &mut free);
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let mut matches = utils::parse_options(&opts, free);
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let device = utils::parse_tap_options(&mut matches);
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let fd = device.as_raw_fd();
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let device = utils::parse_middleware_options(&mut matches,
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device,
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/*loopback=*/
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false);
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let neighbor_cache = NeighborCache::new(BTreeMap::new());
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let local_addr = Ipv4Address::new(192, 168, 69, 2);
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let ethernet_addr = EthernetAddress([0x02, 0x00, 0x00, 0x00, 0x00, 0x02]);
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let ip_addr = IpCidr::new(IpAddress::from(local_addr), 24);
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let mut ipv4_multicast_storage = [None; 1];
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let mut iface = EthernetInterfaceBuilder::new(device)
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.ethernet_addr(ethernet_addr)
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.neighbor_cache(neighbor_cache)
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.ip_addrs([ip_addr])
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.ipv4_multicast_groups(&mut ipv4_multicast_storage[..])
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.finalize();
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let now = Instant::now();
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// Join a multicast group to receive mDNS traffic
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iface.join_multicast_group(Ipv4Address::from_bytes(&MDNS_GROUP), now).unwrap();
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let mut sockets = SocketSet::new(vec![]);
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// Must fit at least one IGMP packet
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let raw_rx_buffer = RawSocketBuffer::new(vec![RawPacketMetadata::EMPTY; 2], vec![0; 512]);
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// Will not send IGMP
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let raw_tx_buffer = RawSocketBuffer::new(vec![], vec![]);
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let raw_socket = RawSocket::new(
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IpVersion::Ipv4, IpProtocol::Igmp,
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raw_rx_buffer, raw_tx_buffer
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);
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let raw_handle = sockets.add(raw_socket);
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// Must fit mDNS payload of at least one packet
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let udp_rx_buffer = UdpSocketBuffer::new(vec![UdpPacketMetadata::EMPTY; 4], vec![0; 1024]);
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// Will not send mDNS
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let udp_tx_buffer = UdpSocketBuffer::new(vec![UdpPacketMetadata::EMPTY], vec![0; 0]);
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let udp_socket = UdpSocket::new(udp_rx_buffer, udp_tx_buffer);
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let udp_handle = sockets.add(udp_socket);
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loop {
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let timestamp = Instant::now();
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match iface.poll(&mut sockets, timestamp) {
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Ok(_) => {},
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Err(e) => {
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debug!("poll error: {}",e);
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}
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}
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{
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let mut socket = sockets.get::<RawSocket>(raw_handle);
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if socket.can_recv() {
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// For display purposes only - normally we wouldn't process incoming IGMP packets
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// in the application layer
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socket.recv()
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.and_then(|payload| Ipv4Packet::new_checked(payload))
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.and_then(|ipv4_packet| IgmpPacket::new_checked(ipv4_packet.payload()))
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.and_then(|igmp_packet| IgmpRepr::parse(&igmp_packet))
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.map(|igmp_repr| println!("IGMP packet: {:?}", igmp_repr))
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.unwrap_or_else(|e| println!("Recv IGMP error: {:?}", e));
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}
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}
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{
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let mut socket = sockets.get::<UdpSocket>(udp_handle);
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if !socket.is_open() {
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socket.bind(MDNS_PORT).unwrap()
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}
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if socket.can_recv() {
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socket.recv()
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.map(|(data, sender)| println!("mDNS traffic: {} UDP bytes from {}", data.len(), sender))
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.unwrap_or_else(|e| println!("Recv UDP error: {:?}", e));
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}
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}
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phy_wait(fd, iface.poll_delay(&sockets, timestamp)).expect("wait error");
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}
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}
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