95 lines
3.3 KiB
Rust
95 lines
3.3 KiB
Rust
#![allow(clippy::option_map_unit_fn)]
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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::*;
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use smoltcp::phy::{Device, Medium, wait as phy_wait};
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use smoltcp::wire::{EthernetAddress, Ipv4Address, IpCidr, Ipv4Cidr};
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use smoltcp::iface::{NeighborCache, InterfaceBuilder, Interface, Routes};
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use smoltcp::socket::{SocketSet, Dhcpv4Socket, Dhcpv4Event};
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use smoltcp::time::Instant;
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fn main() {
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#[cfg(feature = "log")]
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utils::setup_logging("");
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let (mut opts, mut free) = utils::create_options();
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utils::add_tuntap_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_tuntap_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, device, /*loopback=*/false);
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let neighbor_cache = NeighborCache::new(BTreeMap::new());
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let ethernet_addr = EthernetAddress([0x02, 0x00, 0x00, 0x00, 0x00, 0x01]);
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let ip_addrs = [IpCidr::new(Ipv4Address::UNSPECIFIED.into(), 0)];
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let mut routes_storage = [None; 1];
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let routes = Routes::new(&mut routes_storage[..]);
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let medium = device.capabilities().medium;
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let mut builder = InterfaceBuilder::new(device)
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.ip_addrs(ip_addrs)
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.routes(routes);
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if medium == Medium::Ethernet {
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builder = builder
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.ethernet_addr(ethernet_addr)
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.neighbor_cache(neighbor_cache);
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}
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let mut iface = builder.finalize();
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let mut sockets = SocketSet::new(vec![]);
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let dhcp_handle = sockets.add(Dhcpv4Socket::new());
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loop {
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let timestamp = Instant::now();
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if let Err(e) = iface.poll(&mut sockets, timestamp) {
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debug!("poll error: {}", e);
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}
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match sockets.get::<Dhcpv4Socket>(dhcp_handle).poll() {
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Dhcpv4Event::NoChange => {}
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Dhcpv4Event::Configured(config) => {
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debug!("DHCP config acquired!");
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debug!("IP address: {}", config.address);
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set_ipv4_addr(&mut iface, config.address);
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if let Some(router) = config.router {
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debug!("Default gateway: {}", router);
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iface.routes_mut().add_default_ipv4_route(router).unwrap();
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} else {
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debug!("Default gateway: None");
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iface.routes_mut().remove_default_ipv4_route();
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}
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for (i, s) in config.dns_servers.iter().enumerate() {
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if let Some(s) = s {
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debug!("DNS server {}: {}", i, s);
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}
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}
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}
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Dhcpv4Event::Deconfigured => {
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debug!("DHCP lost config!");
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set_ipv4_addr(&mut iface, Ipv4Cidr::new(Ipv4Address::UNSPECIFIED, 0));
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iface.routes_mut().remove_default_ipv4_route();
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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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fn set_ipv4_addr<DeviceT>(iface: &mut Interface<'_, DeviceT>, cidr: Ipv4Cidr)
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where DeviceT: for<'d> Device<'d>
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{
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iface.update_ip_addrs(|addrs| {
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let dest = addrs.iter_mut().next().unwrap();
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*dest = IpCidr::Ipv4(cidr);
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});
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}
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