mirror of
https://github.com/smoltcp-rs/smoltcp.git
synced 2025-11-03 23:02:49 +00:00
107 lines
3.7 KiB
Rust
107 lines
3.7 KiB
Rust
#![allow(clippy::option_map_unit_fn)]
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mod utils;
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use log::*;
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use std::collections::BTreeMap;
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use std::os::unix::io::AsRawFd;
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use smoltcp::iface::{Interface, InterfaceBuilder, NeighborCache, Routes, SocketSet};
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use smoltcp::socket::dhcpv4;
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use smoltcp::time::Instant;
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use smoltcp::wire::{EthernetAddress, IpCidr, Ipv4Address, Ipv4Cidr};
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use smoltcp::{
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phy::{wait as phy_wait, Device, Medium},
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time::Duration,
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};
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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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.hardware_addr(ethernet_addr.into())
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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 dhcp_socket = dhcpv4::Socket::new();
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// Set a ridiculously short max lease time to show DHCP renews work properly.
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// This will cause the DHCP client to start renewing after 5 seconds, and give up the
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// lease after 10 seconds if renew hasn't succeeded.
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// IMPORTANT: This should be removed in production.
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dhcp_socket.set_max_lease_duration(Some(Duration::from_secs(10)));
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let mut sockets = SocketSet::new(vec![]);
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let dhcp_handle = sockets.add(dhcp_socket);
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loop {
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let timestamp = Instant::now();
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if let Err(e) = iface.poll(timestamp, &mut sockets) {
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debug!("poll error: {}", e);
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}
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let event = sockets.get::<dhcpv4::Socket>(dhcp_handle).poll();
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match event {
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None => {}
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Some(dhcpv4::Event::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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Some(dhcpv4::Event::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(timestamp, &sockets)).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
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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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