110 lines
3.8 KiB
Rust
110 lines
3.8 KiB
Rust
mod utils;
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use log::debug;
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use std::collections::BTreeMap;
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use std::os::unix::io::AsRawFd;
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use std::str::{self, FromStr};
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use smoltcp::iface::{InterfaceBuilder, NeighborCache, Routes};
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use smoltcp::phy::{wait as phy_wait, Device, Medium};
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use smoltcp::socket::{TcpSocket, TcpSocketBuffer};
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use smoltcp::time::Instant;
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use smoltcp::wire::{EthernetAddress, IpAddress, IpCidr, Ipv4Address};
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fn main() {
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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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free.push("ADDRESS");
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free.push("PORT");
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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 address = IpAddress::from_str(&matches.free[0]).expect("invalid address format");
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let port = u16::from_str(&matches.free[1]).expect("invalid port format");
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let neighbor_cache = NeighborCache::new(BTreeMap::new());
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let tcp_rx_buffer = TcpSocketBuffer::new(vec![0; 64]);
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let tcp_tx_buffer = TcpSocketBuffer::new(vec![0; 128]);
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let tcp_socket = TcpSocket::new(tcp_rx_buffer, tcp_tx_buffer);
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let ethernet_addr = EthernetAddress([0x02, 0x00, 0x00, 0x00, 0x00, 0x02]);
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let ip_addrs = [IpCidr::new(IpAddress::v4(192, 168, 69, 2), 24)];
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let default_v4_gw = Ipv4Address::new(192, 168, 69, 100);
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let mut routes_storage = [None; 1];
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let mut routes = Routes::new(&mut routes_storage[..]);
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routes.add_default_ipv4_route(default_v4_gw).unwrap();
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let medium = device.capabilities().medium;
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let mut builder = InterfaceBuilder::new(device, vec![])
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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 tcp_handle = iface.add_socket(tcp_socket);
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let socket = iface.get_socket::<TcpSocket>(tcp_handle);
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socket.connect((address, port), 49500).unwrap();
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let mut tcp_active = false;
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loop {
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let timestamp = Instant::now();
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match iface.poll(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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let socket = iface.get_socket::<TcpSocket>(tcp_handle);
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if socket.is_active() && !tcp_active {
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debug!("connected");
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} else if !socket.is_active() && tcp_active {
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debug!("disconnected");
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break;
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}
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tcp_active = socket.is_active();
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if socket.may_recv() {
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let data = socket
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.recv(|data| {
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let mut data = data.to_owned();
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if !data.is_empty() {
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debug!(
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"recv data: {:?}",
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str::from_utf8(data.as_ref()).unwrap_or("(invalid utf8)")
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);
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data = data.split(|&b| b == b'\n').collect::<Vec<_>>().concat();
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data.reverse();
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data.extend(b"\n");
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}
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(data.len(), data)
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})
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.unwrap();
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if socket.can_send() && !data.is_empty() {
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debug!(
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"send data: {:?}",
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str::from_utf8(data.as_ref()).unwrap_or("(invalid utf8)")
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);
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socket.send_slice(&data[..]).unwrap();
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}
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} else if socket.may_send() {
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debug!("close");
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socket.close();
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}
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phy_wait(fd, iface.poll_delay(timestamp)).expect("wait error");
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}
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}
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