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