Add a TCP client example.
parent
d20c98f870
commit
f49723bbf9
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@ -34,3 +34,6 @@ name = "tcpdump"
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[[example]]
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name = "server"
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[[example]]
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name = "client"
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@ -0,0 +1,86 @@
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#[macro_use]
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extern crate log;
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extern crate env_logger;
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extern crate getopts;
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extern crate smoltcp;
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mod utils;
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use std::str::{self, FromStr};
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use std::time::Instant;
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use smoltcp::wire::{EthernetAddress, IpAddress};
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use smoltcp::iface::{ArpCache, SliceArpCache, EthernetInterface};
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use smoltcp::socket::{AsSocket, SocketSet};
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use smoltcp::socket::{TcpSocket, TcpSocketBuffer};
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fn main() {
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utils::setup_logging();
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let (device, args) = utils::setup_device(&["ADDRESS", "PORT"]);
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let address = IpAddress::from_str(&args[0]).expect("invalid address format");
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let port = u16::from_str(&args[1]).expect("invalid port format");
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let startup_time = Instant::now();
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let arp_cache = SliceArpCache::new(vec![Default::default(); 8]);
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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 hardware_addr = EthernetAddress([0x02, 0x00, 0x00, 0x00, 0x00, 0x01]);
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let protocol_addr = IpAddress::v4(192, 168, 69, 1);
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let mut iface = EthernetInterface::new(
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Box::new(device), Box::new(arp_cache) as Box<ArpCache>,
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hardware_addr, [protocol_addr]);
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let mut sockets = SocketSet::new(vec![]);
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let tcp_handle = sockets.add(tcp_socket);
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{
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let socket: &mut TcpSocket = sockets.get_mut(tcp_handle).as_socket();
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socket.connect((address, port), (protocol_addr, 49500)).unwrap();
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}
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let mut tcp_active = false;
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loop {
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{
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let socket: &mut TcpSocket = sockets.get_mut(tcp_handle).as_socket();
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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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}
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tcp_active = socket.is_active();
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if socket.may_recv() {
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let data = {
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let mut data = socket.recv(128).unwrap().to_owned();
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if data.len() > 0 {
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debug!("recv data: {:?}",
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str::from_utf8(data.as_ref()).unwrap_or("(invalid utf8)"));
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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
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};
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if socket.can_send() && data.len() > 0 {
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debug!("send data: {:?}",
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str::from_utf8(data.as_ref()).unwrap_or("(invalid utf8)"));
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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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}
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let timestamp = Instant::now().duration_since(startup_time);
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let timestamp_ms = (timestamp.as_secs() * 1000) +
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(timestamp.subsec_nanos() / 1000000) as u64;
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match iface.poll(&mut sockets, timestamp_ms) {
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Ok(()) => (),
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Err(e) => debug!("poll error: {}", e)
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}
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}
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}
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@ -16,7 +16,7 @@ use smoltcp::socket::{TcpSocket, TcpSocketBuffer};
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fn main() {
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utils::setup_logging();
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let device = utils::setup_device();
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let (device, _args) = utils::setup_device(&[]);
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let startup_time = Instant::now();
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@ -30,17 +30,21 @@ pub fn setup_logging() {
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.unwrap();
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}
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pub fn setup_device() -> Tracer<FaultInjector<TapInterface>, EthernetFrame<&'static [u8]>> {
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pub fn setup_device(more_args: &[&str])
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-> (Tracer<FaultInjector<TapInterface>, EthernetFrame<&'static [u8]>>,
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Vec<String>) {
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let mut opts = getopts::Options::new();
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opts.optopt("", "drop-chance", "Chance of dropping a packet (%)", "CHANCE");
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opts.optopt("", "corrupt-chance", "Chance of corrupting a packet (%)", "CHANCE");
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opts.optflag("h", "help", "print this help menu");
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let matches = opts.parse(env::args().skip(1)).unwrap();
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if matches.opt_present("h") || matches.free.len() != 1 {
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let brief = format!("Usage: {} INTERFACE [options]", env::args().nth(0).unwrap());
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if matches.opt_present("h") || matches.free.len() != more_args.len() + 1 {
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let brief = format!("Usage: {} INTERFACE {} [options]",
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env::args().nth(0).unwrap(),
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more_args.join(" "));
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print!("{}", opts.usage(&brief));
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process::exit(if matches.free.len() != 1 { 1 } else { 0 });
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process::exit(if matches.free.len() != more_args.len() + 1 { 1 } else { 0 });
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}
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let drop_chance = u8::from_str(&matches.opt_str("drop-chance")
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.unwrap_or("0".to_string())).unwrap();
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@ -59,5 +63,5 @@ pub fn setup_device() -> Tracer<FaultInjector<TapInterface>, EthernetFrame<&'sta
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device.set_corrupt_chance(corrupt_chance);
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let device = Tracer::<_, EthernetFrame<&'static [u8]>>::new(device, trace_writer);
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device
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(device, matches.free[1..].to_owned())
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}
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