178 lines
5.4 KiB
Rust
178 lines
5.4 KiB
Rust
#![cfg_attr(not(feature = "std"), no_std)]
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#![allow(unused_mut)]
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#[cfg(feature = "std")]
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use std as core;
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#[macro_use]
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extern crate log;
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extern crate smoltcp;
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#[cfg(feature = "std")]
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extern crate env_logger;
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#[cfg(feature = "std")]
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extern crate getopts;
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#[cfg(feature = "std")]
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#[allow(dead_code)]
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mod utils;
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use core::str;
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use smoltcp::phy::Loopback;
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use smoltcp::wire::{EthernetAddress, IpAddress, IpCidr};
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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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#[cfg(not(feature = "std"))]
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mod mock {
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use core::cell::Cell;
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#[derive(Debug)]
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pub struct Clock(Cell<u64>);
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impl Clock {
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pub fn new() -> Clock {
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Clock(Cell::new(0))
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}
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pub fn advance(&self, millis: u64) {
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self.0.set(self.0.get() + millis)
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}
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pub fn elapsed(&self) -> u64 {
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self.0.get()
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}
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}
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}
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#[cfg(feature = "std")]
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mod mock {
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use std::sync::Arc;
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use std::sync::atomic::{Ordering, AtomicUsize};
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// should be AtomicU64 but that's unstable
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#[derive(Debug, Clone)]
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pub struct Clock(Arc<AtomicUsize>);
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impl Clock {
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pub fn new() -> Clock {
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Clock(Arc::new(AtomicUsize::new(0)))
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}
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pub fn advance(&self, millis: u64) {
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self.0.fetch_add(millis as usize, Ordering::SeqCst);
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}
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pub fn elapsed(&self) -> u64 {
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self.0.load(Ordering::SeqCst) as u64
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}
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}
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}
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fn main() {
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let clock = mock::Clock::new();
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let mut device = Loopback::new();
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#[cfg(feature = "std")]
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let mut device = {
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let clock = clock.clone();
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utils::setup_logging_with_clock("", move || clock.elapsed());
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let (mut opts, mut free) = utils::create_options();
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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_middleware_options(&mut matches, device, /*loopback=*/true);
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device
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};
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let mut arp_cache_entries: [_; 8] = Default::default();
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let mut arp_cache = SliceArpCache::new(&mut arp_cache_entries[..]);
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let mut ip_addrs = [IpCidr::new(IpAddress::v4(127, 0, 0, 1), 8)];
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let mut iface = EthernetInterface::new(
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&mut device, &mut arp_cache as &mut ArpCache,
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EthernetAddress::default(), &mut ip_addrs[..], None);
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let server_socket = {
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// It is not strictly necessary to use a `static mut` and unsafe code here, but
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// on embedded systems that smoltcp targets it is far better to allocate the data
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// statically to verify that it fits into RAM rather than get undefined behavior
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// when stack overflows.
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static mut TCP_SERVER_RX_DATA: [u8; 1024] = [0; 1024];
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static mut TCP_SERVER_TX_DATA: [u8; 1024] = [0; 1024];
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let tcp_rx_buffer = TcpSocketBuffer::new(unsafe { &mut TCP_SERVER_RX_DATA[..] });
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let tcp_tx_buffer = TcpSocketBuffer::new(unsafe { &mut TCP_SERVER_TX_DATA[..] });
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TcpSocket::new(tcp_rx_buffer, tcp_tx_buffer)
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};
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let client_socket = {
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static mut TCP_CLIENT_RX_DATA: [u8; 1024] = [0; 1024];
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static mut TCP_CLIENT_TX_DATA: [u8; 1024] = [0; 1024];
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let tcp_rx_buffer = TcpSocketBuffer::new(unsafe { &mut TCP_CLIENT_RX_DATA[..] });
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let tcp_tx_buffer = TcpSocketBuffer::new(unsafe { &mut TCP_CLIENT_TX_DATA[..] });
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TcpSocket::new(tcp_rx_buffer, tcp_tx_buffer)
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};
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let mut socket_set_entries: [_; 2] = Default::default();
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let mut socket_set = SocketSet::new(&mut socket_set_entries[..]);
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let server_handle = socket_set.add(server_socket);
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let client_handle = socket_set.add(client_socket);
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let mut did_listen = false;
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let mut did_connect = false;
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let mut done = false;
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while !done && clock.elapsed() < 10_000 {
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{
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let socket: &mut TcpSocket = socket_set.get_mut(server_handle).as_socket();
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if !socket.is_active() && !socket.is_listening() {
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if !did_listen {
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debug!("listening");
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socket.listen(1234).unwrap();
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did_listen = true;
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}
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}
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if socket.can_recv() {
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debug!("got {:?}", str::from_utf8(socket.recv(32).unwrap()).unwrap());
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socket.close();
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done = true;
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}
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}
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{
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let socket: &mut TcpSocket = socket_set.get_mut(client_handle).as_socket();
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if !socket.is_open() {
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if !did_connect {
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debug!("connecting");
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socket.connect((IpAddress::v4(127, 0, 0, 1), 1234),
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(IpAddress::Unspecified, 65000)).unwrap();
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did_connect = true;
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}
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}
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if socket.can_send() {
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debug!("sending");
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socket.send_slice(b"0123456789abcdef").unwrap();
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socket.close();
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}
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}
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match iface.poll(&mut socket_set, clock.elapsed()) {
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Ok(Some(poll_at)) => {
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let delay = poll_at - clock.elapsed();
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debug!("sleeping for {} ms", delay);
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clock.advance(delay)
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}
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Ok(None) => clock.advance(1),
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Err(e) => debug!("poll error: {}", e)
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}
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}
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if done {
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info!("done")
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} else {
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error!("this is taking too long, bailing out")
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}
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}
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