2018-09-08 12:50:43 -07:00
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//! The `netutil` module assists with networking
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2018-06-29 14:12:26 -07:00
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2018-09-06 14:13:40 -07:00
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use nix::sys::socket::setsockopt;
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2018-09-07 15:28:22 -07:00
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use nix::sys::socket::sockopt::{ReuseAddr, ReusePort};
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2018-08-28 16:32:40 -07:00
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use pnet_datalink as datalink;
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2018-06-28 11:28:28 -07:00
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use rand::{thread_rng, Rng};
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2018-09-08 12:50:43 -07:00
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use reqwest;
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2018-09-06 14:13:40 -07:00
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use socket2::{Domain, SockAddr, Socket, Type};
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2018-06-28 11:28:28 -07:00
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use std::io;
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2018-08-28 16:32:40 -07:00
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use std::net::{IpAddr, Ipv4Addr, SocketAddr, UdpSocket};
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2018-09-06 14:13:40 -07:00
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use std::os::unix::io::AsRawFd;
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2018-06-29 14:12:26 -07:00
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/// A data type representing a public Udp socket
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pub struct UdpSocketPair {
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pub addr: SocketAddr, // Public address of the socket
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pub receiver: UdpSocket, // Locally bound socket that can receive from the public address
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pub sender: UdpSocket, // Locally bound socket to send via public address
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}
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2018-06-29 16:49:23 -07:00
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/// Tries to determine the public IP address of this machine
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pub fn get_public_ip_addr() -> Result<IpAddr, String> {
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let body = reqwest::get("http://ifconfig.co/ip")
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.map_err(|err| err.to_string())?
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.text()
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.map_err(|err| err.to_string())?;
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match body.lines().next() {
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Some(ip) => Result::Ok(ip.parse().unwrap()),
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None => Result::Err("Empty response body".to_string()),
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}
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}
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2018-08-28 16:32:40 -07:00
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pub fn parse_port_or_addr(optstr: Option<&str>, default_port: u16) -> SocketAddr {
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2018-08-30 12:07:54 -07:00
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let daddr = SocketAddr::from(([0, 0, 0, 0], default_port));
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2018-08-28 16:32:40 -07:00
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if let Some(addrstr) = optstr {
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if let Ok(port) = addrstr.parse() {
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let mut addr = daddr;
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addr.set_port(port);
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addr
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} else if let Ok(addr) = addrstr.parse() {
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addr
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} else {
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daddr
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}
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} else {
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daddr
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}
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}
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pub fn get_ip_addr() -> Option<IpAddr> {
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2018-09-19 14:34:21 -07:00
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let mut ifaces = datalink::interfaces();
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// put eth0 and wifi0, etc. up front of our list of candidates
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ifaces.sort_by(|a, b| {
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a.name
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.chars()
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.last()
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.unwrap()
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.cmp(&b.name.chars().last().unwrap())
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});
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for iface in ifaces {
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2018-08-28 16:32:40 -07:00
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for p in iface.ips {
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2018-09-19 14:34:21 -07:00
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trace!("get_ip_addr considering iface {} {}", iface.name, p);
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if p.ip().is_loopback() {
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trace!(" loopback");
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continue;
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}
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if p.ip().is_multicast() {
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trace!(" multicast");
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continue;
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}
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match p.ip() {
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IpAddr::V4(addr) => {
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if addr.is_link_local() {
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trace!(" link local");
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continue;
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2018-08-28 16:32:40 -07:00
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}
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2018-09-19 14:34:21 -07:00
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trace!(" using ==> {}", p.ip());
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return Some(p.ip());
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}
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IpAddr::V6(_addr) => {
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// Select an ipv6 address if the config is selected
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#[cfg(feature = "ipv6")]
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{
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return Some(p.ip());
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2018-08-28 16:32:40 -07:00
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}
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}
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}
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}
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}
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None
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}
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2018-06-28 11:28:28 -07:00
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2018-09-08 12:50:43 -07:00
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fn udp_socket(reuseaddr: bool) -> io::Result<Socket> {
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let sock = Socket::new(Domain::ipv4(), Type::dgram(), None)?;
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let sock_fd = sock.as_raw_fd();
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if reuseaddr {
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// best effort, i.e. ignore errors here, we'll get the failure in caller
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setsockopt(sock_fd, ReusePort, &true).ok();
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setsockopt(sock_fd, ReuseAddr, &true).ok();
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}
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Ok(sock)
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}
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pub fn bind_in_range(range: (u16, u16)) -> io::Result<(u16, UdpSocket)> {
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let sock = udp_socket(false)?;
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2018-08-28 16:32:40 -07:00
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let (start, end) = range;
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let mut tries_left = end - start;
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loop {
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2018-06-28 11:28:28 -07:00
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let rand_port = thread_rng().gen_range(start, end);
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let addr = SocketAddr::new(IpAddr::V4(Ipv4Addr::new(0, 0, 0, 0)), rand_port);
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2018-09-06 14:13:40 -07:00
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match sock.bind(&SockAddr::from(addr)) {
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2018-09-08 12:50:43 -07:00
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Ok(_) => {
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let sock = sock.into_udp_socket();
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break Result::Ok((sock.local_addr().unwrap().port(), sock));
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}
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Err(err) => if err.kind() != io::ErrorKind::AddrInUse || tries_left == 0 {
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2018-06-28 11:28:28 -07:00
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return Err(err);
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},
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}
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2018-08-28 16:32:40 -07:00
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tries_left -= 1;
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}
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}
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2018-09-08 12:50:43 -07:00
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// binds many sockets to the same port in a range
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pub fn multi_bind_in_range(range: (u16, u16), num: usize) -> io::Result<(u16, Vec<UdpSocket>)> {
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let mut sockets = Vec::with_capacity(num);
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let port = {
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let (port, _) = bind_in_range(range)?;
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port
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}; // drop the probe, port should be available... briefly.
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for _ in 0..num {
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sockets.push(bind_to(port, true)?);
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}
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Ok((port, sockets))
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}
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pub fn bind_to(port: u16, reuseaddr: bool) -> io::Result<UdpSocket> {
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let sock = udp_socket(reuseaddr)?;
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let addr = SocketAddr::new(IpAddr::V4(Ipv4Addr::new(0, 0, 0, 0)), port);
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2018-09-06 14:13:40 -07:00
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match sock.bind(&SockAddr::from(addr)) {
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2018-09-08 12:50:43 -07:00
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Ok(_) => Result::Ok(sock.into_udp_socket()),
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Err(err) => Err(err),
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2018-09-06 14:13:40 -07:00
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}
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}
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2018-08-28 16:32:40 -07:00
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#[cfg(test)]
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mod tests {
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2018-09-08 12:50:43 -07:00
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use netutil::*;
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2018-08-28 16:32:40 -07:00
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#[test]
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fn test_parse_port_or_addr() {
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let p1 = parse_port_or_addr(Some("9000"), 1);
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assert_eq!(p1.port(), 9000);
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let p2 = parse_port_or_addr(Some("127.0.0.1:7000"), 1);
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assert_eq!(p2.port(), 7000);
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let p2 = parse_port_or_addr(Some("hi there"), 1);
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assert_eq!(p2.port(), 1);
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let p3 = parse_port_or_addr(None, 1);
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assert_eq!(p3.port(), 1);
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2018-06-28 11:28:28 -07:00
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}
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2018-09-08 12:50:43 -07:00
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#[test]
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fn test_bind() {
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assert_eq!(bind_in_range((2000, 2001)).unwrap().0, 2000);
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let x = bind_to(2002, true).unwrap();
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let y = bind_to(2002, true).unwrap();
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assert_eq!(
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x.local_addr().unwrap().port(),
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y.local_addr().unwrap().port()
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);
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let (port, v) = multi_bind_in_range((2010, 2110), 10).unwrap();
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for sock in &v {
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assert_eq!(port, sock.local_addr().unwrap().port());
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}
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}
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#[test]
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#[should_panic]
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fn test_bind_in_range_nil() {
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let _ = bind_in_range((2000, 2000));
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}
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2018-06-28 11:28:28 -07:00
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}
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