src/libstd/net/addr.rs - third_party/rust - Git at Google

 // Copyright 2015 The Rust Project Developers. See the COPYRIGHT
 // file at the top-level directory of this distribution and at
 // http://rust-lang.org/COPYRIGHT.
 //
 // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
 // http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
 // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.

 use prelude::v1::*;

 use fmt;
 use hash;
 use io;
 use mem;
 use net::{lookup_host, ntoh, hton, IpAddr, Ipv4Addr, Ipv6Addr};
 use option;
 use sys::net::netc as c;
 use sys_common::{FromInner, AsInner, IntoInner};
 use vec;
 use iter;
 use slice;

 /// Representation of a socket address for networking applications.
 ///
 /// A socket address can either represent the IPv4 or IPv6 protocol and is
 /// paired with at least a port number as well. Each protocol may have more
 /// specific information about the address available to it as well.
 #[derive(Copy, Clone, PartialEq, Eq, Hash, Debug)]
 #[stable(feature = "rust1", since = "1.0.0")]
 pub enum SocketAddr {
     /// An IPv4 socket address which is a (ip, port) combination.
     #[stable(feature = "rust1", since = "1.0.0")]
     V4(#[stable(feature = "rust1", since = "1.0.0")] SocketAddrV4),
     /// An IPv6 socket address
     #[stable(feature = "rust1", since = "1.0.0")]
     V6(#[stable(feature = "rust1", since = "1.0.0")] SocketAddrV6),
 }

 /// An IPv4 socket address which is a (ip, port) combination.
 #[derive(Copy)]
 #[stable(feature = "rust1", since = "1.0.0")]
 pub struct SocketAddrV4 { inner: c::sockaddr_in }

 /// An IPv6 socket address.
 #[derive(Copy)]
 #[stable(feature = "rust1", since = "1.0.0")]
 pub struct SocketAddrV6 { inner: c::sockaddr_in6 }

 impl SocketAddr {
     /// Creates a new socket address from the (ip, port) pair.
     #[stable(feature = "ip_addr", since = "1.7.0")]
     pub fn new(ip: IpAddr, port: u16) -> SocketAddr {
         match ip {
             IpAddr::V4(a) => SocketAddr::V4(SocketAddrV4::new(a, port)),
             IpAddr::V6(a) => SocketAddr::V6(SocketAddrV6::new(a, port, 0, 0)),
         }
     }

     /// Returns the IP address associated with this socket address.
     #[stable(feature = "ip_addr", since = "1.7.0")]
     pub fn ip(&self) -> IpAddr {
         match *self {
             SocketAddr::V4(ref a) => IpAddr::V4(*a.ip()),
             SocketAddr::V6(ref a) => IpAddr::V6(*a.ip()),
         }
     }

     /// Change the IP address associated with this socket address.
     #[stable(feature = "sockaddr_setters", since = "1.9.0")]
     pub fn set_ip(&mut self, new_ip: IpAddr) {
         // `match (*self, new_ip)` would have us mutate a copy of self only to throw it away.
         match (self, new_ip) {
             (&mut SocketAddr::V4(ref mut a), IpAddr::V4(new_ip)) => a.set_ip(new_ip),
             (&mut SocketAddr::V6(ref mut a), IpAddr::V6(new_ip)) => a.set_ip(new_ip),
             (self_, new_ip) => *self_ = Self::new(new_ip, self_.port()),
         }
     }

     /// Returns the port number associated with this socket address.
     #[stable(feature = "rust1", since = "1.0.0")]
     pub fn port(&self) -> u16 {
         match *self {
             SocketAddr::V4(ref a) => a.port(),
             SocketAddr::V6(ref a) => a.port(),
         }
     }

     /// Change the port number associated with this socket address.
     #[stable(feature = "sockaddr_setters", since = "1.9.0")]
     pub fn set_port(&mut self, new_port: u16) {
         match *self {
             SocketAddr::V4(ref mut a) => a.set_port(new_port),
             SocketAddr::V6(ref mut a) => a.set_port(new_port),
         }
     }
 }

 impl SocketAddrV4 {
     /// Creates a new socket address from the (ip, port) pair.
     #[stable(feature = "rust1", since = "1.0.0")]
     pub fn new(ip: Ipv4Addr, port: u16) -> SocketAddrV4 {
         SocketAddrV4 {
             inner: c::sockaddr_in {
                 sin_family: c::AF_INET as c::sa_family_t,
                 sin_port: hton(port),
                 sin_addr: *ip.as_inner(),
                 .. unsafe { mem::zeroed() }
             },
         }
     }

     /// Returns the IP address associated with this socket address.
     #[stable(feature = "rust1", since = "1.0.0")]
     pub fn ip(&self) -> &Ipv4Addr {
         unsafe {
             &*(&self.inner.sin_addr as *const c::in_addr as *const Ipv4Addr)
         }
     }

     /// Change the IP address associated with this socket address.
     #[stable(feature = "sockaddr_setters", since = "1.9.0")]
     pub fn set_ip(&mut self, new_ip: Ipv4Addr) {
         self.inner.sin_addr = *new_ip.as_inner()
     }

     /// Returns the port number associated with this socket address.
     #[stable(feature = "rust1", since = "1.0.0")]
     pub fn port(&self) -> u16 {
         ntoh(self.inner.sin_port)
     }

     /// Change the port number associated with this socket address.
     #[stable(feature = "sockaddr_setters", since = "1.9.0")]
     pub fn set_port(&mut self, new_port: u16) {
         self.inner.sin_port = hton(new_port);
     }
 }

 impl SocketAddrV6 {
     /// Creates a new socket address from the ip/port/flowinfo/scope_id
     /// components.
     #[stable(feature = "rust1", since = "1.0.0")]
     pub fn new(ip: Ipv6Addr, port: u16, flowinfo: u32, scope_id: u32)
                -> SocketAddrV6 {
         SocketAddrV6 {
             inner: c::sockaddr_in6 {
                 sin6_family: c::AF_INET6 as c::sa_family_t,
                 sin6_port: hton(port),
                 sin6_addr: *ip.as_inner(),
                 sin6_flowinfo: flowinfo,
                 sin6_scope_id: scope_id,
                 .. unsafe { mem::zeroed() }
             },
         }
     }

     /// Returns the IP address associated with this socket address.
     #[stable(feature = "rust1", since = "1.0.0")]
     pub fn ip(&self) -> &Ipv6Addr {
         unsafe {
             &*(&self.inner.sin6_addr as *const c::in6_addr as *const Ipv6Addr)
         }
     }

     /// Change the IP address associated with this socket address.
     #[stable(feature = "sockaddr_setters", since = "1.9.0")]
     pub fn set_ip(&mut self, new_ip: Ipv6Addr) {
         self.inner.sin6_addr = *new_ip.as_inner()
     }

     /// Returns the port number associated with this socket address.
     #[stable(feature = "rust1", since = "1.0.0")]
     pub fn port(&self) -> u16 {
         ntoh(self.inner.sin6_port)
     }

     /// Change the port number associated with this socket address.
     #[stable(feature = "sockaddr_setters", since = "1.9.0")]
     pub fn set_port(&mut self, new_port: u16) {
         self.inner.sin6_port = hton(new_port);
     }

     /// Returns the flow information associated with this address,
     /// corresponding to the `sin6_flowinfo` field in C.
     #[stable(feature = "rust1", since = "1.0.0")]
     pub fn flowinfo(&self) -> u32 {
         self.inner.sin6_flowinfo
     }

     /// Change the flow information associated with this socket address.
     #[stable(feature = "sockaddr_setters", since = "1.9.0")]
     pub fn set_flowinfo(&mut self, new_flowinfo: u32) {
         self.inner.sin6_flowinfo = new_flowinfo;
     }

     /// Returns the scope ID associated with this address,
     /// corresponding to the `sin6_scope_id` field in C.
     #[stable(feature = "rust1", since = "1.0.0")]
     pub fn scope_id(&self) -> u32 {
         self.inner.sin6_scope_id
     }

     /// Change the scope ID associated with this socket address.
     #[stable(feature = "sockaddr_setters", since = "1.9.0")]
     pub fn set_scope_id(&mut self, new_scope_id: u32) {
         self.inner.sin6_scope_id = new_scope_id;
     }
 }

 impl FromInner<c::sockaddr_in> for SocketAddrV4 {
     fn from_inner(addr: c::sockaddr_in) -> SocketAddrV4 {
         SocketAddrV4 { inner: addr }
     }
 }

 impl FromInner<c::sockaddr_in6> for SocketAddrV6 {
     fn from_inner(addr: c::sockaddr_in6) -> SocketAddrV6 {
         SocketAddrV6 { inner: addr }
     }
 }

 impl<'a> IntoInner<(*const c::sockaddr, c::socklen_t)> for &'a SocketAddr {
     fn into_inner(self) -> (*const c::sockaddr, c::socklen_t) {
         match *self {
             SocketAddr::V4(ref a) => {
                 (a as *const _ as *const _, mem::size_of_val(a) as c::socklen_t)
             }
             SocketAddr::V6(ref a) => {
                 (a as *const _ as *const _, mem::size_of_val(a) as c::socklen_t)
             }
         }
     }
 }

 #[stable(feature = "rust1", since = "1.0.0")]
 impl fmt::Display for SocketAddr {
     fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
         match *self {
             SocketAddr::V4(ref a) => a.fmt(f),
             SocketAddr::V6(ref a) => a.fmt(f),
         }
     }
 }

 #[stable(feature = "rust1", since = "1.0.0")]
 impl fmt::Display for SocketAddrV4 {
     fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
         write!(f, "{}:{}", self.ip(), self.port())
     }
 }

 #[stable(feature = "rust1", since = "1.0.0")]
 impl fmt::Debug for SocketAddrV4 {
     fn fmt(&self, fmt: &mut fmt::Formatter) -> fmt::Result {
         fmt::Display::fmt(self, fmt)
     }
 }

 #[stable(feature = "rust1", since = "1.0.0")]
 impl fmt::Display for SocketAddrV6 {
     fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
         write!(f, "[{}]:{}", self.ip(), self.port())
     }
 }

 #[stable(feature = "rust1", since = "1.0.0")]
 impl fmt::Debug for SocketAddrV6 {
     fn fmt(&self, fmt: &mut fmt::Formatter) -> fmt::Result {
         fmt::Display::fmt(self, fmt)
     }
 }

 #[stable(feature = "rust1", since = "1.0.0")]
 impl Clone for SocketAddrV4 {
     fn clone(&self) -> SocketAddrV4 { *self }
 }
 #[stable(feature = "rust1", since = "1.0.0")]
 impl Clone for SocketAddrV6 {
     fn clone(&self) -> SocketAddrV6 { *self }
 }

 #[stable(feature = "rust1", since = "1.0.0")]
 impl PartialEq for SocketAddrV4 {
     fn eq(&self, other: &SocketAddrV4) -> bool {
         self.inner.sin_port == other.inner.sin_port &&
             self.inner.sin_addr.s_addr == other.inner.sin_addr.s_addr
     }
 }
 #[stable(feature = "rust1", since = "1.0.0")]
 impl PartialEq for SocketAddrV6 {
     fn eq(&self, other: &SocketAddrV6) -> bool {
         self.inner.sin6_port == other.inner.sin6_port &&
             self.inner.sin6_addr.s6_addr == other.inner.sin6_addr.s6_addr &&
             self.inner.sin6_flowinfo == other.inner.sin6_flowinfo &&
             self.inner.sin6_scope_id == other.inner.sin6_scope_id
     }
 }
 #[stable(feature = "rust1", since = "1.0.0")]
 impl Eq for SocketAddrV4 {}
 #[stable(feature = "rust1", since = "1.0.0")]
 impl Eq for SocketAddrV6 {}

 #[stable(feature = "rust1", since = "1.0.0")]
 impl hash::Hash for SocketAddrV4 {
     fn hash<H: hash::Hasher>(&self, s: &mut H) {
         (self.inner.sin_port, self.inner.sin_addr.s_addr).hash(s)
     }
 }
 #[stable(feature = "rust1", since = "1.0.0")]
 impl hash::Hash for SocketAddrV6 {
     fn hash<H: hash::Hasher>(&self, s: &mut H) {
         (self.inner.sin6_port, &self.inner.sin6_addr.s6_addr,
          self.inner.sin6_flowinfo, self.inner.sin6_scope_id).hash(s)
     }
 }

 /// A trait for objects which can be converted or resolved to one or more
 /// `SocketAddr` values.
 ///
 /// This trait is used for generic address resolution when constructing network
 /// objects.  By default it is implemented for the following types:
 ///
 ///  * `SocketAddr`, `SocketAddrV4`, `SocketAddrV6` - `to_socket_addrs` is
 ///    identity function.
 ///
 ///  * `(IpvNAddr, u16)` - `to_socket_addrs` constructs `SocketAddr` trivially.
 ///
 ///  * `(&str, u16)` - the string should be either a string representation of an
 ///    IP address expected by `FromStr` implementation for `IpvNAddr` or a host
 ///    name.
 ///
 ///  * `&str` - the string should be either a string representation of a
 ///    `SocketAddr` as expected by its `FromStr` implementation or a string like
 ///    `<host_name>:<port>` pair where `<port>` is a `u16` value.
 ///
 /// This trait allows constructing network objects like `TcpStream` or
 /// `UdpSocket` easily with values of various types for the bind/connection
 /// address. It is needed because sometimes one type is more appropriate than
 /// the other: for simple uses a string like `"localhost:12345"` is much nicer
 /// than manual construction of the corresponding `SocketAddr`, but sometimes
 /// `SocketAddr` value is *the* main source of the address, and converting it to
 /// some other type (e.g. a string) just for it to be converted back to
 /// `SocketAddr` in constructor methods is pointless.
 ///
 /// Addresses returned by the operating system that are not IP addresses are
 /// silently ignored.
 ///
 /// Some examples:
 ///
 /// ```no_run
 /// use std::net::{SocketAddrV4, TcpStream, UdpSocket, TcpListener, Ipv4Addr};
 ///
 /// fn main() {
 ///     let ip = Ipv4Addr::new(127, 0, 0, 1);
 ///     let port = 12345;
 ///
 ///     // The following lines are equivalent modulo possible "localhost" name
 ///     // resolution differences
 ///     let tcp_s = TcpStream::connect(SocketAddrV4::new(ip, port));
 ///     let tcp_s = TcpStream::connect((ip, port));
 ///     let tcp_s = TcpStream::connect(("127.0.0.1", port));
 ///     let tcp_s = TcpStream::connect(("localhost", port));
 ///     let tcp_s = TcpStream::connect("127.0.0.1:12345");
 ///     let tcp_s = TcpStream::connect("localhost:12345");
 ///
 ///     // TcpListener::bind(), UdpSocket::bind() and UdpSocket::send_to()
 ///     // behave similarly
 ///     let tcp_l = TcpListener::bind("localhost:12345");
 ///
 ///     let mut udp_s = UdpSocket::bind(("127.0.0.1", port)).unwrap();
 ///     udp_s.send_to(&[7], (ip, 23451)).unwrap();
 /// }
 /// ```
 #[stable(feature = "rust1", since = "1.0.0")]
 pub trait ToSocketAddrs {
     /// Returned iterator over socket addresses which this type may correspond
     /// to.
     #[stable(feature = "rust1", since = "1.0.0")]
     type Iter: Iterator<Item=SocketAddr>;

     /// Converts this object to an iterator of resolved `SocketAddr`s.
     ///
     /// The returned iterator may not actually yield any values depending on the
     /// outcome of any resolution performed.
     ///
     /// Note that this function may block the current thread while resolution is
     /// performed.
     ///
     /// # Errors
     ///
     /// Any errors encountered during resolution will be returned as an `Err`.
     #[stable(feature = "rust1", since = "1.0.0")]
     fn to_socket_addrs(&self) -> io::Result<Self::Iter>;
 }

 #[stable(feature = "rust1", since = "1.0.0")]
 impl ToSocketAddrs for SocketAddr {
     type Iter = option::IntoIter<SocketAddr>;
     fn to_socket_addrs(&self) -> io::Result<option::IntoIter<SocketAddr>> {
         Ok(Some(*self).into_iter())
     }
 }

 #[stable(feature = "rust1", since = "1.0.0")]
 impl ToSocketAddrs for SocketAddrV4 {
     type Iter = option::IntoIter<SocketAddr>;
     fn to_socket_addrs(&self) -> io::Result<option::IntoIter<SocketAddr>> {
         SocketAddr::V4(*self).to_socket_addrs()
     }
 }

 #[stable(feature = "rust1", since = "1.0.0")]
 impl ToSocketAddrs for SocketAddrV6 {
     type Iter = option::IntoIter<SocketAddr>;
     fn to_socket_addrs(&self) -> io::Result<option::IntoIter<SocketAddr>> {
         SocketAddr::V6(*self).to_socket_addrs()
     }
 }

 #[stable(feature = "rust1", since = "1.0.0")]
 impl ToSocketAddrs for (IpAddr, u16) {
     type Iter = option::IntoIter<SocketAddr>;
     fn to_socket_addrs(&self) -> io::Result<option::IntoIter<SocketAddr>> {
         let (ip, port) = *self;
         match ip {
             IpAddr::V4(ref a) => (*a, port).to_socket_addrs(),
             IpAddr::V6(ref a) => (*a, port).to_socket_addrs(),
         }
     }
 }

 #[stable(feature = "rust1", since = "1.0.0")]
 impl ToSocketAddrs for (Ipv4Addr, u16) {
     type Iter = option::IntoIter<SocketAddr>;
     fn to_socket_addrs(&self) -> io::Result<option::IntoIter<SocketAddr>> {
         let (ip, port) = *self;
         SocketAddrV4::new(ip, port).to_socket_addrs()
     }
 }

 #[stable(feature = "rust1", since = "1.0.0")]
 impl ToSocketAddrs for (Ipv6Addr, u16) {
     type Iter = option::IntoIter<SocketAddr>;
     fn to_socket_addrs(&self) -> io::Result<option::IntoIter<SocketAddr>> {
         let (ip, port) = *self;
         SocketAddrV6::new(ip, port, 0, 0).to_socket_addrs()
     }
 }

 fn resolve_socket_addr(s: &str, p: u16) -> io::Result<vec::IntoIter<SocketAddr>> {
     let ips = lookup_host(s)?;
     let v: Vec<_> = ips.map(|mut a| { a.set_port(p); a }).collect();
     Ok(v.into_iter())
 }

 #[stable(feature = "rust1", since = "1.0.0")]
 impl<'a> ToSocketAddrs for (&'a str, u16) {
     type Iter = vec::IntoIter<SocketAddr>;
     fn to_socket_addrs(&self) -> io::Result<vec::IntoIter<SocketAddr>> {
         let (host, port) = *self;

         // try to parse the host as a regular IP address first
         if let Ok(addr) = host.parse::<Ipv4Addr>() {
             let addr = SocketAddrV4::new(addr, port);
             return Ok(vec![SocketAddr::V4(addr)].into_iter())
         }
         if let Ok(addr) = host.parse::<Ipv6Addr>() {
             let addr = SocketAddrV6::new(addr, port, 0, 0);
             return Ok(vec![SocketAddr::V6(addr)].into_iter())
         }

         resolve_socket_addr(host, port)
     }
 }

 // accepts strings like 'localhost:12345'
 #[stable(feature = "rust1", since = "1.0.0")]
 impl ToSocketAddrs for str {
     type Iter = vec::IntoIter<SocketAddr>;
     fn to_socket_addrs(&self) -> io::Result<vec::IntoIter<SocketAddr>> {
         // try to parse as a regular SocketAddr first
         if let Some(addr) = self.parse().ok() {
             return Ok(vec![addr].into_iter());
         }

         macro_rules! try_opt {
             ($e:expr, $msg:expr) => (
                 match $e {
                     Some(r) => r,
                     None => return Err(io::Error::new(io::ErrorKind::InvalidInput,
                                                       $msg)),
                 }
             )
         }

         // split the string by ':' and convert the second part to u16
         let mut parts_iter = self.rsplitn(2, ':');
         let port_str = try_opt!(parts_iter.next(), "invalid socket address");
         let host = try_opt!(parts_iter.next(), "invalid socket address");
         let port: u16 = try_opt!(port_str.parse().ok(), "invalid port value");
         resolve_socket_addr(host, port)
     }
 }

 #[stable(feature = "slice_to_socket_addrs", since = "1.8.0")]
 impl<'a> ToSocketAddrs for &'a [SocketAddr] {
     type Iter = iter::Cloned<slice::Iter<'a, SocketAddr>>;

     fn to_socket_addrs(&self) -> io::Result<Self::Iter> {
         Ok(self.iter().cloned())
     }
 }

 #[stable(feature = "rust1", since = "1.0.0")]
 impl<'a, T: ToSocketAddrs + ?Sized> ToSocketAddrs for &'a T {
     type Iter = T::Iter;
     fn to_socket_addrs(&self) -> io::Result<T::Iter> {
         (**self).to_socket_addrs()
     }
 }

 #[cfg(test)]
 mod tests {
     use prelude::v1::*;
     use net::*;
     use net::test::{tsa, sa6, sa4};

     #[test]
     fn to_socket_addr_ipaddr_u16() {
         let a = Ipv4Addr::new(77, 88, 21, 11);
         let p = 12345;
         let e = SocketAddr::V4(SocketAddrV4::new(a, p));
         assert_eq!(Ok(vec![e]), tsa((a, p)));
     }

     #[test]
     fn to_socket_addr_str_u16() {
         let a = sa4(Ipv4Addr::new(77, 88, 21, 11), 24352);
         assert_eq!(Ok(vec![a]), tsa(("77.88.21.11", 24352)));

         let a = sa6(Ipv6Addr::new(0x2a02, 0x6b8, 0, 1, 0, 0, 0, 1), 53);
         assert_eq!(Ok(vec![a]), tsa(("2a02:6b8:0:1::1", 53)));

         let a = sa4(Ipv4Addr::new(127, 0, 0, 1), 23924);
         assert!(tsa(("localhost", 23924)).unwrap().contains(&a));
     }

     #[test]
     fn to_socket_addr_str() {
         let a = sa4(Ipv4Addr::new(77, 88, 21, 11), 24352);
         assert_eq!(Ok(vec![a]), tsa("77.88.21.11:24352"));

         let a = sa6(Ipv6Addr::new(0x2a02, 0x6b8, 0, 1, 0, 0, 0, 1), 53);
         assert_eq!(Ok(vec![a]), tsa("[2a02:6b8:0:1::1]:53"));

         let a = sa4(Ipv4Addr::new(127, 0, 0, 1), 23924);
         assert!(tsa("localhost:23924").unwrap().contains(&a));
     }

     // FIXME: figure out why this fails on openbsd and bitrig and fix it
     #[test]
     #[cfg(not(any(windows, target_os = "openbsd", target_os = "bitrig")))]
     fn to_socket_addr_str_bad() {
         assert!(tsa("1200::AB00:1234::2552:7777:1313:34300").is_err());
     }

     #[test]
     fn set_ip() {
         fn ip4(low: u8) -> Ipv4Addr { Ipv4Addr::new(77, 88, 21, low) }
         fn ip6(low: u16) -> Ipv6Addr { Ipv6Addr::new(0x2a02, 0x6b8, 0, 1, 0, 0, 0, low) }

         let mut v4 = SocketAddrV4::new(ip4(11), 80);
         assert_eq!(v4.ip(), &ip4(11));
         v4.set_ip(ip4(12));
         assert_eq!(v4.ip(), &ip4(12));

         let mut addr = SocketAddr::V4(v4);
         assert_eq!(addr.ip(), IpAddr::V4(ip4(12)));
         addr.set_ip(IpAddr::V4(ip4(13)));
         assert_eq!(addr.ip(), IpAddr::V4(ip4(13)));
         addr.set_ip(IpAddr::V6(ip6(14)));
         assert_eq!(addr.ip(), IpAddr::V6(ip6(14)));

         let mut v6 = SocketAddrV6::new(ip6(1), 80, 0, 0);
         assert_eq!(v6.ip(), &ip6(1));
         v6.set_ip(ip6(2));
         assert_eq!(v6.ip(), &ip6(2));

         let mut addr = SocketAddr::V6(v6);
         assert_eq!(addr.ip(), IpAddr::V6(ip6(2)));
         addr.set_ip(IpAddr::V6(ip6(3)));
         assert_eq!(addr.ip(), IpAddr::V6(ip6(3)));
         addr.set_ip(IpAddr::V4(ip4(4)));
         assert_eq!(addr.ip(), IpAddr::V4(ip4(4)));
     }

     #[test]
     fn set_port() {
         let mut v4 = SocketAddrV4::new(Ipv4Addr::new(77, 88, 21, 11), 80);
         assert_eq!(v4.port(), 80);
         v4.set_port(443);
         assert_eq!(v4.port(), 443);

         let mut addr = SocketAddr::V4(v4);
         assert_eq!(addr.port(), 443);
         addr.set_port(8080);
         assert_eq!(addr.port(), 8080);

         let mut v6 = SocketAddrV6::new(Ipv6Addr::new(0x2a02, 0x6b8, 0, 1, 0, 0, 0, 1), 80, 0, 0);
         assert_eq!(v6.port(), 80);
         v6.set_port(443);
         assert_eq!(v6.port(), 443);

         let mut addr = SocketAddr::V6(v6);
         assert_eq!(addr.port(), 443);
         addr.set_port(8080);
         assert_eq!(addr.port(), 8080);
     }

     #[test]
     fn set_flowinfo() {
         let mut v6 = SocketAddrV6::new(Ipv6Addr::new(0x2a02, 0x6b8, 0, 1, 0, 0, 0, 1), 80, 10, 0);
         assert_eq!(v6.flowinfo(), 10);
         v6.set_flowinfo(20);
         assert_eq!(v6.flowinfo(), 20);
     }

     #[test]
     fn set_scope_id() {
         let mut v6 = SocketAddrV6::new(Ipv6Addr::new(0x2a02, 0x6b8, 0, 1, 0, 0, 0, 1), 80, 0, 10);
         assert_eq!(v6.scope_id(), 10);
         v6.set_scope_id(20);
         assert_eq!(v6.scope_id(), 20);
     }
 }
	// Copyright 2015 The Rust Project Developers. See the COPYRIGHT
	// file at the top-level directory of this distribution and at
	// http://rust-lang.org/COPYRIGHT.
	//
	// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
	// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
	// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
	// option. This file may not be copied, modified, or distributed
	// except according to those terms.

	use prelude::v1::*;

	use fmt;
	use hash;
	use io;
	use mem;
	use net::{lookup_host, ntoh, hton, IpAddr, Ipv4Addr, Ipv6Addr};
	use option;
	use sys::net::netc as c;
	use sys_common::{FromInner, AsInner, IntoInner};
	use vec;
	use iter;
	use slice;

	/// Representation of a socket address for networking applications.
	///
	/// A socket address can either represent the IPv4 or IPv6 protocol and is
	/// paired with at least a port number as well. Each protocol may have more
	/// specific information about the address available to it as well.
	#[derive(Copy, Clone, PartialEq, Eq, Hash, Debug)]
	#[stable(feature = "rust1", since = "1.0.0")]
	pub enum SocketAddr {
	/// An IPv4 socket address which is a (ip, port) combination.
	#[stable(feature = "rust1", since = "1.0.0")]
	V4(#[stable(feature = "rust1", since = "1.0.0")] SocketAddrV4),
	/// An IPv6 socket address
	#[stable(feature = "rust1", since = "1.0.0")]
	V6(#[stable(feature = "rust1", since = "1.0.0")] SocketAddrV6),
	}

	/// An IPv4 socket address which is a (ip, port) combination.
	#[derive(Copy)]
	#[stable(feature = "rust1", since = "1.0.0")]
	pub struct SocketAddrV4 { inner: c::sockaddr_in }

	/// An IPv6 socket address.
	#[derive(Copy)]
	#[stable(feature = "rust1", since = "1.0.0")]
	pub struct SocketAddrV6 { inner: c::sockaddr_in6 }

	impl SocketAddr {
	/// Creates a new socket address from the (ip, port) pair.
	#[stable(feature = "ip_addr", since = "1.7.0")]
	pub fn new(ip: IpAddr, port: u16) -> SocketAddr {
	match ip {
	IpAddr::V4(a) => SocketAddr::V4(SocketAddrV4::new(a, port)),
	IpAddr::V6(a) => SocketAddr::V6(SocketAddrV6::new(a, port, 0, 0)),
	}
	}

	/// Returns the IP address associated with this socket address.
	#[stable(feature = "ip_addr", since = "1.7.0")]
	pub fn ip(&self) -> IpAddr {
	match *self {
	SocketAddr::V4(ref a) => IpAddr::V4(*a.ip()),
	SocketAddr::V6(ref a) => IpAddr::V6(*a.ip()),
	}
	}

	/// Change the IP address associated with this socket address.
	#[stable(feature = "sockaddr_setters", since = "1.9.0")]
	pub fn set_ip(&mut self, new_ip: IpAddr) {
	// `match (*self, new_ip)` would have us mutate a copy of self only to throw it away.
	match (self, new_ip) {
	(&mut SocketAddr::V4(ref mut a), IpAddr::V4(new_ip)) => a.set_ip(new_ip),
	(&mut SocketAddr::V6(ref mut a), IpAddr::V6(new_ip)) => a.set_ip(new_ip),
	(self_, new_ip) => *self_ = Self::new(new_ip, self_.port()),
	}
	}

	/// Returns the port number associated with this socket address.
	#[stable(feature = "rust1", since = "1.0.0")]
	pub fn port(&self) -> u16 {
	match *self {
	SocketAddr::V4(ref a) => a.port(),
	SocketAddr::V6(ref a) => a.port(),
	}
	}

	/// Change the port number associated with this socket address.
	#[stable(feature = "sockaddr_setters", since = "1.9.0")]
	pub fn set_port(&mut self, new_port: u16) {
	match *self {
	SocketAddr::V4(ref mut a) => a.set_port(new_port),
	SocketAddr::V6(ref mut a) => a.set_port(new_port),
	}
	}
	}

	impl SocketAddrV4 {
	/// Creates a new socket address from the (ip, port) pair.
	#[stable(feature = "rust1", since = "1.0.0")]
	pub fn new(ip: Ipv4Addr, port: u16) -> SocketAddrV4 {
	SocketAddrV4 {
	inner: c::sockaddr_in {
	sin_family: c::AF_INET as c::sa_family_t,
	sin_port: hton(port),
	sin_addr: *ip.as_inner(),
	.. unsafe { mem::zeroed() }
	},
	}
	}

	/// Returns the IP address associated with this socket address.
	#[stable(feature = "rust1", since = "1.0.0")]
	pub fn ip(&self) -> &Ipv4Addr {
	unsafe {
	&(&self.inner.sin_addr as const c::in_addr as *const Ipv4Addr)
	}
	}

	/// Change the IP address associated with this socket address.
	#[stable(feature = "sockaddr_setters", since = "1.9.0")]
	pub fn set_ip(&mut self, new_ip: Ipv4Addr) {
	self.inner.sin_addr = *new_ip.as_inner()
	}

	/// Returns the port number associated with this socket address.
	#[stable(feature = "rust1", since = "1.0.0")]
	pub fn port(&self) -> u16 {
	ntoh(self.inner.sin_port)
	}

	/// Change the port number associated with this socket address.
	#[stable(feature = "sockaddr_setters", since = "1.9.0")]
	pub fn set_port(&mut self, new_port: u16) {
	self.inner.sin_port = hton(new_port);
	}
	}

	impl SocketAddrV6 {
	/// Creates a new socket address from the ip/port/flowinfo/scope_id
	/// components.
	#[stable(feature = "rust1", since = "1.0.0")]
	pub fn new(ip: Ipv6Addr, port: u16, flowinfo: u32, scope_id: u32)
	-> SocketAddrV6 {
	SocketAddrV6 {
	inner: c::sockaddr_in6 {
	sin6_family: c::AF_INET6 as c::sa_family_t,
	sin6_port: hton(port),
	sin6_addr: *ip.as_inner(),
	sin6_flowinfo: flowinfo,
	sin6_scope_id: scope_id,
	.. unsafe { mem::zeroed() }
	},
	}
	}

	/// Returns the IP address associated with this socket address.
	#[stable(feature = "rust1", since = "1.0.0")]
	pub fn ip(&self) -> &Ipv6Addr {
	unsafe {
	&(&self.inner.sin6_addr as const c::in6_addr as *const Ipv6Addr)
	}
	}

	/// Change the IP address associated with this socket address.
	#[stable(feature = "sockaddr_setters", since = "1.9.0")]
	pub fn set_ip(&mut self, new_ip: Ipv6Addr) {
	self.inner.sin6_addr = *new_ip.as_inner()
	}

	/// Returns the port number associated with this socket address.
	#[stable(feature = "rust1", since = "1.0.0")]
	pub fn port(&self) -> u16 {
	ntoh(self.inner.sin6_port)
	}

	/// Change the port number associated with this socket address.
	#[stable(feature = "sockaddr_setters", since = "1.9.0")]
	pub fn set_port(&mut self, new_port: u16) {
	self.inner.sin6_port = hton(new_port);
	}

	/// Returns the flow information associated with this address,
	/// corresponding to the `sin6_flowinfo` field in C.
	#[stable(feature = "rust1", since = "1.0.0")]
	pub fn flowinfo(&self) -> u32 {
	self.inner.sin6_flowinfo
	}

	/// Change the flow information associated with this socket address.
	#[stable(feature = "sockaddr_setters", since = "1.9.0")]
	pub fn set_flowinfo(&mut self, new_flowinfo: u32) {
	self.inner.sin6_flowinfo = new_flowinfo;
	}

	/// Returns the scope ID associated with this address,
	/// corresponding to the `sin6_scope_id` field in C.
	#[stable(feature = "rust1", since = "1.0.0")]
	pub fn scope_id(&self) -> u32 {
	self.inner.sin6_scope_id
	}

	/// Change the scope ID associated with this socket address.
	#[stable(feature = "sockaddr_setters", since = "1.9.0")]
	pub fn set_scope_id(&mut self, new_scope_id: u32) {
	self.inner.sin6_scope_id = new_scope_id;
	}
	}

	impl FromInner<c::sockaddr_in> for SocketAddrV4 {
	fn from_inner(addr: c::sockaddr_in) -> SocketAddrV4 {
	SocketAddrV4 { inner: addr }
	}
	}

	impl FromInner<c::sockaddr_in6> for SocketAddrV6 {
	fn from_inner(addr: c::sockaddr_in6) -> SocketAddrV6 {
	SocketAddrV6 { inner: addr }
	}
	}

	impl<'a> IntoInner<(*const c::sockaddr, c::socklen_t)> for &'a SocketAddr {
	fn into_inner(self) -> (*const c::sockaddr, c::socklen_t) {
	match *self {
	SocketAddr::V4(ref a) => {
	(a as const _ as const _, mem::size_of_val(a) as c::socklen_t)
	}
	SocketAddr::V6(ref a) => {
	(a as const _ as const _, mem::size_of_val(a) as c::socklen_t)
	}
	}
	}
	}

	#[stable(feature = "rust1", since = "1.0.0")]
	impl fmt::Display for SocketAddr {
	fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
	match *self {
	SocketAddr::V4(ref a) => a.fmt(f),
	SocketAddr::V6(ref a) => a.fmt(f),
	}
	}
	}

	#[stable(feature = "rust1", since = "1.0.0")]
	impl fmt::Display for SocketAddrV4 {
	fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
	write!(f, "{}:{}", self.ip(), self.port())
	}
	}

	#[stable(feature = "rust1", since = "1.0.0")]
	impl fmt::Debug for SocketAddrV4 {
	fn fmt(&self, fmt: &mut fmt::Formatter) -> fmt::Result {
	fmt::Display::fmt(self, fmt)
	}
	}

	#[stable(feature = "rust1", since = "1.0.0")]
	impl fmt::Display for SocketAddrV6 {
	fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
	write!(f, "[{}]:{}", self.ip(), self.port())
	}
	}

	#[stable(feature = "rust1", since = "1.0.0")]
	impl fmt::Debug for SocketAddrV6 {
	fn fmt(&self, fmt: &mut fmt::Formatter) -> fmt::Result {
	fmt::Display::fmt(self, fmt)
	}
	}

	#[stable(feature = "rust1", since = "1.0.0")]
	impl Clone for SocketAddrV4 {
	fn clone(&self) -> SocketAddrV4 { *self }
	}
	#[stable(feature = "rust1", since = "1.0.0")]
	impl Clone for SocketAddrV6 {
	fn clone(&self) -> SocketAddrV6 { *self }
	}

	#[stable(feature = "rust1", since = "1.0.0")]
	impl PartialEq for SocketAddrV4 {
	fn eq(&self, other: &SocketAddrV4) -> bool {
	self.inner.sin_port == other.inner.sin_port &&
	self.inner.sin_addr.s_addr == other.inner.sin_addr.s_addr
	}
	}
	#[stable(feature = "rust1", since = "1.0.0")]
	impl PartialEq for SocketAddrV6 {
	fn eq(&self, other: &SocketAddrV6) -> bool {
	self.inner.sin6_port == other.inner.sin6_port &&
	self.inner.sin6_addr.s6_addr == other.inner.sin6_addr.s6_addr &&
	self.inner.sin6_flowinfo == other.inner.sin6_flowinfo &&
	self.inner.sin6_scope_id == other.inner.sin6_scope_id
	}
	}
	#[stable(feature = "rust1", since = "1.0.0")]
	impl Eq for SocketAddrV4 {}
	#[stable(feature = "rust1", since = "1.0.0")]
	impl Eq for SocketAddrV6 {}

	#[stable(feature = "rust1", since = "1.0.0")]
	impl hash::Hash for SocketAddrV4 {
	fn hash<H: hash::Hasher>(&self, s: &mut H) {
	(self.inner.sin_port, self.inner.sin_addr.s_addr).hash(s)
	}
	}
	#[stable(feature = "rust1", since = "1.0.0")]
	impl hash::Hash for SocketAddrV6 {
	fn hash<H: hash::Hasher>(&self, s: &mut H) {
	(self.inner.sin6_port, &self.inner.sin6_addr.s6_addr,
	self.inner.sin6_flowinfo, self.inner.sin6_scope_id).hash(s)
	}
	}

	/// A trait for objects which can be converted or resolved to one or more
	/// `SocketAddr` values.
	///
	/// This trait is used for generic address resolution when constructing network
	/// objects. By default it is implemented for the following types:
	///
	/// * `SocketAddr`, `SocketAddrV4`, `SocketAddrV6` - `to_socket_addrs` is
	/// identity function.
	///
	/// * `(IpvNAddr, u16)` - `to_socket_addrs` constructs `SocketAddr` trivially.
	///
	/// * `(&str, u16)` - the string should be either a string representation of an
	/// IP address expected by `FromStr` implementation for `IpvNAddr` or a host
	/// name.
	///
	/// * `&str` - the string should be either a string representation of a
	/// `SocketAddr` as expected by its `FromStr` implementation or a string like
	/// `<host_name>:<port>` pair where `<port>` is a `u16` value.
	///
	/// This trait allows constructing network objects like `TcpStream` or
	/// `UdpSocket` easily with values of various types for the bind/connection
	/// address. It is needed because sometimes one type is more appropriate than
	/// the other: for simple uses a string like `"localhost:12345"` is much nicer
	/// than manual construction of the corresponding `SocketAddr`, but sometimes
	/// `SocketAddr` value is the main source of the address, and converting it to
	/// some other type (e.g. a string) just for it to be converted back to
	/// `SocketAddr` in constructor methods is pointless.
	///
	/// Addresses returned by the operating system that are not IP addresses are
	/// silently ignored.
	///
	/// Some examples:
	///
	/// ```no_run
	/// use std::net::{SocketAddrV4, TcpStream, UdpSocket, TcpListener, Ipv4Addr};
	///
	/// fn main() {
	/// let ip = Ipv4Addr::new(127, 0, 0, 1);
	/// let port = 12345;
	///
	/// // The following lines are equivalent modulo possible "localhost" name
	/// // resolution differences
	/// let tcp_s = TcpStream::connect(SocketAddrV4::new(ip, port));
	/// let tcp_s = TcpStream::connect((ip, port));
	/// let tcp_s = TcpStream::connect(("127.0.0.1", port));
	/// let tcp_s = TcpStream::connect(("localhost", port));
	/// let tcp_s = TcpStream::connect("127.0.0.1:12345");
	/// let tcp_s = TcpStream::connect("localhost:12345");
	///
	/// // TcpListener::bind(), UdpSocket::bind() and UdpSocket::send_to()
	/// // behave similarly
	/// let tcp_l = TcpListener::bind("localhost:12345");
	///
	/// let mut udp_s = UdpSocket::bind(("127.0.0.1", port)).unwrap();
	/// udp_s.send_to(&[7], (ip, 23451)).unwrap();
	/// }
	/// ```
	#[stable(feature = "rust1", since = "1.0.0")]
	pub trait ToSocketAddrs {
	/// Returned iterator over socket addresses which this type may correspond
	/// to.
	#[stable(feature = "rust1", since = "1.0.0")]
	type Iter: Iterator<Item=SocketAddr>;

	/// Converts this object to an iterator of resolved `SocketAddr`s.
	///
	/// The returned iterator may not actually yield any values depending on the
	/// outcome of any resolution performed.
	///
	/// Note that this function may block the current thread while resolution is
	/// performed.
	///
	/// # Errors
	///
	/// Any errors encountered during resolution will be returned as an `Err`.
	#[stable(feature = "rust1", since = "1.0.0")]
	fn to_socket_addrs(&self) -> io::Result<Self::Iter>;
	}

	#[stable(feature = "rust1", since = "1.0.0")]
	impl ToSocketAddrs for SocketAddr {
	type Iter = option::IntoIter<SocketAddr>;
	fn to_socket_addrs(&self) -> io::Result<option::IntoIter<SocketAddr>> {
	Ok(Some(*self).into_iter())
	}
	}

	#[stable(feature = "rust1", since = "1.0.0")]
	impl ToSocketAddrs for SocketAddrV4 {
	type Iter = option::IntoIter<SocketAddr>;
	fn to_socket_addrs(&self) -> io::Result<option::IntoIter<SocketAddr>> {
	SocketAddr::V4(*self).to_socket_addrs()
	}
	}

	#[stable(feature = "rust1", since = "1.0.0")]
	impl ToSocketAddrs for SocketAddrV6 {
	type Iter = option::IntoIter<SocketAddr>;
	fn to_socket_addrs(&self) -> io::Result<option::IntoIter<SocketAddr>> {
	SocketAddr::V6(*self).to_socket_addrs()
	}
	}

	#[stable(feature = "rust1", since = "1.0.0")]
	impl ToSocketAddrs for (IpAddr, u16) {
	type Iter = option::IntoIter<SocketAddr>;
	fn to_socket_addrs(&self) -> io::Result<option::IntoIter<SocketAddr>> {
	let (ip, port) = *self;
	match ip {
	IpAddr::V4(ref a) => (*a, port).to_socket_addrs(),
	IpAddr::V6(ref a) => (*a, port).to_socket_addrs(),
	}
	}
	}

	#[stable(feature = "rust1", since = "1.0.0")]
	impl ToSocketAddrs for (Ipv4Addr, u16) {
	type Iter = option::IntoIter<SocketAddr>;
	fn to_socket_addrs(&self) -> io::Result<option::IntoIter<SocketAddr>> {
	let (ip, port) = *self;
	SocketAddrV4::new(ip, port).to_socket_addrs()
	}
	}

	#[stable(feature = "rust1", since = "1.0.0")]
	impl ToSocketAddrs for (Ipv6Addr, u16) {
	type Iter = option::IntoIter<SocketAddr>;
	fn to_socket_addrs(&self) -> io::Result<option::IntoIter<SocketAddr>> {
	let (ip, port) = *self;
	SocketAddrV6::new(ip, port, 0, 0).to_socket_addrs()
	}
	}

	fn resolve_socket_addr(s: &str, p: u16) -> io::Result<vec::IntoIter<SocketAddr>> {
	let ips = lookup_host(s)?;
	let v: Vec<_> = ips.map(\|mut a\| { a.set_port(p); a }).collect();
	Ok(v.into_iter())
	}

	#[stable(feature = "rust1", since = "1.0.0")]
	impl<'a> ToSocketAddrs for (&'a str, u16) {
	type Iter = vec::IntoIter<SocketAddr>;
	fn to_socket_addrs(&self) -> io::Result<vec::IntoIter<SocketAddr>> {
	let (host, port) = *self;

	// try to parse the host as a regular IP address first
	if let Ok(addr) = host.parse::<Ipv4Addr>() {
	let addr = SocketAddrV4::new(addr, port);
	return Ok(vec![SocketAddr::V4(addr)].into_iter())
	}
	if let Ok(addr) = host.parse::<Ipv6Addr>() {
	let addr = SocketAddrV6::new(addr, port, 0, 0);
	return Ok(vec![SocketAddr::V6(addr)].into_iter())
	}

	resolve_socket_addr(host, port)
	}
	}

	// accepts strings like 'localhost:12345'
	#[stable(feature = "rust1", since = "1.0.0")]
	impl ToSocketAddrs for str {
	type Iter = vec::IntoIter<SocketAddr>;
	fn to_socket_addrs(&self) -> io::Result<vec::IntoIter<SocketAddr>> {
	// try to parse as a regular SocketAddr first
	if let Some(addr) = self.parse().ok() {
	return Ok(vec![addr].into_iter());
	}

	macro_rules! try_opt {
	($e:expr, $msg:expr) => (
	match $e {
	Some(r) => r,
	None => return Err(io::Error::new(io::ErrorKind::InvalidInput,
	$msg)),
	}
	)
	}

	// split the string by ':' and convert the second part to u16
	let mut parts_iter = self.rsplitn(2, ':');
	let port_str = try_opt!(parts_iter.next(), "invalid socket address");
	let host = try_opt!(parts_iter.next(), "invalid socket address");
	let port: u16 = try_opt!(port_str.parse().ok(), "invalid port value");
	resolve_socket_addr(host, port)
	}
	}

	#[stable(feature = "slice_to_socket_addrs", since = "1.8.0")]
	impl<'a> ToSocketAddrs for &'a [SocketAddr] {
	type Iter = iter::Cloned<slice::Iter<'a, SocketAddr>>;

	fn to_socket_addrs(&self) -> io::Result<Self::Iter> {
	Ok(self.iter().cloned())
	}
	}

	#[stable(feature = "rust1", since = "1.0.0")]
	impl<'a, T: ToSocketAddrs + ?Sized> ToSocketAddrs for &'a T {
	type Iter = T::Iter;
	fn to_socket_addrs(&self) -> io::Result<T::Iter> {
	(**self).to_socket_addrs()
	}
	}

	#[cfg(test)]
	mod tests {
	use prelude::v1::*;
	use net::*;
	use net::test::{tsa, sa6, sa4};

	#[test]
	fn to_socket_addr_ipaddr_u16() {
	let a = Ipv4Addr::new(77, 88, 21, 11);
	let p = 12345;
	let e = SocketAddr::V4(SocketAddrV4::new(a, p));
	assert_eq!(Ok(vec![e]), tsa((a, p)));
	}

	#[test]
	fn to_socket_addr_str_u16() {
	let a = sa4(Ipv4Addr::new(77, 88, 21, 11), 24352);
	assert_eq!(Ok(vec![a]), tsa(("77.88.21.11", 24352)));

	let a = sa6(Ipv6Addr::new(0x2a02, 0x6b8, 0, 1, 0, 0, 0, 1), 53);
	assert_eq!(Ok(vec![a]), tsa(("2a02:6b8:0:1::1", 53)));

	let a = sa4(Ipv4Addr::new(127, 0, 0, 1), 23924);
	assert!(tsa(("localhost", 23924)).unwrap().contains(&a));
	}

	#[test]
	fn to_socket_addr_str() {
	let a = sa4(Ipv4Addr::new(77, 88, 21, 11), 24352);
	assert_eq!(Ok(vec![a]), tsa("77.88.21.11:24352"));

	let a = sa6(Ipv6Addr::new(0x2a02, 0x6b8, 0, 1, 0, 0, 0, 1), 53);
	assert_eq!(Ok(vec![a]), tsa("[2a02:6b8:0:1::1]:53"));

	let a = sa4(Ipv4Addr::new(127, 0, 0, 1), 23924);
	assert!(tsa("localhost:23924").unwrap().contains(&a));
	}

	// FIXME: figure out why this fails on openbsd and bitrig and fix it
	#[test]
	#[cfg(not(any(windows, target_os = "openbsd", target_os = "bitrig")))]
	fn to_socket_addr_str_bad() {
	assert!(tsa("1200::AB00:1234::2552:7777:1313:34300").is_err());
	}

	#[test]
	fn set_ip() {
	fn ip4(low: u8) -> Ipv4Addr { Ipv4Addr::new(77, 88, 21, low) }
	fn ip6(low: u16) -> Ipv6Addr { Ipv6Addr::new(0x2a02, 0x6b8, 0, 1, 0, 0, 0, low) }

	let mut v4 = SocketAddrV4::new(ip4(11), 80);
	assert_eq!(v4.ip(), &ip4(11));
	v4.set_ip(ip4(12));
	assert_eq!(v4.ip(), &ip4(12));

	let mut addr = SocketAddr::V4(v4);
	assert_eq!(addr.ip(), IpAddr::V4(ip4(12)));
	addr.set_ip(IpAddr::V4(ip4(13)));
	assert_eq!(addr.ip(), IpAddr::V4(ip4(13)));
	addr.set_ip(IpAddr::V6(ip6(14)));
	assert_eq!(addr.ip(), IpAddr::V6(ip6(14)));

	let mut v6 = SocketAddrV6::new(ip6(1), 80, 0, 0);
	assert_eq!(v6.ip(), &ip6(1));
	v6.set_ip(ip6(2));
	assert_eq!(v6.ip(), &ip6(2));

	let mut addr = SocketAddr::V6(v6);
	assert_eq!(addr.ip(), IpAddr::V6(ip6(2)));
	addr.set_ip(IpAddr::V6(ip6(3)));
	assert_eq!(addr.ip(), IpAddr::V6(ip6(3)));
	addr.set_ip(IpAddr::V4(ip4(4)));
	assert_eq!(addr.ip(), IpAddr::V4(ip4(4)));
	}

	#[test]
	fn set_port() {
	let mut v4 = SocketAddrV4::new(Ipv4Addr::new(77, 88, 21, 11), 80);
	assert_eq!(v4.port(), 80);
	v4.set_port(443);
	assert_eq!(v4.port(), 443);

	let mut addr = SocketAddr::V4(v4);
	assert_eq!(addr.port(), 443);
	addr.set_port(8080);
	assert_eq!(addr.port(), 8080);

	let mut v6 = SocketAddrV6::new(Ipv6Addr::new(0x2a02, 0x6b8, 0, 1, 0, 0, 0, 1), 80, 0, 0);
	assert_eq!(v6.port(), 80);
	v6.set_port(443);
	assert_eq!(v6.port(), 443);

	let mut addr = SocketAddr::V6(v6);
	assert_eq!(addr.port(), 443);
	addr.set_port(8080);
	assert_eq!(addr.port(), 8080);
	}

	#[test]
	fn set_flowinfo() {
	let mut v6 = SocketAddrV6::new(Ipv6Addr::new(0x2a02, 0x6b8, 0, 1, 0, 0, 0, 1), 80, 10, 0);
	assert_eq!(v6.flowinfo(), 10);
	v6.set_flowinfo(20);
	assert_eq!(v6.flowinfo(), 20);
	}

	#[test]
	fn set_scope_id() {
	let mut v6 = SocketAddrV6::new(Ipv6Addr::new(0x2a02, 0x6b8, 0, 1, 0, 0, 0, 1), 80, 0, 10);
	assert_eq!(v6.scope_id(), 10);
	v6.set_scope_id(20);
	assert_eq!(v6.scope_id(), 20);
	}
	}