vendor/socket2-0.4.4/src/sockaddr.rs - toolchain/rustc - Git at Google

 use std::mem::{self, size_of, MaybeUninit};
 use std::net::{SocketAddr, SocketAddrV4, SocketAddrV6};
 use std::{fmt, io};

 use crate::sys::{
     sa_family_t, sockaddr, sockaddr_in, sockaddr_in6, sockaddr_storage, socklen_t, AF_INET,
     AF_INET6,
 };
 #[cfg(windows)]
 use winapi::shared::ws2ipdef::SOCKADDR_IN6_LH_u;

 /// The address of a socket.
 ///
 /// `SockAddr`s may be constructed directly to and from the standard library
 /// [`SocketAddr`], [`SocketAddrV4`], and [`SocketAddrV6`] types.
 pub struct SockAddr {
     storage: sockaddr_storage,
     len: socklen_t,
 }

 #[allow(clippy::len_without_is_empty)]
 impl SockAddr {
     /// Create a `SockAddr` from the underlying storage and its length.
     ///
     /// # Safety
     ///
     /// Caller must ensure that the address family and length match the type of
     /// storage address. For example if `storage.ss_family` is set to `AF_INET`
     /// the `storage` must be initialised as `sockaddr_in`, setting the content
     /// and length appropriately.
     ///
     /// # Examples
     ///
     /// ```
     /// # fn main() -> std::io::Result<()> {
     /// # #[cfg(unix)] {
     /// use std::io;
     /// use std::mem;
     /// use std::os::unix::io::AsRawFd;
     ///
     /// use socket2::{SockAddr, Socket, Domain, Type};
     ///
     /// let socket = Socket::new(Domain::IPV4, Type::STREAM, None)?;
     ///
     /// // Initialise a `SocketAddr` byte calling `getsockname(2)`.
     /// let mut addr_storage: libc::sockaddr_storage = unsafe { mem::zeroed() };
     /// let mut len = mem::size_of_val(&addr_storage) as libc::socklen_t;
     ///
     /// // The `getsockname(2)` system call will intiliase `storage` for
     /// // us, setting `len` to the correct length.
     /// let res = unsafe {
     ///     libc::getsockname(
     ///         socket.as_raw_fd(),
     ///         (&mut addr_storage as *mut libc::sockaddr_storage).cast(),
     ///         &mut len,
     ///     )
     /// };
     /// if res == -1 {
     ///     return Err(io::Error::last_os_error());
     /// }
     ///
     /// let address = unsafe { SockAddr::new(addr_storage, len) };
     /// # drop(address);
     /// # }
     /// # Ok(())
     /// # }
     /// ```
     pub const unsafe fn new(storage: sockaddr_storage, len: socklen_t) -> SockAddr {
         SockAddr { storage, len }
     }

     /// Initialise a `SockAddr` by calling the function `init`.
     ///
     /// The type of the address storage and length passed to the function `init`
     /// is OS/architecture specific.
     ///
     /// The address is zeroed before `init` is called and is thus valid to
     /// dereference and read from. The length initialised to the maximum length
     /// of the storage.
     ///
     /// # Safety
     ///
     /// Caller must ensure that the address family and length match the type of
     /// storage address. For example if `storage.ss_family` is set to `AF_INET`
     /// the `storage` must be initialised as `sockaddr_in`, setting the content
     /// and length appropriately.
     ///
     /// # Examples
     ///
     /// ```
     /// # fn main() -> std::io::Result<()> {
     /// # #[cfg(unix)] {
     /// use std::io;
     /// use std::os::unix::io::AsRawFd;
     ///
     /// use socket2::{SockAddr, Socket, Domain, Type};
     ///
     /// let socket = Socket::new(Domain::IPV4, Type::STREAM, None)?;
     ///
     /// // Initialise a `SocketAddr` byte calling `getsockname(2)`.
     /// let (_, address) = unsafe {
     ///     SockAddr::init(|addr_storage, len| {
     ///         // The `getsockname(2)` system call will intiliase `storage` for
     ///         // us, setting `len` to the correct length.
     ///         if libc::getsockname(socket.as_raw_fd(), addr_storage.cast(), len) == -1 {
     ///             Err(io::Error::last_os_error())
     ///         } else {
     ///             Ok(())
     ///         }
     ///     })
     /// }?;
     /// # drop(address);
     /// # }
     /// # Ok(())
     /// # }
     /// ```
     pub unsafe fn init<F, T>(init: F) -> io::Result<(T, SockAddr)>
     where
         F: FnOnce(*mut sockaddr_storage, *mut socklen_t) -> io::Result<T>,
     {
         const STORAGE_SIZE: socklen_t = size_of::<sockaddr_storage>() as socklen_t;
         // NOTE: `SockAddr::unix` depends on the storage being zeroed before
         // calling `init`.
         // NOTE: calling `recvfrom` with an empty buffer also depends on the
         // storage being zeroed before calling `init` as the OS might not
         // initialise it.
         let mut storage = MaybeUninit::<sockaddr_storage>::zeroed();
         let mut len = STORAGE_SIZE;
         init(storage.as_mut_ptr(), &mut len).map(|res| {
             debug_assert!(len <= STORAGE_SIZE, "overflown address storage");
             let addr = SockAddr {
                 // Safety: zeroed-out `sockaddr_storage` is valid, caller must
                 // ensure at least `len` bytes are valid.
                 storage: storage.assume_init(),
                 len,
             };
             (res, addr)
         })
     }

     /// Returns this address's family.
     pub const fn family(&self) -> sa_family_t {
         self.storage.ss_family
     }

     /// Returns the size of this address in bytes.
     pub const fn len(&self) -> socklen_t {
         self.len
     }

     /// Returns a raw pointer to the address.
     pub const fn as_ptr(&self) -> *const sockaddr {
         &self.storage as *const _ as *const _
     }

     /// Returns a raw pointer to the address storage.
     #[cfg(all(unix, not(target_os = "redox")))]
     pub(crate) const fn as_storage_ptr(&self) -> *const sockaddr_storage {
         &self.storage
     }

     /// Returns this address as a `SocketAddr` if it is in the `AF_INET` (IPv4)
     /// or `AF_INET6` (IPv6) family, otherwise returns `None`.
     pub fn as_socket(&self) -> Option<SocketAddr> {
         if self.storage.ss_family == AF_INET as sa_family_t {
             // Safety: if the ss_family field is AF_INET then storage must be a sockaddr_in.
             let addr = unsafe { &*(&self.storage as *const _ as *const sockaddr_in) };

             let ip = crate::sys::from_in_addr(addr.sin_addr);
             let port = u16::from_be(addr.sin_port);
             Some(SocketAddr::V4(SocketAddrV4::new(ip, port)))
         } else if self.storage.ss_family == AF_INET6 as sa_family_t {
             // Safety: if the ss_family field is AF_INET6 then storage must be a sockaddr_in6.
             let addr = unsafe { &*(&self.storage as *const _ as *const sockaddr_in6) };

             let ip = crate::sys::from_in6_addr(addr.sin6_addr);
             let port = u16::from_be(addr.sin6_port);
             Some(SocketAddr::V6(SocketAddrV6::new(
                 ip,
                 port,
                 addr.sin6_flowinfo,
                 #[cfg(unix)]
                 addr.sin6_scope_id,
                 #[cfg(windows)]
                 unsafe {
                     *addr.u.sin6_scope_id()
                 },
             )))
         } else {
             None
         }
     }

     /// Returns this address as a [`SocketAddrV4`] if it is in the `AF_INET`
     /// family.
     pub fn as_socket_ipv4(&self) -> Option<SocketAddrV4> {
         match self.as_socket() {
             Some(SocketAddr::V4(addr)) => Some(addr),
             _ => None,
         }
     }

     /// Returns this address as a [`SocketAddrV6`] if it is in the `AF_INET6`
     /// family.
     pub fn as_socket_ipv6(&self) -> Option<SocketAddrV6> {
         match self.as_socket() {
             Some(SocketAddr::V6(addr)) => Some(addr),
             _ => None,
         }
     }
 }

 impl From<SocketAddr> for SockAddr {
     fn from(addr: SocketAddr) -> SockAddr {
         match addr {
             SocketAddr::V4(addr) => addr.into(),
             SocketAddr::V6(addr) => addr.into(),
         }
     }
 }

 impl From<SocketAddrV4> for SockAddr {
     fn from(addr: SocketAddrV4) -> SockAddr {
         let sockaddr_in = sockaddr_in {
             sin_family: AF_INET as sa_family_t,
             sin_port: addr.port().to_be(),
             sin_addr: crate::sys::to_in_addr(addr.ip()),
             sin_zero: Default::default(),
             #[cfg(any(
                 target_os = "dragonfly",
                 target_os = "freebsd",
                 target_os = "haiku",
                 target_os = "ios",
                 target_os = "macos",
                 target_os = "netbsd",
                 target_os = "openbsd"
             ))]
             sin_len: 0,
         };
         let mut storage = MaybeUninit::<sockaddr_storage>::zeroed();
         // Safety: A `sockaddr_in` is memory compatible with a `sockaddr_storage`
         unsafe { (storage.as_mut_ptr() as *mut sockaddr_in).write(sockaddr_in) };
         SockAddr {
             storage: unsafe { storage.assume_init() },
             len: mem::size_of::<sockaddr_in>() as socklen_t,
         }
     }
 }

 impl From<SocketAddrV6> for SockAddr {
     fn from(addr: SocketAddrV6) -> SockAddr {
         #[cfg(windows)]
         let u = unsafe {
             let mut u = mem::zeroed::<SOCKADDR_IN6_LH_u>();
             *u.sin6_scope_id_mut() = addr.scope_id();
             u
         };

         let sockaddr_in6 = sockaddr_in6 {
             sin6_family: AF_INET6 as sa_family_t,
             sin6_port: addr.port().to_be(),
             sin6_addr: crate::sys::to_in6_addr(addr.ip()),
             sin6_flowinfo: addr.flowinfo(),
             #[cfg(unix)]
             sin6_scope_id: addr.scope_id(),
             #[cfg(windows)]
             u,
             #[cfg(any(
                 target_os = "dragonfly",
                 target_os = "freebsd",
                 target_os = "haiku",
                 target_os = "ios",
                 target_os = "macos",
                 target_os = "netbsd",
                 target_os = "openbsd"
             ))]
             sin6_len: 0,
             #[cfg(any(target_os = "solaris", target_os = "illumos"))]
             __sin6_src_id: 0,
         };
         let mut storage = MaybeUninit::<sockaddr_storage>::zeroed();
         // Safety: A `sockaddr_in6` is memory compatible with a `sockaddr_storage`
         unsafe { (storage.as_mut_ptr() as *mut sockaddr_in6).write(sockaddr_in6) };
         SockAddr {
             storage: unsafe { storage.assume_init() },
             len: mem::size_of::<sockaddr_in6>() as socklen_t,
         }
     }
 }

 impl fmt::Debug for SockAddr {
     fn fmt(&self, fmt: &mut fmt::Formatter<'_>) -> fmt::Result {
         let mut f = fmt.debug_struct("SockAddr");
         #[cfg(any(
             target_os = "dragonfly",
             target_os = "freebsd",
             target_os = "haiku",
             target_os = "hermit",
             target_os = "ios",
             target_os = "macos",
             target_os = "netbsd",
             target_os = "openbsd",
             target_os = "vxworks",
         ))]
         f.field("ss_len", &self.storage.ss_len);
         f.field("ss_family", &self.storage.ss_family)
             .field("len", &self.len)
             .finish()
     }
 }

 #[test]
 fn ipv4() {
     use std::net::Ipv4Addr;
     let std = SocketAddrV4::new(Ipv4Addr::new(1, 2, 3, 4), 9876);
     let addr = SockAddr::from(std);
     assert_eq!(addr.family(), AF_INET as sa_family_t);
     assert_eq!(addr.len(), size_of::<sockaddr_in>() as socklen_t);
     assert_eq!(addr.as_socket(), Some(SocketAddr::V4(std)));
     assert_eq!(addr.as_socket_ipv4(), Some(std));
     assert!(addr.as_socket_ipv6().is_none());

     let addr = SockAddr::from(SocketAddr::from(std));
     assert_eq!(addr.family(), AF_INET as sa_family_t);
     assert_eq!(addr.len(), size_of::<sockaddr_in>() as socklen_t);
     assert_eq!(addr.as_socket(), Some(SocketAddr::V4(std)));
     assert_eq!(addr.as_socket_ipv4(), Some(std));
     assert!(addr.as_socket_ipv6().is_none());
 }

 #[test]
 fn ipv6() {
     use std::net::Ipv6Addr;
     let std = SocketAddrV6::new(Ipv6Addr::new(1, 2, 3, 4, 5, 6, 7, 8), 9876, 11, 12);
     let addr = SockAddr::from(std);
     assert_eq!(addr.family(), AF_INET6 as sa_family_t);
     assert_eq!(addr.len(), size_of::<sockaddr_in6>() as socklen_t);
     assert_eq!(addr.as_socket(), Some(SocketAddr::V6(std)));
     assert!(addr.as_socket_ipv4().is_none());
     assert_eq!(addr.as_socket_ipv6(), Some(std));

     let addr = SockAddr::from(SocketAddr::from(std));
     assert_eq!(addr.family(), AF_INET6 as sa_family_t);
     assert_eq!(addr.len(), size_of::<sockaddr_in6>() as socklen_t);
     assert_eq!(addr.as_socket(), Some(SocketAddr::V6(std)));
     assert!(addr.as_socket_ipv4().is_none());
     assert_eq!(addr.as_socket_ipv6(), Some(std));
 }
	use std::mem::{self, size_of, MaybeUninit};
	use std::net::{SocketAddr, SocketAddrV4, SocketAddrV6};
	use std::{fmt, io};

	use crate::sys::{
	sa_family_t, sockaddr, sockaddr_in, sockaddr_in6, sockaddr_storage, socklen_t, AF_INET,
	AF_INET6,
	};
	#[cfg(windows)]
	use winapi::shared::ws2ipdef::SOCKADDR_IN6_LH_u;

	/// The address of a socket.
	///
	/// `SockAddr`s may be constructed directly to and from the standard library
	/// [`SocketAddr`], [`SocketAddrV4`], and [`SocketAddrV6`] types.
	pub struct SockAddr {
	storage: sockaddr_storage,
	len: socklen_t,
	}

	#[allow(clippy::len_without_is_empty)]
	impl SockAddr {
	/// Create a `SockAddr` from the underlying storage and its length.
	///
	/// # Safety
	///
	/// Caller must ensure that the address family and length match the type of
	/// storage address. For example if `storage.ss_family` is set to `AF_INET`
	/// the `storage` must be initialised as `sockaddr_in`, setting the content
	/// and length appropriately.
	///
	/// # Examples
	///
	/// ```
	/// # fn main() -> std::io::Result<()> {
	/// # #[cfg(unix)] {
	/// use std::io;
	/// use std::mem;
	/// use std::os::unix::io::AsRawFd;
	///
	/// use socket2::{SockAddr, Socket, Domain, Type};
	///
	/// let socket = Socket::new(Domain::IPV4, Type::STREAM, None)?;
	///
	/// // Initialise a `SocketAddr` byte calling `getsockname(2)`.
	/// let mut addr_storage: libc::sockaddr_storage = unsafe { mem::zeroed() };
	/// let mut len = mem::size_of_val(&addr_storage) as libc::socklen_t;
	///
	/// // The `getsockname(2)` system call will intiliase `storage` for
	/// // us, setting `len` to the correct length.
	/// let res = unsafe {
	/// libc::getsockname(
	/// socket.as_raw_fd(),
	/// (&mut addr_storage as *mut libc::sockaddr_storage).cast(),
	/// &mut len,
	/// )
	/// };
	/// if res == -1 {
	/// return Err(io::Error::last_os_error());
	/// }
	///
	/// let address = unsafe { SockAddr::new(addr_storage, len) };
	/// # drop(address);
	/// # }
	/// # Ok(())
	/// # }
	/// ```
	pub const unsafe fn new(storage: sockaddr_storage, len: socklen_t) -> SockAddr {
	SockAddr { storage, len }
	}

	/// Initialise a `SockAddr` by calling the function `init`.
	///
	/// The type of the address storage and length passed to the function `init`
	/// is OS/architecture specific.
	///
	/// The address is zeroed before `init` is called and is thus valid to
	/// dereference and read from. The length initialised to the maximum length
	/// of the storage.
	///
	/// # Safety
	///
	/// Caller must ensure that the address family and length match the type of
	/// storage address. For example if `storage.ss_family` is set to `AF_INET`
	/// the `storage` must be initialised as `sockaddr_in`, setting the content
	/// and length appropriately.
	///
	/// # Examples
	///
	/// ```
	/// # fn main() -> std::io::Result<()> {
	/// # #[cfg(unix)] {
	/// use std::io;
	/// use std::os::unix::io::AsRawFd;
	///
	/// use socket2::{SockAddr, Socket, Domain, Type};
	///
	/// let socket = Socket::new(Domain::IPV4, Type::STREAM, None)?;
	///
	/// // Initialise a `SocketAddr` byte calling `getsockname(2)`.
	/// let (_, address) = unsafe {
	/// SockAddr::init(\|addr_storage, len\| {
	/// // The `getsockname(2)` system call will intiliase `storage` for
	/// // us, setting `len` to the correct length.
	/// if libc::getsockname(socket.as_raw_fd(), addr_storage.cast(), len) == -1 {
	/// Err(io::Error::last_os_error())
	/// } else {
	/// Ok(())
	/// }
	/// })
	/// }?;
	/// # drop(address);
	/// # }
	/// # Ok(())
	/// # }
	/// ```
	pub unsafe fn init<F, T>(init: F) -> io::Result<(T, SockAddr)>
	where
	F: FnOnce(mut sockaddr_storage, mut socklen_t) -> io::Result<T>,
	{
	const STORAGE_SIZE: socklen_t = size_of::<sockaddr_storage>() as socklen_t;
	// NOTE: `SockAddr::unix` depends on the storage being zeroed before
	// calling `init`.
	// NOTE: calling `recvfrom` with an empty buffer also depends on the
	// storage being zeroed before calling `init` as the OS might not
	// initialise it.
	let mut storage = MaybeUninit::<sockaddr_storage>::zeroed();
	let mut len = STORAGE_SIZE;
	init(storage.as_mut_ptr(), &mut len).map(\|res\| {
	debug_assert!(len <= STORAGE_SIZE, "overflown address storage");
	let addr = SockAddr {
	// Safety: zeroed-out `sockaddr_storage` is valid, caller must
	// ensure at least `len` bytes are valid.
	storage: storage.assume_init(),
	len,
	};
	(res, addr)
	})
	}

	/// Returns this address's family.
	pub const fn family(&self) -> sa_family_t {
	self.storage.ss_family
	}

	/// Returns the size of this address in bytes.
	pub const fn len(&self) -> socklen_t {
	self.len
	}

	/// Returns a raw pointer to the address.
	pub const fn as_ptr(&self) -> *const sockaddr {
	&self.storage as const _ as const _
	}

	/// Returns a raw pointer to the address storage.
	#[cfg(all(unix, not(target_os = "redox")))]
	pub(crate) const fn as_storage_ptr(&self) -> *const sockaddr_storage {
	&self.storage
	}

	/// Returns this address as a `SocketAddr` if it is in the `AF_INET` (IPv4)
	/// or `AF_INET6` (IPv6) family, otherwise returns `None`.
	pub fn as_socket(&self) -> Option<SocketAddr> {
	if self.storage.ss_family == AF_INET as sa_family_t {
	// Safety: if the ss_family field is AF_INET then storage must be a sockaddr_in.
	let addr = unsafe { &(&self.storage as const _ as *const sockaddr_in) };

	let ip = crate::sys::from_in_addr(addr.sin_addr);
	let port = u16::from_be(addr.sin_port);
	Some(SocketAddr::V4(SocketAddrV4::new(ip, port)))
	} else if self.storage.ss_family == AF_INET6 as sa_family_t {
	// Safety: if the ss_family field is AF_INET6 then storage must be a sockaddr_in6.
	let addr = unsafe { &(&self.storage as const _ as *const sockaddr_in6) };

	let ip = crate::sys::from_in6_addr(addr.sin6_addr);
	let port = u16::from_be(addr.sin6_port);
	Some(SocketAddr::V6(SocketAddrV6::new(
	ip,
	port,
	addr.sin6_flowinfo,
	#[cfg(unix)]
	addr.sin6_scope_id,
	#[cfg(windows)]
	unsafe {
	*addr.u.sin6_scope_id()
	},
	)))
	} else {
	None
	}
	}

	/// Returns this address as a [`SocketAddrV4`] if it is in the `AF_INET`
	/// family.
	pub fn as_socket_ipv4(&self) -> Option<SocketAddrV4> {
	match self.as_socket() {
	Some(SocketAddr::V4(addr)) => Some(addr),
	_ => None,
	}
	}

	/// Returns this address as a [`SocketAddrV6`] if it is in the `AF_INET6`
	/// family.
	pub fn as_socket_ipv6(&self) -> Option<SocketAddrV6> {
	match self.as_socket() {
	Some(SocketAddr::V6(addr)) => Some(addr),
	_ => None,
	}
	}
	}

	impl From<SocketAddr> for SockAddr {
	fn from(addr: SocketAddr) -> SockAddr {
	match addr {
	SocketAddr::V4(addr) => addr.into(),
	SocketAddr::V6(addr) => addr.into(),
	}
	}
	}

	impl From<SocketAddrV4> for SockAddr {
	fn from(addr: SocketAddrV4) -> SockAddr {
	let sockaddr_in = sockaddr_in {
	sin_family: AF_INET as sa_family_t,
	sin_port: addr.port().to_be(),
	sin_addr: crate::sys::to_in_addr(addr.ip()),
	sin_zero: Default::default(),
	#[cfg(any(
	target_os = "dragonfly",
	target_os = "freebsd",
	target_os = "haiku",
	target_os = "ios",
	target_os = "macos",
	target_os = "netbsd",
	target_os = "openbsd"
	))]
	sin_len: 0,
	};
	let mut storage = MaybeUninit::<sockaddr_storage>::zeroed();
	// Safety: A `sockaddr_in` is memory compatible with a `sockaddr_storage`
	unsafe { (storage.as_mut_ptr() as *mut sockaddr_in).write(sockaddr_in) };
	SockAddr {
	storage: unsafe { storage.assume_init() },
	len: mem::size_of::<sockaddr_in>() as socklen_t,
	}
	}
	}

	impl From<SocketAddrV6> for SockAddr {
	fn from(addr: SocketAddrV6) -> SockAddr {
	#[cfg(windows)]
	let u = unsafe {
	let mut u = mem::zeroed::<SOCKADDR_IN6_LH_u>();
	*u.sin6_scope_id_mut() = addr.scope_id();
	u
	};

	let sockaddr_in6 = sockaddr_in6 {
	sin6_family: AF_INET6 as sa_family_t,
	sin6_port: addr.port().to_be(),
	sin6_addr: crate::sys::to_in6_addr(addr.ip()),
	sin6_flowinfo: addr.flowinfo(),
	#[cfg(unix)]
	sin6_scope_id: addr.scope_id(),
	#[cfg(windows)]
	u,
	#[cfg(any(
	target_os = "dragonfly",
	target_os = "freebsd",
	target_os = "haiku",
	target_os = "ios",
	target_os = "macos",
	target_os = "netbsd",
	target_os = "openbsd"
	))]
	sin6_len: 0,
	#[cfg(any(target_os = "solaris", target_os = "illumos"))]
	__sin6_src_id: 0,
	};
	let mut storage = MaybeUninit::<sockaddr_storage>::zeroed();
	// Safety: A `sockaddr_in6` is memory compatible with a `sockaddr_storage`
	unsafe { (storage.as_mut_ptr() as *mut sockaddr_in6).write(sockaddr_in6) };
	SockAddr {
	storage: unsafe { storage.assume_init() },
	len: mem::size_of::<sockaddr_in6>() as socklen_t,
	}
	}
	}

	impl fmt::Debug for SockAddr {
	fn fmt(&self, fmt: &mut fmt::Formatter<'_>) -> fmt::Result {
	let mut f = fmt.debug_struct("SockAddr");
	#[cfg(any(
	target_os = "dragonfly",
	target_os = "freebsd",
	target_os = "haiku",
	target_os = "hermit",
	target_os = "ios",
	target_os = "macos",
	target_os = "netbsd",
	target_os = "openbsd",
	target_os = "vxworks",
	))]
	f.field("ss_len", &self.storage.ss_len);
	f.field("ss_family", &self.storage.ss_family)
	.field("len", &self.len)
	.finish()
	}
	}

	#[test]
	fn ipv4() {
	use std::net::Ipv4Addr;
	let std = SocketAddrV4::new(Ipv4Addr::new(1, 2, 3, 4), 9876);
	let addr = SockAddr::from(std);
	assert_eq!(addr.family(), AF_INET as sa_family_t);
	assert_eq!(addr.len(), size_of::<sockaddr_in>() as socklen_t);
	assert_eq!(addr.as_socket(), Some(SocketAddr::V4(std)));
	assert_eq!(addr.as_socket_ipv4(), Some(std));
	assert!(addr.as_socket_ipv6().is_none());

	let addr = SockAddr::from(SocketAddr::from(std));
	assert_eq!(addr.family(), AF_INET as sa_family_t);
	assert_eq!(addr.len(), size_of::<sockaddr_in>() as socklen_t);
	assert_eq!(addr.as_socket(), Some(SocketAddr::V4(std)));
	assert_eq!(addr.as_socket_ipv4(), Some(std));
	assert!(addr.as_socket_ipv6().is_none());
	}

	#[test]
	fn ipv6() {
	use std::net::Ipv6Addr;
	let std = SocketAddrV6::new(Ipv6Addr::new(1, 2, 3, 4, 5, 6, 7, 8), 9876, 11, 12);
	let addr = SockAddr::from(std);
	assert_eq!(addr.family(), AF_INET6 as sa_family_t);
	assert_eq!(addr.len(), size_of::<sockaddr_in6>() as socklen_t);
	assert_eq!(addr.as_socket(), Some(SocketAddr::V6(std)));
	assert!(addr.as_socket_ipv4().is_none());
	assert_eq!(addr.as_socket_ipv6(), Some(std));

	let addr = SockAddr::from(SocketAddr::from(std));
	assert_eq!(addr.family(), AF_INET6 as sa_family_t);
	assert_eq!(addr.len(), size_of::<sockaddr_in6>() as socklen_t);
	assert_eq!(addr.as_socket(), Some(SocketAddr::V6(std)));
	assert!(addr.as_socket_ipv4().is_none());
	assert_eq!(addr.as_socket_ipv6(), Some(std));
	}