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 </pre><pre class="rust"><code><span class="kw">use </span>std::mem::{<span class="self">self</span>, size_of, MaybeUninit};
 <span class="kw">use </span>std::net::{SocketAddr, SocketAddrV4, SocketAddrV6};
 <span class="kw">use </span>std::{fmt, io};

 <span class="kw">use </span><span class="kw">crate</span>::sys::{
     sa_family_t, sockaddr, sockaddr_in, sockaddr_in6, sockaddr_storage, socklen_t, AF_INET,
     AF_INET6,
 };
 <span class="attribute">#[cfg(windows)]
 </span><span class="kw">use </span>winapi::shared::ws2ipdef::SOCKADDR_IN6_LH_u;

 <span class="doccomment">/// The address of a socket.
 ///
 /// `SockAddr`s may be constructed directly to and from the standard library
 /// [`SocketAddr`], [`SocketAddrV4`], and [`SocketAddrV6`] types.
 </span><span class="attribute">#[derive(Clone)]
 </span><span class="kw">pub struct </span>SockAddr {
     storage: sockaddr_storage,
     len: socklen_t,
 }

 <span class="attribute">#[allow(clippy::len_without_is_empty)]
 </span><span class="kw">impl </span>SockAddr {
     <span class="doccomment">/// 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() -&gt; std::io::Result&lt;()&gt; {
     /// # #[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(&amp;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(),
     ///         (&amp;mut addr_storage as *mut libc::sockaddr_storage).cast(),
     ///         &amp;mut len,
     ///     )
     /// };
     /// if res == -1 {
     ///     return Err(io::Error::last_os_error());
     /// }
     ///
     /// let address = unsafe { SockAddr::new(addr_storage, len) };
     /// # drop(address);
     /// # }
     /// # Ok(())
     /// # }
     /// ```
     </span><span class="kw">pub const unsafe fn </span>new(storage: sockaddr_storage, len: socklen_t) -&gt; SockAddr {
         SockAddr { storage, len }
     }

     <span class="doccomment">/// 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() -&gt; std::io::Result&lt;()&gt; {
     /// # #[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(())
     /// # }
     /// ```
     </span><span class="kw">pub unsafe fn </span>init&lt;F, T&gt;(init: F) -&gt; io::Result&lt;(T, SockAddr)&gt;
     <span class="kw">where
         </span>F: FnOnce(<span class="kw-2">*mut </span>sockaddr_storage, <span class="kw-2">*mut </span>socklen_t) -&gt; io::Result&lt;T&gt;,
     {
         <span class="kw">const </span>STORAGE_SIZE: socklen_t = size_of::&lt;sockaddr_storage&gt;() <span class="kw">as </span>socklen_t;
         <span class="comment">// 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.
         </span><span class="kw">let </span><span class="kw-2">mut </span>storage = MaybeUninit::&lt;sockaddr_storage&gt;::zeroed();
         <span class="kw">let </span><span class="kw-2">mut </span>len = STORAGE_SIZE;
         init(storage.as_mut_ptr(), <span class="kw-2">&amp;mut </span>len).map(|res| {
             <span class="macro">debug_assert!</span>(len &lt;= STORAGE_SIZE, <span class="string">&quot;overflown address storage&quot;</span>);
             <span class="kw">let </span>addr = SockAddr {
                 <span class="comment">// Safety: zeroed-out `sockaddr_storage` is valid, caller must
                 // ensure at least `len` bytes are valid.
                 </span>storage: storage.assume_init(),
                 len,
             };
             (res, addr)
         })
     }

     <span class="doccomment">/// Returns this address&#39;s family.
     </span><span class="kw">pub const fn </span>family(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; sa_family_t {
         <span class="self">self</span>.storage.ss_family
     }

     <span class="doccomment">/// Returns the size of this address in bytes.
     </span><span class="kw">pub const fn </span>len(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; socklen_t {
         <span class="self">self</span>.len
     }

     <span class="doccomment">/// Returns a raw pointer to the address.
     </span><span class="kw">pub const fn </span>as_ptr(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; <span class="kw-2">*const </span>sockaddr {
         <span class="kw-2">&amp;</span><span class="self">self</span>.storage <span class="kw">as </span><span class="kw-2">*const </span><span class="kw">_ as </span><span class="kw-2">*const </span><span class="kw">_
     </span>}

     <span class="doccomment">/// Returns a raw pointer to the address storage.
     </span><span class="attribute">#[cfg(all(unix, not(target_os = <span class="string">&quot;redox&quot;</span>)))]
     </span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">const fn </span>as_storage_ptr(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; <span class="kw-2">*const </span>sockaddr_storage {
         <span class="kw-2">&amp;</span><span class="self">self</span>.storage
     }

     <span class="doccomment">/// Returns this address as a `SocketAddr` if it is in the `AF_INET` (IPv4)
     /// or `AF_INET6` (IPv6) family, otherwise returns `None`.
     </span><span class="kw">pub fn </span>as_socket(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; <span class="prelude-ty">Option</span>&lt;SocketAddr&gt; {
         <span class="kw">if </span><span class="self">self</span>.storage.ss_family == AF_INET <span class="kw">as </span>sa_family_t {
             <span class="comment">// Safety: if the ss_family field is AF_INET then storage must be a sockaddr_in.
             </span><span class="kw">let </span>addr = <span class="kw">unsafe </span>{ <span class="kw-2">&amp;*</span>(<span class="kw-2">&amp;</span><span class="self">self</span>.storage <span class="kw">as </span><span class="kw-2">*const </span><span class="kw">_ as </span><span class="kw-2">*const </span>sockaddr_in) };

             <span class="kw">let </span>ip = <span class="kw">crate</span>::sys::from_in_addr(addr.sin_addr);
             <span class="kw">let </span>port = u16::from_be(addr.sin_port);
             <span class="prelude-val">Some</span>(SocketAddr::V4(SocketAddrV4::new(ip, port)))
         } <span class="kw">else if </span><span class="self">self</span>.storage.ss_family == AF_INET6 <span class="kw">as </span>sa_family_t {
             <span class="comment">// Safety: if the ss_family field is AF_INET6 then storage must be a sockaddr_in6.
             </span><span class="kw">let </span>addr = <span class="kw">unsafe </span>{ <span class="kw-2">&amp;*</span>(<span class="kw-2">&amp;</span><span class="self">self</span>.storage <span class="kw">as </span><span class="kw-2">*const </span><span class="kw">_ as </span><span class="kw-2">*const </span>sockaddr_in6) };

             <span class="kw">let </span>ip = <span class="kw">crate</span>::sys::from_in6_addr(addr.sin6_addr);
             <span class="kw">let </span>port = u16::from_be(addr.sin6_port);
             <span class="prelude-val">Some</span>(SocketAddr::V6(SocketAddrV6::new(
                 ip,
                 port,
                 addr.sin6_flowinfo,
                 <span class="attribute">#[cfg(unix)]
                 </span>addr.sin6_scope_id,
                 <span class="attribute">#[cfg(windows)]
                 </span><span class="kw">unsafe </span>{
                     <span class="kw-2">*</span>addr.u.sin6_scope_id()
                 },
             )))
         } <span class="kw">else </span>{
             <span class="prelude-val">None
         </span>}
     }

     <span class="doccomment">/// Returns this address as a [`SocketAddrV4`] if it is in the `AF_INET`
     /// family.
     </span><span class="kw">pub fn </span>as_socket_ipv4(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; <span class="prelude-ty">Option</span>&lt;SocketAddrV4&gt; {
         <span class="kw">match </span><span class="self">self</span>.as_socket() {
             <span class="prelude-val">Some</span>(SocketAddr::V4(addr)) =&gt; <span class="prelude-val">Some</span>(addr),
             <span class="kw">_ </span>=&gt; <span class="prelude-val">None</span>,
         }
     }

     <span class="doccomment">/// Returns this address as a [`SocketAddrV6`] if it is in the `AF_INET6`
     /// family.
     </span><span class="kw">pub fn </span>as_socket_ipv6(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; <span class="prelude-ty">Option</span>&lt;SocketAddrV6&gt; {
         <span class="kw">match </span><span class="self">self</span>.as_socket() {
             <span class="prelude-val">Some</span>(SocketAddr::V6(addr)) =&gt; <span class="prelude-val">Some</span>(addr),
             <span class="kw">_ </span>=&gt; <span class="prelude-val">None</span>,
         }
     }
 }

 <span class="kw">impl </span>From&lt;SocketAddr&gt; <span class="kw">for </span>SockAddr {
     <span class="kw">fn </span>from(addr: SocketAddr) -&gt; SockAddr {
         <span class="kw">match </span>addr {
             SocketAddr::V4(addr) =&gt; addr.into(),
             SocketAddr::V6(addr) =&gt; addr.into(),
         }
     }
 }

 <span class="kw">impl </span>From&lt;SocketAddrV4&gt; <span class="kw">for </span>SockAddr {
     <span class="kw">fn </span>from(addr: SocketAddrV4) -&gt; SockAddr {
         <span class="kw">let </span>sockaddr_in = sockaddr_in {
             sin_family: AF_INET <span class="kw">as </span>sa_family_t,
             sin_port: addr.port().to_be(),
             sin_addr: <span class="kw">crate</span>::sys::to_in_addr(addr.ip()),
             sin_zero: Default::default(),
             <span class="attribute">#[cfg(any(
                 target_os = <span class="string">&quot;dragonfly&quot;</span>,
                 target_os = <span class="string">&quot;freebsd&quot;</span>,
                 target_os = <span class="string">&quot;haiku&quot;</span>,
                 target_os = <span class="string">&quot;ios&quot;</span>,
                 target_os = <span class="string">&quot;macos&quot;</span>,
                 target_os = <span class="string">&quot;netbsd&quot;</span>,
                 target_os = <span class="string">&quot;openbsd&quot;
             </span>))]
             </span>sin_len: <span class="number">0</span>,
         };
         <span class="kw">let </span><span class="kw-2">mut </span>storage = MaybeUninit::&lt;sockaddr_storage&gt;::zeroed();
         <span class="comment">// Safety: A `sockaddr_in` is memory compatible with a `sockaddr_storage`
         </span><span class="kw">unsafe </span>{ (storage.as_mut_ptr() <span class="kw">as </span><span class="kw-2">*mut </span>sockaddr_in).write(sockaddr_in) };
         SockAddr {
             storage: <span class="kw">unsafe </span>{ storage.assume_init() },
             len: mem::size_of::&lt;sockaddr_in&gt;() <span class="kw">as </span>socklen_t,
         }
     }
 }

 <span class="kw">impl </span>From&lt;SocketAddrV6&gt; <span class="kw">for </span>SockAddr {
     <span class="kw">fn </span>from(addr: SocketAddrV6) -&gt; SockAddr {
         <span class="attribute">#[cfg(windows)]
         </span><span class="kw">let </span>u = <span class="kw">unsafe </span>{
             <span class="kw">let </span><span class="kw-2">mut </span>u = mem::zeroed::&lt;SOCKADDR_IN6_LH_u&gt;();
             <span class="kw-2">*</span>u.sin6_scope_id_mut() = addr.scope_id();
             u
         };

         <span class="kw">let </span>sockaddr_in6 = sockaddr_in6 {
             sin6_family: AF_INET6 <span class="kw">as </span>sa_family_t,
             sin6_port: addr.port().to_be(),
             sin6_addr: <span class="kw">crate</span>::sys::to_in6_addr(addr.ip()),
             sin6_flowinfo: addr.flowinfo(),
             <span class="attribute">#[cfg(unix)]
             </span>sin6_scope_id: addr.scope_id(),
             <span class="attribute">#[cfg(windows)]
             </span>u,
             <span class="attribute">#[cfg(any(
                 target_os = <span class="string">&quot;dragonfly&quot;</span>,
                 target_os = <span class="string">&quot;freebsd&quot;</span>,
                 target_os = <span class="string">&quot;haiku&quot;</span>,
                 target_os = <span class="string">&quot;ios&quot;</span>,
                 target_os = <span class="string">&quot;macos&quot;</span>,
                 target_os = <span class="string">&quot;netbsd&quot;</span>,
                 target_os = <span class="string">&quot;openbsd&quot;
             </span>))]
             </span>sin6_len: <span class="number">0</span>,
             <span class="attribute">#[cfg(any(target_os = <span class="string">&quot;solaris&quot;</span>, target_os = <span class="string">&quot;illumos&quot;</span>))]
             </span>__sin6_src_id: <span class="number">0</span>,
         };
         <span class="kw">let </span><span class="kw-2">mut </span>storage = MaybeUninit::&lt;sockaddr_storage&gt;::zeroed();
         <span class="comment">// Safety: A `sockaddr_in6` is memory compatible with a `sockaddr_storage`
         </span><span class="kw">unsafe </span>{ (storage.as_mut_ptr() <span class="kw">as </span><span class="kw-2">*mut </span>sockaddr_in6).write(sockaddr_in6) };
         SockAddr {
             storage: <span class="kw">unsafe </span>{ storage.assume_init() },
             len: mem::size_of::&lt;sockaddr_in6&gt;() <span class="kw">as </span>socklen_t,
         }
     }
 }

 <span class="kw">impl </span>fmt::Debug <span class="kw">for </span>SockAddr {
     <span class="kw">fn </span>fmt(<span class="kw-2">&amp;</span><span class="self">self</span>, fmt: <span class="kw-2">&amp;mut </span>fmt::Formatter&lt;<span class="lifetime">&#39;_</span>&gt;) -&gt; fmt::Result {
         <span class="kw">let </span><span class="kw-2">mut </span>f = fmt.debug_struct(<span class="string">&quot;SockAddr&quot;</span>);
         <span class="attribute">#[cfg(any(
             target_os = <span class="string">&quot;dragonfly&quot;</span>,
             target_os = <span class="string">&quot;freebsd&quot;</span>,
             target_os = <span class="string">&quot;haiku&quot;</span>,
             target_os = <span class="string">&quot;hermit&quot;</span>,
             target_os = <span class="string">&quot;ios&quot;</span>,
             target_os = <span class="string">&quot;macos&quot;</span>,
             target_os = <span class="string">&quot;netbsd&quot;</span>,
             target_os = <span class="string">&quot;openbsd&quot;</span>,
             target_os = <span class="string">&quot;vxworks&quot;</span>,
             target_os = <span class="string">&quot;nto&quot;</span>,
         ))]
         </span>f.field(<span class="string">&quot;ss_len&quot;</span>, <span class="kw-2">&amp;</span><span class="self">self</span>.storage.ss_len);
         f.field(<span class="string">&quot;ss_family&quot;</span>, <span class="kw-2">&amp;</span><span class="self">self</span>.storage.ss_family)
             .field(<span class="string">&quot;len&quot;</span>, <span class="kw-2">&amp;</span><span class="self">self</span>.len)
             .finish()
     }
 }

 <span class="attribute">#[test]
 </span><span class="kw">fn </span>ipv4() {
     <span class="kw">use </span>std::net::Ipv4Addr;
     <span class="kw">let </span>std = SocketAddrV4::new(Ipv4Addr::new(<span class="number">1</span>, <span class="number">2</span>, <span class="number">3</span>, <span class="number">4</span>), <span class="number">9876</span>);
     <span class="kw">let </span>addr = SockAddr::from(std);
     <span class="macro">assert_eq!</span>(addr.family(), AF_INET <span class="kw">as </span>sa_family_t);
     <span class="macro">assert_eq!</span>(addr.len(), size_of::&lt;sockaddr_in&gt;() <span class="kw">as </span>socklen_t);
     <span class="macro">assert_eq!</span>(addr.as_socket(), <span class="prelude-val">Some</span>(SocketAddr::V4(std)));
     <span class="macro">assert_eq!</span>(addr.as_socket_ipv4(), <span class="prelude-val">Some</span>(std));
     <span class="macro">assert!</span>(addr.as_socket_ipv6().is_none());

     <span class="kw">let </span>addr = SockAddr::from(SocketAddr::from(std));
     <span class="macro">assert_eq!</span>(addr.family(), AF_INET <span class="kw">as </span>sa_family_t);
     <span class="macro">assert_eq!</span>(addr.len(), size_of::&lt;sockaddr_in&gt;() <span class="kw">as </span>socklen_t);
     <span class="macro">assert_eq!</span>(addr.as_socket(), <span class="prelude-val">Some</span>(SocketAddr::V4(std)));
     <span class="macro">assert_eq!</span>(addr.as_socket_ipv4(), <span class="prelude-val">Some</span>(std));
     <span class="macro">assert!</span>(addr.as_socket_ipv6().is_none());
 }

 <span class="attribute">#[test]
 </span><span class="kw">fn </span>ipv6() {
     <span class="kw">use </span>std::net::Ipv6Addr;
     <span class="kw">let </span>std = SocketAddrV6::new(Ipv6Addr::new(<span class="number">1</span>, <span class="number">2</span>, <span class="number">3</span>, <span class="number">4</span>, <span class="number">5</span>, <span class="number">6</span>, <span class="number">7</span>, <span class="number">8</span>), <span class="number">9876</span>, <span class="number">11</span>, <span class="number">12</span>);
     <span class="kw">let </span>addr = SockAddr::from(std);
     <span class="macro">assert_eq!</span>(addr.family(), AF_INET6 <span class="kw">as </span>sa_family_t);
     <span class="macro">assert_eq!</span>(addr.len(), size_of::&lt;sockaddr_in6&gt;() <span class="kw">as </span>socklen_t);
     <span class="macro">assert_eq!</span>(addr.as_socket(), <span class="prelude-val">Some</span>(SocketAddr::V6(std)));
     <span class="macro">assert!</span>(addr.as_socket_ipv4().is_none());
     <span class="macro">assert_eq!</span>(addr.as_socket_ipv6(), <span class="prelude-val">Some</span>(std));

     <span class="kw">let </span>addr = SockAddr::from(SocketAddr::from(std));
     <span class="macro">assert_eq!</span>(addr.family(), AF_INET6 <span class="kw">as </span>sa_family_t);
     <span class="macro">assert_eq!</span>(addr.len(), size_of::&lt;sockaddr_in6&gt;() <span class="kw">as </span>socklen_t);
     <span class="macro">assert_eq!</span>(addr.as_socket(), <span class="prelude-val">Some</span>(SocketAddr::V6(std)));
     <span class="macro">assert!</span>(addr.as_socket_ipv4().is_none());
     <span class="macro">assert_eq!</span>(addr.as_socket_ipv6(), <span class="prelude-val">Some</span>(std));
 }
 </code></pre></div>
 </section></div></main><div id="rustdoc-vars" data-root-path="../../" data-current-crate="socket2" data-themes="ayu,dark,light" data-resource-suffix="" data-rustdoc-version="1.66.0-nightly (5c8bff74b 2022-10-21)" ></div></body></html>