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| </pre><div class="example-wrap"><pre class="rust "> |
| <span class="kw">use</span> <span class="ident">std</span>::<span class="ident">io</span>; |
| <span class="kw">use</span> <span class="ident">std</span>::<span class="ident">mem</span>::<span class="ident">size_of</span>; |
| <span class="kw">use</span> <span class="ident">std</span>::<span class="ident">net</span>::{<span class="ident">Ipv4Addr</span>, <span class="ident">Ipv6Addr</span>, <span class="ident">SocketAddr</span>, <span class="ident">SocketAddrV4</span>, <span class="ident">SocketAddrV6</span>}; |
| |
| <span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn</span> <span class="ident">new_ip_socket</span>(<span class="ident">addr</span>: <span class="ident">SocketAddr</span>, <span class="ident">socket_type</span>: <span class="ident">libc</span>::<span class="ident">c_int</span>) <span class="op">-</span><span class="op">></span> <span class="ident">io</span>::<span class="prelude-ty">Result</span><span class="op"><</span><span class="ident">libc</span>::<span class="ident">c_int</span><span class="op">></span> { |
| <span class="kw">let</span> <span class="ident">domain</span> <span class="op">=</span> <span class="kw">match</span> <span class="ident">addr</span> { |
| <span class="ident">SocketAddr</span>::<span class="ident">V4</span>(..) <span class="op">=</span><span class="op">></span> <span class="ident">libc</span>::<span class="ident">AF_INET</span>, |
| <span class="ident">SocketAddr</span>::<span class="ident">V6</span>(..) <span class="op">=</span><span class="op">></span> <span class="ident">libc</span>::<span class="ident">AF_INET6</span>, |
| }; |
| |
| <span class="ident">new_socket</span>(<span class="ident">domain</span>, <span class="ident">socket_type</span>) |
| } |
| |
| <span class="doccomment">/// Create a new non-blocking socket.</span> |
| <span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn</span> <span class="ident">new_socket</span>(<span class="ident">domain</span>: <span class="ident">libc</span>::<span class="ident">c_int</span>, <span class="ident">socket_type</span>: <span class="ident">libc</span>::<span class="ident">c_int</span>) <span class="op">-</span><span class="op">></span> <span class="ident">io</span>::<span class="prelude-ty">Result</span><span class="op"><</span><span class="ident">libc</span>::<span class="ident">c_int</span><span class="op">></span> { |
| <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">any</span>( |
| <span class="ident">target_os</span> <span class="op">=</span> <span class="string">"android"</span>, |
| <span class="ident">target_os</span> <span class="op">=</span> <span class="string">"dragonfly"</span>, |
| <span class="ident">target_os</span> <span class="op">=</span> <span class="string">"freebsd"</span>, |
| <span class="ident">target_os</span> <span class="op">=</span> <span class="string">"illumos"</span>, |
| <span class="ident">target_os</span> <span class="op">=</span> <span class="string">"linux"</span>, |
| <span class="ident">target_os</span> <span class="op">=</span> <span class="string">"netbsd"</span>, |
| <span class="ident">target_os</span> <span class="op">=</span> <span class="string">"openbsd"</span> |
| ))]</span> |
| <span class="kw">let</span> <span class="ident">socket_type</span> <span class="op">=</span> <span class="ident">socket_type</span> <span class="op">|</span> <span class="ident">libc</span>::<span class="ident">SOCK_NONBLOCK</span> <span class="op">|</span> <span class="ident">libc</span>::<span class="ident">SOCK_CLOEXEC</span>; |
| |
| <span class="comment">// Gives a warning for platforms without SOCK_NONBLOCK.</span> |
| <span class="attribute">#[<span class="ident">allow</span>(<span class="ident">clippy</span>::<span class="ident">let_and_return</span>)]</span> |
| <span class="kw">let</span> <span class="ident">socket</span> <span class="op">=</span> <span class="macro">syscall</span><span class="macro">!</span>(<span class="ident">socket</span>(<span class="ident">domain</span>, <span class="ident">socket_type</span>, <span class="number">0</span>)); |
| |
| <span class="comment">// Mimick `libstd` and set `SO_NOSIGPIPE` on apple systems.</span> |
| <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">target_vendor</span> <span class="op">=</span> <span class="string">"apple"</span>)]</span> |
| <span class="kw">let</span> <span class="ident">socket</span> <span class="op">=</span> <span class="ident">socket</span>.<span class="ident">and_then</span>(<span class="op">|</span><span class="ident">socket</span><span class="op">|</span> { |
| <span class="macro">syscall</span><span class="macro">!</span>(<span class="ident">setsockopt</span>( |
| <span class="ident">socket</span>, |
| <span class="ident">libc</span>::<span class="ident">SOL_SOCKET</span>, |
| <span class="ident">libc</span>::<span class="ident">SO_NOSIGPIPE</span>, |
| <span class="kw-2">&</span><span class="number">1</span> <span class="kw">as</span> <span class="kw-2">*</span><span class="kw">const</span> <span class="ident">libc</span>::<span class="ident">c_int</span> <span class="kw">as</span> <span class="kw-2">*</span><span class="kw">const</span> <span class="ident">libc</span>::<span class="ident">c_void</span>, |
| <span class="ident">size_of</span>::<span class="op"><</span><span class="ident">libc</span>::<span class="ident">c_int</span><span class="op">></span>() <span class="kw">as</span> <span class="ident">libc</span>::<span class="ident">socklen_t</span> |
| )) |
| .<span class="ident">map</span>(<span class="op">|</span><span class="kw">_</span><span class="op">|</span> <span class="ident">socket</span>) |
| }); |
| |
| <span class="comment">// Darwin doesn't have SOCK_NONBLOCK or SOCK_CLOEXEC. Not sure about</span> |
| <span class="comment">// Solaris, couldn't find anything online.</span> |
| <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">any</span>(<span class="ident">target_os</span> <span class="op">=</span> <span class="string">"ios"</span>, <span class="ident">target_os</span> <span class="op">=</span> <span class="string">"macos"</span>, <span class="ident">target_os</span> <span class="op">=</span> <span class="string">"solaris"</span>))]</span> |
| <span class="kw">let</span> <span class="ident">socket</span> <span class="op">=</span> <span class="ident">socket</span>.<span class="ident">and_then</span>(<span class="op">|</span><span class="ident">socket</span><span class="op">|</span> { |
| <span class="comment">// For platforms that don't support flags in socket, we need to</span> |
| <span class="comment">// set the flags ourselves.</span> |
| <span class="macro">syscall</span><span class="macro">!</span>(<span class="ident">fcntl</span>(<span class="ident">socket</span>, <span class="ident">libc</span>::<span class="ident">F_SETFL</span>, <span class="ident">libc</span>::<span class="ident">O_NONBLOCK</span>)) |
| .<span class="ident">and_then</span>(<span class="op">|</span><span class="kw">_</span><span class="op">|</span> <span class="macro">syscall</span><span class="macro">!</span>(<span class="ident">fcntl</span>(<span class="ident">socket</span>, <span class="ident">libc</span>::<span class="ident">F_SETFD</span>, <span class="ident">libc</span>::<span class="ident">FD_CLOEXEC</span>)).<span class="ident">map</span>(<span class="op">|</span><span class="kw">_</span><span class="op">|</span> <span class="ident">socket</span>)) |
| .<span class="ident">map_err</span>(<span class="op">|</span><span class="ident">e</span><span class="op">|</span> { |
| <span class="comment">// If either of the `fcntl` calls failed, ensure the socket is</span> |
| <span class="comment">// closed and return the error.</span> |
| <span class="kw">let</span> <span class="kw">_</span> <span class="op">=</span> <span class="macro">syscall</span><span class="macro">!</span>(<span class="ident">close</span>(<span class="ident">socket</span>)); |
| <span class="ident">e</span> |
| }) |
| }); |
| |
| <span class="ident">socket</span> |
| } |
| |
| <span class="doccomment">/// A type with the same memory layout as `libc::sockaddr`. Used in converting Rust level</span> |
| <span class="doccomment">/// SocketAddr* types into their system representation. The benefit of this specific</span> |
| <span class="doccomment">/// type over using `libc::sockaddr_storage` is that this type is exactly as large as it</span> |
| <span class="doccomment">/// needs to be and not a lot larger. And it can be initialized cleaner from Rust.</span> |
| <span class="attribute">#[<span class="ident">repr</span>(<span class="ident">C</span>)]</span> |
| <span class="kw">pub</span>(<span class="kw">crate</span>) <span class="ident">union</span> <span class="ident">SocketAddrCRepr</span> { |
| <span class="ident">v4</span>: <span class="ident">libc</span>::<span class="ident">sockaddr_in</span>, |
| <span class="ident">v6</span>: <span class="ident">libc</span>::<span class="ident">sockaddr_in6</span>, |
| } |
| |
| <span class="kw">impl</span> <span class="ident">SocketAddrCRepr</span> { |
| <span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn</span> <span class="ident">as_ptr</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-</span><span class="op">></span> <span class="kw-2">*</span><span class="kw">const</span> <span class="ident">libc</span>::<span class="ident">sockaddr</span> { |
| <span class="self">self</span> <span class="kw">as</span> <span class="kw-2">*</span><span class="kw">const</span> <span class="kw">_</span> <span class="kw">as</span> <span class="kw-2">*</span><span class="kw">const</span> <span class="ident">libc</span>::<span class="ident">sockaddr</span> |
| } |
| } |
| |
| <span class="doccomment">/// Converts a Rust `SocketAddr` into the system representation.</span> |
| <span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn</span> <span class="ident">socket_addr</span>(<span class="ident">addr</span>: <span class="kw-2">&</span><span class="ident">SocketAddr</span>) <span class="op">-</span><span class="op">></span> (<span class="ident">SocketAddrCRepr</span>, <span class="ident">libc</span>::<span class="ident">socklen_t</span>) { |
| <span class="kw">match</span> <span class="ident">addr</span> { |
| <span class="ident">SocketAddr</span>::<span class="ident">V4</span>(<span class="kw-2">ref</span> <span class="ident">addr</span>) <span class="op">=</span><span class="op">></span> { |
| <span class="comment">// `s_addr` is stored as BE on all machine and the array is in BE order.</span> |
| <span class="comment">// So the native endian conversion method is used so that it's never swapped.</span> |
| <span class="kw">let</span> <span class="ident">sin_addr</span> <span class="op">=</span> <span class="ident">libc</span>::<span class="ident">in_addr</span> { |
| <span class="ident">s_addr</span>: <span class="ident">u32</span>::<span class="ident">from_ne_bytes</span>(<span class="ident">addr</span>.<span class="ident">ip</span>().<span class="ident">octets</span>()), |
| }; |
| |
| <span class="kw">let</span> <span class="ident">sockaddr_in</span> <span class="op">=</span> <span class="ident">libc</span>::<span class="ident">sockaddr_in</span> { |
| <span class="ident">sin_family</span>: <span class="ident">libc</span>::<span class="ident">AF_INET</span> <span class="kw">as</span> <span class="ident">libc</span>::<span class="ident">sa_family_t</span>, |
| <span class="ident">sin_port</span>: <span class="ident">addr</span>.<span class="ident">port</span>().<span class="ident">to_be</span>(), |
| <span class="ident">sin_addr</span>, |
| <span class="ident">sin_zero</span>: [<span class="number">0</span>; <span class="number">8</span>], |
| <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">any</span>( |
| <span class="ident">target_os</span> <span class="op">=</span> <span class="string">"dragonfly"</span>, |
| <span class="ident">target_os</span> <span class="op">=</span> <span class="string">"freebsd"</span>, |
| <span class="ident">target_os</span> <span class="op">=</span> <span class="string">"ios"</span>, |
| <span class="ident">target_os</span> <span class="op">=</span> <span class="string">"macos"</span>, |
| <span class="ident">target_os</span> <span class="op">=</span> <span class="string">"netbsd"</span>, |
| <span class="ident">target_os</span> <span class="op">=</span> <span class="string">"openbsd"</span> |
| ))]</span> |
| <span class="ident">sin_len</span>: <span class="number">0</span>, |
| }; |
| |
| <span class="kw">let</span> <span class="ident">sockaddr</span> <span class="op">=</span> <span class="ident">SocketAddrCRepr</span> { <span class="ident">v4</span>: <span class="ident">sockaddr_in</span> }; |
| <span class="kw">let</span> <span class="ident">socklen</span> <span class="op">=</span> <span class="ident">size_of</span>::<span class="op"><</span><span class="ident">libc</span>::<span class="ident">sockaddr_in</span><span class="op">></span>() <span class="kw">as</span> <span class="ident">libc</span>::<span class="ident">socklen_t</span>; |
| (<span class="ident">sockaddr</span>, <span class="ident">socklen</span>) |
| } |
| <span class="ident">SocketAddr</span>::<span class="ident">V6</span>(<span class="kw-2">ref</span> <span class="ident">addr</span>) <span class="op">=</span><span class="op">></span> { |
| <span class="kw">let</span> <span class="ident">sockaddr_in6</span> <span class="op">=</span> <span class="ident">libc</span>::<span class="ident">sockaddr_in6</span> { |
| <span class="ident">sin6_family</span>: <span class="ident">libc</span>::<span class="ident">AF_INET6</span> <span class="kw">as</span> <span class="ident">libc</span>::<span class="ident">sa_family_t</span>, |
| <span class="ident">sin6_port</span>: <span class="ident">addr</span>.<span class="ident">port</span>().<span class="ident">to_be</span>(), |
| <span class="ident">sin6_addr</span>: <span class="ident">libc</span>::<span class="ident">in6_addr</span> { |
| <span class="ident">s6_addr</span>: <span class="ident">addr</span>.<span class="ident">ip</span>().<span class="ident">octets</span>(), |
| }, |
| <span class="ident">sin6_flowinfo</span>: <span class="ident">addr</span>.<span class="ident">flowinfo</span>(), |
| <span class="ident">sin6_scope_id</span>: <span class="ident">addr</span>.<span class="ident">scope_id</span>(), |
| <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">any</span>( |
| <span class="ident">target_os</span> <span class="op">=</span> <span class="string">"dragonfly"</span>, |
| <span class="ident">target_os</span> <span class="op">=</span> <span class="string">"freebsd"</span>, |
| <span class="ident">target_os</span> <span class="op">=</span> <span class="string">"ios"</span>, |
| <span class="ident">target_os</span> <span class="op">=</span> <span class="string">"macos"</span>, |
| <span class="ident">target_os</span> <span class="op">=</span> <span class="string">"netbsd"</span>, |
| <span class="ident">target_os</span> <span class="op">=</span> <span class="string">"openbsd"</span> |
| ))]</span> |
| <span class="ident">sin6_len</span>: <span class="number">0</span>, |
| <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">any</span>(<span class="ident">target_os</span> <span class="op">=</span> <span class="string">"solaris"</span>, <span class="ident">target_os</span> <span class="op">=</span> <span class="string">"illumos"</span>))]</span> |
| <span class="ident">__sin6_src_id</span>: <span class="number">0</span>, |
| }; |
| |
| <span class="kw">let</span> <span class="ident">sockaddr</span> <span class="op">=</span> <span class="ident">SocketAddrCRepr</span> { <span class="ident">v6</span>: <span class="ident">sockaddr_in6</span> }; |
| <span class="kw">let</span> <span class="ident">socklen</span> <span class="op">=</span> <span class="ident">size_of</span>::<span class="op"><</span><span class="ident">libc</span>::<span class="ident">sockaddr_in6</span><span class="op">></span>() <span class="kw">as</span> <span class="ident">libc</span>::<span class="ident">socklen_t</span>; |
| (<span class="ident">sockaddr</span>, <span class="ident">socklen</span>) |
| } |
| } |
| } |
| |
| <span class="doccomment">/// Converts a `libc::sockaddr` compatible struct into a native Rust `SocketAddr`.</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// # Safety</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// `storage` must have the `ss_family` field correctly initialized.</span> |
| <span class="doccomment">/// `storage` must be initialised to a `sockaddr_in` or `sockaddr_in6`.</span> |
| <span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">unsafe</span> <span class="kw">fn</span> <span class="ident">to_socket_addr</span>( |
| <span class="ident">storage</span>: <span class="kw-2">*</span><span class="kw">const</span> <span class="ident">libc</span>::<span class="ident">sockaddr_storage</span>, |
| ) <span class="op">-</span><span class="op">></span> <span class="ident">io</span>::<span class="prelude-ty">Result</span><span class="op"><</span><span class="ident">SocketAddr</span><span class="op">></span> { |
| <span class="kw">match</span> (<span class="kw-2">*</span><span class="ident">storage</span>).<span class="ident">ss_family</span> <span class="kw">as</span> <span class="ident">libc</span>::<span class="ident">c_int</span> { |
| <span class="ident">libc</span>::<span class="ident">AF_INET</span> <span class="op">=</span><span class="op">></span> { |
| <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> <span class="ident">addr</span>: <span class="kw-2">&</span><span class="ident">libc</span>::<span class="ident">sockaddr_in</span> <span class="op">=</span> <span class="kw-2">&</span><span class="kw-2">*</span>(<span class="ident">storage</span> <span class="kw">as</span> <span class="kw-2">*</span><span class="kw">const</span> <span class="ident">libc</span>::<span class="ident">sockaddr_in</span>); |
| <span class="kw">let</span> <span class="ident">ip</span> <span class="op">=</span> <span class="ident">Ipv4Addr</span>::<span class="ident">from</span>(<span class="ident">addr</span>.<span class="ident">sin_addr</span>.<span class="ident">s_addr</span>.<span class="ident">to_ne_bytes</span>()); |
| <span class="kw">let</span> <span class="ident">port</span> <span class="op">=</span> <span class="ident">u16</span>::<span class="ident">from_be</span>(<span class="ident">addr</span>.<span class="ident">sin_port</span>); |
| <span class="prelude-val">Ok</span>(<span class="ident">SocketAddr</span>::<span class="ident">V4</span>(<span class="ident">SocketAddrV4</span>::<span class="ident">new</span>(<span class="ident">ip</span>, <span class="ident">port</span>))) |
| } |
| <span class="ident">libc</span>::<span class="ident">AF_INET6</span> <span class="op">=</span><span class="op">></span> { |
| <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> <span class="ident">addr</span>: <span class="kw-2">&</span><span class="ident">libc</span>::<span class="ident">sockaddr_in6</span> <span class="op">=</span> <span class="kw-2">&</span><span class="kw-2">*</span>(<span class="ident">storage</span> <span class="kw">as</span> <span class="kw-2">*</span><span class="kw">const</span> <span class="ident">libc</span>::<span class="ident">sockaddr_in6</span>); |
| <span class="kw">let</span> <span class="ident">ip</span> <span class="op">=</span> <span class="ident">Ipv6Addr</span>::<span class="ident">from</span>(<span class="ident">addr</span>.<span class="ident">sin6_addr</span>.<span class="ident">s6_addr</span>); |
| <span class="kw">let</span> <span class="ident">port</span> <span class="op">=</span> <span class="ident">u16</span>::<span class="ident">from_be</span>(<span class="ident">addr</span>.<span class="ident">sin6_port</span>); |
| <span class="prelude-val">Ok</span>(<span class="ident">SocketAddr</span>::<span class="ident">V6</span>(<span class="ident">SocketAddrV6</span>::<span class="ident">new</span>( |
| <span class="ident">ip</span>, |
| <span class="ident">port</span>, |
| <span class="ident">addr</span>.<span class="ident">sin6_flowinfo</span>, |
| <span class="ident">addr</span>.<span class="ident">sin6_scope_id</span>, |
| ))) |
| } |
| <span class="kw">_</span> <span class="op">=</span><span class="op">></span> <span class="prelude-val">Err</span>(<span class="ident">io</span>::<span class="ident">ErrorKind</span>::<span class="ident">InvalidInput</span>.<span class="ident">into</span>()), |
| } |
| } |
| </pre></div> |
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