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| </pre><div class="example-wrap"><pre class="rust "> |
| <span class="kw">mod</span> <span class="ident">socketaddr</span>; |
| <span class="kw">pub</span> <span class="kw">use</span> <span class="self">self</span>::<span class="ident">socketaddr</span>::<span class="ident">SocketAddr</span>; |
| |
| <span class="doccomment">/// Get the `sun_path` field offset of `sockaddr_un` for the target OS.</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// On Linux, this funtion equates to the same value as</span> |
| <span class="doccomment">/// `size_of::<sa_family_t>()`, but some other implementations include</span> |
| <span class="doccomment">/// other fields before `sun_path`, so the expression more portably</span> |
| <span class="doccomment">/// describes the size of the address structure.</span> |
| <span class="kw">pub</span>(<span class="kw">in</span> <span class="kw">crate</span>::<span class="ident">sys</span>) <span class="kw">fn</span> <span class="ident">path_offset</span>(<span class="ident">sockaddr</span>: <span class="kw-2">&</span><span class="ident">libc</span>::<span class="ident">sockaddr_un</span>) <span class="op">-</span><span class="op">></span> <span class="ident">usize</span> { |
| <span class="kw">let</span> <span class="ident">base</span> <span class="op">=</span> <span class="ident">sockaddr</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="ident">usize</span>; |
| <span class="kw">let</span> <span class="ident">path</span> <span class="op">=</span> <span class="kw-2">&</span><span class="ident">sockaddr</span>.<span class="ident">sun_path</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="ident">usize</span>; |
| <span class="ident">path</span> <span class="op">-</span> <span class="ident">base</span> |
| } |
| |
| <span class="macro">cfg_os_poll</span><span class="macro">!</span> { |
| <span class="kw">use</span> <span class="ident">std</span>::<span class="ident">cmp</span>::<span class="ident">Ordering</span>; |
| <span class="kw">use</span> <span class="ident">std</span>::<span class="ident">os</span>::<span class="ident">unix</span>::<span class="ident">ffi</span>::<span class="ident">OsStrExt</span>; |
| <span class="kw">use</span> <span class="ident">std</span>::<span class="ident">os</span>::<span class="ident">unix</span>::<span class="ident">io</span>::{<span class="ident">RawFd</span>, <span class="ident">FromRawFd</span>}; |
| <span class="kw">use</span> <span class="ident">std</span>::<span class="ident">path</span>::<span class="ident">Path</span>; |
| <span class="kw">use</span> <span class="ident">std</span>::{<span class="ident">io</span>, <span class="ident">mem</span>}; |
| |
| <span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">mod</span> <span class="ident">datagram</span>; |
| <span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">mod</span> <span class="ident">listener</span>; |
| <span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">mod</span> <span class="ident">stream</span>; |
| |
| <span class="kw">pub</span>(<span class="kw">in</span> <span class="kw">crate</span>::<span class="ident">sys</span>) <span class="kw">fn</span> <span class="ident">socket_addr</span>(<span class="ident">path</span>: <span class="kw-2">&</span><span class="ident">Path</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">sockaddr_un</span>, <span class="ident">libc</span>::<span class="ident">socklen_t</span>)<span class="op">></span> { |
| <span class="kw">let</span> <span class="ident">sockaddr</span> <span class="op">=</span> <span class="ident">mem</span>::<span class="ident">MaybeUninit</span>::<span class="op"><</span><span class="ident">libc</span>::<span class="ident">sockaddr_un</span><span class="op">></span>::<span class="ident">zeroed</span>(); |
| |
| <span class="comment">// This is safe to assume because a `libc::sockaddr_un` filled with `0`</span> |
| <span class="comment">// bytes is properly initialized.</span> |
| <span class="comment">//</span> |
| <span class="comment">// `0` is a valid value for `sockaddr_un::sun_family`; it is</span> |
| <span class="comment">// `libc::AF_UNSPEC`.</span> |
| <span class="comment">//</span> |
| <span class="comment">// `[0; 108]` is a valid value for `sockaddr_un::sun_path`; it begins an</span> |
| <span class="comment">// abstract path.</span> |
| <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">sockaddr</span> <span class="op">=</span> <span class="kw">unsafe</span> { <span class="ident">sockaddr</span>.<span class="ident">assume_init</span>() }; |
| |
| <span class="ident">sockaddr</span>.<span class="ident">sun_family</span> <span class="op">=</span> <span class="ident">libc</span>::<span class="ident">AF_UNIX</span> <span class="kw">as</span> <span class="ident">libc</span>::<span class="ident">sa_family_t</span>; |
| |
| <span class="kw">let</span> <span class="ident">bytes</span> <span class="op">=</span> <span class="ident">path</span>.<span class="ident">as_os_str</span>().<span class="ident">as_bytes</span>(); |
| <span class="kw">match</span> (<span class="ident">bytes</span>.<span class="ident">get</span>(<span class="number">0</span>), <span class="ident">bytes</span>.<span class="ident">len</span>().<span class="ident">cmp</span>(<span class="kw-2">&</span><span class="ident">sockaddr</span>.<span class="ident">sun_path</span>.<span class="ident">len</span>())) { |
| <span class="comment">// Abstract paths don't need a null terminator</span> |
| (<span class="prelude-val">Some</span>(<span class="kw-2">&</span><span class="number">0</span>), <span class="ident">Ordering</span>::<span class="ident">Greater</span>) <span class="op">=</span><span class="op">></span> { |
| <span class="kw">return</span> <span class="prelude-val">Err</span>(<span class="ident">io</span>::<span class="ident">Error</span>::<span class="ident">new</span>( |
| <span class="ident">io</span>::<span class="ident">ErrorKind</span>::<span class="ident">InvalidInput</span>, |
| <span class="string">"path must be no longer than libc::sockaddr_un.sun_path"</span>, |
| )); |
| } |
| (<span class="kw">_</span>, <span class="ident">Ordering</span>::<span class="ident">Greater</span>) <span class="op">|</span> (<span class="kw">_</span>, <span class="ident">Ordering</span>::<span class="ident">Equal</span>) <span class="op">=</span><span class="op">></span> { |
| <span class="kw">return</span> <span class="prelude-val">Err</span>(<span class="ident">io</span>::<span class="ident">Error</span>::<span class="ident">new</span>( |
| <span class="ident">io</span>::<span class="ident">ErrorKind</span>::<span class="ident">InvalidInput</span>, |
| <span class="string">"path must be shorter than libc::sockaddr_un.sun_path"</span>, |
| )); |
| } |
| <span class="kw">_</span> <span class="op">=</span><span class="op">></span> {} |
| } |
| |
| <span class="kw">for</span> (<span class="ident">dst</span>, <span class="ident">src</span>) <span class="kw">in</span> <span class="ident">sockaddr</span>.<span class="ident">sun_path</span>.<span class="ident">iter_mut</span>().<span class="ident">zip</span>(<span class="ident">bytes</span>.<span class="ident">iter</span>()) { |
| <span class="kw-2">*</span><span class="ident">dst</span> <span class="op">=</span> <span class="kw-2">*</span><span class="ident">src</span> <span class="kw">as</span> <span class="ident">libc</span>::<span class="ident">c_char</span>; |
| } |
| |
| <span class="kw">let</span> <span class="ident">offset</span> <span class="op">=</span> <span class="ident">path_offset</span>(<span class="kw-2">&</span><span class="ident">sockaddr</span>); |
| <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">socklen</span> <span class="op">=</span> <span class="ident">offset</span> <span class="op">+</span> <span class="ident">bytes</span>.<span class="ident">len</span>(); |
| |
| <span class="kw">match</span> <span class="ident">bytes</span>.<span class="ident">get</span>(<span class="number">0</span>) { |
| <span class="comment">// The struct has already been zeroes so the null byte for pathname</span> |
| <span class="comment">// addresses is already there.</span> |
| <span class="prelude-val">Some</span>(<span class="kw-2">&</span><span class="number">0</span>) <span class="op">|</span> <span class="prelude-val">None</span> <span class="op">=</span><span class="op">></span> {} |
| <span class="prelude-val">Some</span>(<span class="kw">_</span>) <span class="op">=</span><span class="op">></span> <span class="ident">socklen</span> <span class="op">+</span><span class="op">=</span> <span class="number">1</span>, |
| } |
| |
| <span class="prelude-val">Ok</span>((<span class="ident">sockaddr</span>, <span class="ident">socklen</span> <span class="kw">as</span> <span class="ident">libc</span>::<span class="ident">socklen_t</span>)) |
| } |
| |
| <span class="kw">fn</span> <span class="ident">pair</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>(<span class="ident">flags</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">T</span>, <span class="ident">T</span>)<span class="op">></span> |
| <span class="kw">where</span> <span class="ident">T</span>: <span class="ident">FromRawFd</span>, |
| { |
| <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">not</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">flags</span> <span class="op">=</span> <span class="ident">flags</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="kw">let</span> <span class="kw-2">mut</span> <span class="ident">fds</span> <span class="op">=</span> [<span class="op">-</span><span class="number">1</span>; <span class="number">2</span>]; |
| <span class="macro">syscall</span><span class="macro">!</span>(<span class="ident">socketpair</span>(<span class="ident">libc</span>::<span class="ident">AF_UNIX</span>, <span class="ident">flags</span>, <span class="number">0</span>, <span class="ident">fds</span>.<span class="ident">as_mut_ptr</span>()))<span class="question-mark">?</span>; |
| <span class="kw">let</span> <span class="ident">pair</span> <span class="op">=</span> <span class="kw">unsafe</span> { (<span class="ident">T</span>::<span class="ident">from_raw_fd</span>(<span class="ident">fds</span>[<span class="number">0</span>]), <span class="ident">T</span>::<span class="ident">from_raw_fd</span>(<span class="ident">fds</span>[<span class="number">1</span>])) }; |
| |
| <span class="comment">// Darwin and Solaris do not have SOCK_NONBLOCK or SOCK_CLOEXEC.</span> |
| <span class="comment">//</span> |
| <span class="comment">// In order to set those flags, additional `fcntl` sys calls must be</span> |
| <span class="comment">// performed. If a `fnctl` fails after the sockets have been created,</span> |
| <span class="comment">// the file descriptors will leak. Creating `pair` above ensures that if</span> |
| <span class="comment">// there is an error, the file descriptors are closed.</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="macro">syscall</span><span class="macro">!</span>(<span class="ident">fcntl</span>(<span class="ident">fds</span>[<span class="number">0</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="question-mark">?</span>; |
| <span class="macro">syscall</span><span class="macro">!</span>(<span class="ident">fcntl</span>(<span class="ident">fds</span>[<span class="number">0</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="question-mark">?</span>; |
| <span class="macro">syscall</span><span class="macro">!</span>(<span class="ident">fcntl</span>(<span class="ident">fds</span>[<span class="number">1</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="question-mark">?</span>; |
| <span class="macro">syscall</span><span class="macro">!</span>(<span class="ident">fcntl</span>(<span class="ident">fds</span>[<span class="number">1</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="question-mark">?</span>; |
| } |
| <span class="prelude-val">Ok</span>(<span class="ident">pair</span>) |
| } |
| |
| <span class="comment">// The following functions can't simply be replaced with a call to</span> |
| <span class="comment">// `net::UnixDatagram` because of our `SocketAddr` type.</span> |
| |
| <span class="kw">fn</span> <span class="ident">local_addr</span>(<span class="ident">socket</span>: <span class="ident">RawFd</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="ident">SocketAddr</span>::<span class="ident">new</span>(<span class="op">|</span><span class="ident">sockaddr</span>, <span class="ident">socklen</span><span class="op">|</span> <span class="macro">syscall</span><span class="macro">!</span>(<span class="ident">getsockname</span>(<span class="ident">socket</span>, <span class="ident">sockaddr</span>, <span class="ident">socklen</span>))) |
| } |
| |
| <span class="kw">fn</span> <span class="ident">peer_addr</span>(<span class="ident">socket</span>: <span class="ident">RawFd</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="ident">SocketAddr</span>::<span class="ident">new</span>(<span class="op">|</span><span class="ident">sockaddr</span>, <span class="ident">socklen</span><span class="op">|</span> <span class="macro">syscall</span><span class="macro">!</span>(<span class="ident">getpeername</span>(<span class="ident">socket</span>, <span class="ident">sockaddr</span>, <span class="ident">socklen</span>))) |
| } |
| |
| <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">test</span>)]</span> |
| <span class="kw">mod</span> <span class="ident">tests</span> { |
| <span class="kw">use</span> <span class="kw">super</span>::{<span class="ident">path_offset</span>, <span class="ident">socket_addr</span>}; |
| <span class="kw">use</span> <span class="ident">std</span>::<span class="ident">path</span>::<span class="ident">Path</span>; |
| <span class="kw">use</span> <span class="ident">std</span>::<span class="ident">str</span>; |
| |
| <span class="attribute">#[<span class="ident">test</span>]</span> |
| <span class="kw">fn</span> <span class="ident">pathname_address</span>() { |
| <span class="kw">const</span> <span class="ident">PATH</span>: <span class="kw-2">&</span><span class="ident">str</span> <span class="op">=</span> <span class="string">"./foo/bar.txt"</span>; |
| <span class="kw">const</span> <span class="ident">PATH_LEN</span>: <span class="ident">usize</span> <span class="op">=</span> <span class="number">13</span>; |
| |
| <span class="comment">// Pathname addresses do have a null terminator, so `socklen` is</span> |
| <span class="comment">// expected to be `PATH_LEN` + `offset` + 1.</span> |
| <span class="kw">let</span> <span class="ident">path</span> <span class="op">=</span> <span class="ident">Path</span>::<span class="ident">new</span>(<span class="ident">PATH</span>); |
| <span class="kw">let</span> (<span class="ident">sockaddr</span>, <span class="ident">actual</span>) <span class="op">=</span> <span class="ident">socket_addr</span>(<span class="ident">path</span>).<span class="ident">unwrap</span>(); |
| <span class="kw">let</span> <span class="ident">offset</span> <span class="op">=</span> <span class="ident">path_offset</span>(<span class="kw-2">&</span><span class="ident">sockaddr</span>); |
| <span class="kw">let</span> <span class="ident">expected</span> <span class="op">=</span> <span class="ident">PATH_LEN</span> <span class="op">+</span> <span class="ident">offset</span> <span class="op">+</span> <span class="number">1</span>; |
| <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">expected</span> <span class="kw">as</span> <span class="ident">libc</span>::<span class="ident">socklen_t</span>, <span class="ident">actual</span>) |
| } |
| |
| <span class="attribute">#[<span class="ident">test</span>]</span> |
| <span class="kw">fn</span> <span class="ident">abstract_address</span>() { |
| <span class="kw">const</span> <span class="ident">PATH</span>: <span class="kw-2">&</span>[<span class="ident">u8</span>] <span class="op">=</span> <span class="kw-2">&</span>[<span class="number">0</span>, <span class="number">116</span>, <span class="number">111</span>, <span class="number">107</span>, <span class="number">105</span>, <span class="number">111</span>]; |
| <span class="kw">const</span> <span class="ident">PATH_LEN</span>: <span class="ident">usize</span> <span class="op">=</span> <span class="number">6</span>; |
| |
| <span class="comment">// Abstract addresses do not have a null terminator, so `socklen` is</span> |
| <span class="comment">// expected to be `PATH_LEN` + `offset`.</span> |
| <span class="kw">let</span> <span class="ident">abstract_path</span> <span class="op">=</span> <span class="ident">str</span>::<span class="ident">from_utf8</span>(<span class="ident">PATH</span>).<span class="ident">unwrap</span>(); |
| <span class="kw">let</span> <span class="ident">path</span> <span class="op">=</span> <span class="ident">Path</span>::<span class="ident">new</span>(<span class="ident">abstract_path</span>); |
| <span class="kw">let</span> (<span class="ident">sockaddr</span>, <span class="ident">actual</span>) <span class="op">=</span> <span class="ident">socket_addr</span>(<span class="ident">path</span>).<span class="ident">unwrap</span>(); |
| <span class="kw">let</span> <span class="ident">offset</span> <span class="op">=</span> <span class="ident">path_offset</span>(<span class="kw-2">&</span><span class="ident">sockaddr</span>); |
| <span class="kw">let</span> <span class="ident">expected</span> <span class="op">=</span> <span class="ident">PATH_LEN</span> <span class="op">+</span> <span class="ident">offset</span>; |
| <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">expected</span> <span class="kw">as</span> <span class="ident">libc</span>::<span class="ident">socklen_t</span>, <span class="ident">actual</span>) |
| } |
| } |
| } |
| </pre></div> |
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