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| </pre><pre class="rust"><code><span class="comment">// Copyright 2018 Developers of the Rand project.</span> |
| <span class="comment">//</span> |
| <span class="comment">// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or</span> |
| <span class="comment">// https://www.apache.org/licenses/LICENSE-2.0> or the MIT license</span> |
| <span class="comment">// <LICENSE-MIT or https://opensource.org/licenses/MIT>, at your</span> |
| <span class="comment">// option. This file may not be copied, modified, or distributed</span> |
| <span class="comment">// except according to those terms.</span> |
| <span class="kw">use</span> <span class="ident">core</span>::{<span class="ident">fmt</span>, <span class="ident">num::NonZeroU32</span>}; |
| |
| <span class="doccomment">/// A small and `no_std` compatible error type</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// The [`Error::raw_os_error()`] will indicate if the error is from the OS, and</span> |
| <span class="doccomment">/// if so, which error code the OS gave the application. If such an error is</span> |
| <span class="doccomment">/// encountered, please consult with your system documentation.</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// Internally this type is a NonZeroU32, with certain values reserved for</span> |
| <span class="doccomment">/// certain purposes, see [`Error::INTERNAL_START`] and [`Error::CUSTOM_START`].</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// *If this crate's `"std"` Cargo feature is enabled*, then:</span> |
| <span class="doccomment">/// - [`getrandom::Error`][Error] implements</span> |
| <span class="doccomment">/// [`std::error::Error`](https://doc.rust-lang.org/std/error/trait.Error.html)</span> |
| <span class="doccomment">/// - [`std::io::Error`](https://doc.rust-lang.org/std/io/struct.Error.html) implements</span> |
| <span class="doccomment">/// [`From<getrandom::Error>`](https://doc.rust-lang.org/std/convert/trait.From.html).</span> |
| <span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Copy</span>, <span class="ident">Clone</span>, <span class="ident">Eq</span>, <span class="ident">PartialEq</span>)]</span> |
| <span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">Error</span>(<span class="ident">NonZeroU32</span>); |
| |
| <span class="kw">const</span> <span class="kw">fn</span> <span class="ident">internal_error</span>(<span class="ident">n</span>: <span class="ident">u16</span>) -> <span class="ident">Error</span> { |
| <span class="comment">// SAFETY: code > 0 as INTERNAL_START > 0 and adding n won't overflow a u32.</span> |
| <span class="kw">let</span> <span class="ident">code</span> <span class="op">=</span> <span class="ident">Error::INTERNAL_START</span> <span class="op">+</span> (<span class="ident">n</span> <span class="kw">as</span> <span class="ident">u32</span>); |
| <span class="ident">Error</span>(<span class="kw">unsafe</span> { <span class="ident">NonZeroU32::new_unchecked</span>(<span class="ident">code</span>) }) |
| } |
| |
| <span class="kw">impl</span> <span class="ident">Error</span> { |
| <span class="doccomment">/// This target/platform is not supported by `getrandom`.</span> |
| <span class="kw">pub</span> <span class="kw">const</span> <span class="ident">UNSUPPORTED</span>: <span class="ident">Error</span> <span class="op">=</span> <span class="ident">internal_error</span>(<span class="number">0</span>); |
| <span class="doccomment">/// The platform-specific `errno` returned a non-positive value.</span> |
| <span class="kw">pub</span> <span class="kw">const</span> <span class="ident">ERRNO_NOT_POSITIVE</span>: <span class="ident">Error</span> <span class="op">=</span> <span class="ident">internal_error</span>(<span class="number">1</span>); |
| <span class="doccomment">/// Call to iOS [`SecRandomCopyBytes`](https://developer.apple.com/documentation/security/1399291-secrandomcopybytes) failed.</span> |
| <span class="kw">pub</span> <span class="kw">const</span> <span class="ident">IOS_SEC_RANDOM</span>: <span class="ident">Error</span> <span class="op">=</span> <span class="ident">internal_error</span>(<span class="number">3</span>); |
| <span class="doccomment">/// Call to Windows [`RtlGenRandom`](https://docs.microsoft.com/en-us/windows/win32/api/ntsecapi/nf-ntsecapi-rtlgenrandom) failed.</span> |
| <span class="kw">pub</span> <span class="kw">const</span> <span class="ident">WINDOWS_RTL_GEN_RANDOM</span>: <span class="ident">Error</span> <span class="op">=</span> <span class="ident">internal_error</span>(<span class="number">4</span>); |
| <span class="doccomment">/// RDRAND instruction failed due to a hardware issue.</span> |
| <span class="kw">pub</span> <span class="kw">const</span> <span class="ident">FAILED_RDRAND</span>: <span class="ident">Error</span> <span class="op">=</span> <span class="ident">internal_error</span>(<span class="number">5</span>); |
| <span class="doccomment">/// RDRAND instruction unsupported on this target.</span> |
| <span class="kw">pub</span> <span class="kw">const</span> <span class="ident">NO_RDRAND</span>: <span class="ident">Error</span> <span class="op">=</span> <span class="ident">internal_error</span>(<span class="number">6</span>); |
| <span class="doccomment">/// The browser does not have support for `self.crypto`.</span> |
| <span class="kw">pub</span> <span class="kw">const</span> <span class="ident">WEB_CRYPTO</span>: <span class="ident">Error</span> <span class="op">=</span> <span class="ident">internal_error</span>(<span class="number">7</span>); |
| <span class="doccomment">/// The browser does not have support for `crypto.getRandomValues`.</span> |
| <span class="kw">pub</span> <span class="kw">const</span> <span class="ident">WEB_GET_RANDOM_VALUES</span>: <span class="ident">Error</span> <span class="op">=</span> <span class="ident">internal_error</span>(<span class="number">8</span>); |
| <span class="doccomment">/// On VxWorks, call to `randSecure` failed (random number generator is not yet initialized).</span> |
| <span class="kw">pub</span> <span class="kw">const</span> <span class="ident">VXWORKS_RAND_SECURE</span>: <span class="ident">Error</span> <span class="op">=</span> <span class="ident">internal_error</span>(<span class="number">11</span>); |
| <span class="doccomment">/// NodeJS does not have support for the `crypto` module.</span> |
| <span class="kw">pub</span> <span class="kw">const</span> <span class="ident">NODE_CRYPTO</span>: <span class="ident">Error</span> <span class="op">=</span> <span class="ident">internal_error</span>(<span class="number">12</span>); |
| <span class="doccomment">/// NodeJS does not have support for `crypto.randomFillSync`.</span> |
| <span class="kw">pub</span> <span class="kw">const</span> <span class="ident">NODE_RANDOM_FILL_SYNC</span>: <span class="ident">Error</span> <span class="op">=</span> <span class="ident">internal_error</span>(<span class="number">13</span>); |
| |
| <span class="doccomment">/// Codes below this point represent OS Errors (i.e. positive i32 values).</span> |
| <span class="doccomment">/// Codes at or above this point, but below [`Error::CUSTOM_START`] are</span> |
| <span class="doccomment">/// reserved for use by the `rand` and `getrandom` crates.</span> |
| <span class="kw">pub</span> <span class="kw">const</span> <span class="ident">INTERNAL_START</span>: <span class="ident">u32</span> <span class="op">=</span> <span class="number">1</span> <span class="op"><</span><span class="op"><</span> <span class="number">31</span>; |
| |
| <span class="doccomment">/// Codes at or above this point can be used by users to define their own</span> |
| <span class="doccomment">/// custom errors.</span> |
| <span class="kw">pub</span> <span class="kw">const</span> <span class="ident">CUSTOM_START</span>: <span class="ident">u32</span> <span class="op">=</span> (<span class="number">1</span> <span class="op"><</span><span class="op"><</span> <span class="number">31</span>) <span class="op">+</span> (<span class="number">1</span> <span class="op"><</span><span class="op"><</span> <span class="number">30</span>); |
| |
| <span class="doccomment">/// Extract the raw OS error code (if this error came from the OS)</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// This method is identical to [`std::io::Error::raw_os_error()`][1], except</span> |
| <span class="doccomment">/// that it works in `no_std` contexts. If this method returns `None`, the</span> |
| <span class="doccomment">/// error value can still be formatted via the `Display` implementation.</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// [1]: https://doc.rust-lang.org/std/io/struct.Error.html#method.raw_os_error</span> |
| <span class="attribute">#[<span class="ident">inline</span>]</span> |
| <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">raw_os_error</span>(<span class="self">self</span>) -> <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">i32</span><span class="op">></span> { |
| <span class="kw">if</span> <span class="self">self</span>.<span class="number">0</span>.<span class="ident">get</span>() <span class="op"><</span> <span class="ident"><span class="self">Self</span>::INTERNAL_START</span> { |
| <span class="prelude-val">Some</span>(<span class="self">self</span>.<span class="number">0</span>.<span class="ident">get</span>() <span class="kw">as</span> <span class="ident">i32</span>) |
| } <span class="kw">else</span> { |
| <span class="prelude-val">None</span> |
| } |
| } |
| |
| <span class="doccomment">/// Extract the bare error code.</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// This code can either come from the underlying OS, or be a custom error.</span> |
| <span class="doccomment">/// Use [`Error::raw_os_error()`] to disambiguate.</span> |
| <span class="attribute">#[<span class="ident">inline</span>]</span> |
| <span class="kw">pub</span> <span class="kw">const</span> <span class="kw">fn</span> <span class="ident">code</span>(<span class="self">self</span>) -> <span class="ident">NonZeroU32</span> { |
| <span class="self">self</span>.<span class="number">0</span> |
| } |
| } |
| |
| <span class="macro">cfg_if!</span> { |
| <span class="kw">if</span> <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">unix</span>)]</span> { |
| <span class="kw">fn</span> <span class="ident">os_err</span>(<span class="ident">errno</span>: <span class="ident">i32</span>, <span class="ident">buf</span>: <span class="kw-2">&mut</span> [<span class="ident">u8</span>]) -> <span class="prelude-ty">Option</span><span class="op"><</span><span class="kw-2">&</span><span class="ident">str</span><span class="op">></span> { |
| <span class="kw">let</span> <span class="ident">buf_ptr</span> <span class="op">=</span> <span class="ident">buf</span>.<span class="ident">as_mut_ptr</span>() <span class="kw">as</span> <span class="kw-2">*mut</span> <span class="ident">libc::c_char</span>; |
| <span class="kw">if</span> <span class="kw">unsafe</span> { <span class="ident">libc::strerror_r</span>(<span class="ident">errno</span>, <span class="ident">buf_ptr</span>, <span class="ident">buf</span>.<span class="ident">len</span>()) } <span class="op">!</span><span class="op">=</span> <span class="number">0</span> { |
| <span class="kw">return</span> <span class="prelude-val">None</span>; |
| } |
| |
| <span class="comment">// Take up to trailing null byte</span> |
| <span class="kw">let</span> <span class="ident">n</span> <span class="op">=</span> <span class="ident">buf</span>.<span class="ident">len</span>(); |
| <span class="kw">let</span> <span class="ident">idx</span> <span class="op">=</span> <span class="ident">buf</span>.<span class="ident">iter</span>().<span class="ident">position</span>(<span class="op">|</span><span class="kw-2">&</span><span class="ident">b</span><span class="op">|</span> <span class="ident">b</span> <span class="op">==</span> <span class="number">0</span>).<span class="ident">unwrap_or</span>(<span class="ident">n</span>); |
| <span class="ident">core::str::from_utf8</span>(<span class="kw-2">&</span><span class="ident">buf</span>[..<span class="ident">idx</span>]).<span class="ident">ok</span>() |
| } |
| } <span class="kw">else</span> <span class="kw">if</span> <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">target_os</span> <span class="op">=</span> <span class="string">"wasi"</span>)]</span> { |
| <span class="kw">fn</span> <span class="ident">os_err</span>(<span class="ident">errno</span>: <span class="ident">i32</span>, <span class="ident">_buf</span>: <span class="kw-2">&mut</span> [<span class="ident">u8</span>]) -> <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">wasi::Error</span><span class="op">></span> { |
| <span class="ident">wasi::Error::from_raw_error</span>(<span class="ident">errno</span> <span class="kw">as</span> <span class="kw">_</span>) |
| } |
| } <span class="kw">else</span> { |
| <span class="kw">fn</span> <span class="ident">os_err</span>(<span class="ident">_errno</span>: <span class="ident">i32</span>, <span class="ident">_buf</span>: <span class="kw-2">&mut</span> [<span class="ident">u8</span>]) -> <span class="prelude-ty">Option</span><span class="op"><</span><span class="kw-2">&</span><span class="ident">str</span><span class="op">></span> { |
| <span class="prelude-val">None</span> |
| } |
| } |
| } |
| |
| <span class="kw">impl</span> <span class="ident">fmt::Debug</span> <span class="kw">for</span> <span class="ident">Error</span> { |
| <span class="kw">fn</span> <span class="ident">fmt</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">f</span>: <span class="kw-2">&mut</span> <span class="ident">fmt::Formatter</span><span class="op"><</span><span class="lifetime">'_</span><span class="op">></span>) -> <span class="ident">fmt::Result</span> { |
| <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">dbg</span> <span class="op">=</span> <span class="ident">f</span>.<span class="ident">debug_struct</span>(<span class="string">"Error"</span>); |
| <span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Some</span>(<span class="ident">errno</span>) <span class="op">=</span> <span class="self">self</span>.<span class="ident">raw_os_error</span>() { |
| <span class="ident">dbg</span>.<span class="ident">field</span>(<span class="string">"os_error"</span>, <span class="kw-2">&</span><span class="ident">errno</span>); |
| <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">buf</span> <span class="op">=</span> [<span class="number">0u8</span>; <span class="number">128</span>]; |
| <span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Some</span>(<span class="ident">err</span>) <span class="op">=</span> <span class="ident">os_err</span>(<span class="ident">errno</span>, <span class="kw-2">&mut</span> <span class="ident">buf</span>) { |
| <span class="ident">dbg</span>.<span class="ident">field</span>(<span class="string">"description"</span>, <span class="kw-2">&</span><span class="ident">err</span>); |
| } |
| } <span class="kw">else</span> <span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Some</span>(<span class="ident">desc</span>) <span class="op">=</span> <span class="ident">internal_desc</span>(<span class="kw-2">*</span><span class="self">self</span>) { |
| <span class="ident">dbg</span>.<span class="ident">field</span>(<span class="string">"internal_code"</span>, <span class="kw-2">&</span><span class="self">self</span>.<span class="number">0</span>.<span class="ident">get</span>()); |
| <span class="ident">dbg</span>.<span class="ident">field</span>(<span class="string">"description"</span>, <span class="kw-2">&</span><span class="ident">desc</span>); |
| } <span class="kw">else</span> { |
| <span class="ident">dbg</span>.<span class="ident">field</span>(<span class="string">"unknown_code"</span>, <span class="kw-2">&</span><span class="self">self</span>.<span class="number">0</span>.<span class="ident">get</span>()); |
| } |
| <span class="ident">dbg</span>.<span class="ident">finish</span>() |
| } |
| } |
| |
| <span class="kw">impl</span> <span class="ident">fmt::Display</span> <span class="kw">for</span> <span class="ident">Error</span> { |
| <span class="kw">fn</span> <span class="ident">fmt</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">f</span>: <span class="kw-2">&mut</span> <span class="ident">fmt::Formatter</span><span class="op"><</span><span class="lifetime">'_</span><span class="op">></span>) -> <span class="ident">fmt::Result</span> { |
| <span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Some</span>(<span class="ident">errno</span>) <span class="op">=</span> <span class="self">self</span>.<span class="ident">raw_os_error</span>() { |
| <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">buf</span> <span class="op">=</span> [<span class="number">0u8</span>; <span class="number">128</span>]; |
| <span class="kw">match</span> <span class="ident">os_err</span>(<span class="ident">errno</span>, <span class="kw-2">&mut</span> <span class="ident">buf</span>) { |
| <span class="prelude-val">Some</span>(<span class="ident">err</span>) => <span class="ident">err</span>.<span class="ident">fmt</span>(<span class="ident">f</span>), |
| <span class="prelude-val">None</span> => <span class="macro">write!</span>(<span class="ident">f</span>, <span class="string">"OS Error: {}"</span>, <span class="ident">errno</span>), |
| } |
| } <span class="kw">else</span> <span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Some</span>(<span class="ident">desc</span>) <span class="op">=</span> <span class="ident">internal_desc</span>(<span class="kw-2">*</span><span class="self">self</span>) { |
| <span class="ident">f</span>.<span class="ident">write_str</span>(<span class="ident">desc</span>) |
| } <span class="kw">else</span> { |
| <span class="macro">write!</span>(<span class="ident">f</span>, <span class="string">"Unknown Error: {}"</span>, <span class="self">self</span>.<span class="number">0</span>.<span class="ident">get</span>()) |
| } |
| } |
| } |
| |
| <span class="kw">impl</span> <span class="ident">From</span><span class="op"><</span><span class="ident">NonZeroU32</span><span class="op">></span> <span class="kw">for</span> <span class="ident">Error</span> { |
| <span class="kw">fn</span> <span class="ident">from</span>(<span class="ident">code</span>: <span class="ident">NonZeroU32</span>) -> <span class="self">Self</span> { |
| <span class="self">Self</span>(<span class="ident">code</span>) |
| } |
| } |
| |
| <span class="kw">fn</span> <span class="ident">internal_desc</span>(<span class="ident">error</span>: <span class="ident">Error</span>) -> <span class="prelude-ty">Option</span><span class="op"><</span><span class="kw-2">&</span><span class="lifetime">'static</span> <span class="ident">str</span><span class="op">></span> { |
| <span class="kw">match</span> <span class="ident">error</span> { |
| <span class="ident">Error::UNSUPPORTED</span> => <span class="prelude-val">Some</span>(<span class="string">"getrandom: this target is not supported"</span>), |
| <span class="ident">Error::ERRNO_NOT_POSITIVE</span> => <span class="prelude-val">Some</span>(<span class="string">"errno: did not return a positive value"</span>), |
| <span class="ident">Error::IOS_SEC_RANDOM</span> => <span class="prelude-val">Some</span>(<span class="string">"SecRandomCopyBytes: iOS Security framework failure"</span>), |
| <span class="ident">Error::WINDOWS_RTL_GEN_RANDOM</span> => <span class="prelude-val">Some</span>(<span class="string">"RtlGenRandom: Windows system function failure"</span>), |
| <span class="ident">Error::FAILED_RDRAND</span> => <span class="prelude-val">Some</span>(<span class="string">"RDRAND: failed multiple times: CPU issue likely"</span>), |
| <span class="ident">Error::NO_RDRAND</span> => <span class="prelude-val">Some</span>(<span class="string">"RDRAND: instruction not supported"</span>), |
| <span class="ident">Error::WEB_CRYPTO</span> => <span class="prelude-val">Some</span>(<span class="string">"Web Crypto API is unavailable"</span>), |
| <span class="ident">Error::WEB_GET_RANDOM_VALUES</span> => <span class="prelude-val">Some</span>(<span class="string">"Web API crypto.getRandomValues is unavailable"</span>), |
| <span class="ident">Error::VXWORKS_RAND_SECURE</span> => <span class="prelude-val">Some</span>(<span class="string">"randSecure: VxWorks RNG module is not initialized"</span>), |
| <span class="ident">Error::NODE_CRYPTO</span> => <span class="prelude-val">Some</span>(<span class="string">"Node.js crypto module is unavailable"</span>), |
| <span class="ident">Error::NODE_RANDOM_FILL_SYNC</span> => <span class="prelude-val">Some</span>(<span class="string">"Node.js API crypto.randomFillSync is unavailable"</span>), |
| <span class="kw">_</span> => <span class="prelude-val">None</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="ident"><span class="kw">super</span>::Error</span>; |
| <span class="kw">use</span> <span class="ident">core::mem::size_of</span>; |
| |
| <span class="attribute">#[<span class="ident">test</span>]</span> |
| <span class="kw">fn</span> <span class="ident">test_size</span>() { |
| <span class="macro">assert_eq!</span>(<span class="ident">size_of</span>::<span class="op"><</span><span class="ident">Error</span><span class="op">></span>(), <span class="number">4</span>); |
| <span class="macro">assert_eq!</span>(<span class="ident">size_of</span>::<span class="op"><</span><span class="prelude-ty">Result</span><span class="op"><</span>(), <span class="ident">Error</span><span class="op">></span><span class="op">></span>(), <span class="number">4</span>); |
| } |
| } |
| </code></pre></div> |
| </section><section id="search" class="content hidden"></section></div></main><div id="rustdoc-vars" data-root-path="../../" data-current-crate="getrandom" data-themes="ayu,dark,light" data-resource-suffix="" data-rustdoc-version="1.60.0-nightly (1bd4fdc94 2022-01-12)" ></div> |
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