| <!DOCTYPE html><html lang="en"><head><meta charset="utf-8"><meta name="viewport" content="width=device-width, initial-scale=1.0"><meta name="generator" content="rustdoc"><meta name="description" content="Source of the Rust file `/root/.cargo/registry/src/github.com-1ecc6299db9ec823/rustls-0.19.1/src/msgs/hsjoiner.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>hsjoiner.rs - source</title><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../SourceSerif4-Regular.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../FiraSans-Regular.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../FiraSans-Medium.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../SourceCodePro-Regular.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../SourceSerif4-Bold.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../SourceCodePro-Semibold.ttf.woff2"><link rel="stylesheet" href="../../../normalize.css"><link rel="stylesheet" href="../../../rustdoc.css" id="mainThemeStyle"><link rel="stylesheet" href="../../../ayu.css" disabled><link rel="stylesheet" href="../../../dark.css" disabled><link rel="stylesheet" href="../../../light.css" id="themeStyle"><script id="default-settings" ></script><script src="../../../storage.js"></script><script defer src="../../../source-script.js"></script><script defer src="../../../source-files.js"></script><script defer src="../../../main.js"></script><noscript><link rel="stylesheet" href="../../../noscript.css"></noscript><link rel="alternate icon" type="image/png" href="../../../favicon-16x16.png"><link rel="alternate icon" type="image/png" href="../../../favicon-32x32.png"><link rel="icon" type="image/svg+xml" href="../../../favicon.svg"></head><body class="rustdoc source"><!--[if lte IE 11]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><nav class="sidebar"><a class="sidebar-logo" href="../../../rustls/index.html"><div class="logo-container"><img class="rust-logo" src="../../../rust-logo.svg" alt="logo"></div></a></nav><main><div class="width-limiter"><nav class="sub"><a class="sub-logo-container" href="../../../rustls/index.html"><img class="rust-logo" src="../../../rust-logo.svg" alt="logo"></a><form class="search-form"><div class="search-container"><span></span><input class="search-input" name="search" autocomplete="off" spellcheck="false" placeholder="Click or press ‘S’ to search, ‘?’ for more options…" type="search"><div id="help-button" title="help" tabindex="-1"><a href="../../../help.html">?</a></div><div id="settings-menu" tabindex="-1"><a href="../../../settings.html" title="settings"><img width="22" height="22" alt="Change settings" src="../../../wheel.svg"></a></div></div></form></nav><section id="main-content" class="content"><div class="example-wrap"><pre class="src-line-numbers"><span id="1">1</span> |
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| </pre><pre class="rust"><code><span class="kw">use </span>std::collections::VecDeque; |
| |
| <span class="kw">use </span><span class="kw">crate</span>::msgs::codec; |
| <span class="kw">use </span><span class="kw">crate</span>::msgs::enums::{ContentType, ProtocolVersion}; |
| <span class="kw">use </span><span class="kw">crate</span>::msgs::handshake::HandshakeMessagePayload; |
| <span class="kw">use </span><span class="kw">crate</span>::msgs::message::{Message, MessagePayload}; |
| |
| <span class="kw">const </span>HEADER_SIZE: usize = <span class="number">1 </span>+ <span class="number">3</span>; |
| |
| <span class="doccomment">/// This works to reconstruct TLS handshake messages |
| /// from individual TLS messages. It's guaranteed that |
| /// TLS messages output from this layer contain precisely |
| /// one handshake payload. |
| </span><span class="kw">pub struct </span>HandshakeJoiner { |
| <span class="doccomment">/// Completed handshake frames for output. |
| </span><span class="kw">pub </span>frames: VecDeque<Message>, |
| |
| <span class="doccomment">/// The message payload we're currently accumulating. |
| </span>buf: Vec<u8>, |
| } |
| |
| <span class="kw">impl </span>Default <span class="kw">for </span>HandshakeJoiner { |
| <span class="kw">fn </span>default() -> <span class="self">Self </span>{ |
| <span class="self">Self</span>::new() |
| } |
| } |
| |
| <span class="kw">impl </span>HandshakeJoiner { |
| <span class="doccomment">/// Make a new HandshakeJoiner. |
| </span><span class="kw">pub fn </span>new() -> HandshakeJoiner { |
| HandshakeJoiner { |
| frames: VecDeque::new(), |
| buf: Vec::new(), |
| } |
| } |
| |
| <span class="doccomment">/// Do we want to process this message? |
| </span><span class="kw">pub fn </span>want_message(<span class="kw-2">&</span><span class="self">self</span>, msg: <span class="kw-2">&</span>Message) -> bool { |
| msg.is_content_type(ContentType::Handshake) |
| } |
| |
| <span class="doccomment">/// Do we have any buffered data? |
| </span><span class="kw">pub fn </span>is_empty(<span class="kw-2">&</span><span class="self">self</span>) -> bool { |
| <span class="self">self</span>.buf.is_empty() |
| } |
| |
| <span class="doccomment">/// Take the message, and join/split it as needed. |
| /// Return the number of new messages added to the |
| /// output deque as a result of this message. |
| /// |
| /// Returns None if msg or a preceding message was corrupt. |
| /// You cannot recover from this situation. Otherwise returns |
| /// a count of how many messages we queued. |
| </span><span class="kw">pub fn </span>take_message(<span class="kw-2">&mut </span><span class="self">self</span>, <span class="kw-2">mut </span>msg: Message) -> <span class="prelude-ty">Option</span><usize> { |
| <span class="comment">// Input must be opaque, otherwise we might have already |
| // lost information! |
| </span><span class="kw">let </span>payload = msg.take_opaque_payload().unwrap(); |
| |
| <span class="self">self</span>.buf |
| .extend_from_slice(<span class="kw-2">&</span>payload.<span class="number">0</span>[..]); |
| |
| <span class="kw">let </span><span class="kw-2">mut </span>count = <span class="number">0</span>; |
| <span class="kw">while </span><span class="self">self</span>.buf_contains_message() { |
| <span class="kw">if </span>!<span class="self">self</span>.deframe_one(msg.version) { |
| <span class="kw">return </span><span class="prelude-val">None</span>; |
| } |
| |
| count += <span class="number">1</span>; |
| } |
| |
| <span class="prelude-val">Some</span>(count) |
| } |
| |
| <span class="doccomment">/// Does our `buf` contain a full handshake payload? It does if it is big |
| /// enough to contain a header, and that header has a length which falls |
| /// within `buf`. |
| </span><span class="kw">fn </span>buf_contains_message(<span class="kw-2">&</span><span class="self">self</span>) -> bool { |
| <span class="self">self</span>.buf.len() >= HEADER_SIZE |
| && <span class="self">self</span>.buf.len() |
| >= (codec::u24::decode(<span class="kw-2">&</span><span class="self">self</span>.buf[<span class="number">1</span>..<span class="number">4</span>]) |
| .unwrap() |
| .<span class="number">0 </span><span class="kw">as </span>usize) |
| + HEADER_SIZE |
| } |
| |
| <span class="doccomment">/// Take a TLS handshake payload off the front of `buf`, and put it onto |
| /// the back of our `frames` deque inside a normal `Message`. |
| /// |
| /// Returns false if the stream is desynchronised beyond repair. |
| </span><span class="kw">fn </span>deframe_one(<span class="kw-2">&mut </span><span class="self">self</span>, version: ProtocolVersion) -> bool { |
| <span class="kw">let </span>used = { |
| <span class="kw">let </span><span class="kw-2">mut </span>rd = codec::Reader::init(<span class="kw-2">&</span><span class="self">self</span>.buf); |
| <span class="kw">let </span>payload = HandshakeMessagePayload::read_version(<span class="kw-2">&mut </span>rd, version); |
| |
| <span class="kw">if </span>payload.is_none() { |
| <span class="kw">return </span><span class="bool-val">false</span>; |
| } |
| |
| <span class="kw">let </span>m = Message { |
| typ: ContentType::Handshake, |
| version, |
| payload: MessagePayload::Handshake(payload.unwrap()), |
| }; |
| |
| <span class="self">self</span>.frames.push_back(m); |
| rd.used() |
| }; |
| <span class="self">self</span>.buf = <span class="self">self</span>.buf.split_off(used); |
| <span class="bool-val">true |
| </span>} |
| } |
| |
| <span class="attribute">#[cfg(test)] |
| </span><span class="kw">mod </span>tests { |
| <span class="kw">use </span><span class="kw">super</span>::HandshakeJoiner; |
| <span class="kw">use </span><span class="kw">crate</span>::msgs::base::Payload; |
| <span class="kw">use </span><span class="kw">crate</span>::msgs::enums::{ContentType, HandshakeType, ProtocolVersion}; |
| <span class="kw">use </span><span class="kw">crate</span>::msgs::handshake::{HandshakeMessagePayload, HandshakePayload}; |
| <span class="kw">use </span><span class="kw">crate</span>::msgs::message::{Message, MessagePayload}; |
| |
| <span class="attribute">#[test] |
| </span><span class="kw">fn </span>want() { |
| <span class="kw">let </span>hj = HandshakeJoiner::new(); |
| <span class="macro">assert_eq!</span>(hj.is_empty(), <span class="bool-val">true</span>); |
| |
| <span class="kw">let </span>wanted = Message { |
| typ: ContentType::Handshake, |
| version: ProtocolVersion::TLSv1_2, |
| payload: MessagePayload::new_opaque(<span class="string">b"hello world"</span>.to_vec()), |
| }; |
| |
| <span class="kw">let </span>unwanted = Message { |
| typ: ContentType::Alert, |
| version: ProtocolVersion::TLSv1_2, |
| payload: MessagePayload::new_opaque(<span class="string">b"ponytown"</span>.to_vec()), |
| }; |
| |
| <span class="macro">assert_eq!</span>(hj.want_message(<span class="kw-2">&</span>wanted), <span class="bool-val">true</span>); |
| <span class="macro">assert_eq!</span>(hj.want_message(<span class="kw-2">&</span>unwanted), <span class="bool-val">false</span>); |
| } |
| |
| <span class="kw">fn </span>pop_eq(expect: <span class="kw-2">&</span>Message, hj: <span class="kw-2">&mut </span>HandshakeJoiner) { |
| <span class="kw">let </span>got = hj.frames.pop_front().unwrap(); |
| <span class="macro">assert_eq!</span>(got.typ, expect.typ); |
| <span class="macro">assert_eq!</span>(got.version, expect.version); |
| |
| <span class="kw">let </span>(<span class="kw-2">mut </span>left, <span class="kw-2">mut </span>right) = (Vec::new(), Vec::new()); |
| got.payload.encode(<span class="kw-2">&mut </span>left); |
| expect.payload.encode(<span class="kw-2">&mut </span>right); |
| |
| <span class="macro">assert_eq!</span>(left, right); |
| } |
| |
| <span class="attribute">#[test] |
| </span><span class="kw">fn </span>split() { |
| <span class="comment">// Check we split two handshake messages within one PDU. |
| </span><span class="kw">let </span><span class="kw-2">mut </span>hj = HandshakeJoiner::new(); |
| |
| <span class="comment">// two HelloRequests |
| </span><span class="kw">let </span>msg = Message { |
| typ: ContentType::Handshake, |
| version: ProtocolVersion::TLSv1_2, |
| payload: MessagePayload::new_opaque(<span class="string">b"\x00\x00\x00\x00\x00\x00\x00\x00"</span>.to_vec()), |
| }; |
| |
| <span class="macro">assert_eq!</span>(hj.want_message(<span class="kw-2">&</span>msg), <span class="bool-val">true</span>); |
| <span class="macro">assert_eq!</span>(hj.take_message(msg), <span class="prelude-val">Some</span>(<span class="number">2</span>)); |
| <span class="macro">assert_eq!</span>(hj.is_empty(), <span class="bool-val">true</span>); |
| |
| <span class="kw">let </span>expect = Message { |
| typ: ContentType::Handshake, |
| version: ProtocolVersion::TLSv1_2, |
| payload: MessagePayload::Handshake(HandshakeMessagePayload { |
| typ: HandshakeType::HelloRequest, |
| payload: HandshakePayload::HelloRequest, |
| }), |
| }; |
| |
| pop_eq(<span class="kw-2">&</span>expect, <span class="kw-2">&mut </span>hj); |
| pop_eq(<span class="kw-2">&</span>expect, <span class="kw-2">&mut </span>hj); |
| } |
| |
| <span class="attribute">#[test] |
| </span><span class="kw">fn </span>broken() { |
| <span class="comment">// Check obvious crap payloads are reported as errors, not panics. |
| </span><span class="kw">let </span><span class="kw-2">mut </span>hj = HandshakeJoiner::new(); |
| |
| <span class="comment">// short ClientHello |
| </span><span class="kw">let </span>msg = Message { |
| typ: ContentType::Handshake, |
| version: ProtocolVersion::TLSv1_2, |
| payload: MessagePayload::new_opaque(<span class="string">b"\x01\x00\x00\x02\xff\xff"</span>.to_vec()), |
| }; |
| |
| <span class="macro">assert_eq!</span>(hj.want_message(<span class="kw-2">&</span>msg), <span class="bool-val">true</span>); |
| <span class="macro">assert_eq!</span>(hj.take_message(msg), <span class="prelude-val">None</span>); |
| } |
| |
| <span class="attribute">#[test] |
| </span><span class="kw">fn </span>join() { |
| <span class="comment">// Check we join one handshake message split over two PDUs. |
| </span><span class="kw">let </span><span class="kw-2">mut </span>hj = HandshakeJoiner::new(); |
| <span class="macro">assert_eq!</span>(hj.is_empty(), <span class="bool-val">true</span>); |
| |
| <span class="comment">// Introduce Finished of 16 bytes, providing 4. |
| </span><span class="kw">let </span><span class="kw-2">mut </span>msg = Message { |
| typ: ContentType::Handshake, |
| version: ProtocolVersion::TLSv1_2, |
| payload: MessagePayload::new_opaque(<span class="string">b"\x14\x00\x00\x10\x00\x01\x02\x03\x04"</span>.to_vec()), |
| }; |
| |
| <span class="macro">assert_eq!</span>(hj.want_message(<span class="kw-2">&</span>msg), <span class="bool-val">true</span>); |
| <span class="macro">assert_eq!</span>(hj.take_message(msg), <span class="prelude-val">Some</span>(<span class="number">0</span>)); |
| <span class="macro">assert_eq!</span>(hj.is_empty(), <span class="bool-val">false</span>); |
| |
| <span class="comment">// 11 more bytes. |
| </span>msg = Message { |
| typ: ContentType::Handshake, |
| version: ProtocolVersion::TLSv1_2, |
| payload: MessagePayload::new_opaque( |
| <span class="string">b"\x05\x06\x07\x08\x09\x0a\x0b\x0c\x0d\x0e"</span>.to_vec(), |
| ), |
| }; |
| |
| <span class="macro">assert_eq!</span>(hj.want_message(<span class="kw-2">&</span>msg), <span class="bool-val">true</span>); |
| <span class="macro">assert_eq!</span>(hj.take_message(msg), <span class="prelude-val">Some</span>(<span class="number">0</span>)); |
| <span class="macro">assert_eq!</span>(hj.is_empty(), <span class="bool-val">false</span>); |
| |
| <span class="comment">// Final 1 byte. |
| </span>msg = Message { |
| typ: ContentType::Handshake, |
| version: ProtocolVersion::TLSv1_2, |
| payload: MessagePayload::new_opaque(<span class="string">b"\x0f"</span>.to_vec()), |
| }; |
| |
| <span class="macro">assert_eq!</span>(hj.want_message(<span class="kw-2">&</span>msg), <span class="bool-val">true</span>); |
| <span class="macro">assert_eq!</span>(hj.take_message(msg), <span class="prelude-val">Some</span>(<span class="number">1</span>)); |
| <span class="macro">assert_eq!</span>(hj.is_empty(), <span class="bool-val">true</span>); |
| |
| <span class="kw">let </span>payload = <span class="string">b"\x00\x01\x02\x03\x04\x05\x06\x07\x08\x09\x0a\x0b\x0c\x0d\x0e\x0f"</span>.to_vec(); |
| <span class="kw">let </span>expect = Message { |
| typ: ContentType::Handshake, |
| version: ProtocolVersion::TLSv1_2, |
| payload: MessagePayload::Handshake(HandshakeMessagePayload { |
| typ: HandshakeType::Finished, |
| payload: HandshakePayload::Finished(Payload::new(payload)), |
| }), |
| }; |
| |
| pop_eq(<span class="kw-2">&</span>expect, <span class="kw-2">&mut </span>hj); |
| } |
| |
| <span class="attribute">#[test] |
| </span><span class="kw">fn </span>test_rejoins_then_rejects_giant_certs() { |
| <span class="kw">let </span><span class="kw-2">mut </span>hj = HandshakeJoiner::new(); |
| <span class="kw">let </span>msg = Message { |
| typ: ContentType::Handshake, |
| version: ProtocolVersion::TLSv1_2, |
| payload: MessagePayload::new_opaque( |
| <span class="string">b"\x0b\x01\x00\x04\x01\x00\x01\x00\xff\xfe"</span>.to_vec(), |
| ), |
| }; |
| |
| <span class="macro">assert_eq!</span>(hj.want_message(<span class="kw-2">&</span>msg), <span class="bool-val">true</span>); |
| <span class="macro">assert_eq!</span>(hj.take_message(msg), <span class="prelude-val">Some</span>(<span class="number">0</span>)); |
| <span class="macro">assert_eq!</span>(hj.is_empty(), <span class="bool-val">false</span>); |
| |
| <span class="kw">for </span>_i <span class="kw">in </span><span class="number">0</span>..<span class="number">8191 </span>{ |
| <span class="kw">let </span>msg = Message { |
| typ: ContentType::Handshake, |
| version: ProtocolVersion::TLSv1_2, |
| payload: MessagePayload::new_opaque(<span class="string">b"\x01\x02\x03\x04\x05\x06\x07\x08"</span>.to_vec()), |
| }; |
| |
| <span class="macro">assert_eq!</span>(hj.want_message(<span class="kw-2">&</span>msg), <span class="bool-val">true</span>); |
| <span class="macro">assert_eq!</span>(hj.take_message(msg), <span class="prelude-val">Some</span>(<span class="number">0</span>)); |
| <span class="macro">assert_eq!</span>(hj.is_empty(), <span class="bool-val">false</span>); |
| } |
| |
| <span class="comment">// final 6 bytes |
| </span><span class="kw">let </span>msg = Message { |
| typ: ContentType::Handshake, |
| version: ProtocolVersion::TLSv1_2, |
| payload: MessagePayload::new_opaque(<span class="string">b"\x01\x02\x03\x04\x05\x06"</span>.to_vec()), |
| }; |
| |
| <span class="macro">assert_eq!</span>(hj.want_message(<span class="kw-2">&</span>msg), <span class="bool-val">true</span>); |
| <span class="macro">assert_eq!</span>(hj.take_message(msg), <span class="prelude-val">None</span>); |
| } |
| } |
| </code></pre></div> |
| </section></div></main><div id="rustdoc-vars" data-root-path="../../../" data-current-crate="rustls" data-themes="ayu,dark,light" data-resource-suffix="" data-rustdoc-version="1.66.0-nightly (5c8bff74b 2022-10-21)" ></div></body></html> |
