71 lines
1.8 KiB
Rust
71 lines
1.8 KiB
Rust
use std::fmt::Formatter;
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use std::fs::{File, OpenOptions};
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use std::io::Write;
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use std::path::Path;
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use std::sync::Mutex;
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use std::{fmt, io};
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// Internal mutable state for KeyLogFile
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struct KeyLogFileInner {
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file: File,
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buf: Vec<u8>,
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}
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impl fmt::Debug for KeyLogFileInner {
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fn fmt(&self, f: &mut Formatter<'_>) -> fmt::Result {
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fmt::Debug::fmt(&self.file, f)
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}
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}
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impl KeyLogFileInner {
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fn new(path: impl AsRef<Path>) -> io::Result<Self> {
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let file = OpenOptions::new().append(true).create(true).open(path)?;
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Ok(Self {
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file,
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buf: Vec::new(),
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})
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}
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fn try_write(&mut self, label: &str, client_random: &[u8], secret: &[u8]) -> io::Result<()> {
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self.buf.truncate(0);
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write!(self.buf, "{} ", label)?;
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for b in client_random.iter() {
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write!(self.buf, "{:02x}", b)?;
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}
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write!(self.buf, " ")?;
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for b in secret.iter() {
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write!(self.buf, "{:02x}", b)?;
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}
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writeln!(self.buf)?;
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self.file.write_all(&self.buf)
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}
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}
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#[derive(Debug)]
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/// [`KeyLog`] implementation that opens a file at the given path
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pub struct KeyLogFile(Mutex<KeyLogFileInner>);
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impl KeyLogFile {
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/// Makes a new `KeyLogFile`. The environment variable is
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/// inspected and the named file is opened during this call.
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pub fn new(path: impl AsRef<Path>) -> io::Result<Self> {
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Ok(Self(Mutex::new(KeyLogFileInner::new(path)?)))
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}
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}
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impl rustls::KeyLog for KeyLogFile {
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fn log(&self, label: &str, client_random: &[u8], secret: &[u8]) {
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match self
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.0
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.lock()
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.unwrap()
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.try_write(label, client_random, secret)
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{
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Ok(()) => {}
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Err(e) => {
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tracing::warn!("error writing to key log file: {}", e);
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}
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}
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}
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}
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