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436 lines
13 KiB
Rust
436 lines
13 KiB
Rust
//! phetch's Gopher library contains a few phetch-specific features:
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//! the ability to make requests or downloads over TLS or Tor,
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//! cleaning Unicode control characters from Gopher responses, and
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//! URL parsing that recognizes different protocols like telnet and
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//! IPv6 addresses.
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use std::{
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io::{Read, Result, Write},
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net::TcpStream,
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net::ToSocketAddrs,
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os::unix::fs::OpenOptionsExt,
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time::Duration,
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};
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use termion::input::TermRead;
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#[cfg(feature = "tor")]
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use tor_stream::TorStream;
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#[cfg(feature = "tls")]
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use native_tls::TlsConnector;
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mod r#type;
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pub use self::r#type::Type;
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/// Some Gopher servers can be kind of slow, we may want to up this or
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/// make it configurable eventually.
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pub const TCP_TIMEOUT_IN_SECS: u64 = 8;
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/// Based on `TCP_TIMEOUT_IN_SECS` but a `Duration` type.
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pub const TCP_TIMEOUT_DURATION: Duration = Duration::from_secs(TCP_TIMEOUT_IN_SECS);
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trait ReadWrite: Read + Write {}
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impl<T: Read + Write> ReadWrite for T {}
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/// Wrapper for TLS and regular TCP streams.
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pub struct Stream {
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io: Box<dyn ReadWrite>,
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tls: bool,
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}
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impl Stream {
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fn is_tls(&self) -> bool {
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self.tls
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}
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}
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impl Read for Stream {
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fn read(&mut self, buf: &mut [u8]) -> Result<usize> {
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self.io.read(buf)
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}
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}
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impl Write for Stream {
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fn write(&mut self, buf: &[u8]) -> Result<usize> {
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self.io.write(buf)
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}
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fn flush(&mut self) -> Result<()> {
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self.io.flush()
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}
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}
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/// Gopher URL. Returned by `parse_url()`.
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pub struct Url<'a> {
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/// Gopher Type
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pub typ: Type,
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/// Hostname
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pub host: &'a str,
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/// Port. Defaults to 70
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pub port: &'a str,
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/// Selector
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pub sel: &'a str,
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}
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/// Fetches a gopher URL and returns a tuple of:
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/// (did tls work?, raw Gopher response)
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pub fn fetch_url(url: &str, tls: bool, tor: bool) -> Result<(bool, String)> {
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let u = parse_url(url);
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fetch(u.host, u.port, u.sel, tls, tor)
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}
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/// Fetches a gopher URL by its component parts and returns a tuple of:
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/// (did tls work?, raw Gopher response)
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pub fn fetch(
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host: &str,
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port: &str,
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selector: &str,
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tls: bool,
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tor: bool,
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) -> Result<(bool, String)> {
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let mut stream = request(host, port, selector, tls, tor)?;
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let mut body = Vec::new();
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stream.read_to_end(&mut body)?;
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let out = clean_response(&String::from_utf8_lossy(&body));
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Ok((stream.is_tls(), out))
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}
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/// Removes unprintable characters from Gopher response.
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/// https://en.wikipedia.org/wiki/Control_character#In_Unicode
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fn clean_response(res: &str) -> String {
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res.chars()
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.map(|c| match c {
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'\u{007F}' => '?',
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_ if c >= '\u{0080}' && c <= '\u{009F}' => '?',
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c => c,
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})
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.collect()
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}
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/// Downloads a binary to disk. Allows canceling with Ctrl-c.
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/// Returns a tuple of:
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/// (path it was saved to, the size in bytes)
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pub fn download_url(url: &str, tls: bool, tor: bool) -> Result<(String, usize)> {
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let u = parse_url(url);
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let filename = u
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.sel
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.split_terminator('/')
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.rev()
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.nth(0)
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.ok_or_else(|| error!("Bad download filename: {}", u.sel))?;
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let mut path = std::path::PathBuf::from(".");
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path.push(filename);
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let stdin = termion::async_stdin();
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let mut keys = stdin.keys();
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let mut stream = request(u.host, u.port, u.sel, tls, tor)?;
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let mut file = std::fs::OpenOptions::new()
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.write(true)
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.create(true)
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.truncate(true)
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.mode(0o770)
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.open(path)?;
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let mut buf = [0; 1024];
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let mut bytes = 0;
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while let Ok(count) = stream.read(&mut buf) {
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if count == 0 {
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break;
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}
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bytes += count;
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file.write_all(&buf[..count])?;
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if let Some(Ok(termion::event::Key::Ctrl('c'))) = keys.next() {
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return Err(error!("Download cancelled"));
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}
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}
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Ok((filename.to_string(), bytes))
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}
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/// Make a Gopher request and return a TcpStream ready to be read()'d.
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/// Will attempt a TLS connection first, then retry a regular
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/// connection if it fails.
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pub fn request(host: &str, port: &str, selector: &str, tls: bool, tor: bool) -> Result<Stream> {
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let selector = selector.replace('?', "\t"); // search queries
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let sock = format!("{}:{}", host, port)
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.to_socket_addrs()
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.and_then(|mut socks| socks.next().ok_or_else(|| error!("Can't create socket")))?;
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// attempt tls connection
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if tls {
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#[cfg(feature = "tls")]
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{
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{
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if let Ok(connector) = TlsConnector::new() {
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let stream = TcpStream::connect_timeout(&sock, TCP_TIMEOUT_DURATION)?;
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stream.set_read_timeout(Some(TCP_TIMEOUT_DURATION))?;
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if let Ok(mut stream) = connector.connect(host, stream) {
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stream.write_all(selector.as_ref())?;
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stream.write_all("\r\n".as_ref())?;
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return Ok(Stream {
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io: Box::new(stream),
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tls: true,
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});
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}
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}
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}
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}
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}
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// tls didn't work or wasn't selected, try Tor or default
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if tor {
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#[cfg(feature = "tor")]
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{
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let proxy = std::env::var("TOR_PROXY")
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.unwrap_or_else(|_| "127.0.0.1:9050".into())
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.to_socket_addrs()?
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.nth(0)
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.unwrap();
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let mut stream = match TorStream::connect_with_address(proxy, sock) {
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Ok(s) => s,
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Err(e) => return Err(error!("Tor error: {}", e)),
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};
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stream.write_all(selector.as_ref())?;
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stream.write_all("\r\n".as_ref())?;
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return Ok(Stream {
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io: Box::new(stream),
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tls: false,
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});
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}
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}
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// no tls or tor, try regular connection
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let mut stream = TcpStream::connect_timeout(&sock, TCP_TIMEOUT_DURATION)?;
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stream.set_read_timeout(Some(TCP_TIMEOUT_DURATION))?;
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stream.write_all(selector.as_ref())?;
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stream.write_all("\r\n".as_ref())?;
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Ok(Stream {
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io: Box::new(stream),
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tls: false,
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})
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}
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impl<'a> Url<'a> {
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/// Creates a new Gopher Url quickly from a tuple of Url fields.
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pub fn new(typ: Type, host: &'a str, port: &'a str, sel: &'a str) -> Url<'a> {
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Url {
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typ,
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host,
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port,
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sel,
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}
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}
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}
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/// Given a Gopher URL, returns a gopher::Type.
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pub fn type_for_url(url: &str) -> Type {
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if url.starts_with("telnet://") {
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return Type::Telnet;
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}
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if url.starts_with("URL:") || url.starts_with("/URL:") {
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return Type::HTML;
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}
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if let Some(idx) = url.find('/') {
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if let Some(t) = url.chars().nth(idx + 1) {
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return Type::from(t).unwrap_or(Type::Menu);
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}
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}
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Type::Menu
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}
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/// Parses gopher URL into parts.
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/// Returns (Type, host, port, sel)
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pub fn parse_url(url: &str) -> Url {
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let mut url = url.trim_start_matches("gopher://");
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let mut typ = Type::Menu;
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let mut host;
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let mut port = "70";
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let mut sel = "";
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// simple URLs, ex: "dog.com"
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if !url.contains(':') && !url.contains('/') {
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return Url::new(Type::Menu, url, "70", "");
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}
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// telnet urls
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if url.starts_with("telnet://") {
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typ = Type::Telnet;
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url = url.trim_start_matches("telnet://");
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} else if url.contains("://") {
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// non-gopher URLs, stick everything in selector
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return Url::new(Type::HTML, "", "", url);
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}
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// check selector first
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if let Some(idx) = url.find('/') {
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host = &url[..idx];
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sel = &url[idx..];
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} else {
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host = &url;
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}
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// ipv6
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if let Some(idx) = host.find('[') {
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if let Some(end) = host[idx + 1..].find(']') {
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host = &host[idx + 1..=end];
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if host.len() > end {
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if let Some(idx) = host[end..].find(':') {
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port = &host[idx + 1..];
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}
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}
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} else {
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return Url::new(Type::Error, "Unclosed ipv6 bracket", "", url);
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}
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} else if let Some(idx) = host.find(':') {
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// two :'s == probably ipv6
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if host.len() > idx + 1 && !host[idx + 1..].contains(':') {
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// regular hostname w/ port -- grab port
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port = &host[idx + 1..];
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host = &host[..idx];
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}
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}
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// ignore type prefix on selector
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if typ != Type::Telnet {
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let mut chars = sel.chars();
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if let (Some('/'), Some(c)) = (chars.nth(0), chars.nth(0)) {
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if let Some(t) = Type::from(c) {
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typ = t;
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sel = &sel[2..];
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}
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}
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}
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Url::new(typ, host, port, sel)
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}
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#[cfg(test)]
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mod tests {
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use super::*;
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#[test]
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fn test_simple_parse() {
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let urls = vec![
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"gopher://gopher.club/1/phlogs/",
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"gopher://sdf.org:7777/1/maps",
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"gopher.floodgap.org",
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"gopher.floodgap.com/0/gopher/relevance.txt",
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"gopher://gopherpedia.com/7/lookup?Gopher",
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"gopher://dead:beef:1234:5678:9012:3456:feed:deed",
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"gopher://[1234:2345:dead:4567:7890:1234:beef:1111]:7443/1/files",
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"gopher://2001:cdba:0000:0000:0000:0000:3257:9121",
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"[2001:cdba::3257:9652]",
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"gopher://9999:aaaa::abab:baba:aaaa:9999",
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"[2001:2099:dead:beef:0000",
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"::1",
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"ssh://kiosk@bitreich.org",
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"https://github.com/xvxx/phetch",
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"telnet://bbs.impakt.net:6502/",
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];
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let url = parse_url(urls[0]);
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assert_eq!(url.typ, Type::Menu);
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assert_eq!(url.host, "gopher.club");
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assert_eq!(url.port, "70");
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assert_eq!(url.sel, "/phlogs/");
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let url = parse_url(urls[1]);
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assert_eq!(url.typ, Type::Menu);
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assert_eq!(url.host, "sdf.org");
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assert_eq!(url.port, "7777");
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assert_eq!(url.sel, "/maps");
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let url = parse_url(urls[2]);
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assert_eq!(url.typ, Type::Menu);
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assert_eq!(url.host, "gopher.floodgap.org");
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assert_eq!(url.port, "70");
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assert_eq!(url.sel, "");
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let url = parse_url(urls[3]);
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assert_eq!(url.typ, Type::Text);
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assert_eq!(url.host, "gopher.floodgap.com");
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assert_eq!(url.port, "70");
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assert_eq!(url.sel, "/gopher/relevance.txt");
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let url = parse_url(urls[4]);
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assert_eq!(url.typ, Type::Search);
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assert_eq!(url.host, "gopherpedia.com");
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assert_eq!(url.port, "70");
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assert_eq!(url.sel, "/lookup?Gopher");
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let url = parse_url(urls[5]);
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assert_eq!(url.typ, Type::Menu);
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assert_eq!(url.host, "dead:beef:1234:5678:9012:3456:feed:deed");
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assert_eq!(url.port, "70");
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assert_eq!(url.sel, "");
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let url = parse_url(urls[6]);
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assert_eq!(url.typ, Type::Menu);
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assert_eq!(url.host, "1234:2345:dead:4567:7890:1234:beef:1111");
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assert_eq!(url.port, "70");
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assert_eq!(url.sel, "/files");
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let url = parse_url(urls[7]);
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assert_eq!(url.typ, Type::Menu);
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assert_eq!(url.host, "2001:cdba:0000:0000:0000:0000:3257:9121");
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assert_eq!(url.port, "70");
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assert_eq!(url.sel, "");
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let url = parse_url(urls[8]);
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assert_eq!(url.typ, Type::Menu);
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assert_eq!(url.host, "2001:cdba::3257:9652");
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assert_eq!(url.port, "70");
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assert_eq!(url.sel, "");
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let url = parse_url(urls[9]);
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assert_eq!(url.typ, Type::Menu);
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assert_eq!(url.host, "9999:aaaa::abab:baba:aaaa:9999");
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assert_eq!(url.port, "70");
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assert_eq!(url.sel, "");
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let url = parse_url(urls[10]);
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assert_eq!(url.typ, Type::Error);
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assert_eq!(url.host, "Unclosed ipv6 bracket");
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assert_eq!(url.port, "");
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assert_eq!(url.sel, "[2001:2099:dead:beef:0000");
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let url = parse_url(urls[11]);
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assert_eq!(url.typ, Type::Menu);
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assert_eq!(url.host, "::1");
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assert_eq!(url.port, "70");
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assert_eq!(url.sel, "");
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let url = parse_url(urls[12]);
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assert_eq!(url.typ, Type::HTML);
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assert_eq!(url.host, "");
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assert_eq!(url.port, "");
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assert_eq!(url.sel, "ssh://kiosk@bitreich.org");
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let url = parse_url(urls[13]);
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assert_eq!(url.typ, Type::HTML);
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assert_eq!(url.host, "");
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assert_eq!(url.port, "");
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assert_eq!(url.sel, "https://github.com/xvxx/phetch");
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let url = parse_url(urls[14]);
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assert_eq!(url.typ, Type::Telnet);
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assert_eq!(url.host, "bbs.impakt.net");
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assert_eq!(url.port, "6502");
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assert_eq!(url.sel, "/");
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}
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#[test]
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fn test_type_for_url() {
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assert_eq!(type_for_url("phkt.io"), Type::Menu);
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assert_eq!(type_for_url("phkt.io/1"), Type::Menu);
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assert_eq!(type_for_url("phkt.io/1/"), Type::Menu);
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assert_eq!(type_for_url("phkt.io/0/info.txt"), Type::Text);
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assert_eq!(type_for_url("URL:https://google.com"), Type::HTML);
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assert_eq!(
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type_for_url("telnet://bbs.inter.net:6502/connect"),
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Type::Telnet
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);
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}
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}
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