fix(http1): return 414 when URI contains more than 65534 characters

Previous behavior returned a 404 Bad Request. Conforms to HTTP 1.1 RFC.

Closes hyperium#2701

src/error.rs

@@ -71,6 +71,7 @@ pub(super) enum Parse {
     #[cfg(feature = "http1")]
     VersionH2,
     Uri,
+    UriTooLong,
     Header(Header),
     TooLarge,
     Status,
@@ -152,7 +153,7 @@ impl Error {
 
     /// Returns true if this was an HTTP parse error caused by a message that was too large.
     pub fn is_parse_too_large(&self) -> bool {
-        matches!(self.inner.kind, Kind::Parse(Parse::TooLarge))
+        matches!(self.inner.kind, Kind::Parse(Parse::TooLarge) | Kind::Parse(Parse::UriTooLong))
     }
 
     /// Returns true if this was an HTTP parse error caused by an invalid response status code or
@@ -398,6 +399,7 @@ impl Error {
             #[cfg(feature = "http1")]
             Kind::Parse(Parse::VersionH2) => "invalid HTTP version parsed (found HTTP2 preface)",
             Kind::Parse(Parse::Uri) => "invalid URI",
+            Kind::Parse(Parse::UriTooLong) => "URI too long",
             Kind::Parse(Parse::Header(Header::Token)) => "invalid HTTP header parsed",
             #[cfg(feature = "http1")]
             Kind::Parse(Parse::Header(Header::ContentLengthInvalid)) => {

src/proto/h1/role.rs

@@ -25,6 +25,7 @@ use crate::proto::{BodyLength, MessageHead, RequestHead, RequestLine};
 
 const MAX_HEADERS: usize = 100;
 const AVERAGE_HEADER_SIZE: usize = 30; // totally scientific
+const MAX_URI_LEN: usize = (u16::MAX - 1) as usize;
 
 macro_rules! header_name {
     ($bytes:expr) => {{
@@ -148,9 +149,13 @@ impl Http1Transaction for Server {
                 Ok(httparse::Status::Complete(parsed_len)) => {
                     trace!("Request.parse Complete({})", parsed_len);
                     len = parsed_len;
+                    let uri = req.path.unwrap();
+                    if uri.len() > MAX_URI_LEN {
+                        return Err(Parse::UriTooLong);
+                    }
                     subject = RequestLine(
                         Method::from_bytes(req.method.unwrap().as_bytes())?,
-                        req.path.unwrap().parse()?,
+                        uri.parse()?,
                     );
                     version = if req.version.unwrap() == 1 {
                         keep_alive = true;
@@ -408,6 +413,7 @@ impl Http1Transaction for Server {
             | Kind::Parse(Parse::Uri)
             | Kind::Parse(Parse::Version) => StatusCode::BAD_REQUEST,
             Kind::Parse(Parse::TooLarge) => StatusCode::REQUEST_HEADER_FIELDS_TOO_LARGE,
+            Kind::Parse(Parse::UriTooLong) => StatusCode::URI_TOO_LONG,
             _ => return None,
         };
 

tests/server.rs

@@ -1025,6 +1025,23 @@ fn http_10_request_receives_http_10_response() {
     assert_eq!(s(&buf[..expected.len()]), expected);
 }
 
+#[test]
+fn http_11_uri_too_long() {
+    let server = serve();
+
+    let long_path = "a".repeat(65534);
+    let request_line = format!("GET /{} HTTP/1.1\r\n\r\n", long_path);
+
+    let mut req = connect(server.addr());
+    req.write_all(request_line.as_bytes()).unwrap();
+
+    let expected = "HTTP/1.1 414 URI Too Long\r\ncontent-length: 0\r\n";
+    let mut buf = [0; 256];
+    let n = req.read(&mut buf).unwrap();
+    assert!(n >= expected.len(), "read: {:?} >= {:?}", n, expected.len());
+    assert_eq!(s(&buf[..expected.len()]), expected);
+}
+
 #[tokio::test]
 async fn disable_keep_alive_mid_request() {
     let listener = tcp_bind(&"127.0.0.1:0".parse().unwrap()).unwrap();