Include fuzz testing setup (#274)

tests/h2-fuzz/src/main.rs

@@ -0,0 +1,159 @@
+#[macro_use]
+extern crate futures;
+extern crate tokio_io;
+#[macro_use]
+extern crate honggfuzz;
+extern crate env_logger;
+extern crate h2;
+extern crate http;
+
+use futures::prelude::*;
+use futures::{executor, future, task};
+use http::{Method, Request};
+use std::cell::Cell;
+use std::io::{self, Read, Write};
+use std::sync::Arc;
+use tokio_io::{AsyncRead, AsyncWrite};
+
+struct MockIo<'a> {
+    input: &'a [u8],
+}
+
+impl<'a> MockIo<'a> {
+    fn next_byte(&mut self) -> Option<u8> {
+        if let Some(&c) = self.input.first() {
+            self.input = &self.input[1..];
+            Some(c)
+        } else {
+            None
+        }
+    }
+
+    fn next_u32(&mut self) -> u32 {
+        (self.next_byte().unwrap_or(0) as u32) << 8 | self.next_byte().unwrap_or(0) as u32
+    }
+}
+
+impl<'a> Read for MockIo<'a> {
+    fn read(&mut self, buf: &mut [u8]) -> Result<usize, io::Error> {
+        let mut len = self.next_u32() as usize;
+        if self.input.is_empty() {
+            Ok(0)
+        } else if len == 0 {
+            task::current().notify();
+            Err(io::ErrorKind::WouldBlock.into())
+        } else {
+            if len > self.input.len() {
+                len = self.input.len();
+            }
+
+            if len > buf.len() {
+                len = buf.len();
+            }
+            buf[0..len].copy_from_slice(&self.input[0..len]);
+            self.input = &self.input[len..];
+            Ok(len)
+        }
+    }
+}
+
+impl<'a> AsyncRead for MockIo<'a> {
+    unsafe fn prepare_uninitialized_buffer(&self, _buf: &mut [u8]) -> bool {
+        false
+    }
+}
+
+impl<'a> Write for MockIo<'a> {
+    fn write(&mut self, buf: &[u8]) -> Result<usize, io::Error> {
+        let len = std::cmp::min(self.next_u32() as usize, buf.len());
+        if len == 0 {
+            if self.input.is_empty() {
+                Err(io::ErrorKind::BrokenPipe.into())
+            } else {
+                task::current().notify();
+                Err(io::ErrorKind::WouldBlock.into())
+            }
+        } else {
+            Ok(len)
+        }
+    }
+
+    fn flush(&mut self) -> Result<(), io::Error> {
+        Ok(())
+    }
+}
+
+impl<'a> AsyncWrite for MockIo<'a> {
+    fn shutdown(&mut self) -> Poll<(), io::Error> {
+        Ok(Async::Ready(()))
+    }
+}
+
+struct MockNotify {
+    notified: Cell<bool>,
+}
+
+unsafe impl Sync for MockNotify {}
+
+impl executor::Notify for MockNotify {
+    fn notify(&self, _id: usize) {
+        self.notified.set(true);
+    }
+}
+
+impl MockNotify {
+    fn take_notify(&self) -> bool {
+        self.notified.replace(false)
+    }
+}
+
+fn run(script: &[u8]) -> Result<(), h2::Error> {
+    let notify = Arc::new(MockNotify {
+        notified: Cell::new(false),
+    });
+    let notify_handle: executor::NotifyHandle = notify.clone().into();
+    let io = MockIo { input: script };
+    let (mut h2, mut connection) = h2::client::handshake(io).wait()?;
+    let mut in_progress = None;
+    let future = future::poll_fn(|| {
+        if let Async::Ready(()) = connection.poll()? {
+            return Ok(Async::Ready(()));
+        }
+        if in_progress.is_none() {
+            try_ready!(h2.poll_ready());
+            let request = Request::builder()
+                .method(Method::POST)
+                .uri("https://example.com/")
+                .body(())
+                .unwrap();
+            let (resp, mut send) = h2.send_request(request, false)?;
+            send.send_data(vec![0u8; 32769].into(), true).unwrap();
+            drop(send);
+            in_progress = Some(resp);
+        }
+        match in_progress.as_mut().unwrap().poll() {
+            r @ Ok(Async::Ready(_)) | r @ Err(_) => {
+                eprintln!("{:?}", r);
+                in_progress = None;
+            }
+            Ok(Async::NotReady) => (),
+        }
+        Ok::<_, h2::Error>(Async::NotReady)
+    });
+    let mut spawn = executor::spawn(future);
+    loop {
+        if let Async::Ready(()) = spawn.poll_future_notify(&notify_handle, 0)? {
+            return Ok(());
+        }
+        assert!(notify.take_notify());
+    }
+}
+
+fn main() {
+    env_logger::init();
+    loop {
+        fuzz!(|data: &[u8]| {
+            eprintln!("{:?}", run(data));
+        });
+    }
+}