Do minimal processing of gnubby data. Add request timeouts and send error

remoting/host/gnubby_socket.h

Index: remoting/host/gnubby_socket.h
diff --git a/remoting/host/gnubby_socket.h b/remoting/host/gnubby_socket.h
new file mode 100644
index 0000000000000000000000000000000000000000..d1197629b80fdcd38c080ed123642070fdc7c2e5
--- /dev/null
+++ b/remoting/host/gnubby_socket.h
@@ -0,0 +1,80 @@
+// Copyright 2014 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef REMOTING_HOST_GNUBBY_SOCKET_H_
+#define REMOTING_HOST_GNUBBY_SOCKET_H_
+
+#include <string>
+#include <vector>
+
+#include "base/callback.h"
+#include "base/memory/scoped_ptr.h"
+#include "base/threading/non_thread_safe.h"
+
+namespace base {
+class Timer;
+}  // namespace base
+
+namespace net {
+class StreamListenSocket;
+}  // namespace net
+
+namespace remoting {
+
+// Class that manages a socket used for gnubby requests.
+class GnubbySocket : public base::NonThreadSafe {
+ public:
+  GnubbySocket(scoped_ptr<net::StreamListenSocket> socket,
+               const base::Closure& timeout_callback);
+  ~GnubbySocket();
+
+  // Adds data to the current request.
+  void AddRequestData(const char* data, int data_len);
+
+  // Gets the current request data and clears it.
+  void GetAndClearRequestData(std::string* data_out);
+
+  // Returns true if the current request is complete.
+  bool IsRequestComplete() const;
+
+  // Returns true if the stated request size is larger than the allowed maximum.
+  bool IsRequestTooLarge() const;
+
+  // Sends response data to the socket.
+  void SendResponse(const std::string& data);
+
+  // Sends an SSH error code to the socket.
+  void SendSshError();
+
+  // Returns true if |socket| is the same one owned by this object.
+  bool IsSocket(net::StreamListenSocket* socket) const;
+
+  // Sets a timer for testing.
+  void SetTimerForTesting(scoped_ptr<base::Timer> timer);
+
+ private:
+  // Returns the stated request length.
+  size_t GetRequestLength() const;
+
+  // Returns the response length bytes.
+  std::string GetResponseLengthAsBytes(const std::string& response) const;
+
+  // Resets the socket activity timer.
+  void ResetTimer();
+
+  // The socket.
+  scoped_ptr<net::StreamListenSocket> socket_;
+
+  // Request data.
+  std::vector<char> request_data_;
+
+  // The activity timer.
+  scoped_ptr<base::Timer> timer_;
+
+  DISALLOW_COPY_AND_ASSIGN(GnubbySocket);
+};
+
+}  // namespace remoting
+
+#endif  // REMOTING_HOST_GNUBBY_SOCKET_H_