A simple fuzzer for HttpServer, with limited coverage of WebSocket.

net/socket/fuzzed_server_socket.h

+// Copyright (c) 2017 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 NET_SOCKET_FUZZED_SERVER_SOCKET_H_
+#define NET_SOCKET_FUZZED_SERVER_SOCKET_H_
+
+#include <stdint.h>
+
+#include <memory>
+#include <string>
+
+#include "base/macros.h"
+#include "base/memory/weak_ptr.h"
+#include "net/base/ip_endpoint.h"
+#include "net/socket/server_socket.h"
+
+namespace base {
+class FuzzedDataProvider;
+}
+
+namespace net {
+
+class NetLog;
+class StreamSocket;
+
+// A ServerSocket that uses a FuzzedDataProvider to generate the input the
+// server receives. It succeeds in Accept()ing, asynchronously, a single
+// connection with that input; later calls to Accept will just return
+// ERR_IO_PENDING but will not invoke the callback.
+class FuzzedServerSocket : public ServerSocket {
+ public:
+  // |data_provider| is used as to determine behavior of the socket. It
+  // must remain valid until after both this object and the StreamSocket
+  // produced by Accept are destroyed.
+  FuzzedServerSocket(base::FuzzedDataProvider* data_provider,
+                     net::NetLog* net_log);
+  ~FuzzedServerSocket() override;
+
+  int Listen(const IPEndPoint& address, int backlog) override;
+  int GetLocalAddress(IPEndPoint* address) const override;
+
+  int Accept(std::unique_ptr<StreamSocket>* socket,
+             const CompletionCallback& callback) override;
+
+ private:
+  void DispatchAccept(std::unique_ptr<StreamSocket>* socket,
+                      const CompletionCallback& callback);
+
+  base::FuzzedDataProvider* data_provider_;
+  net::NetLog* net_log_;
+
+  IPEndPoint listening_on_;
+  bool first_accept_;
+  bool listen_called_;
+
+  base::WeakPtrFactory<FuzzedServerSocket> weak_factory_;
+  DISALLOW_COPY_AND_ASSIGN(FuzzedServerSocket);
+};
+
+}  // namespace net
+
+#endif  // NET_SOCKET_FUZZED_SERVER_SOCKET_H_