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+// Copyright (c) 2008, Google Inc.
+// All rights reserved.
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+#ifndef CLIENT_WINDOWS_CRASH_GENERATION_CRASH_GENERATION_SERVER_H__
+#define CLIENT_WINDOWS_CRASH_GENERATION_CRASH_GENERATION_SERVER_H__
+
+#include <list>
+#include <string>
+#include "client/windows/common/ipc_protocol.h"
+#include "client/windows/crash_generation/minidump_generator.h"
+#include "common/scoped_ptr.h"
+
+namespace google_breakpad {
+class ClientInfo;
+
+// Abstraction for server side implementation of out-of-process crash
+// generation protocol for Windows platform only. It generates Windows
+// minidump files for client processes that request dump generation. When
+// the server is requested to start listening for clients (by calling the
+// Start method), it creates a named pipe and waits for the clients to
+// register. In response, it hands them event handles that the client can
+// signal to request dump generation. When the clients request dump
+// generation in this way, the server generates Windows minidump files.
+class CrashGenerationServer {
+ public:
+  typedef void (*OnClientConnectedCallback)(void* context,
+                                            const ClientInfo* client_info);
+
+  typedef void (*OnClientDumpRequestCallback)(void* context,
+                                              const ClientInfo* client_info,
+                                              const std::wstring* file_path);
+
+  typedef void (*OnClientExitedCallback)(void* context,
+                                         const ClientInfo* client_info);
+
+  typedef void (*OnClientUploadRequestCallback)(void* context,
+                                                const DWORD crash_id);
+
+  // Creates an instance with the given parameters.
+  //
+  // Parameter pipe_name: Name of the Windows named pipe
+  // Parameter pipe_sec_attrs Security attributes to set on the pipe. Pass
+  //     NULL to use default security on the pipe. By default, the pipe created
+  //     allows Local System, Administrators and the Creator full control and
+  //     the Everyone group read access on the pipe.
+  // Parameter connect_callback: Callback for a new client connection.
+  // Parameter connect_context: Context for client connection callback.
+  // Parameter crash_callback: Callback for a client crash dump request.
+  // Parameter crash_context: Context for client crash dump request callback.
+  // Parameter exit_callback: Callback for client process exit.
+  // Parameter exit_context: Context for client exit callback.
+  // Parameter generate_dumps: Whether to automatically generate dumps.
+  // Client code of this class might want to generate dumps explicitly in the
+  // crash dump request callback. In that case, false can be passed for this
+  // parameter.
+  // Parameter dump_path: Path for generating dumps; required only if true is
+  // passed for generateDumps parameter; NULL can be passed otherwise.
+  CrashGenerationServer(const std::wstring& pipe_name,
+                        SECURITY_ATTRIBUTES* pipe_sec_attrs,
+                        OnClientConnectedCallback connect_callback,
+                        void* connect_context,
+                        OnClientDumpRequestCallback dump_callback,
+                        void* dump_context,
+                        OnClientExitedCallback exit_callback,
+                        void* exit_context,
+                        OnClientUploadRequestCallback upload_request_callback,
+                        void* upload_context,
+                        bool generate_dumps,
+                        const std::wstring* dump_path);
+
+  ~CrashGenerationServer();
+
+  // Performs initialization steps needed to start listening to clients. Upon
+  // successful return clients may connect to this server's pipe.
+  //
+  // Returns true if initialization is successful; false otherwise.
+  bool Start();
+
+  void pre_fetch_custom_info(bool do_pre_fetch) {
+    pre_fetch_custom_info_ = do_pre_fetch;
+  }
+
+ private:
+  // Various states the client can be in during the handshake with
+  // the server.
+  enum IPCServerState {
+    // Server starts in this state.
+    IPC_SERVER_STATE_UNINITIALIZED,
+
+    // Server is in error state and it cannot serve any clients.
+    IPC_SERVER_STATE_ERROR,
+
+    // Server starts in this state.
+    IPC_SERVER_STATE_INITIAL,
+
+    // Server has issued an async connect to the pipe and it is waiting
+    // for the connection to be established.
+    IPC_SERVER_STATE_CONNECTING,
+
+    // Server is connected successfully.
+    IPC_SERVER_STATE_CONNECTED,
+
+    // Server has issued an async read from the pipe and it is waiting for
+    // the read to finish.
+    IPC_SERVER_STATE_READING,
+
+    // Server is done reading from the pipe.
+    IPC_SERVER_STATE_READ_DONE,
+
+    // Server has issued an async write to the pipe and it is waiting for
+    // the write to finish.
+    IPC_SERVER_STATE_WRITING,
+
+    // Server is done writing to the pipe.
+    IPC_SERVER_STATE_WRITE_DONE,
+
+    // Server has issued an async read from the pipe for an ack and it
+    // is waiting for the read to finish.
+    IPC_SERVER_STATE_READING_ACK,
+
+    // Server is done writing to the pipe and it is now ready to disconnect
+    // and reconnect.
+    IPC_SERVER_STATE_DISCONNECTING
+  };
+
+  //
+  // Helper methods to handle various server IPC states.
+  //
+  void HandleErrorState();
+  void HandleInitialState();
+  void HandleConnectingState();
+  void HandleConnectedState();
+  void HandleReadingState();
+  void HandleReadDoneState();
+  void HandleWritingState();
+  void HandleWriteDoneState();
+  void HandleReadingAckState();
+  void HandleDisconnectingState();
+
+  // Prepares reply for a client from the given parameters.
+  bool PrepareReply(const ClientInfo& client_info,
+                    ProtocolMessage* reply) const;
+
+  // Duplicates various handles in the ClientInfo object for the client
+  // process and stores them in the given ProtocolMessage instance. If
+  // creating any handle fails, ProtocolMessage will contain the handles
+  // already created successfully, which should be closed by the caller.
+  bool CreateClientHandles(const ClientInfo& client_info,
+                           ProtocolMessage* reply) const;
+
+  // Response to the given client. Return true if all steps of
+  // responding to the client succeed, false otherwise.
+  bool RespondToClient(ClientInfo* client_info);
+
+  // Handles a connection request from the client.
+  void HandleConnectionRequest();
+
+  // Handles a dump request from the client.
+  void HandleDumpRequest(const ClientInfo& client_info);
+
+  // Callback for pipe connected event.
+  static void CALLBACK OnPipeConnected(void* context, BOOLEAN timer_or_wait);
+
+  // Callback for a dump request.
+  static void CALLBACK OnDumpRequest(void* context, BOOLEAN timer_or_wait);
+
+  // Callback for client process exit event.
+  static void CALLBACK OnClientEnd(void* context, BOOLEAN timer_or_wait);
+
+  // Handles client process exit.
+  void HandleClientProcessExit(ClientInfo* client_info);
+
+  // Adds the given client to the list of registered clients.
+  bool AddClient(ClientInfo* client_info);
+
+  // Generates dump for the given client.
+  bool GenerateDump(const ClientInfo& client, std::wstring* dump_path);
+
+  // Puts the server in a permanent error state and sets a signal such that
+  // the state will be immediately entered after the current state transition
+  // is complete.
+  void EnterErrorState();
+
+  // Puts the server in the specified state and sets a signal such that the
+  // state is immediately entered after the current state transition is
+  // complete.
+  void EnterStateImmediately(IPCServerState state);
+
+  // Puts the server in the specified state. No signal will be set, so the state
+  // transition will only occur when signaled manually or by completion of an
+  // asynchronous IO operation.
+  void EnterStateWhenSignaled(IPCServerState state);
+
+  // Sync object for thread-safe access to the shared list of clients.
+  CRITICAL_SECTION sync_;
+
+  // List of clients.
+  std::list<ClientInfo*> clients_;
+
+  // Pipe name.
+  std::wstring pipe_name_;
+
+  // Pipe security attributes
+  SECURITY_ATTRIBUTES* pipe_sec_attrs_;
+
+  // Handle to the pipe used for handshake with clients.
+  HANDLE pipe_;
+
+  // Pipe wait handle.
+  HANDLE pipe_wait_handle_;
+
+  // Handle to server-alive mutex.
+  HANDLE server_alive_handle_;
+
+  // Callback for a successful client connection.
+  OnClientConnectedCallback connect_callback_;
+
+  // Context for client connected callback.
+  void* connect_context_;
+
+  // Callback for a client dump request.
+  OnClientDumpRequestCallback dump_callback_;
+
+  // Context for client dump request callback.
+  void* dump_context_;
+
+  // Callback for client process exit.
+  OnClientExitedCallback exit_callback_;
+
+  // Context for client process exit callback.
+  void* exit_context_;
+
+  // Callback for upload request.
+  OnClientUploadRequestCallback upload_request_callback_;
+
+  // Context for upload request callback.
+  void* upload_context_;
+
+  // Whether to generate dumps.
+  bool generate_dumps_;
+
+  // Wether to populate custom information up-front.
+  bool pre_fetch_custom_info_;
+
+  // The dump path for the server.
+  const std::wstring dump_path_;
+
+  // State of the server in performing the IPC with the client.
+  // Note that since we restrict the pipe to one instance, we
+  // only need to keep one state of the server. Otherwise, server
+  // would have one state per client it is talking to.
+  IPCServerState server_state_;
+
+  // Whether the server is shutting down.
+  bool shutting_down_;
+
+  // Overlapped instance for async I/O on the pipe.
+  OVERLAPPED overlapped_;
+
+  // Message object used in IPC with the client.
+  ProtocolMessage msg_;
+
+  // Client Info for the client that's connecting to the server.
+  ClientInfo* client_info_;
+
+  // Disable copy ctor and operator=.
+  CrashGenerationServer(const CrashGenerationServer& crash_server);
+  CrashGenerationServer& operator=(const CrashGenerationServer& crash_server);
+};
+
+}  // namespace google_breakpad
+
+#endif  // CLIENT_WINDOWS_CRASH_GENERATION_CRASH_GENERATION_SERVER_H__