win: crashpad_handler should create its own pipe name in ephemeral mode

util/win/exception_handler_server.h

 // Copyright 2015 The Crashpad Authors. All rights reserved.
 //
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.
 // You may obtain a copy of the License at
 //
 //     http://www.apache.org/licenses/LICENSE-2.0
 //
 // Unless required by applicable law or agreed to in writing, software
 // distributed under the License is distributed on an "AS IS" BASIS,
 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
 #ifndef CRASHPAD_UTIL_WIN_EXCEPTION_HANDLER_SERVER_H_
 #define CRASHPAD_UTIL_WIN_EXCEPTION_HANDLER_SERVER_H_
 
 #include <set>
 #include <string>
 
 #include "base/basictypes.h"
 #include "base/synchronization/lock.h"
+#include "util/file/file_io.h"
 #include "util/win/address_types.h"
 #include "util/win/scoped_handle.h"
 
 namespace crashpad {
 
 namespace internal {
 class PipeServiceContext;
 class ClientData;
 }  // namespace internal
 
@@ skipping 22 matching lines @@
     //! \return The exit code that should be used when terminating the client
     //!     process.
     virtual unsigned int ExceptionHandlerServerException(
         HANDLE process,
         WinVMAddress exception_information_address,
         WinVMAddress debug_critical_section_address) = 0;
   };
 
   //! \brief Constructs the exception handling server.
   //!
-  //! \param[in] pipe_name The name of the pipe to listen on. Must be of the
-  //!     form "\\.\pipe\<some_name>".
   //! \param[in] persistent `true` if Run() should not return until Stop() is
   //!     called. If `false`, Run() will return when all clients have exited,
   //!     although Run() will always wait for the first client to connect.
-  ExceptionHandlerServer(const std::string& pipe_name, bool persistent);
+  explicit ExceptionHandlerServer(bool persistent);
 
   ~ExceptionHandlerServer();
 
+  //! \brief Sets the pipe name to listen for client registrations on.
+  //!
+  //! Either this method or CreatePipe(), but not both, must be called before
+  //! Run().
+  //!
+  //! \param[in] pipe_name The name of the pipe to listen on. Must be of the
+  //!     form "\\.\pipe\<some_name>".
+  void SetPipeName(const std::wstring& pipe_name);
+
+  //! \brief Creates a randomized pipe name to listen for client registrations
+  //!     on and returns its name.
+  //!
+  //! Either this method or CreatePipe(), but not both, must be called before
+  //! Run().
+  //!
+  //! \return The pipe name that will be listened on.
+  std::wstring CreatePipe();
+
   //! \brief Runs the exception-handling server.
   //!
   //! \param[in] delegate The interface to which the exceptions are delegated
   //!     when they are caught in Run(). Ownership is not transferred.
   void Run(Delegate* delegate);
 
   //! \brief Stops the exception-handling server. Returns immediately. The
   //!     object must not be destroyed until Run() returns.
   void Stop();
 
  private:
   static bool ServiceClientConnection(
       const internal::PipeServiceContext& service_context);
   static DWORD __stdcall PipeServiceProc(void* ctx);
   static void __stdcall OnCrashDumpEvent(void* ctx, BOOLEAN);
   static void __stdcall OnNonCrashDumpEvent(void* ctx, BOOLEAN);
   static void __stdcall OnProcessEnd(void* ctx, BOOLEAN);
 
-  std::string pipe_name_;
+  std::wstring pipe_name_;
   ScopedKernelHANDLE port_;
+  ScopedFileHandle first_pipe_instance_;
 
   base::Lock clients_lock_;
   std::set<internal::ClientData*> clients_;
 
   bool persistent_;
 
   DISALLOW_COPY_AND_ASSIGN(ExceptionHandlerServer);
 };
 
 }  // namespace crashpad
 
 #endif  // CRASHPAD_UTIL_WIN_EXCEPTION_HANDLER_SERVER_H_