ipc/brokerable_attachment.h

   1 // Copyright 2015 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #ifndef IPC_BROKERABLE_ATTACHMENT_H_
   6 #define IPC_BROKERABLE_ATTACHMENT_H_
   7
   8 #include <stdint.h>
   9
  10 #include "base/macros.h"
  11 #include "ipc/ipc_export.h"
  12 #include "ipc/ipc_message_attachment.h"
  13
  14 namespace IPC {
  15
  16 // This subclass of MessageAttachment requires an AttachmentBroker to be
  17 // attached to a Chrome IPC message.
  18 class IPC_EXPORT BrokerableAttachment : public MessageAttachment {
  19  public:
  20   static const size_t kNonceSize = 16;
  21   // An id uniquely identifies an attachment sent via a broker.
  22   struct IPC_EXPORT AttachmentId {
  23     uint8_t nonce[kNonceSize];
  24   };
  25
  26   enum BrokerableType {
  27     WIN_HANDLE,
  28   };
  29
  30   // The identifier is unique across all Chrome processes.
  31   AttachmentId GetIdentifier() const;
  32
  33   // Returns TYPE_BROKERABLE_ATTACHMENT
  34   Type GetType() const override;
  35
  36   virtual BrokerableType GetBrokerableType() const = 0;
  37
  38  protected:
  39   BrokerableAttachment();
  40   explicit BrokerableAttachment(const AttachmentId& id);
  41   ~BrokerableAttachment() override;
  42
  43  private:
  44   // This member uniquely identifies a BrokerableAttachment across all Chrome
  45   // processes.
  46   const AttachmentId id_;
  47   DISALLOW_COPY_AND_ASSIGN(BrokerableAttachment);
  48 };
  49
  50 }  // namespace IPC
  51
  52 #endif  // IPC_BROKERABLE_ATTACHMENT_H_