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// Copyright 2015 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 IPC_BROKERABLE_ATTACHMENT_H_
#define IPC_BROKERABLE_ATTACHMENT_H_
#include <stddef.h>
#include <stdint.h>
#include <algorithm>
#include "base/macros.h"
#include "build/build_config.h"
#include "ipc/ipc_export.h"
#include "ipc/ipc_message_attachment.h"
namespace IPC {
// This subclass of MessageAttachment requires an AttachmentBroker to be
// attached to a Chrome IPC message.
class IPC_EXPORT BrokerableAttachment : public MessageAttachment {
public:
static const size_t kNonceSize = 16;
// An id uniquely identifies an attachment sent via a broker.
struct IPC_EXPORT AttachmentId {
uint8_t nonce[kNonceSize];
// Generates an AttachmentId with an unguessable, random nonce.
static AttachmentId CreateIdWithRandomNonce();
// Creates an AttachmentId with a zeroed nonce. This should only be used by
// the IPC translation system, which requires that classes have a default
// constructor.
AttachmentId();
// Constructs an AttachmentId from a buffer.
AttachmentId(const char* start_address, size_t size);
// Writes the nonce into a buffer.
void SerializeToBuffer(char* start_address, size_t size);
bool operator==(const AttachmentId& rhs) const {
return std::equal(nonce, nonce + kNonceSize, rhs.nonce);
}
bool operator<(const AttachmentId& rhs) const {
return std::lexicographical_compare(nonce, nonce + kNonceSize, rhs.nonce,
rhs.nonce + kNonceSize);
}
};
enum BrokerableType {
PLACEHOLDER,
WIN_HANDLE,
MACH_PORT,
};
// The identifier is unique across all Chrome processes.
AttachmentId GetIdentifier() const;
// Whether the attachment still needs information from the broker before it
// can be used.
bool NeedsBrokering() const;
// Returns TYPE_BROKERABLE_ATTACHMENT
Type GetType() const override;
virtual BrokerableType GetBrokerableType() const = 0;
// MessageAttachment override.
#if defined(OS_POSIX)
base::PlatformFile TakePlatformFile() override;
#endif // OS_POSIX
protected:
BrokerableAttachment();
BrokerableAttachment(const AttachmentId& id);
~BrokerableAttachment() override;
private:
// This member uniquely identifies a BrokerableAttachment across all Chrome
// processes.
const AttachmentId id_;
DISALLOW_COPY_AND_ASSIGN(BrokerableAttachment);
};
} // namespace IPC
#endif // IPC_BROKERABLE_ATTACHMENT_H_
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