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88 lines
2.5 KiB
88 lines
2.5 KiB
4 months ago
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/*
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* Copyright 2020 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#pragma once
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#include "keymaster/android_keymaster_messages.h"
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#include "keymaster/serializable.h"
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#include "common/libs/fs/shared_fd.h"
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#include <memory>
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namespace keymaster {
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/**
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* keymaster_message - Serial header for communicating with KM server
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* @cmd: the command, one of AndroidKeymasterCommand.
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* @payload: start of the serialized command specific payload
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*/
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struct keymaster_message {
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AndroidKeymasterCommand cmd : 31;
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bool is_response : 1;
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uint32_t payload_size;
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uint8_t payload[0];
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};
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} // namespace keymaster
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namespace cuttlefish {
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using keymaster::AndroidKeymasterCommand;
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using keymaster::keymaster_message;
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/**
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* A destroyer for keymaster_message instances created with
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* CreateKeymasterMessage. Wipes memory from the keymaster_message instances.
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*/
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class KeymasterCommandDestroyer {
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public:
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void operator()(keymaster_message* ptr);
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};
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/** An owning pointer for a keymaster_message instance. */
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using ManagedKeymasterMessage =
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std::unique_ptr<keymaster_message, KeymasterCommandDestroyer>;
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/**
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* Allocates memory for a keymaster_message carrying a message of size
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* `payload_size`.
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*/
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ManagedKeymasterMessage CreateKeymasterMessage(
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AndroidKeymasterCommand command, bool is_response, size_t payload_size);
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/*
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* Interface for communication channels that synchronously communicate Keymaster
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* IPC/RPC calls. Sends messages over a file descriptor.
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*/
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class KeymasterChannel {
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public:
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KeymasterChannel(SharedFD input, SharedFD output);
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bool SendRequest(AndroidKeymasterCommand command,
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const keymaster::Serializable& message);
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bool SendResponse(AndroidKeymasterCommand command,
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const keymaster::Serializable& message);
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ManagedKeymasterMessage ReceiveMessage();
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private:
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SharedFD input_;
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SharedFD output_;
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bool SendMessage(AndroidKeymasterCommand command, bool response,
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const keymaster::Serializable& message);
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};
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} // namespace cuttlefish
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