1 /* 2 * Copyright (C) 2021 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 #pragma once 17 18 #include <sys/socket.h> 19 20 #include <cstdint> 21 #include <vector> 22 23 #include "common/libs/fs/shared_fd.h" 24 #include "common/libs/utils/result.h" 25 26 namespace cuttlefish { 27 28 struct ControlMessage { 29 public: 30 static ControlMessage FromRaw(const cmsghdr*); 31 static Result<ControlMessage> FromFileDescriptors( 32 const std::vector<SharedFD>&); 33 static ControlMessage FromCredentials(const ucred&); 34 ControlMessage(const ControlMessage&) = delete; 35 ControlMessage(ControlMessage&&); 36 ~ControlMessage(); 37 ControlMessage& operator=(const ControlMessage&) = delete; 38 ControlMessage& operator=(ControlMessage&&); 39 40 const cmsghdr* Raw() const; 41 42 bool IsCredentials() const; 43 Result<ucred> AsCredentials() const; 44 45 bool IsFileDescriptors() const; 46 Result<std::vector<SharedFD>> AsSharedFDs() const; 47 48 private: 49 friend class UnixMessageSocket; 50 ControlMessage() = default; 51 cmsghdr* Raw(); 52 53 std::vector<char> data_; 54 std::vector<int> fds_; 55 }; 56 57 struct UnixSocketMessage { 58 std::vector<char> data; 59 std::vector<ControlMessage> control; 60 61 bool HasFileDescriptors(); 62 Result<std::vector<SharedFD>> FileDescriptors(); 63 bool HasCredentials(); 64 Result<ucred> Credentials(); 65 }; 66 67 class UnixMessageSocket { 68 public: 69 UnixMessageSocket(SharedFD); 70 [[nodiscard]] Result<void> WriteMessage(const UnixSocketMessage&); 71 Result<UnixSocketMessage> ReadMessage(); 72 73 [[nodiscard]] Result<void> EnableCredentials(bool); 74 75 private: 76 SharedFD socket_; 77 std::uint32_t max_message_size_; 78 }; 79 80 } // namespace cuttlefish 81