Cody Schuffelen | fa69c38 | 2018-12-17 18:57:36 -0800 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2018 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 | |
Cody Schuffelen | 3ee23ab | 2019-01-15 17:22:35 -0800 | [diff] [blame] | 17 | #include <set> |
Cody Schuffelen | fa69c38 | 2018-12-17 18:57:36 -0800 | [diff] [blame] | 18 | #include <thread> |
| 19 | #include <glog/logging.h> |
| 20 | #include <gflags/gflags.h> |
| 21 | |
| 22 | #include "common/libs/fs/shared_fd.h" |
Cody Schuffelen | 134ff03 | 2019-11-22 00:25:32 -0800 | [diff] [blame^] | 23 | #include "common/vsoc/lib/socket_forward_region_view.h" |
Cody Schuffelen | fa69c38 | 2018-12-17 18:57:36 -0800 | [diff] [blame] | 24 | |
| 25 | #ifdef CUTTLEFISH_HOST |
| 26 | #include "host/libs/config/cuttlefish_config.h" |
| 27 | #endif |
| 28 | |
Cody Schuffelen | 134ff03 | 2019-11-22 00:25:32 -0800 | [diff] [blame^] | 29 | using vsoc::socket_forward::Packet; |
Cody Schuffelen | fa69c38 | 2018-12-17 18:57:36 -0800 | [diff] [blame] | 30 | |
Cody Schuffelen | 2716384 | 2019-02-07 15:36:51 -0800 | [diff] [blame] | 31 | DEFINE_uint32(tcp_port, 0, "TCP port (server on host, client on guest)"); |
| 32 | DEFINE_uint32(vsock_port, 0, "vsock port (client on host, server on guest"); |
Cody Schuffelen | fa69c38 | 2018-12-17 18:57:36 -0800 | [diff] [blame] | 33 | DEFINE_uint32(vsock_guest_cid, 0, "Guest identifier"); |
Cody Schuffelen | fa69c38 | 2018-12-17 18:57:36 -0800 | [diff] [blame] | 34 | |
| 35 | namespace { |
| 36 | // Sends packets, Shutdown(SHUT_WR) on destruction |
| 37 | class SocketSender { |
| 38 | public: |
| 39 | explicit SocketSender(cvd::SharedFD socket) : socket_{socket} {} |
| 40 | |
| 41 | SocketSender(SocketSender&&) = default; |
| 42 | SocketSender& operator=(SocketSender&&) = default; |
| 43 | |
| 44 | SocketSender(const SocketSender&&) = delete; |
| 45 | SocketSender& operator=(const SocketSender&) = delete; |
| 46 | |
| 47 | ~SocketSender() { |
| 48 | if (socket_.operator->()) { // check that socket_ was not moved-from |
| 49 | socket_->Shutdown(SHUT_WR); |
| 50 | } |
| 51 | } |
| 52 | |
| 53 | ssize_t SendAll(const Packet& packet) { |
| 54 | ssize_t written{}; |
| 55 | while (written < static_cast<ssize_t>(packet.payload_length())) { |
| 56 | if (!socket_->IsOpen()) { |
| 57 | return -1; |
| 58 | } |
| 59 | auto just_written = |
| 60 | socket_->Send(packet.payload() + written, |
| 61 | packet.payload_length() - written, MSG_NOSIGNAL); |
| 62 | if (just_written <= 0) { |
| 63 | LOG(INFO) << "Couldn't write to client: " |
| 64 | << strerror(socket_->GetErrno()); |
| 65 | return just_written; |
| 66 | } |
| 67 | written += just_written; |
| 68 | } |
| 69 | return written; |
| 70 | } |
| 71 | |
| 72 | private: |
| 73 | cvd::SharedFD socket_; |
| 74 | }; |
| 75 | |
| 76 | class SocketReceiver { |
| 77 | public: |
| 78 | explicit SocketReceiver(cvd::SharedFD socket) : socket_{socket} {} |
| 79 | |
| 80 | SocketReceiver(SocketReceiver&&) = default; |
| 81 | SocketReceiver& operator=(SocketReceiver&&) = default; |
| 82 | |
| 83 | SocketReceiver(const SocketReceiver&&) = delete; |
| 84 | SocketReceiver& operator=(const SocketReceiver&) = delete; |
| 85 | |
| 86 | // *packet will be empty if Read returns 0 or error |
| 87 | void Recv(Packet* packet) { |
| 88 | auto size = socket_->Read(packet->payload(), sizeof packet->payload()); |
| 89 | if (size < 0) { |
| 90 | size = 0; |
| 91 | } |
| 92 | packet->set_payload_length(size); |
| 93 | } |
| 94 | |
| 95 | private: |
| 96 | cvd::SharedFD socket_; |
| 97 | }; |
| 98 | |
| 99 | void SocketToVsock(SocketReceiver socket_receiver, |
| 100 | SocketSender vsock_sender) { |
| 101 | while (true) { |
| 102 | auto packet = Packet::MakeData(); |
| 103 | socket_receiver.Recv(&packet); |
| 104 | if (packet.empty() || vsock_sender.SendAll(packet) < 0) { |
| 105 | break; |
| 106 | } |
| 107 | } |
| 108 | LOG(INFO) << "Socket to vsock exiting"; |
| 109 | } |
| 110 | |
| 111 | void VsockToSocket(SocketSender socket_sender, |
| 112 | SocketReceiver vsock_receiver) { |
| 113 | auto packet = Packet::MakeData(); |
| 114 | while (true) { |
| 115 | vsock_receiver.Recv(&packet); |
| 116 | CHECK(packet.IsData()); |
| 117 | if (packet.empty()) { |
| 118 | break; |
| 119 | } |
| 120 | if (socket_sender.SendAll(packet) < 0) { |
| 121 | break; |
| 122 | } |
| 123 | } |
| 124 | LOG(INFO) << "Vsock to socket exiting"; |
| 125 | } |
| 126 | |
| 127 | // One thread for reading from shm and writing into a socket. |
| 128 | // One thread for reading from a socket and writing into shm. |
| 129 | void HandleConnection(cvd::SharedFD vsock, |
| 130 | cvd::SharedFD socket) { |
| 131 | auto socket_to_vsock = |
| 132 | std::thread(SocketToVsock, SocketReceiver{socket}, SocketSender{vsock}); |
| 133 | VsockToSocket(SocketSender{socket}, SocketReceiver{vsock}); |
| 134 | socket_to_vsock.join(); |
| 135 | } |
| 136 | |
| 137 | #ifdef CUTTLEFISH_HOST |
| 138 | [[noreturn]] void host() { |
Cody Schuffelen | 2716384 | 2019-02-07 15:36:51 -0800 | [diff] [blame] | 139 | LOG(INFO) << "starting server on " << FLAGS_tcp_port << " for vsock port " |
| 140 | << FLAGS_vsock_port; |
| 141 | auto server = cvd::SharedFD::SocketLocalServer(FLAGS_tcp_port, SOCK_STREAM); |
| 142 | CHECK(server->IsOpen()) << "Could not start server on " << FLAGS_tcp_port; |
Jorge E. Moreira | f15975c | 2019-03-26 17:44:14 -0700 | [diff] [blame] | 143 | LOG(INFO) << "Accepting client connections"; |
| 144 | int last_failure_reason = 0; |
Cody Schuffelen | fa69c38 | 2018-12-17 18:57:36 -0800 | [diff] [blame] | 145 | while (true) { |
Cody Schuffelen | fa69c38 | 2018-12-17 18:57:36 -0800 | [diff] [blame] | 146 | auto client_socket = cvd::SharedFD::Accept(*server); |
| 147 | CHECK(client_socket->IsOpen()) << "error creating client socket"; |
Cody Schuffelen | 3ee23ab | 2019-01-15 17:22:35 -0800 | [diff] [blame] | 148 | cvd::SharedFD vsock_socket = cvd::SharedFD::VsockClient( |
Cody Schuffelen | 2716384 | 2019-02-07 15:36:51 -0800 | [diff] [blame] | 149 | FLAGS_vsock_guest_cid, FLAGS_vsock_port, SOCK_STREAM); |
Jorge E. Moreira | f15975c | 2019-03-26 17:44:14 -0700 | [diff] [blame] | 150 | if (vsock_socket->IsOpen()) { |
| 151 | last_failure_reason = 0; |
| 152 | LOG(INFO) << "Connected to vsock:" << FLAGS_vsock_guest_cid << ":" |
| 153 | << FLAGS_vsock_port; |
| 154 | } else { |
| 155 | // Don't log if the previous connection failed with the same error |
| 156 | if (last_failure_reason != vsock_socket->GetErrno()) { |
| 157 | last_failure_reason = vsock_socket->GetErrno(); |
| 158 | LOG(ERROR) << "Unable to connect to vsock server: " |
| 159 | << vsock_socket->StrError(); |
| 160 | } |
Cody Schuffelen | 3ee23ab | 2019-01-15 17:22:35 -0800 | [diff] [blame] | 161 | continue; |
| 162 | } |
Cody Schuffelen | fa69c38 | 2018-12-17 18:57:36 -0800 | [diff] [blame] | 163 | auto thread = std::thread(HandleConnection, std::move(vsock_socket), |
| 164 | std::move(client_socket)); |
| 165 | thread.detach(); |
| 166 | } |
| 167 | } |
| 168 | |
| 169 | #else |
| 170 | cvd::SharedFD OpenSocketConnection() { |
| 171 | while (true) { |
Cody Schuffelen | 2716384 | 2019-02-07 15:36:51 -0800 | [diff] [blame] | 172 | auto sock = cvd::SharedFD::SocketLocalClient(FLAGS_tcp_port, SOCK_STREAM); |
Cody Schuffelen | fa69c38 | 2018-12-17 18:57:36 -0800 | [diff] [blame] | 173 | if (sock->IsOpen()) { |
| 174 | return sock; |
| 175 | } |
Cody Schuffelen | 2716384 | 2019-02-07 15:36:51 -0800 | [diff] [blame] | 176 | LOG(WARNING) << "could not connect on port " << FLAGS_tcp_port |
Cody Schuffelen | fa69c38 | 2018-12-17 18:57:36 -0800 | [diff] [blame] | 177 | << ". sleeping for 1 second"; |
| 178 | sleep(1); |
| 179 | } |
| 180 | } |
| 181 | |
Cody Schuffelen | 3ee23ab | 2019-01-15 17:22:35 -0800 | [diff] [blame] | 182 | bool socketErrorIsRecoverable(int error) { |
| 183 | std::set<int> unrecoverable{EACCES, EAFNOSUPPORT, EINVAL, EPROTONOSUPPORT}; |
| 184 | return unrecoverable.find(error) == unrecoverable.end(); |
| 185 | } |
| 186 | |
| 187 | [[noreturn]] static void SleepForever() { |
| 188 | while (true) { |
| 189 | sleep(std::numeric_limits<unsigned int>::max()); |
| 190 | } |
| 191 | } |
| 192 | |
Cody Schuffelen | fa69c38 | 2018-12-17 18:57:36 -0800 | [diff] [blame] | 193 | [[noreturn]] void guest() { |
| 194 | LOG(INFO) << "Starting guest mainloop"; |
Cody Schuffelen | 2716384 | 2019-02-07 15:36:51 -0800 | [diff] [blame] | 195 | LOG(INFO) << "starting server on " << FLAGS_vsock_port; |
Cody Schuffelen | 3ee23ab | 2019-01-15 17:22:35 -0800 | [diff] [blame] | 196 | cvd::SharedFD vsock; |
| 197 | do { |
Cody Schuffelen | 2716384 | 2019-02-07 15:36:51 -0800 | [diff] [blame] | 198 | vsock = cvd::SharedFD::VsockServer(FLAGS_vsock_port, SOCK_STREAM); |
Cody Schuffelen | 3ee23ab | 2019-01-15 17:22:35 -0800 | [diff] [blame] | 199 | if (!vsock->IsOpen() && !socketErrorIsRecoverable(vsock->GetErrno())) { |
| 200 | LOG(ERROR) << "Could not open vsock socket: " << vsock->StrError(); |
| 201 | SleepForever(); |
| 202 | } |
| 203 | } while (!vsock->IsOpen()); |
Cody Schuffelen | 2716384 | 2019-02-07 15:36:51 -0800 | [diff] [blame] | 204 | CHECK(vsock->IsOpen()) << "Could not start server on " << FLAGS_vsock_port; |
Cody Schuffelen | fa69c38 | 2018-12-17 18:57:36 -0800 | [diff] [blame] | 205 | while (true) { |
| 206 | LOG(INFO) << "waiting for vsock connection"; |
| 207 | auto vsock_client = cvd::SharedFD::Accept(*vsock); |
| 208 | CHECK(vsock_client->IsOpen()) << "error creating vsock socket"; |
| 209 | LOG(INFO) << "vsock socket accepted"; |
| 210 | auto client = OpenSocketConnection(); |
| 211 | CHECK(client->IsOpen()) << "error connecting to guest client"; |
| 212 | auto thread = std::thread(HandleConnection, std::move(vsock_client), |
| 213 | std::move(client)); |
| 214 | thread.detach(); |
| 215 | } |
| 216 | } |
| 217 | |
| 218 | #endif |
| 219 | } // namespace |
| 220 | |
| 221 | int main(int argc, char* argv[]) { |
| 222 | gflags::ParseCommandLineFlags(&argc, &argv, true); |
| 223 | |
Cody Schuffelen | 2716384 | 2019-02-07 15:36:51 -0800 | [diff] [blame] | 224 | CHECK(FLAGS_tcp_port != 0) << "Must specify -tcp_port flag"; |
| 225 | CHECK(FLAGS_vsock_port != 0) << "Must specify -vsock_port flag"; |
Cody Schuffelen | fa69c38 | 2018-12-17 18:57:36 -0800 | [diff] [blame] | 226 | #ifdef CUTTLEFISH_HOST |
Cody Schuffelen | 2716384 | 2019-02-07 15:36:51 -0800 | [diff] [blame] | 227 | CHECK(FLAGS_vsock_guest_cid != 0) << "Must specify -vsock_guest_cid flag"; |
Cody Schuffelen | fa69c38 | 2018-12-17 18:57:36 -0800 | [diff] [blame] | 228 | host(); |
| 229 | #else |
| 230 | guest(); |
| 231 | #endif |
| 232 | } |