1 /* 2 * Copyright (C) 2015 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 17 #define TRACE_TAG ADB 18 19 #include "sysdeps.h" 20 21 #include <signal.h> 22 #include <stdio.h> 23 #include <stdlib.h> 24 #include <unistd.h> 25 26 #include <thread> 27 28 #include <android-base/errors.h> 29 #include <android-base/file.h> 30 #include <android-base/logging.h> 31 #include <android-base/quick_exit.h> 32 #include <android-base/stringprintf.h> 33 34 #include "adb.h" 35 #include "adb_auth.h" 36 #include "adb_listeners.h" 37 #include "adb_utils.h" 38 #include "commandline.h" 39 #include "sysdeps/chrono.h" 40 #include "transport.h" 41 42 static void setup_daemon_logging() { 43 const std::string log_file_path(GetLogFilePath()); 44 int fd = unix_open(log_file_path.c_str(), O_WRONLY | O_CREAT | O_APPEND, 0640); 45 if (fd == -1) { 46 fatal("cannot open '%s': %s", log_file_path.c_str(), strerror(errno)); 47 } 48 if (dup2(fd, STDOUT_FILENO) == -1) { 49 fatal("cannot redirect stdout: %s", strerror(errno)); 50 } 51 if (dup2(fd, STDERR_FILENO) == -1) { 52 fatal("cannot redirect stderr: %s", strerror(errno)); 53 } 54 unix_close(fd); 55 56 fprintf(stderr, "--- adb starting (pid %d) ---\n", getpid()); 57 LOG(INFO) << adb_version(); 58 } 59 60 #if defined(_WIN32) 61 static BOOL WINAPI ctrlc_handler(DWORD type) { 62 // TODO: Consider trying to kill a starting up adb server (if we're in 63 // launch_server) by calling GenerateConsoleCtrlEvent(). 64 android::base::quick_exit(STATUS_CONTROL_C_EXIT); 65 return TRUE; 66 } 67 #endif 68 69 void adb_server_cleanup() { 70 // Upon exit, we want to clean up in the following order: 71 // 1. close_smartsockets, so that we don't get any new clients 72 // 2. kick_all_transports, to avoid writing only part of a packet to a transport. 73 // 3. usb_cleanup, to tear down the USB stack. 74 close_smartsockets(); 75 kick_all_transports(); 76 usb_cleanup(); 77 } 78 79 int adb_server_main(int is_daemon, const std::string& socket_spec, int ack_reply_fd) { 80 #if defined(_WIN32) 81 // adb start-server starts us up with stdout and stderr hooked up to 82 // anonymous pipes. When the C Runtime sees this, it makes stderr and 83 // stdout buffered, but to improve the chance that error output is seen, 84 // unbuffer stdout and stderr just like if we were run at the console. 85 // This also keeps stderr unbuffered when it is redirected to adb.log. 86 if (is_daemon) { 87 if (setvbuf(stdout, NULL, _IONBF, 0) == -1) { 88 fatal("cannot make stdout unbuffered: %s", strerror(errno)); 89 } 90 if (setvbuf(stderr, NULL, _IONBF, 0) == -1) { 91 fatal("cannot make stderr unbuffered: %s", strerror(errno)); 92 } 93 } 94 95 SetConsoleCtrlHandler(ctrlc_handler, TRUE); 96 #else 97 signal(SIGINT, [](int) { 98 fdevent_run_on_main_thread([]() { android::base::quick_exit(0); }); 99 }); 100 #endif 101 102 if (is_daemon) { 103 close_stdin(); 104 setup_daemon_logging(); 105 } 106 107 android::base::at_quick_exit(adb_server_cleanup); 108 109 init_transport_registration(); 110 init_mdns_transport_discovery(); 111 112 usb_init(); 113 local_init(DEFAULT_ADB_LOCAL_TRANSPORT_PORT); 114 115 std::string error; 116 117 auto start = std::chrono::steady_clock::now(); 118 119 // If we told a previous adb server to quit because of version mismatch, we can get to this 120 // point before it's finished exiting. Retry for a while to give it some time. 121 while (install_listener(socket_spec, "*smartsocket*", nullptr, 0, nullptr, &error) != 122 INSTALL_STATUS_OK) { 123 if (std::chrono::steady_clock::now() - start > 0.5s) { 124 fatal("could not install *smartsocket* listener: %s", error.c_str()); 125 } 126 127 std::this_thread::sleep_for(100ms); 128 } 129 130 adb_auth_init(); 131 132 if (is_daemon) { 133 #if !defined(_WIN32) 134 // Start a new session for the daemon. Do this here instead of after the fork so 135 // that a ctrl-c between the "starting server" and "done starting server" messages 136 // gets a chance to terminate the server. 137 // setsid will fail with EPERM if it's already been a lead process of new session. 138 // Ignore such error. 139 if (setsid() == -1 && errno != EPERM) { 140 fatal("setsid() failed: %s", strerror(errno)); 141 } 142 #endif 143 144 // Wait for the USB scan to complete before notifying the parent that we're up. 145 // We need to perform this in a thread, because we would otherwise block the event loop. 146 std::thread notify_thread([ack_reply_fd]() { 147 adb_wait_for_device_initialization(); 148 149 // Any error output written to stderr now goes to adb.log. We could 150 // keep around a copy of the stderr fd and use that to write any errors 151 // encountered by the following code, but that is probably overkill. 152 #if defined(_WIN32) 153 const HANDLE ack_reply_handle = cast_int_to_handle(ack_reply_fd); 154 const CHAR ack[] = "OK\n"; 155 const DWORD bytes_to_write = arraysize(ack) - 1; 156 DWORD written = 0; 157 if (!WriteFile(ack_reply_handle, ack, bytes_to_write, &written, NULL)) { 158 fatal("adb: cannot write ACK to handle 0x%p: %s", ack_reply_handle, 159 android::base::SystemErrorCodeToString(GetLastError()).c_str()); 160 } 161 if (written != bytes_to_write) { 162 fatal("adb: cannot write %lu bytes of ACK: only wrote %lu bytes", bytes_to_write, 163 written); 164 } 165 CloseHandle(ack_reply_handle); 166 #else 167 // TODO(danalbert): Can't use SendOkay because we're sending "OK\n", not 168 // "OKAY". 169 if (!android::base::WriteStringToFd("OK\n", ack_reply_fd)) { 170 fatal_errno("error writing ACK to fd %d", ack_reply_fd); 171 } 172 unix_close(ack_reply_fd); 173 #endif 174 }); 175 notify_thread.detach(); 176 } 177 178 D("Event loop starting"); 179 fdevent_loop(); 180 181 return 0; 182 } 183 184 int main(int argc, char** argv) { 185 adb_trace_init(argv); 186 return adb_commandline(argc - 1, const_cast<const char**>(argv + 1)); 187 } 188