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/stringprintf.h>
32
33 #include "adb.h"
34 #include "adb_auth.h"
35 #include "adb_client.h"
36 #include "adb_listeners.h"
37 #include "adb_utils.h"
38 #include "adb_wifi.h"
39 #include "client/usb.h"
40 #include "commandline.h"
41 #include "sysdeps/chrono.h"
42 #include "transport.h"
43
44 const char** __adb_argv;
45 const char** __adb_envp;
46
setup_daemon_logging()47 static void setup_daemon_logging() {
48 const std::string log_file_path(GetLogFilePath());
49 int fd = unix_open(log_file_path, O_WRONLY | O_CREAT | O_APPEND, 0640);
50 if (fd == -1) {
51 PLOG(FATAL) << "cannot open " << log_file_path;
52 }
53 if (dup2(fd, STDOUT_FILENO) == -1) {
54 PLOG(FATAL) << "cannot redirect stdout";
55 }
56 if (dup2(fd, STDERR_FILENO) == -1) {
57 PLOG(FATAL) << "cannot redirect stderr";
58 }
59 unix_close(fd);
60
61 fprintf(stderr, "--- adb starting (pid %d) ---\n", getpid());
62 LOG(INFO) << adb_version();
63 }
64
adb_server_cleanup()65 void adb_server_cleanup() {
66 // Upon exit, we want to clean up in the following order:
67 // 1. close_smartsockets, so that we don't get any new clients
68 // 2. kick_all_transports, to avoid writing only part of a packet to a transport.
69 // 3. usb_cleanup, to tear down the USB stack.
70 close_smartsockets();
71 kick_all_transports();
72 usb_cleanup();
73 }
74
intentionally_leak()75 static void intentionally_leak() {
76 void* p = ::operator new(1);
77 // The analyzer is upset about this leaking. NOLINTNEXTLINE
78 LOG(INFO) << "leaking pointer " << p;
79 }
80
adb_server_main(int is_daemon,const std::string & socket_spec,int ack_reply_fd)81 int adb_server_main(int is_daemon, const std::string& socket_spec, int ack_reply_fd) {
82 #if defined(_WIN32)
83 // adb start-server starts us up with stdout and stderr hooked up to
84 // anonymous pipes. When the C Runtime sees this, it makes stderr and
85 // stdout buffered, but to improve the chance that error output is seen,
86 // unbuffer stdout and stderr just like if we were run at the console.
87 // This also keeps stderr unbuffered when it is redirected to adb.log.
88 if (is_daemon) {
89 if (setvbuf(stdout, nullptr, _IONBF, 0) == -1) {
90 PLOG(FATAL) << "cannot make stdout unbuffered";
91 }
92 if (setvbuf(stderr, nullptr, _IONBF, 0) == -1) {
93 PLOG(FATAL) << "cannot make stderr unbuffered";
94 }
95 }
96
97 // TODO: On Ctrl-C, consider trying to kill a starting up adb server (if we're in
98 // launch_server) by calling GenerateConsoleCtrlEvent().
99
100 // On Windows, SIGBREAK is when Ctrl-Break is pressed or the console window is closed. It should
101 // act like Ctrl-C.
102 signal(SIGBREAK, [](int) { raise(SIGINT); });
103 #endif
104 signal(SIGINT, [](int) {
105 fdevent_run_on_main_thread([]() { exit(0); });
106 });
107
108 char* leak = getenv("ADB_LEAK");
109 if (leak && strcmp(leak, "1") == 0) {
110 intentionally_leak();
111 }
112
113 if (is_daemon) {
114 close_stdin();
115 setup_daemon_logging();
116 }
117
118 atexit(adb_server_cleanup);
119
120 init_transport_registration();
121 init_reconnect_handler();
122
123 adb_wifi_init();
124 if (!getenv("ADB_MDNS") || strcmp(getenv("ADB_MDNS"), "0") != 0) {
125 init_mdns_transport_discovery();
126 }
127
128 if (!getenv("ADB_USB") || strcmp(getenv("ADB_USB"), "0") != 0) {
129 usb_init();
130 } else {
131 adb_notify_device_scan_complete();
132 }
133
134 if (!getenv("ADB_EMU") || strcmp(getenv("ADB_EMU"), "0") != 0) {
135 local_init(android::base::StringPrintf("tcp:%d", DEFAULT_ADB_LOCAL_TRANSPORT_PORT));
136 }
137
138 std::string error;
139
140 auto start = std::chrono::steady_clock::now();
141
142 // If we told a previous adb server to quit because of version mismatch, we can get to this
143 // point before it's finished exiting. Retry for a while to give it some time.
144 while (install_listener(socket_spec, "*smartsocket*", nullptr, 0, nullptr, &error) !=
145 INSTALL_STATUS_OK) {
146 if (std::chrono::steady_clock::now() - start > 0.5s) {
147 LOG(FATAL) << "could not install *smartsocket* listener: " << error;
148 }
149
150 std::this_thread::sleep_for(100ms);
151 }
152
153 adb_auth_init();
154
155 if (is_daemon) {
156 #if !defined(_WIN32)
157 // Start a new session for the daemon. Do this here instead of after the fork so
158 // that a ctrl-c between the "starting server" and "done starting server" messages
159 // gets a chance to terminate the server.
160 // setsid will fail with EPERM if it's already been a lead process of new session.
161 // Ignore such error.
162 if (setsid() == -1 && errno != EPERM) {
163 PLOG(FATAL) << "setsid() failed";
164 }
165 #endif
166
167 // Wait for the USB scan to complete before notifying the parent that we're up.
168 // We need to perform this in a thread, because we would otherwise block the event loop.
169 std::thread notify_thread([ack_reply_fd]() {
170 adb_wait_for_device_initialization();
171
172 // Any error output written to stderr now goes to adb.log. We could
173 // keep around a copy of the stderr fd and use that to write any errors
174 // encountered by the following code, but that is probably overkill.
175 #if defined(_WIN32)
176 const HANDLE ack_reply_handle = cast_int_to_handle(ack_reply_fd);
177 const CHAR ack[] = "OK\n";
178 const DWORD bytes_to_write = arraysize(ack) - 1;
179 DWORD written = 0;
180 if (!WriteFile(ack_reply_handle, ack, bytes_to_write, &written, NULL)) {
181 LOG(FATAL) << "cannot write ACK to handle " << ack_reply_handle
182 << android::base::SystemErrorCodeToString(GetLastError());
183 }
184 if (written != bytes_to_write) {
185 LOG(FATAL) << "cannot write " << bytes_to_write << " bytes of ACK: only wrote "
186 << written << " bytes";
187 }
188 CloseHandle(ack_reply_handle);
189 #else
190 // TODO(danalbert): Can't use SendOkay because we're sending "OK\n", not
191 // "OKAY".
192 if (!android::base::WriteStringToFd("OK\n", ack_reply_fd)) {
193 PLOG(FATAL) << "error writing ACK to fd " << ack_reply_fd;
194 }
195 unix_close(ack_reply_fd);
196 #endif
197 });
198 notify_thread.detach();
199 }
200
201 #if defined(__linux__)
202 // Write our location to .android/adb.$PORT, so that older clients can exec us.
203 std::string path;
204 if (!android::base::Readlink("/proc/self/exe", &path)) {
205 PLOG(ERROR) << "failed to readlink /proc/self/exe";
206 }
207
208 std::optional<std::string> server_executable_path = adb_get_server_executable_path();
209 if (server_executable_path) {
210 if (!android::base::WriteStringToFile(path, *server_executable_path)) {
211 PLOG(ERROR) << "failed to write server path to " << path;
212 }
213 }
214 #endif
215
216 D("Event loop starting");
217 fdevent_loop();
218 return 0;
219 }
220
main(int argc,char * argv[],char * envp[])221 int main(int argc, char* argv[], char* envp[]) {
222 __adb_argv = const_cast<const char**>(argv);
223 __adb_envp = const_cast<const char**>(envp);
224 adb_trace_init(argv);
225 return adb_commandline(argc - 1, const_cast<const char**>(argv + 1));
226 }
227