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
17 #define TRACE_TAG SERVICES
18
19 #include "sysdeps.h"
20
21 #include <errno.h>
22 #include <netdb.h>
23 #include <netinet/in.h>
24 #include <stddef.h>
25 #include <stdio.h>
26 #include <stdlib.h>
27 #include <string.h>
28 #include <sys/ioctl.h>
29 #include <sys/socket.h>
30 #include <sys/un.h>
31 #include <termios.h>
32 #include <unistd.h>
33
34 #include <thread>
35
36 #include <android-base/file.h>
37 #include <android-base/parseint.h>
38 #include <android-base/parsenetaddress.h>
39 #include <android-base/properties.h>
40 #include <android-base/stringprintf.h>
41 #include <android-base/strings.h>
42 #include <android-base/unique_fd.h>
43 #include <cutils/android_reboot.h>
44 #include <cutils/sockets.h>
45 #include <log/log_properties.h>
46
47 #include "adb.h"
48 #include "adb_io.h"
49 #include "adb_unique_fd.h"
50 #include "adb_utils.h"
51 #include "services.h"
52 #include "socket_spec.h"
53 #include "sysdeps.h"
54 #include "transport.h"
55
56 #include "daemon/file_sync_service.h"
57 #include "daemon/framebuffer_service.h"
58 #include "daemon/jdwp_service.h"
59 #include "daemon/logging.h"
60 #include "daemon/restart_service.h"
61 #include "daemon/shell_service.h"
62
reconnect_service(unique_fd fd,atransport * t)63 void reconnect_service(unique_fd fd, atransport* t) {
64 WriteFdExactly(fd.get(), "done");
65 kick_transport(t);
66 }
67
reverse_service(std::string_view command,atransport * transport)68 unique_fd reverse_service(std::string_view command, atransport* transport) {
69 // TODO: Switch handle_forward_request to std::string_view.
70 std::string str(command);
71
72 int s[2];
73 if (adb_socketpair(s)) {
74 PLOG(ERROR) << "cannot create service socket pair.";
75 return unique_fd{};
76 }
77 VLOG(SERVICES) << "service socketpair: " << s[0] << ", " << s[1];
78 if (!handle_forward_request(str.c_str(), transport, s[1])) {
79 SendFail(s[1], "not a reverse forwarding command");
80 }
81 adb_close(s[1]);
82 return unique_fd{s[0]};
83 }
84
85 // Shell service string can look like:
86 // shell[,arg1,arg2,...]:[command]
ShellService(std::string_view args,const atransport * transport)87 unique_fd ShellService(std::string_view args, const atransport* transport) {
88 size_t delimiter_index = args.find(':');
89 if (delimiter_index == std::string::npos) {
90 LOG(ERROR) << "No ':' found in shell service arguments: " << args;
91 return unique_fd{};
92 }
93
94 // TODO: android::base::Split(const std::string_view&, ...)
95 std::string service_args(args.substr(0, delimiter_index));
96 std::string command(args.substr(delimiter_index + 1));
97
98 // Defaults:
99 // PTY for interactive, raw for non-interactive.
100 // No protocol.
101 // $TERM set to "dumb".
102 SubprocessType type(command.empty() ? SubprocessType::kPty : SubprocessType::kRaw);
103 SubprocessProtocol protocol = SubprocessProtocol::kNone;
104 std::string terminal_type = "dumb";
105
106 for (const std::string& arg : android::base::Split(service_args, ",")) {
107 if (arg == kShellServiceArgRaw) {
108 type = SubprocessType::kRaw;
109 } else if (arg == kShellServiceArgPty) {
110 type = SubprocessType::kPty;
111 } else if (arg == kShellServiceArgShellProtocol) {
112 protocol = SubprocessProtocol::kShell;
113 } else if (arg.starts_with("TERM=")) {
114 terminal_type = arg.substr(strlen("TERM="));
115 } else if (!arg.empty()) {
116 // This is not an error to allow for future expansion.
117 LOG(WARNING) << "Ignoring unknown shell service argument: " << arg;
118 }
119 }
120
121 return StartSubprocess(command, terminal_type.c_str(), type, protocol);
122 }
123
spin_service(unique_fd fd)124 static void spin_service(unique_fd fd) {
125 if (!__android_log_is_debuggable()) {
126 WriteFdExactly(fd.get(), "refusing to spin on non-debuggable build\n");
127 return;
128 }
129
130 // A service that creates an fdevent that's always pending, and then ignores it.
131 unique_fd pipe_read, pipe_write;
132 if (!Pipe(&pipe_read, &pipe_write)) {
133 WriteFdExactly(fd.get(), "failed to create pipe\n");
134 return;
135 }
136
137 fdevent_run_on_looper([fd = pipe_read.release()]() {
138 fdevent* fde = fdevent_create(
139 fd, [](int, unsigned, void*) {}, nullptr);
140 fdevent_add(fde, FDE_READ);
141 });
142
143 WriteFdExactly(fd.get(), "spinning\n");
144 }
145
reboot_device(const std::string & name)146 [[maybe_unused]] static unique_fd reboot_device(const std::string& name) {
147 #if defined(__ANDROID_RECOVERY__)
148 if (!__android_log_is_debuggable()) {
149 auto reboot_service = [name](unique_fd fd) {
150 std::string reboot_string = android::base::StringPrintf("reboot,%s", name.c_str());
151 if (!android::base::SetProperty(ANDROID_RB_PROPERTY, reboot_string)) {
152 WriteFdFmt(fd.get(), "reboot (%s) failed\n", reboot_string.c_str());
153 return;
154 }
155 while (true) pause();
156 };
157 return create_service_thread("reboot", reboot_service);
158 }
159 #endif
160 // Fall through
161 std::string cmd = "/system/bin/reboot ";
162 cmd += name;
163 return StartSubprocess(cmd, nullptr, SubprocessType::kRaw, SubprocessProtocol::kNone);
164 }
165
166 struct ServiceSocket : public asocket {
167 ServiceSocket() = delete;
ServiceSocketServiceSocket168 explicit ServiceSocket(atransport* transport) {
169 CHECK(transport);
170 install_local_socket(this);
171 this->transport = transport;
172 this->enqueue = [](asocket* self, apacket::payload_type data) {
173 // TODO: This interface currently can't give any backpressure.
174 send_ready(self->id, self->peer->id, self->transport, data.size());
175 return static_cast<ServiceSocket*>(self)->Enqueue(std::move(data));
176 };
177 this->ready = [](asocket* self) { return static_cast<ServiceSocket*>(self)->Ready(); };
178 this->close = [](asocket* self) { return static_cast<ServiceSocket*>(self)->Close(); };
179 }
180 virtual ~ServiceSocket() = default;
181
182 ServiceSocket(const ServiceSocket& copy) = delete;
183 ServiceSocket(ServiceSocket&& move) = delete;
184 ServiceSocket& operator=(const ServiceSocket& copy) = delete;
185 ServiceSocket& operator=(ServiceSocket&& move) = delete;
186
EnqueueServiceSocket187 virtual int Enqueue(apacket::payload_type data) { return -1; }
ReadyServiceSocket188 virtual void Ready() {}
CloseServiceSocket189 virtual void Close() {
190 if (peer) {
191 peer->peer = nullptr;
192 if (peer->shutdown) {
193 peer->shutdown(peer);
194 }
195 peer->close(peer);
196 }
197
198 remove_socket(this);
199 delete this;
200 }
201 };
202
203 struct SinkSocket : public ServiceSocket {
SinkSocketSinkSocket204 explicit SinkSocket(atransport* transport, size_t byte_count)
205 : ServiceSocket(transport), bytes_left_(byte_count) {
206 LOG(INFO) << "Creating new SinkSocket with capacity " << byte_count;
207 }
208
~SinkSocketSinkSocket209 virtual ~SinkSocket() { LOG(INFO) << "SinkSocket destroyed"; }
210
EnqueueSinkSocket211 virtual int Enqueue(apacket::payload_type data) override final {
212 if (bytes_left_ <= data.size()) {
213 // Done reading.
214 Close();
215 return -1;
216 }
217
218 bytes_left_ -= data.size();
219 return 0;
220 }
221
222 size_t bytes_left_;
223 };
224
225 struct SourceSocket : public ServiceSocket {
SourceSocketSourceSocket226 explicit SourceSocket(atransport* transport, size_t byte_count)
227 : ServiceSocket(transport), bytes_left_(byte_count) {
228 LOG(INFO) << "Creating new SourceSocket with capacity " << byte_count;
229 }
230
~SourceSocketSourceSocket231 virtual ~SourceSocket() { LOG(INFO) << "SourceSocket destroyed"; }
232
ReadySourceSocket233 void Ready() {
234 size_t len = std::min(bytes_left_, get_max_payload());
235 if (len == 0) {
236 Close();
237 return;
238 }
239
240 Block block(len);
241 memset(block.data(), 0, block.size());
242 peer->enqueue(peer, std::move(block));
243 bytes_left_ -= len;
244 }
245
EnqueueSourceSocket246 int Enqueue(apacket::payload_type data) { return -1; }
247
248 size_t bytes_left_;
249 };
250
daemon_service_to_socket(std::string_view name,atransport * transport)251 asocket* daemon_service_to_socket(std::string_view name, atransport* transport) {
252 if (name == "jdwp") {
253 return create_jdwp_service_socket();
254 } else if (name == "track-jdwp") {
255 return create_jdwp_tracker_service_socket();
256 } else if (name == "track-app") {
257 return create_app_tracker_service_socket();
258 } else if (android::base::ConsumePrefix(&name, "sink:")) {
259 uint64_t byte_count = 0;
260 if (!ParseUint(&byte_count, name)) {
261 return nullptr;
262 }
263 return new SinkSocket(transport, byte_count);
264 } else if (android::base::ConsumePrefix(&name, "source:")) {
265 uint64_t byte_count = 0;
266 if (!ParseUint(&byte_count, name)) {
267 return nullptr;
268 }
269 return new SourceSocket(transport, byte_count);
270 }
271
272 return nullptr;
273 }
274
daemon_service_to_fd(std::string_view name,atransport * transport)275 unique_fd daemon_service_to_fd(std::string_view name, atransport* transport) {
276 ADB_LOG(Service) << "transport " << transport->serial_name() << " opening service " << name;
277
278 #if defined(__ANDROID__) && !defined(__ANDROID_RECOVERY__)
279 if (name.starts_with("abb:") || name.starts_with("abb_exec:")) {
280 return execute_abb_command(name);
281 }
282 #endif
283
284 #if defined(__ANDROID__)
285 if (name.starts_with("framebuffer:")) {
286 return create_service_thread("fb", framebuffer_service);
287 } else if (android::base::ConsumePrefix(&name, "remount:")) {
288 std::string cmd = "/system/bin/remount ";
289 cmd += name;
290 return StartSubprocess(cmd, nullptr, SubprocessType::kRaw, SubprocessProtocol::kNone);
291 } else if (android::base::ConsumePrefix(&name, "reboot:")) {
292 return reboot_device(std::string(name));
293 } else if (name.starts_with("root:")) {
294 return create_service_thread("root", restart_root_service);
295 } else if (name.starts_with("unroot:")) {
296 return create_service_thread("unroot", restart_unroot_service);
297 } else if (android::base::ConsumePrefix(&name, "backup:")) {
298 std::string cmd = "/system/bin/bu backup ";
299 cmd += name;
300 return StartSubprocess(cmd, nullptr, SubprocessType::kRaw, SubprocessProtocol::kNone);
301 } else if (name.starts_with("restore:")) {
302 return StartSubprocess("/system/bin/bu restore", nullptr, SubprocessType::kRaw,
303 SubprocessProtocol::kNone);
304 } else if (name.starts_with("disable-verity:")) {
305 return StartSubprocess("/system/bin/disable-verity", nullptr, SubprocessType::kRaw,
306 SubprocessProtocol::kNone);
307 } else if (name.starts_with("enable-verity:")) {
308 return StartSubprocess("/system/bin/enable-verity", nullptr, SubprocessType::kRaw,
309 SubprocessProtocol::kNone);
310 } else if (android::base::ConsumePrefix(&name, "tcpip:")) {
311 std::string str(name);
312
313 int port;
314 if (sscanf(str.c_str(), "%d", &port) != 1) {
315 return unique_fd{};
316 }
317 return create_service_thread("tcp",
318 std::bind(restart_tcp_service, std::placeholders::_1, port));
319 } else if (name.starts_with("usb:")) {
320 return create_service_thread("usb", restart_usb_service);
321 }
322 #endif
323
324 if (android::base::ConsumePrefix(&name, "dev:")) {
325 return unique_fd{unix_open(name, O_RDWR | O_CLOEXEC)};
326 } else if (android::base::ConsumePrefix(&name, "dev-raw:")) {
327 android::base::unique_fd fd(unix_open(name, O_RDWR | O_CLOEXEC));
328 termios tattr;
329
330 if (fd == -1) {
331 return unique_fd{};
332 }
333
334 if (tcgetattr(fd.get(), &tattr) == -1) {
335 return unique_fd{};
336 }
337 cfmakeraw(&tattr);
338 if (tcsetattr(fd.get(), TCSADRAIN, &tattr) == -1) {
339 return unique_fd{};
340 }
341
342 return fd;
343 } else if (android::base::ConsumePrefix(&name, "jdwp:")) {
344 pid_t pid;
345 if (!ParseUint(&pid, name)) {
346 return unique_fd{};
347 }
348 return create_jdwp_connection_fd(pid);
349 } else if (android::base::ConsumePrefix(&name, "shell")) {
350 return ShellService(name, transport);
351 } else if (android::base::ConsumePrefix(&name, "exec:")) {
352 return StartSubprocess(std::string(name), nullptr, SubprocessType::kRaw,
353 SubprocessProtocol::kNone);
354 } else if (name.starts_with("sync:")) {
355 return create_service_thread("sync", file_sync_service);
356 } else if (android::base::ConsumePrefix(&name, "reverse:")) {
357 return reverse_service(name, transport);
358 } else if (name == "reconnect") {
359 return create_service_thread(
360 "reconnect", std::bind(reconnect_service, std::placeholders::_1, transport));
361 } else if (name == "spin") {
362 return create_service_thread("spin", spin_service);
363 }
364
365 return unique_fd{};
366 }
367