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 <unistd.h>
32
33 #include <thread>
34
35 #include <android-base/file.h>
36 #include <android-base/parseint.h>
37 #include <android-base/parsenetaddress.h>
38 #include <android-base/properties.h>
39 #include <android-base/stringprintf.h>
40 #include <android-base/strings.h>
41 #include <android-base/unique_fd.h>
42 #include <cutils/android_reboot.h>
43 #include <cutils/sockets.h>
44 #include <log/log_properties.h>
45
46 #include "adb.h"
47 #include "adb_io.h"
48 #include "adb_unique_fd.h"
49 #include "adb_utils.h"
50 #include "services.h"
51 #include "socket_spec.h"
52 #include "sysdeps.h"
53 #include "transport.h"
54
55 #include "daemon/file_sync_service.h"
56 #include "daemon/framebuffer_service.h"
57 #include "daemon/logging.h"
58 #include "daemon/restart_service.h"
59 #include "daemon/shell_service.h"
60
reconnect_service(unique_fd fd,atransport * t)61 void reconnect_service(unique_fd fd, atransport* t) {
62 WriteFdExactly(fd.get(), "done");
63 kick_transport(t);
64 }
65
reverse_service(std::string_view command,atransport * transport)66 unique_fd reverse_service(std::string_view command, atransport* transport) {
67 // TODO: Switch handle_forward_request to std::string_view.
68 std::string str(command);
69
70 int s[2];
71 if (adb_socketpair(s)) {
72 PLOG(ERROR) << "cannot create service socket pair.";
73 return unique_fd{};
74 }
75 VLOG(SERVICES) << "service socketpair: " << s[0] << ", " << s[1];
76 if (!handle_forward_request(str.c_str(), transport, s[1])) {
77 SendFail(s[1], "not a reverse forwarding command");
78 }
79 adb_close(s[1]);
80 return unique_fd{s[0]};
81 }
82
83 // Shell service string can look like:
84 // shell[,arg1,arg2,...]:[command]
ShellService(std::string_view args,const atransport * transport)85 unique_fd ShellService(std::string_view args, const atransport* transport) {
86 size_t delimiter_index = args.find(':');
87 if (delimiter_index == std::string::npos) {
88 LOG(ERROR) << "No ':' found in shell service arguments: " << args;
89 return unique_fd{};
90 }
91
92 // TODO: android::base::Split(const std::string_view&, ...)
93 std::string service_args(args.substr(0, delimiter_index));
94 std::string command(args.substr(delimiter_index + 1));
95
96 // Defaults:
97 // PTY for interactive, raw for non-interactive.
98 // No protocol.
99 // $TERM set to "dumb".
100 SubprocessType type(command.empty() ? SubprocessType::kPty : SubprocessType::kRaw);
101 SubprocessProtocol protocol = SubprocessProtocol::kNone;
102 std::string terminal_type = "dumb";
103
104 for (const std::string& arg : android::base::Split(service_args, ",")) {
105 if (arg == kShellServiceArgRaw) {
106 type = SubprocessType::kRaw;
107 } else if (arg == kShellServiceArgPty) {
108 type = SubprocessType::kPty;
109 } else if (arg == kShellServiceArgShellProtocol) {
110 protocol = SubprocessProtocol::kShell;
111 } else if (arg.starts_with("TERM=")) {
112 terminal_type = arg.substr(strlen("TERM="));
113 } else if (!arg.empty()) {
114 // This is not an error to allow for future expansion.
115 LOG(WARNING) << "Ignoring unknown shell service argument: " << arg;
116 }
117 }
118
119 return StartSubprocess(command, terminal_type.c_str(), type, protocol);
120 }
121
spin_service(unique_fd fd)122 static void spin_service(unique_fd fd) {
123 if (!__android_log_is_debuggable()) {
124 WriteFdExactly(fd.get(), "refusing to spin on non-debuggable build\n");
125 return;
126 }
127
128 // A service that creates an fdevent that's always pending, and then ignores it.
129 unique_fd pipe_read, pipe_write;
130 if (!Pipe(&pipe_read, &pipe_write)) {
131 WriteFdExactly(fd.get(), "failed to create pipe\n");
132 return;
133 }
134
135 fdevent_run_on_main_thread([fd = pipe_read.release()]() {
136 fdevent* fde = fdevent_create(
137 fd, [](int, unsigned, void*) {}, nullptr);
138 fdevent_add(fde, FDE_READ);
139 });
140
141 WriteFdExactly(fd.get(), "spinning\n");
142 }
143
reboot_device(const std::string & name)144 [[maybe_unused]] static unique_fd reboot_device(const std::string& name) {
145 #if defined(__ANDROID_RECOVERY__)
146 if (!__android_log_is_debuggable()) {
147 auto reboot_service = [name](unique_fd fd) {
148 std::string reboot_string = android::base::StringPrintf("reboot,%s", name.c_str());
149 if (!android::base::SetProperty(ANDROID_RB_PROPERTY, reboot_string)) {
150 WriteFdFmt(fd.get(), "reboot (%s) failed\n", reboot_string.c_str());
151 return;
152 }
153 while (true) pause();
154 };
155 return create_service_thread("reboot", reboot_service);
156 }
157 #endif
158 // Fall through
159 std::string cmd = "/system/bin/reboot ";
160 cmd += name;
161 return StartSubprocess(cmd, nullptr, SubprocessType::kRaw, SubprocessProtocol::kNone);
162 }
163
164 struct ServiceSocket : public asocket {
ServiceSocketServiceSocket165 ServiceSocket() {
166 install_local_socket(this);
167 this->enqueue = [](asocket* self, apacket::payload_type data) {
168 return static_cast<ServiceSocket*>(self)->Enqueue(std::move(data));
169 };
170 this->ready = [](asocket* self) { return static_cast<ServiceSocket*>(self)->Ready(); };
171 this->close = [](asocket* self) { return static_cast<ServiceSocket*>(self)->Close(); };
172 }
173 virtual ~ServiceSocket() = default;
174
EnqueueServiceSocket175 virtual int Enqueue(apacket::payload_type data) { return -1; }
ReadyServiceSocket176 virtual void Ready() {}
CloseServiceSocket177 virtual void Close() {
178 if (peer) {
179 peer->peer = nullptr;
180 if (peer->shutdown) {
181 peer->shutdown(peer);
182 }
183 peer->close(peer);
184 }
185
186 remove_socket(this);
187 delete this;
188 }
189 };
190
191 struct SinkSocket : public ServiceSocket {
SinkSocketSinkSocket192 explicit SinkSocket(size_t byte_count) {
193 LOG(INFO) << "Creating new SinkSocket with capacity " << byte_count;
194 bytes_left_ = byte_count;
195 }
196
~SinkSocketSinkSocket197 virtual ~SinkSocket() { LOG(INFO) << "SinkSocket destroyed"; }
198
EnqueueSinkSocket199 virtual int Enqueue(apacket::payload_type data) override final {
200 if (bytes_left_ <= data.size()) {
201 // Done reading.
202 Close();
203 return -1;
204 }
205
206 bytes_left_ -= data.size();
207 return 0;
208 }
209
210 size_t bytes_left_;
211 };
212
213 struct SourceSocket : public ServiceSocket {
SourceSocketSourceSocket214 explicit SourceSocket(size_t byte_count) {
215 LOG(INFO) << "Creating new SourceSocket with capacity " << byte_count;
216 bytes_left_ = byte_count;
217 }
218
~SourceSocketSourceSocket219 virtual ~SourceSocket() { LOG(INFO) << "SourceSocket destroyed"; }
220
ReadySourceSocket221 void Ready() {
222 size_t len = std::min(bytes_left_, get_max_payload());
223 if (len == 0) {
224 Close();
225 return;
226 }
227
228 Block block(len);
229 memset(block.data(), 0, block.size());
230 peer->enqueue(peer, std::move(block));
231 bytes_left_ -= len;
232 }
233
EnqueueSourceSocket234 int Enqueue(apacket::payload_type data) { return -1; }
235
236 size_t bytes_left_;
237 };
238
daemon_service_to_socket(std::string_view name)239 asocket* daemon_service_to_socket(std::string_view name) {
240 if (name == "jdwp") {
241 return create_jdwp_service_socket();
242 } else if (name == "track-jdwp") {
243 return create_jdwp_tracker_service_socket();
244 } else if (name == "track-app") {
245 return create_app_tracker_service_socket();
246 } else if (android::base::ConsumePrefix(&name, "sink:")) {
247 uint64_t byte_count = 0;
248 if (!ParseUint(&byte_count, name)) {
249 return nullptr;
250 }
251 return new SinkSocket(byte_count);
252 } else if (android::base::ConsumePrefix(&name, "source:")) {
253 uint64_t byte_count = 0;
254 if (!ParseUint(&byte_count, name)) {
255 return nullptr;
256 }
257 return new SourceSocket(byte_count);
258 }
259
260 return nullptr;
261 }
262
daemon_service_to_fd(std::string_view name,atransport * transport)263 unique_fd daemon_service_to_fd(std::string_view name, atransport* transport) {
264 ADB_LOG(Service) << "transport " << transport->serial_name() << " opening service " << name;
265
266 #if defined(__ANDROID__) && !defined(__ANDROID_RECOVERY__)
267 if (name.starts_with("abb:") || name.starts_with("abb_exec:")) {
268 return execute_abb_command(name);
269 }
270 #endif
271
272 #if defined(__ANDROID__)
273 if (name.starts_with("framebuffer:")) {
274 return create_service_thread("fb", framebuffer_service);
275 } else if (android::base::ConsumePrefix(&name, "remount:")) {
276 std::string cmd = "/system/bin/remount ";
277 cmd += name;
278 return StartSubprocess(cmd, nullptr, SubprocessType::kRaw, SubprocessProtocol::kNone);
279 } else if (android::base::ConsumePrefix(&name, "reboot:")) {
280 return reboot_device(std::string(name));
281 } else if (name.starts_with("root:")) {
282 return create_service_thread("root", restart_root_service);
283 } else if (name.starts_with("unroot:")) {
284 return create_service_thread("unroot", restart_unroot_service);
285 } else if (android::base::ConsumePrefix(&name, "backup:")) {
286 std::string cmd = "/system/bin/bu backup ";
287 cmd += name;
288 return StartSubprocess(cmd, nullptr, SubprocessType::kRaw, SubprocessProtocol::kNone);
289 } else if (name.starts_with("restore:")) {
290 return StartSubprocess("/system/bin/bu restore", nullptr, SubprocessType::kRaw,
291 SubprocessProtocol::kNone);
292 } else if (name.starts_with("disable-verity:")) {
293 return StartSubprocess("/system/bin/disable-verity", nullptr, SubprocessType::kRaw,
294 SubprocessProtocol::kNone);
295 } else if (name.starts_with("enable-verity:")) {
296 return StartSubprocess("/system/bin/enable-verity", nullptr, SubprocessType::kRaw,
297 SubprocessProtocol::kNone);
298 } else if (android::base::ConsumePrefix(&name, "tcpip:")) {
299 std::string str(name);
300
301 int port;
302 if (sscanf(str.c_str(), "%d", &port) != 1) {
303 return unique_fd{};
304 }
305 return create_service_thread("tcp",
306 std::bind(restart_tcp_service, std::placeholders::_1, port));
307 } else if (name.starts_with("usb:")) {
308 return create_service_thread("usb", restart_usb_service);
309 }
310 #endif
311
312 if (android::base::ConsumePrefix(&name, "dev:")) {
313 return unique_fd{unix_open(name, O_RDWR | O_CLOEXEC)};
314 } else if (android::base::ConsumePrefix(&name, "jdwp:")) {
315 pid_t pid;
316 if (!ParseUint(&pid, name)) {
317 return unique_fd{};
318 }
319 return create_jdwp_connection_fd(pid);
320 } else if (android::base::ConsumePrefix(&name, "shell")) {
321 return ShellService(name, transport);
322 } else if (android::base::ConsumePrefix(&name, "exec:")) {
323 return StartSubprocess(std::string(name), nullptr, SubprocessType::kRaw,
324 SubprocessProtocol::kNone);
325 } else if (name.starts_with("sync:")) {
326 return create_service_thread("sync", file_sync_service);
327 } else if (android::base::ConsumePrefix(&name, "reverse:")) {
328 return reverse_service(name, transport);
329 } else if (name == "reconnect") {
330 return create_service_thread(
331 "reconnect", std::bind(reconnect_service, std::placeholders::_1, transport));
332 } else if (name == "spin") {
333 return create_service_thread("spin", spin_service);
334 }
335
336 return unique_fd{};
337 }
338