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/sockets.h>
43 #include <log/log_properties.h>
44
45 #include "adb.h"
46 #include "adb_io.h"
47 #include "adb_unique_fd.h"
48 #include "adb_utils.h"
49 #include "services.h"
50 #include "socket_spec.h"
51 #include "sysdeps.h"
52 #include "transport.h"
53
54 #include "daemon/file_sync_service.h"
55 #include "daemon/framebuffer_service.h"
56 #include "daemon/reboot_service.h"
57 #include "daemon/restart_service.h"
58 #include "daemon/set_verity_enable_state_service.h"
59 #include "daemon/shell_service.h"
60
61
reconnect_service(unique_fd fd,atransport * t)62 void reconnect_service(unique_fd fd, atransport* t) {
63 WriteFdExactly(fd.get(), "done");
64 kick_transport(t);
65 }
66
reverse_service(std::string_view command,atransport * transport)67 unique_fd reverse_service(std::string_view command, atransport* transport) {
68 // TODO: Switch handle_forward_request to std::string_view.
69 std::string str(command);
70
71 int s[2];
72 if (adb_socketpair(s)) {
73 PLOG(ERROR) << "cannot create service socket pair.";
74 return unique_fd{};
75 }
76 VLOG(SERVICES) << "service socketpair: " << s[0] << ", " << s[1];
77 if (!handle_forward_request(str.c_str(), transport, s[1])) {
78 SendFail(s[1], "not a reverse forwarding command");
79 }
80 adb_close(s[1]);
81 return unique_fd{s[0]};
82 }
83
84 // Shell service string can look like:
85 // shell[,arg1,arg2,...]:[command]
ShellService(std::string_view args,const atransport * transport)86 unique_fd ShellService(std::string_view args, const atransport* transport) {
87 size_t delimiter_index = args.find(':');
88 if (delimiter_index == std::string::npos) {
89 LOG(ERROR) << "No ':' found in shell service arguments: " << args;
90 return unique_fd{};
91 }
92
93 // TODO: android::base::Split(const std::string_view&, ...)
94 std::string service_args(args.substr(0, delimiter_index));
95 std::string command(args.substr(delimiter_index + 1));
96
97 // Defaults:
98 // PTY for interactive, raw for non-interactive.
99 // No protocol.
100 // $TERM set to "dumb".
101 SubprocessType type(command.empty() ? SubprocessType::kPty : SubprocessType::kRaw);
102 SubprocessProtocol protocol = SubprocessProtocol::kNone;
103 std::string terminal_type = "dumb";
104
105 for (const std::string& arg : android::base::Split(service_args, ",")) {
106 if (arg == kShellServiceArgRaw) {
107 type = SubprocessType::kRaw;
108 } else if (arg == kShellServiceArgPty) {
109 type = SubprocessType::kPty;
110 } else if (arg == kShellServiceArgShellProtocol) {
111 protocol = SubprocessProtocol::kShell;
112 } else if (arg.starts_with("TERM=")) {
113 terminal_type = arg.substr(strlen("TERM="));
114 } else if (!arg.empty()) {
115 // This is not an error to allow for future expansion.
116 LOG(WARNING) << "Ignoring unknown shell service argument: " << arg;
117 }
118 }
119
120 return StartSubprocess(command, terminal_type.c_str(), type, protocol);
121 }
122
spin_service(unique_fd fd)123 static void spin_service(unique_fd fd) {
124 if (!__android_log_is_debuggable()) {
125 WriteFdExactly(fd.get(), "refusing to spin on non-debuggable build\n");
126 return;
127 }
128
129 // A service that creates an fdevent that's always pending, and then ignores it.
130 unique_fd pipe_read, pipe_write;
131 if (!Pipe(&pipe_read, &pipe_write)) {
132 WriteFdExactly(fd.get(), "failed to create pipe\n");
133 return;
134 }
135
136 fdevent_run_on_main_thread([fd = pipe_read.release()]() {
137 fdevent* fde = fdevent_create(
138 fd, [](int, unsigned, void*) {}, nullptr);
139 fdevent_add(fde, FDE_READ);
140 });
141
142 WriteFdExactly(fd.get(), "spinning\n");
143 }
144
145 struct ServiceSocket : public asocket {
ServiceSocketServiceSocket146 ServiceSocket() {
147 install_local_socket(this);
148 this->enqueue = [](asocket* self, apacket::payload_type data) {
149 return static_cast<ServiceSocket*>(self)->Enqueue(std::move(data));
150 };
151 this->ready = [](asocket* self) { return static_cast<ServiceSocket*>(self)->Ready(); };
152 this->close = [](asocket* self) { return static_cast<ServiceSocket*>(self)->Close(); };
153 }
154 virtual ~ServiceSocket() = default;
155
EnqueueServiceSocket156 virtual int Enqueue(apacket::payload_type data) { return -1; }
ReadyServiceSocket157 virtual void Ready() {}
CloseServiceSocket158 virtual void Close() {
159 if (peer) {
160 peer->peer = nullptr;
161 if (peer->shutdown) {
162 peer->shutdown(peer);
163 }
164 peer->close(peer);
165 }
166
167 remove_socket(this);
168 delete this;
169 }
170 };
171
172 struct SinkSocket : public ServiceSocket {
SinkSocketSinkSocket173 explicit SinkSocket(size_t byte_count) {
174 LOG(INFO) << "Creating new SinkSocket with capacity " << byte_count;
175 bytes_left_ = byte_count;
176 }
177
~SinkSocketSinkSocket178 virtual ~SinkSocket() { LOG(INFO) << "SinkSocket destroyed"; }
179
EnqueueSinkSocket180 virtual int Enqueue(apacket::payload_type data) override final {
181 if (bytes_left_ <= data.size()) {
182 // Done reading.
183 Close();
184 return -1;
185 }
186
187 bytes_left_ -= data.size();
188 return 0;
189 }
190
191 size_t bytes_left_;
192 };
193
194 struct SourceSocket : public ServiceSocket {
SourceSocketSourceSocket195 explicit SourceSocket(size_t byte_count) {
196 LOG(INFO) << "Creating new SourceSocket with capacity " << byte_count;
197 bytes_left_ = byte_count;
198 }
199
~SourceSocketSourceSocket200 virtual ~SourceSocket() { LOG(INFO) << "SourceSocket destroyed"; }
201
ReadySourceSocket202 void Ready() {
203 size_t len = std::min(bytes_left_, get_max_payload());
204 if (len == 0) {
205 Close();
206 return;
207 }
208
209 Block block(len);
210 memset(block.data(), 0, block.size());
211 peer->enqueue(peer, std::move(block));
212 bytes_left_ -= len;
213 }
214
EnqueueSourceSocket215 int Enqueue(apacket::payload_type data) { return -1; }
216
217 size_t bytes_left_;
218 };
219
daemon_service_to_socket(std::string_view name)220 asocket* daemon_service_to_socket(std::string_view name) {
221 if (name == "jdwp") {
222 return create_jdwp_service_socket();
223 } else if (name == "track-jdwp") {
224 return create_jdwp_tracker_service_socket();
225 } else if (android::base::ConsumePrefix(&name, "sink:")) {
226 uint64_t byte_count = 0;
227 if (!ParseUint(&byte_count, name)) {
228 return nullptr;
229 }
230 return new SinkSocket(byte_count);
231 } else if (android::base::ConsumePrefix(&name, "source:")) {
232 uint64_t byte_count = 0;
233 if (!ParseUint(&byte_count, name)) {
234 return nullptr;
235 }
236 return new SourceSocket(byte_count);
237 }
238
239 return nullptr;
240 }
241
daemon_service_to_fd(std::string_view name,atransport * transport)242 unique_fd daemon_service_to_fd(std::string_view name, atransport* transport) {
243 #if defined(__ANDROID__) && !defined(__ANDROID_RECOVERY__)
244 if (name.starts_with("abb:") || name.starts_with("abb_exec:")) {
245 return execute_abb_command(name);
246 }
247 #endif
248
249 #if defined(__ANDROID__)
250 if (name.starts_with("framebuffer:")) {
251 return create_service_thread("fb", framebuffer_service);
252 } else if (android::base::ConsumePrefix(&name, "remount:")) {
253 std::string cmd = "/system/bin/remount ";
254 cmd += name;
255 return StartSubprocess(cmd, nullptr, SubprocessType::kRaw, SubprocessProtocol::kNone);
256 } else if (android::base::ConsumePrefix(&name, "reboot:")) {
257 std::string arg(name);
258 return create_service_thread("reboot",
259 std::bind(reboot_service, std::placeholders::_1, arg));
260 } else if (name.starts_with("root:")) {
261 return create_service_thread("root", restart_root_service);
262 } else if (name.starts_with("unroot:")) {
263 return create_service_thread("unroot", restart_unroot_service);
264 } else if (android::base::ConsumePrefix(&name, "backup:")) {
265 std::string cmd = "/system/bin/bu backup ";
266 cmd += name;
267 return StartSubprocess(cmd, nullptr, SubprocessType::kRaw, SubprocessProtocol::kNone);
268 } else if (name.starts_with("restore:")) {
269 return StartSubprocess("/system/bin/bu restore", nullptr, SubprocessType::kRaw,
270 SubprocessProtocol::kNone);
271 } else if (name.starts_with("disable-verity:")) {
272 return create_service_thread("verity-on", std::bind(set_verity_enabled_state_service,
273 std::placeholders::_1, false));
274 } else if (name.starts_with("enable-verity:")) {
275 return create_service_thread("verity-off", std::bind(set_verity_enabled_state_service,
276 std::placeholders::_1, true));
277 } else if (android::base::ConsumePrefix(&name, "tcpip:")) {
278 std::string str(name);
279
280 int port;
281 if (sscanf(str.c_str(), "%d", &port) != 1) {
282 return unique_fd{};
283 }
284 return create_service_thread("tcp",
285 std::bind(restart_tcp_service, std::placeholders::_1, port));
286 } else if (name.starts_with("usb:")) {
287 return create_service_thread("usb", restart_usb_service);
288 }
289 #endif
290
291 if (android::base::ConsumePrefix(&name, "dev:")) {
292 return unique_fd{unix_open(name, O_RDWR | O_CLOEXEC)};
293 } else if (android::base::ConsumePrefix(&name, "jdwp:")) {
294 pid_t pid;
295 if (!ParseUint(&pid, name)) {
296 return unique_fd{};
297 }
298 return create_jdwp_connection_fd(pid);
299 } else if (android::base::ConsumePrefix(&name, "shell")) {
300 return ShellService(name, transport);
301 } else if (android::base::ConsumePrefix(&name, "exec:")) {
302 return StartSubprocess(std::string(name), nullptr, SubprocessType::kRaw,
303 SubprocessProtocol::kNone);
304 } else if (name.starts_with("sync:")) {
305 return create_service_thread("sync", file_sync_service);
306 } else if (android::base::ConsumePrefix(&name, "reverse:")) {
307 return reverse_service(name, transport);
308 } else if (name == "reconnect") {
309 return create_service_thread(
310 "reconnect", std::bind(reconnect_service, std::placeholders::_1, transport));
311 } else if (name == "spin") {
312 return create_service_thread("spin", spin_service);
313 }
314
315 return unique_fd{};
316 }
317