1 /*
2 * Copyright (C) 2007 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 <stddef.h>
23 #include <stdio.h>
24 #include <stdlib.h>
25 #include <string.h>
26
27 #include <thread>
28
29 #include <android-base/stringprintf.h>
30 #include <android-base/strings.h>
31 #include <cutils/sockets.h>
32
33 #include "adb.h"
34 #include "adb_io.h"
35 #include "adb_unique_fd.h"
36 #include "adb_utils.h"
37 #include "services.h"
38 #include "socket_spec.h"
39 #include "sysdeps.h"
40 #include "transport.h"
41
42 namespace {
43
service_bootstrap_func(std::string service_name,std::function<void (unique_fd)> func,unique_fd fd)44 void service_bootstrap_func(std::string service_name, std::function<void(unique_fd)> func,
45 unique_fd fd) {
46 adb_thread_setname(android::base::StringPrintf("%s svc %d", service_name.c_str(), fd.get()));
47 func(std::move(fd));
48 }
49
50 } // namespace
51
create_service_thread(const char * service_name,std::function<void (unique_fd)> func)52 unique_fd create_service_thread(const char* service_name, std::function<void(unique_fd)> func) {
53 int s[2];
54 if (adb_socketpair(s)) {
55 printf("cannot create service socket pair\n");
56 return unique_fd();
57 }
58 D("socketpair: (%d,%d)", s[0], s[1]);
59
60 #if !ADB_HOST
61 if (strcmp(service_name, "sync") == 0) {
62 // Set file sync service socket to maximum size
63 int max_buf = LINUX_MAX_SOCKET_SIZE;
64 adb_setsockopt(s[0], SOL_SOCKET, SO_SNDBUF, &max_buf, sizeof(max_buf));
65 adb_setsockopt(s[1], SOL_SOCKET, SO_SNDBUF, &max_buf, sizeof(max_buf));
66 }
67 #endif // !ADB_HOST
68
69 std::thread(service_bootstrap_func, service_name, func, unique_fd(s[1])).detach();
70
71 D("service thread started, %d:%d", s[0], s[1]);
72 return unique_fd(s[0]);
73 }
74
service_to_fd(std::string_view name,atransport * transport)75 unique_fd service_to_fd(std::string_view name, atransport* transport) {
76 unique_fd ret;
77
78 if (is_socket_spec(name)) {
79 std::string error;
80 if (!socket_spec_connect(&ret, name, nullptr, nullptr, &error)) {
81 LOG(ERROR) << "failed to connect to socket '" << name << "': " << error;
82 }
83 } else {
84 #if !ADB_HOST
85 ret = daemon_service_to_fd(name, transport);
86 #endif
87 }
88
89 if (ret >= 0) {
90 close_on_exec(ret.get());
91 }
92 return ret;
93 }
94
95 #if ADB_HOST
96 struct state_info {
97 TransportType transport_type;
98 std::string serial;
99 TransportId transport_id;
100 ConnectionState state;
101 };
102
wait_for_state(int fd,state_info * sinfo)103 static void wait_for_state(int fd, state_info* sinfo) {
104 D("wait_for_state %d", sinfo->state);
105
106 while (true) {
107 bool is_ambiguous = false;
108 std::string error = "unknown error";
109 const char* serial = sinfo->serial.length() ? sinfo->serial.c_str() : nullptr;
110 atransport* t = acquire_one_transport(sinfo->transport_type, serial, sinfo->transport_id,
111 &is_ambiguous, &error);
112 if (sinfo->state == kCsOffline) {
113 // wait-for-disconnect uses kCsOffline, we don't actually want to wait for 'offline'.
114 if (t == nullptr) {
115 SendOkay(fd);
116 break;
117 }
118 } else if (t != nullptr &&
119 (sinfo->state == kCsAny || sinfo->state == t->GetConnectionState())) {
120 SendOkay(fd);
121 break;
122 }
123
124 if (!is_ambiguous) {
125 adb_pollfd pfd = {.fd = fd, .events = POLLIN};
126 int rc = adb_poll(&pfd, 1, 100);
127 if (rc < 0) {
128 SendFail(fd, error);
129 break;
130 } else if (rc > 0 && (pfd.revents & POLLHUP) != 0) {
131 // The other end of the socket is closed, probably because the other side was
132 // terminated, bail out.
133 break;
134 }
135
136 // Try again...
137 } else {
138 SendFail(fd, error);
139 break;
140 }
141 }
142
143 adb_close(fd);
144 D("wait_for_state is done");
145 }
146
connect_emulator(const std::string & port_spec,std::string * response)147 void connect_emulator(const std::string& port_spec, std::string* response) {
148 std::vector<std::string> pieces = android::base::Split(port_spec, ",");
149 if (pieces.size() != 2) {
150 *response = android::base::StringPrintf("unable to parse '%s' as <console port>,<adb port>",
151 port_spec.c_str());
152 return;
153 }
154
155 int console_port = strtol(pieces[0].c_str(), nullptr, 0);
156 int adb_port = strtol(pieces[1].c_str(), nullptr, 0);
157 if (console_port <= 0 || adb_port <= 0) {
158 *response = android::base::StringPrintf("Invalid port numbers: %s", port_spec.c_str());
159 return;
160 }
161
162 // Check if the emulator is already known.
163 // Note: There's a small but harmless race condition here: An emulator not
164 // present just yet could be registered by another invocation right
165 // after doing this check here. However, local_connect protects
166 // against double-registration too. From here, a better error message
167 // can be produced. In the case of the race condition, the very specific
168 // error message won't be shown, but the data doesn't get corrupted.
169 atransport* known_emulator = find_emulator_transport_by_adb_port(adb_port);
170 if (known_emulator != nullptr) {
171 *response = android::base::StringPrintf("Emulator already registered on port %d", adb_port);
172 return;
173 }
174
175 // Preconditions met, try to connect to the emulator.
176 std::string error;
177 if (!local_connect_arbitrary_ports(console_port, adb_port, &error)) {
178 *response = android::base::StringPrintf("Connected to emulator on ports %d,%d",
179 console_port, adb_port);
180 } else {
181 *response = android::base::StringPrintf("Could not connect to emulator on ports %d,%d: %s",
182 console_port, adb_port, error.c_str());
183 }
184 }
185
connect_service(unique_fd fd,std::string host)186 static void connect_service(unique_fd fd, std::string host) {
187 std::string response;
188 if (!strncmp(host.c_str(), "emu:", 4)) {
189 connect_emulator(host.c_str() + 4, &response);
190 } else {
191 connect_device(host, &response);
192 }
193
194 // Send response for emulator and device
195 SendProtocolString(fd.get(), response);
196 }
197 #endif
198
199 #if ADB_HOST
host_service_to_socket(std::string_view name,std::string_view serial,TransportId transport_id)200 asocket* host_service_to_socket(std::string_view name, std::string_view serial,
201 TransportId transport_id) {
202 if (name == "track-devices") {
203 return create_device_tracker(false);
204 } else if (name == "track-devices-l") {
205 return create_device_tracker(true);
206 } else if (ConsumePrefix(&name, "wait-for-")) {
207 std::shared_ptr<state_info> sinfo = std::make_shared<state_info>();
208 if (sinfo == nullptr) {
209 fprintf(stderr, "couldn't allocate state_info: %s", strerror(errno));
210 return nullptr;
211 }
212
213 sinfo->serial = serial;
214 sinfo->transport_id = transport_id;
215
216 if (ConsumePrefix(&name, "local")) {
217 sinfo->transport_type = kTransportLocal;
218 } else if (ConsumePrefix(&name, "usb")) {
219 sinfo->transport_type = kTransportUsb;
220 } else if (ConsumePrefix(&name, "any")) {
221 sinfo->transport_type = kTransportAny;
222 } else {
223 return nullptr;
224 }
225
226 if (name == "-device") {
227 sinfo->state = kCsDevice;
228 } else if (name == "-recovery") {
229 sinfo->state = kCsRecovery;
230 } else if (name == "-rescue") {
231 sinfo->state = kCsRescue;
232 } else if (name == "-sideload") {
233 sinfo->state = kCsSideload;
234 } else if (name == "-bootloader") {
235 sinfo->state = kCsBootloader;
236 } else if (name == "-any") {
237 sinfo->state = kCsAny;
238 } else if (name == "-disconnect") {
239 sinfo->state = kCsOffline;
240 } else {
241 return nullptr;
242 }
243
244 unique_fd fd = create_service_thread("wait", [sinfo](int fd) {
245 wait_for_state(fd, sinfo.get());
246 });
247 return create_local_socket(std::move(fd));
248 } else if (ConsumePrefix(&name, "connect:")) {
249 std::string host(name);
250 unique_fd fd = create_service_thread(
251 "connect", std::bind(connect_service, std::placeholders::_1, host));
252 return create_local_socket(std::move(fd));
253 }
254 return nullptr;
255 }
256 #endif /* ADB_HOST */
257