services.cpp revision 18ddf5c6a233bd56d20548fd834c0ecbf8216410 
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#ifndef _WIN32
28#include <netdb.h>
29#include <netinet/in.h>
30#include <sys/ioctl.h>
31#include <unistd.h>
32#endif
33
34#include <base/file.h>
35#include <base/stringprintf.h>
36#include <base/strings.h>
37#include <cutils/sockets.h>
38
39#if !ADB_HOST
40#include "cutils/android_reboot.h"
41#include "cutils/properties.h"
42#endif
43
44#include "adb.h"
45#include "adb_io.h"
46#include "adb_utils.h"
47#include "file_sync_service.h"
48#include "remount_service.h"
49#include "services.h"
50#include "shell_service.h"
51#include "transport.h"
52
53struct stinfo {
54    void (*func)(int fd, void *cookie);
55    int fd;
56    void *cookie;
57};
58
59void *service_bootstrap_func(void *x)
60{
61    stinfo* sti = reinterpret_cast<stinfo*>(x);
62    adb_thread_setname(android::base::StringPrintf("service %d", sti->fd));
63    sti->func(sti->fd, sti->cookie);
64    free(sti);
65    return 0;
66}
67
68#if !ADB_HOST
69
70void restart_root_service(int fd, void *cookie) {
71    if (getuid() == 0) {
72        WriteFdExactly(fd, "adbd is already running as root\n");
73        adb_close(fd);
74    } else {
75        char value[PROPERTY_VALUE_MAX];
76        property_get("ro.debuggable", value, "");
77        if (strcmp(value, "1") != 0) {
78            WriteFdExactly(fd, "adbd cannot run as root in production builds\n");
79            adb_close(fd);
80            return;
81        }
82
83        property_set("service.adb.root", "1");
84        WriteFdExactly(fd, "restarting adbd as root\n");
85        adb_close(fd);
86    }
87}
88
89void restart_unroot_service(int fd, void *cookie) {
90    if (getuid() != 0) {
91        WriteFdExactly(fd, "adbd not running as root\n");
92        adb_close(fd);
93    } else {
94        property_set("service.adb.root", "0");
95        WriteFdExactly(fd, "restarting adbd as non root\n");
96        adb_close(fd);
97    }
98}
99
100void restart_tcp_service(int fd, void *cookie) {
101    int port = (int) (uintptr_t) cookie;
102    if (port <= 0) {
103        WriteFdFmt(fd, "invalid port %d\n", port);
104        adb_close(fd);
105        return;
106    }
107
108    char value[PROPERTY_VALUE_MAX];
109    snprintf(value, sizeof(value), "%d", port);
110    property_set("service.adb.tcp.port", value);
111    WriteFdFmt(fd, "restarting in TCP mode port: %d\n", port);
112    adb_close(fd);
113}
114
115void restart_usb_service(int fd, void *cookie) {
116    property_set("service.adb.tcp.port", "0");
117    WriteFdExactly(fd, "restarting in USB mode\n");
118    adb_close(fd);
119}
120
121static bool reboot_service_impl(int fd, const char* arg) {
122    const char* reboot_arg = arg;
123    bool auto_reboot = false;
124
125    if (strcmp(reboot_arg, "sideload-auto-reboot") == 0) {
126        auto_reboot = true;
127        reboot_arg = "sideload";
128    }
129
130    // It reboots into sideload mode by setting "--sideload" or "--sideload_auto_reboot"
131    // in the command file.
132    if (strcmp(reboot_arg, "sideload") == 0) {
133        if (getuid() != 0) {
134            WriteFdExactly(fd, "'adb root' is required for 'adb reboot sideload'.\n");
135            return false;
136        }
137
138        const char* const recovery_dir = "/cache/recovery";
139        const char* const command_file = "/cache/recovery/command";
140        // Ensure /cache/recovery exists.
141        if (adb_mkdir(recovery_dir, 0770) == -1 && errno != EEXIST) {
142            D("Failed to create directory '%s': %s", recovery_dir, strerror(errno));
143            return false;
144        }
145
146        bool write_status = android::base::WriteStringToFile(
147                auto_reboot ? "--sideload_auto_reboot" : "--sideload", command_file);
148        if (!write_status) {
149            return false;
150        }
151
152        reboot_arg = "recovery";
153    }
154
155    sync();
156
157    char property_val[PROPERTY_VALUE_MAX];
158    int ret = snprintf(property_val, sizeof(property_val), "reboot,%s", reboot_arg);
159    if (ret >= static_cast<int>(sizeof(property_val))) {
160        WriteFdFmt(fd, "reboot string too long: %d\n", ret);
161        return false;
162    }
163
164    ret = property_set(ANDROID_RB_PROPERTY, property_val);
165    if (ret < 0) {
166        WriteFdFmt(fd, "reboot failed: %d\n", ret);
167        return false;
168    }
169
170    return true;
171}
172
173void reboot_service(int fd, void* arg)
174{
175    if (reboot_service_impl(fd, static_cast<const char*>(arg))) {
176        // Don't return early. Give the reboot command time to take effect
177        // to avoid messing up scripts which do "adb reboot && adb wait-for-device"
178        while (true) {
179            pause();
180        }
181    }
182
183    free(arg);
184    adb_close(fd);
185}
186
187int reverse_service(const char* command) {
188    int s[2];
189    if (adb_socketpair(s)) {
190        PLOG(ERROR) << "cannot create service socket pair.";
191        return -1;
192    }
193    VLOG(SERVICES) << "service socketpair: " << s[0] << ", " << s[1];
194    if (handle_forward_request(command, kTransportAny, nullptr, s[1]) < 0) {
195        SendFail(s[1], "not a reverse forwarding command");
196    }
197    adb_close(s[1]);
198    return s[0];
199}
200
201// Shell service string can look like:
202//   shell[,arg1,arg2,...]:[command]
203static int ShellService(const std::string& args, const atransport* transport) {
204    size_t delimiter_index = args.find(':');
205    if (delimiter_index == std::string::npos) {
206        LOG(ERROR) << "No ':' found in shell service arguments: " << args;
207        return -1;
208    }
209
210    const std::string service_args = args.substr(0, delimiter_index);
211    const std::string command = args.substr(delimiter_index + 1);
212
213    // Defaults:
214    //   PTY for interactive, raw for non-interactive.
215    //   No protocol.
216    //   $TERM set to "dumb".
217    SubprocessType type(command.empty() ? SubprocessType::kPty
218                                        : SubprocessType::kRaw);
219    SubprocessProtocol protocol = SubprocessProtocol::kNone;
220    std::string terminal_type = "dumb";
221
222    for (const std::string& arg : android::base::Split(service_args, ",")) {
223        if (arg == kShellServiceArgRaw) {
224            type = SubprocessType::kRaw;
225        } else if (arg == kShellServiceArgPty) {
226            type = SubprocessType::kPty;
227        } else if (arg == kShellServiceArgShellProtocol) {
228            protocol = SubprocessProtocol::kShell;
229        } else if (android::base::StartsWith(arg, "TERM=")) {
230            terminal_type = arg.substr(5);
231        } else if (!arg.empty()) {
232            // This is not an error to allow for future expansion.
233            LOG(WARNING) << "Ignoring unknown shell service argument: " << arg;
234        }
235    }
236
237    return StartSubprocess(command.c_str(), terminal_type.c_str(), type, protocol);
238}
239
240#endif  // !ADB_HOST
241
242static int create_service_thread(void (*func)(int, void *), void *cookie)
243{
244    int s[2];
245    if (adb_socketpair(s)) {
246        printf("cannot create service socket pair\n");
247        return -1;
248    }
249    D("socketpair: (%d,%d)", s[0], s[1]);
250
251    stinfo* sti = reinterpret_cast<stinfo*>(malloc(sizeof(stinfo)));
252    if (sti == nullptr) {
253        fatal("cannot allocate stinfo");
254    }
255    sti->func = func;
256    sti->cookie = cookie;
257    sti->fd = s[1];
258
259    if (!adb_thread_create(service_bootstrap_func, sti)) {
260        free(sti);
261        adb_close(s[0]);
262        adb_close(s[1]);
263        printf("cannot create service thread\n");
264        return -1;
265    }
266
267    D("service thread started, %d:%d",s[0], s[1]);
268    return s[0];
269}
270
271int service_to_fd(const char* name, const atransport* transport) {
272    int ret = -1;
273
274    if(!strncmp(name, "tcp:", 4)) {
275        int port = atoi(name + 4);
276        name = strchr(name + 4, ':');
277        if(name == 0) {
278            std::string error;
279            ret = network_loopback_client(port, SOCK_STREAM, &error);
280            if (ret >= 0)
281                disable_tcp_nagle(ret);
282        } else {
283#if ADB_HOST
284            std::string error;
285            ret = network_connect(name + 1, port, SOCK_STREAM, 0, &error);
286#else
287            return -1;
288#endif
289        }
290#if !defined(_WIN32)   /* winsock doesn't implement unix domain sockets */
291    } else if(!strncmp(name, "local:", 6)) {
292        ret = socket_local_client(name + 6,
293                ANDROID_SOCKET_NAMESPACE_RESERVED, SOCK_STREAM);
294    } else if(!strncmp(name, "localreserved:", 14)) {
295        ret = socket_local_client(name + 14,
296                ANDROID_SOCKET_NAMESPACE_RESERVED, SOCK_STREAM);
297    } else if(!strncmp(name, "localabstract:", 14)) {
298        ret = socket_local_client(name + 14,
299                ANDROID_SOCKET_NAMESPACE_ABSTRACT, SOCK_STREAM);
300    } else if(!strncmp(name, "localfilesystem:", 16)) {
301        ret = socket_local_client(name + 16,
302                ANDROID_SOCKET_NAMESPACE_FILESYSTEM, SOCK_STREAM);
303#endif
304#if !ADB_HOST
305    } else if(!strncmp("dev:", name, 4)) {
306        ret = unix_open(name + 4, O_RDWR | O_CLOEXEC);
307    } else if(!strncmp(name, "framebuffer:", 12)) {
308        ret = create_service_thread(framebuffer_service, 0);
309    } else if (!strncmp(name, "jdwp:", 5)) {
310        ret = create_jdwp_connection_fd(atoi(name+5));
311    } else if(!strncmp(name, "shell", 5)) {
312        ret = ShellService(name + 5, transport);
313    } else if(!strncmp(name, "exec:", 5)) {
314        ret = StartSubprocess(name + 5, nullptr, SubprocessType::kRaw, SubprocessProtocol::kNone);
315    } else if(!strncmp(name, "sync:", 5)) {
316        ret = create_service_thread(file_sync_service, NULL);
317    } else if(!strncmp(name, "remount:", 8)) {
318        ret = create_service_thread(remount_service, NULL);
319    } else if(!strncmp(name, "reboot:", 7)) {
320        void* arg = strdup(name + 7);
321        if (arg == NULL) return -1;
322        ret = create_service_thread(reboot_service, arg);
323    } else if(!strncmp(name, "root:", 5)) {
324        ret = create_service_thread(restart_root_service, NULL);
325    } else if(!strncmp(name, "unroot:", 7)) {
326        ret = create_service_thread(restart_unroot_service, NULL);
327    } else if(!strncmp(name, "backup:", 7)) {
328        ret = StartSubprocess(android::base::StringPrintf("/system/bin/bu backup %s",
329                                                          (name + 7)).c_str(),
330                              nullptr, SubprocessType::kRaw, SubprocessProtocol::kNone);
331    } else if(!strncmp(name, "restore:", 8)) {
332        ret = StartSubprocess("/system/bin/bu restore", nullptr, SubprocessType::kRaw,
333                              SubprocessProtocol::kNone);
334    } else if(!strncmp(name, "tcpip:", 6)) {
335        int port;
336        if (sscanf(name + 6, "%d", &port) != 1) {
337            return -1;
338        }
339        ret = create_service_thread(restart_tcp_service, (void *) (uintptr_t) port);
340    } else if(!strncmp(name, "usb:", 4)) {
341        ret = create_service_thread(restart_usb_service, NULL);
342    } else if (!strncmp(name, "reverse:", 8)) {
343        ret = reverse_service(name + 8);
344    } else if(!strncmp(name, "disable-verity:", 15)) {
345        ret = create_service_thread(set_verity_enabled_state_service, (void*)0);
346    } else if(!strncmp(name, "enable-verity:", 15)) {
347        ret = create_service_thread(set_verity_enabled_state_service, (void*)1);
348#endif
349    }
350    if (ret >= 0) {
351        close_on_exec(ret);
352    }
353    return ret;
354}
355
356#if ADB_HOST
357struct state_info {
358    TransportType transport_type;
359    char* serial;
360    ConnectionState state;
361};
362
363static void wait_for_state(int fd, void* cookie) {
364    state_info* sinfo = reinterpret_cast<state_info*>(cookie);
365
366    D("wait_for_state %d", sinfo->state);
367
368    while (true) {
369        bool is_ambiguous = false;
370        std::string error = "unknown error";
371        atransport* t = acquire_one_transport(sinfo->transport_type, sinfo->serial,
372                                              &is_ambiguous, &error);
373        if (t != nullptr && t->connection_state == sinfo->state) {
374            SendOkay(fd);
375            break;
376        } else if (!is_ambiguous) {
377            adb_sleep_ms(1000);
378            // Try again...
379        } else {
380            SendFail(fd, error);
381            break;
382        }
383    }
384
385    if (sinfo->serial) {
386        free(sinfo->serial);
387    }
388    free(sinfo);
389    adb_close(fd);
390    D("wait_for_state is done");
391}
392
393static void connect_device(const std::string& address, std::string* response) {
394    if (address.empty()) {
395        *response = "empty address";
396        return;
397    }
398
399    std::string serial;
400    std::string host;
401    int port = DEFAULT_ADB_LOCAL_TRANSPORT_PORT;
402    if (!parse_host_and_port(address, &serial, &host, &port, response)) {
403        return;
404    }
405
406    std::string error;
407    int fd = network_connect(host.c_str(), port, SOCK_STREAM, 10, &error);
408    if (fd == -1) {
409        *response = android::base::StringPrintf("unable to connect to %s: %s",
410                                                serial.c_str(), error.c_str());
411        return;
412    }
413
414    D("client: connected %s remote on fd %d", serial.c_str(), fd);
415    close_on_exec(fd);
416    disable_tcp_nagle(fd);
417
418    int ret = register_socket_transport(fd, serial.c_str(), port, 0);
419    if (ret < 0) {
420        adb_close(fd);
421        *response = android::base::StringPrintf("already connected to %s", serial.c_str());
422    } else {
423        *response = android::base::StringPrintf("connected to %s", serial.c_str());
424    }
425}
426
427void connect_emulator(const std::string& port_spec, std::string* response) {
428    std::vector<std::string> pieces = android::base::Split(port_spec, ",");
429    if (pieces.size() != 2) {
430        *response = android::base::StringPrintf("unable to parse '%s' as <console port>,<adb port>",
431                                                port_spec.c_str());
432        return;
433    }
434
435    int console_port = strtol(pieces[0].c_str(), NULL, 0);
436    int adb_port = strtol(pieces[1].c_str(), NULL, 0);
437    if (console_port <= 0 || adb_port <= 0) {
438        *response = android::base::StringPrintf("Invalid port numbers: %s", port_spec.c_str());
439        return;
440    }
441
442    // Check if the emulator is already known.
443    // Note: There's a small but harmless race condition here: An emulator not
444    // present just yet could be registered by another invocation right
445    // after doing this check here. However, local_connect protects
446    // against double-registration too. From here, a better error message
447    // can be produced. In the case of the race condition, the very specific
448    // error message won't be shown, but the data doesn't get corrupted.
449    atransport* known_emulator = find_emulator_transport_by_adb_port(adb_port);
450    if (known_emulator != nullptr) {
451        *response = android::base::StringPrintf("Emulator already registered on port %d", adb_port);
452        return;
453    }
454
455    // Check if more emulators can be registered. Similar unproblematic
456    // race condition as above.
457    int candidate_slot = get_available_local_transport_index();
458    if (candidate_slot < 0) {
459        *response = "Cannot accept more emulators";
460        return;
461    }
462
463    // Preconditions met, try to connect to the emulator.
464    std::string error;
465    if (!local_connect_arbitrary_ports(console_port, adb_port, &error)) {
466        *response = android::base::StringPrintf("Connected to emulator on ports %d,%d",
467                                                console_port, adb_port);
468    } else {
469        *response = android::base::StringPrintf("Could not connect to emulator on ports %d,%d: %s",
470                                                console_port, adb_port, error.c_str());
471    }
472}
473
474static void connect_service(int fd, void* data) {
475    char* host = reinterpret_cast<char*>(data);
476    std::string response;
477    if (!strncmp(host, "emu:", 4)) {
478        connect_emulator(host + 4, &response);
479    } else {
480        connect_device(host, &response);
481    }
482    free(host);
483
484    // Send response for emulator and device
485    SendProtocolString(fd, response);
486    adb_close(fd);
487}
488#endif
489
490#if ADB_HOST
491asocket* host_service_to_socket(const char* name, const char* serial) {
492    if (!strcmp(name,"track-devices")) {
493        return create_device_tracker();
494    } else if (!strncmp(name, "wait-for-", strlen("wait-for-"))) {
495        auto sinfo = reinterpret_cast<state_info*>(malloc(sizeof(state_info)));
496        if (sinfo == nullptr) {
497            fprintf(stderr, "couldn't allocate state_info: %s", strerror(errno));
498            return NULL;
499        }
500
501        if (serial)
502            sinfo->serial = strdup(serial);
503        else
504            sinfo->serial = NULL;
505
506        name += strlen("wait-for-");
507
508        if (!strncmp(name, "local", strlen("local"))) {
509            sinfo->transport_type = kTransportLocal;
510            sinfo->state = kCsDevice;
511        } else if (!strncmp(name, "usb", strlen("usb"))) {
512            sinfo->transport_type = kTransportUsb;
513            sinfo->state = kCsDevice;
514        } else if (!strncmp(name, "any", strlen("any"))) {
515            sinfo->transport_type = kTransportAny;
516            sinfo->state = kCsDevice;
517        } else {
518            if (sinfo->serial) {
519                free(sinfo->serial);
520            }
521            free(sinfo);
522            return NULL;
523        }
524
525        int fd = create_service_thread(wait_for_state, sinfo);
526        return create_local_socket(fd);
527    } else if (!strncmp(name, "connect:", 8)) {
528        char* host = strdup(name + 8);
529        int fd = create_service_thread(connect_service, host);
530        return create_local_socket(fd);
531    }
532    return NULL;
533}
534#endif /* ADB_HOST */
535