services.c revision c66a7537df987715acc77eed952111cc56b7e72b 
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#include <stddef.h>
18#include <stdlib.h>
19#include <stdio.h>
20#include <unistd.h>
21#include <string.h>
22#include <errno.h>
23
24#include "sysdeps.h"
25
26#define  TRACE_TAG  TRACE_SERVICES
27#include "adb.h"
28#include "file_sync_service.h"
29
30#if ADB_HOST
31#  ifndef HAVE_WINSOCK
32#    include <netinet/in.h>
33#    include <netdb.h>
34#    include <sys/ioctl.h>
35#  endif
36#else
37#  include <cutils/android_reboot.h>
38#  include <cutils/properties.h>
39#endif
40
41typedef struct stinfo stinfo;
42
43struct stinfo {
44    void (*func)(int fd, void *cookie);
45    int fd;
46    void *cookie;
47};
48
49
50void *service_bootstrap_func(void *x)
51{
52    stinfo *sti = x;
53    sti->func(sti->fd, sti->cookie);
54    free(sti);
55    return 0;
56}
57
58#if !ADB_HOST
59
60void restart_root_service(int fd, void *cookie)
61{
62    char buf[100];
63    char value[PROPERTY_VALUE_MAX];
64
65    if (getuid() == 0) {
66        snprintf(buf, sizeof(buf), "adbd is already running as root\n");
67        writex(fd, buf, strlen(buf));
68        adb_close(fd);
69    } else {
70        property_get("ro.debuggable", value, "");
71        if (strcmp(value, "1") != 0) {
72            snprintf(buf, sizeof(buf), "adbd cannot run as root in production builds\n");
73            writex(fd, buf, strlen(buf));
74            adb_close(fd);
75            return;
76        }
77
78        property_set("service.adb.root", "1");
79        snprintf(buf, sizeof(buf), "restarting adbd as root\n");
80        writex(fd, buf, strlen(buf));
81        adb_close(fd);
82    }
83}
84
85void restart_tcp_service(int fd, void *cookie)
86{
87    char buf[100];
88    char value[PROPERTY_VALUE_MAX];
89    int port = (int)cookie;
90
91    if (port <= 0) {
92        snprintf(buf, sizeof(buf), "invalid port\n");
93        writex(fd, buf, strlen(buf));
94        adb_close(fd);
95        return;
96    }
97
98    snprintf(value, sizeof(value), "%d", port);
99    property_set("service.adb.tcp.port", value);
100    snprintf(buf, sizeof(buf), "restarting in TCP mode port: %d\n", port);
101    writex(fd, buf, strlen(buf));
102    adb_close(fd);
103}
104
105void restart_usb_service(int fd, void *cookie)
106{
107    char buf[100];
108
109    property_set("service.adb.tcp.port", "0");
110    snprintf(buf, sizeof(buf), "restarting in USB mode\n");
111    writex(fd, buf, strlen(buf));
112    adb_close(fd);
113}
114
115void reboot_service(int fd, void *arg)
116{
117    char buf[100];
118    char property_val[PROPERTY_VALUE_MAX];
119    int pid, ret;
120
121    sync();
122
123    /* Attempt to unmount the SD card first.
124     * No need to bother checking for errors.
125     */
126    pid = fork();
127    if (pid == 0) {
128        /* ask vdc to unmount it */
129        execl("/system/bin/vdc", "/system/bin/vdc", "volume", "unmount",
130                getenv("EXTERNAL_STORAGE"), "force", NULL);
131    } else if (pid > 0) {
132        /* wait until vdc succeeds or fails */
133        waitpid(pid, &ret, 0);
134    }
135
136    ret = snprintf(property_val, sizeof(property_val), "reboot,%s", (char *) arg);
137    if (ret >= (int) sizeof(property_val)) {
138        snprintf(buf, sizeof(buf), "reboot string too long. length=%d\n", ret);
139        writex(fd, buf, strlen(buf));
140        goto cleanup;
141    }
142
143    ret = property_set(ANDROID_RB_PROPERTY, property_val);
144    if (ret < 0) {
145        snprintf(buf, sizeof(buf), "reboot failed: %d\n", ret);
146        writex(fd, buf, strlen(buf));
147        goto cleanup;
148    }
149    // Don't return early. Give the reboot command time to take effect
150    // to avoid messing up scripts which do "adb reboot && adb wait-for-device"
151    while(1) { pause(); }
152cleanup:
153    free(arg);
154    adb_close(fd);
155}
156
157#endif
158
159static int create_service_thread(void (*func)(int, void *), void *cookie)
160{
161    stinfo *sti;
162    adb_thread_t t;
163    int s[2];
164
165    if(adb_socketpair(s)) {
166        printf("cannot create service socket pair\n");
167        return -1;
168    }
169
170    sti = malloc(sizeof(stinfo));
171    if(sti == 0) fatal("cannot allocate stinfo");
172    sti->func = func;
173    sti->cookie = cookie;
174    sti->fd = s[1];
175
176    if(adb_thread_create( &t, service_bootstrap_func, sti)){
177        free(sti);
178        adb_close(s[0]);
179        adb_close(s[1]);
180        printf("cannot create service thread\n");
181        return -1;
182    }
183
184    D("service thread started, %d:%d\n",s[0], s[1]);
185    return s[0];
186}
187
188#if !ADB_HOST
189static int create_subprocess(const char *cmd, const char *arg0, const char *arg1, pid_t *pid)
190{
191#ifdef HAVE_WIN32_PROC
192    D("create_subprocess(cmd=%s, arg0=%s, arg1=%s)\n", cmd, arg0, arg1);
193    fprintf(stderr, "error: create_subprocess not implemented on Win32 (%s %s %s)\n", cmd, arg0, arg1);
194    return -1;
195#else /* !HAVE_WIN32_PROC */
196    char *devname;
197    int ptm;
198
199    ptm = unix_open("/dev/ptmx", O_RDWR); // | O_NOCTTY);
200    if(ptm < 0){
201        printf("[ cannot open /dev/ptmx - %s ]\n",strerror(errno));
202        return -1;
203    }
204    fcntl(ptm, F_SETFD, FD_CLOEXEC);
205
206    if(grantpt(ptm) || unlockpt(ptm) ||
207       ((devname = (char*) ptsname(ptm)) == 0)){
208        printf("[ trouble with /dev/ptmx - %s ]\n", strerror(errno));
209        adb_close(ptm);
210        return -1;
211    }
212
213    *pid = fork();
214    if(*pid < 0) {
215        printf("- fork failed: %s -\n", strerror(errno));
216        adb_close(ptm);
217        return -1;
218    }
219
220    if(*pid == 0){
221        int pts;
222
223        setsid();
224
225        pts = unix_open(devname, O_RDWR);
226        if(pts < 0) {
227            fprintf(stderr, "child failed to open pseudo-term slave: %s\n", devname);
228            exit(-1);
229        }
230
231        dup2(pts, 0);
232        dup2(pts, 1);
233        dup2(pts, 2);
234
235        adb_close(pts);
236        adb_close(ptm);
237
238        // set OOM adjustment to zero
239        char text[64];
240        snprintf(text, sizeof text, "/proc/%d/oom_adj", getpid());
241        int fd = adb_open(text, O_WRONLY);
242        if (fd >= 0) {
243            adb_write(fd, "0", 1);
244            adb_close(fd);
245        } else {
246           D("adb: unable to open %s\n", text);
247        }
248        execl(cmd, cmd, arg0, arg1, NULL);
249        fprintf(stderr, "- exec '%s' failed: %s (%d) -\n",
250                cmd, strerror(errno), errno);
251        exit(-1);
252    } else {
253        // Don't set child's OOM adjustment to zero.
254        // Let the child do it itself, as sometimes the parent starts
255        // running before the child has a /proc/pid/oom_adj.
256        // """adb: unable to open /proc/644/oom_adj""" seen in some logs.
257        return ptm;
258    }
259#endif /* !HAVE_WIN32_PROC */
260}
261#endif  /* !ABD_HOST */
262
263#if ADB_HOST
264#define SHELL_COMMAND "/bin/sh"
265#else
266#define SHELL_COMMAND "/system/bin/sh"
267#endif
268
269#if !ADB_HOST
270static void subproc_waiter_service(int fd, void *cookie)
271{
272    pid_t pid = (pid_t)cookie;
273
274    D("entered. fd=%d of pid=%d\n", fd, pid);
275    for (;;) {
276        int status;
277        pid_t p = waitpid(pid, &status, 0);
278        if (p == pid) {
279            D("fd=%d, post waitpid(pid=%d) status=%04x\n", fd, p, status);
280            if (WIFSIGNALED(status)) {
281                D("*** Killed by signal %d\n", WTERMSIG(status));
282                break;
283            } else if (!WIFEXITED(status)) {
284                D("*** Didn't exit!!. status %d\n", status);
285                break;
286            } else if (WEXITSTATUS(status) >= 0) {
287                D("*** Exit code %d\n", WEXITSTATUS(status));
288                break;
289            }
290         }
291    }
292    D("shell exited fd=%d of pid=%d err=%d\n", fd, pid, errno);
293    if (SHELL_EXIT_NOTIFY_FD >=0) {
294      int res;
295      res = writex(SHELL_EXIT_NOTIFY_FD, &fd, sizeof(fd));
296      D("notified shell exit via fd=%d for pid=%d res=%d errno=%d\n",
297        SHELL_EXIT_NOTIFY_FD, pid, res, errno);
298    }
299}
300
301static int create_subproc_thread(const char *name)
302{
303    stinfo *sti;
304    adb_thread_t t;
305    int ret_fd;
306    pid_t pid;
307    if(name) {
308        ret_fd = create_subprocess(SHELL_COMMAND, "-c", name, &pid);
309    } else {
310        ret_fd = create_subprocess(SHELL_COMMAND, "-", 0, &pid);
311    }
312    D("create_subprocess() ret_fd=%d pid=%d\n", ret_fd, pid);
313
314    sti = malloc(sizeof(stinfo));
315    if(sti == 0) fatal("cannot allocate stinfo");
316    sti->func = subproc_waiter_service;
317    sti->cookie = (void*)pid;
318    sti->fd = ret_fd;
319
320    if(adb_thread_create( &t, service_bootstrap_func, sti)){
321        free(sti);
322        adb_close(ret_fd);
323        printf("cannot create service thread\n");
324        return -1;
325    }
326
327    D("service thread started, fd=%d pid=%d\n",ret_fd, pid);
328    return ret_fd;
329}
330#endif
331
332int service_to_fd(const char *name)
333{
334    int ret = -1;
335
336    if(!strncmp(name, "tcp:", 4)) {
337        int port = atoi(name + 4);
338        name = strchr(name + 4, ':');
339        if(name == 0) {
340            ret = socket_loopback_client(port, SOCK_STREAM);
341            if (ret >= 0)
342                disable_tcp_nagle(ret);
343        } else {
344#if ADB_HOST
345            ret = socket_network_client(name + 1, port, SOCK_STREAM);
346#else
347            return -1;
348#endif
349        }
350#ifndef HAVE_WINSOCK   /* winsock doesn't implement unix domain sockets */
351    } else if(!strncmp(name, "local:", 6)) {
352        ret = socket_local_client(name + 6,
353                ANDROID_SOCKET_NAMESPACE_RESERVED, SOCK_STREAM);
354    } else if(!strncmp(name, "localreserved:", 14)) {
355        ret = socket_local_client(name + 14,
356                ANDROID_SOCKET_NAMESPACE_RESERVED, SOCK_STREAM);
357    } else if(!strncmp(name, "localabstract:", 14)) {
358        ret = socket_local_client(name + 14,
359                ANDROID_SOCKET_NAMESPACE_ABSTRACT, SOCK_STREAM);
360    } else if(!strncmp(name, "localfilesystem:", 16)) {
361        ret = socket_local_client(name + 16,
362                ANDROID_SOCKET_NAMESPACE_FILESYSTEM, SOCK_STREAM);
363#endif
364#if !ADB_HOST
365    } else if(!strncmp("dev:", name, 4)) {
366        ret = unix_open(name + 4, O_RDWR);
367    } else if(!strncmp(name, "framebuffer:", 12)) {
368        ret = create_service_thread(framebuffer_service, 0);
369    } else if (!strncmp(name, "jdwp:", 5)) {
370        ret = create_jdwp_connection_fd(atoi(name+5));
371    } else if(!HOST && !strncmp(name, "shell:", 6)) {
372        if(name[6]) {
373            ret = create_subproc_thread(name + 6);
374        } else {
375            ret = create_subproc_thread(0);
376        }
377    } else if(!strncmp(name, "sync:", 5)) {
378        ret = create_service_thread(file_sync_service, NULL);
379    } else if(!strncmp(name, "remount:", 8)) {
380        ret = create_service_thread(remount_service, NULL);
381    } else if(!strncmp(name, "reboot:", 7)) {
382        void* arg = strdup(name + 7);
383        if(arg == 0) return -1;
384        ret = create_service_thread(reboot_service, arg);
385    } else if(!strncmp(name, "root:", 5)) {
386        ret = create_service_thread(restart_root_service, NULL);
387    } else if(!strncmp(name, "backup:", 7)) {
388        char* arg = strdup(name+7);
389        if (arg == NULL) return -1;
390        ret = backup_service(BACKUP, arg);
391    } else if(!strncmp(name, "restore:", 8)) {
392        ret = backup_service(RESTORE, NULL);
393    } else if(!strncmp(name, "tcpip:", 6)) {
394        int port;
395        if (sscanf(name + 6, "%d", &port) == 0) {
396            port = 0;
397        }
398        ret = create_service_thread(restart_tcp_service, (void *)port);
399    } else if(!strncmp(name, "usb:", 4)) {
400        ret = create_service_thread(restart_usb_service, NULL);
401#endif
402    }
403    if (ret >= 0) {
404        close_on_exec(ret);
405    }
406    return ret;
407}
408
409#if ADB_HOST
410struct state_info {
411    transport_type transport;
412    char* serial;
413    int state;
414};
415
416static void wait_for_state(int fd, void* cookie)
417{
418    struct state_info* sinfo = cookie;
419    char* err = "unknown error";
420
421    D("wait_for_state %d\n", sinfo->state);
422
423    atransport *t = acquire_one_transport(sinfo->state, sinfo->transport, sinfo->serial, &err);
424    if(t != 0) {
425        writex(fd, "OKAY", 4);
426    } else {
427        sendfailmsg(fd, err);
428    }
429
430    if (sinfo->serial)
431        free(sinfo->serial);
432    free(sinfo);
433    adb_close(fd);
434    D("wait_for_state is done\n");
435}
436
437static void connect_device(char* host, char* buffer, int buffer_size)
438{
439    int port, fd;
440    char* portstr = strchr(host, ':');
441    char hostbuf[100];
442    char serial[100];
443    int ret;
444
445    strncpy(hostbuf, host, sizeof(hostbuf) - 1);
446    if (portstr) {
447        if (portstr - host >= (ptrdiff_t)sizeof(hostbuf)) {
448            snprintf(buffer, buffer_size, "bad host name %s", host);
449            return;
450        }
451        // zero terminate the host at the point we found the colon
452        hostbuf[portstr - host] = 0;
453        if (sscanf(portstr + 1, "%d", &port) == 0) {
454            snprintf(buffer, buffer_size, "bad port number %s", portstr);
455            return;
456        }
457    } else {
458        port = DEFAULT_ADB_LOCAL_TRANSPORT_PORT;
459    }
460
461    snprintf(serial, sizeof(serial), "%s:%d", hostbuf, port);
462
463    fd = socket_network_client(hostbuf, port, SOCK_STREAM);
464    if (fd < 0) {
465        snprintf(buffer, buffer_size, "unable to connect to %s:%d", host, port);
466        return;
467    }
468
469    D("client: connected on remote on fd %d\n", fd);
470    close_on_exec(fd);
471    disable_tcp_nagle(fd);
472
473    ret = register_socket_transport(fd, serial, port, 0);
474    if (ret < 0) {
475        adb_close(fd);
476        snprintf(buffer, buffer_size, "already connected to %s", serial);
477    } else {
478        snprintf(buffer, buffer_size, "connected to %s", serial);
479    }
480}
481
482void connect_emulator(char* port_spec, char* buffer, int buffer_size)
483{
484    char* port_separator = strchr(port_spec, ',');
485    if (!port_separator) {
486        snprintf(buffer, buffer_size,
487                "unable to parse '%s' as <console port>,<adb port>",
488                port_spec);
489        return;
490    }
491
492    // Zero-terminate console port and make port_separator point to 2nd port.
493    *port_separator++ = 0;
494    int console_port = strtol(port_spec, NULL, 0);
495    int adb_port = strtol(port_separator, NULL, 0);
496    if (!(console_port > 0 && adb_port > 0)) {
497        *(port_separator - 1) = ',';
498        snprintf(buffer, buffer_size,
499                "Invalid port numbers: Expected positive numbers, got '%s'",
500                port_spec);
501        return;
502    }
503
504    /* Check if the emulator is already known.
505     * Note: There's a small but harmless race condition here: An emulator not
506     * present just yet could be registered by another invocation right
507     * after doing this check here. However, local_connect protects
508     * against double-registration too. From here, a better error message
509     * can be produced. In the case of the race condition, the very specific
510     * error message won't be shown, but the data doesn't get corrupted. */
511    atransport* known_emulator = find_emulator_transport_by_adb_port(adb_port);
512    if (known_emulator != NULL) {
513        snprintf(buffer, buffer_size,
514                "Emulator on port %d already registered.", adb_port);
515        return;
516    }
517
518    /* Check if more emulators can be registered. Similar unproblematic
519     * race condition as above. */
520    int candidate_slot = get_available_local_transport_index();
521    if (candidate_slot < 0) {
522        snprintf(buffer, buffer_size, "Cannot accept more emulators.");
523        return;
524    }
525
526    /* Preconditions met, try to connect to the emulator. */
527    if (!local_connect_arbitrary_ports(console_port, adb_port)) {
528        snprintf(buffer, buffer_size,
529                "Connected to emulator on ports %d,%d", console_port, adb_port);
530    } else {
531        snprintf(buffer, buffer_size,
532                "Could not connect to emulator on ports %d,%d",
533                console_port, adb_port);
534    }
535}
536
537static void connect_service(int fd, void* cookie)
538{
539    char buf[4096];
540    char resp[4096];
541    char *host = cookie;
542
543    if (!strncmp(host, "emu:", 4)) {
544        connect_emulator(host + 4, buf, sizeof(buf));
545    } else {
546        connect_device(host, buf, sizeof(buf));
547    }
548
549    // Send response for emulator and device
550    snprintf(resp, sizeof(resp), "%04x%s",(unsigned)strlen(buf), buf);
551    writex(fd, resp, strlen(resp));
552    adb_close(fd);
553}
554#endif
555
556#if ADB_HOST
557asocket*  host_service_to_socket(const char*  name, const char *serial)
558{
559    if (!strcmp(name,"track-devices")) {
560        return create_device_tracker();
561    } else if (!strncmp(name, "wait-for-", strlen("wait-for-"))) {
562        struct state_info* sinfo = malloc(sizeof(struct state_info));
563
564        if (serial)
565            sinfo->serial = strdup(serial);
566        else
567            sinfo->serial = NULL;
568
569        name += strlen("wait-for-");
570
571        if (!strncmp(name, "local", strlen("local"))) {
572            sinfo->transport = kTransportLocal;
573            sinfo->state = CS_DEVICE;
574        } else if (!strncmp(name, "usb", strlen("usb"))) {
575            sinfo->transport = kTransportUsb;
576            sinfo->state = CS_DEVICE;
577        } else if (!strncmp(name, "any", strlen("any"))) {
578            sinfo->transport = kTransportAny;
579            sinfo->state = CS_DEVICE;
580        } else {
581            free(sinfo);
582            return NULL;
583        }
584
585        int fd = create_service_thread(wait_for_state, sinfo);
586        return create_local_socket(fd);
587    } else if (!strncmp(name, "connect:", 8)) {
588        const char *host = name + 8;
589        int fd = create_service_thread(connect_service, (void *)host);
590        return create_local_socket(fd);
591    }
592    return NULL;
593}
594#endif /* ADB_HOST */
595