services.c revision 893a4a47e8c9290128b9254af0246e36f821c260 
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    }
148cleanup:
149    free(arg);
150    adb_close(fd);
151}
152
153#endif
154
155static int create_service_thread(void (*func)(int, void *), void *cookie)
156{
157    stinfo *sti;
158    adb_thread_t t;
159    int s[2];
160
161    if(adb_socketpair(s)) {
162        printf("cannot create service socket pair\n");
163        return -1;
164    }
165
166    sti = malloc(sizeof(stinfo));
167    if(sti == 0) fatal("cannot allocate stinfo");
168    sti->func = func;
169    sti->cookie = cookie;
170    sti->fd = s[1];
171
172    if(adb_thread_create( &t, service_bootstrap_func, sti)){
173        free(sti);
174        adb_close(s[0]);
175        adb_close(s[1]);
176        printf("cannot create service thread\n");
177        return -1;
178    }
179
180    D("service thread started, %d:%d\n",s[0], s[1]);
181    return s[0];
182}
183
184#if !ADB_HOST
185static int create_subprocess(const char *cmd, const char *arg0, const char *arg1, pid_t *pid)
186{
187#ifdef HAVE_WIN32_PROC
188    D("create_subprocess(cmd=%s, arg0=%s, arg1=%s)\n", cmd, arg0, arg1);
189    fprintf(stderr, "error: create_subprocess not implemented on Win32 (%s %s %s)\n", cmd, arg0, arg1);
190    return -1;
191#else /* !HAVE_WIN32_PROC */
192    char *devname;
193    int ptm;
194
195    ptm = unix_open("/dev/ptmx", O_RDWR); // | O_NOCTTY);
196    if(ptm < 0){
197        printf("[ cannot open /dev/ptmx - %s ]\n",strerror(errno));
198        return -1;
199    }
200    fcntl(ptm, F_SETFD, FD_CLOEXEC);
201
202    if(grantpt(ptm) || unlockpt(ptm) ||
203       ((devname = (char*) ptsname(ptm)) == 0)){
204        printf("[ trouble with /dev/ptmx - %s ]\n", strerror(errno));
205        adb_close(ptm);
206        return -1;
207    }
208
209    *pid = fork();
210    if(*pid < 0) {
211        printf("- fork failed: %s -\n", strerror(errno));
212        adb_close(ptm);
213        return -1;
214    }
215
216    if(*pid == 0){
217        int pts;
218
219        setsid();
220
221        pts = unix_open(devname, O_RDWR);
222        if(pts < 0) {
223            fprintf(stderr, "child failed to open pseudo-term slave: %s\n", devname);
224            exit(-1);
225        }
226
227        dup2(pts, 0);
228        dup2(pts, 1);
229        dup2(pts, 2);
230
231        adb_close(pts);
232        adb_close(ptm);
233
234        // set OOM adjustment to zero
235        char text[64];
236        snprintf(text, sizeof text, "/proc/%d/oom_adj", getpid());
237        int fd = adb_open(text, O_WRONLY);
238        if (fd >= 0) {
239            adb_write(fd, "0", 1);
240            adb_close(fd);
241        } else {
242           D("adb: unable to open %s\n", text);
243        }
244        execl(cmd, cmd, arg0, arg1, NULL);
245        fprintf(stderr, "- exec '%s' failed: %s (%d) -\n",
246                cmd, strerror(errno), errno);
247        exit(-1);
248    } else {
249        // Don't set child's OOM adjustment to zero.
250        // Let the child do it itself, as sometimes the parent starts
251        // running before the child has a /proc/pid/oom_adj.
252        // """adb: unable to open /proc/644/oom_adj""" seen in some logs.
253        return ptm;
254    }
255#endif /* !HAVE_WIN32_PROC */
256}
257#endif  /* !ABD_HOST */
258
259#if ADB_HOST
260#define SHELL_COMMAND "/bin/sh"
261#else
262#define SHELL_COMMAND "/system/bin/sh"
263#endif
264
265#if !ADB_HOST
266static void subproc_waiter_service(int fd, void *cookie)
267{
268    pid_t pid = (pid_t)cookie;
269
270    D("entered. fd=%d of pid=%d\n", fd, pid);
271    for (;;) {
272        int status;
273        pid_t p = waitpid(pid, &status, 0);
274        if (p == pid) {
275            D("fd=%d, post waitpid(pid=%d) status=%04x\n", fd, p, status);
276            if (WIFSIGNALED(status)) {
277                D("*** Killed by signal %d\n", WTERMSIG(status));
278                break;
279            } else if (!WIFEXITED(status)) {
280                D("*** Didn't exit!!. status %d\n", status);
281                break;
282            } else if (WEXITSTATUS(status) >= 0) {
283                D("*** Exit code %d\n", WEXITSTATUS(status));
284                break;
285            }
286         }
287    }
288    D("shell exited fd=%d of pid=%d err=%d\n", fd, pid, errno);
289    if (SHELL_EXIT_NOTIFY_FD >=0) {
290      int res;
291      res = writex(SHELL_EXIT_NOTIFY_FD, &fd, sizeof(fd));
292      D("notified shell exit via fd=%d for pid=%d res=%d errno=%d\n",
293        SHELL_EXIT_NOTIFY_FD, pid, res, errno);
294    }
295}
296
297static int create_subproc_thread(const char *name)
298{
299    stinfo *sti;
300    adb_thread_t t;
301    int ret_fd;
302    pid_t pid;
303    if(name) {
304        ret_fd = create_subprocess(SHELL_COMMAND, "-c", name, &pid);
305    } else {
306        ret_fd = create_subprocess(SHELL_COMMAND, "-", 0, &pid);
307    }
308    D("create_subprocess() ret_fd=%d pid=%d\n", ret_fd, pid);
309
310    sti = malloc(sizeof(stinfo));
311    if(sti == 0) fatal("cannot allocate stinfo");
312    sti->func = subproc_waiter_service;
313    sti->cookie = (void*)pid;
314    sti->fd = ret_fd;
315
316    if(adb_thread_create( &t, service_bootstrap_func, sti)){
317        free(sti);
318        adb_close(ret_fd);
319        printf("cannot create service thread\n");
320        return -1;
321    }
322
323    D("service thread started, fd=%d pid=%d\n",ret_fd, pid);
324    return ret_fd;
325}
326#endif
327
328int service_to_fd(const char *name)
329{
330    int ret = -1;
331
332    if(!strncmp(name, "tcp:", 4)) {
333        int port = atoi(name + 4);
334        name = strchr(name + 4, ':');
335        if(name == 0) {
336            ret = socket_loopback_client(port, SOCK_STREAM);
337            if (ret >= 0)
338                disable_tcp_nagle(ret);
339        } else {
340#if ADB_HOST
341            ret = socket_network_client(name + 1, port, SOCK_STREAM);
342#else
343            return -1;
344#endif
345        }
346#ifndef HAVE_WINSOCK   /* winsock doesn't implement unix domain sockets */
347    } else if(!strncmp(name, "local:", 6)) {
348        ret = socket_local_client(name + 6,
349                ANDROID_SOCKET_NAMESPACE_RESERVED, SOCK_STREAM);
350    } else if(!strncmp(name, "localreserved:", 14)) {
351        ret = socket_local_client(name + 14,
352                ANDROID_SOCKET_NAMESPACE_RESERVED, SOCK_STREAM);
353    } else if(!strncmp(name, "localabstract:", 14)) {
354        ret = socket_local_client(name + 14,
355                ANDROID_SOCKET_NAMESPACE_ABSTRACT, SOCK_STREAM);
356    } else if(!strncmp(name, "localfilesystem:", 16)) {
357        ret = socket_local_client(name + 16,
358                ANDROID_SOCKET_NAMESPACE_FILESYSTEM, SOCK_STREAM);
359#endif
360#if !ADB_HOST
361    } else if(!strncmp("dev:", name, 4)) {
362        ret = unix_open(name + 4, O_RDWR);
363    } else if(!strncmp(name, "framebuffer:", 12)) {
364        ret = create_service_thread(framebuffer_service, 0);
365    } else if (!strncmp(name, "jdwp:", 5)) {
366        ret = create_jdwp_connection_fd(atoi(name+5));
367    } else if (!strncmp(name, "log:", 4)) {
368        ret = create_service_thread(log_service, get_log_file_path(name + 4));
369    } else if(!HOST && !strncmp(name, "shell:", 6)) {
370        if(name[6]) {
371            ret = create_subproc_thread(name + 6);
372        } else {
373            ret = create_subproc_thread(0);
374        }
375    } else if(!strncmp(name, "sync:", 5)) {
376        ret = create_service_thread(file_sync_service, NULL);
377    } else if(!strncmp(name, "remount:", 8)) {
378        ret = create_service_thread(remount_service, NULL);
379    } else if(!strncmp(name, "reboot:", 7)) {
380        void* arg = strdup(name + 7);
381        if(arg == 0) return -1;
382        ret = create_service_thread(reboot_service, arg);
383    } else if(!strncmp(name, "root:", 5)) {
384        ret = create_service_thread(restart_root_service, NULL);
385    } else if(!strncmp(name, "backup:", 7)) {
386        char* arg = strdup(name+7);
387        if (arg == NULL) return -1;
388        ret = backup_service(BACKUP, arg);
389    } else if(!strncmp(name, "restore:", 8)) {
390        ret = backup_service(RESTORE, NULL);
391    } else if(!strncmp(name, "tcpip:", 6)) {
392        int port;
393        if (sscanf(name + 6, "%d", &port) == 0) {
394            port = 0;
395        }
396        ret = create_service_thread(restart_tcp_service, (void *)port);
397    } else if(!strncmp(name, "usb:", 4)) {
398        ret = create_service_thread(restart_usb_service, NULL);
399#endif
400    }
401    if (ret >= 0) {
402        close_on_exec(ret);
403    }
404    return ret;
405}
406
407#if ADB_HOST
408struct state_info {
409    transport_type transport;
410    char* serial;
411    int state;
412};
413
414static void wait_for_state(int fd, void* cookie)
415{
416    struct state_info* sinfo = cookie;
417    char* err = "unknown error";
418
419    D("wait_for_state %d\n", sinfo->state);
420
421    atransport *t = acquire_one_transport(sinfo->state, sinfo->transport, sinfo->serial, &err);
422    if(t != 0) {
423        writex(fd, "OKAY", 4);
424    } else {
425        sendfailmsg(fd, err);
426    }
427
428    if (sinfo->serial)
429        free(sinfo->serial);
430    free(sinfo);
431    adb_close(fd);
432    D("wait_for_state is done\n");
433}
434
435static void connect_device(char* host, char* buffer, int buffer_size)
436{
437    int port, fd;
438    char* portstr = strchr(host, ':');
439    char hostbuf[100];
440    char serial[100];
441    int ret;
442
443    strncpy(hostbuf, host, sizeof(hostbuf) - 1);
444    if (portstr) {
445        if (portstr - host >= (ptrdiff_t)sizeof(hostbuf)) {
446            snprintf(buffer, buffer_size, "bad host name %s", host);
447            return;
448        }
449        // zero terminate the host at the point we found the colon
450        hostbuf[portstr - host] = 0;
451        if (sscanf(portstr + 1, "%d", &port) == 0) {
452            snprintf(buffer, buffer_size, "bad port number %s", portstr);
453            return;
454        }
455    } else {
456        port = DEFAULT_ADB_LOCAL_TRANSPORT_PORT;
457    }
458
459    snprintf(serial, sizeof(serial), "%s:%d", hostbuf, port);
460
461    fd = socket_network_client(hostbuf, port, SOCK_STREAM);
462    if (fd < 0) {
463        snprintf(buffer, buffer_size, "unable to connect to %s:%d", host, port);
464        return;
465    }
466
467    D("client: connected on remote on fd %d\n", fd);
468    close_on_exec(fd);
469    disable_tcp_nagle(fd);
470
471    ret = register_socket_transport(fd, serial, port, 0);
472    if (ret < 0) {
473        adb_close(fd);
474        snprintf(buffer, buffer_size, "already connected to %s", serial);
475    } else {
476        snprintf(buffer, buffer_size, "connected to %s", serial);
477    }
478}
479
480void connect_emulator(char* port_spec, char* buffer, int buffer_size)
481{
482    char* port_separator = strchr(port_spec, ',');
483    if (!port_separator) {
484        snprintf(buffer, buffer_size,
485                "unable to parse '%s' as <console port>,<adb port>",
486                port_spec);
487        return;
488    }
489
490    // Zero-terminate console port and make port_separator point to 2nd port.
491    *port_separator++ = 0;
492    int console_port = strtol(port_spec, NULL, 0);
493    int adb_port = strtol(port_separator, NULL, 0);
494    if (!(console_port > 0 && adb_port > 0)) {
495        *(port_separator - 1) = ',';
496        snprintf(buffer, buffer_size,
497                "Invalid port numbers: Expected positive numbers, got '%s'",
498                port_spec);
499        return;
500    }
501
502    /* Check if the emulator is already known.
503     * Note: There's a small but harmless race condition here: An emulator not
504     * present just yet could be registered by another invocation right
505     * after doing this check here. However, local_connect protects
506     * against double-registration too. From here, a better error message
507     * can be produced. In the case of the race condition, the very specific
508     * error message won't be shown, but the data doesn't get corrupted. */
509    atransport* known_emulator = find_emulator_transport_by_adb_port(adb_port);
510    if (known_emulator != NULL) {
511        snprintf(buffer, buffer_size,
512                "Emulator on port %d already registered.", adb_port);
513        return;
514    }
515
516    /* Check if more emulators can be registered. Similar unproblematic
517     * race condition as above. */
518    int candidate_slot = get_available_local_transport_index();
519    if (candidate_slot < 0) {
520        snprintf(buffer, buffer_size, "Cannot accept more emulators.");
521        return;
522    }
523
524    /* Preconditions met, try to connect to the emulator. */
525    if (!local_connect_arbitrary_ports(console_port, adb_port)) {
526        snprintf(buffer, buffer_size,
527                "Connected to emulator on ports %d,%d", console_port, adb_port);
528    } else {
529        snprintf(buffer, buffer_size,
530                "Could not connect to emulator on ports %d,%d",
531                console_port, adb_port);
532    }
533}
534
535static void connect_service(int fd, void* cookie)
536{
537    char buf[4096];
538    char resp[4096];
539    char *host = cookie;
540
541    if (!strncmp(host, "emu:", 4)) {
542        connect_emulator(host + 4, buf, sizeof(buf));
543    } else {
544        connect_device(host, buf, sizeof(buf));
545    }
546
547    // Send response for emulator and device
548    snprintf(resp, sizeof(resp), "%04x%s",(unsigned)strlen(buf), buf);
549    writex(fd, resp, strlen(resp));
550    adb_close(fd);
551}
552#endif
553
554#if ADB_HOST
555asocket*  host_service_to_socket(const char*  name, const char *serial)
556{
557    if (!strcmp(name,"track-devices")) {
558        return create_device_tracker();
559    } else if (!strncmp(name, "wait-for-", strlen("wait-for-"))) {
560        struct state_info* sinfo = malloc(sizeof(struct state_info));
561
562        if (serial)
563            sinfo->serial = strdup(serial);
564        else
565            sinfo->serial = NULL;
566
567        name += strlen("wait-for-");
568
569        if (!strncmp(name, "local", strlen("local"))) {
570            sinfo->transport = kTransportLocal;
571            sinfo->state = CS_DEVICE;
572        } else if (!strncmp(name, "usb", strlen("usb"))) {
573            sinfo->transport = kTransportUsb;
574            sinfo->state = CS_DEVICE;
575        } else if (!strncmp(name, "any", strlen("any"))) {
576            sinfo->transport = kTransportAny;
577            sinfo->state = CS_DEVICE;
578        } else {
579            free(sinfo);
580            return NULL;
581        }
582
583        int fd = create_service_thread(wait_for_state, sinfo);
584        return create_local_socket(fd);
585    } else if (!strncmp(name, "connect:", 8)) {
586        const char *host = name + 8;
587        int fd = create_service_thread(connect_service, (void *)host);
588        return create_local_socket(fd);
589    }
590    return NULL;
591}
592#endif /* ADB_HOST */
593