services.c revision 535164e9d9649a83d4d63829f3389f2bea339fe1 
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 <stdlib.h>
18#include <stdio.h>
19#include <unistd.h>
20#include <string.h>
21#include <errno.h>
22
23#include "sysdeps.h"
24
25#define  TRACE_TAG  TRACE_SERVICES
26#include "adb.h"
27#include "file_sync_service.h"
28
29#if ADB_HOST
30#  ifndef HAVE_WINSOCK
31#    include <netinet/in.h>
32#    include <netdb.h>
33#    include <sys/ioctl.h>
34#  endif
35#else
36#  include <cutils/android_reboot.h>
37#endif
38
39typedef struct stinfo stinfo;
40
41struct stinfo {
42    void (*func)(int fd, void *cookie);
43    int fd;
44    void *cookie;
45};
46
47
48void *service_bootstrap_func(void *x)
49{
50    stinfo *sti = x;
51    sti->func(sti->fd, sti->cookie);
52    free(sti);
53    return 0;
54}
55
56#if ADB_HOST
57ADB_MUTEX_DEFINE( dns_lock );
58
59static void dns_service(int fd, void *cookie)
60{
61    char *hostname = cookie;
62    struct hostent *hp;
63    unsigned zero = 0;
64
65    adb_mutex_lock(&dns_lock);
66    hp = gethostbyname(hostname);
67    free(cookie);
68    if(hp == 0) {
69        writex(fd, &zero, 4);
70    } else {
71        writex(fd, hp->h_addr, 4);
72    }
73    adb_mutex_unlock(&dns_lock);
74    adb_close(fd);
75}
76#else
77extern int recovery_mode;
78
79static void recover_service(int s, void *cookie)
80{
81    unsigned char buf[4096];
82    unsigned count = (unsigned) cookie;
83    int fd;
84
85    fd = adb_creat("/tmp/update", 0644);
86    if(fd < 0) {
87        adb_close(s);
88        return;
89    }
90
91    while(count > 0) {
92        unsigned xfer = (count > 4096) ? 4096 : count;
93        if(readx(s, buf, xfer)) break;
94        if(writex(fd, buf, xfer)) break;
95        count -= xfer;
96    }
97
98    if(count == 0) {
99        writex(s, "OKAY", 4);
100    } else {
101        writex(s, "FAIL", 4);
102    }
103    adb_close(fd);
104    adb_close(s);
105
106    fd = adb_creat("/tmp/update.begin", 0644);
107    adb_close(fd);
108}
109
110void restart_root_service(int fd, void *cookie)
111{
112    char buf[100];
113    char value[PROPERTY_VALUE_MAX];
114
115    if (getuid() == 0) {
116        snprintf(buf, sizeof(buf), "adbd is already running as root\n");
117        writex(fd, buf, strlen(buf));
118        adb_close(fd);
119    } else {
120        property_get("ro.debuggable", value, "");
121        if (strcmp(value, "1") != 0) {
122            snprintf(buf, sizeof(buf), "adbd cannot run as root in production builds\n");
123            writex(fd, buf, strlen(buf));
124            adb_close(fd);
125            return;
126        }
127
128        snprintf(buf, sizeof(buf), "restarting adbd as root\n");
129        writex(fd, buf, strlen(buf));
130        adb_close(fd);
131
132        // This will cause a property trigger in init.rc to restart us
133        property_set("service.adb.root", "1");
134    }
135}
136
137void restart_tcp_service(int fd, void *cookie)
138{
139    char buf[100];
140    char value[PROPERTY_VALUE_MAX];
141    int port = (int)cookie;
142
143    if (port <= 0) {
144        snprintf(buf, sizeof(buf), "invalid port\n");
145        writex(fd, buf, strlen(buf));
146        adb_close(fd);
147        return;
148    }
149
150    snprintf(value, sizeof(value), "%d", port);
151    property_set("service.adb.tcp.port", value);
152    snprintf(buf, sizeof(buf), "restarting in TCP mode port: %d\n", port);
153    writex(fd, buf, strlen(buf));
154    adb_close(fd);
155
156    // quit, and init will restart us in TCP mode
157    sleep(1);
158    exit(1);
159}
160
161void restart_usb_service(int fd, void *cookie)
162{
163    char buf[100];
164
165    property_set("service.adb.tcp.port", "0");
166    snprintf(buf, sizeof(buf), "restarting in USB mode\n");
167    writex(fd, buf, strlen(buf));
168    adb_close(fd);
169
170    // quit, and init will restart us in USB mode
171    sleep(1);
172    exit(1);
173}
174
175void reboot_service(int fd, void *arg)
176{
177    char buf[100];
178    int pid, ret;
179
180    sync();
181
182    /* Attempt to unmount the SD card first.
183     * No need to bother checking for errors.
184     */
185    pid = fork();
186    if (pid == 0) {
187        /* ask vdc to unmount it */
188        execl("/system/bin/vdc", "/system/bin/vdc", "volume", "unmount",
189                getenv("EXTERNAL_STORAGE"), "force", NULL);
190    } else if (pid > 0) {
191        /* wait until vdc succeeds or fails */
192        waitpid(pid, &ret, 0);
193    }
194
195    ret = android_reboot(ANDROID_RB_RESTART2, 0, (char *) arg);
196    if (ret < 0) {
197        snprintf(buf, sizeof(buf), "reboot failed: %s\n", strerror(errno));
198        writex(fd, buf, strlen(buf));
199    }
200    free(arg);
201    adb_close(fd);
202}
203
204#endif
205
206#if 0
207static void echo_service(int fd, void *cookie)
208{
209    char buf[4096];
210    int r;
211    char *p;
212    int c;
213
214    for(;;) {
215        r = read(fd, buf, 4096);
216        if(r == 0) goto done;
217        if(r < 0) {
218            if(errno == EINTR) continue;
219            else goto done;
220        }
221
222        c = r;
223        p = buf;
224        while(c > 0) {
225            r = write(fd, p, c);
226            if(r > 0) {
227                c -= r;
228                p += r;
229                continue;
230            }
231            if((r < 0) && (errno == EINTR)) continue;
232            goto done;
233        }
234    }
235done:
236    close(fd);
237}
238#endif
239
240static int create_service_thread(void (*func)(int, void *), void *cookie)
241{
242    stinfo *sti;
243    adb_thread_t t;
244    int s[2];
245
246    if(adb_socketpair(s)) {
247        printf("cannot create service socket pair\n");
248        return -1;
249    }
250
251    sti = malloc(sizeof(stinfo));
252    if(sti == 0) fatal("cannot allocate stinfo");
253    sti->func = func;
254    sti->cookie = cookie;
255    sti->fd = s[1];
256
257    if(adb_thread_create( &t, service_bootstrap_func, sti)){
258        free(sti);
259        adb_close(s[0]);
260        adb_close(s[1]);
261        printf("cannot create service thread\n");
262        return -1;
263    }
264
265    D("service thread started, %d:%d\n",s[0], s[1]);
266    return s[0];
267}
268
269#if !ADB_HOST
270static int create_subprocess(const char *cmd, const char *arg0, const char *arg1, pid_t *pid)
271{
272#ifdef HAVE_WIN32_PROC
273    D("create_subprocess(cmd=%s, arg0=%s, arg1=%s)\n", cmd, arg0, arg1);
274    fprintf(stderr, "error: create_subprocess not implemented on Win32 (%s %s %s)\n", cmd, arg0, arg1);
275    return -1;
276#else /* !HAVE_WIN32_PROC */
277    char *devname;
278    int ptm;
279
280    ptm = unix_open("/dev/ptmx", O_RDWR); // | O_NOCTTY);
281    if(ptm < 0){
282        printf("[ cannot open /dev/ptmx - %s ]\n",strerror(errno));
283        return -1;
284    }
285    fcntl(ptm, F_SETFD, FD_CLOEXEC);
286
287    if(grantpt(ptm) || unlockpt(ptm) ||
288       ((devname = (char*) ptsname(ptm)) == 0)){
289        printf("[ trouble with /dev/ptmx - %s ]\n", strerror(errno));
290        adb_close(ptm);
291        return -1;
292    }
293
294    *pid = fork();
295    if(*pid < 0) {
296        printf("- fork failed: %s -\n", strerror(errno));
297        adb_close(ptm);
298        return -1;
299    }
300
301    if(*pid == 0){
302        int pts;
303
304        setsid();
305
306        pts = unix_open(devname, O_RDWR);
307        if(pts < 0) {
308            fprintf(stderr, "child failed to open pseudo-term slave: %s\n", devname);
309            exit(-1);
310        }
311
312        dup2(pts, 0);
313        dup2(pts, 1);
314        dup2(pts, 2);
315
316        adb_close(pts);
317        adb_close(ptm);
318
319        // set OOM adjustment to zero
320        char text[64];
321        snprintf(text, sizeof text, "/proc/%d/oom_adj", getpid());
322        int fd = adb_open(text, O_WRONLY);
323        if (fd >= 0) {
324            adb_write(fd, "0", 1);
325            adb_close(fd);
326        } else {
327           D("adb: unable to open %s\n", text);
328        }
329        execl(cmd, cmd, arg0, arg1, NULL);
330        fprintf(stderr, "- exec '%s' failed: %s (%d) -\n",
331                cmd, strerror(errno), errno);
332        exit(-1);
333    } else {
334        // Don't set child's OOM adjustment to zero.
335        // Let the child do it itself, as sometimes the parent starts
336        // running before the child has a /proc/pid/oom_adj.
337        // """adb: unable to open /proc/644/oom_adj""" seen in some logs.
338        return ptm;
339    }
340#endif /* !HAVE_WIN32_PROC */
341}
342#endif  /* !ABD_HOST */
343
344#if ADB_HOST
345#define SHELL_COMMAND "/bin/sh"
346#else
347#define SHELL_COMMAND "/system/bin/sh"
348#endif
349
350#if !ADB_HOST
351static void subproc_waiter_service(int fd, void *cookie)
352{
353    pid_t pid = (pid_t)cookie;
354
355    D("entered. fd=%d of pid=%d\n", fd, pid);
356    for (;;) {
357        int status;
358        pid_t p = waitpid(pid, &status, 0);
359        if (p == pid) {
360            D("fd=%d, post waitpid(pid=%d) status=%04x\n", fd, p, status);
361            if (WIFSIGNALED(status)) {
362                D("*** Killed by signal %d\n", WTERMSIG(status));
363                break;
364            } else if (!WIFEXITED(status)) {
365                D("*** Didn't exit!!. status %d\n", status);
366                break;
367            } else if (WEXITSTATUS(status) >= 0) {
368                D("*** Exit code %d\n", WEXITSTATUS(status));
369                break;
370            }
371         }
372        usleep(100000);  // poll every 0.1 sec
373    }
374    D("shell exited fd=%d of pid=%d err=%d\n", fd, pid, errno);
375    if (SHELL_EXIT_NOTIFY_FD >=0) {
376      int res;
377      res = writex(SHELL_EXIT_NOTIFY_FD, &fd, sizeof(fd));
378      D("notified shell exit via fd=%d for pid=%d res=%d errno=%d\n",
379        SHELL_EXIT_NOTIFY_FD, pid, res, errno);
380    }
381}
382
383static int create_subproc_thread(const char *name)
384{
385    stinfo *sti;
386    adb_thread_t t;
387    int ret_fd;
388    pid_t pid;
389    if(name) {
390        ret_fd = create_subprocess(SHELL_COMMAND, "-c", name, &pid);
391    } else {
392        ret_fd = create_subprocess(SHELL_COMMAND, "-", 0, &pid);
393    }
394    D("create_subprocess() ret_fd=%d pid=%d\n", ret_fd, pid);
395
396    sti = malloc(sizeof(stinfo));
397    if(sti == 0) fatal("cannot allocate stinfo");
398    sti->func = subproc_waiter_service;
399    sti->cookie = (void*)pid;
400    sti->fd = ret_fd;
401
402    if(adb_thread_create( &t, service_bootstrap_func, sti)){
403        free(sti);
404        adb_close(ret_fd);
405        printf("cannot create service thread\n");
406        return -1;
407    }
408
409    D("service thread started, fd=%d pid=%d\n",ret_fd, pid);
410    return ret_fd;
411}
412#endif
413
414int service_to_fd(const char *name)
415{
416    int ret = -1;
417
418    if(!strncmp(name, "tcp:", 4)) {
419        int port = atoi(name + 4);
420        name = strchr(name + 4, ':');
421        if(name == 0) {
422            ret = socket_loopback_client(port, SOCK_STREAM);
423            if (ret >= 0)
424                disable_tcp_nagle(ret);
425        } else {
426#if ADB_HOST
427            adb_mutex_lock(&dns_lock);
428            ret = socket_network_client(name + 1, port, SOCK_STREAM);
429            adb_mutex_unlock(&dns_lock);
430#else
431            return -1;
432#endif
433        }
434#ifndef HAVE_WINSOCK   /* winsock doesn't implement unix domain sockets */
435    } else if(!strncmp(name, "local:", 6)) {
436        ret = socket_local_client(name + 6,
437                ANDROID_SOCKET_NAMESPACE_RESERVED, SOCK_STREAM);
438    } else if(!strncmp(name, "localreserved:", 14)) {
439        ret = socket_local_client(name + 14,
440                ANDROID_SOCKET_NAMESPACE_RESERVED, SOCK_STREAM);
441    } else if(!strncmp(name, "localabstract:", 14)) {
442        ret = socket_local_client(name + 14,
443                ANDROID_SOCKET_NAMESPACE_ABSTRACT, SOCK_STREAM);
444    } else if(!strncmp(name, "localfilesystem:", 16)) {
445        ret = socket_local_client(name + 16,
446                ANDROID_SOCKET_NAMESPACE_FILESYSTEM, SOCK_STREAM);
447#endif
448#if ADB_HOST
449    } else if(!strncmp("dns:", name, 4)){
450        char *n = strdup(name + 4);
451        if(n == 0) return -1;
452        ret = create_service_thread(dns_service, n);
453#else /* !ADB_HOST */
454    } else if(!strncmp("dev:", name, 4)) {
455        ret = unix_open(name + 4, O_RDWR);
456    } else if(!strncmp(name, "framebuffer:", 12)) {
457        ret = create_service_thread(framebuffer_service, 0);
458    } else if(recovery_mode && !strncmp(name, "recover:", 8)) {
459        ret = create_service_thread(recover_service, (void*) atoi(name + 8));
460    } else if (!strncmp(name, "jdwp:", 5)) {
461        ret = create_jdwp_connection_fd(atoi(name+5));
462    } else if (!strncmp(name, "log:", 4)) {
463        ret = create_service_thread(log_service, get_log_file_path(name + 4));
464    } else if(!HOST && !strncmp(name, "shell:", 6)) {
465        if(name[6]) {
466            ret = create_subproc_thread(name + 6);
467        } else {
468            ret = create_subproc_thread(0);
469        }
470    } else if(!strncmp(name, "sync:", 5)) {
471        ret = create_service_thread(file_sync_service, NULL);
472    } else if(!strncmp(name, "remount:", 8)) {
473        ret = create_service_thread(remount_service, NULL);
474    } else if(!strncmp(name, "reboot:", 7)) {
475        void* arg = strdup(name + 7);
476        if(arg == 0) return -1;
477        ret = create_service_thread(reboot_service, arg);
478    } else if(!strncmp(name, "root:", 5)) {
479        ret = create_service_thread(restart_root_service, NULL);
480    } else if(!strncmp(name, "backup:", 7)) {
481        char* arg = strdup(name+7);
482        if (arg == NULL) return -1;
483        ret = backup_service(BACKUP, arg);
484    } else if(!strncmp(name, "restore:", 8)) {
485        ret = backup_service(RESTORE, NULL);
486    } else if(!strncmp(name, "tcpip:", 6)) {
487        int port;
488        if (sscanf(name + 6, "%d", &port) == 0) {
489            port = 0;
490        }
491        ret = create_service_thread(restart_tcp_service, (void *)port);
492    } else if(!strncmp(name, "usb:", 4)) {
493        ret = create_service_thread(restart_usb_service, NULL);
494#endif
495#if 0
496    } else if(!strncmp(name, "echo:", 5)){
497        ret = create_service_thread(echo_service, 0);
498#endif
499    }
500    if (ret >= 0) {
501        close_on_exec(ret);
502    }
503    return ret;
504}
505
506#if ADB_HOST
507struct state_info {
508    transport_type transport;
509    char* serial;
510    int state;
511};
512
513static void wait_for_state(int fd, void* cookie)
514{
515    struct state_info* sinfo = cookie;
516    char* err = "unknown error";
517
518    D("wait_for_state %d\n", sinfo->state);
519
520    atransport *t = acquire_one_transport(sinfo->state, sinfo->transport, sinfo->serial, &err);
521    if(t != 0) {
522        writex(fd, "OKAY", 4);
523    } else {
524        sendfailmsg(fd, err);
525    }
526
527    if (sinfo->serial)
528        free(sinfo->serial);
529    free(sinfo);
530    adb_close(fd);
531    D("wait_for_state is done\n");
532}
533#endif
534
535#if ADB_HOST
536asocket*  host_service_to_socket(const char*  name, const char *serial)
537{
538    if (!strcmp(name,"track-devices")) {
539        return create_device_tracker();
540    } else if (!strncmp(name, "wait-for-", strlen("wait-for-"))) {
541        struct state_info* sinfo = malloc(sizeof(struct state_info));
542
543        if (serial)
544            sinfo->serial = strdup(serial);
545        else
546            sinfo->serial = NULL;
547
548        name += strlen("wait-for-");
549
550        if (!strncmp(name, "local", strlen("local"))) {
551            sinfo->transport = kTransportLocal;
552            sinfo->state = CS_DEVICE;
553        } else if (!strncmp(name, "usb", strlen("usb"))) {
554            sinfo->transport = kTransportUsb;
555            sinfo->state = CS_DEVICE;
556        } else if (!strncmp(name, "any", strlen("any"))) {
557            sinfo->transport = kTransportAny;
558            sinfo->state = CS_DEVICE;
559        } else {
560            free(sinfo);
561            return NULL;
562        }
563
564        int fd = create_service_thread(wait_for_state, sinfo);
565        return create_local_socket(fd);
566    }
567    return NULL;
568}
569#endif /* ADB_HOST */
570