services.c revision f56d1b5a76c6cb282a7689fc93f85de63bd205f6 
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_ADB
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#  endif
34#else
35#include <sys/poll.h>
36#include <sys/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    if(hp == 0) {
68        writex(fd, &zero, 4);
69    } else {
70        writex(fd, hp->h_addr, 4);
71    }
72    adb_mutex_unlock(&dns_lock);
73    adb_close(fd);
74}
75#else
76extern int recovery_mode;
77
78static void recover_service(int s, void *cookie)
79{
80    unsigned char buf[4096];
81    unsigned count = (unsigned) cookie;
82    int fd;
83
84    fd = adb_creat("/tmp/update", 0644);
85    if(fd < 0) {
86        adb_close(s);
87        return;
88    }
89
90    while(count > 0) {
91        unsigned xfer = (count > 4096) ? 4096 : count;
92        if(readx(s, buf, xfer)) break;
93        if(writex(fd, buf, xfer)) break;
94        count -= xfer;
95    }
96
97    if(count == 0) {
98        writex(s, "OKAY", 4);
99    } else {
100        writex(s, "FAIL", 4);
101    }
102    adb_close(fd);
103    adb_close(s);
104
105    fd = adb_creat("/tmp/update.begin", 0644);
106    adb_close(fd);
107}
108
109void restart_root_service(int fd, void *cookie)
110{
111    char buf[100];
112    char value[PROPERTY_VALUE_MAX];
113
114    if (getuid() == 0) {
115        snprintf(buf, sizeof(buf), "adbd is already running as root\n");
116        writex(fd, buf, strlen(buf));
117        adb_close(fd);
118    } else {
119        property_get("ro.debuggable", value, "");
120        if (strcmp(value, "1") != 0) {
121            snprintf(buf, sizeof(buf), "adbd cannot run as root in production builds\n");
122            writex(fd, buf, strlen(buf));
123            adb_close(fd);
124            return;
125        }
126
127        property_set("service.adb.root", "1");
128        snprintf(buf, sizeof(buf), "restarting adbd as root\n");
129        writex(fd, buf, strlen(buf));
130        adb_close(fd);
131
132        // quit, and init will restart us as root
133        sleep(1);
134        exit(1);
135    }
136}
137
138void restart_tcp_service(int fd, void *cookie)
139{
140    char buf[100];
141    char value[PROPERTY_VALUE_MAX];
142    int port = (int)cookie;
143
144    if (port <= 0) {
145        snprintf(buf, sizeof(buf), "invalid port\n");
146        writex(fd, buf, strlen(buf));
147        adb_close(fd);
148        return;
149    }
150
151    snprintf(value, sizeof(value), "%d", port);
152    property_set("service.adb.tcp.port", value);
153    snprintf(buf, sizeof(buf), "restarting in TCP mode port: %d\n", port);
154    writex(fd, buf, strlen(buf));
155    adb_close(fd);
156
157    // quit, and init will restart us in TCP mode
158    sleep(1);
159    exit(1);
160}
161
162void restart_usb_service(int fd, void *cookie)
163{
164    char buf[100];
165
166    property_set("service.adb.tcp.port", "0");
167    snprintf(buf, sizeof(buf), "restarting in USB mode\n");
168    writex(fd, buf, strlen(buf));
169    adb_close(fd);
170
171    // quit, and init will restart us in USB mode
172    sleep(1);
173    exit(1);
174}
175
176void reboot_service(int fd, void *arg)
177{
178    char buf[100];
179    int ret;
180
181    sync();
182    ret = __reboot(LINUX_REBOOT_MAGIC1, LINUX_REBOOT_MAGIC2,
183                    LINUX_REBOOT_CMD_RESTART2, (char *)arg);
184    if (ret < 0) {
185        snprintf(buf, sizeof(buf), "reboot failed: %s\n", strerror(errno));
186        writex(fd, buf, strlen(buf));
187    }
188    adb_close(fd);
189}
190
191#endif
192
193#if 0
194static void echo_service(int fd, void *cookie)
195{
196    char buf[4096];
197    int r;
198    char *p;
199    int c;
200
201    for(;;) {
202        r = read(fd, buf, 4096);
203        if(r == 0) goto done;
204        if(r < 0) {
205            if(errno == EINTR) continue;
206            else goto done;
207        }
208
209        c = r;
210        p = buf;
211        while(c > 0) {
212            r = write(fd, p, c);
213            if(r > 0) {
214                c -= r;
215                p += r;
216                continue;
217            }
218            if((r < 0) && (errno == EINTR)) continue;
219            goto done;
220        }
221    }
222done:
223    close(fd);
224}
225#endif
226
227static int create_service_thread(void (*func)(int, void *), void *cookie)
228{
229    stinfo *sti;
230    adb_thread_t t;
231    int s[2];
232
233    if(adb_socketpair(s)) {
234        printf("cannot create service socket pair\n");
235        return -1;
236    }
237
238    sti = malloc(sizeof(stinfo));
239    if(sti == 0) fatal("cannot allocate stinfo");
240    sti->func = func;
241    sti->cookie = cookie;
242    sti->fd = s[1];
243
244    if(adb_thread_create( &t, service_bootstrap_func, sti)){
245        free(sti);
246        adb_close(s[0]);
247        adb_close(s[1]);
248        printf("cannot create service thread\n");
249        return -1;
250    }
251
252    D("service thread started, %d:%d\n",s[0], s[1]);
253    return s[0];
254}
255
256#if !ADB_HOST
257static int create_subprocess(const char *cmd, const char *arg0, const char *arg1)
258{
259    char *devname;
260    int ptm;
261    pid_t pid;
262
263    ptm = unix_open("/dev/ptmx", O_RDWR); // | O_NOCTTY);
264    if(ptm < 0){
265        printf("[ cannot open /dev/ptmx - %s ]\n",strerror(errno));
266        return -1;
267    }
268    fcntl(ptm, F_SETFD, FD_CLOEXEC);
269
270    if(grantpt(ptm) || unlockpt(ptm) ||
271       ((devname = (char*) ptsname(ptm)) == 0)){
272        printf("[ trouble with /dev/ptmx - %s ]\n", strerror(errno));
273        return -1;
274    }
275
276    pid = fork();
277    if(pid < 0) {
278        printf("- fork failed: %s -\n", strerror(errno));
279        return -1;
280    }
281
282    if(pid == 0){
283        int pts;
284
285        setsid();
286
287        pts = unix_open(devname, O_RDWR);
288        if(pts < 0) exit(-1);
289
290        dup2(pts, 0);
291        dup2(pts, 1);
292        dup2(pts, 2);
293
294        adb_close(ptm);
295
296        execl(cmd, cmd, arg0, arg1, NULL);
297        fprintf(stderr, "- exec '%s' failed: %s (%d) -\n",
298                cmd, strerror(errno), errno);
299        exit(-1);
300    } else {
301        // set child's OOM adjustment to zero
302        char text[64];
303        snprintf(text, sizeof text, "/proc/%d/oom_adj", pid);
304        int fd = adb_open(text, O_WRONLY);
305        if (fd >= 0) {
306            adb_write(fd, "0", 1);
307            adb_close(fd);
308        } else {
309           D("adb: unable to open %s\n", text);
310        }
311
312        return ptm;
313    }
314}
315#endif /* !ADB_HOST */
316
317#if ADB_HOST
318#define SHELL_COMMAND "/bin/sh"
319#else
320#define SHELL_COMMAND "/system/bin/sh"
321#endif
322
323#if !ADB_HOST
324static void shell_service(int s, void *command)
325{
326    char    buffer[MAX_PAYLOAD];
327    char    buffer2[MAX_PAYLOAD];
328    struct pollfd ufds[2];
329    int     fd, ret = 0;
330    unsigned count = 0;
331    char** args = (char **)command;
332    fd = create_subprocess(SHELL_COMMAND, args[0], args[1]);
333
334    while (1) {
335        while (count < sizeof(buffer)) {
336            ufds[0].fd = fd;
337            ufds[0].events = POLLIN | POLLHUP;
338            ufds[0].revents = 0;
339            ufds[1].fd = s;
340            ufds[1].events = POLLIN | POLLHUP;
341            ufds[1].revents = 0;
342            // use a 100ms timeout so we don't block indefinitely with our
343            // buffer partially filled.
344            ret = poll(ufds, 2, 100);
345            if (ret <= 0) {
346                D("poll returned %d\n", ret);
347                // file has closed or we timed out
348                // set ret to 1 so we don't exit the outer loop
349                ret = 1;
350                break;
351            }
352
353            if (ufds[0].revents & POLLIN) {
354                ret = adb_read(fd, buffer + count, sizeof(buffer) - count);
355                D("read fd ret: %d, count: %d\n", ret, count);
356                if (ret > 0)
357                    count += ret;
358                else
359                    break;
360            }
361            if (ufds[1].revents & POLLIN) {
362                ret = adb_read(s, buffer2, sizeof(buffer2));
363                D("read s ret: %d\n", ret);
364                if (ret > 0)
365                    adb_write(fd, buffer2, ret);
366                else
367                    break;
368            }
369
370            if ((ufds[0].revents & POLLHUP) || (ufds[1].revents & POLLHUP)) {
371                // set flag to exit after flushing the buffer
372                ret = -1;
373                break;
374            }
375        }
376
377        D("writing: %d\n", count);
378        if (count > 0) {
379            adb_write(s, buffer, count);
380            count = 0;
381        }
382        if (ret <= 0)
383            break;
384    }
385
386    D("shell_service done\n");
387
388    adb_close(fd);
389    adb_close(s);
390}
391#endif // !ADB_HOST
392
393int service_to_fd(const char *name)
394{
395    int ret = -1;
396
397    if(!strncmp(name, "tcp:", 4)) {
398        int port = atoi(name + 4);
399        name = strchr(name + 4, ':');
400        if(name == 0) {
401            ret = socket_loopback_client(port, SOCK_STREAM);
402            if (ret >= 0)
403                disable_tcp_nagle(ret);
404        } else {
405#if ADB_HOST
406            adb_mutex_lock(&dns_lock);
407            ret = socket_network_client(name + 1, port, SOCK_STREAM);
408            adb_mutex_unlock(&dns_lock);
409#else
410            return -1;
411#endif
412        }
413#ifndef HAVE_WINSOCK   /* winsock doesn't implement unix domain sockets */
414    } else if(!strncmp(name, "local:", 6)) {
415        ret = socket_local_client(name + 6,
416                ANDROID_SOCKET_NAMESPACE_RESERVED, SOCK_STREAM);
417    } else if(!strncmp(name, "localreserved:", 14)) {
418        ret = socket_local_client(name + 14,
419                ANDROID_SOCKET_NAMESPACE_RESERVED, SOCK_STREAM);
420    } else if(!strncmp(name, "localabstract:", 14)) {
421        ret = socket_local_client(name + 14,
422                ANDROID_SOCKET_NAMESPACE_ABSTRACT, SOCK_STREAM);
423    } else if(!strncmp(name, "localfilesystem:", 16)) {
424        ret = socket_local_client(name + 16,
425                ANDROID_SOCKET_NAMESPACE_FILESYSTEM, SOCK_STREAM);
426#endif
427#if ADB_HOST
428    } else if(!strncmp("dns:", name, 4)){
429        char *n = strdup(name + 4);
430        if(n == 0) return -1;
431        ret = create_service_thread(dns_service, n);
432#else /* !ADB_HOST */
433    } else if(!strncmp("dev:", name, 4)) {
434        ret = unix_open(name + 4, O_RDWR);
435    } else if(!strncmp(name, "framebuffer:", 12)) {
436        ret = create_service_thread(framebuffer_service, 0);
437    } else if(recovery_mode && !strncmp(name, "recover:", 8)) {
438        ret = create_service_thread(recover_service, (void*) atoi(name + 8));
439    } else if (!strncmp(name, "jdwp:", 5)) {
440        ret = create_jdwp_connection_fd(atoi(name+5));
441    } else if (!strncmp(name, "log:", 4)) {
442        ret = create_service_thread(log_service, get_log_file_path(name + 4));
443    } else if(!HOST && !strncmp(name, "shell:", 6)) {
444        const char* args[2];
445        if(name[6]) {
446            args[0] = "-c";
447            args[1] = name + 6;
448        } else {
449            args[0] = "-";
450            args[1] = 0;
451        }
452        ret = create_service_thread(shell_service, (void *)args);
453    } else if(!strncmp(name, "sync:", 5)) {
454        ret = create_service_thread(file_sync_service, NULL);
455    } else if(!strncmp(name, "remount:", 8)) {
456        ret = create_service_thread(remount_service, NULL);
457    } else if(!strncmp(name, "reboot:", 7)) {
458        const char* arg = name + 7;
459        if (*name == 0)
460            arg = NULL;
461        ret = create_service_thread(reboot_service, (void *)arg);
462    } else if(!strncmp(name, "root:", 5)) {
463        ret = create_service_thread(restart_root_service, NULL);
464    } else if(!strncmp(name, "tcpip:", 6)) {
465        int port;
466        if (sscanf(name + 6, "%d", &port) == 0) {
467            port = 0;
468        }
469        ret = create_service_thread(restart_tcp_service, (void *)port);
470    } else if(!strncmp(name, "usb:", 4)) {
471        ret = create_service_thread(restart_usb_service, NULL);
472#endif
473#if 0
474    } else if(!strncmp(name, "echo:", 5)){
475        ret = create_service_thread(echo_service, 0);
476#endif
477    }
478    if (ret >= 0) {
479        close_on_exec(ret);
480    }
481    return ret;
482}
483
484#if ADB_HOST
485struct state_info {
486    transport_type transport;
487    char* serial;
488    int state;
489};
490
491static void wait_for_state(int fd, void* cookie)
492{
493    struct state_info* sinfo = cookie;
494    char* err = "unknown error";
495
496    D("wait_for_state %d\n", sinfo->state);
497
498    atransport *t = acquire_one_transport(sinfo->state, sinfo->transport, sinfo->serial, &err);
499    if(t != 0) {
500        writex(fd, "OKAY", 4);
501    } else {
502        sendfailmsg(fd, err);
503    }
504
505    if (sinfo->serial)
506        free(sinfo->serial);
507    free(sinfo);
508    adb_close(fd);
509    D("wait_for_state is done\n");
510}
511#endif
512
513#if ADB_HOST
514asocket*  host_service_to_socket(const char*  name, const char *serial)
515{
516    if (!strcmp(name,"track-devices")) {
517        return create_device_tracker();
518    } else if (!strncmp(name, "wait-for-", strlen("wait-for-"))) {
519        struct state_info* sinfo = malloc(sizeof(struct state_info));
520
521        if (serial)
522            sinfo->serial = strdup(serial);
523        else
524            sinfo->serial = NULL;
525
526        name += strlen("wait-for-");
527
528        if (!strncmp(name, "local", strlen("local"))) {
529            sinfo->transport = kTransportLocal;
530            sinfo->state = CS_DEVICE;
531        } else if (!strncmp(name, "usb", strlen("usb"))) {
532            sinfo->transport = kTransportUsb;
533            sinfo->state = CS_DEVICE;
534        } else if (!strncmp(name, "any", strlen("any"))) {
535            sinfo->transport = kTransportAny;
536            sinfo->state = CS_DEVICE;
537        } else {
538            free(sinfo);
539            return NULL;
540        }
541
542        int fd = create_service_thread(wait_for_state, sinfo);
543        return create_local_socket(fd);
544    }
545    return NULL;
546}
547#endif /* ADB_HOST */
548