services.c revision b6b40079e6d5b32026cc2abfcb71adfd49e8d954 
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/reboot.h>
36#endif
37
38typedef struct stinfo stinfo;
39
40struct stinfo {
41    void (*func)(int fd, void *cookie);
42    int fd;
43    void *cookie;
44};
45
46
47void *service_bootstrap_func(void *x)
48{
49    stinfo *sti = x;
50    sti->func(sti->fd, sti->cookie);
51    free(sti);
52    return 0;
53}
54
55#if ADB_HOST
56ADB_MUTEX_DEFINE( dns_lock );
57
58static void dns_service(int fd, void *cookie)
59{
60    char *hostname = cookie;
61    struct hostent *hp;
62    unsigned zero = 0;
63
64    adb_mutex_lock(&dns_lock);
65    hp = gethostbyname(hostname);
66    free(cookie);
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    free(arg);
189    adb_close(fd);
190}
191
192#endif
193
194#if 0
195static void echo_service(int fd, void *cookie)
196{
197    char buf[4096];
198    int r;
199    char *p;
200    int c;
201
202    for(;;) {
203        r = read(fd, buf, 4096);
204        if(r == 0) goto done;
205        if(r < 0) {
206            if(errno == EINTR) continue;
207            else goto done;
208        }
209
210        c = r;
211        p = buf;
212        while(c > 0) {
213            r = write(fd, p, c);
214            if(r > 0) {
215                c -= r;
216                p += r;
217                continue;
218            }
219            if((r < 0) && (errno == EINTR)) continue;
220            goto done;
221        }
222    }
223done:
224    close(fd);
225}
226#endif
227
228static int create_service_thread(void (*func)(int, void *), void *cookie)
229{
230    stinfo *sti;
231    adb_thread_t t;
232    int s[2];
233
234    if(adb_socketpair(s)) {
235        printf("cannot create service socket pair\n");
236        return -1;
237    }
238
239    sti = malloc(sizeof(stinfo));
240    if(sti == 0) fatal("cannot allocate stinfo");
241    sti->func = func;
242    sti->cookie = cookie;
243    sti->fd = s[1];
244
245    if(adb_thread_create( &t, service_bootstrap_func, sti)){
246        free(sti);
247        adb_close(s[0]);
248        adb_close(s[1]);
249        printf("cannot create service thread\n");
250        return -1;
251    }
252
253    D("service thread started, %d:%d\n",s[0], s[1]);
254    return s[0];
255}
256
257static int create_subprocess(const char *cmd, const char *arg0, const char *arg1)
258{
259#ifdef HAVE_WIN32_PROC
260	fprintf(stderr, "error: create_subprocess not implemented on Win32 (%s %s %s)\n", cmd, arg0, arg1);
261	return -1;
262#else /* !HAVE_WIN32_PROC */
263    char *devname;
264    int ptm;
265    pid_t pid;
266
267    ptm = unix_open("/dev/ptmx", O_RDWR); // | O_NOCTTY);
268    if(ptm < 0){
269        printf("[ cannot open /dev/ptmx - %s ]\n",strerror(errno));
270        return -1;
271    }
272    fcntl(ptm, F_SETFD, FD_CLOEXEC);
273
274    if(grantpt(ptm) || unlockpt(ptm) ||
275       ((devname = (char*) ptsname(ptm)) == 0)){
276        printf("[ trouble with /dev/ptmx - %s ]\n", strerror(errno));
277        return -1;
278    }
279
280    pid = fork();
281    if(pid < 0) {
282        printf("- fork failed: %s -\n", strerror(errno));
283        return -1;
284    }
285
286    if(pid == 0){
287        int pts;
288
289        setsid();
290
291        pts = unix_open(devname, O_RDWR);
292        if(pts < 0) exit(-1);
293
294        dup2(pts, 0);
295        dup2(pts, 1);
296        dup2(pts, 2);
297
298        adb_close(ptm);
299
300        execl(cmd, cmd, arg0, arg1, NULL);
301        fprintf(stderr, "- exec '%s' failed: %s (%d) -\n",
302                cmd, strerror(errno), errno);
303        exit(-1);
304    } else {
305#if !ADB_HOST
306        // set child's OOM adjustment to zero
307        char text[64];
308        snprintf(text, sizeof text, "/proc/%d/oom_adj", pid);
309        int fd = adb_open(text, O_WRONLY);
310        if (fd >= 0) {
311            adb_write(fd, "0", 1);
312            adb_close(fd);
313        } else {
314           D("adb: unable to open %s\n", text);
315        }
316#endif
317        return ptm;
318    }
319#endif /* !HAVE_WIN32_PROC */
320}
321
322#if ADB_HOST
323#define SHELL_COMMAND "/bin/sh"
324#else
325#define SHELL_COMMAND "/system/bin/sh"
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            adb_mutex_lock(&dns_lock);
342            ret = socket_network_client(name + 1, port, SOCK_STREAM);
343            adb_mutex_unlock(&dns_lock);
344#else
345            return -1;
346#endif
347        }
348#ifndef HAVE_WINSOCK   /* winsock doesn't implement unix domain sockets */
349    } else if(!strncmp(name, "local:", 6)) {
350        ret = socket_local_client(name + 6,
351                ANDROID_SOCKET_NAMESPACE_RESERVED, SOCK_STREAM);
352    } else if(!strncmp(name, "localreserved:", 14)) {
353        ret = socket_local_client(name + 14,
354                ANDROID_SOCKET_NAMESPACE_RESERVED, SOCK_STREAM);
355    } else if(!strncmp(name, "localabstract:", 14)) {
356        ret = socket_local_client(name + 14,
357                ANDROID_SOCKET_NAMESPACE_ABSTRACT, SOCK_STREAM);
358    } else if(!strncmp(name, "localfilesystem:", 16)) {
359        ret = socket_local_client(name + 16,
360                ANDROID_SOCKET_NAMESPACE_FILESYSTEM, SOCK_STREAM);
361#endif
362#if ADB_HOST
363    } else if(!strncmp("dns:", name, 4)){
364        char *n = strdup(name + 4);
365        if(n == 0) return -1;
366        ret = create_service_thread(dns_service, n);
367#else /* !ADB_HOST */
368    } else if(!strncmp("dev:", name, 4)) {
369        ret = unix_open(name + 4, O_RDWR);
370    } else if(!strncmp(name, "framebuffer:", 12)) {
371        ret = create_service_thread(framebuffer_service, 0);
372    } else if(recovery_mode && !strncmp(name, "recover:", 8)) {
373        ret = create_service_thread(recover_service, (void*) atoi(name + 8));
374    } else if (!strncmp(name, "jdwp:", 5)) {
375        ret = create_jdwp_connection_fd(atoi(name+5));
376    } else if (!strncmp(name, "log:", 4)) {
377        ret = create_service_thread(log_service, get_log_file_path(name + 4));
378#endif
379    } else if(!HOST && !strncmp(name, "shell:", 6)) {
380        if(name[6]) {
381            ret = create_subprocess(SHELL_COMMAND, "-c", name + 6);
382        } else {
383            ret = create_subprocess(SHELL_COMMAND, "-", 0);
384        }
385#if !ADB_HOST
386    } else if(!strncmp(name, "sync:", 5)) {
387        ret = create_service_thread(file_sync_service, NULL);
388    } else if(!strncmp(name, "remount:", 8)) {
389        ret = create_service_thread(remount_service, NULL);
390    } else if(!strncmp(name, "reboot:", 7)) {
391        void* arg = strdup(name + 7);
392        if(arg == 0) return -1;
393        ret = create_service_thread(reboot_service, arg);
394    } else if(!strncmp(name, "root:", 5)) {
395        ret = create_service_thread(restart_root_service, NULL);
396    } else if(!strncmp(name, "tcpip:", 6)) {
397        int port;
398        if (sscanf(name + 6, "%d", &port) == 0) {
399            port = 0;
400        }
401        ret = create_service_thread(restart_tcp_service, (void *)port);
402    } else if(!strncmp(name, "usb:", 4)) {
403        ret = create_service_thread(restart_usb_service, NULL);
404#endif
405#if 0
406    } else if(!strncmp(name, "echo:", 5)){
407        ret = create_service_thread(echo_service, 0);
408#endif
409    }
410    if (ret >= 0) {
411        close_on_exec(ret);
412    }
413    return ret;
414}
415
416#if ADB_HOST
417struct state_info {
418    transport_type transport;
419    char* serial;
420    int state;
421};
422
423static void wait_for_state(int fd, void* cookie)
424{
425    struct state_info* sinfo = cookie;
426    char* err = "unknown error";
427
428    D("wait_for_state %d\n", sinfo->state);
429
430    atransport *t = acquire_one_transport(sinfo->state, sinfo->transport, sinfo->serial, &err);
431    if(t != 0) {
432        writex(fd, "OKAY", 4);
433    } else {
434        sendfailmsg(fd, err);
435    }
436
437    if (sinfo->serial)
438        free(sinfo->serial);
439    free(sinfo);
440    adb_close(fd);
441    D("wait_for_state is done\n");
442}
443#endif
444
445#if ADB_HOST
446asocket*  host_service_to_socket(const char*  name, const char *serial)
447{
448    if (!strcmp(name,"track-devices")) {
449        return create_device_tracker();
450    } else if (!strncmp(name, "wait-for-", strlen("wait-for-"))) {
451        struct state_info* sinfo = malloc(sizeof(struct state_info));
452
453        if (serial)
454            sinfo->serial = strdup(serial);
455        else
456            sinfo->serial = NULL;
457
458        name += strlen("wait-for-");
459
460        if (!strncmp(name, "local", strlen("local"))) {
461            sinfo->transport = kTransportLocal;
462            sinfo->state = CS_DEVICE;
463        } else if (!strncmp(name, "usb", strlen("usb"))) {
464            sinfo->transport = kTransportUsb;
465            sinfo->state = CS_DEVICE;
466        } else if (!strncmp(name, "any", strlen("any"))) {
467            sinfo->transport = kTransportAny;
468            sinfo->state = CS_DEVICE;
469        } else {
470            free(sinfo);
471            return NULL;
472        }
473
474        int fd = create_service_thread(wait_for_state, sinfo);
475        return create_local_socket(fd);
476    }
477    return NULL;
478}
479#endif /* ADB_HOST */
480