builtins.c revision e50ac5f7771872331df70251d23d6bd8155da4a7 
1/*
2 * Copyright (C) 2008 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 <sys/types.h>
18#include <sys/stat.h>
19#include <fcntl.h>
20#include <unistd.h>
21#include <string.h>
22#include <stdio.h>
23#include <linux/kd.h>
24#include <errno.h>
25#include <sys/socket.h>
26#include <netinet/in.h>
27#include <linux/if.h>
28#include <arpa/inet.h>
29#include <stdlib.h>
30#include <sys/mount.h>
31#include <sys/resource.h>
32#include <sys/wait.h>
33#include <linux/loop.h>
34#include <cutils/partition_utils.h>
35#include <sys/system_properties.h>
36#include <fs_mgr.h>
37
38#ifdef HAVE_SELINUX
39#include <selinux/selinux.h>
40#include <selinux/label.h>
41#endif
42
43#include "init.h"
44#include "keywords.h"
45#include "property_service.h"
46#include "devices.h"
47#include "init_parser.h"
48#include "util.h"
49#include "log.h"
50
51#include <private/android_filesystem_config.h>
52
53void add_environment(const char *name, const char *value);
54
55extern int init_module(void *, unsigned long, const char *);
56
57static int write_file(const char *path, const char *value)
58{
59    int fd, ret, len;
60
61    fd = open(path, O_WRONLY|O_CREAT, 0622);
62
63    if (fd < 0)
64        return -errno;
65
66    len = strlen(value);
67
68    do {
69        ret = write(fd, value, len);
70    } while (ret < 0 && errno == EINTR);
71
72    close(fd);
73    if (ret < 0) {
74        return -errno;
75    } else {
76        return 0;
77    }
78}
79
80static int _open(const char *path)
81{
82    int fd;
83
84    fd = open(path, O_RDONLY | O_NOFOLLOW);
85    if (fd < 0)
86        fd = open(path, O_WRONLY | O_NOFOLLOW);
87
88    return fd;
89}
90
91static int _chown(const char *path, unsigned int uid, unsigned int gid)
92{
93    int fd;
94    int ret;
95
96    fd = _open(path);
97    if (fd < 0) {
98        return -1;
99    }
100
101    ret = fchown(fd, uid, gid);
102    if (ret < 0) {
103        int errno_copy = errno;
104        close(fd);
105        errno = errno_copy;
106        return -1;
107    }
108
109    close(fd);
110
111    return 0;
112}
113
114static int _chmod(const char *path, mode_t mode)
115{
116    int fd;
117    int ret;
118
119    fd = _open(path);
120    if (fd < 0) {
121        return -1;
122    }
123
124    ret = fchmod(fd, mode);
125    if (ret < 0) {
126        int errno_copy = errno;
127        close(fd);
128        errno = errno_copy;
129        return -1;
130    }
131
132    close(fd);
133
134    return 0;
135}
136
137static int insmod(const char *filename, char *options)
138{
139    void *module;
140    unsigned size;
141    int ret;
142
143    module = read_file(filename, &size);
144    if (!module)
145        return -1;
146
147    ret = init_module(module, size, options);
148
149    free(module);
150
151    return ret;
152}
153
154static int setkey(struct kbentry *kbe)
155{
156    int fd, ret;
157
158    fd = open("/dev/tty0", O_RDWR | O_SYNC);
159    if (fd < 0)
160        return -1;
161
162    ret = ioctl(fd, KDSKBENT, kbe);
163
164    close(fd);
165    return ret;
166}
167
168static int __ifupdown(const char *interface, int up)
169{
170    struct ifreq ifr;
171    int s, ret;
172
173    strlcpy(ifr.ifr_name, interface, IFNAMSIZ);
174
175    s = socket(AF_INET, SOCK_DGRAM, 0);
176    if (s < 0)
177        return -1;
178
179    ret = ioctl(s, SIOCGIFFLAGS, &ifr);
180    if (ret < 0) {
181        goto done;
182    }
183
184    if (up)
185        ifr.ifr_flags |= IFF_UP;
186    else
187        ifr.ifr_flags &= ~IFF_UP;
188
189    ret = ioctl(s, SIOCSIFFLAGS, &ifr);
190
191done:
192    close(s);
193    return ret;
194}
195
196static void service_start_if_not_disabled(struct service *svc)
197{
198    if (!(svc->flags & SVC_DISABLED)) {
199        service_start(svc, NULL);
200    }
201}
202
203int do_chdir(int nargs, char **args)
204{
205    chdir(args[1]);
206    return 0;
207}
208
209int do_chroot(int nargs, char **args)
210{
211    chroot(args[1]);
212    return 0;
213}
214
215int do_class_start(int nargs, char **args)
216{
217        /* Starting a class does not start services
218         * which are explicitly disabled.  They must
219         * be started individually.
220         */
221    service_for_each_class(args[1], service_start_if_not_disabled);
222    return 0;
223}
224
225int do_class_stop(int nargs, char **args)
226{
227    service_for_each_class(args[1], service_stop);
228    return 0;
229}
230
231int do_class_reset(int nargs, char **args)
232{
233    service_for_each_class(args[1], service_reset);
234    return 0;
235}
236
237int do_domainname(int nargs, char **args)
238{
239    return write_file("/proc/sys/kernel/domainname", args[1]);
240}
241
242int do_exec(int nargs, char **args)
243{
244    return -1;
245}
246
247int do_export(int nargs, char **args)
248{
249    add_environment(args[1], args[2]);
250    return 0;
251}
252
253int do_hostname(int nargs, char **args)
254{
255    return write_file("/proc/sys/kernel/hostname", args[1]);
256}
257
258int do_ifup(int nargs, char **args)
259{
260    return __ifupdown(args[1], 1);
261}
262
263
264static int do_insmod_inner(int nargs, char **args, int opt_len)
265{
266    char options[opt_len + 1];
267    int i;
268
269    options[0] = '\0';
270    if (nargs > 2) {
271        strcpy(options, args[2]);
272        for (i = 3; i < nargs; ++i) {
273            strcat(options, " ");
274            strcat(options, args[i]);
275        }
276    }
277
278    return insmod(args[1], options);
279}
280
281int do_insmod(int nargs, char **args)
282{
283    int i;
284    int size = 0;
285
286    if (nargs > 2) {
287        for (i = 2; i < nargs; ++i)
288            size += strlen(args[i]) + 1;
289    }
290
291    return do_insmod_inner(nargs, args, size);
292}
293
294int do_mkdir(int nargs, char **args)
295{
296    mode_t mode = 0755;
297    int ret;
298
299    /* mkdir <path> [mode] [owner] [group] */
300
301    if (nargs >= 3) {
302        mode = strtoul(args[2], 0, 8);
303    }
304
305    ret = make_dir(args[1], mode);
306    /* chmod in case the directory already exists */
307    if (ret == -1 && errno == EEXIST) {
308        ret = _chmod(args[1], mode);
309    }
310    if (ret == -1) {
311        return -errno;
312    }
313
314    if (nargs >= 4) {
315        uid_t uid = decode_uid(args[3]);
316        gid_t gid = -1;
317
318        if (nargs == 5) {
319            gid = decode_uid(args[4]);
320        }
321
322        if (_chown(args[1], uid, gid) < 0) {
323            return -errno;
324        }
325    }
326
327    return 0;
328}
329
330static struct {
331    const char *name;
332    unsigned flag;
333} mount_flags[] = {
334    { "noatime",    MS_NOATIME },
335    { "noexec",     MS_NOEXEC },
336    { "nosuid",     MS_NOSUID },
337    { "nodev",      MS_NODEV },
338    { "nodiratime", MS_NODIRATIME },
339    { "ro",         MS_RDONLY },
340    { "rw",         0 },
341    { "remount",    MS_REMOUNT },
342    { "bind",       MS_BIND },
343    { "rec",        MS_REC },
344    { "unbindable", MS_UNBINDABLE },
345    { "private",    MS_PRIVATE },
346    { "slave",      MS_SLAVE },
347    { "shared",     MS_SHARED },
348    { "defaults",   0 },
349    { 0,            0 },
350};
351
352#define DATA_MNT_POINT "/data"
353
354/* mount <type> <device> <path> <flags ...> <options> */
355int do_mount(int nargs, char **args)
356{
357    char tmp[64];
358    char *source, *target, *system;
359    char *options = NULL;
360    unsigned flags = 0;
361    int n, i;
362    int wait = 0;
363
364    for (n = 4; n < nargs; n++) {
365        for (i = 0; mount_flags[i].name; i++) {
366            if (!strcmp(args[n], mount_flags[i].name)) {
367                flags |= mount_flags[i].flag;
368                break;
369            }
370        }
371
372        if (!mount_flags[i].name) {
373            if (!strcmp(args[n], "wait"))
374                wait = 1;
375            /* if our last argument isn't a flag, wolf it up as an option string */
376            else if (n + 1 == nargs)
377                options = args[n];
378        }
379    }
380
381    system = args[1];
382    source = args[2];
383    target = args[3];
384
385    if (!strncmp(source, "mtd@", 4)) {
386        n = mtd_name_to_number(source + 4);
387        if (n < 0) {
388            return -1;
389        }
390
391        sprintf(tmp, "/dev/block/mtdblock%d", n);
392
393        if (wait)
394            wait_for_file(tmp, COMMAND_RETRY_TIMEOUT);
395        if (mount(tmp, target, system, flags, options) < 0) {
396            return -1;
397        }
398
399        goto exit_success;
400    } else if (!strncmp(source, "loop@", 5)) {
401        int mode, loop, fd;
402        struct loop_info info;
403
404        mode = (flags & MS_RDONLY) ? O_RDONLY : O_RDWR;
405        fd = open(source + 5, mode);
406        if (fd < 0) {
407            return -1;
408        }
409
410        for (n = 0; ; n++) {
411            sprintf(tmp, "/dev/block/loop%d", n);
412            loop = open(tmp, mode);
413            if (loop < 0) {
414                return -1;
415            }
416
417            /* if it is a blank loop device */
418            if (ioctl(loop, LOOP_GET_STATUS, &info) < 0 && errno == ENXIO) {
419                /* if it becomes our loop device */
420                if (ioctl(loop, LOOP_SET_FD, fd) >= 0) {
421                    close(fd);
422
423                    if (mount(tmp, target, system, flags, options) < 0) {
424                        ioctl(loop, LOOP_CLR_FD, 0);
425                        close(loop);
426                        return -1;
427                    }
428
429                    close(loop);
430                    goto exit_success;
431                }
432            }
433
434            close(loop);
435        }
436
437        close(fd);
438        ERROR("out of loopback devices");
439        return -1;
440    } else {
441        if (wait)
442            wait_for_file(source, COMMAND_RETRY_TIMEOUT);
443        if (mount(source, target, system, flags, options) < 0) {
444            return -1;
445        }
446
447    }
448
449exit_success:
450    return 0;
451
452}
453
454int do_mount_all(int nargs, char **args)
455{
456    pid_t pid;
457    int ret = -1;
458    int child_ret = -1;
459    int status;
460    const char *prop;
461
462    if (nargs != 2) {
463        return -1;
464    }
465
466    /*
467     * Call fs_mgr_mount_all() to mount all filesystems.  We fork(2) and
468     * do the call in the child to provide protection to the main init
469     * process if anything goes wrong (crash or memory leak), and wait for
470     * the child to finish in the parent.
471     */
472    pid = fork();
473    if (pid > 0) {
474        /* Parent.  Wait for the child to return */
475        waitpid(pid, &status, 0);
476        if (WIFEXITED(status)) {
477            ret = WEXITSTATUS(status);
478        } else {
479            ret = -1;
480        }
481    } else if (pid == 0) {
482        /* child, call fs_mgr_mount_all() */
483        klog_set_level(6);  /* So we can see what fs_mgr_mount_all() does */
484        child_ret = fs_mgr_mount_all(args[1]);
485        if (child_ret == -1) {
486            ERROR("fs_mgr_mount_all returned an error\n");
487        }
488        exit(child_ret);
489    } else {
490        /* fork failed, return an error */
491        return -1;
492    }
493
494    /* ret is 1 if the device is encrypted, 0 if not, and -1 on error */
495    if (ret == 1) {
496        property_set("ro.crypto.state", "encrypted");
497        property_set("vold.decrypt", "1");
498    } else if (ret == 0) {
499        property_set("ro.crypto.state", "unencrypted");
500        /* If fs_mgr determined this is an unencrypted device, then trigger
501         * that action.
502         */
503        action_for_each_trigger("nonencrypted", action_add_queue_tail);
504    }
505
506    return ret;
507}
508
509int do_setcon(int nargs, char **args) {
510#ifdef HAVE_SELINUX
511    if (is_selinux_enabled() <= 0)
512        return 0;
513    if (setcon(args[1]) < 0) {
514        return -errno;
515    }
516#endif
517    return 0;
518}
519
520int do_setenforce(int nargs, char **args) {
521#ifdef HAVE_SELINUX
522    if (is_selinux_enabled() <= 0)
523        return 0;
524    if (security_setenforce(atoi(args[1])) < 0) {
525        return -errno;
526    }
527#endif
528    return 0;
529}
530
531int do_setkey(int nargs, char **args)
532{
533    struct kbentry kbe;
534    kbe.kb_table = strtoul(args[1], 0, 0);
535    kbe.kb_index = strtoul(args[2], 0, 0);
536    kbe.kb_value = strtoul(args[3], 0, 0);
537    return setkey(&kbe);
538}
539
540int do_setprop(int nargs, char **args)
541{
542    const char *name = args[1];
543    const char *value = args[2];
544    char prop_val[PROP_VALUE_MAX];
545    int ret;
546
547    ret = expand_props(prop_val, value, sizeof(prop_val));
548    if (ret) {
549        ERROR("cannot expand '%s' while assigning to '%s'\n", value, name);
550        return -EINVAL;
551    }
552    property_set(name, prop_val);
553    return 0;
554}
555
556int do_setrlimit(int nargs, char **args)
557{
558    struct rlimit limit;
559    int resource;
560    resource = atoi(args[1]);
561    limit.rlim_cur = atoi(args[2]);
562    limit.rlim_max = atoi(args[3]);
563    return setrlimit(resource, &limit);
564}
565
566int do_start(int nargs, char **args)
567{
568    struct service *svc;
569    svc = service_find_by_name(args[1]);
570    if (svc) {
571        service_start(svc, NULL);
572    }
573    return 0;
574}
575
576int do_stop(int nargs, char **args)
577{
578    struct service *svc;
579    svc = service_find_by_name(args[1]);
580    if (svc) {
581        service_stop(svc);
582    }
583    return 0;
584}
585
586int do_restart(int nargs, char **args)
587{
588    struct service *svc;
589    svc = service_find_by_name(args[1]);
590    if (svc) {
591        service_stop(svc);
592        service_start(svc, NULL);
593    }
594    return 0;
595}
596
597int do_trigger(int nargs, char **args)
598{
599    action_for_each_trigger(args[1], action_add_queue_tail);
600    return 0;
601}
602
603int do_symlink(int nargs, char **args)
604{
605    return symlink(args[1], args[2]);
606}
607
608int do_rm(int nargs, char **args)
609{
610    return unlink(args[1]);
611}
612
613int do_rmdir(int nargs, char **args)
614{
615    return rmdir(args[1]);
616}
617
618int do_sysclktz(int nargs, char **args)
619{
620    struct timezone tz;
621
622    if (nargs != 2)
623        return -1;
624
625    memset(&tz, 0, sizeof(tz));
626    tz.tz_minuteswest = atoi(args[1]);
627    if (settimeofday(NULL, &tz))
628        return -1;
629    return 0;
630}
631
632int do_write(int nargs, char **args)
633{
634    const char *path = args[1];
635    const char *value = args[2];
636    char prop_val[PROP_VALUE_MAX];
637    int ret;
638
639    ret = expand_props(prop_val, value, sizeof(prop_val));
640    if (ret) {
641        ERROR("cannot expand '%s' while writing to '%s'\n", value, path);
642        return -EINVAL;
643    }
644    return write_file(path, prop_val);
645}
646
647int do_copy(int nargs, char **args)
648{
649    char *buffer = NULL;
650    int rc = 0;
651    int fd1 = -1, fd2 = -1;
652    struct stat info;
653    int brtw, brtr;
654    char *p;
655
656    if (nargs != 3)
657        return -1;
658
659    if (stat(args[1], &info) < 0)
660        return -1;
661
662    if ((fd1 = open(args[1], O_RDONLY)) < 0)
663        goto out_err;
664
665    if ((fd2 = open(args[2], O_WRONLY|O_CREAT|O_TRUNC, 0660)) < 0)
666        goto out_err;
667
668    if (!(buffer = malloc(info.st_size)))
669        goto out_err;
670
671    p = buffer;
672    brtr = info.st_size;
673    while(brtr) {
674        rc = read(fd1, p, brtr);
675        if (rc < 0)
676            goto out_err;
677        if (rc == 0)
678            break;
679        p += rc;
680        brtr -= rc;
681    }
682
683    p = buffer;
684    brtw = info.st_size;
685    while(brtw) {
686        rc = write(fd2, p, brtw);
687        if (rc < 0)
688            goto out_err;
689        if (rc == 0)
690            break;
691        p += rc;
692        brtw -= rc;
693    }
694
695    rc = 0;
696    goto out;
697out_err:
698    rc = -1;
699out:
700    if (buffer)
701        free(buffer);
702    if (fd1 >= 0)
703        close(fd1);
704    if (fd2 >= 0)
705        close(fd2);
706    return rc;
707}
708
709int do_chown(int nargs, char **args) {
710    /* GID is optional. */
711    if (nargs == 3) {
712        if (_chown(args[2], decode_uid(args[1]), -1) < 0)
713            return -errno;
714    } else if (nargs == 4) {
715        if (_chown(args[3], decode_uid(args[1]), decode_uid(args[2])) < 0)
716            return -errno;
717    } else {
718        return -1;
719    }
720    return 0;
721}
722
723static mode_t get_mode(const char *s) {
724    mode_t mode = 0;
725    while (*s) {
726        if (*s >= '0' && *s <= '7') {
727            mode = (mode<<3) | (*s-'0');
728        } else {
729            return -1;
730        }
731        s++;
732    }
733    return mode;
734}
735
736int do_chmod(int nargs, char **args) {
737    mode_t mode = get_mode(args[1]);
738    if (_chmod(args[2], mode) < 0) {
739        return -errno;
740    }
741    return 0;
742}
743
744int do_restorecon(int nargs, char **args) {
745    int i;
746
747    for (i = 1; i < nargs; i++) {
748        if (restorecon(args[i]) < 0)
749            return -errno;
750    }
751    return 0;
752}
753
754int do_setsebool(int nargs, char **args) {
755#ifdef HAVE_SELINUX
756    SELboolean *b = alloca(nargs * sizeof(SELboolean));
757    char *v;
758    int i;
759
760    if (is_selinux_enabled() <= 0)
761        return 0;
762
763    for (i = 1; i < nargs; i++) {
764        char *name = args[i];
765        v = strchr(name, '=');
766        if (!v) {
767            ERROR("setsebool: argument %s had no =\n", name);
768            return -EINVAL;
769        }
770        *v++ = 0;
771        b[i-1].name = name;
772        if (!strcmp(v, "1") || !strcasecmp(v, "true") || !strcasecmp(v, "on"))
773            b[i-1].value = 1;
774        else if (!strcmp(v, "0") || !strcasecmp(v, "false") || !strcasecmp(v, "off"))
775            b[i-1].value = 0;
776        else {
777            ERROR("setsebool: invalid value %s\n", v);
778            return -EINVAL;
779        }
780    }
781
782    if (security_set_boolean_list(nargs - 1, b, 0) < 0)
783        return -errno;
784#endif
785    return 0;
786}
787
788int do_loglevel(int nargs, char **args) {
789    if (nargs == 2) {
790        klog_set_level(atoi(args[1]));
791        return 0;
792    }
793    return -1;
794}
795
796int do_load_persist_props(int nargs, char **args) {
797    if (nargs == 1) {
798        load_persist_props();
799        return 0;
800    }
801    return -1;
802}
803
804int do_wait(int nargs, char **args)
805{
806    if (nargs == 2) {
807        return wait_for_file(args[1], COMMAND_RETRY_TIMEOUT);
808    }
809    return -1;
810}
811