builtins.c revision 7c386a610d9164c12932452d1ff671e070956ec1 
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    { "defaults",   0 },
343    { 0,            0 },
344};
345
346#define DATA_MNT_POINT "/data"
347
348/* mount <type> <device> <path> <flags ...> <options> */
349int do_mount(int nargs, char **args)
350{
351    char tmp[64];
352    char *source, *target, *system;
353    char *options = NULL;
354    unsigned flags = 0;
355    int n, i;
356    int wait = 0;
357
358    for (n = 4; n < nargs; n++) {
359        for (i = 0; mount_flags[i].name; i++) {
360            if (!strcmp(args[n], mount_flags[i].name)) {
361                flags |= mount_flags[i].flag;
362                break;
363            }
364        }
365
366        if (!mount_flags[i].name) {
367            if (!strcmp(args[n], "wait"))
368                wait = 1;
369            /* if our last argument isn't a flag, wolf it up as an option string */
370            else if (n + 1 == nargs)
371                options = args[n];
372        }
373    }
374
375    system = args[1];
376    source = args[2];
377    target = args[3];
378
379    if (!strncmp(source, "mtd@", 4)) {
380        n = mtd_name_to_number(source + 4);
381        if (n < 0) {
382            return -1;
383        }
384
385        sprintf(tmp, "/dev/block/mtdblock%d", n);
386
387        if (wait)
388            wait_for_file(tmp, COMMAND_RETRY_TIMEOUT);
389        if (mount(tmp, target, system, flags, options) < 0) {
390            return -1;
391        }
392
393        goto exit_success;
394    } else if (!strncmp(source, "loop@", 5)) {
395        int mode, loop, fd;
396        struct loop_info info;
397
398        mode = (flags & MS_RDONLY) ? O_RDONLY : O_RDWR;
399        fd = open(source + 5, mode);
400        if (fd < 0) {
401            return -1;
402        }
403
404        for (n = 0; ; n++) {
405            sprintf(tmp, "/dev/block/loop%d", n);
406            loop = open(tmp, mode);
407            if (loop < 0) {
408                return -1;
409            }
410
411            /* if it is a blank loop device */
412            if (ioctl(loop, LOOP_GET_STATUS, &info) < 0 && errno == ENXIO) {
413                /* if it becomes our loop device */
414                if (ioctl(loop, LOOP_SET_FD, fd) >= 0) {
415                    close(fd);
416
417                    if (mount(tmp, target, system, flags, options) < 0) {
418                        ioctl(loop, LOOP_CLR_FD, 0);
419                        close(loop);
420                        return -1;
421                    }
422
423                    close(loop);
424                    goto exit_success;
425                }
426            }
427
428            close(loop);
429        }
430
431        close(fd);
432        ERROR("out of loopback devices");
433        return -1;
434    } else {
435        if (wait)
436            wait_for_file(source, COMMAND_RETRY_TIMEOUT);
437        if (mount(source, target, system, flags, options) < 0) {
438            return -1;
439        }
440
441    }
442
443exit_success:
444    return 0;
445
446}
447
448int do_mount_all(int nargs, char **args)
449{
450    pid_t pid;
451    int ret = -1;
452    int child_ret = -1;
453    int status;
454    const char *prop;
455
456    if (nargs != 2) {
457        return -1;
458    }
459
460    /*
461     * Call fs_mgr_mount_all() to mount all filesystems.  We fork(2) and
462     * do the call in the child to provide protection to the main init
463     * process if anything goes wrong (crash or memory leak), and wait for
464     * the child to finish in the parent.
465     */
466    pid = fork();
467    if (pid > 0) {
468        /* Parent.  Wait for the child to return */
469        waitpid(pid, &status, 0);
470        if (WIFEXITED(status)) {
471            ret = WEXITSTATUS(status);
472        } else {
473            ret = -1;
474        }
475    } else if (pid == 0) {
476        /* child, call fs_mgr_mount_all() */
477        klog_set_level(6);  /* So we can see what fs_mgr_mount_all() does */
478        child_ret = fs_mgr_mount_all(args[1]);
479        if (child_ret == -1) {
480            ERROR("fs_mgr_mount_all returned an error\n");
481        }
482        exit(child_ret);
483    } else {
484        /* fork failed, return an error */
485        return -1;
486    }
487
488    /* ret is 1 if the device is encrypted, 0 if not, and -1 on error */
489    if (ret == 1) {
490        property_set("ro.crypto.state", "encrypted");
491        property_set("vold.decrypt", "1");
492    } else if (ret == 0) {
493        property_set("ro.crypto.state", "unencrypted");
494        /* If fs_mgr determined this is an unencrypted device, then trigger
495         * that action.
496         */
497        action_for_each_trigger("nonencrypted", action_add_queue_tail);
498    }
499
500    return ret;
501}
502
503int do_setcon(int nargs, char **args) {
504#ifdef HAVE_SELINUX
505    if (is_selinux_enabled() <= 0)
506        return 0;
507    if (setcon(args[1]) < 0) {
508        return -errno;
509    }
510#endif
511    return 0;
512}
513
514int do_setenforce(int nargs, char **args) {
515#ifdef HAVE_SELINUX
516    if (is_selinux_enabled() <= 0)
517        return 0;
518    if (security_setenforce(atoi(args[1])) < 0) {
519        return -errno;
520    }
521#endif
522    return 0;
523}
524
525int do_setkey(int nargs, char **args)
526{
527    struct kbentry kbe;
528    kbe.kb_table = strtoul(args[1], 0, 0);
529    kbe.kb_index = strtoul(args[2], 0, 0);
530    kbe.kb_value = strtoul(args[3], 0, 0);
531    return setkey(&kbe);
532}
533
534int do_setprop(int nargs, char **args)
535{
536    const char *name = args[1];
537    const char *value = args[2];
538    char prop_val[PROP_VALUE_MAX];
539    int ret;
540
541    ret = expand_props(prop_val, value, sizeof(prop_val));
542    if (ret) {
543        ERROR("cannot expand '%s' while assigning to '%s'\n", value, name);
544        return -EINVAL;
545    }
546    property_set(name, prop_val);
547    return 0;
548}
549
550int do_setrlimit(int nargs, char **args)
551{
552    struct rlimit limit;
553    int resource;
554    resource = atoi(args[1]);
555    limit.rlim_cur = atoi(args[2]);
556    limit.rlim_max = atoi(args[3]);
557    return setrlimit(resource, &limit);
558}
559
560int do_start(int nargs, char **args)
561{
562    struct service *svc;
563    svc = service_find_by_name(args[1]);
564    if (svc) {
565        service_start(svc, NULL);
566    }
567    return 0;
568}
569
570int do_stop(int nargs, char **args)
571{
572    struct service *svc;
573    svc = service_find_by_name(args[1]);
574    if (svc) {
575        service_stop(svc);
576    }
577    return 0;
578}
579
580int do_restart(int nargs, char **args)
581{
582    struct service *svc;
583    svc = service_find_by_name(args[1]);
584    if (svc) {
585        service_stop(svc);
586        service_start(svc, NULL);
587    }
588    return 0;
589}
590
591int do_trigger(int nargs, char **args)
592{
593    action_for_each_trigger(args[1], action_add_queue_tail);
594    return 0;
595}
596
597int do_symlink(int nargs, char **args)
598{
599    return symlink(args[1], args[2]);
600}
601
602int do_rm(int nargs, char **args)
603{
604    return unlink(args[1]);
605}
606
607int do_rmdir(int nargs, char **args)
608{
609    return rmdir(args[1]);
610}
611
612int do_sysclktz(int nargs, char **args)
613{
614    struct timezone tz;
615
616    if (nargs != 2)
617        return -1;
618
619    memset(&tz, 0, sizeof(tz));
620    tz.tz_minuteswest = atoi(args[1]);
621    if (settimeofday(NULL, &tz))
622        return -1;
623    return 0;
624}
625
626int do_write(int nargs, char **args)
627{
628    const char *path = args[1];
629    const char *value = args[2];
630    char prop_val[PROP_VALUE_MAX];
631    int ret;
632
633    ret = expand_props(prop_val, value, sizeof(prop_val));
634    if (ret) {
635        ERROR("cannot expand '%s' while writing to '%s'\n", value, path);
636        return -EINVAL;
637    }
638    return write_file(path, prop_val);
639}
640
641int do_copy(int nargs, char **args)
642{
643    char *buffer = NULL;
644    int rc = 0;
645    int fd1 = -1, fd2 = -1;
646    struct stat info;
647    int brtw, brtr;
648    char *p;
649
650    if (nargs != 3)
651        return -1;
652
653    if (stat(args[1], &info) < 0)
654        return -1;
655
656    if ((fd1 = open(args[1], O_RDONLY)) < 0)
657        goto out_err;
658
659    if ((fd2 = open(args[2], O_WRONLY|O_CREAT|O_TRUNC, 0660)) < 0)
660        goto out_err;
661
662    if (!(buffer = malloc(info.st_size)))
663        goto out_err;
664
665    p = buffer;
666    brtr = info.st_size;
667    while(brtr) {
668        rc = read(fd1, p, brtr);
669        if (rc < 0)
670            goto out_err;
671        if (rc == 0)
672            break;
673        p += rc;
674        brtr -= rc;
675    }
676
677    p = buffer;
678    brtw = info.st_size;
679    while(brtw) {
680        rc = write(fd2, p, brtw);
681        if (rc < 0)
682            goto out_err;
683        if (rc == 0)
684            break;
685        p += rc;
686        brtw -= rc;
687    }
688
689    rc = 0;
690    goto out;
691out_err:
692    rc = -1;
693out:
694    if (buffer)
695        free(buffer);
696    if (fd1 >= 0)
697        close(fd1);
698    if (fd2 >= 0)
699        close(fd2);
700    return rc;
701}
702
703int do_chown(int nargs, char **args) {
704    /* GID is optional. */
705    if (nargs == 3) {
706        if (_chown(args[2], decode_uid(args[1]), -1) < 0)
707            return -errno;
708    } else if (nargs == 4) {
709        if (_chown(args[3], decode_uid(args[1]), decode_uid(args[2])) < 0)
710            return -errno;
711    } else {
712        return -1;
713    }
714    return 0;
715}
716
717static mode_t get_mode(const char *s) {
718    mode_t mode = 0;
719    while (*s) {
720        if (*s >= '0' && *s <= '7') {
721            mode = (mode<<3) | (*s-'0');
722        } else {
723            return -1;
724        }
725        s++;
726    }
727    return mode;
728}
729
730int do_chmod(int nargs, char **args) {
731    mode_t mode = get_mode(args[1]);
732    if (_chmod(args[2], mode) < 0) {
733        return -errno;
734    }
735    return 0;
736}
737
738int do_restorecon(int nargs, char **args) {
739    int i;
740
741    for (i = 1; i < nargs; i++) {
742        if (restorecon(args[i]) < 0)
743            return -errno;
744    }
745    return 0;
746}
747
748int do_setsebool(int nargs, char **args) {
749#ifdef HAVE_SELINUX
750    SELboolean *b = alloca(nargs * sizeof(SELboolean));
751    char *v;
752    int i;
753
754    if (is_selinux_enabled() <= 0)
755        return 0;
756
757    for (i = 1; i < nargs; i++) {
758        char *name = args[i];
759        v = strchr(name, '=');
760        if (!v) {
761            ERROR("setsebool: argument %s had no =\n", name);
762            return -EINVAL;
763        }
764        *v++ = 0;
765        b[i-1].name = name;
766        if (!strcmp(v, "1") || !strcasecmp(v, "true") || !strcasecmp(v, "on"))
767            b[i-1].value = 1;
768        else if (!strcmp(v, "0") || !strcasecmp(v, "false") || !strcasecmp(v, "off"))
769            b[i-1].value = 0;
770        else {
771            ERROR("setsebool: invalid value %s\n", v);
772            return -EINVAL;
773        }
774    }
775
776    if (security_set_boolean_list(nargs - 1, b, 0) < 0)
777        return -errno;
778#endif
779    return 0;
780}
781
782int do_loglevel(int nargs, char **args) {
783    if (nargs == 2) {
784        klog_set_level(atoi(args[1]));
785        return 0;
786    }
787    return -1;
788}
789
790int do_load_persist_props(int nargs, char **args) {
791    if (nargs == 1) {
792        load_persist_props();
793        return 0;
794    }
795    return -1;
796}
797
798int do_wait(int nargs, char **args)
799{
800    if (nargs == 2) {
801        return wait_for_file(args[1], COMMAND_RETRY_TIMEOUT);
802    } else if (nargs == 3) {
803        return wait_for_file(args[1], atoi(args[2]));
804    } else
805        return -1;
806}
807