builtins.c revision 381341f5f72a46b34126e5c8e6f62f04b702ba47 
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 <cutils/android_reboot.h>
36#include <fs_mgr.h>
37
38#include <selinux/selinux.h>
39#include <selinux/label.h>
40
41#include "init.h"
42#include "keywords.h"
43#include "property_service.h"
44#include "devices.h"
45#include "init_parser.h"
46#include "util.h"
47#include "log.h"
48
49#include <private/android_filesystem_config.h>
50
51int add_environment(const char *name, const char *value);
52
53extern int init_module(void *, unsigned long, const char *);
54
55static int write_file(const char *path, const char *value)
56{
57    int fd, ret, len;
58
59    fd = open(path, O_WRONLY|O_CREAT|O_NOFOLLOW, 0600);
60
61    if (fd < 0)
62        return -errno;
63
64    len = strlen(value);
65
66    do {
67        ret = write(fd, value, len);
68    } while (ret < 0 && errno == EINTR);
69
70    close(fd);
71    if (ret < 0) {
72        return -errno;
73    } else {
74        return 0;
75    }
76}
77
78static int _open(const char *path)
79{
80    int fd;
81
82    fd = open(path, O_RDONLY | O_NOFOLLOW);
83    if (fd < 0)
84        fd = open(path, O_WRONLY | O_NOFOLLOW);
85
86    return fd;
87}
88
89static int _chown(const char *path, unsigned int uid, unsigned int gid)
90{
91    int fd;
92    int ret;
93
94    fd = _open(path);
95    if (fd < 0) {
96        return -1;
97    }
98
99    ret = fchown(fd, uid, gid);
100    if (ret < 0) {
101        int errno_copy = errno;
102        close(fd);
103        errno = errno_copy;
104        return -1;
105    }
106
107    close(fd);
108
109    return 0;
110}
111
112static int _chmod(const char *path, mode_t mode)
113{
114    int fd;
115    int ret;
116
117    fd = _open(path);
118    if (fd < 0) {
119        return -1;
120    }
121
122    ret = fchmod(fd, mode);
123    if (ret < 0) {
124        int errno_copy = errno;
125        close(fd);
126        errno = errno_copy;
127        return -1;
128    }
129
130    close(fd);
131
132    return 0;
133}
134
135static int insmod(const char *filename, char *options)
136{
137    void *module;
138    unsigned size;
139    int ret;
140
141    module = read_file(filename, &size);
142    if (!module)
143        return -1;
144
145    ret = init_module(module, size, options);
146
147    free(module);
148
149    return ret;
150}
151
152static int setkey(struct kbentry *kbe)
153{
154    int fd, ret;
155
156    fd = open("/dev/tty0", O_RDWR | O_SYNC);
157    if (fd < 0)
158        return -1;
159
160    ret = ioctl(fd, KDSKBENT, kbe);
161
162    close(fd);
163    return ret;
164}
165
166static int __ifupdown(const char *interface, int up)
167{
168    struct ifreq ifr;
169    int s, ret;
170
171    strlcpy(ifr.ifr_name, interface, IFNAMSIZ);
172
173    s = socket(AF_INET, SOCK_DGRAM, 0);
174    if (s < 0)
175        return -1;
176
177    ret = ioctl(s, SIOCGIFFLAGS, &ifr);
178    if (ret < 0) {
179        goto done;
180    }
181
182    if (up)
183        ifr.ifr_flags |= IFF_UP;
184    else
185        ifr.ifr_flags &= ~IFF_UP;
186
187    ret = ioctl(s, SIOCSIFFLAGS, &ifr);
188
189done:
190    close(s);
191    return ret;
192}
193
194static void service_start_if_not_disabled(struct service *svc)
195{
196    if (!(svc->flags & SVC_DISABLED)) {
197        service_start(svc, NULL);
198    } else {
199        svc->flags |= SVC_DISABLED_START;
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_enable(int nargs, char **args)
243{
244    struct service *svc;
245    svc = service_find_by_name(args[1]);
246    if (svc) {
247        svc->flags &= ~(SVC_DISABLED | SVC_RC_DISABLED);
248        if (svc->flags & SVC_DISABLED_START) {
249            service_start(svc, NULL);
250        }
251    } else {
252        return -1;
253    }
254    return 0;
255}
256
257int do_exec(int nargs, char **args)
258{
259    return -1;
260}
261
262int do_export(int nargs, char **args)
263{
264    return add_environment(args[1], args[2]);
265}
266
267int do_hostname(int nargs, char **args)
268{
269    return write_file("/proc/sys/kernel/hostname", args[1]);
270}
271
272int do_ifup(int nargs, char **args)
273{
274    return __ifupdown(args[1], 1);
275}
276
277
278static int do_insmod_inner(int nargs, char **args, int opt_len)
279{
280    char options[opt_len + 1];
281    int i;
282
283    options[0] = '\0';
284    if (nargs > 2) {
285        strcpy(options, args[2]);
286        for (i = 3; i < nargs; ++i) {
287            strcat(options, " ");
288            strcat(options, args[i]);
289        }
290    }
291
292    return insmod(args[1], options);
293}
294
295int do_insmod(int nargs, char **args)
296{
297    int i;
298    int size = 0;
299
300    if (nargs > 2) {
301        for (i = 2; i < nargs; ++i)
302            size += strlen(args[i]) + 1;
303    }
304
305    return do_insmod_inner(nargs, args, size);
306}
307
308int do_mkdir(int nargs, char **args)
309{
310    mode_t mode = 0755;
311    int ret;
312
313    /* mkdir <path> [mode] [owner] [group] */
314
315    if (nargs >= 3) {
316        mode = strtoul(args[2], 0, 8);
317    }
318
319    ret = make_dir(args[1], mode);
320    /* chmod in case the directory already exists */
321    if (ret == -1 && errno == EEXIST) {
322        ret = _chmod(args[1], mode);
323    }
324    if (ret == -1) {
325        return -errno;
326    }
327
328    if (nargs >= 4) {
329        uid_t uid = decode_uid(args[3]);
330        gid_t gid = -1;
331
332        if (nargs == 5) {
333            gid = decode_uid(args[4]);
334        }
335
336        if (_chown(args[1], uid, gid) < 0) {
337            return -errno;
338        }
339
340        /* chown may have cleared S_ISUID and S_ISGID, chmod again */
341        if (mode & (S_ISUID | S_ISGID)) {
342            ret = _chmod(args[1], mode);
343            if (ret == -1) {
344                return -errno;
345            }
346        }
347    }
348
349    return 0;
350}
351
352static struct {
353    const char *name;
354    unsigned flag;
355} mount_flags[] = {
356    { "noatime",    MS_NOATIME },
357    { "noexec",     MS_NOEXEC },
358    { "nosuid",     MS_NOSUID },
359    { "nodev",      MS_NODEV },
360    { "nodiratime", MS_NODIRATIME },
361    { "ro",         MS_RDONLY },
362    { "rw",         0 },
363    { "remount",    MS_REMOUNT },
364    { "bind",       MS_BIND },
365    { "rec",        MS_REC },
366    { "unbindable", MS_UNBINDABLE },
367    { "private",    MS_PRIVATE },
368    { "slave",      MS_SLAVE },
369    { "shared",     MS_SHARED },
370    { "defaults",   0 },
371    { 0,            0 },
372};
373
374#define DATA_MNT_POINT "/data"
375
376/* mount <type> <device> <path> <flags ...> <options> */
377int do_mount(int nargs, char **args)
378{
379    char tmp[64];
380    char *source, *target, *system;
381    char *options = NULL;
382    unsigned flags = 0;
383    int n, i;
384    int wait = 0;
385
386    for (n = 4; n < nargs; n++) {
387        for (i = 0; mount_flags[i].name; i++) {
388            if (!strcmp(args[n], mount_flags[i].name)) {
389                flags |= mount_flags[i].flag;
390                break;
391            }
392        }
393
394        if (!mount_flags[i].name) {
395            if (!strcmp(args[n], "wait"))
396                wait = 1;
397            /* if our last argument isn't a flag, wolf it up as an option string */
398            else if (n + 1 == nargs)
399                options = args[n];
400        }
401    }
402
403    system = args[1];
404    source = args[2];
405    target = args[3];
406
407    if (!strncmp(source, "mtd@", 4)) {
408        n = mtd_name_to_number(source + 4);
409        if (n < 0) {
410            return -1;
411        }
412
413        sprintf(tmp, "/dev/block/mtdblock%d", n);
414
415        if (wait)
416            wait_for_file(tmp, COMMAND_RETRY_TIMEOUT);
417        if (mount(tmp, target, system, flags, options) < 0) {
418            return -1;
419        }
420
421        goto exit_success;
422    } else if (!strncmp(source, "loop@", 5)) {
423        int mode, loop, fd;
424        struct loop_info info;
425
426        mode = (flags & MS_RDONLY) ? O_RDONLY : O_RDWR;
427        fd = open(source + 5, mode);
428        if (fd < 0) {
429            return -1;
430        }
431
432        for (n = 0; ; n++) {
433            sprintf(tmp, "/dev/block/loop%d", n);
434            loop = open(tmp, mode);
435            if (loop < 0) {
436                return -1;
437            }
438
439            /* if it is a blank loop device */
440            if (ioctl(loop, LOOP_GET_STATUS, &info) < 0 && errno == ENXIO) {
441                /* if it becomes our loop device */
442                if (ioctl(loop, LOOP_SET_FD, fd) >= 0) {
443                    close(fd);
444
445                    if (mount(tmp, target, system, flags, options) < 0) {
446                        ioctl(loop, LOOP_CLR_FD, 0);
447                        close(loop);
448                        return -1;
449                    }
450
451                    close(loop);
452                    goto exit_success;
453                }
454            }
455
456            close(loop);
457        }
458
459        close(fd);
460        ERROR("out of loopback devices");
461        return -1;
462    } else {
463        if (wait)
464            wait_for_file(source, COMMAND_RETRY_TIMEOUT);
465        if (mount(source, target, system, flags, options) < 0) {
466            return -1;
467        }
468
469    }
470
471exit_success:
472    return 0;
473
474}
475
476int do_mount_all(int nargs, char **args)
477{
478    pid_t pid;
479    int ret = -1;
480    int child_ret = -1;
481    int status;
482    const char *prop;
483    struct fstab *fstab;
484
485    if (nargs != 2) {
486        return -1;
487    }
488
489    /*
490     * Call fs_mgr_mount_all() to mount all filesystems.  We fork(2) and
491     * do the call in the child to provide protection to the main init
492     * process if anything goes wrong (crash or memory leak), and wait for
493     * the child to finish in the parent.
494     */
495    pid = fork();
496    if (pid > 0) {
497        /* Parent.  Wait for the child to return */
498        waitpid(pid, &status, 0);
499        if (WIFEXITED(status)) {
500            ret = WEXITSTATUS(status);
501        } else {
502            ret = -1;
503        }
504    } else if (pid == 0) {
505        /* child, call fs_mgr_mount_all() */
506        klog_set_level(6);  /* So we can see what fs_mgr_mount_all() does */
507        fstab = fs_mgr_read_fstab(args[1]);
508        child_ret = fs_mgr_mount_all(fstab);
509        fs_mgr_free_fstab(fstab);
510        if (child_ret == -1) {
511            ERROR("fs_mgr_mount_all returned an error\n");
512        }
513        exit(child_ret);
514    } else {
515        /* fork failed, return an error */
516        return -1;
517    }
518
519    /* ret is 1 if the device is encrypted, 0 if not, and -1 on error */
520    if (ret == 1) {
521        property_set("ro.crypto.state", "encrypted");
522        property_set("vold.decrypt", "1");
523    } else if (ret == 0) {
524        property_set("ro.crypto.state", "unencrypted");
525        /* If fs_mgr determined this is an unencrypted device, then trigger
526         * that action.
527         */
528        action_for_each_trigger("nonencrypted", action_add_queue_tail);
529    }
530
531    return ret;
532}
533
534int do_swapon_all(int nargs, char **args)
535{
536    struct fstab *fstab;
537    int ret;
538
539    fstab = fs_mgr_read_fstab(args[1]);
540    ret = fs_mgr_swapon_all(fstab);
541    fs_mgr_free_fstab(fstab);
542
543    return ret;
544}
545
546int do_setcon(int nargs, char **args) {
547    if (is_selinux_enabled() <= 0)
548        return 0;
549    if (setcon(args[1]) < 0) {
550        return -errno;
551    }
552    return 0;
553}
554
555int do_setenforce(int nargs, char **args) {
556    if (is_selinux_enabled() <= 0)
557        return 0;
558    if (security_setenforce(atoi(args[1])) < 0) {
559        return -errno;
560    }
561    return 0;
562}
563
564int do_setkey(int nargs, char **args)
565{
566    struct kbentry kbe;
567    kbe.kb_table = strtoul(args[1], 0, 0);
568    kbe.kb_index = strtoul(args[2], 0, 0);
569    kbe.kb_value = strtoul(args[3], 0, 0);
570    return setkey(&kbe);
571}
572
573int do_setprop(int nargs, char **args)
574{
575    const char *name = args[1];
576    const char *value = args[2];
577    char prop_val[PROP_VALUE_MAX];
578    int ret;
579
580    ret = expand_props(prop_val, value, sizeof(prop_val));
581    if (ret) {
582        ERROR("cannot expand '%s' while assigning to '%s'\n", value, name);
583        return -EINVAL;
584    }
585    property_set(name, prop_val);
586    return 0;
587}
588
589int do_setrlimit(int nargs, char **args)
590{
591    struct rlimit limit;
592    int resource;
593    resource = atoi(args[1]);
594    limit.rlim_cur = atoi(args[2]);
595    limit.rlim_max = atoi(args[3]);
596    return setrlimit(resource, &limit);
597}
598
599int do_start(int nargs, char **args)
600{
601    struct service *svc;
602    svc = service_find_by_name(args[1]);
603    if (svc) {
604        service_start(svc, NULL);
605    }
606    return 0;
607}
608
609int do_stop(int nargs, char **args)
610{
611    struct service *svc;
612    svc = service_find_by_name(args[1]);
613    if (svc) {
614        service_stop(svc);
615    }
616    return 0;
617}
618
619int do_restart(int nargs, char **args)
620{
621    struct service *svc;
622    svc = service_find_by_name(args[1]);
623    if (svc) {
624        service_restart(svc);
625    }
626    return 0;
627}
628
629int do_powerctl(int nargs, char **args)
630{
631    char command[PROP_VALUE_MAX];
632    int res;
633    int len = 0;
634    int cmd = 0;
635    char *reboot_target;
636
637    res = expand_props(command, args[1], sizeof(command));
638    if (res) {
639        ERROR("powerctl: cannot expand '%s'\n", args[1]);
640        return -EINVAL;
641    }
642
643    if (strncmp(command, "shutdown", 8) == 0) {
644        cmd = ANDROID_RB_POWEROFF;
645        len = 8;
646    } else if (strncmp(command, "reboot", 6) == 0) {
647        cmd = ANDROID_RB_RESTART2;
648        len = 6;
649    } else {
650        ERROR("powerctl: unrecognized command '%s'\n", command);
651        return -EINVAL;
652    }
653
654    if (command[len] == ',') {
655        reboot_target = &command[len + 1];
656    } else if (command[len] == '\0') {
657        reboot_target = "";
658    } else {
659        ERROR("powerctl: unrecognized reboot target '%s'\n", &command[len]);
660        return -EINVAL;
661    }
662
663    return android_reboot(cmd, 0, reboot_target);
664}
665
666int do_trigger(int nargs, char **args)
667{
668    action_for_each_trigger(args[1], action_add_queue_tail);
669    return 0;
670}
671
672int do_symlink(int nargs, char **args)
673{
674    return symlink(args[1], args[2]);
675}
676
677int do_rm(int nargs, char **args)
678{
679    return unlink(args[1]);
680}
681
682int do_rmdir(int nargs, char **args)
683{
684    return rmdir(args[1]);
685}
686
687int do_sysclktz(int nargs, char **args)
688{
689    struct timezone tz;
690
691    if (nargs != 2)
692        return -1;
693
694    memset(&tz, 0, sizeof(tz));
695    tz.tz_minuteswest = atoi(args[1]);
696    if (settimeofday(NULL, &tz))
697        return -1;
698    return 0;
699}
700
701int do_write(int nargs, char **args)
702{
703    const char *path = args[1];
704    const char *value = args[2];
705    char prop_val[PROP_VALUE_MAX];
706    int ret;
707
708    ret = expand_props(prop_val, value, sizeof(prop_val));
709    if (ret) {
710        ERROR("cannot expand '%s' while writing to '%s'\n", value, path);
711        return -EINVAL;
712    }
713    return write_file(path, prop_val);
714}
715
716int do_copy(int nargs, char **args)
717{
718    char *buffer = NULL;
719    int rc = 0;
720    int fd1 = -1, fd2 = -1;
721    struct stat info;
722    int brtw, brtr;
723    char *p;
724
725    if (nargs != 3)
726        return -1;
727
728    if (stat(args[1], &info) < 0)
729        return -1;
730
731    if ((fd1 = open(args[1], O_RDONLY)) < 0)
732        goto out_err;
733
734    if ((fd2 = open(args[2], O_WRONLY|O_CREAT|O_TRUNC, 0660)) < 0)
735        goto out_err;
736
737    if (!(buffer = malloc(info.st_size)))
738        goto out_err;
739
740    p = buffer;
741    brtr = info.st_size;
742    while(brtr) {
743        rc = read(fd1, p, brtr);
744        if (rc < 0)
745            goto out_err;
746        if (rc == 0)
747            break;
748        p += rc;
749        brtr -= rc;
750    }
751
752    p = buffer;
753    brtw = info.st_size;
754    while(brtw) {
755        rc = write(fd2, p, brtw);
756        if (rc < 0)
757            goto out_err;
758        if (rc == 0)
759            break;
760        p += rc;
761        brtw -= rc;
762    }
763
764    rc = 0;
765    goto out;
766out_err:
767    rc = -1;
768out:
769    if (buffer)
770        free(buffer);
771    if (fd1 >= 0)
772        close(fd1);
773    if (fd2 >= 0)
774        close(fd2);
775    return rc;
776}
777
778int do_chown(int nargs, char **args) {
779    /* GID is optional. */
780    if (nargs == 3) {
781        if (_chown(args[2], decode_uid(args[1]), -1) < 0)
782            return -errno;
783    } else if (nargs == 4) {
784        if (_chown(args[3], decode_uid(args[1]), decode_uid(args[2])) < 0)
785            return -errno;
786    } else {
787        return -1;
788    }
789    return 0;
790}
791
792static mode_t get_mode(const char *s) {
793    mode_t mode = 0;
794    while (*s) {
795        if (*s >= '0' && *s <= '7') {
796            mode = (mode<<3) | (*s-'0');
797        } else {
798            return -1;
799        }
800        s++;
801    }
802    return mode;
803}
804
805int do_chmod(int nargs, char **args) {
806    mode_t mode = get_mode(args[1]);
807    if (_chmod(args[2], mode) < 0) {
808        return -errno;
809    }
810    return 0;
811}
812
813int do_restorecon(int nargs, char **args) {
814    int i;
815    int ret = 0;
816
817    for (i = 1; i < nargs; i++) {
818        if (restorecon(args[i]) < 0)
819            ret = -errno;
820    }
821    return ret;
822}
823
824int do_restorecon_recursive(int nargs, char **args) {
825    int i;
826    int ret = 0;
827
828    for (i = 1; i < nargs; i++) {
829        if (restorecon_recursive(args[i]) < 0)
830            ret = -errno;
831    }
832    return ret;
833}
834
835int do_setsebool(int nargs, char **args) {
836    const char *name = args[1];
837    const char *value = args[2];
838    SELboolean b;
839    int ret;
840
841    if (is_selinux_enabled() <= 0)
842        return 0;
843
844    b.name = name;
845    if (!strcmp(value, "1") || !strcasecmp(value, "true") || !strcasecmp(value, "on"))
846        b.value = 1;
847    else if (!strcmp(value, "0") || !strcasecmp(value, "false") || !strcasecmp(value, "off"))
848        b.value = 0;
849    else {
850        ERROR("setsebool: invalid value %s\n", value);
851        return -EINVAL;
852    }
853
854    if (security_set_boolean_list(1, &b, 0) < 0) {
855        ret = -errno;
856        ERROR("setsebool: could not set %s to %s\n", name, value);
857        return ret;
858    }
859
860    return 0;
861}
862
863int do_loglevel(int nargs, char **args) {
864    int log_level;
865    char log_level_str[PROP_VALUE_MAX] = "";
866    if (nargs != 2) {
867        ERROR("loglevel: missing argument\n");
868        return -EINVAL;
869    }
870
871    if (expand_props(log_level_str, args[1], sizeof(log_level_str))) {
872        ERROR("loglevel: cannot expand '%s'\n", args[1]);
873        return -EINVAL;
874    }
875    log_level = atoi(log_level_str);
876    if (log_level < KLOG_ERROR_LEVEL || log_level > KLOG_DEBUG_LEVEL) {
877        ERROR("loglevel: invalid log level'%d'\n", log_level);
878        return -EINVAL;
879    }
880    klog_set_level(log_level);
881    return 0;
882}
883
884int do_load_persist_props(int nargs, char **args) {
885    if (nargs == 1) {
886        load_persist_props();
887        return 0;
888    }
889    return -1;
890}
891
892int do_load_all_props(int nargs, char **args) {
893    if (nargs == 1) {
894        load_all_props();
895        return 0;
896    }
897    return -1;
898}
899
900int do_wait(int nargs, char **args)
901{
902    if (nargs == 2) {
903        return wait_for_file(args[1], COMMAND_RETRY_TIMEOUT);
904    } else if (nargs == 3) {
905        return wait_for_file(args[1], atoi(args[2]));
906    } else
907        return -1;
908}
909