builtins.c revision 0e9dd90ac336278659477cad0b9e9f1004e2b338 
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 = mkdir(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    { "nosuid",     MS_NOSUID },
336    { "nodev",      MS_NODEV },
337    { "nodiratime", MS_NODIRATIME },
338    { "ro",         MS_RDONLY },
339    { "rw",         0 },
340    { "remount",    MS_REMOUNT },
341    { "defaults",   0 },
342    { 0,            0 },
343};
344
345#define DATA_MNT_POINT "/data"
346
347/* mount <type> <device> <path> <flags ...> <options> */
348int do_mount(int nargs, char **args)
349{
350    char tmp[64];
351    char *source, *target, *system;
352    char *options = NULL;
353    unsigned flags = 0;
354    int n, i;
355    int wait = 0;
356
357    for (n = 4; n < nargs; n++) {
358        for (i = 0; mount_flags[i].name; i++) {
359            if (!strcmp(args[n], mount_flags[i].name)) {
360                flags |= mount_flags[i].flag;
361                break;
362            }
363        }
364
365        if (!mount_flags[i].name) {
366            if (!strcmp(args[n], "wait"))
367                wait = 1;
368            /* if our last argument isn't a flag, wolf it up as an option string */
369            else if (n + 1 == nargs)
370                options = args[n];
371        }
372    }
373
374    system = args[1];
375    source = args[2];
376    target = args[3];
377
378    if (!strncmp(source, "mtd@", 4)) {
379        n = mtd_name_to_number(source + 4);
380        if (n < 0) {
381            return -1;
382        }
383
384        sprintf(tmp, "/dev/block/mtdblock%d", n);
385
386        if (wait)
387            wait_for_file(tmp, COMMAND_RETRY_TIMEOUT);
388        if (mount(tmp, target, system, flags, options) < 0) {
389            return -1;
390        }
391
392        goto exit_success;
393    } else if (!strncmp(source, "loop@", 5)) {
394        int mode, loop, fd;
395        struct loop_info info;
396
397        mode = (flags & MS_RDONLY) ? O_RDONLY : O_RDWR;
398        fd = open(source + 5, mode);
399        if (fd < 0) {
400            return -1;
401        }
402
403        for (n = 0; ; n++) {
404            sprintf(tmp, "/dev/block/loop%d", n);
405            loop = open(tmp, mode);
406            if (loop < 0) {
407                return -1;
408            }
409
410            /* if it is a blank loop device */
411            if (ioctl(loop, LOOP_GET_STATUS, &info) < 0 && errno == ENXIO) {
412                /* if it becomes our loop device */
413                if (ioctl(loop, LOOP_SET_FD, fd) >= 0) {
414                    close(fd);
415
416                    if (mount(tmp, target, system, flags, options) < 0) {
417                        ioctl(loop, LOOP_CLR_FD, 0);
418                        close(loop);
419                        return -1;
420                    }
421
422                    close(loop);
423                    goto exit_success;
424                }
425            }
426
427            close(loop);
428        }
429
430        close(fd);
431        ERROR("out of loopback devices");
432        return -1;
433    } else {
434        if (wait)
435            wait_for_file(source, COMMAND_RETRY_TIMEOUT);
436        if (mount(source, target, system, flags, options) < 0) {
437            return -1;
438        }
439
440    }
441
442exit_success:
443    return 0;
444
445}
446
447int do_mount_all(int nargs, char **args)
448{
449    pid_t pid;
450    int ret = -1;
451    int child_ret = -1;
452    int status;
453    const char *prop;
454
455    if (nargs != 2) {
456        return -1;
457    }
458
459    /*
460     * Call fs_mgr_mount_all() to mount all filesystems.  We fork(2) and
461     * do the call in the child to provide protection to the main init
462     * process if anything goes wrong (crash or memory leak), and wait for
463     * the child to finish in the parent.
464     */
465    pid = fork();
466    if (pid > 0) {
467        /* Parent.  Wait for the child to return */
468        waitpid(pid, &status, 0);
469        if (WIFEXITED(status)) {
470            ret = WEXITSTATUS(status);
471        } else {
472            ret = -1;
473        }
474    } else if (pid == 0) {
475        /* child, call fs_mgr_mount_all() */
476        klog_set_level(6);  /* So we can see what fs_mgr_mount_all() does */
477        child_ret = fs_mgr_mount_all(args[1]);
478        if (child_ret == -1) {
479            ERROR("fs_mgr_mount_all returned an error\n");
480        }
481        exit(child_ret);
482    } else {
483        /* fork failed, return an error */
484        return -1;
485    }
486
487    /* ret is 1 if the device is encrypted, 0 if not, and -1 on error */
488    if (ret == 1) {
489        property_set("ro.crypto.state", "encrypted");
490        property_set("vold.decrypt", "1");
491    } else if (ret == 0) {
492        property_set("ro.crypto.state", "unencrypted");
493        /* If fs_mgr determined this is an unencrypted device, then trigger
494         * that action.
495         */
496        action_for_each_trigger("nonencrypted", action_add_queue_tail);
497    }
498
499    return ret;
500}
501
502int do_setcon(int nargs, char **args) {
503#ifdef HAVE_SELINUX
504    if (is_selinux_enabled() <= 0)
505        return 0;
506    if (setcon(args[1]) < 0) {
507        return -errno;
508    }
509#endif
510    return 0;
511}
512
513int do_setenforce(int nargs, char **args) {
514#ifdef HAVE_SELINUX
515    if (is_selinux_enabled() <= 0)
516        return 0;
517    if (security_setenforce(atoi(args[1])) < 0) {
518        return -errno;
519    }
520#endif
521    return 0;
522}
523
524int do_setkey(int nargs, char **args)
525{
526    struct kbentry kbe;
527    kbe.kb_table = strtoul(args[1], 0, 0);
528    kbe.kb_index = strtoul(args[2], 0, 0);
529    kbe.kb_value = strtoul(args[3], 0, 0);
530    return setkey(&kbe);
531}
532
533int do_setprop(int nargs, char **args)
534{
535    const char *name = args[1];
536    const char *value = args[2];
537    char prop_val[PROP_VALUE_MAX];
538    int ret;
539
540    ret = expand_props(prop_val, value, sizeof(prop_val));
541    if (ret) {
542        ERROR("cannot expand '%s' while assigning to '%s'\n", value, name);
543        return -EINVAL;
544    }
545    property_set(name, prop_val);
546    return 0;
547}
548
549int do_setrlimit(int nargs, char **args)
550{
551    struct rlimit limit;
552    int resource;
553    resource = atoi(args[1]);
554    limit.rlim_cur = atoi(args[2]);
555    limit.rlim_max = atoi(args[3]);
556    return setrlimit(resource, &limit);
557}
558
559int do_start(int nargs, char **args)
560{
561    struct service *svc;
562    svc = service_find_by_name(args[1]);
563    if (svc) {
564        service_start(svc, NULL);
565    }
566    return 0;
567}
568
569int do_stop(int nargs, char **args)
570{
571    struct service *svc;
572    svc = service_find_by_name(args[1]);
573    if (svc) {
574        service_stop(svc);
575    }
576    return 0;
577}
578
579int do_restart(int nargs, char **args)
580{
581    struct service *svc;
582    svc = service_find_by_name(args[1]);
583    if (svc) {
584        service_stop(svc);
585        service_start(svc, NULL);
586    }
587    return 0;
588}
589
590int do_trigger(int nargs, char **args)
591{
592    action_for_each_trigger(args[1], action_add_queue_tail);
593    return 0;
594}
595
596int do_symlink(int nargs, char **args)
597{
598    return symlink(args[1], args[2]);
599}
600
601int do_rm(int nargs, char **args)
602{
603    return unlink(args[1]);
604}
605
606int do_rmdir(int nargs, char **args)
607{
608    return rmdir(args[1]);
609}
610
611int do_sysclktz(int nargs, char **args)
612{
613    struct timezone tz;
614
615    if (nargs != 2)
616        return -1;
617
618    memset(&tz, 0, sizeof(tz));
619    tz.tz_minuteswest = atoi(args[1]);
620    if (settimeofday(NULL, &tz))
621        return -1;
622    return 0;
623}
624
625int do_write(int nargs, char **args)
626{
627    const char *path = args[1];
628    const char *value = args[2];
629    char prop_val[PROP_VALUE_MAX];
630    int ret;
631
632    ret = expand_props(prop_val, value, sizeof(prop_val));
633    if (ret) {
634        ERROR("cannot expand '%s' while writing to '%s'\n", value, path);
635        return -EINVAL;
636    }
637    return write_file(path, prop_val);
638}
639
640int do_copy(int nargs, char **args)
641{
642    char *buffer = NULL;
643    int rc = 0;
644    int fd1 = -1, fd2 = -1;
645    struct stat info;
646    int brtw, brtr;
647    char *p;
648
649    if (nargs != 3)
650        return -1;
651
652    if (stat(args[1], &info) < 0)
653        return -1;
654
655    if ((fd1 = open(args[1], O_RDONLY)) < 0)
656        goto out_err;
657
658    if ((fd2 = open(args[2], O_WRONLY|O_CREAT|O_TRUNC, 0660)) < 0)
659        goto out_err;
660
661    if (!(buffer = malloc(info.st_size)))
662        goto out_err;
663
664    p = buffer;
665    brtr = info.st_size;
666    while(brtr) {
667        rc = read(fd1, p, brtr);
668        if (rc < 0)
669            goto out_err;
670        if (rc == 0)
671            break;
672        p += rc;
673        brtr -= rc;
674    }
675
676    p = buffer;
677    brtw = info.st_size;
678    while(brtw) {
679        rc = write(fd2, p, brtw);
680        if (rc < 0)
681            goto out_err;
682        if (rc == 0)
683            break;
684        p += rc;
685        brtw -= rc;
686    }
687
688    rc = 0;
689    goto out;
690out_err:
691    rc = -1;
692out:
693    if (buffer)
694        free(buffer);
695    if (fd1 >= 0)
696        close(fd1);
697    if (fd2 >= 0)
698        close(fd2);
699    return rc;
700}
701
702int do_chown(int nargs, char **args) {
703    /* GID is optional. */
704    if (nargs == 3) {
705        if (_chown(args[2], decode_uid(args[1]), -1) < 0)
706            return -errno;
707    } else if (nargs == 4) {
708        if (_chown(args[3], decode_uid(args[1]), decode_uid(args[2])) < 0)
709            return -errno;
710    } else {
711        return -1;
712    }
713    return 0;
714}
715
716static mode_t get_mode(const char *s) {
717    mode_t mode = 0;
718    while (*s) {
719        if (*s >= '0' && *s <= '7') {
720            mode = (mode<<3) | (*s-'0');
721        } else {
722            return -1;
723        }
724        s++;
725    }
726    return mode;
727}
728
729int do_chmod(int nargs, char **args) {
730    mode_t mode = get_mode(args[1]);
731    if (_chmod(args[2], mode) < 0) {
732        return -errno;
733    }
734    return 0;
735}
736
737int do_restorecon(int nargs, char **args) {
738#ifdef HAVE_SELINUX
739    char *secontext = NULL;
740    struct stat sb;
741    int i;
742
743    if (is_selinux_enabled() <= 0 || !sehandle)
744        return 0;
745
746    for (i = 1; i < nargs; i++) {
747        if (lstat(args[i], &sb) < 0)
748            return -errno;
749        if (selabel_lookup(sehandle, &secontext, args[i], sb.st_mode) < 0)
750            return -errno;
751        if (lsetfilecon(args[i], secontext) < 0) {
752            freecon(secontext);
753            return -errno;
754        }
755        freecon(secontext);
756    }
757#endif
758    return 0;
759}
760
761int do_setsebool(int nargs, char **args) {
762#ifdef HAVE_SELINUX
763    SELboolean *b = alloca(nargs * sizeof(SELboolean));
764    char *v;
765    int i;
766
767    if (is_selinux_enabled() <= 0)
768        return 0;
769
770    for (i = 1; i < nargs; i++) {
771        char *name = args[i];
772        v = strchr(name, '=');
773        if (!v) {
774            ERROR("setsebool: argument %s had no =\n", name);
775            return -EINVAL;
776        }
777        *v++ = 0;
778        b[i-1].name = name;
779        if (!strcmp(v, "1") || !strcasecmp(v, "true") || !strcasecmp(v, "on"))
780            b[i-1].value = 1;
781        else if (!strcmp(v, "0") || !strcasecmp(v, "false") || !strcasecmp(v, "off"))
782            b[i-1].value = 0;
783        else {
784            ERROR("setsebool: invalid value %s\n", v);
785            return -EINVAL;
786        }
787    }
788
789    if (security_set_boolean_list(nargs - 1, b, 0) < 0)
790        return -errno;
791#endif
792    return 0;
793}
794
795int do_loglevel(int nargs, char **args) {
796    if (nargs == 2) {
797        klog_set_level(atoi(args[1]));
798        return 0;
799    }
800    return -1;
801}
802
803int do_load_persist_props(int nargs, char **args) {
804    if (nargs == 1) {
805        load_persist_props();
806        return 0;
807    }
808    return -1;
809}
810
811int do_wait(int nargs, char **args)
812{
813    if (nargs == 2) {
814        return wait_for_file(args[1], COMMAND_RETRY_TIMEOUT);
815    }
816    return -1;
817}
818