installd.cpp revision 6fe28a06012250da85f808a0869f87e06e0bcce9 
1/*
2** Copyright 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/capability.h>
18#include <sys/prctl.h>
19#include <selinux/android.h>
20#include <selinux/avc.h>
21
22#include "installd.h"
23
24
25#define BUFFER_MAX    1024  /* input buffer for commands */
26#define TOKEN_MAX     16    /* max number of arguments in buffer */
27#define REPLY_MAX     256   /* largest reply allowed */
28
29static char* parse_null(char* arg) {
30    if (strcmp(arg, "!") == 0) {
31        return nullptr;
32    } else {
33        return arg;
34    }
35}
36
37static int do_ping(char **arg __unused, char reply[REPLY_MAX] __unused)
38{
39    return 0;
40}
41
42static int do_install(char **arg, char reply[REPLY_MAX] __unused)
43{
44    return install(parse_null(arg[0]), arg[1], atoi(arg[2]), atoi(arg[3]), arg[4]); /* uuid, pkgname, uid, gid, seinfo */
45}
46
47static int do_dexopt(char **arg, char reply[REPLY_MAX] __unused)
48{
49    /* apk_path, uid, is_public, pkgname, instruction_set,
50     * dexopt_needed, vm_safe_mode, debuggable, oat_dir */
51    return dexopt(arg[0], atoi(arg[1]), atoi(arg[2]), arg[3], arg[4], atoi(arg[5]),
52                  atoi(arg[6]), atoi(arg[7]), arg[8]);
53}
54
55static int do_mark_boot_complete(char **arg, char reply[REPLY_MAX] __unused)
56{
57    return mark_boot_complete(arg[0] /* instruction set */);
58}
59
60static int do_move_dex(char **arg, char reply[REPLY_MAX] __unused)
61{
62    return move_dex(arg[0], arg[1], arg[2]); /* src, dst, instruction_set */
63}
64
65static int do_rm_dex(char **arg, char reply[REPLY_MAX] __unused)
66{
67    return rm_dex(arg[0], arg[1]); /* pkgname, instruction_set */
68}
69
70static int do_remove(char **arg, char reply[REPLY_MAX] __unused)
71{
72    return uninstall(parse_null(arg[0]), arg[1], atoi(arg[2])); /* uuid, pkgname, userid */
73}
74
75static int do_rename(char **arg, char reply[REPLY_MAX] __unused)
76{
77    return renamepkg(arg[0], arg[1]); /* oldpkgname, newpkgname */
78}
79
80static int do_fixuid(char **arg, char reply[REPLY_MAX] __unused)
81{
82    return fix_uid(parse_null(arg[0]), arg[1], atoi(arg[2]), atoi(arg[3])); /* uuid, pkgname, uid, gid */
83}
84
85static int do_free_cache(char **arg, char reply[REPLY_MAX] __unused) /* TODO int:free_size */
86{
87    return free_cache(parse_null(arg[0]), (int64_t)atoll(arg[1])); /* uuid, free_size */
88}
89
90static int do_rm_cache(char **arg, char reply[REPLY_MAX] __unused)
91{
92    return delete_cache(parse_null(arg[0]), arg[1], atoi(arg[2])); /* uuid, pkgname, userid */
93}
94
95static int do_rm_code_cache(char **arg, char reply[REPLY_MAX] __unused)
96{
97    return delete_code_cache(parse_null(arg[0]), arg[1], atoi(arg[2])); /* uuid, pkgname, userid */
98}
99
100static int do_get_size(char **arg, char reply[REPLY_MAX])
101{
102    int64_t codesize = 0;
103    int64_t datasize = 0;
104    int64_t cachesize = 0;
105    int64_t asecsize = 0;
106    int res = 0;
107
108        /* uuid, pkgdir, userid, apkpath */
109    res = get_size(parse_null(arg[0]), arg[1], atoi(arg[2]), arg[3], arg[4], arg[5], arg[6],
110            arg[7], &codesize, &datasize, &cachesize, &asecsize);
111
112    /*
113     * Each int64_t can take up 22 characters printed out. Make sure it
114     * doesn't go over REPLY_MAX in the future.
115     */
116    snprintf(reply, REPLY_MAX, "%" PRId64 " %" PRId64 " %" PRId64 " %" PRId64,
117            codesize, datasize, cachesize, asecsize);
118    return res;
119}
120
121static int do_rm_user_data(char **arg, char reply[REPLY_MAX] __unused)
122{
123    return delete_user_data(parse_null(arg[0]), arg[1], atoi(arg[2])); /* uuid, pkgname, userid */
124}
125
126static int do_mk_user_data(char **arg, char reply[REPLY_MAX] __unused)
127{
128    return make_user_data(parse_null(arg[0]), arg[1], atoi(arg[2]), atoi(arg[3]), arg[4]);
129                             /* uuid, pkgname, uid, userid, seinfo */
130}
131
132static int do_mk_user_config(char **arg, char reply[REPLY_MAX] __unused)
133{
134    return make_user_config(atoi(arg[0])); /* userid */
135}
136
137static int do_rm_user(char **arg, char reply[REPLY_MAX] __unused)
138{
139    return delete_user(parse_null(arg[0]), atoi(arg[1])); /* uuid, userid */
140}
141
142static int do_movefiles(char **arg __unused, char reply[REPLY_MAX] __unused)
143{
144    return movefiles();
145}
146
147static int do_linklib(char **arg, char reply[REPLY_MAX] __unused)
148{
149    return linklib(parse_null(arg[0]), arg[1], arg[2], atoi(arg[3]));
150}
151
152static int do_idmap(char **arg, char reply[REPLY_MAX] __unused)
153{
154    return idmap(arg[0], arg[1], atoi(arg[2]));
155}
156
157static int do_restorecon_data(char **arg, char reply[REPLY_MAX] __attribute__((unused)))
158{
159    return restorecon_data(parse_null(arg[0]), arg[1], arg[2], atoi(arg[3]));
160                             /* uuid, pkgName, seinfo, uid*/
161}
162
163static int do_create_oat_dir(char **arg, char reply[REPLY_MAX] __unused)
164{
165    /* oat_dir, instruction_set */
166    return create_oat_dir(arg[0], arg[1]);
167}
168
169static int do_rm_package_dir(char **arg, char reply[REPLY_MAX] __unused)
170{
171    /* oat_dir */
172    return rm_package_dir(arg[0]);
173}
174
175struct cmdinfo {
176    const char *name;
177    unsigned numargs;
178    int (*func)(char **arg, char reply[REPLY_MAX]);
179};
180
181struct cmdinfo cmds[] = {
182    { "ping",                 0, do_ping },
183    { "install",              5, do_install },
184    { "dexopt",               9, do_dexopt },
185    { "markbootcomplete",     1, do_mark_boot_complete },
186    { "movedex",              3, do_move_dex },
187    { "rmdex",                2, do_rm_dex },
188    { "remove",               3, do_remove },
189    { "rename",               2, do_rename },
190    { "fixuid",               4, do_fixuid },
191    { "freecache",            2, do_free_cache },
192    { "rmcache",              3, do_rm_cache },
193    { "rmcodecache",          3, do_rm_code_cache },
194    { "getsize",              8, do_get_size },
195    { "rmuserdata",           3, do_rm_user_data },
196    { "movefiles",            0, do_movefiles },
197    { "linklib",              4, do_linklib },
198    { "mkuserdata",           5, do_mk_user_data },
199    { "mkuserconfig",         1, do_mk_user_config },
200    { "rmuser",               2, do_rm_user },
201    { "idmap",                3, do_idmap },
202    { "restorecondata",       4, do_restorecon_data },
203    { "createoatdir",         2, do_create_oat_dir },
204    { "rmpackagedir",         1, do_rm_package_dir},
205};
206
207static int readx(int s, void *_buf, int count)
208{
209    char *buf = (char *) _buf;
210    int n = 0, r;
211    if (count < 0) return -1;
212    while (n < count) {
213        r = read(s, buf + n, count - n);
214        if (r < 0) {
215            if (errno == EINTR) continue;
216            ALOGE("read error: %s\n", strerror(errno));
217            return -1;
218        }
219        if (r == 0) {
220            ALOGE("eof\n");
221            return -1; /* EOF */
222        }
223        n += r;
224    }
225    return 0;
226}
227
228static int writex(int s, const void *_buf, int count)
229{
230    const char *buf = (const char *) _buf;
231    int n = 0, r;
232    if (count < 0) return -1;
233    while (n < count) {
234        r = write(s, buf + n, count - n);
235        if (r < 0) {
236            if (errno == EINTR) continue;
237            ALOGE("write error: %s\n", strerror(errno));
238            return -1;
239        }
240        n += r;
241    }
242    return 0;
243}
244
245
246/* Tokenize the command buffer, locate a matching command,
247 * ensure that the required number of arguments are provided,
248 * call the function(), return the result.
249 */
250static int execute(int s, char cmd[BUFFER_MAX])
251{
252    char reply[REPLY_MAX];
253    char *arg[TOKEN_MAX+1];
254    unsigned i;
255    unsigned n = 0;
256    unsigned short count;
257    int ret = -1;
258
259    // ALOGI("execute('%s')\n", cmd);
260
261        /* default reply is "" */
262    reply[0] = 0;
263
264        /* n is number of args (not counting arg[0]) */
265    arg[0] = cmd;
266    while (*cmd) {
267        if (isspace(*cmd)) {
268            *cmd++ = 0;
269            n++;
270            arg[n] = cmd;
271            if (n == TOKEN_MAX) {
272                ALOGE("too many arguments\n");
273                goto done;
274            }
275        }
276        if (*cmd) {
277          cmd++;
278        }
279    }
280
281    for (i = 0; i < sizeof(cmds) / sizeof(cmds[0]); i++) {
282        if (!strcmp(cmds[i].name,arg[0])) {
283            if (n != cmds[i].numargs) {
284                ALOGE("%s requires %d arguments (%d given)\n",
285                     cmds[i].name, cmds[i].numargs, n);
286            } else {
287                ret = cmds[i].func(arg + 1, reply);
288            }
289            goto done;
290        }
291    }
292    ALOGE("unsupported command '%s'\n", arg[0]);
293
294done:
295    if (reply[0]) {
296        n = snprintf(cmd, BUFFER_MAX, "%d %s", ret, reply);
297    } else {
298        n = snprintf(cmd, BUFFER_MAX, "%d", ret);
299    }
300    if (n > BUFFER_MAX) n = BUFFER_MAX;
301    count = n;
302
303    // ALOGI("reply: '%s'\n", cmd);
304    if (writex(s, &count, sizeof(count))) return -1;
305    if (writex(s, cmd, count)) return -1;
306    return 0;
307}
308
309/**
310 * Initialize all the global variables that are used elsewhere. Returns 0 upon
311 * success and -1 on error.
312 */
313void free_globals() {
314    size_t i;
315
316    for (i = 0; i < android_system_dirs.count; i++) {
317        if (android_system_dirs.dirs[i].path != NULL) {
318            free(android_system_dirs.dirs[i].path);
319        }
320    }
321
322    free(android_system_dirs.dirs);
323}
324
325int initialize_globals() {
326    // Get the android data directory.
327    if (get_path_from_env(&android_data_dir, "ANDROID_DATA") < 0) {
328        return -1;
329    }
330
331    // Get the android app directory.
332    if (copy_and_append(&android_app_dir, &android_data_dir, APP_SUBDIR) < 0) {
333        return -1;
334    }
335
336    // Get the android protected app directory.
337    if (copy_and_append(&android_app_private_dir, &android_data_dir, PRIVATE_APP_SUBDIR) < 0) {
338        return -1;
339    }
340
341    // Get the android app native library directory.
342    if (copy_and_append(&android_app_lib_dir, &android_data_dir, APP_LIB_SUBDIR) < 0) {
343        return -1;
344    }
345
346    // Get the sd-card ASEC mount point.
347    if (get_path_from_env(&android_asec_dir, "ASEC_MOUNTPOINT") < 0) {
348        return -1;
349    }
350
351    // Get the android media directory.
352    if (copy_and_append(&android_media_dir, &android_data_dir, MEDIA_SUBDIR) < 0) {
353        return -1;
354    }
355
356    // Get the android external app directory.
357    if (get_path_from_string(&android_mnt_expand_dir, "/mnt/expand/") < 0) {
358        return -1;
359    }
360
361    // Take note of the system and vendor directories.
362    android_system_dirs.count = 4;
363
364    android_system_dirs.dirs = (dir_rec_t*) calloc(android_system_dirs.count, sizeof(dir_rec_t));
365    if (android_system_dirs.dirs == NULL) {
366        ALOGE("Couldn't allocate array for dirs; aborting\n");
367        return -1;
368    }
369
370    dir_rec_t android_root_dir;
371    if (get_path_from_env(&android_root_dir, "ANDROID_ROOT") < 0) {
372        ALOGE("Missing ANDROID_ROOT; aborting\n");
373        return -1;
374    }
375
376    android_system_dirs.dirs[0].path = build_string2(android_root_dir.path, APP_SUBDIR);
377    android_system_dirs.dirs[0].len = strlen(android_system_dirs.dirs[0].path);
378
379    android_system_dirs.dirs[1].path = build_string2(android_root_dir.path, PRIV_APP_SUBDIR);
380    android_system_dirs.dirs[1].len = strlen(android_system_dirs.dirs[1].path);
381
382    android_system_dirs.dirs[2].path = strdup("/vendor/app/");
383    android_system_dirs.dirs[2].len = strlen(android_system_dirs.dirs[2].path);
384
385    android_system_dirs.dirs[3].path = strdup("/oem/app/");
386    android_system_dirs.dirs[3].len = strlen(android_system_dirs.dirs[3].path);
387
388    return 0;
389}
390
391int initialize_directories() {
392    int res = -1;
393
394    // Read current filesystem layout version to handle upgrade paths
395    char version_path[PATH_MAX];
396    snprintf(version_path, PATH_MAX, "%s.layout_version", android_data_dir.path);
397
398    int oldVersion;
399    if (fs_read_atomic_int(version_path, &oldVersion) == -1) {
400        oldVersion = 0;
401    }
402    int version = oldVersion;
403
404    // /data/user
405    char *user_data_dir = build_string2(android_data_dir.path, SECONDARY_USER_PREFIX);
406    // /data/data
407    char *legacy_data_dir = build_string2(android_data_dir.path, PRIMARY_USER_PREFIX);
408    // /data/user/0
409    char *primary_data_dir = build_string3(android_data_dir.path, SECONDARY_USER_PREFIX, "0");
410    if (!user_data_dir || !legacy_data_dir || !primary_data_dir) {
411        goto fail;
412    }
413
414    // Make the /data/user directory if necessary
415    if (access(user_data_dir, R_OK) < 0) {
416        if (mkdir(user_data_dir, 0711) < 0) {
417            goto fail;
418        }
419        if (chown(user_data_dir, AID_SYSTEM, AID_SYSTEM) < 0) {
420            goto fail;
421        }
422        if (chmod(user_data_dir, 0711) < 0) {
423            goto fail;
424        }
425    }
426    // Make the /data/user/0 symlink to /data/data if necessary
427    if (access(primary_data_dir, R_OK) < 0) {
428        if (symlink(legacy_data_dir, primary_data_dir)) {
429            goto fail;
430        }
431    }
432
433    if (version == 0) {
434        // Introducing multi-user, so migrate /data/media contents into /data/media/0
435        ALOGD("Upgrading /data/media for multi-user");
436
437        // Ensure /data/media
438        if (fs_prepare_dir(android_media_dir.path, 0770, AID_MEDIA_RW, AID_MEDIA_RW) == -1) {
439            goto fail;
440        }
441
442        // /data/media.tmp
443        char media_tmp_dir[PATH_MAX];
444        snprintf(media_tmp_dir, PATH_MAX, "%smedia.tmp", android_data_dir.path);
445
446        // Only copy when upgrade not already in progress
447        if (access(media_tmp_dir, F_OK) == -1) {
448            if (rename(android_media_dir.path, media_tmp_dir) == -1) {
449                ALOGE("Failed to move legacy media path: %s", strerror(errno));
450                goto fail;
451            }
452        }
453
454        // Create /data/media again
455        if (fs_prepare_dir(android_media_dir.path, 0770, AID_MEDIA_RW, AID_MEDIA_RW) == -1) {
456            goto fail;
457        }
458
459        if (selinux_android_restorecon(android_media_dir.path, 0)) {
460            goto fail;
461        }
462
463        // /data/media/0
464        char owner_media_dir[PATH_MAX];
465        snprintf(owner_media_dir, PATH_MAX, "%s0", android_media_dir.path);
466
467        // Move any owner data into place
468        if (access(media_tmp_dir, F_OK) == 0) {
469            if (rename(media_tmp_dir, owner_media_dir) == -1) {
470                ALOGE("Failed to move owner media path: %s", strerror(errno));
471                goto fail;
472            }
473        }
474
475        // Ensure media directories for any existing users
476        DIR *dir;
477        struct dirent *dirent;
478        char user_media_dir[PATH_MAX];
479
480        dir = opendir(user_data_dir);
481        if (dir != NULL) {
482            while ((dirent = readdir(dir))) {
483                if (dirent->d_type == DT_DIR) {
484                    const char *name = dirent->d_name;
485
486                    // skip "." and ".."
487                    if (name[0] == '.') {
488                        if (name[1] == 0) continue;
489                        if ((name[1] == '.') && (name[2] == 0)) continue;
490                    }
491
492                    // /data/media/<user_id>
493                    snprintf(user_media_dir, PATH_MAX, "%s%s", android_media_dir.path, name);
494                    if (fs_prepare_dir(user_media_dir, 0770, AID_MEDIA_RW, AID_MEDIA_RW) == -1) {
495                        goto fail;
496                    }
497                }
498            }
499            closedir(dir);
500        }
501
502        version = 1;
503    }
504
505    // /data/media/obb
506    char media_obb_dir[PATH_MAX];
507    snprintf(media_obb_dir, PATH_MAX, "%sobb", android_media_dir.path);
508
509    if (version == 1) {
510        // Introducing /data/media/obb for sharing OBB across users; migrate
511        // any existing OBB files from owner.
512        ALOGD("Upgrading to shared /data/media/obb");
513
514        // /data/media/0/Android/obb
515        char owner_obb_path[PATH_MAX];
516        snprintf(owner_obb_path, PATH_MAX, "%s0/Android/obb", android_media_dir.path);
517
518        // Only move if target doesn't already exist
519        if (access(media_obb_dir, F_OK) != 0 && access(owner_obb_path, F_OK) == 0) {
520            if (rename(owner_obb_path, media_obb_dir) == -1) {
521                ALOGE("Failed to move OBB from owner: %s", strerror(errno));
522                goto fail;
523            }
524        }
525
526        version = 2;
527    }
528
529    if (ensure_media_user_dirs(nullptr, 0) == -1) {
530        ALOGE("Failed to setup media for user 0");
531        goto fail;
532    }
533    if (fs_prepare_dir(media_obb_dir, 0770, AID_MEDIA_RW, AID_MEDIA_RW) == -1) {
534        goto fail;
535    }
536
537    if (ensure_config_user_dirs(0) == -1) {
538        ALOGE("Failed to setup misc for user 0");
539        goto fail;
540    }
541
542    if (version == 2) {
543        ALOGD("Upgrading to /data/misc/user directories");
544
545        char misc_dir[PATH_MAX];
546        snprintf(misc_dir, PATH_MAX, "%smisc", android_data_dir.path);
547
548        char keychain_added_dir[PATH_MAX];
549        snprintf(keychain_added_dir, PATH_MAX, "%s/keychain/cacerts-added", misc_dir);
550
551        char keychain_removed_dir[PATH_MAX];
552        snprintf(keychain_removed_dir, PATH_MAX, "%s/keychain/cacerts-removed", misc_dir);
553
554        DIR *dir;
555        struct dirent *dirent;
556        dir = opendir(user_data_dir);
557        if (dir != NULL) {
558            while ((dirent = readdir(dir))) {
559                const char *name = dirent->d_name;
560
561                // skip "." and ".."
562                if (name[0] == '.') {
563                    if (name[1] == 0) continue;
564                    if ((name[1] == '.') && (name[2] == 0)) continue;
565                }
566
567                uint32_t user_id = atoi(name);
568
569                // /data/misc/user/<user_id>
570                if (ensure_config_user_dirs(user_id) == -1) {
571                    goto fail;
572                }
573
574                char misc_added_dir[PATH_MAX];
575                snprintf(misc_added_dir, PATH_MAX, "%s/user/%s/cacerts-added", misc_dir, name);
576
577                char misc_removed_dir[PATH_MAX];
578                snprintf(misc_removed_dir, PATH_MAX, "%s/user/%s/cacerts-removed", misc_dir, name);
579
580                uid_t uid = multiuser_get_uid(user_id, AID_SYSTEM);
581                gid_t gid = uid;
582                if (access(keychain_added_dir, F_OK) == 0) {
583                    if (copy_dir_files(keychain_added_dir, misc_added_dir, uid, gid) != 0) {
584                        ALOGE("Some files failed to copy");
585                    }
586                }
587                if (access(keychain_removed_dir, F_OK) == 0) {
588                    if (copy_dir_files(keychain_removed_dir, misc_removed_dir, uid, gid) != 0) {
589                        ALOGE("Some files failed to copy");
590                    }
591                }
592            }
593            closedir(dir);
594
595            if (access(keychain_added_dir, F_OK) == 0) {
596                delete_dir_contents(keychain_added_dir, 1, 0);
597            }
598            if (access(keychain_removed_dir, F_OK) == 0) {
599                delete_dir_contents(keychain_removed_dir, 1, 0);
600            }
601        }
602
603        version = 3;
604    }
605
606    // Persist layout version if changed
607    if (version != oldVersion) {
608        if (fs_write_atomic_int(version_path, version) == -1) {
609            ALOGE("Failed to save version to %s: %s", version_path, strerror(errno));
610            goto fail;
611        }
612    }
613
614    // Success!
615    res = 0;
616
617fail:
618    free(user_data_dir);
619    free(legacy_data_dir);
620    free(primary_data_dir);
621    return res;
622}
623
624static void drop_privileges() {
625    if (prctl(PR_SET_KEEPCAPS, 1) < 0) {
626        ALOGE("prctl(PR_SET_KEEPCAPS) failed: %s\n", strerror(errno));
627        exit(1);
628    }
629
630    if (setgid(AID_INSTALL) < 0) {
631        ALOGE("setgid() can't drop privileges; exiting.\n");
632        exit(1);
633    }
634
635    if (setuid(AID_INSTALL) < 0) {
636        ALOGE("setuid() can't drop privileges; exiting.\n");
637        exit(1);
638    }
639
640    struct __user_cap_header_struct capheader;
641    struct __user_cap_data_struct capdata[2];
642    memset(&capheader, 0, sizeof(capheader));
643    memset(&capdata, 0, sizeof(capdata));
644    capheader.version = _LINUX_CAPABILITY_VERSION_3;
645    capheader.pid = 0;
646
647    capdata[CAP_TO_INDEX(CAP_DAC_OVERRIDE)].permitted |= CAP_TO_MASK(CAP_DAC_OVERRIDE);
648    capdata[CAP_TO_INDEX(CAP_CHOWN)].permitted        |= CAP_TO_MASK(CAP_CHOWN);
649    capdata[CAP_TO_INDEX(CAP_SETUID)].permitted       |= CAP_TO_MASK(CAP_SETUID);
650    capdata[CAP_TO_INDEX(CAP_SETGID)].permitted       |= CAP_TO_MASK(CAP_SETGID);
651    capdata[CAP_TO_INDEX(CAP_FOWNER)].permitted       |= CAP_TO_MASK(CAP_FOWNER);
652
653    capdata[0].effective = capdata[0].permitted;
654    capdata[1].effective = capdata[1].permitted;
655    capdata[0].inheritable = 0;
656    capdata[1].inheritable = 0;
657
658    if (capset(&capheader, &capdata[0]) < 0) {
659        ALOGE("capset failed: %s\n", strerror(errno));
660        exit(1);
661    }
662}
663
664static int log_callback(int type, const char *fmt, ...) {
665    va_list ap;
666    int priority;
667
668    switch (type) {
669    case SELINUX_WARNING:
670        priority = ANDROID_LOG_WARN;
671        break;
672    case SELINUX_INFO:
673        priority = ANDROID_LOG_INFO;
674        break;
675    default:
676        priority = ANDROID_LOG_ERROR;
677        break;
678    }
679    va_start(ap, fmt);
680    LOG_PRI_VA(priority, "SELinux", fmt, ap);
681    va_end(ap);
682    return 0;
683}
684
685int main(const int argc __unused, const char *argv[] __unused) {
686    char buf[BUFFER_MAX];
687    struct sockaddr addr;
688    socklen_t alen;
689    int lsocket, s;
690    int selinux_enabled = (is_selinux_enabled() > 0);
691
692    ALOGI("installd firing up\n");
693
694    union selinux_callback cb;
695    cb.func_log = log_callback;
696    selinux_set_callback(SELINUX_CB_LOG, cb);
697
698    if (initialize_globals() < 0) {
699        ALOGE("Could not initialize globals; exiting.\n");
700        exit(1);
701    }
702
703    if (initialize_directories() < 0) {
704        ALOGE("Could not create directories; exiting.\n");
705        exit(1);
706    }
707
708    if (selinux_enabled && selinux_status_open(true) < 0) {
709        ALOGE("Could not open selinux status; exiting.\n");
710        exit(1);
711    }
712
713    drop_privileges();
714
715    lsocket = android_get_control_socket(SOCKET_PATH);
716    if (lsocket < 0) {
717        ALOGE("Failed to get socket from environment: %s\n", strerror(errno));
718        exit(1);
719    }
720    if (listen(lsocket, 5)) {
721        ALOGE("Listen on socket failed: %s\n", strerror(errno));
722        exit(1);
723    }
724    fcntl(lsocket, F_SETFD, FD_CLOEXEC);
725
726    for (;;) {
727        alen = sizeof(addr);
728        s = accept(lsocket, &addr, &alen);
729        if (s < 0) {
730            ALOGE("Accept failed: %s\n", strerror(errno));
731            continue;
732        }
733        fcntl(s, F_SETFD, FD_CLOEXEC);
734
735        ALOGI("new connection\n");
736        for (;;) {
737            unsigned short count;
738            if (readx(s, &count, sizeof(count))) {
739                ALOGE("failed to read size\n");
740                break;
741            }
742            if ((count < 1) || (count >= BUFFER_MAX)) {
743                ALOGE("invalid size %d\n", count);
744                break;
745            }
746            if (readx(s, buf, count)) {
747                ALOGE("failed to read command\n");
748                break;
749            }
750            buf[count] = 0;
751            if (selinux_enabled && selinux_status_updated() > 0) {
752                selinux_android_seapp_context_reload();
753            }
754            if (execute(s, buf)) break;
755        }
756        ALOGI("closing connection\n");
757        close(s);
758    }
759
760    return 0;
761}
762