installd.cpp revision c03de09173f98506e73e7cf7df21fe11795d4b24 
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 int do_ping(char **arg __unused, char reply[REPLY_MAX] __unused)
30{
31    return 0;
32}
33
34static int do_install(char **arg, char reply[REPLY_MAX] __unused)
35{
36    return install(nullptr, arg[0], atoi(arg[1]), atoi(arg[2]), arg[3]); /* pkgname, uid, gid, seinfo */
37}
38
39static int do_dexopt(char **arg, char reply[REPLY_MAX] __unused)
40{
41    /* apk_path, uid, is_public, pkgname, instruction_set, vm_safe_mode, should_relocate
42       debuggable, outputPath */
43    return dexopt(arg[0], atoi(arg[1]), atoi(arg[2]), arg[3], arg[4], atoi(arg[5]), 0,
44                  atoi(arg[6]), arg[7]);
45}
46
47static int do_mark_boot_complete(char **arg, char reply[REPLY_MAX] __unused)
48{
49    return mark_boot_complete(arg[0] /* instruction set */);
50}
51
52static int do_move_dex(char **arg, char reply[REPLY_MAX] __unused)
53{
54    return move_dex(arg[0], arg[1], arg[2]); /* src, dst, instruction_set */
55}
56
57static int do_rm_dex(char **arg, char reply[REPLY_MAX] __unused)
58{
59    return rm_dex(arg[0], arg[1]); /* pkgname, instruction_set */
60}
61
62static int do_remove(char **arg, char reply[REPLY_MAX] __unused)
63{
64    return uninstall(nullptr, arg[0], atoi(arg[1])); /* pkgname, userid */
65}
66
67static int do_rename(char **arg, char reply[REPLY_MAX] __unused)
68{
69    return renamepkg(arg[0], arg[1]); /* oldpkgname, newpkgname */
70}
71
72static int do_fixuid(char **arg, char reply[REPLY_MAX] __unused)
73{
74    return fix_uid(nullptr, arg[0], atoi(arg[1]), atoi(arg[2])); /* pkgname, uid, gid */
75}
76
77static int do_free_cache(char **arg, char reply[REPLY_MAX] __unused) /* TODO int:free_size */
78{
79    return free_cache((int64_t)atoll(arg[0])); /* free_size */
80}
81
82static int do_rm_cache(char **arg, char reply[REPLY_MAX] __unused)
83{
84    return delete_cache(nullptr, arg[0], atoi(arg[1])); /* pkgname, userid */
85}
86
87static int do_rm_code_cache(char **arg, char reply[REPLY_MAX] __unused)
88{
89    return delete_code_cache(nullptr, arg[0], atoi(arg[1])); /* pkgname, userid */
90}
91
92static int do_get_size(char **arg, char reply[REPLY_MAX])
93{
94    int64_t codesize = 0;
95    int64_t datasize = 0;
96    int64_t cachesize = 0;
97    int64_t asecsize = 0;
98    int res = 0;
99
100        /* pkgdir, userid, apkpath */
101    res = get_size(nullptr, arg[0], atoi(arg[1]), arg[2], arg[3], arg[4], arg[5],
102            arg[6], &codesize, &datasize, &cachesize, &asecsize);
103
104    /*
105     * Each int64_t can take up 22 characters printed out. Make sure it
106     * doesn't go over REPLY_MAX in the future.
107     */
108    snprintf(reply, REPLY_MAX, "%" PRId64 " %" PRId64 " %" PRId64 " %" PRId64,
109            codesize, datasize, cachesize, asecsize);
110    return res;
111}
112
113static int do_rm_user_data(char **arg, char reply[REPLY_MAX] __unused)
114{
115    return delete_user_data(nullptr, arg[0], atoi(arg[1])); /* pkgname, userid */
116}
117
118static int do_mk_user_data(char **arg, char reply[REPLY_MAX] __unused)
119{
120    return make_user_data(nullptr, arg[0], atoi(arg[1]), atoi(arg[2]), arg[3]);
121                             /* pkgname, uid, userid, seinfo */
122}
123
124static int do_mk_user_config(char **arg, char reply[REPLY_MAX] __unused)
125{
126    return make_user_config(atoi(arg[0])); /* userid */
127}
128
129static int do_rm_user(char **arg, char reply[REPLY_MAX] __unused)
130{
131    return delete_user(atoi(arg[0])); /* userid */
132}
133
134static int do_movefiles(char **arg __unused, char reply[REPLY_MAX] __unused)
135{
136    return movefiles();
137}
138
139static int do_linklib(char **arg, char reply[REPLY_MAX] __unused)
140{
141    return linklib(nullptr, arg[0], arg[1], atoi(arg[2]));
142}
143
144static int do_idmap(char **arg, char reply[REPLY_MAX] __unused)
145{
146    return idmap(arg[0], arg[1], atoi(arg[2]));
147}
148
149static int do_restorecon_data(char **arg, char reply[REPLY_MAX] __attribute__((unused)))
150{
151    return restorecon_data(nullptr, arg[0], arg[1], atoi(arg[2]));
152                             /* pkgName, seinfo, uid*/
153}
154
155static int do_patchoat(char **arg, char reply[REPLY_MAX] __unused) {
156    /* apk_path, uid, is_public, pkgname, instruction_set, vm_safe_mode, should_relocate,
157       debuggable, outputPath */
158    return dexopt(arg[0], atoi(arg[1]), atoi(arg[2]), arg[3], arg[4], 0, 1, 0, "!");
159}
160
161static int do_create_oat_dir(char **arg, char reply[REPLY_MAX] __unused)
162{
163    /* oat_dir, instruction_set */
164    return create_oat_dir(arg[0], arg[1]);
165}
166
167static int do_rm_package_dir(char **arg, char reply[REPLY_MAX] __unused)
168{
169    /* oat_dir */
170    return rm_package_dir(arg[0]);
171}
172
173struct cmdinfo {
174    const char *name;
175    unsigned numargs;
176    int (*func)(char **arg, char reply[REPLY_MAX]);
177};
178
179struct cmdinfo cmds[] = {
180    { "ping",                 0, do_ping },
181    { "install",              4, do_install },
182    { "dexopt",               8, do_dexopt },
183    { "markbootcomplete",     1, do_mark_boot_complete },
184    { "movedex",              3, do_move_dex },
185    { "rmdex",                2, do_rm_dex },
186    { "remove",               2, do_remove },
187    { "rename",               2, do_rename },
188    { "fixuid",               3, do_fixuid },
189    { "freecache",            1, do_free_cache },
190    { "rmcache",              2, do_rm_cache },
191    { "rmcodecache",          2, do_rm_code_cache },
192    { "getsize",              7, do_get_size },
193    { "rmuserdata",           2, do_rm_user_data },
194    { "movefiles",            0, do_movefiles },
195    { "linklib",              3, do_linklib },
196    { "mkuserdata",           4, do_mk_user_data },
197    { "mkuserconfig",         1, do_mk_user_config },
198    { "rmuser",               1, do_rm_user },
199    { "idmap",                3, do_idmap },
200    { "restorecondata",       3, do_restorecon_data },
201    { "patchoat",             5, do_patchoat },
202    { "createoatdir",         2, do_create_oat_dir },
203    { "rmpackagedir",         1, do_rm_package_dir},
204};
205
206static int readx(int s, void *_buf, int count)
207{
208    char *buf = (char *) _buf;
209    int n = 0, r;
210    if (count < 0) return -1;
211    while (n < count) {
212        r = read(s, buf + n, count - n);
213        if (r < 0) {
214            if (errno == EINTR) continue;
215            ALOGE("read error: %s\n", strerror(errno));
216            return -1;
217        }
218        if (r == 0) {
219            ALOGE("eof\n");
220            return -1; /* EOF */
221        }
222        n += r;
223    }
224    return 0;
225}
226
227static int writex(int s, const void *_buf, int count)
228{
229    const char *buf = (const char *) _buf;
230    int n = 0, r;
231    if (count < 0) return -1;
232    while (n < count) {
233        r = write(s, buf + n, count - n);
234        if (r < 0) {
235            if (errno == EINTR) continue;
236            ALOGE("write error: %s\n", strerror(errno));
237            return -1;
238        }
239        n += r;
240    }
241    return 0;
242}
243
244
245/* Tokenize the command buffer, locate a matching command,
246 * ensure that the required number of arguments are provided,
247 * call the function(), return the result.
248 */
249static int execute(int s, char cmd[BUFFER_MAX])
250{
251    char reply[REPLY_MAX];
252    char *arg[TOKEN_MAX+1];
253    unsigned i;
254    unsigned n = 0;
255    unsigned short count;
256    int ret = -1;
257
258    // ALOGI("execute('%s')\n", cmd);
259
260        /* default reply is "" */
261    reply[0] = 0;
262
263        /* n is number of args (not counting arg[0]) */
264    arg[0] = cmd;
265    while (*cmd) {
266        if (isspace(*cmd)) {
267            *cmd++ = 0;
268            n++;
269            arg[n] = cmd;
270            if (n == TOKEN_MAX) {
271                ALOGE("too many arguments\n");
272                goto done;
273            }
274        }
275        if (*cmd) {
276          cmd++;
277        }
278    }
279
280    for (i = 0; i < sizeof(cmds) / sizeof(cmds[0]); i++) {
281        if (!strcmp(cmds[i].name,arg[0])) {
282            if (n != cmds[i].numargs) {
283                ALOGE("%s requires %d arguments (%d given)\n",
284                     cmds[i].name, cmds[i].numargs, n);
285            } else {
286                ret = cmds[i].func(arg + 1, reply);
287            }
288            goto done;
289        }
290    }
291    ALOGE("unsupported command '%s'\n", arg[0]);
292
293done:
294    if (reply[0]) {
295        n = snprintf(cmd, BUFFER_MAX, "%d %s", ret, reply);
296    } else {
297        n = snprintf(cmd, BUFFER_MAX, "%d", ret);
298    }
299    if (n > BUFFER_MAX) n = BUFFER_MAX;
300    count = n;
301
302    // ALOGI("reply: '%s'\n", cmd);
303    if (writex(s, &count, sizeof(count))) return -1;
304    if (writex(s, cmd, count)) return -1;
305    return 0;
306}
307
308/**
309 * Initialize all the global variables that are used elsewhere. Returns 0 upon
310 * success and -1 on error.
311 */
312void free_globals() {
313    size_t i;
314
315    for (i = 0; i < android_system_dirs.count; i++) {
316        if (android_system_dirs.dirs[i].path != NULL) {
317            free(android_system_dirs.dirs[i].path);
318        }
319    }
320
321    free(android_system_dirs.dirs);
322}
323
324int initialize_globals() {
325    // Get the android data directory.
326    if (get_path_from_env(&android_data_dir, "ANDROID_DATA") < 0) {
327        return -1;
328    }
329
330    // Get the android app directory.
331    if (copy_and_append(&android_app_dir, &android_data_dir, APP_SUBDIR) < 0) {
332        return -1;
333    }
334
335    // Get the android protected app directory.
336    if (copy_and_append(&android_app_private_dir, &android_data_dir, PRIVATE_APP_SUBDIR) < 0) {
337        return -1;
338    }
339
340    // Get the android app native library directory.
341    if (copy_and_append(&android_app_lib_dir, &android_data_dir, APP_LIB_SUBDIR) < 0) {
342        return -1;
343    }
344
345    // Get the sd-card ASEC mount point.
346    if (get_path_from_env(&android_asec_dir, "ASEC_MOUNTPOINT") < 0) {
347        return -1;
348    }
349
350    // Get the android media directory.
351    if (copy_and_append(&android_media_dir, &android_data_dir, MEDIA_SUBDIR) < 0) {
352        return -1;
353    }
354
355    // Get the android external app directory.
356    if (get_path_from_string(&android_mnt_expand_dir, "/mnt/expand/") < 0) {
357        return -1;
358    }
359
360    // Take note of the system and vendor directories.
361    android_system_dirs.count = 4;
362
363    android_system_dirs.dirs = (dir_rec_t*) calloc(android_system_dirs.count, sizeof(dir_rec_t));
364    if (android_system_dirs.dirs == NULL) {
365        ALOGE("Couldn't allocate array for dirs; aborting\n");
366        return -1;
367    }
368
369    dir_rec_t android_root_dir;
370    if (get_path_from_env(&android_root_dir, "ANDROID_ROOT") < 0) {
371        ALOGE("Missing ANDROID_ROOT; aborting\n");
372        return -1;
373    }
374
375    android_system_dirs.dirs[0].path = build_string2(android_root_dir.path, APP_SUBDIR);
376    android_system_dirs.dirs[0].len = strlen(android_system_dirs.dirs[0].path);
377
378    android_system_dirs.dirs[1].path = build_string2(android_root_dir.path, PRIV_APP_SUBDIR);
379    android_system_dirs.dirs[1].len = strlen(android_system_dirs.dirs[1].path);
380
381    android_system_dirs.dirs[2].path = strdup("/vendor/app/");
382    android_system_dirs.dirs[2].len = strlen(android_system_dirs.dirs[2].path);
383
384    android_system_dirs.dirs[3].path = strdup("/oem/app/");
385    android_system_dirs.dirs[3].len = strlen(android_system_dirs.dirs[3].path);
386
387    return 0;
388}
389
390int initialize_directories() {
391    int res = -1;
392
393    // Read current filesystem layout version to handle upgrade paths
394    char version_path[PATH_MAX];
395    snprintf(version_path, PATH_MAX, "%s.layout_version", android_data_dir.path);
396
397    int oldVersion;
398    if (fs_read_atomic_int(version_path, &oldVersion) == -1) {
399        oldVersion = 0;
400    }
401    int version = oldVersion;
402
403    // /data/user
404    char *user_data_dir = build_string2(android_data_dir.path, SECONDARY_USER_PREFIX);
405    // /data/data
406    char *legacy_data_dir = build_string2(android_data_dir.path, PRIMARY_USER_PREFIX);
407    // /data/user/0
408    char *primary_data_dir = build_string3(android_data_dir.path, SECONDARY_USER_PREFIX, "0");
409    if (!user_data_dir || !legacy_data_dir || !primary_data_dir) {
410        goto fail;
411    }
412
413    // Make the /data/user directory if necessary
414    if (access(user_data_dir, R_OK) < 0) {
415        if (mkdir(user_data_dir, 0711) < 0) {
416            goto fail;
417        }
418        if (chown(user_data_dir, AID_SYSTEM, AID_SYSTEM) < 0) {
419            goto fail;
420        }
421        if (chmod(user_data_dir, 0711) < 0) {
422            goto fail;
423        }
424    }
425    // Make the /data/user/0 symlink to /data/data if necessary
426    if (access(primary_data_dir, R_OK) < 0) {
427        if (symlink(legacy_data_dir, primary_data_dir)) {
428            goto fail;
429        }
430    }
431
432    if (version == 0) {
433        // Introducing multi-user, so migrate /data/media contents into /data/media/0
434        ALOGD("Upgrading /data/media for multi-user");
435
436        // Ensure /data/media
437        if (fs_prepare_dir(android_media_dir.path, 0770, AID_MEDIA_RW, AID_MEDIA_RW) == -1) {
438            goto fail;
439        }
440
441        // /data/media.tmp
442        char media_tmp_dir[PATH_MAX];
443        snprintf(media_tmp_dir, PATH_MAX, "%smedia.tmp", android_data_dir.path);
444
445        // Only copy when upgrade not already in progress
446        if (access(media_tmp_dir, F_OK) == -1) {
447            if (rename(android_media_dir.path, media_tmp_dir) == -1) {
448                ALOGE("Failed to move legacy media path: %s", strerror(errno));
449                goto fail;
450            }
451        }
452
453        // Create /data/media again
454        if (fs_prepare_dir(android_media_dir.path, 0770, AID_MEDIA_RW, AID_MEDIA_RW) == -1) {
455            goto fail;
456        }
457
458        if (selinux_android_restorecon(android_media_dir.path, 0)) {
459            goto fail;
460        }
461
462        // /data/media/0
463        char owner_media_dir[PATH_MAX];
464        snprintf(owner_media_dir, PATH_MAX, "%s0", android_media_dir.path);
465
466        // Move any owner data into place
467        if (access(media_tmp_dir, F_OK) == 0) {
468            if (rename(media_tmp_dir, owner_media_dir) == -1) {
469                ALOGE("Failed to move owner media path: %s", strerror(errno));
470                goto fail;
471            }
472        }
473
474        // Ensure media directories for any existing users
475        DIR *dir;
476        struct dirent *dirent;
477        char user_media_dir[PATH_MAX];
478
479        dir = opendir(user_data_dir);
480        if (dir != NULL) {
481            while ((dirent = readdir(dir))) {
482                if (dirent->d_type == DT_DIR) {
483                    const char *name = dirent->d_name;
484
485                    // skip "." and ".."
486                    if (name[0] == '.') {
487                        if (name[1] == 0) continue;
488                        if ((name[1] == '.') && (name[2] == 0)) continue;
489                    }
490
491                    // /data/media/<user_id>
492                    snprintf(user_media_dir, PATH_MAX, "%s%s", android_media_dir.path, name);
493                    if (fs_prepare_dir(user_media_dir, 0770, AID_MEDIA_RW, AID_MEDIA_RW) == -1) {
494                        goto fail;
495                    }
496                }
497            }
498            closedir(dir);
499        }
500
501        version = 1;
502    }
503
504    // /data/media/obb
505    char media_obb_dir[PATH_MAX];
506    snprintf(media_obb_dir, PATH_MAX, "%sobb", android_media_dir.path);
507
508    if (version == 1) {
509        // Introducing /data/media/obb for sharing OBB across users; migrate
510        // any existing OBB files from owner.
511        ALOGD("Upgrading to shared /data/media/obb");
512
513        // /data/media/0/Android/obb
514        char owner_obb_path[PATH_MAX];
515        snprintf(owner_obb_path, PATH_MAX, "%s0/Android/obb", android_media_dir.path);
516
517        // Only move if target doesn't already exist
518        if (access(media_obb_dir, F_OK) != 0 && access(owner_obb_path, F_OK) == 0) {
519            if (rename(owner_obb_path, media_obb_dir) == -1) {
520                ALOGE("Failed to move OBB from owner: %s", strerror(errno));
521                goto fail;
522            }
523        }
524
525        version = 2;
526    }
527
528    if (ensure_media_user_dirs(0) == -1) {
529        ALOGE("Failed to setup media for user 0");
530        goto fail;
531    }
532    if (fs_prepare_dir(media_obb_dir, 0770, AID_MEDIA_RW, AID_MEDIA_RW) == -1) {
533        goto fail;
534    }
535
536    if (ensure_config_user_dirs(0) == -1) {
537        ALOGE("Failed to setup misc for user 0");
538        goto fail;
539    }
540
541    if (version == 2) {
542        ALOGD("Upgrading to /data/misc/user directories");
543
544        char misc_dir[PATH_MAX];
545        snprintf(misc_dir, PATH_MAX, "%smisc", android_data_dir.path);
546
547        char keychain_added_dir[PATH_MAX];
548        snprintf(keychain_added_dir, PATH_MAX, "%s/keychain/cacerts-added", misc_dir);
549
550        char keychain_removed_dir[PATH_MAX];
551        snprintf(keychain_removed_dir, PATH_MAX, "%s/keychain/cacerts-removed", misc_dir);
552
553        DIR *dir;
554        struct dirent *dirent;
555        dir = opendir(user_data_dir);
556        if (dir != NULL) {
557            while ((dirent = readdir(dir))) {
558                const char *name = dirent->d_name;
559
560                // skip "." and ".."
561                if (name[0] == '.') {
562                    if (name[1] == 0) continue;
563                    if ((name[1] == '.') && (name[2] == 0)) continue;
564                }
565
566                uint32_t user_id = atoi(name);
567
568                // /data/misc/user/<user_id>
569                if (ensure_config_user_dirs(user_id) == -1) {
570                    goto fail;
571                }
572
573                char misc_added_dir[PATH_MAX];
574                snprintf(misc_added_dir, PATH_MAX, "%s/user/%s/cacerts-added", misc_dir, name);
575
576                char misc_removed_dir[PATH_MAX];
577                snprintf(misc_removed_dir, PATH_MAX, "%s/user/%s/cacerts-removed", misc_dir, name);
578
579                uid_t uid = multiuser_get_uid(user_id, AID_SYSTEM);
580                gid_t gid = uid;
581                if (access(keychain_added_dir, F_OK) == 0) {
582                    if (copy_dir_files(keychain_added_dir, misc_added_dir, uid, gid) != 0) {
583                        ALOGE("Some files failed to copy");
584                    }
585                }
586                if (access(keychain_removed_dir, F_OK) == 0) {
587                    if (copy_dir_files(keychain_removed_dir, misc_removed_dir, uid, gid) != 0) {
588                        ALOGE("Some files failed to copy");
589                    }
590                }
591            }
592            closedir(dir);
593
594            if (access(keychain_added_dir, F_OK) == 0) {
595                delete_dir_contents(keychain_added_dir, 1, 0);
596            }
597            if (access(keychain_removed_dir, F_OK) == 0) {
598                delete_dir_contents(keychain_removed_dir, 1, 0);
599            }
600        }
601
602        version = 3;
603    }
604
605    // Persist layout version if changed
606    if (version != oldVersion) {
607        if (fs_write_atomic_int(version_path, version) == -1) {
608            ALOGE("Failed to save version to %s: %s", version_path, strerror(errno));
609            goto fail;
610        }
611    }
612
613    // Success!
614    res = 0;
615
616fail:
617    free(user_data_dir);
618    free(legacy_data_dir);
619    free(primary_data_dir);
620    return res;
621}
622
623static void drop_privileges() {
624    if (prctl(PR_SET_KEEPCAPS, 1) < 0) {
625        ALOGE("prctl(PR_SET_KEEPCAPS) failed: %s\n", strerror(errno));
626        exit(1);
627    }
628
629    if (setgid(AID_INSTALL) < 0) {
630        ALOGE("setgid() can't drop privileges; exiting.\n");
631        exit(1);
632    }
633
634    if (setuid(AID_INSTALL) < 0) {
635        ALOGE("setuid() can't drop privileges; exiting.\n");
636        exit(1);
637    }
638
639    struct __user_cap_header_struct capheader;
640    struct __user_cap_data_struct capdata[2];
641    memset(&capheader, 0, sizeof(capheader));
642    memset(&capdata, 0, sizeof(capdata));
643    capheader.version = _LINUX_CAPABILITY_VERSION_3;
644    capheader.pid = 0;
645
646    capdata[CAP_TO_INDEX(CAP_DAC_OVERRIDE)].permitted |= CAP_TO_MASK(CAP_DAC_OVERRIDE);
647    capdata[CAP_TO_INDEX(CAP_CHOWN)].permitted        |= CAP_TO_MASK(CAP_CHOWN);
648    capdata[CAP_TO_INDEX(CAP_SETUID)].permitted       |= CAP_TO_MASK(CAP_SETUID);
649    capdata[CAP_TO_INDEX(CAP_SETGID)].permitted       |= CAP_TO_MASK(CAP_SETGID);
650    capdata[CAP_TO_INDEX(CAP_FOWNER)].permitted       |= CAP_TO_MASK(CAP_FOWNER);
651
652    capdata[0].effective = capdata[0].permitted;
653    capdata[1].effective = capdata[1].permitted;
654    capdata[0].inheritable = 0;
655    capdata[1].inheritable = 0;
656
657    if (capset(&capheader, &capdata[0]) < 0) {
658        ALOGE("capset failed: %s\n", strerror(errno));
659        exit(1);
660    }
661}
662
663static int log_callback(int type, const char *fmt, ...) {
664    va_list ap;
665    int priority;
666
667    switch (type) {
668    case SELINUX_WARNING:
669        priority = ANDROID_LOG_WARN;
670        break;
671    case SELINUX_INFO:
672        priority = ANDROID_LOG_INFO;
673        break;
674    default:
675        priority = ANDROID_LOG_ERROR;
676        break;
677    }
678    va_start(ap, fmt);
679    LOG_PRI_VA(priority, "SELinux", fmt, ap);
680    va_end(ap);
681    return 0;
682}
683
684int main(const int argc __unused, const char *argv[] __unused) {
685    char buf[BUFFER_MAX];
686    struct sockaddr addr;
687    socklen_t alen;
688    int lsocket, s;
689    int selinux_enabled = (is_selinux_enabled() > 0);
690
691    ALOGI("installd firing up\n");
692
693    union selinux_callback cb;
694    cb.func_log = log_callback;
695    selinux_set_callback(SELINUX_CB_LOG, cb);
696
697    if (initialize_globals() < 0) {
698        ALOGE("Could not initialize globals; exiting.\n");
699        exit(1);
700    }
701
702    if (initialize_directories() < 0) {
703        ALOGE("Could not create directories; exiting.\n");
704        exit(1);
705    }
706
707    if (selinux_enabled && selinux_status_open(true) < 0) {
708        ALOGE("Could not open selinux status; exiting.\n");
709        exit(1);
710    }
711
712    drop_privileges();
713
714    lsocket = android_get_control_socket(SOCKET_PATH);
715    if (lsocket < 0) {
716        ALOGE("Failed to get socket from environment: %s\n", strerror(errno));
717        exit(1);
718    }
719    if (listen(lsocket, 5)) {
720        ALOGE("Listen on socket failed: %s\n", strerror(errno));
721        exit(1);
722    }
723    fcntl(lsocket, F_SETFD, FD_CLOEXEC);
724
725    for (;;) {
726        alen = sizeof(addr);
727        s = accept(lsocket, &addr, &alen);
728        if (s < 0) {
729            ALOGE("Accept failed: %s\n", strerror(errno));
730            continue;
731        }
732        fcntl(s, F_SETFD, FD_CLOEXEC);
733
734        ALOGI("new connection\n");
735        for (;;) {
736            unsigned short count;
737            if (readx(s, &count, sizeof(count))) {
738                ALOGE("failed to read size\n");
739                break;
740            }
741            if ((count < 1) || (count >= BUFFER_MAX)) {
742                ALOGE("invalid size %d\n", count);
743                break;
744            }
745            if (readx(s, buf, count)) {
746                ALOGE("failed to read command\n");
747                break;
748            }
749            buf[count] = 0;
750            if (selinux_enabled && selinux_status_updated() > 0) {
751                selinux_android_seapp_context_reload();
752            }
753            if (execute(s, buf)) break;
754        }
755        ALOGI("closing connection\n");
756        close(s);
757    }
758
759    return 0;
760}
761