installd.cpp revision 32717f851ec39e44b43dcd2053b091daff5e1753 
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 "installd.h"
18
19#include <android-base/logging.h>
20
21#include <sys/capability.h>
22#include <sys/prctl.h>
23#include <selinux/android.h>
24#include <selinux/avc.h>
25
26#define BUFFER_MAX    1024  /* input buffer for commands */
27#define TOKEN_MAX     16    /* max number of arguments in buffer */
28#define REPLY_MAX     256   /* largest reply allowed */
29
30static char* parse_null(char* arg) {
31    if (strcmp(arg, "!") == 0) {
32        return nullptr;
33    } else {
34        return arg;
35    }
36}
37
38static int do_ping(char **arg __unused, char reply[REPLY_MAX] __unused)
39{
40    return 0;
41}
42
43static int do_install(char **arg, char reply[REPLY_MAX] __unused)
44{
45    return install(parse_null(arg[0]), arg[1], atoi(arg[2]), atoi(arg[3]), arg[4]); /* uuid, pkgname, uid, gid, seinfo */
46}
47
48static int do_dexopt(char **arg, char reply[REPLY_MAX] __unused)
49{
50    /* apk_path, uid, pkgname, instruction_set, dexopt_needed, oat_dir, dexopt_flags */
51    return dexopt(arg[0], atoi(arg[1]), arg[2], arg[3], atoi(arg[4]),
52                  arg[5], atoi(arg[6]));
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_fixuid(char **arg, char reply[REPLY_MAX] __unused)
76{
77    return fix_uid(parse_null(arg[0]), arg[1], atoi(arg[2]), atoi(arg[3])); /* uuid, pkgname, uid, gid */
78}
79
80static int do_free_cache(char **arg, char reply[REPLY_MAX] __unused) /* TODO int:free_size */
81{
82    return free_cache(parse_null(arg[0]), (int64_t)atoll(arg[1])); /* uuid, free_size */
83}
84
85static int do_rm_cache(char **arg, char reply[REPLY_MAX] __unused)
86{
87    return delete_cache(parse_null(arg[0]), arg[1], atoi(arg[2])); /* uuid, pkgname, userid */
88}
89
90static int do_rm_code_cache(char **arg, char reply[REPLY_MAX] __unused)
91{
92    return delete_code_cache(parse_null(arg[0]), arg[1], atoi(arg[2])); /* uuid, pkgname, userid */
93}
94
95static int do_get_size(char **arg, char reply[REPLY_MAX])
96{
97    int64_t codesize = 0;
98    int64_t datasize = 0;
99    int64_t cachesize = 0;
100    int64_t asecsize = 0;
101    int res = 0;
102
103        /* uuid, pkgdir, userid, apkpath */
104    res = get_size(parse_null(arg[0]), arg[1], atoi(arg[2]), arg[3], arg[4], arg[5], arg[6],
105            arg[7], &codesize, &datasize, &cachesize, &asecsize);
106
107    /*
108     * Each int64_t can take up 22 characters printed out. Make sure it
109     * doesn't go over REPLY_MAX in the future.
110     */
111    snprintf(reply, REPLY_MAX, "%" PRId64 " %" PRId64 " %" PRId64 " %" PRId64,
112            codesize, datasize, cachesize, asecsize);
113    return res;
114}
115
116static int do_rm_user_data(char **arg, char reply[REPLY_MAX] __unused)
117{
118    return delete_user_data(parse_null(arg[0]), arg[1], atoi(arg[2])); /* uuid, pkgname, userid */
119}
120
121static int do_cp_complete_app(char **arg, char reply[REPLY_MAX] __unused)
122{
123    // from_uuid, to_uuid, package_name, data_app_name, appid, seinfo
124    return copy_complete_app(parse_null(arg[0]), parse_null(arg[1]), arg[2], arg[3], atoi(arg[4]), arg[5]);
125}
126
127static int do_mk_user_data(char **arg, char reply[REPLY_MAX] __unused)
128{
129    return make_user_data(parse_null(arg[0]), arg[1], atoi(arg[2]), atoi(arg[3]), arg[4]);
130                             /* uuid, pkgname, uid, userid, seinfo */
131}
132
133static int do_mk_user_config(char **arg, char reply[REPLY_MAX] __unused)
134{
135    return make_user_config(atoi(arg[0])); /* userid */
136}
137
138static int do_rm_user(char **arg, char reply[REPLY_MAX] __unused)
139{
140    return delete_user(parse_null(arg[0]), atoi(arg[1])); /* uuid, userid */
141}
142
143static int do_movefiles(char **arg __unused, char reply[REPLY_MAX] __unused)
144{
145    return movefiles();
146}
147
148static int do_linklib(char **arg, char reply[REPLY_MAX] __unused)
149{
150    return linklib(parse_null(arg[0]), arg[1], arg[2], atoi(arg[3]));
151}
152
153static int do_idmap(char **arg, char reply[REPLY_MAX] __unused)
154{
155    return idmap(arg[0], arg[1], atoi(arg[2]));
156}
157
158static int do_restorecon_data(char **arg, char reply[REPLY_MAX] __attribute__((unused)))
159{
160    return restorecon_data(parse_null(arg[0]), arg[1], arg[2], atoi(arg[3]));
161                             /* uuid, pkgName, seinfo, uid*/
162}
163
164static int do_create_oat_dir(char **arg, char reply[REPLY_MAX] __unused)
165{
166    /* oat_dir, instruction_set */
167    return create_oat_dir(arg[0], arg[1]);
168}
169
170static int do_rm_package_dir(char **arg, char reply[REPLY_MAX] __unused)
171{
172    /* oat_dir */
173    return rm_package_dir(arg[0]);
174}
175
176static int do_link_file(char **arg, char reply[REPLY_MAX] __unused)
177{
178    /* relative_path, from_base, to_base */
179    return link_file(arg[0], arg[1], arg[2]);
180}
181
182struct cmdinfo {
183    const char *name;
184    unsigned numargs;
185    int (*func)(char **arg, char reply[REPLY_MAX]);
186};
187
188struct cmdinfo cmds[] = {
189    { "ping",                 0, do_ping },
190    { "install",              5, do_install },
191    { "dexopt",               7, do_dexopt },
192    { "markbootcomplete",     1, do_mark_boot_complete },
193    { "movedex",              3, do_move_dex },
194    { "rmdex",                2, do_rm_dex },
195    { "remove",               3, do_remove },
196    { "fixuid",               4, do_fixuid },
197    { "freecache",            2, do_free_cache },
198    { "rmcache",              3, do_rm_cache },
199    { "rmcodecache",          3, do_rm_code_cache },
200    { "getsize",              8, do_get_size },
201    { "rmuserdata",           3, do_rm_user_data },
202    { "cpcompleteapp",        6, do_cp_complete_app },
203    { "movefiles",            0, do_movefiles },
204    { "linklib",              4, do_linklib },
205    { "mkuserdata",           5, do_mk_user_data },
206    { "mkuserconfig",         1, do_mk_user_config },
207    { "rmuser",               2, do_rm_user },
208    { "idmap",                3, do_idmap },
209    { "restorecondata",       4, do_restorecon_data },
210    { "createoatdir",         2, do_create_oat_dir },
211    { "rmpackagedir",         1, do_rm_package_dir },
212    { "linkfile",             3, do_link_file }
213};
214
215static int readx(int s, void *_buf, int count)
216{
217    char *buf = (char *) _buf;
218    int n = 0, r;
219    if (count < 0) return -1;
220    while (n < count) {
221        r = read(s, buf + n, count - n);
222        if (r < 0) {
223            if (errno == EINTR) continue;
224            ALOGE("read error: %s\n", strerror(errno));
225            return -1;
226        }
227        if (r == 0) {
228            ALOGE("eof\n");
229            return -1; /* EOF */
230        }
231        n += r;
232    }
233    return 0;
234}
235
236static int writex(int s, const void *_buf, int count)
237{
238    const char *buf = (const char *) _buf;
239    int n = 0, r;
240    if (count < 0) return -1;
241    while (n < count) {
242        r = write(s, buf + n, count - n);
243        if (r < 0) {
244            if (errno == EINTR) continue;
245            ALOGE("write error: %s\n", strerror(errno));
246            return -1;
247        }
248        n += r;
249    }
250    return 0;
251}
252
253
254/* Tokenize the command buffer, locate a matching command,
255 * ensure that the required number of arguments are provided,
256 * call the function(), return the result.
257 */
258static int execute(int s, char cmd[BUFFER_MAX])
259{
260    char reply[REPLY_MAX];
261    char *arg[TOKEN_MAX+1];
262    unsigned i;
263    unsigned n = 0;
264    unsigned short count;
265    int ret = -1;
266
267    // ALOGI("execute('%s')\n", cmd);
268
269        /* default reply is "" */
270    reply[0] = 0;
271
272        /* n is number of args (not counting arg[0]) */
273    arg[0] = cmd;
274    while (*cmd) {
275        if (isspace(*cmd)) {
276            *cmd++ = 0;
277            n++;
278            arg[n] = cmd;
279            if (n == TOKEN_MAX) {
280                ALOGE("too many arguments\n");
281                goto done;
282            }
283        }
284        if (*cmd) {
285          cmd++;
286        }
287    }
288
289    for (i = 0; i < sizeof(cmds) / sizeof(cmds[0]); i++) {
290        if (!strcmp(cmds[i].name,arg[0])) {
291            if (n != cmds[i].numargs) {
292                ALOGE("%s requires %d arguments (%d given)\n",
293                     cmds[i].name, cmds[i].numargs, n);
294            } else {
295                ret = cmds[i].func(arg + 1, reply);
296            }
297            goto done;
298        }
299    }
300    ALOGE("unsupported command '%s'\n", arg[0]);
301
302done:
303    if (reply[0]) {
304        n = snprintf(cmd, BUFFER_MAX, "%d %s", ret, reply);
305    } else {
306        n = snprintf(cmd, BUFFER_MAX, "%d", ret);
307    }
308    if (n > BUFFER_MAX) n = BUFFER_MAX;
309    count = n;
310
311    // ALOGI("reply: '%s'\n", cmd);
312    if (writex(s, &count, sizeof(count))) return -1;
313    if (writex(s, cmd, count)) return -1;
314    return 0;
315}
316
317/**
318 * Initialize all the global variables that are used elsewhere. Returns 0 upon
319 * success and -1 on error.
320 */
321void free_globals() {
322    size_t i;
323
324    for (i = 0; i < android_system_dirs.count; i++) {
325        if (android_system_dirs.dirs[i].path != NULL) {
326            free(android_system_dirs.dirs[i].path);
327        }
328    }
329
330    free(android_system_dirs.dirs);
331}
332
333int initialize_globals() {
334    // Get the android data directory.
335    if (get_path_from_env(&android_data_dir, "ANDROID_DATA") < 0) {
336        return -1;
337    }
338
339    // Get the android app directory.
340    if (copy_and_append(&android_app_dir, &android_data_dir, APP_SUBDIR) < 0) {
341        return -1;
342    }
343
344    // Get the android protected app directory.
345    if (copy_and_append(&android_app_private_dir, &android_data_dir, PRIVATE_APP_SUBDIR) < 0) {
346        return -1;
347    }
348
349    // Get the android ephemeral app directory.
350    if (copy_and_append(&android_app_ephemeral_dir, &android_data_dir, EPHEMERAL_APP_SUBDIR) < 0) {
351        return -1;
352    }
353
354    // Get the android app native library directory.
355    if (copy_and_append(&android_app_lib_dir, &android_data_dir, APP_LIB_SUBDIR) < 0) {
356        return -1;
357    }
358
359    // Get the sd-card ASEC mount point.
360    if (get_path_from_env(&android_asec_dir, "ASEC_MOUNTPOINT") < 0) {
361        return -1;
362    }
363
364    // Get the android media directory.
365    if (copy_and_append(&android_media_dir, &android_data_dir, MEDIA_SUBDIR) < 0) {
366        return -1;
367    }
368
369    // Get the android external app directory.
370    if (get_path_from_string(&android_mnt_expand_dir, "/mnt/expand/") < 0) {
371        return -1;
372    }
373
374    // Take note of the system and vendor directories.
375    android_system_dirs.count = 5;
376
377    android_system_dirs.dirs = (dir_rec_t*) calloc(android_system_dirs.count, sizeof(dir_rec_t));
378    if (android_system_dirs.dirs == NULL) {
379        ALOGE("Couldn't allocate array for dirs; aborting\n");
380        return -1;
381    }
382
383    dir_rec_t android_root_dir;
384    if (get_path_from_env(&android_root_dir, "ANDROID_ROOT") < 0) {
385        ALOGE("Missing ANDROID_ROOT; aborting\n");
386        return -1;
387    }
388
389    android_system_dirs.dirs[0].path = build_string2(android_root_dir.path, APP_SUBDIR);
390    android_system_dirs.dirs[0].len = strlen(android_system_dirs.dirs[0].path);
391
392    android_system_dirs.dirs[1].path = build_string2(android_root_dir.path, PRIV_APP_SUBDIR);
393    android_system_dirs.dirs[1].len = strlen(android_system_dirs.dirs[1].path);
394
395    android_system_dirs.dirs[2].path = strdup("/vendor/app/");
396    android_system_dirs.dirs[2].len = strlen(android_system_dirs.dirs[2].path);
397
398    android_system_dirs.dirs[3].path = strdup("/oem/app/");
399    android_system_dirs.dirs[3].len = strlen(android_system_dirs.dirs[3].path);
400
401    android_system_dirs.dirs[4].path = build_string2(android_root_dir.path, EPHEMERAL_APP_SUBDIR);
402    android_system_dirs.dirs[4].len = strlen(android_system_dirs.dirs[4].path);
403
404    return 0;
405}
406
407int initialize_directories() {
408    int res = -1;
409
410    // Read current filesystem layout version to handle upgrade paths
411    char version_path[PATH_MAX];
412    snprintf(version_path, PATH_MAX, "%s.layout_version", android_data_dir.path);
413
414    int oldVersion;
415    if (fs_read_atomic_int(version_path, &oldVersion) == -1) {
416        oldVersion = 0;
417    }
418    int version = oldVersion;
419
420    // /data/user
421    char *user_data_dir = build_string2(android_data_dir.path, SECONDARY_USER_PREFIX);
422    // /data/data
423    char *legacy_data_dir = build_string2(android_data_dir.path, PRIMARY_USER_PREFIX);
424    // /data/user/0
425    char *primary_data_dir = build_string3(android_data_dir.path, SECONDARY_USER_PREFIX, "0");
426    if (!user_data_dir || !legacy_data_dir || !primary_data_dir) {
427        goto fail;
428    }
429
430    // Make the /data/user directory if necessary
431    if (access(user_data_dir, R_OK) < 0) {
432        if (mkdir(user_data_dir, 0711) < 0) {
433            goto fail;
434        }
435        if (chown(user_data_dir, AID_SYSTEM, AID_SYSTEM) < 0) {
436            goto fail;
437        }
438        if (chmod(user_data_dir, 0711) < 0) {
439            goto fail;
440        }
441    }
442    // Make the /data/user/0 symlink to /data/data if necessary
443    if (access(primary_data_dir, R_OK) < 0) {
444        if (symlink(legacy_data_dir, primary_data_dir)) {
445            goto fail;
446        }
447    }
448
449    if (version == 0) {
450        // Introducing multi-user, so migrate /data/media contents into /data/media/0
451        ALOGD("Upgrading /data/media for multi-user");
452
453        // Ensure /data/media
454        if (fs_prepare_dir(android_media_dir.path, 0770, AID_MEDIA_RW, AID_MEDIA_RW) == -1) {
455            goto fail;
456        }
457
458        // /data/media.tmp
459        char media_tmp_dir[PATH_MAX];
460        snprintf(media_tmp_dir, PATH_MAX, "%smedia.tmp", android_data_dir.path);
461
462        // Only copy when upgrade not already in progress
463        if (access(media_tmp_dir, F_OK) == -1) {
464            if (rename(android_media_dir.path, media_tmp_dir) == -1) {
465                ALOGE("Failed to move legacy media path: %s", strerror(errno));
466                goto fail;
467            }
468        }
469
470        // Create /data/media again
471        if (fs_prepare_dir(android_media_dir.path, 0770, AID_MEDIA_RW, AID_MEDIA_RW) == -1) {
472            goto fail;
473        }
474
475        if (selinux_android_restorecon(android_media_dir.path, 0)) {
476            goto fail;
477        }
478
479        // /data/media/0
480        char owner_media_dir[PATH_MAX];
481        snprintf(owner_media_dir, PATH_MAX, "%s0", android_media_dir.path);
482
483        // Move any owner data into place
484        if (access(media_tmp_dir, F_OK) == 0) {
485            if (rename(media_tmp_dir, owner_media_dir) == -1) {
486                ALOGE("Failed to move owner media path: %s", strerror(errno));
487                goto fail;
488            }
489        }
490
491        // Ensure media directories for any existing users
492        DIR *dir;
493        struct dirent *dirent;
494        char user_media_dir[PATH_MAX];
495
496        dir = opendir(user_data_dir);
497        if (dir != NULL) {
498            while ((dirent = readdir(dir))) {
499                if (dirent->d_type == DT_DIR) {
500                    const char *name = dirent->d_name;
501
502                    // skip "." and ".."
503                    if (name[0] == '.') {
504                        if (name[1] == 0) continue;
505                        if ((name[1] == '.') && (name[2] == 0)) continue;
506                    }
507
508                    // /data/media/<user_id>
509                    snprintf(user_media_dir, PATH_MAX, "%s%s", android_media_dir.path, name);
510                    if (fs_prepare_dir(user_media_dir, 0770, AID_MEDIA_RW, AID_MEDIA_RW) == -1) {
511                        goto fail;
512                    }
513                }
514            }
515            closedir(dir);
516        }
517
518        version = 1;
519    }
520
521    // /data/media/obb
522    char media_obb_dir[PATH_MAX];
523    snprintf(media_obb_dir, PATH_MAX, "%sobb", android_media_dir.path);
524
525    if (version == 1) {
526        // Introducing /data/media/obb for sharing OBB across users; migrate
527        // any existing OBB files from owner.
528        ALOGD("Upgrading to shared /data/media/obb");
529
530        // /data/media/0/Android/obb
531        char owner_obb_path[PATH_MAX];
532        snprintf(owner_obb_path, PATH_MAX, "%s0/Android/obb", android_media_dir.path);
533
534        // Only move if target doesn't already exist
535        if (access(media_obb_dir, F_OK) != 0 && access(owner_obb_path, F_OK) == 0) {
536            if (rename(owner_obb_path, media_obb_dir) == -1) {
537                ALOGE("Failed to move OBB from owner: %s", strerror(errno));
538                goto fail;
539            }
540        }
541
542        version = 2;
543    }
544
545    if (ensure_media_user_dirs(nullptr, 0) == -1) {
546        ALOGE("Failed to setup media for user 0");
547        goto fail;
548    }
549    if (fs_prepare_dir(media_obb_dir, 0770, AID_MEDIA_RW, AID_MEDIA_RW) == -1) {
550        goto fail;
551    }
552
553    if (ensure_config_user_dirs(0) == -1) {
554        ALOGE("Failed to setup misc for user 0");
555        goto fail;
556    }
557
558    if (version == 2) {
559        ALOGD("Upgrading to /data/misc/user directories");
560
561        char misc_dir[PATH_MAX];
562        snprintf(misc_dir, PATH_MAX, "%smisc", android_data_dir.path);
563
564        char keychain_added_dir[PATH_MAX];
565        snprintf(keychain_added_dir, PATH_MAX, "%s/keychain/cacerts-added", misc_dir);
566
567        char keychain_removed_dir[PATH_MAX];
568        snprintf(keychain_removed_dir, PATH_MAX, "%s/keychain/cacerts-removed", misc_dir);
569
570        DIR *dir;
571        struct dirent *dirent;
572        dir = opendir(user_data_dir);
573        if (dir != NULL) {
574            while ((dirent = readdir(dir))) {
575                const char *name = dirent->d_name;
576
577                // skip "." and ".."
578                if (name[0] == '.') {
579                    if (name[1] == 0) continue;
580                    if ((name[1] == '.') && (name[2] == 0)) continue;
581                }
582
583                uint32_t user_id = atoi(name);
584
585                // /data/misc/user/<user_id>
586                if (ensure_config_user_dirs(user_id) == -1) {
587                    goto fail;
588                }
589
590                char misc_added_dir[PATH_MAX];
591                snprintf(misc_added_dir, PATH_MAX, "%s/user/%s/cacerts-added", misc_dir, name);
592
593                char misc_removed_dir[PATH_MAX];
594                snprintf(misc_removed_dir, PATH_MAX, "%s/user/%s/cacerts-removed", misc_dir, name);
595
596                uid_t uid = multiuser_get_uid(user_id, AID_SYSTEM);
597                gid_t gid = uid;
598                if (access(keychain_added_dir, F_OK) == 0) {
599                    if (copy_dir_files(keychain_added_dir, misc_added_dir, uid, gid) != 0) {
600                        ALOGE("Some files failed to copy");
601                    }
602                }
603                if (access(keychain_removed_dir, F_OK) == 0) {
604                    if (copy_dir_files(keychain_removed_dir, misc_removed_dir, uid, gid) != 0) {
605                        ALOGE("Some files failed to copy");
606                    }
607                }
608            }
609            closedir(dir);
610
611            if (access(keychain_added_dir, F_OK) == 0) {
612                delete_dir_contents(keychain_added_dir, 1, 0);
613            }
614            if (access(keychain_removed_dir, F_OK) == 0) {
615                delete_dir_contents(keychain_removed_dir, 1, 0);
616            }
617        }
618
619        version = 3;
620    }
621
622    // Persist layout version if changed
623    if (version != oldVersion) {
624        if (fs_write_atomic_int(version_path, version) == -1) {
625            ALOGE("Failed to save version to %s: %s", version_path, strerror(errno));
626            goto fail;
627        }
628    }
629
630    // Success!
631    res = 0;
632
633fail:
634    free(user_data_dir);
635    free(legacy_data_dir);
636    free(primary_data_dir);
637    return res;
638}
639
640static int log_callback(int type, const char *fmt, ...) {
641    va_list ap;
642    int priority;
643
644    switch (type) {
645    case SELINUX_WARNING:
646        priority = ANDROID_LOG_WARN;
647        break;
648    case SELINUX_INFO:
649        priority = ANDROID_LOG_INFO;
650        break;
651    default:
652        priority = ANDROID_LOG_ERROR;
653        break;
654    }
655    va_start(ap, fmt);
656    LOG_PRI_VA(priority, "SELinux", fmt, ap);
657    va_end(ap);
658    return 0;
659}
660
661int main(const int argc __unused, char *argv[]) {
662    char buf[BUFFER_MAX];
663    struct sockaddr addr;
664    socklen_t alen;
665    int lsocket, s;
666    int selinux_enabled = (is_selinux_enabled() > 0);
667
668    setenv("ANDROID_LOG_TAGS", "*:v", 1);
669    android::base::InitLogging(argv);
670
671    ALOGI("installd firing up\n");
672
673    union selinux_callback cb;
674    cb.func_log = log_callback;
675    selinux_set_callback(SELINUX_CB_LOG, cb);
676
677    if (initialize_globals() < 0) {
678        ALOGE("Could not initialize globals; exiting.\n");
679        exit(1);
680    }
681
682    if (initialize_directories() < 0) {
683        ALOGE("Could not create directories; exiting.\n");
684        exit(1);
685    }
686
687    if (selinux_enabled && selinux_status_open(true) < 0) {
688        ALOGE("Could not open selinux status; exiting.\n");
689        exit(1);
690    }
691
692    lsocket = android_get_control_socket(SOCKET_PATH);
693    if (lsocket < 0) {
694        ALOGE("Failed to get socket from environment: %s\n", strerror(errno));
695        exit(1);
696    }
697    if (listen(lsocket, 5)) {
698        ALOGE("Listen on socket failed: %s\n", strerror(errno));
699        exit(1);
700    }
701    fcntl(lsocket, F_SETFD, FD_CLOEXEC);
702
703    for (;;) {
704        alen = sizeof(addr);
705        s = accept(lsocket, &addr, &alen);
706        if (s < 0) {
707            ALOGE("Accept failed: %s\n", strerror(errno));
708            continue;
709        }
710        fcntl(s, F_SETFD, FD_CLOEXEC);
711
712        ALOGI("new connection\n");
713        for (;;) {
714            unsigned short count;
715            if (readx(s, &count, sizeof(count))) {
716                ALOGE("failed to read size\n");
717                break;
718            }
719            if ((count < 1) || (count >= BUFFER_MAX)) {
720                ALOGE("invalid size %d\n", count);
721                break;
722            }
723            if (readx(s, buf, count)) {
724                ALOGE("failed to read command\n");
725                break;
726            }
727            buf[count] = 0;
728            if (selinux_enabled && selinux_status_updated() > 0) {
729                selinux_android_seapp_context_reload();
730            }
731            if (execute(s, buf)) break;
732        }
733        ALOGI("closing connection\n");
734        close(s);
735    }
736
737    return 0;
738}
739