installd.cpp revision d845c96128a40ca5802c0840ae190fa0af7d4735 
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 <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, is_public, pkgname, instruction_set,
51     * dexopt_needed, vm_safe_mode, debuggable, oat_dir */
52    return dexopt(arg[0], atoi(arg[1]), atoi(arg[2]), arg[3], arg[4], atoi(arg[5]),
53                  atoi(arg[6]), atoi(arg[7]), arg[8]);
54}
55
56static int do_mark_boot_complete(char **arg, char reply[REPLY_MAX] __unused)
57{
58    return mark_boot_complete(arg[0] /* instruction set */);
59}
60
61static int do_move_dex(char **arg, char reply[REPLY_MAX] __unused)
62{
63    return move_dex(arg[0], arg[1], arg[2]); /* src, dst, instruction_set */
64}
65
66static int do_rm_dex(char **arg, char reply[REPLY_MAX] __unused)
67{
68    return rm_dex(arg[0], arg[1]); /* pkgname, instruction_set */
69}
70
71static int do_remove(char **arg, char reply[REPLY_MAX] __unused)
72{
73    return uninstall(parse_null(arg[0]), arg[1], atoi(arg[2])); /* uuid, pkgname, userid */
74}
75
76static int do_rename(char **arg, char reply[REPLY_MAX] __unused)
77{
78    return renamepkg(arg[0], arg[1]); /* oldpkgname, newpkgname */
79}
80
81static int do_fixuid(char **arg, char reply[REPLY_MAX] __unused)
82{
83    return fix_uid(parse_null(arg[0]), arg[1], atoi(arg[2]), atoi(arg[3])); /* uuid, pkgname, uid, gid */
84}
85
86static int do_free_cache(char **arg, char reply[REPLY_MAX] __unused) /* TODO int:free_size */
87{
88    return free_cache(parse_null(arg[0]), (int64_t)atoll(arg[1])); /* uuid, free_size */
89}
90
91static int do_rm_cache(char **arg, char reply[REPLY_MAX] __unused)
92{
93    return delete_cache(parse_null(arg[0]), arg[1], atoi(arg[2])); /* uuid, pkgname, userid */
94}
95
96static int do_rm_code_cache(char **arg, char reply[REPLY_MAX] __unused)
97{
98    return delete_code_cache(parse_null(arg[0]), arg[1], atoi(arg[2])); /* uuid, pkgname, userid */
99}
100
101static int do_get_size(char **arg, char reply[REPLY_MAX])
102{
103    int64_t codesize = 0;
104    int64_t datasize = 0;
105    int64_t cachesize = 0;
106    int64_t asecsize = 0;
107    int res = 0;
108
109        /* uuid, pkgdir, userid, apkpath */
110    res = get_size(parse_null(arg[0]), arg[1], atoi(arg[2]), arg[3], arg[4], arg[5], arg[6],
111            arg[7], &codesize, &datasize, &cachesize, &asecsize);
112
113    /*
114     * Each int64_t can take up 22 characters printed out. Make sure it
115     * doesn't go over REPLY_MAX in the future.
116     */
117    snprintf(reply, REPLY_MAX, "%" PRId64 " %" PRId64 " %" PRId64 " %" PRId64,
118            codesize, datasize, cachesize, asecsize);
119    return res;
120}
121
122static int do_rm_user_data(char **arg, char reply[REPLY_MAX] __unused)
123{
124    return delete_user_data(parse_null(arg[0]), arg[1], atoi(arg[2])); /* uuid, pkgname, userid */
125}
126
127static int do_mv_complete_app(char **arg, char reply[REPLY_MAX] __unused)
128{
129    // from_uuid, to_uuid, package_name, data_app_name, appid, seinfo
130    return move_complete_app(parse_null(arg[0]), parse_null(arg[1]), arg[2], arg[3], atoi(arg[4]), arg[5]);
131}
132
133static int do_mk_user_data(char **arg, char reply[REPLY_MAX] __unused)
134{
135    return make_user_data(parse_null(arg[0]), arg[1], atoi(arg[2]), atoi(arg[3]), arg[4]);
136                             /* uuid, pkgname, uid, userid, seinfo */
137}
138
139static int do_mk_user_config(char **arg, char reply[REPLY_MAX] __unused)
140{
141    return make_user_config(atoi(arg[0])); /* userid */
142}
143
144static int do_rm_user(char **arg, char reply[REPLY_MAX] __unused)
145{
146    return delete_user(parse_null(arg[0]), atoi(arg[1])); /* uuid, userid */
147}
148
149static int do_movefiles(char **arg __unused, char reply[REPLY_MAX] __unused)
150{
151    return movefiles();
152}
153
154static int do_linklib(char **arg, char reply[REPLY_MAX] __unused)
155{
156    return linklib(parse_null(arg[0]), arg[1], arg[2], atoi(arg[3]));
157}
158
159static int do_idmap(char **arg, char reply[REPLY_MAX] __unused)
160{
161    return idmap(arg[0], arg[1], atoi(arg[2]));
162}
163
164static int do_restorecon_data(char **arg, char reply[REPLY_MAX] __attribute__((unused)))
165{
166    return restorecon_data(parse_null(arg[0]), arg[1], arg[2], atoi(arg[3]));
167                             /* uuid, pkgName, seinfo, uid*/
168}
169
170static int do_create_oat_dir(char **arg, char reply[REPLY_MAX] __unused)
171{
172    /* oat_dir, instruction_set */
173    return create_oat_dir(arg[0], arg[1]);
174}
175
176static int do_rm_package_dir(char **arg, char reply[REPLY_MAX] __unused)
177{
178    /* oat_dir */
179    return rm_package_dir(arg[0]);
180}
181
182static int do_link_file(char **arg, char reply[REPLY_MAX] __unused)
183{
184    /* relative_path, from_base, to_base */
185    return link_file(arg[0], arg[1], arg[2]);
186}
187
188struct cmdinfo {
189    const char *name;
190    unsigned numargs;
191    int (*func)(char **arg, char reply[REPLY_MAX]);
192};
193
194struct cmdinfo cmds[] = {
195    { "ping",                 0, do_ping },
196    { "install",              5, do_install },
197    { "dexopt",               9, do_dexopt },
198    { "markbootcomplete",     1, do_mark_boot_complete },
199    { "movedex",              3, do_move_dex },
200    { "rmdex",                2, do_rm_dex },
201    { "remove",               3, do_remove },
202    { "rename",               2, do_rename },
203    { "fixuid",               4, do_fixuid },
204    { "freecache",            2, do_free_cache },
205    { "rmcache",              3, do_rm_cache },
206    { "rmcodecache",          3, do_rm_code_cache },
207    { "getsize",              8, do_get_size },
208    { "rmuserdata",           3, do_rm_user_data },
209    { "mvcompleteapp",        6, do_mv_complete_app },
210    { "movefiles",            0, do_movefiles },
211    { "linklib",              4, do_linklib },
212    { "mkuserdata",           5, do_mk_user_data },
213    { "mkuserconfig",         1, do_mk_user_config },
214    { "rmuser",               2, do_rm_user },
215    { "idmap",                3, do_idmap },
216    { "restorecondata",       4, do_restorecon_data },
217    { "createoatdir",         2, do_create_oat_dir },
218    { "rmpackagedir",         1, do_rm_package_dir },
219    { "linkfile",             3, do_link_file }
220};
221
222static int readx(int s, void *_buf, int count)
223{
224    char *buf = (char *) _buf;
225    int n = 0, r;
226    if (count < 0) return -1;
227    while (n < count) {
228        r = read(s, buf + n, count - n);
229        if (r < 0) {
230            if (errno == EINTR) continue;
231            ALOGE("read error: %s\n", strerror(errno));
232            return -1;
233        }
234        if (r == 0) {
235            ALOGE("eof\n");
236            return -1; /* EOF */
237        }
238        n += r;
239    }
240    return 0;
241}
242
243static int writex(int s, const void *_buf, int count)
244{
245    const char *buf = (const char *) _buf;
246    int n = 0, r;
247    if (count < 0) return -1;
248    while (n < count) {
249        r = write(s, buf + n, count - n);
250        if (r < 0) {
251            if (errno == EINTR) continue;
252            ALOGE("write error: %s\n", strerror(errno));
253            return -1;
254        }
255        n += r;
256    }
257    return 0;
258}
259
260
261/* Tokenize the command buffer, locate a matching command,
262 * ensure that the required number of arguments are provided,
263 * call the function(), return the result.
264 */
265static int execute(int s, char cmd[BUFFER_MAX])
266{
267    char reply[REPLY_MAX];
268    char *arg[TOKEN_MAX+1];
269    unsigned i;
270    unsigned n = 0;
271    unsigned short count;
272    int ret = -1;
273
274    // ALOGI("execute('%s')\n", cmd);
275
276        /* default reply is "" */
277    reply[0] = 0;
278
279        /* n is number of args (not counting arg[0]) */
280    arg[0] = cmd;
281    while (*cmd) {
282        if (isspace(*cmd)) {
283            *cmd++ = 0;
284            n++;
285            arg[n] = cmd;
286            if (n == TOKEN_MAX) {
287                ALOGE("too many arguments\n");
288                goto done;
289            }
290        }
291        if (*cmd) {
292          cmd++;
293        }
294    }
295
296    for (i = 0; i < sizeof(cmds) / sizeof(cmds[0]); i++) {
297        if (!strcmp(cmds[i].name,arg[0])) {
298            if (n != cmds[i].numargs) {
299                ALOGE("%s requires %d arguments (%d given)\n",
300                     cmds[i].name, cmds[i].numargs, n);
301            } else {
302                ret = cmds[i].func(arg + 1, reply);
303            }
304            goto done;
305        }
306    }
307    ALOGE("unsupported command '%s'\n", arg[0]);
308
309done:
310    if (reply[0]) {
311        n = snprintf(cmd, BUFFER_MAX, "%d %s", ret, reply);
312    } else {
313        n = snprintf(cmd, BUFFER_MAX, "%d", ret);
314    }
315    if (n > BUFFER_MAX) n = BUFFER_MAX;
316    count = n;
317
318    // ALOGI("reply: '%s'\n", cmd);
319    if (writex(s, &count, sizeof(count))) return -1;
320    if (writex(s, cmd, count)) return -1;
321    return 0;
322}
323
324/**
325 * Initialize all the global variables that are used elsewhere. Returns 0 upon
326 * success and -1 on error.
327 */
328void free_globals() {
329    size_t i;
330
331    for (i = 0; i < android_system_dirs.count; i++) {
332        if (android_system_dirs.dirs[i].path != NULL) {
333            free(android_system_dirs.dirs[i].path);
334        }
335    }
336
337    free(android_system_dirs.dirs);
338}
339
340int initialize_globals() {
341    // Get the android data directory.
342    if (get_path_from_env(&android_data_dir, "ANDROID_DATA") < 0) {
343        return -1;
344    }
345
346    // Get the android app directory.
347    if (copy_and_append(&android_app_dir, &android_data_dir, APP_SUBDIR) < 0) {
348        return -1;
349    }
350
351    // Get the android protected app directory.
352    if (copy_and_append(&android_app_private_dir, &android_data_dir, PRIVATE_APP_SUBDIR) < 0) {
353        return -1;
354    }
355
356    // Get the android app native library directory.
357    if (copy_and_append(&android_app_lib_dir, &android_data_dir, APP_LIB_SUBDIR) < 0) {
358        return -1;
359    }
360
361    // Get the sd-card ASEC mount point.
362    if (get_path_from_env(&android_asec_dir, "ASEC_MOUNTPOINT") < 0) {
363        return -1;
364    }
365
366    // Get the android media directory.
367    if (copy_and_append(&android_media_dir, &android_data_dir, MEDIA_SUBDIR) < 0) {
368        return -1;
369    }
370
371    // Get the android external app directory.
372    if (get_path_from_string(&android_mnt_expand_dir, "/mnt/expand/") < 0) {
373        return -1;
374    }
375
376    // Take note of the system and vendor directories.
377    android_system_dirs.count = 4;
378
379    android_system_dirs.dirs = (dir_rec_t*) calloc(android_system_dirs.count, sizeof(dir_rec_t));
380    if (android_system_dirs.dirs == NULL) {
381        ALOGE("Couldn't allocate array for dirs; aborting\n");
382        return -1;
383    }
384
385    dir_rec_t android_root_dir;
386    if (get_path_from_env(&android_root_dir, "ANDROID_ROOT") < 0) {
387        ALOGE("Missing ANDROID_ROOT; aborting\n");
388        return -1;
389    }
390
391    android_system_dirs.dirs[0].path = build_string2(android_root_dir.path, APP_SUBDIR);
392    android_system_dirs.dirs[0].len = strlen(android_system_dirs.dirs[0].path);
393
394    android_system_dirs.dirs[1].path = build_string2(android_root_dir.path, PRIV_APP_SUBDIR);
395    android_system_dirs.dirs[1].len = strlen(android_system_dirs.dirs[1].path);
396
397    android_system_dirs.dirs[2].path = strdup("/vendor/app/");
398    android_system_dirs.dirs[2].len = strlen(android_system_dirs.dirs[2].path);
399
400    android_system_dirs.dirs[3].path = strdup("/oem/app/");
401    android_system_dirs.dirs[3].len = strlen(android_system_dirs.dirs[3].path);
402
403    return 0;
404}
405
406int initialize_directories() {
407    int res = -1;
408
409    // Read current filesystem layout version to handle upgrade paths
410    char version_path[PATH_MAX];
411    snprintf(version_path, PATH_MAX, "%s.layout_version", android_data_dir.path);
412
413    int oldVersion;
414    if (fs_read_atomic_int(version_path, &oldVersion) == -1) {
415        oldVersion = 0;
416    }
417    int version = oldVersion;
418
419    // /data/user
420    char *user_data_dir = build_string2(android_data_dir.path, SECONDARY_USER_PREFIX);
421    // /data/data
422    char *legacy_data_dir = build_string2(android_data_dir.path, PRIMARY_USER_PREFIX);
423    // /data/user/0
424    char *primary_data_dir = build_string3(android_data_dir.path, SECONDARY_USER_PREFIX, "0");
425    if (!user_data_dir || !legacy_data_dir || !primary_data_dir) {
426        goto fail;
427    }
428
429    // Make the /data/user directory if necessary
430    if (access(user_data_dir, R_OK) < 0) {
431        if (mkdir(user_data_dir, 0711) < 0) {
432            goto fail;
433        }
434        if (chown(user_data_dir, AID_SYSTEM, AID_SYSTEM) < 0) {
435            goto fail;
436        }
437        if (chmod(user_data_dir, 0711) < 0) {
438            goto fail;
439        }
440    }
441    // Make the /data/user/0 symlink to /data/data if necessary
442    if (access(primary_data_dir, R_OK) < 0) {
443        if (symlink(legacy_data_dir, primary_data_dir)) {
444            goto fail;
445        }
446    }
447
448    if (version == 0) {
449        // Introducing multi-user, so migrate /data/media contents into /data/media/0
450        ALOGD("Upgrading /data/media for multi-user");
451
452        // Ensure /data/media
453        if (fs_prepare_dir(android_media_dir.path, 0770, AID_MEDIA_RW, AID_MEDIA_RW) == -1) {
454            goto fail;
455        }
456
457        // /data/media.tmp
458        char media_tmp_dir[PATH_MAX];
459        snprintf(media_tmp_dir, PATH_MAX, "%smedia.tmp", android_data_dir.path);
460
461        // Only copy when upgrade not already in progress
462        if (access(media_tmp_dir, F_OK) == -1) {
463            if (rename(android_media_dir.path, media_tmp_dir) == -1) {
464                ALOGE("Failed to move legacy media path: %s", strerror(errno));
465                goto fail;
466            }
467        }
468
469        // Create /data/media again
470        if (fs_prepare_dir(android_media_dir.path, 0770, AID_MEDIA_RW, AID_MEDIA_RW) == -1) {
471            goto fail;
472        }
473
474        if (selinux_android_restorecon(android_media_dir.path, 0)) {
475            goto fail;
476        }
477
478        // /data/media/0
479        char owner_media_dir[PATH_MAX];
480        snprintf(owner_media_dir, PATH_MAX, "%s0", android_media_dir.path);
481
482        // Move any owner data into place
483        if (access(media_tmp_dir, F_OK) == 0) {
484            if (rename(media_tmp_dir, owner_media_dir) == -1) {
485                ALOGE("Failed to move owner media path: %s", strerror(errno));
486                goto fail;
487            }
488        }
489
490        // Ensure media directories for any existing users
491        DIR *dir;
492        struct dirent *dirent;
493        char user_media_dir[PATH_MAX];
494
495        dir = opendir(user_data_dir);
496        if (dir != NULL) {
497            while ((dirent = readdir(dir))) {
498                if (dirent->d_type == DT_DIR) {
499                    const char *name = dirent->d_name;
500
501                    // skip "." and ".."
502                    if (name[0] == '.') {
503                        if (name[1] == 0) continue;
504                        if ((name[1] == '.') && (name[2] == 0)) continue;
505                    }
506
507                    // /data/media/<user_id>
508                    snprintf(user_media_dir, PATH_MAX, "%s%s", android_media_dir.path, name);
509                    if (fs_prepare_dir(user_media_dir, 0770, AID_MEDIA_RW, AID_MEDIA_RW) == -1) {
510                        goto fail;
511                    }
512                }
513            }
514            closedir(dir);
515        }
516
517        version = 1;
518    }
519
520    // /data/media/obb
521    char media_obb_dir[PATH_MAX];
522    snprintf(media_obb_dir, PATH_MAX, "%sobb", android_media_dir.path);
523
524    if (version == 1) {
525        // Introducing /data/media/obb for sharing OBB across users; migrate
526        // any existing OBB files from owner.
527        ALOGD("Upgrading to shared /data/media/obb");
528
529        // /data/media/0/Android/obb
530        char owner_obb_path[PATH_MAX];
531        snprintf(owner_obb_path, PATH_MAX, "%s0/Android/obb", android_media_dir.path);
532
533        // Only move if target doesn't already exist
534        if (access(media_obb_dir, F_OK) != 0 && access(owner_obb_path, F_OK) == 0) {
535            if (rename(owner_obb_path, media_obb_dir) == -1) {
536                ALOGE("Failed to move OBB from owner: %s", strerror(errno));
537                goto fail;
538            }
539        }
540
541        version = 2;
542    }
543
544    if (ensure_media_user_dirs(nullptr, 0) == -1) {
545        ALOGE("Failed to setup media for user 0");
546        goto fail;
547    }
548    if (fs_prepare_dir(media_obb_dir, 0770, AID_MEDIA_RW, AID_MEDIA_RW) == -1) {
549        goto fail;
550    }
551
552    if (ensure_config_user_dirs(0) == -1) {
553        ALOGE("Failed to setup misc for user 0");
554        goto fail;
555    }
556
557    if (version == 2) {
558        ALOGD("Upgrading to /data/misc/user directories");
559
560        char misc_dir[PATH_MAX];
561        snprintf(misc_dir, PATH_MAX, "%smisc", android_data_dir.path);
562
563        char keychain_added_dir[PATH_MAX];
564        snprintf(keychain_added_dir, PATH_MAX, "%s/keychain/cacerts-added", misc_dir);
565
566        char keychain_removed_dir[PATH_MAX];
567        snprintf(keychain_removed_dir, PATH_MAX, "%s/keychain/cacerts-removed", misc_dir);
568
569        DIR *dir;
570        struct dirent *dirent;
571        dir = opendir(user_data_dir);
572        if (dir != NULL) {
573            while ((dirent = readdir(dir))) {
574                const char *name = dirent->d_name;
575
576                // skip "." and ".."
577                if (name[0] == '.') {
578                    if (name[1] == 0) continue;
579                    if ((name[1] == '.') && (name[2] == 0)) continue;
580                }
581
582                uint32_t user_id = atoi(name);
583
584                // /data/misc/user/<user_id>
585                if (ensure_config_user_dirs(user_id) == -1) {
586                    goto fail;
587                }
588
589                char misc_added_dir[PATH_MAX];
590                snprintf(misc_added_dir, PATH_MAX, "%s/user/%s/cacerts-added", misc_dir, name);
591
592                char misc_removed_dir[PATH_MAX];
593                snprintf(misc_removed_dir, PATH_MAX, "%s/user/%s/cacerts-removed", misc_dir, name);
594
595                uid_t uid = multiuser_get_uid(user_id, AID_SYSTEM);
596                gid_t gid = uid;
597                if (access(keychain_added_dir, F_OK) == 0) {
598                    if (copy_dir_files(keychain_added_dir, misc_added_dir, uid, gid) != 0) {
599                        ALOGE("Some files failed to copy");
600                    }
601                }
602                if (access(keychain_removed_dir, F_OK) == 0) {
603                    if (copy_dir_files(keychain_removed_dir, misc_removed_dir, uid, gid) != 0) {
604                        ALOGE("Some files failed to copy");
605                    }
606                }
607            }
608            closedir(dir);
609
610            if (access(keychain_added_dir, F_OK) == 0) {
611                delete_dir_contents(keychain_added_dir, 1, 0);
612            }
613            if (access(keychain_removed_dir, F_OK) == 0) {
614                delete_dir_contents(keychain_removed_dir, 1, 0);
615            }
616        }
617
618        version = 3;
619    }
620
621    // Persist layout version if changed
622    if (version != oldVersion) {
623        if (fs_write_atomic_int(version_path, version) == -1) {
624            ALOGE("Failed to save version to %s: %s", version_path, strerror(errno));
625            goto fail;
626        }
627    }
628
629    // Success!
630    res = 0;
631
632fail:
633    free(user_data_dir);
634    free(legacy_data_dir);
635    free(primary_data_dir);
636    return res;
637}
638
639static int log_callback(int type, const char *fmt, ...) {
640    va_list ap;
641    int priority;
642
643    switch (type) {
644    case SELINUX_WARNING:
645        priority = ANDROID_LOG_WARN;
646        break;
647    case SELINUX_INFO:
648        priority = ANDROID_LOG_INFO;
649        break;
650    default:
651        priority = ANDROID_LOG_ERROR;
652        break;
653    }
654    va_start(ap, fmt);
655    LOG_PRI_VA(priority, "SELinux", fmt, ap);
656    va_end(ap);
657    return 0;
658}
659
660int main(const int argc __unused, char *argv[]) {
661    char buf[BUFFER_MAX];
662    struct sockaddr addr;
663    socklen_t alen;
664    int lsocket, s;
665    int selinux_enabled = (is_selinux_enabled() > 0);
666
667    setenv("ANDROID_LOG_TAGS", "*:v", 1);
668    android::base::InitLogging(argv);
669
670    ALOGI("installd firing up\n");
671
672    union selinux_callback cb;
673    cb.func_log = log_callback;
674    selinux_set_callback(SELINUX_CB_LOG, cb);
675
676    if (initialize_globals() < 0) {
677        ALOGE("Could not initialize globals; exiting.\n");
678        exit(1);
679    }
680
681    if (initialize_directories() < 0) {
682        ALOGE("Could not create directories; exiting.\n");
683        exit(1);
684    }
685
686    if (selinux_enabled && selinux_status_open(true) < 0) {
687        ALOGE("Could not open selinux status; exiting.\n");
688        exit(1);
689    }
690
691    lsocket = android_get_control_socket(SOCKET_PATH);
692    if (lsocket < 0) {
693        ALOGE("Failed to get socket from environment: %s\n", strerror(errno));
694        exit(1);
695    }
696    if (listen(lsocket, 5)) {
697        ALOGE("Listen on socket failed: %s\n", strerror(errno));
698        exit(1);
699    }
700    fcntl(lsocket, F_SETFD, FD_CLOEXEC);
701
702    for (;;) {
703        alen = sizeof(addr);
704        s = accept(lsocket, &addr, &alen);
705        if (s < 0) {
706            ALOGE("Accept failed: %s\n", strerror(errno));
707            continue;
708        }
709        fcntl(s, F_SETFD, FD_CLOEXEC);
710
711        ALOGI("new connection\n");
712        for (;;) {
713            unsigned short count;
714            if (readx(s, &count, sizeof(count))) {
715                ALOGE("failed to read size\n");
716                break;
717            }
718            if ((count < 1) || (count >= BUFFER_MAX)) {
719                ALOGE("invalid size %d\n", count);
720                break;
721            }
722            if (readx(s, buf, count)) {
723                ALOGE("failed to read command\n");
724                break;
725            }
726            buf[count] = 0;
727            if (selinux_enabled && selinux_status_updated() > 0) {
728                selinux_android_seapp_context_reload();
729            }
730            if (execute(s, buf)) break;
731        }
732        ALOGI("closing connection\n");
733        close(s);
734    }
735
736    return 0;
737}
738