installd.cpp revision d792118c493806eeb24a8203f508e6e18fe93bd7 
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
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",               9, 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    { "rename",               2, do_rename },
197    { "fixuid",               4, do_fixuid },
198    { "freecache",            2, do_free_cache },
199    { "rmcache",              3, do_rm_cache },
200    { "rmcodecache",          3, do_rm_code_cache },
201    { "getsize",              8, do_get_size },
202    { "rmuserdata",           3, do_rm_user_data },
203    { "mvcompleteapp",        6, do_mv_complete_app },
204    { "movefiles",            0, do_movefiles },
205    { "linklib",              4, do_linklib },
206    { "mkuserdata",           5, do_mk_user_data },
207    { "mkuserconfig",         1, do_mk_user_config },
208    { "rmuser",               2, do_rm_user },
209    { "idmap",                3, do_idmap },
210    { "restorecondata",       4, do_restorecon_data },
211    { "createoatdir",         2, do_create_oat_dir },
212    { "rmpackagedir",         1, do_rm_package_dir},
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 app native library directory.
350    if (copy_and_append(&android_app_lib_dir, &android_data_dir, APP_LIB_SUBDIR) < 0) {
351        return -1;
352    }
353
354    // Get the sd-card ASEC mount point.
355    if (get_path_from_env(&android_asec_dir, "ASEC_MOUNTPOINT") < 0) {
356        return -1;
357    }
358
359    // Get the android media directory.
360    if (copy_and_append(&android_media_dir, &android_data_dir, MEDIA_SUBDIR) < 0) {
361        return -1;
362    }
363
364    // Get the android external app directory.
365    if (get_path_from_string(&android_mnt_expand_dir, "/mnt/expand/") < 0) {
366        return -1;
367    }
368
369    // Take note of the system and vendor directories.
370    android_system_dirs.count = 4;
371
372    android_system_dirs.dirs = (dir_rec_t*) calloc(android_system_dirs.count, sizeof(dir_rec_t));
373    if (android_system_dirs.dirs == NULL) {
374        ALOGE("Couldn't allocate array for dirs; aborting\n");
375        return -1;
376    }
377
378    dir_rec_t android_root_dir;
379    if (get_path_from_env(&android_root_dir, "ANDROID_ROOT") < 0) {
380        ALOGE("Missing ANDROID_ROOT; aborting\n");
381        return -1;
382    }
383
384    android_system_dirs.dirs[0].path = build_string2(android_root_dir.path, APP_SUBDIR);
385    android_system_dirs.dirs[0].len = strlen(android_system_dirs.dirs[0].path);
386
387    android_system_dirs.dirs[1].path = build_string2(android_root_dir.path, PRIV_APP_SUBDIR);
388    android_system_dirs.dirs[1].len = strlen(android_system_dirs.dirs[1].path);
389
390    android_system_dirs.dirs[2].path = strdup("/vendor/app/");
391    android_system_dirs.dirs[2].len = strlen(android_system_dirs.dirs[2].path);
392
393    android_system_dirs.dirs[3].path = strdup("/oem/app/");
394    android_system_dirs.dirs[3].len = strlen(android_system_dirs.dirs[3].path);
395
396    return 0;
397}
398
399int initialize_directories() {
400    int res = -1;
401
402    // Read current filesystem layout version to handle upgrade paths
403    char version_path[PATH_MAX];
404    snprintf(version_path, PATH_MAX, "%s.layout_version", android_data_dir.path);
405
406    int oldVersion;
407    if (fs_read_atomic_int(version_path, &oldVersion) == -1) {
408        oldVersion = 0;
409    }
410    int version = oldVersion;
411
412    // /data/user
413    char *user_data_dir = build_string2(android_data_dir.path, SECONDARY_USER_PREFIX);
414    // /data/data
415    char *legacy_data_dir = build_string2(android_data_dir.path, PRIMARY_USER_PREFIX);
416    // /data/user/0
417    char *primary_data_dir = build_string3(android_data_dir.path, SECONDARY_USER_PREFIX, "0");
418    if (!user_data_dir || !legacy_data_dir || !primary_data_dir) {
419        goto fail;
420    }
421
422    // Make the /data/user directory if necessary
423    if (access(user_data_dir, R_OK) < 0) {
424        if (mkdir(user_data_dir, 0711) < 0) {
425            goto fail;
426        }
427        if (chown(user_data_dir, AID_SYSTEM, AID_SYSTEM) < 0) {
428            goto fail;
429        }
430        if (chmod(user_data_dir, 0711) < 0) {
431            goto fail;
432        }
433    }
434    // Make the /data/user/0 symlink to /data/data if necessary
435    if (access(primary_data_dir, R_OK) < 0) {
436        if (symlink(legacy_data_dir, primary_data_dir)) {
437            goto fail;
438        }
439    }
440
441    if (version == 0) {
442        // Introducing multi-user, so migrate /data/media contents into /data/media/0
443        ALOGD("Upgrading /data/media for multi-user");
444
445        // Ensure /data/media
446        if (fs_prepare_dir(android_media_dir.path, 0770, AID_MEDIA_RW, AID_MEDIA_RW) == -1) {
447            goto fail;
448        }
449
450        // /data/media.tmp
451        char media_tmp_dir[PATH_MAX];
452        snprintf(media_tmp_dir, PATH_MAX, "%smedia.tmp", android_data_dir.path);
453
454        // Only copy when upgrade not already in progress
455        if (access(media_tmp_dir, F_OK) == -1) {
456            if (rename(android_media_dir.path, media_tmp_dir) == -1) {
457                ALOGE("Failed to move legacy media path: %s", strerror(errno));
458                goto fail;
459            }
460        }
461
462        // Create /data/media again
463        if (fs_prepare_dir(android_media_dir.path, 0770, AID_MEDIA_RW, AID_MEDIA_RW) == -1) {
464            goto fail;
465        }
466
467        if (selinux_android_restorecon(android_media_dir.path, 0)) {
468            goto fail;
469        }
470
471        // /data/media/0
472        char owner_media_dir[PATH_MAX];
473        snprintf(owner_media_dir, PATH_MAX, "%s0", android_media_dir.path);
474
475        // Move any owner data into place
476        if (access(media_tmp_dir, F_OK) == 0) {
477            if (rename(media_tmp_dir, owner_media_dir) == -1) {
478                ALOGE("Failed to move owner media path: %s", strerror(errno));
479                goto fail;
480            }
481        }
482
483        // Ensure media directories for any existing users
484        DIR *dir;
485        struct dirent *dirent;
486        char user_media_dir[PATH_MAX];
487
488        dir = opendir(user_data_dir);
489        if (dir != NULL) {
490            while ((dirent = readdir(dir))) {
491                if (dirent->d_type == DT_DIR) {
492                    const char *name = dirent->d_name;
493
494                    // skip "." and ".."
495                    if (name[0] == '.') {
496                        if (name[1] == 0) continue;
497                        if ((name[1] == '.') && (name[2] == 0)) continue;
498                    }
499
500                    // /data/media/<user_id>
501                    snprintf(user_media_dir, PATH_MAX, "%s%s", android_media_dir.path, name);
502                    if (fs_prepare_dir(user_media_dir, 0770, AID_MEDIA_RW, AID_MEDIA_RW) == -1) {
503                        goto fail;
504                    }
505                }
506            }
507            closedir(dir);
508        }
509
510        version = 1;
511    }
512
513    // /data/media/obb
514    char media_obb_dir[PATH_MAX];
515    snprintf(media_obb_dir, PATH_MAX, "%sobb", android_media_dir.path);
516
517    if (version == 1) {
518        // Introducing /data/media/obb for sharing OBB across users; migrate
519        // any existing OBB files from owner.
520        ALOGD("Upgrading to shared /data/media/obb");
521
522        // /data/media/0/Android/obb
523        char owner_obb_path[PATH_MAX];
524        snprintf(owner_obb_path, PATH_MAX, "%s0/Android/obb", android_media_dir.path);
525
526        // Only move if target doesn't already exist
527        if (access(media_obb_dir, F_OK) != 0 && access(owner_obb_path, F_OK) == 0) {
528            if (rename(owner_obb_path, media_obb_dir) == -1) {
529                ALOGE("Failed to move OBB from owner: %s", strerror(errno));
530                goto fail;
531            }
532        }
533
534        version = 2;
535    }
536
537    if (ensure_media_user_dirs(nullptr, 0) == -1) {
538        ALOGE("Failed to setup media for user 0");
539        goto fail;
540    }
541    if (fs_prepare_dir(media_obb_dir, 0770, AID_MEDIA_RW, AID_MEDIA_RW) == -1) {
542        goto fail;
543    }
544
545    if (ensure_config_user_dirs(0) == -1) {
546        ALOGE("Failed to setup misc for user 0");
547        goto fail;
548    }
549
550    if (version == 2) {
551        ALOGD("Upgrading to /data/misc/user directories");
552
553        char misc_dir[PATH_MAX];
554        snprintf(misc_dir, PATH_MAX, "%smisc", android_data_dir.path);
555
556        char keychain_added_dir[PATH_MAX];
557        snprintf(keychain_added_dir, PATH_MAX, "%s/keychain/cacerts-added", misc_dir);
558
559        char keychain_removed_dir[PATH_MAX];
560        snprintf(keychain_removed_dir, PATH_MAX, "%s/keychain/cacerts-removed", misc_dir);
561
562        DIR *dir;
563        struct dirent *dirent;
564        dir = opendir(user_data_dir);
565        if (dir != NULL) {
566            while ((dirent = readdir(dir))) {
567                const char *name = dirent->d_name;
568
569                // skip "." and ".."
570                if (name[0] == '.') {
571                    if (name[1] == 0) continue;
572                    if ((name[1] == '.') && (name[2] == 0)) continue;
573                }
574
575                uint32_t user_id = atoi(name);
576
577                // /data/misc/user/<user_id>
578                if (ensure_config_user_dirs(user_id) == -1) {
579                    goto fail;
580                }
581
582                char misc_added_dir[PATH_MAX];
583                snprintf(misc_added_dir, PATH_MAX, "%s/user/%s/cacerts-added", misc_dir, name);
584
585                char misc_removed_dir[PATH_MAX];
586                snprintf(misc_removed_dir, PATH_MAX, "%s/user/%s/cacerts-removed", misc_dir, name);
587
588                uid_t uid = multiuser_get_uid(user_id, AID_SYSTEM);
589                gid_t gid = uid;
590                if (access(keychain_added_dir, F_OK) == 0) {
591                    if (copy_dir_files(keychain_added_dir, misc_added_dir, uid, gid) != 0) {
592                        ALOGE("Some files failed to copy");
593                    }
594                }
595                if (access(keychain_removed_dir, F_OK) == 0) {
596                    if (copy_dir_files(keychain_removed_dir, misc_removed_dir, uid, gid) != 0) {
597                        ALOGE("Some files failed to copy");
598                    }
599                }
600            }
601            closedir(dir);
602
603            if (access(keychain_added_dir, F_OK) == 0) {
604                delete_dir_contents(keychain_added_dir, 1, 0);
605            }
606            if (access(keychain_removed_dir, F_OK) == 0) {
607                delete_dir_contents(keychain_removed_dir, 1, 0);
608            }
609        }
610
611        version = 3;
612    }
613
614    // Persist layout version if changed
615    if (version != oldVersion) {
616        if (fs_write_atomic_int(version_path, version) == -1) {
617            ALOGE("Failed to save version to %s: %s", version_path, strerror(errno));
618            goto fail;
619        }
620    }
621
622    // Success!
623    res = 0;
624
625fail:
626    free(user_data_dir);
627    free(legacy_data_dir);
628    free(primary_data_dir);
629    return res;
630}
631
632static int log_callback(int type, const char *fmt, ...) {
633    va_list ap;
634    int priority;
635
636    switch (type) {
637    case SELINUX_WARNING:
638        priority = ANDROID_LOG_WARN;
639        break;
640    case SELINUX_INFO:
641        priority = ANDROID_LOG_INFO;
642        break;
643    default:
644        priority = ANDROID_LOG_ERROR;
645        break;
646    }
647    va_start(ap, fmt);
648    LOG_PRI_VA(priority, "SELinux", fmt, ap);
649    va_end(ap);
650    return 0;
651}
652
653int main(const int argc __unused, char *argv[]) {
654    char buf[BUFFER_MAX];
655    struct sockaddr addr;
656    socklen_t alen;
657    int lsocket, s;
658    int selinux_enabled = (is_selinux_enabled() > 0);
659
660    setenv("ANDROID_LOG_TAGS", "*:v", 1);
661    android::base::InitLogging(argv);
662
663    ALOGI("installd firing up\n");
664
665    union selinux_callback cb;
666    cb.func_log = log_callback;
667    selinux_set_callback(SELINUX_CB_LOG, cb);
668
669    if (initialize_globals() < 0) {
670        ALOGE("Could not initialize globals; exiting.\n");
671        exit(1);
672    }
673
674    if (initialize_directories() < 0) {
675        ALOGE("Could not create directories; exiting.\n");
676        exit(1);
677    }
678
679    if (selinux_enabled && selinux_status_open(true) < 0) {
680        ALOGE("Could not open selinux status; exiting.\n");
681        exit(1);
682    }
683
684    lsocket = android_get_control_socket(SOCKET_PATH);
685    if (lsocket < 0) {
686        ALOGE("Failed to get socket from environment: %s\n", strerror(errno));
687        exit(1);
688    }
689    if (listen(lsocket, 5)) {
690        ALOGE("Listen on socket failed: %s\n", strerror(errno));
691        exit(1);
692    }
693    fcntl(lsocket, F_SETFD, FD_CLOEXEC);
694
695    for (;;) {
696        alen = sizeof(addr);
697        s = accept(lsocket, &addr, &alen);
698        if (s < 0) {
699            ALOGE("Accept failed: %s\n", strerror(errno));
700            continue;
701        }
702        fcntl(s, F_SETFD, FD_CLOEXEC);
703
704        ALOGI("new connection\n");
705        for (;;) {
706            unsigned short count;
707            if (readx(s, &count, sizeof(count))) {
708                ALOGE("failed to read size\n");
709                break;
710            }
711            if ((count < 1) || (count >= BUFFER_MAX)) {
712                ALOGE("invalid size %d\n", count);
713                break;
714            }
715            if (readx(s, buf, count)) {
716                ALOGE("failed to read command\n");
717                break;
718            }
719            buf[count] = 0;
720            if (selinux_enabled && selinux_status_updated() > 0) {
721                selinux_android_seapp_context_reload();
722            }
723            if (execute(s, buf)) break;
724        }
725        ALOGI("closing connection\n");
726        close(s);
727    }
728
729    return 0;
730}
731