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