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