installd.cpp revision c92fb6247d4c4fbc34c0a5deb26ccf538ca9ec81
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 16 /* max number of arguments in buffer */ 27#define REPLY_MAX 256 /* largest reply allowed */ 28 29static int do_ping(char **arg __unused, char reply[REPLY_MAX] __unused) 30{ 31 return 0; 32} 33 34static int do_install(char **arg, char reply[REPLY_MAX] __unused) 35{ 36 return install(arg[0], atoi(arg[1]), atoi(arg[2]), arg[3]); /* pkgname, uid, gid, seinfo */ 37} 38 39static int do_dexopt(char **arg, char reply[REPLY_MAX] __unused) 40{ 41 /* apk_path, uid, is_public, pkgname, instruction_set, 42 * dexopt_needed, vm_safe_mode, debuggable, oat_dir */ 43 return dexopt(arg[0], atoi(arg[1]), atoi(arg[2]), arg[3], arg[4], atoi(arg[5]), 44 atoi(arg[6]), atoi(arg[7]), arg[8]); 45} 46 47static int do_mark_boot_complete(char **arg, char reply[REPLY_MAX] __unused) 48{ 49 return mark_boot_complete(arg[0] /* instruction set */); 50} 51 52static int do_move_dex(char **arg, char reply[REPLY_MAX] __unused) 53{ 54 return move_dex(arg[0], arg[1], arg[2]); /* src, dst, instruction_set */ 55} 56 57static int do_rm_dex(char **arg, char reply[REPLY_MAX] __unused) 58{ 59 return rm_dex(arg[0], arg[1]); /* pkgname, instruction_set */ 60} 61 62static int do_remove(char **arg, char reply[REPLY_MAX] __unused) 63{ 64 return uninstall(arg[0], atoi(arg[1])); /* pkgname, userid */ 65} 66 67static int do_rename(char **arg, char reply[REPLY_MAX] __unused) 68{ 69 return renamepkg(arg[0], arg[1]); /* oldpkgname, newpkgname */ 70} 71 72static int do_fixuid(char **arg, char reply[REPLY_MAX] __unused) 73{ 74 return fix_uid(arg[0], atoi(arg[1]), atoi(arg[2])); /* pkgname, uid, gid */ 75} 76 77static int do_free_cache(char **arg, char reply[REPLY_MAX] __unused) /* TODO int:free_size */ 78{ 79 return free_cache((int64_t)atoll(arg[0])); /* free_size */ 80} 81 82static int do_rm_cache(char **arg, char reply[REPLY_MAX] __unused) 83{ 84 return delete_cache(arg[0], atoi(arg[1])); /* pkgname, userid */ 85} 86 87static int do_rm_code_cache(char **arg, char reply[REPLY_MAX] __unused) 88{ 89 return delete_code_cache(arg[0], atoi(arg[1])); /* pkgname, userid */ 90} 91 92static int do_get_size(char **arg, char reply[REPLY_MAX]) 93{ 94 int64_t codesize = 0; 95 int64_t datasize = 0; 96 int64_t cachesize = 0; 97 int64_t asecsize = 0; 98 int res = 0; 99 100 /* pkgdir, userid, apkpath */ 101 res = get_size(arg[0], atoi(arg[1]), arg[2], arg[3], arg[4], arg[5], 102 arg[6], &codesize, &datasize, &cachesize, &asecsize); 103 104 /* 105 * Each int64_t can take up 22 characters printed out. Make sure it 106 * doesn't go over REPLY_MAX in the future. 107 */ 108 snprintf(reply, REPLY_MAX, "%" PRId64 " %" PRId64 " %" PRId64 " %" PRId64, 109 codesize, datasize, cachesize, asecsize); 110 return res; 111} 112 113static int do_rm_user_data(char **arg, char reply[REPLY_MAX] __unused) 114{ 115 return delete_user_data(arg[0], atoi(arg[1])); /* pkgname, userid */ 116} 117 118static int do_mk_user_data(char **arg, char reply[REPLY_MAX] __unused) 119{ 120 return make_user_data(arg[0], atoi(arg[1]), atoi(arg[2]), arg[3]); 121 /* pkgname, uid, userid, seinfo */ 122} 123 124static int do_mk_user_config(char **arg, char reply[REPLY_MAX] __unused) 125{ 126 return make_user_config(atoi(arg[0])); /* userid */ 127} 128 129static int do_rm_user(char **arg, char reply[REPLY_MAX] __unused) 130{ 131 return delete_user(atoi(arg[0])); /* userid */ 132} 133 134static int do_movefiles(char **arg __unused, char reply[REPLY_MAX] __unused) 135{ 136 return movefiles(); 137} 138 139static int do_linklib(char **arg, char reply[REPLY_MAX] __unused) 140{ 141 return linklib(arg[0], arg[1], atoi(arg[2])); 142} 143 144static int do_idmap(char **arg, char reply[REPLY_MAX] __unused) 145{ 146 return idmap(arg[0], arg[1], atoi(arg[2])); 147} 148 149static int do_restorecon_data(char **arg, char reply[REPLY_MAX] __attribute__((unused))) 150{ 151 return restorecon_data(arg[0], arg[1], atoi(arg[2])); 152 /* pkgName, seinfo, uid*/ 153} 154 155static int do_create_oat_dir(char **arg, char reply[REPLY_MAX] __unused) 156{ 157 /* oat_dir, instruction_set */ 158 return create_oat_dir(arg[0], arg[1]); 159} 160 161static int do_rm_package_dir(char **arg, char reply[REPLY_MAX] __unused) 162{ 163 /* oat_dir */ 164 return rm_package_dir(arg[0]); 165} 166 167struct cmdinfo { 168 const char *name; 169 unsigned numargs; 170 int (*func)(char **arg, char reply[REPLY_MAX]); 171}; 172 173struct cmdinfo cmds[] = { 174 { "ping", 0, do_ping }, 175 { "install", 4, do_install }, 176 { "dexopt", 9, do_dexopt }, 177 { "markbootcomplete", 1, do_mark_boot_complete }, 178 { "movedex", 3, do_move_dex }, 179 { "rmdex", 2, do_rm_dex }, 180 { "remove", 2, do_remove }, 181 { "rename", 2, do_rename }, 182 { "fixuid", 3, do_fixuid }, 183 { "freecache", 1, do_free_cache }, 184 { "rmcache", 2, do_rm_cache }, 185 { "rmcodecache", 2, do_rm_code_cache }, 186 { "getsize", 7, do_get_size }, 187 { "rmuserdata", 2, do_rm_user_data }, 188 { "movefiles", 0, do_movefiles }, 189 { "linklib", 3, do_linklib }, 190 { "mkuserdata", 4, do_mk_user_data }, 191 { "mkuserconfig", 1, do_mk_user_config }, 192 { "rmuser", 1, do_rm_user }, 193 { "idmap", 3, do_idmap }, 194 { "restorecondata", 3, do_restorecon_data }, 195 { "createoatdir", 2, do_create_oat_dir }, 196 { "rmpackagedir", 1, do_rm_package_dir}, 197}; 198 199static int readx(int s, void *_buf, int count) 200{ 201 char *buf = (char *) _buf; 202 int n = 0, r; 203 if (count < 0) return -1; 204 while (n < count) { 205 r = read(s, buf + n, count - n); 206 if (r < 0) { 207 if (errno == EINTR) continue; 208 ALOGE("read error: %s\n", strerror(errno)); 209 return -1; 210 } 211 if (r == 0) { 212 ALOGE("eof\n"); 213 return -1; /* EOF */ 214 } 215 n += r; 216 } 217 return 0; 218} 219 220static int writex(int s, const void *_buf, int count) 221{ 222 const char *buf = (const char *) _buf; 223 int n = 0, r; 224 if (count < 0) return -1; 225 while (n < count) { 226 r = write(s, buf + n, count - n); 227 if (r < 0) { 228 if (errno == EINTR) continue; 229 ALOGE("write error: %s\n", strerror(errno)); 230 return -1; 231 } 232 n += r; 233 } 234 return 0; 235} 236 237 238/* Tokenize the command buffer, locate a matching command, 239 * ensure that the required number of arguments are provided, 240 * call the function(), return the result. 241 */ 242static int execute(int s, char cmd[BUFFER_MAX]) 243{ 244 char reply[REPLY_MAX]; 245 char *arg[TOKEN_MAX+1]; 246 unsigned i; 247 unsigned n = 0; 248 unsigned short count; 249 int ret = -1; 250 251 // ALOGI("execute('%s')\n", cmd); 252 253 /* default reply is "" */ 254 reply[0] = 0; 255 256 /* n is number of args (not counting arg[0]) */ 257 arg[0] = cmd; 258 while (*cmd) { 259 if (isspace(*cmd)) { 260 *cmd++ = 0; 261 n++; 262 arg[n] = cmd; 263 if (n == TOKEN_MAX) { 264 ALOGE("too many arguments\n"); 265 goto done; 266 } 267 } 268 if (*cmd) { 269 cmd++; 270 } 271 } 272 273 for (i = 0; i < sizeof(cmds) / sizeof(cmds[0]); i++) { 274 if (!strcmp(cmds[i].name,arg[0])) { 275 if (n != cmds[i].numargs) { 276 ALOGE("%s requires %d arguments (%d given)\n", 277 cmds[i].name, cmds[i].numargs, n); 278 } else { 279 ret = cmds[i].func(arg + 1, reply); 280 } 281 goto done; 282 } 283 } 284 ALOGE("unsupported command '%s'\n", arg[0]); 285 286done: 287 if (reply[0]) { 288 n = snprintf(cmd, BUFFER_MAX, "%d %s", ret, reply); 289 } else { 290 n = snprintf(cmd, BUFFER_MAX, "%d", ret); 291 } 292 if (n > BUFFER_MAX) n = BUFFER_MAX; 293 count = n; 294 295 // ALOGI("reply: '%s'\n", cmd); 296 if (writex(s, &count, sizeof(count))) return -1; 297 if (writex(s, cmd, count)) return -1; 298 return 0; 299} 300 301/** 302 * Initialize all the global variables that are used elsewhere. Returns 0 upon 303 * success and -1 on error. 304 */ 305void free_globals() { 306 size_t i; 307 308 for (i = 0; i < android_system_dirs.count; i++) { 309 if (android_system_dirs.dirs[i].path != NULL) { 310 free(android_system_dirs.dirs[i].path); 311 } 312 } 313 314 free(android_system_dirs.dirs); 315} 316 317int initialize_globals() { 318 // Get the android data directory. 319 if (get_path_from_env(&android_data_dir, "ANDROID_DATA") < 0) { 320 return -1; 321 } 322 323 // Get the android app directory. 324 if (copy_and_append(&android_app_dir, &android_data_dir, APP_SUBDIR) < 0) { 325 return -1; 326 } 327 328 // Get the android protected app directory. 329 if (copy_and_append(&android_app_private_dir, &android_data_dir, PRIVATE_APP_SUBDIR) < 0) { 330 return -1; 331 } 332 333 // Get the android app native library directory. 334 if (copy_and_append(&android_app_lib_dir, &android_data_dir, APP_LIB_SUBDIR) < 0) { 335 return -1; 336 } 337 338 // Get the sd-card ASEC mount point. 339 if (get_path_from_env(&android_asec_dir, "ASEC_MOUNTPOINT") < 0) { 340 return -1; 341 } 342 343 // Get the android media directory. 344 if (copy_and_append(&android_media_dir, &android_data_dir, MEDIA_SUBDIR) < 0) { 345 return -1; 346 } 347 348 // Get the android external app directory. 349 if (get_path_from_string(&android_mnt_expand_dir, "/mnt/expand/") < 0) { 350 return -1; 351 } 352 353 // Take note of the system and vendor directories. 354 android_system_dirs.count = 4; 355 356 android_system_dirs.dirs = (dir_rec_t*) calloc(android_system_dirs.count, sizeof(dir_rec_t)); 357 if (android_system_dirs.dirs == NULL) { 358 ALOGE("Couldn't allocate array for dirs; aborting\n"); 359 return -1; 360 } 361 362 dir_rec_t android_root_dir; 363 if (get_path_from_env(&android_root_dir, "ANDROID_ROOT") < 0) { 364 ALOGE("Missing ANDROID_ROOT; aborting\n"); 365 return -1; 366 } 367 368 android_system_dirs.dirs[0].path = build_string2(android_root_dir.path, APP_SUBDIR); 369 android_system_dirs.dirs[0].len = strlen(android_system_dirs.dirs[0].path); 370 371 android_system_dirs.dirs[1].path = build_string2(android_root_dir.path, PRIV_APP_SUBDIR); 372 android_system_dirs.dirs[1].len = strlen(android_system_dirs.dirs[1].path); 373 374 android_system_dirs.dirs[2].path = strdup("/vendor/app/"); 375 android_system_dirs.dirs[2].len = strlen(android_system_dirs.dirs[2].path); 376 377 android_system_dirs.dirs[3].path = strdup("/oem/app/"); 378 android_system_dirs.dirs[3].len = strlen(android_system_dirs.dirs[3].path); 379 380 return 0; 381} 382 383int initialize_directories() { 384 int res = -1; 385 386 // Read current filesystem layout version to handle upgrade paths 387 char version_path[PATH_MAX]; 388 snprintf(version_path, PATH_MAX, "%s.layout_version", android_data_dir.path); 389 390 int oldVersion; 391 if (fs_read_atomic_int(version_path, &oldVersion) == -1) { 392 oldVersion = 0; 393 } 394 int version = oldVersion; 395 396 // /data/user 397 char *user_data_dir = build_string2(android_data_dir.path, SECONDARY_USER_PREFIX); 398 // /data/data 399 char *legacy_data_dir = build_string2(android_data_dir.path, PRIMARY_USER_PREFIX); 400 // /data/user/0 401 char *primary_data_dir = build_string3(android_data_dir.path, SECONDARY_USER_PREFIX, "0"); 402 if (!user_data_dir || !legacy_data_dir || !primary_data_dir) { 403 goto fail; 404 } 405 406 // Make the /data/user directory if necessary 407 if (access(user_data_dir, R_OK) < 0) { 408 if (mkdir(user_data_dir, 0711) < 0) { 409 goto fail; 410 } 411 if (chown(user_data_dir, AID_SYSTEM, AID_SYSTEM) < 0) { 412 goto fail; 413 } 414 if (chmod(user_data_dir, 0711) < 0) { 415 goto fail; 416 } 417 } 418 // Make the /data/user/0 symlink to /data/data if necessary 419 if (access(primary_data_dir, R_OK) < 0) { 420 if (symlink(legacy_data_dir, primary_data_dir)) { 421 goto fail; 422 } 423 } 424 425 if (version == 0) { 426 // Introducing multi-user, so migrate /data/media contents into /data/media/0 427 ALOGD("Upgrading /data/media for multi-user"); 428 429 // Ensure /data/media 430 if (fs_prepare_dir(android_media_dir.path, 0770, AID_MEDIA_RW, AID_MEDIA_RW) == -1) { 431 goto fail; 432 } 433 434 // /data/media.tmp 435 char media_tmp_dir[PATH_MAX]; 436 snprintf(media_tmp_dir, PATH_MAX, "%smedia.tmp", android_data_dir.path); 437 438 // Only copy when upgrade not already in progress 439 if (access(media_tmp_dir, F_OK) == -1) { 440 if (rename(android_media_dir.path, media_tmp_dir) == -1) { 441 ALOGE("Failed to move legacy media path: %s", strerror(errno)); 442 goto fail; 443 } 444 } 445 446 // Create /data/media again 447 if (fs_prepare_dir(android_media_dir.path, 0770, AID_MEDIA_RW, AID_MEDIA_RW) == -1) { 448 goto fail; 449 } 450 451 if (selinux_android_restorecon(android_media_dir.path, 0)) { 452 goto fail; 453 } 454 455 // /data/media/0 456 char owner_media_dir[PATH_MAX]; 457 snprintf(owner_media_dir, PATH_MAX, "%s0", android_media_dir.path); 458 459 // Move any owner data into place 460 if (access(media_tmp_dir, F_OK) == 0) { 461 if (rename(media_tmp_dir, owner_media_dir) == -1) { 462 ALOGE("Failed to move owner media path: %s", strerror(errno)); 463 goto fail; 464 } 465 } 466 467 // Ensure media directories for any existing users 468 DIR *dir; 469 struct dirent *dirent; 470 char user_media_dir[PATH_MAX]; 471 472 dir = opendir(user_data_dir); 473 if (dir != NULL) { 474 while ((dirent = readdir(dir))) { 475 if (dirent->d_type == DT_DIR) { 476 const char *name = dirent->d_name; 477 478 // skip "." and ".." 479 if (name[0] == '.') { 480 if (name[1] == 0) continue; 481 if ((name[1] == '.') && (name[2] == 0)) continue; 482 } 483 484 // /data/media/<user_id> 485 snprintf(user_media_dir, PATH_MAX, "%s%s", android_media_dir.path, name); 486 if (fs_prepare_dir(user_media_dir, 0770, AID_MEDIA_RW, AID_MEDIA_RW) == -1) { 487 goto fail; 488 } 489 } 490 } 491 closedir(dir); 492 } 493 494 version = 1; 495 } 496 497 // /data/media/obb 498 char media_obb_dir[PATH_MAX]; 499 snprintf(media_obb_dir, PATH_MAX, "%sobb", android_media_dir.path); 500 501 if (version == 1) { 502 // Introducing /data/media/obb for sharing OBB across users; migrate 503 // any existing OBB files from owner. 504 ALOGD("Upgrading to shared /data/media/obb"); 505 506 // /data/media/0/Android/obb 507 char owner_obb_path[PATH_MAX]; 508 snprintf(owner_obb_path, PATH_MAX, "%s0/Android/obb", android_media_dir.path); 509 510 // Only move if target doesn't already exist 511 if (access(media_obb_dir, F_OK) != 0 && access(owner_obb_path, F_OK) == 0) { 512 if (rename(owner_obb_path, media_obb_dir) == -1) { 513 ALOGE("Failed to move OBB from owner: %s", strerror(errno)); 514 goto fail; 515 } 516 } 517 518 version = 2; 519 } 520 521 if (ensure_media_user_dirs(0) == -1) { 522 ALOGE("Failed to setup media for user 0"); 523 goto fail; 524 } 525 if (fs_prepare_dir(media_obb_dir, 0770, AID_MEDIA_RW, AID_MEDIA_RW) == -1) { 526 goto fail; 527 } 528 529 if (ensure_config_user_dirs(0) == -1) { 530 ALOGE("Failed to setup misc for user 0"); 531 goto fail; 532 } 533 534 if (version == 2) { 535 ALOGD("Upgrading to /data/misc/user directories"); 536 537 char misc_dir[PATH_MAX]; 538 snprintf(misc_dir, PATH_MAX, "%smisc", android_data_dir.path); 539 540 char keychain_added_dir[PATH_MAX]; 541 snprintf(keychain_added_dir, PATH_MAX, "%s/keychain/cacerts-added", misc_dir); 542 543 char keychain_removed_dir[PATH_MAX]; 544 snprintf(keychain_removed_dir, PATH_MAX, "%s/keychain/cacerts-removed", misc_dir); 545 546 DIR *dir; 547 struct dirent *dirent; 548 dir = opendir(user_data_dir); 549 if (dir != NULL) { 550 while ((dirent = readdir(dir))) { 551 const char *name = dirent->d_name; 552 553 // skip "." and ".." 554 if (name[0] == '.') { 555 if (name[1] == 0) continue; 556 if ((name[1] == '.') && (name[2] == 0)) continue; 557 } 558 559 uint32_t user_id = atoi(name); 560 561 // /data/misc/user/<user_id> 562 if (ensure_config_user_dirs(user_id) == -1) { 563 goto fail; 564 } 565 566 char misc_added_dir[PATH_MAX]; 567 snprintf(misc_added_dir, PATH_MAX, "%s/user/%s/cacerts-added", misc_dir, name); 568 569 char misc_removed_dir[PATH_MAX]; 570 snprintf(misc_removed_dir, PATH_MAX, "%s/user/%s/cacerts-removed", misc_dir, name); 571 572 uid_t uid = multiuser_get_uid(user_id, AID_SYSTEM); 573 gid_t gid = uid; 574 if (access(keychain_added_dir, F_OK) == 0) { 575 if (copy_dir_files(keychain_added_dir, misc_added_dir, uid, gid) != 0) { 576 ALOGE("Some files failed to copy"); 577 } 578 } 579 if (access(keychain_removed_dir, F_OK) == 0) { 580 if (copy_dir_files(keychain_removed_dir, misc_removed_dir, uid, gid) != 0) { 581 ALOGE("Some files failed to copy"); 582 } 583 } 584 } 585 closedir(dir); 586 587 if (access(keychain_added_dir, F_OK) == 0) { 588 delete_dir_contents(keychain_added_dir, 1, 0); 589 } 590 if (access(keychain_removed_dir, F_OK) == 0) { 591 delete_dir_contents(keychain_removed_dir, 1, 0); 592 } 593 } 594 595 version = 3; 596 } 597 598 // Persist layout version if changed 599 if (version != oldVersion) { 600 if (fs_write_atomic_int(version_path, version) == -1) { 601 ALOGE("Failed to save version to %s: %s", version_path, strerror(errno)); 602 goto fail; 603 } 604 } 605 606 // Success! 607 res = 0; 608 609fail: 610 free(user_data_dir); 611 free(legacy_data_dir); 612 free(primary_data_dir); 613 return res; 614} 615 616static void drop_privileges() { 617 if (prctl(PR_SET_KEEPCAPS, 1) < 0) { 618 ALOGE("prctl(PR_SET_KEEPCAPS) failed: %s\n", strerror(errno)); 619 exit(1); 620 } 621 622 if (setgid(AID_INSTALL) < 0) { 623 ALOGE("setgid() can't drop privileges; exiting.\n"); 624 exit(1); 625 } 626 627 if (setuid(AID_INSTALL) < 0) { 628 ALOGE("setuid() can't drop privileges; exiting.\n"); 629 exit(1); 630 } 631 632 struct __user_cap_header_struct capheader; 633 struct __user_cap_data_struct capdata[2]; 634 memset(&capheader, 0, sizeof(capheader)); 635 memset(&capdata, 0, sizeof(capdata)); 636 capheader.version = _LINUX_CAPABILITY_VERSION_3; 637 capheader.pid = 0; 638 639 capdata[CAP_TO_INDEX(CAP_DAC_OVERRIDE)].permitted |= CAP_TO_MASK(CAP_DAC_OVERRIDE); 640 capdata[CAP_TO_INDEX(CAP_CHOWN)].permitted |= CAP_TO_MASK(CAP_CHOWN); 641 capdata[CAP_TO_INDEX(CAP_SETUID)].permitted |= CAP_TO_MASK(CAP_SETUID); 642 capdata[CAP_TO_INDEX(CAP_SETGID)].permitted |= CAP_TO_MASK(CAP_SETGID); 643 capdata[CAP_TO_INDEX(CAP_FOWNER)].permitted |= CAP_TO_MASK(CAP_FOWNER); 644 645 capdata[0].effective = capdata[0].permitted; 646 capdata[1].effective = capdata[1].permitted; 647 capdata[0].inheritable = 0; 648 capdata[1].inheritable = 0; 649 650 if (capset(&capheader, &capdata[0]) < 0) { 651 ALOGE("capset failed: %s\n", strerror(errno)); 652 exit(1); 653 } 654} 655 656static int log_callback(int type, const char *fmt, ...) { 657 va_list ap; 658 int priority; 659 660 switch (type) { 661 case SELINUX_WARNING: 662 priority = ANDROID_LOG_WARN; 663 break; 664 case SELINUX_INFO: 665 priority = ANDROID_LOG_INFO; 666 break; 667 default: 668 priority = ANDROID_LOG_ERROR; 669 break; 670 } 671 va_start(ap, fmt); 672 LOG_PRI_VA(priority, "SELinux", fmt, ap); 673 va_end(ap); 674 return 0; 675} 676 677int main(const int argc __unused, const char *argv[] __unused) { 678 char buf[BUFFER_MAX]; 679 struct sockaddr addr; 680 socklen_t alen; 681 int lsocket, s; 682 int selinux_enabled = (is_selinux_enabled() > 0); 683 684 ALOGI("installd firing up\n"); 685 686 union selinux_callback cb; 687 cb.func_log = log_callback; 688 selinux_set_callback(SELINUX_CB_LOG, cb); 689 690 if (initialize_globals() < 0) { 691 ALOGE("Could not initialize globals; exiting.\n"); 692 exit(1); 693 } 694 695 if (initialize_directories() < 0) { 696 ALOGE("Could not create directories; exiting.\n"); 697 exit(1); 698 } 699 700 if (selinux_enabled && selinux_status_open(true) < 0) { 701 ALOGE("Could not open selinux status; exiting.\n"); 702 exit(1); 703 } 704 705 drop_privileges(); 706 707 lsocket = android_get_control_socket(SOCKET_PATH); 708 if (lsocket < 0) { 709 ALOGE("Failed to get socket from environment: %s\n", strerror(errno)); 710 exit(1); 711 } 712 if (listen(lsocket, 5)) { 713 ALOGE("Listen on socket failed: %s\n", strerror(errno)); 714 exit(1); 715 } 716 fcntl(lsocket, F_SETFD, FD_CLOEXEC); 717 718 for (;;) { 719 alen = sizeof(addr); 720 s = accept(lsocket, &addr, &alen); 721 if (s < 0) { 722 ALOGE("Accept failed: %s\n", strerror(errno)); 723 continue; 724 } 725 fcntl(s, F_SETFD, FD_CLOEXEC); 726 727 ALOGI("new connection\n"); 728 for (;;) { 729 unsigned short count; 730 if (readx(s, &count, sizeof(count))) { 731 ALOGE("failed to read size\n"); 732 break; 733 } 734 if ((count < 1) || (count >= BUFFER_MAX)) { 735 ALOGE("invalid size %d\n", count); 736 break; 737 } 738 if (readx(s, buf, count)) { 739 ALOGE("failed to read command\n"); 740 break; 741 } 742 buf[count] = 0; 743 if (selinux_enabled && selinux_status_updated() > 0) { 744 selinux_android_seapp_context_reload(); 745 } 746 if (execute(s, buf)) break; 747 } 748 ALOGI("closing connection\n"); 749 close(s); 750 } 751 752 return 0; 753} 754