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 #include <diskusage/dirsize.h> 19 20 /* Directory records that are used in execution of commands. */ 21 dir_rec_t android_data_dir; 22 dir_rec_t android_asec_dir; 23 dir_rec_t android_app_dir; 24 dir_rec_t android_app_private_dir; 25 dir_rec_array_t android_system_dirs; 26 27 int install(const char *pkgname, uid_t uid, gid_t gid) 28 { 29 char pkgdir[PKG_PATH_MAX]; 30 char libdir[PKG_PATH_MAX]; 31 32 if ((uid < AID_SYSTEM) || (gid < AID_SYSTEM)) { 33 ALOGE("invalid uid/gid: %d %d\n", uid, gid); 34 return -1; 35 } 36 37 if (create_pkg_path(pkgdir, pkgname, PKG_DIR_POSTFIX, 0)) { 38 ALOGE("cannot create package path\n"); 39 return -1; 40 } 41 42 if (create_pkg_path(libdir, pkgname, PKG_LIB_POSTFIX, 0)) { 43 ALOGE("cannot create package lib path\n"); 44 return -1; 45 } 46 47 if (mkdir(pkgdir, 0751) < 0) { 48 ALOGE("cannot create dir '%s': %s\n", pkgdir, strerror(errno)); 49 return -errno; 50 } 51 if (chmod(pkgdir, 0751) < 0) { 52 ALOGE("cannot chmod dir '%s': %s\n", pkgdir, strerror(errno)); 53 unlink(pkgdir); 54 return -errno; 55 } 56 57 if (mkdir(libdir, 0755) < 0) { 58 ALOGE("cannot create dir '%s': %s\n", libdir, strerror(errno)); 59 unlink(pkgdir); 60 return -errno; 61 } 62 if (chmod(libdir, 0755) < 0) { 63 ALOGE("cannot chmod dir '%s': %s\n", libdir, strerror(errno)); 64 unlink(libdir); 65 unlink(pkgdir); 66 return -errno; 67 } 68 if (chown(libdir, AID_SYSTEM, AID_SYSTEM) < 0) { 69 ALOGE("cannot chown dir '%s': %s\n", libdir, strerror(errno)); 70 unlink(libdir); 71 unlink(pkgdir); 72 return -errno; 73 } 74 75 if (chown(pkgdir, uid, gid) < 0) { 76 ALOGE("cannot chown dir '%s': %s\n", pkgdir, strerror(errno)); 77 unlink(libdir); 78 unlink(pkgdir); 79 return -errno; 80 } 81 return 0; 82 } 83 84 int uninstall(const char *pkgname, uid_t persona) 85 { 86 char pkgdir[PKG_PATH_MAX]; 87 88 if (create_pkg_path(pkgdir, pkgname, PKG_DIR_POSTFIX, persona)) 89 return -1; 90 91 /* delete contents AND directory, no exceptions */ 92 return delete_dir_contents(pkgdir, 1, NULL); 93 } 94 95 int renamepkg(const char *oldpkgname, const char *newpkgname) 96 { 97 char oldpkgdir[PKG_PATH_MAX]; 98 char newpkgdir[PKG_PATH_MAX]; 99 100 if (create_pkg_path(oldpkgdir, oldpkgname, PKG_DIR_POSTFIX, 0)) 101 return -1; 102 if (create_pkg_path(newpkgdir, newpkgname, PKG_DIR_POSTFIX, 0)) 103 return -1; 104 105 if (rename(oldpkgdir, newpkgdir) < 0) { 106 ALOGE("cannot rename dir '%s' to '%s': %s\n", oldpkgdir, newpkgdir, strerror(errno)); 107 return -errno; 108 } 109 return 0; 110 } 111 112 int fix_uid(const char *pkgname, uid_t uid, gid_t gid) 113 { 114 char pkgdir[PKG_PATH_MAX]; 115 struct stat s; 116 int rc = 0; 117 118 if ((uid < AID_SYSTEM) || (gid < AID_SYSTEM)) { 119 ALOGE("invalid uid/gid: %d %d\n", uid, gid); 120 return -1; 121 } 122 123 if (create_pkg_path(pkgdir, pkgname, PKG_DIR_POSTFIX, 0)) { 124 ALOGE("cannot create package path\n"); 125 return -1; 126 } 127 128 if (stat(pkgdir, &s) < 0) return -1; 129 130 if (s.st_uid != 0 || s.st_gid != 0) { 131 ALOGE("fixing uid of non-root pkg: %s %d %d\n", pkgdir, s.st_uid, s.st_gid); 132 return -1; 133 } 134 135 if (chmod(pkgdir, 0751) < 0) { 136 ALOGE("cannot chmod dir '%s': %s\n", pkgdir, strerror(errno)); 137 unlink(pkgdir); 138 return -errno; 139 } 140 if (chown(pkgdir, uid, gid) < 0) { 141 ALOGE("cannot chown dir '%s': %s\n", pkgdir, strerror(errno)); 142 unlink(pkgdir); 143 return -errno; 144 } 145 146 return 0; 147 } 148 149 int delete_user_data(const char *pkgname, uid_t persona) 150 { 151 char pkgdir[PKG_PATH_MAX]; 152 153 if (create_pkg_path(pkgdir, pkgname, PKG_DIR_POSTFIX, persona)) 154 return -1; 155 156 /* delete contents, excluding "lib", but not the directory itself */ 157 return delete_dir_contents(pkgdir, 0, "lib"); 158 } 159 160 int make_user_data(const char *pkgname, uid_t uid, uid_t persona) 161 { 162 char pkgdir[PKG_PATH_MAX]; 163 char real_libdir[PKG_PATH_MAX]; 164 165 // Create the data dir for the package 166 if (create_pkg_path(pkgdir, pkgname, PKG_DIR_POSTFIX, persona)) { 167 return -1; 168 } 169 if (mkdir(pkgdir, 0751) < 0) { 170 ALOGE("cannot create dir '%s': %s\n", pkgdir, strerror(errno)); 171 return -errno; 172 } 173 if (chown(pkgdir, uid, uid) < 0) { 174 ALOGE("cannot chown dir '%s': %s\n", pkgdir, strerror(errno)); 175 unlink(pkgdir); 176 return -errno; 177 } 178 return 0; 179 } 180 181 int delete_persona(uid_t persona) 182 { 183 char pkgdir[PKG_PATH_MAX]; 184 185 if (create_persona_path(pkgdir, persona)) 186 return -1; 187 188 return delete_dir_contents(pkgdir, 1, NULL); 189 } 190 191 int clone_persona_data(uid_t src_persona, uid_t target_persona, int copy) 192 { 193 char src_data_dir[PKG_PATH_MAX]; 194 char pkg_path[PKG_PATH_MAX]; 195 DIR *d; 196 struct dirent *de; 197 struct stat s; 198 uid_t uid; 199 200 if (create_persona_path(src_data_dir, src_persona)) { 201 return -1; 202 } 203 204 d = opendir(src_data_dir); 205 if (d != NULL) { 206 while ((de = readdir(d))) { 207 const char *name = de->d_name; 208 209 if (de->d_type == DT_DIR) { 210 int subfd; 211 /* always skip "." and ".." */ 212 if (name[0] == '.') { 213 if (name[1] == 0) continue; 214 if ((name[1] == '.') && (name[2] == 0)) continue; 215 } 216 /* Create the full path to the package's data dir */ 217 create_pkg_path(pkg_path, name, PKG_DIR_POSTFIX, src_persona); 218 /* Get the file stat */ 219 if (stat(pkg_path, &s) < 0) continue; 220 /* Get the uid of the package */ 221 ALOGI("Adding datadir for uid = %d\n", s.st_uid); 222 uid = (uid_t) s.st_uid % PER_USER_RANGE; 223 /* Create the directory for the target */ 224 make_user_data(name, uid + target_persona * PER_USER_RANGE, 225 target_persona); 226 } 227 } 228 closedir(d); 229 } 230 return 0; 231 } 232 233 int delete_cache(const char *pkgname) 234 { 235 char cachedir[PKG_PATH_MAX]; 236 237 if (create_pkg_path(cachedir, pkgname, CACHE_DIR_POSTFIX, 0)) 238 return -1; 239 240 /* delete contents, not the directory, no exceptions */ 241 return delete_dir_contents(cachedir, 0, 0); 242 } 243 244 static int64_t disk_free() 245 { 246 struct statfs sfs; 247 if (statfs(android_data_dir.path, &sfs) == 0) { 248 return sfs.f_bavail * sfs.f_bsize; 249 } else { 250 ALOGE("Couldn't statfs %s: %s\n", android_data_dir.path, strerror(errno)); 251 return -1; 252 } 253 } 254 255 /* Try to ensure free_size bytes of storage are available. 256 * Returns 0 on success. 257 * This is rather simple-minded because doing a full LRU would 258 * be potentially memory-intensive, and without atime it would 259 * also require that apps constantly modify file metadata even 260 * when just reading from the cache, which is pretty awful. 261 */ 262 int free_cache(int64_t free_size) 263 { 264 const char *name; 265 int dfd, subfd; 266 DIR *d; 267 struct dirent *de; 268 int64_t avail; 269 char datadir[PKG_PATH_MAX]; 270 271 avail = disk_free(); 272 if (avail < 0) return -1; 273 274 ALOGI("free_cache(%" PRId64 ") avail %" PRId64 "\n", free_size, avail); 275 if (avail >= free_size) return 0; 276 277 if (create_persona_path(datadir, 0)) { 278 ALOGE("couldn't get directory for persona 0"); 279 return -1; 280 } 281 282 d = opendir(datadir); 283 if (d == NULL) { 284 ALOGE("cannot open %s: %s\n", datadir, strerror(errno)); 285 return -1; 286 } 287 dfd = dirfd(d); 288 289 while ((de = readdir(d))) { 290 if (de->d_type != DT_DIR) continue; 291 name = de->d_name; 292 293 /* always skip "." and ".." */ 294 if (name[0] == '.') { 295 if (name[1] == 0) continue; 296 if ((name[1] == '.') && (name[2] == 0)) continue; 297 } 298 299 subfd = openat(dfd, name, O_RDONLY | O_DIRECTORY); 300 if (subfd < 0) continue; 301 302 delete_dir_contents_fd(subfd, "cache"); 303 close(subfd); 304 305 avail = disk_free(); 306 if (avail >= free_size) { 307 closedir(d); 308 return 0; 309 } 310 } 311 closedir(d); 312 313 /* Fail case - not possible to free space */ 314 return -1; 315 } 316 317 int move_dex(const char *src, const char *dst) 318 { 319 char src_dex[PKG_PATH_MAX]; 320 char dst_dex[PKG_PATH_MAX]; 321 322 if (validate_apk_path(src)) return -1; 323 if (validate_apk_path(dst)) return -1; 324 325 if (create_cache_path(src_dex, src)) return -1; 326 if (create_cache_path(dst_dex, dst)) return -1; 327 328 ALOGV("move %s -> %s\n", src_dex, dst_dex); 329 if (rename(src_dex, dst_dex) < 0) { 330 ALOGE("Couldn't move %s: %s\n", src_dex, strerror(errno)); 331 return -1; 332 } else { 333 return 0; 334 } 335 } 336 337 int rm_dex(const char *path) 338 { 339 char dex_path[PKG_PATH_MAX]; 340 341 if (validate_apk_path(path)) return -1; 342 if (create_cache_path(dex_path, path)) return -1; 343 344 ALOGV("unlink %s\n", dex_path); 345 if (unlink(dex_path) < 0) { 346 ALOGE("Couldn't unlink %s: %s\n", dex_path, strerror(errno)); 347 return -1; 348 } else { 349 return 0; 350 } 351 } 352 353 int protect(char *pkgname, gid_t gid) 354 { 355 struct stat s; 356 char pkgpath[PKG_PATH_MAX]; 357 358 if (gid < AID_SYSTEM) return -1; 359 360 if (create_pkg_path_in_dir(pkgpath, &android_app_private_dir, pkgname, ".apk")) 361 return -1; 362 363 if (stat(pkgpath, &s) < 0) return -1; 364 365 if (chown(pkgpath, s.st_uid, gid) < 0) { 366 ALOGE("failed to chgrp '%s': %s\n", pkgpath, strerror(errno)); 367 return -1; 368 } 369 370 if (chmod(pkgpath, S_IRUSR|S_IWUSR|S_IRGRP) < 0) { 371 ALOGE("failed to chmod '%s': %s\n", pkgpath, strerror(errno)); 372 return -1; 373 } 374 375 return 0; 376 } 377 378 int get_size(const char *pkgname, const char *apkpath, 379 const char *fwdlock_apkpath, const char *asecpath, 380 int64_t *_codesize, int64_t *_datasize, int64_t *_cachesize, 381 int64_t* _asecsize) 382 { 383 DIR *d; 384 int dfd; 385 struct dirent *de; 386 struct stat s; 387 char path[PKG_PATH_MAX]; 388 389 int64_t codesize = 0; 390 int64_t datasize = 0; 391 int64_t cachesize = 0; 392 int64_t asecsize = 0; 393 394 /* count the source apk as code -- but only if it's not 395 * on the /system partition and its not on the sdcard. 396 */ 397 if (validate_system_app_path(apkpath) && 398 strncmp(apkpath, android_asec_dir.path, android_asec_dir.len) != 0) { 399 if (stat(apkpath, &s) == 0) { 400 codesize += stat_size(&s); 401 } 402 } 403 /* count the forward locked apk as code if it is given 404 */ 405 if (fwdlock_apkpath != NULL && fwdlock_apkpath[0] != '!') { 406 if (stat(fwdlock_apkpath, &s) == 0) { 407 codesize += stat_size(&s); 408 } 409 } 410 /* count the cached dexfile as code */ 411 if (!create_cache_path(path, apkpath)) { 412 if (stat(path, &s) == 0) { 413 codesize += stat_size(&s); 414 } 415 } 416 417 /* compute asec size if it is given 418 */ 419 if (asecpath != NULL && asecpath[0] != '!') { 420 if (stat(asecpath, &s) == 0) { 421 asecsize += stat_size(&s); 422 } 423 } 424 425 if (create_pkg_path(path, pkgname, PKG_DIR_POSTFIX, 0)) { 426 goto done; 427 } 428 429 d = opendir(path); 430 if (d == NULL) { 431 goto done; 432 } 433 dfd = dirfd(d); 434 435 /* most stuff in the pkgdir is data, except for the "cache" 436 * directory and below, which is cache, and the "lib" directory 437 * and below, which is code... 438 */ 439 while ((de = readdir(d))) { 440 const char *name = de->d_name; 441 442 if (de->d_type == DT_DIR) { 443 int subfd; 444 /* always skip "." and ".." */ 445 if (name[0] == '.') { 446 if (name[1] == 0) continue; 447 if ((name[1] == '.') && (name[2] == 0)) continue; 448 } 449 subfd = openat(dfd, name, O_RDONLY | O_DIRECTORY); 450 if (subfd >= 0) { 451 int64_t size = calculate_dir_size(subfd); 452 if (!strcmp(name,"lib")) { 453 codesize += size; 454 } else if(!strcmp(name,"cache")) { 455 cachesize += size; 456 } else { 457 datasize += size; 458 } 459 } 460 } else { 461 if (fstatat(dfd, name, &s, AT_SYMLINK_NOFOLLOW) == 0) { 462 datasize += stat_size(&s); 463 } 464 } 465 } 466 closedir(d); 467 done: 468 *_codesize = codesize; 469 *_datasize = datasize; 470 *_cachesize = cachesize; 471 *_asecsize = asecsize; 472 return 0; 473 } 474 475 476 /* a simpler version of dexOptGenerateCacheFileName() */ 477 int create_cache_path(char path[PKG_PATH_MAX], const char *src) 478 { 479 char *tmp; 480 int srclen; 481 int dstlen; 482 483 srclen = strlen(src); 484 485 /* demand that we are an absolute path */ 486 if ((src == 0) || (src[0] != '/') || strstr(src,"..")) { 487 return -1; 488 } 489 490 if (srclen > PKG_PATH_MAX) { // XXX: PKG_NAME_MAX? 491 return -1; 492 } 493 494 dstlen = srclen + strlen(DALVIK_CACHE_PREFIX) + 495 strlen(DALVIK_CACHE_POSTFIX) + 1; 496 497 if (dstlen > PKG_PATH_MAX) { 498 return -1; 499 } 500 501 sprintf(path,"%s%s%s", 502 DALVIK_CACHE_PREFIX, 503 src + 1, /* skip the leading / */ 504 DALVIK_CACHE_POSTFIX); 505 506 for(tmp = path + strlen(DALVIK_CACHE_PREFIX); *tmp; tmp++) { 507 if (*tmp == '/') { 508 *tmp = '@'; 509 } 510 } 511 512 return 0; 513 } 514 515 static void run_dexopt(int zip_fd, int odex_fd, const char* input_file_name, 516 const char* dexopt_flags) 517 { 518 static const char* DEX_OPT_BIN = "/system/bin/dexopt"; 519 static const int MAX_INT_LEN = 12; // '-'+10dig+'\0' -OR- 0x+8dig 520 char zip_num[MAX_INT_LEN]; 521 char odex_num[MAX_INT_LEN]; 522 523 sprintf(zip_num, "%d", zip_fd); 524 sprintf(odex_num, "%d", odex_fd); 525 526 execl(DEX_OPT_BIN, DEX_OPT_BIN, "--zip", zip_num, odex_num, input_file_name, 527 dexopt_flags, (char*) NULL); 528 ALOGE("execl(%s) failed: %s\n", DEX_OPT_BIN, strerror(errno)); 529 } 530 531 static int wait_dexopt(pid_t pid, const char* apk_path) 532 { 533 int status; 534 pid_t got_pid; 535 536 /* 537 * Wait for the optimization process to finish. 538 */ 539 while (1) { 540 got_pid = waitpid(pid, &status, 0); 541 if (got_pid == -1 && errno == EINTR) { 542 printf("waitpid interrupted, retrying\n"); 543 } else { 544 break; 545 } 546 } 547 if (got_pid != pid) { 548 ALOGW("waitpid failed: wanted %d, got %d: %s\n", 549 (int) pid, (int) got_pid, strerror(errno)); 550 return 1; 551 } 552 553 if (WIFEXITED(status) && WEXITSTATUS(status) == 0) { 554 ALOGV("DexInv: --- END '%s' (success) ---\n", apk_path); 555 return 0; 556 } else { 557 ALOGW("DexInv: --- END '%s' --- status=0x%04x, process failed\n", 558 apk_path, status); 559 return status; /* always nonzero */ 560 } 561 } 562 563 int dexopt(const char *apk_path, uid_t uid, int is_public) 564 { 565 struct utimbuf ut; 566 struct stat apk_stat, dex_stat; 567 char dex_path[PKG_PATH_MAX]; 568 char dexopt_flags[PROPERTY_VALUE_MAX]; 569 char *end; 570 int res, zip_fd=-1, odex_fd=-1; 571 572 /* Before anything else: is there a .odex file? If so, we have 573 * pre-optimized the apk and there is nothing to do here. 574 */ 575 if (strlen(apk_path) >= (PKG_PATH_MAX - 8)) { 576 return -1; 577 } 578 579 /* platform-specific flags affecting optimization and verification */ 580 property_get("dalvik.vm.dexopt-flags", dexopt_flags, ""); 581 582 strcpy(dex_path, apk_path); 583 end = strrchr(dex_path, '.'); 584 if (end != NULL) { 585 strcpy(end, ".odex"); 586 if (stat(dex_path, &dex_stat) == 0) { 587 return 0; 588 } 589 } 590 591 if (create_cache_path(dex_path, apk_path)) { 592 return -1; 593 } 594 595 memset(&apk_stat, 0, sizeof(apk_stat)); 596 stat(apk_path, &apk_stat); 597 598 zip_fd = open(apk_path, O_RDONLY, 0); 599 if (zip_fd < 0) { 600 ALOGE("dexopt cannot open '%s' for input\n", apk_path); 601 return -1; 602 } 603 604 unlink(dex_path); 605 odex_fd = open(dex_path, O_RDWR | O_CREAT | O_EXCL, 0644); 606 if (odex_fd < 0) { 607 ALOGE("dexopt cannot open '%s' for output\n", dex_path); 608 goto fail; 609 } 610 if (fchown(odex_fd, AID_SYSTEM, uid) < 0) { 611 ALOGE("dexopt cannot chown '%s'\n", dex_path); 612 goto fail; 613 } 614 if (fchmod(odex_fd, 615 S_IRUSR|S_IWUSR|S_IRGRP | 616 (is_public ? S_IROTH : 0)) < 0) { 617 ALOGE("dexopt cannot chmod '%s'\n", dex_path); 618 goto fail; 619 } 620 621 ALOGV("DexInv: --- BEGIN '%s' ---\n", apk_path); 622 623 pid_t pid; 624 pid = fork(); 625 if (pid == 0) { 626 /* child -- drop privileges before continuing */ 627 if (setgid(uid) != 0) { 628 ALOGE("setgid(%d) failed during dexopt\n", uid); 629 exit(64); 630 } 631 if (setuid(uid) != 0) { 632 ALOGE("setuid(%d) during dexopt\n", uid); 633 exit(65); 634 } 635 if (flock(odex_fd, LOCK_EX | LOCK_NB) != 0) { 636 ALOGE("flock(%s) failed: %s\n", dex_path, strerror(errno)); 637 exit(66); 638 } 639 640 run_dexopt(zip_fd, odex_fd, apk_path, dexopt_flags); 641 exit(67); /* only get here on exec failure */ 642 } else { 643 res = wait_dexopt(pid, apk_path); 644 if (res != 0) { 645 ALOGE("dexopt failed on '%s' res = %d\n", dex_path, res); 646 goto fail; 647 } 648 } 649 650 ut.actime = apk_stat.st_atime; 651 ut.modtime = apk_stat.st_mtime; 652 utime(dex_path, &ut); 653 654 close(odex_fd); 655 close(zip_fd); 656 return 0; 657 658 fail: 659 if (odex_fd >= 0) { 660 close(odex_fd); 661 unlink(dex_path); 662 } 663 if (zip_fd >= 0) { 664 close(zip_fd); 665 } 666 return -1; 667 } 668 669 void mkinnerdirs(char* path, int basepos, mode_t mode, int uid, int gid, 670 struct stat* statbuf) 671 { 672 while (path[basepos] != 0) { 673 if (path[basepos] == '/') { 674 path[basepos] = 0; 675 if (lstat(path, statbuf) < 0) { 676 ALOGV("Making directory: %s\n", path); 677 if (mkdir(path, mode) == 0) { 678 chown(path, uid, gid); 679 } else { 680 ALOGW("Unable to make directory %s: %s\n", path, strerror(errno)); 681 } 682 } 683 path[basepos] = '/'; 684 basepos++; 685 } 686 basepos++; 687 } 688 } 689 690 int movefileordir(char* srcpath, char* dstpath, int dstbasepos, 691 int dstuid, int dstgid, struct stat* statbuf) 692 { 693 DIR *d; 694 struct dirent *de; 695 int res; 696 697 int srcend = strlen(srcpath); 698 int dstend = strlen(dstpath); 699 700 if (lstat(srcpath, statbuf) < 0) { 701 ALOGW("Unable to stat %s: %s\n", srcpath, strerror(errno)); 702 return 1; 703 } 704 705 if ((statbuf->st_mode&S_IFDIR) == 0) { 706 mkinnerdirs(dstpath, dstbasepos, S_IRWXU|S_IRWXG|S_IXOTH, 707 dstuid, dstgid, statbuf); 708 ALOGV("Renaming %s to %s (uid %d)\n", srcpath, dstpath, dstuid); 709 if (rename(srcpath, dstpath) >= 0) { 710 if (chown(dstpath, dstuid, dstgid) < 0) { 711 ALOGE("cannot chown %s: %s\n", dstpath, strerror(errno)); 712 unlink(dstpath); 713 return 1; 714 } 715 } else { 716 ALOGW("Unable to rename %s to %s: %s\n", 717 srcpath, dstpath, strerror(errno)); 718 return 1; 719 } 720 return 0; 721 } 722 723 d = opendir(srcpath); 724 if (d == NULL) { 725 ALOGW("Unable to opendir %s: %s\n", srcpath, strerror(errno)); 726 return 1; 727 } 728 729 res = 0; 730 731 while ((de = readdir(d))) { 732 const char *name = de->d_name; 733 /* always skip "." and ".." */ 734 if (name[0] == '.') { 735 if (name[1] == 0) continue; 736 if ((name[1] == '.') && (name[2] == 0)) continue; 737 } 738 739 if ((srcend+strlen(name)) >= (PKG_PATH_MAX-2)) { 740 ALOGW("Source path too long; skipping: %s/%s\n", srcpath, name); 741 continue; 742 } 743 744 if ((dstend+strlen(name)) >= (PKG_PATH_MAX-2)) { 745 ALOGW("Destination path too long; skipping: %s/%s\n", dstpath, name); 746 continue; 747 } 748 749 srcpath[srcend] = dstpath[dstend] = '/'; 750 strcpy(srcpath+srcend+1, name); 751 strcpy(dstpath+dstend+1, name); 752 753 if (movefileordir(srcpath, dstpath, dstbasepos, dstuid, dstgid, statbuf) != 0) { 754 res = 1; 755 } 756 757 // Note: we will be leaving empty directories behind in srcpath, 758 // but that is okay, the package manager will be erasing all of the 759 // data associated with .apks that disappear. 760 761 srcpath[srcend] = dstpath[dstend] = 0; 762 } 763 764 closedir(d); 765 return res; 766 } 767 768 int movefiles() 769 { 770 DIR *d; 771 int dfd, subfd; 772 struct dirent *de; 773 struct stat s; 774 char buf[PKG_PATH_MAX+1]; 775 int bufp, bufe, bufi, readlen; 776 777 char srcpkg[PKG_NAME_MAX]; 778 char dstpkg[PKG_NAME_MAX]; 779 char srcpath[PKG_PATH_MAX]; 780 char dstpath[PKG_PATH_MAX]; 781 int dstuid=-1, dstgid=-1; 782 int hasspace; 783 784 d = opendir(UPDATE_COMMANDS_DIR_PREFIX); 785 if (d == NULL) { 786 goto done; 787 } 788 dfd = dirfd(d); 789 790 /* Iterate through all files in the directory, executing the 791 * file movements requested there-in. 792 */ 793 while ((de = readdir(d))) { 794 const char *name = de->d_name; 795 796 if (de->d_type == DT_DIR) { 797 continue; 798 } else { 799 subfd = openat(dfd, name, O_RDONLY); 800 if (subfd < 0) { 801 ALOGW("Unable to open update commands at %s%s\n", 802 UPDATE_COMMANDS_DIR_PREFIX, name); 803 continue; 804 } 805 806 bufp = 0; 807 bufe = 0; 808 buf[PKG_PATH_MAX] = 0; 809 srcpkg[0] = dstpkg[0] = 0; 810 while (1) { 811 bufi = bufp; 812 while (bufi < bufe && buf[bufi] != '\n') { 813 bufi++; 814 } 815 if (bufi < bufe) { 816 buf[bufi] = 0; 817 ALOGV("Processing line: %s\n", buf+bufp); 818 hasspace = 0; 819 while (bufp < bufi && isspace(buf[bufp])) { 820 hasspace = 1; 821 bufp++; 822 } 823 if (buf[bufp] == '#' || bufp == bufi) { 824 // skip comments and empty lines. 825 } else if (hasspace) { 826 if (dstpkg[0] == 0) { 827 ALOGW("Path before package line in %s%s: %s\n", 828 UPDATE_COMMANDS_DIR_PREFIX, name, buf+bufp); 829 } else if (srcpkg[0] == 0) { 830 // Skip -- source package no longer exists. 831 } else { 832 ALOGV("Move file: %s (from %s to %s)\n", buf+bufp, srcpkg, dstpkg); 833 if (!create_move_path(srcpath, srcpkg, buf+bufp, 0) && 834 !create_move_path(dstpath, dstpkg, buf+bufp, 0)) { 835 movefileordir(srcpath, dstpath, 836 strlen(dstpath)-strlen(buf+bufp), 837 dstuid, dstgid, &s); 838 } 839 } 840 } else { 841 char* div = strchr(buf+bufp, ':'); 842 if (div == NULL) { 843 ALOGW("Bad package spec in %s%s; no ':' sep: %s\n", 844 UPDATE_COMMANDS_DIR_PREFIX, name, buf+bufp); 845 } else { 846 *div = 0; 847 div++; 848 if (strlen(buf+bufp) < PKG_NAME_MAX) { 849 strcpy(dstpkg, buf+bufp); 850 } else { 851 srcpkg[0] = dstpkg[0] = 0; 852 ALOGW("Package name too long in %s%s: %s\n", 853 UPDATE_COMMANDS_DIR_PREFIX, name, buf+bufp); 854 } 855 if (strlen(div) < PKG_NAME_MAX) { 856 strcpy(srcpkg, div); 857 } else { 858 srcpkg[0] = dstpkg[0] = 0; 859 ALOGW("Package name too long in %s%s: %s\n", 860 UPDATE_COMMANDS_DIR_PREFIX, name, div); 861 } 862 if (srcpkg[0] != 0) { 863 if (!create_pkg_path(srcpath, srcpkg, PKG_DIR_POSTFIX, 0)) { 864 if (lstat(srcpath, &s) < 0) { 865 // Package no longer exists -- skip. 866 srcpkg[0] = 0; 867 } 868 } else { 869 srcpkg[0] = 0; 870 ALOGW("Can't create path %s in %s%s\n", 871 div, UPDATE_COMMANDS_DIR_PREFIX, name); 872 } 873 if (srcpkg[0] != 0) { 874 if (!create_pkg_path(dstpath, dstpkg, PKG_DIR_POSTFIX, 0)) { 875 if (lstat(dstpath, &s) == 0) { 876 dstuid = s.st_uid; 877 dstgid = s.st_gid; 878 } else { 879 // Destination package doesn't 880 // exist... due to original-package, 881 // this is normal, so don't be 882 // noisy about it. 883 srcpkg[0] = 0; 884 } 885 } else { 886 srcpkg[0] = 0; 887 ALOGW("Can't create path %s in %s%s\n", 888 div, UPDATE_COMMANDS_DIR_PREFIX, name); 889 } 890 } 891 ALOGV("Transfering from %s to %s: uid=%d\n", 892 srcpkg, dstpkg, dstuid); 893 } 894 } 895 } 896 bufp = bufi+1; 897 } else { 898 if (bufp == 0) { 899 if (bufp < bufe) { 900 ALOGW("Line too long in %s%s, skipping: %s\n", 901 UPDATE_COMMANDS_DIR_PREFIX, name, buf); 902 } 903 } else if (bufp < bufe) { 904 memcpy(buf, buf+bufp, bufe-bufp); 905 bufe -= bufp; 906 bufp = 0; 907 } 908 readlen = read(subfd, buf+bufe, PKG_PATH_MAX-bufe); 909 if (readlen < 0) { 910 ALOGW("Failure reading update commands in %s%s: %s\n", 911 UPDATE_COMMANDS_DIR_PREFIX, name, strerror(errno)); 912 break; 913 } else if (readlen == 0) { 914 break; 915 } 916 bufe += readlen; 917 buf[bufe] = 0; 918 ALOGV("Read buf: %s\n", buf); 919 } 920 } 921 close(subfd); 922 } 923 } 924 closedir(d); 925 done: 926 return 0; 927 } 928 929 int linklib(const char* dataDir, const char* asecLibDir) 930 { 931 char libdir[PKG_PATH_MAX]; 932 struct stat s, libStat; 933 int rc = 0; 934 935 const size_t libdirLen = strlen(dataDir) + strlen(PKG_LIB_POSTFIX); 936 if (libdirLen >= PKG_PATH_MAX) { 937 ALOGE("library dir len too large"); 938 return -1; 939 } 940 941 if (snprintf(libdir, sizeof(libdir), "%s%s", dataDir, PKG_LIB_POSTFIX) != (ssize_t)libdirLen) { 942 ALOGE("library dir not written successfully: %s\n", strerror(errno)); 943 return -1; 944 } 945 946 if (stat(dataDir, &s) < 0) return -1; 947 948 if (chown(dataDir, 0, 0) < 0) { 949 ALOGE("failed to chown '%s': %s\n", dataDir, strerror(errno)); 950 return -1; 951 } 952 953 if (chmod(dataDir, 0700) < 0) { 954 ALOGE("failed to chmod '%s': %s\n", dataDir, strerror(errno)); 955 rc = -1; 956 goto out; 957 } 958 959 if (lstat(libdir, &libStat) < 0) { 960 ALOGE("couldn't stat lib dir: %s\n", strerror(errno)); 961 rc = -1; 962 goto out; 963 } 964 965 if (S_ISDIR(libStat.st_mode)) { 966 if (delete_dir_contents(libdir, 1, 0) < 0) { 967 rc = -1; 968 goto out; 969 } 970 } else if (S_ISLNK(libStat.st_mode)) { 971 if (unlink(libdir) < 0) { 972 rc = -1; 973 goto out; 974 } 975 } 976 977 if (symlink(asecLibDir, libdir) < 0) { 978 ALOGE("couldn't symlink directory '%s' -> '%s': %s\n", libdir, asecLibDir, strerror(errno)); 979 rc = -errno; 980 goto out; 981 } 982 983 if (lchown(libdir, AID_SYSTEM, AID_SYSTEM) < 0) { 984 ALOGE("cannot chown dir '%s': %s\n", libdir, strerror(errno)); 985 unlink(libdir); 986 rc = -errno; 987 goto out; 988 } 989 990 out: 991 if (chmod(dataDir, s.st_mode) < 0) { 992 ALOGE("failed to chmod '%s': %s\n", dataDir, strerror(errno)); 993 rc = -errno; 994 } 995 996 if (chown(dataDir, s.st_uid, s.st_gid) < 0) { 997 ALOGE("failed to chown '%s' : %s\n", dataDir, strerror(errno)); 998 return -errno; 999 } 1000 1001 return rc; 1002 } 1003 1004 int unlinklib(const char* dataDir) 1005 { 1006 char libdir[PKG_PATH_MAX]; 1007 struct stat s, libStat; 1008 int rc = 0; 1009 1010 const size_t libdirLen = strlen(dataDir) + strlen(PKG_LIB_POSTFIX); 1011 if (libdirLen >= PKG_PATH_MAX) { 1012 return -1; 1013 } 1014 1015 if (snprintf(libdir, sizeof(libdir), "%s%s", dataDir, PKG_LIB_POSTFIX) != (ssize_t)libdirLen) { 1016 ALOGE("library dir not written successfully: %s\n", strerror(errno)); 1017 return -1; 1018 } 1019 1020 if (stat(dataDir, &s) < 0) { 1021 ALOGE("couldn't state data dir"); 1022 return -1; 1023 } 1024 1025 if (chown(dataDir, 0, 0) < 0) { 1026 ALOGE("failed to chown '%s': %s\n", dataDir, strerror(errno)); 1027 return -1; 1028 } 1029 1030 if (chmod(dataDir, 0700) < 0) { 1031 ALOGE("failed to chmod '%s': %s\n", dataDir, strerror(errno)); 1032 rc = -1; 1033 goto out; 1034 } 1035 1036 if (lstat(libdir, &libStat) < 0) { 1037 ALOGE("couldn't stat lib dir: %s\n", strerror(errno)); 1038 rc = -1; 1039 goto out; 1040 } 1041 1042 if (S_ISDIR(libStat.st_mode)) { 1043 if (delete_dir_contents(libdir, 1, 0) < 0) { 1044 rc = -1; 1045 goto out; 1046 } 1047 } else if (S_ISLNK(libStat.st_mode)) { 1048 if (unlink(libdir) < 0) { 1049 rc = -1; 1050 goto out; 1051 } 1052 } 1053 1054 if (mkdir(libdir, 0755) < 0) { 1055 ALOGE("cannot create dir '%s': %s\n", libdir, strerror(errno)); 1056 rc = -errno; 1057 goto out; 1058 } 1059 1060 if (chown(libdir, AID_SYSTEM, AID_SYSTEM) < 0) { 1061 ALOGE("cannot chown dir '%s': %s\n", libdir, strerror(errno)); 1062 unlink(libdir); 1063 rc = -errno; 1064 goto out; 1065 } 1066 1067 out: 1068 if (chmod(dataDir, s.st_mode) < 0) { 1069 ALOGE("failed to chmod '%s': %s\n", dataDir, strerror(errno)); 1070 rc = -1; 1071 } 1072 1073 if (chown(dataDir, s.st_uid, s.st_gid) < 0) { 1074 ALOGE("failed to chown '%s' : %s\n", dataDir, strerror(errno)); 1075 return -1; 1076 } 1077 1078 return rc; 1079 } 1080
