1 /* 2 * Copyright (C) 2014 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 // This program takes a file on an ext4 filesystem and produces a list 18 // of the blocks that file occupies, which enables the file contents 19 // to be read directly from the block device without mounting the 20 // filesystem. 21 // 22 // If the filesystem is using an encrypted block device, it will also 23 // read the file and rewrite it to the same blocks of the underlying 24 // (unencrypted) block device, so the file contents can be read 25 // without the need for the decryption key. 26 // 27 // The output of this program is a "block map" which looks like this: 28 // 29 // /dev/block/platform/msm_sdcc.1/by-name/userdata # block device 30 // 49652 4096 # file size in bytes, block size 31 // 3 # count of block ranges 32 // 1000 1008 # block range 0 33 // 2100 2102 # ... block range 1 34 // 30 33 # ... block range 2 35 // 36 // Each block range represents a half-open interval; the line "30 33" 37 // reprents the blocks [30, 31, 32]. 38 // 39 // Recovery can take this block map file and retrieve the underlying 40 // file data to use as an update package. 41 42 /** 43 * In addition to the uncrypt work, uncrypt also takes care of setting and 44 * clearing the bootloader control block (BCB) at /misc partition. 45 * 46 * uncrypt is triggered as init services on demand. It uses socket to 47 * communicate with its caller (i.e. system_server). The socket is managed by 48 * init (i.e. created prior to the service starts, and destroyed when uncrypt 49 * exits). 50 * 51 * Below is the uncrypt protocol. 52 * 53 * a. caller b. init c. uncrypt 54 * --------------- ------------ -------------- 55 * a1. ctl.start: 56 * setup-bcb / 57 * clear-bcb / 58 * uncrypt 59 * 60 * b2. create socket at 61 * /dev/socket/uncrypt 62 * 63 * c3. listen and accept 64 * 65 * a4. send a 4-byte int 66 * (message length) 67 * c5. receive message length 68 * a6. send message 69 * c7. receive message 70 * c8. <do the work; may send 71 * the progress> 72 * a9. <may handle progress> 73 * c10. <upon finishing> 74 * send "100" or "-1" 75 * 76 * a11. receive status code 77 * a12. send a 4-byte int to 78 * ack the receive of the 79 * final status code 80 * c13. receive and exit 81 * 82 * b14. destroy the socket 83 * 84 * Note that a12 and c13 are necessary to ensure a11 happens before the socket 85 * gets destroyed in b14. 86 */ 87 88 #include <arpa/inet.h> 89 #include <errno.h> 90 #include <fcntl.h> 91 #include <inttypes.h> 92 #include <libgen.h> 93 #include <linux/fs.h> 94 #include <stdarg.h> 95 #include <stdio.h> 96 #include <stdlib.h> 97 #include <string.h> 98 #include <sys/mman.h> 99 #include <sys/socket.h> 100 #include <sys/stat.h> 101 #include <sys/types.h> 102 #include <unistd.h> 103 104 #include <algorithm> 105 #include <memory> 106 #include <vector> 107 108 #include <android-base/file.h> 109 #include <android-base/logging.h> 110 #include <android-base/stringprintf.h> 111 #include <android-base/strings.h> 112 #include <bootloader_message/bootloader_message.h> 113 #include <cutils/android_reboot.h> 114 #include <cutils/properties.h> 115 #include <cutils/sockets.h> 116 #include <fs_mgr.h> 117 118 #define LOG_TAG "uncrypt" 119 #include <log/log.h> 120 121 #include "error_code.h" 122 #include "unique_fd.h" 123 124 #define WINDOW_SIZE 5 125 126 // uncrypt provides three services: SETUP_BCB, CLEAR_BCB and UNCRYPT. 127 // 128 // SETUP_BCB and CLEAR_BCB services use socket communication and do not rely 129 // on /cache partitions. They will handle requests to reboot into recovery 130 // (for applying updates for non-A/B devices, or factory resets for all 131 // devices). 132 // 133 // UNCRYPT service still needs files on /cache partition (UNCRYPT_PATH_FILE 134 // and CACHE_BLOCK_MAP). It will be working (and needed) only for non-A/B 135 // devices, on which /cache partitions always exist. 136 static const std::string CACHE_BLOCK_MAP = "/cache/recovery/block.map"; 137 static const std::string UNCRYPT_PATH_FILE = "/cache/recovery/uncrypt_file"; 138 static const std::string UNCRYPT_STATUS = "/cache/recovery/uncrypt_status"; 139 static const std::string UNCRYPT_SOCKET = "uncrypt"; 140 141 static struct fstab* fstab = nullptr; 142 143 static int write_at_offset(unsigned char* buffer, size_t size, int wfd, off64_t offset) { 144 if (TEMP_FAILURE_RETRY(lseek64(wfd, offset, SEEK_SET)) == -1) { 145 ALOGE("error seeking to offset %" PRId64 ": %s", offset, strerror(errno)); 146 return -1; 147 } 148 if (!android::base::WriteFully(wfd, buffer, size)) { 149 ALOGE("error writing offset %" PRId64 ": %s", offset, strerror(errno)); 150 return -1; 151 } 152 return 0; 153 } 154 155 static void add_block_to_ranges(std::vector<int>& ranges, int new_block) { 156 if (!ranges.empty() && new_block == ranges.back()) { 157 // If the new block comes immediately after the current range, 158 // all we have to do is extend the current range. 159 ++ranges.back(); 160 } else { 161 // We need to start a new range. 162 ranges.push_back(new_block); 163 ranges.push_back(new_block + 1); 164 } 165 } 166 167 static struct fstab* read_fstab() { 168 fstab = NULL; 169 170 // The fstab path is always "/fstab.${ro.hardware}". 171 char fstab_path[PATH_MAX+1] = "/fstab."; 172 if (!property_get("ro.hardware", fstab_path+strlen(fstab_path), "")) { 173 ALOGE("failed to get ro.hardware"); 174 return NULL; 175 } 176 177 fstab = fs_mgr_read_fstab(fstab_path); 178 if (!fstab) { 179 ALOGE("failed to read %s", fstab_path); 180 return NULL; 181 } 182 183 return fstab; 184 } 185 186 static const char* find_block_device(const char* path, bool* encryptable, bool* encrypted) { 187 // Look for a volume whose mount point is the prefix of path and 188 // return its block device. Set encrypted if it's currently 189 // encrypted. 190 for (int i = 0; i < fstab->num_entries; ++i) { 191 struct fstab_rec* v = &fstab->recs[i]; 192 if (!v->mount_point) { 193 continue; 194 } 195 int len = strlen(v->mount_point); 196 if (strncmp(path, v->mount_point, len) == 0 && 197 (path[len] == '/' || path[len] == 0)) { 198 *encrypted = false; 199 *encryptable = false; 200 if (fs_mgr_is_encryptable(v) || fs_mgr_is_file_encrypted(v)) { 201 *encryptable = true; 202 char buffer[PROPERTY_VALUE_MAX+1]; 203 if (property_get("ro.crypto.state", buffer, "") && 204 strcmp(buffer, "encrypted") == 0) { 205 *encrypted = true; 206 } 207 } 208 return v->blk_device; 209 } 210 } 211 212 return NULL; 213 } 214 215 static bool write_status_to_socket(int status, int socket) { 216 int status_out = htonl(status); 217 return android::base::WriteFully(socket, &status_out, sizeof(int)); 218 } 219 220 // Parse uncrypt_file to find the update package name. 221 static bool find_uncrypt_package(const std::string& uncrypt_path_file, std::string* package_name) { 222 CHECK(package_name != nullptr); 223 std::string uncrypt_path; 224 if (!android::base::ReadFileToString(uncrypt_path_file, &uncrypt_path)) { 225 ALOGE("failed to open \"%s\": %s", uncrypt_path_file.c_str(), strerror(errno)); 226 return false; 227 } 228 229 // Remove the trailing '\n' if present. 230 *package_name = android::base::Trim(uncrypt_path); 231 return true; 232 } 233 234 static int produce_block_map(const char* path, const char* map_file, const char* blk_dev, 235 bool encrypted, int socket) { 236 std::string err; 237 if (!android::base::RemoveFileIfExists(map_file, &err)) { 238 ALOGE("failed to remove the existing map file %s: %s", map_file, err.c_str()); 239 return kUncryptFileRemoveError; 240 } 241 std::string tmp_map_file = std::string(map_file) + ".tmp"; 242 unique_fd mapfd(open(tmp_map_file.c_str(), O_WRONLY | O_CREAT, S_IRUSR | S_IWUSR)); 243 if (!mapfd) { 244 ALOGE("failed to open %s: %s\n", tmp_map_file.c_str(), strerror(errno)); 245 return kUncryptFileOpenError; 246 } 247 248 // Make sure we can write to the socket. 249 if (!write_status_to_socket(0, socket)) { 250 ALOGE("failed to write to socket %d\n", socket); 251 return kUncryptSocketWriteError; 252 } 253 254 struct stat sb; 255 if (stat(path, &sb) != 0) { 256 ALOGE("failed to stat %s", path); 257 return kUncryptFileStatError; 258 } 259 260 ALOGI(" block size: %ld bytes", static_cast<long>(sb.st_blksize)); 261 262 int blocks = ((sb.st_size-1) / sb.st_blksize) + 1; 263 ALOGI(" file size: %" PRId64 " bytes, %d blocks", sb.st_size, blocks); 264 265 std::vector<int> ranges; 266 267 std::string s = android::base::StringPrintf("%s\n%" PRId64 " %ld\n", 268 blk_dev, sb.st_size, static_cast<long>(sb.st_blksize)); 269 if (!android::base::WriteStringToFd(s, mapfd.get())) { 270 ALOGE("failed to write %s: %s", tmp_map_file.c_str(), strerror(errno)); 271 return kUncryptWriteError; 272 } 273 274 std::vector<std::vector<unsigned char>> buffers; 275 if (encrypted) { 276 buffers.resize(WINDOW_SIZE, std::vector<unsigned char>(sb.st_blksize)); 277 } 278 int head_block = 0; 279 int head = 0, tail = 0; 280 281 unique_fd fd(open(path, O_RDONLY)); 282 if (!fd) { 283 ALOGE("failed to open %s for reading: %s", path, strerror(errno)); 284 return kUncryptFileOpenError; 285 } 286 287 unique_fd wfd(-1); 288 if (encrypted) { 289 wfd = open(blk_dev, O_WRONLY); 290 if (!wfd) { 291 ALOGE("failed to open fd for writing: %s", strerror(errno)); 292 return kUncryptBlockOpenError; 293 } 294 } 295 296 off64_t pos = 0; 297 int last_progress = 0; 298 while (pos < sb.st_size) { 299 // Update the status file, progress must be between [0, 99]. 300 int progress = static_cast<int>(100 * (double(pos) / double(sb.st_size))); 301 if (progress > last_progress) { 302 last_progress = progress; 303 write_status_to_socket(progress, socket); 304 } 305 306 if ((tail+1) % WINDOW_SIZE == head) { 307 // write out head buffer 308 int block = head_block; 309 if (ioctl(fd.get(), FIBMAP, &block) != 0) { 310 ALOGE("failed to find block %d", head_block); 311 return kUncryptIoctlError; 312 } 313 add_block_to_ranges(ranges, block); 314 if (encrypted) { 315 if (write_at_offset(buffers[head].data(), sb.st_blksize, wfd.get(), 316 static_cast<off64_t>(sb.st_blksize) * block) != 0) { 317 return kUncryptWriteError; 318 } 319 } 320 head = (head + 1) % WINDOW_SIZE; 321 ++head_block; 322 } 323 324 // read next block to tail 325 if (encrypted) { 326 size_t to_read = static_cast<size_t>( 327 std::min(static_cast<off64_t>(sb.st_blksize), sb.st_size - pos)); 328 if (!android::base::ReadFully(fd.get(), buffers[tail].data(), to_read)) { 329 ALOGE("failed to read: %s", strerror(errno)); 330 return kUncryptReadError; 331 } 332 pos += to_read; 333 } else { 334 // If we're not encrypting; we don't need to actually read 335 // anything, just skip pos forward as if we'd read a 336 // block. 337 pos += sb.st_blksize; 338 } 339 tail = (tail+1) % WINDOW_SIZE; 340 } 341 342 while (head != tail) { 343 // write out head buffer 344 int block = head_block; 345 if (ioctl(fd.get(), FIBMAP, &block) != 0) { 346 ALOGE("failed to find block %d", head_block); 347 return kUncryptIoctlError; 348 } 349 add_block_to_ranges(ranges, block); 350 if (encrypted) { 351 if (write_at_offset(buffers[head].data(), sb.st_blksize, wfd.get(), 352 static_cast<off64_t>(sb.st_blksize) * block) != 0) { 353 return kUncryptWriteError; 354 } 355 } 356 head = (head + 1) % WINDOW_SIZE; 357 ++head_block; 358 } 359 360 if (!android::base::WriteStringToFd( 361 android::base::StringPrintf("%zu\n", ranges.size() / 2), mapfd.get())) { 362 ALOGE("failed to write %s: %s", tmp_map_file.c_str(), strerror(errno)); 363 return kUncryptWriteError; 364 } 365 for (size_t i = 0; i < ranges.size(); i += 2) { 366 if (!android::base::WriteStringToFd( 367 android::base::StringPrintf("%d %d\n", ranges[i], ranges[i+1]), mapfd.get())) { 368 ALOGE("failed to write %s: %s", tmp_map_file.c_str(), strerror(errno)); 369 return kUncryptWriteError; 370 } 371 } 372 373 if (fsync(mapfd.get()) == -1) { 374 ALOGE("failed to fsync \"%s\": %s", tmp_map_file.c_str(), strerror(errno)); 375 return kUncryptFileSyncError; 376 } 377 if (close(mapfd.get()) == -1) { 378 ALOGE("failed to close %s: %s", tmp_map_file.c_str(), strerror(errno)); 379 return kUncryptFileCloseError; 380 } 381 mapfd = -1; 382 383 if (encrypted) { 384 if (fsync(wfd.get()) == -1) { 385 ALOGE("failed to fsync \"%s\": %s", blk_dev, strerror(errno)); 386 return kUncryptFileSyncError; 387 } 388 if (close(wfd.get()) == -1) { 389 ALOGE("failed to close %s: %s", blk_dev, strerror(errno)); 390 return kUncryptFileCloseError; 391 } 392 wfd = -1; 393 } 394 395 if (rename(tmp_map_file.c_str(), map_file) == -1) { 396 ALOGE("failed to rename %s to %s: %s", tmp_map_file.c_str(), map_file, strerror(errno)); 397 return kUncryptFileRenameError; 398 } 399 // Sync dir to make rename() result written to disk. 400 std::string file_name = map_file; 401 std::string dir_name = dirname(&file_name[0]); 402 unique_fd dfd(open(dir_name.c_str(), O_RDONLY | O_DIRECTORY)); 403 if (!dfd) { 404 ALOGE("failed to open dir %s: %s", dir_name.c_str(), strerror(errno)); 405 return kUncryptFileOpenError; 406 } 407 if (fsync(dfd.get()) == -1) { 408 ALOGE("failed to fsync %s: %s", dir_name.c_str(), strerror(errno)); 409 return kUncryptFileSyncError; 410 } 411 if (close(dfd.get()) == -1) { 412 ALOGE("failed to close %s: %s", dir_name.c_str(), strerror(errno)); 413 return kUncryptFileCloseError; 414 } 415 dfd = -1; 416 return 0; 417 } 418 419 static int uncrypt(const char* input_path, const char* map_file, const int socket) { 420 ALOGI("update package is \"%s\"", input_path); 421 422 // Turn the name of the file we're supposed to convert into an 423 // absolute path, so we can find what filesystem it's on. 424 char path[PATH_MAX+1]; 425 if (realpath(input_path, path) == NULL) { 426 ALOGE("failed to convert \"%s\" to absolute path: %s", input_path, strerror(errno)); 427 return 1; 428 } 429 430 bool encryptable; 431 bool encrypted; 432 const char* blk_dev = find_block_device(path, &encryptable, &encrypted); 433 if (blk_dev == NULL) { 434 ALOGE("failed to find block device for %s", path); 435 return 1; 436 } 437 438 // If the filesystem it's on isn't encrypted, we only produce the 439 // block map, we don't rewrite the file contents (it would be 440 // pointless to do so). 441 ALOGI("encryptable: %s", encryptable ? "yes" : "no"); 442 ALOGI(" encrypted: %s", encrypted ? "yes" : "no"); 443 444 // Recovery supports installing packages from 3 paths: /cache, 445 // /data, and /sdcard. (On a particular device, other locations 446 // may work, but those are three we actually expect.) 447 // 448 // On /data we want to convert the file to a block map so that we 449 // can read the package without mounting the partition. On /cache 450 // and /sdcard we leave the file alone. 451 if (strncmp(path, "/data/", 6) == 0) { 452 ALOGI("writing block map %s", map_file); 453 return produce_block_map(path, map_file, blk_dev, encrypted, socket); 454 } 455 456 return 0; 457 } 458 459 static void log_uncrypt_error_code(UncryptErrorCode error_code) { 460 if (!android::base::WriteStringToFile(android::base::StringPrintf( 461 "uncrypt_error: %d\n", error_code), UNCRYPT_STATUS)) { 462 ALOGW("failed to write to %s: %s", UNCRYPT_STATUS.c_str(), strerror(errno)); 463 } 464 } 465 466 static bool uncrypt_wrapper(const char* input_path, const char* map_file, const int socket) { 467 // Initialize the uncrypt error to kUncryptErrorPlaceholder. 468 log_uncrypt_error_code(kUncryptErrorPlaceholder); 469 470 std::string package; 471 if (input_path == nullptr) { 472 if (!find_uncrypt_package(UNCRYPT_PATH_FILE, &package)) { 473 write_status_to_socket(-1, socket); 474 // Overwrite the error message. 475 log_uncrypt_error_code(kUncryptPackageMissingError); 476 return false; 477 } 478 input_path = package.c_str(); 479 } 480 CHECK(map_file != nullptr); 481 482 auto start = std::chrono::system_clock::now(); 483 int status = uncrypt(input_path, map_file, socket); 484 std::chrono::duration<double> duration = std::chrono::system_clock::now() - start; 485 int count = static_cast<int>(duration.count()); 486 487 std::string uncrypt_message = android::base::StringPrintf("uncrypt_time: %d\n", count); 488 if (status != 0) { 489 // Log the time cost and error code if uncrypt fails. 490 uncrypt_message += android::base::StringPrintf("uncrypt_error: %d\n", status); 491 if (!android::base::WriteStringToFile(uncrypt_message, UNCRYPT_STATUS)) { 492 ALOGW("failed to write to %s: %s", UNCRYPT_STATUS.c_str(), strerror(errno)); 493 } 494 495 write_status_to_socket(-1, socket); 496 return false; 497 } 498 499 if (!android::base::WriteStringToFile(uncrypt_message, UNCRYPT_STATUS)) { 500 ALOGW("failed to write to %s: %s", UNCRYPT_STATUS.c_str(), strerror(errno)); 501 } 502 503 write_status_to_socket(100, socket); 504 505 return true; 506 } 507 508 static bool clear_bcb(const int socket) { 509 std::string err; 510 if (!clear_bootloader_message(&err)) { 511 ALOGE("failed to clear bootloader message: %s", err.c_str()); 512 write_status_to_socket(-1, socket); 513 return false; 514 } 515 write_status_to_socket(100, socket); 516 return true; 517 } 518 519 static bool setup_bcb(const int socket) { 520 // c5. receive message length 521 int length; 522 if (!android::base::ReadFully(socket, &length, 4)) { 523 ALOGE("failed to read the length: %s", strerror(errno)); 524 return false; 525 } 526 length = ntohl(length); 527 528 // c7. receive message 529 std::string content; 530 content.resize(length); 531 if (!android::base::ReadFully(socket, &content[0], length)) { 532 ALOGE("failed to read the length: %s", strerror(errno)); 533 return false; 534 } 535 ALOGI(" received command: [%s] (%zu)", content.c_str(), content.size()); 536 std::vector<std::string> options = android::base::Split(content, "\n"); 537 std::string wipe_package; 538 for (auto& option : options) { 539 if (android::base::StartsWith(option, "--wipe_package=")) { 540 std::string path = option.substr(strlen("--wipe_package=")); 541 if (!android::base::ReadFileToString(path, &wipe_package)) { 542 ALOGE("failed to read %s: %s", path.c_str(), strerror(errno)); 543 return false; 544 } 545 option = android::base::StringPrintf("--wipe_package_size=%zu", wipe_package.size()); 546 } 547 } 548 549 // c8. setup the bcb command 550 std::string err; 551 if (!write_bootloader_message(options, &err)) { 552 ALOGE("failed to set bootloader message: %s", err.c_str()); 553 write_status_to_socket(-1, socket); 554 return false; 555 } 556 if (!wipe_package.empty() && !write_wipe_package(wipe_package, &err)) { 557 ALOGE("failed to set wipe package: %s", err.c_str()); 558 write_status_to_socket(-1, socket); 559 return false; 560 } 561 // c10. send "100" status 562 write_status_to_socket(100, socket); 563 return true; 564 } 565 566 static void usage(const char* exename) { 567 fprintf(stderr, "Usage of %s:\n", exename); 568 fprintf(stderr, "%s [<package_path> <map_file>] Uncrypt ota package.\n", exename); 569 fprintf(stderr, "%s --clear-bcb Clear BCB data in misc partition.\n", exename); 570 fprintf(stderr, "%s --setup-bcb Setup BCB data by command file.\n", exename); 571 } 572 573 int main(int argc, char** argv) { 574 enum { UNCRYPT, SETUP_BCB, CLEAR_BCB } action; 575 const char* input_path = nullptr; 576 const char* map_file = CACHE_BLOCK_MAP.c_str(); 577 578 if (argc == 2 && strcmp(argv[1], "--clear-bcb") == 0) { 579 action = CLEAR_BCB; 580 } else if (argc == 2 && strcmp(argv[1], "--setup-bcb") == 0) { 581 action = SETUP_BCB; 582 } else if (argc == 1) { 583 action = UNCRYPT; 584 } else if (argc == 3) { 585 input_path = argv[1]; 586 map_file = argv[2]; 587 action = UNCRYPT; 588 } else { 589 usage(argv[0]); 590 return 2; 591 } 592 593 if ((fstab = read_fstab()) == nullptr) { 594 log_uncrypt_error_code(kUncryptFstabReadError); 595 return 1; 596 } 597 598 // c3. The socket is created by init when starting the service. uncrypt 599 // will use the socket to communicate with its caller. 600 unique_fd service_socket(android_get_control_socket(UNCRYPT_SOCKET.c_str())); 601 if (!service_socket) { 602 ALOGE("failed to open socket \"%s\": %s", UNCRYPT_SOCKET.c_str(), strerror(errno)); 603 log_uncrypt_error_code(kUncryptSocketOpenError); 604 return 1; 605 } 606 fcntl(service_socket.get(), F_SETFD, FD_CLOEXEC); 607 608 if (listen(service_socket.get(), 1) == -1) { 609 ALOGE("failed to listen on socket %d: %s", service_socket.get(), strerror(errno)); 610 log_uncrypt_error_code(kUncryptSocketListenError); 611 return 1; 612 } 613 614 unique_fd socket_fd(accept4(service_socket.get(), nullptr, nullptr, SOCK_CLOEXEC)); 615 if (!socket_fd) { 616 ALOGE("failed to accept on socket %d: %s", service_socket.get(), strerror(errno)); 617 log_uncrypt_error_code(kUncryptSocketAcceptError); 618 return 1; 619 } 620 621 bool success = false; 622 switch (action) { 623 case UNCRYPT: 624 success = uncrypt_wrapper(input_path, map_file, socket_fd.get()); 625 break; 626 case SETUP_BCB: 627 success = setup_bcb(socket_fd.get()); 628 break; 629 case CLEAR_BCB: 630 success = clear_bcb(socket_fd.get()); 631 break; 632 default: // Should never happen. 633 ALOGE("Invalid uncrypt action code: %d", action); 634 return 1; 635 } 636 637 // c13. Read a 4-byte code from the client before uncrypt exits. This is to 638 // ensure the client to receive the last status code before the socket gets 639 // destroyed. 640 int code; 641 if (android::base::ReadFully(socket_fd.get(), &code, 4)) { 642 ALOGI(" received %d, exiting now", code); 643 } else { 644 ALOGE("failed to read the code: %s", strerror(errno)); 645 } 646 return success ? 0 : 1; 647 } 648