| /* |
| * Copyright (C) 2014 The Android Open Source Project |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| // This program takes a file on an ext4 filesystem and produces a list |
| // of the blocks that file occupies, which enables the file contents |
| // to be read directly from the block device without mounting the |
| // filesystem. |
| // |
| // If the filesystem is using an encrypted block device, it will also |
| // read the file and rewrite it to the same blocks of the underlying |
| // (unencrypted) block device, so the file contents can be read |
| // without the need for the decryption key. |
| // |
| // The output of this program is a "block map" which looks like this: |
| // |
| // /dev/block/platform/msm_sdcc.1/by-name/userdata # block device |
| // 49652 4096 # file size in bytes, block size |
| // 3 # count of block ranges |
| // 1000 1008 # block range 0 |
| // 2100 2102 # ... block range 1 |
| // 30 33 # ... block range 2 |
| // |
| // Each block range represents a half-open interval; the line "30 33" |
| // reprents the blocks [30, 31, 32]. |
| // |
| // Recovery can take this block map file and retrieve the underlying |
| // file data to use as an update package. |
| |
| /** |
| * In addition to the uncrypt work, uncrypt also takes care of setting and |
| * clearing the bootloader control block (BCB) at /misc partition. |
| * |
| * uncrypt is triggered as init services on demand. It uses socket to |
| * communicate with its caller (i.e. system_server). The socket is managed by |
| * init (i.e. created prior to the service starts, and destroyed when uncrypt |
| * exits). |
| * |
| * Below is the uncrypt protocol. |
| * |
| * a. caller b. init c. uncrypt |
| * --------------- ------------ -------------- |
| * a1. ctl.start: |
| * setup-bcb / |
| * clear-bcb / |
| * uncrypt |
| * |
| * b2. create socket at |
| * /dev/socket/uncrypt |
| * |
| * c3. listen and accept |
| * |
| * a4. send a 4-byte int |
| * (message length) |
| * c5. receive message length |
| * a6. send message |
| * c7. receive message |
| * c8. <do the work; may send |
| * the progress> |
| * a9. <may handle progress> |
| * c10. <upon finishing> |
| * send "100" or "-1" |
| * |
| * a11. receive status code |
| * a12. send a 4-byte int to |
| * ack the receive of the |
| * final status code |
| * c13. receive and exit |
| * |
| * b14. destroy the socket |
| * |
| * Note that a12 and c13 are necessary to ensure a11 happens before the socket |
| * gets destroyed in b14. |
| */ |
| |
| #include <arpa/inet.h> |
| #include <errno.h> |
| #include <fcntl.h> |
| #include <inttypes.h> |
| #include <libgen.h> |
| #include <linux/fs.h> |
| #include <stdarg.h> |
| #include <stdio.h> |
| #include <stdlib.h> |
| #include <string.h> |
| #include <sys/mman.h> |
| #include <sys/socket.h> |
| #include <sys/stat.h> |
| #include <sys/types.h> |
| #include <unistd.h> |
| |
| #include <algorithm> |
| #include <memory> |
| #include <vector> |
| |
| #include <android-base/file.h> |
| #include <android-base/logging.h> |
| #include <android-base/properties.h> |
| #include <android-base/stringprintf.h> |
| #include <android-base/strings.h> |
| #include <android-base/unique_fd.h> |
| #include <bootloader_message/bootloader_message.h> |
| #include <cutils/android_reboot.h> |
| #include <cutils/sockets.h> |
| #include <fs_mgr.h> |
| |
| #include "error_code.h" |
| |
| #define WINDOW_SIZE 5 |
| |
| // uncrypt provides three services: SETUP_BCB, CLEAR_BCB and UNCRYPT. |
| // |
| // SETUP_BCB and CLEAR_BCB services use socket communication and do not rely |
| // on /cache partitions. They will handle requests to reboot into recovery |
| // (for applying updates for non-A/B devices, or factory resets for all |
| // devices). |
| // |
| // UNCRYPT service still needs files on /cache partition (UNCRYPT_PATH_FILE |
| // and CACHE_BLOCK_MAP). It will be working (and needed) only for non-A/B |
| // devices, on which /cache partitions always exist. |
| static const std::string CACHE_BLOCK_MAP = "/cache/recovery/block.map"; |
| static const std::string UNCRYPT_PATH_FILE = "/cache/recovery/uncrypt_file"; |
| static const std::string UNCRYPT_STATUS = "/cache/recovery/uncrypt_status"; |
| static const std::string UNCRYPT_SOCKET = "uncrypt"; |
| |
| static struct fstab* fstab = nullptr; |
| |
| static int write_at_offset(unsigned char* buffer, size_t size, int wfd, off64_t offset) { |
| if (TEMP_FAILURE_RETRY(lseek64(wfd, offset, SEEK_SET)) == -1) { |
| PLOG(ERROR) << "error seeking to offset " << offset; |
| return -1; |
| } |
| if (!android::base::WriteFully(wfd, buffer, size)) { |
| PLOG(ERROR) << "error writing offset " << offset; |
| return -1; |
| } |
| return 0; |
| } |
| |
| static void add_block_to_ranges(std::vector<int>& ranges, int new_block) { |
| if (!ranges.empty() && new_block == ranges.back()) { |
| // If the new block comes immediately after the current range, |
| // all we have to do is extend the current range. |
| ++ranges.back(); |
| } else { |
| // We need to start a new range. |
| ranges.push_back(new_block); |
| ranges.push_back(new_block + 1); |
| } |
| } |
| |
| static struct fstab* read_fstab() { |
| fstab = NULL; |
| |
| // The fstab path is always "/fstab.${ro.hardware}". |
| std::string ro_hardware = android::base::GetProperty("ro.hardware", ""); |
| if (ro_hardware.empty()) { |
| LOG(ERROR) << "failed to get ro.hardware"; |
| return NULL; |
| } |
| |
| std::string fstab_path = "/fstab." + ro_hardware; |
| |
| fstab = fs_mgr_read_fstab(fstab_path.c_str()); |
| if (!fstab) { |
| LOG(ERROR) << "failed to read " << fstab_path; |
| return NULL; |
| } |
| |
| return fstab; |
| } |
| |
| static const char* find_block_device(const char* path, bool* encryptable, bool* encrypted) { |
| // Look for a volume whose mount point is the prefix of path and |
| // return its block device. Set encrypted if it's currently |
| // encrypted. |
| for (int i = 0; i < fstab->num_entries; ++i) { |
| struct fstab_rec* v = &fstab->recs[i]; |
| if (!v->mount_point) { |
| continue; |
| } |
| int len = strlen(v->mount_point); |
| if (strncmp(path, v->mount_point, len) == 0 && |
| (path[len] == '/' || path[len] == 0)) { |
| *encrypted = false; |
| *encryptable = false; |
| if (fs_mgr_is_encryptable(v) || fs_mgr_is_file_encrypted(v)) { |
| *encryptable = true; |
| if (android::base::GetProperty("ro.crypto.state", "") == "encrypted") { |
| *encrypted = true; |
| } |
| } |
| return v->blk_device; |
| } |
| } |
| |
| return NULL; |
| } |
| |
| static bool write_status_to_socket(int status, int socket) { |
| // If socket equals -1, uncrypt is in debug mode without socket communication. |
| // Skip writing and return success. |
| if (socket == -1) { |
| return true; |
| } |
| int status_out = htonl(status); |
| return android::base::WriteFully(socket, &status_out, sizeof(int)); |
| } |
| |
| // Parse uncrypt_file to find the update package name. |
| static bool find_uncrypt_package(const std::string& uncrypt_path_file, std::string* package_name) { |
| CHECK(package_name != nullptr); |
| std::string uncrypt_path; |
| if (!android::base::ReadFileToString(uncrypt_path_file, &uncrypt_path)) { |
| PLOG(ERROR) << "failed to open \"" << uncrypt_path_file << "\""; |
| return false; |
| } |
| |
| // Remove the trailing '\n' if present. |
| *package_name = android::base::Trim(uncrypt_path); |
| return true; |
| } |
| |
| static int produce_block_map(const char* path, const char* map_file, const char* blk_dev, |
| bool encrypted, int socket) { |
| std::string err; |
| if (!android::base::RemoveFileIfExists(map_file, &err)) { |
| LOG(ERROR) << "failed to remove the existing map file " << map_file << ": " << err; |
| return kUncryptFileRemoveError; |
| } |
| std::string tmp_map_file = std::string(map_file) + ".tmp"; |
| android::base::unique_fd mapfd(open(tmp_map_file.c_str(), |
| O_WRONLY | O_CREAT, S_IRUSR | S_IWUSR)); |
| if (mapfd == -1) { |
| PLOG(ERROR) << "failed to open " << tmp_map_file; |
| return kUncryptFileOpenError; |
| } |
| |
| // Make sure we can write to the socket. |
| if (!write_status_to_socket(0, socket)) { |
| LOG(ERROR) << "failed to write to socket " << socket; |
| return kUncryptSocketWriteError; |
| } |
| |
| struct stat sb; |
| if (stat(path, &sb) != 0) { |
| LOG(ERROR) << "failed to stat " << path; |
| return kUncryptFileStatError; |
| } |
| |
| LOG(INFO) << " block size: " << sb.st_blksize << " bytes"; |
| |
| int blocks = ((sb.st_size-1) / sb.st_blksize) + 1; |
| LOG(INFO) << " file size: " << sb.st_size << " bytes, " << blocks << " blocks"; |
| |
| std::vector<int> ranges; |
| |
| std::string s = android::base::StringPrintf("%s\n%" PRId64 " %" PRId64 "\n", |
| blk_dev, static_cast<int64_t>(sb.st_size), |
| static_cast<int64_t>(sb.st_blksize)); |
| if (!android::base::WriteStringToFd(s, mapfd)) { |
| PLOG(ERROR) << "failed to write " << tmp_map_file; |
| return kUncryptWriteError; |
| } |
| |
| std::vector<std::vector<unsigned char>> buffers; |
| if (encrypted) { |
| buffers.resize(WINDOW_SIZE, std::vector<unsigned char>(sb.st_blksize)); |
| } |
| int head_block = 0; |
| int head = 0, tail = 0; |
| |
| android::base::unique_fd fd(open(path, O_RDONLY)); |
| if (fd == -1) { |
| PLOG(ERROR) << "failed to open " << path << " for reading"; |
| return kUncryptFileOpenError; |
| } |
| |
| android::base::unique_fd wfd; |
| if (encrypted) { |
| wfd.reset(open(blk_dev, O_WRONLY)); |
| if (wfd == -1) { |
| PLOG(ERROR) << "failed to open " << blk_dev << " for writing"; |
| return kUncryptBlockOpenError; |
| } |
| } |
| |
| off64_t pos = 0; |
| int last_progress = 0; |
| while (pos < sb.st_size) { |
| // Update the status file, progress must be between [0, 99]. |
| int progress = static_cast<int>(100 * (double(pos) / double(sb.st_size))); |
| if (progress > last_progress) { |
| last_progress = progress; |
| write_status_to_socket(progress, socket); |
| } |
| |
| if ((tail+1) % WINDOW_SIZE == head) { |
| // write out head buffer |
| int block = head_block; |
| if (ioctl(fd, FIBMAP, &block) != 0) { |
| PLOG(ERROR) << "failed to find block " << head_block; |
| return kUncryptIoctlError; |
| } |
| add_block_to_ranges(ranges, block); |
| if (encrypted) { |
| if (write_at_offset(buffers[head].data(), sb.st_blksize, wfd, |
| static_cast<off64_t>(sb.st_blksize) * block) != 0) { |
| return kUncryptWriteError; |
| } |
| } |
| head = (head + 1) % WINDOW_SIZE; |
| ++head_block; |
| } |
| |
| // read next block to tail |
| if (encrypted) { |
| size_t to_read = static_cast<size_t>( |
| std::min(static_cast<off64_t>(sb.st_blksize), sb.st_size - pos)); |
| if (!android::base::ReadFully(fd, buffers[tail].data(), to_read)) { |
| PLOG(ERROR) << "failed to read " << path; |
| return kUncryptReadError; |
| } |
| pos += to_read; |
| } else { |
| // If we're not encrypting; we don't need to actually read |
| // anything, just skip pos forward as if we'd read a |
| // block. |
| pos += sb.st_blksize; |
| } |
| tail = (tail+1) % WINDOW_SIZE; |
| } |
| |
| while (head != tail) { |
| // write out head buffer |
| int block = head_block; |
| if (ioctl(fd, FIBMAP, &block) != 0) { |
| PLOG(ERROR) << "failed to find block " << head_block; |
| return kUncryptIoctlError; |
| } |
| add_block_to_ranges(ranges, block); |
| if (encrypted) { |
| if (write_at_offset(buffers[head].data(), sb.st_blksize, wfd, |
| static_cast<off64_t>(sb.st_blksize) * block) != 0) { |
| return kUncryptWriteError; |
| } |
| } |
| head = (head + 1) % WINDOW_SIZE; |
| ++head_block; |
| } |
| |
| if (!android::base::WriteStringToFd( |
| android::base::StringPrintf("%zu\n", ranges.size() / 2), mapfd)) { |
| PLOG(ERROR) << "failed to write " << tmp_map_file; |
| return kUncryptWriteError; |
| } |
| for (size_t i = 0; i < ranges.size(); i += 2) { |
| if (!android::base::WriteStringToFd( |
| android::base::StringPrintf("%d %d\n", ranges[i], ranges[i+1]), mapfd)) { |
| PLOG(ERROR) << "failed to write " << tmp_map_file; |
| return kUncryptWriteError; |
| } |
| } |
| |
| if (fsync(mapfd) == -1) { |
| PLOG(ERROR) << "failed to fsync \"" << tmp_map_file << "\""; |
| return kUncryptFileSyncError; |
| } |
| if (close(mapfd.release()) == -1) { |
| PLOG(ERROR) << "failed to close " << tmp_map_file; |
| return kUncryptFileCloseError; |
| } |
| |
| if (encrypted) { |
| if (fsync(wfd) == -1) { |
| PLOG(ERROR) << "failed to fsync \"" << blk_dev << "\""; |
| return kUncryptFileSyncError; |
| } |
| if (close(wfd.release()) == -1) { |
| PLOG(ERROR) << "failed to close " << blk_dev; |
| return kUncryptFileCloseError; |
| } |
| } |
| |
| if (rename(tmp_map_file.c_str(), map_file) == -1) { |
| PLOG(ERROR) << "failed to rename " << tmp_map_file << " to " << map_file; |
| return kUncryptFileRenameError; |
| } |
| // Sync dir to make rename() result written to disk. |
| std::string file_name = map_file; |
| std::string dir_name = dirname(&file_name[0]); |
| android::base::unique_fd dfd(open(dir_name.c_str(), O_RDONLY | O_DIRECTORY)); |
| if (dfd == -1) { |
| PLOG(ERROR) << "failed to open dir " << dir_name; |
| return kUncryptFileOpenError; |
| } |
| if (fsync(dfd) == -1) { |
| PLOG(ERROR) << "failed to fsync " << dir_name; |
| return kUncryptFileSyncError; |
| } |
| if (close(dfd.release()) == -1) { |
| PLOG(ERROR) << "failed to close " << dir_name; |
| return kUncryptFileCloseError; |
| } |
| return 0; |
| } |
| |
| static int uncrypt(const char* input_path, const char* map_file, const int socket) { |
| LOG(INFO) << "update package is \"" << input_path << "\""; |
| |
| // Turn the name of the file we're supposed to convert into an |
| // absolute path, so we can find what filesystem it's on. |
| char path[PATH_MAX+1]; |
| if (realpath(input_path, path) == NULL) { |
| PLOG(ERROR) << "failed to convert \"" << input_path << "\" to absolute path"; |
| return 1; |
| } |
| |
| bool encryptable; |
| bool encrypted; |
| const char* blk_dev = find_block_device(path, &encryptable, &encrypted); |
| if (blk_dev == NULL) { |
| LOG(ERROR) << "failed to find block device for " << path; |
| return 1; |
| } |
| |
| // If the filesystem it's on isn't encrypted, we only produce the |
| // block map, we don't rewrite the file contents (it would be |
| // pointless to do so). |
| LOG(INFO) << "encryptable: " << (encryptable ? "yes" : "no"); |
| LOG(INFO) << " encrypted: " << (encrypted ? "yes" : "no"); |
| |
| // Recovery supports installing packages from 3 paths: /cache, |
| // /data, and /sdcard. (On a particular device, other locations |
| // may work, but those are three we actually expect.) |
| // |
| // On /data we want to convert the file to a block map so that we |
| // can read the package without mounting the partition. On /cache |
| // and /sdcard we leave the file alone. |
| if (strncmp(path, "/data/", 6) == 0) { |
| LOG(INFO) << "writing block map " << map_file; |
| return produce_block_map(path, map_file, blk_dev, encrypted, socket); |
| } |
| |
| return 0; |
| } |
| |
| static void log_uncrypt_error_code(UncryptErrorCode error_code) { |
| if (!android::base::WriteStringToFile(android::base::StringPrintf( |
| "uncrypt_error: %d\n", error_code), UNCRYPT_STATUS)) { |
| PLOG(WARNING) << "failed to write to " << UNCRYPT_STATUS; |
| } |
| } |
| |
| static bool uncrypt_wrapper(const char* input_path, const char* map_file, const int socket) { |
| // Initialize the uncrypt error to kUncryptErrorPlaceholder. |
| log_uncrypt_error_code(kUncryptErrorPlaceholder); |
| |
| std::string package; |
| if (input_path == nullptr) { |
| if (!find_uncrypt_package(UNCRYPT_PATH_FILE, &package)) { |
| write_status_to_socket(-1, socket); |
| // Overwrite the error message. |
| log_uncrypt_error_code(kUncryptPackageMissingError); |
| return false; |
| } |
| input_path = package.c_str(); |
| } |
| CHECK(map_file != nullptr); |
| |
| auto start = std::chrono::system_clock::now(); |
| int status = uncrypt(input_path, map_file, socket); |
| std::chrono::duration<double> duration = std::chrono::system_clock::now() - start; |
| int count = static_cast<int>(duration.count()); |
| |
| std::string uncrypt_message = android::base::StringPrintf("uncrypt_time: %d\n", count); |
| if (status != 0) { |
| // Log the time cost and error code if uncrypt fails. |
| uncrypt_message += android::base::StringPrintf("uncrypt_error: %d\n", status); |
| if (!android::base::WriteStringToFile(uncrypt_message, UNCRYPT_STATUS)) { |
| PLOG(WARNING) << "failed to write to " << UNCRYPT_STATUS; |
| } |
| |
| write_status_to_socket(-1, socket); |
| return false; |
| } |
| |
| if (!android::base::WriteStringToFile(uncrypt_message, UNCRYPT_STATUS)) { |
| PLOG(WARNING) << "failed to write to " << UNCRYPT_STATUS; |
| } |
| |
| write_status_to_socket(100, socket); |
| |
| return true; |
| } |
| |
| static bool clear_bcb(const int socket) { |
| std::string err; |
| if (!clear_bootloader_message(&err)) { |
| LOG(ERROR) << "failed to clear bootloader message: " << err; |
| write_status_to_socket(-1, socket); |
| return false; |
| } |
| write_status_to_socket(100, socket); |
| return true; |
| } |
| |
| static bool setup_bcb(const int socket) { |
| // c5. receive message length |
| int length; |
| if (!android::base::ReadFully(socket, &length, 4)) { |
| PLOG(ERROR) << "failed to read the length"; |
| return false; |
| } |
| length = ntohl(length); |
| |
| // c7. receive message |
| std::string content; |
| content.resize(length); |
| if (!android::base::ReadFully(socket, &content[0], length)) { |
| PLOG(ERROR) << "failed to read the length"; |
| return false; |
| } |
| LOG(INFO) << " received command: [" << content << "] (" << content.size() << ")"; |
| std::vector<std::string> options = android::base::Split(content, "\n"); |
| std::string wipe_package; |
| for (auto& option : options) { |
| if (android::base::StartsWith(option, "--wipe_package=")) { |
| std::string path = option.substr(strlen("--wipe_package=")); |
| if (!android::base::ReadFileToString(path, &wipe_package)) { |
| PLOG(ERROR) << "failed to read " << path; |
| return false; |
| } |
| option = android::base::StringPrintf("--wipe_package_size=%zu", wipe_package.size()); |
| } |
| } |
| |
| // c8. setup the bcb command |
| std::string err; |
| if (!write_bootloader_message(options, &err)) { |
| LOG(ERROR) << "failed to set bootloader message: " << err; |
| write_status_to_socket(-1, socket); |
| return false; |
| } |
| if (!wipe_package.empty() && !write_wipe_package(wipe_package, &err)) { |
| PLOG(ERROR) << "failed to set wipe package: " << err; |
| write_status_to_socket(-1, socket); |
| return false; |
| } |
| // c10. send "100" status |
| write_status_to_socket(100, socket); |
| return true; |
| } |
| |
| static void usage(const char* exename) { |
| fprintf(stderr, "Usage of %s:\n", exename); |
| fprintf(stderr, "%s [<package_path> <map_file>] Uncrypt ota package.\n", exename); |
| fprintf(stderr, "%s --clear-bcb Clear BCB data in misc partition.\n", exename); |
| fprintf(stderr, "%s --setup-bcb Setup BCB data by command file.\n", exename); |
| } |
| |
| int main(int argc, char** argv) { |
| enum { UNCRYPT, SETUP_BCB, CLEAR_BCB, UNCRYPT_DEBUG } action; |
| const char* input_path = nullptr; |
| const char* map_file = CACHE_BLOCK_MAP.c_str(); |
| |
| if (argc == 2 && strcmp(argv[1], "--clear-bcb") == 0) { |
| action = CLEAR_BCB; |
| } else if (argc == 2 && strcmp(argv[1], "--setup-bcb") == 0) { |
| action = SETUP_BCB; |
| } else if (argc == 1) { |
| action = UNCRYPT; |
| } else if (argc == 3) { |
| input_path = argv[1]; |
| map_file = argv[2]; |
| action = UNCRYPT_DEBUG; |
| } else { |
| usage(argv[0]); |
| return 2; |
| } |
| |
| if ((fstab = read_fstab()) == nullptr) { |
| log_uncrypt_error_code(kUncryptFstabReadError); |
| return 1; |
| } |
| |
| if (action == UNCRYPT_DEBUG) { |
| LOG(INFO) << "uncrypt called in debug mode, skip socket communication"; |
| bool success = uncrypt_wrapper(input_path, map_file, -1); |
| if (success) { |
| LOG(INFO) << "uncrypt succeeded"; |
| } else{ |
| LOG(INFO) << "uncrypt failed"; |
| } |
| return success ? 0 : 1; |
| } |
| |
| // c3. The socket is created by init when starting the service. uncrypt |
| // will use the socket to communicate with its caller. |
| android::base::unique_fd service_socket(android_get_control_socket(UNCRYPT_SOCKET.c_str())); |
| if (service_socket == -1) { |
| PLOG(ERROR) << "failed to open socket \"" << UNCRYPT_SOCKET << "\""; |
| log_uncrypt_error_code(kUncryptSocketOpenError); |
| return 1; |
| } |
| fcntl(service_socket, F_SETFD, FD_CLOEXEC); |
| |
| if (listen(service_socket, 1) == -1) { |
| PLOG(ERROR) << "failed to listen on socket " << service_socket.get(); |
| log_uncrypt_error_code(kUncryptSocketListenError); |
| return 1; |
| } |
| |
| android::base::unique_fd socket_fd(accept4(service_socket, nullptr, nullptr, SOCK_CLOEXEC)); |
| if (socket_fd == -1) { |
| PLOG(ERROR) << "failed to accept on socket " << service_socket.get(); |
| log_uncrypt_error_code(kUncryptSocketAcceptError); |
| return 1; |
| } |
| |
| bool success = false; |
| switch (action) { |
| case UNCRYPT: |
| success = uncrypt_wrapper(input_path, map_file, socket_fd); |
| break; |
| case SETUP_BCB: |
| success = setup_bcb(socket_fd); |
| break; |
| case CLEAR_BCB: |
| success = clear_bcb(socket_fd); |
| break; |
| default: // Should never happen. |
| LOG(ERROR) << "Invalid uncrypt action code: " << action; |
| return 1; |
| } |
| |
| // c13. Read a 4-byte code from the client before uncrypt exits. This is to |
| // ensure the client to receive the last status code before the socket gets |
| // destroyed. |
| int code; |
| if (android::base::ReadFully(socket_fd, &code, 4)) { |
| LOG(INFO) << " received " << code << ", exiting now"; |
| } else { |
| PLOG(ERROR) << "failed to read the code"; |
| } |
| return success ? 0 : 1; |
| } |