blob: d1970e53469da615271a15288fffee6afb403112 [file] [log] [blame]
Doug Zongker76adfc52014-01-13 10:04:25 -08001/*
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
Tao Bao3a2bb592016-02-25 12:38:53 -080042/**
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>
Elliott Hughesd4d4c242014-12-29 12:46:43 -080089#include <errno.h>
Tao Bao75238632015-05-27 14:46:17 -070090#include <fcntl.h>
Tao Baob8df5fb2015-12-08 22:47:25 -080091#include <inttypes.h>
Yabin Cui25dd0382016-02-01 11:40:37 -080092#include <libgen.h>
Tao Bao75238632015-05-27 14:46:17 -070093#include <linux/fs.h>
94#include <stdarg.h>
Doug Zongker76adfc52014-01-13 10:04:25 -080095#include <stdio.h>
96#include <stdlib.h>
Elliott Hughescd3c55a2015-01-29 20:50:08 -080097#include <string.h>
Doug Zongker76adfc52014-01-13 10:04:25 -080098#include <sys/mman.h>
Tao Bao3a2bb592016-02-25 12:38:53 -080099#include <sys/socket.h>
Tao Bao383b00d2015-05-21 16:44:44 -0700100#include <sys/stat.h>
101#include <sys/types.h>
Tao Bao75238632015-05-27 14:46:17 -0700102#include <unistd.h>
Doug Zongker76adfc52014-01-13 10:04:25 -0800103
Yabin Cui25dd0382016-02-01 11:40:37 -0800104#include <algorithm>
Tao Baoc7547922015-08-06 18:35:05 -0700105#include <memory>
Yabin Cui25dd0382016-02-01 11:40:37 -0800106#include <vector>
Tao Baoc7547922015-08-06 18:35:05 -0700107
Elliott Hughes4b166f02015-12-04 15:30:20 -0800108#include <android-base/file.h>
Yabin Cui2d46da52016-01-26 16:50:15 -0800109#include <android-base/logging.h>
Elliott Hughes91e3aee2016-09-23 15:30:55 -0700110#include <android-base/properties.h>
Yabin Cui25dd0382016-02-01 11:40:37 -0800111#include <android-base/stringprintf.h>
Elliott Hughes4b166f02015-12-04 15:30:20 -0800112#include <android-base/strings.h>
Elliott Hughesbcabd092016-03-22 20:19:22 -0700113#include <android-base/unique_fd.h>
Yabin Cui2f272c02016-06-24 18:22:02 -0700114#include <bootloader_message/bootloader_message.h>
Tao Bao75238632015-05-27 14:46:17 -0700115#include <cutils/android_reboot.h>
Tao Bao3a2bb592016-02-25 12:38:53 -0800116#include <cutils/sockets.h>
Doug Zongker76adfc52014-01-13 10:04:25 -0800117#include <fs_mgr.h>
118
Tao Bao1fc5bf32017-10-06 07:43:41 -0700119#include "otautil/error_code.h"
Tianjie Xuda44cf12016-09-24 15:31:34 -0700120
Tianjie Xubc426032016-11-11 13:53:25 -0800121static constexpr int WINDOW_SIZE = 5;
122static constexpr int FIBMAP_RETRY_LIMIT = 3;
Tao Bao383b00d2015-05-21 16:44:44 -0700123
Tao Bao3a2bb592016-02-25 12:38:53 -0800124// uncrypt provides three services: SETUP_BCB, CLEAR_BCB and UNCRYPT.
125//
126// SETUP_BCB and CLEAR_BCB services use socket communication and do not rely
127// on /cache partitions. They will handle requests to reboot into recovery
128// (for applying updates for non-A/B devices, or factory resets for all
129// devices).
130//
131// UNCRYPT service still needs files on /cache partition (UNCRYPT_PATH_FILE
132// and CACHE_BLOCK_MAP). It will be working (and needed) only for non-A/B
133// devices, on which /cache partitions always exist.
Yabin Cui2d46da52016-01-26 16:50:15 -0800134static const std::string CACHE_BLOCK_MAP = "/cache/recovery/block.map";
Yabin Cui2d46da52016-01-26 16:50:15 -0800135static const std::string UNCRYPT_PATH_FILE = "/cache/recovery/uncrypt_file";
Tianjie Xue16e7992016-09-09 10:55:44 -0700136static const std::string UNCRYPT_STATUS = "/cache/recovery/uncrypt_status";
Tao Bao3a2bb592016-02-25 12:38:53 -0800137static const std::string UNCRYPT_SOCKET = "uncrypt";
Doug Zongker76adfc52014-01-13 10:04:25 -0800138
Tao Bao3a2bb592016-02-25 12:38:53 -0800139static struct fstab* fstab = nullptr;
Doug Zongker2efc9d92014-08-18 15:55:28 -0700140
Tao Bao381f4552015-05-05 18:36:45 -0700141static int write_at_offset(unsigned char* buffer, size_t size, int wfd, off64_t offset) {
Elliott Hughes7bad7c42015-04-28 17:24:24 -0700142 if (TEMP_FAILURE_RETRY(lseek64(wfd, offset, SEEK_SET)) == -1) {
Tianjie Xu74778142016-08-05 18:00:04 -0700143 PLOG(ERROR) << "error seeking to offset " << offset;
Elliott Hughes7bad7c42015-04-28 17:24:24 -0700144 return -1;
145 }
Yabin Cui25dd0382016-02-01 11:40:37 -0800146 if (!android::base::WriteFully(wfd, buffer, size)) {
Tianjie Xu74778142016-08-05 18:00:04 -0700147 PLOG(ERROR) << "error writing offset " << offset;
Yabin Cui25dd0382016-02-01 11:40:37 -0800148 return -1;
Doug Zongker76adfc52014-01-13 10:04:25 -0800149 }
150 return 0;
151}
152
Yabin Cui25dd0382016-02-01 11:40:37 -0800153static void add_block_to_ranges(std::vector<int>& ranges, int new_block) {
154 if (!ranges.empty() && new_block == ranges.back()) {
Doug Zongker76adfc52014-01-13 10:04:25 -0800155 // If the new block comes immediately after the current range,
156 // all we have to do is extend the current range.
Yabin Cui25dd0382016-02-01 11:40:37 -0800157 ++ranges.back();
Doug Zongker76adfc52014-01-13 10:04:25 -0800158 } else {
159 // We need to start a new range.
Yabin Cui25dd0382016-02-01 11:40:37 -0800160 ranges.push_back(new_block);
161 ranges.push_back(new_block + 1);
Doug Zongker76adfc52014-01-13 10:04:25 -0800162 }
163}
164
Tao Bao381f4552015-05-05 18:36:45 -0700165static struct fstab* read_fstab() {
Bowgo Tsaid13b6cf2017-03-10 16:00:40 +0800166 fstab = fs_mgr_read_fstab_default();
Doug Zongker76adfc52014-01-13 10:04:25 -0800167 if (!fstab) {
Bowgo Tsaid13b6cf2017-03-10 16:00:40 +0800168 LOG(ERROR) << "failed to read default fstab";
Doug Zongker76adfc52014-01-13 10:04:25 -0800169 return NULL;
170 }
171
Doug Zongker2efc9d92014-08-18 15:55:28 -0700172 return fstab;
173}
174
Jaegeuk Kimb6e6ee72017-12-08 13:19:23 -0800175static const char* find_block_device(const char* path, bool* encryptable,
176 bool* encrypted, bool* f2fs_fs) {
Doug Zongker76adfc52014-01-13 10:04:25 -0800177 // Look for a volume whose mount point is the prefix of path and
178 // return its block device. Set encrypted if it's currently
179 // encrypted.
Jaegeuk Kimb6e6ee72017-12-08 13:19:23 -0800180
181 // ensure f2fs_fs is set to false first.
182 *f2fs_fs = false;
183
Tao Bao381f4552015-05-05 18:36:45 -0700184 for (int i = 0; i < fstab->num_entries; ++i) {
Doug Zongker76adfc52014-01-13 10:04:25 -0800185 struct fstab_rec* v = &fstab->recs[i];
Tao Bao381f4552015-05-05 18:36:45 -0700186 if (!v->mount_point) {
187 continue;
188 }
Doug Zongker76adfc52014-01-13 10:04:25 -0800189 int len = strlen(v->mount_point);
190 if (strncmp(path, v->mount_point, len) == 0 &&
191 (path[len] == '/' || path[len] == 0)) {
Tao Bao381f4552015-05-05 18:36:45 -0700192 *encrypted = false;
193 *encryptable = false;
Tao Bao7cf50c62015-07-16 20:04:13 -0700194 if (fs_mgr_is_encryptable(v) || fs_mgr_is_file_encrypted(v)) {
Tao Bao381f4552015-05-05 18:36:45 -0700195 *encryptable = true;
Elliott Hughes91e3aee2016-09-23 15:30:55 -0700196 if (android::base::GetProperty("ro.crypto.state", "") == "encrypted") {
Tao Bao381f4552015-05-05 18:36:45 -0700197 *encrypted = true;
Doug Zongker76adfc52014-01-13 10:04:25 -0800198 }
199 }
Jaegeuk Kimb6e6ee72017-12-08 13:19:23 -0800200 if (strcmp(v->fs_type, "f2fs") == 0) {
201 *f2fs_fs = true;
202 }
Doug Zongker76adfc52014-01-13 10:04:25 -0800203 return v->blk_device;
204 }
205 }
206
207 return NULL;
208}
209
Tao Bao3a2bb592016-02-25 12:38:53 -0800210static bool write_status_to_socket(int status, int socket) {
Tianjie Xu28c1e5d2016-06-30 15:31:51 -0700211 // If socket equals -1, uncrypt is in debug mode without socket communication.
212 // Skip writing and return success.
213 if (socket == -1) {
214 return true;
215 }
Tao Bao3a2bb592016-02-25 12:38:53 -0800216 int status_out = htonl(status);
217 return android::base::WriteFully(socket, &status_out, sizeof(int));
218}
219
Tao Bao383b00d2015-05-21 16:44:44 -0700220// Parse uncrypt_file to find the update package name.
Yabin Cui2d46da52016-01-26 16:50:15 -0800221static 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)) {
Tianjie Xu74778142016-08-05 18:00:04 -0700225 PLOG(ERROR) << "failed to open \"" << uncrypt_path_file << "\"";
Tao Bao383b00d2015-05-21 16:44:44 -0700226 return false;
Maxim Siniavinee7b28882014-02-13 15:48:53 -0800227 }
Doug Zongker76adfc52014-01-13 10:04:25 -0800228
Tao Bao383b00d2015-05-21 16:44:44 -0700229 // Remove the trailing '\n' if present.
Yabin Cui2d46da52016-01-26 16:50:15 -0800230 *package_name = android::base::Trim(uncrypt_path);
Tao Bao383b00d2015-05-21 16:44:44 -0700231 return true;
Doug Zongker76adfc52014-01-13 10:04:25 -0800232}
233
Tianjie Xubc426032016-11-11 13:53:25 -0800234static int retry_fibmap(const int fd, const char* name, int* block, const int head_block) {
235 CHECK(block != nullptr);
236 for (size_t i = 0; i < FIBMAP_RETRY_LIMIT; i++) {
237 if (fsync(fd) == -1) {
238 PLOG(ERROR) << "failed to fsync \"" << name << "\"";
239 return kUncryptFileSyncError;
240 }
241 if (ioctl(fd, FIBMAP, block) != 0) {
242 PLOG(ERROR) << "failed to find block " << head_block;
243 return kUncryptIoctlError;
244 }
245 if (*block != 0) {
246 return kUncryptNoError;
247 }
248 sleep(1);
249 }
250 LOG(ERROR) << "fibmap of " << head_block << "always returns 0";
251 return kUncryptIoctlError;
252}
253
Tao Bao381f4552015-05-05 18:36:45 -0700254static int produce_block_map(const char* path, const char* map_file, const char* blk_dev,
Jaegeuk Kimb6e6ee72017-12-08 13:19:23 -0800255 bool encrypted, bool f2fs_fs, int socket) {
Yabin Cui25dd0382016-02-01 11:40:37 -0800256 std::string err;
257 if (!android::base::RemoveFileIfExists(map_file, &err)) {
Tianjie Xu74778142016-08-05 18:00:04 -0700258 LOG(ERROR) << "failed to remove the existing map file " << map_file << ": " << err;
Tianjie Xuda44cf12016-09-24 15:31:34 -0700259 return kUncryptFileRemoveError;
Sungmin Choia72512c2014-12-10 21:57:09 +0900260 }
Yabin Cui25dd0382016-02-01 11:40:37 -0800261 std::string tmp_map_file = std::string(map_file) + ".tmp";
Elliott Hughesbcabd092016-03-22 20:19:22 -0700262 android::base::unique_fd mapfd(open(tmp_map_file.c_str(),
263 O_WRONLY | O_CREAT, S_IRUSR | S_IWUSR));
264 if (mapfd == -1) {
Tianjie Xu74778142016-08-05 18:00:04 -0700265 PLOG(ERROR) << "failed to open " << tmp_map_file;
Tianjie Xuda44cf12016-09-24 15:31:34 -0700266 return kUncryptFileOpenError;
Yabin Cui25dd0382016-02-01 11:40:37 -0800267 }
Doug Zongker76adfc52014-01-13 10:04:25 -0800268
Tao Bao3a2bb592016-02-25 12:38:53 -0800269 // Make sure we can write to the socket.
270 if (!write_status_to_socket(0, socket)) {
Tianjie Xu74778142016-08-05 18:00:04 -0700271 LOG(ERROR) << "failed to write to socket " << socket;
Tianjie Xuda44cf12016-09-24 15:31:34 -0700272 return kUncryptSocketWriteError;
Tao Bao383b00d2015-05-21 16:44:44 -0700273 }
274
Tao Bao381f4552015-05-05 18:36:45 -0700275 struct stat sb;
Tao Baoc7547922015-08-06 18:35:05 -0700276 if (stat(path, &sb) != 0) {
Tianjie Xu74778142016-08-05 18:00:04 -0700277 LOG(ERROR) << "failed to stat " << path;
Tianjie Xuda44cf12016-09-24 15:31:34 -0700278 return kUncryptFileStatError;
Doug Zongker76adfc52014-01-13 10:04:25 -0800279 }
280
Tianjie Xu74778142016-08-05 18:00:04 -0700281 LOG(INFO) << " block size: " << sb.st_blksize << " bytes";
Doug Zongker76adfc52014-01-13 10:04:25 -0800282
283 int blocks = ((sb.st_size-1) / sb.st_blksize) + 1;
Tianjie Xu74778142016-08-05 18:00:04 -0700284 LOG(INFO) << " file size: " << sb.st_size << " bytes, " << blocks << " blocks";
Doug Zongker76adfc52014-01-13 10:04:25 -0800285
Yabin Cui25dd0382016-02-01 11:40:37 -0800286 std::vector<int> ranges;
Doug Zongker76adfc52014-01-13 10:04:25 -0800287
Chih-Hung Hsieh54a27472016-04-18 11:30:55 -0700288 std::string s = android::base::StringPrintf("%s\n%" PRId64 " %" PRId64 "\n",
289 blk_dev, static_cast<int64_t>(sb.st_size),
290 static_cast<int64_t>(sb.st_blksize));
Elliott Hughesbcabd092016-03-22 20:19:22 -0700291 if (!android::base::WriteStringToFd(s, mapfd)) {
Tianjie Xu74778142016-08-05 18:00:04 -0700292 PLOG(ERROR) << "failed to write " << tmp_map_file;
Tianjie Xuda44cf12016-09-24 15:31:34 -0700293 return kUncryptWriteError;
Yabin Cui25dd0382016-02-01 11:40:37 -0800294 }
Doug Zongker76adfc52014-01-13 10:04:25 -0800295
Yabin Cui25dd0382016-02-01 11:40:37 -0800296 std::vector<std::vector<unsigned char>> buffers;
Doug Zongker76adfc52014-01-13 10:04:25 -0800297 if (encrypted) {
Yabin Cui25dd0382016-02-01 11:40:37 -0800298 buffers.resize(WINDOW_SIZE, std::vector<unsigned char>(sb.st_blksize));
Doug Zongker76adfc52014-01-13 10:04:25 -0800299 }
300 int head_block = 0;
301 int head = 0, tail = 0;
Doug Zongker76adfc52014-01-13 10:04:25 -0800302
Jaegeuk Kim051b9d82018-09-10 17:23:27 -0700303 android::base::unique_fd fd(open(path, O_RDWR));
Elliott Hughesbcabd092016-03-22 20:19:22 -0700304 if (fd == -1) {
Tianjie Xu74778142016-08-05 18:00:04 -0700305 PLOG(ERROR) << "failed to open " << path << " for reading";
Tianjie Xuda44cf12016-09-24 15:31:34 -0700306 return kUncryptFileOpenError;
Doug Zongker76adfc52014-01-13 10:04:25 -0800307 }
Doug Zongker76adfc52014-01-13 10:04:25 -0800308
Elliott Hughesbcabd092016-03-22 20:19:22 -0700309 android::base::unique_fd wfd;
Doug Zongker76adfc52014-01-13 10:04:25 -0800310 if (encrypted) {
Elliott Hughesbcabd092016-03-22 20:19:22 -0700311 wfd.reset(open(blk_dev, O_WRONLY));
312 if (wfd == -1) {
Tianjie Xu74778142016-08-05 18:00:04 -0700313 PLOG(ERROR) << "failed to open " << blk_dev << " for writing";
Tianjie Xuda44cf12016-09-24 15:31:34 -0700314 return kUncryptBlockOpenError;
Doug Zongker76adfc52014-01-13 10:04:25 -0800315 }
316 }
317
Jaegeuk Kimb6e6ee72017-12-08 13:19:23 -0800318// F2FS-specific ioctl
319// It requires the below kernel commit merged in v4.16-rc1.
320// 1ad71a27124c ("f2fs: add an ioctl to disable GC for specific file")
321// In android-4.4,
322// 56ee1e817908 ("f2fs: updates on v4.16-rc1")
323// In android-4.9,
324// 2f17e34672a8 ("f2fs: updates on v4.16-rc1")
325// In android-4.14,
326// ce767d9a55bc ("f2fs: updates on v4.16-rc1")
327#ifndef F2FS_IOC_SET_PIN_FILE
328#ifndef F2FS_IOCTL_MAGIC
329#define F2FS_IOCTL_MAGIC 0xf5
330#endif
331#define F2FS_IOC_SET_PIN_FILE _IOW(F2FS_IOCTL_MAGIC, 13, __u32)
Devin Kim29472c72018-09-12 08:42:49 -0700332#define F2FS_IOC_GET_PIN_FILE _IOR(F2FS_IOCTL_MAGIC, 14, __u32)
Jaegeuk Kimb6e6ee72017-12-08 13:19:23 -0800333#endif
334 if (f2fs_fs) {
Jaegeuk Kim2669da02018-07-23 15:38:35 -0700335 __u32 set = 1;
336 int error = ioctl(fd, F2FS_IOC_SET_PIN_FILE, &set);
Jaegeuk Kimb6e6ee72017-12-08 13:19:23 -0800337 // Don't break the old kernels which don't support it.
338 if (error && errno != ENOTTY && errno != ENOTSUP) {
339 PLOG(ERROR) << "Failed to set pin_file for f2fs: " << path << " on " << blk_dev;
340 return kUncryptIoctlError;
341 }
342 }
343
Tao Baob8df5fb2015-12-08 22:47:25 -0800344 off64_t pos = 0;
Tao Bao383b00d2015-05-21 16:44:44 -0700345 int last_progress = 0;
Doug Zongker76adfc52014-01-13 10:04:25 -0800346 while (pos < sb.st_size) {
Tao Bao383b00d2015-05-21 16:44:44 -0700347 // Update the status file, progress must be between [0, 99].
348 int progress = static_cast<int>(100 * (double(pos) / double(sb.st_size)));
349 if (progress > last_progress) {
Tao Bao3a2bb592016-02-25 12:38:53 -0800350 last_progress = progress;
351 write_status_to_socket(progress, socket);
Tao Bao383b00d2015-05-21 16:44:44 -0700352 }
353
Doug Zongker76adfc52014-01-13 10:04:25 -0800354 if ((tail+1) % WINDOW_SIZE == head) {
355 // write out head buffer
356 int block = head_block;
Elliott Hughesbcabd092016-03-22 20:19:22 -0700357 if (ioctl(fd, FIBMAP, &block) != 0) {
Tianjie Xuda44cf12016-09-24 15:31:34 -0700358 PLOG(ERROR) << "failed to find block " << head_block;
359 return kUncryptIoctlError;
Doug Zongker76adfc52014-01-13 10:04:25 -0800360 }
Tianjie Xubc426032016-11-11 13:53:25 -0800361
362 if (block == 0) {
363 LOG(ERROR) << "failed to find block " << head_block << ", retrying";
364 int error = retry_fibmap(fd, path, &block, head_block);
365 if (error != kUncryptNoError) {
366 return error;
367 }
368 }
369
Yabin Cui25dd0382016-02-01 11:40:37 -0800370 add_block_to_ranges(ranges, block);
Doug Zongker76adfc52014-01-13 10:04:25 -0800371 if (encrypted) {
Elliott Hughesbcabd092016-03-22 20:19:22 -0700372 if (write_at_offset(buffers[head].data(), sb.st_blksize, wfd,
373 static_cast<off64_t>(sb.st_blksize) * block) != 0) {
Tianjie Xuda44cf12016-09-24 15:31:34 -0700374 return kUncryptWriteError;
Doug Zongker76adfc52014-01-13 10:04:25 -0800375 }
376 }
377 head = (head + 1) % WINDOW_SIZE;
378 ++head_block;
379 }
380
381 // read next block to tail
382 if (encrypted) {
Yabin Cui25dd0382016-02-01 11:40:37 -0800383 size_t to_read = static_cast<size_t>(
384 std::min(static_cast<off64_t>(sb.st_blksize), sb.st_size - pos));
Elliott Hughesbcabd092016-03-22 20:19:22 -0700385 if (!android::base::ReadFully(fd, buffers[tail].data(), to_read)) {
Tianjie Xu74778142016-08-05 18:00:04 -0700386 PLOG(ERROR) << "failed to read " << path;
Tianjie Xuda44cf12016-09-24 15:31:34 -0700387 return kUncryptReadError;
Doug Zongker76adfc52014-01-13 10:04:25 -0800388 }
Yabin Cui25dd0382016-02-01 11:40:37 -0800389 pos += to_read;
Doug Zongker76adfc52014-01-13 10:04:25 -0800390 } else {
391 // If we're not encrypting; we don't need to actually read
392 // anything, just skip pos forward as if we'd read a
393 // block.
394 pos += sb.st_blksize;
395 }
396 tail = (tail+1) % WINDOW_SIZE;
397 }
398
399 while (head != tail) {
400 // write out head buffer
401 int block = head_block;
Elliott Hughesbcabd092016-03-22 20:19:22 -0700402 if (ioctl(fd, FIBMAP, &block) != 0) {
Tianjie Xuda44cf12016-09-24 15:31:34 -0700403 PLOG(ERROR) << "failed to find block " << head_block;
404 return kUncryptIoctlError;
Doug Zongker76adfc52014-01-13 10:04:25 -0800405 }
Tianjie Xubc426032016-11-11 13:53:25 -0800406
407 if (block == 0) {
408 LOG(ERROR) << "failed to find block " << head_block << ", retrying";
409 int error = retry_fibmap(fd, path, &block, head_block);
410 if (error != kUncryptNoError) {
411 return error;
412 }
413 }
414
Yabin Cui25dd0382016-02-01 11:40:37 -0800415 add_block_to_ranges(ranges, block);
Doug Zongker76adfc52014-01-13 10:04:25 -0800416 if (encrypted) {
Elliott Hughesbcabd092016-03-22 20:19:22 -0700417 if (write_at_offset(buffers[head].data(), sb.st_blksize, wfd,
418 static_cast<off64_t>(sb.st_blksize) * block) != 0) {
Tianjie Xuda44cf12016-09-24 15:31:34 -0700419 return kUncryptWriteError;
Doug Zongker76adfc52014-01-13 10:04:25 -0800420 }
421 }
422 head = (head + 1) % WINDOW_SIZE;
423 ++head_block;
424 }
425
Yabin Cui25dd0382016-02-01 11:40:37 -0800426 if (!android::base::WriteStringToFd(
Elliott Hughesbcabd092016-03-22 20:19:22 -0700427 android::base::StringPrintf("%zu\n", ranges.size() / 2), mapfd)) {
Tianjie Xu74778142016-08-05 18:00:04 -0700428 PLOG(ERROR) << "failed to write " << tmp_map_file;
Tianjie Xuda44cf12016-09-24 15:31:34 -0700429 return kUncryptWriteError;
Tao Baofb4ccef2015-05-04 10:10:13 -0700430 }
Yabin Cui25dd0382016-02-01 11:40:37 -0800431 for (size_t i = 0; i < ranges.size(); i += 2) {
432 if (!android::base::WriteStringToFd(
Elliott Hughesbcabd092016-03-22 20:19:22 -0700433 android::base::StringPrintf("%d %d\n", ranges[i], ranges[i+1]), mapfd)) {
Tianjie Xu74778142016-08-05 18:00:04 -0700434 PLOG(ERROR) << "failed to write " << tmp_map_file;
Tianjie Xuda44cf12016-09-24 15:31:34 -0700435 return kUncryptWriteError;
Tao Baofb4ccef2015-05-04 10:10:13 -0700436 }
Doug Zongker76adfc52014-01-13 10:04:25 -0800437 }
438
Elliott Hughesbcabd092016-03-22 20:19:22 -0700439 if (fsync(mapfd) == -1) {
Tianjie Xu74778142016-08-05 18:00:04 -0700440 PLOG(ERROR) << "failed to fsync \"" << tmp_map_file << "\"";
Tianjie Xuda44cf12016-09-24 15:31:34 -0700441 return kUncryptFileSyncError;
Yabin Cui25dd0382016-02-01 11:40:37 -0800442 }
Elliott Hughesbcabd092016-03-22 20:19:22 -0700443 if (close(mapfd.release()) == -1) {
Tianjie Xu74778142016-08-05 18:00:04 -0700444 PLOG(ERROR) << "failed to close " << tmp_map_file;
Tianjie Xuda44cf12016-09-24 15:31:34 -0700445 return kUncryptFileCloseError;
Yabin Cui25dd0382016-02-01 11:40:37 -0800446 }
Yabin Cui25dd0382016-02-01 11:40:37 -0800447
448 if (encrypted) {
Elliott Hughesbcabd092016-03-22 20:19:22 -0700449 if (fsync(wfd) == -1) {
Tianjie Xu74778142016-08-05 18:00:04 -0700450 PLOG(ERROR) << "failed to fsync \"" << blk_dev << "\"";
Tianjie Xuda44cf12016-09-24 15:31:34 -0700451 return kUncryptFileSyncError;
Yabin Cui25dd0382016-02-01 11:40:37 -0800452 }
Elliott Hughesbcabd092016-03-22 20:19:22 -0700453 if (close(wfd.release()) == -1) {
Tianjie Xu74778142016-08-05 18:00:04 -0700454 PLOG(ERROR) << "failed to close " << blk_dev;
Tianjie Xuda44cf12016-09-24 15:31:34 -0700455 return kUncryptFileCloseError;
Yabin Cui25dd0382016-02-01 11:40:37 -0800456 }
Yabin Cui25dd0382016-02-01 11:40:37 -0800457 }
458
459 if (rename(tmp_map_file.c_str(), map_file) == -1) {
Tianjie Xu74778142016-08-05 18:00:04 -0700460 PLOG(ERROR) << "failed to rename " << tmp_map_file << " to " << map_file;
Tianjie Xuda44cf12016-09-24 15:31:34 -0700461 return kUncryptFileRenameError;
Yabin Cui25dd0382016-02-01 11:40:37 -0800462 }
463 // Sync dir to make rename() result written to disk.
464 std::string file_name = map_file;
465 std::string dir_name = dirname(&file_name[0]);
Elliott Hughesbcabd092016-03-22 20:19:22 -0700466 android::base::unique_fd dfd(open(dir_name.c_str(), O_RDONLY | O_DIRECTORY));
467 if (dfd == -1) {
Tianjie Xu74778142016-08-05 18:00:04 -0700468 PLOG(ERROR) << "failed to open dir " << dir_name;
Tianjie Xuda44cf12016-09-24 15:31:34 -0700469 return kUncryptFileOpenError;
Yabin Cui25dd0382016-02-01 11:40:37 -0800470 }
Elliott Hughesbcabd092016-03-22 20:19:22 -0700471 if (fsync(dfd) == -1) {
Tianjie Xu74778142016-08-05 18:00:04 -0700472 PLOG(ERROR) << "failed to fsync " << dir_name;
Tianjie Xuda44cf12016-09-24 15:31:34 -0700473 return kUncryptFileSyncError;
Yabin Cui25dd0382016-02-01 11:40:37 -0800474 }
Elliott Hughesbcabd092016-03-22 20:19:22 -0700475 if (close(dfd.release()) == -1) {
Tianjie Xu74778142016-08-05 18:00:04 -0700476 PLOG(ERROR) << "failed to close " << dir_name;
Tianjie Xuda44cf12016-09-24 15:31:34 -0700477 return kUncryptFileCloseError;
Yabin Cui25dd0382016-02-01 11:40:37 -0800478 }
Doug Zongker76adfc52014-01-13 10:04:25 -0800479 return 0;
480}
481
Tao Bao3a2bb592016-02-25 12:38:53 -0800482static int uncrypt(const char* input_path, const char* map_file, const int socket) {
Tianjie Xu74778142016-08-05 18:00:04 -0700483 LOG(INFO) << "update package is \"" << input_path << "\"";
Doug Zongkerf449db22014-08-26 09:15:08 -0700484
Tianjie Xu8b8e23d2017-07-27 11:42:17 -0700485 // Turn the name of the file we're supposed to convert into an absolute path, so we can find
486 // what filesystem it's on.
Doug Zongker76adfc52014-01-13 10:04:25 -0800487 char path[PATH_MAX+1];
Tianjie Xu8b8e23d2017-07-27 11:42:17 -0700488 if (realpath(input_path, path) == nullptr) {
Tianjie Xu74778142016-08-05 18:00:04 -0700489 PLOG(ERROR) << "failed to convert \"" << input_path << "\" to absolute path";
Tianjie Xu8b8e23d2017-07-27 11:42:17 -0700490 return kUncryptRealpathFindError;
Doug Zongker76adfc52014-01-13 10:04:25 -0800491 }
492
Tao Bao381f4552015-05-05 18:36:45 -0700493 bool encryptable;
494 bool encrypted;
Jaegeuk Kimb6e6ee72017-12-08 13:19:23 -0800495 bool f2fs_fs;
496 const char* blk_dev = find_block_device(path, &encryptable, &encrypted, &f2fs_fs);
Tianjie Xu8b8e23d2017-07-27 11:42:17 -0700497 if (blk_dev == nullptr) {
Tianjie Xu74778142016-08-05 18:00:04 -0700498 LOG(ERROR) << "failed to find block device for " << path;
Tianjie Xu8b8e23d2017-07-27 11:42:17 -0700499 return kUncryptBlockDeviceFindError;
Doug Zongker76adfc52014-01-13 10:04:25 -0800500 }
501
502 // If the filesystem it's on isn't encrypted, we only produce the
503 // block map, we don't rewrite the file contents (it would be
504 // pointless to do so).
Tianjie Xu74778142016-08-05 18:00:04 -0700505 LOG(INFO) << "encryptable: " << (encryptable ? "yes" : "no");
506 LOG(INFO) << " encrypted: " << (encrypted ? "yes" : "no");
Doug Zongker76adfc52014-01-13 10:04:25 -0800507
Doug Zongker574443d2014-09-05 08:22:12 -0700508 // Recovery supports installing packages from 3 paths: /cache,
509 // /data, and /sdcard. (On a particular device, other locations
510 // may work, but those are three we actually expect.)
511 //
512 // On /data we want to convert the file to a block map so that we
513 // can read the package without mounting the partition. On /cache
514 // and /sdcard we leave the file alone.
Tao Bao383b00d2015-05-21 16:44:44 -0700515 if (strncmp(path, "/data/", 6) == 0) {
Tianjie Xu74778142016-08-05 18:00:04 -0700516 LOG(INFO) << "writing block map " << map_file;
Jaegeuk Kimb6e6ee72017-12-08 13:19:23 -0800517 return produce_block_map(path, map_file, blk_dev, encrypted, f2fs_fs, socket);
Tao Bao383b00d2015-05-21 16:44:44 -0700518 }
519
520 return 0;
521}
522
Tianjie Xu68fc81e2016-09-24 15:31:34 -0700523static void log_uncrypt_error_code(UncryptErrorCode error_code) {
Tianjie Xuda44cf12016-09-24 15:31:34 -0700524 if (!android::base::WriteStringToFile(android::base::StringPrintf(
Tianjie Xu68fc81e2016-09-24 15:31:34 -0700525 "uncrypt_error: %d\n", error_code), UNCRYPT_STATUS)) {
Tianjie Xuda44cf12016-09-24 15:31:34 -0700526 PLOG(WARNING) << "failed to write to " << UNCRYPT_STATUS;
527 }
Tianjie Xu68fc81e2016-09-24 15:31:34 -0700528}
529
530static bool uncrypt_wrapper(const char* input_path, const char* map_file, const int socket) {
531 // Initialize the uncrypt error to kUncryptErrorPlaceholder.
532 log_uncrypt_error_code(kUncryptErrorPlaceholder);
Tianjie Xuda44cf12016-09-24 15:31:34 -0700533
Yabin Cui2d46da52016-01-26 16:50:15 -0800534 std::string package;
535 if (input_path == nullptr) {
536 if (!find_uncrypt_package(UNCRYPT_PATH_FILE, &package)) {
Tao Bao3a2bb592016-02-25 12:38:53 -0800537 write_status_to_socket(-1, socket);
Tianjie Xuda44cf12016-09-24 15:31:34 -0700538 // Overwrite the error message.
Tianjie Xu68fc81e2016-09-24 15:31:34 -0700539 log_uncrypt_error_code(kUncryptPackageMissingError);
Tao Bao3a2bb592016-02-25 12:38:53 -0800540 return false;
Yabin Cui2d46da52016-01-26 16:50:15 -0800541 }
542 input_path = package.c_str();
543 }
544 CHECK(map_file != nullptr);
Tianjie Xue16e7992016-09-09 10:55:44 -0700545
Tianjie Xue16e7992016-09-09 10:55:44 -0700546 auto start = std::chrono::system_clock::now();
Tao Bao3a2bb592016-02-25 12:38:53 -0800547 int status = uncrypt(input_path, map_file, socket);
Tianjie Xuda44cf12016-09-24 15:31:34 -0700548 std::chrono::duration<double> duration = std::chrono::system_clock::now() - start;
549 int count = static_cast<int>(duration.count());
550
551 std::string uncrypt_message = android::base::StringPrintf("uncrypt_time: %d\n", count);
Yabin Cui2d46da52016-01-26 16:50:15 -0800552 if (status != 0) {
Tianjie Xuda44cf12016-09-24 15:31:34 -0700553 // Log the time cost and error code if uncrypt fails.
554 uncrypt_message += android::base::StringPrintf("uncrypt_error: %d\n", status);
555 if (!android::base::WriteStringToFile(uncrypt_message, UNCRYPT_STATUS)) {
556 PLOG(WARNING) << "failed to write to " << UNCRYPT_STATUS;
557 }
558
Tao Bao3a2bb592016-02-25 12:38:53 -0800559 write_status_to_socket(-1, socket);
560 return false;
Yabin Cui2d46da52016-01-26 16:50:15 -0800561 }
Tianjie Xue16e7992016-09-09 10:55:44 -0700562
Tianjie Xuda44cf12016-09-24 15:31:34 -0700563 if (!android::base::WriteStringToFile(uncrypt_message, UNCRYPT_STATUS)) {
Tianjie Xue16e7992016-09-09 10:55:44 -0700564 PLOG(WARNING) << "failed to write to " << UNCRYPT_STATUS;
565 }
566
Tao Bao3a2bb592016-02-25 12:38:53 -0800567 write_status_to_socket(100, socket);
Tianjie Xue16e7992016-09-09 10:55:44 -0700568
Tao Bao3a2bb592016-02-25 12:38:53 -0800569 return true;
Yabin Cui2d46da52016-01-26 16:50:15 -0800570}
571
Tao Bao3a2bb592016-02-25 12:38:53 -0800572static bool clear_bcb(const int socket) {
Yabin Cuia58a6db2016-04-06 15:52:18 -0700573 std::string err;
574 if (!clear_bootloader_message(&err)) {
Tianjie Xu74778142016-08-05 18:00:04 -0700575 LOG(ERROR) << "failed to clear bootloader message: " << err;
Tao Bao3a2bb592016-02-25 12:38:53 -0800576 write_status_to_socket(-1, socket);
577 return false;
Yabin Cui2d46da52016-01-26 16:50:15 -0800578 }
Tao Bao3a2bb592016-02-25 12:38:53 -0800579 write_status_to_socket(100, socket);
580 return true;
Yabin Cui2d46da52016-01-26 16:50:15 -0800581}
582
Tao Bao3a2bb592016-02-25 12:38:53 -0800583static bool setup_bcb(const int socket) {
584 // c5. receive message length
585 int length;
586 if (!android::base::ReadFully(socket, &length, 4)) {
Tianjie Xu74778142016-08-05 18:00:04 -0700587 PLOG(ERROR) << "failed to read the length";
Tao Bao3a2bb592016-02-25 12:38:53 -0800588 return false;
Yabin Cui2d46da52016-01-26 16:50:15 -0800589 }
Tao Bao3a2bb592016-02-25 12:38:53 -0800590 length = ntohl(length);
591
592 // c7. receive message
Yabin Cui2d46da52016-01-26 16:50:15 -0800593 std::string content;
Tao Bao3a2bb592016-02-25 12:38:53 -0800594 content.resize(length);
595 if (!android::base::ReadFully(socket, &content[0], length)) {
Tao Bao10334082016-12-12 17:10:20 -0800596 PLOG(ERROR) << "failed to read the message";
Tao Bao3a2bb592016-02-25 12:38:53 -0800597 return false;
Yabin Cui2d46da52016-01-26 16:50:15 -0800598 }
Tianjie Xu74778142016-08-05 18:00:04 -0700599 LOG(INFO) << " received command: [" << content << "] (" << content.size() << ")";
Yabin Cui6faf0262016-06-09 14:09:39 -0700600 std::vector<std::string> options = android::base::Split(content, "\n");
601 std::string wipe_package;
602 for (auto& option : options) {
603 if (android::base::StartsWith(option, "--wipe_package=")) {
604 std::string path = option.substr(strlen("--wipe_package="));
605 if (!android::base::ReadFileToString(path, &wipe_package)) {
Tianjie Xu74778142016-08-05 18:00:04 -0700606 PLOG(ERROR) << "failed to read " << path;
Yabin Cui6faf0262016-06-09 14:09:39 -0700607 return false;
608 }
609 option = android::base::StringPrintf("--wipe_package_size=%zu", wipe_package.size());
610 }
611 }
Tao Bao3a2bb592016-02-25 12:38:53 -0800612
613 // c8. setup the bcb command
Yabin Cuia58a6db2016-04-06 15:52:18 -0700614 std::string err;
Yabin Cui6faf0262016-06-09 14:09:39 -0700615 if (!write_bootloader_message(options, &err)) {
Tianjie Xu74778142016-08-05 18:00:04 -0700616 LOG(ERROR) << "failed to set bootloader message: " << err;
Tao Bao3a2bb592016-02-25 12:38:53 -0800617 write_status_to_socket(-1, socket);
618 return false;
Yabin Cui2d46da52016-01-26 16:50:15 -0800619 }
Yabin Cui6faf0262016-06-09 14:09:39 -0700620 if (!wipe_package.empty() && !write_wipe_package(wipe_package, &err)) {
Tianjie Xu74778142016-08-05 18:00:04 -0700621 PLOG(ERROR) << "failed to set wipe package: " << err;
Yabin Cui6faf0262016-06-09 14:09:39 -0700622 write_status_to_socket(-1, socket);
623 return false;
624 }
Tao Bao3a2bb592016-02-25 12:38:53 -0800625 // c10. send "100" status
626 write_status_to_socket(100, socket);
627 return true;
Yabin Cui2d46da52016-01-26 16:50:15 -0800628}
629
Yabin Cui2d46da52016-01-26 16:50:15 -0800630static void usage(const char* exename) {
631 fprintf(stderr, "Usage of %s:\n", exename);
632 fprintf(stderr, "%s [<package_path> <map_file>] Uncrypt ota package.\n", exename);
Yabin Cui2d46da52016-01-26 16:50:15 -0800633 fprintf(stderr, "%s --clear-bcb Clear BCB data in misc partition.\n", exename);
634 fprintf(stderr, "%s --setup-bcb Setup BCB data by command file.\n", exename);
Yabin Cui2d46da52016-01-26 16:50:15 -0800635}
636
637int main(int argc, char** argv) {
Tianjie Xu28c1e5d2016-06-30 15:31:51 -0700638 enum { UNCRYPT, SETUP_BCB, CLEAR_BCB, UNCRYPT_DEBUG } action;
Tao Bao3a2bb592016-02-25 12:38:53 -0800639 const char* input_path = nullptr;
640 const char* map_file = CACHE_BLOCK_MAP.c_str();
641
642 if (argc == 2 && strcmp(argv[1], "--clear-bcb") == 0) {
643 action = CLEAR_BCB;
644 } else if (argc == 2 && strcmp(argv[1], "--setup-bcb") == 0) {
645 action = SETUP_BCB;
Tao Bao3a2bb592016-02-25 12:38:53 -0800646 } else if (argc == 1) {
647 action = UNCRYPT;
648 } else if (argc == 3) {
649 input_path = argv[1];
650 map_file = argv[2];
Tianjie Xu28c1e5d2016-06-30 15:31:51 -0700651 action = UNCRYPT_DEBUG;
Tao Bao3a2bb592016-02-25 12:38:53 -0800652 } else {
653 usage(argv[0]);
654 return 2;
Doug Zongker76adfc52014-01-13 10:04:25 -0800655 }
Tao Bao3a2bb592016-02-25 12:38:53 -0800656
657 if ((fstab = read_fstab()) == nullptr) {
Tianjie Xu68fc81e2016-09-24 15:31:34 -0700658 log_uncrypt_error_code(kUncryptFstabReadError);
Tao Bao3a2bb592016-02-25 12:38:53 -0800659 return 1;
660 }
661
Tianjie Xu28c1e5d2016-06-30 15:31:51 -0700662 if (action == UNCRYPT_DEBUG) {
Tianjie Xu74778142016-08-05 18:00:04 -0700663 LOG(INFO) << "uncrypt called in debug mode, skip socket communication";
Tianjie Xu28c1e5d2016-06-30 15:31:51 -0700664 bool success = uncrypt_wrapper(input_path, map_file, -1);
665 if (success) {
Tianjie Xu74778142016-08-05 18:00:04 -0700666 LOG(INFO) << "uncrypt succeeded";
Tianjie Xu28c1e5d2016-06-30 15:31:51 -0700667 } else{
Tianjie Xu74778142016-08-05 18:00:04 -0700668 LOG(INFO) << "uncrypt failed";
Tianjie Xu28c1e5d2016-06-30 15:31:51 -0700669 }
670 return success ? 0 : 1;
671 }
672
Tao Bao3a2bb592016-02-25 12:38:53 -0800673 // c3. The socket is created by init when starting the service. uncrypt
674 // will use the socket to communicate with its caller.
Elliott Hughesd6ac6862016-03-29 12:44:09 -0700675 android::base::unique_fd service_socket(android_get_control_socket(UNCRYPT_SOCKET.c_str()));
676 if (service_socket == -1) {
Tianjie Xu74778142016-08-05 18:00:04 -0700677 PLOG(ERROR) << "failed to open socket \"" << UNCRYPT_SOCKET << "\"";
Tianjie Xu68fc81e2016-09-24 15:31:34 -0700678 log_uncrypt_error_code(kUncryptSocketOpenError);
Tao Bao3a2bb592016-02-25 12:38:53 -0800679 return 1;
680 }
Elliott Hughesd6ac6862016-03-29 12:44:09 -0700681 fcntl(service_socket, F_SETFD, FD_CLOEXEC);
Tao Bao3a2bb592016-02-25 12:38:53 -0800682
Elliott Hughesd6ac6862016-03-29 12:44:09 -0700683 if (listen(service_socket, 1) == -1) {
Tianjie Xu74778142016-08-05 18:00:04 -0700684 PLOG(ERROR) << "failed to listen on socket " << service_socket.get();
Tianjie Xu68fc81e2016-09-24 15:31:34 -0700685 log_uncrypt_error_code(kUncryptSocketListenError);
Tao Bao3a2bb592016-02-25 12:38:53 -0800686 return 1;
687 }
688
Elliott Hughesd6ac6862016-03-29 12:44:09 -0700689 android::base::unique_fd socket_fd(accept4(service_socket, nullptr, nullptr, SOCK_CLOEXEC));
690 if (socket_fd == -1) {
Tianjie Xu74778142016-08-05 18:00:04 -0700691 PLOG(ERROR) << "failed to accept on socket " << service_socket.get();
Tianjie Xu68fc81e2016-09-24 15:31:34 -0700692 log_uncrypt_error_code(kUncryptSocketAcceptError);
Tao Bao3a2bb592016-02-25 12:38:53 -0800693 return 1;
694 }
695
696 bool success = false;
697 switch (action) {
698 case UNCRYPT:
Elliott Hughesd6ac6862016-03-29 12:44:09 -0700699 success = uncrypt_wrapper(input_path, map_file, socket_fd);
Tao Bao3a2bb592016-02-25 12:38:53 -0800700 break;
701 case SETUP_BCB:
Elliott Hughesd6ac6862016-03-29 12:44:09 -0700702 success = setup_bcb(socket_fd);
Tao Bao3a2bb592016-02-25 12:38:53 -0800703 break;
704 case CLEAR_BCB:
Elliott Hughesd6ac6862016-03-29 12:44:09 -0700705 success = clear_bcb(socket_fd);
Tao Bao3a2bb592016-02-25 12:38:53 -0800706 break;
707 default: // Should never happen.
Tianjie Xu74778142016-08-05 18:00:04 -0700708 LOG(ERROR) << "Invalid uncrypt action code: " << action;
Tao Bao3a2bb592016-02-25 12:38:53 -0800709 return 1;
710 }
711
712 // c13. Read a 4-byte code from the client before uncrypt exits. This is to
713 // ensure the client to receive the last status code before the socket gets
714 // destroyed.
715 int code;
Elliott Hughesd6ac6862016-03-29 12:44:09 -0700716 if (android::base::ReadFully(socket_fd, &code, 4)) {
Tianjie Xu74778142016-08-05 18:00:04 -0700717 LOG(INFO) << " received " << code << ", exiting now";
Tao Bao3a2bb592016-02-25 12:38:53 -0800718 } else {
Tianjie Xu74778142016-08-05 18:00:04 -0700719 PLOG(ERROR) << "failed to read the code";
Tao Bao3a2bb592016-02-25 12:38:53 -0800720 }
721 return success ? 0 : 1;
Doug Zongker76adfc52014-01-13 10:04:25 -0800722}