blob: 96edfd78139816d19198ede25d3eb75b4ea4d2d6 [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>
Yabin Cui25dd0382016-02-01 11:40:37 -0800110#include <android-base/stringprintf.h>
Elliott Hughes4b166f02015-12-04 15:30:20 -0800111#include <android-base/strings.h>
Elliott Hughesbcabd092016-03-22 20:19:22 -0700112#include <android-base/unique_fd.h>
Yabin Cuia58a6db2016-04-06 15:52:18 -0700113#include <bootloader_message_writer.h>
Tao Bao75238632015-05-27 14:46:17 -0700114#include <cutils/android_reboot.h>
Doug Zongker76adfc52014-01-13 10:04:25 -0800115#include <cutils/properties.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
119#define WINDOW_SIZE 5
Tao Bao383b00d2015-05-21 16:44:44 -0700120
Tao Bao3a2bb592016-02-25 12:38:53 -0800121// uncrypt provides three services: SETUP_BCB, CLEAR_BCB and UNCRYPT.
122//
123// SETUP_BCB and CLEAR_BCB services use socket communication and do not rely
124// on /cache partitions. They will handle requests to reboot into recovery
125// (for applying updates for non-A/B devices, or factory resets for all
126// devices).
127//
128// UNCRYPT service still needs files on /cache partition (UNCRYPT_PATH_FILE
129// and CACHE_BLOCK_MAP). It will be working (and needed) only for non-A/B
130// devices, on which /cache partitions always exist.
Yabin Cui2d46da52016-01-26 16:50:15 -0800131static const std::string CACHE_BLOCK_MAP = "/cache/recovery/block.map";
Yabin Cui2d46da52016-01-26 16:50:15 -0800132static const std::string UNCRYPT_PATH_FILE = "/cache/recovery/uncrypt_file";
Tianjie Xufe16b5c2016-09-09 10:55:44 -0700133static const std::string UNCRYPT_STATUS = "/cache/recovery/uncrypt_status";
Tao Bao3a2bb592016-02-25 12:38:53 -0800134static const std::string UNCRYPT_SOCKET = "uncrypt";
Doug Zongker76adfc52014-01-13 10:04:25 -0800135
Tao Bao3a2bb592016-02-25 12:38:53 -0800136static struct fstab* fstab = nullptr;
Doug Zongker2efc9d92014-08-18 15:55:28 -0700137
Tao Bao381f4552015-05-05 18:36:45 -0700138static int write_at_offset(unsigned char* buffer, size_t size, int wfd, off64_t offset) {
Elliott Hughes7bad7c42015-04-28 17:24:24 -0700139 if (TEMP_FAILURE_RETRY(lseek64(wfd, offset, SEEK_SET)) == -1) {
Tianjie Xu7b0ad9c2016-08-05 18:00:04 -0700140 PLOG(ERROR) << "error seeking to offset " << offset;
Elliott Hughes7bad7c42015-04-28 17:24:24 -0700141 return -1;
142 }
Yabin Cui25dd0382016-02-01 11:40:37 -0800143 if (!android::base::WriteFully(wfd, buffer, size)) {
Tianjie Xu7b0ad9c2016-08-05 18:00:04 -0700144 PLOG(ERROR) << "error writing offset " << offset;
Yabin Cui25dd0382016-02-01 11:40:37 -0800145 return -1;
Doug Zongker76adfc52014-01-13 10:04:25 -0800146 }
147 return 0;
148}
149
Yabin Cui25dd0382016-02-01 11:40:37 -0800150static void add_block_to_ranges(std::vector<int>& ranges, int new_block) {
151 if (!ranges.empty() && new_block == ranges.back()) {
Doug Zongker76adfc52014-01-13 10:04:25 -0800152 // If the new block comes immediately after the current range,
153 // all we have to do is extend the current range.
Yabin Cui25dd0382016-02-01 11:40:37 -0800154 ++ranges.back();
Doug Zongker76adfc52014-01-13 10:04:25 -0800155 } else {
156 // We need to start a new range.
Yabin Cui25dd0382016-02-01 11:40:37 -0800157 ranges.push_back(new_block);
158 ranges.push_back(new_block + 1);
Doug Zongker76adfc52014-01-13 10:04:25 -0800159 }
160}
161
Tao Bao381f4552015-05-05 18:36:45 -0700162static struct fstab* read_fstab() {
Doug Zongker2efc9d92014-08-18 15:55:28 -0700163 fstab = NULL;
164
Doug Zongker76adfc52014-01-13 10:04:25 -0800165 // The fstab path is always "/fstab.${ro.hardware}".
166 char fstab_path[PATH_MAX+1] = "/fstab.";
167 if (!property_get("ro.hardware", fstab_path+strlen(fstab_path), "")) {
Tianjie Xu7b0ad9c2016-08-05 18:00:04 -0700168 LOG(ERROR) << "failed to get ro.hardware";
Doug Zongker76adfc52014-01-13 10:04:25 -0800169 return NULL;
170 }
171
Doug Zongker2efc9d92014-08-18 15:55:28 -0700172 fstab = fs_mgr_read_fstab(fstab_path);
Doug Zongker76adfc52014-01-13 10:04:25 -0800173 if (!fstab) {
Tianjie Xu7b0ad9c2016-08-05 18:00:04 -0700174 LOG(ERROR) << "failed to read " << fstab_path;
Doug Zongker76adfc52014-01-13 10:04:25 -0800175 return NULL;
176 }
177
Doug Zongker2efc9d92014-08-18 15:55:28 -0700178 return fstab;
179}
180
Tao Bao381f4552015-05-05 18:36:45 -0700181static const char* find_block_device(const char* path, bool* encryptable, bool* encrypted) {
Doug Zongker76adfc52014-01-13 10:04:25 -0800182 // Look for a volume whose mount point is the prefix of path and
183 // return its block device. Set encrypted if it's currently
184 // encrypted.
Tao Bao381f4552015-05-05 18:36:45 -0700185 for (int i = 0; i < fstab->num_entries; ++i) {
Doug Zongker76adfc52014-01-13 10:04:25 -0800186 struct fstab_rec* v = &fstab->recs[i];
Tao Bao381f4552015-05-05 18:36:45 -0700187 if (!v->mount_point) {
188 continue;
189 }
Doug Zongker76adfc52014-01-13 10:04:25 -0800190 int len = strlen(v->mount_point);
191 if (strncmp(path, v->mount_point, len) == 0 &&
192 (path[len] == '/' || path[len] == 0)) {
Tao Bao381f4552015-05-05 18:36:45 -0700193 *encrypted = false;
194 *encryptable = false;
Tao Bao7cf50c62015-07-16 20:04:13 -0700195 if (fs_mgr_is_encryptable(v) || fs_mgr_is_file_encrypted(v)) {
Tao Bao381f4552015-05-05 18:36:45 -0700196 *encryptable = true;
Doug Zongker76adfc52014-01-13 10:04:25 -0800197 char buffer[PROPERTY_VALUE_MAX+1];
198 if (property_get("ro.crypto.state", buffer, "") &&
199 strcmp(buffer, "encrypted") == 0) {
Tao Bao381f4552015-05-05 18:36:45 -0700200 *encrypted = true;
Doug Zongker76adfc52014-01-13 10:04:25 -0800201 }
202 }
203 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) {
211 int status_out = htonl(status);
212 return android::base::WriteFully(socket, &status_out, sizeof(int));
213}
214
Tao Bao383b00d2015-05-21 16:44:44 -0700215// Parse uncrypt_file to find the update package name.
Yabin Cui2d46da52016-01-26 16:50:15 -0800216static bool find_uncrypt_package(const std::string& uncrypt_path_file, std::string* package_name) {
217 CHECK(package_name != nullptr);
218 std::string uncrypt_path;
219 if (!android::base::ReadFileToString(uncrypt_path_file, &uncrypt_path)) {
Tianjie Xu7b0ad9c2016-08-05 18:00:04 -0700220 PLOG(ERROR) << "failed to open \"" << uncrypt_path_file << "\"";
Tao Bao383b00d2015-05-21 16:44:44 -0700221 return false;
Maxim Siniavinee7b28882014-02-13 15:48:53 -0800222 }
Doug Zongker76adfc52014-01-13 10:04:25 -0800223
Tao Bao383b00d2015-05-21 16:44:44 -0700224 // Remove the trailing '\n' if present.
Yabin Cui2d46da52016-01-26 16:50:15 -0800225 *package_name = android::base::Trim(uncrypt_path);
Tao Bao383b00d2015-05-21 16:44:44 -0700226 return true;
Doug Zongker76adfc52014-01-13 10:04:25 -0800227}
228
Tao Bao381f4552015-05-05 18:36:45 -0700229static int produce_block_map(const char* path, const char* map_file, const char* blk_dev,
Tao Bao3a2bb592016-02-25 12:38:53 -0800230 bool encrypted, int socket) {
Yabin Cui25dd0382016-02-01 11:40:37 -0800231 std::string err;
232 if (!android::base::RemoveFileIfExists(map_file, &err)) {
Tianjie Xu7b0ad9c2016-08-05 18:00:04 -0700233 LOG(ERROR) << "failed to remove the existing map file " << map_file << ": " << err;
Sungmin Choia72512c2014-12-10 21:57:09 +0900234 return -1;
235 }
Yabin Cui25dd0382016-02-01 11:40:37 -0800236 std::string tmp_map_file = std::string(map_file) + ".tmp";
Elliott Hughesbcabd092016-03-22 20:19:22 -0700237 android::base::unique_fd mapfd(open(tmp_map_file.c_str(),
238 O_WRONLY | O_CREAT, S_IRUSR | S_IWUSR));
239 if (mapfd == -1) {
Tianjie Xu7b0ad9c2016-08-05 18:00:04 -0700240 PLOG(ERROR) << "failed to open " << tmp_map_file;
Yabin Cui25dd0382016-02-01 11:40:37 -0800241 return -1;
242 }
Doug Zongker76adfc52014-01-13 10:04:25 -0800243
Tao Bao3a2bb592016-02-25 12:38:53 -0800244 // Make sure we can write to the socket.
245 if (!write_status_to_socket(0, socket)) {
Tianjie Xu7b0ad9c2016-08-05 18:00:04 -0700246 LOG(ERROR) << "failed to write to socket " << socket;
Tao Bao383b00d2015-05-21 16:44:44 -0700247 return -1;
248 }
249
Tao Bao381f4552015-05-05 18:36:45 -0700250 struct stat sb;
Tao Baoc7547922015-08-06 18:35:05 -0700251 if (stat(path, &sb) != 0) {
Tianjie Xu7b0ad9c2016-08-05 18:00:04 -0700252 LOG(ERROR) << "failed to stat " << path;
Doug Zongker76adfc52014-01-13 10:04:25 -0800253 return -1;
254 }
255
Tianjie Xu7b0ad9c2016-08-05 18:00:04 -0700256 LOG(INFO) << " block size: " << sb.st_blksize << " bytes";
Doug Zongker76adfc52014-01-13 10:04:25 -0800257
258 int blocks = ((sb.st_size-1) / sb.st_blksize) + 1;
Tianjie Xu7b0ad9c2016-08-05 18:00:04 -0700259 LOG(INFO) << " file size: " << sb.st_size << " bytes, " << blocks << " blocks";
Doug Zongker76adfc52014-01-13 10:04:25 -0800260
Yabin Cui25dd0382016-02-01 11:40:37 -0800261 std::vector<int> ranges;
Doug Zongker76adfc52014-01-13 10:04:25 -0800262
Chih-Hung Hsieh54a27472016-04-18 11:30:55 -0700263 std::string s = android::base::StringPrintf("%s\n%" PRId64 " %" PRId64 "\n",
264 blk_dev, static_cast<int64_t>(sb.st_size),
265 static_cast<int64_t>(sb.st_blksize));
Elliott Hughesbcabd092016-03-22 20:19:22 -0700266 if (!android::base::WriteStringToFd(s, mapfd)) {
Tianjie Xu7b0ad9c2016-08-05 18:00:04 -0700267 PLOG(ERROR) << "failed to write " << tmp_map_file;
Yabin Cui25dd0382016-02-01 11:40:37 -0800268 return -1;
269 }
Doug Zongker76adfc52014-01-13 10:04:25 -0800270
Yabin Cui25dd0382016-02-01 11:40:37 -0800271 std::vector<std::vector<unsigned char>> buffers;
Doug Zongker76adfc52014-01-13 10:04:25 -0800272 if (encrypted) {
Yabin Cui25dd0382016-02-01 11:40:37 -0800273 buffers.resize(WINDOW_SIZE, std::vector<unsigned char>(sb.st_blksize));
Doug Zongker76adfc52014-01-13 10:04:25 -0800274 }
275 int head_block = 0;
276 int head = 0, tail = 0;
Doug Zongker76adfc52014-01-13 10:04:25 -0800277
Elliott Hughesbcabd092016-03-22 20:19:22 -0700278 android::base::unique_fd fd(open(path, O_RDONLY));
279 if (fd == -1) {
Tianjie Xu7b0ad9c2016-08-05 18:00:04 -0700280 PLOG(ERROR) << "failed to open " << path << " for reading";
Doug Zongker76adfc52014-01-13 10:04:25 -0800281 return -1;
282 }
Doug Zongker76adfc52014-01-13 10:04:25 -0800283
Elliott Hughesbcabd092016-03-22 20:19:22 -0700284 android::base::unique_fd wfd;
Doug Zongker76adfc52014-01-13 10:04:25 -0800285 if (encrypted) {
Elliott Hughesbcabd092016-03-22 20:19:22 -0700286 wfd.reset(open(blk_dev, O_WRONLY));
287 if (wfd == -1) {
Tianjie Xu7b0ad9c2016-08-05 18:00:04 -0700288 PLOG(ERROR) << "failed to open " << blk_dev << " for writing";
Doug Zongker76adfc52014-01-13 10:04:25 -0800289 return -1;
290 }
291 }
292
Tao Baob8df5fb2015-12-08 22:47:25 -0800293 off64_t pos = 0;
Tao Bao383b00d2015-05-21 16:44:44 -0700294 int last_progress = 0;
Doug Zongker76adfc52014-01-13 10:04:25 -0800295 while (pos < sb.st_size) {
Tao Bao383b00d2015-05-21 16:44:44 -0700296 // Update the status file, progress must be between [0, 99].
297 int progress = static_cast<int>(100 * (double(pos) / double(sb.st_size)));
298 if (progress > last_progress) {
Tao Bao3a2bb592016-02-25 12:38:53 -0800299 last_progress = progress;
300 write_status_to_socket(progress, socket);
Tao Bao383b00d2015-05-21 16:44:44 -0700301 }
302
Doug Zongker76adfc52014-01-13 10:04:25 -0800303 if ((tail+1) % WINDOW_SIZE == head) {
304 // write out head buffer
305 int block = head_block;
Elliott Hughesbcabd092016-03-22 20:19:22 -0700306 if (ioctl(fd, FIBMAP, &block) != 0) {
Tianjie Xu7b0ad9c2016-08-05 18:00:04 -0700307 LOG(ERROR) << "failed to find block " << head_block;
Doug Zongker76adfc52014-01-13 10:04:25 -0800308 return -1;
309 }
Yabin Cui25dd0382016-02-01 11:40:37 -0800310 add_block_to_ranges(ranges, block);
Doug Zongker76adfc52014-01-13 10:04:25 -0800311 if (encrypted) {
Elliott Hughesbcabd092016-03-22 20:19:22 -0700312 if (write_at_offset(buffers[head].data(), sb.st_blksize, wfd,
313 static_cast<off64_t>(sb.st_blksize) * block) != 0) {
Doug Zongker76adfc52014-01-13 10:04:25 -0800314 return -1;
315 }
316 }
317 head = (head + 1) % WINDOW_SIZE;
318 ++head_block;
319 }
320
321 // read next block to tail
322 if (encrypted) {
Yabin Cui25dd0382016-02-01 11:40:37 -0800323 size_t to_read = static_cast<size_t>(
324 std::min(static_cast<off64_t>(sb.st_blksize), sb.st_size - pos));
Elliott Hughesbcabd092016-03-22 20:19:22 -0700325 if (!android::base::ReadFully(fd, buffers[tail].data(), to_read)) {
Tianjie Xu7b0ad9c2016-08-05 18:00:04 -0700326 PLOG(ERROR) << "failed to read " << path;
Yabin Cui25dd0382016-02-01 11:40:37 -0800327 return -1;
Doug Zongker76adfc52014-01-13 10:04:25 -0800328 }
Yabin Cui25dd0382016-02-01 11:40:37 -0800329 pos += to_read;
Doug Zongker76adfc52014-01-13 10:04:25 -0800330 } else {
331 // If we're not encrypting; we don't need to actually read
332 // anything, just skip pos forward as if we'd read a
333 // block.
334 pos += sb.st_blksize;
335 }
336 tail = (tail+1) % WINDOW_SIZE;
337 }
338
339 while (head != tail) {
340 // write out head buffer
341 int block = head_block;
Elliott Hughesbcabd092016-03-22 20:19:22 -0700342 if (ioctl(fd, FIBMAP, &block) != 0) {
Tianjie Xu7b0ad9c2016-08-05 18:00:04 -0700343 LOG(ERROR) << "failed to find block " << head_block;
Doug Zongker76adfc52014-01-13 10:04:25 -0800344 return -1;
345 }
Yabin Cui25dd0382016-02-01 11:40:37 -0800346 add_block_to_ranges(ranges, block);
Doug Zongker76adfc52014-01-13 10:04:25 -0800347 if (encrypted) {
Elliott Hughesbcabd092016-03-22 20:19:22 -0700348 if (write_at_offset(buffers[head].data(), sb.st_blksize, wfd,
349 static_cast<off64_t>(sb.st_blksize) * block) != 0) {
Doug Zongker76adfc52014-01-13 10:04:25 -0800350 return -1;
351 }
352 }
353 head = (head + 1) % WINDOW_SIZE;
354 ++head_block;
355 }
356
Yabin Cui25dd0382016-02-01 11:40:37 -0800357 if (!android::base::WriteStringToFd(
Elliott Hughesbcabd092016-03-22 20:19:22 -0700358 android::base::StringPrintf("%zu\n", ranges.size() / 2), mapfd)) {
Tianjie Xu7b0ad9c2016-08-05 18:00:04 -0700359 PLOG(ERROR) << "failed to write " << tmp_map_file;
Tao Baofb4ccef2015-05-04 10:10:13 -0700360 return -1;
361 }
Yabin Cui25dd0382016-02-01 11:40:37 -0800362 for (size_t i = 0; i < ranges.size(); i += 2) {
363 if (!android::base::WriteStringToFd(
Elliott Hughesbcabd092016-03-22 20:19:22 -0700364 android::base::StringPrintf("%d %d\n", ranges[i], ranges[i+1]), mapfd)) {
Tianjie Xu7b0ad9c2016-08-05 18:00:04 -0700365 PLOG(ERROR) << "failed to write " << tmp_map_file;
Tao Baofb4ccef2015-05-04 10:10:13 -0700366 return -1;
367 }
Doug Zongker76adfc52014-01-13 10:04:25 -0800368 }
369
Elliott Hughesbcabd092016-03-22 20:19:22 -0700370 if (fsync(mapfd) == -1) {
Tianjie Xu7b0ad9c2016-08-05 18:00:04 -0700371 PLOG(ERROR) << "failed to fsync \"" << tmp_map_file << "\"";
Yabin Cui25dd0382016-02-01 11:40:37 -0800372 return -1;
373 }
Elliott Hughesbcabd092016-03-22 20:19:22 -0700374 if (close(mapfd.release()) == -1) {
Tianjie Xu7b0ad9c2016-08-05 18:00:04 -0700375 PLOG(ERROR) << "failed to close " << tmp_map_file;
Yabin Cui25dd0382016-02-01 11:40:37 -0800376 return -1;
377 }
Yabin Cui25dd0382016-02-01 11:40:37 -0800378
379 if (encrypted) {
Elliott Hughesbcabd092016-03-22 20:19:22 -0700380 if (fsync(wfd) == -1) {
Tianjie Xu7b0ad9c2016-08-05 18:00:04 -0700381 PLOG(ERROR) << "failed to fsync \"" << blk_dev << "\"";
Yabin Cui25dd0382016-02-01 11:40:37 -0800382 return -1;
383 }
Elliott Hughesbcabd092016-03-22 20:19:22 -0700384 if (close(wfd.release()) == -1) {
Tianjie Xu7b0ad9c2016-08-05 18:00:04 -0700385 PLOG(ERROR) << "failed to close " << blk_dev;
Yabin Cui25dd0382016-02-01 11:40:37 -0800386 return -1;
387 }
Yabin Cui25dd0382016-02-01 11:40:37 -0800388 }
389
390 if (rename(tmp_map_file.c_str(), map_file) == -1) {
Tianjie Xu7b0ad9c2016-08-05 18:00:04 -0700391 PLOG(ERROR) << "failed to rename " << tmp_map_file << " to " << map_file;
Yabin Cui25dd0382016-02-01 11:40:37 -0800392 return -1;
393 }
394 // Sync dir to make rename() result written to disk.
395 std::string file_name = map_file;
396 std::string dir_name = dirname(&file_name[0]);
Elliott Hughesbcabd092016-03-22 20:19:22 -0700397 android::base::unique_fd dfd(open(dir_name.c_str(), O_RDONLY | O_DIRECTORY));
398 if (dfd == -1) {
Tianjie Xu7b0ad9c2016-08-05 18:00:04 -0700399 PLOG(ERROR) << "failed to open dir " << dir_name;
Yabin Cui25dd0382016-02-01 11:40:37 -0800400 return -1;
401 }
Elliott Hughesbcabd092016-03-22 20:19:22 -0700402 if (fsync(dfd) == -1) {
Tianjie Xu7b0ad9c2016-08-05 18:00:04 -0700403 PLOG(ERROR) << "failed to fsync " << dir_name;
Yabin Cui25dd0382016-02-01 11:40:37 -0800404 return -1;
405 }
Elliott Hughesbcabd092016-03-22 20:19:22 -0700406 if (close(dfd.release()) == -1) {
Tianjie Xu7b0ad9c2016-08-05 18:00:04 -0700407 PLOG(ERROR) << "failed to close " << dir_name;
Yabin Cui25dd0382016-02-01 11:40:37 -0800408 return -1;
409 }
Doug Zongker76adfc52014-01-13 10:04:25 -0800410 return 0;
411}
412
Tao Bao3a2bb592016-02-25 12:38:53 -0800413static int uncrypt(const char* input_path, const char* map_file, const int socket) {
Tianjie Xu7b0ad9c2016-08-05 18:00:04 -0700414 LOG(INFO) << "update package is \"" << input_path << "\"";
Doug Zongkerf449db22014-08-26 09:15:08 -0700415
Doug Zongker76adfc52014-01-13 10:04:25 -0800416 // Turn the name of the file we're supposed to convert into an
417 // absolute path, so we can find what filesystem it's on.
418 char path[PATH_MAX+1];
419 if (realpath(input_path, path) == NULL) {
Tianjie Xu7b0ad9c2016-08-05 18:00:04 -0700420 PLOG(ERROR) << "failed to convert \"" << input_path << "\" to absolute path";
Doug Zongker76adfc52014-01-13 10:04:25 -0800421 return 1;
422 }
423
Tao Bao381f4552015-05-05 18:36:45 -0700424 bool encryptable;
425 bool encrypted;
Doug Zongker76adfc52014-01-13 10:04:25 -0800426 const char* blk_dev = find_block_device(path, &encryptable, &encrypted);
427 if (blk_dev == NULL) {
Tianjie Xu7b0ad9c2016-08-05 18:00:04 -0700428 LOG(ERROR) << "failed to find block device for " << path;
Doug Zongker76adfc52014-01-13 10:04:25 -0800429 return 1;
430 }
431
432 // If the filesystem it's on isn't encrypted, we only produce the
433 // block map, we don't rewrite the file contents (it would be
434 // pointless to do so).
Tianjie Xu7b0ad9c2016-08-05 18:00:04 -0700435 LOG(INFO) << "encryptable: " << (encryptable ? "yes" : "no");
436 LOG(INFO) << " encrypted: " << (encrypted ? "yes" : "no");
Doug Zongker76adfc52014-01-13 10:04:25 -0800437
Doug Zongker574443d2014-09-05 08:22:12 -0700438 // Recovery supports installing packages from 3 paths: /cache,
439 // /data, and /sdcard. (On a particular device, other locations
440 // may work, but those are three we actually expect.)
441 //
442 // On /data we want to convert the file to a block map so that we
443 // can read the package without mounting the partition. On /cache
444 // and /sdcard we leave the file alone.
Tao Bao383b00d2015-05-21 16:44:44 -0700445 if (strncmp(path, "/data/", 6) == 0) {
Tianjie Xu7b0ad9c2016-08-05 18:00:04 -0700446 LOG(INFO) << "writing block map " << map_file;
Tao Bao3a2bb592016-02-25 12:38:53 -0800447 if (produce_block_map(path, map_file, blk_dev, encrypted, socket) != 0) {
Tao Bao383b00d2015-05-21 16:44:44 -0700448 return 1;
449 }
450 }
451
452 return 0;
453}
454
Tao Bao3a2bb592016-02-25 12:38:53 -0800455static bool uncrypt_wrapper(const char* input_path, const char* map_file, const int socket) {
Yabin Cui2d46da52016-01-26 16:50:15 -0800456 std::string package;
457 if (input_path == nullptr) {
458 if (!find_uncrypt_package(UNCRYPT_PATH_FILE, &package)) {
Tao Bao3a2bb592016-02-25 12:38:53 -0800459 write_status_to_socket(-1, socket);
460 return false;
Yabin Cui2d46da52016-01-26 16:50:15 -0800461 }
462 input_path = package.c_str();
463 }
464 CHECK(map_file != nullptr);
Tianjie Xufe16b5c2016-09-09 10:55:44 -0700465
466#define UNCRYPT_TIME_HOLDER 0x7FFFFFFF
467 // Intialize the uncrypt time cost to a huge number so that we can tell from
468 // the statistics if an uncrypt fails to finish.
469 if (!android::base::WriteStringToFile(android::base::StringPrintf(
470 "uncrypt_time: %d\n", UNCRYPT_TIME_HOLDER), UNCRYPT_STATUS)) {
471 PLOG(WARNING) << "failed to write to " << UNCRYPT_STATUS;
472 }
473
474 auto start = std::chrono::system_clock::now();
Tao Bao3a2bb592016-02-25 12:38:53 -0800475 int status = uncrypt(input_path, map_file, socket);
Yabin Cui2d46da52016-01-26 16:50:15 -0800476 if (status != 0) {
Tao Bao3a2bb592016-02-25 12:38:53 -0800477 write_status_to_socket(-1, socket);
478 return false;
Yabin Cui2d46da52016-01-26 16:50:15 -0800479 }
Tianjie Xufe16b5c2016-09-09 10:55:44 -0700480
481 std::chrono::duration<double> duration = std::chrono::system_clock::now() - start;
482 int count = static_cast<int>(duration.count());
483 // Overwrite the uncrypt_time if uncrypt finishes successfully.
484 if (!android::base::WriteStringToFile(
485 android::base::StringPrintf("uncrypt_time: %d\n", count), UNCRYPT_STATUS)) {
486 PLOG(WARNING) << "failed to write to " << UNCRYPT_STATUS;
487 }
488
Tao Bao3a2bb592016-02-25 12:38:53 -0800489 write_status_to_socket(100, socket);
Tianjie Xufe16b5c2016-09-09 10:55:44 -0700490
Tao Bao3a2bb592016-02-25 12:38:53 -0800491 return true;
Yabin Cui2d46da52016-01-26 16:50:15 -0800492}
493
Tao Bao3a2bb592016-02-25 12:38:53 -0800494static bool clear_bcb(const int socket) {
Yabin Cuia58a6db2016-04-06 15:52:18 -0700495 std::string err;
496 if (!clear_bootloader_message(&err)) {
Tianjie Xu7b0ad9c2016-08-05 18:00:04 -0700497 LOG(ERROR) << "failed to clear bootloader message: " << err;
Tao Bao3a2bb592016-02-25 12:38:53 -0800498 write_status_to_socket(-1, socket);
499 return false;
Yabin Cui2d46da52016-01-26 16:50:15 -0800500 }
Tao Bao3a2bb592016-02-25 12:38:53 -0800501 write_status_to_socket(100, socket);
502 return true;
Yabin Cui2d46da52016-01-26 16:50:15 -0800503}
504
Tao Bao3a2bb592016-02-25 12:38:53 -0800505static bool setup_bcb(const int socket) {
506 // c5. receive message length
507 int length;
508 if (!android::base::ReadFully(socket, &length, 4)) {
Tianjie Xu7b0ad9c2016-08-05 18:00:04 -0700509 PLOG(ERROR) << "failed to read the length";
Tao Bao3a2bb592016-02-25 12:38:53 -0800510 return false;
Yabin Cui2d46da52016-01-26 16:50:15 -0800511 }
Tao Bao3a2bb592016-02-25 12:38:53 -0800512 length = ntohl(length);
513
514 // c7. receive message
Yabin Cui2d46da52016-01-26 16:50:15 -0800515 std::string content;
Tao Bao3a2bb592016-02-25 12:38:53 -0800516 content.resize(length);
517 if (!android::base::ReadFully(socket, &content[0], length)) {
Tianjie Xu7b0ad9c2016-08-05 18:00:04 -0700518 PLOG(ERROR) << "failed to read the length";
Tao Bao3a2bb592016-02-25 12:38:53 -0800519 return false;
Yabin Cui2d46da52016-01-26 16:50:15 -0800520 }
Tianjie Xu7b0ad9c2016-08-05 18:00:04 -0700521 LOG(INFO) << " received command: [" << content << "] (" << content.size() << ")";
Tao Bao3a2bb592016-02-25 12:38:53 -0800522
523 // c8. setup the bcb command
Yabin Cuia58a6db2016-04-06 15:52:18 -0700524 std::string err;
525 if (!write_bootloader_message({content}, &err)) {
Tianjie Xu7b0ad9c2016-08-05 18:00:04 -0700526 LOG(ERROR) << "failed to set bootloader message: " << err;
Tao Bao3a2bb592016-02-25 12:38:53 -0800527 write_status_to_socket(-1, socket);
528 return false;
Yabin Cui2d46da52016-01-26 16:50:15 -0800529 }
Tao Bao3a2bb592016-02-25 12:38:53 -0800530 // c10. send "100" status
531 write_status_to_socket(100, socket);
532 return true;
Yabin Cui2d46da52016-01-26 16:50:15 -0800533}
534
Yabin Cui2d46da52016-01-26 16:50:15 -0800535static void usage(const char* exename) {
536 fprintf(stderr, "Usage of %s:\n", exename);
537 fprintf(stderr, "%s [<package_path> <map_file>] Uncrypt ota package.\n", exename);
Yabin Cui2d46da52016-01-26 16:50:15 -0800538 fprintf(stderr, "%s --clear-bcb Clear BCB data in misc partition.\n", exename);
539 fprintf(stderr, "%s --setup-bcb Setup BCB data by command file.\n", exename);
Yabin Cui2d46da52016-01-26 16:50:15 -0800540}
541
542int main(int argc, char** argv) {
Tao Bao3a2bb592016-02-25 12:38:53 -0800543 enum { UNCRYPT, SETUP_BCB, CLEAR_BCB } action;
544 const char* input_path = nullptr;
545 const char* map_file = CACHE_BLOCK_MAP.c_str();
546
547 if (argc == 2 && strcmp(argv[1], "--clear-bcb") == 0) {
548 action = CLEAR_BCB;
549 } else if (argc == 2 && strcmp(argv[1], "--setup-bcb") == 0) {
550 action = SETUP_BCB;
Tao Bao3a2bb592016-02-25 12:38:53 -0800551 } else if (argc == 1) {
552 action = UNCRYPT;
553 } else if (argc == 3) {
554 input_path = argv[1];
555 map_file = argv[2];
556 action = UNCRYPT;
557 } else {
558 usage(argv[0]);
559 return 2;
Doug Zongker76adfc52014-01-13 10:04:25 -0800560 }
Tao Bao3a2bb592016-02-25 12:38:53 -0800561
562 if ((fstab = read_fstab()) == nullptr) {
563 return 1;
564 }
565
566 // c3. The socket is created by init when starting the service. uncrypt
567 // will use the socket to communicate with its caller.
Elliott Hughesd6ac6862016-03-29 12:44:09 -0700568 android::base::unique_fd service_socket(android_get_control_socket(UNCRYPT_SOCKET.c_str()));
569 if (service_socket == -1) {
Tianjie Xu7b0ad9c2016-08-05 18:00:04 -0700570 PLOG(ERROR) << "failed to open socket \"" << UNCRYPT_SOCKET << "\"";
Tao Bao3a2bb592016-02-25 12:38:53 -0800571 return 1;
572 }
Elliott Hughesd6ac6862016-03-29 12:44:09 -0700573 fcntl(service_socket, F_SETFD, FD_CLOEXEC);
Tao Bao3a2bb592016-02-25 12:38:53 -0800574
Elliott Hughesd6ac6862016-03-29 12:44:09 -0700575 if (listen(service_socket, 1) == -1) {
Tianjie Xu7b0ad9c2016-08-05 18:00:04 -0700576 PLOG(ERROR) << "failed to listen on socket " << service_socket.get();
Tao Bao3a2bb592016-02-25 12:38:53 -0800577 return 1;
578 }
579
Elliott Hughesd6ac6862016-03-29 12:44:09 -0700580 android::base::unique_fd socket_fd(accept4(service_socket, nullptr, nullptr, SOCK_CLOEXEC));
581 if (socket_fd == -1) {
Tianjie Xu7b0ad9c2016-08-05 18:00:04 -0700582 PLOG(ERROR) << "failed to accept on socket " << service_socket.get();
Tao Bao3a2bb592016-02-25 12:38:53 -0800583 return 1;
584 }
585
586 bool success = false;
587 switch (action) {
588 case UNCRYPT:
Elliott Hughesd6ac6862016-03-29 12:44:09 -0700589 success = uncrypt_wrapper(input_path, map_file, socket_fd);
Tao Bao3a2bb592016-02-25 12:38:53 -0800590 break;
591 case SETUP_BCB:
Elliott Hughesd6ac6862016-03-29 12:44:09 -0700592 success = setup_bcb(socket_fd);
Tao Bao3a2bb592016-02-25 12:38:53 -0800593 break;
594 case CLEAR_BCB:
Elliott Hughesd6ac6862016-03-29 12:44:09 -0700595 success = clear_bcb(socket_fd);
Tao Bao3a2bb592016-02-25 12:38:53 -0800596 break;
597 default: // Should never happen.
Tianjie Xu7b0ad9c2016-08-05 18:00:04 -0700598 LOG(ERROR) << "Invalid uncrypt action code: " << action;
Tao Bao3a2bb592016-02-25 12:38:53 -0800599 return 1;
600 }
601
602 // c13. Read a 4-byte code from the client before uncrypt exits. This is to
603 // ensure the client to receive the last status code before the socket gets
604 // destroyed.
605 int code;
Elliott Hughesd6ac6862016-03-29 12:44:09 -0700606 if (android::base::ReadFully(socket_fd, &code, 4)) {
Tianjie Xu7b0ad9c2016-08-05 18:00:04 -0700607 LOG(INFO) << " received " << code << ", exiting now";
Tao Bao3a2bb592016-02-25 12:38:53 -0800608 } else {
Tianjie Xu7b0ad9c2016-08-05 18:00:04 -0700609 PLOG(ERROR) << "failed to read the code";
Tao Bao3a2bb592016-02-25 12:38:53 -0800610 }
611 return success ? 0 : 1;
Doug Zongker76adfc52014-01-13 10:04:25 -0800612}