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Doug Zongkerbc7ffed2014-08-15 14:31:52 -07001/*
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#include <ctype.h>
Sami Tolvanen90221202014-12-09 16:39:47 +000018#include <dirent.h>
Tao Bao641fa972018-04-25 18:59:40 -070019#include <errno.h>
Doug Zongkerbc7ffed2014-08-15 14:31:52 -070020#include <fcntl.h>
Tao Bao0bbc7642017-03-29 23:57:47 -070021#include <inttypes.h>
Tao Baoba9a42a2015-06-23 23:23:33 -070022#include <linux/fs.h>
Doug Zongkerbc7ffed2014-08-15 14:31:52 -070023#include <pthread.h>
24#include <stdarg.h>
25#include <stdio.h>
26#include <stdlib.h>
27#include <string.h>
Tao Bao641fa972018-04-25 18:59:40 -070028#include <sys/ioctl.h>
Sami Tolvanen90221202014-12-09 16:39:47 +000029#include <sys/stat.h>
Doug Zongkerbc7ffed2014-08-15 14:31:52 -070030#include <sys/types.h>
31#include <sys/wait.h>
Doug Zongkerbc7ffed2014-08-15 14:31:52 -070032#include <time.h>
33#include <unistd.h>
34
Tao Baoec8272f2017-03-15 17:39:01 -070035#include <functional>
Tianjie Xu284752e2017-12-05 11:04:17 -080036#include <limits>
Tao Baoe6aa3322015-08-05 15:20:27 -070037#include <memory>
38#include <string>
Tianjie Xu8cf5c8f2016-09-08 20:10:11 -070039#include <unordered_map>
Tao Bao0940fe12015-08-27 16:41:21 -070040#include <vector>
Tao Baoe6aa3322015-08-05 15:20:27 -070041
Tianjie Xu284752e2017-12-05 11:04:17 -080042#include <android-base/file.h>
Tao Bao039f2da2016-11-22 16:29:50 -080043#include <android-base/logging.h>
Elliott Hughes4b166f02015-12-04 15:30:20 -080044#include <android-base/parseint.h>
45#include <android-base/strings.h>
Elliott Hughesbcabd092016-03-22 20:19:22 -070046#include <android-base/unique_fd.h>
Tao Bao51412212016-12-28 14:44:05 -080047#include <applypatch/applypatch.h>
Tianjie Xu107a34f2017-06-29 17:04:21 -070048#include <brotli/decode.h>
Tao Bao641fa972018-04-25 18:59:40 -070049#include <fec/io.h>
Tao Bao51412212016-12-28 14:44:05 -080050#include <openssl/sha.h>
Tianjie Xua946b9e2017-03-21 16:24:57 -070051#include <private/android_filesystem_config.h>
Tianjie Xu8cf5c8f2016-09-08 20:10:11 -070052#include <ziparchive/zip_archive.h>
Tao Baoe6aa3322015-08-05 15:20:27 -070053
Doug Zongkerbc7ffed2014-08-15 14:31:52 -070054#include "edify/expr.h"
Tao Baod33b2f82017-09-28 21:29:11 -070055#include "otafault/ota_io.h"
Tao Bao1fc5bf32017-10-06 07:43:41 -070056#include "otautil/error_code.h"
Tao Bao641fa972018-04-25 18:59:40 -070057#include "otautil/paths.h"
Tao Bao09e468f2017-09-29 14:39:33 -070058#include "otautil/print_sha1.h"
59#include "otautil/rangeset.h"
Tao Baoc3901232018-05-21 16:05:56 -070060#include "private/commands.h"
Tao Bao8f237572017-03-26 13:36:49 -070061#include "updater/install.h"
Tao Bao0c7839a2016-10-10 15:48:37 -070062#include "updater/updater.h"
Doug Zongkerbc7ffed2014-08-15 14:31:52 -070063
Sami Tolvanene82fa182015-06-10 15:58:12 +000064// Set this to 0 to interpret 'erase' transfers to mean do a
65// BLKDISCARD ioctl (the normal behavior). Set to 1 to interpret
66// erase to mean fill the region with zeroes.
67#define DEBUG_ERASE 0
68
Tao Bao51412212016-12-28 14:44:05 -080069static constexpr size_t BLOCKSIZE = 4096;
Tao Bao51412212016-12-28 14:44:05 -080070static constexpr mode_t STASH_DIRECTORY_MODE = 0700;
71static constexpr mode_t STASH_FILE_MODE = 0600;
Sami Tolvanen90221202014-12-09 16:39:47 +000072
Tianjie Xu16255832016-04-30 11:49:59 -070073static CauseCode failure_type = kNoCause;
Tianjie Xu7ce287d2016-05-31 09:29:49 -070074static bool is_retry = false;
Tianjie Xu8cf5c8f2016-09-08 20:10:11 -070075static std::unordered_map<std::string, RangeSet> stash_map;
Tianjie Xu7eca97e2016-03-22 18:08:12 -070076
Tianjie Xu284752e2017-12-05 11:04:17 -080077static void DeleteLastCommandFile() {
Tao Bao641fa972018-04-25 18:59:40 -070078 const std::string& last_command_file = Paths::Get().last_command_file();
Tianjie Xu284752e2017-12-05 11:04:17 -080079 if (unlink(last_command_file.c_str()) == -1 && errno != ENOENT) {
80 PLOG(ERROR) << "Failed to unlink: " << last_command_file;
81 }
82}
83
84// Parse the last command index of the last update and save the result to |last_command_index|.
85// Return true if we successfully read the index.
Tao Bao26efb0a2018-05-21 14:59:55 -070086static bool ParseLastCommandFile(size_t* last_command_index) {
Tao Bao641fa972018-04-25 18:59:40 -070087 const std::string& last_command_file = Paths::Get().last_command_file();
Tianjie Xu284752e2017-12-05 11:04:17 -080088 android::base::unique_fd fd(TEMP_FAILURE_RETRY(open(last_command_file.c_str(), O_RDONLY)));
89 if (fd == -1) {
90 if (errno != ENOENT) {
91 PLOG(ERROR) << "Failed to open " << last_command_file;
92 return false;
93 }
94
95 LOG(INFO) << last_command_file << " doesn't exist.";
96 return false;
97 }
98
99 // Now that the last_command file exists, parse the last command index of previous update.
100 std::string content;
101 if (!android::base::ReadFdToString(fd.get(), &content)) {
102 LOG(ERROR) << "Failed to read: " << last_command_file;
103 return false;
104 }
105
106 std::vector<std::string> lines = android::base::Split(android::base::Trim(content), "\n");
107 if (lines.size() != 2) {
108 LOG(ERROR) << "Unexpected line counts in last command file: " << content;
109 return false;
110 }
111
112 if (!android::base::ParseInt(lines[0], last_command_index)) {
113 LOG(ERROR) << "Failed to parse integer in: " << lines[0];
114 return false;
115 }
116
117 return true;
118}
119
Tao Bao864c6682018-05-07 11:38:25 -0700120static bool FsyncDir(const std::string& dirname) {
121 android::base::unique_fd dfd(
122 TEMP_FAILURE_RETRY(ota_open(dirname.c_str(), O_RDONLY | O_DIRECTORY)));
123 if (dfd == -1) {
124 failure_type = kFileOpenFailure;
125 PLOG(ERROR) << "Failed to open " << dirname;
126 return false;
127 }
128 if (fsync(dfd) == -1) {
129 failure_type = kFsyncFailure;
130 PLOG(ERROR) << "Failed to fsync " << dirname;
131 return false;
132 }
133 return true;
134}
135
Tianjie Xuc2b2bb52018-05-15 15:09:59 -0700136// Update the last executed command index in the last_command_file.
Tao Bao26efb0a2018-05-21 14:59:55 -0700137static bool UpdateLastCommandIndex(size_t command_index, const std::string& command_string) {
Tao Bao641fa972018-04-25 18:59:40 -0700138 const std::string& last_command_file = Paths::Get().last_command_file();
Tianjie Xu284752e2017-12-05 11:04:17 -0800139 std::string last_command_tmp = last_command_file + ".tmp";
140 std::string content = std::to_string(command_index) + "\n" + command_string;
141 android::base::unique_fd wfd(
142 TEMP_FAILURE_RETRY(open(last_command_tmp.c_str(), O_WRONLY | O_CREAT | O_TRUNC, 0660)));
143 if (wfd == -1 || !android::base::WriteStringToFd(content, wfd)) {
144 PLOG(ERROR) << "Failed to update last command";
145 return false;
146 }
147
148 if (fsync(wfd) == -1) {
149 PLOG(ERROR) << "Failed to fsync " << last_command_tmp;
150 return false;
151 }
152
153 if (chown(last_command_tmp.c_str(), AID_SYSTEM, AID_SYSTEM) == -1) {
154 PLOG(ERROR) << "Failed to change owner for " << last_command_tmp;
155 return false;
156 }
157
158 if (rename(last_command_tmp.c_str(), last_command_file.c_str()) == -1) {
159 PLOG(ERROR) << "Failed to rename" << last_command_tmp;
160 return false;
161 }
162
Tao Bao864c6682018-05-07 11:38:25 -0700163 if (!FsyncDir(android::base::Dirname(last_command_file))) {
Tianjie Xu284752e2017-12-05 11:04:17 -0800164 return false;
165 }
166
Tao Bao864c6682018-05-07 11:38:25 -0700167 return true;
168}
169
170static bool SetPartitionUpdatedMarker(const std::string& marker) {
171 if (!android::base::WriteStringToFile("", marker)) {
172 PLOG(ERROR) << "Failed to write to marker file " << marker;
Tianjie Xu284752e2017-12-05 11:04:17 -0800173 return false;
174 }
Tao Bao864c6682018-05-07 11:38:25 -0700175 if (!FsyncDir(android::base::Dirname(marker))) {
176 return false;
177 }
178 LOG(INFO) << "Wrote partition updated marker to " << marker;
Tianjie Xu284752e2017-12-05 11:04:17 -0800179 return true;
180}
181
Sami Tolvanen90221202014-12-09 16:39:47 +0000182static int read_all(int fd, uint8_t* data, size_t size) {
Doug Zongkerbc7ffed2014-08-15 14:31:52 -0700183 size_t so_far = 0;
184 while (so_far < size) {
Jed Estepa7b9a462015-12-15 16:04:53 -0800185 ssize_t r = TEMP_FAILURE_RETRY(ota_read(fd, data+so_far, size-so_far));
Elliott Hughes7bad7c42015-04-28 17:24:24 -0700186 if (r == -1) {
Tianjie Xu16255832016-04-30 11:49:59 -0700187 failure_type = kFreadFailure;
Tao Bao039f2da2016-11-22 16:29:50 -0800188 PLOG(ERROR) << "read failed";
Sami Tolvanen90221202014-12-09 16:39:47 +0000189 return -1;
Tianjie Xu71e182b2016-08-31 18:06:33 -0700190 } else if (r == 0) {
191 failure_type = kFreadFailure;
Tao Bao039f2da2016-11-22 16:29:50 -0800192 LOG(ERROR) << "read reached unexpected EOF.";
Tianjie Xu71e182b2016-08-31 18:06:33 -0700193 return -1;
Doug Zongkerbc7ffed2014-08-15 14:31:52 -0700194 }
Elliott Hughes7bad7c42015-04-28 17:24:24 -0700195 so_far += r;
Doug Zongkerbc7ffed2014-08-15 14:31:52 -0700196 }
Sami Tolvanen90221202014-12-09 16:39:47 +0000197 return 0;
Doug Zongkerbc7ffed2014-08-15 14:31:52 -0700198}
199
Tao Bao612336d2015-08-27 16:41:21 -0700200static int read_all(int fd, std::vector<uint8_t>& buffer, size_t size) {
201 return read_all(fd, buffer.data(), size);
202}
203
Sami Tolvanen90221202014-12-09 16:39:47 +0000204static int write_all(int fd, const uint8_t* data, size_t size) {
Doug Zongkerbc7ffed2014-08-15 14:31:52 -0700205 size_t written = 0;
206 while (written < size) {
Jed Estepa7b9a462015-12-15 16:04:53 -0800207 ssize_t w = TEMP_FAILURE_RETRY(ota_write(fd, data+written, size-written));
Elliott Hughes7bad7c42015-04-28 17:24:24 -0700208 if (w == -1) {
Tianjie Xu16255832016-04-30 11:49:59 -0700209 failure_type = kFwriteFailure;
Tao Bao039f2da2016-11-22 16:29:50 -0800210 PLOG(ERROR) << "write failed";
Sami Tolvanen90221202014-12-09 16:39:47 +0000211 return -1;
Doug Zongkerbc7ffed2014-08-15 14:31:52 -0700212 }
Elliott Hughes7bad7c42015-04-28 17:24:24 -0700213 written += w;
Doug Zongkerbc7ffed2014-08-15 14:31:52 -0700214 }
Sami Tolvanen90221202014-12-09 16:39:47 +0000215
Sami Tolvanen90221202014-12-09 16:39:47 +0000216 return 0;
Doug Zongkerbc7ffed2014-08-15 14:31:52 -0700217}
218
Tao Bao612336d2015-08-27 16:41:21 -0700219static int write_all(int fd, const std::vector<uint8_t>& buffer, size_t size) {
220 return write_all(fd, buffer.data(), size);
221}
222
Tianjie Xu7ce287d2016-05-31 09:29:49 -0700223static bool discard_blocks(int fd, off64_t offset, uint64_t size) {
Tao Baobf5b77d2017-03-30 16:57:29 -0700224 // Don't discard blocks unless the update is a retry run.
225 if (!is_retry) {
Tianjie Xu7ce287d2016-05-31 09:29:49 -0700226 return true;
Tao Baobf5b77d2017-03-30 16:57:29 -0700227 }
228
229 uint64_t args[2] = { static_cast<uint64_t>(offset), size };
230 if (ioctl(fd, BLKDISCARD, &args) == -1) {
231 PLOG(ERROR) << "BLKDISCARD ioctl failed";
232 return false;
233 }
234 return true;
Tianjie Xu7ce287d2016-05-31 09:29:49 -0700235}
236
Elliott Hughes7bad7c42015-04-28 17:24:24 -0700237static bool check_lseek(int fd, off64_t offset, int whence) {
238 off64_t rc = TEMP_FAILURE_RETRY(lseek64(fd, offset, whence));
239 if (rc == -1) {
Tianjie Xu16255832016-04-30 11:49:59 -0700240 failure_type = kLseekFailure;
Tao Bao039f2da2016-11-22 16:29:50 -0800241 PLOG(ERROR) << "lseek64 failed";
Elliott Hughes7bad7c42015-04-28 17:24:24 -0700242 return false;
Doug Zongkerbc7ffed2014-08-15 14:31:52 -0700243 }
Elliott Hughes7bad7c42015-04-28 17:24:24 -0700244 return true;
Doug Zongkerbc7ffed2014-08-15 14:31:52 -0700245}
246
Tao Bao612336d2015-08-27 16:41:21 -0700247static void allocate(size_t size, std::vector<uint8_t>& buffer) {
Doug Zongkerbc7ffed2014-08-15 14:31:52 -0700248 // if the buffer's big enough, reuse it.
Tao Bao612336d2015-08-27 16:41:21 -0700249 if (size <= buffer.size()) return;
Doug Zongkerbc7ffed2014-08-15 14:31:52 -0700250
Tao Bao612336d2015-08-27 16:41:21 -0700251 buffer.resize(size);
Doug Zongkerbc7ffed2014-08-15 14:31:52 -0700252}
253
Tao Bao60a70af2017-03-26 14:03:52 -0700254/**
255 * RangeSinkWriter reads data from the given FD, and writes them to the destination specified by the
256 * given RangeSet.
257 */
258class RangeSinkWriter {
259 public:
260 RangeSinkWriter(int fd, const RangeSet& tgt)
Tianjie Xu107a34f2017-06-29 17:04:21 -0700261 : fd_(fd),
262 tgt_(tgt),
263 next_range_(0),
264 current_range_left_(0),
265 bytes_written_(0) {
Tao Baobf5b77d2017-03-30 16:57:29 -0700266 CHECK_NE(tgt.size(), static_cast<size_t>(0));
Tao Bao60a70af2017-03-26 14:03:52 -0700267 };
Tao Bao0940fe12015-08-27 16:41:21 -0700268
Tao Bao60a70af2017-03-26 14:03:52 -0700269 bool Finished() const {
Tao Baobf5b77d2017-03-30 16:57:29 -0700270 return next_range_ == tgt_.size() && current_range_left_ == 0;
Tao Baof7eb7602017-03-27 15:12:48 -0700271 }
272
Tianjie Xu6ed175d2017-07-18 11:29:40 -0700273 size_t AvailableSpace() const {
274 return tgt_.blocks() * BLOCKSIZE - bytes_written_;
275 }
276
277 // Return number of bytes written; and 0 indicates a writing failure.
278 size_t Write(const uint8_t* data, size_t size) {
Tao Bao60a70af2017-03-26 14:03:52 -0700279 if (Finished()) {
280 LOG(ERROR) << "range sink write overrun; can't write " << size << " bytes";
281 return 0;
Tao Baof7eb7602017-03-27 15:12:48 -0700282 }
283
Tianjie Xu6ed175d2017-07-18 11:29:40 -0700284 size_t written = 0;
Tao Bao60a70af2017-03-26 14:03:52 -0700285 while (size > 0) {
286 // Move to the next range as needed.
Tianjie Xu107a34f2017-06-29 17:04:21 -0700287 if (!SeekToOutputRange()) {
288 break;
Tao Bao60a70af2017-03-26 14:03:52 -0700289 }
Tao Baof7eb7602017-03-27 15:12:48 -0700290
Tao Bao60a70af2017-03-26 14:03:52 -0700291 size_t write_now = size;
292 if (current_range_left_ < write_now) {
293 write_now = current_range_left_;
294 }
Tao Baof7eb7602017-03-27 15:12:48 -0700295
Tao Bao60a70af2017-03-26 14:03:52 -0700296 if (write_all(fd_, data, write_now) == -1) {
Tao Baof7eb7602017-03-27 15:12:48 -0700297 break;
298 }
Tao Bao60a70af2017-03-26 14:03:52 -0700299
300 data += write_now;
301 size -= write_now;
302
303 current_range_left_ -= write_now;
Tianjie Xu6ed175d2017-07-18 11:29:40 -0700304 written += write_now;
Doug Zongkerbc7ffed2014-08-15 14:31:52 -0700305 }
Tao Bao60a70af2017-03-26 14:03:52 -0700306
Tianjie Xu6ed175d2017-07-18 11:29:40 -0700307 bytes_written_ += written;
308 return written;
Tao Baof7eb7602017-03-27 15:12:48 -0700309 }
Doug Zongkerbc7ffed2014-08-15 14:31:52 -0700310
Tianjie Xu3a8d98d2017-04-03 20:01:17 -0700311 size_t BytesWritten() const {
312 return bytes_written_;
313 }
314
Tianjie Xu6ed175d2017-07-18 11:29:40 -0700315 private:
Tianjie Xu107a34f2017-06-29 17:04:21 -0700316 // Set up the output cursor, move to next range if needed.
317 bool SeekToOutputRange() {
318 // We haven't finished the current range yet.
319 if (current_range_left_ != 0) {
320 return true;
321 }
322 // We can't write any more; let the write function return how many bytes have been written
323 // so far.
324 if (next_range_ >= tgt_.size()) {
325 return false;
326 }
327
328 const Range& range = tgt_[next_range_];
329 off64_t offset = static_cast<off64_t>(range.first) * BLOCKSIZE;
330 current_range_left_ = (range.second - range.first) * BLOCKSIZE;
331 next_range_++;
332
333 if (!discard_blocks(fd_, offset, current_range_left_)) {
334 return false;
335 }
336 if (!check_lseek(fd_, offset, SEEK_SET)) {
337 return false;
338 }
339 return true;
340 }
341
342 // The output file descriptor.
Tao Bao60a70af2017-03-26 14:03:52 -0700343 int fd_;
Tianjie Xu107a34f2017-06-29 17:04:21 -0700344 // The destination ranges for the data.
Tao Bao60a70af2017-03-26 14:03:52 -0700345 const RangeSet& tgt_;
346 // The next range that we should write to.
347 size_t next_range_;
348 // The number of bytes to write before moving to the next range.
349 size_t current_range_left_;
Tianjie Xu3a8d98d2017-04-03 20:01:17 -0700350 // Total bytes written by the writer.
351 size_t bytes_written_;
Tao Bao60a70af2017-03-26 14:03:52 -0700352};
Doug Zongkerbc7ffed2014-08-15 14:31:52 -0700353
Tao Bao60a70af2017-03-26 14:03:52 -0700354/**
355 * All of the data for all the 'new' transfers is contained in one file in the update package,
356 * concatenated together in the order in which transfers.list will need it. We want to stream it out
357 * of the archive (it's compressed) without writing it to a temp file, but we can't write each
358 * section until it's that transfer's turn to go.
359 *
360 * To achieve this, we expand the new data from the archive in a background thread, and block that
361 * threads 'receive uncompressed data' function until the main thread has reached a point where we
362 * want some new data to be written. We signal the background thread with the destination for the
363 * data and block the main thread, waiting for the background thread to complete writing that
364 * section. Then it signals the main thread to wake up and goes back to blocking waiting for a
365 * transfer.
366 *
367 * NewThreadInfo is the struct used to pass information back and forth between the two threads. When
368 * the main thread wants some data written, it sets writer to the destination location and signals
369 * the condition. When the background thread is done writing, it clears writer and signals the
370 * condition again.
371 */
Tao Bao0940fe12015-08-27 16:41:21 -0700372struct NewThreadInfo {
Tao Bao60a70af2017-03-26 14:03:52 -0700373 ZipArchiveHandle za;
374 ZipEntry entry;
Tianjie Xu107a34f2017-06-29 17:04:21 -0700375 bool brotli_compressed;
Doug Zongkerbc7ffed2014-08-15 14:31:52 -0700376
Tianjie Xu107a34f2017-06-29 17:04:21 -0700377 std::unique_ptr<RangeSinkWriter> writer;
378 BrotliDecoderState* brotli_decoder_state;
Tianjie Xu3a8d98d2017-04-03 20:01:17 -0700379 bool receiver_available;
Doug Zongkerbc7ffed2014-08-15 14:31:52 -0700380
Tao Bao60a70af2017-03-26 14:03:52 -0700381 pthread_mutex_t mu;
382 pthread_cond_t cv;
Tao Bao0940fe12015-08-27 16:41:21 -0700383};
Doug Zongkerbc7ffed2014-08-15 14:31:52 -0700384
Tianjie Xu8cf5c8f2016-09-08 20:10:11 -0700385static bool receive_new_data(const uint8_t* data, size_t size, void* cookie) {
Tao Bao60a70af2017-03-26 14:03:52 -0700386 NewThreadInfo* nti = static_cast<NewThreadInfo*>(cookie);
Doug Zongkerbc7ffed2014-08-15 14:31:52 -0700387
Tao Bao60a70af2017-03-26 14:03:52 -0700388 while (size > 0) {
389 // Wait for nti->writer to be non-null, indicating some of this data is wanted.
390 pthread_mutex_lock(&nti->mu);
391 while (nti->writer == nullptr) {
Tianjie Xu5450c842017-10-18 13:15:21 -0700392 // End the new data receiver if we encounter an error when performing block image update.
393 if (!nti->receiver_available) {
394 pthread_mutex_unlock(&nti->mu);
395 return false;
396 }
Tao Bao60a70af2017-03-26 14:03:52 -0700397 pthread_cond_wait(&nti->cv, &nti->mu);
Doug Zongkerbc7ffed2014-08-15 14:31:52 -0700398 }
Tao Bao60a70af2017-03-26 14:03:52 -0700399 pthread_mutex_unlock(&nti->mu);
Doug Zongkerbc7ffed2014-08-15 14:31:52 -0700400
Tao Bao60a70af2017-03-26 14:03:52 -0700401 // At this point nti->writer is set, and we own it. The main thread is waiting for it to
402 // disappear from nti.
Tianjie Xu6ed175d2017-07-18 11:29:40 -0700403 size_t write_now = std::min(size, nti->writer->AvailableSpace());
404 if (nti->writer->Write(data, write_now) != write_now) {
405 LOG(ERROR) << "Failed to write " << write_now << " bytes.";
Tianjie Xu107a34f2017-06-29 17:04:21 -0700406 return false;
407 }
Tianjie Xu6ed175d2017-07-18 11:29:40 -0700408
409 data += write_now;
410 size -= write_now;
411
412 if (nti->writer->Finished()) {
413 // We have written all the bytes desired by this writer.
414
415 pthread_mutex_lock(&nti->mu);
416 nti->writer = nullptr;
417 pthread_cond_broadcast(&nti->cv);
418 pthread_mutex_unlock(&nti->mu);
419 }
420 }
421
422 return true;
423}
424
425static bool receive_brotli_new_data(const uint8_t* data, size_t size, void* cookie) {
426 NewThreadInfo* nti = static_cast<NewThreadInfo*>(cookie);
427
428 while (size > 0 || BrotliDecoderHasMoreOutput(nti->brotli_decoder_state)) {
429 // Wait for nti->writer to be non-null, indicating some of this data is wanted.
430 pthread_mutex_lock(&nti->mu);
431 while (nti->writer == nullptr) {
Tianjie Xu5450c842017-10-18 13:15:21 -0700432 // End the receiver if we encounter an error when performing block image update.
433 if (!nti->receiver_available) {
434 pthread_mutex_unlock(&nti->mu);
435 return false;
436 }
Tianjie Xu6ed175d2017-07-18 11:29:40 -0700437 pthread_cond_wait(&nti->cv, &nti->mu);
438 }
439 pthread_mutex_unlock(&nti->mu);
440
441 // At this point nti->writer is set, and we own it. The main thread is waiting for it to
442 // disappear from nti.
443
444 size_t buffer_size = std::min<size_t>(32768, nti->writer->AvailableSpace());
445 if (buffer_size == 0) {
446 LOG(ERROR) << "No space left in output range";
447 return false;
448 }
449 uint8_t buffer[buffer_size];
450 size_t available_in = size;
451 size_t available_out = buffer_size;
452 uint8_t* next_out = buffer;
453
454 // The brotli decoder will update |data|, |available_in|, |next_out| and |available_out|.
455 BrotliDecoderResult result = BrotliDecoderDecompressStream(
456 nti->brotli_decoder_state, &available_in, &data, &available_out, &next_out, nullptr);
457
458 if (result == BROTLI_DECODER_RESULT_ERROR) {
459 LOG(ERROR) << "Decompression failed with "
460 << BrotliDecoderErrorString(BrotliDecoderGetErrorCode(nti->brotli_decoder_state));
461 return false;
462 }
463
464 LOG(DEBUG) << "bytes to write: " << buffer_size - available_out << ", bytes consumed "
465 << size - available_in << ", decoder status " << result;
466
467 size_t write_now = buffer_size - available_out;
468 if (nti->writer->Write(buffer, write_now) != write_now) {
469 LOG(ERROR) << "Failed to write " << write_now << " bytes.";
470 return false;
471 }
472
473 // Update the remaining size. The input data ptr is already updated by brotli decoder function.
474 size = available_in;
Tao Bao60a70af2017-03-26 14:03:52 -0700475
476 if (nti->writer->Finished()) {
477 // We have written all the bytes desired by this writer.
478
479 pthread_mutex_lock(&nti->mu);
480 nti->writer = nullptr;
481 pthread_cond_broadcast(&nti->cv);
482 pthread_mutex_unlock(&nti->mu);
483 }
484 }
485
486 return true;
Doug Zongkerbc7ffed2014-08-15 14:31:52 -0700487}
488
489static void* unzip_new_data(void* cookie) {
Tianjie Xu3a8d98d2017-04-03 20:01:17 -0700490 NewThreadInfo* nti = static_cast<NewThreadInfo*>(cookie);
Tianjie Xu6ed175d2017-07-18 11:29:40 -0700491 if (nti->brotli_compressed) {
492 ProcessZipEntryContents(nti->za, &nti->entry, receive_brotli_new_data, nti);
493 } else {
494 ProcessZipEntryContents(nti->za, &nti->entry, receive_new_data, nti);
495 }
Tianjie Xu3a8d98d2017-04-03 20:01:17 -0700496 pthread_mutex_lock(&nti->mu);
497 nti->receiver_available = false;
498 if (nti->writer != nullptr) {
499 pthread_cond_broadcast(&nti->cv);
500 }
501 pthread_mutex_unlock(&nti->mu);
502 return nullptr;
Doug Zongkerbc7ffed2014-08-15 14:31:52 -0700503}
504
Tao Bao612336d2015-08-27 16:41:21 -0700505static int ReadBlocks(const RangeSet& src, std::vector<uint8_t>& buffer, int fd) {
Tao Baobf5b77d2017-03-30 16:57:29 -0700506 size_t p = 0;
507 for (const auto& range : src) {
508 if (!check_lseek(fd, static_cast<off64_t>(range.first) * BLOCKSIZE, SEEK_SET)) {
509 return -1;
Sami Tolvanen90221202014-12-09 16:39:47 +0000510 }
511
Tao Baobf5b77d2017-03-30 16:57:29 -0700512 size_t size = (range.second - range.first) * BLOCKSIZE;
513 if (read_all(fd, buffer.data() + p, size) == -1) {
514 return -1;
515 }
516
517 p += size;
518 }
519
520 return 0;
Sami Tolvanen90221202014-12-09 16:39:47 +0000521}
522
Tao Bao612336d2015-08-27 16:41:21 -0700523static int WriteBlocks(const RangeSet& tgt, const std::vector<uint8_t>& buffer, int fd) {
Tao Bao60a70af2017-03-26 14:03:52 -0700524 size_t written = 0;
Tao Baobf5b77d2017-03-30 16:57:29 -0700525 for (const auto& range : tgt) {
526 off64_t offset = static_cast<off64_t>(range.first) * BLOCKSIZE;
527 size_t size = (range.second - range.first) * BLOCKSIZE;
Tao Bao60a70af2017-03-26 14:03:52 -0700528 if (!discard_blocks(fd, offset, size)) {
529 return -1;
Sami Tolvanen90221202014-12-09 16:39:47 +0000530 }
531
Tao Bao60a70af2017-03-26 14:03:52 -0700532 if (!check_lseek(fd, offset, SEEK_SET)) {
533 return -1;
534 }
535
536 if (write_all(fd, buffer.data() + written, size) == -1) {
537 return -1;
538 }
539
540 written += size;
541 }
542
543 return 0;
Sami Tolvanen90221202014-12-09 16:39:47 +0000544}
545
Tao Baobaad2d42015-12-06 16:56:27 -0800546// Parameters for transfer list command functions
547struct CommandParameters {
548 std::vector<std::string> tokens;
549 size_t cpos;
Tao Baoc3901232018-05-21 16:05:56 -0700550 std::string cmdname;
551 std::string cmdline;
Tao Baobaad2d42015-12-06 16:56:27 -0800552 std::string freestash;
553 std::string stashbase;
554 bool canwrite;
555 int createdstash;
Elliott Hughesbcabd092016-03-22 20:19:22 -0700556 android::base::unique_fd fd;
Tao Baobaad2d42015-12-06 16:56:27 -0800557 bool foundwrites;
558 bool isunresumable;
559 int version;
560 size_t written;
Tianjie Xudd874b12016-05-13 12:13:15 -0700561 size_t stashed;
Tao Baobaad2d42015-12-06 16:56:27 -0800562 NewThreadInfo nti;
563 pthread_t thread;
564 std::vector<uint8_t> buffer;
565 uint8_t* patch_start;
Tianjie Xu284752e2017-12-05 11:04:17 -0800566 bool target_verified; // The target blocks have expected contents already.
Tao Baobaad2d42015-12-06 16:56:27 -0800567};
568
Tianjie Xu2cd36ba2017-03-15 23:52:46 +0000569// Print the hash in hex for corrupted source blocks (excluding the stashed blocks which is
570// handled separately).
571static void PrintHashForCorruptedSourceBlocks(const CommandParameters& params,
572 const std::vector<uint8_t>& buffer) {
573 LOG(INFO) << "unexpected contents of source blocks in cmd:\n" << params.cmdline;
Tianjie Xu2cd36ba2017-03-15 23:52:46 +0000574 CHECK(params.tokens[0] == "move" || params.tokens[0] == "bsdiff" ||
575 params.tokens[0] == "imgdiff");
576
577 size_t pos = 0;
578 // Command example:
579 // move <onehash> <tgt_range> <src_blk_count> <src_range> [<loc_range> <stashed_blocks>]
580 // bsdiff <offset> <len> <src_hash> <tgt_hash> <tgt_range> <src_blk_count> <src_range>
581 // [<loc_range> <stashed_blocks>]
582 if (params.tokens[0] == "move") {
583 // src_range for move starts at the 4th position.
584 if (params.tokens.size() < 5) {
585 LOG(ERROR) << "failed to parse source range in cmd:\n" << params.cmdline;
586 return;
587 }
588 pos = 4;
589 } else {
590 // src_range for diff starts at the 7th position.
591 if (params.tokens.size() < 8) {
592 LOG(ERROR) << "failed to parse source range in cmd:\n" << params.cmdline;
593 return;
594 }
595 pos = 7;
596 }
597
598 // Source blocks in stash only, no work to do.
599 if (params.tokens[pos] == "-") {
600 return;
601 }
602
Tao Bao8f237572017-03-26 13:36:49 -0700603 RangeSet src = RangeSet::Parse(params.tokens[pos++]);
Tao Bao67983152017-11-04 00:08:08 -0700604 if (!src) {
605 LOG(ERROR) << "Failed to parse range in " << params.cmdline;
606 return;
607 }
Tianjie Xu2cd36ba2017-03-15 23:52:46 +0000608
609 RangeSet locs;
610 // If there's no stashed blocks, content in the buffer is consecutive and has the same
611 // order as the source blocks.
612 if (pos == params.tokens.size()) {
Tao Baobf5b77d2017-03-30 16:57:29 -0700613 locs = RangeSet(std::vector<Range>{ Range{ 0, src.blocks() } });
Tianjie Xu2cd36ba2017-03-15 23:52:46 +0000614 } else {
615 // Otherwise, the next token is the offset of the source blocks in the target range.
616 // Example: for the tokens <4,63946,63947,63948,63979> <4,6,7,8,39> <stashed_blocks>;
617 // We want to print SHA-1 for the data in buffer[6], buffer[8], buffer[9] ... buffer[38];
618 // this corresponds to the 32 src blocks #63946, #63948, #63949 ... #63978.
Tao Bao8f237572017-03-26 13:36:49 -0700619 locs = RangeSet::Parse(params.tokens[pos++]);
Tao Baobf5b77d2017-03-30 16:57:29 -0700620 CHECK_EQ(src.blocks(), locs.blocks());
Tianjie Xu2cd36ba2017-03-15 23:52:46 +0000621 }
622
Tao Baobf5b77d2017-03-30 16:57:29 -0700623 LOG(INFO) << "printing hash in hex for " << src.blocks() << " source blocks";
624 for (size_t i = 0; i < src.blocks(); i++) {
Tao Bao8f237572017-03-26 13:36:49 -0700625 size_t block_num = src.GetBlockNumber(i);
626 size_t buffer_index = locs.GetBlockNumber(i);
Tianjie Xu2cd36ba2017-03-15 23:52:46 +0000627 CHECK_LE((buffer_index + 1) * BLOCKSIZE, buffer.size());
628
629 uint8_t digest[SHA_DIGEST_LENGTH];
630 SHA1(buffer.data() + buffer_index * BLOCKSIZE, BLOCKSIZE, digest);
631 std::string hexdigest = print_sha1(digest);
632 LOG(INFO) << " block number: " << block_num << ", SHA-1: " << hexdigest;
633 }
634}
635
636// If the calculated hash for the whole stash doesn't match the stash id, print the SHA-1
637// in hex for each block.
638static void PrintHashForCorruptedStashedBlocks(const std::string& id,
639 const std::vector<uint8_t>& buffer,
640 const RangeSet& src) {
641 LOG(INFO) << "printing hash in hex for stash_id: " << id;
Tao Baobf5b77d2017-03-30 16:57:29 -0700642 CHECK_EQ(src.blocks() * BLOCKSIZE, buffer.size());
Tianjie Xu2cd36ba2017-03-15 23:52:46 +0000643
Tao Baobf5b77d2017-03-30 16:57:29 -0700644 for (size_t i = 0; i < src.blocks(); i++) {
Tao Bao8f237572017-03-26 13:36:49 -0700645 size_t block_num = src.GetBlockNumber(i);
Tianjie Xu2cd36ba2017-03-15 23:52:46 +0000646
647 uint8_t digest[SHA_DIGEST_LENGTH];
648 SHA1(buffer.data() + i * BLOCKSIZE, BLOCKSIZE, digest);
649 std::string hexdigest = print_sha1(digest);
650 LOG(INFO) << " block number: " << block_num << ", SHA-1: " << hexdigest;
651 }
652}
653
654// If the stash file doesn't exist, read the source blocks this stash contains and print the
655// SHA-1 for these blocks.
656static void PrintHashForMissingStashedBlocks(const std::string& id, int fd) {
657 if (stash_map.find(id) == stash_map.end()) {
658 LOG(ERROR) << "No stash saved for id: " << id;
659 return;
660 }
661
662 LOG(INFO) << "print hash in hex for source blocks in missing stash: " << id;
663 const RangeSet& src = stash_map[id];
Tao Baobf5b77d2017-03-30 16:57:29 -0700664 std::vector<uint8_t> buffer(src.blocks() * BLOCKSIZE);
Tianjie Xu2cd36ba2017-03-15 23:52:46 +0000665 if (ReadBlocks(src, buffer, fd) == -1) {
666 LOG(ERROR) << "failed to read source blocks for stash: " << id;
667 return;
668 }
669 PrintHashForCorruptedStashedBlocks(id, buffer, src);
670}
671
Tao Bao612336d2015-08-27 16:41:21 -0700672static int VerifyBlocks(const std::string& expected, const std::vector<uint8_t>& buffer,
Tao Bao0940fe12015-08-27 16:41:21 -0700673 const size_t blocks, bool printerror) {
Sen Jiangc48cb5e2016-02-04 16:23:21 +0800674 uint8_t digest[SHA_DIGEST_LENGTH];
Tao Bao612336d2015-08-27 16:41:21 -0700675 const uint8_t* data = buffer.data();
Sami Tolvanen90221202014-12-09 16:39:47 +0000676
Sen Jiangc48cb5e2016-02-04 16:23:21 +0800677 SHA1(data, blocks * BLOCKSIZE, digest);
Sami Tolvanen90221202014-12-09 16:39:47 +0000678
Tao Baoe6aa3322015-08-05 15:20:27 -0700679 std::string hexdigest = print_sha1(digest);
Sami Tolvanen90221202014-12-09 16:39:47 +0000680
Tao Bao0940fe12015-08-27 16:41:21 -0700681 if (hexdigest != expected) {
682 if (printerror) {
Tao Bao039f2da2016-11-22 16:29:50 -0800683 LOG(ERROR) << "failed to verify blocks (expected " << expected << ", read "
684 << hexdigest << ")";
Tao Bao0940fe12015-08-27 16:41:21 -0700685 }
686 return -1;
Sami Tolvanen90221202014-12-09 16:39:47 +0000687 }
688
Tao Bao0940fe12015-08-27 16:41:21 -0700689 return 0;
Sami Tolvanen90221202014-12-09 16:39:47 +0000690}
691
Tao Bao0940fe12015-08-27 16:41:21 -0700692static std::string GetStashFileName(const std::string& base, const std::string& id,
Tao Bao641fa972018-04-25 18:59:40 -0700693 const std::string& postfix) {
694 if (base.empty()) {
695 return "";
696 }
Tao Bao864c6682018-05-07 11:38:25 -0700697 std::string filename = Paths::Get().stash_directory_base() + "/" + base;
698 if (id.empty() && postfix.empty()) {
699 return filename;
700 }
701 return filename + "/" + id + postfix;
Sami Tolvanen90221202014-12-09 16:39:47 +0000702}
703
Tao Baoec8272f2017-03-15 17:39:01 -0700704// Does a best effort enumeration of stash files. Ignores possible non-file items in the stash
705// directory and continues despite of errors. Calls the 'callback' function for each file.
706static void EnumerateStash(const std::string& dirname,
707 const std::function<void(const std::string&)>& callback) {
708 if (dirname.empty()) return;
Sami Tolvanen90221202014-12-09 16:39:47 +0000709
Tao Baoec8272f2017-03-15 17:39:01 -0700710 std::unique_ptr<DIR, decltype(&closedir)> directory(opendir(dirname.c_str()), closedir);
Sami Tolvanen90221202014-12-09 16:39:47 +0000711
Tao Baoec8272f2017-03-15 17:39:01 -0700712 if (directory == nullptr) {
713 if (errno != ENOENT) {
714 PLOG(ERROR) << "opendir \"" << dirname << "\" failed";
Sami Tolvanen90221202014-12-09 16:39:47 +0000715 }
Tao Bao51412212016-12-28 14:44:05 -0800716 return;
717 }
Tao Baoe6aa3322015-08-05 15:20:27 -0700718
Tao Baoec8272f2017-03-15 17:39:01 -0700719 dirent* item;
720 while ((item = readdir(directory.get())) != nullptr) {
721 if (item->d_type != DT_REG) continue;
722 callback(dirname + "/" + item->d_name);
Tao Bao51412212016-12-28 14:44:05 -0800723 }
Sami Tolvanen90221202014-12-09 16:39:47 +0000724}
725
726// Deletes the stash directory and all files in it. Assumes that it only
727// contains files. There is nothing we can do about unlikely, but possible
728// errors, so they are merely logged.
Tao Baoec8272f2017-03-15 17:39:01 -0700729static void DeleteFile(const std::string& fn) {
730 if (fn.empty()) return;
Sami Tolvanen90221202014-12-09 16:39:47 +0000731
Tao Baoec8272f2017-03-15 17:39:01 -0700732 LOG(INFO) << "deleting " << fn;
Sami Tolvanen90221202014-12-09 16:39:47 +0000733
Tao Baoec8272f2017-03-15 17:39:01 -0700734 if (unlink(fn.c_str()) == -1 && errno != ENOENT) {
735 PLOG(ERROR) << "unlink \"" << fn << "\" failed";
736 }
Sami Tolvanen90221202014-12-09 16:39:47 +0000737}
738
Tao Baoe6aa3322015-08-05 15:20:27 -0700739static void DeleteStash(const std::string& base) {
Tao Baoec8272f2017-03-15 17:39:01 -0700740 if (base.empty()) return;
741
742 LOG(INFO) << "deleting stash " << base;
743
744 std::string dirname = GetStashFileName(base, "", "");
745 EnumerateStash(dirname, DeleteFile);
746
747 if (rmdir(dirname.c_str()) == -1) {
748 if (errno != ENOENT && errno != ENOTDIR) {
749 PLOG(ERROR) << "rmdir \"" << dirname << "\" failed";
Sami Tolvanen90221202014-12-09 16:39:47 +0000750 }
Tao Baoec8272f2017-03-15 17:39:01 -0700751 }
Sami Tolvanen90221202014-12-09 16:39:47 +0000752}
753
Tao Baobcf46492017-03-23 15:28:20 -0700754static int LoadStash(CommandParameters& params, const std::string& id, bool verify, size_t* blocks,
755 std::vector<uint8_t>& buffer, bool printnoent) {
Tao Baobf5b77d2017-03-30 16:57:29 -0700756 // In verify mode, if source range_set was saved for the given hash, check contents in the source
757 // blocks first. If the check fails, search for the stashed files on /cache as usual.
758 if (!params.canwrite) {
759 if (stash_map.find(id) != stash_map.end()) {
760 const RangeSet& src = stash_map[id];
761 allocate(src.blocks() * BLOCKSIZE, buffer);
Tianjie Xu7eca97e2016-03-22 18:08:12 -0700762
Tao Baobf5b77d2017-03-30 16:57:29 -0700763 if (ReadBlocks(src, buffer, params.fd) == -1) {
764 LOG(ERROR) << "failed to read source blocks in stash map.";
Tao Bao0940fe12015-08-27 16:41:21 -0700765 return -1;
Tao Baobf5b77d2017-03-30 16:57:29 -0700766 }
767 if (VerifyBlocks(id, buffer, src.blocks(), true) != 0) {
768 LOG(ERROR) << "failed to verify loaded source blocks in stash map.";
769 PrintHashForCorruptedStashedBlocks(id, buffer, src);
Tao Bao0940fe12015-08-27 16:41:21 -0700770 return -1;
Tao Baobf5b77d2017-03-30 16:57:29 -0700771 }
772 return 0;
Sami Tolvanen90221202014-12-09 16:39:47 +0000773 }
Tao Baobf5b77d2017-03-30 16:57:29 -0700774 }
Sami Tolvanen90221202014-12-09 16:39:47 +0000775
Tao Baobf5b77d2017-03-30 16:57:29 -0700776 size_t blockcount = 0;
777 if (!blocks) {
778 blocks = &blockcount;
779 }
780
781 std::string fn = GetStashFileName(params.stashbase, id, "");
782
783 struct stat sb;
784 if (stat(fn.c_str(), &sb) == -1) {
785 if (errno != ENOENT || printnoent) {
786 PLOG(ERROR) << "stat \"" << fn << "\" failed";
787 PrintHashForMissingStashedBlocks(id, params.fd);
Sami Tolvanen90221202014-12-09 16:39:47 +0000788 }
Tao Baobf5b77d2017-03-30 16:57:29 -0700789 return -1;
790 }
Sami Tolvanen90221202014-12-09 16:39:47 +0000791
Tao Baobf5b77d2017-03-30 16:57:29 -0700792 LOG(INFO) << " loading " << fn;
Sami Tolvanen90221202014-12-09 16:39:47 +0000793
Tao Baobf5b77d2017-03-30 16:57:29 -0700794 if ((sb.st_size % BLOCKSIZE) != 0) {
795 LOG(ERROR) << fn << " size " << sb.st_size << " not multiple of block size " << BLOCKSIZE;
796 return -1;
797 }
798
799 android::base::unique_fd fd(TEMP_FAILURE_RETRY(ota_open(fn.c_str(), O_RDONLY)));
800 if (fd == -1) {
801 PLOG(ERROR) << "open \"" << fn << "\" failed";
802 return -1;
803 }
804
805 allocate(sb.st_size, buffer);
806
807 if (read_all(fd, buffer, sb.st_size) == -1) {
808 return -1;
809 }
810
811 *blocks = sb.st_size / BLOCKSIZE;
812
813 if (verify && VerifyBlocks(id, buffer, *blocks, true) != 0) {
814 LOG(ERROR) << "unexpected contents in " << fn;
815 if (stash_map.find(id) == stash_map.end()) {
816 LOG(ERROR) << "failed to find source blocks number for stash " << id
817 << " when executing command: " << params.cmdname;
818 } else {
819 const RangeSet& src = stash_map[id];
820 PrintHashForCorruptedStashedBlocks(id, buffer, src);
Sami Tolvanen90221202014-12-09 16:39:47 +0000821 }
Tao Baobf5b77d2017-03-30 16:57:29 -0700822 DeleteFile(fn);
823 return -1;
824 }
Sami Tolvanen90221202014-12-09 16:39:47 +0000825
Tao Baobf5b77d2017-03-30 16:57:29 -0700826 return 0;
Sami Tolvanen90221202014-12-09 16:39:47 +0000827}
828
Tao Bao612336d2015-08-27 16:41:21 -0700829static int WriteStash(const std::string& base, const std::string& id, int blocks,
Tao Baod2aecd42017-03-23 14:43:44 -0700830 std::vector<uint8_t>& buffer, bool checkspace, bool* exists) {
Tao Bao612336d2015-08-27 16:41:21 -0700831 if (base.empty()) {
Tao Bao0940fe12015-08-27 16:41:21 -0700832 return -1;
Sami Tolvanen90221202014-12-09 16:39:47 +0000833 }
834
835 if (checkspace && CacheSizeCheck(blocks * BLOCKSIZE) != 0) {
Tao Bao039f2da2016-11-22 16:29:50 -0800836 LOG(ERROR) << "not enough space to write stash";
Tao Bao0940fe12015-08-27 16:41:21 -0700837 return -1;
Sami Tolvanen90221202014-12-09 16:39:47 +0000838 }
839
Tao Bao0940fe12015-08-27 16:41:21 -0700840 std::string fn = GetStashFileName(base, id, ".partial");
841 std::string cn = GetStashFileName(base, id, "");
Sami Tolvanen90221202014-12-09 16:39:47 +0000842
Sami Tolvanen43b748f2015-04-17 12:50:31 +0100843 if (exists) {
Tao Bao0940fe12015-08-27 16:41:21 -0700844 struct stat sb;
845 int res = stat(cn.c_str(), &sb);
Sami Tolvanen43b748f2015-04-17 12:50:31 +0100846
847 if (res == 0) {
848 // The file already exists and since the name is the hash of the contents,
849 // it's safe to assume the contents are identical (accidental hash collisions
850 // are unlikely)
Tao Bao039f2da2016-11-22 16:29:50 -0800851 LOG(INFO) << " skipping " << blocks << " existing blocks in " << cn;
Tao Bao0940fe12015-08-27 16:41:21 -0700852 *exists = true;
853 return 0;
Sami Tolvanen43b748f2015-04-17 12:50:31 +0100854 }
855
Tao Bao0940fe12015-08-27 16:41:21 -0700856 *exists = false;
Sami Tolvanen43b748f2015-04-17 12:50:31 +0100857 }
858
Tao Bao039f2da2016-11-22 16:29:50 -0800859 LOG(INFO) << " writing " << blocks << " blocks to " << cn;
Sami Tolvanen90221202014-12-09 16:39:47 +0000860
Tao Bao039f2da2016-11-22 16:29:50 -0800861 android::base::unique_fd fd(
862 TEMP_FAILURE_RETRY(ota_open(fn.c_str(), O_WRONLY | O_CREAT | O_TRUNC, STASH_FILE_MODE)));
Sami Tolvanen90221202014-12-09 16:39:47 +0000863 if (fd == -1) {
Tao Bao039f2da2016-11-22 16:29:50 -0800864 PLOG(ERROR) << "failed to create \"" << fn << "\"";
Tao Bao0940fe12015-08-27 16:41:21 -0700865 return -1;
Sami Tolvanen90221202014-12-09 16:39:47 +0000866 }
867
Tianjie Xua946b9e2017-03-21 16:24:57 -0700868 if (fchown(fd, AID_SYSTEM, AID_SYSTEM) != 0) { // system user
869 PLOG(ERROR) << "failed to chown \"" << fn << "\"";
870 return -1;
871 }
872
Sami Tolvanen90221202014-12-09 16:39:47 +0000873 if (write_all(fd, buffer, blocks * BLOCKSIZE) == -1) {
Tao Bao0940fe12015-08-27 16:41:21 -0700874 return -1;
Sami Tolvanen90221202014-12-09 16:39:47 +0000875 }
876
Jed Estepa7b9a462015-12-15 16:04:53 -0800877 if (ota_fsync(fd) == -1) {
Tianjie Xu16255832016-04-30 11:49:59 -0700878 failure_type = kFsyncFailure;
Tao Bao039f2da2016-11-22 16:29:50 -0800879 PLOG(ERROR) << "fsync \"" << fn << "\" failed";
Tao Bao0940fe12015-08-27 16:41:21 -0700880 return -1;
Sami Tolvanen90221202014-12-09 16:39:47 +0000881 }
882
Tao Baoe6aa3322015-08-05 15:20:27 -0700883 if (rename(fn.c_str(), cn.c_str()) == -1) {
Tao Bao039f2da2016-11-22 16:29:50 -0800884 PLOG(ERROR) << "rename(\"" << fn << "\", \"" << cn << "\") failed";
Tao Bao0940fe12015-08-27 16:41:21 -0700885 return -1;
Sami Tolvanen90221202014-12-09 16:39:47 +0000886 }
887
Tao Bao0940fe12015-08-27 16:41:21 -0700888 std::string dname = GetStashFileName(base, "", "");
Tao Bao864c6682018-05-07 11:38:25 -0700889 if (!FsyncDir(dname)) {
890 failure_type = kFsyncFailure;
891 return -1;
Tao Baodc392262015-07-31 15:56:44 -0700892 }
893
Tao Bao0940fe12015-08-27 16:41:21 -0700894 return 0;
Sami Tolvanen90221202014-12-09 16:39:47 +0000895}
896
897// Creates a directory for storing stash files and checks if the /cache partition
898// hash enough space for the expected amount of blocks we need to store. Returns
899// >0 if we created the directory, zero if it existed already, and <0 of failure.
Tao Bao864c6682018-05-07 11:38:25 -0700900static int CreateStash(State* state, size_t maxblocks, const std::string& base) {
Tao Bao51412212016-12-28 14:44:05 -0800901 std::string dirname = GetStashFileName(base, "", "");
902 struct stat sb;
903 int res = stat(dirname.c_str(), &sb);
Tao Bao51412212016-12-28 14:44:05 -0800904 if (res == -1 && errno != ENOENT) {
Tianjie Xu5ad80282018-01-28 15:37:48 -0800905 ErrorAbort(state, kStashCreationFailure, "stat \"%s\" failed: %s", dirname.c_str(),
Tao Bao51412212016-12-28 14:44:05 -0800906 strerror(errno));
907 return -1;
Tao Bao864c6682018-05-07 11:38:25 -0700908 }
909
910 size_t max_stash_size = maxblocks * BLOCKSIZE;
911 if (res == -1) {
Tao Bao51412212016-12-28 14:44:05 -0800912 LOG(INFO) << "creating stash " << dirname;
913 res = mkdir(dirname.c_str(), STASH_DIRECTORY_MODE);
914
915 if (res != 0) {
Tianjie Xu5ad80282018-01-28 15:37:48 -0800916 ErrorAbort(state, kStashCreationFailure, "mkdir \"%s\" failed: %s", dirname.c_str(),
Tao Bao51412212016-12-28 14:44:05 -0800917 strerror(errno));
918 return -1;
Sami Tolvanen90221202014-12-09 16:39:47 +0000919 }
920
Tianjie Xua946b9e2017-03-21 16:24:57 -0700921 if (chown(dirname.c_str(), AID_SYSTEM, AID_SYSTEM) != 0) { // system user
Tianjie Xu5ad80282018-01-28 15:37:48 -0800922 ErrorAbort(state, kStashCreationFailure, "chown \"%s\" failed: %s", dirname.c_str(),
Tianjie Xua946b9e2017-03-21 16:24:57 -0700923 strerror(errno));
924 return -1;
925 }
926
Tao Bao51412212016-12-28 14:44:05 -0800927 if (CacheSizeCheck(max_stash_size) != 0) {
Tianjie Xu5ad80282018-01-28 15:37:48 -0800928 ErrorAbort(state, kStashCreationFailure, "not enough space for stash (%zu needed)",
Tao Bao51412212016-12-28 14:44:05 -0800929 max_stash_size);
930 return -1;
Sami Tolvanen90221202014-12-09 16:39:47 +0000931 }
932
Tao Bao51412212016-12-28 14:44:05 -0800933 return 1; // Created directory
934 }
Sami Tolvanen90221202014-12-09 16:39:47 +0000935
Tao Bao51412212016-12-28 14:44:05 -0800936 LOG(INFO) << "using existing stash " << dirname;
Sami Tolvanen90221202014-12-09 16:39:47 +0000937
Tao Baoec8272f2017-03-15 17:39:01 -0700938 // If the directory already exists, calculate the space already allocated to stash files and check
939 // if there's enough for all required blocks. Delete any partially completed stash files first.
940 EnumerateStash(dirname, [](const std::string& fn) {
941 if (android::base::EndsWith(fn, ".partial")) {
942 DeleteFile(fn);
943 }
944 });
Sami Tolvanen90221202014-12-09 16:39:47 +0000945
Tao Bao51412212016-12-28 14:44:05 -0800946 size_t existing = 0;
Tao Baoec8272f2017-03-15 17:39:01 -0700947 EnumerateStash(dirname, [&existing](const std::string& fn) {
948 if (fn.empty()) return;
949 struct stat sb;
950 if (stat(fn.c_str(), &sb) == -1) {
951 PLOG(ERROR) << "stat \"" << fn << "\" failed";
952 return;
953 }
954 existing += static_cast<size_t>(sb.st_size);
955 });
Sami Tolvanen90221202014-12-09 16:39:47 +0000956
Tao Bao51412212016-12-28 14:44:05 -0800957 if (max_stash_size > existing) {
958 size_t needed = max_stash_size - existing;
959 if (CacheSizeCheck(needed) != 0) {
Tianjie Xu5ad80282018-01-28 15:37:48 -0800960 ErrorAbort(state, kStashCreationFailure, "not enough space for stash (%zu more needed)",
Tao Bao51412212016-12-28 14:44:05 -0800961 needed);
962 return -1;
Sami Tolvanen90221202014-12-09 16:39:47 +0000963 }
Tao Bao51412212016-12-28 14:44:05 -0800964 }
Sami Tolvanen90221202014-12-09 16:39:47 +0000965
Tao Bao51412212016-12-28 14:44:05 -0800966 return 0; // Using existing directory
Sami Tolvanen90221202014-12-09 16:39:47 +0000967}
968
Tao Baobaad2d42015-12-06 16:56:27 -0800969static int FreeStash(const std::string& base, const std::string& id) {
Tao Baoec8272f2017-03-15 17:39:01 -0700970 if (base.empty() || id.empty()) {
971 return -1;
972 }
Sami Tolvanen90221202014-12-09 16:39:47 +0000973
Tao Baoec8272f2017-03-15 17:39:01 -0700974 DeleteFile(GetStashFileName(base, id, ""));
Sami Tolvanen90221202014-12-09 16:39:47 +0000975
Tao Baoec8272f2017-03-15 17:39:01 -0700976 return 0;
Doug Zongker52ae67d2014-09-08 12:22:09 -0700977}
978
Tao Baobf5b77d2017-03-30 16:57:29 -0700979// Source contains packed data, which we want to move to the locations given in locs in the dest
980// buffer. source and dest may be the same buffer.
Tao Bao612336d2015-08-27 16:41:21 -0700981static void MoveRange(std::vector<uint8_t>& dest, const RangeSet& locs,
Tao Baobf5b77d2017-03-30 16:57:29 -0700982 const std::vector<uint8_t>& source) {
983 const uint8_t* from = source.data();
984 uint8_t* to = dest.data();
985 size_t start = locs.blocks();
986 // Must do the movement backward.
987 for (auto it = locs.crbegin(); it != locs.crend(); it++) {
988 size_t blocks = it->second - it->first;
989 start -= blocks;
990 memmove(to + (it->first * BLOCKSIZE), from + (start * BLOCKSIZE), blocks * BLOCKSIZE);
991 }
Doug Zongker52ae67d2014-09-08 12:22:09 -0700992}
993
Tao Baod2aecd42017-03-23 14:43:44 -0700994/**
995 * We expect to parse the remainder of the parameter tokens as one of:
996 *
997 * <src_block_count> <src_range>
998 * (loads data from source image only)
999 *
1000 * <src_block_count> - <[stash_id:stash_range] ...>
1001 * (loads data from stashes only)
1002 *
1003 * <src_block_count> <src_range> <src_loc> <[stash_id:stash_range] ...>
1004 * (loads data from both source image and stashes)
1005 *
1006 * On return, params.buffer is filled with the loaded source data (rearranged and combined with
1007 * stashed data as necessary). buffer may be reallocated if needed to accommodate the source data.
1008 * tgt is the target RangeSet for detecting overlaps. Any stashes required are loaded using
1009 * LoadStash.
1010 */
1011static int LoadSourceBlocks(CommandParameters& params, const RangeSet& tgt, size_t* src_blocks,
1012 bool* overlap) {
1013 CHECK(src_blocks != nullptr);
1014 CHECK(overlap != nullptr);
Doug Zongker52ae67d2014-09-08 12:22:09 -07001015
Tao Baod2aecd42017-03-23 14:43:44 -07001016 // <src_block_count>
1017 const std::string& token = params.tokens[params.cpos++];
1018 if (!android::base::ParseUint(token, src_blocks)) {
1019 LOG(ERROR) << "invalid src_block_count \"" << token << "\"";
1020 return -1;
1021 }
Tao Baobaad2d42015-12-06 16:56:27 -08001022
Tao Baod2aecd42017-03-23 14:43:44 -07001023 allocate(*src_blocks * BLOCKSIZE, params.buffer);
1024
1025 // "-" or <src_range> [<src_loc>]
1026 if (params.tokens[params.cpos] == "-") {
1027 // no source ranges, only stashes
1028 params.cpos++;
1029 } else {
Tao Bao8f237572017-03-26 13:36:49 -07001030 RangeSet src = RangeSet::Parse(params.tokens[params.cpos++]);
Tao Bao67983152017-11-04 00:08:08 -07001031 CHECK(static_cast<bool>(src));
Tao Bao8f237572017-03-26 13:36:49 -07001032 *overlap = src.Overlaps(tgt);
Tao Baod2aecd42017-03-23 14:43:44 -07001033
1034 if (ReadBlocks(src, params.buffer, params.fd) == -1) {
1035 return -1;
Tao Baobaad2d42015-12-06 16:56:27 -08001036 }
1037
Tao Baod2aecd42017-03-23 14:43:44 -07001038 if (params.cpos >= params.tokens.size()) {
1039 // no stashes, only source range
1040 return 0;
Tao Baobaad2d42015-12-06 16:56:27 -08001041 }
Doug Zongker52ae67d2014-09-08 12:22:09 -07001042
Tao Bao8f237572017-03-26 13:36:49 -07001043 RangeSet locs = RangeSet::Parse(params.tokens[params.cpos++]);
Tao Bao67983152017-11-04 00:08:08 -07001044 CHECK(static_cast<bool>(locs));
Tao Baod2aecd42017-03-23 14:43:44 -07001045 MoveRange(params.buffer, locs, params.buffer);
1046 }
Doug Zongker52ae67d2014-09-08 12:22:09 -07001047
Tao Baod2aecd42017-03-23 14:43:44 -07001048 // <[stash_id:stash_range]>
1049 while (params.cpos < params.tokens.size()) {
1050 // Each word is a an index into the stash table, a colon, and then a RangeSet describing where
1051 // in the source block that stashed data should go.
1052 std::vector<std::string> tokens = android::base::Split(params.tokens[params.cpos++], ":");
1053 if (tokens.size() != 2) {
1054 LOG(ERROR) << "invalid parameter";
1055 return -1;
Doug Zongker52ae67d2014-09-08 12:22:09 -07001056 }
1057
Tao Baod2aecd42017-03-23 14:43:44 -07001058 std::vector<uint8_t> stash;
1059 if (LoadStash(params, tokens[0], false, nullptr, stash, true) == -1) {
1060 // These source blocks will fail verification if used later, but we
1061 // will let the caller decide if this is a fatal failure
1062 LOG(ERROR) << "failed to load stash " << tokens[0];
1063 continue;
Sami Tolvanen90221202014-12-09 16:39:47 +00001064 }
1065
Tao Bao8f237572017-03-26 13:36:49 -07001066 RangeSet locs = RangeSet::Parse(tokens[1]);
Tao Bao67983152017-11-04 00:08:08 -07001067 CHECK(static_cast<bool>(locs));
Tao Baod2aecd42017-03-23 14:43:44 -07001068 MoveRange(params.buffer, locs, stash);
1069 }
1070
1071 return 0;
Sami Tolvanen90221202014-12-09 16:39:47 +00001072}
1073
Tao Bao33567772017-03-13 14:57:34 -07001074/**
1075 * Do a source/target load for move/bsdiff/imgdiff in version 3.
1076 *
1077 * We expect to parse the remainder of the parameter tokens as one of:
1078 *
1079 * <tgt_range> <src_block_count> <src_range>
1080 * (loads data from source image only)
1081 *
1082 * <tgt_range> <src_block_count> - <[stash_id:stash_range] ...>
1083 * (loads data from stashes only)
1084 *
1085 * <tgt_range> <src_block_count> <src_range> <src_loc> <[stash_id:stash_range] ...>
1086 * (loads data from both source image and stashes)
1087 *
Tao Baod2aecd42017-03-23 14:43:44 -07001088 * 'onehash' tells whether to expect separate source and targe block hashes, or if they are both the
1089 * same and only one hash should be expected. params.isunresumable will be set to true if block
Tao Bao33567772017-03-13 14:57:34 -07001090 * verification fails in a way that the update cannot be resumed anymore.
1091 *
1092 * If the function is unable to load the necessary blocks or their contents don't match the hashes,
1093 * the return value is -1 and the command should be aborted.
1094 *
1095 * If the return value is 1, the command has already been completed according to the contents of the
1096 * target blocks, and should not be performed again.
1097 *
1098 * If the return value is 0, source blocks have expected content and the command can be performed.
1099 */
Tao Baod2aecd42017-03-23 14:43:44 -07001100static int LoadSrcTgtVersion3(CommandParameters& params, RangeSet& tgt, size_t* src_blocks,
1101 bool onehash, bool* overlap) {
1102 CHECK(src_blocks != nullptr);
1103 CHECK(overlap != nullptr);
Sami Tolvanen90221202014-12-09 16:39:47 +00001104
Tao Baod2aecd42017-03-23 14:43:44 -07001105 if (params.cpos >= params.tokens.size()) {
1106 LOG(ERROR) << "missing source hash";
Tao Bao0940fe12015-08-27 16:41:21 -07001107 return -1;
Tao Baod2aecd42017-03-23 14:43:44 -07001108 }
1109
1110 std::string srchash = params.tokens[params.cpos++];
1111 std::string tgthash;
1112
1113 if (onehash) {
1114 tgthash = srchash;
1115 } else {
1116 if (params.cpos >= params.tokens.size()) {
1117 LOG(ERROR) << "missing target hash";
1118 return -1;
1119 }
1120 tgthash = params.tokens[params.cpos++];
1121 }
1122
1123 // At least it needs to provide three parameters: <tgt_range>, <src_block_count> and
1124 // "-"/<src_range>.
1125 if (params.cpos + 2 >= params.tokens.size()) {
1126 LOG(ERROR) << "invalid parameters";
1127 return -1;
1128 }
1129
1130 // <tgt_range>
Tao Bao8f237572017-03-26 13:36:49 -07001131 tgt = RangeSet::Parse(params.tokens[params.cpos++]);
Tao Bao67983152017-11-04 00:08:08 -07001132 CHECK(static_cast<bool>(tgt));
Tao Baod2aecd42017-03-23 14:43:44 -07001133
Tao Baobf5b77d2017-03-30 16:57:29 -07001134 std::vector<uint8_t> tgtbuffer(tgt.blocks() * BLOCKSIZE);
Tao Baod2aecd42017-03-23 14:43:44 -07001135 if (ReadBlocks(tgt, tgtbuffer, params.fd) == -1) {
1136 return -1;
1137 }
1138
1139 // Return now if target blocks already have expected content.
Tao Baobf5b77d2017-03-30 16:57:29 -07001140 if (VerifyBlocks(tgthash, tgtbuffer, tgt.blocks(), false) == 0) {
Tao Baod2aecd42017-03-23 14:43:44 -07001141 return 1;
1142 }
1143
1144 // Load source blocks.
1145 if (LoadSourceBlocks(params, tgt, src_blocks, overlap) == -1) {
1146 return -1;
1147 }
1148
1149 if (VerifyBlocks(srchash, params.buffer, *src_blocks, true) == 0) {
1150 // If source and target blocks overlap, stash the source blocks so we can
1151 // resume from possible write errors. In verify mode, we can skip stashing
1152 // because the source blocks won't be overwritten.
1153 if (*overlap && params.canwrite) {
1154 LOG(INFO) << "stashing " << *src_blocks << " overlapping blocks to " << srchash;
1155
1156 bool stash_exists = false;
1157 if (WriteStash(params.stashbase, srchash, *src_blocks, params.buffer, true,
1158 &stash_exists) != 0) {
1159 LOG(ERROR) << "failed to stash overlapping source blocks";
1160 return -1;
1161 }
1162
1163 params.stashed += *src_blocks;
1164 // Can be deleted when the write has completed.
1165 if (!stash_exists) {
1166 params.freestash = srchash;
1167 }
1168 }
1169
1170 // Source blocks have expected content, command can proceed.
1171 return 0;
1172 }
1173
1174 if (*overlap && LoadStash(params, srchash, true, nullptr, params.buffer, true) == 0) {
1175 // Overlapping source blocks were previously stashed, command can proceed. We are recovering
1176 // from an interrupted command, so we don't know if the stash can safely be deleted after this
1177 // command.
1178 return 0;
1179 }
1180
1181 // Valid source data not available, update cannot be resumed.
1182 LOG(ERROR) << "partition has unexpected contents";
1183 PrintHashForCorruptedSourceBlocks(params, params.buffer);
1184
1185 params.isunresumable = true;
1186
1187 return -1;
Sami Tolvanen90221202014-12-09 16:39:47 +00001188}
1189
Tao Bao0940fe12015-08-27 16:41:21 -07001190static int PerformCommandMove(CommandParameters& params) {
Tao Bao33567772017-03-13 14:57:34 -07001191 size_t blocks = 0;
1192 bool overlap = false;
1193 RangeSet tgt;
Tao Baod2aecd42017-03-23 14:43:44 -07001194 int status = LoadSrcTgtVersion3(params, tgt, &blocks, true, &overlap);
Sami Tolvanen90221202014-12-09 16:39:47 +00001195
Tao Bao33567772017-03-13 14:57:34 -07001196 if (status == -1) {
1197 LOG(ERROR) << "failed to read blocks for move";
1198 return -1;
1199 }
Sami Tolvanen90221202014-12-09 16:39:47 +00001200
Tao Bao33567772017-03-13 14:57:34 -07001201 if (status == 0) {
1202 params.foundwrites = true;
Tianjie Xu284752e2017-12-05 11:04:17 -08001203 } else {
1204 params.target_verified = true;
1205 if (params.foundwrites) {
1206 LOG(WARNING) << "warning: commands executed out of order [" << params.cmdname << "]";
1207 }
Tao Bao33567772017-03-13 14:57:34 -07001208 }
Sami Tolvanen90221202014-12-09 16:39:47 +00001209
Tao Bao33567772017-03-13 14:57:34 -07001210 if (params.canwrite) {
Sami Tolvanen90221202014-12-09 16:39:47 +00001211 if (status == 0) {
Tao Bao33567772017-03-13 14:57:34 -07001212 LOG(INFO) << " moving " << blocks << " blocks";
1213
1214 if (WriteBlocks(tgt, params.buffer, params.fd) == -1) {
1215 return -1;
1216 }
1217 } else {
1218 LOG(INFO) << "skipping " << blocks << " already moved blocks";
Sami Tolvanen90221202014-12-09 16:39:47 +00001219 }
Tao Bao33567772017-03-13 14:57:34 -07001220 }
Sami Tolvanen90221202014-12-09 16:39:47 +00001221
Tao Bao33567772017-03-13 14:57:34 -07001222 if (!params.freestash.empty()) {
1223 FreeStash(params.stashbase, params.freestash);
1224 params.freestash.clear();
1225 }
Sami Tolvanen90221202014-12-09 16:39:47 +00001226
Tao Baobf5b77d2017-03-30 16:57:29 -07001227 params.written += tgt.blocks();
Sami Tolvanen90221202014-12-09 16:39:47 +00001228
Tao Bao33567772017-03-13 14:57:34 -07001229 return 0;
Sami Tolvanen90221202014-12-09 16:39:47 +00001230}
1231
Tao Bao0940fe12015-08-27 16:41:21 -07001232static int PerformCommandStash(CommandParameters& params) {
Tao Baobcf46492017-03-23 15:28:20 -07001233 // <stash_id> <src_range>
1234 if (params.cpos + 1 >= params.tokens.size()) {
1235 LOG(ERROR) << "missing id and/or src range fields in stash command";
1236 return -1;
1237 }
1238
1239 const std::string& id = params.tokens[params.cpos++];
1240 size_t blocks = 0;
1241 if (LoadStash(params, id, true, &blocks, params.buffer, false) == 0) {
1242 // Stash file already exists and has expected contents. Do not read from source again, as the
1243 // source may have been already overwritten during a previous attempt.
1244 return 0;
1245 }
1246
Tao Bao8f237572017-03-26 13:36:49 -07001247 RangeSet src = RangeSet::Parse(params.tokens[params.cpos++]);
Tao Bao67983152017-11-04 00:08:08 -07001248 CHECK(static_cast<bool>(src));
Tao Baobcf46492017-03-23 15:28:20 -07001249
Tao Baobf5b77d2017-03-30 16:57:29 -07001250 allocate(src.blocks() * BLOCKSIZE, params.buffer);
Tao Baobcf46492017-03-23 15:28:20 -07001251 if (ReadBlocks(src, params.buffer, params.fd) == -1) {
1252 return -1;
1253 }
Tao Baobf5b77d2017-03-30 16:57:29 -07001254 blocks = src.blocks();
Tao Baobcf46492017-03-23 15:28:20 -07001255 stash_map[id] = src;
1256
1257 if (VerifyBlocks(id, params.buffer, blocks, true) != 0) {
1258 // Source blocks have unexpected contents. If we actually need this data later, this is an
1259 // unrecoverable error. However, the command that uses the data may have already completed
1260 // previously, so the possible failure will occur during source block verification.
1261 LOG(ERROR) << "failed to load source blocks for stash " << id;
1262 return 0;
1263 }
1264
1265 // In verify mode, we don't need to stash any blocks.
1266 if (!params.canwrite) {
1267 return 0;
1268 }
1269
1270 LOG(INFO) << "stashing " << blocks << " blocks to " << id;
Tianjie Xu284752e2017-12-05 11:04:17 -08001271 int result = WriteStash(params.stashbase, id, blocks, params.buffer, false, nullptr);
1272 if (result == 0) {
Tianjie Xu284752e2017-12-05 11:04:17 -08001273 params.stashed += blocks;
1274 }
1275 return result;
Sami Tolvanen90221202014-12-09 16:39:47 +00001276}
1277
Tao Bao0940fe12015-08-27 16:41:21 -07001278static int PerformCommandFree(CommandParameters& params) {
Tao Baobcf46492017-03-23 15:28:20 -07001279 // <stash_id>
1280 if (params.cpos >= params.tokens.size()) {
1281 LOG(ERROR) << "missing stash id in free command";
1282 return -1;
1283 }
Tao Baobaad2d42015-12-06 16:56:27 -08001284
Tao Baobcf46492017-03-23 15:28:20 -07001285 const std::string& id = params.tokens[params.cpos++];
1286 stash_map.erase(id);
Tianjie Xu7eca97e2016-03-22 18:08:12 -07001287
Tao Baobcf46492017-03-23 15:28:20 -07001288 if (params.createdstash || params.canwrite) {
1289 return FreeStash(params.stashbase, id);
1290 }
Tianjie Xu7eca97e2016-03-22 18:08:12 -07001291
Tao Baobcf46492017-03-23 15:28:20 -07001292 return 0;
Sami Tolvanen90221202014-12-09 16:39:47 +00001293}
1294
Tao Bao0940fe12015-08-27 16:41:21 -07001295static int PerformCommandZero(CommandParameters& params) {
Tao Baobf5b77d2017-03-30 16:57:29 -07001296 if (params.cpos >= params.tokens.size()) {
1297 LOG(ERROR) << "missing target blocks for zero";
1298 return -1;
1299 }
Sami Tolvanen90221202014-12-09 16:39:47 +00001300
Tao Baobf5b77d2017-03-30 16:57:29 -07001301 RangeSet tgt = RangeSet::Parse(params.tokens[params.cpos++]);
Tao Bao67983152017-11-04 00:08:08 -07001302 CHECK(static_cast<bool>(tgt));
Tao Baobf5b77d2017-03-30 16:57:29 -07001303
1304 LOG(INFO) << " zeroing " << tgt.blocks() << " blocks";
1305
1306 allocate(BLOCKSIZE, params.buffer);
1307 memset(params.buffer.data(), 0, BLOCKSIZE);
1308
1309 if (params.canwrite) {
1310 for (const auto& range : tgt) {
1311 off64_t offset = static_cast<off64_t>(range.first) * BLOCKSIZE;
1312 size_t size = (range.second - range.first) * BLOCKSIZE;
1313 if (!discard_blocks(params.fd, offset, size)) {
Tao Bao0940fe12015-08-27 16:41:21 -07001314 return -1;
Tao Baobf5b77d2017-03-30 16:57:29 -07001315 }
Sami Tolvanen90221202014-12-09 16:39:47 +00001316
Tao Baobf5b77d2017-03-30 16:57:29 -07001317 if (!check_lseek(params.fd, offset, SEEK_SET)) {
1318 return -1;
1319 }
Sami Tolvanen90221202014-12-09 16:39:47 +00001320
Tao Baobf5b77d2017-03-30 16:57:29 -07001321 for (size_t j = range.first; j < range.second; ++j) {
1322 if (write_all(params.fd, params.buffer, BLOCKSIZE) == -1) {
1323 return -1;
Sami Tolvanen90221202014-12-09 16:39:47 +00001324 }
Tao Baobf5b77d2017-03-30 16:57:29 -07001325 }
Sami Tolvanen90221202014-12-09 16:39:47 +00001326 }
Tao Baobf5b77d2017-03-30 16:57:29 -07001327 }
Sami Tolvanen90221202014-12-09 16:39:47 +00001328
Tao Baobf5b77d2017-03-30 16:57:29 -07001329 if (params.cmdname[0] == 'z') {
1330 // Update only for the zero command, as the erase command will call
1331 // this if DEBUG_ERASE is defined.
1332 params.written += tgt.blocks();
1333 }
Sami Tolvanen90221202014-12-09 16:39:47 +00001334
Tao Baobf5b77d2017-03-30 16:57:29 -07001335 return 0;
Sami Tolvanen90221202014-12-09 16:39:47 +00001336}
1337
Tao Bao0940fe12015-08-27 16:41:21 -07001338static int PerformCommandNew(CommandParameters& params) {
Tao Bao60a70af2017-03-26 14:03:52 -07001339 if (params.cpos >= params.tokens.size()) {
1340 LOG(ERROR) << "missing target blocks for new";
1341 return -1;
1342 }
Sami Tolvanen90221202014-12-09 16:39:47 +00001343
Tao Bao8f237572017-03-26 13:36:49 -07001344 RangeSet tgt = RangeSet::Parse(params.tokens[params.cpos++]);
Tao Bao67983152017-11-04 00:08:08 -07001345 CHECK(static_cast<bool>(tgt));
Tao Bao60a70af2017-03-26 14:03:52 -07001346
1347 if (params.canwrite) {
Tao Baobf5b77d2017-03-30 16:57:29 -07001348 LOG(INFO) << " writing " << tgt.blocks() << " blocks of new data";
Tao Bao60a70af2017-03-26 14:03:52 -07001349
Tao Bao60a70af2017-03-26 14:03:52 -07001350 pthread_mutex_lock(&params.nti.mu);
Tianjie Xu6ed175d2017-07-18 11:29:40 -07001351 params.nti.writer = std::make_unique<RangeSinkWriter>(params.fd, tgt);
Tao Bao60a70af2017-03-26 14:03:52 -07001352 pthread_cond_broadcast(&params.nti.cv);
1353
1354 while (params.nti.writer != nullptr) {
Tianjie Xu3a8d98d2017-04-03 20:01:17 -07001355 if (!params.nti.receiver_available) {
1356 LOG(ERROR) << "missing " << (tgt.blocks() * BLOCKSIZE - params.nti.writer->BytesWritten())
1357 << " bytes of new data";
1358 pthread_mutex_unlock(&params.nti.mu);
1359 return -1;
1360 }
Tao Bao60a70af2017-03-26 14:03:52 -07001361 pthread_cond_wait(&params.nti.cv, &params.nti.mu);
Sami Tolvanen90221202014-12-09 16:39:47 +00001362 }
1363
Tao Bao60a70af2017-03-26 14:03:52 -07001364 pthread_mutex_unlock(&params.nti.mu);
1365 }
Sami Tolvanen90221202014-12-09 16:39:47 +00001366
Tao Baobf5b77d2017-03-30 16:57:29 -07001367 params.written += tgt.blocks();
Sami Tolvanen90221202014-12-09 16:39:47 +00001368
Tao Bao60a70af2017-03-26 14:03:52 -07001369 return 0;
Sami Tolvanen90221202014-12-09 16:39:47 +00001370}
1371
Tao Bao0940fe12015-08-27 16:41:21 -07001372static int PerformCommandDiff(CommandParameters& params) {
Tao Baoc0e1c462017-02-01 10:20:10 -08001373 // <offset> <length>
1374 if (params.cpos + 1 >= params.tokens.size()) {
1375 LOG(ERROR) << "missing patch offset or length for " << params.cmdname;
1376 return -1;
1377 }
Tao Bao0940fe12015-08-27 16:41:21 -07001378
Tao Baoc0e1c462017-02-01 10:20:10 -08001379 size_t offset;
1380 if (!android::base::ParseUint(params.tokens[params.cpos++], &offset)) {
1381 LOG(ERROR) << "invalid patch offset";
1382 return -1;
1383 }
Tao Bao0940fe12015-08-27 16:41:21 -07001384
Tao Baoc0e1c462017-02-01 10:20:10 -08001385 size_t len;
1386 if (!android::base::ParseUint(params.tokens[params.cpos++], &len)) {
1387 LOG(ERROR) << "invalid patch len";
1388 return -1;
1389 }
Tao Bao0940fe12015-08-27 16:41:21 -07001390
Tao Baoc0e1c462017-02-01 10:20:10 -08001391 RangeSet tgt;
1392 size_t blocks = 0;
1393 bool overlap = false;
1394 int status = LoadSrcTgtVersion3(params, tgt, &blocks, false, &overlap);
Tao Bao0940fe12015-08-27 16:41:21 -07001395
Tao Baoc0e1c462017-02-01 10:20:10 -08001396 if (status == -1) {
1397 LOG(ERROR) << "failed to read blocks for diff";
1398 return -1;
1399 }
Sami Tolvanen90221202014-12-09 16:39:47 +00001400
Tao Baoc0e1c462017-02-01 10:20:10 -08001401 if (status == 0) {
1402 params.foundwrites = true;
Tianjie Xu284752e2017-12-05 11:04:17 -08001403 } else {
1404 params.target_verified = true;
1405 if (params.foundwrites) {
1406 LOG(WARNING) << "warning: commands executed out of order [" << params.cmdname << "]";
1407 }
Tao Baoc0e1c462017-02-01 10:20:10 -08001408 }
Sami Tolvanen90221202014-12-09 16:39:47 +00001409
Tao Baoc0e1c462017-02-01 10:20:10 -08001410 if (params.canwrite) {
Sami Tolvanen90221202014-12-09 16:39:47 +00001411 if (status == 0) {
Tao Baobf5b77d2017-03-30 16:57:29 -07001412 LOG(INFO) << "patching " << blocks << " blocks to " << tgt.blocks();
Tao Baoc0e1c462017-02-01 10:20:10 -08001413 Value patch_value(
1414 VAL_BLOB, std::string(reinterpret_cast<const char*>(params.patch_start + offset), len));
Sami Tolvanen90221202014-12-09 16:39:47 +00001415
Tao Bao60a70af2017-03-26 14:03:52 -07001416 RangeSinkWriter writer(params.fd, tgt);
Tao Baoc0e1c462017-02-01 10:20:10 -08001417 if (params.cmdname[0] == 'i') { // imgdiff
Tao Bao1e0941f2017-11-10 11:49:53 -08001418 if (ApplyImagePatch(params.buffer.data(), blocks * BLOCKSIZE, patch_value,
Tao Bao60a70af2017-03-26 14:03:52 -07001419 std::bind(&RangeSinkWriter::Write, &writer, std::placeholders::_1,
1420 std::placeholders::_2),
Tao Bao8b0b0f12018-04-19 21:02:13 -07001421 nullptr) != 0) {
Tao Baoc0e1c462017-02-01 10:20:10 -08001422 LOG(ERROR) << "Failed to apply image patch.";
Tianjie Xu69575552017-05-16 15:51:46 -07001423 failure_type = kPatchApplicationFailure;
Tao Baoc0e1c462017-02-01 10:20:10 -08001424 return -1;
Sami Tolvanen90221202014-12-09 16:39:47 +00001425 }
Tao Baoc0e1c462017-02-01 10:20:10 -08001426 } else {
Tao Bao1e0941f2017-11-10 11:49:53 -08001427 if (ApplyBSDiffPatch(params.buffer.data(), blocks * BLOCKSIZE, patch_value, 0,
Tao Bao60a70af2017-03-26 14:03:52 -07001428 std::bind(&RangeSinkWriter::Write, &writer, std::placeholders::_1,
Tao Bao8b0b0f12018-04-19 21:02:13 -07001429 std::placeholders::_2)) != 0) {
Tao Baoc0e1c462017-02-01 10:20:10 -08001430 LOG(ERROR) << "Failed to apply bsdiff patch.";
Tianjie Xu69575552017-05-16 15:51:46 -07001431 failure_type = kPatchApplicationFailure;
Tao Baoc0e1c462017-02-01 10:20:10 -08001432 return -1;
1433 }
1434 }
1435
1436 // We expect the output of the patcher to fill the tgt ranges exactly.
Tao Bao60a70af2017-03-26 14:03:52 -07001437 if (!writer.Finished()) {
Tao Baoc0e1c462017-02-01 10:20:10 -08001438 LOG(ERROR) << "range sink underrun?";
1439 }
1440 } else {
Tao Baobf5b77d2017-03-30 16:57:29 -07001441 LOG(INFO) << "skipping " << blocks << " blocks already patched to " << tgt.blocks() << " ["
Tao Baoc0e1c462017-02-01 10:20:10 -08001442 << params.cmdline << "]";
Sami Tolvanen90221202014-12-09 16:39:47 +00001443 }
Tao Baoc0e1c462017-02-01 10:20:10 -08001444 }
Sami Tolvanen90221202014-12-09 16:39:47 +00001445
Tao Baoc0e1c462017-02-01 10:20:10 -08001446 if (!params.freestash.empty()) {
1447 FreeStash(params.stashbase, params.freestash);
1448 params.freestash.clear();
1449 }
Sami Tolvanen90221202014-12-09 16:39:47 +00001450
Tao Baobf5b77d2017-03-30 16:57:29 -07001451 params.written += tgt.blocks();
Sami Tolvanen90221202014-12-09 16:39:47 +00001452
Tao Baoc0e1c462017-02-01 10:20:10 -08001453 return 0;
Sami Tolvanen90221202014-12-09 16:39:47 +00001454}
1455
Tao Bao0940fe12015-08-27 16:41:21 -07001456static int PerformCommandErase(CommandParameters& params) {
Tao Baobf5b77d2017-03-30 16:57:29 -07001457 if (DEBUG_ERASE) {
1458 return PerformCommandZero(params);
1459 }
Sami Tolvanen90221202014-12-09 16:39:47 +00001460
Tao Baobf5b77d2017-03-30 16:57:29 -07001461 struct stat sb;
1462 if (fstat(params.fd, &sb) == -1) {
1463 PLOG(ERROR) << "failed to fstat device to erase";
1464 return -1;
1465 }
1466
1467 if (!S_ISBLK(sb.st_mode)) {
1468 LOG(ERROR) << "not a block device; skipping erase";
1469 return -1;
1470 }
1471
1472 if (params.cpos >= params.tokens.size()) {
1473 LOG(ERROR) << "missing target blocks for erase";
1474 return -1;
1475 }
1476
1477 RangeSet tgt = RangeSet::Parse(params.tokens[params.cpos++]);
Tao Bao67983152017-11-04 00:08:08 -07001478 CHECK(static_cast<bool>(tgt));
Tao Baobf5b77d2017-03-30 16:57:29 -07001479
1480 if (params.canwrite) {
1481 LOG(INFO) << " erasing " << tgt.blocks() << " blocks";
1482
1483 for (const auto& range : tgt) {
1484 uint64_t blocks[2];
1485 // offset in bytes
1486 blocks[0] = range.first * static_cast<uint64_t>(BLOCKSIZE);
1487 // length in bytes
1488 blocks[1] = (range.second - range.first) * static_cast<uint64_t>(BLOCKSIZE);
1489
1490 if (ioctl(params.fd, BLKDISCARD, &blocks) == -1) {
1491 PLOG(ERROR) << "BLKDISCARD ioctl failed";
Tao Bao0940fe12015-08-27 16:41:21 -07001492 return -1;
Tao Baobf5b77d2017-03-30 16:57:29 -07001493 }
Sami Tolvanen90221202014-12-09 16:39:47 +00001494 }
Tao Baobf5b77d2017-03-30 16:57:29 -07001495 }
Sami Tolvanen90221202014-12-09 16:39:47 +00001496
Tao Baobf5b77d2017-03-30 16:57:29 -07001497 return 0;
Sami Tolvanen90221202014-12-09 16:39:47 +00001498}
1499
Tao Baoc3901232018-05-21 16:05:56 -07001500using CommandFunction = std::function<int(CommandParameters&)>;
Sami Tolvanen90221202014-12-09 16:39:47 +00001501
Tao Baoc3901232018-05-21 16:05:56 -07001502using CommandMap = std::unordered_map<Command::Type, CommandFunction>;
Doug Zongkerbc7ffed2014-08-15 14:31:52 -07001503
Tianjie Xuc4447322017-03-06 14:44:59 -08001504static Value* PerformBlockImageUpdate(const char* name, State* state,
1505 const std::vector<std::unique_ptr<Expr>>& argv,
Tao Baoc3901232018-05-21 16:05:56 -07001506 const CommandMap& command_map, bool dryrun) {
Tao Bao33567772017-03-13 14:57:34 -07001507 CommandParameters params = {};
1508 params.canwrite = !dryrun;
Sami Tolvanen90221202014-12-09 16:39:47 +00001509
Tao Bao33567772017-03-13 14:57:34 -07001510 LOG(INFO) << "performing " << (dryrun ? "verification" : "update");
1511 if (state->is_retry) {
1512 is_retry = true;
1513 LOG(INFO) << "This update is a retry.";
1514 }
1515 if (argv.size() != 4) {
1516 ErrorAbort(state, kArgsParsingFailure, "block_image_update expects 4 arguments, got %zu",
1517 argv.size());
1518 return StringValue("");
1519 }
1520
1521 std::vector<std::unique_ptr<Value>> args;
1522 if (!ReadValueArgs(state, argv, &args)) {
1523 return nullptr;
1524 }
1525
Tao Baoc3901232018-05-21 16:05:56 -07001526 // args:
1527 // - block device (or file) to modify in-place
1528 // - transfer list (blob)
1529 // - new data stream (filename within package.zip)
1530 // - patch stream (filename within package.zip, must be uncompressed)
Tao Baoc97edcb2017-03-31 01:18:13 -07001531 const std::unique_ptr<Value>& blockdev_filename = args[0];
1532 const std::unique_ptr<Value>& transfer_list_value = args[1];
1533 const std::unique_ptr<Value>& new_data_fn = args[2];
1534 const std::unique_ptr<Value>& patch_data_fn = args[3];
Tao Bao33567772017-03-13 14:57:34 -07001535
1536 if (blockdev_filename->type != VAL_STRING) {
1537 ErrorAbort(state, kArgsParsingFailure, "blockdev_filename argument to %s must be string", name);
1538 return StringValue("");
1539 }
1540 if (transfer_list_value->type != VAL_BLOB) {
1541 ErrorAbort(state, kArgsParsingFailure, "transfer_list argument to %s must be blob", name);
1542 return StringValue("");
1543 }
1544 if (new_data_fn->type != VAL_STRING) {
1545 ErrorAbort(state, kArgsParsingFailure, "new_data_fn argument to %s must be string", name);
1546 return StringValue("");
1547 }
1548 if (patch_data_fn->type != VAL_STRING) {
1549 ErrorAbort(state, kArgsParsingFailure, "patch_data_fn argument to %s must be string", name);
1550 return StringValue("");
1551 }
1552
1553 UpdaterInfo* ui = static_cast<UpdaterInfo*>(state->cookie);
1554 if (ui == nullptr) {
1555 return StringValue("");
1556 }
1557
1558 FILE* cmd_pipe = ui->cmd_pipe;
1559 ZipArchiveHandle za = ui->package_zip;
1560
1561 if (cmd_pipe == nullptr || za == nullptr) {
1562 return StringValue("");
1563 }
1564
1565 ZipString path_data(patch_data_fn->data.c_str());
1566 ZipEntry patch_entry;
1567 if (FindEntry(za, path_data, &patch_entry) != 0) {
1568 LOG(ERROR) << name << "(): no file \"" << patch_data_fn->data << "\" in package";
1569 return StringValue("");
1570 }
1571
1572 params.patch_start = ui->package_zip_addr + patch_entry.offset;
1573 ZipString new_data(new_data_fn->data.c_str());
1574 ZipEntry new_entry;
1575 if (FindEntry(za, new_data, &new_entry) != 0) {
1576 LOG(ERROR) << name << "(): no file \"" << new_data_fn->data << "\" in package";
1577 return StringValue("");
1578 }
1579
1580 params.fd.reset(TEMP_FAILURE_RETRY(ota_open(blockdev_filename->data.c_str(), O_RDWR)));
1581 if (params.fd == -1) {
1582 PLOG(ERROR) << "open \"" << blockdev_filename->data << "\" failed";
1583 return StringValue("");
1584 }
1585
Tao Bao864c6682018-05-07 11:38:25 -07001586 // Stash directory should be different for each partition to avoid conflicts when updating
1587 // multiple partitions at the same time, so we use the hash of the block device name as the base
1588 // directory.
1589 uint8_t digest[SHA_DIGEST_LENGTH];
1590 SHA1(reinterpret_cast<const uint8_t*>(blockdev_filename->data.data()),
1591 blockdev_filename->data.size(), digest);
1592 params.stashbase = print_sha1(digest);
1593
1594 // Possibly do return early on retry, by checking the marker. If the update on this partition has
1595 // been finished (but interrupted at a later point), there could be leftover on /cache that would
1596 // fail the no-op retry.
1597 std::string updated_marker = GetStashFileName(params.stashbase + ".UPDATED", "", "");
1598 if (is_retry) {
1599 struct stat sb;
1600 int result = stat(updated_marker.c_str(), &sb);
1601 if (result == 0) {
1602 LOG(INFO) << "Skipping already updated partition " << blockdev_filename->data
1603 << " based on marker";
1604 return StringValue("t");
1605 }
1606 } else {
1607 // Delete the obsolete marker if any.
1608 std::string err;
1609 if (!android::base::RemoveFileIfExists(updated_marker, &err)) {
1610 LOG(ERROR) << "Failed to remove partition updated marker " << updated_marker << ": " << err;
1611 return StringValue("");
1612 }
1613 }
1614
Tao Bao33567772017-03-13 14:57:34 -07001615 if (params.canwrite) {
1616 params.nti.za = za;
1617 params.nti.entry = new_entry;
Tianjie Xu107a34f2017-06-29 17:04:21 -07001618 params.nti.brotli_compressed = android::base::EndsWith(new_data_fn->data, ".br");
1619 if (params.nti.brotli_compressed) {
1620 // Initialize brotli decoder state.
1621 params.nti.brotli_decoder_state = BrotliDecoderCreateInstance(nullptr, nullptr, nullptr);
1622 }
Tianjie Xu3a8d98d2017-04-03 20:01:17 -07001623 params.nti.receiver_available = true;
Tao Bao33567772017-03-13 14:57:34 -07001624
1625 pthread_mutex_init(&params.nti.mu, nullptr);
1626 pthread_cond_init(&params.nti.cv, nullptr);
1627 pthread_attr_t attr;
1628 pthread_attr_init(&attr);
1629 pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_JOINABLE);
1630
1631 int error = pthread_create(&params.thread, &attr, unzip_new_data, &params.nti);
1632 if (error != 0) {
1633 PLOG(ERROR) << "pthread_create failed";
1634 return StringValue("");
Tianjie Xu7ce287d2016-05-31 09:29:49 -07001635 }
Tao Bao33567772017-03-13 14:57:34 -07001636 }
1637
1638 std::vector<std::string> lines = android::base::Split(transfer_list_value->data, "\n");
1639 if (lines.size() < 2) {
Tianjie Xu5ad80282018-01-28 15:37:48 -08001640 ErrorAbort(state, kArgsParsingFailure, "too few lines in the transfer list [%zd]",
Tao Bao33567772017-03-13 14:57:34 -07001641 lines.size());
1642 return StringValue("");
1643 }
1644
1645 // First line in transfer list is the version number.
1646 if (!android::base::ParseInt(lines[0], &params.version, 3, 4)) {
1647 LOG(ERROR) << "unexpected transfer list version [" << lines[0] << "]";
1648 return StringValue("");
1649 }
1650
1651 LOG(INFO) << "blockimg version is " << params.version;
1652
1653 // Second line in transfer list is the total number of blocks we expect to write.
1654 size_t total_blocks;
1655 if (!android::base::ParseUint(lines[1], &total_blocks)) {
Tianjie Xu5ad80282018-01-28 15:37:48 -08001656 ErrorAbort(state, kArgsParsingFailure, "unexpected block count [%s]", lines[1].c_str());
Tao Bao33567772017-03-13 14:57:34 -07001657 return StringValue("");
1658 }
1659
1660 if (total_blocks == 0) {
1661 return StringValue("t");
1662 }
1663
Tao Bao33567772017-03-13 14:57:34 -07001664 if (lines.size() < 4) {
Tianjie Xu5ad80282018-01-28 15:37:48 -08001665 ErrorAbort(state, kArgsParsingFailure, "too few lines in the transfer list [%zu]",
Tao Bao33567772017-03-13 14:57:34 -07001666 lines.size());
1667 return StringValue("");
1668 }
1669
1670 // Third line is how many stash entries are needed simultaneously.
1671 LOG(INFO) << "maximum stash entries " << lines[2];
1672
1673 // Fourth line is the maximum number of blocks that will be stashed simultaneously
1674 size_t stash_max_blocks;
1675 if (!android::base::ParseUint(lines[3], &stash_max_blocks)) {
Tianjie Xu5ad80282018-01-28 15:37:48 -08001676 ErrorAbort(state, kArgsParsingFailure, "unexpected maximum stash blocks [%s]",
Tao Bao33567772017-03-13 14:57:34 -07001677 lines[3].c_str());
1678 return StringValue("");
1679 }
1680
Tao Bao864c6682018-05-07 11:38:25 -07001681 int res = CreateStash(state, stash_max_blocks, params.stashbase);
Tao Bao33567772017-03-13 14:57:34 -07001682 if (res == -1) {
1683 return StringValue("");
1684 }
1685
1686 params.createdstash = res;
1687
Tao Bao26efb0a2018-05-21 14:59:55 -07001688 // When performing an update, save the index and cmdline of the current command into the
1689 // last_command_file.
Tianjie Xu284752e2017-12-05 11:04:17 -08001690 // Upon resuming an update, read the saved index first; then
1691 // 1. In verification mode, check if the 'move' or 'diff' commands before the saved index has
1692 // the expected target blocks already. If not, these commands cannot be skipped and we need
1693 // to attempt to execute them again. Therefore, we will delete the last_command_file so that
1694 // the update will resume from the start of the transfer list.
1695 // 2. In update mode, skip all commands before the saved index. Therefore, we can avoid deleting
1696 // stashes with duplicate id unintentionally (b/69858743); and also speed up the update.
1697 // If an update succeeds or is unresumable, delete the last_command_file.
Tao Bao26efb0a2018-05-21 14:59:55 -07001698 bool skip_executed_command = true;
1699 size_t saved_last_command_index;
Tianjie Xu284752e2017-12-05 11:04:17 -08001700 if (!ParseLastCommandFile(&saved_last_command_index)) {
1701 DeleteLastCommandFile();
Tao Bao26efb0a2018-05-21 14:59:55 -07001702 // We failed to parse the last command. Disallow skipping executed commands.
1703 skip_executed_command = false;
Tianjie Xu284752e2017-12-05 11:04:17 -08001704 }
1705
Tao Bao33567772017-03-13 14:57:34 -07001706 int rc = -1;
1707
Tao Baoab207062018-05-21 14:48:49 -07001708 static constexpr size_t kTransferListHeaderLines = 4;
Tao Bao33567772017-03-13 14:57:34 -07001709 // Subsequent lines are all individual transfer commands
Tao Baoab207062018-05-21 14:48:49 -07001710 for (size_t i = kTransferListHeaderLines; i < lines.size(); i++) {
Tianjie Xu284752e2017-12-05 11:04:17 -08001711 const std::string& line = lines[i];
Tao Bao33567772017-03-13 14:57:34 -07001712 if (line.empty()) continue;
1713
Tao Bao26efb0a2018-05-21 14:59:55 -07001714 size_t cmdindex = i - kTransferListHeaderLines;
Tao Bao33567772017-03-13 14:57:34 -07001715 params.tokens = android::base::Split(line, " ");
1716 params.cpos = 0;
Tao Baoc3901232018-05-21 16:05:56 -07001717 params.cmdname = params.tokens[params.cpos++];
1718 params.cmdline = line;
Tianjie Xu284752e2017-12-05 11:04:17 -08001719 params.target_verified = false;
Tao Bao33567772017-03-13 14:57:34 -07001720
Tao Baoc3901232018-05-21 16:05:56 -07001721 Command::Type cmd_type = Command::ParseType(params.cmdname);
1722 if (cmd_type == Command::Type::LAST) {
Tao Bao33567772017-03-13 14:57:34 -07001723 LOG(ERROR) << "unexpected command [" << params.cmdname << "]";
1724 goto pbiudone;
Tianjie Xuc4447322017-03-06 14:44:59 -08001725 }
Doug Zongkerbc7ffed2014-08-15 14:31:52 -07001726
Tao Baoc3901232018-05-21 16:05:56 -07001727 const CommandFunction& performer = command_map.at(cmd_type);
Tianjie Xu5fe280a2016-10-17 18:15:20 -07001728
Tianjie Xuc2420842018-02-27 17:05:39 -08001729 // Skip the command if we explicitly set the corresponding function pointer to nullptr, e.g.
1730 // "erase" during block_image_verify.
Tao Baoc3901232018-05-21 16:05:56 -07001731 if (performer == nullptr) {
Tianjie Xuc2420842018-02-27 17:05:39 -08001732 LOG(DEBUG) << "skip executing command [" << line << "]";
1733 continue;
Tianjie Xu284752e2017-12-05 11:04:17 -08001734 }
1735
Tao Bao98f875e2018-05-07 15:03:30 -07001736 // Skip all commands before the saved last command index when resuming an update, except for
1737 // "new" command. Because new commands read in the data sequentially.
Tao Bao26efb0a2018-05-21 14:59:55 -07001738 if (params.canwrite && skip_executed_command && cmdindex <= saved_last_command_index &&
Tao Baoc3901232018-05-21 16:05:56 -07001739 cmd_type != Command::Type::NEW) {
Tao Bao26efb0a2018-05-21 14:59:55 -07001740 LOG(INFO) << "Skipping already executed command: " << cmdindex
Tianjie Xu284752e2017-12-05 11:04:17 -08001741 << ", last executed command for previous update: " << saved_last_command_index;
1742 continue;
1743 }
1744
Tao Baoc3901232018-05-21 16:05:56 -07001745 if (performer(params) == -1) {
Tao Bao33567772017-03-13 14:57:34 -07001746 LOG(ERROR) << "failed to execute command [" << line << "]";
1747 goto pbiudone;
Doug Zongkerbc7ffed2014-08-15 14:31:52 -07001748 }
1749
Tao Bao26efb0a2018-05-21 14:59:55 -07001750 // In verify mode, check if the commands before the saved last_command_index have been executed
1751 // correctly. If some target blocks have unexpected contents, delete the last command file so
1752 // that we will resume the update from the first command in the transfer list.
1753 if (!params.canwrite && skip_executed_command && cmdindex <= saved_last_command_index) {
Tianjie Xu284752e2017-12-05 11:04:17 -08001754 // TODO(xunchang) check that the cmdline of the saved index is correct.
Tao Baoc3901232018-05-21 16:05:56 -07001755 if ((cmd_type == Command::Type::MOVE || cmd_type == Command::Type::BSDIFF ||
1756 cmd_type == Command::Type::IMGDIFF) &&
Tianjie Xu284752e2017-12-05 11:04:17 -08001757 !params.target_verified) {
1758 LOG(WARNING) << "Previously executed command " << saved_last_command_index << ": "
1759 << params.cmdline << " doesn't produce expected target blocks.";
Tao Bao26efb0a2018-05-21 14:59:55 -07001760 skip_executed_command = false;
Tianjie Xu284752e2017-12-05 11:04:17 -08001761 DeleteLastCommandFile();
1762 }
1763 }
Tao Baoc3901232018-05-21 16:05:56 -07001764
Sami Tolvanen90221202014-12-09 16:39:47 +00001765 if (params.canwrite) {
Tao Bao33567772017-03-13 14:57:34 -07001766 if (ota_fsync(params.fd) == -1) {
Tianjie Xu16255832016-04-30 11:49:59 -07001767 failure_type = kFsyncFailure;
Tao Bao039f2da2016-11-22 16:29:50 -08001768 PLOG(ERROR) << "fsync failed";
Tao Bao33567772017-03-13 14:57:34 -07001769 goto pbiudone;
1770 }
Tianjie Xuc2b2bb52018-05-15 15:09:59 -07001771
Tao Bao26efb0a2018-05-21 14:59:55 -07001772 if (!UpdateLastCommandIndex(cmdindex, params.cmdline)) {
Tianjie Xuc2b2bb52018-05-15 15:09:59 -07001773 LOG(WARNING) << "Failed to update the last command file.";
1774 }
1775
Tao Bao33567772017-03-13 14:57:34 -07001776 fprintf(cmd_pipe, "set_progress %.4f\n", static_cast<double>(params.written) / total_blocks);
1777 fflush(cmd_pipe);
Sami Tolvanen90221202014-12-09 16:39:47 +00001778 }
Tao Bao33567772017-03-13 14:57:34 -07001779 }
Sami Tolvanen90221202014-12-09 16:39:47 +00001780
Tao Bao33567772017-03-13 14:57:34 -07001781 rc = 0;
Tianjie Xu16255832016-04-30 11:49:59 -07001782
Tao Bao33567772017-03-13 14:57:34 -07001783pbiudone:
Tianjie Xu5450c842017-10-18 13:15:21 -07001784 if (params.canwrite) {
1785 pthread_mutex_lock(&params.nti.mu);
1786 if (params.nti.receiver_available) {
1787 LOG(WARNING) << "new data receiver is still available after executing all commands.";
1788 }
1789 params.nti.receiver_available = false;
1790 pthread_cond_broadcast(&params.nti.cv);
1791 pthread_mutex_unlock(&params.nti.mu);
1792 int ret = pthread_join(params.thread, nullptr);
1793 if (ret != 0) {
1794 LOG(WARNING) << "pthread join returned with " << strerror(ret);
1795 }
1796
1797 if (rc == 0) {
1798 LOG(INFO) << "wrote " << params.written << " blocks; expected " << total_blocks;
1799 LOG(INFO) << "stashed " << params.stashed << " blocks";
1800 LOG(INFO) << "max alloc needed was " << params.buffer.size();
1801
1802 const char* partition = strrchr(blockdev_filename->data.c_str(), '/');
1803 if (partition != nullptr && *(partition + 1) != 0) {
1804 fprintf(cmd_pipe, "log bytes_written_%s: %zu\n", partition + 1, params.written * BLOCKSIZE);
1805 fprintf(cmd_pipe, "log bytes_stashed_%s: %zu\n", partition + 1, params.stashed * BLOCKSIZE);
1806 fflush(cmd_pipe);
1807 }
1808 // Delete stash only after successfully completing the update, as it may contain blocks needed
1809 // to complete the update later.
1810 DeleteStash(params.stashbase);
Tianjie Xu284752e2017-12-05 11:04:17 -08001811 DeleteLastCommandFile();
Tao Bao864c6682018-05-07 11:38:25 -07001812
1813 // Create a marker on /cache partition, which allows skipping the update on this partition on
1814 // retry. The marker will be removed once booting into normal boot, or before starting next
1815 // fresh install.
1816 if (!SetPartitionUpdatedMarker(updated_marker)) {
1817 LOG(WARNING) << "Failed to set updated marker; continuing";
1818 }
Tianjie Xu5450c842017-10-18 13:15:21 -07001819 }
1820
1821 pthread_mutex_destroy(&params.nti.mu);
1822 pthread_cond_destroy(&params.nti.cv);
1823 } else if (rc == 0) {
1824 LOG(INFO) << "verified partition contents; update may be resumed";
1825 }
1826
Tao Bao33567772017-03-13 14:57:34 -07001827 if (ota_fsync(params.fd) == -1) {
1828 failure_type = kFsyncFailure;
1829 PLOG(ERROR) << "fsync failed";
1830 }
1831 // params.fd will be automatically closed because it's a unique_fd.
1832
Tianjie Xu107a34f2017-06-29 17:04:21 -07001833 if (params.nti.brotli_decoder_state != nullptr) {
1834 BrotliDecoderDestroyInstance(params.nti.brotli_decoder_state);
1835 }
1836
Tianjie Xu284752e2017-12-05 11:04:17 -08001837 // Delete the last command file if the update cannot be resumed.
1838 if (params.isunresumable) {
1839 DeleteLastCommandFile();
1840 }
1841
Tao Bao33567772017-03-13 14:57:34 -07001842 // Only delete the stash if the update cannot be resumed, or it's a verification run and we
1843 // created the stash.
1844 if (params.isunresumable || (!params.canwrite && params.createdstash)) {
1845 DeleteStash(params.stashbase);
1846 }
1847
1848 if (failure_type != kNoCause && state->cause_code == kNoCause) {
1849 state->cause_code = failure_type;
1850 }
1851
1852 return StringValue(rc == 0 ? "t" : "");
Sami Tolvanen90221202014-12-09 16:39:47 +00001853}
1854
Tao Bao33567772017-03-13 14:57:34 -07001855/**
1856 * The transfer list is a text file containing commands to transfer data from one place to another
1857 * on the target partition. We parse it and execute the commands in order:
1858 *
1859 * zero [rangeset]
1860 * - Fill the indicated blocks with zeros.
1861 *
1862 * new [rangeset]
1863 * - Fill the blocks with data read from the new_data file.
1864 *
1865 * erase [rangeset]
1866 * - Mark the given blocks as empty.
1867 *
1868 * move <...>
1869 * bsdiff <patchstart> <patchlen> <...>
1870 * imgdiff <patchstart> <patchlen> <...>
1871 * - Read the source blocks, apply a patch (or not in the case of move), write result to target
1872 * blocks. bsdiff or imgdiff specifies the type of patch; move means no patch at all.
1873 *
1874 * See the comments in LoadSrcTgtVersion3() for a description of the <...> format.
1875 *
1876 * stash <stash_id> <src_range>
1877 * - Load the given source range and stash the data in the given slot of the stash table.
1878 *
1879 * free <stash_id>
1880 * - Free the given stash data.
1881 *
1882 * The creator of the transfer list will guarantee that no block is read (ie, used as the source for
1883 * a patch or move) after it has been written.
1884 *
1885 * The creator will guarantee that a given stash is loaded (with a stash command) before it's used
1886 * in a move/bsdiff/imgdiff command.
1887 *
1888 * Within one command the source and target ranges may overlap so in general we need to read the
1889 * entire source into memory before writing anything to the target blocks.
1890 *
1891 * All the patch data is concatenated into one patch_data file in the update package. It must be
1892 * stored uncompressed because we memory-map it in directly from the archive. (Since patches are
1893 * already compressed, we lose very little by not compressing their concatenation.)
1894 *
1895 * Commands that read data from the partition (i.e. move/bsdiff/imgdiff/stash) have one or more
1896 * additional hashes before the range parameters, which are used to check if the command has already
1897 * been completed and verify the integrity of the source data.
1898 */
Tianjie Xuc4447322017-03-06 14:44:59 -08001899Value* BlockImageVerifyFn(const char* name, State* state,
1900 const std::vector<std::unique_ptr<Expr>>& argv) {
Tao Baoc3901232018-05-21 16:05:56 -07001901 // Commands which are not allowed are set to nullptr to skip them completely.
1902 const CommandMap command_map{
1903 // clang-format off
1904 { Command::Type::BSDIFF, PerformCommandDiff },
1905 { Command::Type::ERASE, nullptr },
1906 { Command::Type::FREE, PerformCommandFree },
1907 { Command::Type::IMGDIFF, PerformCommandDiff },
1908 { Command::Type::MOVE, PerformCommandMove },
1909 { Command::Type::NEW, nullptr },
1910 { Command::Type::STASH, PerformCommandStash },
1911 { Command::Type::ZERO, nullptr },
1912 // clang-format on
1913 };
1914 CHECK_EQ(static_cast<size_t>(Command::Type::LAST), command_map.size());
Sami Tolvanen90221202014-12-09 16:39:47 +00001915
Tao Baoc3901232018-05-21 16:05:56 -07001916 // Perform a dry run without writing to test if an update can proceed.
1917 return PerformBlockImageUpdate(name, state, argv, command_map, true);
Sami Tolvanen90221202014-12-09 16:39:47 +00001918}
1919
Tianjie Xuc4447322017-03-06 14:44:59 -08001920Value* BlockImageUpdateFn(const char* name, State* state,
1921 const std::vector<std::unique_ptr<Expr>>& argv) {
Tao Baoc3901232018-05-21 16:05:56 -07001922 const CommandMap command_map{
1923 // clang-format off
1924 { Command::Type::BSDIFF, PerformCommandDiff },
1925 { Command::Type::ERASE, PerformCommandErase },
1926 { Command::Type::FREE, PerformCommandFree },
1927 { Command::Type::IMGDIFF, PerformCommandDiff },
1928 { Command::Type::MOVE, PerformCommandMove },
1929 { Command::Type::NEW, PerformCommandNew },
1930 { Command::Type::STASH, PerformCommandStash },
1931 { Command::Type::ZERO, PerformCommandZero },
1932 // clang-format on
1933 };
1934 CHECK_EQ(static_cast<size_t>(Command::Type::LAST), command_map.size());
Sami Tolvanen90221202014-12-09 16:39:47 +00001935
Tao Baoc3901232018-05-21 16:05:56 -07001936 return PerformBlockImageUpdate(name, state, argv, command_map, false);
Doug Zongkerbc7ffed2014-08-15 14:31:52 -07001937}
1938
Tianjie Xuc4447322017-03-06 14:44:59 -08001939Value* RangeSha1Fn(const char* name, State* state, const std::vector<std::unique_ptr<Expr>>& argv) {
Tao Baoc97edcb2017-03-31 01:18:13 -07001940 if (argv.size() != 2) {
1941 ErrorAbort(state, kArgsParsingFailure, "range_sha1 expects 2 arguments, got %zu", argv.size());
1942 return StringValue("");
1943 }
1944
1945 std::vector<std::unique_ptr<Value>> args;
1946 if (!ReadValueArgs(state, argv, &args)) {
1947 return nullptr;
1948 }
1949
1950 const std::unique_ptr<Value>& blockdev_filename = args[0];
1951 const std::unique_ptr<Value>& ranges = args[1];
1952
1953 if (blockdev_filename->type != VAL_STRING) {
1954 ErrorAbort(state, kArgsParsingFailure, "blockdev_filename argument to %s must be string", name);
1955 return StringValue("");
1956 }
1957 if (ranges->type != VAL_STRING) {
1958 ErrorAbort(state, kArgsParsingFailure, "ranges argument to %s must be string", name);
1959 return StringValue("");
1960 }
1961
1962 android::base::unique_fd fd(ota_open(blockdev_filename->data.c_str(), O_RDWR));
1963 if (fd == -1) {
1964 ErrorAbort(state, kFileOpenFailure, "open \"%s\" failed: %s", blockdev_filename->data.c_str(),
1965 strerror(errno));
1966 return StringValue("");
1967 }
1968
1969 RangeSet rs = RangeSet::Parse(ranges->data);
Tao Bao67983152017-11-04 00:08:08 -07001970 CHECK(static_cast<bool>(rs));
Tao Baoc97edcb2017-03-31 01:18:13 -07001971
1972 SHA_CTX ctx;
1973 SHA1_Init(&ctx);
1974
1975 std::vector<uint8_t> buffer(BLOCKSIZE);
Tao Baobf5b77d2017-03-30 16:57:29 -07001976 for (const auto& range : rs) {
1977 if (!check_lseek(fd, static_cast<off64_t>(range.first) * BLOCKSIZE, SEEK_SET)) {
Tao Baoc97edcb2017-03-31 01:18:13 -07001978 ErrorAbort(state, kLseekFailure, "failed to seek %s: %s", blockdev_filename->data.c_str(),
1979 strerror(errno));
1980 return StringValue("");
1981 }
1982
Tao Baobf5b77d2017-03-30 16:57:29 -07001983 for (size_t j = range.first; j < range.second; ++j) {
Tao Baoc97edcb2017-03-31 01:18:13 -07001984 if (read_all(fd, buffer, BLOCKSIZE) == -1) {
1985 ErrorAbort(state, kFreadFailure, "failed to read %s: %s", blockdev_filename->data.c_str(),
1986 strerror(errno));
Tianjie Xuc4447322017-03-06 14:44:59 -08001987 return StringValue("");
Tao Baoc97edcb2017-03-31 01:18:13 -07001988 }
1989
1990 SHA1_Update(&ctx, buffer.data(), BLOCKSIZE);
Tianjie Xuc4447322017-03-06 14:44:59 -08001991 }
Tao Baoc97edcb2017-03-31 01:18:13 -07001992 }
1993 uint8_t digest[SHA_DIGEST_LENGTH];
1994 SHA1_Final(digest, &ctx);
Tianjie Xuc4447322017-03-06 14:44:59 -08001995
Tao Baoc97edcb2017-03-31 01:18:13 -07001996 return StringValue(print_sha1(digest));
Doug Zongkerbc7ffed2014-08-15 14:31:52 -07001997}
1998
Tianjie Xu57bed6d2015-12-15 11:47:30 -08001999// This function checks if a device has been remounted R/W prior to an incremental
2000// OTA update. This is an common cause of update abortion. The function reads the
2001// 1st block of each partition and check for mounting time/count. It return string "t"
2002// if executes successfully and an empty string otherwise.
2003
Tianjie Xuc4447322017-03-06 14:44:59 -08002004Value* CheckFirstBlockFn(const char* name, State* state,
2005 const std::vector<std::unique_ptr<Expr>>& argv) {
Tao Baoc97edcb2017-03-31 01:18:13 -07002006 if (argv.size() != 1) {
2007 ErrorAbort(state, kArgsParsingFailure, "check_first_block expects 1 argument, got %zu",
2008 argv.size());
2009 return StringValue("");
2010 }
Tianjie Xuc4447322017-03-06 14:44:59 -08002011
Tao Baoc97edcb2017-03-31 01:18:13 -07002012 std::vector<std::unique_ptr<Value>> args;
2013 if (!ReadValueArgs(state, argv, &args)) {
2014 return nullptr;
2015 }
Tianjie Xu57bed6d2015-12-15 11:47:30 -08002016
Tao Baoc97edcb2017-03-31 01:18:13 -07002017 const std::unique_ptr<Value>& arg_filename = args[0];
Tianjie Xu5fe280a2016-10-17 18:15:20 -07002018
Tao Baoc97edcb2017-03-31 01:18:13 -07002019 if (arg_filename->type != VAL_STRING) {
2020 ErrorAbort(state, kArgsParsingFailure, "filename argument to %s must be string", name);
2021 return StringValue("");
2022 }
Tianjie Xu57bed6d2015-12-15 11:47:30 -08002023
Tao Baoc97edcb2017-03-31 01:18:13 -07002024 android::base::unique_fd fd(ota_open(arg_filename->data.c_str(), O_RDONLY));
2025 if (fd == -1) {
2026 ErrorAbort(state, kFileOpenFailure, "open \"%s\" failed: %s", arg_filename->data.c_str(),
2027 strerror(errno));
2028 return StringValue("");
2029 }
Tianjie Xu57bed6d2015-12-15 11:47:30 -08002030
Tao Baobf5b77d2017-03-30 16:57:29 -07002031 RangeSet blk0(std::vector<Range>{ Range{ 0, 1 } });
Tao Baoc97edcb2017-03-31 01:18:13 -07002032 std::vector<uint8_t> block0_buffer(BLOCKSIZE);
Tianjie Xu57bed6d2015-12-15 11:47:30 -08002033
Tao Baoc97edcb2017-03-31 01:18:13 -07002034 if (ReadBlocks(blk0, block0_buffer, fd) == -1) {
2035 ErrorAbort(state, kFreadFailure, "failed to read %s: %s", arg_filename->data.c_str(),
2036 strerror(errno));
2037 return StringValue("");
2038 }
Tianjie Xu57bed6d2015-12-15 11:47:30 -08002039
Tao Baoc97edcb2017-03-31 01:18:13 -07002040 // https://ext4.wiki.kernel.org/index.php/Ext4_Disk_Layout
2041 // Super block starts from block 0, offset 0x400
2042 // 0x2C: len32 Mount time
2043 // 0x30: len32 Write time
2044 // 0x34: len16 Number of mounts since the last fsck
2045 // 0x38: len16 Magic signature 0xEF53
Tianjie Xu57bed6d2015-12-15 11:47:30 -08002046
Tao Baoc97edcb2017-03-31 01:18:13 -07002047 time_t mount_time = *reinterpret_cast<uint32_t*>(&block0_buffer[0x400 + 0x2C]);
2048 uint16_t mount_count = *reinterpret_cast<uint16_t*>(&block0_buffer[0x400 + 0x34]);
Tianjie Xu57bed6d2015-12-15 11:47:30 -08002049
Tao Baoc97edcb2017-03-31 01:18:13 -07002050 if (mount_count > 0) {
2051 uiPrintf(state, "Device was remounted R/W %" PRIu16 " times", mount_count);
2052 uiPrintf(state, "Last remount happened on %s", ctime(&mount_time));
2053 }
Tianjie Xu57bed6d2015-12-15 11:47:30 -08002054
Tao Baoc97edcb2017-03-31 01:18:13 -07002055 return StringValue("t");
Tianjie Xu57bed6d2015-12-15 11:47:30 -08002056}
2057
Tianjie Xuc4447322017-03-06 14:44:59 -08002058Value* BlockImageRecoverFn(const char* name, State* state,
2059 const std::vector<std::unique_ptr<Expr>>& argv) {
Tao Baoc97edcb2017-03-31 01:18:13 -07002060 if (argv.size() != 2) {
2061 ErrorAbort(state, kArgsParsingFailure, "block_image_recover expects 2 arguments, got %zu",
2062 argv.size());
2063 return StringValue("");
2064 }
2065
2066 std::vector<std::unique_ptr<Value>> args;
2067 if (!ReadValueArgs(state, argv, &args)) {
2068 return nullptr;
2069 }
2070
2071 const std::unique_ptr<Value>& filename = args[0];
2072 const std::unique_ptr<Value>& ranges = args[1];
2073
2074 if (filename->type != VAL_STRING) {
2075 ErrorAbort(state, kArgsParsingFailure, "filename argument to %s must be string", name);
2076 return StringValue("");
2077 }
2078 if (ranges->type != VAL_STRING) {
2079 ErrorAbort(state, kArgsParsingFailure, "ranges argument to %s must be string", name);
2080 return StringValue("");
2081 }
Tao Bao67983152017-11-04 00:08:08 -07002082 RangeSet rs = RangeSet::Parse(ranges->data);
2083 if (!rs) {
2084 ErrorAbort(state, kArgsParsingFailure, "failed to parse ranges: %s", ranges->data.c_str());
2085 return StringValue("");
2086 }
Tao Baoc97edcb2017-03-31 01:18:13 -07002087
2088 // Output notice to log when recover is attempted
2089 LOG(INFO) << filename->data << " image corrupted, attempting to recover...";
2090
2091 // When opened with O_RDWR, libfec rewrites corrupted blocks when they are read
2092 fec::io fh(filename->data, O_RDWR);
2093
2094 if (!fh) {
2095 ErrorAbort(state, kLibfecFailure, "fec_open \"%s\" failed: %s", filename->data.c_str(),
2096 strerror(errno));
2097 return StringValue("");
2098 }
2099
2100 if (!fh.has_ecc() || !fh.has_verity()) {
2101 ErrorAbort(state, kLibfecFailure, "unable to use metadata to correct errors");
2102 return StringValue("");
2103 }
2104
2105 fec_status status;
Tao Baoc97edcb2017-03-31 01:18:13 -07002106 if (!fh.get_status(status)) {
2107 ErrorAbort(state, kLibfecFailure, "failed to read FEC status");
2108 return StringValue("");
2109 }
2110
Tao Baoc97edcb2017-03-31 01:18:13 -07002111 uint8_t buffer[BLOCKSIZE];
Tao Bao67983152017-11-04 00:08:08 -07002112 for (const auto& range : rs) {
Tao Baobf5b77d2017-03-30 16:57:29 -07002113 for (size_t j = range.first; j < range.second; ++j) {
Tao Baoc97edcb2017-03-31 01:18:13 -07002114 // Stay within the data area, libfec validates and corrects metadata
Tao Baobf5b77d2017-03-30 16:57:29 -07002115 if (status.data_size <= static_cast<uint64_t>(j) * BLOCKSIZE) {
Tao Baoc97edcb2017-03-31 01:18:13 -07002116 continue;
2117 }
2118
Tao Baobf5b77d2017-03-30 16:57:29 -07002119 if (fh.pread(buffer, BLOCKSIZE, static_cast<off64_t>(j) * BLOCKSIZE) != BLOCKSIZE) {
Tao Baoc97edcb2017-03-31 01:18:13 -07002120 ErrorAbort(state, kLibfecFailure, "failed to recover %s (block %zu): %s",
2121 filename->data.c_str(), j, strerror(errno));
Tianjie Xuc4447322017-03-06 14:44:59 -08002122 return StringValue("");
Tao Baoc97edcb2017-03-31 01:18:13 -07002123 }
2124
2125 // If we want to be able to recover from a situation where rewriting a corrected
2126 // block doesn't guarantee the same data will be returned when re-read later, we
2127 // can save a copy of corrected blocks to /cache. Note:
2128 //
2129 // 1. Maximum space required from /cache is the same as the maximum number of
2130 // corrupted blocks we can correct. For RS(255, 253) and a 2 GiB partition,
2131 // this would be ~16 MiB, for example.
2132 //
2133 // 2. To find out if this block was corrupted, call fec_get_status after each
2134 // read and check if the errors field value has increased.
Tianjie Xuc4447322017-03-06 14:44:59 -08002135 }
Tao Baoc97edcb2017-03-31 01:18:13 -07002136 }
2137 LOG(INFO) << "..." << filename->data << " image recovered successfully.";
2138 return StringValue("t");
Sami Tolvanen0a7b4732015-06-25 10:25:36 +01002139}
2140
Doug Zongkerbc7ffed2014-08-15 14:31:52 -07002141void RegisterBlockImageFunctions() {
Tao Baoc97edcb2017-03-31 01:18:13 -07002142 RegisterFunction("block_image_verify", BlockImageVerifyFn);
2143 RegisterFunction("block_image_update", BlockImageUpdateFn);
2144 RegisterFunction("block_image_recover", BlockImageRecoverFn);
2145 RegisterFunction("check_first_block", CheckFirstBlockFn);
2146 RegisterFunction("range_sha1", RangeSha1Fn);
Doug Zongkerbc7ffed2014-08-15 14:31:52 -07002147}