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Doug Zongker512536a2010-02-17 16:11:44 -08001/*
2 * Copyright (C) 2008 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
Tao Bao8fce75a2016-11-10 12:33:41 -080017#include "applypatch/applypatch.h"
18
Doug Zongker512536a2010-02-17 16:11:44 -080019#include <errno.h>
Tao Baoba9a42a2015-06-23 23:23:33 -070020#include <fcntl.h>
Doug Zongker512536a2010-02-17 16:11:44 -080021#include <libgen.h>
22#include <stdio.h>
23#include <stdlib.h>
24#include <string.h>
25#include <sys/stat.h>
26#include <sys/statfs.h>
27#include <sys/types.h>
Doug Zongker512536a2010-02-17 16:11:44 -080028#include <unistd.h>
29
Tao Baoc0e1c462017-02-01 10:20:10 -080030#include <functional>
Yabin Cuid483c202016-02-03 17:08:52 -080031#include <memory>
32#include <string>
Tao Bao8fce75a2016-11-10 12:33:41 -080033#include <utility>
34#include <vector>
Yabin Cuid483c202016-02-03 17:08:52 -080035
Tao Bao40e144d2017-03-15 01:10:58 -070036#include <android-base/logging.h>
Tao Bao8fce75a2016-11-10 12:33:41 -080037#include <android-base/parseint.h>
Elliott Hughes4b166f02015-12-04 15:30:20 -080038#include <android-base/strings.h>
Tao Bao8fce75a2016-11-10 12:33:41 -080039#include <openssl/sha.h>
Tao Baoaca8e892015-07-17 11:47:44 -070040
Doug Zongkerc4351c72010-02-22 14:46:32 -080041#include "edify/expr.h"
Tao Baod33b2f82017-09-28 21:29:11 -070042#include "otafault/ota_io.h"
Tao Bao09e468f2017-09-29 14:39:33 -070043#include "otautil/print_sha1.h"
Doug Zongker512536a2010-02-17 16:11:44 -080044
Tao Bao8fce75a2016-11-10 12:33:41 -080045static int LoadPartitionContents(const std::string& filename, FileContents* file);
Tao Baoc0e1c462017-02-01 10:20:10 -080046static size_t FileSink(const unsigned char* data, size_t len, int fd);
Tao Bao40e144d2017-03-15 01:10:58 -070047static int GenerateTarget(const FileContents& source_file, const std::unique_ptr<Value>& patch,
48 const std::string& target_filename,
49 const uint8_t target_sha1[SHA_DIGEST_LENGTH], const Value* bonus_data);
Doug Zongker512536a2010-02-17 16:11:44 -080050
Tao Bao8fce75a2016-11-10 12:33:41 -080051// Read a file into memory; store the file contents and associated metadata in *file.
Hristo Bojinovdb314d62010-08-02 10:29:49 -070052// Return 0 on success.
Doug Zongkera1bc1482014-02-13 15:18:19 -080053int LoadFileContents(const char* filename, FileContents* file) {
Tao Bao8fce75a2016-11-10 12:33:41 -080054 // A special 'filename' beginning with "EMMC:" means to load the contents of a partition.
55 if (strncmp(filename, "EMMC:", 5) == 0) {
56 return LoadPartitionContents(filename, file);
57 }
Doug Zongker512536a2010-02-17 16:11:44 -080058
Tao Bao8fce75a2016-11-10 12:33:41 -080059 if (stat(filename, &file->st) == -1) {
60 printf("failed to stat \"%s\": %s\n", filename, strerror(errno));
61 return -1;
62 }
Doug Zongkerc4351c72010-02-22 14:46:32 -080063
Tao Bao8fce75a2016-11-10 12:33:41 -080064 std::vector<unsigned char> data(file->st.st_size);
Tao Bao358c2ec2016-11-28 11:48:43 -080065 unique_file f(ota_fopen(filename, "rb"));
Tao Bao8fce75a2016-11-10 12:33:41 -080066 if (!f) {
67 printf("failed to open \"%s\": %s\n", filename, strerror(errno));
68 return -1;
69 }
Doug Zongkerc4351c72010-02-22 14:46:32 -080070
Tao Bao8fce75a2016-11-10 12:33:41 -080071 size_t bytes_read = ota_fread(data.data(), 1, data.size(), f.get());
72 if (bytes_read != data.size()) {
73 printf("short read of \"%s\" (%zu bytes of %zu)\n", filename, bytes_read, data.size());
74 return -1;
75 }
76 file->data = std::move(data);
77 SHA1(file->data.data(), file->data.size(), file->sha1);
78 return 0;
Doug Zongker512536a2010-02-17 16:11:44 -080079}
80
Elliott Hughes63a31922016-06-09 17:41:22 -070081// Load the contents of an EMMC partition into the provided
Doug Zongker512536a2010-02-17 16:11:44 -080082// FileContents. filename should be a string of the form
Elliott Hughes63a31922016-06-09 17:41:22 -070083// "EMMC:<partition_device>:...". The smallest size_n bytes for
Doug Zongkerf291d852010-07-07 13:55:25 -070084// which that prefix of the partition contents has the corresponding
85// sha1 hash will be loaded. It is acceptable for a size value to be
86// repeated with different sha1s. Will return 0 on success.
Doug Zongker512536a2010-02-17 16:11:44 -080087//
88// This complexity is needed because if an OTA installation is
89// interrupted, the partition might contain either the source or the
90// target data, which might be of different lengths. We need to know
Doug Zongkerf291d852010-07-07 13:55:25 -070091// the length in order to read from a partition (there is no
92// "end-of-file" marker), so the caller must specify the possible
93// lengths and the hash of the data, and we'll do the load expecting
94// to find one of those hashes.
Tao Bao8fce75a2016-11-10 12:33:41 -080095static int LoadPartitionContents(const std::string& filename, FileContents* file) {
96 std::vector<std::string> pieces = android::base::Split(filename, ":");
97 if (pieces.size() < 4 || pieces.size() % 2 != 0 || pieces[0] != "EMMC") {
98 printf("LoadPartitionContents called with bad filename \"%s\"\n", filename.c_str());
99 return -1;
100 }
101
102 size_t pair_count = (pieces.size() - 2) / 2; // # of (size, sha1) pairs in filename
103 std::vector<std::pair<size_t, std::string>> pairs;
104 for (size_t i = 0; i < pair_count; ++i) {
105 size_t size;
106 if (!android::base::ParseUint(pieces[i * 2 + 2], &size) || size == 0) {
107 printf("LoadPartitionContents called with bad size \"%s\"\n", pieces[i * 2 + 2].c_str());
108 return -1;
109 }
110 pairs.push_back({ size, pieces[i * 2 + 3] });
111 }
112
113 // Sort the pairs array so that they are in order of increasing size.
114 std::sort(pairs.begin(), pairs.end());
115
116 const char* partition = pieces[1].c_str();
Tao Bao358c2ec2016-11-28 11:48:43 -0800117 unique_file dev(ota_fopen(partition, "rb"));
Tao Bao8fce75a2016-11-10 12:33:41 -0800118 if (!dev) {
119 printf("failed to open emmc partition \"%s\": %s\n", partition, strerror(errno));
120 return -1;
121 }
122
123 SHA_CTX sha_ctx;
124 SHA1_Init(&sha_ctx);
125
126 // Allocate enough memory to hold the largest size.
127 std::vector<unsigned char> buffer(pairs[pair_count - 1].first);
128 unsigned char* buffer_ptr = buffer.data();
129 size_t buffer_size = 0; // # bytes read so far
130 bool found = false;
131
132 for (const auto& pair : pairs) {
133 size_t current_size = pair.first;
134 const std::string& current_sha1 = pair.second;
135
136 // Read enough additional bytes to get us up to the next size. (Again,
137 // we're trying the possibilities in order of increasing size).
138 size_t next = current_size - buffer_size;
139 if (next > 0) {
140 size_t read = ota_fread(buffer_ptr, 1, next, dev.get());
141 if (next != read) {
142 printf("short read (%zu bytes of %zu) for partition \"%s\"\n", read, next, partition);
Tao Baoaca8e892015-07-17 11:47:44 -0700143 return -1;
Tao Bao8fce75a2016-11-10 12:33:41 -0800144 }
145 SHA1_Update(&sha_ctx, buffer_ptr, read);
146 buffer_size += read;
147 buffer_ptr += read;
Tao Baoaca8e892015-07-17 11:47:44 -0700148 }
Doug Zongkerf291d852010-07-07 13:55:25 -0700149
Tao Bao8fce75a2016-11-10 12:33:41 -0800150 // Duplicate the SHA context and finalize the duplicate so we can
151 // check it against this pair's expected hash.
152 SHA_CTX temp_ctx;
153 memcpy(&temp_ctx, &sha_ctx, sizeof(SHA_CTX));
154 uint8_t sha_so_far[SHA_DIGEST_LENGTH];
155 SHA1_Final(sha_so_far, &temp_ctx);
Doug Zongker512536a2010-02-17 16:11:44 -0800156
Sen Jiangc48cb5e2016-02-04 16:23:21 +0800157 uint8_t parsed_sha[SHA_DIGEST_LENGTH];
Tao Bao8fce75a2016-11-10 12:33:41 -0800158 if (ParseSha1(current_sha1.c_str(), parsed_sha) != 0) {
159 printf("failed to parse SHA-1 %s in %s\n", current_sha1.c_str(), filename.c_str());
160 return -1;
Doug Zongkerc4351c72010-02-22 14:46:32 -0800161 }
162
Tao Bao8fce75a2016-11-10 12:33:41 -0800163 if (memcmp(sha_so_far, parsed_sha, SHA_DIGEST_LENGTH) == 0) {
164 // We have a match. Stop reading the partition; we'll return the data we've read so far.
165 printf("partition read matched size %zu SHA-1 %s\n", current_size, current_sha1.c_str());
166 found = true;
167 break;
Doug Zongker512536a2010-02-17 16:11:44 -0800168 }
Tao Bao8fce75a2016-11-10 12:33:41 -0800169 }
Doug Zongker512536a2010-02-17 16:11:44 -0800170
Tao Bao8fce75a2016-11-10 12:33:41 -0800171 if (!found) {
172 // Ran off the end of the list of (size, sha1) pairs without finding a match.
173 printf("contents of partition \"%s\" didn't match %s\n", partition, filename.c_str());
174 return -1;
175 }
Doug Zongker512536a2010-02-17 16:11:44 -0800176
Tao Bao8fce75a2016-11-10 12:33:41 -0800177 SHA1_Final(file->sha1, &sha_ctx);
Doug Zongker512536a2010-02-17 16:11:44 -0800178
Tao Bao8fce75a2016-11-10 12:33:41 -0800179 buffer.resize(buffer_size);
180 file->data = std::move(buffer);
181 // Fake some stat() info.
182 file->st.st_mode = 0644;
183 file->st.st_uid = 0;
184 file->st.st_gid = 0;
185
186 return 0;
Doug Zongker512536a2010-02-17 16:11:44 -0800187}
188
Doug Zongker512536a2010-02-17 16:11:44 -0800189// Save the contents of the given FileContents object under the given
190// filename. Return 0 on success.
Doug Zongker1c43c972012-02-28 11:07:09 -0800191int SaveFileContents(const char* filename, const FileContents* file) {
Tao Bao6e02ea92016-11-17 11:24:07 -0800192 unique_fd fd(ota_open(filename, O_WRONLY | O_CREAT | O_TRUNC | O_SYNC, S_IRUSR | S_IWUSR));
193 if (fd == -1) {
194 printf("failed to open \"%s\" for write: %s\n", filename, strerror(errno));
195 return -1;
196 }
Doug Zongker512536a2010-02-17 16:11:44 -0800197
Tao Baoc0e1c462017-02-01 10:20:10 -0800198 size_t bytes_written = FileSink(file->data.data(), file->data.size(), fd);
Tao Baof7eb7602017-03-27 15:12:48 -0700199 if (bytes_written != file->data.size()) {
Tao Bao6e02ea92016-11-17 11:24:07 -0800200 printf("short write of \"%s\" (%zd bytes of %zu): %s\n", filename, bytes_written,
201 file->data.size(), strerror(errno));
202 return -1;
203 }
204 if (ota_fsync(fd) != 0) {
205 printf("fsync of \"%s\" failed: %s\n", filename, strerror(errno));
206 return -1;
207 }
Tao Bao3dc14cb2016-11-22 11:37:13 -0800208 if (ota_close(fd) != 0) {
Tao Bao6e02ea92016-11-17 11:24:07 -0800209 printf("close of \"%s\" failed: %s\n", filename, strerror(errno));
210 return -1;
211 }
Doug Zongker512536a2010-02-17 16:11:44 -0800212
Tao Bao6e02ea92016-11-17 11:24:07 -0800213 if (chmod(filename, file->st.st_mode) != 0) {
214 printf("chmod of \"%s\" failed: %s\n", filename, strerror(errno));
215 return -1;
216 }
217 if (chown(filename, file->st.st_uid, file->st.st_gid) != 0) {
218 printf("chown of \"%s\" failed: %s\n", filename, strerror(errno));
219 return -1;
220 }
Doug Zongker512536a2010-02-17 16:11:44 -0800221
Tao Bao6e02ea92016-11-17 11:24:07 -0800222 return 0;
Doug Zongker512536a2010-02-17 16:11:44 -0800223}
224
Doug Zongkerf291d852010-07-07 13:55:25 -0700225// Write a memory buffer to 'target' partition, a string of the form
Elliott Hughes63a31922016-06-09 17:41:22 -0700226// "EMMC:<partition_device>[:...]". The target name
Tao Bao1ce7a2a2015-07-24 15:29:12 -0700227// might contain multiple colons, but WriteToPartition() only uses the first
228// two and ignores the rest. Return 0 on success.
Tao Bao6e02ea92016-11-17 11:24:07 -0800229int WriteToPartition(const unsigned char* data, size_t len, const std::string& target) {
230 std::vector<std::string> pieces = android::base::Split(target, ":");
Tao Bao8fce75a2016-11-10 12:33:41 -0800231 if (pieces.size() < 2 || pieces[0] != "EMMC") {
Tao Bao6e02ea92016-11-17 11:24:07 -0800232 printf("WriteToPartition called with bad target (%s)\n", target.c_str());
Tao Bao8fce75a2016-11-10 12:33:41 -0800233 return -1;
234 }
235
236 const char* partition = pieces[1].c_str();
Tao Bao6e02ea92016-11-17 11:24:07 -0800237 unique_fd fd(ota_open(partition, O_RDWR));
238 if (fd == -1) {
Tao Bao8fce75a2016-11-10 12:33:41 -0800239 printf("failed to open %s: %s\n", partition, strerror(errno));
240 return -1;
241 }
242
Tao Bao6e02ea92016-11-17 11:24:07 -0800243 size_t start = 0;
244 bool success = false;
Tao Bao8fce75a2016-11-10 12:33:41 -0800245 for (size_t attempt = 0; attempt < 2; ++attempt) {
246 if (TEMP_FAILURE_RETRY(lseek(fd, start, SEEK_SET)) == -1) {
247 printf("failed seek on %s: %s\n", partition, strerror(errno));
248 return -1;
249 }
250 while (start < len) {
251 size_t to_write = len - start;
252 if (to_write > 1 << 20) to_write = 1 << 20;
253
254 ssize_t written = TEMP_FAILURE_RETRY(ota_write(fd, data + start, to_write));
255 if (written == -1) {
256 printf("failed write writing to %s: %s\n", partition, strerror(errno));
Tao Baoaca8e892015-07-17 11:47:44 -0700257 return -1;
Tao Bao8fce75a2016-11-10 12:33:41 -0800258 }
259 start += written;
Tao Baoaca8e892015-07-17 11:47:44 -0700260 }
Doug Zongkerf291d852010-07-07 13:55:25 -0700261
Tao Bao8fce75a2016-11-10 12:33:41 -0800262 if (ota_fsync(fd) != 0) {
Tao Bao6e02ea92016-11-17 11:24:07 -0800263 printf("failed to sync to %s: %s\n", partition, strerror(errno));
Tao Bao8fce75a2016-11-10 12:33:41 -0800264 return -1;
Doug Zongkerf291d852010-07-07 13:55:25 -0700265 }
Tao Bao3dc14cb2016-11-22 11:37:13 -0800266 if (ota_close(fd) != 0) {
Tao Bao6e02ea92016-11-17 11:24:07 -0800267 printf("failed to close %s: %s\n", partition, strerror(errno));
Tao Bao8fce75a2016-11-10 12:33:41 -0800268 return -1;
Elliott Hughes63a31922016-06-09 17:41:22 -0700269 }
Tao Bao8fce75a2016-11-10 12:33:41 -0800270
Tao Bao6e02ea92016-11-17 11:24:07 -0800271 fd.reset(ota_open(partition, O_RDONLY));
272 if (fd == -1) {
273 printf("failed to reopen %s for verify: %s\n", partition, strerror(errno));
Tao Bao8fce75a2016-11-10 12:33:41 -0800274 return -1;
275 }
276
277 // Drop caches so our subsequent verification read won't just be reading the cache.
Elliott Hughes63a31922016-06-09 17:41:22 -0700278 sync();
Tao Bao6e02ea92016-11-17 11:24:07 -0800279 unique_fd dc(ota_open("/proc/sys/vm/drop_caches", O_WRONLY));
Tao Bao8fce75a2016-11-10 12:33:41 -0800280 if (TEMP_FAILURE_RETRY(ota_write(dc, "3\n", 2)) == -1) {
281 printf("write to /proc/sys/vm/drop_caches failed: %s\n", strerror(errno));
282 } else {
283 printf(" caches dropped\n");
284 }
Tao Bao3dc14cb2016-11-22 11:37:13 -0800285 ota_close(dc);
Tao Bao8fce75a2016-11-10 12:33:41 -0800286 sleep(1);
Elliott Hughes63a31922016-06-09 17:41:22 -0700287
Tao Bao6e02ea92016-11-17 11:24:07 -0800288 // Verify.
Tao Bao8fce75a2016-11-10 12:33:41 -0800289 if (TEMP_FAILURE_RETRY(lseek(fd, 0, SEEK_SET)) == -1) {
290 printf("failed to seek back to beginning of %s: %s\n", partition, strerror(errno));
291 return -1;
292 }
293
294 unsigned char buffer[4096];
295 start = len;
296 for (size_t p = 0; p < len; p += sizeof(buffer)) {
297 size_t to_read = len - p;
298 if (to_read > sizeof(buffer)) {
299 to_read = sizeof(buffer);
300 }
301
302 size_t so_far = 0;
303 while (so_far < to_read) {
304 ssize_t read_count = TEMP_FAILURE_RETRY(ota_read(fd, buffer + so_far, to_read - so_far));
305 if (read_count == -1) {
306 printf("verify read error %s at %zu: %s\n", partition, p, strerror(errno));
307 return -1;
308 } else if (read_count == 0) {
309 printf("verify read reached unexpected EOF, %s at %zu\n", partition, p);
310 return -1;
311 }
312 if (static_cast<size_t>(read_count) < to_read) {
Tao Bao6e02ea92016-11-17 11:24:07 -0800313 printf("short verify read %s at %zu: %zd %zu\n", partition, p, read_count, to_read);
Tao Bao8fce75a2016-11-10 12:33:41 -0800314 }
315 so_far += read_count;
316 }
317
318 if (memcmp(buffer, data + p, to_read) != 0) {
319 printf("verification failed starting at %zu\n", p);
320 start = p;
321 break;
322 }
323 }
324
325 if (start == len) {
326 printf("verification read succeeded (attempt %zu)\n", attempt + 1);
327 success = true;
328 break;
329 }
katao9a6f5202016-12-19 11:22:30 +0800330
331 if (ota_close(fd) != 0) {
332 printf("failed to close %s: %s\n", partition, strerror(errno));
333 return -1;
334 }
335
336 fd.reset(ota_open(partition, O_RDWR));
337 if (fd == -1) {
338 printf("failed to reopen %s for retry write && verify: %s\n", partition, strerror(errno));
339 return -1;
340 }
Tao Bao8fce75a2016-11-10 12:33:41 -0800341 }
342
343 if (!success) {
344 printf("failed to verify after all attempts\n");
345 return -1;
346 }
347
Tao Bao3dc14cb2016-11-22 11:37:13 -0800348 if (ota_close(fd) == -1) {
Tao Bao6e02ea92016-11-17 11:24:07 -0800349 printf("error closing %s: %s\n", partition, strerror(errno));
Tao Bao8fce75a2016-11-10 12:33:41 -0800350 return -1;
351 }
352 sync();
353
354 return 0;
Doug Zongker512536a2010-02-17 16:11:44 -0800355}
356
Doug Zongker512536a2010-02-17 16:11:44 -0800357// Take a string 'str' of 40 hex digits and parse it into the 20
358// byte array 'digest'. 'str' may contain only the digest or be of
359// the form "<digest>:<anything>". Return 0 on success, -1 on any
360// error.
361int ParseSha1(const char* str, uint8_t* digest) {
Doug Zongkerc4351c72010-02-22 14:46:32 -0800362 const char* ps = str;
363 uint8_t* pd = digest;
Sen Jiangc48cb5e2016-02-04 16:23:21 +0800364 for (int i = 0; i < SHA_DIGEST_LENGTH * 2; ++i, ++ps) {
Doug Zongkerc4351c72010-02-22 14:46:32 -0800365 int digit;
366 if (*ps >= '0' && *ps <= '9') {
367 digit = *ps - '0';
368 } else if (*ps >= 'a' && *ps <= 'f') {
369 digit = *ps - 'a' + 10;
370 } else if (*ps >= 'A' && *ps <= 'F') {
371 digit = *ps - 'A' + 10;
372 } else {
373 return -1;
374 }
375 if (i % 2 == 0) {
376 *pd = digit << 4;
377 } else {
378 *pd |= digit;
379 ++pd;
380 }
Doug Zongker512536a2010-02-17 16:11:44 -0800381 }
Doug Zongkerc4351c72010-02-22 14:46:32 -0800382 if (*ps != '\0') return -1;
383 return 0;
Doug Zongker512536a2010-02-17 16:11:44 -0800384}
385
Doug Zongkerc4351c72010-02-22 14:46:32 -0800386// Search an array of sha1 strings for one matching the given sha1.
387// Return the index of the match on success, or -1 if no match is
388// found.
Tao Baoc8e79342016-12-28 10:11:22 -0800389static int FindMatchingPatch(uint8_t* sha1, const std::vector<std::string>& patch_sha1_str) {
Tao Bao8fce75a2016-11-10 12:33:41 -0800390 for (size_t i = 0; i < patch_sha1_str.size(); ++i) {
391 uint8_t patch_sha1[SHA_DIGEST_LENGTH];
392 if (ParseSha1(patch_sha1_str[i].c_str(), patch_sha1) == 0 &&
393 memcmp(patch_sha1, sha1, SHA_DIGEST_LENGTH) == 0) {
394 return i;
Doug Zongker512536a2010-02-17 16:11:44 -0800395 }
Tao Bao8fce75a2016-11-10 12:33:41 -0800396 }
397 return -1;
Doug Zongker512536a2010-02-17 16:11:44 -0800398}
399
400// Returns 0 if the contents of the file (argv[2]) or the cached file
401// match any of the sha1's on the command line (argv[3:]). Returns
402// nonzero otherwise.
Tianjie Xuaced5d92016-10-12 10:55:04 -0700403int applypatch_check(const char* filename, const std::vector<std::string>& patch_sha1_str) {
Tao Bao8fce75a2016-11-10 12:33:41 -0800404 FileContents file;
Doug Zongker512536a2010-02-17 16:11:44 -0800405
Tao Bao8fce75a2016-11-10 12:33:41 -0800406 // It's okay to specify no sha1s; the check will pass if the
407 // LoadFileContents is successful. (Useful for reading
408 // partitions, where the filename encodes the sha1s; no need to
409 // check them twice.)
410 if (LoadFileContents(filename, &file) != 0 ||
411 (!patch_sha1_str.empty() && FindMatchingPatch(file.sha1, patch_sha1_str) < 0)) {
412 printf("file \"%s\" doesn't have any of expected sha1 sums; checking cache\n", filename);
Doug Zongker512536a2010-02-17 16:11:44 -0800413
Tao Bao8fce75a2016-11-10 12:33:41 -0800414 // If the source file is missing or corrupted, it might be because
415 // we were killed in the middle of patching it. A copy of it
416 // should have been made in CACHE_TEMP_SOURCE. If that file
417 // exists and matches the sha1 we're looking for, the check still
418 // passes.
419 if (LoadFileContents(CACHE_TEMP_SOURCE, &file) != 0) {
420 printf("failed to load cache file\n");
421 return 1;
Doug Zongkerc4351c72010-02-22 14:46:32 -0800422 }
Tao Bao8fce75a2016-11-10 12:33:41 -0800423
424 if (FindMatchingPatch(file.sha1, patch_sha1_str) < 0) {
425 printf("cache bits don't match any sha1 for \"%s\"\n", filename);
426 return 1;
427 }
428 }
429 return 0;
Doug Zongker512536a2010-02-17 16:11:44 -0800430}
431
432int ShowLicenses() {
Doug Zongkerc4351c72010-02-22 14:46:32 -0800433 ShowBSDiffLicense();
434 return 0;
Doug Zongker512536a2010-02-17 16:11:44 -0800435}
436
Tao Baoc0e1c462017-02-01 10:20:10 -0800437static size_t FileSink(const unsigned char* data, size_t len, int fd) {
Tao Baof7eb7602017-03-27 15:12:48 -0700438 size_t done = 0;
439 while (done < len) {
440 ssize_t wrote = TEMP_FAILURE_RETRY(ota_write(fd, data + done, len - done));
441 if (wrote == -1) {
442 printf("error writing %zd bytes: %s\n", (len - done), strerror(errno));
443 return done;
Doug Zongker512536a2010-02-17 16:11:44 -0800444 }
Tao Baof7eb7602017-03-27 15:12:48 -0700445 done += wrote;
446 }
447 return done;
Doug Zongker512536a2010-02-17 16:11:44 -0800448}
449
Doug Zongker512536a2010-02-17 16:11:44 -0800450// Return the amount of free space (in bytes) on the filesystem
451// containing filename. filename must exist. Return -1 on error.
452size_t FreeSpaceForFile(const char* filename) {
Doug Zongkerc4351c72010-02-22 14:46:32 -0800453 struct statfs sf;
454 if (statfs(filename, &sf) != 0) {
455 printf("failed to statfs %s: %s\n", filename, strerror(errno));
456 return -1;
457 }
caozhiyuan3b497762015-05-19 17:21:00 +0800458 return sf.f_bsize * sf.f_bavail;
Doug Zongker512536a2010-02-17 16:11:44 -0800459}
460
Doug Zongkerc4351c72010-02-22 14:46:32 -0800461int CacheSizeCheck(size_t bytes) {
462 if (MakeFreeSpaceOnCache(bytes) < 0) {
Chih-Hung Hsieh54a27472016-04-18 11:30:55 -0700463 printf("unable to make %zu bytes available on /cache\n", bytes);
Doug Zongkerc4351c72010-02-22 14:46:32 -0800464 return 1;
465 } else {
466 return 0;
467 }
468}
469
Tao Bao40e144d2017-03-15 01:10:58 -0700470// This function applies binary patches to EMMC target files in a way that is safe (the original
471// file is not touched until we have the desired replacement for it) and idempotent (it's okay to
472// run this program multiple times).
Doug Zongker512536a2010-02-17 16:11:44 -0800473//
Tao Bao40e144d2017-03-15 01:10:58 -0700474// - If the SHA-1 hash of <target_filename> is <target_sha1_string>, does nothing and exits
475// successfully.
Doug Zongker512536a2010-02-17 16:11:44 -0800476//
Tao Bao40e144d2017-03-15 01:10:58 -0700477// - Otherwise, if the SHA-1 hash of <source_filename> is one of the entries in <patch_sha1_str>,
478// the corresponding patch from <patch_data> (which must be a VAL_BLOB) is applied to produce a
479// new file (the type of patch is automatically detected from the blob data). If that new file
480// has SHA-1 hash <target_sha1_str>, moves it to replace <target_filename>, and exits
481// successfully. Note that if <source_filename> and <target_filename> are not the same,
482// <source_filename> is NOT deleted on success. <target_filename> may be the string "-" to mean
483// "the same as <source_filename>".
Doug Zongker512536a2010-02-17 16:11:44 -0800484//
Tao Bao40e144d2017-03-15 01:10:58 -0700485// - Otherwise, or if any error is encountered, exits with non-zero status.
Doug Zongker512536a2010-02-17 16:11:44 -0800486//
Tao Bao40e144d2017-03-15 01:10:58 -0700487// <source_filename> must refer to an EMMC partition to read the source data. See the comments for
488// the LoadPartitionContents() function above for the format of such a filename. <target_size> has
489// become obsolete since we have dropped the support for patching non-EMMC targets (EMMC targets
490// have the size embedded in the filename).
491int applypatch(const char* source_filename, const char* target_filename,
492 const char* target_sha1_str, size_t target_size __unused,
Tianjie Xuaced5d92016-10-12 10:55:04 -0700493 const std::vector<std::string>& patch_sha1_str,
Tao Bao40e144d2017-03-15 01:10:58 -0700494 const std::vector<std::unique_ptr<Value>>& patch_data, const Value* bonus_data) {
495 printf("patch %s: ", source_filename);
Doug Zongker512536a2010-02-17 16:11:44 -0800496
Tao Bao40e144d2017-03-15 01:10:58 -0700497 if (target_filename[0] == '-' && target_filename[1] == '\0') {
498 target_filename = source_filename;
499 }
500
501 if (strncmp(target_filename, "EMMC:", 5) != 0) {
502 printf("Supporting patching EMMC targets only.\n");
503 return 1;
504 }
505
506 uint8_t target_sha1[SHA_DIGEST_LENGTH];
507 if (ParseSha1(target_sha1_str, target_sha1) != 0) {
508 printf("failed to parse tgt-sha1 \"%s\"\n", target_sha1_str);
509 return 1;
510 }
511
512 // We try to load the target file into the source_file object.
513 FileContents source_file;
514 if (LoadFileContents(target_filename, &source_file) == 0) {
515 if (memcmp(source_file.sha1, target_sha1, SHA_DIGEST_LENGTH) == 0) {
516 // The early-exit case: the patch was already applied, this file has the desired hash, nothing
517 // for us to do.
518 printf("already %s\n", short_sha1(target_sha1).c_str());
519 return 0;
Doug Zongker512536a2010-02-17 16:11:44 -0800520 }
Tao Bao40e144d2017-03-15 01:10:58 -0700521 }
Doug Zongker512536a2010-02-17 16:11:44 -0800522
Tao Bao40e144d2017-03-15 01:10:58 -0700523 if (source_file.data.empty() ||
524 (target_filename != source_filename && strcmp(target_filename, source_filename) != 0)) {
525 // Need to load the source file: either we failed to load the target file, or we did but it's
526 // different from the expected.
527 source_file.data.clear();
528 LoadFileContents(source_filename, &source_file);
529 }
530
531 if (!source_file.data.empty()) {
532 int to_use = FindMatchingPatch(source_file.sha1, patch_sha1_str);
533 if (to_use != -1) {
534 return GenerateTarget(source_file, patch_data[to_use], target_filename, target_sha1,
535 bonus_data);
Doug Zongkerc4351c72010-02-22 14:46:32 -0800536 }
Tao Bao40e144d2017-03-15 01:10:58 -0700537 }
Doug Zongker512536a2010-02-17 16:11:44 -0800538
Tao Bao40e144d2017-03-15 01:10:58 -0700539 printf("source file is bad; trying copy\n");
Doug Zongker512536a2010-02-17 16:11:44 -0800540
Tao Bao40e144d2017-03-15 01:10:58 -0700541 FileContents copy_file;
542 if (LoadFileContents(CACHE_TEMP_SOURCE, &copy_file) < 0) {
543 printf("failed to read copy file\n");
544 return 1;
545 }
Doug Zongker512536a2010-02-17 16:11:44 -0800546
Tao Bao40e144d2017-03-15 01:10:58 -0700547 int to_use = FindMatchingPatch(copy_file.sha1, patch_sha1_str);
548 if (to_use == -1) {
549 printf("copy file doesn't match source SHA-1s either\n");
550 return 1;
551 }
Doug Zongkerc4351c72010-02-22 14:46:32 -0800552
Tao Bao40e144d2017-03-15 01:10:58 -0700553 return GenerateTarget(copy_file, patch_data[to_use], target_filename, target_sha1, bonus_data);
Doug Zongker1c43c972012-02-28 11:07:09 -0800554}
555
Tao Baoabba55b2015-07-17 18:11:12 -0700556/*
557 * This function flashes a given image to the target partition. It verifies
558 * the target cheksum first, and will return if target has the desired hash.
559 * It checks the checksum of the given source image before flashing, and
560 * verifies the target partition afterwards. The function is idempotent.
561 * Returns zero on success.
562 */
563int applypatch_flash(const char* source_filename, const char* target_filename,
564 const char* target_sha1_str, size_t target_size) {
Tao Bao6e02ea92016-11-17 11:24:07 -0800565 printf("flash %s: ", target_filename);
Tao Baoabba55b2015-07-17 18:11:12 -0700566
Tao Bao6e02ea92016-11-17 11:24:07 -0800567 uint8_t target_sha1[SHA_DIGEST_LENGTH];
568 if (ParseSha1(target_sha1_str, target_sha1) != 0) {
569 printf("failed to parse tgt-sha1 \"%s\"\n", target_sha1_str);
570 return 1;
571 }
Tao Baoabba55b2015-07-17 18:11:12 -0700572
Tao Bao6e02ea92016-11-17 11:24:07 -0800573 std::string target_str(target_filename);
574 std::vector<std::string> pieces = android::base::Split(target_str, ":");
575 if (pieces.size() != 2 || pieces[0] != "EMMC") {
576 printf("invalid target name \"%s\"", target_filename);
577 return 1;
578 }
Tao Baoabba55b2015-07-17 18:11:12 -0700579
Tao Bao6e02ea92016-11-17 11:24:07 -0800580 // Load the target into the source_file object to see if already applied.
581 pieces.push_back(std::to_string(target_size));
582 pieces.push_back(target_sha1_str);
583 std::string fullname = android::base::Join(pieces, ':');
584 FileContents source_file;
585 if (LoadPartitionContents(fullname, &source_file) == 0 &&
586 memcmp(source_file.sha1, target_sha1, SHA_DIGEST_LENGTH) == 0) {
587 // The early-exit case: the image was already applied, this partition
588 // has the desired hash, nothing for us to do.
589 printf("already %s\n", short_sha1(target_sha1).c_str());
Tao Baoabba55b2015-07-17 18:11:12 -0700590 return 0;
Tao Bao6e02ea92016-11-17 11:24:07 -0800591 }
592
593 if (LoadFileContents(source_filename, &source_file) == 0) {
594 if (memcmp(source_file.sha1, target_sha1, SHA_DIGEST_LENGTH) != 0) {
595 // The source doesn't have desired checksum.
596 printf("source \"%s\" doesn't have expected sha1 sum\n", source_filename);
597 printf("expected: %s, found: %s\n", short_sha1(target_sha1).c_str(),
598 short_sha1(source_file.sha1).c_str());
599 return 1;
600 }
601 }
602
603 if (WriteToPartition(source_file.data.data(), target_size, target_filename) != 0) {
604 printf("write of copied data to %s failed\n", target_filename);
605 return 1;
606 }
607 return 0;
Tao Baoabba55b2015-07-17 18:11:12 -0700608}
609
Tao Bao40e144d2017-03-15 01:10:58 -0700610static int GenerateTarget(const FileContents& source_file, const std::unique_ptr<Value>& patch,
611 const std::string& target_filename,
612 const uint8_t target_sha1[SHA_DIGEST_LENGTH], const Value* bonus_data) {
Tao Bao6e02ea92016-11-17 11:24:07 -0800613 if (patch->type != VAL_BLOB) {
614 printf("patch is not a blob\n");
615 return 1;
616 }
Yabin Cuid483c202016-02-03 17:08:52 -0800617
Tao Bao6e02ea92016-11-17 11:24:07 -0800618 const char* header = &patch->data[0];
619 size_t header_bytes_read = patch->data.size();
620 bool use_bsdiff = false;
621 if (header_bytes_read >= 8 && memcmp(header, "BSDIFF40", 8) == 0) {
622 use_bsdiff = true;
623 } else if (header_bytes_read >= 8 && memcmp(header, "IMGDIFF2", 8) == 0) {
624 use_bsdiff = false;
625 } else {
626 printf("Unknown patch file format\n");
627 return 1;
628 }
Doug Zongker512536a2010-02-17 16:11:44 -0800629
Tao Bao40e144d2017-03-15 01:10:58 -0700630 CHECK(android::base::StartsWith(target_filename, "EMMC:"));
Doug Zongkerc4351c72010-02-22 14:46:32 -0800631
Tao Bao40e144d2017-03-15 01:10:58 -0700632 // We still write the original source to cache, in case the partition write is interrupted.
633 if (MakeFreeSpaceOnCache(source_file.data.size()) < 0) {
634 printf("not enough free space on /cache\n");
635 return 1;
636 }
637 if (SaveFileContents(CACHE_TEMP_SOURCE, &source_file) < 0) {
638 printf("failed to back up source file\n");
639 return 1;
640 }
641
642 // We store the decoded output in memory.
Tao Bao6e02ea92016-11-17 11:24:07 -0800643 std::string memory_sink_str; // Don't need to reserve space.
Tao Baoc0e1c462017-02-01 10:20:10 -0800644 SinkFn sink = [&memory_sink_str](const unsigned char* data, size_t len) {
645 memory_sink_str.append(reinterpret_cast<const char*>(data), len);
646 return len;
647 };
Doug Zongkerc4351c72010-02-22 14:46:32 -0800648
Tao Bao40e144d2017-03-15 01:10:58 -0700649 SHA_CTX ctx;
650 SHA1_Init(&ctx);
Tao Bao6e02ea92016-11-17 11:24:07 -0800651
Tao Bao40e144d2017-03-15 01:10:58 -0700652 int result;
653 if (use_bsdiff) {
654 result = ApplyBSDiffPatch(source_file.data.data(), source_file.data.size(), patch.get(), 0,
Tao Baoc0e1c462017-02-01 10:20:10 -0800655 sink, &ctx);
Tao Bao40e144d2017-03-15 01:10:58 -0700656 } else {
657 result = ApplyImagePatch(source_file.data.data(), source_file.data.size(), patch.get(), sink,
Tao Baoc0e1c462017-02-01 10:20:10 -0800658 &ctx, bonus_data);
Tao Bao40e144d2017-03-15 01:10:58 -0700659 }
Tao Bao6e02ea92016-11-17 11:24:07 -0800660
Tao Bao40e144d2017-03-15 01:10:58 -0700661 if (result != 0) {
662 printf("applying patch failed\n");
663 return 1;
664 }
Tao Bao6e02ea92016-11-17 11:24:07 -0800665
666 uint8_t current_target_sha1[SHA_DIGEST_LENGTH];
667 SHA1_Final(current_target_sha1, &ctx);
668 if (memcmp(current_target_sha1, target_sha1, SHA_DIGEST_LENGTH) != 0) {
669 printf("patch did not produce expected sha1\n");
670 return 1;
671 } else {
672 printf("now %s\n", short_sha1(target_sha1).c_str());
673 }
674
Tao Bao40e144d2017-03-15 01:10:58 -0700675 // Write back the temp file to the partition.
676 if (WriteToPartition(reinterpret_cast<const unsigned char*>(memory_sink_str.c_str()),
677 memory_sink_str.size(), target_filename) != 0) {
678 printf("write of patched data to %s failed\n", target_filename.c_str());
679 return 1;
Tao Bao6e02ea92016-11-17 11:24:07 -0800680 }
681
Tao Bao40e144d2017-03-15 01:10:58 -0700682 // Delete the backup copy of the source.
683 unlink(CACHE_TEMP_SOURCE);
Tao Bao6e02ea92016-11-17 11:24:07 -0800684
685 // Success!
686 return 0;
Doug Zongker512536a2010-02-17 16:11:44 -0800687}