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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
17#include <errno.h>
Tao Baoba9a42a2015-06-23 23:23:33 -070018#include <fcntl.h>
Doug Zongker512536a2010-02-17 16:11:44 -080019#include <libgen.h>
20#include <stdio.h>
21#include <stdlib.h>
22#include <string.h>
23#include <sys/stat.h>
24#include <sys/statfs.h>
25#include <sys/types.h>
Doug Zongker512536a2010-02-17 16:11:44 -080026#include <unistd.h>
27
Elliott Hughes4b166f02015-12-04 15:30:20 -080028#include <android-base/strings.h>
Tao Baoaca8e892015-07-17 11:47:44 -070029
Doug Zongker512536a2010-02-17 16:11:44 -080030#include "mincrypt/sha.h"
31#include "applypatch.h"
32#include "mtdutils/mtdutils.h"
Doug Zongkerc4351c72010-02-22 14:46:32 -080033#include "edify/expr.h"
Tao Baoe6aa3322015-08-05 15:20:27 -070034#include "print_sha1.h"
Doug Zongker512536a2010-02-17 16:11:44 -080035
Doug Zongkerf291d852010-07-07 13:55:25 -070036static int LoadPartitionContents(const char* filename, FileContents* file);
Doug Zongkerbc7ffed2014-08-15 14:31:52 -070037static ssize_t FileSink(const unsigned char* data, ssize_t len, void* token);
Doug Zongker1c43c972012-02-28 11:07:09 -080038static int GenerateTarget(FileContents* source_file,
39 const Value* source_patch_value,
40 FileContents* copy_file,
41 const Value* copy_patch_value,
42 const char* source_filename,
43 const char* target_filename,
44 const uint8_t target_sha1[SHA_DIGEST_SIZE],
Doug Zongkera3ccba62012-08-20 15:28:02 -070045 size_t target_size,
46 const Value* bonus_data);
Doug Zongker512536a2010-02-17 16:11:44 -080047
Tao Baoaca8e892015-07-17 11:47:44 -070048static bool mtd_partitions_scanned = false;
Doug Zongker512536a2010-02-17 16:11:44 -080049
Doug Zongkera1bc1482014-02-13 15:18:19 -080050// Read a file into memory; store the file contents and associated
Hristo Bojinovdb314d62010-08-02 10:29:49 -070051// metadata in *file.
52//
53// Return 0 on success.
Doug Zongkera1bc1482014-02-13 15:18:19 -080054int LoadFileContents(const char* filename, FileContents* file) {
Doug Zongker512536a2010-02-17 16:11:44 -080055 file->data = NULL;
Doug Zongker512536a2010-02-17 16:11:44 -080056
Doug Zongkerf291d852010-07-07 13:55:25 -070057 // A special 'filename' beginning with "MTD:" or "EMMC:" means to
58 // load the contents of a partition.
59 if (strncmp(filename, "MTD:", 4) == 0 ||
60 strncmp(filename, "EMMC:", 5) == 0) {
61 return LoadPartitionContents(filename, file);
Doug Zongkerc4351c72010-02-22 14:46:32 -080062 }
Doug Zongker512536a2010-02-17 16:11:44 -080063
Doug Zongkerc4351c72010-02-22 14:46:32 -080064 if (stat(filename, &file->st) != 0) {
65 printf("failed to stat \"%s\": %s\n", filename, strerror(errno));
66 return -1;
67 }
68
69 file->size = file->st.st_size;
Tao Baoba9a42a2015-06-23 23:23:33 -070070 file->data = reinterpret_cast<unsigned char*>(malloc(file->size));
Doug Zongkerc4351c72010-02-22 14:46:32 -080071
72 FILE* f = fopen(filename, "rb");
73 if (f == NULL) {
74 printf("failed to open \"%s\": %s\n", filename, strerror(errno));
75 free(file->data);
76 file->data = NULL;
77 return -1;
78 }
79
Tao Baoba9a42a2015-06-23 23:23:33 -070080 size_t bytes_read = fread(file->data, 1, file->size, f);
81 if (bytes_read != static_cast<size_t>(file->size)) {
82 printf("short read of \"%s\" (%zu bytes of %zd)\n", filename, bytes_read, file->size);
Doug Zongkerc4351c72010-02-22 14:46:32 -080083 free(file->data);
84 file->data = NULL;
85 return -1;
86 }
87 fclose(f);
88
Doug Zongkerbac7fba2013-04-10 11:32:17 -070089 SHA_hash(file->data, file->size, file->sha1);
Doug Zongkerc4351c72010-02-22 14:46:32 -080090 return 0;
Doug Zongker512536a2010-02-17 16:11:44 -080091}
92
Doug Zongkerf291d852010-07-07 13:55:25 -070093// Load the contents of an MTD or EMMC partition into the provided
Doug Zongker512536a2010-02-17 16:11:44 -080094// FileContents. filename should be a string of the form
Doug Zongkerf291d852010-07-07 13:55:25 -070095// "MTD:<partition_name>:<size_1>:<sha1_1>:<size_2>:<sha1_2>:..." (or
96// "EMMC:<partition_device>:..."). The smallest size_n bytes for
97// which that prefix of the partition contents has the corresponding
98// sha1 hash will be loaded. It is acceptable for a size value to be
99// repeated with different sha1s. Will return 0 on success.
Doug Zongker512536a2010-02-17 16:11:44 -0800100//
101// This complexity is needed because if an OTA installation is
102// interrupted, the partition might contain either the source or the
103// target data, which might be of different lengths. We need to know
Doug Zongkerf291d852010-07-07 13:55:25 -0700104// the length in order to read from a partition (there is no
105// "end-of-file" marker), so the caller must specify the possible
106// lengths and the hash of the data, and we'll do the load expecting
107// to find one of those hashes.
108enum PartitionType { MTD, EMMC };
109
110static int LoadPartitionContents(const char* filename, FileContents* file) {
Tao Baoaca8e892015-07-17 11:47:44 -0700111 std::string copy(filename);
112 std::vector<std::string> pieces = android::base::Split(copy, ":");
113 if (pieces.size() < 4 || pieces.size() % 2 != 0) {
114 printf("LoadPartitionContents called with bad filename (%s)\n", filename);
115 return -1;
116 }
Doug Zongkerf291d852010-07-07 13:55:25 -0700117
118 enum PartitionType type;
Tao Baoaca8e892015-07-17 11:47:44 -0700119 if (pieces[0] == "MTD") {
Doug Zongkerf291d852010-07-07 13:55:25 -0700120 type = MTD;
Tao Baoaca8e892015-07-17 11:47:44 -0700121 } else if (pieces[0] == "EMMC") {
Doug Zongkerf291d852010-07-07 13:55:25 -0700122 type = EMMC;
123 } else {
Tao Baoba9a42a2015-06-23 23:23:33 -0700124 printf("LoadPartitionContents called with bad filename (%s)\n", filename);
Doug Zongkerc4351c72010-02-22 14:46:32 -0800125 return -1;
Doug Zongker512536a2010-02-17 16:11:44 -0800126 }
Tao Baoaca8e892015-07-17 11:47:44 -0700127 const char* partition = pieces[1].c_str();
Doug Zongker512536a2010-02-17 16:11:44 -0800128
Tao Baoaca8e892015-07-17 11:47:44 -0700129 size_t pairs = (pieces.size() - 2) / 2; // # of (size, sha1) pairs in filename
130 std::vector<size_t> index(pairs);
131 std::vector<size_t> size(pairs);
132 std::vector<std::string> sha1sum(pairs);
Doug Zongker512536a2010-02-17 16:11:44 -0800133
Tao Baoaca8e892015-07-17 11:47:44 -0700134 for (size_t i = 0; i < pairs; ++i) {
135 size[i] = strtol(pieces[i*2+2].c_str(), NULL, 10);
Doug Zongkerc4351c72010-02-22 14:46:32 -0800136 if (size[i] == 0) {
Doug Zongkerf291d852010-07-07 13:55:25 -0700137 printf("LoadPartitionContents called with bad size (%s)\n", filename);
Doug Zongkerc4351c72010-02-22 14:46:32 -0800138 return -1;
139 }
Tao Baoaca8e892015-07-17 11:47:44 -0700140 sha1sum[i] = pieces[i*2+3].c_str();
Doug Zongkerc4351c72010-02-22 14:46:32 -0800141 index[i] = i;
142 }
Doug Zongker512536a2010-02-17 16:11:44 -0800143
Tao Baoaca8e892015-07-17 11:47:44 -0700144 // Sort the index[] array so it indexes the pairs in order of increasing size.
145 sort(index.begin(), index.end(),
146 [&](const size_t& i, const size_t& j) {
147 return (size[i] < size[j]);
148 }
149 );
Doug Zongker512536a2010-02-17 16:11:44 -0800150
Doug Zongkerf291d852010-07-07 13:55:25 -0700151 MtdReadContext* ctx = NULL;
152 FILE* dev = NULL;
Doug Zongker512536a2010-02-17 16:11:44 -0800153
Doug Zongkerf291d852010-07-07 13:55:25 -0700154 switch (type) {
Tao Baoba9a42a2015-06-23 23:23:33 -0700155 case MTD: {
Doug Zongkerf291d852010-07-07 13:55:25 -0700156 if (!mtd_partitions_scanned) {
157 mtd_scan_partitions();
Tao Baoaca8e892015-07-17 11:47:44 -0700158 mtd_partitions_scanned = true;
Doug Zongkerf291d852010-07-07 13:55:25 -0700159 }
Doug Zongker512536a2010-02-17 16:11:44 -0800160
Doug Zongkerf291d852010-07-07 13:55:25 -0700161 const MtdPartition* mtd = mtd_find_partition_by_name(partition);
162 if (mtd == NULL) {
Tao Baoaca8e892015-07-17 11:47:44 -0700163 printf("mtd partition \"%s\" not found (loading %s)\n", partition, filename);
Doug Zongkerf291d852010-07-07 13:55:25 -0700164 return -1;
165 }
166
167 ctx = mtd_read_partition(mtd);
168 if (ctx == NULL) {
Tao Baoaca8e892015-07-17 11:47:44 -0700169 printf("failed to initialize read of mtd partition \"%s\"\n", partition);
Doug Zongkerf291d852010-07-07 13:55:25 -0700170 return -1;
171 }
172 break;
Tao Baoba9a42a2015-06-23 23:23:33 -0700173 }
Doug Zongkerf291d852010-07-07 13:55:25 -0700174
175 case EMMC:
176 dev = fopen(partition, "rb");
177 if (dev == NULL) {
Tao Baoaca8e892015-07-17 11:47:44 -0700178 printf("failed to open emmc partition \"%s\": %s\n", partition, strerror(errno));
Doug Zongkerf291d852010-07-07 13:55:25 -0700179 return -1;
180 }
Doug Zongkerc4351c72010-02-22 14:46:32 -0800181 }
Doug Zongker512536a2010-02-17 16:11:44 -0800182
Doug Zongkerc4351c72010-02-22 14:46:32 -0800183 SHA_CTX sha_ctx;
184 SHA_init(&sha_ctx);
185 uint8_t parsed_sha[SHA_DIGEST_SIZE];
186
Tao Baoaca8e892015-07-17 11:47:44 -0700187 // Allocate enough memory to hold the largest size.
Tao Baoba9a42a2015-06-23 23:23:33 -0700188 file->data = reinterpret_cast<unsigned char*>(malloc(size[index[pairs-1]]));
Doug Zongkerc4351c72010-02-22 14:46:32 -0800189 char* p = (char*)file->data;
190 file->size = 0; // # bytes read so far
Tao Baoaca8e892015-07-17 11:47:44 -0700191 bool found = false;
Doug Zongkerc4351c72010-02-22 14:46:32 -0800192
Tao Baoaca8e892015-07-17 11:47:44 -0700193 for (size_t i = 0; i < pairs; ++i) {
194 // Read enough additional bytes to get us up to the next size. (Again,
195 // we're trying the possibilities in order of increasing size).
Doug Zongkerc4351c72010-02-22 14:46:32 -0800196 size_t next = size[index[i]] - file->size;
197 size_t read = 0;
198 if (next > 0) {
Doug Zongkerf291d852010-07-07 13:55:25 -0700199 switch (type) {
200 case MTD:
201 read = mtd_read_data(ctx, p, next);
202 break;
203
204 case EMMC:
205 read = fread(p, 1, next, dev);
206 break;
207 }
Doug Zongkerc4351c72010-02-22 14:46:32 -0800208 if (next != read) {
Mark Salyzynf3bb31c2014-03-14 09:39:48 -0700209 printf("short read (%zu bytes of %zu) for partition \"%s\"\n",
Doug Zongkerc4351c72010-02-22 14:46:32 -0800210 read, next, partition);
211 free(file->data);
212 file->data = NULL;
213 return -1;
214 }
215 SHA_update(&sha_ctx, p, read);
216 file->size += read;
217 }
218
219 // Duplicate the SHA context and finalize the duplicate so we can
220 // check it against this pair's expected hash.
221 SHA_CTX temp_ctx;
222 memcpy(&temp_ctx, &sha_ctx, sizeof(SHA_CTX));
223 const uint8_t* sha_so_far = SHA_final(&temp_ctx);
224
Tao Baoaca8e892015-07-17 11:47:44 -0700225 if (ParseSha1(sha1sum[index[i]].c_str(), parsed_sha) != 0) {
226 printf("failed to parse sha1 %s in %s\n", sha1sum[index[i]].c_str(), filename);
Doug Zongkerc4351c72010-02-22 14:46:32 -0800227 free(file->data);
228 file->data = NULL;
229 return -1;
230 }
231
232 if (memcmp(sha_so_far, parsed_sha, SHA_DIGEST_SIZE) == 0) {
233 // we have a match. stop reading the partition; we'll return
234 // the data we've read so far.
Mark Salyzynf3bb31c2014-03-14 09:39:48 -0700235 printf("partition read matched size %zu sha %s\n",
Tao Baoaca8e892015-07-17 11:47:44 -0700236 size[index[i]], sha1sum[index[i]].c_str());
237 found = true;
Doug Zongkerc4351c72010-02-22 14:46:32 -0800238 break;
239 }
240
241 p += read;
242 }
243
Doug Zongkerf291d852010-07-07 13:55:25 -0700244 switch (type) {
245 case MTD:
246 mtd_read_close(ctx);
247 break;
248
249 case EMMC:
250 fclose(dev);
251 break;
252 }
253
Doug Zongkerc4351c72010-02-22 14:46:32 -0800254
Tao Baoaca8e892015-07-17 11:47:44 -0700255 if (!found) {
256 // Ran off the end of the list of (size,sha1) pairs without finding a match.
Tao Baoba9a42a2015-06-23 23:23:33 -0700257 printf("contents of partition \"%s\" didn't match %s\n", partition, filename);
Doug Zongker512536a2010-02-17 16:11:44 -0800258 free(file->data);
259 file->data = NULL;
260 return -1;
Doug Zongker512536a2010-02-17 16:11:44 -0800261 }
262
Doug Zongkerc4351c72010-02-22 14:46:32 -0800263 const uint8_t* sha_final = SHA_final(&sha_ctx);
Tao Baoba9a42a2015-06-23 23:23:33 -0700264 for (size_t i = 0; i < SHA_DIGEST_SIZE; ++i) {
Doug Zongkerc4351c72010-02-22 14:46:32 -0800265 file->sha1[i] = sha_final[i];
Doug Zongker512536a2010-02-17 16:11:44 -0800266 }
267
Doug Zongkerc4351c72010-02-22 14:46:32 -0800268 // Fake some stat() info.
269 file->st.st_mode = 0644;
270 file->st.st_uid = 0;
271 file->st.st_gid = 0;
Doug Zongker512536a2010-02-17 16:11:44 -0800272
Doug Zongkerc4351c72010-02-22 14:46:32 -0800273 return 0;
Doug Zongker512536a2010-02-17 16:11:44 -0800274}
275
276
277// Save the contents of the given FileContents object under the given
278// filename. Return 0 on success.
Doug Zongker1c43c972012-02-28 11:07:09 -0800279int SaveFileContents(const char* filename, const FileContents* file) {
Michael Rungebe81e512014-10-29 12:42:15 -0700280 int fd = open(filename, O_WRONLY | O_CREAT | O_TRUNC | O_SYNC, S_IRUSR | S_IWUSR);
Doug Zongkerc4351c72010-02-22 14:46:32 -0800281 if (fd < 0) {
Tao Baoba9a42a2015-06-23 23:23:33 -0700282 printf("failed to open \"%s\" for write: %s\n", filename, strerror(errno));
Doug Zongkerc4351c72010-02-22 14:46:32 -0800283 return -1;
284 }
Doug Zongker512536a2010-02-17 16:11:44 -0800285
Doug Zongker1c43c972012-02-28 11:07:09 -0800286 ssize_t bytes_written = FileSink(file->data, file->size, &fd);
287 if (bytes_written != file->size) {
Tao Baoba9a42a2015-06-23 23:23:33 -0700288 printf("short write of \"%s\" (%zd bytes of %zd) (%s)\n",
289 filename, bytes_written, file->size, strerror(errno));
Doug Zongkerc4351c72010-02-22 14:46:32 -0800290 close(fd);
291 return -1;
292 }
Michael Rungebe81e512014-10-29 12:42:15 -0700293 if (fsync(fd) != 0) {
294 printf("fsync of \"%s\" failed: %s\n", filename, strerror(errno));
295 return -1;
296 }
297 if (close(fd) != 0) {
298 printf("close of \"%s\" failed: %s\n", filename, strerror(errno));
299 return -1;
300 }
Doug Zongker512536a2010-02-17 16:11:44 -0800301
Doug Zongker1c43c972012-02-28 11:07:09 -0800302 if (chmod(filename, file->st.st_mode) != 0) {
Doug Zongkerc4351c72010-02-22 14:46:32 -0800303 printf("chmod of \"%s\" failed: %s\n", filename, strerror(errno));
304 return -1;
305 }
Doug Zongker1c43c972012-02-28 11:07:09 -0800306 if (chown(filename, file->st.st_uid, file->st.st_gid) != 0) {
Doug Zongkerc4351c72010-02-22 14:46:32 -0800307 printf("chown of \"%s\" failed: %s\n", filename, strerror(errno));
308 return -1;
309 }
Doug Zongker512536a2010-02-17 16:11:44 -0800310
Doug Zongkerc4351c72010-02-22 14:46:32 -0800311 return 0;
Doug Zongker512536a2010-02-17 16:11:44 -0800312}
313
Doug Zongkerf291d852010-07-07 13:55:25 -0700314// Write a memory buffer to 'target' partition, a string of the form
Tao Bao1ce7a2a2015-07-24 15:29:12 -0700315// "MTD:<partition>[:...]" or "EMMC:<partition_device>[:...]". The target name
316// might contain multiple colons, but WriteToPartition() only uses the first
317// two and ignores the rest. Return 0 on success.
Tao Baoba9a42a2015-06-23 23:23:33 -0700318int WriteToPartition(unsigned char* data, size_t len, const char* target) {
Tao Baoaca8e892015-07-17 11:47:44 -0700319 std::string copy(target);
320 std::vector<std::string> pieces = android::base::Split(copy, ":");
321
Tao Bao1ce7a2a2015-07-24 15:29:12 -0700322 if (pieces.size() < 2) {
Tao Baoaca8e892015-07-17 11:47:44 -0700323 printf("WriteToPartition called with bad target (%s)\n", target);
324 return -1;
325 }
Doug Zongkerf291d852010-07-07 13:55:25 -0700326
327 enum PartitionType type;
Tao Baoaca8e892015-07-17 11:47:44 -0700328 if (pieces[0] == "MTD") {
Doug Zongkerf291d852010-07-07 13:55:25 -0700329 type = MTD;
Tao Baoaca8e892015-07-17 11:47:44 -0700330 } else if (pieces[0] == "EMMC") {
Doug Zongkerf291d852010-07-07 13:55:25 -0700331 type = EMMC;
332 } else {
333 printf("WriteToPartition called with bad target (%s)\n", target);
334 return -1;
335 }
Tao Baoaca8e892015-07-17 11:47:44 -0700336 const char* partition = pieces[1].c_str();
Doug Zongker512536a2010-02-17 16:11:44 -0800337
Doug Zongkerf291d852010-07-07 13:55:25 -0700338 switch (type) {
Tao Baoba9a42a2015-06-23 23:23:33 -0700339 case MTD: {
Doug Zongkerf291d852010-07-07 13:55:25 -0700340 if (!mtd_partitions_scanned) {
341 mtd_scan_partitions();
Tao Baoaca8e892015-07-17 11:47:44 -0700342 mtd_partitions_scanned = true;
Doug Zongkerf291d852010-07-07 13:55:25 -0700343 }
344
345 const MtdPartition* mtd = mtd_find_partition_by_name(partition);
346 if (mtd == NULL) {
Tao Baoba9a42a2015-06-23 23:23:33 -0700347 printf("mtd partition \"%s\" not found for writing\n", partition);
Doug Zongkerf291d852010-07-07 13:55:25 -0700348 return -1;
349 }
350
351 MtdWriteContext* ctx = mtd_write_partition(mtd);
352 if (ctx == NULL) {
Tao Baoba9a42a2015-06-23 23:23:33 -0700353 printf("failed to init mtd partition \"%s\" for writing\n", partition);
Doug Zongkerf291d852010-07-07 13:55:25 -0700354 return -1;
355 }
356
Tao Baoba9a42a2015-06-23 23:23:33 -0700357 size_t written = mtd_write_data(ctx, reinterpret_cast<char*>(data), len);
Doug Zongkerf291d852010-07-07 13:55:25 -0700358 if (written != len) {
Tao Baoba9a42a2015-06-23 23:23:33 -0700359 printf("only wrote %zu of %zu bytes to MTD %s\n", written, len, partition);
Doug Zongkerf291d852010-07-07 13:55:25 -0700360 mtd_write_close(ctx);
361 return -1;
362 }
363
364 if (mtd_erase_blocks(ctx, -1) < 0) {
365 printf("error finishing mtd write of %s\n", partition);
366 mtd_write_close(ctx);
367 return -1;
368 }
369
370 if (mtd_write_close(ctx)) {
371 printf("error closing mtd write of %s\n", partition);
372 return -1;
373 }
374 break;
Tao Baoba9a42a2015-06-23 23:23:33 -0700375 }
Doug Zongkerf291d852010-07-07 13:55:25 -0700376
Tao Baoba9a42a2015-06-23 23:23:33 -0700377 case EMMC: {
Doug Zongker044a0b42013-07-08 09:42:54 -0700378 size_t start = 0;
Tao Baoba9a42a2015-06-23 23:23:33 -0700379 bool success = false;
Michael Rungebe81e512014-10-29 12:42:15 -0700380 int fd = open(partition, O_RDWR | O_SYNC);
Doug Zongkerc870a992013-07-09 10:34:46 -0700381 if (fd < 0) {
Doug Zongker044a0b42013-07-08 09:42:54 -0700382 printf("failed to open %s: %s\n", partition, strerror(errno));
Doug Zongkerf291d852010-07-07 13:55:25 -0700383 return -1;
384 }
Doug Zongker044a0b42013-07-08 09:42:54 -0700385
Tao Baoaca8e892015-07-17 11:47:44 -0700386 for (size_t attempt = 0; attempt < 2; ++attempt) {
Elliott Hughes7bad7c42015-04-28 17:24:24 -0700387 if (TEMP_FAILURE_RETRY(lseek(fd, start, SEEK_SET)) == -1) {
Tao Baoba9a42a2015-06-23 23:23:33 -0700388 printf("failed seek on %s: %s\n", partition, strerror(errno));
Elliott Hughes7bad7c42015-04-28 17:24:24 -0700389 return -1;
390 }
Doug Zongker044a0b42013-07-08 09:42:54 -0700391 while (start < len) {
392 size_t to_write = len - start;
Doug Zongker168724c2013-12-19 15:16:57 -0800393 if (to_write > 1<<20) to_write = 1<<20;
Doug Zongker044a0b42013-07-08 09:42:54 -0700394
Elliott Hughes7bad7c42015-04-28 17:24:24 -0700395 ssize_t written = TEMP_FAILURE_RETRY(write(fd, data+start, to_write));
396 if (written == -1) {
397 printf("failed write writing to %s: %s\n", partition, strerror(errno));
398 return -1;
Doug Zongker044a0b42013-07-08 09:42:54 -0700399 }
Doug Zongkerc870a992013-07-09 10:34:46 -0700400 start += written;
Doug Zongker044a0b42013-07-08 09:42:54 -0700401 }
Michael Rungebe81e512014-10-29 12:42:15 -0700402 if (fsync(fd) != 0) {
Tao Baoba9a42a2015-06-23 23:23:33 -0700403 printf("failed to sync to %s (%s)\n", partition, strerror(errno));
Michael Rungebe81e512014-10-29 12:42:15 -0700404 return -1;
405 }
406 if (close(fd) != 0) {
Tao Baoba9a42a2015-06-23 23:23:33 -0700407 printf("failed to close %s (%s)\n", partition, strerror(errno));
Michael Rungebe81e512014-10-29 12:42:15 -0700408 return -1;
409 }
410 fd = open(partition, O_RDONLY);
411 if (fd < 0) {
Tao Baoba9a42a2015-06-23 23:23:33 -0700412 printf("failed to reopen %s for verify (%s)\n", partition, strerror(errno));
Michael Rungebe81e512014-10-29 12:42:15 -0700413 return -1;
414 }
Doug Zongker044a0b42013-07-08 09:42:54 -0700415
Tao Baoba9a42a2015-06-23 23:23:33 -0700416 // Drop caches so our subsequent verification read
Doug Zongker044a0b42013-07-08 09:42:54 -0700417 // won't just be reading the cache.
418 sync();
Doug Zongkerc870a992013-07-09 10:34:46 -0700419 int dc = open("/proc/sys/vm/drop_caches", O_WRONLY);
Elliott Hughes7bad7c42015-04-28 17:24:24 -0700420 if (TEMP_FAILURE_RETRY(write(dc, "3\n", 2)) == -1) {
421 printf("write to /proc/sys/vm/drop_caches failed: %s\n", strerror(errno));
422 } else {
423 printf(" caches dropped\n");
424 }
Doug Zongkerc870a992013-07-09 10:34:46 -0700425 close(dc);
Doug Zongker044a0b42013-07-08 09:42:54 -0700426 sleep(1);
Doug Zongker044a0b42013-07-08 09:42:54 -0700427
428 // verify
Elliott Hughes7bad7c42015-04-28 17:24:24 -0700429 if (TEMP_FAILURE_RETRY(lseek(fd, 0, SEEK_SET)) == -1) {
430 printf("failed to seek back to beginning of %s: %s\n",
431 partition, strerror(errno));
432 return -1;
433 }
Doug Zongker044a0b42013-07-08 09:42:54 -0700434 unsigned char buffer[4096];
435 start = len;
Tao Baoba9a42a2015-06-23 23:23:33 -0700436 for (size_t p = 0; p < len; p += sizeof(buffer)) {
Doug Zongker044a0b42013-07-08 09:42:54 -0700437 size_t to_read = len - p;
Tao Baoba9a42a2015-06-23 23:23:33 -0700438 if (to_read > sizeof(buffer)) {
439 to_read = sizeof(buffer);
440 }
Doug Zongker044a0b42013-07-08 09:42:54 -0700441
Doug Zongkerc870a992013-07-09 10:34:46 -0700442 size_t so_far = 0;
443 while (so_far < to_read) {
Elliott Hughes7bad7c42015-04-28 17:24:24 -0700444 ssize_t read_count =
445 TEMP_FAILURE_RETRY(read(fd, buffer+so_far, to_read-so_far));
446 if (read_count == -1) {
447 printf("verify read error %s at %zu: %s\n",
448 partition, p, strerror(errno));
449 return -1;
Doug Zongkerc870a992013-07-09 10:34:46 -0700450 }
Tao Baoba9a42a2015-06-23 23:23:33 -0700451 if (static_cast<size_t>(read_count) < to_read) {
Mark Salyzynf3bb31c2014-03-14 09:39:48 -0700452 printf("short verify read %s at %zu: %zd %zu %s\n",
Doug Zongkerc870a992013-07-09 10:34:46 -0700453 partition, p, read_count, to_read, strerror(errno));
454 }
455 so_far += read_count;
Doug Zongker044a0b42013-07-08 09:42:54 -0700456 }
457
Tao Baoba9a42a2015-06-23 23:23:33 -0700458 if (memcmp(buffer, data+p, to_read) != 0) {
Mark Salyzynf3bb31c2014-03-14 09:39:48 -0700459 printf("verification failed starting at %zu\n", p);
Doug Zongker044a0b42013-07-08 09:42:54 -0700460 start = p;
461 break;
462 }
463 }
464
465 if (start == len) {
Tao Baoabba55b2015-07-17 18:11:12 -0700466 printf("verification read succeeded (attempt %zu)\n", attempt+1);
Doug Zongker044a0b42013-07-08 09:42:54 -0700467 success = true;
468 break;
469 }
470 }
471
472 if (!success) {
473 printf("failed to verify after all attempts\n");
474 return -1;
475 }
476
Doug Zongkerc870a992013-07-09 10:34:46 -0700477 if (close(fd) != 0) {
Doug Zongkerf291d852010-07-07 13:55:25 -0700478 printf("error closing %s (%s)\n", partition, strerror(errno));
479 return -1;
480 }
Doug Zongkerbf4a69a2013-07-10 13:39:50 -0700481 sync();
Doug Zongkerf291d852010-07-07 13:55:25 -0700482 break;
Doug Zongker044a0b42013-07-08 09:42:54 -0700483 }
Doug Zongkerc4351c72010-02-22 14:46:32 -0800484 }
Doug Zongker512536a2010-02-17 16:11:44 -0800485
Doug Zongkerc4351c72010-02-22 14:46:32 -0800486 return 0;
Doug Zongker512536a2010-02-17 16:11:44 -0800487}
488
489
490// Take a string 'str' of 40 hex digits and parse it into the 20
491// byte array 'digest'. 'str' may contain only the digest or be of
492// the form "<digest>:<anything>". Return 0 on success, -1 on any
493// error.
494int ParseSha1(const char* str, uint8_t* digest) {
Doug Zongkerc4351c72010-02-22 14:46:32 -0800495 const char* ps = str;
496 uint8_t* pd = digest;
Tao Baoba9a42a2015-06-23 23:23:33 -0700497 for (int i = 0; i < SHA_DIGEST_SIZE * 2; ++i, ++ps) {
Doug Zongkerc4351c72010-02-22 14:46:32 -0800498 int digit;
499 if (*ps >= '0' && *ps <= '9') {
500 digit = *ps - '0';
501 } else if (*ps >= 'a' && *ps <= 'f') {
502 digit = *ps - 'a' + 10;
503 } else if (*ps >= 'A' && *ps <= 'F') {
504 digit = *ps - 'A' + 10;
505 } else {
506 return -1;
507 }
508 if (i % 2 == 0) {
509 *pd = digit << 4;
510 } else {
511 *pd |= digit;
512 ++pd;
513 }
Doug Zongker512536a2010-02-17 16:11:44 -0800514 }
Doug Zongkerc4351c72010-02-22 14:46:32 -0800515 if (*ps != '\0') return -1;
516 return 0;
Doug Zongker512536a2010-02-17 16:11:44 -0800517}
518
Doug Zongkerc4351c72010-02-22 14:46:32 -0800519// Search an array of sha1 strings for one matching the given sha1.
520// Return the index of the match on success, or -1 if no match is
521// found.
Doug Zongker044a0b42013-07-08 09:42:54 -0700522int FindMatchingPatch(uint8_t* sha1, char* const * const patch_sha1_str,
Doug Zongkerc4351c72010-02-22 14:46:32 -0800523 int num_patches) {
Doug Zongkerc4351c72010-02-22 14:46:32 -0800524 uint8_t patch_sha1[SHA_DIGEST_SIZE];
Tao Baoba9a42a2015-06-23 23:23:33 -0700525 for (int i = 0; i < num_patches; ++i) {
Doug Zongkerc4351c72010-02-22 14:46:32 -0800526 if (ParseSha1(patch_sha1_str[i], patch_sha1) == 0 &&
527 memcmp(patch_sha1, sha1, SHA_DIGEST_SIZE) == 0) {
528 return i;
529 }
Doug Zongker512536a2010-02-17 16:11:44 -0800530 }
Doug Zongkerc4351c72010-02-22 14:46:32 -0800531 return -1;
Doug Zongker512536a2010-02-17 16:11:44 -0800532}
533
534// Returns 0 if the contents of the file (argv[2]) or the cached file
535// match any of the sha1's on the command line (argv[3:]). Returns
536// nonzero otherwise.
Tao Baoba9a42a2015-06-23 23:23:33 -0700537int applypatch_check(const char* filename, int num_patches,
538 char** const patch_sha1_str) {
Doug Zongkerc4351c72010-02-22 14:46:32 -0800539 FileContents file;
540 file.data = NULL;
Doug Zongker512536a2010-02-17 16:11:44 -0800541
Doug Zongkerc4351c72010-02-22 14:46:32 -0800542 // It's okay to specify no sha1s; the check will pass if the
Doug Zongkerf291d852010-07-07 13:55:25 -0700543 // LoadFileContents is successful. (Useful for reading
Doug Zongkerc4351c72010-02-22 14:46:32 -0800544 // partitions, where the filename encodes the sha1s; no need to
545 // check them twice.)
Doug Zongkera1bc1482014-02-13 15:18:19 -0800546 if (LoadFileContents(filename, &file) != 0 ||
Doug Zongkerc4351c72010-02-22 14:46:32 -0800547 (num_patches > 0 &&
548 FindMatchingPatch(file.sha1, patch_sha1_str, num_patches) < 0)) {
549 printf("file \"%s\" doesn't have any of expected "
550 "sha1 sums; checking cache\n", filename);
Doug Zongker512536a2010-02-17 16:11:44 -0800551
Doug Zongkerc4351c72010-02-22 14:46:32 -0800552 free(file.data);
Doug Zongker1c43c972012-02-28 11:07:09 -0800553 file.data = NULL;
Doug Zongker512536a2010-02-17 16:11:44 -0800554
Doug Zongkerc4351c72010-02-22 14:46:32 -0800555 // If the source file is missing or corrupted, it might be because
556 // we were killed in the middle of patching it. A copy of it
557 // should have been made in CACHE_TEMP_SOURCE. If that file
558 // exists and matches the sha1 we're looking for, the check still
559 // passes.
560
Doug Zongkera1bc1482014-02-13 15:18:19 -0800561 if (LoadFileContents(CACHE_TEMP_SOURCE, &file) != 0) {
Doug Zongkerc4351c72010-02-22 14:46:32 -0800562 printf("failed to load cache file\n");
563 return 1;
564 }
565
566 if (FindMatchingPatch(file.sha1, patch_sha1_str, num_patches) < 0) {
567 printf("cache bits don't match any sha1 for \"%s\"\n", filename);
568 free(file.data);
569 return 1;
570 }
571 }
Doug Zongker512536a2010-02-17 16:11:44 -0800572
573 free(file.data);
Doug Zongkerc4351c72010-02-22 14:46:32 -0800574 return 0;
Doug Zongker512536a2010-02-17 16:11:44 -0800575}
576
577int ShowLicenses() {
Doug Zongkerc4351c72010-02-22 14:46:32 -0800578 ShowBSDiffLicense();
579 return 0;
Doug Zongker512536a2010-02-17 16:11:44 -0800580}
581
Doug Zongkerbc7ffed2014-08-15 14:31:52 -0700582ssize_t FileSink(const unsigned char* data, ssize_t len, void* token) {
Tao Baoba9a42a2015-06-23 23:23:33 -0700583 int fd = *reinterpret_cast<int *>(token);
Doug Zongkerc4351c72010-02-22 14:46:32 -0800584 ssize_t done = 0;
585 ssize_t wrote;
Tao Baoba9a42a2015-06-23 23:23:33 -0700586 while (done < len) {
Elliott Hughes7bad7c42015-04-28 17:24:24 -0700587 wrote = TEMP_FAILURE_RETRY(write(fd, data+done, len-done));
588 if (wrote == -1) {
Tao Baoba9a42a2015-06-23 23:23:33 -0700589 printf("error writing %zd bytes: %s\n", (len-done), strerror(errno));
Doug Zongkerc4351c72010-02-22 14:46:32 -0800590 return done;
591 }
592 done += wrote;
Doug Zongker512536a2010-02-17 16:11:44 -0800593 }
Doug Zongkerc4351c72010-02-22 14:46:32 -0800594 return done;
Doug Zongker512536a2010-02-17 16:11:44 -0800595}
596
597typedef struct {
Doug Zongkerc4351c72010-02-22 14:46:32 -0800598 unsigned char* buffer;
599 ssize_t size;
600 ssize_t pos;
Doug Zongker512536a2010-02-17 16:11:44 -0800601} MemorySinkInfo;
602
Doug Zongkerbc7ffed2014-08-15 14:31:52 -0700603ssize_t MemorySink(const unsigned char* data, ssize_t len, void* token) {
Tao Baoba9a42a2015-06-23 23:23:33 -0700604 MemorySinkInfo* msi = reinterpret_cast<MemorySinkInfo*>(token);
Doug Zongkerc4351c72010-02-22 14:46:32 -0800605 if (msi->size - msi->pos < len) {
606 return -1;
607 }
608 memcpy(msi->buffer + msi->pos, data, len);
609 msi->pos += len;
610 return len;
Doug Zongker512536a2010-02-17 16:11:44 -0800611}
612
613// Return the amount of free space (in bytes) on the filesystem
614// containing filename. filename must exist. Return -1 on error.
615size_t FreeSpaceForFile(const char* filename) {
Doug Zongkerc4351c72010-02-22 14:46:32 -0800616 struct statfs sf;
617 if (statfs(filename, &sf) != 0) {
618 printf("failed to statfs %s: %s\n", filename, strerror(errno));
619 return -1;
620 }
caozhiyuan3b497762015-05-19 17:21:00 +0800621 return sf.f_bsize * sf.f_bavail;
Doug Zongker512536a2010-02-17 16:11:44 -0800622}
623
Doug Zongkerc4351c72010-02-22 14:46:32 -0800624int CacheSizeCheck(size_t bytes) {
625 if (MakeFreeSpaceOnCache(bytes) < 0) {
626 printf("unable to make %ld bytes available on /cache\n", (long)bytes);
627 return 1;
628 } else {
629 return 0;
630 }
631}
632
Doug Zongkerc4351c72010-02-22 14:46:32 -0800633// This function applies binary patches to files in a way that is safe
Doug Zongker512536a2010-02-17 16:11:44 -0800634// (the original file is not touched until we have the desired
635// replacement for it) and idempotent (it's okay to run this program
636// multiple times).
637//
Doug Zongkerc4351c72010-02-22 14:46:32 -0800638// - if the sha1 hash of <target_filename> is <target_sha1_string>,
639// does nothing and exits successfully.
Doug Zongker512536a2010-02-17 16:11:44 -0800640//
Doug Zongkerc4351c72010-02-22 14:46:32 -0800641// - otherwise, if the sha1 hash of <source_filename> is one of the
642// entries in <patch_sha1_str>, the corresponding patch from
643// <patch_data> (which must be a VAL_BLOB) is applied to produce a
644// new file (the type of patch is automatically detected from the
Tao Baoabba55b2015-07-17 18:11:12 -0700645// blob data). If that new file has sha1 hash <target_sha1_str>,
Doug Zongkerc4351c72010-02-22 14:46:32 -0800646// moves it to replace <target_filename>, and exits successfully.
647// Note that if <source_filename> and <target_filename> are not the
648// same, <source_filename> is NOT deleted on success.
649// <target_filename> may be the string "-" to mean "the same as
650// source_filename".
Doug Zongker512536a2010-02-17 16:11:44 -0800651//
652// - otherwise, or if any error is encountered, exits with non-zero
653// status.
654//
Doug Zongkerf291d852010-07-07 13:55:25 -0700655// <source_filename> may refer to a partition to read the source data.
Tao Baoabba55b2015-07-17 18:11:12 -0700656// See the comments for the LoadPartitionContents() function above
Doug Zongkerc4351c72010-02-22 14:46:32 -0800657// for the format of such a filename.
Doug Zongker512536a2010-02-17 16:11:44 -0800658
Doug Zongkerc4351c72010-02-22 14:46:32 -0800659int applypatch(const char* source_filename,
660 const char* target_filename,
661 const char* target_sha1_str,
662 size_t target_size,
663 int num_patches,
664 char** const patch_sha1_str,
Doug Zongkera3ccba62012-08-20 15:28:02 -0700665 Value** patch_data,
666 Value* bonus_data) {
Doug Zongkerbf80f492012-10-19 12:24:26 -0700667 printf("patch %s: ", source_filename);
Doug Zongker512536a2010-02-17 16:11:44 -0800668
Tao Baoba9a42a2015-06-23 23:23:33 -0700669 if (target_filename[0] == '-' && target_filename[1] == '\0') {
Doug Zongkerc4351c72010-02-22 14:46:32 -0800670 target_filename = source_filename;
Doug Zongker512536a2010-02-17 16:11:44 -0800671 }
672
Doug Zongkerc4351c72010-02-22 14:46:32 -0800673 uint8_t target_sha1[SHA_DIGEST_SIZE];
674 if (ParseSha1(target_sha1_str, target_sha1) != 0) {
675 printf("failed to parse tgt-sha1 \"%s\"\n", target_sha1_str);
Doug Zongker512536a2010-02-17 16:11:44 -0800676 return 1;
Doug Zongkerc4351c72010-02-22 14:46:32 -0800677 }
Doug Zongker512536a2010-02-17 16:11:44 -0800678
Doug Zongkerc4351c72010-02-22 14:46:32 -0800679 FileContents copy_file;
680 FileContents source_file;
Doug Zongker1c43c972012-02-28 11:07:09 -0800681 copy_file.data = NULL;
682 source_file.data = NULL;
Doug Zongkerc4351c72010-02-22 14:46:32 -0800683 const Value* source_patch_value = NULL;
684 const Value* copy_patch_value = NULL;
Doug Zongker512536a2010-02-17 16:11:44 -0800685
Doug Zongkerc4351c72010-02-22 14:46:32 -0800686 // We try to load the target file into the source_file object.
Doug Zongkera1bc1482014-02-13 15:18:19 -0800687 if (LoadFileContents(target_filename, &source_file) == 0) {
Doug Zongkerc4351c72010-02-22 14:46:32 -0800688 if (memcmp(source_file.sha1, target_sha1, SHA_DIGEST_SIZE) == 0) {
689 // The early-exit case: the patch was already applied, this file
690 // has the desired hash, nothing for us to do.
Tao Baoabba55b2015-07-17 18:11:12 -0700691 printf("already %s\n", short_sha1(target_sha1).c_str());
Doug Zongker1c43c972012-02-28 11:07:09 -0800692 free(source_file.data);
Doug Zongkerc4351c72010-02-22 14:46:32 -0800693 return 0;
694 }
695 }
Doug Zongker512536a2010-02-17 16:11:44 -0800696
Doug Zongkerc4351c72010-02-22 14:46:32 -0800697 if (source_file.data == NULL ||
698 (target_filename != source_filename &&
699 strcmp(target_filename, source_filename) != 0)) {
700 // Need to load the source file: either we failed to load the
701 // target file, or we did but it's different from the source file.
702 free(source_file.data);
Doug Zongker1c43c972012-02-28 11:07:09 -0800703 source_file.data = NULL;
Doug Zongkera1bc1482014-02-13 15:18:19 -0800704 LoadFileContents(source_filename, &source_file);
Doug Zongkerc4351c72010-02-22 14:46:32 -0800705 }
706
707 if (source_file.data != NULL) {
Tao Baoba9a42a2015-06-23 23:23:33 -0700708 int to_use = FindMatchingPatch(source_file.sha1, patch_sha1_str, num_patches);
Doug Zongkerc4351c72010-02-22 14:46:32 -0800709 if (to_use >= 0) {
710 source_patch_value = patch_data[to_use];
711 }
712 }
713
714 if (source_patch_value == NULL) {
715 free(source_file.data);
Doug Zongker1c43c972012-02-28 11:07:09 -0800716 source_file.data = NULL;
Doug Zongkerc4351c72010-02-22 14:46:32 -0800717 printf("source file is bad; trying copy\n");
718
Doug Zongkera1bc1482014-02-13 15:18:19 -0800719 if (LoadFileContents(CACHE_TEMP_SOURCE, &copy_file) < 0) {
Doug Zongkerc4351c72010-02-22 14:46:32 -0800720 // fail.
721 printf("failed to read copy file\n");
722 return 1;
Doug Zongker512536a2010-02-17 16:11:44 -0800723 }
724
Tao Baoba9a42a2015-06-23 23:23:33 -0700725 int to_use = FindMatchingPatch(copy_file.sha1, patch_sha1_str, num_patches);
Doug Zongker8cd9e4f2010-08-12 17:38:09 -0700726 if (to_use >= 0) {
Doug Zongkerc4351c72010-02-22 14:46:32 -0800727 copy_patch_value = patch_data[to_use];
Doug Zongker512536a2010-02-17 16:11:44 -0800728 }
729
Doug Zongkerc4351c72010-02-22 14:46:32 -0800730 if (copy_patch_value == NULL) {
731 // fail.
732 printf("copy file doesn't match source SHA-1s either\n");
Doug Zongker1c43c972012-02-28 11:07:09 -0800733 free(copy_file.data);
Doug Zongkerc4351c72010-02-22 14:46:32 -0800734 return 1;
Doug Zongker512536a2010-02-17 16:11:44 -0800735 }
Doug Zongker512536a2010-02-17 16:11:44 -0800736 }
737
Doug Zongker1c43c972012-02-28 11:07:09 -0800738 int result = GenerateTarget(&source_file, source_patch_value,
739 &copy_file, copy_patch_value,
740 source_filename, target_filename,
Doug Zongkera3ccba62012-08-20 15:28:02 -0700741 target_sha1, target_size, bonus_data);
Doug Zongker1c43c972012-02-28 11:07:09 -0800742 free(source_file.data);
743 free(copy_file.data);
744
745 return result;
746}
747
Tao Baoabba55b2015-07-17 18:11:12 -0700748/*
749 * This function flashes a given image to the target partition. It verifies
750 * the target cheksum first, and will return if target has the desired hash.
751 * It checks the checksum of the given source image before flashing, and
752 * verifies the target partition afterwards. The function is idempotent.
753 * Returns zero on success.
754 */
755int applypatch_flash(const char* source_filename, const char* target_filename,
756 const char* target_sha1_str, size_t target_size) {
757 printf("flash %s: ", target_filename);
758
759 uint8_t target_sha1[SHA_DIGEST_SIZE];
760 if (ParseSha1(target_sha1_str, target_sha1) != 0) {
761 printf("failed to parse tgt-sha1 \"%s\"\n", target_sha1_str);
762 return 1;
763 }
764
765 FileContents source_file;
766 source_file.data = NULL;
767 std::string target_str(target_filename);
768
769 std::vector<std::string> pieces = android::base::Split(target_str, ":");
770 if (pieces.size() != 2 || (pieces[0] != "MTD" && pieces[0] != "EMMC")) {
771 printf("invalid target name \"%s\"", target_filename);
772 return 1;
773 }
774
775 // Load the target into the source_file object to see if already applied.
776 pieces.push_back(std::to_string(target_size));
777 pieces.push_back(target_sha1_str);
778 std::string fullname = android::base::Join(pieces, ':');
779 if (LoadPartitionContents(fullname.c_str(), &source_file) == 0 &&
780 memcmp(source_file.sha1, target_sha1, SHA_DIGEST_SIZE) == 0) {
781 // The early-exit case: the image was already applied, this partition
782 // has the desired hash, nothing for us to do.
783 printf("already %s\n", short_sha1(target_sha1).c_str());
784 free(source_file.data);
785 return 0;
786 }
787
788 if (LoadFileContents(source_filename, &source_file) == 0) {
789 if (memcmp(source_file.sha1, target_sha1, SHA_DIGEST_SIZE) != 0) {
790 // The source doesn't have desired checksum.
791 printf("source \"%s\" doesn't have expected sha1 sum\n", source_filename);
792 printf("expected: %s, found: %s\n", short_sha1(target_sha1).c_str(),
793 short_sha1(source_file.sha1).c_str());
794 free(source_file.data);
795 return 1;
796 }
797 }
798
799 if (WriteToPartition(source_file.data, target_size, target_filename) != 0) {
800 printf("write of copied data to %s failed\n", target_filename);
801 free(source_file.data);
802 return 1;
803 }
804
805 free(source_file.data);
806 return 0;
807}
808
Doug Zongker1c43c972012-02-28 11:07:09 -0800809static int GenerateTarget(FileContents* source_file,
810 const Value* source_patch_value,
811 FileContents* copy_file,
812 const Value* copy_patch_value,
813 const char* source_filename,
814 const char* target_filename,
815 const uint8_t target_sha1[SHA_DIGEST_SIZE],
Doug Zongkera3ccba62012-08-20 15:28:02 -0700816 size_t target_size,
817 const Value* bonus_data) {
Doug Zongkerc4351c72010-02-22 14:46:32 -0800818 int retry = 1;
819 SHA_CTX ctx;
820 int output;
821 MemorySinkInfo msi;
822 FileContents* source_to_use;
823 char* outname;
Doug Zongker1c43c972012-02-28 11:07:09 -0800824 int made_copy = 0;
Doug Zongkerc4351c72010-02-22 14:46:32 -0800825
826 // assume that target_filename (eg "/system/app/Foo.apk") is located
827 // on the same filesystem as its top-level directory ("/system").
828 // We need something that exists for calling statfs().
829 char target_fs[strlen(target_filename)+1];
830 char* slash = strchr(target_filename+1, '/');
831 if (slash != NULL) {
832 int count = slash - target_filename;
833 strncpy(target_fs, target_filename, count);
834 target_fs[count] = '\0';
Doug Zongker512536a2010-02-17 16:11:44 -0800835 } else {
Doug Zongkerc4351c72010-02-22 14:46:32 -0800836 strcpy(target_fs, target_filename);
Doug Zongker512536a2010-02-17 16:11:44 -0800837 }
838
Doug Zongkerc4351c72010-02-22 14:46:32 -0800839 do {
840 // Is there enough room in the target filesystem to hold the patched
841 // file?
842
Doug Zongkerf291d852010-07-07 13:55:25 -0700843 if (strncmp(target_filename, "MTD:", 4) == 0 ||
844 strncmp(target_filename, "EMMC:", 5) == 0) {
845 // If the target is a partition, we're actually going to
846 // write the output to /tmp and then copy it to the
847 // partition. statfs() always returns 0 blocks free for
848 // /tmp, so instead we'll just assume that /tmp has enough
849 // space to hold the file.
Doug Zongkerc4351c72010-02-22 14:46:32 -0800850
Doug Zongkerf291d852010-07-07 13:55:25 -0700851 // We still write the original source to cache, in case
852 // the partition write is interrupted.
Doug Zongker1c43c972012-02-28 11:07:09 -0800853 if (MakeFreeSpaceOnCache(source_file->size) < 0) {
Doug Zongkerc4351c72010-02-22 14:46:32 -0800854 printf("not enough free space on /cache\n");
855 return 1;
856 }
857 if (SaveFileContents(CACHE_TEMP_SOURCE, source_file) < 0) {
858 printf("failed to back up source file\n");
859 return 1;
860 }
861 made_copy = 1;
862 retry = 0;
863 } else {
864 int enough_space = 0;
865 if (retry > 0) {
866 size_t free_space = FreeSpaceForFile(target_fs);
Doug Zongker201cd462010-08-13 09:41:21 -0700867 enough_space =
868 (free_space > (256 << 10)) && // 256k (two-block) minimum
Doug Zongkerc4351c72010-02-22 14:46:32 -0800869 (free_space > (target_size * 3 / 2)); // 50% margin of error
Doug Zongkerbf80f492012-10-19 12:24:26 -0700870 if (!enough_space) {
Tao Baoba9a42a2015-06-23 23:23:33 -0700871 printf("target %zu bytes; free space %zu bytes; retry %d; enough %d\n",
872 target_size, free_space, retry, enough_space);
Doug Zongkerbf80f492012-10-19 12:24:26 -0700873 }
Doug Zongkerc4351c72010-02-22 14:46:32 -0800874 }
875
876 if (!enough_space) {
877 retry = 0;
878 }
879
880 if (!enough_space && source_patch_value != NULL) {
881 // Using the original source, but not enough free space. First
882 // copy the source file to cache, then delete it from the original
883 // location.
884
Doug Zongkerf291d852010-07-07 13:55:25 -0700885 if (strncmp(source_filename, "MTD:", 4) == 0 ||
886 strncmp(source_filename, "EMMC:", 5) == 0) {
Doug Zongkerc4351c72010-02-22 14:46:32 -0800887 // It's impossible to free space on the target filesystem by
Doug Zongkerf291d852010-07-07 13:55:25 -0700888 // deleting the source if the source is a partition. If
Doug Zongkerc4351c72010-02-22 14:46:32 -0800889 // we're ever in a state where we need to do this, fail.
Tao Baoba9a42a2015-06-23 23:23:33 -0700890 printf("not enough free space for target but source is partition\n");
Doug Zongkerc4351c72010-02-22 14:46:32 -0800891 return 1;
892 }
893
Doug Zongker1c43c972012-02-28 11:07:09 -0800894 if (MakeFreeSpaceOnCache(source_file->size) < 0) {
Doug Zongkerc4351c72010-02-22 14:46:32 -0800895 printf("not enough free space on /cache\n");
896 return 1;
897 }
898
899 if (SaveFileContents(CACHE_TEMP_SOURCE, source_file) < 0) {
900 printf("failed to back up source file\n");
901 return 1;
902 }
903 made_copy = 1;
904 unlink(source_filename);
905
906 size_t free_space = FreeSpaceForFile(target_fs);
Tao Baoba9a42a2015-06-23 23:23:33 -0700907 printf("(now %zu bytes free for target) ", free_space);
Doug Zongkerc4351c72010-02-22 14:46:32 -0800908 }
909 }
910
911 const Value* patch;
912 if (source_patch_value != NULL) {
Doug Zongker1c43c972012-02-28 11:07:09 -0800913 source_to_use = source_file;
Doug Zongkerc4351c72010-02-22 14:46:32 -0800914 patch = source_patch_value;
915 } else {
Doug Zongker1c43c972012-02-28 11:07:09 -0800916 source_to_use = copy_file;
Doug Zongkerc4351c72010-02-22 14:46:32 -0800917 patch = copy_patch_value;
918 }
919
920 if (patch->type != VAL_BLOB) {
921 printf("patch is not a blob\n");
922 return 1;
923 }
924
925 SinkFn sink = NULL;
926 void* token = NULL;
927 output = -1;
928 outname = NULL;
Doug Zongkerf291d852010-07-07 13:55:25 -0700929 if (strncmp(target_filename, "MTD:", 4) == 0 ||
930 strncmp(target_filename, "EMMC:", 5) == 0) {
Doug Zongkerc4351c72010-02-22 14:46:32 -0800931 // We store the decoded output in memory.
Tao Baoba9a42a2015-06-23 23:23:33 -0700932 msi.buffer = reinterpret_cast<unsigned char*>(malloc(target_size));
Doug Zongkerc4351c72010-02-22 14:46:32 -0800933 if (msi.buffer == NULL) {
Tao Baoba9a42a2015-06-23 23:23:33 -0700934 printf("failed to alloc %zu bytes for output\n", target_size);
Doug Zongkerc4351c72010-02-22 14:46:32 -0800935 return 1;
936 }
937 msi.pos = 0;
938 msi.size = target_size;
939 sink = MemorySink;
940 token = &msi;
941 } else {
942 // We write the decoded output to "<tgt-file>.patch".
Tao Baoba9a42a2015-06-23 23:23:33 -0700943 outname = reinterpret_cast<char*>(malloc(strlen(target_filename) + 10));
Doug Zongkerc4351c72010-02-22 14:46:32 -0800944 strcpy(outname, target_filename);
945 strcat(outname, ".patch");
946
Tao Baoba9a42a2015-06-23 23:23:33 -0700947 output = open(outname, O_WRONLY | O_CREAT | O_TRUNC | O_SYNC, S_IRUSR | S_IWUSR);
Doug Zongkerc4351c72010-02-22 14:46:32 -0800948 if (output < 0) {
949 printf("failed to open output file %s: %s\n",
950 outname, strerror(errno));
951 return 1;
952 }
953 sink = FileSink;
954 token = &output;
955 }
956
957 char* header = patch->data;
958 ssize_t header_bytes_read = patch->size;
959
960 SHA_init(&ctx);
961
962 int result;
963
964 if (header_bytes_read >= 8 &&
965 memcmp(header, "BSDIFF40", 8) == 0) {
966 result = ApplyBSDiffPatch(source_to_use->data, source_to_use->size,
967 patch, 0, sink, token, &ctx);
968 } else if (header_bytes_read >= 8 &&
969 memcmp(header, "IMGDIFF2", 8) == 0) {
970 result = ApplyImagePatch(source_to_use->data, source_to_use->size,
Doug Zongkera3ccba62012-08-20 15:28:02 -0700971 patch, sink, token, &ctx, bonus_data);
Doug Zongkerc4351c72010-02-22 14:46:32 -0800972 } else {
973 printf("Unknown patch file format\n");
974 return 1;
975 }
976
977 if (output >= 0) {
Michael Rungebe81e512014-10-29 12:42:15 -0700978 if (fsync(output) != 0) {
979 printf("failed to fsync file \"%s\" (%s)\n", outname, strerror(errno));
980 result = 1;
981 }
982 if (close(output) != 0) {
983 printf("failed to close file \"%s\" (%s)\n", outname, strerror(errno));
984 result = 1;
985 }
Doug Zongkerc4351c72010-02-22 14:46:32 -0800986 }
987
988 if (result != 0) {
989 if (retry == 0) {
990 printf("applying patch failed\n");
991 return result != 0;
992 } else {
993 printf("applying patch failed; retrying\n");
994 }
995 if (outname != NULL) {
996 unlink(outname);
997 }
998 } else {
999 // succeeded; no need to retry
1000 break;
1001 }
1002 } while (retry-- > 0);
1003
1004 const uint8_t* current_target_sha1 = SHA_final(&ctx);
1005 if (memcmp(current_target_sha1, target_sha1, SHA_DIGEST_SIZE) != 0) {
1006 printf("patch did not produce expected sha1\n");
Doug Zongker512536a2010-02-17 16:11:44 -08001007 return 1;
Doug Zongkerbf80f492012-10-19 12:24:26 -07001008 } else {
Tao Baoabba55b2015-07-17 18:11:12 -07001009 printf("now %s\n", short_sha1(target_sha1).c_str());
Doug Zongkerc4351c72010-02-22 14:46:32 -08001010 }
1011
1012 if (output < 0) {
Doug Zongkerf291d852010-07-07 13:55:25 -07001013 // Copy the temp file to the partition.
1014 if (WriteToPartition(msi.buffer, msi.pos, target_filename) != 0) {
Doug Zongkerc4351c72010-02-22 14:46:32 -08001015 printf("write of patched data to %s failed\n", target_filename);
1016 return 1;
1017 }
1018 free(msi.buffer);
Doug Zongker512536a2010-02-17 16:11:44 -08001019 } else {
Doug Zongkerc4351c72010-02-22 14:46:32 -08001020 // Give the .patch file the same owner, group, and mode of the
1021 // original source file.
1022 if (chmod(outname, source_to_use->st.st_mode) != 0) {
1023 printf("chmod of \"%s\" failed: %s\n", outname, strerror(errno));
1024 return 1;
1025 }
Tao Baoba9a42a2015-06-23 23:23:33 -07001026 if (chown(outname, source_to_use->st.st_uid, source_to_use->st.st_gid) != 0) {
Doug Zongkerc4351c72010-02-22 14:46:32 -08001027 printf("chown of \"%s\" failed: %s\n", outname, strerror(errno));
1028 return 1;
1029 }
Doug Zongker512536a2010-02-17 16:11:44 -08001030
Doug Zongkerc4351c72010-02-22 14:46:32 -08001031 // Finally, rename the .patch file to replace the target file.
1032 if (rename(outname, target_filename) != 0) {
Tao Baoba9a42a2015-06-23 23:23:33 -07001033 printf("rename of .patch to \"%s\" failed: %s\n", target_filename, strerror(errno));
Doug Zongkerc4351c72010-02-22 14:46:32 -08001034 return 1;
1035 }
Doug Zongker512536a2010-02-17 16:11:44 -08001036 }
1037
Doug Zongkerc4351c72010-02-22 14:46:32 -08001038 // If this run of applypatch created the copy, and we're here, we
1039 // can delete it.
Tao Baoba9a42a2015-06-23 23:23:33 -07001040 if (made_copy) {
1041 unlink(CACHE_TEMP_SOURCE);
1042 }
Doug Zongker512536a2010-02-17 16:11:44 -08001043
Doug Zongkerc4351c72010-02-22 14:46:32 -08001044 // Success!
1045 return 0;
Doug Zongker512536a2010-02-17 16:11:44 -08001046}