blob: 9e631dd4fbae7c972930c2f854fc022f10bf6ef2 [file] [log] [blame]
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>
18#include <libgen.h>
19#include <stdio.h>
20#include <stdlib.h>
21#include <string.h>
22#include <sys/stat.h>
23#include <sys/statfs.h>
24#include <sys/types.h>
25#include <fcntl.h>
26#include <unistd.h>
27
28#include "mincrypt/sha.h"
29#include "applypatch.h"
30#include "mtdutils/mtdutils.h"
Doug Zongkerc4351c72010-02-22 14:46:32 -080031#include "edify/expr.h"
Doug Zongker512536a2010-02-17 16:11:44 -080032
Doug Zongkerf291d852010-07-07 13:55:25 -070033static int LoadPartitionContents(const char* filename, FileContents* file);
Doug Zongkerf291d852010-07-07 13:55:25 -070034static ssize_t FileSink(unsigned char* data, ssize_t len, void* token);
Doug Zongker1c43c972012-02-28 11:07:09 -080035static int GenerateTarget(FileContents* source_file,
36 const Value* source_patch_value,
37 FileContents* copy_file,
38 const Value* copy_patch_value,
39 const char* source_filename,
40 const char* target_filename,
41 const uint8_t target_sha1[SHA_DIGEST_SIZE],
Doug Zongkera3ccba62012-08-20 15:28:02 -070042 size_t target_size,
43 const Value* bonus_data);
Doug Zongker512536a2010-02-17 16:11:44 -080044
45static int mtd_partitions_scanned = 0;
46
Hristo Bojinovdb314d62010-08-02 10:29:49 -070047// Read a file into memory; optionally (retouch_flag == RETOUCH_DO_MASK) mask
48// the retouched entries back to their original value (such that SHA-1 checks
49// don't fail due to randomization); store the file contents and associated
50// metadata in *file.
51//
52// Return 0 on success.
53int LoadFileContents(const char* filename, FileContents* file,
54 int retouch_flag) {
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;
70 file->data = malloc(file->size);
71
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
80 ssize_t bytes_read = fread(file->data, 1, file->size, f);
81 if (bytes_read != file->size) {
82 printf("short read of \"%s\" (%ld bytes of %ld)\n",
83 filename, (long)bytes_read, (long)file->size);
84 free(file->data);
85 file->data = NULL;
86 return -1;
87 }
88 fclose(f);
89
Hristo Bojinovdb314d62010-08-02 10:29:49 -070090 // apply_patch[_check] functions are blind to randomization. Randomization
91 // is taken care of in [Undo]RetouchBinariesFn. If there is a mismatch
92 // within a file, this means the file is assumed "corrupt" for simplicity.
93 if (retouch_flag) {
94 int32_t desired_offset = 0;
95 if (retouch_mask_data(file->data, file->size,
96 &desired_offset, NULL) != RETOUCH_DATA_MATCHED) {
97 printf("error trying to mask retouch entries\n");
98 free(file->data);
99 file->data = NULL;
100 return -1;
101 }
102 }
103
Doug Zongkerbac7fba2013-04-10 11:32:17 -0700104 SHA_hash(file->data, file->size, file->sha1);
Doug Zongkerc4351c72010-02-22 14:46:32 -0800105 return 0;
Doug Zongker512536a2010-02-17 16:11:44 -0800106}
107
108static size_t* size_array;
109// comparison function for qsort()ing an int array of indexes into
110// size_array[].
111static int compare_size_indices(const void* a, const void* b) {
Doug Zongkerc4351c72010-02-22 14:46:32 -0800112 int aa = *(int*)a;
113 int bb = *(int*)b;
114 if (size_array[aa] < size_array[bb]) {
115 return -1;
116 } else if (size_array[aa] > size_array[bb]) {
117 return 1;
118 } else {
119 return 0;
120 }
Doug Zongker512536a2010-02-17 16:11:44 -0800121}
122
Doug Zongkerf291d852010-07-07 13:55:25 -0700123// Load the contents of an MTD or EMMC partition into the provided
Doug Zongker512536a2010-02-17 16:11:44 -0800124// FileContents. filename should be a string of the form
Doug Zongkerf291d852010-07-07 13:55:25 -0700125// "MTD:<partition_name>:<size_1>:<sha1_1>:<size_2>:<sha1_2>:..." (or
126// "EMMC:<partition_device>:..."). The smallest size_n bytes for
127// which that prefix of the partition contents has the corresponding
128// sha1 hash will be loaded. It is acceptable for a size value to be
129// repeated with different sha1s. Will return 0 on success.
Doug Zongker512536a2010-02-17 16:11:44 -0800130//
131// This complexity is needed because if an OTA installation is
132// interrupted, the partition might contain either the source or the
133// target data, which might be of different lengths. We need to know
Doug Zongkerf291d852010-07-07 13:55:25 -0700134// the length in order to read from a partition (there is no
135// "end-of-file" marker), so the caller must specify the possible
136// lengths and the hash of the data, and we'll do the load expecting
137// to find one of those hashes.
138enum PartitionType { MTD, EMMC };
139
140static int LoadPartitionContents(const char* filename, FileContents* file) {
Doug Zongkerc4351c72010-02-22 14:46:32 -0800141 char* copy = strdup(filename);
142 const char* magic = strtok(copy, ":");
Doug Zongkerf291d852010-07-07 13:55:25 -0700143
144 enum PartitionType type;
145
146 if (strcmp(magic, "MTD") == 0) {
147 type = MTD;
148 } else if (strcmp(magic, "EMMC") == 0) {
149 type = EMMC;
150 } else {
151 printf("LoadPartitionContents called with bad filename (%s)\n",
Doug Zongkerc4351c72010-02-22 14:46:32 -0800152 filename);
153 return -1;
Doug Zongker512536a2010-02-17 16:11:44 -0800154 }
Doug Zongkerc4351c72010-02-22 14:46:32 -0800155 const char* partition = strtok(NULL, ":");
Doug Zongker512536a2010-02-17 16:11:44 -0800156
Doug Zongkerc4351c72010-02-22 14:46:32 -0800157 int i;
158 int colons = 0;
159 for (i = 0; filename[i] != '\0'; ++i) {
160 if (filename[i] == ':') {
161 ++colons;
162 }
Doug Zongker512536a2010-02-17 16:11:44 -0800163 }
Doug Zongkerc4351c72010-02-22 14:46:32 -0800164 if (colons < 3 || colons%2 == 0) {
Doug Zongkerf291d852010-07-07 13:55:25 -0700165 printf("LoadPartitionContents called with bad filename (%s)\n",
Doug Zongkerc4351c72010-02-22 14:46:32 -0800166 filename);
167 }
Doug Zongker512536a2010-02-17 16:11:44 -0800168
Doug Zongkerc4351c72010-02-22 14:46:32 -0800169 int pairs = (colons-1)/2; // # of (size,sha1) pairs in filename
170 int* index = malloc(pairs * sizeof(int));
171 size_t* size = malloc(pairs * sizeof(size_t));
172 char** sha1sum = malloc(pairs * sizeof(char*));
Doug Zongker512536a2010-02-17 16:11:44 -0800173
Doug Zongkerc4351c72010-02-22 14:46:32 -0800174 for (i = 0; i < pairs; ++i) {
175 const char* size_str = strtok(NULL, ":");
176 size[i] = strtol(size_str, NULL, 10);
177 if (size[i] == 0) {
Doug Zongkerf291d852010-07-07 13:55:25 -0700178 printf("LoadPartitionContents called with bad size (%s)\n", filename);
Doug Zongkerc4351c72010-02-22 14:46:32 -0800179 return -1;
180 }
181 sha1sum[i] = strtok(NULL, ":");
182 index[i] = i;
183 }
Doug Zongker512536a2010-02-17 16:11:44 -0800184
Doug Zongkerc4351c72010-02-22 14:46:32 -0800185 // sort the index[] array so it indexes the pairs in order of
186 // increasing size.
187 size_array = size;
188 qsort(index, pairs, sizeof(int), compare_size_indices);
Doug Zongker512536a2010-02-17 16:11:44 -0800189
Doug Zongkerf291d852010-07-07 13:55:25 -0700190 MtdReadContext* ctx = NULL;
191 FILE* dev = NULL;
Doug Zongker512536a2010-02-17 16:11:44 -0800192
Doug Zongkerf291d852010-07-07 13:55:25 -0700193 switch (type) {
194 case MTD:
195 if (!mtd_partitions_scanned) {
196 mtd_scan_partitions();
197 mtd_partitions_scanned = 1;
198 }
Doug Zongker512536a2010-02-17 16:11:44 -0800199
Doug Zongkerf291d852010-07-07 13:55:25 -0700200 const MtdPartition* mtd = mtd_find_partition_by_name(partition);
201 if (mtd == NULL) {
202 printf("mtd partition \"%s\" not found (loading %s)\n",
203 partition, filename);
204 return -1;
205 }
206
207 ctx = mtd_read_partition(mtd);
208 if (ctx == NULL) {
209 printf("failed to initialize read of mtd partition \"%s\"\n",
210 partition);
211 return -1;
212 }
213 break;
214
215 case EMMC:
216 dev = fopen(partition, "rb");
217 if (dev == NULL) {
218 printf("failed to open emmc partition \"%s\": %s\n",
219 partition, strerror(errno));
220 return -1;
221 }
Doug Zongkerc4351c72010-02-22 14:46:32 -0800222 }
Doug Zongker512536a2010-02-17 16:11:44 -0800223
Doug Zongkerc4351c72010-02-22 14:46:32 -0800224 SHA_CTX sha_ctx;
225 SHA_init(&sha_ctx);
226 uint8_t parsed_sha[SHA_DIGEST_SIZE];
227
228 // allocate enough memory to hold the largest size.
229 file->data = malloc(size[index[pairs-1]]);
230 char* p = (char*)file->data;
231 file->size = 0; // # bytes read so far
232
233 for (i = 0; i < pairs; ++i) {
234 // Read enough additional bytes to get us up to the next size
235 // (again, we're trying the possibilities in order of increasing
236 // size).
237 size_t next = size[index[i]] - file->size;
238 size_t read = 0;
239 if (next > 0) {
Doug Zongkerf291d852010-07-07 13:55:25 -0700240 switch (type) {
241 case MTD:
242 read = mtd_read_data(ctx, p, next);
243 break;
244
245 case EMMC:
246 read = fread(p, 1, next, dev);
247 break;
248 }
Doug Zongkerc4351c72010-02-22 14:46:32 -0800249 if (next != read) {
Mark Salyzynf3bb31c2014-03-14 09:39:48 -0700250 printf("short read (%zu bytes of %zu) for partition \"%s\"\n",
Doug Zongkerc4351c72010-02-22 14:46:32 -0800251 read, next, partition);
252 free(file->data);
253 file->data = NULL;
254 return -1;
255 }
256 SHA_update(&sha_ctx, p, read);
257 file->size += read;
258 }
259
260 // Duplicate the SHA context and finalize the duplicate so we can
261 // check it against this pair's expected hash.
262 SHA_CTX temp_ctx;
263 memcpy(&temp_ctx, &sha_ctx, sizeof(SHA_CTX));
264 const uint8_t* sha_so_far = SHA_final(&temp_ctx);
265
266 if (ParseSha1(sha1sum[index[i]], parsed_sha) != 0) {
267 printf("failed to parse sha1 %s in %s\n",
268 sha1sum[index[i]], filename);
269 free(file->data);
270 file->data = NULL;
271 return -1;
272 }
273
274 if (memcmp(sha_so_far, parsed_sha, SHA_DIGEST_SIZE) == 0) {
275 // we have a match. stop reading the partition; we'll return
276 // the data we've read so far.
Mark Salyzynf3bb31c2014-03-14 09:39:48 -0700277 printf("partition read matched size %zu sha %s\n",
Doug Zongkerc4351c72010-02-22 14:46:32 -0800278 size[index[i]], sha1sum[index[i]]);
279 break;
280 }
281
282 p += read;
283 }
284
Doug Zongkerf291d852010-07-07 13:55:25 -0700285 switch (type) {
286 case MTD:
287 mtd_read_close(ctx);
288 break;
289
290 case EMMC:
291 fclose(dev);
292 break;
293 }
294
Doug Zongkerc4351c72010-02-22 14:46:32 -0800295
296 if (i == pairs) {
297 // Ran off the end of the list of (size,sha1) pairs without
298 // finding a match.
Doug Zongkerf291d852010-07-07 13:55:25 -0700299 printf("contents of partition \"%s\" didn't match %s\n",
Doug Zongkerc4351c72010-02-22 14:46:32 -0800300 partition, filename);
Doug Zongker512536a2010-02-17 16:11:44 -0800301 free(file->data);
302 file->data = NULL;
303 return -1;
Doug Zongker512536a2010-02-17 16:11:44 -0800304 }
305
Doug Zongkerc4351c72010-02-22 14:46:32 -0800306 const uint8_t* sha_final = SHA_final(&sha_ctx);
307 for (i = 0; i < SHA_DIGEST_SIZE; ++i) {
308 file->sha1[i] = sha_final[i];
Doug Zongker512536a2010-02-17 16:11:44 -0800309 }
310
Doug Zongkerc4351c72010-02-22 14:46:32 -0800311 // Fake some stat() info.
312 file->st.st_mode = 0644;
313 file->st.st_uid = 0;
314 file->st.st_gid = 0;
Doug Zongker512536a2010-02-17 16:11:44 -0800315
Doug Zongkerc4351c72010-02-22 14:46:32 -0800316 free(copy);
317 free(index);
318 free(size);
319 free(sha1sum);
Doug Zongker512536a2010-02-17 16:11:44 -0800320
Doug Zongkerc4351c72010-02-22 14:46:32 -0800321 return 0;
Doug Zongker512536a2010-02-17 16:11:44 -0800322}
323
324
325// Save the contents of the given FileContents object under the given
326// filename. Return 0 on success.
Doug Zongker1c43c972012-02-28 11:07:09 -0800327int SaveFileContents(const char* filename, const FileContents* file) {
Nick Kralevich956cde82012-06-26 15:01:03 -0700328 int fd = open(filename, O_WRONLY | O_CREAT | O_TRUNC, S_IRUSR | S_IWUSR);
Doug Zongkerc4351c72010-02-22 14:46:32 -0800329 if (fd < 0) {
330 printf("failed to open \"%s\" for write: %s\n",
331 filename, strerror(errno));
332 return -1;
333 }
Doug Zongker512536a2010-02-17 16:11:44 -0800334
Doug Zongker1c43c972012-02-28 11:07:09 -0800335 ssize_t bytes_written = FileSink(file->data, file->size, &fd);
336 if (bytes_written != file->size) {
Doug Zongkerc4351c72010-02-22 14:46:32 -0800337 printf("short write of \"%s\" (%ld bytes of %ld) (%s)\n",
Doug Zongker1c43c972012-02-28 11:07:09 -0800338 filename, (long)bytes_written, (long)file->size,
Doug Zongkerc4351c72010-02-22 14:46:32 -0800339 strerror(errno));
340 close(fd);
341 return -1;
342 }
343 fsync(fd);
Doug Zongker512536a2010-02-17 16:11:44 -0800344 close(fd);
Doug Zongker512536a2010-02-17 16:11:44 -0800345
Doug Zongker1c43c972012-02-28 11:07:09 -0800346 if (chmod(filename, file->st.st_mode) != 0) {
Doug Zongkerc4351c72010-02-22 14:46:32 -0800347 printf("chmod of \"%s\" failed: %s\n", filename, strerror(errno));
348 return -1;
349 }
Doug Zongker1c43c972012-02-28 11:07:09 -0800350 if (chown(filename, file->st.st_uid, file->st.st_gid) != 0) {
Doug Zongkerc4351c72010-02-22 14:46:32 -0800351 printf("chown of \"%s\" failed: %s\n", filename, strerror(errno));
352 return -1;
353 }
Doug Zongker512536a2010-02-17 16:11:44 -0800354
Doug Zongkerc4351c72010-02-22 14:46:32 -0800355 return 0;
Doug Zongker512536a2010-02-17 16:11:44 -0800356}
357
Doug Zongkerf291d852010-07-07 13:55:25 -0700358// Write a memory buffer to 'target' partition, a string of the form
359// "MTD:<partition>[:...]" or "EMMC:<partition_device>:". Return 0 on
360// success.
361int WriteToPartition(unsigned char* data, size_t len,
362 const char* target) {
363 char* copy = strdup(target);
364 const char* magic = strtok(copy, ":");
365
366 enum PartitionType type;
367 if (strcmp(magic, "MTD") == 0) {
368 type = MTD;
369 } else if (strcmp(magic, "EMMC") == 0) {
370 type = EMMC;
371 } else {
372 printf("WriteToPartition called with bad target (%s)\n", target);
373 return -1;
374 }
375 const char* partition = strtok(NULL, ":");
376
Doug Zongkerc4351c72010-02-22 14:46:32 -0800377 if (partition == NULL) {
Doug Zongkerf291d852010-07-07 13:55:25 -0700378 printf("bad partition target name \"%s\"\n", target);
Doug Zongkerc4351c72010-02-22 14:46:32 -0800379 return -1;
380 }
Doug Zongker512536a2010-02-17 16:11:44 -0800381
Doug Zongkerf291d852010-07-07 13:55:25 -0700382 switch (type) {
383 case MTD:
384 if (!mtd_partitions_scanned) {
385 mtd_scan_partitions();
386 mtd_partitions_scanned = 1;
387 }
388
389 const MtdPartition* mtd = mtd_find_partition_by_name(partition);
390 if (mtd == NULL) {
391 printf("mtd partition \"%s\" not found for writing\n",
392 partition);
393 return -1;
394 }
395
396 MtdWriteContext* ctx = mtd_write_partition(mtd);
397 if (ctx == NULL) {
398 printf("failed to init mtd partition \"%s\" for writing\n",
399 partition);
400 return -1;
401 }
402
403 size_t written = mtd_write_data(ctx, (char*)data, len);
404 if (written != len) {
Mark Salyzynf3bb31c2014-03-14 09:39:48 -0700405 printf("only wrote %zu of %zu bytes to MTD %s\n",
Doug Zongkerf291d852010-07-07 13:55:25 -0700406 written, len, partition);
407 mtd_write_close(ctx);
408 return -1;
409 }
410
411 if (mtd_erase_blocks(ctx, -1) < 0) {
412 printf("error finishing mtd write of %s\n", partition);
413 mtd_write_close(ctx);
414 return -1;
415 }
416
417 if (mtd_write_close(ctx)) {
418 printf("error closing mtd write of %s\n", partition);
419 return -1;
420 }
421 break;
422
423 case EMMC:
Doug Zongker044a0b42013-07-08 09:42:54 -0700424 {
425 size_t start = 0;
426 int success = 0;
Doug Zongker168724c2013-12-19 15:16:57 -0800427 int fd = open(partition, O_RDWR);
Doug Zongkerc870a992013-07-09 10:34:46 -0700428 if (fd < 0) {
Doug Zongker044a0b42013-07-08 09:42:54 -0700429 printf("failed to open %s: %s\n", partition, strerror(errno));
Doug Zongkerf291d852010-07-07 13:55:25 -0700430 return -1;
431 }
Doug Zongker044a0b42013-07-08 09:42:54 -0700432 int attempt;
433
Doug Zongker168724c2013-12-19 15:16:57 -0800434 for (attempt = 0; attempt < 2; ++attempt) {
Doug Zongkerc870a992013-07-09 10:34:46 -0700435 lseek(fd, start, SEEK_SET);
Doug Zongker044a0b42013-07-08 09:42:54 -0700436 while (start < len) {
437 size_t to_write = len - start;
Doug Zongker168724c2013-12-19 15:16:57 -0800438 if (to_write > 1<<20) to_write = 1<<20;
Doug Zongker044a0b42013-07-08 09:42:54 -0700439
Doug Zongkerc870a992013-07-09 10:34:46 -0700440 ssize_t written = write(fd, data+start, to_write);
441 if (written < 0) {
442 if (errno == EINTR) {
443 written = 0;
444 } else {
445 printf("failed write writing to %s (%s)\n",
446 partition, strerror(errno));
447 return -1;
448 }
Doug Zongker044a0b42013-07-08 09:42:54 -0700449 }
Doug Zongkerc870a992013-07-09 10:34:46 -0700450 start += written;
Doug Zongker044a0b42013-07-08 09:42:54 -0700451 }
Doug Zongkerc870a992013-07-09 10:34:46 -0700452 fsync(fd);
Doug Zongker044a0b42013-07-08 09:42:54 -0700453
454 // drop caches so our subsequent verification read
455 // won't just be reading the cache.
456 sync();
Doug Zongkerc870a992013-07-09 10:34:46 -0700457 int dc = open("/proc/sys/vm/drop_caches", O_WRONLY);
458 write(dc, "3\n", 2);
459 close(dc);
Doug Zongker044a0b42013-07-08 09:42:54 -0700460 sleep(1);
461 printf(" caches dropped\n");
462
463 // verify
Doug Zongkerc870a992013-07-09 10:34:46 -0700464 lseek(fd, 0, SEEK_SET);
Doug Zongker044a0b42013-07-08 09:42:54 -0700465 unsigned char buffer[4096];
466 start = len;
467 size_t p;
468 for (p = 0; p < len; p += sizeof(buffer)) {
469 size_t to_read = len - p;
470 if (to_read > sizeof(buffer)) to_read = sizeof(buffer);
471
Doug Zongkerc870a992013-07-09 10:34:46 -0700472 size_t so_far = 0;
473 while (so_far < to_read) {
474 ssize_t read_count = read(fd, buffer+so_far, to_read-so_far);
475 if (read_count < 0) {
476 if (errno == EINTR) {
477 read_count = 0;
478 } else {
Mark Salyzynf3bb31c2014-03-14 09:39:48 -0700479 printf("verify read error %s at %zu: %s\n",
Doug Zongkerc870a992013-07-09 10:34:46 -0700480 partition, p, strerror(errno));
481 return -1;
482 }
483 }
Doug Zongkerbf4a69a2013-07-10 13:39:50 -0700484 if ((size_t)read_count < to_read) {
Mark Salyzynf3bb31c2014-03-14 09:39:48 -0700485 printf("short verify read %s at %zu: %zd %zu %s\n",
Doug Zongkerc870a992013-07-09 10:34:46 -0700486 partition, p, read_count, to_read, strerror(errno));
487 }
488 so_far += read_count;
Doug Zongker044a0b42013-07-08 09:42:54 -0700489 }
490
491 if (memcmp(buffer, data+p, to_read)) {
Mark Salyzynf3bb31c2014-03-14 09:39:48 -0700492 printf("verification failed starting at %zu\n", p);
Doug Zongker044a0b42013-07-08 09:42:54 -0700493 start = p;
494 break;
495 }
496 }
497
498 if (start == len) {
499 printf("verification read succeeded (attempt %d)\n", attempt+1);
500 success = true;
501 break;
502 }
503 }
504
505 if (!success) {
506 printf("failed to verify after all attempts\n");
507 return -1;
508 }
509
Doug Zongkerc870a992013-07-09 10:34:46 -0700510 if (close(fd) != 0) {
Doug Zongkerf291d852010-07-07 13:55:25 -0700511 printf("error closing %s (%s)\n", partition, strerror(errno));
512 return -1;
513 }
Doug Zongkerbf4a69a2013-07-10 13:39:50 -0700514 sync();
Doug Zongkerf291d852010-07-07 13:55:25 -0700515 break;
Doug Zongker044a0b42013-07-08 09:42:54 -0700516 }
Doug Zongkerc4351c72010-02-22 14:46:32 -0800517 }
Doug Zongker512536a2010-02-17 16:11:44 -0800518
Doug Zongkerf291d852010-07-07 13:55:25 -0700519 free(copy);
Doug Zongkerc4351c72010-02-22 14:46:32 -0800520 return 0;
Doug Zongker512536a2010-02-17 16:11:44 -0800521}
522
523
524// Take a string 'str' of 40 hex digits and parse it into the 20
525// byte array 'digest'. 'str' may contain only the digest or be of
526// the form "<digest>:<anything>". Return 0 on success, -1 on any
527// error.
528int ParseSha1(const char* str, uint8_t* digest) {
Doug Zongkerc4351c72010-02-22 14:46:32 -0800529 int i;
530 const char* ps = str;
531 uint8_t* pd = digest;
532 for (i = 0; i < SHA_DIGEST_SIZE * 2; ++i, ++ps) {
533 int digit;
534 if (*ps >= '0' && *ps <= '9') {
535 digit = *ps - '0';
536 } else if (*ps >= 'a' && *ps <= 'f') {
537 digit = *ps - 'a' + 10;
538 } else if (*ps >= 'A' && *ps <= 'F') {
539 digit = *ps - 'A' + 10;
540 } else {
541 return -1;
542 }
543 if (i % 2 == 0) {
544 *pd = digit << 4;
545 } else {
546 *pd |= digit;
547 ++pd;
548 }
Doug Zongker512536a2010-02-17 16:11:44 -0800549 }
Doug Zongkerc4351c72010-02-22 14:46:32 -0800550 if (*ps != '\0') return -1;
551 return 0;
Doug Zongker512536a2010-02-17 16:11:44 -0800552}
553
Doug Zongkerc4351c72010-02-22 14:46:32 -0800554// Search an array of sha1 strings for one matching the given sha1.
555// Return the index of the match on success, or -1 if no match is
556// found.
Doug Zongker044a0b42013-07-08 09:42:54 -0700557int FindMatchingPatch(uint8_t* sha1, char* const * const patch_sha1_str,
Doug Zongkerc4351c72010-02-22 14:46:32 -0800558 int num_patches) {
559 int i;
560 uint8_t patch_sha1[SHA_DIGEST_SIZE];
561 for (i = 0; i < num_patches; ++i) {
562 if (ParseSha1(patch_sha1_str[i], patch_sha1) == 0 &&
563 memcmp(patch_sha1, sha1, SHA_DIGEST_SIZE) == 0) {
564 return i;
565 }
Doug Zongker512536a2010-02-17 16:11:44 -0800566 }
Doug Zongkerc4351c72010-02-22 14:46:32 -0800567 return -1;
Doug Zongker512536a2010-02-17 16:11:44 -0800568}
569
570// Returns 0 if the contents of the file (argv[2]) or the cached file
571// match any of the sha1's on the command line (argv[3:]). Returns
572// nonzero otherwise.
Doug Zongkerc4351c72010-02-22 14:46:32 -0800573int applypatch_check(const char* filename,
574 int num_patches, char** const patch_sha1_str) {
575 FileContents file;
576 file.data = NULL;
Doug Zongker512536a2010-02-17 16:11:44 -0800577
Doug Zongkerc4351c72010-02-22 14:46:32 -0800578 // It's okay to specify no sha1s; the check will pass if the
Doug Zongkerf291d852010-07-07 13:55:25 -0700579 // LoadFileContents is successful. (Useful for reading
Doug Zongkerc4351c72010-02-22 14:46:32 -0800580 // partitions, where the filename encodes the sha1s; no need to
581 // check them twice.)
Hristo Bojinovdb314d62010-08-02 10:29:49 -0700582 if (LoadFileContents(filename, &file, RETOUCH_DO_MASK) != 0 ||
Doug Zongkerc4351c72010-02-22 14:46:32 -0800583 (num_patches > 0 &&
584 FindMatchingPatch(file.sha1, patch_sha1_str, num_patches) < 0)) {
585 printf("file \"%s\" doesn't have any of expected "
586 "sha1 sums; checking cache\n", filename);
Doug Zongker512536a2010-02-17 16:11:44 -0800587
Doug Zongkerc4351c72010-02-22 14:46:32 -0800588 free(file.data);
Doug Zongker1c43c972012-02-28 11:07:09 -0800589 file.data = NULL;
Doug Zongker512536a2010-02-17 16:11:44 -0800590
Doug Zongkerc4351c72010-02-22 14:46:32 -0800591 // If the source file is missing or corrupted, it might be because
592 // we were killed in the middle of patching it. A copy of it
593 // should have been made in CACHE_TEMP_SOURCE. If that file
594 // exists and matches the sha1 we're looking for, the check still
595 // passes.
596
Hristo Bojinovdb314d62010-08-02 10:29:49 -0700597 if (LoadFileContents(CACHE_TEMP_SOURCE, &file, RETOUCH_DO_MASK) != 0) {
Doug Zongkerc4351c72010-02-22 14:46:32 -0800598 printf("failed to load cache file\n");
599 return 1;
600 }
601
602 if (FindMatchingPatch(file.sha1, patch_sha1_str, num_patches) < 0) {
603 printf("cache bits don't match any sha1 for \"%s\"\n", filename);
604 free(file.data);
605 return 1;
606 }
607 }
Doug Zongker512536a2010-02-17 16:11:44 -0800608
609 free(file.data);
Doug Zongkerc4351c72010-02-22 14:46:32 -0800610 return 0;
Doug Zongker512536a2010-02-17 16:11:44 -0800611}
612
613int ShowLicenses() {
Doug Zongkerc4351c72010-02-22 14:46:32 -0800614 ShowBSDiffLicense();
615 return 0;
Doug Zongker512536a2010-02-17 16:11:44 -0800616}
617
618ssize_t FileSink(unsigned char* data, ssize_t len, void* token) {
Doug Zongkerc4351c72010-02-22 14:46:32 -0800619 int fd = *(int *)token;
620 ssize_t done = 0;
621 ssize_t wrote;
622 while (done < (ssize_t) len) {
623 wrote = write(fd, data+done, len-done);
624 if (wrote <= 0) {
625 printf("error writing %d bytes: %s\n", (int)(len-done), strerror(errno));
626 return done;
627 }
628 done += wrote;
Doug Zongker512536a2010-02-17 16:11:44 -0800629 }
Doug Zongkerc4351c72010-02-22 14:46:32 -0800630 return done;
Doug Zongker512536a2010-02-17 16:11:44 -0800631}
632
633typedef struct {
Doug Zongkerc4351c72010-02-22 14:46:32 -0800634 unsigned char* buffer;
635 ssize_t size;
636 ssize_t pos;
Doug Zongker512536a2010-02-17 16:11:44 -0800637} MemorySinkInfo;
638
639ssize_t MemorySink(unsigned char* data, ssize_t len, void* token) {
Doug Zongkerc4351c72010-02-22 14:46:32 -0800640 MemorySinkInfo* msi = (MemorySinkInfo*)token;
641 if (msi->size - msi->pos < len) {
642 return -1;
643 }
644 memcpy(msi->buffer + msi->pos, data, len);
645 msi->pos += len;
646 return len;
Doug Zongker512536a2010-02-17 16:11:44 -0800647}
648
649// Return the amount of free space (in bytes) on the filesystem
650// containing filename. filename must exist. Return -1 on error.
651size_t FreeSpaceForFile(const char* filename) {
Doug Zongkerc4351c72010-02-22 14:46:32 -0800652 struct statfs sf;
653 if (statfs(filename, &sf) != 0) {
654 printf("failed to statfs %s: %s\n", filename, strerror(errno));
655 return -1;
656 }
657 return sf.f_bsize * sf.f_bfree;
Doug Zongker512536a2010-02-17 16:11:44 -0800658}
659
Doug Zongkerc4351c72010-02-22 14:46:32 -0800660int CacheSizeCheck(size_t bytes) {
661 if (MakeFreeSpaceOnCache(bytes) < 0) {
662 printf("unable to make %ld bytes available on /cache\n", (long)bytes);
663 return 1;
664 } else {
665 return 0;
666 }
667}
668
Doug Zongkerbf80f492012-10-19 12:24:26 -0700669static void print_short_sha1(const uint8_t sha1[SHA_DIGEST_SIZE]) {
670 int i;
671 const char* hex = "0123456789abcdef";
672 for (i = 0; i < 4; ++i) {
673 putchar(hex[(sha1[i]>>4) & 0xf]);
674 putchar(hex[sha1[i] & 0xf]);
675 }
676}
Doug Zongkerc4351c72010-02-22 14:46:32 -0800677
678// This function applies binary patches to files in a way that is safe
Doug Zongker512536a2010-02-17 16:11:44 -0800679// (the original file is not touched until we have the desired
680// replacement for it) and idempotent (it's okay to run this program
681// multiple times).
682//
Doug Zongkerc4351c72010-02-22 14:46:32 -0800683// - if the sha1 hash of <target_filename> is <target_sha1_string>,
684// does nothing and exits successfully.
Doug Zongker512536a2010-02-17 16:11:44 -0800685//
Doug Zongkerc4351c72010-02-22 14:46:32 -0800686// - otherwise, if the sha1 hash of <source_filename> is one of the
687// entries in <patch_sha1_str>, the corresponding patch from
688// <patch_data> (which must be a VAL_BLOB) is applied to produce a
689// new file (the type of patch is automatically detected from the
690// blob daat). If that new file has sha1 hash <target_sha1_str>,
691// moves it to replace <target_filename>, and exits successfully.
692// Note that if <source_filename> and <target_filename> are not the
693// same, <source_filename> is NOT deleted on success.
694// <target_filename> may be the string "-" to mean "the same as
695// source_filename".
Doug Zongker512536a2010-02-17 16:11:44 -0800696//
697// - otherwise, or if any error is encountered, exits with non-zero
698// status.
699//
Doug Zongkerf291d852010-07-07 13:55:25 -0700700// <source_filename> may refer to a partition to read the source data.
701// See the comments for the LoadPartition Contents() function above
Doug Zongkerc4351c72010-02-22 14:46:32 -0800702// for the format of such a filename.
Doug Zongker512536a2010-02-17 16:11:44 -0800703
Doug Zongkerc4351c72010-02-22 14:46:32 -0800704int applypatch(const char* source_filename,
705 const char* target_filename,
706 const char* target_sha1_str,
707 size_t target_size,
708 int num_patches,
709 char** const patch_sha1_str,
Doug Zongkera3ccba62012-08-20 15:28:02 -0700710 Value** patch_data,
711 Value* bonus_data) {
Doug Zongkerbf80f492012-10-19 12:24:26 -0700712 printf("patch %s: ", source_filename);
Doug Zongker512536a2010-02-17 16:11:44 -0800713
Doug Zongkerc4351c72010-02-22 14:46:32 -0800714 if (target_filename[0] == '-' &&
715 target_filename[1] == '\0') {
716 target_filename = source_filename;
Doug Zongker512536a2010-02-17 16:11:44 -0800717 }
718
Doug Zongkerc4351c72010-02-22 14:46:32 -0800719 uint8_t target_sha1[SHA_DIGEST_SIZE];
720 if (ParseSha1(target_sha1_str, target_sha1) != 0) {
721 printf("failed to parse tgt-sha1 \"%s\"\n", target_sha1_str);
Doug Zongker512536a2010-02-17 16:11:44 -0800722 return 1;
Doug Zongkerc4351c72010-02-22 14:46:32 -0800723 }
Doug Zongker512536a2010-02-17 16:11:44 -0800724
Doug Zongkerc4351c72010-02-22 14:46:32 -0800725 FileContents copy_file;
726 FileContents source_file;
Doug Zongker1c43c972012-02-28 11:07:09 -0800727 copy_file.data = NULL;
728 source_file.data = NULL;
Doug Zongkerc4351c72010-02-22 14:46:32 -0800729 const Value* source_patch_value = NULL;
730 const Value* copy_patch_value = NULL;
Doug Zongker512536a2010-02-17 16:11:44 -0800731
Doug Zongkerc4351c72010-02-22 14:46:32 -0800732 // We try to load the target file into the source_file object.
Hristo Bojinovdb314d62010-08-02 10:29:49 -0700733 if (LoadFileContents(target_filename, &source_file,
734 RETOUCH_DO_MASK) == 0) {
Doug Zongkerc4351c72010-02-22 14:46:32 -0800735 if (memcmp(source_file.sha1, target_sha1, SHA_DIGEST_SIZE) == 0) {
736 // The early-exit case: the patch was already applied, this file
737 // has the desired hash, nothing for us to do.
Doug Zongkerbf80f492012-10-19 12:24:26 -0700738 printf("already ");
739 print_short_sha1(target_sha1);
740 putchar('\n');
Doug Zongker1c43c972012-02-28 11:07:09 -0800741 free(source_file.data);
Doug Zongkerc4351c72010-02-22 14:46:32 -0800742 return 0;
743 }
744 }
Doug Zongker512536a2010-02-17 16:11:44 -0800745
Doug Zongkerc4351c72010-02-22 14:46:32 -0800746 if (source_file.data == NULL ||
747 (target_filename != source_filename &&
748 strcmp(target_filename, source_filename) != 0)) {
749 // Need to load the source file: either we failed to load the
750 // target file, or we did but it's different from the source file.
751 free(source_file.data);
Doug Zongker1c43c972012-02-28 11:07:09 -0800752 source_file.data = NULL;
Hristo Bojinovdb314d62010-08-02 10:29:49 -0700753 LoadFileContents(source_filename, &source_file,
754 RETOUCH_DO_MASK);
Doug Zongkerc4351c72010-02-22 14:46:32 -0800755 }
756
757 if (source_file.data != NULL) {
758 int to_use = FindMatchingPatch(source_file.sha1,
759 patch_sha1_str, num_patches);
760 if (to_use >= 0) {
761 source_patch_value = patch_data[to_use];
762 }
763 }
764
765 if (source_patch_value == NULL) {
766 free(source_file.data);
Doug Zongker1c43c972012-02-28 11:07:09 -0800767 source_file.data = NULL;
Doug Zongkerc4351c72010-02-22 14:46:32 -0800768 printf("source file is bad; trying copy\n");
769
Hristo Bojinovdb314d62010-08-02 10:29:49 -0700770 if (LoadFileContents(CACHE_TEMP_SOURCE, &copy_file,
771 RETOUCH_DO_MASK) < 0) {
Doug Zongkerc4351c72010-02-22 14:46:32 -0800772 // fail.
773 printf("failed to read copy file\n");
774 return 1;
Doug Zongker512536a2010-02-17 16:11:44 -0800775 }
776
Doug Zongkerc4351c72010-02-22 14:46:32 -0800777 int to_use = FindMatchingPatch(copy_file.sha1,
778 patch_sha1_str, num_patches);
Doug Zongker8cd9e4f2010-08-12 17:38:09 -0700779 if (to_use >= 0) {
Doug Zongkerc4351c72010-02-22 14:46:32 -0800780 copy_patch_value = patch_data[to_use];
Doug Zongker512536a2010-02-17 16:11:44 -0800781 }
782
Doug Zongkerc4351c72010-02-22 14:46:32 -0800783 if (copy_patch_value == NULL) {
784 // fail.
785 printf("copy file doesn't match source SHA-1s either\n");
Doug Zongker1c43c972012-02-28 11:07:09 -0800786 free(copy_file.data);
Doug Zongkerc4351c72010-02-22 14:46:32 -0800787 return 1;
Doug Zongker512536a2010-02-17 16:11:44 -0800788 }
Doug Zongker512536a2010-02-17 16:11:44 -0800789 }
790
Doug Zongker1c43c972012-02-28 11:07:09 -0800791 int result = GenerateTarget(&source_file, source_patch_value,
792 &copy_file, copy_patch_value,
793 source_filename, target_filename,
Doug Zongkera3ccba62012-08-20 15:28:02 -0700794 target_sha1, target_size, bonus_data);
Doug Zongker1c43c972012-02-28 11:07:09 -0800795 free(source_file.data);
796 free(copy_file.data);
797
798 return result;
799}
800
801static int GenerateTarget(FileContents* source_file,
802 const Value* source_patch_value,
803 FileContents* copy_file,
804 const Value* copy_patch_value,
805 const char* source_filename,
806 const char* target_filename,
807 const uint8_t target_sha1[SHA_DIGEST_SIZE],
Doug Zongkera3ccba62012-08-20 15:28:02 -0700808 size_t target_size,
809 const Value* bonus_data) {
Doug Zongkerc4351c72010-02-22 14:46:32 -0800810 int retry = 1;
811 SHA_CTX ctx;
812 int output;
813 MemorySinkInfo msi;
814 FileContents* source_to_use;
815 char* outname;
Doug Zongker1c43c972012-02-28 11:07:09 -0800816 int made_copy = 0;
Doug Zongkerc4351c72010-02-22 14:46:32 -0800817
818 // assume that target_filename (eg "/system/app/Foo.apk") is located
819 // on the same filesystem as its top-level directory ("/system").
820 // We need something that exists for calling statfs().
821 char target_fs[strlen(target_filename)+1];
822 char* slash = strchr(target_filename+1, '/');
823 if (slash != NULL) {
824 int count = slash - target_filename;
825 strncpy(target_fs, target_filename, count);
826 target_fs[count] = '\0';
Doug Zongker512536a2010-02-17 16:11:44 -0800827 } else {
Doug Zongkerc4351c72010-02-22 14:46:32 -0800828 strcpy(target_fs, target_filename);
Doug Zongker512536a2010-02-17 16:11:44 -0800829 }
830
Doug Zongkerc4351c72010-02-22 14:46:32 -0800831 do {
832 // Is there enough room in the target filesystem to hold the patched
833 // file?
834
Doug Zongkerf291d852010-07-07 13:55:25 -0700835 if (strncmp(target_filename, "MTD:", 4) == 0 ||
836 strncmp(target_filename, "EMMC:", 5) == 0) {
837 // If the target is a partition, we're actually going to
838 // write the output to /tmp and then copy it to the
839 // partition. statfs() always returns 0 blocks free for
840 // /tmp, so instead we'll just assume that /tmp has enough
841 // space to hold the file.
Doug Zongkerc4351c72010-02-22 14:46:32 -0800842
Doug Zongkerf291d852010-07-07 13:55:25 -0700843 // We still write the original source to cache, in case
844 // the partition write is interrupted.
Doug Zongker1c43c972012-02-28 11:07:09 -0800845 if (MakeFreeSpaceOnCache(source_file->size) < 0) {
Doug Zongkerc4351c72010-02-22 14:46:32 -0800846 printf("not enough free space on /cache\n");
847 return 1;
848 }
849 if (SaveFileContents(CACHE_TEMP_SOURCE, source_file) < 0) {
850 printf("failed to back up source file\n");
851 return 1;
852 }
853 made_copy = 1;
854 retry = 0;
855 } else {
856 int enough_space = 0;
857 if (retry > 0) {
858 size_t free_space = FreeSpaceForFile(target_fs);
Doug Zongker201cd462010-08-13 09:41:21 -0700859 enough_space =
860 (free_space > (256 << 10)) && // 256k (two-block) minimum
Doug Zongkerc4351c72010-02-22 14:46:32 -0800861 (free_space > (target_size * 3 / 2)); // 50% margin of error
Doug Zongkerbf80f492012-10-19 12:24:26 -0700862 if (!enough_space) {
863 printf("target %ld bytes; free space %ld bytes; retry %d; enough %d\n",
864 (long)target_size, (long)free_space, retry, enough_space);
865 }
Doug Zongkerc4351c72010-02-22 14:46:32 -0800866 }
867
868 if (!enough_space) {
869 retry = 0;
870 }
871
872 if (!enough_space && source_patch_value != NULL) {
873 // Using the original source, but not enough free space. First
874 // copy the source file to cache, then delete it from the original
875 // location.
876
Doug Zongkerf291d852010-07-07 13:55:25 -0700877 if (strncmp(source_filename, "MTD:", 4) == 0 ||
878 strncmp(source_filename, "EMMC:", 5) == 0) {
Doug Zongkerc4351c72010-02-22 14:46:32 -0800879 // It's impossible to free space on the target filesystem by
Doug Zongkerf291d852010-07-07 13:55:25 -0700880 // deleting the source if the source is a partition. If
Doug Zongkerc4351c72010-02-22 14:46:32 -0800881 // we're ever in a state where we need to do this, fail.
Doug Zongkerf291d852010-07-07 13:55:25 -0700882 printf("not enough free space for target but source "
883 "is partition\n");
Doug Zongkerc4351c72010-02-22 14:46:32 -0800884 return 1;
885 }
886
Doug Zongker1c43c972012-02-28 11:07:09 -0800887 if (MakeFreeSpaceOnCache(source_file->size) < 0) {
Doug Zongkerc4351c72010-02-22 14:46:32 -0800888 printf("not enough free space on /cache\n");
889 return 1;
890 }
891
892 if (SaveFileContents(CACHE_TEMP_SOURCE, source_file) < 0) {
893 printf("failed to back up source file\n");
894 return 1;
895 }
896 made_copy = 1;
897 unlink(source_filename);
898
899 size_t free_space = FreeSpaceForFile(target_fs);
Doug Zongkerbf80f492012-10-19 12:24:26 -0700900 printf("(now %ld bytes free for target) ", (long)free_space);
Doug Zongkerc4351c72010-02-22 14:46:32 -0800901 }
902 }
903
904 const Value* patch;
905 if (source_patch_value != NULL) {
Doug Zongker1c43c972012-02-28 11:07:09 -0800906 source_to_use = source_file;
Doug Zongkerc4351c72010-02-22 14:46:32 -0800907 patch = source_patch_value;
908 } else {
Doug Zongker1c43c972012-02-28 11:07:09 -0800909 source_to_use = copy_file;
Doug Zongkerc4351c72010-02-22 14:46:32 -0800910 patch = copy_patch_value;
911 }
912
913 if (patch->type != VAL_BLOB) {
914 printf("patch is not a blob\n");
915 return 1;
916 }
917
918 SinkFn sink = NULL;
919 void* token = NULL;
920 output = -1;
921 outname = NULL;
Doug Zongkerf291d852010-07-07 13:55:25 -0700922 if (strncmp(target_filename, "MTD:", 4) == 0 ||
923 strncmp(target_filename, "EMMC:", 5) == 0) {
Doug Zongkerc4351c72010-02-22 14:46:32 -0800924 // We store the decoded output in memory.
925 msi.buffer = malloc(target_size);
926 if (msi.buffer == NULL) {
927 printf("failed to alloc %ld bytes for output\n",
928 (long)target_size);
929 return 1;
930 }
931 msi.pos = 0;
932 msi.size = target_size;
933 sink = MemorySink;
934 token = &msi;
935 } else {
936 // We write the decoded output to "<tgt-file>.patch".
937 outname = (char*)malloc(strlen(target_filename) + 10);
938 strcpy(outname, target_filename);
939 strcat(outname, ".patch");
940
Nick Kralevich956cde82012-06-26 15:01:03 -0700941 output = open(outname, O_WRONLY | O_CREAT | O_TRUNC, S_IRUSR | S_IWUSR);
Doug Zongkerc4351c72010-02-22 14:46:32 -0800942 if (output < 0) {
943 printf("failed to open output file %s: %s\n",
944 outname, strerror(errno));
945 return 1;
946 }
947 sink = FileSink;
948 token = &output;
949 }
950
951 char* header = patch->data;
952 ssize_t header_bytes_read = patch->size;
953
954 SHA_init(&ctx);
955
956 int result;
957
958 if (header_bytes_read >= 8 &&
959 memcmp(header, "BSDIFF40", 8) == 0) {
960 result = ApplyBSDiffPatch(source_to_use->data, source_to_use->size,
961 patch, 0, sink, token, &ctx);
962 } else if (header_bytes_read >= 8 &&
963 memcmp(header, "IMGDIFF2", 8) == 0) {
964 result = ApplyImagePatch(source_to_use->data, source_to_use->size,
Doug Zongkera3ccba62012-08-20 15:28:02 -0700965 patch, sink, token, &ctx, bonus_data);
Doug Zongkerc4351c72010-02-22 14:46:32 -0800966 } else {
967 printf("Unknown patch file format\n");
968 return 1;
969 }
970
971 if (output >= 0) {
972 fsync(output);
973 close(output);
974 }
975
976 if (result != 0) {
977 if (retry == 0) {
978 printf("applying patch failed\n");
979 return result != 0;
980 } else {
981 printf("applying patch failed; retrying\n");
982 }
983 if (outname != NULL) {
984 unlink(outname);
985 }
986 } else {
987 // succeeded; no need to retry
988 break;
989 }
990 } while (retry-- > 0);
991
992 const uint8_t* current_target_sha1 = SHA_final(&ctx);
993 if (memcmp(current_target_sha1, target_sha1, SHA_DIGEST_SIZE) != 0) {
994 printf("patch did not produce expected sha1\n");
Doug Zongker512536a2010-02-17 16:11:44 -0800995 return 1;
Doug Zongkerbf80f492012-10-19 12:24:26 -0700996 } else {
997 printf("now ");
998 print_short_sha1(target_sha1);
999 putchar('\n');
Doug Zongkerc4351c72010-02-22 14:46:32 -08001000 }
1001
1002 if (output < 0) {
Doug Zongkerf291d852010-07-07 13:55:25 -07001003 // Copy the temp file to the partition.
1004 if (WriteToPartition(msi.buffer, msi.pos, target_filename) != 0) {
Doug Zongkerc4351c72010-02-22 14:46:32 -08001005 printf("write of patched data to %s failed\n", target_filename);
1006 return 1;
1007 }
1008 free(msi.buffer);
Doug Zongker512536a2010-02-17 16:11:44 -08001009 } else {
Doug Zongkerc4351c72010-02-22 14:46:32 -08001010 // Give the .patch file the same owner, group, and mode of the
1011 // original source file.
1012 if (chmod(outname, source_to_use->st.st_mode) != 0) {
1013 printf("chmod of \"%s\" failed: %s\n", outname, strerror(errno));
1014 return 1;
1015 }
1016 if (chown(outname, source_to_use->st.st_uid,
1017 source_to_use->st.st_gid) != 0) {
1018 printf("chown of \"%s\" failed: %s\n", outname, strerror(errno));
1019 return 1;
1020 }
Doug Zongker512536a2010-02-17 16:11:44 -08001021
Doug Zongkerc4351c72010-02-22 14:46:32 -08001022 // Finally, rename the .patch file to replace the target file.
1023 if (rename(outname, target_filename) != 0) {
1024 printf("rename of .patch to \"%s\" failed: %s\n",
1025 target_filename, strerror(errno));
1026 return 1;
1027 }
Doug Zongker512536a2010-02-17 16:11:44 -08001028 }
1029
Doug Zongkerc4351c72010-02-22 14:46:32 -08001030 // If this run of applypatch created the copy, and we're here, we
1031 // can delete it.
1032 if (made_copy) unlink(CACHE_TEMP_SOURCE);
Doug Zongker512536a2010-02-17 16:11:44 -08001033
Doug Zongkerc4351c72010-02-22 14:46:32 -08001034 // Success!
1035 return 0;
Doug Zongker512536a2010-02-17 16:11:44 -08001036}