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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>
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>
Doug Zongkera1bc1482014-02-13 15:18:19 -080027#include <stdbool.h>
Doug Zongker512536a2010-02-17 16:11:44 -080028
29#include "mincrypt/sha.h"
30#include "applypatch.h"
31#include "mtdutils/mtdutils.h"
Doug Zongkerc4351c72010-02-22 14:46:32 -080032#include "edify/expr.h"
Doug Zongker512536a2010-02-17 16:11:44 -080033
Doug Zongkerf291d852010-07-07 13:55:25 -070034static int LoadPartitionContents(const char* filename, FileContents* file);
Doug Zongkerbc7ffed2014-08-15 14:31:52 -070035static ssize_t FileSink(const unsigned char* data, ssize_t len, void* token);
Doug Zongker1c43c972012-02-28 11:07:09 -080036static int GenerateTarget(FileContents* source_file,
37 const Value* source_patch_value,
38 FileContents* copy_file,
39 const Value* copy_patch_value,
40 const char* source_filename,
41 const char* target_filename,
42 const uint8_t target_sha1[SHA_DIGEST_SIZE],
Doug Zongkera3ccba62012-08-20 15:28:02 -070043 size_t target_size,
44 const Value* bonus_data);
Doug Zongker512536a2010-02-17 16:11:44 -080045
46static int mtd_partitions_scanned = 0;
47
Doug Zongkera1bc1482014-02-13 15:18:19 -080048// Read a file into memory; store the file contents and associated
Hristo Bojinovdb314d62010-08-02 10:29:49 -070049// metadata in *file.
50//
51// Return 0 on success.
Doug Zongkera1bc1482014-02-13 15:18:19 -080052int LoadFileContents(const char* filename, FileContents* file) {
Doug Zongker512536a2010-02-17 16:11:44 -080053 file->data = NULL;
Doug Zongker512536a2010-02-17 16:11:44 -080054
Doug Zongkerf291d852010-07-07 13:55:25 -070055 // A special 'filename' beginning with "MTD:" or "EMMC:" means to
56 // load the contents of a partition.
57 if (strncmp(filename, "MTD:", 4) == 0 ||
58 strncmp(filename, "EMMC:", 5) == 0) {
59 return LoadPartitionContents(filename, file);
Doug Zongkerc4351c72010-02-22 14:46:32 -080060 }
Doug Zongker512536a2010-02-17 16:11:44 -080061
Doug Zongkerc4351c72010-02-22 14:46:32 -080062 if (stat(filename, &file->st) != 0) {
63 printf("failed to stat \"%s\": %s\n", filename, strerror(errno));
64 return -1;
65 }
66
67 file->size = file->st.st_size;
68 file->data = malloc(file->size);
69
70 FILE* f = fopen(filename, "rb");
71 if (f == NULL) {
72 printf("failed to open \"%s\": %s\n", filename, strerror(errno));
73 free(file->data);
74 file->data = NULL;
75 return -1;
76 }
77
78 ssize_t bytes_read = fread(file->data, 1, file->size, f);
79 if (bytes_read != file->size) {
80 printf("short read of \"%s\" (%ld bytes of %ld)\n",
81 filename, (long)bytes_read, (long)file->size);
82 free(file->data);
83 file->data = NULL;
84 return -1;
85 }
86 fclose(f);
87
Doug Zongkerbac7fba2013-04-10 11:32:17 -070088 SHA_hash(file->data, file->size, file->sha1);
Doug Zongkerc4351c72010-02-22 14:46:32 -080089 return 0;
Doug Zongker512536a2010-02-17 16:11:44 -080090}
91
92static size_t* size_array;
93// comparison function for qsort()ing an int array of indexes into
94// size_array[].
95static int compare_size_indices(const void* a, const void* b) {
Doug Zongkerc4351c72010-02-22 14:46:32 -080096 int aa = *(int*)a;
97 int bb = *(int*)b;
98 if (size_array[aa] < size_array[bb]) {
99 return -1;
100 } else if (size_array[aa] > size_array[bb]) {
101 return 1;
102 } else {
103 return 0;
104 }
Doug Zongker512536a2010-02-17 16:11:44 -0800105}
106
Doug Zongkerf291d852010-07-07 13:55:25 -0700107// Load the contents of an MTD or EMMC partition into the provided
Doug Zongker512536a2010-02-17 16:11:44 -0800108// FileContents. filename should be a string of the form
Doug Zongkerf291d852010-07-07 13:55:25 -0700109// "MTD:<partition_name>:<size_1>:<sha1_1>:<size_2>:<sha1_2>:..." (or
110// "EMMC:<partition_device>:..."). The smallest size_n bytes for
111// which that prefix of the partition contents has the corresponding
112// sha1 hash will be loaded. It is acceptable for a size value to be
113// repeated with different sha1s. Will return 0 on success.
Doug Zongker512536a2010-02-17 16:11:44 -0800114//
115// This complexity is needed because if an OTA installation is
116// interrupted, the partition might contain either the source or the
117// target data, which might be of different lengths. We need to know
Doug Zongkerf291d852010-07-07 13:55:25 -0700118// the length in order to read from a partition (there is no
119// "end-of-file" marker), so the caller must specify the possible
120// lengths and the hash of the data, and we'll do the load expecting
121// to find one of those hashes.
122enum PartitionType { MTD, EMMC };
123
124static int LoadPartitionContents(const char* filename, FileContents* file) {
Doug Zongkerc4351c72010-02-22 14:46:32 -0800125 char* copy = strdup(filename);
126 const char* magic = strtok(copy, ":");
Doug Zongkerf291d852010-07-07 13:55:25 -0700127
128 enum PartitionType type;
129
130 if (strcmp(magic, "MTD") == 0) {
131 type = MTD;
132 } else if (strcmp(magic, "EMMC") == 0) {
133 type = EMMC;
134 } else {
135 printf("LoadPartitionContents called with bad filename (%s)\n",
Doug Zongkerc4351c72010-02-22 14:46:32 -0800136 filename);
137 return -1;
Doug Zongker512536a2010-02-17 16:11:44 -0800138 }
Doug Zongkerc4351c72010-02-22 14:46:32 -0800139 const char* partition = strtok(NULL, ":");
Doug Zongker512536a2010-02-17 16:11:44 -0800140
Doug Zongkerc4351c72010-02-22 14:46:32 -0800141 int i;
142 int colons = 0;
143 for (i = 0; filename[i] != '\0'; ++i) {
144 if (filename[i] == ':') {
145 ++colons;
146 }
Doug Zongker512536a2010-02-17 16:11:44 -0800147 }
Doug Zongkerc4351c72010-02-22 14:46:32 -0800148 if (colons < 3 || colons%2 == 0) {
Doug Zongkerf291d852010-07-07 13:55:25 -0700149 printf("LoadPartitionContents called with bad filename (%s)\n",
Doug Zongkerc4351c72010-02-22 14:46:32 -0800150 filename);
151 }
Doug Zongker512536a2010-02-17 16:11:44 -0800152
Doug Zongkerc4351c72010-02-22 14:46:32 -0800153 int pairs = (colons-1)/2; // # of (size,sha1) pairs in filename
154 int* index = malloc(pairs * sizeof(int));
155 size_t* size = malloc(pairs * sizeof(size_t));
156 char** sha1sum = malloc(pairs * sizeof(char*));
Doug Zongker512536a2010-02-17 16:11:44 -0800157
Doug Zongkerc4351c72010-02-22 14:46:32 -0800158 for (i = 0; i < pairs; ++i) {
159 const char* size_str = strtok(NULL, ":");
160 size[i] = strtol(size_str, NULL, 10);
161 if (size[i] == 0) {
Doug Zongkerf291d852010-07-07 13:55:25 -0700162 printf("LoadPartitionContents called with bad size (%s)\n", filename);
Doug Zongkerc4351c72010-02-22 14:46:32 -0800163 return -1;
164 }
165 sha1sum[i] = strtok(NULL, ":");
166 index[i] = i;
167 }
Doug Zongker512536a2010-02-17 16:11:44 -0800168
Doug Zongkerc4351c72010-02-22 14:46:32 -0800169 // sort the index[] array so it indexes the pairs in order of
170 // increasing size.
171 size_array = size;
172 qsort(index, pairs, sizeof(int), compare_size_indices);
Doug Zongker512536a2010-02-17 16:11:44 -0800173
Doug Zongkerf291d852010-07-07 13:55:25 -0700174 MtdReadContext* ctx = NULL;
175 FILE* dev = NULL;
Doug Zongker512536a2010-02-17 16:11:44 -0800176
Doug Zongkerf291d852010-07-07 13:55:25 -0700177 switch (type) {
178 case MTD:
179 if (!mtd_partitions_scanned) {
180 mtd_scan_partitions();
181 mtd_partitions_scanned = 1;
182 }
Doug Zongker512536a2010-02-17 16:11:44 -0800183
Doug Zongkerf291d852010-07-07 13:55:25 -0700184 const MtdPartition* mtd = mtd_find_partition_by_name(partition);
185 if (mtd == NULL) {
186 printf("mtd partition \"%s\" not found (loading %s)\n",
187 partition, filename);
188 return -1;
189 }
190
191 ctx = mtd_read_partition(mtd);
192 if (ctx == NULL) {
193 printf("failed to initialize read of mtd partition \"%s\"\n",
194 partition);
195 return -1;
196 }
197 break;
198
199 case EMMC:
200 dev = fopen(partition, "rb");
201 if (dev == NULL) {
202 printf("failed to open emmc partition \"%s\": %s\n",
203 partition, strerror(errno));
204 return -1;
205 }
Doug Zongkerc4351c72010-02-22 14:46:32 -0800206 }
Doug Zongker512536a2010-02-17 16:11:44 -0800207
Doug Zongkerc4351c72010-02-22 14:46:32 -0800208 SHA_CTX sha_ctx;
209 SHA_init(&sha_ctx);
210 uint8_t parsed_sha[SHA_DIGEST_SIZE];
211
212 // allocate enough memory to hold the largest size.
213 file->data = malloc(size[index[pairs-1]]);
214 char* p = (char*)file->data;
215 file->size = 0; // # bytes read so far
216
217 for (i = 0; i < pairs; ++i) {
218 // Read enough additional bytes to get us up to the next size
219 // (again, we're trying the possibilities in order of increasing
220 // size).
221 size_t next = size[index[i]] - file->size;
222 size_t read = 0;
223 if (next > 0) {
Doug Zongkerf291d852010-07-07 13:55:25 -0700224 switch (type) {
225 case MTD:
226 read = mtd_read_data(ctx, p, next);
227 break;
228
229 case EMMC:
230 read = fread(p, 1, next, dev);
231 break;
232 }
Doug Zongkerc4351c72010-02-22 14:46:32 -0800233 if (next != read) {
Mark Salyzynf3bb31c2014-03-14 09:39:48 -0700234 printf("short read (%zu bytes of %zu) for partition \"%s\"\n",
Doug Zongkerc4351c72010-02-22 14:46:32 -0800235 read, next, partition);
236 free(file->data);
237 file->data = NULL;
238 return -1;
239 }
240 SHA_update(&sha_ctx, p, read);
241 file->size += read;
242 }
243
244 // Duplicate the SHA context and finalize the duplicate so we can
245 // check it against this pair's expected hash.
246 SHA_CTX temp_ctx;
247 memcpy(&temp_ctx, &sha_ctx, sizeof(SHA_CTX));
248 const uint8_t* sha_so_far = SHA_final(&temp_ctx);
249
250 if (ParseSha1(sha1sum[index[i]], parsed_sha) != 0) {
251 printf("failed to parse sha1 %s in %s\n",
252 sha1sum[index[i]], filename);
253 free(file->data);
254 file->data = NULL;
255 return -1;
256 }
257
258 if (memcmp(sha_so_far, parsed_sha, SHA_DIGEST_SIZE) == 0) {
259 // we have a match. stop reading the partition; we'll return
260 // the data we've read so far.
Mark Salyzynf3bb31c2014-03-14 09:39:48 -0700261 printf("partition read matched size %zu sha %s\n",
Doug Zongkerc4351c72010-02-22 14:46:32 -0800262 size[index[i]], sha1sum[index[i]]);
263 break;
264 }
265
266 p += read;
267 }
268
Doug Zongkerf291d852010-07-07 13:55:25 -0700269 switch (type) {
270 case MTD:
271 mtd_read_close(ctx);
272 break;
273
274 case EMMC:
275 fclose(dev);
276 break;
277 }
278
Doug Zongkerc4351c72010-02-22 14:46:32 -0800279
280 if (i == pairs) {
281 // Ran off the end of the list of (size,sha1) pairs without
282 // finding a match.
Doug Zongkerf291d852010-07-07 13:55:25 -0700283 printf("contents of partition \"%s\" didn't match %s\n",
Doug Zongkerc4351c72010-02-22 14:46:32 -0800284 partition, filename);
Doug Zongker512536a2010-02-17 16:11:44 -0800285 free(file->data);
286 file->data = NULL;
287 return -1;
Doug Zongker512536a2010-02-17 16:11:44 -0800288 }
289
Doug Zongkerc4351c72010-02-22 14:46:32 -0800290 const uint8_t* sha_final = SHA_final(&sha_ctx);
291 for (i = 0; i < SHA_DIGEST_SIZE; ++i) {
292 file->sha1[i] = sha_final[i];
Doug Zongker512536a2010-02-17 16:11:44 -0800293 }
294
Doug Zongkerc4351c72010-02-22 14:46:32 -0800295 // Fake some stat() info.
296 file->st.st_mode = 0644;
297 file->st.st_uid = 0;
298 file->st.st_gid = 0;
Doug Zongker512536a2010-02-17 16:11:44 -0800299
Doug Zongkerc4351c72010-02-22 14:46:32 -0800300 free(copy);
301 free(index);
302 free(size);
303 free(sha1sum);
Doug Zongker512536a2010-02-17 16:11:44 -0800304
Doug Zongkerc4351c72010-02-22 14:46:32 -0800305 return 0;
Doug Zongker512536a2010-02-17 16:11:44 -0800306}
307
308
309// Save the contents of the given FileContents object under the given
310// filename. Return 0 on success.
Doug Zongker1c43c972012-02-28 11:07:09 -0800311int SaveFileContents(const char* filename, const FileContents* file) {
Nick Kralevich956cde82012-06-26 15:01:03 -0700312 int fd = open(filename, O_WRONLY | O_CREAT | O_TRUNC, S_IRUSR | S_IWUSR);
Doug Zongkerc4351c72010-02-22 14:46:32 -0800313 if (fd < 0) {
314 printf("failed to open \"%s\" for write: %s\n",
315 filename, strerror(errno));
316 return -1;
317 }
Doug Zongker512536a2010-02-17 16:11:44 -0800318
Doug Zongker1c43c972012-02-28 11:07:09 -0800319 ssize_t bytes_written = FileSink(file->data, file->size, &fd);
320 if (bytes_written != file->size) {
Doug Zongkerc4351c72010-02-22 14:46:32 -0800321 printf("short write of \"%s\" (%ld bytes of %ld) (%s)\n",
Doug Zongker1c43c972012-02-28 11:07:09 -0800322 filename, (long)bytes_written, (long)file->size,
Doug Zongkerc4351c72010-02-22 14:46:32 -0800323 strerror(errno));
324 close(fd);
325 return -1;
326 }
327 fsync(fd);
Doug Zongker512536a2010-02-17 16:11:44 -0800328 close(fd);
Doug Zongker512536a2010-02-17 16:11:44 -0800329
Doug Zongker1c43c972012-02-28 11:07:09 -0800330 if (chmod(filename, file->st.st_mode) != 0) {
Doug Zongkerc4351c72010-02-22 14:46:32 -0800331 printf("chmod of \"%s\" failed: %s\n", filename, strerror(errno));
332 return -1;
333 }
Doug Zongker1c43c972012-02-28 11:07:09 -0800334 if (chown(filename, file->st.st_uid, file->st.st_gid) != 0) {
Doug Zongkerc4351c72010-02-22 14:46:32 -0800335 printf("chown of \"%s\" failed: %s\n", filename, strerror(errno));
336 return -1;
337 }
Doug Zongker512536a2010-02-17 16:11:44 -0800338
Doug Zongkerc4351c72010-02-22 14:46:32 -0800339 return 0;
Doug Zongker512536a2010-02-17 16:11:44 -0800340}
341
Doug Zongkerf291d852010-07-07 13:55:25 -0700342// Write a memory buffer to 'target' partition, a string of the form
343// "MTD:<partition>[:...]" or "EMMC:<partition_device>:". Return 0 on
344// success.
345int WriteToPartition(unsigned char* data, size_t len,
346 const char* target) {
347 char* copy = strdup(target);
348 const char* magic = strtok(copy, ":");
349
350 enum PartitionType type;
351 if (strcmp(magic, "MTD") == 0) {
352 type = MTD;
353 } else if (strcmp(magic, "EMMC") == 0) {
354 type = EMMC;
355 } else {
356 printf("WriteToPartition called with bad target (%s)\n", target);
357 return -1;
358 }
359 const char* partition = strtok(NULL, ":");
360
Doug Zongkerc4351c72010-02-22 14:46:32 -0800361 if (partition == NULL) {
Doug Zongkerf291d852010-07-07 13:55:25 -0700362 printf("bad partition target name \"%s\"\n", target);
Doug Zongkerc4351c72010-02-22 14:46:32 -0800363 return -1;
364 }
Doug Zongker512536a2010-02-17 16:11:44 -0800365
Doug Zongkerf291d852010-07-07 13:55:25 -0700366 switch (type) {
367 case MTD:
368 if (!mtd_partitions_scanned) {
369 mtd_scan_partitions();
370 mtd_partitions_scanned = 1;
371 }
372
373 const MtdPartition* mtd = mtd_find_partition_by_name(partition);
374 if (mtd == NULL) {
375 printf("mtd partition \"%s\" not found for writing\n",
376 partition);
377 return -1;
378 }
379
380 MtdWriteContext* ctx = mtd_write_partition(mtd);
381 if (ctx == NULL) {
382 printf("failed to init mtd partition \"%s\" for writing\n",
383 partition);
384 return -1;
385 }
386
387 size_t written = mtd_write_data(ctx, (char*)data, len);
388 if (written != len) {
Mark Salyzynf3bb31c2014-03-14 09:39:48 -0700389 printf("only wrote %zu of %zu bytes to MTD %s\n",
Doug Zongkerf291d852010-07-07 13:55:25 -0700390 written, len, partition);
391 mtd_write_close(ctx);
392 return -1;
393 }
394
395 if (mtd_erase_blocks(ctx, -1) < 0) {
396 printf("error finishing mtd write of %s\n", partition);
397 mtd_write_close(ctx);
398 return -1;
399 }
400
401 if (mtd_write_close(ctx)) {
402 printf("error closing mtd write of %s\n", partition);
403 return -1;
404 }
405 break;
406
407 case EMMC:
Doug Zongker044a0b42013-07-08 09:42:54 -0700408 {
409 size_t start = 0;
410 int success = 0;
Doug Zongker168724c2013-12-19 15:16:57 -0800411 int fd = open(partition, O_RDWR);
Doug Zongkerc870a992013-07-09 10:34:46 -0700412 if (fd < 0) {
Doug Zongker044a0b42013-07-08 09:42:54 -0700413 printf("failed to open %s: %s\n", partition, strerror(errno));
Doug Zongkerf291d852010-07-07 13:55:25 -0700414 return -1;
415 }
Doug Zongker044a0b42013-07-08 09:42:54 -0700416 int attempt;
417
Doug Zongker168724c2013-12-19 15:16:57 -0800418 for (attempt = 0; attempt < 2; ++attempt) {
Doug Zongkerc870a992013-07-09 10:34:46 -0700419 lseek(fd, start, SEEK_SET);
Doug Zongker044a0b42013-07-08 09:42:54 -0700420 while (start < len) {
421 size_t to_write = len - start;
Doug Zongker168724c2013-12-19 15:16:57 -0800422 if (to_write > 1<<20) to_write = 1<<20;
Doug Zongker044a0b42013-07-08 09:42:54 -0700423
Doug Zongkerc870a992013-07-09 10:34:46 -0700424 ssize_t written = write(fd, data+start, to_write);
425 if (written < 0) {
426 if (errno == EINTR) {
427 written = 0;
428 } else {
429 printf("failed write writing to %s (%s)\n",
430 partition, strerror(errno));
431 return -1;
432 }
Doug Zongker044a0b42013-07-08 09:42:54 -0700433 }
Doug Zongkerc870a992013-07-09 10:34:46 -0700434 start += written;
Doug Zongker044a0b42013-07-08 09:42:54 -0700435 }
Doug Zongkerc870a992013-07-09 10:34:46 -0700436 fsync(fd);
Doug Zongker044a0b42013-07-08 09:42:54 -0700437
438 // drop caches so our subsequent verification read
439 // won't just be reading the cache.
440 sync();
Doug Zongkerc870a992013-07-09 10:34:46 -0700441 int dc = open("/proc/sys/vm/drop_caches", O_WRONLY);
442 write(dc, "3\n", 2);
443 close(dc);
Doug Zongker044a0b42013-07-08 09:42:54 -0700444 sleep(1);
445 printf(" caches dropped\n");
446
447 // verify
Doug Zongkerc870a992013-07-09 10:34:46 -0700448 lseek(fd, 0, SEEK_SET);
Doug Zongker044a0b42013-07-08 09:42:54 -0700449 unsigned char buffer[4096];
450 start = len;
451 size_t p;
452 for (p = 0; p < len; p += sizeof(buffer)) {
453 size_t to_read = len - p;
454 if (to_read > sizeof(buffer)) to_read = sizeof(buffer);
455
Doug Zongkerc870a992013-07-09 10:34:46 -0700456 size_t so_far = 0;
457 while (so_far < to_read) {
458 ssize_t read_count = read(fd, buffer+so_far, to_read-so_far);
459 if (read_count < 0) {
460 if (errno == EINTR) {
461 read_count = 0;
462 } else {
Mark Salyzynf3bb31c2014-03-14 09:39:48 -0700463 printf("verify read error %s at %zu: %s\n",
Doug Zongkerc870a992013-07-09 10:34:46 -0700464 partition, p, strerror(errno));
465 return -1;
466 }
467 }
Doug Zongkerbf4a69a2013-07-10 13:39:50 -0700468 if ((size_t)read_count < to_read) {
Mark Salyzynf3bb31c2014-03-14 09:39:48 -0700469 printf("short verify read %s at %zu: %zd %zu %s\n",
Doug Zongkerc870a992013-07-09 10:34:46 -0700470 partition, p, read_count, to_read, strerror(errno));
471 }
472 so_far += read_count;
Doug Zongker044a0b42013-07-08 09:42:54 -0700473 }
474
475 if (memcmp(buffer, data+p, to_read)) {
Mark Salyzynf3bb31c2014-03-14 09:39:48 -0700476 printf("verification failed starting at %zu\n", p);
Doug Zongker044a0b42013-07-08 09:42:54 -0700477 start = p;
478 break;
479 }
480 }
481
482 if (start == len) {
483 printf("verification read succeeded (attempt %d)\n", attempt+1);
484 success = true;
485 break;
486 }
487 }
488
489 if (!success) {
490 printf("failed to verify after all attempts\n");
491 return -1;
492 }
493
Doug Zongkerc870a992013-07-09 10:34:46 -0700494 if (close(fd) != 0) {
Doug Zongkerf291d852010-07-07 13:55:25 -0700495 printf("error closing %s (%s)\n", partition, strerror(errno));
496 return -1;
497 }
Doug Zongkerbf4a69a2013-07-10 13:39:50 -0700498 sync();
Doug Zongkerf291d852010-07-07 13:55:25 -0700499 break;
Doug Zongker044a0b42013-07-08 09:42:54 -0700500 }
Doug Zongkerc4351c72010-02-22 14:46:32 -0800501 }
Doug Zongker512536a2010-02-17 16:11:44 -0800502
Doug Zongkerf291d852010-07-07 13:55:25 -0700503 free(copy);
Doug Zongkerc4351c72010-02-22 14:46:32 -0800504 return 0;
Doug Zongker512536a2010-02-17 16:11:44 -0800505}
506
507
508// Take a string 'str' of 40 hex digits and parse it into the 20
509// byte array 'digest'. 'str' may contain only the digest or be of
510// the form "<digest>:<anything>". Return 0 on success, -1 on any
511// error.
512int ParseSha1(const char* str, uint8_t* digest) {
Doug Zongkerc4351c72010-02-22 14:46:32 -0800513 int i;
514 const char* ps = str;
515 uint8_t* pd = digest;
516 for (i = 0; i < SHA_DIGEST_SIZE * 2; ++i, ++ps) {
517 int digit;
518 if (*ps >= '0' && *ps <= '9') {
519 digit = *ps - '0';
520 } else if (*ps >= 'a' && *ps <= 'f') {
521 digit = *ps - 'a' + 10;
522 } else if (*ps >= 'A' && *ps <= 'F') {
523 digit = *ps - 'A' + 10;
524 } else {
525 return -1;
526 }
527 if (i % 2 == 0) {
528 *pd = digit << 4;
529 } else {
530 *pd |= digit;
531 ++pd;
532 }
Doug Zongker512536a2010-02-17 16:11:44 -0800533 }
Doug Zongkerc4351c72010-02-22 14:46:32 -0800534 if (*ps != '\0') return -1;
535 return 0;
Doug Zongker512536a2010-02-17 16:11:44 -0800536}
537
Doug Zongkerc4351c72010-02-22 14:46:32 -0800538// Search an array of sha1 strings for one matching the given sha1.
539// Return the index of the match on success, or -1 if no match is
540// found.
Doug Zongker044a0b42013-07-08 09:42:54 -0700541int FindMatchingPatch(uint8_t* sha1, char* const * const patch_sha1_str,
Doug Zongkerc4351c72010-02-22 14:46:32 -0800542 int num_patches) {
543 int i;
544 uint8_t patch_sha1[SHA_DIGEST_SIZE];
545 for (i = 0; i < num_patches; ++i) {
546 if (ParseSha1(patch_sha1_str[i], patch_sha1) == 0 &&
547 memcmp(patch_sha1, sha1, SHA_DIGEST_SIZE) == 0) {
548 return i;
549 }
Doug Zongker512536a2010-02-17 16:11:44 -0800550 }
Doug Zongkerc4351c72010-02-22 14:46:32 -0800551 return -1;
Doug Zongker512536a2010-02-17 16:11:44 -0800552}
553
554// Returns 0 if the contents of the file (argv[2]) or the cached file
555// match any of the sha1's on the command line (argv[3:]). Returns
556// nonzero otherwise.
Doug Zongkerc4351c72010-02-22 14:46:32 -0800557int applypatch_check(const char* filename,
558 int num_patches, char** const patch_sha1_str) {
559 FileContents file;
560 file.data = NULL;
Doug Zongker512536a2010-02-17 16:11:44 -0800561
Doug Zongkerc4351c72010-02-22 14:46:32 -0800562 // It's okay to specify no sha1s; the check will pass if the
Doug Zongkerf291d852010-07-07 13:55:25 -0700563 // LoadFileContents is successful. (Useful for reading
Doug Zongkerc4351c72010-02-22 14:46:32 -0800564 // partitions, where the filename encodes the sha1s; no need to
565 // check them twice.)
Doug Zongkera1bc1482014-02-13 15:18:19 -0800566 if (LoadFileContents(filename, &file) != 0 ||
Doug Zongkerc4351c72010-02-22 14:46:32 -0800567 (num_patches > 0 &&
568 FindMatchingPatch(file.sha1, patch_sha1_str, num_patches) < 0)) {
569 printf("file \"%s\" doesn't have any of expected "
570 "sha1 sums; checking cache\n", filename);
Doug Zongker512536a2010-02-17 16:11:44 -0800571
Doug Zongkerc4351c72010-02-22 14:46:32 -0800572 free(file.data);
Doug Zongker1c43c972012-02-28 11:07:09 -0800573 file.data = NULL;
Doug Zongker512536a2010-02-17 16:11:44 -0800574
Doug Zongkerc4351c72010-02-22 14:46:32 -0800575 // If the source file is missing or corrupted, it might be because
576 // we were killed in the middle of patching it. A copy of it
577 // should have been made in CACHE_TEMP_SOURCE. If that file
578 // exists and matches the sha1 we're looking for, the check still
579 // passes.
580
Doug Zongkera1bc1482014-02-13 15:18:19 -0800581 if (LoadFileContents(CACHE_TEMP_SOURCE, &file) != 0) {
Doug Zongkerc4351c72010-02-22 14:46:32 -0800582 printf("failed to load cache file\n");
583 return 1;
584 }
585
586 if (FindMatchingPatch(file.sha1, patch_sha1_str, num_patches) < 0) {
587 printf("cache bits don't match any sha1 for \"%s\"\n", filename);
588 free(file.data);
589 return 1;
590 }
591 }
Doug Zongker512536a2010-02-17 16:11:44 -0800592
593 free(file.data);
Doug Zongkerc4351c72010-02-22 14:46:32 -0800594 return 0;
Doug Zongker512536a2010-02-17 16:11:44 -0800595}
596
597int ShowLicenses() {
Doug Zongkerc4351c72010-02-22 14:46:32 -0800598 ShowBSDiffLicense();
599 return 0;
Doug Zongker512536a2010-02-17 16:11:44 -0800600}
601
Doug Zongkerbc7ffed2014-08-15 14:31:52 -0700602ssize_t FileSink(const unsigned char* data, ssize_t len, void* token) {
Doug Zongkerc4351c72010-02-22 14:46:32 -0800603 int fd = *(int *)token;
604 ssize_t done = 0;
605 ssize_t wrote;
606 while (done < (ssize_t) len) {
607 wrote = write(fd, data+done, len-done);
608 if (wrote <= 0) {
609 printf("error writing %d bytes: %s\n", (int)(len-done), strerror(errno));
610 return done;
611 }
612 done += wrote;
Doug Zongker512536a2010-02-17 16:11:44 -0800613 }
Doug Zongkerc4351c72010-02-22 14:46:32 -0800614 return done;
Doug Zongker512536a2010-02-17 16:11:44 -0800615}
616
617typedef struct {
Doug Zongkerc4351c72010-02-22 14:46:32 -0800618 unsigned char* buffer;
619 ssize_t size;
620 ssize_t pos;
Doug Zongker512536a2010-02-17 16:11:44 -0800621} MemorySinkInfo;
622
Doug Zongkerbc7ffed2014-08-15 14:31:52 -0700623ssize_t MemorySink(const unsigned char* data, ssize_t len, void* token) {
Doug Zongkerc4351c72010-02-22 14:46:32 -0800624 MemorySinkInfo* msi = (MemorySinkInfo*)token;
625 if (msi->size - msi->pos < len) {
626 return -1;
627 }
628 memcpy(msi->buffer + msi->pos, data, len);
629 msi->pos += len;
630 return len;
Doug Zongker512536a2010-02-17 16:11:44 -0800631}
632
633// Return the amount of free space (in bytes) on the filesystem
634// containing filename. filename must exist. Return -1 on error.
635size_t FreeSpaceForFile(const char* filename) {
Doug Zongkerc4351c72010-02-22 14:46:32 -0800636 struct statfs sf;
637 if (statfs(filename, &sf) != 0) {
638 printf("failed to statfs %s: %s\n", filename, strerror(errno));
639 return -1;
640 }
641 return sf.f_bsize * sf.f_bfree;
Doug Zongker512536a2010-02-17 16:11:44 -0800642}
643
Doug Zongkerc4351c72010-02-22 14:46:32 -0800644int CacheSizeCheck(size_t bytes) {
645 if (MakeFreeSpaceOnCache(bytes) < 0) {
646 printf("unable to make %ld bytes available on /cache\n", (long)bytes);
647 return 1;
648 } else {
649 return 0;
650 }
651}
652
Doug Zongkerbf80f492012-10-19 12:24:26 -0700653static void print_short_sha1(const uint8_t sha1[SHA_DIGEST_SIZE]) {
654 int i;
655 const char* hex = "0123456789abcdef";
656 for (i = 0; i < 4; ++i) {
657 putchar(hex[(sha1[i]>>4) & 0xf]);
658 putchar(hex[sha1[i] & 0xf]);
659 }
660}
Doug Zongkerc4351c72010-02-22 14:46:32 -0800661
662// This function applies binary patches to files in a way that is safe
Doug Zongker512536a2010-02-17 16:11:44 -0800663// (the original file is not touched until we have the desired
664// replacement for it) and idempotent (it's okay to run this program
665// multiple times).
666//
Doug Zongkerc4351c72010-02-22 14:46:32 -0800667// - if the sha1 hash of <target_filename> is <target_sha1_string>,
668// does nothing and exits successfully.
Doug Zongker512536a2010-02-17 16:11:44 -0800669//
Doug Zongkerc4351c72010-02-22 14:46:32 -0800670// - otherwise, if the sha1 hash of <source_filename> is one of the
671// entries in <patch_sha1_str>, the corresponding patch from
672// <patch_data> (which must be a VAL_BLOB) is applied to produce a
673// new file (the type of patch is automatically detected from the
674// blob daat). If that new file has sha1 hash <target_sha1_str>,
675// moves it to replace <target_filename>, and exits successfully.
676// Note that if <source_filename> and <target_filename> are not the
677// same, <source_filename> is NOT deleted on success.
678// <target_filename> may be the string "-" to mean "the same as
679// source_filename".
Doug Zongker512536a2010-02-17 16:11:44 -0800680//
681// - otherwise, or if any error is encountered, exits with non-zero
682// status.
683//
Doug Zongkerf291d852010-07-07 13:55:25 -0700684// <source_filename> may refer to a partition to read the source data.
685// See the comments for the LoadPartition Contents() function above
Doug Zongkerc4351c72010-02-22 14:46:32 -0800686// for the format of such a filename.
Doug Zongker512536a2010-02-17 16:11:44 -0800687
Doug Zongkerc4351c72010-02-22 14:46:32 -0800688int applypatch(const char* source_filename,
689 const char* target_filename,
690 const char* target_sha1_str,
691 size_t target_size,
692 int num_patches,
693 char** const patch_sha1_str,
Doug Zongkera3ccba62012-08-20 15:28:02 -0700694 Value** patch_data,
695 Value* bonus_data) {
Doug Zongkerbf80f492012-10-19 12:24:26 -0700696 printf("patch %s: ", source_filename);
Doug Zongker512536a2010-02-17 16:11:44 -0800697
Doug Zongkerc4351c72010-02-22 14:46:32 -0800698 if (target_filename[0] == '-' &&
699 target_filename[1] == '\0') {
700 target_filename = source_filename;
Doug Zongker512536a2010-02-17 16:11:44 -0800701 }
702
Doug Zongkerc4351c72010-02-22 14:46:32 -0800703 uint8_t target_sha1[SHA_DIGEST_SIZE];
704 if (ParseSha1(target_sha1_str, target_sha1) != 0) {
705 printf("failed to parse tgt-sha1 \"%s\"\n", target_sha1_str);
Doug Zongker512536a2010-02-17 16:11:44 -0800706 return 1;
Doug Zongkerc4351c72010-02-22 14:46:32 -0800707 }
Doug Zongker512536a2010-02-17 16:11:44 -0800708
Doug Zongkerc4351c72010-02-22 14:46:32 -0800709 FileContents copy_file;
710 FileContents source_file;
Doug Zongker1c43c972012-02-28 11:07:09 -0800711 copy_file.data = NULL;
712 source_file.data = NULL;
Doug Zongkerc4351c72010-02-22 14:46:32 -0800713 const Value* source_patch_value = NULL;
714 const Value* copy_patch_value = NULL;
Doug Zongker512536a2010-02-17 16:11:44 -0800715
Doug Zongkerc4351c72010-02-22 14:46:32 -0800716 // We try to load the target file into the source_file object.
Doug Zongkera1bc1482014-02-13 15:18:19 -0800717 if (LoadFileContents(target_filename, &source_file) == 0) {
Doug Zongkerc4351c72010-02-22 14:46:32 -0800718 if (memcmp(source_file.sha1, target_sha1, SHA_DIGEST_SIZE) == 0) {
719 // The early-exit case: the patch was already applied, this file
720 // has the desired hash, nothing for us to do.
Doug Zongkerbf80f492012-10-19 12:24:26 -0700721 printf("already ");
722 print_short_sha1(target_sha1);
723 putchar('\n');
Doug Zongker1c43c972012-02-28 11:07:09 -0800724 free(source_file.data);
Doug Zongkerc4351c72010-02-22 14:46:32 -0800725 return 0;
726 }
727 }
Doug Zongker512536a2010-02-17 16:11:44 -0800728
Doug Zongkerc4351c72010-02-22 14:46:32 -0800729 if (source_file.data == NULL ||
730 (target_filename != source_filename &&
731 strcmp(target_filename, source_filename) != 0)) {
732 // Need to load the source file: either we failed to load the
733 // target file, or we did but it's different from the source file.
734 free(source_file.data);
Doug Zongker1c43c972012-02-28 11:07:09 -0800735 source_file.data = NULL;
Doug Zongkera1bc1482014-02-13 15:18:19 -0800736 LoadFileContents(source_filename, &source_file);
Doug Zongkerc4351c72010-02-22 14:46:32 -0800737 }
738
739 if (source_file.data != NULL) {
740 int to_use = FindMatchingPatch(source_file.sha1,
741 patch_sha1_str, num_patches);
742 if (to_use >= 0) {
743 source_patch_value = patch_data[to_use];
744 }
745 }
746
747 if (source_patch_value == NULL) {
748 free(source_file.data);
Doug Zongker1c43c972012-02-28 11:07:09 -0800749 source_file.data = NULL;
Doug Zongkerc4351c72010-02-22 14:46:32 -0800750 printf("source file is bad; trying copy\n");
751
Doug Zongkera1bc1482014-02-13 15:18:19 -0800752 if (LoadFileContents(CACHE_TEMP_SOURCE, &copy_file) < 0) {
Doug Zongkerc4351c72010-02-22 14:46:32 -0800753 // fail.
754 printf("failed to read copy file\n");
755 return 1;
Doug Zongker512536a2010-02-17 16:11:44 -0800756 }
757
Doug Zongkerc4351c72010-02-22 14:46:32 -0800758 int to_use = FindMatchingPatch(copy_file.sha1,
759 patch_sha1_str, num_patches);
Doug Zongker8cd9e4f2010-08-12 17:38:09 -0700760 if (to_use >= 0) {
Doug Zongkerc4351c72010-02-22 14:46:32 -0800761 copy_patch_value = patch_data[to_use];
Doug Zongker512536a2010-02-17 16:11:44 -0800762 }
763
Doug Zongkerc4351c72010-02-22 14:46:32 -0800764 if (copy_patch_value == NULL) {
765 // fail.
766 printf("copy file doesn't match source SHA-1s either\n");
Doug Zongker1c43c972012-02-28 11:07:09 -0800767 free(copy_file.data);
Doug Zongkerc4351c72010-02-22 14:46:32 -0800768 return 1;
Doug Zongker512536a2010-02-17 16:11:44 -0800769 }
Doug Zongker512536a2010-02-17 16:11:44 -0800770 }
771
Doug Zongker1c43c972012-02-28 11:07:09 -0800772 int result = GenerateTarget(&source_file, source_patch_value,
773 &copy_file, copy_patch_value,
774 source_filename, target_filename,
Doug Zongkera3ccba62012-08-20 15:28:02 -0700775 target_sha1, target_size, bonus_data);
Doug Zongker1c43c972012-02-28 11:07:09 -0800776 free(source_file.data);
777 free(copy_file.data);
778
779 return result;
780}
781
782static int GenerateTarget(FileContents* source_file,
783 const Value* source_patch_value,
784 FileContents* copy_file,
785 const Value* copy_patch_value,
786 const char* source_filename,
787 const char* target_filename,
788 const uint8_t target_sha1[SHA_DIGEST_SIZE],
Doug Zongkera3ccba62012-08-20 15:28:02 -0700789 size_t target_size,
790 const Value* bonus_data) {
Doug Zongkerc4351c72010-02-22 14:46:32 -0800791 int retry = 1;
792 SHA_CTX ctx;
793 int output;
794 MemorySinkInfo msi;
795 FileContents* source_to_use;
796 char* outname;
Doug Zongker1c43c972012-02-28 11:07:09 -0800797 int made_copy = 0;
Doug Zongkerc4351c72010-02-22 14:46:32 -0800798
799 // assume that target_filename (eg "/system/app/Foo.apk") is located
800 // on the same filesystem as its top-level directory ("/system").
801 // We need something that exists for calling statfs().
802 char target_fs[strlen(target_filename)+1];
803 char* slash = strchr(target_filename+1, '/');
804 if (slash != NULL) {
805 int count = slash - target_filename;
806 strncpy(target_fs, target_filename, count);
807 target_fs[count] = '\0';
Doug Zongker512536a2010-02-17 16:11:44 -0800808 } else {
Doug Zongkerc4351c72010-02-22 14:46:32 -0800809 strcpy(target_fs, target_filename);
Doug Zongker512536a2010-02-17 16:11:44 -0800810 }
811
Doug Zongkerc4351c72010-02-22 14:46:32 -0800812 do {
813 // Is there enough room in the target filesystem to hold the patched
814 // file?
815
Doug Zongkerf291d852010-07-07 13:55:25 -0700816 if (strncmp(target_filename, "MTD:", 4) == 0 ||
817 strncmp(target_filename, "EMMC:", 5) == 0) {
818 // If the target is a partition, we're actually going to
819 // write the output to /tmp and then copy it to the
820 // partition. statfs() always returns 0 blocks free for
821 // /tmp, so instead we'll just assume that /tmp has enough
822 // space to hold the file.
Doug Zongkerc4351c72010-02-22 14:46:32 -0800823
Doug Zongkerf291d852010-07-07 13:55:25 -0700824 // We still write the original source to cache, in case
825 // the partition write is interrupted.
Doug Zongker1c43c972012-02-28 11:07:09 -0800826 if (MakeFreeSpaceOnCache(source_file->size) < 0) {
Doug Zongkerc4351c72010-02-22 14:46:32 -0800827 printf("not enough free space on /cache\n");
828 return 1;
829 }
830 if (SaveFileContents(CACHE_TEMP_SOURCE, source_file) < 0) {
831 printf("failed to back up source file\n");
832 return 1;
833 }
834 made_copy = 1;
835 retry = 0;
836 } else {
837 int enough_space = 0;
838 if (retry > 0) {
839 size_t free_space = FreeSpaceForFile(target_fs);
Doug Zongker201cd462010-08-13 09:41:21 -0700840 enough_space =
841 (free_space > (256 << 10)) && // 256k (two-block) minimum
Doug Zongkerc4351c72010-02-22 14:46:32 -0800842 (free_space > (target_size * 3 / 2)); // 50% margin of error
Doug Zongkerbf80f492012-10-19 12:24:26 -0700843 if (!enough_space) {
844 printf("target %ld bytes; free space %ld bytes; retry %d; enough %d\n",
845 (long)target_size, (long)free_space, retry, enough_space);
846 }
Doug Zongkerc4351c72010-02-22 14:46:32 -0800847 }
848
849 if (!enough_space) {
850 retry = 0;
851 }
852
853 if (!enough_space && source_patch_value != NULL) {
854 // Using the original source, but not enough free space. First
855 // copy the source file to cache, then delete it from the original
856 // location.
857
Doug Zongkerf291d852010-07-07 13:55:25 -0700858 if (strncmp(source_filename, "MTD:", 4) == 0 ||
859 strncmp(source_filename, "EMMC:", 5) == 0) {
Doug Zongkerc4351c72010-02-22 14:46:32 -0800860 // It's impossible to free space on the target filesystem by
Doug Zongkerf291d852010-07-07 13:55:25 -0700861 // deleting the source if the source is a partition. If
Doug Zongkerc4351c72010-02-22 14:46:32 -0800862 // we're ever in a state where we need to do this, fail.
Doug Zongkerf291d852010-07-07 13:55:25 -0700863 printf("not enough free space for target but source "
864 "is partition\n");
Doug Zongkerc4351c72010-02-22 14:46:32 -0800865 return 1;
866 }
867
Doug Zongker1c43c972012-02-28 11:07:09 -0800868 if (MakeFreeSpaceOnCache(source_file->size) < 0) {
Doug Zongkerc4351c72010-02-22 14:46:32 -0800869 printf("not enough free space on /cache\n");
870 return 1;
871 }
872
873 if (SaveFileContents(CACHE_TEMP_SOURCE, source_file) < 0) {
874 printf("failed to back up source file\n");
875 return 1;
876 }
877 made_copy = 1;
878 unlink(source_filename);
879
880 size_t free_space = FreeSpaceForFile(target_fs);
Doug Zongkerbf80f492012-10-19 12:24:26 -0700881 printf("(now %ld bytes free for target) ", (long)free_space);
Doug Zongkerc4351c72010-02-22 14:46:32 -0800882 }
883 }
884
885 const Value* patch;
886 if (source_patch_value != NULL) {
Doug Zongker1c43c972012-02-28 11:07:09 -0800887 source_to_use = source_file;
Doug Zongkerc4351c72010-02-22 14:46:32 -0800888 patch = source_patch_value;
889 } else {
Doug Zongker1c43c972012-02-28 11:07:09 -0800890 source_to_use = copy_file;
Doug Zongkerc4351c72010-02-22 14:46:32 -0800891 patch = copy_patch_value;
892 }
893
894 if (patch->type != VAL_BLOB) {
895 printf("patch is not a blob\n");
896 return 1;
897 }
898
899 SinkFn sink = NULL;
900 void* token = NULL;
901 output = -1;
902 outname = NULL;
Doug Zongkerf291d852010-07-07 13:55:25 -0700903 if (strncmp(target_filename, "MTD:", 4) == 0 ||
904 strncmp(target_filename, "EMMC:", 5) == 0) {
Doug Zongkerc4351c72010-02-22 14:46:32 -0800905 // We store the decoded output in memory.
906 msi.buffer = malloc(target_size);
907 if (msi.buffer == NULL) {
908 printf("failed to alloc %ld bytes for output\n",
909 (long)target_size);
910 return 1;
911 }
912 msi.pos = 0;
913 msi.size = target_size;
914 sink = MemorySink;
915 token = &msi;
916 } else {
917 // We write the decoded output to "<tgt-file>.patch".
918 outname = (char*)malloc(strlen(target_filename) + 10);
919 strcpy(outname, target_filename);
920 strcat(outname, ".patch");
921
Nick Kralevich956cde82012-06-26 15:01:03 -0700922 output = open(outname, O_WRONLY | O_CREAT | O_TRUNC, S_IRUSR | S_IWUSR);
Doug Zongkerc4351c72010-02-22 14:46:32 -0800923 if (output < 0) {
924 printf("failed to open output file %s: %s\n",
925 outname, strerror(errno));
926 return 1;
927 }
928 sink = FileSink;
929 token = &output;
930 }
931
932 char* header = patch->data;
933 ssize_t header_bytes_read = patch->size;
934
935 SHA_init(&ctx);
936
937 int result;
938
939 if (header_bytes_read >= 8 &&
940 memcmp(header, "BSDIFF40", 8) == 0) {
941 result = ApplyBSDiffPatch(source_to_use->data, source_to_use->size,
942 patch, 0, sink, token, &ctx);
943 } else if (header_bytes_read >= 8 &&
944 memcmp(header, "IMGDIFF2", 8) == 0) {
945 result = ApplyImagePatch(source_to_use->data, source_to_use->size,
Doug Zongkera3ccba62012-08-20 15:28:02 -0700946 patch, sink, token, &ctx, bonus_data);
Doug Zongkerc4351c72010-02-22 14:46:32 -0800947 } else {
948 printf("Unknown patch file format\n");
949 return 1;
950 }
951
952 if (output >= 0) {
953 fsync(output);
954 close(output);
955 }
956
957 if (result != 0) {
958 if (retry == 0) {
959 printf("applying patch failed\n");
960 return result != 0;
961 } else {
962 printf("applying patch failed; retrying\n");
963 }
964 if (outname != NULL) {
965 unlink(outname);
966 }
967 } else {
968 // succeeded; no need to retry
969 break;
970 }
971 } while (retry-- > 0);
972
973 const uint8_t* current_target_sha1 = SHA_final(&ctx);
974 if (memcmp(current_target_sha1, target_sha1, SHA_DIGEST_SIZE) != 0) {
975 printf("patch did not produce expected sha1\n");
Doug Zongker512536a2010-02-17 16:11:44 -0800976 return 1;
Doug Zongkerbf80f492012-10-19 12:24:26 -0700977 } else {
978 printf("now ");
979 print_short_sha1(target_sha1);
980 putchar('\n');
Doug Zongkerc4351c72010-02-22 14:46:32 -0800981 }
982
983 if (output < 0) {
Doug Zongkerf291d852010-07-07 13:55:25 -0700984 // Copy the temp file to the partition.
985 if (WriteToPartition(msi.buffer, msi.pos, target_filename) != 0) {
Doug Zongkerc4351c72010-02-22 14:46:32 -0800986 printf("write of patched data to %s failed\n", target_filename);
987 return 1;
988 }
989 free(msi.buffer);
Doug Zongker512536a2010-02-17 16:11:44 -0800990 } else {
Doug Zongkerc4351c72010-02-22 14:46:32 -0800991 // Give the .patch file the same owner, group, and mode of the
992 // original source file.
993 if (chmod(outname, source_to_use->st.st_mode) != 0) {
994 printf("chmod of \"%s\" failed: %s\n", outname, strerror(errno));
995 return 1;
996 }
997 if (chown(outname, source_to_use->st.st_uid,
998 source_to_use->st.st_gid) != 0) {
999 printf("chown of \"%s\" failed: %s\n", outname, strerror(errno));
1000 return 1;
1001 }
Doug Zongker512536a2010-02-17 16:11:44 -08001002
Doug Zongkerc4351c72010-02-22 14:46:32 -08001003 // Finally, rename the .patch file to replace the target file.
1004 if (rename(outname, target_filename) != 0) {
1005 printf("rename of .patch to \"%s\" failed: %s\n",
1006 target_filename, strerror(errno));
1007 return 1;
1008 }
Doug Zongker512536a2010-02-17 16:11:44 -08001009 }
1010
Doug Zongkerc4351c72010-02-22 14:46:32 -08001011 // If this run of applypatch created the copy, and we're here, we
1012 // can delete it.
1013 if (made_copy) unlink(CACHE_TEMP_SOURCE);
Doug Zongker512536a2010-02-17 16:11:44 -08001014
Doug Zongkerc4351c72010-02-22 14:46:32 -08001015 // Success!
1016 return 0;
Doug Zongker512536a2010-02-17 16:11:44 -08001017}