blob: 026863330a5734caee294418bbfe7757f19f224a [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>
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
Tao Baoaca8e892015-07-17 11:47:44 -070028#include <base/strings.h>
29
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"
Doug Zongker512536a2010-02-17 16:11:44 -080034
Doug Zongkerf291d852010-07-07 13:55:25 -070035static int LoadPartitionContents(const char* filename, FileContents* file);
Doug Zongkerbc7ffed2014-08-15 14:31:52 -070036static ssize_t FileSink(const unsigned char* data, ssize_t len, void* token);
Doug Zongker1c43c972012-02-28 11:07:09 -080037static int GenerateTarget(FileContents* source_file,
38 const Value* source_patch_value,
39 FileContents* copy_file,
40 const Value* copy_patch_value,
41 const char* source_filename,
42 const char* target_filename,
43 const uint8_t target_sha1[SHA_DIGEST_SIZE],
Doug Zongkera3ccba62012-08-20 15:28:02 -070044 size_t target_size,
45 const Value* bonus_data);
Doug Zongker512536a2010-02-17 16:11:44 -080046
Tao Baoaca8e892015-07-17 11:47:44 -070047static bool mtd_partitions_scanned = false;
Doug Zongker512536a2010-02-17 16:11:44 -080048
Doug Zongkera1bc1482014-02-13 15:18:19 -080049// Read a file into memory; store the file contents and associated
Hristo Bojinovdb314d62010-08-02 10:29:49 -070050// metadata in *file.
51//
52// Return 0 on success.
Doug Zongkera1bc1482014-02-13 15:18:19 -080053int LoadFileContents(const char* filename, FileContents* file) {
Doug Zongker512536a2010-02-17 16:11:44 -080054 file->data = NULL;
Doug Zongker512536a2010-02-17 16:11:44 -080055
Doug Zongkerf291d852010-07-07 13:55:25 -070056 // A special 'filename' beginning with "MTD:" or "EMMC:" means to
57 // load the contents of a partition.
58 if (strncmp(filename, "MTD:", 4) == 0 ||
59 strncmp(filename, "EMMC:", 5) == 0) {
60 return LoadPartitionContents(filename, file);
Doug Zongkerc4351c72010-02-22 14:46:32 -080061 }
Doug Zongker512536a2010-02-17 16:11:44 -080062
Doug Zongkerc4351c72010-02-22 14:46:32 -080063 if (stat(filename, &file->st) != 0) {
64 printf("failed to stat \"%s\": %s\n", filename, strerror(errno));
65 return -1;
66 }
67
68 file->size = file->st.st_size;
Tao Baoba9a42a2015-06-23 23:23:33 -070069 file->data = reinterpret_cast<unsigned char*>(malloc(file->size));
Doug Zongkerc4351c72010-02-22 14:46:32 -080070
71 FILE* f = fopen(filename, "rb");
72 if (f == NULL) {
73 printf("failed to open \"%s\": %s\n", filename, strerror(errno));
74 free(file->data);
75 file->data = NULL;
76 return -1;
77 }
78
Tao Baoba9a42a2015-06-23 23:23:33 -070079 size_t bytes_read = fread(file->data, 1, file->size, f);
80 if (bytes_read != static_cast<size_t>(file->size)) {
81 printf("short read of \"%s\" (%zu bytes of %zd)\n", filename, bytes_read, file->size);
Doug Zongkerc4351c72010-02-22 14:46:32 -080082 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
Doug Zongkerf291d852010-07-07 13:55:25 -070092// Load the contents of an MTD or EMMC partition into the provided
Doug Zongker512536a2010-02-17 16:11:44 -080093// FileContents. filename should be a string of the form
Doug Zongkerf291d852010-07-07 13:55:25 -070094// "MTD:<partition_name>:<size_1>:<sha1_1>:<size_2>:<sha1_2>:..." (or
95// "EMMC:<partition_device>:..."). The smallest size_n bytes for
96// which that prefix of the partition contents has the corresponding
97// sha1 hash will be loaded. It is acceptable for a size value to be
98// repeated with different sha1s. Will return 0 on success.
Doug Zongker512536a2010-02-17 16:11:44 -080099//
100// This complexity is needed because if an OTA installation is
101// interrupted, the partition might contain either the source or the
102// target data, which might be of different lengths. We need to know
Doug Zongkerf291d852010-07-07 13:55:25 -0700103// the length in order to read from a partition (there is no
104// "end-of-file" marker), so the caller must specify the possible
105// lengths and the hash of the data, and we'll do the load expecting
106// to find one of those hashes.
107enum PartitionType { MTD, EMMC };
108
109static int LoadPartitionContents(const char* filename, FileContents* file) {
Tao Baoaca8e892015-07-17 11:47:44 -0700110 std::string copy(filename);
111 std::vector<std::string> pieces = android::base::Split(copy, ":");
112 if (pieces.size() < 4 || pieces.size() % 2 != 0) {
113 printf("LoadPartitionContents called with bad filename (%s)\n", filename);
114 return -1;
115 }
Doug Zongkerf291d852010-07-07 13:55:25 -0700116
117 enum PartitionType type;
Tao Baoaca8e892015-07-17 11:47:44 -0700118 if (pieces[0] == "MTD") {
Doug Zongkerf291d852010-07-07 13:55:25 -0700119 type = MTD;
Tao Baoaca8e892015-07-17 11:47:44 -0700120 } else if (pieces[0] == "EMMC") {
Doug Zongkerf291d852010-07-07 13:55:25 -0700121 type = EMMC;
122 } else {
Tao Baoba9a42a2015-06-23 23:23:33 -0700123 printf("LoadPartitionContents called with bad filename (%s)\n", filename);
Doug Zongkerc4351c72010-02-22 14:46:32 -0800124 return -1;
Doug Zongker512536a2010-02-17 16:11:44 -0800125 }
Tao Baoaca8e892015-07-17 11:47:44 -0700126 const char* partition = pieces[1].c_str();
Doug Zongker512536a2010-02-17 16:11:44 -0800127
Tao Baoaca8e892015-07-17 11:47:44 -0700128 size_t pairs = (pieces.size() - 2) / 2; // # of (size, sha1) pairs in filename
129 std::vector<size_t> index(pairs);
130 std::vector<size_t> size(pairs);
131 std::vector<std::string> sha1sum(pairs);
Doug Zongker512536a2010-02-17 16:11:44 -0800132
Tao Baoaca8e892015-07-17 11:47:44 -0700133 for (size_t i = 0; i < pairs; ++i) {
134 size[i] = strtol(pieces[i*2+2].c_str(), NULL, 10);
Doug Zongkerc4351c72010-02-22 14:46:32 -0800135 if (size[i] == 0) {
Doug Zongkerf291d852010-07-07 13:55:25 -0700136 printf("LoadPartitionContents called with bad size (%s)\n", filename);
Doug Zongkerc4351c72010-02-22 14:46:32 -0800137 return -1;
138 }
Tao Baoaca8e892015-07-17 11:47:44 -0700139 sha1sum[i] = pieces[i*2+3].c_str();
Doug Zongkerc4351c72010-02-22 14:46:32 -0800140 index[i] = i;
141 }
Doug Zongker512536a2010-02-17 16:11:44 -0800142
Tao Baoaca8e892015-07-17 11:47:44 -0700143 // Sort the index[] array so it indexes the pairs in order of increasing size.
144 sort(index.begin(), index.end(),
145 [&](const size_t& i, const size_t& j) {
146 return (size[i] < size[j]);
147 }
148 );
Doug Zongker512536a2010-02-17 16:11:44 -0800149
Doug Zongkerf291d852010-07-07 13:55:25 -0700150 MtdReadContext* ctx = NULL;
151 FILE* dev = NULL;
Doug Zongker512536a2010-02-17 16:11:44 -0800152
Doug Zongkerf291d852010-07-07 13:55:25 -0700153 switch (type) {
Tao Baoba9a42a2015-06-23 23:23:33 -0700154 case MTD: {
Doug Zongkerf291d852010-07-07 13:55:25 -0700155 if (!mtd_partitions_scanned) {
156 mtd_scan_partitions();
Tao Baoaca8e892015-07-17 11:47:44 -0700157 mtd_partitions_scanned = true;
Doug Zongkerf291d852010-07-07 13:55:25 -0700158 }
Doug Zongker512536a2010-02-17 16:11:44 -0800159
Doug Zongkerf291d852010-07-07 13:55:25 -0700160 const MtdPartition* mtd = mtd_find_partition_by_name(partition);
161 if (mtd == NULL) {
Tao Baoaca8e892015-07-17 11:47:44 -0700162 printf("mtd partition \"%s\" not found (loading %s)\n", partition, filename);
Doug Zongkerf291d852010-07-07 13:55:25 -0700163 return -1;
164 }
165
166 ctx = mtd_read_partition(mtd);
167 if (ctx == NULL) {
Tao Baoaca8e892015-07-17 11:47:44 -0700168 printf("failed to initialize read of mtd partition \"%s\"\n", partition);
Doug Zongkerf291d852010-07-07 13:55:25 -0700169 return -1;
170 }
171 break;
Tao Baoba9a42a2015-06-23 23:23:33 -0700172 }
Doug Zongkerf291d852010-07-07 13:55:25 -0700173
174 case EMMC:
175 dev = fopen(partition, "rb");
176 if (dev == NULL) {
Tao Baoaca8e892015-07-17 11:47:44 -0700177 printf("failed to open emmc partition \"%s\": %s\n", partition, strerror(errno));
Doug Zongkerf291d852010-07-07 13:55:25 -0700178 return -1;
179 }
Doug Zongkerc4351c72010-02-22 14:46:32 -0800180 }
Doug Zongker512536a2010-02-17 16:11:44 -0800181
Doug Zongkerc4351c72010-02-22 14:46:32 -0800182 SHA_CTX sha_ctx;
183 SHA_init(&sha_ctx);
184 uint8_t parsed_sha[SHA_DIGEST_SIZE];
185
Tao Baoaca8e892015-07-17 11:47:44 -0700186 // Allocate enough memory to hold the largest size.
Tao Baoba9a42a2015-06-23 23:23:33 -0700187 file->data = reinterpret_cast<unsigned char*>(malloc(size[index[pairs-1]]));
Doug Zongkerc4351c72010-02-22 14:46:32 -0800188 char* p = (char*)file->data;
189 file->size = 0; // # bytes read so far
Tao Baoaca8e892015-07-17 11:47:44 -0700190 bool found = false;
Doug Zongkerc4351c72010-02-22 14:46:32 -0800191
Tao Baoaca8e892015-07-17 11:47:44 -0700192 for (size_t i = 0; i < pairs; ++i) {
193 // Read enough additional bytes to get us up to the next size. (Again,
194 // we're trying the possibilities in order of increasing size).
Doug Zongkerc4351c72010-02-22 14:46:32 -0800195 size_t next = size[index[i]] - file->size;
196 size_t read = 0;
197 if (next > 0) {
Doug Zongkerf291d852010-07-07 13:55:25 -0700198 switch (type) {
199 case MTD:
200 read = mtd_read_data(ctx, p, next);
201 break;
202
203 case EMMC:
204 read = fread(p, 1, next, dev);
205 break;
206 }
Doug Zongkerc4351c72010-02-22 14:46:32 -0800207 if (next != read) {
Mark Salyzynf3bb31c2014-03-14 09:39:48 -0700208 printf("short read (%zu bytes of %zu) for partition \"%s\"\n",
Doug Zongkerc4351c72010-02-22 14:46:32 -0800209 read, next, partition);
210 free(file->data);
211 file->data = NULL;
212 return -1;
213 }
214 SHA_update(&sha_ctx, p, read);
215 file->size += read;
216 }
217
218 // Duplicate the SHA context and finalize the duplicate so we can
219 // check it against this pair's expected hash.
220 SHA_CTX temp_ctx;
221 memcpy(&temp_ctx, &sha_ctx, sizeof(SHA_CTX));
222 const uint8_t* sha_so_far = SHA_final(&temp_ctx);
223
Tao Baoaca8e892015-07-17 11:47:44 -0700224 if (ParseSha1(sha1sum[index[i]].c_str(), parsed_sha) != 0) {
225 printf("failed to parse sha1 %s in %s\n", sha1sum[index[i]].c_str(), filename);
Doug Zongkerc4351c72010-02-22 14:46:32 -0800226 free(file->data);
227 file->data = NULL;
228 return -1;
229 }
230
231 if (memcmp(sha_so_far, parsed_sha, SHA_DIGEST_SIZE) == 0) {
232 // we have a match. stop reading the partition; we'll return
233 // the data we've read so far.
Mark Salyzynf3bb31c2014-03-14 09:39:48 -0700234 printf("partition read matched size %zu sha %s\n",
Tao Baoaca8e892015-07-17 11:47:44 -0700235 size[index[i]], sha1sum[index[i]].c_str());
236 found = true;
Doug Zongkerc4351c72010-02-22 14:46:32 -0800237 break;
238 }
239
240 p += read;
241 }
242
Doug Zongkerf291d852010-07-07 13:55:25 -0700243 switch (type) {
244 case MTD:
245 mtd_read_close(ctx);
246 break;
247
248 case EMMC:
249 fclose(dev);
250 break;
251 }
252
Doug Zongkerc4351c72010-02-22 14:46:32 -0800253
Tao Baoaca8e892015-07-17 11:47:44 -0700254 if (!found) {
255 // Ran off the end of the list of (size,sha1) pairs without finding a match.
Tao Baoba9a42a2015-06-23 23:23:33 -0700256 printf("contents of partition \"%s\" didn't match %s\n", partition, filename);
Doug Zongker512536a2010-02-17 16:11:44 -0800257 free(file->data);
258 file->data = NULL;
259 return -1;
Doug Zongker512536a2010-02-17 16:11:44 -0800260 }
261
Doug Zongkerc4351c72010-02-22 14:46:32 -0800262 const uint8_t* sha_final = SHA_final(&sha_ctx);
Tao Baoba9a42a2015-06-23 23:23:33 -0700263 for (size_t i = 0; i < SHA_DIGEST_SIZE; ++i) {
Doug Zongkerc4351c72010-02-22 14:46:32 -0800264 file->sha1[i] = sha_final[i];
Doug Zongker512536a2010-02-17 16:11:44 -0800265 }
266
Doug Zongkerc4351c72010-02-22 14:46:32 -0800267 // Fake some stat() info.
268 file->st.st_mode = 0644;
269 file->st.st_uid = 0;
270 file->st.st_gid = 0;
Doug Zongker512536a2010-02-17 16:11:44 -0800271
Doug Zongkerc4351c72010-02-22 14:46:32 -0800272 return 0;
Doug Zongker512536a2010-02-17 16:11:44 -0800273}
274
275
276// Save the contents of the given FileContents object under the given
277// filename. Return 0 on success.
Doug Zongker1c43c972012-02-28 11:07:09 -0800278int SaveFileContents(const char* filename, const FileContents* file) {
Michael Rungebe81e512014-10-29 12:42:15 -0700279 int fd = open(filename, O_WRONLY | O_CREAT | O_TRUNC | O_SYNC, S_IRUSR | S_IWUSR);
Doug Zongkerc4351c72010-02-22 14:46:32 -0800280 if (fd < 0) {
Tao Baoba9a42a2015-06-23 23:23:33 -0700281 printf("failed to open \"%s\" for write: %s\n", filename, strerror(errno));
Doug Zongkerc4351c72010-02-22 14:46:32 -0800282 return -1;
283 }
Doug Zongker512536a2010-02-17 16:11:44 -0800284
Doug Zongker1c43c972012-02-28 11:07:09 -0800285 ssize_t bytes_written = FileSink(file->data, file->size, &fd);
286 if (bytes_written != file->size) {
Tao Baoba9a42a2015-06-23 23:23:33 -0700287 printf("short write of \"%s\" (%zd bytes of %zd) (%s)\n",
288 filename, bytes_written, file->size, strerror(errno));
Doug Zongkerc4351c72010-02-22 14:46:32 -0800289 close(fd);
290 return -1;
291 }
Michael Rungebe81e512014-10-29 12:42:15 -0700292 if (fsync(fd) != 0) {
293 printf("fsync of \"%s\" failed: %s\n", filename, strerror(errno));
294 return -1;
295 }
296 if (close(fd) != 0) {
297 printf("close of \"%s\" failed: %s\n", filename, strerror(errno));
298 return -1;
299 }
Doug Zongker512536a2010-02-17 16:11:44 -0800300
Doug Zongker1c43c972012-02-28 11:07:09 -0800301 if (chmod(filename, file->st.st_mode) != 0) {
Doug Zongkerc4351c72010-02-22 14:46:32 -0800302 printf("chmod of \"%s\" failed: %s\n", filename, strerror(errno));
303 return -1;
304 }
Doug Zongker1c43c972012-02-28 11:07:09 -0800305 if (chown(filename, file->st.st_uid, file->st.st_gid) != 0) {
Doug Zongkerc4351c72010-02-22 14:46:32 -0800306 printf("chown of \"%s\" failed: %s\n", filename, strerror(errno));
307 return -1;
308 }
Doug Zongker512536a2010-02-17 16:11:44 -0800309
Doug Zongkerc4351c72010-02-22 14:46:32 -0800310 return 0;
Doug Zongker512536a2010-02-17 16:11:44 -0800311}
312
Doug Zongkerf291d852010-07-07 13:55:25 -0700313// Write a memory buffer to 'target' partition, a string of the form
Tao Baoaca8e892015-07-17 11:47:44 -0700314// "MTD:<partition>[:...]" or "EMMC:<partition_device>". Return 0 on
Doug Zongkerf291d852010-07-07 13:55:25 -0700315// success.
Tao Baoba9a42a2015-06-23 23:23:33 -0700316int WriteToPartition(unsigned char* data, size_t len, const char* target) {
Tao Baoaca8e892015-07-17 11:47:44 -0700317 std::string copy(target);
318 std::vector<std::string> pieces = android::base::Split(copy, ":");
319
320 if (pieces.size() != 2) {
321 printf("WriteToPartition called with bad target (%s)\n", target);
322 return -1;
323 }
Doug Zongkerf291d852010-07-07 13:55:25 -0700324
325 enum PartitionType type;
Tao Baoaca8e892015-07-17 11:47:44 -0700326 if (pieces[0] == "MTD") {
Doug Zongkerf291d852010-07-07 13:55:25 -0700327 type = MTD;
Tao Baoaca8e892015-07-17 11:47:44 -0700328 } else if (pieces[0] == "EMMC") {
Doug Zongkerf291d852010-07-07 13:55:25 -0700329 type = EMMC;
330 } else {
331 printf("WriteToPartition called with bad target (%s)\n", target);
332 return -1;
333 }
Tao Baoaca8e892015-07-17 11:47:44 -0700334 const char* partition = pieces[1].c_str();
Doug Zongker512536a2010-02-17 16:11:44 -0800335
Doug Zongkerf291d852010-07-07 13:55:25 -0700336 switch (type) {
Tao Baoba9a42a2015-06-23 23:23:33 -0700337 case MTD: {
Doug Zongkerf291d852010-07-07 13:55:25 -0700338 if (!mtd_partitions_scanned) {
339 mtd_scan_partitions();
Tao Baoaca8e892015-07-17 11:47:44 -0700340 mtd_partitions_scanned = true;
Doug Zongkerf291d852010-07-07 13:55:25 -0700341 }
342
343 const MtdPartition* mtd = mtd_find_partition_by_name(partition);
344 if (mtd == NULL) {
Tao Baoba9a42a2015-06-23 23:23:33 -0700345 printf("mtd partition \"%s\" not found for writing\n", partition);
Doug Zongkerf291d852010-07-07 13:55:25 -0700346 return -1;
347 }
348
349 MtdWriteContext* ctx = mtd_write_partition(mtd);
350 if (ctx == NULL) {
Tao Baoba9a42a2015-06-23 23:23:33 -0700351 printf("failed to init mtd partition \"%s\" for writing\n", partition);
Doug Zongkerf291d852010-07-07 13:55:25 -0700352 return -1;
353 }
354
Tao Baoba9a42a2015-06-23 23:23:33 -0700355 size_t written = mtd_write_data(ctx, reinterpret_cast<char*>(data), len);
Doug Zongkerf291d852010-07-07 13:55:25 -0700356 if (written != len) {
Tao Baoba9a42a2015-06-23 23:23:33 -0700357 printf("only wrote %zu of %zu bytes to MTD %s\n", written, len, partition);
Doug Zongkerf291d852010-07-07 13:55:25 -0700358 mtd_write_close(ctx);
359 return -1;
360 }
361
362 if (mtd_erase_blocks(ctx, -1) < 0) {
363 printf("error finishing mtd write of %s\n", partition);
364 mtd_write_close(ctx);
365 return -1;
366 }
367
368 if (mtd_write_close(ctx)) {
369 printf("error closing mtd write of %s\n", partition);
370 return -1;
371 }
372 break;
Tao Baoba9a42a2015-06-23 23:23:33 -0700373 }
Doug Zongkerf291d852010-07-07 13:55:25 -0700374
Tao Baoba9a42a2015-06-23 23:23:33 -0700375 case EMMC: {
Doug Zongker044a0b42013-07-08 09:42:54 -0700376 size_t start = 0;
Tao Baoba9a42a2015-06-23 23:23:33 -0700377 bool success = false;
Michael Rungebe81e512014-10-29 12:42:15 -0700378 int fd = open(partition, O_RDWR | O_SYNC);
Doug Zongkerc870a992013-07-09 10:34:46 -0700379 if (fd < 0) {
Doug Zongker044a0b42013-07-08 09:42:54 -0700380 printf("failed to open %s: %s\n", partition, strerror(errno));
Doug Zongkerf291d852010-07-07 13:55:25 -0700381 return -1;
382 }
Doug Zongker044a0b42013-07-08 09:42:54 -0700383
Tao Baoaca8e892015-07-17 11:47:44 -0700384 for (size_t attempt = 0; attempt < 2; ++attempt) {
Elliott Hughes7bad7c42015-04-28 17:24:24 -0700385 if (TEMP_FAILURE_RETRY(lseek(fd, start, SEEK_SET)) == -1) {
Tao Baoba9a42a2015-06-23 23:23:33 -0700386 printf("failed seek on %s: %s\n", partition, strerror(errno));
Elliott Hughes7bad7c42015-04-28 17:24:24 -0700387 return -1;
388 }
Doug Zongker044a0b42013-07-08 09:42:54 -0700389 while (start < len) {
390 size_t to_write = len - start;
Doug Zongker168724c2013-12-19 15:16:57 -0800391 if (to_write > 1<<20) to_write = 1<<20;
Doug Zongker044a0b42013-07-08 09:42:54 -0700392
Elliott Hughes7bad7c42015-04-28 17:24:24 -0700393 ssize_t written = TEMP_FAILURE_RETRY(write(fd, data+start, to_write));
394 if (written == -1) {
395 printf("failed write writing to %s: %s\n", partition, strerror(errno));
396 return -1;
Doug Zongker044a0b42013-07-08 09:42:54 -0700397 }
Doug Zongkerc870a992013-07-09 10:34:46 -0700398 start += written;
Doug Zongker044a0b42013-07-08 09:42:54 -0700399 }
Michael Rungebe81e512014-10-29 12:42:15 -0700400 if (fsync(fd) != 0) {
Tao Baoba9a42a2015-06-23 23:23:33 -0700401 printf("failed to sync to %s (%s)\n", partition, strerror(errno));
Michael Rungebe81e512014-10-29 12:42:15 -0700402 return -1;
403 }
404 if (close(fd) != 0) {
Tao Baoba9a42a2015-06-23 23:23:33 -0700405 printf("failed to close %s (%s)\n", partition, strerror(errno));
Michael Rungebe81e512014-10-29 12:42:15 -0700406 return -1;
407 }
408 fd = open(partition, O_RDONLY);
409 if (fd < 0) {
Tao Baoba9a42a2015-06-23 23:23:33 -0700410 printf("failed to reopen %s for verify (%s)\n", partition, strerror(errno));
Michael Rungebe81e512014-10-29 12:42:15 -0700411 return -1;
412 }
Doug Zongker044a0b42013-07-08 09:42:54 -0700413
Tao Baoba9a42a2015-06-23 23:23:33 -0700414 // Drop caches so our subsequent verification read
Doug Zongker044a0b42013-07-08 09:42:54 -0700415 // won't just be reading the cache.
416 sync();
Doug Zongkerc870a992013-07-09 10:34:46 -0700417 int dc = open("/proc/sys/vm/drop_caches", O_WRONLY);
Elliott Hughes7bad7c42015-04-28 17:24:24 -0700418 if (TEMP_FAILURE_RETRY(write(dc, "3\n", 2)) == -1) {
419 printf("write to /proc/sys/vm/drop_caches failed: %s\n", strerror(errno));
420 } else {
421 printf(" caches dropped\n");
422 }
Doug Zongkerc870a992013-07-09 10:34:46 -0700423 close(dc);
Doug Zongker044a0b42013-07-08 09:42:54 -0700424 sleep(1);
Doug Zongker044a0b42013-07-08 09:42:54 -0700425
426 // verify
Elliott Hughes7bad7c42015-04-28 17:24:24 -0700427 if (TEMP_FAILURE_RETRY(lseek(fd, 0, SEEK_SET)) == -1) {
428 printf("failed to seek back to beginning of %s: %s\n",
429 partition, strerror(errno));
430 return -1;
431 }
Doug Zongker044a0b42013-07-08 09:42:54 -0700432 unsigned char buffer[4096];
433 start = len;
Tao Baoba9a42a2015-06-23 23:23:33 -0700434 for (size_t p = 0; p < len; p += sizeof(buffer)) {
Doug Zongker044a0b42013-07-08 09:42:54 -0700435 size_t to_read = len - p;
Tao Baoba9a42a2015-06-23 23:23:33 -0700436 if (to_read > sizeof(buffer)) {
437 to_read = sizeof(buffer);
438 }
Doug Zongker044a0b42013-07-08 09:42:54 -0700439
Doug Zongkerc870a992013-07-09 10:34:46 -0700440 size_t so_far = 0;
441 while (so_far < to_read) {
Elliott Hughes7bad7c42015-04-28 17:24:24 -0700442 ssize_t read_count =
443 TEMP_FAILURE_RETRY(read(fd, buffer+so_far, to_read-so_far));
444 if (read_count == -1) {
445 printf("verify read error %s at %zu: %s\n",
446 partition, p, strerror(errno));
447 return -1;
Doug Zongkerc870a992013-07-09 10:34:46 -0700448 }
Tao Baoba9a42a2015-06-23 23:23:33 -0700449 if (static_cast<size_t>(read_count) < to_read) {
Mark Salyzynf3bb31c2014-03-14 09:39:48 -0700450 printf("short verify read %s at %zu: %zd %zu %s\n",
Doug Zongkerc870a992013-07-09 10:34:46 -0700451 partition, p, read_count, to_read, strerror(errno));
452 }
453 so_far += read_count;
Doug Zongker044a0b42013-07-08 09:42:54 -0700454 }
455
Tao Baoba9a42a2015-06-23 23:23:33 -0700456 if (memcmp(buffer, data+p, to_read) != 0) {
Mark Salyzynf3bb31c2014-03-14 09:39:48 -0700457 printf("verification failed starting at %zu\n", p);
Doug Zongker044a0b42013-07-08 09:42:54 -0700458 start = p;
459 break;
460 }
461 }
462
463 if (start == len) {
464 printf("verification read succeeded (attempt %d)\n", attempt+1);
465 success = true;
466 break;
467 }
468 }
469
470 if (!success) {
471 printf("failed to verify after all attempts\n");
472 return -1;
473 }
474
Doug Zongkerc870a992013-07-09 10:34:46 -0700475 if (close(fd) != 0) {
Doug Zongkerf291d852010-07-07 13:55:25 -0700476 printf("error closing %s (%s)\n", partition, strerror(errno));
477 return -1;
478 }
Doug Zongkerbf4a69a2013-07-10 13:39:50 -0700479 sync();
Doug Zongkerf291d852010-07-07 13:55:25 -0700480 break;
Doug Zongker044a0b42013-07-08 09:42:54 -0700481 }
Doug Zongkerc4351c72010-02-22 14:46:32 -0800482 }
Doug Zongker512536a2010-02-17 16:11:44 -0800483
Doug Zongkerc4351c72010-02-22 14:46:32 -0800484 return 0;
Doug Zongker512536a2010-02-17 16:11:44 -0800485}
486
487
488// Take a string 'str' of 40 hex digits and parse it into the 20
489// byte array 'digest'. 'str' may contain only the digest or be of
490// the form "<digest>:<anything>". Return 0 on success, -1 on any
491// error.
492int ParseSha1(const char* str, uint8_t* digest) {
Doug Zongkerc4351c72010-02-22 14:46:32 -0800493 const char* ps = str;
494 uint8_t* pd = digest;
Tao Baoba9a42a2015-06-23 23:23:33 -0700495 for (int i = 0; i < SHA_DIGEST_SIZE * 2; ++i, ++ps) {
Doug Zongkerc4351c72010-02-22 14:46:32 -0800496 int digit;
497 if (*ps >= '0' && *ps <= '9') {
498 digit = *ps - '0';
499 } else if (*ps >= 'a' && *ps <= 'f') {
500 digit = *ps - 'a' + 10;
501 } else if (*ps >= 'A' && *ps <= 'F') {
502 digit = *ps - 'A' + 10;
503 } else {
504 return -1;
505 }
506 if (i % 2 == 0) {
507 *pd = digit << 4;
508 } else {
509 *pd |= digit;
510 ++pd;
511 }
Doug Zongker512536a2010-02-17 16:11:44 -0800512 }
Doug Zongkerc4351c72010-02-22 14:46:32 -0800513 if (*ps != '\0') return -1;
514 return 0;
Doug Zongker512536a2010-02-17 16:11:44 -0800515}
516
Doug Zongkerc4351c72010-02-22 14:46:32 -0800517// Search an array of sha1 strings for one matching the given sha1.
518// Return the index of the match on success, or -1 if no match is
519// found.
Doug Zongker044a0b42013-07-08 09:42:54 -0700520int FindMatchingPatch(uint8_t* sha1, char* const * const patch_sha1_str,
Doug Zongkerc4351c72010-02-22 14:46:32 -0800521 int num_patches) {
Doug Zongkerc4351c72010-02-22 14:46:32 -0800522 uint8_t patch_sha1[SHA_DIGEST_SIZE];
Tao Baoba9a42a2015-06-23 23:23:33 -0700523 for (int i = 0; i < num_patches; ++i) {
Doug Zongkerc4351c72010-02-22 14:46:32 -0800524 if (ParseSha1(patch_sha1_str[i], patch_sha1) == 0 &&
525 memcmp(patch_sha1, sha1, SHA_DIGEST_SIZE) == 0) {
526 return i;
527 }
Doug Zongker512536a2010-02-17 16:11:44 -0800528 }
Doug Zongkerc4351c72010-02-22 14:46:32 -0800529 return -1;
Doug Zongker512536a2010-02-17 16:11:44 -0800530}
531
532// Returns 0 if the contents of the file (argv[2]) or the cached file
533// match any of the sha1's on the command line (argv[3:]). Returns
534// nonzero otherwise.
Tao Baoba9a42a2015-06-23 23:23:33 -0700535int applypatch_check(const char* filename, int num_patches,
536 char** const patch_sha1_str) {
Doug Zongkerc4351c72010-02-22 14:46:32 -0800537 FileContents file;
538 file.data = NULL;
Doug Zongker512536a2010-02-17 16:11:44 -0800539
Doug Zongkerc4351c72010-02-22 14:46:32 -0800540 // It's okay to specify no sha1s; the check will pass if the
Doug Zongkerf291d852010-07-07 13:55:25 -0700541 // LoadFileContents is successful. (Useful for reading
Doug Zongkerc4351c72010-02-22 14:46:32 -0800542 // partitions, where the filename encodes the sha1s; no need to
543 // check them twice.)
Doug Zongkera1bc1482014-02-13 15:18:19 -0800544 if (LoadFileContents(filename, &file) != 0 ||
Doug Zongkerc4351c72010-02-22 14:46:32 -0800545 (num_patches > 0 &&
546 FindMatchingPatch(file.sha1, patch_sha1_str, num_patches) < 0)) {
547 printf("file \"%s\" doesn't have any of expected "
548 "sha1 sums; checking cache\n", filename);
Doug Zongker512536a2010-02-17 16:11:44 -0800549
Doug Zongkerc4351c72010-02-22 14:46:32 -0800550 free(file.data);
Doug Zongker1c43c972012-02-28 11:07:09 -0800551 file.data = NULL;
Doug Zongker512536a2010-02-17 16:11:44 -0800552
Doug Zongkerc4351c72010-02-22 14:46:32 -0800553 // If the source file is missing or corrupted, it might be because
554 // we were killed in the middle of patching it. A copy of it
555 // should have been made in CACHE_TEMP_SOURCE. If that file
556 // exists and matches the sha1 we're looking for, the check still
557 // passes.
558
Doug Zongkera1bc1482014-02-13 15:18:19 -0800559 if (LoadFileContents(CACHE_TEMP_SOURCE, &file) != 0) {
Doug Zongkerc4351c72010-02-22 14:46:32 -0800560 printf("failed to load cache file\n");
561 return 1;
562 }
563
564 if (FindMatchingPatch(file.sha1, patch_sha1_str, num_patches) < 0) {
565 printf("cache bits don't match any sha1 for \"%s\"\n", filename);
566 free(file.data);
567 return 1;
568 }
569 }
Doug Zongker512536a2010-02-17 16:11:44 -0800570
571 free(file.data);
Doug Zongkerc4351c72010-02-22 14:46:32 -0800572 return 0;
Doug Zongker512536a2010-02-17 16:11:44 -0800573}
574
575int ShowLicenses() {
Doug Zongkerc4351c72010-02-22 14:46:32 -0800576 ShowBSDiffLicense();
577 return 0;
Doug Zongker512536a2010-02-17 16:11:44 -0800578}
579
Doug Zongkerbc7ffed2014-08-15 14:31:52 -0700580ssize_t FileSink(const unsigned char* data, ssize_t len, void* token) {
Tao Baoba9a42a2015-06-23 23:23:33 -0700581 int fd = *reinterpret_cast<int *>(token);
Doug Zongkerc4351c72010-02-22 14:46:32 -0800582 ssize_t done = 0;
583 ssize_t wrote;
Tao Baoba9a42a2015-06-23 23:23:33 -0700584 while (done < len) {
Elliott Hughes7bad7c42015-04-28 17:24:24 -0700585 wrote = TEMP_FAILURE_RETRY(write(fd, data+done, len-done));
586 if (wrote == -1) {
Tao Baoba9a42a2015-06-23 23:23:33 -0700587 printf("error writing %zd bytes: %s\n", (len-done), strerror(errno));
Doug Zongkerc4351c72010-02-22 14:46:32 -0800588 return done;
589 }
590 done += wrote;
Doug Zongker512536a2010-02-17 16:11:44 -0800591 }
Doug Zongkerc4351c72010-02-22 14:46:32 -0800592 return done;
Doug Zongker512536a2010-02-17 16:11:44 -0800593}
594
595typedef struct {
Doug Zongkerc4351c72010-02-22 14:46:32 -0800596 unsigned char* buffer;
597 ssize_t size;
598 ssize_t pos;
Doug Zongker512536a2010-02-17 16:11:44 -0800599} MemorySinkInfo;
600
Doug Zongkerbc7ffed2014-08-15 14:31:52 -0700601ssize_t MemorySink(const unsigned char* data, ssize_t len, void* token) {
Tao Baoba9a42a2015-06-23 23:23:33 -0700602 MemorySinkInfo* msi = reinterpret_cast<MemorySinkInfo*>(token);
Doug Zongkerc4351c72010-02-22 14:46:32 -0800603 if (msi->size - msi->pos < len) {
604 return -1;
605 }
606 memcpy(msi->buffer + msi->pos, data, len);
607 msi->pos += len;
608 return len;
Doug Zongker512536a2010-02-17 16:11:44 -0800609}
610
611// Return the amount of free space (in bytes) on the filesystem
612// containing filename. filename must exist. Return -1 on error.
613size_t FreeSpaceForFile(const char* filename) {
Doug Zongkerc4351c72010-02-22 14:46:32 -0800614 struct statfs sf;
615 if (statfs(filename, &sf) != 0) {
616 printf("failed to statfs %s: %s\n", filename, strerror(errno));
617 return -1;
618 }
caozhiyuan3b497762015-05-19 17:21:00 +0800619 return sf.f_bsize * sf.f_bavail;
Doug Zongker512536a2010-02-17 16:11:44 -0800620}
621
Doug Zongkerc4351c72010-02-22 14:46:32 -0800622int CacheSizeCheck(size_t bytes) {
623 if (MakeFreeSpaceOnCache(bytes) < 0) {
624 printf("unable to make %ld bytes available on /cache\n", (long)bytes);
625 return 1;
626 } else {
627 return 0;
628 }
629}
630
Doug Zongkerbf80f492012-10-19 12:24:26 -0700631static void print_short_sha1(const uint8_t sha1[SHA_DIGEST_SIZE]) {
Doug Zongkerbf80f492012-10-19 12:24:26 -0700632 const char* hex = "0123456789abcdef";
Tao Baoba9a42a2015-06-23 23:23:33 -0700633 for (size_t i = 0; i < 4; ++i) {
Doug Zongkerbf80f492012-10-19 12:24:26 -0700634 putchar(hex[(sha1[i]>>4) & 0xf]);
635 putchar(hex[sha1[i] & 0xf]);
636 }
637}
Doug Zongkerc4351c72010-02-22 14:46:32 -0800638
639// This function applies binary patches to files in a way that is safe
Doug Zongker512536a2010-02-17 16:11:44 -0800640// (the original file is not touched until we have the desired
641// replacement for it) and idempotent (it's okay to run this program
642// multiple times).
643//
Doug Zongkerc4351c72010-02-22 14:46:32 -0800644// - if the sha1 hash of <target_filename> is <target_sha1_string>,
645// does nothing and exits successfully.
Doug Zongker512536a2010-02-17 16:11:44 -0800646//
Doug Zongkerc4351c72010-02-22 14:46:32 -0800647// - otherwise, if the sha1 hash of <source_filename> is one of the
648// entries in <patch_sha1_str>, the corresponding patch from
649// <patch_data> (which must be a VAL_BLOB) is applied to produce a
650// new file (the type of patch is automatically detected from the
651// blob daat). If that new file has sha1 hash <target_sha1_str>,
652// moves it to replace <target_filename>, and exits successfully.
653// Note that if <source_filename> and <target_filename> are not the
654// same, <source_filename> is NOT deleted on success.
655// <target_filename> may be the string "-" to mean "the same as
656// source_filename".
Doug Zongker512536a2010-02-17 16:11:44 -0800657//
658// - otherwise, or if any error is encountered, exits with non-zero
659// status.
660//
Doug Zongkerf291d852010-07-07 13:55:25 -0700661// <source_filename> may refer to a partition to read the source data.
662// See the comments for the LoadPartition Contents() function above
Doug Zongkerc4351c72010-02-22 14:46:32 -0800663// for the format of such a filename.
Doug Zongker512536a2010-02-17 16:11:44 -0800664
Doug Zongkerc4351c72010-02-22 14:46:32 -0800665int applypatch(const char* source_filename,
666 const char* target_filename,
667 const char* target_sha1_str,
668 size_t target_size,
669 int num_patches,
670 char** const patch_sha1_str,
Doug Zongkera3ccba62012-08-20 15:28:02 -0700671 Value** patch_data,
672 Value* bonus_data) {
Doug Zongkerbf80f492012-10-19 12:24:26 -0700673 printf("patch %s: ", source_filename);
Doug Zongker512536a2010-02-17 16:11:44 -0800674
Tao Baoba9a42a2015-06-23 23:23:33 -0700675 if (target_filename[0] == '-' && target_filename[1] == '\0') {
Doug Zongkerc4351c72010-02-22 14:46:32 -0800676 target_filename = source_filename;
Doug Zongker512536a2010-02-17 16:11:44 -0800677 }
678
Doug Zongkerc4351c72010-02-22 14:46:32 -0800679 uint8_t target_sha1[SHA_DIGEST_SIZE];
680 if (ParseSha1(target_sha1_str, target_sha1) != 0) {
681 printf("failed to parse tgt-sha1 \"%s\"\n", target_sha1_str);
Doug Zongker512536a2010-02-17 16:11:44 -0800682 return 1;
Doug Zongkerc4351c72010-02-22 14:46:32 -0800683 }
Doug Zongker512536a2010-02-17 16:11:44 -0800684
Doug Zongkerc4351c72010-02-22 14:46:32 -0800685 FileContents copy_file;
686 FileContents source_file;
Doug Zongker1c43c972012-02-28 11:07:09 -0800687 copy_file.data = NULL;
688 source_file.data = NULL;
Doug Zongkerc4351c72010-02-22 14:46:32 -0800689 const Value* source_patch_value = NULL;
690 const Value* copy_patch_value = NULL;
Doug Zongker512536a2010-02-17 16:11:44 -0800691
Doug Zongkerc4351c72010-02-22 14:46:32 -0800692 // We try to load the target file into the source_file object.
Doug Zongkera1bc1482014-02-13 15:18:19 -0800693 if (LoadFileContents(target_filename, &source_file) == 0) {
Doug Zongkerc4351c72010-02-22 14:46:32 -0800694 if (memcmp(source_file.sha1, target_sha1, SHA_DIGEST_SIZE) == 0) {
695 // The early-exit case: the patch was already applied, this file
696 // has the desired hash, nothing for us to do.
Doug Zongkerbf80f492012-10-19 12:24:26 -0700697 printf("already ");
698 print_short_sha1(target_sha1);
699 putchar('\n');
Doug Zongker1c43c972012-02-28 11:07:09 -0800700 free(source_file.data);
Doug Zongkerc4351c72010-02-22 14:46:32 -0800701 return 0;
702 }
703 }
Doug Zongker512536a2010-02-17 16:11:44 -0800704
Doug Zongkerc4351c72010-02-22 14:46:32 -0800705 if (source_file.data == NULL ||
706 (target_filename != source_filename &&
707 strcmp(target_filename, source_filename) != 0)) {
708 // Need to load the source file: either we failed to load the
709 // target file, or we did but it's different from the source file.
710 free(source_file.data);
Doug Zongker1c43c972012-02-28 11:07:09 -0800711 source_file.data = NULL;
Doug Zongkera1bc1482014-02-13 15:18:19 -0800712 LoadFileContents(source_filename, &source_file);
Doug Zongkerc4351c72010-02-22 14:46:32 -0800713 }
714
715 if (source_file.data != NULL) {
Tao Baoba9a42a2015-06-23 23:23:33 -0700716 int to_use = FindMatchingPatch(source_file.sha1, patch_sha1_str, num_patches);
Doug Zongkerc4351c72010-02-22 14:46:32 -0800717 if (to_use >= 0) {
718 source_patch_value = patch_data[to_use];
719 }
720 }
721
722 if (source_patch_value == NULL) {
723 free(source_file.data);
Doug Zongker1c43c972012-02-28 11:07:09 -0800724 source_file.data = NULL;
Doug Zongkerc4351c72010-02-22 14:46:32 -0800725 printf("source file is bad; trying copy\n");
726
Doug Zongkera1bc1482014-02-13 15:18:19 -0800727 if (LoadFileContents(CACHE_TEMP_SOURCE, &copy_file) < 0) {
Doug Zongkerc4351c72010-02-22 14:46:32 -0800728 // fail.
729 printf("failed to read copy file\n");
730 return 1;
Doug Zongker512536a2010-02-17 16:11:44 -0800731 }
732
Tao Baoba9a42a2015-06-23 23:23:33 -0700733 int to_use = FindMatchingPatch(copy_file.sha1, patch_sha1_str, num_patches);
Doug Zongker8cd9e4f2010-08-12 17:38:09 -0700734 if (to_use >= 0) {
Doug Zongkerc4351c72010-02-22 14:46:32 -0800735 copy_patch_value = patch_data[to_use];
Doug Zongker512536a2010-02-17 16:11:44 -0800736 }
737
Doug Zongkerc4351c72010-02-22 14:46:32 -0800738 if (copy_patch_value == NULL) {
739 // fail.
740 printf("copy file doesn't match source SHA-1s either\n");
Doug Zongker1c43c972012-02-28 11:07:09 -0800741 free(copy_file.data);
Doug Zongkerc4351c72010-02-22 14:46:32 -0800742 return 1;
Doug Zongker512536a2010-02-17 16:11:44 -0800743 }
Doug Zongker512536a2010-02-17 16:11:44 -0800744 }
745
Doug Zongker1c43c972012-02-28 11:07:09 -0800746 int result = GenerateTarget(&source_file, source_patch_value,
747 &copy_file, copy_patch_value,
748 source_filename, target_filename,
Doug Zongkera3ccba62012-08-20 15:28:02 -0700749 target_sha1, target_size, bonus_data);
Doug Zongker1c43c972012-02-28 11:07:09 -0800750 free(source_file.data);
751 free(copy_file.data);
752
753 return result;
754}
755
756static int GenerateTarget(FileContents* source_file,
757 const Value* source_patch_value,
758 FileContents* copy_file,
759 const Value* copy_patch_value,
760 const char* source_filename,
761 const char* target_filename,
762 const uint8_t target_sha1[SHA_DIGEST_SIZE],
Doug Zongkera3ccba62012-08-20 15:28:02 -0700763 size_t target_size,
764 const Value* bonus_data) {
Doug Zongkerc4351c72010-02-22 14:46:32 -0800765 int retry = 1;
766 SHA_CTX ctx;
767 int output;
768 MemorySinkInfo msi;
769 FileContents* source_to_use;
770 char* outname;
Doug Zongker1c43c972012-02-28 11:07:09 -0800771 int made_copy = 0;
Doug Zongkerc4351c72010-02-22 14:46:32 -0800772
773 // assume that target_filename (eg "/system/app/Foo.apk") is located
774 // on the same filesystem as its top-level directory ("/system").
775 // We need something that exists for calling statfs().
776 char target_fs[strlen(target_filename)+1];
777 char* slash = strchr(target_filename+1, '/');
778 if (slash != NULL) {
779 int count = slash - target_filename;
780 strncpy(target_fs, target_filename, count);
781 target_fs[count] = '\0';
Doug Zongker512536a2010-02-17 16:11:44 -0800782 } else {
Doug Zongkerc4351c72010-02-22 14:46:32 -0800783 strcpy(target_fs, target_filename);
Doug Zongker512536a2010-02-17 16:11:44 -0800784 }
785
Doug Zongkerc4351c72010-02-22 14:46:32 -0800786 do {
787 // Is there enough room in the target filesystem to hold the patched
788 // file?
789
Doug Zongkerf291d852010-07-07 13:55:25 -0700790 if (strncmp(target_filename, "MTD:", 4) == 0 ||
791 strncmp(target_filename, "EMMC:", 5) == 0) {
792 // If the target is a partition, we're actually going to
793 // write the output to /tmp and then copy it to the
794 // partition. statfs() always returns 0 blocks free for
795 // /tmp, so instead we'll just assume that /tmp has enough
796 // space to hold the file.
Doug Zongkerc4351c72010-02-22 14:46:32 -0800797
Doug Zongkerf291d852010-07-07 13:55:25 -0700798 // We still write the original source to cache, in case
799 // the partition write is interrupted.
Doug Zongker1c43c972012-02-28 11:07:09 -0800800 if (MakeFreeSpaceOnCache(source_file->size) < 0) {
Doug Zongkerc4351c72010-02-22 14:46:32 -0800801 printf("not enough free space on /cache\n");
802 return 1;
803 }
804 if (SaveFileContents(CACHE_TEMP_SOURCE, source_file) < 0) {
805 printf("failed to back up source file\n");
806 return 1;
807 }
808 made_copy = 1;
809 retry = 0;
810 } else {
811 int enough_space = 0;
812 if (retry > 0) {
813 size_t free_space = FreeSpaceForFile(target_fs);
Doug Zongker201cd462010-08-13 09:41:21 -0700814 enough_space =
815 (free_space > (256 << 10)) && // 256k (two-block) minimum
Doug Zongkerc4351c72010-02-22 14:46:32 -0800816 (free_space > (target_size * 3 / 2)); // 50% margin of error
Doug Zongkerbf80f492012-10-19 12:24:26 -0700817 if (!enough_space) {
Tao Baoba9a42a2015-06-23 23:23:33 -0700818 printf("target %zu bytes; free space %zu bytes; retry %d; enough %d\n",
819 target_size, free_space, retry, enough_space);
Doug Zongkerbf80f492012-10-19 12:24:26 -0700820 }
Doug Zongkerc4351c72010-02-22 14:46:32 -0800821 }
822
823 if (!enough_space) {
824 retry = 0;
825 }
826
827 if (!enough_space && source_patch_value != NULL) {
828 // Using the original source, but not enough free space. First
829 // copy the source file to cache, then delete it from the original
830 // location.
831
Doug Zongkerf291d852010-07-07 13:55:25 -0700832 if (strncmp(source_filename, "MTD:", 4) == 0 ||
833 strncmp(source_filename, "EMMC:", 5) == 0) {
Doug Zongkerc4351c72010-02-22 14:46:32 -0800834 // It's impossible to free space on the target filesystem by
Doug Zongkerf291d852010-07-07 13:55:25 -0700835 // deleting the source if the source is a partition. If
Doug Zongkerc4351c72010-02-22 14:46:32 -0800836 // we're ever in a state where we need to do this, fail.
Tao Baoba9a42a2015-06-23 23:23:33 -0700837 printf("not enough free space for target but source is partition\n");
Doug Zongkerc4351c72010-02-22 14:46:32 -0800838 return 1;
839 }
840
Doug Zongker1c43c972012-02-28 11:07:09 -0800841 if (MakeFreeSpaceOnCache(source_file->size) < 0) {
Doug Zongkerc4351c72010-02-22 14:46:32 -0800842 printf("not enough free space on /cache\n");
843 return 1;
844 }
845
846 if (SaveFileContents(CACHE_TEMP_SOURCE, source_file) < 0) {
847 printf("failed to back up source file\n");
848 return 1;
849 }
850 made_copy = 1;
851 unlink(source_filename);
852
853 size_t free_space = FreeSpaceForFile(target_fs);
Tao Baoba9a42a2015-06-23 23:23:33 -0700854 printf("(now %zu bytes free for target) ", free_space);
Doug Zongkerc4351c72010-02-22 14:46:32 -0800855 }
856 }
857
858 const Value* patch;
859 if (source_patch_value != NULL) {
Doug Zongker1c43c972012-02-28 11:07:09 -0800860 source_to_use = source_file;
Doug Zongkerc4351c72010-02-22 14:46:32 -0800861 patch = source_patch_value;
862 } else {
Doug Zongker1c43c972012-02-28 11:07:09 -0800863 source_to_use = copy_file;
Doug Zongkerc4351c72010-02-22 14:46:32 -0800864 patch = copy_patch_value;
865 }
866
867 if (patch->type != VAL_BLOB) {
868 printf("patch is not a blob\n");
869 return 1;
870 }
871
872 SinkFn sink = NULL;
873 void* token = NULL;
874 output = -1;
875 outname = NULL;
Doug Zongkerf291d852010-07-07 13:55:25 -0700876 if (strncmp(target_filename, "MTD:", 4) == 0 ||
877 strncmp(target_filename, "EMMC:", 5) == 0) {
Doug Zongkerc4351c72010-02-22 14:46:32 -0800878 // We store the decoded output in memory.
Tao Baoba9a42a2015-06-23 23:23:33 -0700879 msi.buffer = reinterpret_cast<unsigned char*>(malloc(target_size));
Doug Zongkerc4351c72010-02-22 14:46:32 -0800880 if (msi.buffer == NULL) {
Tao Baoba9a42a2015-06-23 23:23:33 -0700881 printf("failed to alloc %zu bytes for output\n", target_size);
Doug Zongkerc4351c72010-02-22 14:46:32 -0800882 return 1;
883 }
884 msi.pos = 0;
885 msi.size = target_size;
886 sink = MemorySink;
887 token = &msi;
888 } else {
889 // We write the decoded output to "<tgt-file>.patch".
Tao Baoba9a42a2015-06-23 23:23:33 -0700890 outname = reinterpret_cast<char*>(malloc(strlen(target_filename) + 10));
Doug Zongkerc4351c72010-02-22 14:46:32 -0800891 strcpy(outname, target_filename);
892 strcat(outname, ".patch");
893
Tao Baoba9a42a2015-06-23 23:23:33 -0700894 output = open(outname, O_WRONLY | O_CREAT | O_TRUNC | O_SYNC, S_IRUSR | S_IWUSR);
Doug Zongkerc4351c72010-02-22 14:46:32 -0800895 if (output < 0) {
896 printf("failed to open output file %s: %s\n",
897 outname, strerror(errno));
898 return 1;
899 }
900 sink = FileSink;
901 token = &output;
902 }
903
904 char* header = patch->data;
905 ssize_t header_bytes_read = patch->size;
906
907 SHA_init(&ctx);
908
909 int result;
910
911 if (header_bytes_read >= 8 &&
912 memcmp(header, "BSDIFF40", 8) == 0) {
913 result = ApplyBSDiffPatch(source_to_use->data, source_to_use->size,
914 patch, 0, sink, token, &ctx);
915 } else if (header_bytes_read >= 8 &&
916 memcmp(header, "IMGDIFF2", 8) == 0) {
917 result = ApplyImagePatch(source_to_use->data, source_to_use->size,
Doug Zongkera3ccba62012-08-20 15:28:02 -0700918 patch, sink, token, &ctx, bonus_data);
Doug Zongkerc4351c72010-02-22 14:46:32 -0800919 } else {
920 printf("Unknown patch file format\n");
921 return 1;
922 }
923
924 if (output >= 0) {
Michael Rungebe81e512014-10-29 12:42:15 -0700925 if (fsync(output) != 0) {
926 printf("failed to fsync file \"%s\" (%s)\n", outname, strerror(errno));
927 result = 1;
928 }
929 if (close(output) != 0) {
930 printf("failed to close file \"%s\" (%s)\n", outname, strerror(errno));
931 result = 1;
932 }
Doug Zongkerc4351c72010-02-22 14:46:32 -0800933 }
934
935 if (result != 0) {
936 if (retry == 0) {
937 printf("applying patch failed\n");
938 return result != 0;
939 } else {
940 printf("applying patch failed; retrying\n");
941 }
942 if (outname != NULL) {
943 unlink(outname);
944 }
945 } else {
946 // succeeded; no need to retry
947 break;
948 }
949 } while (retry-- > 0);
950
951 const uint8_t* current_target_sha1 = SHA_final(&ctx);
952 if (memcmp(current_target_sha1, target_sha1, SHA_DIGEST_SIZE) != 0) {
953 printf("patch did not produce expected sha1\n");
Doug Zongker512536a2010-02-17 16:11:44 -0800954 return 1;
Doug Zongkerbf80f492012-10-19 12:24:26 -0700955 } else {
956 printf("now ");
957 print_short_sha1(target_sha1);
958 putchar('\n');
Doug Zongkerc4351c72010-02-22 14:46:32 -0800959 }
960
961 if (output < 0) {
Doug Zongkerf291d852010-07-07 13:55:25 -0700962 // Copy the temp file to the partition.
963 if (WriteToPartition(msi.buffer, msi.pos, target_filename) != 0) {
Doug Zongkerc4351c72010-02-22 14:46:32 -0800964 printf("write of patched data to %s failed\n", target_filename);
965 return 1;
966 }
967 free(msi.buffer);
Doug Zongker512536a2010-02-17 16:11:44 -0800968 } else {
Doug Zongkerc4351c72010-02-22 14:46:32 -0800969 // Give the .patch file the same owner, group, and mode of the
970 // original source file.
971 if (chmod(outname, source_to_use->st.st_mode) != 0) {
972 printf("chmod of \"%s\" failed: %s\n", outname, strerror(errno));
973 return 1;
974 }
Tao Baoba9a42a2015-06-23 23:23:33 -0700975 if (chown(outname, source_to_use->st.st_uid, source_to_use->st.st_gid) != 0) {
Doug Zongkerc4351c72010-02-22 14:46:32 -0800976 printf("chown of \"%s\" failed: %s\n", outname, strerror(errno));
977 return 1;
978 }
Doug Zongker512536a2010-02-17 16:11:44 -0800979
Doug Zongkerc4351c72010-02-22 14:46:32 -0800980 // Finally, rename the .patch file to replace the target file.
981 if (rename(outname, target_filename) != 0) {
Tao Baoba9a42a2015-06-23 23:23:33 -0700982 printf("rename of .patch to \"%s\" failed: %s\n", target_filename, strerror(errno));
Doug Zongkerc4351c72010-02-22 14:46:32 -0800983 return 1;
984 }
Doug Zongker512536a2010-02-17 16:11:44 -0800985 }
986
Doug Zongkerc4351c72010-02-22 14:46:32 -0800987 // If this run of applypatch created the copy, and we're here, we
988 // can delete it.
Tao Baoba9a42a2015-06-23 23:23:33 -0700989 if (made_copy) {
990 unlink(CACHE_TEMP_SOURCE);
991 }
Doug Zongker512536a2010-02-17 16:11:44 -0800992
Doug Zongkerc4351c72010-02-22 14:46:32 -0800993 // Success!
994 return 0;
Doug Zongker512536a2010-02-17 16:11:44 -0800995}