forked from xiaolu/android_bootable_recovery
-
Notifications
You must be signed in to change notification settings - Fork 0
/
nandroid_md5.c
442 lines (399 loc) · 13.3 KB
/
nandroid_md5.c
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
/*
* Copyright (C) 2014 The CyanogenMod Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include <dirent.h>
#include <fcntl.h>
#include <limits.h>
#include <openssl/md5.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/mman.h>
#include <sys/types.h>
#include <unistd.h>
#include "common.h"
#include "extendedcommands.h"
#include "nandroid.h"
#include "nandroid_md5.h"
#include "recovery_ui.h"
#define MAX_FILES_CHECKED 20
#define HASH_LENGTH 2*MD5_DIGEST_LENGTH
#define BUFSIZE 1024
typedef struct {
int is_missing;
char *filename;
} MissingFiles;
static void to_md5_hash(char *str, unsigned char* md) {
int i;
for (i = 0; i < MD5_DIGEST_LENGTH; i++)
sprintf(&str[2*i], "%02x", (unsigned int)md[i]);
str[HASH_LENGTH] = '\0';
}
static int calculate_md5(char *str, const char *path) {
FILE *fd;
fd = fopen(path, "r");
if (fd != NULL) {
set_perf_mode(1);
MD5_CTX c;
size_t i;
static unsigned char buf[BUFSIZE];
unsigned char md5dig[MD5_DIGEST_LENGTH];
MD5_Init(&c);
while ((i = fread(buf, 1, BUFSIZE, fd)) > 0)
MD5_Update(&c, buf, i);
MD5_Final(&(md5dig[0]), &c);
fclose(fd);
to_md5_hash(str, md5dig);
set_perf_mode(0);
} else {
return 1;
}
return 0;
}
static int is_selected_for_restore(const char *file, const unsigned char flags) {
int check_boot = ((flags & NANDROID_BOOT) == NANDROID_BOOT);
int check_system = ((flags & NANDROID_SYSTEM) == NANDROID_SYSTEM);
int check_data = ((flags & NANDROID_DATA) == NANDROID_DATA);
int check_cache = ((flags & NANDROID_CACHE) == NANDROID_CACHE);
int check_sdext = ((flags & NANDROID_SDEXT) == NANDROID_SDEXT);
int check_wimax = ((flags & NANDROID_WIMAX) == NANDROID_WIMAX);
if (check_boot && strstr(file, "boot"))
return 1;
if (check_system && strstr(file, "system"))
return 1;
if (check_data && (strstr(file, "data") || strstr(file, "android_secure")))
return 1;
if (check_cache && strstr(file, "cache"))
return 1;
if (check_sdext && strstr(file, "sd-ext"))
return 1;
if (check_wimax && strstr(file, "wimax"))
return 1;
return 0;
}
int nandroid_backup_md5_gen(const char *backup_path) {
DIR *dp;
FILE *fd;
int i = 0;
int j = 0;
int len = 0;
int ret = 0;
int filecount = 0;
// Dynamically allocated, free them at the end
char *filenames[MAX_FILES_CHECKED];
char *filepaths[MAX_FILES_CHECKED];
char path[PATH_MAX];
snprintf(path, PATH_MAX, "%s", backup_path);
len = strlen(path);
if (path[len-1] == '/')
path[len-1] = '\0';
ui_print("Generating MD5 checksums...\n");
// Read files available in backup path
dp = opendir(path);
if (dp != NULL) {
struct dirent *ep;
while ((ep = readdir(dp)) && i < MAX_FILES_CHECKED) {
if (strcmp(ep->d_name, ".") != 0 && strcmp(ep->d_name, "..") != 0
&& strcmp(ep->d_name, "recovery.log") != 0
&& strcmp(ep->d_name, "nandroid.md5") != 0) {
len = strlen(ep->d_name);
filenames[i] = malloc(sizeof(char[len+1]));
snprintf(filenames[i], len+1, "%s", ep->d_name);
len += 1 + strlen(path);
filepaths[i] = malloc(sizeof(char[len+1]));
snprintf(filepaths[i], len+1, "%s/%s", path, ep->d_name);
i++;
}
}
closedir(dp);
filecount = i;
}
if (filecount == 0) {
ret = -1;
LOGE("No files found in %s for MD5 generation\n", path);
goto out;
}
// Prepare backup_path/nandroid.md5 for writing
char md5path[PATH_MAX];
snprintf(md5path, PATH_MAX, "%s/%s", path, "nandroid.md5");
fd = fopen(md5path, "w");
if (fd == NULL) {
ret = -1;
LOGE("Unable to create nandroid.md5\n");
goto out;
}
// Generate MD5s and save to nandroid.md5
char md5calc[HASH_LENGTH+1];
char tmp[PATH_MAX];
for (i = 0; i < filecount; i++) {
if (calculate_md5(md5calc, filepaths[i]) != 0) {
LOGE("Unable to generate MD5 for %s\n", filenames[i]);
// Attempt to continue for other files
} else {
snprintf(tmp, PATH_MAX, "%s %s\n", md5calc, filenames[i]);
fputs(tmp, fd);
}
}
fclose(fd);
ui_print("MD5 checksums generated\n");
out:
for (i = 0; i < filecount; i++) {
free(filenames[i]);
free(filepaths[i]);
}
return ret;
}
int nandroid_restore_md5_check(const char *backup_path, unsigned char flags) {
DIR *dp;
FILE *fd;
int i = 0;
int j = 0;
int len = 0;
int ret = 0;
int filecount = 0;
int md5count = 0;
int use_ui = is_ui_initialized();
if (empty_nandroid_bitmask(flags)) {
LOGE("Nothing selected for restore.\n");
return -1;
}
// Dynamically allocated, free them at the end
char *filenames[MAX_FILES_CHECKED];
char *filepaths[MAX_FILES_CHECKED];
char *md5files[MAX_FILES_CHECKED];
char *md5hashes[MAX_FILES_CHECKED];
int mf_allocated = 0; // for MissingFiles *mf
int mm_allocated = 0; // for MissingFiles *mm
char path[PATH_MAX];
snprintf(path, PATH_MAX, "%s", backup_path);
len = strlen(path);
if (path[len-1] == '/')
path[len-1] = '\0';
ui_print("Checking MD5 sums...\n");
// Read files available in backup path
dp = opendir(path);
if (dp != NULL) {
struct dirent *ep;
while ((ep = readdir(dp)) && i < MAX_FILES_CHECKED) {
if (is_selected_for_restore(ep->d_name, flags)) {
len = strlen(ep->d_name);
filenames[i] = malloc(sizeof(char[len+1]));
snprintf(filenames[i], len+1, "%s", ep->d_name);
len += 1 + strlen(path);
filepaths[i] = malloc(sizeof(char[len+1]));
snprintf(filepaths[i], len+1, "%s/%s", path, ep->d_name);
i++;
}
}
closedir(dp);
filecount = i;
}
if (filecount == 0) {
ret = -1;
LOGE("No backup files found in %s\n", path);
goto out;
}
// Read files + hashes available in nandroid.md5
i = 0;
char md5path[PATH_MAX];
snprintf(md5path, PATH_MAX, "%s/%s", path, "nandroid.md5");
fd = fopen(md5path, "r");
if (fd != NULL) {
char tmp[PATH_MAX];
while (fgets(tmp, PATH_MAX, fd) && i < MAX_FILES_CHECKED) {
if (tmp[strlen(tmp)-1] == '\n')
tmp[strlen(tmp)-1] = '\0';
if (is_selected_for_restore(tmp, flags)) {
md5hashes[i] = malloc(sizeof(char[HASH_LENGTH+1]));
snprintf(md5hashes[i], HASH_LENGTH+1, "%s", tmp);
// md5 hash is followed by two spaces
len = strlen(tmp) - (HASH_LENGTH+2);
md5files[i] = malloc(sizeof(char[len+1]));
snprintf(md5files[i], len+1, "%s", &tmp[HASH_LENGTH+2]);
i++;
}
}
fclose(fd);
md5count = i;
}
#if DEBUG_MD5_CHECKER
LOGI("[MD5] backup_path: %s\n", path);
for (i = 0; i < filecount; i++) {
LOGI("[MD5] files in path: %s\n", filenames[i]);
}
for (i = 0; i < md5count; i++) {
LOGI("[MD5] reference: %s: %s\n", md5files[i], md5hashes[i]);
}
#endif
// Cross-reference files in directory to those in nandroid.md5
// Mark files that are in nandroid.md5 but not in directory (potentially fatal)
int foundfile;
int totalmissing = 0;
MissingFiles *mm = malloc(md5count * sizeof(MissingFiles));
mm_allocated = 1;
for (i = 0; i < md5count; i++) {
foundfile = 0;
for (j = 0; j < filecount; j++) {
if (strcmp(md5files[i], filenames[j]) == 0) {
mm[i] = (MissingFiles){ 0, "" };
foundfile = 1;
}
}
if (!foundfile) {
mm[i] = (MissingFiles){ 1, md5files[i] };
totalmissing++;
}
}
// Warn user of failure for missing files
if (totalmissing && use_ui) {
int uiback = ui_is_showing_back_button();
ui_set_showing_back_button(0);
const char* headers[totalmissing+8];
headers[0] = "Backup files are missing:";
int hi = 1;
for (i = 0; i < md5count; i++) {
if (mm[i].is_missing)
headers[hi++] = mm[i].filename;
}
headers[totalmissing+1] = "";
headers[totalmissing+2] = "Attempting to restore any";
headers[totalmissing+3] = "of these will fail.";
headers[totalmissing+4] = "";
headers[totalmissing+5] = "Continue anyways?";
headers[totalmissing+6] = "";
headers[totalmissing+7] = NULL;
static char* list[] = { "Yes", "No", NULL };
int chosen_item = get_menu_selection(headers, list, 0, 0);
if (chosen_item == 0) {
ui_set_showing_back_button(uiback);
} else {
ret = -1;
ui_set_showing_back_button(uiback);
LOGE("Aborting\n");
goto out;
}
} else if (totalmissing) {
// No UI, so no prompt possible; fail the restore
ret = -1;
LOGE("Backup files are missing:\n");
for (i = 0; i < md5count; i++) {
if (mm[i].is_missing)
LOGE("%s\n", mm[i].filename);
}
LOGE("Aborting\n");
goto out;
}
// Cross-reference files in directory to those in nandroid.md5
// Mark files that are in directory but not in nandroid.md5 (non-fatal)
totalmissing = 0;
MissingFiles *mf = malloc(filecount * sizeof(MissingFiles));
mf_allocated = 1;
for (i = 0; i < filecount; i++) {
foundfile = 0;
// Ignore files that are not scheduled for restore
if (!is_selected_for_restore(filenames[i], flags)) {
mf[i] = (MissingFiles){ 0, "" };
continue;
}
for (j = 0; j < md5count; j++) {
if (strcmp(filenames[i], md5files[j]) == 0) {
mf[i] = (MissingFiles){ 0, "" };
foundfile = 1;
}
}
if (!foundfile) {
mf[i] = (MissingFiles){ 1, filenames[i] };
totalmissing++;
}
}
// Warn user about missing md5 references for files
if (totalmissing && use_ui) {
int uiback = ui_is_showing_back_button();
ui_set_showing_back_button(0);
const char* headers[totalmissing+5];
headers[0] = "Could not find reference MD5 for:";
int hi = 1;
for (i = 0; i < filecount; i++) {
if (mf[i].is_missing)
headers[hi++] = mf[i].filename;
}
headers[totalmissing+1] = "";
headers[totalmissing+2] = "Continue anyways?";
headers[totalmissing+3] = "";
headers[totalmissing+4] = NULL;
static char* list[] = { "Yes", "No", NULL };
int chosen_item = get_menu_selection(headers, list, 0, 0);
if (chosen_item == 0) {
ui_set_showing_back_button(uiback);
} else{
ret = -1;
ui_set_showing_back_button(uiback);
LOGE("Aborting\n");
goto out;
}
} else if (totalmissing) {
// No UI, so no prompt possible; fail the restore
ret = -1;
LOGE("Could not find reference MD5 for:\n");
for (i = 0; i < filecount; i++) {
if (mf[i].is_missing)
LOGE("%s\n", mf[i].filename);
}
LOGE("Aborting\n");
goto out;
}
// Compare MD5s of non-missing files that are selected for restore
int md5matches = 0;
char md5calc[HASH_LENGTH+1];
for (i = 0; i < filecount; i++) {
if (!is_selected_for_restore(filenames[i], flags))
continue;
for (j = 0; j < md5count; j++) {
if (strcmp(filenames[i], md5files[j]) == 0) {
if (calculate_md5(md5calc, filepaths[i]) != 0) {
ret = -1;
LOGE("Unable to check MD5 of %s\nAborting\n", filenames[i]);
goto out;
}
if (strcmp(md5calc, md5hashes[j]) != 0) {
ret = -1;
LOGE("MD5 mismatch for %s\nAborting\n", filenames[i]);
goto out;
} else {
md5matches++;
}
}
}
}
if (md5matches) {
ui_print("All MD5 checksums verified\n");
} else {
ui_print("No MD5 verification performed\n");
}
out:
if (mf_allocated)
free(mf);
if (mm_allocated)
free(mm);
for (i = 0; i < filecount; i++) {
free(filenames[i]);
free(filepaths[i]);
}
for (i = 0; i < md5count; i++) {
free(md5files[i]);
free(md5hashes[i]);
}
return ret;
}