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
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
|
/* Compute MD5 checksum of files or strings according to the definition
of MD5 in RFC 1321 from April 1992.
Copyright (C) 95, 1996 Free Software Foundation, Inc.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2, or (at your option)
any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software Foundation,
Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
/* Written by Ulrich Drepper <drepper@gnu.ai.mit.edu>. */
#ifdef HAVE_CONFIG_H
# include <config.h>
#endif
#include <getopt.h>
#include <stdio.h>
#include <sys/types.h>
#include "long-options.h"
#include "md5.h"
#include "getline.h"
#include "system.h"
#include "error.h"
/* Most systems do not distinguish between external and internal
text representations. */
#if UNIX || __UNIX__ || unix || __unix__ || _POSIX_VERSION
# define OPENOPTS(BINARY) "r"
#else
# ifdef MSDOS
# define TEXT1TO1 "rb"
# define TEXTCNVT "r"
# else
# if defined VMS
# define TEXT1TO1 "rb", "ctx=stm"
# define TEXTCNVT "r", "ctx=stm"
# else
/* The following line is intended to evoke an error.
Using #error is not portable enough. */
"Cannot determine system type."
# endif
# endif
# define OPENOPTS(BINARY) ((BINARY) != 0 ? TEXT1TO1 : TEXTCNVT)
#endif
#if _LIBC || STDC_HEADERS
# define TOLOWER(c) tolower (c)
#else
# define TOLOWER(c) (ISUPPER (c) ? tolower (c) : (c))
#endif
/* The string with which to replace NEWLINE characters in filenames.
This is required to make it so md5sum --check can parse the output
of `md5sum FILENAME' for FILENAME contain NL characters. */
#define NEWLINE_REPLACEMENT_STRING "<\"NL'\\>"
#define NEWLINE_REPLACEMENT_STRING_LENGTH \
(sizeof (NEWLINE_REPLACEMENT_STRING) - 1)
/* Nonzero if any of the files read were the standard input. */
static int have_read_stdin;
/* With --check, don't generate any output.
The exit code indicates success or failure. */
static int status_only = 0;
/* With --check, print a message to standard error warning about each
improperly formatted MD5 checksum line. */
static int warn = 0;
/* The name this program was run with. */
char *program_name;
static const struct option long_options[] =
{
{ "binary", no_argument, 0, 'b' },
{ "check", no_argument, 0, 'c' },
{ "status", no_argument, 0, 2 },
{ "string", required_argument, 0, 1 },
{ "text", no_argument, 0, 't' },
{ "warn", no_argument, 0, 'w' },
{ NULL, 0, NULL, 0 }
};
char *xmalloc ();
static void
usage (int status)
{
if (status != 0)
fprintf (stderr, _("Try `%s --help' for more information.\n"),
program_name);
else
printf (_("\
Usage: %s [OPTION] [FILE]...\n\
or: %s [OPTION] --check [FILE]\n\
or: %s [OPTION] --string=STRING ...\n\
Print or check MD5 checksums.\n\
With no FILE, or when FILE is -, read standard input.\n\
\n\
-b, --binary read files in binary mode\n\
-t, --text read files in text mode (default)\n\
-c, --check check MD5 sums against given list\n\
\n\
The following two options are useful only when verifying checksums:\n\
--status don't output anything, status code shows success\n\
-w, --warn warn about improperly formated MD5 checksum lines\n\
\n\
--string=STRING compute checksum for STRING\n\
--help display this help and exit\n\
--version output version information and exit\n\
\n\
The sums are computed as described in RFC 1321. When checking, the input\n\
should be a former output of this program. The default mode is to print\n\
a line with checksum, a character indicating type (`*' for binary, ` ' for\n\
text), and name for each FILE.\n"),
program_name, program_name, program_name);
exit (status == 0 ? EXIT_SUCCESS : EXIT_FAILURE);
}
static int
split_3 (char *s, size_t s_len, char **u, int *binary, char **w)
{
size_t i;
#define ISWHITE(c) ((c) == ' ' || (c) == '\t')
i = 0;
while (ISWHITE (s[i]))
++i;
/* The line must have at least 35 more characters to contain correct
message digest information. */
if (s_len - i >= 32 + 2 + 1)
{
char *p;
*u = &s[i];
/* The first field has to be the 32-character hexadecimal
representation of the message digest. If it is not followed
immediately by a white space it's an error. */
i += 32;
if (!ISWHITE (s[i]))
return 1;
s[i++] = '\0';
if (s[i] != ' ' && s[i] != '*')
return 1;
*binary = (s[i++] == '*');
/* All characters between the type indicator and end of line are
significant -- that includes leading and trailing white space. */
*w = &s[i];
/* Translate each NEWLINE_REPLACEMENT_STRING in the file name
to a NEWLINE. */
p = &s[i];
while ((p = strstr (p, NEWLINE_REPLACEMENT_STRING)))
{
size_t len;
*p++ = '\n';
len = s_len - (p - s) - (NEWLINE_REPLACEMENT_STRING_LENGTH - 1) + 1;
memmove (p, p + NEWLINE_REPLACEMENT_STRING_LENGTH - 1, len);
s_len -= NEWLINE_REPLACEMENT_STRING_LENGTH - 1;
}
return 0;
}
return 1;
}
static int
hex_digits (const char *s)
{
while (*s)
{
if (!ISXDIGIT (*s))
return 0;
++s;
}
return 1;
}
/* FIXME: allow newline in filename by encoding it. */
static int
md5_file (const char *filename, int binary, unsigned char *md5_result)
{
FILE *fp;
int err;
if (strcmp (filename, "-") == 0)
{
have_read_stdin = 1;
fp = stdin;
}
else
{
/* OPENOPTS is a macro. It varies with the system.
Some systems distinguish between internal and
external text representations. */
fp = fopen (filename, OPENOPTS (binary));
if (fp == NULL)
{
error (0, errno, "%s", filename);
return 1;
}
}
err = md5_stream (fp, md5_result);
if (err)
{
error (0, errno, "%s", filename);
if (fp != stdin)
fclose (fp);
return 1;
}
if (fp != stdin && fclose (fp) == EOF)
{
error (0, errno, "%s", filename);
return 1;
}
return 0;
}
static int
md5_check (const char *checkfile_name, int binary)
{
FILE *checkfile_stream;
int n_properly_formated_lines = 0;
int n_mismatched_checksums = 0;
int n_open_or_read_failures = 0;
unsigned char md5buffer[16];
size_t line_number;
char *line;
size_t line_chars_allocated;
if (strcmp (checkfile_name, "-") == 0)
{
have_read_stdin = 1;
checkfile_name = _("standard input");
checkfile_stream = stdin;
}
else
{
checkfile_stream = fopen (checkfile_name, "r");
if (checkfile_stream == NULL)
{
error (0, errno, "%s", checkfile_name);
return 1;
}
}
line_number = 0;
line = NULL;
line_chars_allocated = 0;
do
{
char *filename;
int type_flag;
char *md5num;
int err;
int line_length;
++line_number;
line_length = getline (&line, &line_chars_allocated, checkfile_stream);
if (line_length <= 0)
break;
/* Ignore comment lines, which begin with a '#' character. */
if (line[0] == '#')
continue;
/* Remove any trailing newline. */
if (line[line_length - 1] == '\n')
line[--line_length] = '\0';
err = split_3 (line, line_length, &md5num, &type_flag, &filename);
if (err || !hex_digits (md5num))
{
if (warn)
{
error (0, 0,
_("%s: %lu: improperly formatted MD5 checksum line"),
checkfile_name, (unsigned long) line_number);
}
}
else
{
static const char bin2hex[] = { '0', '1', '2', '3',
'4', '5', '6', '7',
'8', '9', 'a', 'b',
'c', 'd', 'e', 'f' };
int fail;
++n_properly_formated_lines;
fail = md5_file (filename, binary, md5buffer);
if (fail)
{
++n_open_or_read_failures;
if (!status_only)
{
printf (_("%s: FAILED open or read\n"), filename);
fflush (stdout);
}
}
else
{
size_t cnt;
/* Compare generated binary number with text representation
in check file. Ignore case of hex digits. */
for (cnt = 0; cnt < 16; ++cnt)
{
if (TOLOWER (md5num[2 * cnt]) != bin2hex[md5buffer[cnt] >> 4]
|| (TOLOWER (md5num[2 * cnt + 1])
!= (bin2hex[md5buffer[cnt] & 0xf])))
break;
}
if (cnt != 16)
++n_mismatched_checksums;
if (!status_only)
{
printf ("%s: %s\n", filename,
(cnt != 16 ? _("FAILED") : _("OK")));
fflush (stdout);
}
}
}
}
while (!feof (checkfile_stream) && !ferror (checkfile_stream));
if (line)
free (line);
if (ferror (checkfile_stream))
{
error (0, 0, _("%s: read error"), checkfile_name);
return 1;
}
if (checkfile_stream != stdin && fclose (checkfile_stream) == EOF)
{
error (0, errno, "%s", checkfile_name);
return 1;
}
if (n_properly_formated_lines == 0)
{
/* Warn if no tests are found. */
error (0, 0, _("%s: no properly formatted MD5 checksum lines found"),
checkfile_name);
}
else
{
if (!status_only)
{
int n_computed_checkums = (n_properly_formated_lines
- n_open_or_read_failures);
if (n_open_or_read_failures > 0)
{
error (0, 0,
_("WARNING: %d of %d listed %s could not be read\n"),
n_open_or_read_failures, n_properly_formated_lines,
(n_properly_formated_lines == 1
? _("file") : _("files")));
}
if (n_mismatched_checksums > 0)
{
error (0, 0,
_("WARNING: %d of %d computed checksum%s did NOT match"),
n_mismatched_checksums, n_computed_checkums,
(n_computed_checkums == 1 ? "" : "s"));
}
}
}
return ((n_properly_formated_lines > 0 && n_mismatched_checksums == 0
&& n_open_or_read_failures == 0) ? 0 : 1);
}
int
main (int argc, char **argv)
{
unsigned char md5buffer[16];
int do_check = 0;
int do_version = 0;
int opt;
char **string = NULL;
size_t n_strings = 0;
size_t i;
size_t err = 0;
/* Text is default of the Plumb/Lankester format. */
int binary = 0;
/* Setting values of global variables. */
program_name = argv[0];
setlocale (LC_ALL, "");
bindtextdomain (PACKAGE, LOCALEDIR);
textdomain (PACKAGE);
parse_long_options (argc, argv, "md5sum", PACKAGE_VERSION, usage);
while ((opt = getopt_long (argc, argv, "bctw", long_options, NULL))
!= EOF)
switch (opt)
{
case 0: /* long option */
break;
case 1: /* --string */
{
if (string == NULL)
string = (char **) xmalloc ((argc - 1) * sizeof (char *));
if (optarg == NULL)
optarg = "";
string[n_strings++] = optarg;
}
break;
case 'b':
binary = 1;
break;
case 'c':
do_check = 1;
break;
case 2:
status_only = 1;
warn = 0;
break;
case 't':
binary = 0;
break;
case 'w':
status_only = 0;
warn = 1;
break;
default:
usage (EXIT_FAILURE);
}
if (do_version)
{
printf ("md5sum - %s\n", PACKAGE_VERSION);
exit (EXIT_SUCCESS);
}
if (n_strings > 0 && do_check)
{
error (0, 0,
_("the --string and --check options are mutually exclusive"));
usage (EXIT_FAILURE);
}
if (status_only && !do_check)
{
error (0, 0,
_("the --status option is meaningful only when verifying checksums"));
usage (EXIT_FAILURE);
}
if (warn && !do_check)
{
error (0, 0,
_("the --warn option is meaningful only when verifying checksums"));
usage (EXIT_FAILURE);
}
if (n_strings > 0)
{
if (optind < argc)
{
error (0, 0, _("no files may be specified when using --string"));
usage (EXIT_FAILURE);
}
for (i = 0; i < n_strings; ++i)
{
size_t cnt;
md5_buffer (string[i], strlen (string[i]), md5buffer);
for (cnt = 0; cnt < 16; ++cnt)
printf ("%02x", md5buffer[cnt]);
printf (" \"%s\"\n", string[i]);
}
}
else if (do_check)
{
if (optind + 1 < argc)
{
error (0, 0,
_("only one argument may be specified when using --check"));
usage (EXIT_FAILURE);
}
err = md5_check ((optind == argc) ? "-" : argv[optind], binary);
}
else
{
if (optind == argc)
argv[argc++] = "-";
for (; optind < argc; ++optind)
{
size_t i;
int fail;
char *file = argv[optind];
fail = md5_file (file, binary, md5buffer);
err |= fail;
if (!fail)
{
size_t filename_len;
for (i = 0; i < 16; ++i)
printf ("%02x", md5buffer[i]);
putchar (' ');
if (binary)
putchar ('*');
else
putchar (' ');
/* Translate each NEWLINE byte to the string,
NEWLINE_REPLACEMENT_STRING. But first record
the length of the filename, FILE. */
filename_len = strlen (file);
for (i = 0; i < filename_len; ++i)
{
if (file[i] == '\n')
fputs (NEWLINE_REPLACEMENT_STRING, stdout);
else
putchar (file[i]);
}
putchar ('\n');
}
}
}
if (fclose (stdout) == EOF)
error (EXIT_FAILURE, errno, _("write error"));
if (have_read_stdin && fclose (stdin) == EOF)
error (EXIT_FAILURE, errno, _("standard input"));
exit (err == 0 ? EXIT_SUCCESS : EXIT_FAILURE);
}
|