summaryrefslogtreecommitdiff
path: root/src/md5sum.c
blob: da4a7caf5df650d139b4c8305aa8852b2b8ec572 (plain)
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
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
/* Compute MD5 or SHA1 checksum of files or strings
   Copyright (C) 1995-2004 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>.  */

#include <config.h>

#include <getopt.h>
#include <stdio.h>
#include <sys/types.h>

#include "system.h"

#include "md5.h"
#include "sha1.h"
#include "checksum.h"
#include "getline.h"
#include "error.h"
#include "quote.h"

/* The official name of this program (e.g., no `g' prefix).  */
#define PROGRAM_NAME (algorithm == ALG_MD5 ? "md5sum" : "sha1sum")

#define AUTHORS "Ulrich Drepper", "Scott Miller"

/* Most systems do not distinguish between external and internal
   text representations.  */
/* FIXME: This begs for an autoconf test.  */
#if O_BINARY
# define OPENOPTS(BINARY) ((BINARY) != 0 ? TEXT1TO1 : TEXTCNVT)
# define TEXT1TO1 "rb"
# define TEXTCNVT "r"
#else
# if defined VMS
#  define OPENOPTS(BINARY) ((BINARY) != 0 ? TEXT1TO1 : TEXTCNVT)
#  define TEXT1TO1 "rb", "ctx=stm"
#  define TEXTCNVT "r", "ctx=stm"
# else
#  if UNIX || __UNIX__ || unix || __unix__ || _POSIX_VERSION
#   define OPENOPTS(BINARY) "r"
#  else
    /* The following line is intended to evoke an error.
       Using #error is not portable enough.  */
    "Cannot determine system type."
#  endif
# endif
#endif


#define DIGEST_TYPE_STRING(Alg) ((Alg) == ALG_MD5 ? "MD5" : "SHA1")
#define DIGEST_STREAM(Alg) ((Alg) == ALG_MD5 ? md5_stream : sha_stream)

#define DIGEST_BITS(Alg) ((Alg) == ALG_MD5 ? 128 : 160)
#define DIGEST_HEX_BYTES(Alg) (DIGEST_BITS (Alg) / 4)
#define DIGEST_BIN_BYTES(Alg) (DIGEST_BITS (Alg) / 8)

#define MAX_DIGEST_BIN_BYTES MAX (DIGEST_BIN_BYTES (ALG_MD5), \
				  DIGEST_BIN_BYTES (ALG_SHA1))

/* The minimum length of a valid digest line.  This length does
   not include any newline character at the end of a line.  */
#define MIN_DIGEST_LINE_LENGTH(Alg) \
  (DIGEST_HEX_BYTES (Alg) /* length of hexadecimal message digest */ \
   + 2 /* blank and binary indicator */ \
   + 1 /* minimum filename length */ )

/* Nonzero if any of the files read were the standard input. */
static int have_read_stdin;

/* The minimum length of a valid checksum line for the selected algorithm.  */
static size_t min_digest_line_length;

/* Set to the length of a digest hex string for the selected algorithm.  */
static size_t digest_hex_bytes;

/* 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 checksum line.  */
static int warn = 0;

/* Declared and set via one of the wrapper .c files.  */
/* int algorithm = ALG_UNSPECIFIED; */

/* 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' },
  { GETOPT_HELP_OPTION_DECL },
  { GETOPT_VERSION_OPTION_DECL },
  { NULL, 0, NULL, 0 }
};

void
usage (int status)
{
  if (status != EXIT_SUCCESS)
    fprintf (stderr, _("Try `%s --help' for more information.\n"),
	     program_name);
  else
    {
      printf (_("\
Usage: %s [OPTION] [FILE]...\n\
  or:  %s [OPTION] --check [FILE]\n\
Print or check %s (%d-bit) checksums.\n\
With no FILE, or when FILE is -, read standard input.\n\
"),
	      program_name, program_name,
	      DIGEST_TYPE_STRING (algorithm),
	      DIGEST_BITS (algorithm));
      printf (_("\
\n\
  -b, --binary            read files in binary mode (default on DOS/Windows)\n\
  -c, --check             check %s sums against given list\n\
  -t, --text              read files in text mode (default)\n\
\n\
"),
	      DIGEST_TYPE_STRING (algorithm));
      fputs (_("\
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 checksum lines\n\
\n\
"), stdout);
      fputs (HELP_OPTION_DESCRIPTION, stdout);
      fputs (VERSION_OPTION_DESCRIPTION, stdout);
      printf (_("\
\n\
The sums are computed as described in %s.  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"),
	      (algorithm == ALG_MD5 ? "RFC 1321" : "FIPS-180-1"));
      printf (_("\nReport bugs to <%s>.\n"), PACKAGE_BUGREPORT);
    }

  exit (status);
}

#define ISWHITE(c) ((c) == ' ' || (c) == '\t')

/* Split the checksum string S (of length S_LEN) from a BSD 'md5' or
   'sha1' command into two parts: a hexadecimal digest, and the file
   name.  S is modified.  */

static int
bsd_split_3 (char *s, size_t s_len, unsigned char **hex_digest, char **file_name)
{
  size_t i;

  *file_name = s;

  /* Find end of filename. The BSD 'md5' and 'sha1' commands do not escape
     filenames, so search backwards for the last ')'. */
  i = s_len - 1;
  while (i && s[i] != ')')
    i--;

  if (s[i] != ')')
    return 1;

  s[i++] = '\0';

  while (ISWHITE (s[i]))
    i++;

  if (s[i] != '=')
    return 1;

  i++;

  while (ISWHITE (s[i]))
    i++;

  *hex_digest = (unsigned char *) &s[i];
  return 0;
}

/* Split the string S (of length S_LEN) into three parts:
   a hexadecimal digest, binary flag, and the file name.
   S is modified.  */

static int
split_3 (char *s, size_t s_len,
	 unsigned char **hex_digest, int *binary, char **file_name)
{
  size_t i;
  int escaped_filename = 0;
  size_t algo_name_len;

  i = 0;
  while (ISWHITE (s[i]))
    ++i;

  /* Check for BSD-style checksum line. */
  algo_name_len = strlen (DIGEST_TYPE_STRING (algorithm));
  if (strncmp (s + i, DIGEST_TYPE_STRING (algorithm), algo_name_len) == 0)
    {
      if (strncmp (s + i + algo_name_len, " (", 2) == 0)
	{
	  *binary = 0;
	  return bsd_split_3 (s +      i + algo_name_len + 2,
			      s_len - (i + algo_name_len + 2),
			      hex_digest, file_name);
	}
    }

  /* Ignore this line if it is too short.
     Each line must have at least `min_digest_line_length - 1' (or one more, if
     the first is a backslash) more characters to contain correct message digest
     information.  */
  if (s_len - i < min_digest_line_length + (s[i] == '\\'))
    return 1;

  if (s[i] == '\\')
    {
      ++i;
      escaped_filename = 1;
    }
  *hex_digest = (unsigned char *) &s[i];

  /* The first field has to be the n-character hexadecimal
     representation of the message digest.  If it is not followed
     immediately by a white space it's an error.  */
  i += digest_hex_bytes;
  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.  */
  *file_name = &s[i];

  if (escaped_filename)
    {
      /* Translate each `\n' string in the file name to a NEWLINE,
	 and each `\\' string to a backslash.  */

      char *dst = &s[i];

      while (i < s_len)
	{
	  switch (s[i])
	    {
	    case '\\':
	      if (i == s_len - 1)
		{
		  /* A valid line does not end with a backslash.  */
		  return 1;
		}
	      ++i;
	      switch (s[i++])
		{
		case 'n':
		  *dst++ = '\n';
		  break;
		case '\\':
		  *dst++ = '\\';
		  break;
		default:
		  /* Only `\' or `n' may follow a backslash.  */
		  return 1;
		}
	      break;

	    case '\0':
	      /* The file name may not contain a NUL.  */
	      return 1;
	      break;

	    default:
	      *dst++ = s[i++];
	      break;
	    }
	}
      *dst = '\0';
    }
  return 0;
}

static int
hex_digits (unsigned char const *s)
{
  while (*s)
    {
      if (!ISXDIGIT (*s))
        return 0;
      ++s;
    }
  return 1;
}

/* An interface to the function, DIGEST_STREAM,
   (either md5_stream or sha_stream).
   Operate on FILENAME (it may be "-") and put the result in *BIN_RESULT.
   Return non-zero upon failure, zero to indicate success.  */

static int
digest_file (const char *filename, int binary, unsigned char *bin_result,
	   int (*digest_stream)(FILE *, void *))
{
  FILE *fp;
  int err;

  if (STREQ (filename, "-"))
    {
      have_read_stdin = 1;
      fp = stdin;
#if O_BINARY
      /* If we need binary reads from a pipe or redirected stdin, we need
	 to switch it to BINARY mode here, since stdin is already open.  */
      if (binary)
	SET_BINARY (fileno (stdin));
#endif
    }
  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 = (*digest_stream) (fp, bin_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
digest_check (const char *checkfile_name, int (*digest_stream)(FILE *, void *))
{
  FILE *checkfile_stream;
  int n_properly_formated_lines = 0;
  int n_mismatched_checksums = 0;
  int n_open_or_read_failures = 0;
  unsigned char bin_buffer[MAX_DIGEST_BIN_BYTES];
  size_t line_number;
  char *line;
  size_t line_chars_allocated;

  if (STREQ (checkfile_name, "-"))
    {
      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;
	}
    }

  SET_MODE (fileno (checkfile_stream), O_TEXT);
  line_number = 0;
  line = NULL;
  line_chars_allocated = 0;
  do
    {
      char *filename;
      int binary;
      unsigned char *hex_digest;
      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, &hex_digest, &binary, &filename);
      if (err || !hex_digits (hex_digest))
	{
	  if (warn)
	    {
	      error (0, 0,
		     _("%s: %lu: improperly formatted %s checksum line"),
		     checkfile_name, (unsigned long) line_number,
		     DIGEST_TYPE_STRING (algorithm));
	    }
	}
      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 = digest_file (filename, binary, bin_buffer, digest_stream);

	  if (fail)
	    {
	      ++n_open_or_read_failures;
	      if (!status_only)
		{
		  printf (_("%s: FAILED open or read\n"), filename);
		  fflush (stdout);
		}
	    }
	  else
	    {
	      size_t digest_bin_bytes = digest_hex_bytes / 2;
	      size_t cnt;
	      /* Compare generated binary number with text representation
		 in check file.  Ignore case of hex digits.  */
	      for (cnt = 0; cnt < digest_bin_bytes; ++cnt)
		{
		  if (TOLOWER (hex_digest[2 * cnt])
		      != bin2hex[bin_buffer[cnt] >> 4]
		      || (TOLOWER (hex_digest[2 * cnt + 1])
			  != (bin2hex[bin_buffer[cnt] & 0xf])))
		    break;
		}
	      if (cnt != digest_bin_bytes)
		++n_mismatched_checksums;

	      if (!status_only)
		{
		  printf ("%s: %s\n", filename,
			  (cnt != digest_bin_bytes ? _("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 %s checksum lines found"),
	     checkfile_name, DIGEST_TYPE_STRING (algorithm));
    }
  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_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 %s did NOT match"),
		     n_mismatched_checksums, n_computed_checkums,
		     (n_computed_checkums == 1
		      ? _("checksum") : _("checksums")));
	    }
	}
    }

  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 bin_buffer[MAX_DIGEST_BIN_BYTES];
  int do_check = 0;
  int opt;
  char **string = NULL;
  size_t n_strings = 0;
  int err = 0;
  int file_type_specified = 0;

#if O_BINARY
  /* Binary is default on MSDOS, so the actual file contents
     are used in computation.  */
  int binary = 1;
#else
  /* Text is default of the Plumb/Lankester format.  */
  int binary = 0;
#endif

  /* Setting values of global variables.  */
  initialize_main (&argc, &argv);
  program_name = argv[0];
  setlocale (LC_ALL, "");
  bindtextdomain (PACKAGE, LOCALEDIR);
  textdomain (PACKAGE);

  atexit (close_stdout);

  while ((opt = getopt_long (argc, argv, "bctw", long_options, NULL)) != -1)
    switch (opt)
      {
      case 0:			/* long option */
	break;
      case 1: /* --string */
	{
	  if (string == NULL)
	    string = xnmalloc (argc - 1, sizeof *string);

	  if (optarg == NULL)
	    optarg = "";
	  string[n_strings++] = optarg;
	}
	break;
      case 'b':
	file_type_specified = 1;
	binary = 1;
	break;
      case 'c':
	do_check = 1;
	break;
      case 2:
	status_only = 1;
	warn = 0;
	break;
      case 't':
	file_type_specified = 1;
	binary = 0;
	break;
      case 'w':
	status_only = 0;
	warn = 1;
	break;
      case_GETOPT_HELP_CHAR;
      case_GETOPT_VERSION_CHAR (PROGRAM_NAME, AUTHORS);
      default:
	usage (EXIT_FAILURE);
      }

  min_digest_line_length = MIN_DIGEST_LINE_LENGTH (algorithm);
  digest_hex_bytes = DIGEST_HEX_BYTES (algorithm);

  if (file_type_specified && do_check)
    {
      error (0, 0, _("the --binary and --text options are meaningless when \
verifying checksums"));
      usage (EXIT_FAILURE);
    }

  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)
    {
      size_t i;

      if (optind < argc)
	{
	  error (0, 0, _("extra operand %s"), quote (argv[optind]));
	  fprintf (stderr, "%s\n",
		   _("File operands cannot be combined with --string."));
	  usage (EXIT_FAILURE);
	}
      for (i = 0; i < n_strings; ++i)
	{
	  size_t cnt;
	  if (algorithm == ALG_MD5)
	    md5_buffer (string[i], strlen (string[i]), bin_buffer);
	  else
	    sha_buffer (string[i], strlen (string[i]), bin_buffer);

	  for (cnt = 0; cnt < (digest_hex_bytes / 2); ++cnt)
	    printf ("%02x", bin_buffer[cnt]);

	  printf ("  \"%s\"\n", string[i]);
	}
    }
  else if (do_check)
    {
      if (optind + 1 < argc)
	{
	  error (0, 0, _("extra operand %s"), quote (argv[optind + 1]));
	  fprintf (stderr, "%s\n",
		   _("Only one operand may be specified when using --check."));
	  usage (EXIT_FAILURE);
	}

      err = digest_check ((optind == argc) ? "-" : argv[optind],
			  DIGEST_STREAM (algorithm));
    }
  else
    {
      if (optind == argc)
	argv[argc++] = "-";

      for (; optind < argc; ++optind)
	{
	  int fail;
	  char *file = argv[optind];

	  fail = digest_file (file, binary, bin_buffer,
			      DIGEST_STREAM (algorithm));
	  err |= fail;
	  if (!fail)
	    {
	      size_t i;

	      /* Output a leading backslash if the file name contains
		 a newline or backslash.  */
	      if (strchr (file, '\n') || strchr (file, '\\'))
		putchar ('\\');

	      for (i = 0; i < (digest_hex_bytes / 2); ++i)
		printf ("%02x", bin_buffer[i]);

	      putchar (' ');
	      if (binary)
		putchar ('*');
	      else
		putchar (' ');

	      /* Translate each NEWLINE byte to the string, "\\n",
		 and each backslash to "\\\\".  */
	      for (i = 0; i < strlen (file); ++i)
		{
		  switch (file[i])
		    {
		    case '\n':
		      fputs ("\\n", stdout);
		      break;

		    case '\\':
		      fputs ("\\\\", stdout);
		      break;

		    default:
		      putchar (file[i]);
		      break;
		    }
		}
	      putchar ('\n');
	    }
	}
    }

  if (have_read_stdin && fclose (stdin) == EOF)
    error (EXIT_FAILURE, errno, _("standard input"));

  exit (err == 0 ? EXIT_SUCCESS : EXIT_FAILURE);
}