1 /* Compute MD5 checksum of files or strings according to the definition
2 of MD5 in RFC 1321 from April 1992.
3 Copyright (C) 95, 1996 Free Software Foundation, Inc.
5 This program is free software; you can redistribute it and/or modify
6 it under the terms of the GNU General Public License as published by
7 the Free Software Foundation; either version 2, or (at your option)
10 This program is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 GNU General Public License for more details.
15 You should have received a copy of the GNU General Public License
16 along with this program; if not, write to the Free Software Foundation,
17 Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
19 /* Written by Ulrich Drepper <drepper@gnu.ai.mit.edu>. */
27 #include <sys/types.h>
29 #include "long-options.h"
35 /* Most systems do not distinguish between external and internal
36 text representations. */
37 #if UNIX || __UNIX__ || unix || __unix__ || _POSIX_VERSION
38 # define OPENOPTS(BINARY) "r"
41 # define TEXT1TO1 "rb"
45 # define TEXT1TO1 "rb", "ctx=stm"
46 # define TEXTCNVT "r", "ctx=stm"
48 /* The following line is intended to evoke an error.
49 Using #error is not portable enough. */
50 "Cannot determine system type."
53 # define OPENOPTS(BINARY) ((BINARY) != 0 ? TEXT1TO1 : TEXTCNVT)
56 #if _LIBC || STDC_HEADERS
57 # define TOLOWER(c) tolower (c)
59 # define TOLOWER(c) (ISUPPER (c) ? tolower (c) : (c))
62 /* Nonzero if any of the files read were the standard input. */
63 static int have_read_stdin;
65 /* With --check, don't generate any output.
66 The exit code indicates success or failure. */
67 static int status_only = 0;
69 /* With --check, print a message to standard error warning about each
70 improperly formatted MD5 checksum line. */
73 /* The name this program was run with. */
76 static const struct option long_options[] =
78 { "binary", no_argument, 0, 'b' },
79 { "check", no_argument, 0, 'c' },
80 { "status", no_argument, 0, 2 },
81 { "string", required_argument, 0, 1 },
82 { "text", no_argument, 0, 't' },
83 { "warn", no_argument, 0, 'w' },
93 fprintf (stderr, _("Try `%s --help' for more information.\n"),
97 Usage: %s [OPTION] [FILE]...\n\
98 or: %s [OPTION] --check [FILE]\n\
99 or: %s [OPTION] --string=STRING ...\n\
100 Print or check MD5 checksums.\n\
101 With no FILE, or when FILE is -, read standard input.\n\
103 -b, --binary read files in binary mode\n\
104 -t, --text read files in text mode (default)\n\
105 -c, --check check MD5 sums against given list\n\
107 The following two options are useful only when verifying checksums:\n\
108 --status don't output anything, status code shows success\n\
109 -w, --warn warn about improperly formated MD5 checksum lines\n\
111 --string=STRING compute checksum for STRING\n\
112 --help display this help and exit\n\
113 --version output version information and exit\n\
115 The sums are computed as described in RFC 1321. When checking, the input\n\
116 should be a former output of this program. The default mode is to print\n\
117 a line with checksum, a character indicating type (`*' for binary, ` ' for\n\
118 text), and name for each FILE.\n"),
119 program_name, program_name, program_name);
121 exit (status == 0 ? EXIT_SUCCESS : EXIT_FAILURE);
124 /* FIXME: this format loses with filenames containing newline. */
127 split_3 (char *s, char **u, int *binary, char **w)
131 #define ISWHITE(c) ((c) == ' ' || (c) == '\t')
134 while (ISWHITE (s[i]))
137 /* The line has to be at least 35 characters long to contain correct
138 message digest information. */
139 if (strlen (&s[i]) >= 35)
143 /* The first field has to be the 32-character hexadecimal
144 representation of the message digest. If it not immediately
145 followed by a white space it's an error. */
152 if (s[i] != ' ' && s[i] != '*')
154 *binary = s[i++] == '*';
156 /* All characters between the type indicator and end of line are
157 significant -- that includes leading and trailing white space. */
160 /* So this line is valid as long as there is at least one character
162 return (**w ? 0 : 1);
168 hex_digits (const char *s)
179 /* FIXME: allow newline in filename by encoding it. */
182 md5_file (const char *filename, int binary, unsigned char *md5_result)
187 if (strcmp (filename, "-") == 0)
194 /* OPENOPTS is a macro. It varies with the system.
195 Some systems distinguish between internal and
196 external text representations. */
198 fp = fopen (filename, OPENOPTS (binary));
201 error (0, errno, "%s", filename);
206 err = md5_stream (fp, md5_result);
209 error (0, errno, "%s", filename);
215 if (fp != stdin && fclose (fp) == EOF)
217 error (0, errno, "%s", filename);
225 md5_check (const char *checkfile_name, int binary)
227 FILE *checkfile_stream;
228 int n_properly_formated_lines = 0;
229 int n_mismatched_checksums = 0;
230 int n_open_or_read_failures = 0;
231 unsigned char md5buffer[16];
234 size_t line_chars_allocated;
236 if (strcmp (checkfile_name, "-") == 0)
239 checkfile_name = _("standard input");
240 checkfile_stream = stdin;
244 checkfile_stream = fopen (checkfile_name, "r");
245 if (checkfile_stream == NULL)
247 error (0, errno, "%s", checkfile_name);
254 line_chars_allocated = 0;
265 line_length = getline (&line, &line_chars_allocated, checkfile_stream);
266 if (line_length <= 0)
269 /* Ignore comment lines, which begin with a '#' character. */
273 /* Remove any trailing newline. */
274 if (line[line_length - 1] == '\n')
275 line[--line_length] = '\0';
277 err = split_3 (line, &md5num, &type_flag, &filename);
278 if (err || !hex_digits (md5num))
283 _("%s: %lu: improperly formatted MD5 checksum line"),
284 checkfile_name, (unsigned long) line_number);
289 static const char bin2hex[] = { '0', '1', '2', '3',
292 'c', 'd', 'e', 'f' };
295 ++n_properly_formated_lines;
297 fail = md5_file (filename, binary, md5buffer);
301 ++n_open_or_read_failures;
304 printf (_("%s: FAILED open or read\n"), filename);
311 /* Compare generated binary number with text representation
312 in check file. Ignore case of hex digits. */
313 for (cnt = 0; cnt < 16; ++cnt)
315 if (TOLOWER (md5num[2 * cnt]) != bin2hex[md5buffer[cnt] >> 4]
316 || (TOLOWER (md5num[2 * cnt + 1])
317 != (bin2hex[md5buffer[cnt] & 0xf])))
321 ++n_mismatched_checksums;
325 printf ("%s: %s\n", filename,
326 (cnt != 16 ? _("FAILED") : _("OK")));
332 while (!feof (checkfile_stream) && !ferror (checkfile_stream));
337 if (ferror (checkfile_stream))
339 error (0, 0, _("%s: read error"), checkfile_name);
343 if (checkfile_stream != stdin && fclose (checkfile_stream) == EOF)
345 error (0, errno, "%s", checkfile_name);
349 if (n_properly_formated_lines == 0)
351 /* Warn if no tests are found. */
352 error (0, 0, _("%s: no properly formatted MD5 checksum lines found"),
359 int n_computed_checkums = (n_properly_formated_lines
360 - n_open_or_read_failures);
362 if (n_open_or_read_failures > 0)
365 _("WARNING: %d of %d listed file%s could not be read\n"),
366 n_open_or_read_failures, n_properly_formated_lines,
367 (n_properly_formated_lines == 1 ? "" : "s"));
370 if (n_mismatched_checksums > 0)
373 _("WARNING: %d of %d computed checksum%s did NOT match"),
374 n_mismatched_checksums, n_computed_checkums,
375 (n_computed_checkums == 1 ? "" : "s"));
380 return ((n_properly_formated_lines > 0 && n_mismatched_checksums == 0
381 && n_open_or_read_failures == 0) ? 0 : 1);
385 main (int argc, char **argv)
387 unsigned char md5buffer[16];
391 char **string = NULL;
392 size_t n_strings = 0;
396 /* Text is default of the Plumb/Lankester format. */
399 /* Setting values of global variables. */
400 program_name = argv[0];
401 setlocale (LC_ALL, "");
402 bindtextdomain (PACKAGE, LOCALEDIR);
403 textdomain (PACKAGE);
405 parse_long_options (argc, argv, "md5sum", PACKAGE_VERSION, usage);
407 while ((opt = getopt_long (argc, argv, "bctw", long_options, NULL))
411 case 0: /* long option */
413 case 1: /* --string */
416 string = (char **) xmalloc ((argc - 1) * sizeof (char *));
420 string[n_strings++] = optarg;
441 usage (EXIT_FAILURE);
446 printf ("md5sum - %s\n", PACKAGE_VERSION);
450 if (n_strings > 0 && do_check)
453 _("the --string and --check options are mutually exclusive"));
454 usage (EXIT_FAILURE);
457 if (status_only && !do_check)
460 _("the --status option is meaningful only when verifying checksums"));
461 usage (EXIT_FAILURE);
464 if (warn && !do_check)
467 _("the --warn option is meaningful only when verifying checksums"));
468 usage (EXIT_FAILURE);
475 error (0, 0, _("no files may be specified when using --string"));
476 usage (EXIT_FAILURE);
478 for (i = 0; i < n_strings; ++i)
481 md5_buffer (string[i], strlen (string[i]), md5buffer);
483 for (cnt = 0; cnt < 16; ++cnt)
484 printf ("%02x", md5buffer[cnt]);
486 printf (" \"%s\"\n", string[i]);
491 if (optind + 1 < argc)
494 _("only one argument may be specified when using --check"));
495 usage (EXIT_FAILURE);
498 err = md5_check ((optind == argc) ? "-" : argv[optind], binary);
505 for (; optind < argc; ++optind)
510 fail = md5_file (argv[optind], binary, md5buffer);
514 for (i = 0; i < 16; ++i)
515 printf ("%02x", md5buffer[i]);
517 printf (" %c%s\n", binary ? '*' : ' ', argv[optind]);
522 if (fclose (stdout) == EOF)
523 error (EXIT_FAILURE, errno, _("write error"));
525 if (have_read_stdin && fclose (stdin) == EOF)
526 error (EXIT_FAILURE, errno, _("standard input"));
528 exit (err == 0 ? EXIT_SUCCESS : EXIT_FAILURE);