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, 96, 1997 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 /* FIXME: This begs for an autoconf test. */
38 #if UNIX || __UNIX__ || unix || __unix__ || _POSIX_VERSION
39 # define OPENOPTS(BINARY) "r"
41 # define OPENOPTS(BINARY) ((BINARY) != 0 ? TEXT1TO1 : TEXTCNVT)
43 # define TEXT1TO1 "rb"
47 # define TEXT1TO1 "rb", "ctx=stm"
48 # define TEXTCNVT "r", "ctx=stm"
50 /* The following line is intended to evoke an error.
51 Using #error is not portable enough. */
52 "Cannot determine system type."
57 #if _LIBC || STDC_HEADERS
58 # define TOLOWER(c) tolower (c)
60 # define TOLOWER(c) (ISUPPER (c) ? tolower (c) : (c))
63 /* The minimum length of a valid digest line in a file produced
64 by `md5sum FILE' and read by `md5sum --check'. This length does
65 not include any newline character at the end of a line. */
66 #define MIN_DIGEST_LINE_LENGTH (32 /* message digest length */ \
67 + 2 /* blank and binary indicator */ \
68 + 1 /* minimum filename length */ )
70 /* Nonzero if any of the files read were the standard input. */
71 static int have_read_stdin;
73 /* With --check, don't generate any output.
74 The exit code indicates success or failure. */
75 static int status_only = 0;
77 /* With --check, print a message to standard error warning about each
78 improperly formatted MD5 checksum line. */
81 /* The name this program was run with. */
84 static const struct option long_options[] =
86 { "binary", no_argument, 0, 'b' },
87 { "check", no_argument, 0, 'c' },
88 { "status", no_argument, 0, 2 },
89 { "string", required_argument, 0, 1 },
90 { "text", no_argument, 0, 't' },
91 { "warn", no_argument, 0, 'w' },
101 fprintf (stderr, _("Try `%s --help' for more information.\n"),
106 Usage: %s [OPTION] [FILE]...\n\
107 or: %s [OPTION] --check [FILE]\n\
108 Print or check MD5 checksums.\n\
109 With no FILE, or when FILE is -, read standard input.\n\
111 -b, --binary read files in binary mode\n\
112 -c, --check check MD5 sums against given list\n\
113 -t, --text read files in text mode (default)\n\
115 The following two options are useful only when verifying checksums:\n\
116 --status don't output anything, status code shows success\n\
117 -w, --warn warn about improperly formated MD5 checksum lines\n\
119 --help display this help and exit\n\
120 --version output version information and exit\n\
122 The sums are computed as described in RFC 1321. When checking, the input\n\
123 should be a former output of this program. The default mode is to print\n\
124 a line with checksum, a character indicating type (`*' for binary, ` ' for\n\
125 text), and name for each FILE.\n"),
126 program_name, program_name, program_name);
127 puts (_("\nReport bugs to <textutils-bugs@gnu.org>."));
130 exit (status == 0 ? EXIT_SUCCESS : EXIT_FAILURE);
134 split_3 (char *s, size_t s_len, char **u, int *binary, char **w)
137 int filename_has_newline = 0;
139 #define ISWHITE(c) ((c) == ' ' || (c) == '\t')
142 while (ISWHITE (s[i]))
145 /* The line must have at least 35 (36 if the first is a backslash)
146 more characters to contain correct message digest information.
147 Ignore this line if it is too short. */
148 if (!(s_len - i >= MIN_DIGEST_LINE_LENGTH
149 || (s[i] == '\\' && s_len - i >= 1 + MIN_DIGEST_LINE_LENGTH)))
155 filename_has_newline = 1;
159 /* The first field has to be the 32-character hexadecimal
160 representation of the message digest. If it is not followed
161 immediately by a white space it's an error. */
168 if (s[i] != ' ' && s[i] != '*')
170 *binary = (s[i++] == '*');
172 /* All characters between the type indicator and end of line are
173 significant -- that includes leading and trailing white space. */
176 if (filename_has_newline)
178 /* Translate each `\n' string in the file name to a NEWLINE,
179 and each `\\' string to a backslash. */
190 /* A valid line does not end with a backslash. */
203 /* Only `\' or `n' may follow a backslash. */
209 /* The file name may not contain a NUL. */
224 hex_digits (const char *s)
235 /* An interface to md5_stream. Operate on FILENAME (it may be "-") and
236 put the result in *MD5_RESULT. Return non-zero upon failure, zero
237 to indicate success. */
240 md5_file (const char *filename, int binary, unsigned char *md5_result)
245 if (strcmp (filename, "-") == 0)
252 /* OPENOPTS is a macro. It varies with the system.
253 Some systems distinguish between internal and
254 external text representations. */
256 fp = fopen (filename, OPENOPTS (binary));
259 error (0, errno, "%s", filename);
264 err = md5_stream (fp, md5_result);
267 error (0, errno, "%s", filename);
273 if (fp != stdin && fclose (fp) == EOF)
275 error (0, errno, "%s", filename);
283 md5_check (const char *checkfile_name)
285 FILE *checkfile_stream;
286 int n_properly_formated_lines = 0;
287 int n_mismatched_checksums = 0;
288 int n_open_or_read_failures = 0;
289 unsigned char md5buffer[16];
292 size_t line_chars_allocated;
294 if (strcmp (checkfile_name, "-") == 0)
297 checkfile_name = _("standard input");
298 checkfile_stream = stdin;
302 checkfile_stream = fopen (checkfile_name, "r");
303 if (checkfile_stream == NULL)
305 error (0, errno, "%s", checkfile_name);
312 line_chars_allocated = 0;
323 line_length = getline (&line, &line_chars_allocated, checkfile_stream);
324 if (line_length <= 0)
327 /* Ignore comment lines, which begin with a '#' character. */
331 /* Remove any trailing newline. */
332 if (line[line_length - 1] == '\n')
333 line[--line_length] = '\0';
335 err = split_3 (line, line_length, &md5num, &binary, &filename);
336 if (err || !hex_digits (md5num))
341 _("%s: %lu: improperly formatted MD5 checksum line"),
342 checkfile_name, (unsigned long) line_number);
347 static const char bin2hex[] = { '0', '1', '2', '3',
350 'c', 'd', 'e', 'f' };
353 ++n_properly_formated_lines;
355 fail = md5_file (filename, binary, md5buffer);
359 ++n_open_or_read_failures;
362 printf (_("%s: FAILED open or read\n"), filename);
369 /* Compare generated binary number with text representation
370 in check file. Ignore case of hex digits. */
371 for (cnt = 0; cnt < 16; ++cnt)
373 if (TOLOWER (md5num[2 * cnt]) != bin2hex[md5buffer[cnt] >> 4]
374 || (TOLOWER (md5num[2 * cnt + 1])
375 != (bin2hex[md5buffer[cnt] & 0xf])))
379 ++n_mismatched_checksums;
383 printf ("%s: %s\n", filename,
384 (cnt != 16 ? _("FAILED") : _("OK")));
390 while (!feof (checkfile_stream) && !ferror (checkfile_stream));
395 if (ferror (checkfile_stream))
397 error (0, 0, _("%s: read error"), checkfile_name);
401 if (checkfile_stream != stdin && fclose (checkfile_stream) == EOF)
403 error (0, errno, "%s", checkfile_name);
407 if (n_properly_formated_lines == 0)
409 /* Warn if no tests are found. */
410 error (0, 0, _("%s: no properly formatted MD5 checksum lines found"),
417 int n_computed_checkums = (n_properly_formated_lines
418 - n_open_or_read_failures);
420 if (n_open_or_read_failures > 0)
423 _("WARNING: %d of %d listed %s could not be read\n"),
424 n_open_or_read_failures, n_properly_formated_lines,
425 (n_properly_formated_lines == 1
426 ? _("file") : _("files")));
429 if (n_mismatched_checksums > 0)
432 _("WARNING: %d of %d computed %s did NOT match"),
433 n_mismatched_checksums, n_computed_checkums,
434 (n_computed_checkums == 1
435 ? _("checksum") : _("checksums")));
440 return ((n_properly_formated_lines > 0 && n_mismatched_checksums == 0
441 && n_open_or_read_failures == 0) ? 0 : 1);
445 main (int argc, char **argv)
447 unsigned char md5buffer[16];
450 char **string = NULL;
451 size_t n_strings = 0;
453 int file_type_specified = 0;
455 /* Text is default of the Plumb/Lankester format. */
458 /* Setting values of global variables. */
459 program_name = argv[0];
460 setlocale (LC_ALL, "");
461 bindtextdomain (PACKAGE, LOCALEDIR);
462 textdomain (PACKAGE);
464 parse_long_options (argc, argv, "md5sum", GNU_PACKAGE, VERSION, usage);
466 while ((opt = getopt_long (argc, argv, "bctw", long_options, NULL)) != -1)
469 case 0: /* long option */
471 case 1: /* --string */
474 string = (char **) xmalloc ((argc - 1) * sizeof (char *));
478 string[n_strings++] = optarg;
482 file_type_specified = 1;
493 file_type_specified = 1;
501 usage (EXIT_FAILURE);
504 if (file_type_specified && do_check)
506 error (0, 0, _("the --binary and --text options are meaningless when \
507 verifying checksums"));
508 usage (EXIT_FAILURE);
511 if (n_strings > 0 && do_check)
514 _("the --string and --check options are mutually exclusive"));
515 usage (EXIT_FAILURE);
518 if (status_only && !do_check)
521 _("the --status option is meaningful only when verifying checksums"));
522 usage (EXIT_FAILURE);
525 if (warn && !do_check)
528 _("the --warn option is meaningful only when verifying checksums"));
529 usage (EXIT_FAILURE);
538 error (0, 0, _("no files may be specified when using --string"));
539 usage (EXIT_FAILURE);
541 for (i = 0; i < n_strings; ++i)
544 md5_buffer (string[i], strlen (string[i]), md5buffer);
546 for (cnt = 0; cnt < 16; ++cnt)
547 printf ("%02x", md5buffer[cnt]);
549 printf (" \"%s\"\n", string[i]);
554 if (optind + 1 < argc)
557 _("only one argument may be specified when using --check"));
558 usage (EXIT_FAILURE);
561 err = md5_check ((optind == argc) ? "-" : argv[optind]);
568 for (; optind < argc; ++optind)
571 char *file = argv[optind];
573 fail = md5_file (file, binary, md5buffer);
579 /* Output a leading backslash if the file name contains
581 if (strchr (file, '\n'))
584 for (i = 0; i < 16; ++i)
585 printf ("%02x", md5buffer[i]);
593 /* Translate each NEWLINE byte to the string, "\\n",
594 and each backslash to "\\\\". */
595 for (i = 0; i < strlen (file); ++i)
600 fputs ("\\n", stdout);
604 fputs ("\\\\", stdout);
617 if (fclose (stdout) == EOF)
618 error (EXIT_FAILURE, errno, _("write error"));
620 if (have_read_stdin && fclose (stdin) == EOF)
621 error (EXIT_FAILURE, errno, _("standard input"));
623 exit (err == 0 ? EXIT_SUCCESS : EXIT_FAILURE);