1 /* Compute MD5 checksum of files or strings according to the definition
2 of MD5 in RFC 1321 from April 1992.
3 Copyright (C) 1995-1999 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>
34 /* The official name of this program (e.g., no `g' prefix). */
35 #define PROGRAM_NAME "md5sum"
37 #define AUTHORS "Ulrich Drepper"
39 /* Most systems do not distinguish between external and internal
40 text representations. */
41 /* FIXME: This begs for an autoconf test. */
43 # define OPENOPTS(BINARY) ((BINARY) != 0 ? TEXT1TO1 : TEXTCNVT)
44 # define TEXT1TO1 "rb"
48 # define OPENOPTS(BINARY) ((BINARY) != 0 ? TEXT1TO1 : TEXTCNVT)
49 # define TEXT1TO1 "rb", "ctx=stm"
50 # define TEXTCNVT "r", "ctx=stm"
52 # if UNIX || __UNIX__ || unix || __unix__ || _POSIX_VERSION
53 # define OPENOPTS(BINARY) "r"
55 /* The following line is intended to evoke an error.
56 Using #error is not portable enough. */
57 "Cannot determine system type."
62 #if _LIBC || STDC_HEADERS
63 # define TOLOWER(c) tolower (c)
65 # define TOLOWER(c) (ISUPPER (c) ? tolower (c) : (c))
68 /* The minimum length of a valid digest line in a file produced
69 by `md5sum FILE' and read by `md5sum --check'. This length does
70 not include any newline character at the end of a line. */
71 #define MIN_DIGEST_LINE_LENGTH (32 /* message digest length */ \
72 + 2 /* blank and binary indicator */ \
73 + 1 /* minimum filename length */ )
75 /* Nonzero if any of the files read were the standard input. */
76 static int have_read_stdin;
78 /* With --check, don't generate any output.
79 The exit code indicates success or failure. */
80 static int status_only = 0;
82 /* With --check, print a message to standard error warning about each
83 improperly formatted MD5 checksum line. */
86 /* The name this program was run with. */
89 static const struct option long_options[] =
91 { "binary", no_argument, 0, 'b' },
92 { "check", no_argument, 0, 'c' },
93 { "status", no_argument, 0, 2 },
94 { "string", required_argument, 0, 1 },
95 { "text", no_argument, 0, 't' },
96 { "warn", no_argument, 0, 'w' },
97 { GETOPT_HELP_OPTION_DECL },
98 { GETOPT_VERSION_OPTION_DECL },
106 fprintf (stderr, _("Try `%s --help' for more information.\n"),
111 Usage: %s [OPTION] [FILE]...\n\
112 or: %s [OPTION] --check [FILE]\n\
113 Print or check MD5 checksums.\n\
114 With no FILE, or when FILE is -, read standard input.\n\
116 -b, --binary read files in binary mode (default on DOS/Windows)\n\
117 -c, --check check MD5 sums against given list\n\
118 -t, --text read files in text mode (default)\n\
120 The following two options are useful only when verifying checksums:\n\
121 --status don't output anything, status code shows success\n\
122 -w, --warn warn about improperly formated MD5 checksum lines\n\
124 --help display this help and exit\n\
125 --version output version information and exit\n\
127 The sums are computed as described in RFC 1321. When checking, the input\n\
128 should be a former output of this program. The default mode is to print\n\
129 a line with checksum, a character indicating type (`*' for binary, ` ' for\n\
130 text), and name for each FILE.\n"),
131 program_name, program_name);
132 puts (_("\nReport bugs to <bug-textutils@gnu.org>."));
135 exit (status == 0 ? EXIT_SUCCESS : EXIT_FAILURE);
139 split_3 (char *s, size_t s_len, unsigned char **u, int *binary, char **w)
142 int escaped_filename = 0;
144 #define ISWHITE(c) ((c) == ' ' || (c) == '\t')
147 while (ISWHITE (s[i]))
150 /* The line must have at least 35 (36 if the first is a backslash)
151 more characters to contain correct message digest information.
152 Ignore this line if it is too short. */
153 if (!(s_len - i >= MIN_DIGEST_LINE_LENGTH
154 || (s[i] == '\\' && s_len - i >= 1 + MIN_DIGEST_LINE_LENGTH)))
160 escaped_filename = 1;
162 *u = (unsigned char *) &s[i];
164 /* The first field has to be the 32-character hexadecimal
165 representation of the message digest. If it is not followed
166 immediately by a white space it's an error. */
173 if (s[i] != ' ' && s[i] != '*')
175 *binary = (s[i++] == '*');
177 /* All characters between the type indicator and end of line are
178 significant -- that includes leading and trailing white space. */
181 if (escaped_filename)
183 /* Translate each `\n' string in the file name to a NEWLINE,
184 and each `\\' string to a backslash. */
195 /* A valid line does not end with a backslash. */
208 /* Only `\' or `n' may follow a backslash. */
214 /* The file name may not contain a NUL. */
229 hex_digits (unsigned char const *s)
240 /* An interface to md5_stream. Operate on FILENAME (it may be "-") and
241 put the result in *MD5_RESULT. Return non-zero upon failure, zero
242 to indicate success. */
245 md5_file (const char *filename, int binary, unsigned char *md5_result)
250 if (STREQ (filename, "-"))
255 /* If we need binary reads from a pipe or redirected stdin, we need
256 to switch it to BINARY mode here, since stdin is already open. */
258 SET_BINARY (fileno (stdin));
263 /* OPENOPTS is a macro. It varies with the system.
264 Some systems distinguish between internal and
265 external text representations. */
267 fp = fopen (filename, OPENOPTS (binary));
270 error (0, errno, "%s", filename);
275 err = md5_stream (fp, md5_result);
278 error (0, errno, "%s", filename);
284 if (fp != stdin && fclose (fp) == EOF)
286 error (0, errno, "%s", filename);
294 md5_check (const char *checkfile_name)
296 FILE *checkfile_stream;
297 int n_properly_formated_lines = 0;
298 int n_mismatched_checksums = 0;
299 int n_open_or_read_failures = 0;
300 unsigned char md5buffer[16];
303 size_t line_chars_allocated;
305 if (STREQ (checkfile_name, "-"))
308 checkfile_name = _("standard input");
309 checkfile_stream = stdin;
313 checkfile_stream = fopen (checkfile_name, "r");
314 if (checkfile_stream == NULL)
316 error (0, errno, "%s", checkfile_name);
323 line_chars_allocated = 0;
328 unsigned char *md5num;
334 line_length = getline (&line, &line_chars_allocated, checkfile_stream);
335 if (line_length <= 0)
338 /* Ignore comment lines, which begin with a '#' character. */
342 /* Remove any trailing newline. */
343 if (line[line_length - 1] == '\n')
344 line[--line_length] = '\0';
346 err = split_3 (line, line_length, &md5num, &binary, &filename);
347 if (err || !hex_digits (md5num))
352 _("%s: %lu: improperly formatted MD5 checksum line"),
353 checkfile_name, (unsigned long) line_number);
358 static const char bin2hex[] = { '0', '1', '2', '3',
361 'c', 'd', 'e', 'f' };
364 ++n_properly_formated_lines;
366 fail = md5_file (filename, binary, md5buffer);
370 ++n_open_or_read_failures;
373 printf (_("%s: FAILED open or read\n"), filename);
380 /* Compare generated binary number with text representation
381 in check file. Ignore case of hex digits. */
382 for (cnt = 0; cnt < 16; ++cnt)
384 if (TOLOWER (md5num[2 * cnt]) != bin2hex[md5buffer[cnt] >> 4]
385 || (TOLOWER (md5num[2 * cnt + 1])
386 != (bin2hex[md5buffer[cnt] & 0xf])))
390 ++n_mismatched_checksums;
394 printf ("%s: %s\n", filename,
395 (cnt != 16 ? _("FAILED") : _("OK")));
401 while (!feof (checkfile_stream) && !ferror (checkfile_stream));
406 if (ferror (checkfile_stream))
408 error (0, 0, _("%s: read error"), checkfile_name);
412 if (checkfile_stream != stdin && fclose (checkfile_stream) == EOF)
414 error (0, errno, "%s", checkfile_name);
418 if (n_properly_formated_lines == 0)
420 /* Warn if no tests are found. */
421 error (0, 0, _("%s: no properly formatted MD5 checksum lines found"),
428 int n_computed_checkums = (n_properly_formated_lines
429 - n_open_or_read_failures);
431 if (n_open_or_read_failures > 0)
434 _("WARNING: %d of %d listed %s could not be read\n"),
435 n_open_or_read_failures, n_properly_formated_lines,
436 (n_properly_formated_lines == 1
437 ? _("file") : _("files")));
440 if (n_mismatched_checksums > 0)
443 _("WARNING: %d of %d computed %s did NOT match"),
444 n_mismatched_checksums, n_computed_checkums,
445 (n_computed_checkums == 1
446 ? _("checksum") : _("checksums")));
451 return ((n_properly_formated_lines > 0 && n_mismatched_checksums == 0
452 && n_open_or_read_failures == 0) ? 0 : 1);
456 main (int argc, char **argv)
458 unsigned char md5buffer[16];
461 char **string = NULL;
462 size_t n_strings = 0;
464 int file_type_specified = 0;
467 /* Binary is default on MSDOS, so the actual file contents
468 are used in computation. */
471 /* Text is default of the Plumb/Lankester format. */
475 /* Setting values of global variables. */
476 program_name = argv[0];
477 setlocale (LC_ALL, "");
478 bindtextdomain (PACKAGE, LOCALEDIR);
479 textdomain (PACKAGE);
481 while ((opt = getopt_long (argc, argv, "bctw", long_options, NULL)) != -1)
484 case 0: /* long option */
486 case 1: /* --string */
489 string = (char **) xmalloc ((argc - 1) * sizeof (char *));
493 string[n_strings++] = optarg;
497 file_type_specified = 1;
508 file_type_specified = 1;
515 case_GETOPT_HELP_CHAR;
516 case_GETOPT_VERSION_CHAR (PROGRAM_NAME, AUTHORS);
518 usage (EXIT_FAILURE);
521 if (file_type_specified && do_check)
523 error (0, 0, _("the --binary and --text options are meaningless when \
524 verifying checksums"));
525 usage (EXIT_FAILURE);
528 if (n_strings > 0 && do_check)
531 _("the --string and --check options are mutually exclusive"));
532 usage (EXIT_FAILURE);
535 if (status_only && !do_check)
538 _("the --status option is meaningful only when verifying checksums"));
539 usage (EXIT_FAILURE);
542 if (warn && !do_check)
545 _("the --warn option is meaningful only when verifying checksums"));
546 usage (EXIT_FAILURE);
555 error (0, 0, _("no files may be specified when using --string"));
556 usage (EXIT_FAILURE);
558 for (i = 0; i < n_strings; ++i)
561 md5_buffer (string[i], strlen (string[i]), md5buffer);
563 for (cnt = 0; cnt < 16; ++cnt)
564 printf ("%02x", md5buffer[cnt]);
566 printf (" \"%s\"\n", string[i]);
571 if (optind + 1 < argc)
574 _("only one argument may be specified when using --check"));
575 usage (EXIT_FAILURE);
578 err = md5_check ((optind == argc) ? "-" : argv[optind]);
585 for (; optind < argc; ++optind)
588 char *file = argv[optind];
590 fail = md5_file (file, binary, md5buffer);
596 /* Output a leading backslash if the file name contains
597 a newline or backslash. */
598 if (strchr (file, '\n') || strchr (file, '\\'))
601 for (i = 0; i < 16; ++i)
602 printf ("%02x", md5buffer[i]);
610 /* Translate each NEWLINE byte to the string, "\\n",
611 and each backslash to "\\\\". */
612 for (i = 0; i < strlen (file); ++i)
617 fputs ("\\n", stdout);
621 fputs ("\\\\", stdout);
634 if (fclose (stdout) == EOF)
635 error (EXIT_FAILURE, errno, _("write error"));
637 if (have_read_stdin && fclose (stdin) == EOF)
638 error (EXIT_FAILURE, errno, _("standard input"));
640 exit (err == 0 ? EXIT_SUCCESS : EXIT_FAILURE);