git.maemo.org Git - busybox4maemo/blob - coreutils/md5_sha1_sum.c

   1 /* vi: set sw=4 ts=4: */
   2 /*
   3  *  Copyright (C) 2003 Glenn L. McGrath
   4  *  Copyright (C) 2003-2004 Erik Andersen
   5  *
   6  * Licensed under the GPL v2 or later, see the file LICENSE in this tarball.
   7  */
   8
   9 #include "libbb.h"
  10
  11 typedef enum { HASH_SHA1, HASH_MD5 } hash_algo_t;
  12
  13 #define FLAG_SILENT     1
  14 #define FLAG_CHECK      2
  15 #define FLAG_WARN       4
  16
  17 /* This might be useful elsewhere */
  18 static unsigned char *hash_bin_to_hex(unsigned char *hash_value,
  19                                 unsigned hash_length)
  20 {
  21         /* xzalloc zero-terminates */
  22         char *hex_value = xzalloc((hash_length * 2) + 1);
  23         bin2hex(hex_value, (char*)hash_value, hash_length);
  24         return hex_value;
  25 }
  26
  27 static uint8_t *hash_file(const char *filename, hash_algo_t hash_algo)
  28 {
  29         int src_fd, hash_len, count;
  30         union _ctx_ {
  31                 sha1_ctx_t sha1;
  32                 md5_ctx_t md5;
  33         } context;
  34         uint8_t *hash_value = NULL;
  35         RESERVE_CONFIG_UBUFFER(in_buf, 4096);
  36         void (*update)(const void*, size_t, void*);
  37         void (*final)(void*, void*);
  38
  39         src_fd = open_or_warn_stdin(filename);
  40         if (src_fd < 0) {
  41                 return NULL;
  42         }
  43
  44         /* figure specific hash algorithims */
  45         if (ENABLE_MD5SUM && hash_algo==HASH_MD5) {
  46                 md5_begin(&context.md5);
  47                 update = (void (*)(const void*, size_t, void*))md5_hash;
  48                 final = (void (*)(void*, void*))md5_end;
  49                 hash_len = 16;
  50         } else if (ENABLE_SHA1SUM && hash_algo==HASH_SHA1) {
  51                 sha1_begin(&context.sha1);
  52                 update = (void (*)(const void*, size_t, void*))sha1_hash;
  53                 final = (void (*)(void*, void*))sha1_end;
  54                 hash_len = 20;
  55         } else {
  56                 bb_error_msg_and_die("algorithm not supported");
  57         }
  58
  59         while (0 < (count = safe_read(src_fd, in_buf, 4096))) {
  60                 update(in_buf, count, &context);
  61         }
  62
  63         if (count == 0) {
  64                 final(in_buf, &context);
  65                 hash_value = hash_bin_to_hex(in_buf, hash_len);
  66         }
  67
  68         RELEASE_CONFIG_BUFFER(in_buf);
  69
  70         if (src_fd != STDIN_FILENO) {
  71                 close(src_fd);
  72         }
  73
  74         return hash_value;
  75 }
  76
  77 int md5_sha1_sum_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
  78 int md5_sha1_sum_main(int argc ATTRIBUTE_UNUSED, char **argv)
  79 {
  80         int return_value = EXIT_SUCCESS;
  81         uint8_t *hash_value;
  82         unsigned flags;
  83         hash_algo_t hash_algo = ENABLE_MD5SUM
  84                 ? (ENABLE_SHA1SUM ? (applet_name[0] == 'm' ? HASH_MD5 : HASH_SHA1) : HASH_MD5)
  85                 : HASH_SHA1;
  86
  87         if (ENABLE_FEATURE_MD5_SHA1_SUM_CHECK)
  88                 flags = getopt32(argv, "scw");
  89         else optind = 1;
  90         argv += optind;
  91         //argc -= optind;
  92         if (!*argv)
  93                 *--argv = (char*)"-";
  94
  95         if (ENABLE_FEATURE_MD5_SHA1_SUM_CHECK && !(flags & FLAG_CHECK)) {
  96                 if (flags & FLAG_SILENT) {
  97                         bb_error_msg_and_die
  98                                 ("-%c is meaningful only when verifying checksums", 's');
  99                 } else if (flags & FLAG_WARN) {
 100                         bb_error_msg_and_die
 101                                 ("-%c is meaningful only when verifying checksums", 'w');
 102                 }
 103         }
 104
 105         if (ENABLE_FEATURE_MD5_SHA1_SUM_CHECK && (flags & FLAG_CHECK)) {
 106                 FILE *pre_computed_stream;
 107                 int count_total = 0;
 108                 int count_failed = 0;
 109                 char *line;
 110
 111                 if (argv[1]) {
 112                         bb_error_msg_and_die
 113                                 ("only one argument may be specified when using -c");
 114                 }
 115
 116                 pre_computed_stream = xfopen_stdin(argv[0]);
 117
 118                 while ((line = xmalloc_getline(pre_computed_stream)) != NULL) {
 119                         char *filename_ptr;
 120
 121                         count_total++;
 122                         filename_ptr = strstr(line, "  ");
 123                         /* handle format for binary checksums */
 124                         if (filename_ptr == NULL) {
 125                                 filename_ptr = strstr(line, " *");
 126                         }
 127                         if (filename_ptr == NULL) {
 128                                 if (flags & FLAG_WARN) {
 129                                         bb_error_msg("invalid format");
 130                                 }
 131                                 count_failed++;
 132                                 return_value = EXIT_FAILURE;
 133                                 free(line);
 134                                 continue;
 135                         }
 136                         *filename_ptr = '\0';
 137                         filename_ptr += 2;
 138
 139                         hash_value = hash_file(filename_ptr, hash_algo);
 140
 141                         if (hash_value && (strcmp((char*)hash_value, line) == 0)) {
 142                                 if (!(flags & FLAG_SILENT))
 143                                         printf("%s: OK\n", filename_ptr);
 144                         } else {
 145                                 if (!(flags & FLAG_SILENT))
 146                                         printf("%s: FAILED\n", filename_ptr);
 147                                 count_failed++;
 148                                 return_value = EXIT_FAILURE;
 149                         }
 150                         /* possible free(NULL) */
 151                         free(hash_value);
 152                         free(line);
 153                 }
 154                 if (count_failed && !(flags & FLAG_SILENT)) {
 155                         bb_error_msg("WARNING: %d of %d computed checksums did NOT match",
 156                                                  count_failed, count_total);
 157                 }
 158                 /*
 159                 if (fclose_if_not_stdin(pre_computed_stream) == EOF) {
 160                         bb_perror_msg_and_die("cannot close file %s", file_ptr);
 161                 }
 162                 */
 163         } else {
 164                 do {
 165                         hash_value = hash_file(*argv, hash_algo);
 166                         if (hash_value == NULL) {
 167                                 return_value = EXIT_FAILURE;
 168                         } else {
 169                                 printf("%s  %s\n", hash_value, *argv);
 170                                 free(hash_value);
 171                         }
 172                 } while (*++argv);
 173         }
 174         return return_value;
 175 }