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 "busybox.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 char hash_length)
  20 {
  21         int x, len, max;
  22         unsigned char *hex_value;
  23
  24         max = (hash_length * 2) + 2;
  25         hex_value = xmalloc(max);
  26         for (x = len = 0; x < hash_length; x++) {
  27                 len += snprintf((char*)(hex_value + len), max - len, "%02x", hash_value[x]);
  28         }
  29         return (hex_value);
  30 }
  31
  32 static uint8_t *hash_file(const char *filename, hash_algo_t hash_algo)
  33 {
  34         int src_fd, hash_len, count;
  35         union _ctx_ {
  36                 sha1_ctx_t sha1;
  37                 md5_ctx_t md5;
  38         } context;
  39         uint8_t *hash_value = NULL;
  40         RESERVE_CONFIG_UBUFFER(in_buf, 4096);
  41         void (*update)(const void*, size_t, void*);
  42         void (*final)(void*, void*);
  43
  44         if (strcmp(filename, "-") == 0) {
  45                 src_fd = STDIN_FILENO;
  46         } else if(0 > (src_fd = open(filename, O_RDONLY))) {
  47                 bb_perror_msg("%s", filename);
  48                 return NULL;
  49         }
  50
  51         /* figure specific hash algorithims */
  52         if (ENABLE_MD5SUM && hash_algo==HASH_MD5) {
  53                 md5_begin(&context.md5);
  54                 update = (void (*)(const void*, size_t, void*))md5_hash;
  55                 final = (void (*)(void*, void*))md5_end;
  56                 hash_len = 16;
  57         } else if (ENABLE_SHA1SUM && hash_algo==HASH_SHA1) {
  58                 sha1_begin(&context.sha1);
  59                 update = (void (*)(const void*, size_t, void*))sha1_hash;
  60                 final = (void (*)(void*, void*))sha1_end;
  61                 hash_len = 20;
  62         } else {
  63                 bb_error_msg_and_die("algorithm not supported");
  64         }
  65
  66         while (0 < (count = read(src_fd, in_buf, 4096))) {
  67                 update(in_buf, count, &context);
  68         }
  69
  70         if (count == 0) {
  71                 final(in_buf, &context);
  72                 hash_value = hash_bin_to_hex(in_buf, hash_len);
  73         }
  74
  75         RELEASE_CONFIG_BUFFER(in_buf);
  76
  77         if (src_fd != STDIN_FILENO) {
  78                 close(src_fd);
  79         }
  80
  81         return hash_value;
  82 }
  83
  84 int md5_sha1_sum_main(int argc, char **argv)
  85 {
  86         int return_value = EXIT_SUCCESS;
  87         uint8_t *hash_value;
  88         unsigned int flags;
  89         hash_algo_t hash_algo = ENABLE_MD5SUM ?
  90                                                                 (ENABLE_SHA1SUM ?
  91                                                                         (**argv=='m' ? HASH_MD5 : HASH_SHA1)
  92                                                                 : HASH_MD5)
  93                                                         : HASH_SHA1;
  94
  95         if (ENABLE_FEATURE_MD5_SHA1_SUM_CHECK)
  96                 flags = bb_getopt_ulflags(argc, argv, "scw");
  97         else optind = 1;
  98
  99         if (ENABLE_FEATURE_MD5_SHA1_SUM_CHECK && !(flags & FLAG_CHECK)) {
 100                 if (flags & FLAG_SILENT) {
 101                         bb_error_msg_and_die
 102                                 ("the -s option is meaningful only when verifying checksums");
 103                 } else if (flags & FLAG_WARN) {
 104                         bb_error_msg_and_die
 105                                 ("the -w option is meaningful only when verifying checksums");
 106                 }
 107         }
 108
 109         if (argc == optind) {
 110                 argv[argc++] = "-";
 111         }
 112
 113         if (ENABLE_FEATURE_MD5_SHA1_SUM_CHECK && flags & FLAG_CHECK) {
 114                 FILE *pre_computed_stream;
 115                 int count_total = 0;
 116                 int count_failed = 0;
 117                 char *file_ptr = argv[optind];
 118                 char *line;
 119
 120                 if (optind + 1 != argc) {
 121                         bb_error_msg_and_die
 122                                 ("only one argument may be specified when using -c");
 123                 }
 124
 125                 if (strcmp(file_ptr, "-") == 0) {
 126                         pre_computed_stream = stdin;
 127                 } else {
 128                         pre_computed_stream = xfopen(file_ptr, "r");
 129                 }
 130
 131                 while ((line = bb_get_chomped_line_from_file(pre_computed_stream)) != NULL) {
 132                         char *filename_ptr;
 133
 134                         count_total++;
 135                         filename_ptr = strstr(line, "  ");
 136                         if (filename_ptr == NULL) {
 137                                 if (flags & FLAG_WARN) {
 138                                         bb_error_msg("Invalid format");
 139                                 }
 140                                 count_failed++;
 141                                 return_value = EXIT_FAILURE;
 142                                 free(line);
 143                                 continue;
 144                         }
 145                         *filename_ptr = '\0';
 146                         filename_ptr += 2;
 147
 148                         hash_value = hash_file(filename_ptr, hash_algo);
 149
 150                         if (hash_value && (strcmp((char*)hash_value, line) == 0)) {
 151                                 if (!(flags & FLAG_SILENT))
 152                                         printf("%s: OK\n", filename_ptr);
 153                         } else {
 154                                 if (!(flags & FLAG_SILENT))
 155                                         printf("%s: FAILED\n", filename_ptr);
 156                                 count_failed++;
 157                                 return_value = EXIT_FAILURE;
 158                         }
 159                         /* possible free(NULL) */
 160                         free(hash_value);
 161                         free(line);
 162                 }
 163                 if (count_failed && !(flags & FLAG_SILENT)) {
 164                         bb_error_msg("WARNING: %d of %d computed checksums did NOT match",
 165                                                  count_failed, count_total);
 166                 }
 167                 if (bb_fclose_nonstdin(pre_computed_stream) == EOF) {
 168                         bb_perror_msg_and_die("Couldnt close file %s", file_ptr);
 169                 }
 170         } else {
 171                 while (optind < argc) {
 172                         char *file_ptr = argv[optind++];
 173
 174                         hash_value = hash_file(file_ptr, hash_algo);
 175                         if (hash_value == NULL) {
 176                                 return_value = EXIT_FAILURE;
 177                         } else {
 178                                 printf("%s  %s\n", hash_value, file_ptr);
 179                                 free(hash_value);
 180                         }
 181                 }
 182         }
 183         return (return_value);
 184 }