sha1sum option to compare checksums

diff --git a/coreutils/Config.in b/coreutils/Config.in
index 0d5eff3..2bcc48a 100644 (file)
--- a/coreutils/Config.in
+++ b/coreutils/Config.in
@@ -342,6 +342,13 @@ config CONFIG_SHA1SUM
        help
          Compute and check SHA1 message digest
 
+config CONFIG_FEATURE_SHA1SUM_CHECK
+       bool "  Enale -c and -w options"
+       default n
+       help
+         Enabling the -c and -w options allow files to be checked
+         against pre-calculated hash values.
+
 config CONFIG_SLEEP
        bool "sleep (single integer arg with no suffix)"
        default n

diff --git a/coreutils/sha1sum.c b/coreutils/sha1sum.c
index 1c31e3c..7071fb6 100644 (file)
--- a/coreutils/sha1sum.c
+++ b/coreutils/sha1sum.c
@@ -148,81 +148,151 @@ static char sha1sum_stream(FILE *fd, unsigned int *hashval)
        return(EXIT_SUCCESS);
 }
 
-static void print_hash(unsigned int *hash_value, unsigned char hash_length, unsigned char *filename)
+#define FLAG_SILENT    1
+#define FLAG_CHECK     2
+#define FLAG_WARN      4
+
+static unsigned char *hash_bin_to_hex(unsigned int *hash_value, unsigned char hash_length)
 {
        unsigned char x;
+       unsigned char *hex_value;
 
+       hex_value = xmalloc(hash_length * 8);
        for (x = 0; x < hash_length; x++) {
-               printf("%08x", hash_value[x]);
+               sprintf(&hex_value[x * 8], "%08x", hash_value[x]);
        }
-       putchar(' ');
-       putchar(' ');
-       puts(filename);
+       return(hex_value);
 }
 
-#define FLAG_SILENT    1
-#define FLAG_CHECK     2
-#define FLAG_WARN      3
+FILE *wfopen_file_or_stdin(const char *file_ptr)
+{
+       FILE *stream;
 
-/* This should become a common function used by sha1sum and md5sum,
- * it needs extra functionality first
- */
+       if ((file_ptr[0] == '-') && (file_ptr[1] == '\0')) {
+               stream = stdin;
+       } else {
+               stream = bb_wfopen(file_ptr, "r");
+       }
+
+       return(stream);
+}
+
+/* This could become a common function for md5 as well, by using md5_stream */
 extern int authenticate(int argc, char **argv, char (*hash_ptr)(FILE *stream, unsigned int *hashval), const unsigned char hash_length)
 {
        unsigned int hash_value[hash_length];
-       unsigned char flags = 0;
-       int opt;
-       int return_value;
-
-       while ((opt = getopt(argc, argv, "sc:w")) != -1) {
-               switch (opt) {
-               case 's':       /* Dont output anything, status code shows success */
-                       flags |= FLAG_SILENT;
-                       break;
-#if 0
-               case 'c':       /* Check a list of checksums against stored values  */
-                       break;
-               case 'w':       /* Warn of bad formatting when checking files */
-                       break;
+       unsigned int flags;
+       int return_value = EXIT_SUCCESS;
+
+#ifdef CONFIG_FEATURE_SHA1SUM_CHECK
+       flags = bb_getopt_ulflags(argc, argv, "scw");
+#else
+       flags = bb_getopt_ulflags(argc, argv, "s");
 #endif
-               default:
-                       bb_show_usage();
+
+#ifdef CONFIG_FEATURE_SHA1SUM_CHECK
+       if (!(flags & FLAG_CHECK)) {
+               if (flags & FLAG_SILENT) {
+                       bb_error_msg_and_die("the -s option is meaningful only when verifying checksums");
+               }
+               else if (flags & FLAG_WARN) {
+                       bb_error_msg_and_die("the -w option is meaningful only when verifying checksums");
                }
        }
+#endif
 
        if (argc == optind) {
                argv[argc++] = "-";
        }
 
-       return_value = EXIT_SUCCESS;
-       while (optind < argc) {
-               FILE *stream;
+#ifdef CONFIG_FEATURE_SHA1SUM_CHECK
+       if (flags & FLAG_CHECK) {
+               FILE *pre_computed_stream;
+               int count_total = 0;
+               int count_failed = 0;
                unsigned char *file_ptr = argv[optind];
 
-               optind++;
+               if (optind + 1 != argc) {
+                       bb_error_msg_and_die("only one argument may be specified when using -c");
+               }
+               pre_computed_stream = wfopen_file_or_stdin(file_ptr);
+               while (!feof(pre_computed_stream) && !ferror(pre_computed_stream)) {
+                       FILE *stream;
+                       char *line;
+                       char *line_ptr;
+                       char *hex_value;
 
-               if ((file_ptr[0] == '-') && (file_ptr[1] == '\0')) {
-                       stream = stdin;
-               } else {
-                       stream = bb_wfopen(file_ptr, "r");
-                       if (stream == NULL) {
-                               return_value = EXIT_FAILURE;
+                       line = bb_get_chomped_line_from_file(pre_computed_stream);
+                       if (line == NULL) {
+                               break;
+                       }
+                       count_total++;
+                       line_ptr = strchr(line, ' ');
+                       if (line_ptr == NULL) {
+                               if (flags & FLAG_WARN) {
+                                       bb_error_msg("Invalid format");
+                               }
+                               free(line);
+                               continue;
+                       }
+                       *line_ptr = '\0';
+                       line_ptr++;
+                       if ((flags & FLAG_WARN) && (*line_ptr != ' ')) {
+                               bb_error_msg("Invalid format");
+                               free(line);
                                continue;
                        }
+                       line_ptr++;
+                       stream = bb_wfopen(line_ptr, "r");
+                       if (hash_ptr(stream, hash_value) == EXIT_FAILURE) {
+                               return_value = EXIT_FAILURE;
+                       }
+                       if (fclose(stream) == EOF) {
+                               bb_perror_msg("Couldnt close file %s", file_ptr);
+                       }                               
+                       hex_value = hash_bin_to_hex(hash_value, hash_length);
+                       printf("%s: ", line_ptr);
+                       if (strcmp(hex_value, line) != 0) {
+                               puts("FAILED");
+                               count_failed++;
+                       } else {
+                               puts("ok");
+                       }
+                       free(line);
                }
-               if (hash_ptr(stream, hash_value) == EXIT_FAILURE) {
-                       return_value = EXIT_FAILURE;
+               if (count_failed) {
+                       bb_error_msg("WARNING: %d of %d computed checksum did NOT match", count_failed, count_total);
                }
-               else if (!flags & FLAG_SILENT) {
-                       print_hash(hash_value, hash_length, file_ptr);
+               if (bb_fclose_nonstdin(pre_computed_stream) == EOF) {
+                       bb_perror_msg_and_die("Couldnt close file %s", file_ptr);
                }
+       } else
+#endif
+               while (optind < argc) {
+                       FILE *stream;
+                       unsigned char *file_ptr = argv[optind];
 
-               if (fclose(stream) == EOF) {
-                       bb_perror_msg("Couldnt close file %s", file_ptr);
-                       return_value = EXIT_FAILURE;
-               }
+                       optind++;
 
-       }
+                       stream = wfopen_file_or_stdin(file_ptr);
+                       if (stream == NULL) {
+                               return_value = EXIT_FAILURE;
+                               continue;
+                       }
+                       if (hash_ptr(stream, hash_value) == EXIT_FAILURE) {
+                               return_value = EXIT_FAILURE;
+                       }
+                       else if (!flags & FLAG_SILENT) {
+                               char *hex_value = hash_bin_to_hex(hash_value, hash_length);
+                               printf("%s  %s\n", hex_value, file_ptr);
+                               free(hex_value);
+                       }
+
+                       if (bb_fclose_nonstdin(stream) == EOF) {
+                               bb_perror_msg("Couldnt close file %s", file_ptr);
+                               return_value = EXIT_FAILURE;
+                       }
+               }
 
        return(return_value);
 }