| /* vi: set sw=4 ts=4: */ |
| /* |
| * Copyright (C) 2003 Glenn L. McGrath |
| * Copyright (C) 2003-2004 Erik Andersen |
| * |
| * Licensed under the GPL v2 or later, see the file LICENSE in this tarball. |
| */ |
| |
| #include "busybox.h" |
| |
| typedef enum { HASH_SHA1, HASH_MD5 } hash_algo_t; |
| |
| #define FLAG_SILENT 1 |
| #define FLAG_CHECK 2 |
| #define FLAG_WARN 4 |
| |
| /* This might be useful elsewhere */ |
| static unsigned char *hash_bin_to_hex(unsigned char *hash_value, |
| unsigned char hash_length) |
| { |
| int x, len, max; |
| unsigned char *hex_value; |
| |
| max = (hash_length * 2) + 2; |
| hex_value = xmalloc(max); |
| for (x = len = 0; x < hash_length; x++) { |
| len += snprintf((char*)(hex_value + len), max - len, "%02x", hash_value[x]); |
| } |
| return (hex_value); |
| } |
| |
| static uint8_t *hash_file(const char *filename, hash_algo_t hash_algo) |
| { |
| int src_fd, hash_len, count; |
| union _ctx_ { |
| sha1_ctx_t sha1; |
| md5_ctx_t md5; |
| } context; |
| uint8_t *hash_value = NULL; |
| RESERVE_CONFIG_UBUFFER(in_buf, 4096); |
| void (*update)(const void*, size_t, void*); |
| void (*final)(void*, void*); |
| |
| if (strcmp(filename, "-") == 0) { |
| src_fd = STDIN_FILENO; |
| } else if(0 > (src_fd = open(filename, O_RDONLY))) { |
| bb_perror_msg("%s", filename); |
| return NULL; |
| } |
| |
| /* figure specific hash algorithims */ |
| if (ENABLE_MD5SUM && hash_algo==HASH_MD5) { |
| md5_begin(&context.md5); |
| update = (void (*)(const void*, size_t, void*))md5_hash; |
| final = (void (*)(void*, void*))md5_end; |
| hash_len = 16; |
| } else if (ENABLE_SHA1SUM && hash_algo==HASH_SHA1) { |
| sha1_begin(&context.sha1); |
| update = (void (*)(const void*, size_t, void*))sha1_hash; |
| final = (void (*)(void*, void*))sha1_end; |
| hash_len = 20; |
| } else { |
| bb_error_msg_and_die("algorithm not supported"); |
| } |
| |
| while (0 < (count = read(src_fd, in_buf, 4096))) { |
| update(in_buf, count, &context); |
| } |
| |
| if (count == 0) { |
| final(in_buf, &context); |
| hash_value = hash_bin_to_hex(in_buf, hash_len); |
| } |
| |
| RELEASE_CONFIG_BUFFER(in_buf); |
| |
| if (src_fd != STDIN_FILENO) { |
| close(src_fd); |
| } |
| |
| return hash_value; |
| } |
| |
| /* This could become a common function for md5 as well, by using md5_stream */ |
| static int hash_files(int argc, char **argv, hash_algo_t hash_algo) |
| { |
| int return_value = EXIT_SUCCESS; |
| uint8_t *hash_value; |
| unsigned int flags; |
| |
| if (ENABLE_FEATURE_MD5_SHA1_SUM_CHECK) |
| flags = bb_getopt_ulflags(argc, argv, "scw"); |
| else optind = 1; |
| |
| if (ENABLE_FEATURE_MD5_SHA1_SUM_CHECK && !(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"); |
| } |
| } |
| |
| if (argc == optind) { |
| argv[argc++] = "-"; |
| } |
| |
| if (ENABLE_FEATURE_MD5_SHA1_SUM_CHECK && flags & FLAG_CHECK) { |
| FILE *pre_computed_stream; |
| int count_total = 0; |
| int count_failed = 0; |
| char *file_ptr = argv[optind]; |
| char *line; |
| |
| if (optind + 1 != argc) { |
| bb_error_msg_and_die |
| ("only one argument may be specified when using -c"); |
| } |
| |
| if (strcmp(file_ptr, "-") == 0) { |
| pre_computed_stream = stdin; |
| } else { |
| pre_computed_stream = xfopen(file_ptr, "r"); |
| } |
| |
| while ((line = bb_get_chomped_line_from_file(pre_computed_stream)) != NULL) { |
| char *filename_ptr; |
| |
| count_total++; |
| filename_ptr = strstr(line, " "); |
| if (filename_ptr == NULL) { |
| if (flags & FLAG_WARN) { |
| bb_error_msg("Invalid format"); |
| } |
| count_failed++; |
| return_value = EXIT_FAILURE; |
| free(line); |
| continue; |
| } |
| *filename_ptr = '\0'; |
| filename_ptr += 2; |
| |
| hash_value = hash_file(filename_ptr, hash_algo); |
| |
| if (hash_value && (strcmp((char*)hash_value, line) == 0)) { |
| if (!(flags & FLAG_SILENT)) |
| printf("%s: OK\n", filename_ptr); |
| } else { |
| if (!(flags & FLAG_SILENT)) |
| printf("%s: FAILED\n", filename_ptr); |
| count_failed++; |
| return_value = EXIT_FAILURE; |
| } |
| /* possible free(NULL) */ |
| free(hash_value); |
| free(line); |
| } |
| if (count_failed && !(flags & FLAG_SILENT)) { |
| bb_error_msg("WARNING: %d of %d computed checksums did NOT match", |
| count_failed, count_total); |
| } |
| if (bb_fclose_nonstdin(pre_computed_stream) == EOF) { |
| bb_perror_msg_and_die("Couldnt close file %s", file_ptr); |
| } |
| } else { |
| while (optind < argc) { |
| char *file_ptr = argv[optind++]; |
| |
| hash_value = hash_file(file_ptr, hash_algo); |
| if (hash_value == NULL) { |
| return_value = EXIT_FAILURE; |
| } else { |
| printf("%s %s\n", hash_value, file_ptr); |
| free(hash_value); |
| } |
| } |
| } |
| return (return_value); |
| } |
| |
| #ifdef CONFIG_MD5SUM |
| int md5sum_main(int argc, char **argv) |
| { |
| return (hash_files(argc, argv, HASH_MD5)); |
| } |
| #endif |
| |
| #ifdef CONFIG_SHA1SUM |
| int sha1sum_main(int argc, char **argv) |
| { |
| return (hash_files(argc, argv, HASH_SHA1)); |
| } |
| #endif |