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 11typedef 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 */ 18static 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 27static 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 = STDIN_FILENO; 40 if (NOT_LONE_DASH(filename)) { 41 src_fd = open_or_warn(filename, O_RDONLY); 42 if (src_fd < 0) { 43 return NULL; 44 } 45 } 46 47 /* figure specific hash algorithims */ 48 if (ENABLE_MD5SUM && hash_algo==HASH_MD5) { 49 md5_begin(&context.md5); 50 update = (void (*)(const void*, size_t, void*))md5_hash; 51 final = (void (*)(void*, void*))md5_end; 52 hash_len = 16; 53 } else if (ENABLE_SHA1SUM && hash_algo==HASH_SHA1) { 54 sha1_begin(&context.sha1); 55 update = (void (*)(const void*, size_t, void*))sha1_hash; 56 final = (void (*)(void*, void*))sha1_end; 57 hash_len = 20; 58 } else { 59 bb_error_msg_and_die("algorithm not supported"); 60 } 61 62 while (0 < (count = safe_read(src_fd, in_buf, 4096))) { 63 update(in_buf, count, &context); 64 } 65 66 if (count == 0) { 67 final(in_buf, &context); 68 hash_value = hash_bin_to_hex(in_buf, hash_len); 69 } 70 71 RELEASE_CONFIG_BUFFER(in_buf); 72 73 if (src_fd != STDIN_FILENO) { 74 close(src_fd); 75 } 76 77 return hash_value; 78} 79 80int md5_sha1_sum_main(int argc, char **argv); 81int md5_sha1_sum_main(int argc, char **argv) 82{ 83 int return_value = EXIT_SUCCESS; 84 uint8_t *hash_value; 85 unsigned flags; 86 hash_algo_t hash_algo = ENABLE_MD5SUM 87 ? (ENABLE_SHA1SUM ? (applet_name[0] == 'm' ? HASH_MD5 : HASH_SHA1) : HASH_MD5) 88 : HASH_SHA1; 89 90 if (ENABLE_FEATURE_MD5_SHA1_SUM_CHECK) 91 flags = getopt32(argv, "scw"); 92 else optind = 1; 93 94 if (ENABLE_FEATURE_MD5_SHA1_SUM_CHECK && !(flags & FLAG_CHECK)) { 95 if (flags & FLAG_SILENT) { 96 bb_error_msg_and_die 97 ("-%c is meaningful only when verifying checksums", 's'); 98 } else if (flags & FLAG_WARN) { 99 bb_error_msg_and_die 100 ("-%c is meaningful only when verifying checksums", 'w'); 101 } 102 } 103 104 if (argc == optind) { 105 argv[argc++] = (char*)"-"; 106 } 107 108 if (ENABLE_FEATURE_MD5_SHA1_SUM_CHECK && (flags & FLAG_CHECK)) { 109 FILE *pre_computed_stream; 110 int count_total = 0; 111 int count_failed = 0; 112 char *file_ptr = argv[optind]; 113 char *line; 114 115 if (optind + 1 != argc) { 116 bb_error_msg_and_die 117 ("only one argument may be specified when using -c"); 118 } 119 120 pre_computed_stream = stdin; 121 if (NOT_LONE_DASH(file_ptr)) { 122 pre_computed_stream = xfopen(file_ptr, "r"); 123 } 124 125 while ((line = xmalloc_getline(pre_computed_stream)) != NULL) { 126 char *filename_ptr; 127 128 count_total++; 129 filename_ptr = strstr(line, " "); 130 /* handle format for binary checksums */ 131 if (filename_ptr == NULL) { 132 filename_ptr = strstr(line, " *"); 133 } 134 if (filename_ptr == NULL) { 135 if (flags & FLAG_WARN) { 136 bb_error_msg("invalid format"); 137 } 138 count_failed++; 139 return_value = EXIT_FAILURE; 140 free(line); 141 continue; 142 } 143 *filename_ptr = '\0'; 144 filename_ptr += 2; 145 146 hash_value = hash_file(filename_ptr, hash_algo); 147 148 if (hash_value && (strcmp((char*)hash_value, line) == 0)) { 149 if (!(flags & FLAG_SILENT)) 150 printf("%s: OK\n", filename_ptr); 151 } else { 152 if (!(flags & FLAG_SILENT)) 153 printf("%s: FAILED\n", filename_ptr); 154 count_failed++; 155 return_value = EXIT_FAILURE; 156 } 157 /* possible free(NULL) */ 158 free(hash_value); 159 free(line); 160 } 161 if (count_failed && !(flags & FLAG_SILENT)) { 162 bb_error_msg("WARNING: %d of %d computed checksums did NOT match", 163 count_failed, count_total); 164 } 165 /* 166 if (fclose_if_not_stdin(pre_computed_stream) == EOF) { 167 bb_perror_msg_and_die("cannot close file %s", file_ptr); 168 } 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} 185