[821] | 1 | /* vi: set sw=4 ts=4: */
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| 2 | /*
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| 3 | * Copyright (C) 2003 Glenn L. McGrath
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| 4 | * Copyright (C) 2003-2004 Erik Andersen
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| 5 | *
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| 6 | * Licensed under the GPL v2 or later, see the file LICENSE in this tarball.
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| 7 | */
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| 8 |
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| 9 | #include <fcntl.h>
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| 10 | #include <limits.h>
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| 11 | #include <stdio.h>
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| 12 | #include <stdint.h>
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| 13 | #include <stdlib.h>
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| 14 | #include <string.h>
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| 15 | #include <unistd.h>
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| 16 |
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| 17 | #include "busybox.h"
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| 18 |
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| 19 | typedef enum { HASH_SHA1, HASH_MD5 } hash_algo_t;
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| 20 |
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| 21 | #define FLAG_SILENT 1
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| 22 | #define FLAG_CHECK 2
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| 23 | #define FLAG_WARN 4
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| 24 |
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| 25 | /* This might be useful elsewhere */
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| 26 | static unsigned char *hash_bin_to_hex(unsigned char *hash_value,
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| 27 | unsigned char hash_length)
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| 28 | {
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| 29 | int x, len, max;
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| 30 | unsigned char *hex_value;
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| 31 |
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| 32 | max = (hash_length * 2) + 2;
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| 33 | hex_value = xmalloc(max);
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| 34 | for (x = len = 0; x < hash_length; x++) {
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| 35 | len += snprintf((char*)(hex_value + len), max - len, "%02x", hash_value[x]);
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| 36 | }
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| 37 | return (hex_value);
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| 38 | }
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| 39 |
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| 40 | static uint8_t *hash_file(const char *filename, hash_algo_t hash_algo)
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| 41 | {
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| 42 | int src_fd, hash_len, count;
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| 43 | union _ctx_ {
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| 44 | sha1_ctx_t sha1;
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| 45 | md5_ctx_t md5;
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| 46 | } context;
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| 47 | uint8_t *hash_value = NULL;
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| 48 | RESERVE_CONFIG_UBUFFER(in_buf, 4096);
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| 49 | void (*update)(const void*, size_t, void*);
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| 50 | void (*final)(void*, void*);
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| 51 |
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| 52 | if (strcmp(filename, "-") == 0) {
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| 53 | src_fd = STDIN_FILENO;
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| 54 | } else if(0 > (src_fd = open(filename, O_RDONLY))) {
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| 55 | bb_perror_msg("%s", filename);
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| 56 | return NULL;
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| 57 | }
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| 58 |
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| 59 | /* figure specific hash algorithims */
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| 60 | if (ENABLE_MD5SUM && hash_algo==HASH_MD5) {
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| 61 | md5_begin(&context.md5);
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| 62 | update = (void (*)(const void*, size_t, void*))md5_hash;
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| 63 | final = (void (*)(void*, void*))md5_end;
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| 64 | hash_len = 16;
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| 65 | } else if (ENABLE_SHA1SUM && hash_algo==HASH_SHA1) {
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| 66 | sha1_begin(&context.sha1);
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| 67 | update = (void (*)(const void*, size_t, void*))sha1_hash;
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| 68 | final = (void (*)(void*, void*))sha1_end;
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| 69 | hash_len = 20;
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| 70 | } else {
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| 71 | bb_error_msg_and_die("algorithm not supported");
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| 72 | }
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| 73 |
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| 74 | while (0 < (count = read(src_fd, in_buf, 4096))) {
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| 75 | update(in_buf, count, &context);
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| 76 | }
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| 77 |
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| 78 | if (count == 0) {
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| 79 | final(in_buf, &context);
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| 80 | hash_value = hash_bin_to_hex(in_buf, hash_len);
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| 81 | }
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| 82 |
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| 83 | RELEASE_CONFIG_BUFFER(in_buf);
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| 84 |
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| 85 | if (src_fd != STDIN_FILENO) {
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| 86 | close(src_fd);
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| 87 | }
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| 88 |
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| 89 | return hash_value;
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| 90 | }
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| 91 |
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| 92 | /* This could become a common function for md5 as well, by using md5_stream */
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| 93 | static int hash_files(int argc, char **argv, hash_algo_t hash_algo)
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| 94 | {
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| 95 | int return_value = EXIT_SUCCESS;
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| 96 | uint8_t *hash_value;
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| 97 | unsigned int flags;
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| 98 |
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| 99 | if (ENABLE_FEATURE_MD5_SHA1_SUM_CHECK)
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| 100 | flags = bb_getopt_ulflags(argc, argv, "scw");
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[902] | 101 | else optind = 1;
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[821] | 102 |
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| 103 | if (ENABLE_FEATURE_MD5_SHA1_SUM_CHECK && !(flags & FLAG_CHECK)) {
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| 104 | if (flags & FLAG_SILENT) {
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| 105 | bb_error_msg_and_die
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| 106 | ("the -s option is meaningful only when verifying checksums");
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| 107 | } else if (flags & FLAG_WARN) {
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| 108 | bb_error_msg_and_die
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| 109 | ("the -w option is meaningful only when verifying checksums");
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| 110 | }
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| 111 | }
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| 112 |
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| 113 | if (argc == optind) {
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| 114 | argv[argc++] = "-";
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| 115 | }
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| 116 |
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| 117 | if (ENABLE_FEATURE_MD5_SHA1_SUM_CHECK && flags & FLAG_CHECK) {
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| 118 | FILE *pre_computed_stream;
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| 119 | int count_total = 0;
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| 120 | int count_failed = 0;
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| 121 | char *file_ptr = argv[optind];
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| 122 | char *line;
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| 123 |
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| 124 | if (optind + 1 != argc) {
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| 125 | bb_error_msg_and_die
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| 126 | ("only one argument may be specified when using -c");
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| 127 | }
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| 128 |
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| 129 | if (strcmp(file_ptr, "-") == 0) {
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| 130 | pre_computed_stream = stdin;
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| 131 | } else {
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| 132 | pre_computed_stream = bb_xfopen(file_ptr, "r");
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| 133 | }
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| 134 |
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| 135 | while ((line = bb_get_chomped_line_from_file(pre_computed_stream)) != NULL) {
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| 136 | char *filename_ptr;
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| 137 |
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| 138 | count_total++;
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| 139 | filename_ptr = strstr(line, " ");
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| 140 | if (filename_ptr == NULL) {
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| 141 | if (flags & FLAG_WARN) {
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| 142 | bb_error_msg("Invalid format");
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| 143 | }
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| 144 | count_failed++;
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| 145 | return_value = EXIT_FAILURE;
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| 146 | free(line);
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| 147 | continue;
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| 148 | }
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| 149 | *filename_ptr = '\0';
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| 150 | filename_ptr += 2;
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| 151 |
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| 152 | hash_value = hash_file(filename_ptr, hash_algo);
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| 153 |
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| 154 | if (hash_value && (strcmp((char*)hash_value, line) == 0)) {
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| 155 | if (!(flags & FLAG_SILENT))
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| 156 | printf("%s: OK\n", filename_ptr);
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| 157 | } else {
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| 158 | if (!(flags & FLAG_SILENT))
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| 159 | printf("%s: FAILED\n", filename_ptr);
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| 160 | count_failed++;
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| 161 | return_value = EXIT_FAILURE;
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| 162 | }
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| 163 | /* possible free(NULL) */
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| 164 | free(hash_value);
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| 165 | free(line);
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| 166 | }
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| 167 | if (count_failed && !(flags & FLAG_SILENT)) {
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| 168 | bb_error_msg("WARNING: %d of %d computed checksums did NOT match",
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| 169 | count_failed, count_total);
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| 170 | }
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| 171 | if (bb_fclose_nonstdin(pre_computed_stream) == EOF) {
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| 172 | bb_perror_msg_and_die("Couldnt close file %s", file_ptr);
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| 173 | }
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| 174 | } else {
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| 175 | while (optind < argc) {
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| 176 | char *file_ptr = argv[optind++];
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| 177 |
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| 178 | hash_value = hash_file(file_ptr, hash_algo);
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| 179 | if (hash_value == NULL) {
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| 180 | return_value = EXIT_FAILURE;
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| 181 | } else {
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| 182 | printf("%s %s\n", hash_value, file_ptr);
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| 183 | free(hash_value);
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| 184 | }
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| 185 | }
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| 186 | }
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| 187 | return (return_value);
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| 188 | }
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| 189 |
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| 190 | #ifdef CONFIG_MD5SUM
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| 191 | int md5sum_main(int argc, char **argv)
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| 192 | {
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| 193 | return (hash_files(argc, argv, HASH_MD5));
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| 194 | }
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| 195 | #endif
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| 196 |
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| 197 | #ifdef CONFIG_SHA1SUM
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| 198 | int sha1sum_main(int argc, char **argv)
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| 199 | {
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| 200 | return (hash_files(argc, argv, HASH_SHA1));
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| 201 | }
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| 202 | #endif
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