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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101 | else optind = 1;
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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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