Sat, 19 Oct 2019 09:47:31 +0200
add tool for accessing extended attributes
this tool is needed for testing
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add tool for accessing extended attributes
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1 | /* |
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2 | * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER. |
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3 | * |
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4 | * Copyright 2019 Olaf Wintermann. All rights reserved. |
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5 | * |
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6 | * Redistribution and use in source and binary forms, with or without |
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7 | * modification, are permitted provided that the following conditions are met: |
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8 | * |
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9 | * 1. Redistributions of source code must retain the above copyright |
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10 | * notice, this list of conditions and the following disclaimer. |
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11 | * |
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12 | * 2. Redistributions in binary form must reproduce the above copyright |
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13 | * notice, this list of conditions and the following disclaimer in the |
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14 | * documentation and/or other materials provided with the distribution. |
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15 | * |
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16 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" |
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17 | * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
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18 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
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19 | * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE |
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20 | * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
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21 | * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
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22 | * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
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23 | * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN |
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24 | * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
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25 | * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
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26 | * POSSIBILITY OF SUCH DAMAGE. |
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27 | */ |
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28 | |
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29 | /* |
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30 | * small tool for accessing extended attributes |
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31 | */ |
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32 | |
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33 | #include <stdio.h> |
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34 | #include <stdlib.h> |
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35 | #include <string.h> |
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36 | #include <errno.h> |
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37 | |
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38 | #include "libxattr.h" |
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39 | |
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40 | int attrtool_list(int argc, char **argv, int values); |
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41 | int attrtool_get(int argc, char **argv, int raw); |
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42 | int attrtool_set(int argc, char **argv); |
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43 | |
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44 | void print_usage(char *cmd) { |
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45 | fprintf(stderr, "usage %s:\n", cmd); |
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46 | fprintf(stderr, " list <file>\n"); |
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47 | fprintf(stderr, " listvalues <file>\n"); |
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48 | fprintf(stderr, " get <file> <name>\n"); |
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49 | fprintf(stderr, " set <file> <name> <value>\n"); |
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50 | fprintf(stderr, " getraw <file> <name>\n"); |
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51 | } |
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52 | |
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53 | int main(int argc, char **argv) { |
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54 | if(argc < 3) { |
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55 | print_usage(argv[0]); |
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56 | return 1; |
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57 | } |
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58 | |
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59 | if(!strcmp(argv[1], "list") || !strcmp(argv[1], "ls")) { |
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60 | return attrtool_list(argc, argv, 0); |
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61 | } else if(!strcmp(argv[1], "listvalues") || !strcmp(argv[1], "lsv")) { |
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62 | return attrtool_list(argc, argv, 1); |
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63 | } else if(!strcmp(argv[1], "get")) { |
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64 | return attrtool_get(argc, argv, 0); |
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65 | } else if(!strcmp(argv[1], "getraw")) { |
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66 | return attrtool_get(argc, argv, 1); |
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67 | } else if(!strcmp(argv[1], "set")) { |
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68 | return attrtool_set(argc, argv); |
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69 | } else { |
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70 | fprintf(stderr, "Unknown command\n"); |
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71 | print_usage(argv[0]); |
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72 | } |
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73 | |
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74 | return 1; |
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75 | } |
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76 | |
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77 | int attrtool_list(int argc, char **argv, int values) { |
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78 | ssize_t nelm = 0; |
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79 | char **list = xattr_list(argv[2], &nelm); |
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80 | if(nelm < 0) { |
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81 | perror("xattr_list"); |
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82 | return 3; |
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83 | } |
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84 | |
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85 | for(int i=0;i<nelm;i++) { |
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86 | char *attr = list[i]; |
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87 | if(values) { |
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88 | ssize_t valuelen = 0; |
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89 | char *value = xattr_get(argv[2], attr, &valuelen); |
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90 | if(valuelen < 0) { |
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91 | printf("%s: #ERROR: %s\n", attr, strerror(errno)); |
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92 | } else { |
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93 | printf("%s: %.*s\n", attr, (int)valuelen, value); |
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94 | } |
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95 | |
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96 | if(value) { |
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97 | free(value); |
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98 | } |
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99 | } else { |
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100 | printf("%s\n", attr); |
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101 | } |
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102 | |
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103 | free(list[i]); |
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104 | } |
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105 | if(list) { |
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106 | free(list); |
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107 | } |
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108 | |
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109 | return 0; |
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110 | } |
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111 | |
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112 | int attrtool_get(int argc, char **argv, int raw) { |
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113 | if(argc < 4) { |
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114 | fprintf(stderr, "Too few arguments\n"); |
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115 | print_usage(argv[1]); |
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116 | return 1; |
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117 | } |
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118 | |
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119 | char *file = argv[2]; |
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120 | char *attr = argv[3]; |
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121 | int ret = 0; |
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122 | |
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123 | size_t valuelen = 0; |
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124 | char *value = xattr_get(file, attr, &valuelen); |
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125 | if(value) { |
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126 | if(raw) { |
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127 | fwrite(value, 1, valuelen, stdout); |
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128 | } else { |
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129 | printf("%.*s\n", (int)valuelen, value); |
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130 | } |
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131 | free(value); |
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132 | } else { |
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133 | perror("xattr_get"); |
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134 | ret = 3; |
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135 | } |
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136 | |
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137 | return ret; |
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138 | } |
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139 | |
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140 | int attrtool_set(int argc, char **argv) { |
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141 | if(argc < 4) { |
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142 | fprintf(stderr, "Too few arguments\n"); |
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143 | print_usage(argv[1]); |
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144 | return 1; |
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145 | } |
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146 | |
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147 | size_t len = strlen(argv[4]); |
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148 | char *file = argv[2]; |
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149 | char *attr = argv[3]; |
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150 | char *value = argv[4]; |
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151 | int ret = 0; |
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152 | |
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153 | if(xattr_set(file, attr, value, len)) { |
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154 | perror("xattr_set"); |
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155 | ret = 3; |
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156 | } |
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157 | |
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158 | return ret; |
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159 | } |
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160 |