1 | /* vi: set sw=4 ts=4: */
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2 | /*
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3 | * tag.c - allocation/initialization/free routines for tag structs
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4 | *
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5 | * Copyright (C) 2001 Andreas Dilger
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6 | * Copyright (C) 2003 Theodore Ts'o
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7 | *
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8 | * %Begin-Header%
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9 | * This file may be redistributed under the terms of the
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10 | * GNU Lesser General Public License.
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11 | * %End-Header%
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12 | */
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13 |
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14 | #include <stdlib.h>
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15 | #include <string.h>
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16 | #include <stdio.h>
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17 |
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18 | #include "blkidP.h"
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19 |
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20 | static blkid_tag blkid_new_tag(void)
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21 | {
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22 | blkid_tag tag;
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23 |
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24 | if (!(tag = (blkid_tag) calloc(1, sizeof(struct blkid_struct_tag))))
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25 | return NULL;
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26 |
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27 | INIT_LIST_HEAD(&tag->bit_tags);
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28 | INIT_LIST_HEAD(&tag->bit_names);
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29 |
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30 | return tag;
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31 | }
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32 |
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33 | #ifdef CONFIG_BLKID_DEBUG
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34 | void blkid_debug_dump_tag(blkid_tag tag)
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35 | {
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36 | if (!tag) {
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37 | printf(" tag: NULL\n");
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38 | return;
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39 | }
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40 |
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41 | printf(" tag: %s=\"%s\"\n", tag->bit_name, tag->bit_val);
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42 | }
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43 | #endif
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44 |
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45 | void blkid_free_tag(blkid_tag tag)
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46 | {
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47 | if (!tag)
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48 | return;
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49 |
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50 | DBG(DEBUG_TAG, printf(" freeing tag %s=%s\n", tag->bit_name,
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51 | tag->bit_val ? tag->bit_val : "(NULL)"));
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52 | DBG(DEBUG_TAG, blkid_debug_dump_tag(tag));
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53 |
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54 | list_del(&tag->bit_tags); /* list of tags for this device */
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55 | list_del(&tag->bit_names); /* list of tags with this type */
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56 |
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57 | free(tag->bit_name);
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58 | free(tag->bit_val);
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59 | free(tag);
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60 | }
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61 |
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62 | /*
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63 | * Find the desired tag on a device. If value is NULL, then the
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64 | * first such tag is returned, otherwise return only exact tag if found.
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65 | */
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66 | blkid_tag blkid_find_tag_dev(blkid_dev dev, const char *type)
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67 | {
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68 | struct list_head *p;
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69 |
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70 | if (!dev || !type)
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71 | return NULL;
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72 |
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73 | list_for_each(p, &dev->bid_tags) {
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74 | blkid_tag tmp = list_entry(p, struct blkid_struct_tag,
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75 | bit_tags);
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76 |
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77 | if (!strcmp(tmp->bit_name, type))
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78 | return tmp;
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79 | }
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80 | return NULL;
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81 | }
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82 |
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83 | /*
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84 | * Find the desired tag type in the cache.
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85 | * We return the head tag for this tag type.
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86 | */
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87 | static blkid_tag blkid_find_head_cache(blkid_cache cache, const char *type)
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88 | {
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89 | blkid_tag head = NULL, tmp;
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90 | struct list_head *p;
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91 |
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92 | if (!cache || !type)
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93 | return NULL;
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94 |
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95 | list_for_each(p, &cache->bic_tags) {
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96 | tmp = list_entry(p, struct blkid_struct_tag, bit_tags);
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97 | if (!strcmp(tmp->bit_name, type)) {
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98 | DBG(DEBUG_TAG,
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99 | printf(" found cache tag head %s\n", type));
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100 | head = tmp;
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101 | break;
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102 | }
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103 | }
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104 | return head;
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105 | }
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106 |
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107 | /*
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108 | * Set a tag on an existing device.
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109 | *
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110 | * If value is NULL, then delete the tagsfrom the device.
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111 | */
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112 | int blkid_set_tag(blkid_dev dev, const char *name,
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113 | const char *value, const int vlength)
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114 | {
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115 | blkid_tag t = 0, head = 0;
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116 | char *val = 0;
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117 |
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118 | if (!dev || !name)
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119 | return -BLKID_ERR_PARAM;
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120 |
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121 | if (!(val = blkid_strndup(value, vlength)) && value)
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122 | return -BLKID_ERR_MEM;
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123 | t = blkid_find_tag_dev(dev, name);
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124 | if (!value) {
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125 | blkid_free_tag(t);
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126 | } else if (t) {
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127 | if (!strcmp(t->bit_val, val)) {
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128 | /* Same thing, exit */
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129 | free(val);
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130 | return 0;
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131 | }
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132 | free(t->bit_val);
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133 | t->bit_val = val;
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134 | } else {
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135 | /* Existing tag not present, add to device */
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136 | if (!(t = blkid_new_tag()))
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137 | goto errout;
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138 | t->bit_name = blkid_strdup(name);
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139 | t->bit_val = val;
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140 | t->bit_dev = dev;
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141 |
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142 | list_add_tail(&t->bit_tags, &dev->bid_tags);
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143 |
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144 | if (dev->bid_cache) {
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145 | head = blkid_find_head_cache(dev->bid_cache,
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146 | t->bit_name);
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147 | if (!head) {
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148 | head = blkid_new_tag();
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149 | if (!head)
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150 | goto errout;
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151 |
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152 | DBG(DEBUG_TAG,
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153 | printf(" creating new cache tag head %s\n", name));
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154 | head->bit_name = blkid_strdup(name);
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155 | if (!head->bit_name)
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156 | goto errout;
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157 | list_add_tail(&head->bit_tags,
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158 | &dev->bid_cache->bic_tags);
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159 | }
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160 | list_add_tail(&t->bit_names, &head->bit_names);
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161 | }
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162 | }
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163 |
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164 | /* Link common tags directly to the device struct */
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165 | if (!strcmp(name, "TYPE"))
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166 | dev->bid_type = val;
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167 | else if (!strcmp(name, "LABEL"))
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168 | dev->bid_label = val;
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169 | else if (!strcmp(name, "UUID"))
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170 | dev->bid_uuid = val;
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171 |
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172 | if (dev->bid_cache)
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173 | dev->bid_cache->bic_flags |= BLKID_BIC_FL_CHANGED;
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174 | return 0;
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175 |
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176 | errout:
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177 | blkid_free_tag(t);
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178 | if (!t)
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179 | free(val);
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180 | blkid_free_tag(head);
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181 | return -BLKID_ERR_MEM;
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182 | }
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183 |
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184 |
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185 | /*
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186 | * Parse a "NAME=value" string. This is slightly different than
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187 | * parse_token, because that will end an unquoted value at a space, while
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188 | * this will assume that an unquoted value is the rest of the token (e.g.
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189 | * if we are passed an already quoted string from the command-line we don't
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190 | * have to both quote and escape quote so that the quotes make it to
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191 | * us).
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192 | *
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193 | * Returns 0 on success, and -1 on failure.
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194 | */
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195 | int blkid_parse_tag_string(const char *token, char **ret_type, char **ret_val)
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196 | {
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197 | char *name, *value, *cp;
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198 |
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199 | DBG(DEBUG_TAG, printf("trying to parse '%s' as a tag\n", token));
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200 |
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201 | if (!token || !(cp = strchr(token, '=')))
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202 | return -1;
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203 |
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204 | name = blkid_strdup(token);
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205 | if (!name)
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206 | return -1;
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207 | value = name + (cp - token);
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208 | *value++ = '\0';
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209 | if (*value == '"' || *value == '\'') {
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210 | char c = *value++;
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211 | if (!(cp = strrchr(value, c)))
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212 | goto errout; /* missing closing quote */
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213 | *cp = '\0';
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214 | }
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215 | value = blkid_strdup(value);
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216 | if (!value)
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217 | goto errout;
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218 |
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219 | *ret_type = name;
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220 | *ret_val = value;
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221 |
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222 | return 0;
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223 |
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224 | errout:
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225 | free(name);
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226 | return -1;
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227 | }
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228 |
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229 | /*
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230 | * Tag iteration routines for the public libblkid interface.
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231 | *
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232 | * These routines do not expose the list.h implementation, which are a
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233 | * contamination of the namespace, and which force us to reveal far, far
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234 | * too much of our internal implemenation. I'm not convinced I want
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235 | * to keep list.h in the long term, anyway. It's fine for kernel
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236 | * programming, but performance is not the #1 priority for this
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237 | * library, and I really don't like the tradeoff of type-safety for
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238 | * performance for this application. [tytso:20030125.2007EST]
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239 | */
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240 |
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241 | /*
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242 | * This series of functions iterate over all tags in a device
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243 | */
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244 | #define TAG_ITERATE_MAGIC 0x01a5284c
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245 |
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246 | struct blkid_struct_tag_iterate {
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247 | int magic;
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248 | blkid_dev dev;
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249 | struct list_head *p;
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250 | };
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251 |
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252 | blkid_tag_iterate blkid_tag_iterate_begin(blkid_dev dev)
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253 | {
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254 | blkid_tag_iterate iter;
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255 |
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256 | iter = xmalloc(sizeof(struct blkid_struct_tag_iterate));
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257 | iter->magic = TAG_ITERATE_MAGIC;
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258 | iter->dev = dev;
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259 | iter->p = dev->bid_tags.next;
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260 | return iter;
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261 | }
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262 |
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263 | /*
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264 | * Return 0 on success, -1 on error
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265 | */
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266 | extern int blkid_tag_next(blkid_tag_iterate iter,
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267 | const char **type, const char **value)
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268 | {
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269 | blkid_tag tag;
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270 |
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271 | *type = 0;
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272 | *value = 0;
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273 | if (!iter || iter->magic != TAG_ITERATE_MAGIC ||
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274 | iter->p == &iter->dev->bid_tags)
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275 | return -1;
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276 | tag = list_entry(iter->p, struct blkid_struct_tag, bit_tags);
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277 | *type = tag->bit_name;
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278 | *value = tag->bit_val;
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279 | iter->p = iter->p->next;
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280 | return 0;
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281 | }
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282 |
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283 | void blkid_tag_iterate_end(blkid_tag_iterate iter)
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284 | {
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285 | if (!iter || iter->magic != TAG_ITERATE_MAGIC)
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286 | return;
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287 | iter->magic = 0;
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288 | free(iter);
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289 | }
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290 |
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291 | /*
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292 | * This function returns a device which matches a particular
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293 | * type/value pair. If there is more than one device that matches the
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294 | * search specification, it returns the one with the highest priority
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295 | * value. This allows us to give preference to EVMS or LVM devices.
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296 | *
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297 | * XXX there should also be an interface which uses an iterator so we
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298 | * can get all of the devices which match a type/value search parameter.
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299 | */
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300 | extern blkid_dev blkid_find_dev_with_tag(blkid_cache cache,
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301 | const char *type,
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302 | const char *value)
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303 | {
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304 | blkid_tag head;
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305 | blkid_dev dev;
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306 | int pri;
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307 | struct list_head *p;
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308 |
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309 | if (!cache || !type || !value)
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310 | return NULL;
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311 |
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312 | blkid_read_cache(cache);
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313 |
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314 | DBG(DEBUG_TAG, printf("looking for %s=%s in cache\n", type, value));
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315 |
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316 | try_again:
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317 | pri = -1;
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318 | dev = 0;
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319 | head = blkid_find_head_cache(cache, type);
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320 |
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321 | if (head) {
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322 | list_for_each(p, &head->bit_names) {
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323 | blkid_tag tmp = list_entry(p, struct blkid_struct_tag,
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324 | bit_names);
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325 |
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326 | if (!strcmp(tmp->bit_val, value) &&
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327 | tmp->bit_dev->bid_pri > pri) {
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328 | dev = tmp->bit_dev;
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329 | pri = dev->bid_pri;
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330 | }
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331 | }
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332 | }
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333 | if (dev && !(dev->bid_flags & BLKID_BID_FL_VERIFIED)) {
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334 | dev = blkid_verify(cache, dev);
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335 | if (dev && (dev->bid_flags & BLKID_BID_FL_VERIFIED))
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336 | goto try_again;
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337 | }
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338 |
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339 | if (!dev && !(cache->bic_flags & BLKID_BIC_FL_PROBED)) {
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340 | if (blkid_probe_all(cache) < 0)
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341 | return NULL;
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342 | goto try_again;
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343 | }
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344 | return dev;
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345 | }
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346 |
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347 | #ifdef TEST_PROGRAM
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348 | #ifdef HAVE_GETOPT_H
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349 | #include <getopt.h>
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350 | #else
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351 | extern char *optarg;
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352 | extern int optind;
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353 | #endif
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354 |
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355 | void usage(char *prog)
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356 | {
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357 | fprintf(stderr, "Usage: %s [-f blkid_file] [-m debug_mask] device "
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358 | "[type value]\n",
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359 | prog);
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360 | fprintf(stderr, "\tList all tags for a device and exit\n", prog);
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361 | exit(1);
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362 | }
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363 |
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364 | int main(int argc, char **argv)
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365 | {
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366 | blkid_tag_iterate iter;
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367 | blkid_cache cache = NULL;
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368 | blkid_dev dev;
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369 | int c, ret, found;
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370 | int flags = BLKID_DEV_FIND;
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371 | char *tmp;
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372 | char *file = NULL;
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373 | char *devname = NULL;
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374 | char *search_type = NULL;
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375 | char *search_value = NULL;
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376 | const char *type, *value;
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377 |
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378 | while ((c = getopt (argc, argv, "m:f:")) != EOF)
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379 | switch (c) {
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380 | case 'f':
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381 | file = optarg;
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382 | break;
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383 | case 'm':
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384 | blkid_debug_mask = strtoul (optarg, &tmp, 0);
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385 | if (*tmp) {
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386 | fprintf(stderr, "Invalid debug mask: %d\n",
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387 | optarg);
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388 | exit(1);
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389 | }
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390 | break;
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391 | case '?':
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392 | usage(argv[0]);
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393 | }
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394 | if (argc > optind)
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395 | devname = argv[optind++];
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396 | if (argc > optind)
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397 | search_type = argv[optind++];
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398 | if (argc > optind)
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399 | search_value = argv[optind++];
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400 | if (!devname || (argc != optind))
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401 | usage(argv[0]);
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402 |
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403 | if ((ret = blkid_get_cache(&cache, file)) != 0) {
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404 | fprintf(stderr, "%s: error creating cache (%d)\n",
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405 | argv[0], ret);
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406 | exit(1);
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407 | }
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408 |
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409 | dev = blkid_get_dev(cache, devname, flags);
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410 | if (!dev) {
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411 | fprintf(stderr, "%s: cannot find device in blkid cache\n");
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412 | exit(1);
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413 | }
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414 | if (search_type) {
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415 | found = blkid_dev_has_tag(dev, search_type, search_value);
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416 | printf("Device %s: (%s, %s) %s\n", blkid_dev_devname(dev),
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417 | search_type, search_value ? search_value : "NULL",
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418 | found ? "FOUND" : "NOT FOUND");
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419 | return !found;
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420 | }
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421 | printf("Device %s...\n", blkid_dev_devname(dev));
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422 |
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423 | iter = blkid_tag_iterate_begin(dev);
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424 | while (blkid_tag_next(iter, &type, &value) == 0) {
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425 | printf("\tTag %s has value %s\n", type, value);
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426 | }
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427 | blkid_tag_iterate_end(iter);
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428 |
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429 | blkid_put_cache(cache);
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430 | return 0;
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431 | }
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432 | #endif
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