1 | /*
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2 | * volume_id - reads filesystem label and uuid
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3 | *
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4 | * Copyright (C) 2004 Kay Sievers <kay.sievers@vrfy.org>
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5 | *
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6 | * This library is free software; you can redistribute it and/or
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7 | * modify it under the terms of the GNU Lesser General Public
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8 | * License as published by the Free Software Foundation; either
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9 | * version 2.1 of the License, or (at your option) any later version.
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10 | *
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11 | * This library is distributed in the hope that it will be useful,
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12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of
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13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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14 | * Lesser General Public License for more details.
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15 | *
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16 | * You should have received a copy of the GNU Lesser General Public
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17 | * License along with this library; if not, write to the Free Software
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18 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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19 | */
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20 |
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21 | #include "volume_id_internal.h"
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22 |
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23 | struct msdos_partition_entry {
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24 | uint8_t boot_ind;
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25 | uint8_t head;
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26 | uint8_t sector;
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27 | uint8_t cyl;
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28 | uint8_t sys_ind;
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29 | uint8_t end_head;
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30 | uint8_t end_sector;
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31 | uint8_t end_cyl;
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32 | uint32_t start_sect;
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33 | uint32_t nr_sects;
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34 | } PACKED;
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35 |
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36 | #define MSDOS_PARTTABLE_OFFSET 0x1be
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37 | #define MSDOS_SIG_OFF 0x1fe
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38 | #define BSIZE 0x200
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39 | #define DOS_EXTENDED_PARTITION 0x05
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40 | #define LINUX_EXTENDED_PARTITION 0x85
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41 | #define WIN98_EXTENDED_PARTITION 0x0f
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42 | #define LINUX_RAID_PARTITION 0xfd
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43 | #define is_extended(type) \
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44 | (type == DOS_EXTENDED_PARTITION || \
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45 | type == WIN98_EXTENDED_PARTITION || \
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46 | type == LINUX_EXTENDED_PARTITION)
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47 | #define is_raid(type) \
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48 | (type == LINUX_RAID_PARTITION)
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49 |
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50 | int FAST_FUNC volume_id_probe_msdos_part_table(struct volume_id *id, uint64_t off)
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51 | {
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52 | const uint8_t *buf;
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53 | int i;
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54 | uint64_t poff;
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55 | uint64_t plen;
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56 | uint64_t extended = 0;
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57 | uint64_t current;
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58 | uint64_t next;
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59 | int limit;
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60 | int empty = 1;
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61 | struct msdos_partition_entry *part;
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62 | struct volume_id_partition *p;
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63 |
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64 | dbg("probing at offset 0x%llx", (unsigned long long) off);
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65 |
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66 | buf = volume_id_get_buffer(id, off, 0x200);
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67 | if (buf == NULL)
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68 | return -1;
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69 |
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70 | if (buf[MSDOS_SIG_OFF] != 0x55 || buf[MSDOS_SIG_OFF + 1] != 0xaa)
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71 | return -1;
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72 |
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73 | /* check flags on all entries for a valid partition table */
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74 | part = (struct msdos_partition_entry*) &buf[MSDOS_PARTTABLE_OFFSET];
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75 | for (i = 0; i < 4; i++) {
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76 | if (part[i].boot_ind != 0
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77 | && part[i].boot_ind != 0x80
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78 | ) {
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79 | return -1;
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80 | }
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81 |
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82 | if (part[i].nr_sects != 0)
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83 | empty = 0;
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84 | }
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85 | if (empty == 1)
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86 | return -1;
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87 |
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88 | if (id->partitions != NULL)
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89 | free(id->partitions);
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90 | id->partitions = xzalloc(VOLUME_ID_PARTITIONS_MAX *
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91 | sizeof(struct volume_id_partition));
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92 |
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93 | for (i = 0; i < 4; i++) {
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94 | poff = (uint64_t) le32_to_cpu(part[i].start_sect) * BSIZE;
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95 | plen = (uint64_t) le32_to_cpu(part[i].nr_sects) * BSIZE;
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96 |
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97 | if (plen == 0)
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98 | continue;
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99 |
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100 | p = &id->partitions[i];
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101 |
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102 | // p->pt_type_raw = part[i].sys_ind;
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103 |
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104 | if (is_extended(part[i].sys_ind)) {
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105 | dbg("found extended partition at 0x%llx", (unsigned long long) poff);
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106 | // volume_id_set_usage_part(p, VOLUME_ID_PARTITIONTABLE);
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107 | // p->type = "msdos_extended_partition";
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108 | if (extended == 0)
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109 | extended = off + poff;
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110 | } else {
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111 | dbg("found 0x%x data partition at 0x%llx, len 0x%llx",
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112 | part[i].sys_ind, (unsigned long long) poff, (unsigned long long) plen);
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113 |
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114 | // if (is_raid(part[i].sys_ind))
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115 | // volume_id_set_usage_part(p, VOLUME_ID_RAID);
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116 | // else
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117 | // volume_id_set_usage_part(p, VOLUME_ID_UNPROBED);
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118 | }
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119 |
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120 | // p->pt_off = off + poff;
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121 | // p->pt_len = plen;
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122 | id->partition_count = i+1;
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123 | }
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124 |
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125 | next = extended;
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126 | current = extended;
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127 | limit = 50;
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128 |
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129 | /* follow extended partition chain and add data partitions */
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130 | while (next != 0) {
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131 | if (limit-- == 0) {
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132 | dbg("extended chain limit reached");
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133 | break;
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134 | }
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135 |
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136 | buf = volume_id_get_buffer(id, current, 0x200);
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137 | if (buf == NULL)
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138 | break;
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139 |
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140 | part = (struct msdos_partition_entry*) &buf[MSDOS_PARTTABLE_OFFSET];
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141 |
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142 | if (buf[MSDOS_SIG_OFF] != 0x55 || buf[MSDOS_SIG_OFF + 1] != 0xaa)
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143 | break;
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144 |
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145 | next = 0;
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146 |
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147 | for (i = 0; i < 4; i++) {
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148 | poff = (uint64_t) le32_to_cpu(part[i].start_sect) * BSIZE;
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149 | plen = (uint64_t) le32_to_cpu(part[i].nr_sects) * BSIZE;
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150 |
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151 | if (plen == 0)
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152 | continue;
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153 |
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154 | if (is_extended(part[i].sys_ind)) {
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155 | dbg("found extended partition at 0x%llx", (unsigned long long) poff);
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156 | if (next == 0)
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157 | next = extended + poff;
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158 | } else {
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159 | dbg("found 0x%x data partition at 0x%llx, len 0x%llx",
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160 | part[i].sys_ind, (unsigned long long) poff, (unsigned long long) plen);
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161 |
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162 | /* we always start at the 5th entry */
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163 | // while (id->partition_count < 4)
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164 | // volume_id_set_usage_part(&id->partitions[id->partition_count++], VOLUME_ID_UNUSED);
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165 | if (id->partition_count < 4)
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166 | id->partition_count = 4;
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167 |
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168 | p = &id->partitions[id->partition_count];
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169 |
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170 | // if (is_raid(part[i].sys_ind))
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171 | // volume_id_set_usage_part(p, VOLUME_ID_RAID);
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172 | // else
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173 | // volume_id_set_usage_part(p, VOLUME_ID_UNPROBED);
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174 |
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175 | // p->pt_off = current + poff;
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176 | // p->pt_len = plen;
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177 | id->partition_count++;
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178 |
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179 | // p->pt_type_raw = part[i].sys_ind;
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180 |
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181 | if (id->partition_count >= VOLUME_ID_PARTITIONS_MAX) {
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182 | dbg("too many partitions");
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183 | next = 0;
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184 | }
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185 | }
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186 | }
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187 |
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188 | current = next;
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189 | }
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190 |
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191 | // volume_id_set_usage(id, VOLUME_ID_PARTITIONTABLE);
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192 | // id->type = "msdos_partition_table";
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193 |
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194 | return 0;
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195 | }
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