[2725] | 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) 2005 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 | void volume_id_set_unicode16(char *str, size_t len, const uint8_t *buf, enum endian endianess, size_t count)
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| 24 | {
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| 25 | unsigned i, j;
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| 26 | unsigned c;
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| 27 |
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| 28 | j = 0;
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| 29 | for (i = 0; i + 2 <= count; i += 2) {
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| 30 | if (endianess == LE)
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| 31 | c = (buf[i+1] << 8) | buf[i];
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| 32 | else
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| 33 | c = (buf[i] << 8) | buf[i+1];
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[3232] | 34 | if (c == 0)
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[2725] | 35 | break;
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[3232] | 36 | if (j+1 >= len)
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| 37 | break;
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| 38 | if (c < 0x80) {
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| 39 | /* 0xxxxxxx */
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| 40 | } else {
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| 41 | uint8_t topbits = 0xc0;
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[2725] | 42 | if (j+2 >= len)
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| 43 | break;
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[3232] | 44 | if (c < 0x800) {
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| 45 | /* 110yyyxx 10xxxxxx */
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| 46 | } else {
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| 47 | if (j+3 >= len)
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| 48 | break;
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| 49 | /* 1110yyyy 10yyyyxx 10xxxxxx */
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| 50 | str[j++] = (uint8_t) (0xe0 | (c >> 12));
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| 51 | topbits = 0x80;
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| 52 | }
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| 53 | str[j++] = (uint8_t) (topbits | ((c >> 6) & 0x3f));
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| 54 | c = 0x80 | (c & 0x3f);
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[2725] | 55 | }
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[3232] | 56 | str[j++] = (uint8_t) c;
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[2725] | 57 | }
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| 58 | str[j] = '\0';
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| 59 | }
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| 60 |
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| 61 | #ifdef UNUSED
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| 62 | static const char *usage_to_string(enum volume_id_usage usage_id)
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| 63 | {
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| 64 | switch (usage_id) {
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| 65 | case VOLUME_ID_FILESYSTEM:
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| 66 | return "filesystem";
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| 67 | case VOLUME_ID_PARTITIONTABLE:
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| 68 | return "partitiontable";
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| 69 | case VOLUME_ID_OTHER:
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| 70 | return "other";
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| 71 | case VOLUME_ID_RAID:
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| 72 | return "raid";
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| 73 | case VOLUME_ID_DISKLABEL:
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| 74 | return "disklabel";
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| 75 | case VOLUME_ID_CRYPTO:
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| 76 | return "crypto";
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| 77 | case VOLUME_ID_UNPROBED:
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| 78 | return "unprobed";
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| 79 | case VOLUME_ID_UNUSED:
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| 80 | return "unused";
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| 81 | }
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| 82 | return NULL;
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| 83 | }
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| 84 |
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| 85 | void volume_id_set_usage_part(struct volume_id_partition *part, enum volume_id_usage usage_id)
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| 86 | {
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| 87 | part->usage_id = usage_id;
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| 88 | part->usage = usage_to_string(usage_id);
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| 89 | }
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| 90 |
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| 91 | void volume_id_set_usage(struct volume_id *id, enum volume_id_usage usage_id)
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| 92 | {
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| 93 | id->usage_id = usage_id;
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| 94 | id->usage = usage_to_string(usage_id);
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| 95 | }
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| 96 |
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| 97 | void volume_id_set_label_raw(struct volume_id *id, const uint8_t *buf, size_t count)
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| 98 | {
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| 99 | memcpy(id->label_raw, buf, count);
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| 100 | id->label_raw_len = count;
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| 101 | }
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| 102 | #endif
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| 103 |
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| 104 | #ifdef NOT_NEEDED
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| 105 | static size_t strnlen(const char *s, size_t maxlen)
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| 106 | {
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| 107 | size_t i;
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| 108 | if (!maxlen) return 0;
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| 109 | if (!s) return 0;
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| 110 | for (i = 0; *s && i < maxlen; ++s) ++i;
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| 111 | return i;
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| 112 | }
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| 113 | #endif
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| 114 |
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| 115 | void volume_id_set_label_string(struct volume_id *id, const uint8_t *buf, size_t count)
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| 116 | {
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| 117 | unsigned i;
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| 118 |
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| 119 | memcpy(id->label, buf, count);
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| 120 |
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| 121 | /* remove trailing whitespace */
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| 122 | i = strnlen(id->label, count);
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| 123 | while (i--) {
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| 124 | if (!isspace(id->label[i]))
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| 125 | break;
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| 126 | }
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| 127 | id->label[i+1] = '\0';
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| 128 | }
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| 129 |
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| 130 | void volume_id_set_label_unicode16(struct volume_id *id, const uint8_t *buf, enum endian endianess, size_t count)
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| 131 | {
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[3232] | 132 | volume_id_set_unicode16(id->label, sizeof(id->label), buf, endianess, count);
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[2725] | 133 | }
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| 134 |
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| 135 | void volume_id_set_uuid(struct volume_id *id, const uint8_t *buf, enum uuid_format format)
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| 136 | {
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| 137 | unsigned i;
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[3232] | 138 | unsigned count = (format == UUID_DCE_STRING ? VOLUME_ID_UUID_SIZE : 4 << format);
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[2725] | 139 |
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| 140 | // memcpy(id->uuid_raw, buf, count);
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| 141 | // id->uuid_raw_len = count;
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| 142 |
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| 143 | /* if set, create string in the same format, the native platform uses */
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| 144 | for (i = 0; i < count; i++)
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| 145 | if (buf[i] != 0)
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| 146 | goto set;
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| 147 | return; /* all bytes are zero, leave it empty ("") */
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| 148 |
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| 149 | set:
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| 150 | switch (format) {
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| 151 | case UUID_DOS:
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| 152 | sprintf(id->uuid, "%02X%02X-%02X%02X",
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| 153 | buf[3], buf[2], buf[1], buf[0]);
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| 154 | break;
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| 155 | case UUID_NTFS:
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| 156 | sprintf(id->uuid, "%02X%02X%02X%02X%02X%02X%02X%02X",
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| 157 | buf[7], buf[6], buf[5], buf[4],
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| 158 | buf[3], buf[2], buf[1], buf[0]);
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| 159 | break;
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| 160 | case UUID_DCE:
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| 161 | sprintf(id->uuid,
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| 162 | "%02x%02x%02x%02x-%02x%02x-%02x%02x-%02x%02x-%02x%02x%02x%02x%02x%02x",
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| 163 | buf[0], buf[1], buf[2], buf[3],
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| 164 | buf[4], buf[5],
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| 165 | buf[6], buf[7],
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| 166 | buf[8], buf[9],
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| 167 | buf[10], buf[11], buf[12], buf[13], buf[14], buf[15]);
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| 168 | break;
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| 169 | case UUID_DCE_STRING:
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| 170 | memcpy(id->uuid, buf, count);
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| 171 | id->uuid[count] = '\0';
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| 172 | break;
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| 173 | }
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| 174 | }
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| 175 |
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| 176 | /* Do not use xlseek here. With it, single corrupted filesystem
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| 177 | * may result in attempt to seek past device -> exit.
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| 178 | * It's better to ignore such fs and continue. */
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| 179 | void *volume_id_get_buffer(struct volume_id *id, uint64_t off, size_t len)
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| 180 | {
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| 181 | uint8_t *dst;
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| 182 | unsigned small_off;
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| 183 | ssize_t read_len;
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| 184 |
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| 185 | dbg("get buffer off 0x%llx(%llu), len 0x%zx",
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| 186 | (unsigned long long) off, (unsigned long long) off, len);
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| 187 |
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| 188 | /* check if requested area fits in superblock buffer */
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| 189 | if (off + len <= SB_BUFFER_SIZE
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| 190 | /* && off <= SB_BUFFER_SIZE - want this paranoid overflow check? */
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| 191 | ) {
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| 192 | if (id->sbbuf == NULL) {
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| 193 | id->sbbuf = xmalloc(SB_BUFFER_SIZE);
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| 194 | }
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| 195 | small_off = off;
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| 196 | dst = id->sbbuf;
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| 197 |
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| 198 | /* check if we need to read */
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| 199 | len += off;
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| 200 | if (len <= id->sbbuf_len)
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| 201 | goto ret; /* we already have it */
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| 202 |
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| 203 | dbg("read sbbuf len:0x%x", (unsigned) len);
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| 204 | id->sbbuf_len = len;
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| 205 | off = 0;
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| 206 | goto do_read;
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| 207 | }
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| 208 |
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| 209 | if (len > SEEK_BUFFER_SIZE) {
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| 210 | dbg("seek buffer too small %d", SEEK_BUFFER_SIZE);
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| 211 | return NULL;
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| 212 | }
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| 213 | dst = id->seekbuf;
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| 214 |
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| 215 | /* check if we need to read */
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| 216 | if ((off >= id->seekbuf_off)
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| 217 | && ((off + len) <= (id->seekbuf_off + id->seekbuf_len))
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| 218 | ) {
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| 219 | small_off = off - id->seekbuf_off; /* can't overflow */
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| 220 | goto ret; /* we already have it */
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| 221 | }
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| 222 |
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| 223 | id->seekbuf_off = off;
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| 224 | id->seekbuf_len = len;
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| 225 | id->seekbuf = xrealloc(id->seekbuf, len);
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| 226 | small_off = 0;
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| 227 | dst = id->seekbuf;
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| 228 | dbg("read seekbuf off:0x%llx len:0x%zx",
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| 229 | (unsigned long long) off, len);
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| 230 | do_read:
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| 231 | if (lseek(id->fd, off, SEEK_SET) != off) {
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| 232 | dbg("seek(0x%llx) failed", (unsigned long long) off);
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| 233 | goto err;
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| 234 | }
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| 235 | read_len = full_read(id->fd, dst, len);
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| 236 | if (read_len != len) {
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| 237 | dbg("requested 0x%x bytes, got 0x%x bytes",
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| 238 | (unsigned) len, (unsigned) read_len);
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| 239 | err:
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| 240 | /* No filesystem can be this tiny. It's most likely
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| 241 | * non-associated loop device, empty drive and so on.
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| 242 | * Flag it, making it possible to short circuit future
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| 243 | * accesses. Rationale:
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| 244 | * users complained of slow blkid due to empty floppy drives.
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| 245 | */
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| 246 | if (off < 64*1024)
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| 247 | id->error = 1;
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| 248 | /* id->seekbuf_len or id->sbbuf_len is wrong now! Fixing. */
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| 249 | volume_id_free_buffer(id);
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| 250 | return NULL;
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| 251 | }
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| 252 | ret:
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| 253 | return dst + small_off;
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| 254 | }
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| 255 |
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| 256 | void volume_id_free_buffer(struct volume_id *id)
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| 257 | {
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| 258 | free(id->sbbuf);
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| 259 | id->sbbuf = NULL;
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| 260 | id->sbbuf_len = 0;
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| 261 | free(id->seekbuf);
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| 262 | id->seekbuf = NULL;
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| 263 | id->seekbuf_len = 0;
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| 264 | id->seekbuf_off = 0; /* paranoia */
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| 265 | }
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