2 * volume_id - reads volume label and uuid
4 * Copyright (C) 2005-2007 Kay Sievers <kay.sievers@vrfy.org>
6 * This program is free software; you can redistribute it and/or modify it
7 * under the terms of the GNU General Public License as published by the
8 * Free Software Foundation version 2 of the License.
28 #include "libvolume_id.h"
31 #define ARRAY_SIZE(x) (sizeof(x) / sizeof((x)[0]))
34 volume_id_probe_fn_t prober;
38 static const struct prober prober_raid[] = {
39 { volume_id_probe_linux_raid, { "linux_raid", } },
40 { volume_id_probe_ddf_raid, { "ddf_raid", } },
41 { volume_id_probe_intel_software_raid, { "isw_raid", } },
42 { volume_id_probe_lsi_mega_raid, { "lsi_mega_raid", } },
43 { volume_id_probe_via_raid, { "via_raid", } },
44 { volume_id_probe_silicon_medley_raid, { "silicon_medley_raid", } },
45 { volume_id_probe_nvidia_raid, { "nvidia_raid", } },
46 { volume_id_probe_promise_fasttrack_raid, { "promise_fasttrack_raid", } },
47 { volume_id_probe_highpoint_45x_raid, { "highpoint_raid", } },
48 { volume_id_probe_adaptec_raid, { "adaptec_raid", } },
49 { volume_id_probe_jmicron_raid, { "jmicron_raid", } },
50 { volume_id_probe_lvm1, { "lvm1", } },
51 { volume_id_probe_lvm2, { "lvm2", } },
52 { volume_id_probe_highpoint_37x_raid, { "highpoint_raid", } },
55 static const struct prober prober_filesystem[] = {
56 { volume_id_probe_vfat, { "vfat", } },
57 { volume_id_probe_linux_swap, { "swap", } },
58 { volume_id_probe_luks, { "luks", } },
59 { volume_id_probe_xfs, { "xfs", } },
60 { volume_id_probe_ext, { "ext2", "ext3", "jbd", } },
61 { volume_id_probe_reiserfs, { "reiserfs", "reiser4", } },
62 { volume_id_probe_jfs, { "jfs", } },
63 { volume_id_probe_udf, { "udf", } },
64 { volume_id_probe_iso9660, { "iso9660", } },
65 { volume_id_probe_hfs_hfsplus, { "hfs", "hfsplus", } },
66 { volume_id_probe_ufs, { "ufs", } },
67 { volume_id_probe_ntfs, { "ntfs", } },
68 { volume_id_probe_cramfs, { "cramfs", } },
69 { volume_id_probe_romfs, { "romfs", } },
70 { volume_id_probe_hpfs, { "hpfs", } },
71 { volume_id_probe_sysv, { "sysv", "xenix", } },
72 { volume_id_probe_minix, { "minix", } },
73 { volume_id_probe_gfs, { "gfs", } },
74 { volume_id_probe_gfs2, { "gfs2", } },
75 { volume_id_probe_ocfs1, { "ocfs1", } },
76 { volume_id_probe_ocfs2, { "ocfs2", } },
77 { volume_id_probe_vxfs, { "vxfs", } },
78 { volume_id_probe_squashfs, { "squashfs", } },
79 { volume_id_probe_netware, { "netware", } },
82 /* the user can overwrite this log function */
83 static void default_log(int priority, const char *file, int line, const char *format, ...)
88 volume_id_log_fn_t volume_id_log_fn = default_log;
91 * volume_id_get_prober_by_type:
94 * Lookup the probing function for a specific type.
96 * Returns: The probing function for the given type, #NULL otherwise.
98 const volume_id_probe_fn_t *volume_id_get_prober_by_type(const char *type)
105 for (p = 0; p < ARRAY_SIZE(prober_raid); p++)
106 for (n = 0; prober_raid[p].name[n] != NULL; n++)
107 if (strcmp(type, prober_raid[p].name[n]) == 0)
108 return &prober_raid[p].prober;
109 for (p = 0; p < ARRAY_SIZE(prober_filesystem); p++)
110 for (n = 0; prober_filesystem[p].name[n] != NULL; n++)
111 if (strcmp(type, prober_filesystem[p].name[n]) == 0)
112 return &prober_filesystem[p].prober;
117 * volume_id_get_label:
118 * @id: Probing context.
119 * @label: Label string. Must not be freed by the caller.
121 * Get the label string after a successful probe. Unicode
122 * is translated to UTF-8.
124 * Returns: 1 if the value was set, 0 otherwise.
126 int volume_id_get_label(struct volume_id *id, const char **label)
132 if (id->usage_id == VOLUME_ID_UNUSED)
140 * volume_id_get_label_raw:
141 * @id: Probing context.
142 * @label: Label byte array. Must not be freed by the caller.
143 * @len: Length of raw label byte array.
145 * Get the raw label byte array after a successful probe. It may
146 * contain undecoded multibyte character streams.
148 * Returns: 1 if the value was set, 0 otherwise.
150 int volume_id_get_label_raw(struct volume_id *id, const uint8_t **label, size_t *len)
158 if (id->usage_id == VOLUME_ID_UNUSED)
161 *label = id->label_raw;
162 *len = id->label_raw_len;
167 * volume_id_get_uuid:
168 * @id: Probing context.
169 * @uuid: UUID string. Must not be freed by the caller.
171 * Get the raw UUID string after a successful probe.
173 * Returns: 1 if the value was set, 0 otherwise.
175 int volume_id_get_uuid(struct volume_id *id, const char **uuid)
181 if (id->usage_id == VOLUME_ID_UNUSED)
189 * volume_id_get_uuid_raw:
190 * @id: Probing context.
191 * @uuid: UUID byte array. Must not be freed by the caller.
192 * @len: Length of raw UUID byte array.
194 * Get the raw UUID byte array after a successful probe. It may
195 * contain unconverted endianes values.
197 * Returns: 1 if the value was set, 0 otherwise.
199 int volume_id_get_uuid_raw(struct volume_id *id, const uint8_t **uuid, size_t *len)
207 if (id->usage_id == VOLUME_ID_UNUSED)
210 *uuid = id->uuid_raw;
211 *len = id->uuid_raw_len;
216 * volume_id_get_usage:
217 * @id: Probing context.
218 * @usage: Usage string. Must not be freed by the caller.
220 * Get the usage string after a successful probe.
222 * Returns: 1 if the value was set, 0 otherwise.
224 int volume_id_get_usage(struct volume_id *id, const char **usage)
230 if (id->usage_id == VOLUME_ID_UNUSED)
238 * volume_id_get_type:
239 * @id: Probing context
240 * @type: Type string. Must not be freed by the caller.
242 * Get the type string after a successful probe.
244 * Returns: 1 if the value was set, 0 otherwise.
246 int volume_id_get_type(struct volume_id *id, const char **type)
252 if (id->usage_id == VOLUME_ID_UNUSED)
260 * volume_id_get_type_version:
261 * @id: Probing context.
262 * @type_version: Type version string. Must not be freed by the caller.
264 * Get the Type version string after a successful probe.
266 * Returns: 1 if the value was set, 0 otherwise.
268 int volume_id_get_type_version(struct volume_id *id, const char **type_version)
272 if (type_version == NULL)
274 if (id->usage_id == VOLUME_ID_UNUSED)
277 *type_version = id->type_version;
281 static int needs_encoding(const char c)
283 if ((c >= '0' && c <= '9') ||
284 (c >= 'A' && c <= 'Z') ||
285 (c >= 'a' && c <= 'z') ||
286 strchr(ALLOWED_CHARS, c))
292 * volume_id_encode_string:
293 * @str: Input string to be encoded.
294 * @str_enc: Target string to store the encoded input.
295 * @len: Location to store the encoded string. The target string,
296 * which may be four times as long as the input string.
298 * Encode all potentially unsafe characters of a string to the
299 * corresponding hex value prefixed by '\x'.
301 * Returns: 1 if the entire string was copied, 0 otherwise.
303 int volume_id_encode_string(const char *str, char *str_enc, size_t len)
307 if (str == NULL || str_enc == NULL || len == 0)
311 for (i = 0, j = 0; str[i] != '\0'; i++) {
314 seqlen = volume_id_utf8_encoded_valid_unichar(&str[i]);
316 memcpy(&str_enc[j], &str[i], seqlen);
319 } else if (str[i] == '\\' || needs_encoding(str[i])) {
320 sprintf(&str_enc[j], "\\x%02x", (unsigned char) str[i]);
335 /* run only once into a timeout for unreadable devices */
336 static int device_is_readable(struct volume_id *id, uint64_t off)
338 if (volume_id_get_buffer(id, off, 0x200) != NULL)
344 * volume_id_probe_raid:
345 * @id: Probing context.
346 * @off: Probing offset relative to the start of the device.
347 * @size: Total size of the device.
349 * Probe device for all known raid signatures.
351 * Returns: 0 on successful probe, otherwise negative value.
353 int volume_id_probe_raid(struct volume_id *id, uint64_t off, uint64_t size)
360 if (!device_is_readable(id, off))
363 info("probing at offset 0x%llx, size 0x%llx\n",
364 (unsigned long long) off, (unsigned long long) size);
366 for (i = 0; i < ARRAY_SIZE(prober_raid); i++)
367 if (prober_raid[i].prober(id, off, size) == 0)
372 /* If recognized, we free the allocated buffers */
373 volume_id_free_buffer(id);
378 * volume_id_probe_filesystem:
379 * @id: Probing context.
380 * @off: Probing offset relative to the start of the device.
381 * @size: Total size of the device.
383 * Probe device for all known filesystem signatures.
385 * Returns: 0 on successful probe, otherwise negative value.
387 int volume_id_probe_filesystem(struct volume_id *id, uint64_t off, uint64_t size)
394 if (!device_is_readable(id, off))
397 info("probing at offset 0x%llx, size 0x%llx\n",
398 (unsigned long long) off, (unsigned long long) size);
400 for (i = 0; i < ARRAY_SIZE(prober_filesystem); i++)
401 if (prober_filesystem[i].prober(id, off, size) == 0)
406 /* If recognized, we free the allocated buffers */
407 volume_id_free_buffer(id);
412 * volume_id_probe_all:
413 * @id: Probing context.
414 * @off: Probing offset relative to the start of the device.
415 * @size: Total size of the device.
417 * Probe device for all known raid and filesystem signatures.
419 * Returns: 0 on successful probe, otherwise negative value.
421 int volume_id_probe_all(struct volume_id *id, uint64_t off, uint64_t size)
426 if (!device_is_readable(id, off))
429 /* probe for raid first, because fs probes may be successful on raid members */
430 if (volume_id_probe_raid(id, off, size) == 0)
433 if (volume_id_probe_filesystem(id, off, size) == 0)
440 * volume_id_probe_raid:
441 * @all_probers_fn: prober function to called for all known probing routines.
442 * @id: Context passed to prober function.
443 * @off: Offset value passed to prober function.
444 * @size: Size value passed to prober function.
445 * @data: Arbitrary data passed to the prober function.
447 * Run a custom function for all known probing routines.
449 void volume_id_all_probers(all_probers_fn_t all_probers_fn,
450 struct volume_id *id, uint64_t off, uint64_t size,
455 if (all_probers_fn == NULL)
458 for (i = 0; i < ARRAY_SIZE(prober_raid); i++)
459 if (all_probers_fn(prober_raid[i].prober, id, off, size, data) != 0)
461 for (i = 0; i < ARRAY_SIZE(prober_filesystem); i++)
462 if (all_probers_fn(prober_filesystem[i].prober, id, off, size, data) != 0)
470 * @id: Probing context.
471 * @fd: Open file descriptor of device to read from.
473 * Create the context for probing.
475 * Returns: Probing context, or #NULL on failure.
477 struct volume_id *volume_id_open_fd(int fd)
479 struct volume_id *id;
481 id = malloc(sizeof(struct volume_id));
484 memset(id, 0x00, sizeof(struct volume_id));
491 struct volume_id *volume_id_open_node(const char *path)
493 struct volume_id *id;
496 fd = open(path, O_RDONLY);
498 dbg("unable to open '%s'\n", path);
502 id = volume_id_open_fd(fd);
506 /* close fd on device close */
514 * @id: Probing context.
516 * Release probing context and free all associated data.
518 void volume_id_close(struct volume_id *id)
523 if (id->fd_close != 0)
526 volume_id_free_buffer(id);