volume_id.c revision 2603474ff9be2418900581da1af5cccc9f13cae1
/*
* volume_id - reads volume label and uuid
*
* Copyright (C) 2005-2007 Kay Sievers <kay.sievers@vrfy.org>
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation version 2 of the License.
*/
#ifndef _GNU_SOURCE
#define _GNU_SOURCE 1
#endif
#ifdef HAVE_CONFIG_H
# include <config.h>
#endif
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <errno.h>
#include <ctype.h>
#include <fcntl.h>
#include <sys/stat.h>
#include "libvolume_id.h"
#include "libvolume_id-private.h"
#include "util.h"
#define ARRAY_SIZE(x) (sizeof(x) / sizeof((x)[0]))
struct prober {
volume_id_probe_fn_t prober;
const char *name[4];
};
static const struct prober prober_raid[] = {
{ volume_id_probe_linux_raid, { "linux_raid", } },
{ volume_id_probe_ddf_raid, { "ddf_raid", } },
{ volume_id_probe_intel_software_raid, { "isw_raid", } },
{ volume_id_probe_lsi_mega_raid, { "lsi_mega_raid", } },
{ volume_id_probe_via_raid, { "via_raid", } },
{ volume_id_probe_silicon_medley_raid, { "silicon_medley_raid", } },
{ volume_id_probe_nvidia_raid, { "nvidia_raid", } },
{ volume_id_probe_promise_fasttrack_raid, { "promise_fasttrack_raid", } },
{ volume_id_probe_highpoint_45x_raid, { "highpoint_raid", } },
{ volume_id_probe_adaptec_raid, { "adaptec_raid", } },
{ volume_id_probe_jmicron_raid, { "jmicron_raid", } },
{ volume_id_probe_lvm1, { "lvm1", } },
{ volume_id_probe_lvm2, { "lvm2", } },
{ volume_id_probe_highpoint_37x_raid, { "highpoint_raid", } },
};
static const struct prober prober_filesystem[] = {
{ volume_id_probe_vfat, { "vfat", } },
{ volume_id_probe_linux_swap, { "swap", } },
{ volume_id_probe_luks, { "luks", } },
{ volume_id_probe_xfs, { "xfs", } },
{ volume_id_probe_ext, { "ext2", "ext3", "jbd", } },
{ volume_id_probe_reiserfs, { "reiserfs", "reiser4", } },
{ volume_id_probe_jfs, { "jfs", } },
{ volume_id_probe_udf, { "udf", } },
{ volume_id_probe_iso9660, { "iso9660", } },
{ volume_id_probe_hfs_hfsplus, { "hfs", "hfsplus", } },
{ volume_id_probe_ufs, { "ufs", } },
{ volume_id_probe_ntfs, { "ntfs", } },
{ volume_id_probe_cramfs, { "cramfs", } },
{ volume_id_probe_romfs, { "romfs", } },
{ volume_id_probe_hpfs, { "hpfs", } },
{ volume_id_probe_sysv, { "sysv", "xenix", } },
{ volume_id_probe_minix, { "minix", } },
{ volume_id_probe_gfs, { "gfs", } },
{ volume_id_probe_gfs2, { "gfs2", } },
{ volume_id_probe_ocfs1, { "ocfs1", } },
{ volume_id_probe_ocfs2, { "ocfs2", } },
{ volume_id_probe_vxfs, { "vxfs", } },
{ volume_id_probe_squashfs, { "squashfs", } },
{ volume_id_probe_netware, { "netware", } },
{ volume_id_probe_oracleasm, { "oracleasm", } },
};
/* the user can overwrite this log function */
static void default_log(int priority, const char *file, int line, const char *format, ...)
{
return;
}
volume_id_log_fn_t volume_id_log_fn = default_log;
/**
* volume_id_get_prober_by_type:
* @type: Type string.
*
* Lookup the probing function for a specific type.
*
* Returns: The probing function for the given type, #NULL otherwise.
**/
const volume_id_probe_fn_t *volume_id_get_prober_by_type(const char *type)
{
unsigned int p, n;
if (type == NULL)
return NULL;
for (p = 0; p < ARRAY_SIZE(prober_raid); p++)
for (n = 0; prober_raid[p].name[n] != NULL; n++)
if (strcmp(type, prober_raid[p].name[n]) == 0)
return &prober_raid[p].prober;
for (p = 0; p < ARRAY_SIZE(prober_filesystem); p++)
for (n = 0; prober_filesystem[p].name[n] != NULL; n++)
if (strcmp(type, prober_filesystem[p].name[n]) == 0)
return &prober_filesystem[p].prober;
return NULL;
}
/**
* volume_id_get_label:
* @id: Probing context.
* @label: Label string. Must not be freed by the caller.
*
* Get the label string after a successful probe. Unicode
* is translated to UTF-8.
*
* Returns: 1 if the value was set, 0 otherwise.
**/
int volume_id_get_label(struct volume_id *id, const char **label)
{
if (id == NULL)
return 0;
if (label == NULL)
return 0;
if (id->usage_id == VOLUME_ID_UNUSED)
return 0;
*label = id->label;
return 1;
}
/**
* volume_id_get_label_raw:
* @id: Probing context.
* @label: Label byte array. Must not be freed by the caller.
* @len: Length of raw label byte array.
*
* Get the raw label byte array after a successful probe. It may
* contain undecoded multibyte character streams.
*
* Returns: 1 if the value was set, 0 otherwise.
**/
int volume_id_get_label_raw(struct volume_id *id, const uint8_t **label, size_t *len)
{
if (id == NULL)
return 0;
if (label == NULL)
return 0;
if (len == NULL)
return 0;
if (id->usage_id == VOLUME_ID_UNUSED)
return 0;
*label = id->label_raw;
*len = id->label_raw_len;
return 1;
}
/**
* volume_id_get_uuid:
* @id: Probing context.
* @uuid: UUID string. Must not be freed by the caller.
*
* Get the raw UUID string after a successful probe.
*
* Returns: 1 if the value was set, 0 otherwise.
**/
int volume_id_get_uuid(struct volume_id *id, const char **uuid)
{
if (id == NULL)
return 0;
if (uuid == NULL)
return 0;
if (id->usage_id == VOLUME_ID_UNUSED)
return 0;
*uuid = id->uuid;
return 1;
}
/**
* volume_id_get_uuid_raw:
* @id: Probing context.
* @uuid: UUID byte array. Must not be freed by the caller.
* @len: Length of raw UUID byte array.
*
* Get the raw UUID byte array after a successful probe. It may
* contain unconverted endianes values.
*
* Returns: 1 if the value was set, 0 otherwise.
**/
int volume_id_get_uuid_raw(struct volume_id *id, const uint8_t **uuid, size_t *len)
{
if (id == NULL)
return 0;
if (uuid == NULL)
return 0;
if (len == NULL)
return 0;
if (id->usage_id == VOLUME_ID_UNUSED)
return 0;
*uuid = id->uuid_raw;
*len = id->uuid_raw_len;
return 1;
}
/**
* volume_id_get_usage:
* @id: Probing context.
* @usage: Usage string. Must not be freed by the caller.
*
* Get the usage string after a successful probe.
*
* Returns: 1 if the value was set, 0 otherwise.
**/
int volume_id_get_usage(struct volume_id *id, const char **usage)
{
if (id == NULL)
return 0;
if (usage == NULL)
return 0;
if (id->usage_id == VOLUME_ID_UNUSED)
return 0;
*usage = id->usage;
return 1;
}
/**
* volume_id_get_type:
* @id: Probing context
* @type: Type string. Must not be freed by the caller.
*
* Get the type string after a successful probe.
*
* Returns: 1 if the value was set, 0 otherwise.
**/
int volume_id_get_type(struct volume_id *id, const char **type)
{
if (id == NULL)
return 0;
if (type == NULL)
return 0;
if (id->usage_id == VOLUME_ID_UNUSED)
return 0;
*type = id->type;
return 1;
}
/**
* volume_id_get_type_version:
* @id: Probing context.
* @type_version: Type version string. Must not be freed by the caller.
*
* Get the Type version string after a successful probe.
*
* Returns: 1 if the value was set, 0 otherwise.
**/
int volume_id_get_type_version(struct volume_id *id, const char **type_version)
{
if (id == NULL)
return 0;
if (type_version == NULL)
return 0;
if (id->usage_id == VOLUME_ID_UNUSED)
return 0;
*type_version = id->type_version;
return 1;
}
static int needs_encoding(const char c)
{
if ((c >= '0' && c <= '9') ||
(c >= 'A' && c <= 'Z') ||
(c >= 'a' && c <= 'z') ||
strchr(ALLOWED_CHARS, c))
return 0;
return 1;
}
/**
* volume_id_encode_string:
* @str: Input string to be encoded.
* @str_enc: Target string to store the encoded input.
* @len: Location to store the encoded string. The target string,
* which may be four times as long as the input string.
*
* Encode all potentially unsafe characters of a string to the
* corresponding hex value prefixed by '\x'.
*
* Returns: 1 if the entire string was copied, 0 otherwise.
**/
int volume_id_encode_string(const char *str, char *str_enc, size_t len)
{
size_t i, j;
if (str == NULL || str_enc == NULL || len == 0)
return 0;
str_enc[0] = '\0';
for (i = 0, j = 0; str[i] != '\0'; i++) {
int seqlen;
seqlen = volume_id_utf8_encoded_valid_unichar(&str[i]);
if (seqlen > 1) {
memcpy(&str_enc[j], &str[i], seqlen);
j += seqlen;
i += (seqlen-1);
} else if (str[i] == '\\' || needs_encoding(str[i])) {
sprintf(&str_enc[j], "\\x%02x", (unsigned char) str[i]);
j += 4;
} else {
str_enc[j] = str[i];
j++;
}
if (j+3 >= len)
goto err;
}
str_enc[j] = '\0';
return 1;
err:
return 0;
}
/* run only once into a timeout for unreadable devices */
static int device_is_readable(struct volume_id *id, uint64_t off)
{
if (volume_id_get_buffer(id, off, 0x200) != NULL)
return 1;
return 0;
}
/**
* volume_id_probe_raid:
* @id: Probing context.
* @off: Probing offset relative to the start of the device.
* @size: Total size of the device.
*
* Probe device for all known raid signatures.
*
* Returns: 0 on successful probe, otherwise negative value.
**/
int volume_id_probe_raid(struct volume_id *id, uint64_t off, uint64_t size)
{
unsigned int i;
if (id == NULL)
return -EINVAL;
if (!device_is_readable(id, off))
return -1;
info("probing at offset 0x%llx, size 0x%llx\n",
(unsigned long long) off, (unsigned long long) size);
for (i = 0; i < ARRAY_SIZE(prober_raid); i++)
if (prober_raid[i].prober(id, off, size) == 0)
goto found;
return -1;
found:
/* If recognized, we free the allocated buffers */
volume_id_free_buffer(id);
return 0;
}
/**
* volume_id_probe_filesystem:
* @id: Probing context.
* @off: Probing offset relative to the start of the device.
* @size: Total size of the device.
*
* Probe device for all known filesystem signatures.
*
* Returns: 0 on successful probe, otherwise negative value.
**/
int volume_id_probe_filesystem(struct volume_id *id, uint64_t off, uint64_t size)
{
unsigned int i;
if (id == NULL)
return -EINVAL;
if (!device_is_readable(id, off))
return -1;
info("probing at offset 0x%llx, size 0x%llx\n",
(unsigned long long) off, (unsigned long long) size);
for (i = 0; i < ARRAY_SIZE(prober_filesystem); i++)
if (prober_filesystem[i].prober(id, off, size) == 0)
goto found;
return -1;
found:
/* If recognized, we free the allocated buffers */
volume_id_free_buffer(id);
return 0;
}
/**
* volume_id_probe_all:
* @id: Probing context.
* @off: Probing offset relative to the start of the device.
* @size: Total size of the device.
*
* Probe device for all known raid and filesystem signatures.
*
* Returns: 0 on successful probe, otherwise negative value.
**/
int volume_id_probe_all(struct volume_id *id, uint64_t off, uint64_t size)
{
if (id == NULL)
return -EINVAL;
if (!device_is_readable(id, off))
return -1;
/* probe for raid first, because fs probes may be successful on raid members */
if (volume_id_probe_raid(id, off, size) == 0)
return 0;
if (volume_id_probe_filesystem(id, off, size) == 0)
return 0;
return -1;
}
/**
* volume_id_probe_raid:
* @all_probers_fn: prober function to called for all known probing routines.
* @id: Context passed to prober function.
* @off: Offset value passed to prober function.
* @size: Size value passed to prober function.
* @data: Arbitrary data passed to the prober function.
*
* Run a custom function for all known probing routines.
**/
void volume_id_all_probers(all_probers_fn_t all_probers_fn,
struct volume_id *id, uint64_t off, uint64_t size,
void *data)
{
unsigned int i;
if (all_probers_fn == NULL)
return;
for (i = 0; i < ARRAY_SIZE(prober_raid); i++)
if (all_probers_fn(prober_raid[i].prober, id, off, size, data) != 0)
goto out;
for (i = 0; i < ARRAY_SIZE(prober_filesystem); i++)
if (all_probers_fn(prober_filesystem[i].prober, id, off, size, data) != 0)
goto out;
out:
return;
}
/**
* volume_id_open_fd:
* @id: Probing context.
* @fd: Open file descriptor of device to read from.
*
* Create the context for probing.
*
* Returns: Probing context, or #NULL on failure.
**/
struct volume_id *volume_id_open_fd(int fd)
{
struct volume_id *id;
id = malloc(sizeof(struct volume_id));
if (id == NULL)
return NULL;
memset(id, 0x00, sizeof(struct volume_id));
id->fd = fd;
return id;
}
/**
* volume_id_close:
* @id: Probing context.
*
* Release probing context and free all associated data.
*/
void volume_id_close(struct volume_id *id)
{
if (id == NULL)
return;
if (id->fd_close != 0)
close(id->fd);
volume_id_free_buffer(id);
free(id);
}