mirror of
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208 lines
3.9 KiB
C
208 lines
3.9 KiB
C
/*
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* Copyright (C) 2001-2004 Sistina Software, Inc. All rights reserved.
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* Copyright (C) 2004-2006 Red Hat, Inc. All rights reserved.
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*
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* This file is part of LVM2.
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*
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* This copyrighted material is made available to anyone wishing to use,
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* modify, copy, or redistribute it subject to the terms and conditions
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* of the GNU Lesser General Public License v.2.1.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with this program; if not, write to the Free Software Foundation,
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* Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include "lib.h"
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#include "uuid.h"
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#include "lvm-wrappers.h"
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#include <assert.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#include <unistd.h>
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#include <ctype.h>
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static const char _c[] =
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"0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ!#";
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static int _built_inverse;
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static char _inverse_c[256];
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int lvid_create(union lvid *lvid, struct id *vgid)
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{
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memcpy(lvid->id, vgid, sizeof(*lvid->id));
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return id_create(&lvid->id[1]);
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}
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void uuid_from_num(char *uuid, uint32_t num)
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{
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unsigned i;
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for (i = ID_LEN; i; i--) {
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uuid[i - 1] = _c[num % (sizeof(_c) - 1)];
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num /= sizeof(_c) - 1;
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}
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}
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int lvid_from_lvnum(union lvid *lvid, struct id *vgid, uint32_t lv_num)
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{
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int i;
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memcpy(lvid->id, vgid, sizeof(*lvid->id));
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for (i = ID_LEN; i; i--) {
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lvid->id[1].uuid[i - 1] = _c[lv_num % (sizeof(_c) - 1)];
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lv_num /= sizeof(_c) - 1;
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}
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lvid->s[sizeof(lvid->s) - 1] = '\0';
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return 1;
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}
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int lvnum_from_lvid(union lvid *lvid)
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{
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int i, lv_num = 0;
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char *c;
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for (i = 0; i < ID_LEN; i++) {
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lv_num *= sizeof(_c) - 1;
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if ((c = strchr(_c, lvid->id[1].uuid[i])))
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lv_num += (int) (c - _c);
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if (lv_num < 0)
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lv_num = 0;
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}
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return lv_num;
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}
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int lvid_in_restricted_range(union lvid *lvid)
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{
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int i;
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for (i = 0; i < ID_LEN - 3; i++)
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if (lvid->id[1].uuid[i] != '0')
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return 0;
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for (i = ID_LEN - 3; i < ID_LEN; i++)
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if (!isdigit(lvid->id[1].uuid[i]))
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return 0;
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return 1;
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}
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int id_create(struct id *id)
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{
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unsigned i;
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size_t len = sizeof(id->uuid);
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memset(id->uuid, 0, len);
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if (!read_urandom(&id->uuid, len)) {
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return 0;
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}
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/*
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* Skip out the last 2 chars in randomized creation for LVM1
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* backwards compatibility.
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*/
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for (i = 0; i < len; i++)
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id->uuid[i] = _c[id->uuid[i] % (sizeof(_c) - 3)];
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return 1;
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}
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/*
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* The only validity check we have is that
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* the uuid just contains characters from
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* '_c'. A checksum would have been nice :(
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*/
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static void _build_inverse(void)
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{
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const char *ptr;
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if (_built_inverse)
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return;
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memset(_inverse_c, 0, sizeof(_inverse_c));
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for (ptr = _c; *ptr; ptr++)
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_inverse_c[(int) *ptr] = (char) 0x1;
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}
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int id_valid(struct id *id)
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{
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int i;
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_build_inverse();
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for (i = 0; i < ID_LEN; i++)
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if (!_inverse_c[id->uuid[i]]) {
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log_err("UUID contains invalid character");
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return 0;
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}
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return 1;
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}
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int id_equal(const struct id *lhs, const struct id *rhs)
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{
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return !memcmp(lhs->uuid, rhs->uuid, sizeof(lhs->uuid));
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}
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#define GROUPS (ID_LEN / 4)
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int id_write_format(const struct id *id, char *buffer, size_t size)
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{
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int i, tot;
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static unsigned group_size[] = { 6, 4, 4, 4, 4, 4, 6 };
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assert(ID_LEN == 32);
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/* split into groups separated by dashes */
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if (size < (32 + 6 + 1)) {
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log_err("Couldn't write uuid, buffer too small.");
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return 0;
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}
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for (i = 0, tot = 0; i < 7; i++) {
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memcpy(buffer, id->uuid + tot, group_size[i]);
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buffer += group_size[i];
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tot += group_size[i];
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*buffer++ = '-';
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}
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*--buffer = '\0';
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return 1;
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}
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int id_read_format(struct id *id, const char *buffer)
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{
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int out = 0;
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/* just strip out any dashes */
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while (*buffer) {
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if (*buffer == '-') {
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buffer++;
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continue;
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}
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if (out >= ID_LEN) {
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log_err("Too many characters to be uuid.");
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return 0;
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}
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id->uuid[out++] = *buffer++;
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}
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if (out != ID_LEN) {
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log_err("Couldn't read uuid, incorrect number of characters.");
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return 0;
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}
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return id_valid(id);
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}
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