f0a75d274a
ZFS file system was ported from OpenSolaris operating system. The code in under CDDL license. I'd like to thank all SUN developers that created this great piece of software. Supported by: Wheel LTD (http://www.wheel.pl/) Supported by: The FreeBSD Foundation (http://www.freebsdfoundation.org/) Supported by: Sentex (http://www.sentex.net/)
288 lines
6.3 KiB
C
288 lines
6.3 KiB
C
/*
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* CDDL HEADER START
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*
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* The contents of this file are subject to the terms of the
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* Common Development and Distribution License (the "License").
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* You may not use this file except in compliance with the License.
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*
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* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
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* or http://www.opensolaris.org/os/licensing.
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* See the License for the specific language governing permissions
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* and limitations under the License.
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*
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* When distributing Covered Code, include this CDDL HEADER in each
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* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
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* If applicable, add the following below this CDDL HEADER, with the
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* fields enclosed by brackets "[]" replaced with your own identifying
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* information: Portions Copyright [yyyy] [name of copyright owner]
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*
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* CDDL HEADER END
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*/
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/*
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* Copyright 2007 Sun Microsystems, Inc. All rights reserved.
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* Use is subject to license terms.
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*/
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#pragma ident "%Z%%M% %I% %E% SMI"
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/*
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* Common name validation routines for ZFS. These routines are shared by the
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* userland code as well as the ioctl() layer to ensure that we don't
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* inadvertently expose a hole through direct ioctl()s that never gets tested.
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* In userland, however, we want significantly more information about _why_ the
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* name is invalid. In the kernel, we only care whether it's valid or not.
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* Each routine therefore takes a 'namecheck_err_t' which describes exactly why
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* the name failed to validate.
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*
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* Each function returns 0 on success, -1 on error.
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*/
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#if defined(_KERNEL)
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#include <sys/systm.h>
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#else
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#include <string.h>
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#endif
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#include <sys/param.h>
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#include "zfs_namecheck.h"
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static int
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valid_char(char c)
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{
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return ((c >= 'a' && c <= 'z') ||
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(c >= 'A' && c <= 'Z') ||
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(c >= '0' && c <= '9') ||
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c == '-' || c == '_' || c == '.' || c == ':');
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}
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/*
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* Snapshot names must be made up of alphanumeric characters plus the following
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* characters:
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*
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* [-_.:]
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*/
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int
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snapshot_namecheck(const char *path, namecheck_err_t *why, char *what)
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{
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const char *loc;
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if (strlen(path) >= MAXNAMELEN) {
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if (why)
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*why = NAME_ERR_TOOLONG;
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return (-1);
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}
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if (path[0] == '\0') {
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if (why)
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*why = NAME_ERR_EMPTY_COMPONENT;
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return (-1);
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}
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for (loc = path; *loc; loc++) {
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if (!valid_char(*loc)) {
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if (why) {
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*why = NAME_ERR_INVALCHAR;
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*what = *loc;
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}
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return (-1);
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}
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}
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return (0);
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}
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/*
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* Dataset names must be of the following form:
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*
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* [component][/]*[component][@component]
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*
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* Where each component is made up of alphanumeric characters plus the following
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* characters:
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*
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* [-_.:]
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*/
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int
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dataset_namecheck(const char *path, namecheck_err_t *why, char *what)
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{
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const char *loc, *end;
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int found_snapshot;
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/*
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* Make sure the name is not too long.
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*
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* ZFS_MAXNAMELEN is the maximum dataset length used in the userland
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* which is the same as MAXNAMELEN used in the kernel.
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* If ZFS_MAXNAMELEN value is changed, make sure to cleanup all
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* places using MAXNAMELEN.
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*/
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if (strlen(path) >= MAXNAMELEN) {
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if (why)
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*why = NAME_ERR_TOOLONG;
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return (-1);
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}
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/* Explicitly check for a leading slash. */
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if (path[0] == '/') {
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if (why)
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*why = NAME_ERR_LEADING_SLASH;
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return (-1);
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}
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if (path[0] == '\0') {
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if (why)
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*why = NAME_ERR_EMPTY_COMPONENT;
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return (-1);
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}
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loc = path;
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found_snapshot = 0;
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for (;;) {
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/* Find the end of this component */
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end = loc;
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while (*end != '/' && *end != '@' && *end != '\0')
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end++;
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if (*end == '\0' && end[-1] == '/') {
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/* trailing slashes are not allowed */
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if (why)
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*why = NAME_ERR_TRAILING_SLASH;
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return (-1);
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}
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/* Zero-length components are not allowed */
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if (loc == end) {
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if (why) {
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/*
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* Make sure this is really a zero-length
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* component and not a '@@'.
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*/
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if (*end == '@' && found_snapshot) {
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*why = NAME_ERR_MULTIPLE_AT;
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} else {
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*why = NAME_ERR_EMPTY_COMPONENT;
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}
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}
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return (-1);
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}
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/* Validate the contents of this component */
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while (loc != end) {
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if (!valid_char(*loc)) {
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if (why) {
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*why = NAME_ERR_INVALCHAR;
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*what = *loc;
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}
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return (-1);
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}
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loc++;
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}
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/* If we've reached the end of the string, we're OK */
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if (*end == '\0')
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return (0);
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if (*end == '@') {
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/*
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* If we've found an @ symbol, indicate that we're in
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* the snapshot component, and report a second '@'
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* character as an error.
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*/
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if (found_snapshot) {
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if (why)
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*why = NAME_ERR_MULTIPLE_AT;
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return (-1);
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}
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found_snapshot = 1;
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}
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/*
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* If there is a '/' in a snapshot name
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* then report an error
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*/
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if (*end == '/' && found_snapshot) {
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if (why)
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*why = NAME_ERR_TRAILING_SLASH;
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return (-1);
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}
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/* Update to the next component */
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loc = end + 1;
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}
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}
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/*
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* For pool names, we have the same set of valid characters as described in
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* dataset names, with the additional restriction that the pool name must begin
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* with a letter. The pool names 'raidz' and 'mirror' are also reserved names
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* that cannot be used.
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*/
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int
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pool_namecheck(const char *pool, namecheck_err_t *why, char *what)
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{
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const char *c;
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/*
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* Make sure the name is not too long.
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*
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* ZPOOL_MAXNAMELEN is the maximum pool length used in the userland
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* which is the same as MAXNAMELEN used in the kernel.
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* If ZPOOL_MAXNAMELEN value is changed, make sure to cleanup all
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* places using MAXNAMELEN.
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*/
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if (strlen(pool) >= MAXNAMELEN) {
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if (why)
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*why = NAME_ERR_TOOLONG;
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return (-1);
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}
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c = pool;
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while (*c != '\0') {
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if (!valid_char(*c)) {
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if (why) {
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*why = NAME_ERR_INVALCHAR;
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*what = *c;
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}
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return (-1);
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}
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c++;
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}
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if (!(*pool >= 'a' && *pool <= 'z') &&
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!(*pool >= 'A' && *pool <= 'Z')) {
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if (why)
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*why = NAME_ERR_NOLETTER;
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return (-1);
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}
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if (strcmp(pool, "mirror") == 0 || strcmp(pool, "raidz") == 0) {
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if (why)
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*why = NAME_ERR_RESERVED;
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return (-1);
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}
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if (pool[0] == 'c' && (pool[1] >= '0' && pool[1] <= '9')) {
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if (why)
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*why = NAME_ERR_DISKLIKE;
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return (-1);
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}
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return (0);
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}
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/*
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* Check if the dataset name is private for internal usage.
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* '$' is reserved for internal dataset names. e.g. "$MOS"
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*
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* Return 1 if the given name is used internally.
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* Return 0 if it is not.
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*/
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int
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dataset_name_hidden(const char *name)
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{
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if (strchr(name, '$') != NULL)
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return (1);
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return (0);
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}
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