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/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License, Version 1.0 only
* (the "License"). You may not use this file except in compliance
* with the License.
*
* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
* or http://www.opensolaris.org/os/licensing.
* See the License for the specific language governing permissions
* and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each
* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
* If applicable, add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your own identifying
* information: Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*/
/*
* Copyright 2005 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*/
#pragma ident "%Z%%M% %I% %E% SMI"
/*
* Common name validation routines for ZFS. These routines are shared by the
* userland code as well as the ioctl() layer to ensure that we don't
* inadvertently expose a hole through direct ioctl()s that never gets tested.
* In userland, however, we want significantly more information about _why_ the
* name is invalid. In the kernel, we only care whether it's valid or not.
* Each routine therefore takes a 'namecheck_err_t' which describes exactly why
* the name failed to validate.
*
* Each function returns 0 on success, -1 on error.
*/
#if defined(_KERNEL)
#include <sys/systm.h>
#else
#include <string.h>
#endif
#include "zfs_namecheck.h"
static int
valid_char(char c)
{
return ((c >= 'a' && c <= 'z') ||
(c >= 'A' && c <= 'Z') ||
(c >= '0' && c <= '9') ||
c == '-' || c == '_' || c == '.' || c == ':');
}
/*
* Dataset names must be of the following form:
*
* [component][/]*[component][@component]
*
* Where each component is made up of alphanumeric characters plus the following
* characters:
*
* [-_.:]
*/
int
dataset_namecheck(const char *path, namecheck_err_t *why, char *what)
{
const char *loc, *end;
int found_snapshot;
/* Explicitly check for a leading slash. */
if (path[0] == '/') {
if (why)
*why = NAME_ERR_LEADING_SLASH;
return (-1);
}
if (path[0] == '\0') {
if (why)
*why = NAME_ERR_EMPTY_COMPONENT;
return (-1);
}
loc = path;
found_snapshot = 0;
for (;;) {
/* Find the end of this component */
end = loc;
while (*end != '/' && *end != '@' && *end != '\0')
end++;
if (*end == '\0' && end[-1] == '/') {
/* trailing slashes are not allowed */
if (why)
*why = NAME_ERR_TRAILING_SLASH;
return (-1);
}
/* Zero-length components are not allowed */
if (loc == end) {
if (why)
*why = NAME_ERR_EMPTY_COMPONENT;
return (-1);
}
/* Validate the contents of this component */
while (loc != end) {
if (!valid_char(*loc)) {
if (why) {
*why = NAME_ERR_INVALCHAR;
*what = *loc;
}
return (-1);
}
loc++;
}
/* If we've reached the end of the string, we're OK */
if (*end == '\0')
return (0);
if (*end == '@') {
/*
* If we've found an @ symbol, indicate that we're in
* the snapshot component, and report a second '@'
* character as an error.
*/
if (found_snapshot) {
if (why)
*why = NAME_ERR_MULTIPLE_AT;
return (-1);
}
found_snapshot = 1;
}
/* Update to the next component */
loc = end + 1;
}
}
/*
* For pool names, we have the same set of valid characters as described in
* dataset names, with the additional restriction that the pool name must begin
* with a letter. The pool names 'raidz' and 'mirror' are also reserved names
* that cannot be used.
*/
int
pool_namecheck(const char *pool, namecheck_err_t *why, char *what)
{
const char *c;
c = pool;
while (*c != '\0') {
if (!valid_char(*c)) {
if (why) {
*why = NAME_ERR_INVALCHAR;
*what = *c;
}
return (-1);
}
c++;
}
if (!(*pool >= 'a' && *pool <= 'z') &&
!(*pool >= 'A' && *pool <= 'Z')) {
if (why)
*why = NAME_ERR_NOLETTER;
return (-1);
}
if (strcmp(pool, "mirror") == 0 || strcmp(pool, "raidz") == 0) {
if (why)
*why = NAME_ERR_RESERVED;
return (-1);
}
if (pool[0] == 'c' && (pool[1] >= '0' && pool[1] <= '9')) {
if (why)
*why = NAME_ERR_DISKLIKE;
return (-1);
}
return (0);
}
/*
* Check if the dataset name is private for internal usage.
* '$' is reserved for internal dataset names. e.g. "$MOS"
*
* Return 1 if the given name is used internally.
* Return 0 if it is not.
*/
int
dataset_name_hidden(const char *name)
{
if (strchr(name, '$') != NULL)
return (1);
return (0);
}
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