common/zfs/zfs_namecheck.c

	zfs_namecheck.c revision f18faf3f3e5def85fdfff681617d227703ace2ad
fa9e4066f08beec538e775443c5be79dd423fcabahrens/*
fa9e4066f08beec538e775443c5be79dd423fcabahrens * CDDL HEADER START
fa9e4066f08beec538e775443c5be79dd423fcabahrens *
fa9e4066f08beec538e775443c5be79dd423fcabahrens * The contents of this file are subject to the terms of the
1d452cf5123cb6ac0a013a4dbd4dcceeb0da314dahrens * Common Development and Distribution License (the "License").
1d452cf5123cb6ac0a013a4dbd4dcceeb0da314dahrens * You may not use this file except in compliance with the License.
fa9e4066f08beec538e775443c5be79dd423fcabahrens *
fa9e4066f08beec538e775443c5be79dd423fcabahrens * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
fa9e4066f08beec538e775443c5be79dd423fcabahrens * or http://www.opensolaris.org/os/licensing.
fa9e4066f08beec538e775443c5be79dd423fcabahrens * See the License for the specific language governing permissions
fa9e4066f08beec538e775443c5be79dd423fcabahrens * and limitations under the License.
fa9e4066f08beec538e775443c5be79dd423fcabahrens *
fa9e4066f08beec538e775443c5be79dd423fcabahrens * When distributing Covered Code, include this CDDL HEADER in each
fa9e4066f08beec538e775443c5be79dd423fcabahrens * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
fa9e4066f08beec538e775443c5be79dd423fcabahrens * If applicable, add the following below this CDDL HEADER, with the
fa9e4066f08beec538e775443c5be79dd423fcabahrens * fields enclosed by brackets "[]" replaced with your own identifying
fa9e4066f08beec538e775443c5be79dd423fcabahrens * information: Portions Copyright [yyyy] [name of copyright owner]
fa9e4066f08beec538e775443c5be79dd423fcabahrens *
fa9e4066f08beec538e775443c5be79dd423fcabahrens * CDDL HEADER END
fa9e4066f08beec538e775443c5be79dd423fcabahrens */
fa9e4066f08beec538e775443c5be79dd423fcabahrens/*
adab9ada749ee4a83a53c1884ddf63987c57e7f6pd * Copyright 2007 Sun Microsystems, Inc.  All rights reserved.
fa9e4066f08beec538e775443c5be79dd423fcabahrens * Use is subject to license terms.
fa9e4066f08beec538e775443c5be79dd423fcabahrens */
fa9e4066f08beec538e775443c5be79dd423fcabahrens
fa9e4066f08beec538e775443c5be79dd423fcabahrens#pragma ident   "%Z%%M% %I% %E% SMI"
fa9e4066f08beec538e775443c5be79dd423fcabahrens
fa9e4066f08beec538e775443c5be79dd423fcabahrens/*
fa9e4066f08beec538e775443c5be79dd423fcabahrens * Common name validation routines for ZFS.  These routines are shared by the
fa9e4066f08beec538e775443c5be79dd423fcabahrens * userland code as well as the ioctl() layer to ensure that we don't
fa9e4066f08beec538e775443c5be79dd423fcabahrens * inadvertently expose a hole through direct ioctl()s that never gets tested.
fa9e4066f08beec538e775443c5be79dd423fcabahrens * In userland, however, we want significantly more information about _why_ the
fa9e4066f08beec538e775443c5be79dd423fcabahrens * name is invalid.  In the kernel, we only care whether it's valid or not.
fa9e4066f08beec538e775443c5be79dd423fcabahrens * Each routine therefore takes a 'namecheck_err_t' which describes exactly why
fa9e4066f08beec538e775443c5be79dd423fcabahrens * the name failed to validate.
fa9e4066f08beec538e775443c5be79dd423fcabahrens *
fa9e4066f08beec538e775443c5be79dd423fcabahrens * Each function returns 0 on success, -1 on error.
fa9e4066f08beec538e775443c5be79dd423fcabahrens */
fa9e4066f08beec538e775443c5be79dd423fcabahrens
fa9e4066f08beec538e775443c5be79dd423fcabahrens#if defined(_KERNEL)
fa9e4066f08beec538e775443c5be79dd423fcabahrens#include <sys/systm.h>
fa9e4066f08beec538e775443c5be79dd423fcabahrens#else
fa9e4066f08beec538e775443c5be79dd423fcabahrens#include <string.h>
fa9e4066f08beec538e775443c5be79dd423fcabahrens#endif
fa9e4066f08beec538e775443c5be79dd423fcabahrens
b81d61a68b235e0529ebadc18e14d9d1dd52a258lling#include <sys/param.h>
ecd6cf800b63704be73fb264c3f5b6e0dafc068dmarks#include <sys/nvpair.h>
fa9e4066f08beec538e775443c5be79dd423fcabahrens#include "zfs_namecheck.h"
ecd6cf800b63704be73fb264c3f5b6e0dafc068dmarks#include "zfs_deleg.h"
fa9e4066f08beec538e775443c5be79dd423fcabahrens
fa9e4066f08beec538e775443c5be79dd423fcabahrensstatic int
fa9e4066f08beec538e775443c5be79dd423fcabahrensvalid_char(char c)
fa9e4066f08beec538e775443c5be79dd423fcabahrens{
fa9e4066f08beec538e775443c5be79dd423fcabahrens    return ((c >= 'a' && c <= 'z') ||
fa9e4066f08beec538e775443c5be79dd423fcabahrens        (c >= 'A' && c <= 'Z') ||
fa9e4066f08beec538e775443c5be79dd423fcabahrens        (c >= '0' && c <= '9') ||
f18faf3f3e5def85fdfff681617d227703ace2adek        c == '-' || c == '_' || c == '.' || c == ':' || c == '%');
fa9e4066f08beec538e775443c5be79dd423fcabahrens}
fa9e4066f08beec538e775443c5be79dd423fcabahrens
1d452cf5123cb6ac0a013a4dbd4dcceeb0da314dahrens/*
1d452cf5123cb6ac0a013a4dbd4dcceeb0da314dahrens * Snapshot names must be made up of alphanumeric characters plus the following
1d452cf5123cb6ac0a013a4dbd4dcceeb0da314dahrens * characters:
1d452cf5123cb6ac0a013a4dbd4dcceeb0da314dahrens *
f18faf3f3e5def85fdfff681617d227703ace2adek *  [-_.:%]
1d452cf5123cb6ac0a013a4dbd4dcceeb0da314dahrens */
1d452cf5123cb6ac0a013a4dbd4dcceeb0da314dahrensint
1d452cf5123cb6ac0a013a4dbd4dcceeb0da314dahrenssnapshot_namecheck(const char *path, namecheck_err_t *why, char *what)
1d452cf5123cb6ac0a013a4dbd4dcceeb0da314dahrens{
1d452cf5123cb6ac0a013a4dbd4dcceeb0da314dahrens    const char *loc;
1d452cf5123cb6ac0a013a4dbd4dcceeb0da314dahrens
1d452cf5123cb6ac0a013a4dbd4dcceeb0da314dahrens    if (strlen(path) >= MAXNAMELEN) {
1d452cf5123cb6ac0a013a4dbd4dcceeb0da314dahrens        if (why)
1d452cf5123cb6ac0a013a4dbd4dcceeb0da314dahrens            *why = NAME_ERR_TOOLONG;
1d452cf5123cb6ac0a013a4dbd4dcceeb0da314dahrens        return (-1);
1d452cf5123cb6ac0a013a4dbd4dcceeb0da314dahrens    }
1d452cf5123cb6ac0a013a4dbd4dcceeb0da314dahrens
1d452cf5123cb6ac0a013a4dbd4dcceeb0da314dahrens    if (path[0] == '\0') {
1d452cf5123cb6ac0a013a4dbd4dcceeb0da314dahrens        if (why)
1d452cf5123cb6ac0a013a4dbd4dcceeb0da314dahrens            *why = NAME_ERR_EMPTY_COMPONENT;
1d452cf5123cb6ac0a013a4dbd4dcceeb0da314dahrens        return (-1);
1d452cf5123cb6ac0a013a4dbd4dcceeb0da314dahrens    }
1d452cf5123cb6ac0a013a4dbd4dcceeb0da314dahrens
1d452cf5123cb6ac0a013a4dbd4dcceeb0da314dahrens    for (loc = path; *loc; loc++) {
1d452cf5123cb6ac0a013a4dbd4dcceeb0da314dahrens        if (!valid_char(*loc)) {
1d452cf5123cb6ac0a013a4dbd4dcceeb0da314dahrens            if (why) {
1d452cf5123cb6ac0a013a4dbd4dcceeb0da314dahrens                *why = NAME_ERR_INVALCHAR;
1d452cf5123cb6ac0a013a4dbd4dcceeb0da314dahrens                *what = *loc;
1d452cf5123cb6ac0a013a4dbd4dcceeb0da314dahrens            }
1d452cf5123cb6ac0a013a4dbd4dcceeb0da314dahrens            return (-1);
1d452cf5123cb6ac0a013a4dbd4dcceeb0da314dahrens        }
1d452cf5123cb6ac0a013a4dbd4dcceeb0da314dahrens    }
1d452cf5123cb6ac0a013a4dbd4dcceeb0da314dahrens    return (0);
1d452cf5123cb6ac0a013a4dbd4dcceeb0da314dahrens}
1d452cf5123cb6ac0a013a4dbd4dcceeb0da314dahrens
ecd6cf800b63704be73fb264c3f5b6e0dafc068dmarks
ecd6cf800b63704be73fb264c3f5b6e0dafc068dmarks/*
ecd6cf800b63704be73fb264c3f5b6e0dafc068dmarks * Permissions set name must start with the letter '@' followed by the
ecd6cf800b63704be73fb264c3f5b6e0dafc068dmarks * same character restrictions as snapshot names, except that the name
ecd6cf800b63704be73fb264c3f5b6e0dafc068dmarks * cannot exceed 64 characters.
ecd6cf800b63704be73fb264c3f5b6e0dafc068dmarks */
ecd6cf800b63704be73fb264c3f5b6e0dafc068dmarksint
ecd6cf800b63704be73fb264c3f5b6e0dafc068dmarkspermset_namecheck(const char *path, namecheck_err_t *why, char *what)
ecd6cf800b63704be73fb264c3f5b6e0dafc068dmarks{
ecd6cf800b63704be73fb264c3f5b6e0dafc068dmarks    if (strlen(path) >= ZFS_PERMSET_MAXLEN) {
ecd6cf800b63704be73fb264c3f5b6e0dafc068dmarks        if (why)
ecd6cf800b63704be73fb264c3f5b6e0dafc068dmarks            *why = NAME_ERR_TOOLONG;
ecd6cf800b63704be73fb264c3f5b6e0dafc068dmarks        return (-1);
ecd6cf800b63704be73fb264c3f5b6e0dafc068dmarks    }
ecd6cf800b63704be73fb264c3f5b6e0dafc068dmarks
ecd6cf800b63704be73fb264c3f5b6e0dafc068dmarks    if (path[0] != '@') {
ecd6cf800b63704be73fb264c3f5b6e0dafc068dmarks        if (why) {
ecd6cf800b63704be73fb264c3f5b6e0dafc068dmarks            *why = NAME_ERR_NO_AT;
ecd6cf800b63704be73fb264c3f5b6e0dafc068dmarks            *what = path[0];
ecd6cf800b63704be73fb264c3f5b6e0dafc068dmarks        }
ecd6cf800b63704be73fb264c3f5b6e0dafc068dmarks        return (-1);
ecd6cf800b63704be73fb264c3f5b6e0dafc068dmarks    }
ecd6cf800b63704be73fb264c3f5b6e0dafc068dmarks
ecd6cf800b63704be73fb264c3f5b6e0dafc068dmarks    return (snapshot_namecheck(&path[1], why, what));
ecd6cf800b63704be73fb264c3f5b6e0dafc068dmarks}
ecd6cf800b63704be73fb264c3f5b6e0dafc068dmarks
fa9e4066f08beec538e775443c5be79dd423fcabahrens/*
fa9e4066f08beec538e775443c5be79dd423fcabahrens * Dataset names must be of the following form:
fa9e4066f08beec538e775443c5be79dd423fcabahrens *
fa9e4066f08beec538e775443c5be79dd423fcabahrens *  [component][/]*[component][@component]
fa9e4066f08beec538e775443c5be79dd423fcabahrens *
fa9e4066f08beec538e775443c5be79dd423fcabahrens * Where each component is made up of alphanumeric characters plus the following
fa9e4066f08beec538e775443c5be79dd423fcabahrens * characters:
fa9e4066f08beec538e775443c5be79dd423fcabahrens *
f18faf3f3e5def85fdfff681617d227703ace2adek *  [-_.:%]
fa9e4066f08beec538e775443c5be79dd423fcabahrens */
fa9e4066f08beec538e775443c5be79dd423fcabahrensint
fa9e4066f08beec538e775443c5be79dd423fcabahrensdataset_namecheck(const char *path, namecheck_err_t *why, char *what)
fa9e4066f08beec538e775443c5be79dd423fcabahrens{
fa9e4066f08beec538e775443c5be79dd423fcabahrens    const char *loc, *end;
fa9e4066f08beec538e775443c5be79dd423fcabahrens    int found_snapshot;
fa9e4066f08beec538e775443c5be79dd423fcabahrens
b81d61a68b235e0529ebadc18e14d9d1dd52a258lling    /*
b81d61a68b235e0529ebadc18e14d9d1dd52a258lling     * Make sure the name is not too long.
b81d61a68b235e0529ebadc18e14d9d1dd52a258lling     *
b81d61a68b235e0529ebadc18e14d9d1dd52a258lling     * ZFS_MAXNAMELEN is the maximum dataset length used in the userland
b81d61a68b235e0529ebadc18e14d9d1dd52a258lling     * which is the same as MAXNAMELEN used in the kernel.
b81d61a68b235e0529ebadc18e14d9d1dd52a258lling     * If ZFS_MAXNAMELEN value is changed, make sure to cleanup all
b81d61a68b235e0529ebadc18e14d9d1dd52a258lling     * places using MAXNAMELEN.
b81d61a68b235e0529ebadc18e14d9d1dd52a258lling     */
ecd6cf800b63704be73fb264c3f5b6e0dafc068dmarks
b81d61a68b235e0529ebadc18e14d9d1dd52a258lling    if (strlen(path) >= MAXNAMELEN) {
b81d61a68b235e0529ebadc18e14d9d1dd52a258lling        if (why)
b81d61a68b235e0529ebadc18e14d9d1dd52a258lling            *why = NAME_ERR_TOOLONG;
b81d61a68b235e0529ebadc18e14d9d1dd52a258lling        return (-1);
b81d61a68b235e0529ebadc18e14d9d1dd52a258lling    }
b81d61a68b235e0529ebadc18e14d9d1dd52a258lling
fa9e4066f08beec538e775443c5be79dd423fcabahrens    /* Explicitly check for a leading slash.  */
fa9e4066f08beec538e775443c5be79dd423fcabahrens    if (path[0] == '/') {
fa9e4066f08beec538e775443c5be79dd423fcabahrens        if (why)
fa9e4066f08beec538e775443c5be79dd423fcabahrens            *why = NAME_ERR_LEADING_SLASH;
fa9e4066f08beec538e775443c5be79dd423fcabahrens        return (-1);
fa9e4066f08beec538e775443c5be79dd423fcabahrens    }
fa9e4066f08beec538e775443c5be79dd423fcabahrens
fa9e4066f08beec538e775443c5be79dd423fcabahrens    if (path[0] == '\0') {
fa9e4066f08beec538e775443c5be79dd423fcabahrens        if (why)
fa9e4066f08beec538e775443c5be79dd423fcabahrens            *why = NAME_ERR_EMPTY_COMPONENT;
fa9e4066f08beec538e775443c5be79dd423fcabahrens        return (-1);
fa9e4066f08beec538e775443c5be79dd423fcabahrens    }
fa9e4066f08beec538e775443c5be79dd423fcabahrens
fa9e4066f08beec538e775443c5be79dd423fcabahrens    loc = path;
fa9e4066f08beec538e775443c5be79dd423fcabahrens    found_snapshot = 0;
fa9e4066f08beec538e775443c5be79dd423fcabahrens    for (;;) {
fa9e4066f08beec538e775443c5be79dd423fcabahrens        /* Find the end of this component */
fa9e4066f08beec538e775443c5be79dd423fcabahrens        end = loc;
fa9e4066f08beec538e775443c5be79dd423fcabahrens        while (*end != '/' && *end != '@' && *end != '\0')
fa9e4066f08beec538e775443c5be79dd423fcabahrens            end++;
fa9e4066f08beec538e775443c5be79dd423fcabahrens
fa9e4066f08beec538e775443c5be79dd423fcabahrens        if (*end == '\0' && end[-1] == '/') {
fa9e4066f08beec538e775443c5be79dd423fcabahrens            /* trailing slashes are not allowed */
fa9e4066f08beec538e775443c5be79dd423fcabahrens            if (why)
fa9e4066f08beec538e775443c5be79dd423fcabahrens                *why = NAME_ERR_TRAILING_SLASH;
fa9e4066f08beec538e775443c5be79dd423fcabahrens            return (-1);
fa9e4066f08beec538e775443c5be79dd423fcabahrens        }
fa9e4066f08beec538e775443c5be79dd423fcabahrens
fa9e4066f08beec538e775443c5be79dd423fcabahrens        /* Zero-length components are not allowed */
adab9ada749ee4a83a53c1884ddf63987c57e7f6pd        if (loc == end) {
adab9ada749ee4a83a53c1884ddf63987c57e7f6pd            if (why) {
adab9ada749ee4a83a53c1884ddf63987c57e7f6pd                /*
adab9ada749ee4a83a53c1884ddf63987c57e7f6pd                 * Make sure this is really a zero-length
adab9ada749ee4a83a53c1884ddf63987c57e7f6pd                 * component and not a '@@'.
adab9ada749ee4a83a53c1884ddf63987c57e7f6pd                 */
adab9ada749ee4a83a53c1884ddf63987c57e7f6pd                if (*end == '@' && found_snapshot) {
adab9ada749ee4a83a53c1884ddf63987c57e7f6pd                    *why = NAME_ERR_MULTIPLE_AT;
adab9ada749ee4a83a53c1884ddf63987c57e7f6pd                } else {
adab9ada749ee4a83a53c1884ddf63987c57e7f6pd                    *why = NAME_ERR_EMPTY_COMPONENT;
adab9ada749ee4a83a53c1884ddf63987c57e7f6pd                }
adab9ada749ee4a83a53c1884ddf63987c57e7f6pd            }
adab9ada749ee4a83a53c1884ddf63987c57e7f6pd
fa9e4066f08beec538e775443c5be79dd423fcabahrens            return (-1);
fa9e4066f08beec538e775443c5be79dd423fcabahrens        }
fa9e4066f08beec538e775443c5be79dd423fcabahrens
fa9e4066f08beec538e775443c5be79dd423fcabahrens        /* Validate the contents of this component */
fa9e4066f08beec538e775443c5be79dd423fcabahrens        while (loc != end) {
fa9e4066f08beec538e775443c5be79dd423fcabahrens            if (!valid_char(*loc)) {
fa9e4066f08beec538e775443c5be79dd423fcabahrens                if (why) {
fa9e4066f08beec538e775443c5be79dd423fcabahrens                    *why = NAME_ERR_INVALCHAR;
fa9e4066f08beec538e775443c5be79dd423fcabahrens                    *what = *loc;
fa9e4066f08beec538e775443c5be79dd423fcabahrens                }
fa9e4066f08beec538e775443c5be79dd423fcabahrens                return (-1);
fa9e4066f08beec538e775443c5be79dd423fcabahrens            }
fa9e4066f08beec538e775443c5be79dd423fcabahrens            loc++;
fa9e4066f08beec538e775443c5be79dd423fcabahrens        }
fa9e4066f08beec538e775443c5be79dd423fcabahrens
fa9e4066f08beec538e775443c5be79dd423fcabahrens        /* If we've reached the end of the string, we're OK */
fa9e4066f08beec538e775443c5be79dd423fcabahrens        if (*end == '\0')
fa9e4066f08beec538e775443c5be79dd423fcabahrens            return (0);
fa9e4066f08beec538e775443c5be79dd423fcabahrens
fa9e4066f08beec538e775443c5be79dd423fcabahrens        if (*end == '@') {
fa9e4066f08beec538e775443c5be79dd423fcabahrens            /*
fa9e4066f08beec538e775443c5be79dd423fcabahrens             * If we've found an @ symbol, indicate that we're in
fa9e4066f08beec538e775443c5be79dd423fcabahrens             * the snapshot component, and report a second '@'
fa9e4066f08beec538e775443c5be79dd423fcabahrens             * character as an error.
fa9e4066f08beec538e775443c5be79dd423fcabahrens             */
fa9e4066f08beec538e775443c5be79dd423fcabahrens            if (found_snapshot) {
fa9e4066f08beec538e775443c5be79dd423fcabahrens                if (why)
fa9e4066f08beec538e775443c5be79dd423fcabahrens                    *why = NAME_ERR_MULTIPLE_AT;
fa9e4066f08beec538e775443c5be79dd423fcabahrens                return (-1);
fa9e4066f08beec538e775443c5be79dd423fcabahrens            }
fa9e4066f08beec538e775443c5be79dd423fcabahrens
fa9e4066f08beec538e775443c5be79dd423fcabahrens            found_snapshot = 1;
fa9e4066f08beec538e775443c5be79dd423fcabahrens        }
fa9e4066f08beec538e775443c5be79dd423fcabahrens
98579b20de8e05c5117968705a18979f8b75b863nd        /*
98579b20de8e05c5117968705a18979f8b75b863nd         * If there is a '/' in a snapshot name
98579b20de8e05c5117968705a18979f8b75b863nd         * then report an error
98579b20de8e05c5117968705a18979f8b75b863nd         */
98579b20de8e05c5117968705a18979f8b75b863nd        if (*end == '/' && found_snapshot) {
98579b20de8e05c5117968705a18979f8b75b863nd            if (why)
98579b20de8e05c5117968705a18979f8b75b863nd                *why = NAME_ERR_TRAILING_SLASH;
98579b20de8e05c5117968705a18979f8b75b863nd            return (-1);
98579b20de8e05c5117968705a18979f8b75b863nd        }
98579b20de8e05c5117968705a18979f8b75b863nd
fa9e4066f08beec538e775443c5be79dd423fcabahrens        /* Update to the next component */
fa9e4066f08beec538e775443c5be79dd423fcabahrens        loc = end + 1;
fa9e4066f08beec538e775443c5be79dd423fcabahrens    }
fa9e4066f08beec538e775443c5be79dd423fcabahrens}
fa9e4066f08beec538e775443c5be79dd423fcabahrens
89eef05efc3ad959ce1fcc4fbf4d428b4fc015adrm
89eef05efc3ad959ce1fcc4fbf4d428b4fc015adrm/*
89eef05efc3ad959ce1fcc4fbf4d428b4fc015adrm * mountpoint names must be of the following form:
89eef05efc3ad959ce1fcc4fbf4d428b4fc015adrm *
89eef05efc3ad959ce1fcc4fbf4d428b4fc015adrm *  /[component][/]*[component][/]
89eef05efc3ad959ce1fcc4fbf4d428b4fc015adrm */
89eef05efc3ad959ce1fcc4fbf4d428b4fc015adrmint
89eef05efc3ad959ce1fcc4fbf4d428b4fc015adrmmountpoint_namecheck(const char *path, namecheck_err_t *why)
89eef05efc3ad959ce1fcc4fbf4d428b4fc015adrm{
89eef05efc3ad959ce1fcc4fbf4d428b4fc015adrm    const char *start, *end;
89eef05efc3ad959ce1fcc4fbf4d428b4fc015adrm
89eef05efc3ad959ce1fcc4fbf4d428b4fc015adrm    /*
89eef05efc3ad959ce1fcc4fbf4d428b4fc015adrm     * Make sure none of the mountpoint component names are too long.
89eef05efc3ad959ce1fcc4fbf4d428b4fc015adrm     * If a component name is too long then the mkdir of the mountpoint
89eef05efc3ad959ce1fcc4fbf4d428b4fc015adrm     * will fail but then the mountpoint property will be set to a value
89eef05efc3ad959ce1fcc4fbf4d428b4fc015adrm     * that can never be mounted.  Better to fail before setting the prop.
89eef05efc3ad959ce1fcc4fbf4d428b4fc015adrm     * Extra slashes are OK, they will be tossed by the mountpoint mkdir.
89eef05efc3ad959ce1fcc4fbf4d428b4fc015adrm     */
89eef05efc3ad959ce1fcc4fbf4d428b4fc015adrm
89eef05efc3ad959ce1fcc4fbf4d428b4fc015adrm    if (path == NULL || *path != '/') {
89eef05efc3ad959ce1fcc4fbf4d428b4fc015adrm        if (why)
89eef05efc3ad959ce1fcc4fbf4d428b4fc015adrm            *why = NAME_ERR_LEADING_SLASH;
89eef05efc3ad959ce1fcc4fbf4d428b4fc015adrm        return (-1);
89eef05efc3ad959ce1fcc4fbf4d428b4fc015adrm    }
89eef05efc3ad959ce1fcc4fbf4d428b4fc015adrm
89eef05efc3ad959ce1fcc4fbf4d428b4fc015adrm    /* Skip leading slash  */
89eef05efc3ad959ce1fcc4fbf4d428b4fc015adrm    start = &path[1];
89eef05efc3ad959ce1fcc4fbf4d428b4fc015adrm    do {
89eef05efc3ad959ce1fcc4fbf4d428b4fc015adrm        end = start;
89eef05efc3ad959ce1fcc4fbf4d428b4fc015adrm        while (*end != '/' && *end != '\0')
89eef05efc3ad959ce1fcc4fbf4d428b4fc015adrm            end++;
89eef05efc3ad959ce1fcc4fbf4d428b4fc015adrm
89eef05efc3ad959ce1fcc4fbf4d428b4fc015adrm        if (end - start >= MAXNAMELEN) {
89eef05efc3ad959ce1fcc4fbf4d428b4fc015adrm            if (why)
89eef05efc3ad959ce1fcc4fbf4d428b4fc015adrm                *why = NAME_ERR_TOOLONG;
89eef05efc3ad959ce1fcc4fbf4d428b4fc015adrm            return (-1);
89eef05efc3ad959ce1fcc4fbf4d428b4fc015adrm        }
89eef05efc3ad959ce1fcc4fbf4d428b4fc015adrm        start = end + 1;
89eef05efc3ad959ce1fcc4fbf4d428b4fc015adrm
89eef05efc3ad959ce1fcc4fbf4d428b4fc015adrm    } while (*end != '\0');
89eef05efc3ad959ce1fcc4fbf4d428b4fc015adrm
89eef05efc3ad959ce1fcc4fbf4d428b4fc015adrm    return (0);
89eef05efc3ad959ce1fcc4fbf4d428b4fc015adrm}
89eef05efc3ad959ce1fcc4fbf4d428b4fc015adrm
fa9e4066f08beec538e775443c5be79dd423fcabahrens/*
fa9e4066f08beec538e775443c5be79dd423fcabahrens * For pool names, we have the same set of valid characters as described in
fa9e4066f08beec538e775443c5be79dd423fcabahrens * dataset names, with the additional restriction that the pool name must begin
fa9e4066f08beec538e775443c5be79dd423fcabahrens * with a letter.  The pool names 'raidz' and 'mirror' are also reserved names
fa9e4066f08beec538e775443c5be79dd423fcabahrens * that cannot be used.
fa9e4066f08beec538e775443c5be79dd423fcabahrens */
fa9e4066f08beec538e775443c5be79dd423fcabahrensint
fa9e4066f08beec538e775443c5be79dd423fcabahrenspool_namecheck(const char *pool, namecheck_err_t *why, char *what)
fa9e4066f08beec538e775443c5be79dd423fcabahrens{
fa9e4066f08beec538e775443c5be79dd423fcabahrens    const char *c;
fa9e4066f08beec538e775443c5be79dd423fcabahrens
b81d61a68b235e0529ebadc18e14d9d1dd52a258lling    /*
b81d61a68b235e0529ebadc18e14d9d1dd52a258lling     * Make sure the name is not too long.
b81d61a68b235e0529ebadc18e14d9d1dd52a258lling     *
b81d61a68b235e0529ebadc18e14d9d1dd52a258lling     * ZPOOL_MAXNAMELEN is the maximum pool length used in the userland
b81d61a68b235e0529ebadc18e14d9d1dd52a258lling     * which is the same as MAXNAMELEN used in the kernel.
b81d61a68b235e0529ebadc18e14d9d1dd52a258lling     * If ZPOOL_MAXNAMELEN value is changed, make sure to cleanup all
b81d61a68b235e0529ebadc18e14d9d1dd52a258lling     * places using MAXNAMELEN.
b81d61a68b235e0529ebadc18e14d9d1dd52a258lling     */
b81d61a68b235e0529ebadc18e14d9d1dd52a258lling    if (strlen(pool) >= MAXNAMELEN) {
b81d61a68b235e0529ebadc18e14d9d1dd52a258lling        if (why)
b81d61a68b235e0529ebadc18e14d9d1dd52a258lling            *why = NAME_ERR_TOOLONG;
b81d61a68b235e0529ebadc18e14d9d1dd52a258lling        return (-1);
b81d61a68b235e0529ebadc18e14d9d1dd52a258lling    }
b81d61a68b235e0529ebadc18e14d9d1dd52a258lling
fa9e4066f08beec538e775443c5be79dd423fcabahrens    c = pool;
fa9e4066f08beec538e775443c5be79dd423fcabahrens    while (*c != '\0') {
fa9e4066f08beec538e775443c5be79dd423fcabahrens        if (!valid_char(*c)) {
fa9e4066f08beec538e775443c5be79dd423fcabahrens            if (why) {
fa9e4066f08beec538e775443c5be79dd423fcabahrens                *why = NAME_ERR_INVALCHAR;
fa9e4066f08beec538e775443c5be79dd423fcabahrens                *what = *c;
fa9e4066f08beec538e775443c5be79dd423fcabahrens            }
fa9e4066f08beec538e775443c5be79dd423fcabahrens            return (-1);
fa9e4066f08beec538e775443c5be79dd423fcabahrens        }
fa9e4066f08beec538e775443c5be79dd423fcabahrens        c++;
fa9e4066f08beec538e775443c5be79dd423fcabahrens    }
fa9e4066f08beec538e775443c5be79dd423fcabahrens
fa9e4066f08beec538e775443c5be79dd423fcabahrens    if (!(*pool >= 'a' && *pool <= 'z') &&
fa9e4066f08beec538e775443c5be79dd423fcabahrens        !(*pool >= 'A' && *pool <= 'Z')) {
fa9e4066f08beec538e775443c5be79dd423fcabahrens        if (why)
fa9e4066f08beec538e775443c5be79dd423fcabahrens            *why = NAME_ERR_NOLETTER;
fa9e4066f08beec538e775443c5be79dd423fcabahrens        return (-1);
fa9e4066f08beec538e775443c5be79dd423fcabahrens    }
fa9e4066f08beec538e775443c5be79dd423fcabahrens
fa9e4066f08beec538e775443c5be79dd423fcabahrens    if (strcmp(pool, "mirror") == 0 || strcmp(pool, "raidz") == 0) {
fa9e4066f08beec538e775443c5be79dd423fcabahrens        if (why)
fa9e4066f08beec538e775443c5be79dd423fcabahrens            *why = NAME_ERR_RESERVED;
fa9e4066f08beec538e775443c5be79dd423fcabahrens        return (-1);
fa9e4066f08beec538e775443c5be79dd423fcabahrens    }
fa9e4066f08beec538e775443c5be79dd423fcabahrens
fa9e4066f08beec538e775443c5be79dd423fcabahrens    if (pool[0] == 'c' && (pool[1] >= '0' && pool[1] <= '9')) {
fa9e4066f08beec538e775443c5be79dd423fcabahrens        if (why)
fa9e4066f08beec538e775443c5be79dd423fcabahrens            *why = NAME_ERR_DISKLIKE;
fa9e4066f08beec538e775443c5be79dd423fcabahrens        return (-1);
fa9e4066f08beec538e775443c5be79dd423fcabahrens    }
fa9e4066f08beec538e775443c5be79dd423fcabahrens
fa9e4066f08beec538e775443c5be79dd423fcabahrens    return (0);
fa9e4066f08beec538e775443c5be79dd423fcabahrens}
fa9e4066f08beec538e775443c5be79dd423fcabahrens
fa9e4066f08beec538e775443c5be79dd423fcabahrens/*
fa9e4066f08beec538e775443c5be79dd423fcabahrens * Check if the dataset name is private for internal usage.
fa9e4066f08beec538e775443c5be79dd423fcabahrens * '$' is reserved for internal dataset names. e.g. "$MOS"
fa9e4066f08beec538e775443c5be79dd423fcabahrens *
fa9e4066f08beec538e775443c5be79dd423fcabahrens * Return 1 if the given name is used internally.
fa9e4066f08beec538e775443c5be79dd423fcabahrens * Return 0 if it is not.
fa9e4066f08beec538e775443c5be79dd423fcabahrens */
fa9e4066f08beec538e775443c5be79dd423fcabahrensint
fa9e4066f08beec538e775443c5be79dd423fcabahrensdataset_name_hidden(const char *name)
fa9e4066f08beec538e775443c5be79dd423fcabahrens{
fa9e4066f08beec538e775443c5be79dd423fcabahrens    if (strchr(name, '$') != NULL)
fa9e4066f08beec538e775443c5be79dd423fcabahrens        return (1);
fa9e4066f08beec538e775443c5be79dd423fcabahrens
fa9e4066f08beec538e775443c5be79dd423fcabahrens    return (0);
fa9e4066f08beec538e775443c5be79dd423fcabahrens}