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/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License (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 (c) 1994, 2010, Oracle and/or its affiliates. All rights reserved.
*/
/* Copyright (c) 1983, 1984, 1985, 1986, 1987, 1988, 1989 AT&T */
/* All Rights Reserved */
/*
* Portions of this source code were derived from Berkeley 4.3 BSD
* under license from the Regents of the University of California.
*/
#include <sys/param.h>
#include <sys/isa_defs.h>
#include <sys/types.h>
#include <sys/sysmacros.h>
#include <sys/systm.h>
#include <sys/errno.h>
#include <sys/pathname.h>
#include <sys/vfs.h>
#include <sys/vnode.h>
#include <sys/file.h>
#include <sys/fcntl.h>
#include <sys/proc.h>
#include <sys/uio.h>
#include <sys/debug.h>
#include <c2/audit.h>
#include <fs/fs_subr.h>
/*
* Create a symbolic link. Similar to link or rename except target
* name is passed as string argument, not converted to vnode reference.
*/
int
symlinkat(char *target, int dfd, char *linkname)
{
vnode_t *startvp;
vnode_t *dvp;
struct vattr vattr;
struct pathname lpn;
char *tbuf;
size_t tlen;
int error;
int estale_retry = 0;
int auditing = AU_AUDITING();
if (linkname == NULL)
return (set_errno(EFAULT));
if ((error = fgetstartvp(dfd, linkname, &startvp)) != 0)
return (set_errno(error));
top:
if (error = pn_get(linkname, UIO_USERSPACE, &lpn))
goto out;
if (auditing && startvp != NULL)
audit_setfsat_path(2);
if (error = lookuppnat(&lpn, NULL, NO_FOLLOW, &dvp, NULLVPP, startvp)) {
pn_free(&lpn);
if (error == ESTALE && fs_need_estale_retry(estale_retry++))
goto top;
goto out;
}
if (vn_is_readonly(dvp))
error = EROFS;
else if (pn_fixslash(&lpn))
error = ENOTDIR;
else {
tbuf = kmem_alloc(MAXPATHLEN, KM_SLEEP);
if ((error = copyinstr(target, tbuf, MAXPATHLEN, &tlen)) == 0) {
vattr.va_type = VLNK;
vattr.va_mode = 0777;
vattr.va_mask = AT_TYPE|AT_MODE;
error = VOP_SYMLINK(dvp, lpn.pn_path, &vattr,
tbuf, CRED(), NULL, 0);
if (auditing)
audit_symlink_create(dvp, lpn.pn_path,
tbuf, error);
}
kmem_free(tbuf, MAXPATHLEN);
}
pn_free(&lpn);
VN_RELE(dvp);
if (error == ESTALE && fs_need_estale_retry(estale_retry++))
goto top;
out:
if (startvp != NULL)
VN_RELE(startvp);
if (error)
return (set_errno(error));
return (0);
}
int
symlink(char *target, char *linkname)
{
return (symlinkat(target, AT_FDCWD, linkname));
}
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