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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 2007 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*/
/* 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.
*/
#pragma ident "%Z%%M% %I% %E% SMI"
#include <sys/param.h>
#include <sys/isa_defs.h>
#include <sys/types.h>
#include <sys/sysmacros.h>
#include <sys/user.h>
#include <sys/systm.h>
#include <sys/errno.h>
#include <sys/fcntl.h>
#include <sys/stat.h>
#include <sys/vnode.h>
#include <sys/vfs.h>
#include <sys/file.h>
#include <sys/mode.h>
#include <sys/uio.h>
#include <sys/debug.h>
#include <c2/audit.h>
/*
* Common code for open()/openat() and creat(). Check permissions, allocate
* an open file structure, and call the device open routine (if any).
*/
static int
copen(int startfd, char *fname, int filemode, int createmode)
{
struct pathname pn;
vnode_t *vp, *sdvp;
file_t *fp, *startfp;
enum vtype type;
int error;
int fd, dupfd;
vnode_t *startvp;
proc_t *p = curproc;
if (startfd == AT_FDCWD) {
/*
* Regular open()
*/
startvp = NULL;
} else {
/*
* We're here via openat()
*/
char startchar;
if (copyin(fname, &startchar, sizeof (char)))
return (set_errno(EFAULT));
/*
* if startchar is / then startfd is ignored
*/
if (startchar == '/')
startvp = NULL;
else {
if ((startfp = getf(startfd)) == NULL)
return (set_errno(EBADF));
startvp = startfp->f_vnode;
VN_HOLD(startvp);
releasef(startfd);
}
}
if (filemode & FXATTR) {
/*
* Make sure we have a valid request.
* We must either have a real fd or AT_FDCWD
*/
if (startfd != AT_FDCWD && startvp == NULL) {
error = EINVAL;
goto out;
}
if (error = pn_get(fname, UIO_USERSPACE, &pn)) {
goto out;
}
if (startfd == AT_FDCWD) {
mutex_enter(&p->p_lock);
startvp = PTOU(p)->u_cdir;
VN_HOLD(startvp);
mutex_exit(&p->p_lock);
}
/*
* Verify permission to put attributes on file
*/
if ((VOP_ACCESS(startvp, VREAD, 0, CRED()) != 0) &&
(VOP_ACCESS(startvp, VWRITE, 0, CRED()) != 0) &&
(VOP_ACCESS(startvp, VEXEC, 0, CRED()) != 0)) {
error = EACCES;
pn_free(&pn);
goto out;
}
if ((startvp->v_vfsp->vfs_flag & VFS_XATTR) != 0) {
error = VOP_LOOKUP(startvp, "", &sdvp, &pn,
LOOKUP_XATTR|CREATE_XATTR_DIR, rootvp, CRED());
} else {
error = EINVAL;
}
pn_free(&pn);
if (error != 0)
goto out;
VN_RELE(startvp);
startvp = sdvp;
}
if ((filemode & (FREAD|FWRITE)) != 0) {
if ((filemode & (FNONBLOCK|FNDELAY)) == (FNONBLOCK|FNDELAY))
filemode &= ~FNDELAY;
error = falloc((vnode_t *)NULL, filemode, &fp, &fd);
if (error == 0) {
#ifdef C2_AUDIT
if (audit_active)
audit_setfsat_path(1);
#endif /* C2_AUDIT */
/*
* Last arg is a don't-care term if
* !(filemode & FCREAT).
*/
error = vn_openat(fname, UIO_USERSPACE, filemode,
(int)(createmode & MODEMASK), &vp, CRCREAT,
PTOU(curproc)->u_cmask, startvp);
if (startvp != NULL)
VN_RELE(startvp);
if (error == 0) {
#ifdef C2_AUDIT
if (audit_active)
audit_copen(fd, fp, vp);
#endif /* C2_AUDIT */
if ((vp->v_flag & VDUP) == 0) {
fp->f_vnode = vp;
mutex_exit(&fp->f_tlock);
/*
* We must now fill in the slot
* falloc reserved.
*/
setf(fd, fp);
return (fd);
} else {
/*
* Special handling for /dev/fd.
* Give up the file pointer
* and dup the indicated file descriptor
* (in v_rdev). This is ugly, but I've
* seen worse.
*/
unfalloc(fp);
dupfd = getminor(vp->v_rdev);
type = vp->v_type;
mutex_enter(&vp->v_lock);
vp->v_flag &= ~VDUP;
mutex_exit(&vp->v_lock);
VN_RELE(vp);
if (type != VCHR)
return (set_errno(EINVAL));
if ((fp = getf(dupfd)) == NULL) {
setf(fd, NULL);
return (set_errno(EBADF));
}
mutex_enter(&fp->f_tlock);
fp->f_count++;
mutex_exit(&fp->f_tlock);
setf(fd, fp);
releasef(dupfd);
}
return (fd);
} else {
setf(fd, NULL);
unfalloc(fp);
return (set_errno(error));
}
}
} else {
error = EINVAL;
}
out:
if (startvp != NULL)
VN_RELE(startvp);
return (set_errno(error));
}
#define OPENMODE32(fmode) ((int)((fmode)-FOPEN))
#define CREATMODE32 (FWRITE|FCREAT|FTRUNC)
#define OPENMODE64(fmode) (OPENMODE32(fmode) | FOFFMAX)
#define CREATMODE64 (CREATMODE32 | FOFFMAX)
#ifdef _LP64
#define OPENMODE(fmode) OPENMODE64(fmode)
#define CREATMODE CREATMODE64
#else
#define OPENMODE OPENMODE32
#define CREATMODE CREATMODE32
#endif
/*
* Open a file.
*/
int
open(char *fname, int fmode, int cmode)
{
return (copen(AT_FDCWD, fname, OPENMODE(fmode), cmode));
}
/*
* Create a file.
*/
int
creat(char *fname, int cmode)
{
return (copen(AT_FDCWD, fname, CREATMODE, cmode));
}
int
openat(int fd, char *path, int fmode, int cmode)
{
return (copen(fd, path, OPENMODE(fmode), cmode));
}
#if defined(_ILP32) || defined(_SYSCALL32_IMPL)
/*
* Open and Creat for large files in 32-bit environment. Sets the FOFFMAX flag.
*/
int
open64(char *fname, int fmode, int cmode)
{
return (copen(AT_FDCWD, fname, OPENMODE64(fmode), cmode));
}
int
creat64(char *fname, int cmode)
{
return (copen(AT_FDCWD, fname, CREATMODE64, cmode));
}
int
openat64(int fd, char *path, int fmode, int cmode)
{
return (copen(fd, path, OPENMODE64(fmode), cmode));
}
#endif /* _ILP32 || _SYSCALL32_IMPL */
#ifdef _SYSCALL32_IMPL
/*
* Open and Creat for 32-bit compatibility on 64-bit kernel
*/
int
open32(char *fname, int fmode, int cmode)
{
return (copen(AT_FDCWD, fname, OPENMODE32(fmode), cmode));
}
int
creat32(char *fname, int cmode)
{
return (copen(AT_FDCWD, fname, CREATMODE32, cmode));
}
int
openat32(int fd, char *path, int fmode, int cmode)
{
return (copen(fd, path, OPENMODE32(fmode), cmode));
}
#endif /* _SYSCALL32_IMPL */
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