/* $NetBSD: vfs_syscalls_12.c,v 1.37.4.1 2022/08/03 11:11:31 martin Exp $ */
/*
* Copyright (c) 1989, 1993
* The Regents of the University of California. All rights reserved.
* (c) UNIX System Laboratories, Inc.
* All or some portions of this file are derived from material licensed
* to the University of California by American Telephone and Telegraph
* Co. or Unix System Laboratories, Inc. and are reproduced herein with
* the permission of UNIX System Laboratories, Inc.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* From: @(#)vfs_syscalls.c 8.28 (Berkeley) 12/10/94
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: vfs_syscalls_12.c,v 1.37.4.1 2022/08/03 11:11:31 martin Exp $");
#if defined(_KERNEL_OPT)
#include "opt_compat_netbsd.h"
#endif
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/namei.h>
#include <sys/filedesc.h>
#include <sys/kernel.h>
#include <sys/file.h>
#include <sys/stat.h>
#include <sys/socketvar.h>
#include <sys/vnode.h>
#include <sys/proc.h>
#include <sys/uio.h>
#include <sys/dirent.h>
#include <sys/vfs_syscalls.h>
#include <sys/syscall.h>
#include <sys/syscallvar.h>
#include <sys/syscallargs.h>
#include <compat/sys/stat.h>
#include <compat/sys/dirent.h>
#include <compat/common/compat_mod.h>
static const struct syscall_package vfs_syscalls_12_syscalls[] = {
{ SYS_compat_12_fstat12, 0, (sy_call_t *)compat_12_sys_fstat },
{ SYS_compat_12_getdirentries, 0,
(sy_call_t *)compat_12_sys_getdirentries },
{ SYS_compat_12_lstat12, 0, (sy_call_t *)compat_12_sys_lstat },
{ SYS_compat_12_stat12, 0, (sy_call_t *)compat_12_sys_stat },
{ 0, 0, NULL }
};
/*
* Convert from a new to an old stat structure.
*/
void
compat_12_stat_conv(const struct stat *st, struct stat12 *ost)
{
memset(ost, 0, sizeof(*ost));
ost->st_dev = st->st_dev;
ost->st_ino = st->st_ino;
ost->st_mode = st->st_mode & 0xffff;
if (st->st_nlink >= (1 << 15))
ost->st_nlink = (1 << 15) - 1;
else
ost->st_nlink = st->st_nlink;
ost->st_uid = st->st_uid;
ost->st_gid = st->st_gid;
ost->st_rdev = st->st_rdev;
timespec_to_timespec50(&st->st_atimespec, &ost->st_atimespec);
timespec_to_timespec50(&st->st_mtimespec, &ost->st_mtimespec);
timespec_to_timespec50(&st->st_ctimespec, &ost->st_ctimespec);
ost->st_size = st->st_size;
ost->st_blocks = st->st_blocks;
ost->st_blksize = st->st_blksize;
ost->st_flags = st->st_flags;
ost->st_gen = st->st_gen;
}
/*
* Read a block of directory entries in a file system independent format.
*/
int
compat_12_sys_getdirentries(struct lwp *l,
const struct compat_12_sys_getdirentries_args *uap, register_t *retval)
{
/* {
syscallarg(int) fd;
syscallarg(char *) buf;
syscallarg(u_int) count;
syscallarg(long *) basep;
} */
struct dirent *bdp;
struct vnode *vp;
char *inp, *tbuf; /* Current-format */
int len, reclen; /* Current-format */
char *outp; /* Dirent12-format */
int resid, old_reclen = 0; /* Dirent12-format */
struct file *fp;
struct uio auio;
struct iovec aiov;
struct dirent12 idb;
off_t off; /* true file offset */
int buflen, error, eofflag, nbytes;
struct vattr va;
off_t *cookiebuf = NULL, *cookie;
int ncookies;
long loff;
/* fd_getvnode() will use the descriptor for us */
if ((error = fd_getvnode(SCARG(uap, fd), &fp)) != 0)
return (error);
if ((fp->f_flag & FREAD) == 0) {
error = EBADF;
goto out1;
}
vp = (struct vnode *)fp->f_vnode;
if (vp->v_type != VDIR) {
error = ENOTDIR;
goto out1;
}
vn_lock(vp, LK_SHARED | LK_RETRY);
error = VOP_GETATTR(vp, &va, l->l_cred);
VOP_UNLOCK(vp);
if (error)
goto out1;
loff = fp->f_offset;
nbytes = SCARG(uap, count);
buflen = uimin(MAXBSIZE, nbytes);
if (buflen < va.va_blocksize)
buflen = va.va_blocksize;
tbuf = malloc(buflen, M_TEMP, M_WAITOK);
vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
off = fp->f_offset;
again:
aiov.iov_base = tbuf;
aiov.iov_len = buflen;
auio.uio_iov = &aiov;
auio.uio_iovcnt = 1;
auio.uio_rw = UIO_READ;
auio.uio_resid = buflen;
auio.uio_offset = off;
UIO_SETUP_SYSSPACE(&auio);
/*
* First we read into the malloc'ed buffer, then
* we massage it into user space, one record at a time.
*/
error = VOP_READDIR(vp, &auio, fp->f_cred, &eofflag, &cookiebuf,
&ncookies);
if (error)
goto out;
inp = tbuf;
outp = SCARG(uap, buf);
resid = nbytes;
if ((len = buflen - auio.uio_resid) == 0)
goto eof;
for (cookie = cookiebuf; len > 0; len -= reclen) {
bdp = (struct dirent *)inp;
reclen = bdp->d_reclen;
if (reclen & 3) {
error = EIO;
goto out;
}
if (bdp->d_fileno == 0) {
inp += reclen; /* it is a hole; squish it out */
if (cookie)
off = *cookie++;
else
off += reclen;
continue;
}
memset(&idb, 0, sizeof(idb));
if (bdp->d_namlen >= sizeof(idb.d_name))
idb.d_namlen = sizeof(idb.d_name) - 1;
else
idb.d_namlen = bdp->d_namlen;
old_reclen = _DIRENT_RECLEN(&idb, bdp->d_namlen);
if (reclen > len || resid < old_reclen) {
/* entry too big for buffer, so just stop */
outp++;
break;
}
/*
* Massage in place to make a Dirent12-shaped dirent (otherwise
* we have to worry about touching user memory outside of
* the copyout() call).
*/
idb.d_fileno = (uint32_t)bdp->d_fileno;
idb.d_reclen = (uint16_t)old_reclen;
idb.d_type = (uint8_t)bdp->d_type;
(void)memcpy(idb.d_name, bdp->d_name, idb.d_namlen);
memset(idb.d_name + idb.d_namlen, 0,
idb.d_reclen - _DIRENT_NAMEOFF(&idb) - idb.d_namlen);
if ((error = copyout(&idb, outp, old_reclen)))
goto out;
/* advance past this real entry */
inp += reclen;
if (cookie)
off = *cookie++; /* each entry points to itself */
else
off += reclen;
/* advance output past Dirent12-shaped entry */
outp += old_reclen;
resid -= old_reclen;
}
/* if we squished out the whole block, try again */
if (outp == SCARG(uap, buf)) {
if (cookiebuf)
free(cookiebuf, M_TEMP);
cookiebuf = NULL;
goto again;
}
fp->f_offset = off; /* update the vnode offset */
eof:
*retval = nbytes - resid;
out:
VOP_UNLOCK(vp);
if (cookiebuf)
free(cookiebuf, M_TEMP);
free(tbuf, M_TEMP);
out1:
fd_putfile(SCARG(uap, fd));
if (error)
return error;
return copyout(&loff, SCARG(uap, basep), sizeof(long));
}
/*
* Get file status; this version follows links.
*/
/* ARGSUSED */
int
compat_12_sys_stat(struct lwp *l, const struct compat_12_sys_stat_args *uap,
register_t *retval)
{
/* {
syscallarg(const char *) path;
syscallarg(struct stat12 *) ub;
} */
struct stat sb;
struct stat12 osb;
int error;
error = do_sys_stat(SCARG(uap, path), FOLLOW, &sb);
if (error)
return (error);
compat_12_stat_conv(&sb, &osb);
error = copyout(&osb, SCARG(uap, ub), sizeof (osb));
return (error);
}
/*
* Get file status; this version does not follow links.
*/
/* ARGSUSED */
int
compat_12_sys_lstat(struct lwp *l, const struct compat_12_sys_lstat_args *uap,
register_t *retval)
{
/* {
syscallarg(const char *) path;
syscallarg(struct stat12 *) ub;
} */
struct stat sb;
struct stat12 osb;
int error;
error = do_sys_stat(SCARG(uap, path), NOFOLLOW, &sb);
if (error)
return (error);
compat_12_stat_conv(&sb, &osb);
error = copyout(&osb, SCARG(uap, ub), sizeof (osb));
return (error);
}
/*
* Return status information about a file descriptor.
*/
/* ARGSUSED */
int
compat_12_sys_fstat(struct lwp *l, const struct compat_12_sys_fstat_args *uap,
register_t *retval)
{
/* {
syscallarg(int) fd;
syscallarg(struct stat12 *) sb;
} */
struct stat ub;
struct stat12 oub;
int error;
error = do_sys_fstat(SCARG(uap, fd), &ub);
if (error == 0) {
compat_12_stat_conv(&ub, &oub);
error = copyout(&oub, SCARG(uap, sb), sizeof (oub));
}
return (error);
}
int
vfs_syscalls_12_init(void)
{
return syscall_establish(NULL, vfs_syscalls_12_syscalls);
}
int
vfs_syscalls_12_fini(void)
{
return syscall_disestablish(NULL, vfs_syscalls_12_syscalls);
}