NetBSD/sys/compat/svr4/svr4_fcntl.c

/*	$NetBSD: svr4_fcntl.c,v 1.74 2014/11/09 18:16:55 maxv Exp $	 */

/*-
 * Copyright (c) 1994, 1997, 2008 The NetBSD Foundation, Inc.
 * All rights reserved.
 *
 * This code is derived from software contributed to The NetBSD Foundation
 * by Christos Zoulas.
 *
 * 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.
 *
 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. 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 FOUNDATION 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.
 */

#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: svr4_fcntl.c,v 1.74 2014/11/09 18:16:55 maxv Exp $");

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/namei.h>
#include <sys/proc.h>
#include <sys/file.h>
#include <sys/stat.h>
#include <sys/filedesc.h>
#include <sys/ioctl.h>
#include <sys/kernel.h>
#include <sys/mount.h>
#include <sys/vnode.h>
#include <sys/kauth.h>

#include <sys/syscallargs.h>

#include <compat/svr4/svr4_types.h>
#include <compat/svr4/svr4_signal.h>
#include <compat/svr4/svr4_ucontext.h>
#include <compat/svr4/svr4_lwp.h>
#include <compat/svr4/svr4_syscallargs.h>
#include <compat/svr4/svr4_util.h>
#include <compat/svr4/svr4_fcntl.h>

static int svr4_to_bsd_flags(int);
static int bsd_to_svr4_flags(int);
static void bsd_to_svr4_flock(struct flock *, struct svr4_flock *);
static void svr4_to_bsd_flock(struct svr4_flock *, struct flock *);
static void bsd_to_svr4_flock64(struct flock *, struct svr4_flock64 *);
static void svr4_to_bsd_flock64(struct svr4_flock64 *, struct flock *);
static int fd_revoke(struct lwp *, int, register_t *);
static int fd_truncate(struct lwp *, int, struct flock *, register_t *);


static int
svr4_to_bsd_flags(int l)
{
	int	r = 0;
	r |= (l & SVR4_O_RDONLY) ? O_RDONLY : 0;
	r |= (l & SVR4_O_WRONLY) ? O_WRONLY : 0;
	r |= (l & SVR4_O_RDWR) ? O_RDWR : 0;
	r |= (l & SVR4_O_NDELAY) ? O_NDELAY : 0;
	r |= (l & SVR4_O_APPEND) ? O_APPEND : 0;
	r |= (l & SVR4_O_SYNC) ? O_FSYNC : 0;
	r |= (l & SVR4_O_RSYNC) ? O_RSYNC : 0;
	r |= (l & SVR4_O_DSYNC) ? O_DSYNC : 0;
	r |= (l & SVR4_O_NONBLOCK) ? O_NONBLOCK : 0;
	r |= (l & SVR4_O_PRIV) ? O_EXLOCK : 0;
	r |= (l & SVR4_O_CREAT) ? O_CREAT : 0;
	r |= (l & SVR4_O_TRUNC) ? O_TRUNC : 0;
	r |= (l & SVR4_O_EXCL) ? O_EXCL : 0;
	r |= (l & SVR4_O_NOCTTY) ? O_NOCTTY : 0;
	return r;
}


static int
bsd_to_svr4_flags(int l)
{
	int	r = 0;
	r |= (l & O_RDONLY) ? SVR4_O_RDONLY : 0;
	r |= (l & O_WRONLY) ? SVR4_O_WRONLY : 0;
	r |= (l & O_RDWR) ? SVR4_O_RDWR : 0;
	r |= (l & O_NDELAY) ? SVR4_O_NDELAY : 0;
	r |= (l & O_APPEND) ? SVR4_O_APPEND : 0;
	r |= (l & O_FSYNC) ? SVR4_O_SYNC : 0;
	r |= (l & O_RSYNC) ? SVR4_O_RSYNC : 0;
	r |= (l & O_DSYNC) ? SVR4_O_DSYNC : 0;
	r |= (l & O_NONBLOCK) ? SVR4_O_NONBLOCK : 0;
	r |= (l & O_EXLOCK) ? SVR4_O_PRIV : 0;
	r |= (l & O_CREAT) ? SVR4_O_CREAT : 0;
	r |= (l & O_TRUNC) ? SVR4_O_TRUNC : 0;
	r |= (l & O_EXCL) ? SVR4_O_EXCL : 0;
	r |= (l & O_NOCTTY) ? SVR4_O_NOCTTY : 0;
	return r;
}


static void
bsd_to_svr4_flock(struct flock *iflp, struct svr4_flock *oflp)
{
	switch (iflp->l_type) {
	case F_RDLCK:
		oflp->l_type = SVR4_F_RDLCK;
		break;
	case F_WRLCK:
		oflp->l_type = SVR4_F_WRLCK;
		break;
	case F_UNLCK:
		oflp->l_type = SVR4_F_UNLCK;
		break;
	default:
		oflp->l_type = -1;
		break;
	}

	oflp->l_whence = (short) iflp->l_whence;
	oflp->l_start = (svr4_off_t) iflp->l_start;
	oflp->l_len = (svr4_off_t) iflp->l_len;
	oflp->l_sysid = 0;
	oflp->l_pid = (svr4_pid_t) iflp->l_pid;
}


static void
svr4_to_bsd_flock(struct svr4_flock *iflp, struct flock *oflp)
{
	switch (iflp->l_type) {
	case SVR4_F_RDLCK:
		oflp->l_type = F_RDLCK;
		break;
	case SVR4_F_WRLCK:
		oflp->l_type = F_WRLCK;
		break;
	case SVR4_F_UNLCK:
		oflp->l_type = F_UNLCK;
		break;
	default:
		oflp->l_type = -1;
		break;
	}

	oflp->l_whence = iflp->l_whence;
	oflp->l_start = (off_t) iflp->l_start;
	oflp->l_len = (off_t) iflp->l_len;
	oflp->l_pid = (pid_t) iflp->l_pid;

}

static void
bsd_to_svr4_flock64(struct flock *iflp, struct svr4_flock64 *oflp)
{
	switch (iflp->l_type) {
	case F_RDLCK:
		oflp->l_type = SVR4_F_RDLCK;
		break;
	case F_WRLCK:
		oflp->l_type = SVR4_F_WRLCK;
		break;
	case F_UNLCK:
		oflp->l_type = SVR4_F_UNLCK;
		break;
	default:
		oflp->l_type = -1;
		break;
	}

	oflp->l_whence = (short) iflp->l_whence;
	oflp->l_start = (svr4_off64_t) iflp->l_start;
	oflp->l_len = (svr4_off64_t) iflp->l_len;
	oflp->l_sysid = 0;
	oflp->l_pid = (svr4_pid_t) iflp->l_pid;
}


static void
svr4_to_bsd_flock64(struct svr4_flock64 *iflp, struct flock *oflp)
{
	switch (iflp->l_type) {
	case SVR4_F_RDLCK:
		oflp->l_type = F_RDLCK;
		break;
	case SVR4_F_WRLCK:
		oflp->l_type = F_WRLCK;
		break;
	case SVR4_F_UNLCK:
		oflp->l_type = F_UNLCK;
		break;
	default:
		oflp->l_type = -1;
		break;
	}

	oflp->l_whence = iflp->l_whence;
	oflp->l_start = (off_t) iflp->l_start;
	oflp->l_len = (off_t) iflp->l_len;
	oflp->l_pid = (pid_t) iflp->l_pid;

}


static int
fd_revoke(struct lwp *l, int fd, register_t *retval)
{
	file_t *fp;
	vnode_t *vp;
	int error;

	if ((error = fd_getvnode(fd, &fp)) != 0)
		return error;

	vp = fp->f_vnode;
	if (vp->v_type != VCHR && vp->v_type != VBLK) {
		error = EINVAL;
	} else {
		error = dorevoke(vp, l->l_cred);
	}

	vrele(vp);
	fd_putfile(fd);
	return error;
}


static int
fd_truncate(struct lwp *l, int fd, struct flock *flp, register_t *retval)
{
	file_t *fp;
	off_t start, length;
	vnode_t *vp;
	struct vattr vattr;
	int error;
	struct sys_ftruncate_args ft;

	/*
	 * We only support truncating the file.
	 */
	if ((fp = fd_getfile(fd)) == NULL)
		return EBADF;

	vp = fp->f_vnode;
	if (fp->f_type != DTYPE_VNODE || vp->v_type == VFIFO) {
		fd_putfile(fd);
		return ESPIPE;
	}
	vn_lock(vp, LK_SHARED | LK_RETRY);
	error = VOP_GETATTR(vp, &vattr, l->l_cred);
	VOP_UNLOCK(vp);
	if (error) {
		fd_putfile(fd);
		return error;
	}

	length = vattr.va_size;

	switch (flp->l_whence) {
	case SEEK_CUR:
		start = fp->f_offset + flp->l_start;
		break;

	case SEEK_END:
		start = flp->l_start + length;
		break;

	case SEEK_SET:
		start = flp->l_start;
		break;

	default:
		fd_putfile(fd);
		return EINVAL;
	}

	if (start + flp->l_len < length) {
		/* We don't support free'ing in the middle of the file */
		fd_putfile(fd);
		return EINVAL;
	}

	SCARG(&ft, fd) = fd;
	SCARG(&ft, length) = start;

	error = sys_ftruncate(l, &ft, retval);
	fd_putfile(fd);
	return error;
}


int
svr4_sys_open(struct lwp *l, const struct svr4_sys_open_args *uap, register_t *retval)
{
	int			error;
	struct sys_open_args	cup;

	SCARG(&cup, flags) = svr4_to_bsd_flags(SCARG(uap, flags));

	SCARG(&cup, path) = SCARG(uap, path);
	SCARG(&cup, mode) = SCARG(uap, mode);
	error = sys_open(l, &cup, retval);

	if (error)
		return error;

	/* XXXAD locking */

	if (!(SCARG(&cup, flags) & O_NOCTTY) && SESS_LEADER(l->l_proc) &&
	    !(l->l_proc->p_lflag & PL_CONTROLT)) {
		file_t *fp;
		fp = fd_getfile(*retval);

		/* ignore any error, just give it a try */
		if (fp != NULL) {
			if (fp->f_type == DTYPE_VNODE)
				(fp->f_ops->fo_ioctl)(fp, TIOCSCTTY, NULL);
			fd_putfile(*retval);
		}
	}
	return 0;
}


int
svr4_sys_open64(struct lwp *l, const struct svr4_sys_open64_args *uap, register_t *retval)
{
	return svr4_sys_open(l, (const void *)uap, retval);
}


int
svr4_sys_creat(struct lwp *l, const struct svr4_sys_creat_args *uap, register_t *retval)
{
	struct sys_open_args cup;

	SCARG(&cup, path) = SCARG(uap, path);
	SCARG(&cup, mode) = SCARG(uap, mode);
	SCARG(&cup, flags) = O_WRONLY | O_CREAT | O_TRUNC;

	return sys_open(l, &cup, retval);
}


int
svr4_sys_creat64(struct lwp *l, const struct svr4_sys_creat64_args *uap, register_t *retval)
{
	return svr4_sys_creat(l, (const void *)uap, retval);
}


int
svr4_sys_llseek(struct lwp *l, const struct svr4_sys_llseek_args *uap, register_t *retval)
{
	struct sys_lseek_args ap;

	SCARG(&ap, fd) = SCARG(uap, fd);

#if BYTE_ORDER == BIG_ENDIAN
	SCARG(&ap, offset) = (((long long) SCARG(uap, offset1)) << 32) |
		SCARG(uap, offset2);
#else
	SCARG(&ap, offset) = (((long long) SCARG(uap, offset2)) << 32) |
		SCARG(uap, offset1);
#endif
	SCARG(&ap, whence) = SCARG(uap, whence);

	return sys_lseek(l, &ap, retval);
}

int
svr4_sys_access(struct lwp *l, const struct svr4_sys_access_args *uap, register_t *retval)
{
	struct sys_access_args cup;

	SCARG(&cup, path) = SCARG(uap, path);
	SCARG(&cup, flags) = SCARG(uap, flags);

	return sys_access(l, &cup, retval);
}


int
svr4_sys_pread(struct lwp *l, const struct svr4_sys_pread_args *uap, register_t *retval)
{
	struct sys_pread_args pra;

	/*
	 * Just translate the args structure and call the NetBSD
	 * pread(2) system call (offset type is 64-bit in NetBSD).
	 */
	SCARG(&pra, fd) = SCARG(uap, fd);
	SCARG(&pra, buf) = SCARG(uap, buf);
	SCARG(&pra, nbyte) = SCARG(uap, nbyte);
	SCARG(&pra, offset) = SCARG(uap, off);

	return (sys_pread(l, &pra, retval));
}


int
svr4_sys_pread64(struct lwp *l, const struct svr4_sys_pread64_args *uap, register_t *retval)
{
	struct sys_pread_args pra;

	/*
	 * Just translate the args structure and call the NetBSD
	 * pread(2) system call (offset type is 64-bit in NetBSD).
	 */
	SCARG(&pra, fd) = SCARG(uap, fd);
	SCARG(&pra, buf) = SCARG(uap, buf);
	SCARG(&pra, nbyte) = SCARG(uap, nbyte);
	SCARG(&pra, offset) = SCARG(uap, off);

	return (sys_pread(l, &pra, retval));
}


int
svr4_sys_pwrite(struct lwp *l, const struct svr4_sys_pwrite_args *uap, register_t *retval)
{
	struct sys_pwrite_args pwa;

	/*
	 * Just translate the args structure and call the NetBSD
	 * pwrite(2) system call (offset type is 64-bit in NetBSD).
	 */
	SCARG(&pwa, fd) = SCARG(uap, fd);
	SCARG(&pwa, buf) = SCARG(uap, buf);
	SCARG(&pwa, nbyte) = SCARG(uap, nbyte);
	SCARG(&pwa, offset) = SCARG(uap, off);

	return (sys_pwrite(l, &pwa, retval));
}


int
svr4_sys_pwrite64(struct lwp *l, const struct svr4_sys_pwrite64_args *uap, register_t *retval)
{
	struct sys_pwrite_args pwa;

	/*
	 * Just translate the args structure and call the NetBSD
	 * pwrite(2) system call (offset type is 64-bit in NetBSD).
	 */
	SCARG(&pwa, fd) = SCARG(uap, fd);
	SCARG(&pwa, buf) = SCARG(uap, buf);
	SCARG(&pwa, nbyte) = SCARG(uap, nbyte);
	SCARG(&pwa, offset) = SCARG(uap, off);

	return (sys_pwrite(l, &pwa, retval));
}


int
svr4_sys_fcntl(struct lwp *l, const struct svr4_sys_fcntl_args *uap, register_t *retval)
{
	struct sys_fcntl_args	fa;
	register_t		flags;
	struct svr4_flock64	ifl64;
	struct svr4_flock	ifl;
	struct flock		fl;
	int error;
	int cmd;

	SCARG(&fa, fd) = SCARG(uap, fd);
	SCARG(&fa, arg) = SCARG(uap, arg);

	switch (SCARG(uap, cmd)) {
	case SVR4_F_DUPFD:
		cmd = F_DUPFD;
		break;
	case SVR4_F_GETFD:
		cmd = F_GETFD;
		break;
	case SVR4_F_SETFD:
		cmd = F_SETFD;
		break;

	case SVR4_F_GETFL:
		cmd = F_GETFL;
		break;

	case SVR4_F_SETFL:
		/*
		 * we must save the O_ASYNC flag, as that is
		 * handled by ioctl(_, I_SETSIG, _) emulation.
		 */
		SCARG(&fa, cmd) = F_GETFL;
		if ((error = sys_fcntl(l, &fa, &flags)) != 0)
			return error;
		flags &= O_ASYNC;
		flags |= svr4_to_bsd_flags((u_long) SCARG(uap, arg));
		cmd = F_SETFL;
		SCARG(&fa, arg) = (void *) flags;
		break;

	case SVR4_F_GETLK:
		cmd = F_GETLK;
		goto lock32;
	case SVR4_F_SETLK:
		cmd = F_SETLK;
		goto lock32;
	case SVR4_F_SETLKW:
		cmd = F_SETLKW;
	    lock32:
		error = copyin(SCARG(uap, arg), &ifl, sizeof ifl);
		if (error)
			return error;
		svr4_to_bsd_flock(&ifl, &fl);

		error = do_fcntl_lock(SCARG(uap, fd), cmd, &fl);
		if (cmd != F_GETLK || error != 0)
			return error;

		bsd_to_svr4_flock(&fl, &ifl);
		return copyout(&ifl, SCARG(uap, arg), sizeof ifl);

	case SVR4_F_DUP2FD:
		{
			struct sys_dup2_args du;

			SCARG(&du, from) = SCARG(uap, fd);
			SCARG(&du, to) = (int)(u_long)SCARG(uap, arg);
			error = sys_dup2(l, &du, retval);
			if (error)
				return error;
			*retval = SCARG(&du, to);
			return 0;
		}

	case SVR4_F_FREESP:
		error = copyin(SCARG(uap, arg), &ifl, sizeof ifl);
		if (error)
			return error;
		svr4_to_bsd_flock(&ifl, &fl);
		return fd_truncate(l, SCARG(uap, fd), &fl, retval);

	case SVR4_F_GETLK64:
		cmd = F_GETLK;
		goto lock64;
	case SVR4_F_SETLK64:
		cmd = F_SETLK;
		goto lock64;
	case SVR4_F_SETLKW64:
		cmd = F_SETLKW;
	    lock64:
		error = copyin(SCARG(uap, arg), &ifl64, sizeof ifl64);
		if (error)
			return error;
		svr4_to_bsd_flock64(&ifl64, &fl);

		error = do_fcntl_lock(SCARG(uap, fd), cmd, &fl);
		if (cmd != F_GETLK || error != 0)
			return error;

		bsd_to_svr4_flock64(&fl, &ifl64);
		return copyout(&ifl64, SCARG(uap, arg), sizeof ifl64);

	case SVR4_F_FREESP64:
		error = copyin(SCARG(uap, arg), &ifl64, sizeof ifl64);
		if (error)
			return error;
		svr4_to_bsd_flock64(&ifl64, &fl);
		return fd_truncate(l, SCARG(uap, fd), &fl, retval);

	case SVR4_F_REVOKE:
		return fd_revoke(l, SCARG(uap, fd), retval);

	default:
		return ENOSYS;
	}

	SCARG(&fa, cmd) = cmd;

	error = sys_fcntl(l, &fa, retval);
	if (error != 0)
		return error;

	switch (SCARG(uap, cmd)) {

	case SVR4_F_GETFL:
		*retval = bsd_to_svr4_flags(*retval);
		break;
	}

	return 0;
}