/*
 * 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/stat.h>
#include <sys/sysmacros.h>
#include <sys/systm.h>
#include <sys/errno.h>
#include <sys/vnode.h>
#include <sys/vfs.h>
#include <sys/time.h>
#include <sys/debug.h>
#include <sys/model.h>
#include <sys/fcntl.h>
#include <sys/file.h>
#include <sys/pathname.h>
#include <c2/audit.h>

static int
cfutimesat(int fd, char *fname, int nmflag, vattr_t *vap, int flags, int follow)
{
        file_t *fp;
        vnode_t *startvp, *vp;
        int error;
        char startchar;

        if (fd == AT_FDCWD && fname == NULL)
                return (set_errno(EFAULT));

        if (nmflag == 1 || (nmflag == 2 && fname != NULL)) {
                if (copyin(fname, &startchar, sizeof (char)))
                        return (set_errno(EFAULT));
        } else {
                startchar = '\0';
        }

        if (fd == AT_FDCWD) {
                startvp = NULL;
        } else {
                /*
                 * is this absolute path?
                 */
                if (startchar != '/') {
                        if ((fp = getf(fd)) == NULL)
                                return (set_errno(EBADF));
                        startvp = fp->f_vnode;
                        VN_HOLD(startvp);
                        releasef(fd);
                } else {
                        startvp = NULL;
                }
        }

        if ((nmflag == 1) || ((nmflag == 2) && (fname != NULL))) {
                if (AU_AUDITING() && startvp != NULL)
                        audit_setfsat_path(1);
                if ((error = lookupnameat(fname, UIO_USERSPACE,
                    follow, NULLVPP, &vp, startvp)) != 0) {
                        if (startvp != NULL)
                                VN_RELE(startvp);
                        return (set_errno(error));
                }
        } else {
                vp = startvp;
                VN_HOLD(vp);
        }

        if (startvp != NULL) {
                VN_RELE(startvp);
        }

        if (vn_is_readonly(vp)) {
                error = EROFS;
        } else {
                error = VOP_SETATTR(vp, vap, flags, CRED(), NULL);
        }

        VN_RELE(vp);
        if (error != 0)
                return (set_errno(error));
        return (0);
}

static int
get_timespec_vattr(timespec_t *tsptr, struct vattr *vattr, int *flags)
{
        timespec_t ts[2];
        timespec_t now;
        uint_t mask;

        if (tsptr != NULL) {
                if (get_udatamodel() == DATAMODEL_NATIVE) {
                        if (copyin(tsptr, ts, sizeof (ts)))
                                return (EFAULT);
                } else {
                        timespec32_t ts32[2];

                        if (copyin(tsptr, ts32, sizeof (ts32)))
                                return (EFAULT);
                        TIMESPEC32_TO_TIMESPEC(&ts[0], &ts32[0]);
                        TIMESPEC32_TO_TIMESPEC(&ts[1], &ts32[1]);
                }
                if (ts[0].tv_nsec == UTIME_NOW || ts[1].tv_nsec == UTIME_NOW)
                        gethrestime(&now);
                mask = 0;
                if (ts[0].tv_nsec == UTIME_OMIT) {
                        ts[0].tv_nsec = 0;
                } else {
                        mask |= AT_ATIME;
                        if (ts[0].tv_nsec == UTIME_NOW)
                                ts[0] = now;
                        else if (ts[0].tv_nsec < 0 || ts[0].tv_nsec >= NANOSEC)
                                return (EINVAL);
                }
                if (ts[1].tv_nsec == UTIME_OMIT) {
                        ts[1].tv_nsec = 0;
                } else {
                        mask |= AT_MTIME;
                        if (ts[1].tv_nsec == UTIME_NOW)
                                ts[1] = now;
                        else if (ts[1].tv_nsec < 0 || ts[1].tv_nsec >= NANOSEC)
                                return (EINVAL);
                }
                vattr->va_atime = ts[0];
                vattr->va_mtime = ts[1];
                vattr->va_mask = mask;
                *flags = ATTR_UTIME;
        } else {
                gethrestime(&now);
                vattr->va_atime = now;
                vattr->va_mtime = now;
                vattr->va_mask = AT_ATIME | AT_MTIME;
                *flags = 0;
        }

        return (0);
}

int
futimens(int fd, timespec_t *tsptr)
{
        struct vattr vattr;
        int flags;
        int error;

        if ((error = get_timespec_vattr(tsptr, &vattr, &flags)) != 0)
                return (set_errno(error));

        return (cfutimesat(fd, NULL, 2, &vattr, flags, FOLLOW));
}

int
utimensat(int fd, char *fname, timespec_t *tsptr, int flag)
{
        struct vattr vattr;
        int flags;
        int error;

        if ((error = get_timespec_vattr(tsptr, &vattr, &flags)) != 0)
                return (set_errno(error));

        return (cfutimesat(fd, fname, 1, &vattr, flags,
            (flag & AT_SYMLINK_NOFOLLOW)? NO_FOLLOW : FOLLOW));
}

int
utimesys(int code,
    uintptr_t arg1, uintptr_t arg2, uintptr_t arg3, uintptr_t arg4)
{
        switch (code) {
        case 0:
                return (futimens((int)arg1, (timespec_t *)arg2));
        case 1:
                return (utimensat((int)arg1, (char *)arg2,
                    (timespec_t *)arg3, (int)arg4));
        default:
                return (set_errno(EINVAL));
        }
}