/*
 * 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) 1988, 2010, Oracle and/or its affiliates. All rights reserved.
 * Copyright 2016 Joyent, Inc.
 * Copyright 2017 Nexenta Systems, Inc.  All rights reserved.
 */

/*      Copyright (c) 1983, 1984, 1985, 1986, 1987, 1988, 1989 AT&T     */
/*        All Rights Reserved   */

/*
 * University Copyright- Copyright (c) 1982, 1986, 1988
 * The Regents of the University of California
 * All Rights Reserved
 *
 * University Acknowledgment- Portions of this document are derived from
 * software developed by the University of California, Berkeley, and its
 * contributors.
 */

#include <sys/types.h>
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/errno.h>
#include <sys/cred.h>
#include <sys/user.h>
#include <sys/uio.h>
#include <sys/vfs.h>
#include <sys/vnode.h>
#include <sys/pathname.h>
#include <sys/proc.h>
#include <sys/vtrace.h>
#include <sys/sysmacros.h>
#include <sys/debug.h>
#include <sys/dirent.h>
#include <sys/zone.h>
#include <sys/fs/snode.h>

#include <libfksmbfs.h>

extern vnode_t *rootdir;

/*
 * Simplified variation on lookuppnvp()
 */
int
fake_lookup(vnode_t *dvp, char *path, vnode_t **vpp)
{
        char component[MAXNAMELEN];     /* buffer for component */
        pathname_t pn;
        cred_t *cr;
        vnode_t *cvp;   /* current component vp */
        vnode_t *nvp;   /* next component vp */
        char *p;
        int flags = 0;
        int error, len;

        bzero(&pn, sizeof (pn));
        pn.pn_buf = path;
        pn.pn_path = path;
        pn.pn_pathlen = strlen(path);
        pn.pn_bufsize = pn.pn_pathlen + 1;
        p = path;

        cr = CRED();
        cvp = (dvp != NULL) ? dvp : rootdir;
        VN_HOLD(cvp);
        nvp = NULL;

        while (*p != '\0') {
                if (*p == '/') {
                        p++;
                        continue;
                }

                len = strcspn(p, "/");
                ASSERT(len > 0);
                if (len >= MAXNAMELEN)
                        return (EINVAL);
                (void) strncpy(component, p, len);
                component[len] = '\0';
                pn.pn_path = p;
                pn.pn_pathlen = strlen(p);

                error = VOP_LOOKUP(cvp, component, &nvp, &pn, flags,
                    rootdir, cr, NULL, NULL, NULL);
                VN_RELE(cvp);
                if (error != 0)
                        return (error);

                /* Lookup gave us a hold on nvp */
                cvp = nvp;
                nvp = NULL;
                p += len;
        }

        *vpp = cvp;
        return (0);
}

/*
 * Lookup the directory and find the start of the
 * last component of the given path.
 */
int
fake_lookup_dir(char *path, vnode_t **vpp, char **lastcomp)
{
        vnode_t *dvp;
        char *last;
        char *tpn = NULL;
        int tpn_sz;
        int lc_off;
        int error;

        *vpp = NULL;
        *lastcomp = NULL;

        tpn_sz = strlen(path) + 1;
        tpn = kmem_alloc(tpn_sz, KM_SLEEP);

        /*
         * Get a copy of the path, and zap the last /
         */
        bcopy(path, tpn, tpn_sz);
        last = strrchr(tpn, '/');
        if (last == NULL) {
                lc_off = 0;
                dvp = rootdir;
                VN_HOLD(dvp);
                error = 0;
        } else {
                *last++ = '\0';
                if (*last == '\0') {
                        error = EINVAL;
                        goto out;
                }
                error = fake_lookup(rootdir, tpn, &dvp);
                if (error != 0) {
                        /* dir not found */
                        goto out;
                }
                lc_off = last - tpn;
                ASSERT(lc_off >= 0 && lc_off < tpn_sz);
        }
        *vpp = dvp;
        *lastcomp = path + lc_off;

out:
        if (tpn != NULL)
                kmem_free(tpn, tpn_sz);

        return (error);
}