/*-
 * SPDX-License-Identifier: BSD-4-Clause
 *
 * Copyright (c) 1995, 1996
 *      Bill Paul <wpaul@ctr.columbia.edu>.  All rights reserved.
 *
 * 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. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *      This product includes software developed by Bill Paul.
 * 4. Neither the name of the author nor the names of any co-contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY Bill Paul 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 Bill Paul 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>
#include "ypxfrd.h"

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <errno.h>
#include <sys/types.h>
#include <sys/param.h>
#include <sys/uio.h>
#include <sys/fcntl.h>
#include <machine/endian.h>
#include "ypxfrd_extern.h"

int forked = 0;
int children = 0;
int fp = 0;

static bool_t
xdr_my_xfr(register XDR *xdrs, xfr *objp)
{
        unsigned char buf[XFRBLOCKSIZE];

        while (1) {
                if ((objp->xfr_u.xfrblock_buf.xfrblock_buf_len =
                    read(fp, &buf, XFRBLOCKSIZE)) != -1) {
                        objp->ok = TRUE;
                        objp->xfr_u.xfrblock_buf.xfrblock_buf_val = (char *)&buf;
                } else {
                        objp->ok = FALSE;
                        objp->xfr_u.xfrstat = XFR_READ_ERR;
                        yp_error("read error: %s", strerror(errno));
                }

                /* Serialize */
                if (!xdr_xfr(xdrs, objp))
                        return(FALSE);
                if (objp->ok == FALSE)
                        return(TRUE);
                if (objp->xfr_u.xfrblock_buf.xfrblock_buf_len < XFRBLOCKSIZE) {
                        objp->ok = FALSE;
                        objp->xfr_u.xfrstat = XFR_DONE;
                        if (!xdr_xfr(xdrs, objp))
                                return(FALSE);
                        return(TRUE);
                }
        }
}

struct xfr *
ypxfrd_getmap_1_svc(ypxfr_mapname *argp, struct svc_req *rqstp)
{
        static struct xfr  result;
        char buf[MAXPATHLEN];

        result.ok = FALSE;
        result.xfr_u.xfrstat = XFR_DENIED;

        if (yp_validdomain(argp->xfrdomain)) {
                return(&result);
        }

        if (yp_access(argp->xfrmap, (struct svc_req *)rqstp)) {
                return(&result);
        }

        snprintf (buf, sizeof(buf), "%s/%s/%s", yp_dir, argp->xfrdomain,
                                                        argp->xfrmap);
        if (access(buf, R_OK) == -1) {
                result.xfr_u.xfrstat = XFR_ACCESS;
                return(&result);
        }

        if (argp->xfr_db_type != XFR_DB_BSD_HASH &&
            argp->xfr_db_type != XFR_DB_ANY) {
                result.xfr_u.xfrstat = XFR_DB_TYPE_MISMATCH;
                return(&result);
        }

#if BYTE_ORDER == LITTLE_ENDIAN
        if (argp->xfr_byte_order == XFR_ENDIAN_BIG) {
#else
        if (argp->xfr_byte_order == XFR_ENDIAN_LITTLE) {
#endif
                result.xfr_u.xfrstat = XFR_DB_ENDIAN_MISMATCH;
                return(&result);
        }

#ifndef DEBUG
        if (children < MAX_CHILDREN && fork()) {
                children++;
                forked = 0;
                return (NULL);
        } else {
                forked++;
        }
#endif
        if ((fp = open(buf, O_RDONLY)) == -1) {
                result.xfr_u.xfrstat = XFR_READ_ERR;
                return(&result);
        }

        /* Start sending the file. */

        svc_sendreply(rqstp->rq_xprt, (xdrproc_t)xdr_my_xfr, &result);

        close(fp);

        return (NULL);
}