/*      $OpenBSD: yp_first.c,v 1.12 2022/08/02 16:59:29 deraadt Exp $ */
/*
 * Copyright (c) 1992, 1993 Theo de Raadt <deraadt@theos.com>
 * 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.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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/types.h>
#include <limits.h>
#include <stdlib.h>
#include <string.h>
#include <rpc/rpc.h>
#include <rpc/xdr.h>
#include <rpcsvc/yp.h>
#include <rpcsvc/ypclnt.h>
#include "ypinternal.h"

int
yp_first(const char *indomain, const char *inmap, char **outkey, int *outkeylen,
    char **outval, int *outvallen)
{
        struct ypresp_key_val yprkv;
        struct ypreq_nokey yprnk;
        struct dom_binding *ysd = NULL;
        struct timeval  tv;
        int tries = 0, r;

        if (indomain == NULL || *indomain == '\0' ||
            strlen(indomain) > YPMAXDOMAIN || inmap == NULL ||
            *inmap == '\0' || strlen(inmap) > YPMAXMAP)
                return YPERR_BADARGS;

        *outkey = *outval = NULL;
        *outkeylen = *outvallen = 0;

again:
        if (_yp_dobind(indomain, &ysd) != 0)
                return YPERR_DOMAIN;

        tv.tv_sec = _yplib_timeout;
        tv.tv_usec = 0;

        yprnk.domain = (char *)indomain;
        yprnk.map = (char *)inmap;
        (void)memset(&yprkv, 0, sizeof yprkv);

        r = clnt_call(ysd->dom_client, YPPROC_FIRST,
            xdr_ypreq_nokey, &yprnk, xdr_ypresp_key_val, &yprkv, tv);
        if (r != RPC_SUCCESS) {
                if (tries++)
                        clnt_perror(ysd->dom_client, "yp_first: clnt_call");
                _yp_unbind(ysd);
                goto again;
        }
        if (!(r = ypprot_err(yprkv.stat))) {
                *outkeylen = yprkv.key.keydat_len;
                *outvallen = yprkv.val.valdat_len;
                if ((*outkey = malloc(*outkeylen + 1)) == NULL ||
                    (*outval = malloc(*outvallen + 1)) == NULL) {
                        free(*outkey);
                        r = YPERR_RESRC;
                } else {
                        (void)memcpy(*outkey, yprkv.key.keydat_val, *outkeylen);
                        (*outkey)[*outkeylen] = '\0';
                        (void)memcpy(*outval, yprkv.val.valdat_val, *outvallen);
                        (*outval)[*outvallen] = '\0';
                }
        }
        xdr_free(xdr_ypresp_key_val, (char *) &yprkv);
        _yp_unbind(ysd);
        return r;
}
DEF_WEAK(yp_first);