/*      $OpenBSD: yppoll.c,v 1.15 2015/01/16 06:40:22 deraadt Exp $ */
/*      $NetBSD: yppoll.c,v 1.5 1996/05/13 02:46:36 thorpej Exp $       */

/*-
 * SPDX-License-Identifier: BSD-3-Clause
 *
 * Copyright (c) 1992, 1993 Theo de Raadt <deraadt@openbsd.org>
 * Copyright (c) 1992, 1993 John Brezak
 * 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. The name of the author may not be used to endorse or promote
 *    products derived from this software without specific prior written
 *    permission.
 *
 * 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/param.h>
#include <sys/types.h>
#include <sys/socket.h>

#include <arpa/inet.h>
#include <netinet/in.h>

#include <ctype.h>
#include <err.h>
#include <netdb.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <unistd.h>

#include <rpc/rpc.h>
#include <rpc/xdr.h>
#include <rpcsvc/yp_prot.h>
#include <rpcsvc/ypclnt.h>

static void
usage(void)
{
        fprintf(stderr, "usage: yppoll [-d domain] [-h host] mapname\n");
        exit(1);
}

static int
get_remote_info(char *indomain, char *inmap, char *server, int *outorder,
    char **outname)
{
        struct ypresp_order ypro;
        struct ypresp_master yprm;
        struct ypreq_nokey yprnk;
        struct timeval tv;
        struct sockaddr_in rsrv_sin;
        int rsrv_sock;
        CLIENT *client;
        struct hostent *h;
        int r;

        bzero((char *)&rsrv_sin, sizeof rsrv_sin);
        rsrv_sin.sin_len = sizeof rsrv_sin;
        rsrv_sin.sin_family = AF_INET;
        rsrv_sock = RPC_ANYSOCK;

        h = gethostbyname(server);
        if (h == NULL) {
                if (inet_aton(server, &rsrv_sin.sin_addr) == 0)
                        errx(1, "unknown host %s.", server);
        } else
                rsrv_sin.sin_addr.s_addr = *(u_int32_t *)h->h_addr;

        tv.tv_sec = 10;
        tv.tv_usec = 0;

        client = clntudp_create(&rsrv_sin, YPPROG, YPVERS, tv, &rsrv_sock);
        if (client == NULL)
                errx(1, "clntudp_create: no contact with host %s.", server);

        yprnk.domain = indomain;
        yprnk.map = inmap;

        bzero((char *)(char *)&ypro, sizeof ypro);

        r = clnt_call(client, YPPROC_ORDER, (xdrproc_t)xdr_ypreq_nokey, &yprnk,
            (xdrproc_t)xdr_ypresp_order, &ypro, tv);
        if (r != RPC_SUCCESS)
                clnt_perror(client, "yp_order: clnt_call");

        *outorder = ypro.ordernum;
        xdr_free((xdrproc_t)xdr_ypresp_order, (char *)&ypro);

        r = ypprot_err(ypro.status);
        if (r == RPC_SUCCESS) {
                bzero((char *)&yprm, sizeof yprm);

                r = clnt_call(client, YPPROC_MASTER, (xdrproc_t)xdr_ypreq_nokey,
                    &yprnk, (xdrproc_t)xdr_ypresp_master, &yprm, tv);
                if (r != RPC_SUCCESS)
                        clnt_perror(client, "yp_master: clnt_call");
                r = ypprot_err(yprm.status);
                if (r == 0)
                        *outname = (char *)strdup(yprm.master);
                xdr_free((xdrproc_t)xdr_ypresp_master, (char *)&yprm);
        }
        clnt_destroy(client);
        return (r);
}

int
main(int argc, char *argv[])
{
        char *domainname, *hostname = NULL, *inmap, *master;
        int order, c, r;
        time_t torder;

        yp_get_default_domain(&domainname);

        while ((c = getopt(argc, argv, "h:d:")) != -1)
                switch (c) {
                case 'd':
                        domainname = optarg;
                        break;
                case 'h':
                        hostname = optarg;
                        break;
                default:
                        usage();
                        /*NOTREACHED*/
                }

        if (optind + 1 != argc)
                usage();
        inmap = argv[optind];

        if (hostname != NULL) {
                r = get_remote_info(domainname, inmap, hostname,
                    &order, &master);
        } else {
                r = yp_order(domainname, inmap, &order);
                if (r == 0)
                        r = yp_master(domainname, inmap, &master);
        }

        if (r != 0)
                errx(1, "no such map %s: reason: %s",
                    inmap, yperr_string(r));

        torder = order;
        printf("Map %s has order number %lld. %s", inmap,
            (long long)order, ctime(&torder));
        printf("The master server is %s.\n", master);

        exit(0);
}