/*      $NetBSD: yppoll.c,v 1.15 2011/08/30 17:06:22 plunky Exp $       */

/*
 * Copyright (c) 1992, 1993 Theo de Raadt <deraadt@fsa.ca>
 * 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.
 */

/*
 * 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/cdefs.h>
#ifndef lint
__RCSID("$NetBSD: yppoll.c,v 1.15 2011/08/30 17:06:22 plunky Exp $");
#endif /* not lint */

#include <sys/param.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <err.h>
#include <stdio.h>
#include <stdlib.h>
#include <time.h>
#include <netdb.h>
#include <unistd.h>
#include <string.h>
#include <netinet/in.h>
#include <arpa/inet.h>

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

static CLIENT *mkclient(struct sockaddr_in *, unsigned long, unsigned long,
    int);
static int get_remote_info(const char *, const char *, const char *, int *,
    char **, int);
static void usage(void) __attribute__((__noreturn__));

int
main(int  argc, char *argv[])
{
        char *domainname;
        char *hostname = NULL;
        char *inmap, *master;
        int order;
        int c, r, tcp = 0;

        (void)yp_get_default_domain(&domainname);

        while ((c = getopt(argc, argv, "Th:d:")) != -1) {
                switch (c) {
                case 'T':
                        tcp = 1;
                        break;
                case 'd':
                        domainname = optarg;
                        break;

                case 'h':
                        hostname = optarg;
                        break;

                default:
                        usage();
                        /*NOTREACHED*/
                }
        }

        if (domainname == NULL)
                errx(1, "YP domain name not set");

        argc -= optind;
        argv += optind;

        if (argc != 1)
                usage();

        inmap = argv[0];

        if (hostname != NULL)
                r = get_remote_info(domainname, inmap, hostname,
                    &order, &master, tcp);
        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));

        (void)printf("Map %s has order number %d. %s", inmap, order,
            ctime((void *)&order));
        (void)printf("The master server is %s.\n", master);
        return 0;
}

static CLIENT *
mkclient(struct sockaddr_in *sin, unsigned long prog, unsigned long vers,
    int tcp)
{
        static struct timeval tv = { 10, 0 };
        int fd = RPC_ANYSOCK;

        if (tcp)
                return clnttcp_create(sin, prog, vers, &fd, 0, 0);
        else
                return clntudp_create(sin, prog, vers, tv, &fd);
}

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

        (void)memset(&rsrv_sin, 0, sizeof(rsrv_sin));
        rsrv_sin.sin_len = sizeof rsrv_sin;
        rsrv_sin.sin_family = AF_INET;

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

        client = mkclient(&rsrv_sin, YPPROG, YPVERS, tcp);
        if (client == NULL)
                errx(1, "clnt%s_create: no contact with host %s.",
                    tcp ? "tcp" : "udp", server);
        
        yprnk.domain = indomain;
        yprnk.map = inmap;

        (void)memset(&ypro, 0, sizeof(ypro));

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

        r = clnt_call(client, (unsigned int)YPPROC_ORDER, xdr_ypreq_nokey,
            &yprnk, 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, (void *)&ypro);

        r = ypprot_err(ypro.status);
        if (r == RPC_SUCCESS) {
                (void)memset(&yprm, 0, sizeof(yprm));

                r = clnt_call(client, (unsigned int)YPPROC_MASTER,
                    xdr_ypreq_nokey, &yprnk, 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, (void *)&yprm);
        }
        clnt_destroy(client);
        return r;
}

static void
usage(void)
{

        (void)fprintf(stderr,
            "Usage: %s [-T] [-h host] [-d domainname] mapname\n",
            getprogname());
        exit(1);
}