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

/*
* Copyright (c) 1992, 1993 Theo de Raadt <[email protected]>
* 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);
}

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