/*      $OpenBSD: ypset.c,v 1.20 2015/01/16 06:40:23 deraadt Exp $ */
/*      $NetBSD: ypset.c,v 1.8 1996/05/13 02:46:33 thorpej Exp $        */

/*-
 * SPDX-License-Identifier: BSD-2-Clause
 *
 * 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/param.h>
#include <sys/types.h>
#include <sys/socket.h>

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

#include <rpc/rpc.h>
#include <rpc/xdr.h>
#include <rpcsvc/yp.h>
#include <rpcsvc/ypclnt.h>
#include <arpa/inet.h>

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

static int
bind_tohost(struct sockaddr_in *sin, char *dom, char *server)
{
        struct ypbind_setdom ypsd;
        struct in_addr iaddr;
        struct hostent *hp;
        struct timeval tv;
        CLIENT *client;
        int sock, port, r;

        port = getrpcport(server, YPPROG, YPPROC_NULL, IPPROTO_UDP);
        if (port == 0)
                errx(1, "%s not running ypserv", server);
        port = htons(port);

        memset(&ypsd, 0, sizeof ypsd);

        if (inet_aton(server, &iaddr) == 0) {
                hp = gethostbyname(server);
                if (hp == NULL)
                        errx(1, "can't find address for %s", server);
                memmove(&iaddr.s_addr, hp->h_addr, sizeof(iaddr.s_addr));
        }
        ypsd.ypsetdom_domain = dom;
        bcopy(&iaddr.s_addr, &ypsd.ypsetdom_binding.ypbind_binding_addr,
            sizeof(ypsd.ypsetdom_binding.ypbind_binding_addr));
        bcopy(&port, &ypsd.ypsetdom_binding.ypbind_binding_port,
            sizeof(ypsd.ypsetdom_binding.ypbind_binding_port));
        ypsd.ypsetdom_vers = YPVERS;

        tv.tv_sec = 15;
        tv.tv_usec = 0;
        sock = RPC_ANYSOCK;
        client = clntudp_create(sin, YPBINDPROG, YPBINDVERS, tv, &sock);
        if (client == NULL) {
                warnx("can't yp_bind, reason: %s", yperr_string(YPERR_YPBIND));
                return (YPERR_YPBIND);
        }
        client->cl_auth = authunix_create_default();

        r = clnt_call(client, YPBINDPROC_SETDOM,
                (xdrproc_t)xdr_ypbind_setdom, &ypsd,
                (xdrproc_t)xdr_void, NULL, tv);
        if (r) {
                warnx("cannot ypset for domain %s on host %s: %s"
                " - make sure ypbind was started with -ypset or -ypsetme", dom,
                    server, clnt_sperrno(r));
                clnt_destroy(client);
                return (YPERR_YPBIND);
        }
        clnt_destroy(client);
        return (0);
}

int
main(int argc, char *argv[])
{
        struct sockaddr_in sin;
        struct hostent *hent;
        char *domainname;
        int c;

        yp_get_default_domain(&domainname);

        bzero(&sin, sizeof sin);
        sin.sin_family = AF_INET;
        sin.sin_addr.s_addr = htonl(INADDR_LOOPBACK);

        while ((c = getopt(argc, argv, "h:d:")) != -1)
                switch (c) {
                case 'd':
                        domainname = optarg;
                        break;
                case 'h':
                        if (inet_aton(optarg, &sin.sin_addr) == 0) {
                                hent = gethostbyname(optarg);
                                if (hent == NULL)
                                        errx(1, "host %s unknown\n", optarg);
                                bcopy(hent->h_addr, &sin.sin_addr,
                                    sizeof(sin.sin_addr));
                        }
                        break;
                default:
                        usage();
                }

        if (optind + 1 != argc)
                usage();

        if (bind_tohost(&sin, domainname, argv[optind]))
                exit(1);
        exit(0);
}