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rcsid[] and sccsid[] and copyright[] are essentially unmaintained (and
unmaintainable).  these days, people use source.  these id's do not provide
any benefit, and do hurt the small install media
(the 33,000 line diff is essentially mechanical)
ok with the idea millert, ok dms

/*	$OpenBSD: ypwhich.c,v 1.20 2009/10/27 23:59:50 deraadt Exp $	*/
/*	$NetBSD: ypwhich.c,v 1.6 1996/05/13 02:43:48 thorpej 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/param.h>
#include <sys/types.h>
#include <sys/socket.h>

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

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

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

#include "yplib_host.h"

struct ypalias {
	char *alias, *name;
} ypaliases[] = {
	{ "passwd", "passwd.byname" },
	{ "group", "group.byname" },
	{ "networks", "networks.byaddr" },
	{ "hosts", "hosts.byaddr" },
	{ "protocols", "protocols.bynumber" },
	{ "services", "services.byname" },
	{ "aliases", "mail.aliases" },
	{ "ethers", "ethers.byname" },
};

int	bind_host(char *dom, struct sockaddr_in *sin);

static void
usage(void)
{
	fprintf(stderr,
	    "usage: ypwhich [-t] [-d domain] [[-h] host]\n"
	    "       ypwhich [-t] [-d domain] [-h host] -m [mname]\n"
	    "       ypwhich -x\n");
	exit(1);
}


/*
 * Like yp_bind except can query a specific host
 */
int
bind_host(char *dom, struct sockaddr_in *sin)
{
	struct hostent *hent = NULL;
	struct ypbind_resp ypbr;
	struct in_addr ss_addr;
	struct timeval tv;
	CLIENT *client;
	int sock, r;

	sock = RPC_ANYSOCK;
	tv.tv_sec = 15;
	tv.tv_usec = 0;
	client = clntudp_create(sin, YPBINDPROG, YPBINDVERS, tv, &sock);

	if (client == NULL) {
		fprintf(stderr, "ypwhich: host is not bound to a ypmaster\n");
		return YPERR_YPBIND;
	}

	tv.tv_sec = 5;
	tv.tv_usec = 0;

	r = clnt_call(client, YPBINDPROC_DOMAIN,
	    xdr_domainname, &dom, xdr_ypbind_resp, &ypbr, tv);
	if (r != RPC_SUCCESS) {
		fprintf(stderr, "can't clnt_call: %s\n",
		    yperr_string(YPERR_YPBIND));
		clnt_destroy(client);
		return YPERR_YPBIND;
	} else {
		if (ypbr.ypbind_status != YPBIND_SUCC_VAL) {
			fprintf(stderr, "can't yp_bind: Reason: %s\n",
			    yperr_string(ypbr.ypbind_status));
			clnt_destroy(client);
			return r;
		}
	}
	clnt_destroy(client);

	memmove(&ss_addr.s_addr, &ypbr.ypbind_resp_u.ypbind_bindinfo.ypbind_binding_addr,
	    sizeof (ss_addr));

	hent = gethostbyaddr((char *)&ss_addr.s_addr, sizeof(ss_addr.s_addr),
	    AF_INET);
	if (hent != NULL)
		printf("%s\n", hent->h_name);
	else
		printf("%s\n", inet_ntoa(ss_addr));

	return 0;
}

int
main(int argc, char *argv[])
{
	char *domain, *master, *map = NULL, *host = NULL;
	int notrans = 0, mode = 0, c, r, i;
	struct ypmaplist *ypml, *y;
	struct sockaddr_in sin;
	struct hostent *hent;
	CLIENT *client = NULL;

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

	while ((c = getopt(argc, argv, "xd:h:mt")) != -1)
		switch (c) {
		case 'x':
			for (i=0; i<sizeof ypaliases/sizeof ypaliases[0]; i++)
				printf("Use \"%s\" for \"%s\"\n",
				    ypaliases[i].alias, ypaliases[i].name);
			exit(0);
		case 'h':
			host = optarg;
			break;
		case 'd':
			domain = optarg;
			break;
		case 't':
			notrans++;
			break;
		case 'm':
			mode++;
			break;
		default:
			usage();
		}
	argc -= optind;
	argv += optind;

	if (mode == 0) {
		switch (argc) {
		case 0:
			memset(&sin, 0, sizeof sin);
			sin.sin_family = AF_INET;
			sin.sin_addr.s_addr = htonl(INADDR_LOOPBACK);

			if (bind_host(domain, &sin))
				exit(1);
			break;
		case 1:
			bzero(&sin, sizeof sin);
			sin.sin_family = AF_INET;
			if (inet_aton(argv[0], &sin.sin_addr) == 0) {
				hent = gethostbyname(argv[0]);
				if (!hent) {
					fprintf(stderr, "ypwhich: host %s unknown\n",
					    argv[0]);
					exit(1);
				}
				bcopy(hent->h_addr, &sin.sin_addr,
				    sizeof sin.sin_addr);
			}
			if (bind_host(domain, &sin))
				exit(1);
			break;
		default:
			usage();
		}
		exit(0);
	}

	if (argc > 1)
		usage();

	if (host != NULL)
		client = yp_bind_host(host, YPPROG, YPVERS, 0, 1);

	if (argv[0]) {
		map = argv[0];
		for (i=0; (!notrans) && i<sizeof ypaliases/sizeof ypaliases[0]; i++)
			if (strcmp(map, ypaliases[i].alias) == 0)
				map = ypaliases[i].name;

		if (host != NULL)
			r = yp_master_host(client, domain, map, &master);
		else
			r = yp_master(domain, map, &master);

		switch (r) {
		case 0:
			printf("%s\n", master);
			free(master);
			break;
		case YPERR_YPBIND:
			fprintf(stderr, "ypwhich: not running ypbind\n");
			exit(1);
		default:
			fprintf(stderr, "Can't find master for map %s. Reason: %s\n",
			    map, yperr_string(r));
			exit(1);
		}
		exit(0);
	}

	ypml = NULL;
	if (host != NULL)
		r = yp_maplist_host(client, domain, &ypml);
	else
		r = yp_maplist(domain, &ypml);

	r = 0;
	switch (r) {
	case 0:
		for (y = ypml; y; ) {
			ypml = y;
			if (host != NULL) {
				r = yp_master_host(client,
						   domain, ypml->map, &master);
			} else {
				r = yp_master(domain, ypml->map, &master);
			}
			switch (r) {
			case 0:
				printf("%s %s\n", ypml->map, master);
				free(master);
				break;
			default:
				fprintf(stderr,
				    "YP: can't find the master of %s: Reason: %s\n",
				    ypml->map, yperr_string(r));
				break;
			}
			y = ypml->next;
			free(ypml);
		}
		break;
	case YPERR_YPBIND:
		fprintf(stderr, "ypwhich: not running ypbind\n");
		exit(1);
	default:
		fprintf(stderr, "Can't get map list for domain %s. Reason: %s\n",
		    domain, yperr_string(r));
		exit(1);
	}
	exit(0);
}