HardenedBSD/usr.bin/ypwhich/ypwhich.c

/*	$OpenBSD: ypwhich.c,v 1.23 2015/02/08 23:40:35 deraadt Exp $	*/
/*	$NetBSD: ypwhich.c,v 1.6 1996/05/13 02:43:48 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 <netinet/in.h>
#include <arpa/inet.h>

#include <ctype.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 "yplib_host.h"

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

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
 */
static 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) {
		warnx("host is not bound to a ypmaster");
		return (YPERR_YPBIND);
	}

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

	r = clnt_call(client, YPBINDPROC_DOMAIN,
		(xdrproc_t)xdr_domainname, &dom,
		(xdrproc_t)xdr_ypbind_resp, &ypbr, tv);
	if (r != RPC_SUCCESS) {
		warnx("can't clnt_call: %s", yperr_string(YPERR_YPBIND));
		clnt_destroy(client);
		return (YPERR_YPBIND);
	} else {
		if (ypbr.ypbind_status != YPBIND_SUCC_VAL) {
			warnx("can't yp_bind: reason: %s",
			    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 < nitems(ypaliases); i++)
				printf("\"%s\" is an alias for \"%s\"\n",
					ypaliases[i].alias,
					ypaliases[i].name);
			exit(0);
		case 'h':
			host = optarg;
			break;
		case 'd':
			domain = optarg;
			break;
		case 't':
			notrans = 1;
			break;
		case 'm':
			mode = 1;
			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) {
					errx(1, "host %s unknown",
					    argv[0]);
				}
			}
			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];
		if (notrans == 0) {
			for (i = 0; i < nitems(ypaliases); 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:
			errx(1, "not running ypbind");
		default:
			errx(1, "can't find master for map %s: reason: %s",
			    map, yperr_string(r));
		}
		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:
				warnx("can't find the master of %s: reason: %s",
				    ypml->map, yperr_string(r));
				break;
			}
			y = ypml->next;
			free(ypml);
		}
		break;
	case YPERR_YPBIND:
		errx(1, "not running ypbind");
	default:
		errx(1, "can't get map list for domain %s: reason: %s",
		    domain, yperr_string(r));
	}
	exit(0);
}