yp_master.c revision 1.15 
1/*	$NetBSD: yp_master.c,v 1.15 2012/06/25 22:32:46 abs Exp $	 */
2
3/*
4 * Copyright (c) 1992, 1993 Theo de Raadt <deraadt@fsa.ca>
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 *    notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 *    notice, this list of conditions and the following disclaimer in the
14 *    documentation and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS
17 * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
18 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
20 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * SUCH DAMAGE.
27 */
28
29#include <sys/cdefs.h>
30#if defined(LIBC_SCCS) && !defined(lint)
31__RCSID("$NetBSD: yp_master.c,v 1.15 2012/06/25 22:32:46 abs Exp $");
32#endif
33
34#include "namespace.h"
35#include <string.h>
36#include <stdlib.h>
37#include <rpc/rpc.h>
38#include <rpcsvc/yp_prot.h>
39#include <rpcsvc/ypclnt.h>
40#include "local.h"
41
42extern struct timeval _yplib_timeout;
43extern int _yplib_nerrs;
44extern int _yplib_bindtries;
45
46#ifdef __weak_alias
47__weak_alias(yp_master,_yp_master)
48#endif
49
50int
51yp_master(const char *indomain, const char *inmap, char **outname)
52{
53	struct dom_binding *ysd;
54	struct ypresp_master yprm;
55	struct ypreq_nokey yprnk;
56	int r, nerrs = 0;
57
58	if (outname == NULL)
59		return YPERR_BADARGS;
60	*outname = NULL;
61
62	if (_yp_invalid_domain(indomain))
63		return YPERR_BADARGS;
64	if (inmap == NULL || *inmap == '\0'
65	    || strlen(inmap) > YPMAXMAP)
66		return YPERR_BADARGS;
67
68again:
69	if (_yp_dobind(indomain, &ysd) != 0)
70		return YPERR_DOMAIN;
71
72	yprnk.domain = indomain;
73	yprnk.map = inmap;
74
75	(void)memset(&yprm, 0, sizeof yprm);
76
77	r = clnt_call(ysd->dom_client, (rpcproc_t)YPPROC_MASTER,
78		      (xdrproc_t)xdr_ypreq_nokey, &yprnk,
79		      (xdrproc_t)xdr_ypresp_master, &yprm, _yplib_timeout);
80	if (r != RPC_SUCCESS) {
81		if (_yplib_bindtries <= 0 && ++nerrs == _yplib_nerrs) {
82			clnt_perror(ysd->dom_client, "yp_master: clnt_call");
83			nerrs = 0;
84		} else if (_yplib_bindtries > 0 && ++nerrs == _yplib_bindtries)
85			return YPERR_YPSERV;
86		ysd->dom_vers = -1;
87		goto again;
88	}
89	if (!(r = ypprot_err(yprm.status))) {
90		if ((*outname = strdup(yprm.master)) == NULL)
91			r = YPERR_RESRC;
92	}
93	xdr_free((xdrproc_t)xdr_ypresp_master, (char *)(void *)&yprm);
94	__yp_unbind(ysd);
95	if (r != 0) {
96		if (*outname) {
97			free(*outname);
98			*outname = NULL;
99		}
100	}
101	return r;
102}
103