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      1 /*	$NetBSD: yp_master.c,v 1.16 2024/01/03 18:41:53 christos Exp $	 */
      2 
      3 /*
      4  * Copyright (c) 1992, 1993 Theo de Raadt <deraadt (at) 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 1.16 2024/01/03 18:41:53 christos 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 
     42 #ifdef __weak_alias
     43 __weak_alias(yp_master,_yp_master)
     44 #endif
     45 
     46 int
     47 yp_master(const char *indomain, const char *inmap, char **outname)
     48 {
     49 	struct dom_binding *ysd;
     50 	struct ypresp_master yprm;
     51 	struct ypreq_nokey yprnk;
     52 	int r, nerrs = 0;
     53 
     54 	if (outname == NULL)
     55 		return YPERR_BADARGS;
     56 	*outname = NULL;
     57 
     58 	if (_yp_invalid_domain(indomain))
     59 		return YPERR_BADARGS;
     60 	if (inmap == NULL || *inmap == '\0'
     61 	    || strlen(inmap) > YPMAXMAP)
     62 		return YPERR_BADARGS;
     63 
     64 again:
     65 	if (_yp_dobind(indomain, &ysd) != 0)
     66 		return YPERR_DOMAIN;
     67 
     68 	yprnk.domain = indomain;
     69 	yprnk.map = inmap;
     70 
     71 	(void)memset(&yprm, 0, sizeof yprm);
     72 
     73 	r = clnt_call(ysd->dom_client, (rpcproc_t)YPPROC_MASTER,
     74 		      (xdrproc_t)xdr_ypreq_nokey, &yprnk,
     75 		      (xdrproc_t)xdr_ypresp_master, &yprm, _yplib_timeout);
     76 	if (r != RPC_SUCCESS) {
     77 		if (_yplib_bindtries <= 0 && ++nerrs == _yplib_nerrs) {
     78 			clnt_perror(ysd->dom_client, "yp_master: clnt_call");
     79 			nerrs = 0;
     80 		} else if (_yplib_bindtries > 0 && ++nerrs == _yplib_bindtries)
     81 			return YPERR_YPSERV;
     82 		ysd->dom_vers = -1;
     83 		goto again;
     84 	}
     85 	if (!(r = ypprot_err(yprm.status))) {
     86 		if ((*outname = strdup(yprm.master)) == NULL)
     87 			r = YPERR_RESRC;
     88 	}
     89 	xdr_free((xdrproc_t)xdr_ypresp_master, (char *)(void *)&yprm);
     90 	__yp_unbind(ysd);
     91 	if (r != 0) {
     92 		if (*outname) {
     93 			free(*outname);
     94 			*outname = NULL;
     95 		}
     96 	}
     97 	return r;
     98 }
     99