lib/libc/yp/yp_master.c

   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
  42 extern struct timeval _yplib_timeout;
  43 extern int _yplib_nerrs;
  44 extern int _yplib_bindtries;
  45
  46 #ifdef __weak_alias
  47 __weak_alias(yp_master,_yp_master)
  48 #endif
  49
  50 int
  51 yp_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
  68 again:
  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 }