usr/src/lib/libc/port/nsl/rpcdname.c

   1 /*
   2  * CDDL HEADER START
   3  *
   4  * The contents of this file are subject to the terms of the
   5  * Common Development and Distribution License, Version 1.0 only
   6  * (the "License").  You may not use this file except in compliance
   7  * with the License.
   8  *
   9  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
  10  * or http://www.opensolaris.org/os/licensing.
  11  * See the License for the specific language governing permissions
  12  * and limitations under the License.
  13  *
  14  * When distributing Covered Code, include this CDDL HEADER in each
  15  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
  16  * If applicable, add the following below this CDDL HEADER, with the
  17  * fields enclosed by brackets "[]" replaced with your own identifying
  18  * information: Portions Copyright [yyyy] [name of copyright owner]
  19  *
  20  * CDDL HEADER END
  21  */
  22
  23 /*
  24  * Copyright 2005 Sun Microsystems, Inc.  All rights reserved.
  25  * Use is subject to license terms.
  26  */
  27 /* Copyright (c) 1983, 1984, 1985, 1986, 1987, 1988, 1989 AT&T */
  28 /* All Rights Reserved */
  29 /*
  30  * Portions of this source code were derived from Berkeley
  31  * 4.3 BSD under license from the Regents of the University of
  32  * California.
  33  */
  34
  35 #pragma ident   "%Z%%M% %I%     %E% SMI"
  36
  37 /*
  38  * rpcdname.c
  39  * Gets the default domain name
  40  */
  41 #include "mt.h"
  42 #include "rpc_mt.h"
  43 #include <sys/types.h>
  44 #include <sys/time.h>
  45 #include <string.h>
  46 #include <syslog.h>
  47
  48 extern int getdomainname();
  49 extern char *strdup();
  50 static char *default_domain = 0;
  51
  52 static char *
  53 get_default_domain(void)
  54 {
  55         char temp[256];
  56         extern mutex_t dname_lock;
  57
  58 /* VARIABLES PROTECTED BY dname_lock: default_domain */
  59
  60         (void) mutex_lock(&dname_lock);
  61         if (default_domain) {
  62                 (void) mutex_unlock(&dname_lock);
  63                 return (default_domain);
  64         }
  65         if (getdomainname(temp, (size_t)sizeof (temp)) < 0) {
  66                 (void) mutex_unlock(&dname_lock);
  67                 return (0);
  68         }
  69         if ((int)strlen(temp) > 0) {
  70                 default_domain = strdup(temp);
  71                 if (default_domain == NULL) {
  72                         syslog(LOG_ERR, "get_default_domain : strdup failed.");
  73                         (void) mutex_unlock(&dname_lock);
  74                         return (0);
  75                 }
  76         }
  77         (void) mutex_unlock(&dname_lock);
  78         return (default_domain);
  79 }
  80
  81 /*
  82  * This is a wrapper for the system call getdomainname which returns a
  83  * ypclnt.h error code in the failure case.  It also checks to see that
  84  * the domain name is non-null, knowing that the null string is going to
  85  * get rejected elsewhere in the yp client package.
  86  */
  87 int
  88 __rpc_get_default_domain(char **domain)
  89 {
  90         if ((*domain = get_default_domain()) != 0)
  91                 return (0);
  92         return (-1);
  93 }