dnsinfo/dnsinfo_private.c

   1 /*
   2  * Copyright (c) 2004, 2005, 2007, 2009 Apple Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * This file contains Original Code and/or Modifications of Original Code
   7  * as defined in and that are subject to the Apple Public Source License
   8  * Version 2.0 (the 'License'). You may not use this file except in
   9  * compliance with the License. Please obtain a copy of the License at
  10  * http://www.opensource.apple.com/apsl/ and read it before using this
  11  * file.
  12  *
  13  * The Original Code and all software distributed under the License are
  14  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  15  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  16  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  17  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  18  * Please see the License for the specific language governing rights and
  19  * limitations under the License.
  20  *
  21  * @APPLE_LICENSE_HEADER_END@
  22  */
  23
  24 /*
  25  * Modification History
  26  *
  27  * March 9, 2004                Allan Nathanson <ajn@apple.com>
  28  * - initial revision
  29  */
  30
  31 #include <stdio.h>
  32 #include <stdlib.h>
  33 #include <mach/mach.h>
  34 #include <mach/mach_error.h>
  35 #include <servers/bootstrap.h>
  36
  37 #include "dnsinfo_private.h"
  38 #include "shared_dns_info_types.h"
  39
  40
  41 __private_extern__
  42 const char *
  43 _dns_configuration_notify_key()
  44 {
  45         return "com.apple.system.SystemConfiguration.dns_configuration";
  46 }
  47
  48
  49 __private_extern__
  50 mach_port_t
  51 _dns_configuration_server_port()
  52 {
  53         mach_port_t     server          = MACH_PORT_NULL;
  54         char            *server_name;
  55         kern_return_t   status;
  56
  57         server_name = getenv("DNS_SERVER");
  58         if (!server_name) {
  59                 server_name = DNS_SERVER;
  60         }
  61
  62         status = bootstrap_look_up(bootstrap_port, server_name, &server);
  63         switch (status) {
  64                 case BOOTSTRAP_SUCCESS :
  65                         /* service currently registered, "a good thing" (tm) */
  66                         break;
  67                 case BOOTSTRAP_UNKNOWN_SERVICE :
  68                         /* service not currently registered, try again later */
  69                         return MACH_PORT_NULL;
  70                 default :
  71                         fprintf(stderr,
  72                                 "could not lookup DNS configuration info service: %s\n",
  73                                 bootstrap_strerror(status));
  74                         return MACH_PORT_NULL;
  75         }
  76
  77         return server;
  78 }
  79