dnsinfo/dnsinfo_server.c

   1 /*
   2  * Copyright (c) 2004-2008 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 <notify.h>
  32 #include <sysexits.h>
  33 #include <syslog.h>
  34 #include <unistd.h>
  35 #include <sys/types.h>
  36 #include <servers/bootstrap.h>
  37 #include <mach/mach.h>
  38 #include <mach/mach_error.h>
  39 #include <bsm/libbsm.h>
  40
  41 #include <CoreFoundation/CoreFoundation.h>
  42 #include <SystemConfiguration/SCPrivate.h>
  43
  44 #include "dnsinfo_server.h"
  45 #include "dnsinfo_private.h"
  46
  47 static  CFDataRef       shared_dns_info         = NULL;
  48
  49 __private_extern__
  50 kern_return_t
  51 _shared_dns_infoGet(mach_port_t server, dnsDataOut_t *dataRef, mach_msg_type_number_t *dataLen)
  52 {
  53         *dataRef = NULL;
  54         *dataLen = 0;
  55
  56         if (shared_dns_info != NULL) {
  57                 if (!_SCSerializeData(shared_dns_info, (void **)dataRef, (CFIndex *)dataLen)) {
  58                         return KERN_FAILURE;
  59                 }
  60         }
  61
  62         return KERN_SUCCESS;
  63 }
  64
  65
  66 __private_extern__
  67 kern_return_t
  68 _shared_dns_infoSet(mach_port_t                 server,
  69                     dnsData_t                   dataRef,
  70                     mach_msg_type_number_t      dataLen,
  71                     audit_token_t               audit_token)
  72 {
  73         uid_t           euid            = 0;
  74         CFDataRef       new_dns_info    = NULL;
  75         const char      *notify_key;
  76
  77         if ((dataRef != NULL) && (dataLen > 0)) {
  78                 if (!_SCUnserializeData(&new_dns_info, (void *)dataRef, dataLen)) {
  79                         goto error;
  80                 }
  81         }
  82
  83         audit_token_to_au32(audit_token,
  84                             NULL,       // auidp
  85                             &euid,      // euid
  86                             NULL,       // egid
  87                             NULL,       // ruid
  88                             NULL,       // rgid
  89                             NULL,       // pid
  90                             NULL,       // asid
  91                             NULL);      // tid
  92         if (euid != 0) {
  93                 goto error;
  94         }
  95
  96         if ((shared_dns_info != NULL) &&
  97             (new_dns_info    != NULL) &&
  98             CFEqual(shared_dns_info, new_dns_info)) {
  99                 CFRelease(new_dns_info);
 100                 return KERN_SUCCESS;
 101         }
 102
 103         if (shared_dns_info != NULL) CFRelease(shared_dns_info);
 104         shared_dns_info = new_dns_info;
 105
 106         notify_key = _dns_configuration_notify_key();
 107         if (notify_key != NULL) {
 108                 uint32_t        status;
 109
 110                 status = notify_post(notify_key);
 111                 if (status != NOTIFY_STATUS_OK) {
 112                         SCLog(TRUE, LOG_ERR, CFSTR("notify_post() failed: %d"), status);
 113                         // notification posting failures are non-fatal
 114                 }
 115         }
 116
 117         return KERN_SUCCESS;
 118
 119     error :
 120
 121         if (new_dns_info != NULL)    CFRelease(new_dns_info);
 122         return KERN_FAILURE;
 123 }