mDNSShared/mDNSFeatures.h

   1 /*
   2  * Copyright (c) 2019 Apple Inc. All rights reserved.
   3  *
   4  * Licensed under the Apache License, Version 2.0 (the "License");
   5  * you may not use this file except in compliance with the License.
   6  * You may obtain a copy of the License at
   7  *
   8  *     http://www.apache.org/licenses/LICENSE-2.0
   9  *
  10  * Unless required by applicable law or agreed to in writing, software
  11  * distributed under the License is distributed on an "AS IS" BASIS,
  12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  13  * See the License for the specific language governing permissions and
  14  * limitations under the License.
  15  */
  16
  17 #ifndef __mDNSFeatures_h
  18 #define __mDNSFeatures_h
  19
  20 #if MDNSRESPONDER_PLATFORM_APPLE
  21 #include "ApplePlatformFeatures.h"
  22 #endif
  23
  24 // Common Features
  25
  26 #undef MDNSRESPONDER_PLATFORM_COMMON
  27 #define MDNSRESPONDER_PLATFORM_COMMON       1
  28
  29 // Feature: DNS Push
  30 // Radar:   <rdar://problem/23226275>
  31 // Enabled: Yes, for Apple.
  32
  33 #if !defined(MDNSRESPONDER_SUPPORTS_COMMON_DNS_PUSH)
  34     #if defined(MDNSRESPONDER_PLATFORM_APPLE) && MDNSRESPONDER_PLATFORM_APPLE
  35         #define MDNSRESPONDER_SUPPORTS_COMMON_DNS_PUSH      1
  36     #else
  37         #define MDNSRESPONDER_SUPPORTS_COMMON_DNS_PUSH      0
  38     #endif
  39 #endif
  40
  41 #define HAS_FEATURE_CAT(A, B)       A ## B
  42 #define HAS_FEATURE_CHECK_0         1
  43 #define HAS_FEATURE_CHECK_1         1
  44 #define HAS_FEATURE(X)              ((X) / HAS_FEATURE_CAT(HAS_FEATURE_CHECK_, X))
  45
  46 #define MDNSRESPONDER_SUPPORTS(PLATFORM, FEATURE) \
  47     (defined(MDNSRESPONDER_PLATFORM_ ## PLATFORM) && MDNSRESPONDER_PLATFORM_ ## PLATFORM && \
  48     HAS_FEATURE(MDNSRESPONDER_SUPPORTS_ ## PLATFORM ## _ ## FEATURE))
  49
  50 #endif  // __mDNSFeatures_h