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      1 /*
      2  * Copyright (c) 2019-2024 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  *     https://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 #include "general.h"
     21 
     22 #define HAS_FEATURE_CAT(A, B)       A ## B
     23 #define HAS_FEATURE_CHECK_0         1
     24 #define HAS_FEATURE_CHECK_1         1
     25 #define HAS_FEATURE(X)              ((X) / HAS_FEATURE_CAT(HAS_FEATURE_CHECK_, X))
     26 
     27 #define MDNSRESPONDER_SUPPORTS(PLATFORM, FEATURE) \
     28     (MDNSRESPONDER_PLATFORM_ ## PLATFORM && \
     29     HAS_FEATURE(MDNSRESPONDER_SUPPORTS_ ## PLATFORM ## _ ## FEATURE))
     30 
     31 #ifndef MDNSRESPONDER_PLATFORM_APPLE
     32 #define MDNSRESPONDER_PLATFORM_APPLE        0
     33 #endif
     34 
     35 #if MDNSRESPONDER_PLATFORM_APPLE
     36 #include "ApplePlatformFeatures.h"
     37 #endif
     38 
     39 // Common Features
     40 
     41 #undef MDNSRESPONDER_PLATFORM_COMMON
     42 #define MDNSRESPONDER_PLATFORM_COMMON       1
     43 
     44 // Feature: DNS Push
     45 // Radar:   <rdar://119684505>
     46 // Enabled: No.
     47 
     48 #if !defined(MDNSRESPONDER_SUPPORTS_COMMON_DNS_PUSH)
     49     #define MDNSRESPONDER_SUPPORTS_COMMON_DNS_PUSH 0
     50 #endif
     51 
     52 // Feature: DNS LLQ
     53 // Radar:   <rdar://problem/83483790>
     54 // Enabled: No.
     55 
     56 #if !defined(MDNSRESPONDER_SUPPORTS_COMMON_DNS_LLQ)
     57     #if MDNSRESPONDER_PLATFORM_APPLE
     58         #define MDNSRESPONDER_SUPPORTS_COMMON_DNS_LLQ 0
     59     #else
     60         #define MDNSRESPONDER_SUPPORTS_COMMON_DNS_LLQ 0
     61     #endif
     62 #endif
     63 
     64 // Feature: Use Multicast DNS to discover the local DNS server that is authoritative for a given domain.
     65 // Radar:   <rdar://69957139>
     66 // Enabled: No
     67 
     68 #if !defined(MDNSRESPONDER_SUPPORTS_COMMON_LOCAL_DNS_RESOLVER_DISCOVERY)
     69     #if MDNSRESPONDER_PLATFORM_APPLE
     70         #define MDNSRESPONDER_SUPPORTS_COMMON_LOCAL_DNS_RESOLVER_DISCOVERY 1
     71     #else
     72         #define MDNSRESPONDER_SUPPORTS_COMMON_LOCAL_DNS_RESOLVER_DISCOVERY 0
     73     #endif
     74 #endif
     75 
     76 // Feature: DNS-SD Sleep Proxy Service (SPS) client support
     77 // Radar:   No known radar.
     78 // Enabled: Compiled for all platforms, except iOS and watchOS (rdar://112912605), and macOS (rdar://118002582).
     79 
     80 #if !defined(MDNSRESPONDER_SUPPORTS_COMMON_SPS_CLIENT)
     81     #if MDNS_OS(iOS) || MDNS_OS(watchOS) || MDNS_OS(macOS)
     82         #define MDNSRESPONDER_SUPPORTS_COMMON_SPS_CLIENT 0
     83     #else
     84         #define MDNSRESPONDER_SUPPORTS_COMMON_SPS_CLIENT 1
     85     #endif
     86 #endif
     87 
     88 #if MDNSRESPONDER_SUPPORTS(COMMON, DNS_PUSH)
     89     #if MDNSRESPONDER_SUPPORTS(APPLE, DNS_PUSH)
     90         #error "MDNSRESPONDER_SUPPORTS(COMMON, DNS_PUSH) and MDNSRESPONDER_SUPPORTS(APPLE, DNS_PUSH) shouldn't be enabled at the same time."
     91     #endif
     92 #endif
     93 
     94 #endif  // __mDNSFeatures_h
     95