text: /*
   * Copyright 2015 Facebook, Inc.
   *
   * Licensed under the Apache License, Version 2.0 (the "License");
   * you may not use this file except in compliance with the License.
   * You may obtain a copy of the License at
   *
   *   http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  
  #include <folly/test/SocketAddressTestHelper.h>
  
  #include <sys/socket.h>
  #include <netdb.h>
  #include <glog/logging.h>
  
  namespace folly {
  
  constexpr const char* SocketAddressTestHelper::kLoopbackAddrIPv4;
  constexpr const char* SocketAddressTestHelper::kLoopbackAddrIPv6;
  constexpr const char* SocketAddressTestHelper::kGooglePublicDnsAName;
  constexpr const char* SocketAddressTestHelper::kGooglePublicDnsBName;
  constexpr const char* SocketAddressTestHelper::kGooglePublicDnsAAddrIPv4;
  constexpr const char* SocketAddressTestHelper::kGooglePublicDnsBAddrIPv4;
  constexpr const char* SocketAddressTestHelper::kGooglePublicDnsAAddrIPv6;
  constexpr const char* SocketAddressTestHelper::kGooglePublicDnsBAddrIPv6;
  
  bool SocketAddressTestHelper::isIPv4Enabled() {
    return isFamilyOfAddrEnabled(kLoopbackAddrIPv4);
  }
  
  bool SocketAddressTestHelper::isIPv6Enabled() {
    return isFamilyOfAddrEnabled(kLoopbackAddrIPv6);
  }
  
  bool SocketAddressTestHelper::isFamilyOfAddrEnabled(const char* addr) {
    struct addrinfo hints {};
    hints.ai_flags = AI_ADDRCONFIG;
  
    struct addrinfo* resultsp = nullptr;
    int err = getaddrinfo(addr, nullptr, &hints, &resultsp);
    freeaddrinfo(resultsp);
    return !err;
  }
  
  }
  