現在使用中のネットワークアダプタを取得

Question

現在使用しているネットワークアダプタを取得しようとしています。 たとえば、ASP.NET CoreでWebリクエストを受け取っている場合、そのリクエストを処理するために使用されているアダプタを知りたいと思います。

ありがとうございます！

Answer 1

HttpContext.Connection.LocalIpAddress propertyを使用して、接続のローカル（サーバー）側のIPアドレスを取得し、同じアドレスがバインドされたNetworkInterfaceインスタンスを見つけることができます。 http://localhost:12345/Home/GetInterfaceInfoへのアクセス

using System.Linq; 
using System.Net.NetworkInformation; 
using Microsoft.AspNetCore.Mvc; 
using Newtonsoft.Json; 

namespace WebApplication1.Controllers 
{ 
    public class HomeController : Controller 
    { 
     public IActionResult GetInterfaceInfo() 
     { 
      var connectionLocalAddress = HttpContext.Connection.LocalIpAddress; 
      var connectionLocalInterface = NetworkInterface.GetAllNetworkInterfaces() 
       .Where(iface => iface.GetIPProperties().UnicastAddresses.Any(unicastInfo => unicastInfo.Address.Equals(connectionLocalAddress))) 
       .SingleOrDefault(); 
      var results = new { 
       NetworkInterface = connectionLocalInterface, 
       IPInterfaceProperties = connectionLocalInterface?.GetIPProperties(), 
       IPInterfaceStatistics = connectionLocalInterface?.GetIPStatistics(), 
       IPv4InterfaceStatistics = connectionLocalInterface?.GetIPv4Statistics() 
      }; 

      return Json(
       results, 
       new JsonSerializerSettings() { 
        ContractResolver = new IgnorePropertyExceptionsResolver(), 
        Formatting = Formatting.Indented 
       } 
      ); 
     } 
    } 
} 

が、その後生産...

{ 
    "NetworkInterface": { 
     "Id": "{-ABCD-EF01-2345-6789ABCDEF01}", 
     "Name": "Loopback Pseudo-Interface 1", 
     "Description": "Software Loopback Interface 1", 
     "NetworkInterfaceType": 24, 
     "OperationalStatus": 1, 
     "Speed": 1073741824, 
     "IsReceiveOnly": false, 
     "SupportsMulticast": true 
    }, 
    "IPInterfaceProperties": { 
     "IsDnsEnabled": false, 
     "IsDynamicDnsEnabled": true, 
     "DnsSuffix": "", 
     "AnycastAddresses": [], 
     "UnicastAddresses": [ 
      { 
       "Address": { 
        "AddressFamily": 23, 
        "ScopeId": 0, 
        "IsIPv6Multicast": false, 
        "IsIPv6LinkLocal": false, 
        "IsIPv6SiteLocal": false, 
        "IsIPv6Teredo": false, 
        "IsIPv4MappedToIPv6": false 
       }, 
       "IPv4Mask": { 
        "AddressFamily": 2, 
        "IsIPv6Multicast": false, 
        "IsIPv6LinkLocal": false, 
        "IsIPv6SiteLocal": false, 
        "IsIPv6Teredo": false, 
        "IsIPv4MappedToIPv6": false, 
        "Address": 0 
       }, 
       "PrefixLength": 128, 
       "IsTransient": false, 
       "IsDnsEligible": false, 
       "PrefixOrigin": 2, 
       "SuffixOrigin": 2, 
       "DuplicateAddressDetectionState": 4, 
       "AddressValidLifetime": 4294967295, 
       "AddressPreferredLifetime": 4294967295, 
       "DhcpLeaseLifetime": 1542939 
      }, 
      { 
       "Address": { 
        "AddressFamily": 2, 
        "IsIPv6Multicast": false, 
        "IsIPv6LinkLocal": false, 
        "IsIPv6SiteLocal": false, 
        "IsIPv6Teredo": false, 
        "IsIPv4MappedToIPv6": false, 
        "Address": 16777343 
       }, 
       "IPv4Mask": { 
        "AddressFamily": 2, 
        "IsIPv6Multicast": false, 
        "IsIPv6LinkLocal": false, 
        "IsIPv6SiteLocal": false, 
        "IsIPv6Teredo": false, 
        "IsIPv4MappedToIPv6": false, 
        "Address": 255 
       }, 
       "PrefixLength": 8, 
       "IsTransient": false, 
       "IsDnsEligible": false, 
       "PrefixOrigin": 2, 
       "SuffixOrigin": 2, 
       "DuplicateAddressDetectionState": 4, 
       "AddressValidLifetime": 4294967295, 
       "AddressPreferredLifetime": 4294967295, 
       "DhcpLeaseLifetime": 1542939 
      } 
     ], 
     "MulticastAddresses": [ 
      { 
       "Address": { 
        "AddressFamily": 23, 
        "ScopeId": 1, 
        "IsIPv6Multicast": true, 
        "IsIPv6LinkLocal": false, 
        "IsIPv6SiteLocal": false, 
        "IsIPv6Teredo": false, 
        "IsIPv4MappedToIPv6": false 
       }, 
       "IsTransient": false, 
       "IsDnsEligible": false, 
       "PrefixOrigin": 0, 
       "SuffixOrigin": 0, 
       "DuplicateAddressDetectionState": 0, 
       "AddressValidLifetime": 0, 
       "AddressPreferredLifetime": 0, 
       "DhcpLeaseLifetime": 0 
      }, 
      { 
       "Address": { 
        "AddressFamily": 2, 
        "IsIPv6Multicast": false, 
        "IsIPv6LinkLocal": false, 
        "IsIPv6SiteLocal": false, 
        "IsIPv6Teredo": false, 
        "IsIPv4MappedToIPv6": false, 
        "Address": 4211081199 
       }, 
       "IsTransient": false, 
       "IsDnsEligible": false, 
       "PrefixOrigin": 0, 
       "SuffixOrigin": 0, 
       "DuplicateAddressDetectionState": 0, 
       "AddressValidLifetime": 0, 
       "AddressPreferredLifetime": 0, 
       "DhcpLeaseLifetime": 0 
      } 
     ], 
     "DnsAddresses": [ 
      { 
       "AddressFamily": 23, 
       "ScopeId": 1, 
       "IsIPv6Multicast": false, 
       "IsIPv6LinkLocal": false, 
       "IsIPv6SiteLocal": true, 
       "IsIPv6Teredo": false, 
       "IsIPv4MappedToIPv6": false 
      }, 
      { 
       "AddressFamily": 23, 
       "ScopeId": 1, 
       "IsIPv6Multicast": false, 
       "IsIPv6LinkLocal": false, 
       "IsIPv6SiteLocal": true, 
       "IsIPv6Teredo": false, 
       "IsIPv4MappedToIPv6": false 
      }, 
      { 
       "AddressFamily": 23, 
       "ScopeId": 1, 
       "IsIPv6Multicast": false, 
       "IsIPv6LinkLocal": false, 
       "IsIPv6SiteLocal": true, 
       "IsIPv6Teredo": false, 
       "IsIPv4MappedToIPv6": false 
      } 
     ], 
     "GatewayAddresses": [], 
     "DhcpServerAddresses": [], 
     "WinsServersAddresses": [] 
    }, 
    "IPInterfaceStatistics": { 
     "OutputQueueLength": 0, 
     "BytesSent": 0, 
     "BytesReceived": 0, 
     "UnicastPacketsSent": 0, 
     "UnicastPacketsReceived": 0, 
     "NonUnicastPacketsSent": 0, 
     "NonUnicastPacketsReceived": 0, 
     "IncomingPacketsDiscarded": 0, 
     "OutgoingPacketsDiscarded": 0, 
     "IncomingPacketsWithErrors": 0, 
     "OutgoingPacketsWithErrors": 0, 
     "IncomingUnknownProtocolPackets": 0 
    }, 
    "IPv4InterfaceStatistics": { 
     "OutputQueueLength": 0, 
     "BytesSent": 0, 
     "BytesReceived": 0, 
     "UnicastPacketsSent": 0, 
     "UnicastPacketsReceived": 0, 
     "NonUnicastPacketsSent": 0, 
     "NonUnicastPacketsReceived": 0, 
     "IncomingPacketsDiscarded": 0, 
     "OutgoingPacketsDiscarded": 0, 
     "IncomingPacketsWithErrors": 0, 
     "OutgoingPacketsWithErrors": 0, 
     "IncomingUnknownProtocolPackets": 0 
    } 
} 

IgnorePropertyExceptionsResolverクラスがIgnoring class members that throw exceptions when serializing to JSONから来ているとこのようになります...私はこのクラスを使用

using System.Reflection; 
using Newtonsoft.Json; 
using Newtonsoft.Json.Serialization; 

namespace WebApplication1.Controllers 
{ 
    internal class IgnorePropertyExceptionsResolver : DefaultContractResolver 
    { 
     protected override JsonProperty CreateProperty(MemberInfo member, MemberSerialization memberSerialization) 
     { 
      var jsonProperty = base.CreateProperty(member, memberSerialization); 

      jsonProperty.ShouldSerialize = instance => { 
       try 
       { 
        var instanceProperty = (PropertyInfo) member; 

        if (instanceProperty.CanRead) 
        { 
         instanceProperty.GetValue(instance, null); 

         return true; 
        } 
       } 
       catch 
       { 
       } 

       return false; 
      }; 

      return jsonProperty; 
     } 
    } 
} 

理由はいくつかありますコレクションプロパティ内のIPAddressオブジェクトのうち、results.IPInterfacePropertiesが例外をスローするAddressプロパティがアクセスされたため、リゾルバは問題のあるプロパティを省略して出力を有効にします。もちろん、これらのオブジェクトに直接アクセスしてJSONに変換しないので、このデモコードではクラスが本当に必要になります。