From f5e7e4c0d0730c07478ceb44358b6e76aad508b8 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=E9=99=88=E5=9B=BD=E4=BC=9F?= <366193849@qq.com>
Date: Fri, 26 Nov 2021 17:42:26 +0800
Subject: [PATCH] =?UTF-8?q?=E4=BD=BF=E7=94=A8Socket=E7=8A=B6=E6=80=81?=
 =?UTF-8?q?=E7=A0=81=E5=88=A4=E6=96=AD=E7=BD=91=E7=BB=9C=E9=97=AE=E9=A2=98?=
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---
 FastGithub.DomainResolve/IPAddressService.cs | 23 +++++++++++++++++---
 1 file changed, 20 insertions(+), 3 deletions(-)

diff --git a/FastGithub.DomainResolve/IPAddressService.cs b/FastGithub.DomainResolve/IPAddressService.cs
index 25e7ce2..eb3a4e2 100644
--- a/FastGithub.DomainResolve/IPAddressService.cs
+++ b/FastGithub.DomainResolve/IPAddressService.cs
@@ -5,7 +5,6 @@ using System.Collections.Generic;
 using System.Diagnostics;
 using System.Linq;
 using System.Net;
-using System.Net.NetworkInformation;
 using System.Net.Sockets;
 using System.Threading;
 using System.Threading.Tasks;
@@ -110,12 +109,12 @@ namespace FastGithub.DomainResolve
                 addressElapsed = new AddressElapsed(endPoint.Address, stopWatch.Elapsed);
                 return this.addressElapsedCache.Set(endPoint, addressElapsed, this.normaleElapsedExpiration);
             }
-            catch (Exception)
+            catch (Exception ex)
             {
                 cancellationToken.ThrowIfCancellationRequested();
 
                 addressElapsed = new AddressElapsed(endPoint.Address, TimeSpan.MaxValue);
-                var expiration = NetworkInterface.GetIsNetworkAvailable() ? this.normaleElapsedExpiration : this.brokeElapsedExpiration;
+                var expiration = IsLocalNetworkProblem(ex) ? this.brokeElapsedExpiration : this.normaleElapsedExpiration;
                 return this.addressElapsedCache.Set(endPoint, addressElapsed, expiration);
             }
             finally
@@ -123,5 +122,23 @@ namespace FastGithub.DomainResolve
                 stopWatch.Stop();
             }
         }
+
+        /// <summary>
+        /// 是否为本机网络问题
+        /// </summary>
+        /// <param name="ex"></param>
+        /// <returns></returns>
+        private static bool IsLocalNetworkProblem(Exception ex)
+        {
+            if (ex is not SocketException socketException)
+            {
+                return false;
+            }
+
+            var code = socketException.SocketErrorCode;
+            return code == SocketError.NetworkDown ||
+                code == SocketError.NetworkUnreachable ||
+                code == SocketError.HostUnreachable;
+        }
     }
 }