dns日志

FastGithub.Dns/DnsInterceptor.cs

@@ -22,7 +22,7 @@ namespace FastGithub.Dns
         private const string DNS_FILTER = "udp.DstPort == 53";
         private readonly FastGithubConfig fastGithubConfig;
         private readonly ILogger<DnsInterceptor> logger;
-        private readonly TimeSpan ttl = TimeSpan.FromMinutes(1d);
+        private readonly TimeSpan ttl = TimeSpan.FromMinutes(2d);
 
         /// <summary>
         /// 刷新DNS缓存
@@ -118,14 +118,14 @@ namespace FastGithub.Dns
             }
 
             // 反转ip
-            var sourceAddress = ipPacket.SourceAddress;
-            ipPacket.SourceAddress = ipPacket.DestinationAddress;
-            ipPacket.DestinationAddress = sourceAddress;
+            var destAddress = ipPacket.DestinationAddress;
+            ipPacket.DestinationAddress = ipPacket.SourceAddress;
+            ipPacket.SourceAddress = destAddress;
 
             // 反转端口
-            var sourcePort = udpPacket.SourcePort;
-            udpPacket.SourcePort = udpPacket.DestinationPort;
-            udpPacket.DestinationPort = sourcePort;
+            var destPort = udpPacket.DestinationPort;
+            udpPacket.DestinationPort = udpPacket.SourcePort;
+            udpPacket.SourcePort = destPort;
 
             // 设置dns响应
             var response = Response.FromRequest(request);
@@ -146,6 +146,8 @@ namespace FastGithub.Dns
             {
                 winDivertAddress.Direction = WinDivertDirection.Inbound;
             }
+
+            this.logger.LogInformation($"已拦截dns查询{domain}并伪造响应内容为{IPAddress.Loopback}");
         }
     }
 }

FastGithub.HttpServer/HttpProxyMiddleware.cs

@@ -49,26 +49,11 @@ namespace FastGithub.HttpServer
         {
             if (context.Request.Method == HttpMethods.Get && context.Request.Path == "/proxy.pac")
             {
-                var buidler = new StringBuilder();
-                buidler.AppendLine("function FindProxyForURL(url, host){");
-                buidler.AppendLine($"    var proxy = 'PROXY {context.Request.Host}';");
-                foreach (var domain in this.fastGithubConfig.GetDomainPatterns())
-                {
-                    buidler.AppendLine($"    if (shExpMatch(host, '{domain}')) return proxy;");
-                }
-                buidler.AppendLine("    return 'DIRECT';");
-                buidler.AppendLine("}");
-                var pacString = buidler.ToString();
-
                 context.Response.ContentType = "application/x-ns-proxy-autoconfig";
+                var pacString = this.GetProxyPacString(context);
                 await context.Response.WriteAsync(pacString);
             }
-            else if (context.Request.Method != HttpMethods.Connect)
-            {
-                var destinationPrefix = $"{context.Request.Scheme}://{context.Request.Host}";
-                await this.httpForwarder.SendAsync(context, destinationPrefix, this.httpClient);
-            }
-            else
+            else if (context.Request.Method == HttpMethods.Connect)
             {
                 var endpoint = await this.GetTargetEndPointAsync(context.Request);
                 using var targetSocket = new Socket(SocketType.Stream, ProtocolType.Tcp);
@@ -87,6 +72,31 @@ namespace FastGithub.HttpServer
                     await Task.WhenAny(task1, task2);
                 }
             }
+            else
+            {
+                var destinationPrefix = $"{context.Request.Scheme}://{context.Request.Host}";
+                await this.httpForwarder.SendAsync(context, destinationPrefix, this.httpClient);
+            }
+        }
+
+
+        /// <summary>
+        /// 获取proxypac脚本
+        /// </summary>
+        /// <param name="context"></param>
+        /// <returns></returns>
+        private string GetProxyPacString(HttpContext context)
+        {
+            var buidler = new StringBuilder();
+            buidler.AppendLine("function FindProxyForURL(url, host){");
+            buidler.AppendLine($"    var proxy = 'PROXY {context.Request.Host}';");
+            foreach (var domain in this.fastGithubConfig.GetDomainPatterns())
+            {
+                buidler.AppendLine($"    if (shExpMatch(host, '{domain}')) return proxy;");
+            }
+            buidler.AppendLine("    return 'DIRECT';");
+            buidler.AppendLine("}");
+            return buidler.ToString();
         }
 
         /// <summary>
@@ -105,12 +115,13 @@ namespace FastGithub.HttpServer
                 return new IPEndPoint(address, targetPort);
             }
 
+            // 不关心的域名，直接使用系统dns
             if (this.fastGithubConfig.IsMatch(targetHost) == false)
             {
                 return new DnsEndPoint(targetHost, targetPort);
             }
 
-            // https，走反向代理中间人
+            // 目标端口为443，走https代理中间人
             if (targetPort == HTTPS_PORT)
             {
                 return new IPEndPoint(IPAddress.Loopback, HttpsReverseProxyPort.Value);