feat: 支持导入系统hosts追加至dns设置

v2rayN/v2rayN/Handler/CoreConfigV2ray.cs

@@ -1,5 +1,7 @@
-using System.Net;
+using System.IO;
+using System.Net;
 using System.Net.NetworkInformation;
+using Newtonsoft.Json.Linq;
 using v2rayN.Base;
 using v2rayN.Mode;
 using v2rayN.Resx;
@@ -718,29 +720,50 @@ private int dns(V2rayConfig v2rayConfig)
                     outbound.settings.userLevel = 0;
                 }
 
-                var obj = Utils.ParseJson(normalDNS);
-                if (obj?.ContainsKey("servers") == true)
-                {
-                    v2rayConfig.dns = obj;
-                }
-                else
+                var obj = Utils.ParseJson(normalDNS) ?? new JObject();
+
+                if (!obj.ContainsKey("servers"))
                 {
                     List<string> servers = new();
-
                     string[] arrDNS = normalDNS.Split(',');
                     foreach (string str in arrDNS)
                     {
-                        //if (Utils.IsIP(str))
-                        //{
                         servers.Add(str);
-                        //}
                     }
-                    //servers.Add("localhost");
-                    v2rayConfig.dns = new Mode.Dns4Ray
+                    obj["servers"] = JArray.FromObject(servers);
+                }
+
+                if (item.useSystemHosts)
+                {
+                    var hostfile = @"C:\Windows\System32\drivers\etc\hosts" ;
+
+                    if (File.Exists(hostfile))
                     {
-                        servers = servers
-                    };
+                        var hosts = File.ReadAllText(hostfile).Replace("\r", "");
+                        var hostsList = hosts.Split(new[] { '\n' }, StringSplitOptions.RemoveEmptyEntries);
+
+                        // 获取系统hosts
+                        var systemHosts = new Dictionary<string, string>();
+                        foreach (var host in hostsList)
+                        {
+                            if (host.StartsWith("#")) continue;
+                            var hostItem = host.Split(new[] { ' ', '\t' }, StringSplitOptions.RemoveEmptyEntries);
+                            if (hostItem.Length < 2) continue;
+                            systemHosts.Add(hostItem[1], hostItem[0]);
+                        }
+
+                        // 追加至 dns 设置
+                        var normalHost = obj["hosts"] ?? new JObject();
+                        foreach (var host in systemHosts)
+                        {
+                            if (normalHost[host.Key] != null) continue;
+                            normalHost[host.Key] = host.Value;
+                        }
+                        obj["hosts"] = normalHost;
+                    }
                 }
+
+                v2rayConfig.dns = obj;
             }
             catch (Exception ex)
             {

v2rayN/v2rayN/Mode/DNSItem.cs

@@ -11,6 +11,7 @@ public class DNSItem
         public string remarks { get; set; }
         public bool enabled { get; set; } = true;
         public ECoreType coreType { get; set; }
+        public bool useSystemHosts { get; set; } = true;
         public string? normalDNS { get; set; }
         public string? tunDNS { get; set; }
         public string? domainStrategy4Freedom { get; set; }