Pre-resolve to apply hosts (#7937)

v2rayN/ServiceLib/Common/Utils.cs

@@ -331,6 +331,32 @@ public class Utils
             .ToList();
     }
 
+    public static Dictionary<string, List<string>> ParseHostsToDictionary(string hostsContent)
+    {
+        var userHostsMap = hostsContent
+            .Split(new[] { '\r', '\n' }, StringSplitOptions.RemoveEmptyEntries)
+            .Select(line => line.Trim())
+            // skip full-line comments
+            .Where(line => !string.IsNullOrWhiteSpace(line) && !line.StartsWith("#"))
+            // strip inline comments (truncate at '#')
+            .Select(line =>
+            {
+                var index = line.IndexOf('#');
+                return index >= 0 ? line.Substring(0, index).Trim() : line;
+            })
+            // ensure line still contains valid parts
+            .Where(line => !string.IsNullOrWhiteSpace(line) && line.Contains(' '))
+            .Select(line => line.Split(new[] { ' ', '\t' }, StringSplitOptions.RemoveEmptyEntries))
+            .Where(parts => parts.Length >= 2)
+            .GroupBy(parts => parts[0])
+            .ToDictionary(
+                group => group.Key,
+                group => group.SelectMany(parts => parts.Skip(1)).ToList()
+            );
+
+        return userHostsMap;
+    }
+
     #endregion 转换函数
 
     #region 数据检查

v2rayN/ServiceLib/Services/CoreConfig/Singbox/SingboxDnsService.cs

@@ -94,17 +94,7 @@ public partial class CoreConfigSingboxService
 
         if (!simpleDNSItem.Hosts.IsNullOrEmpty())
         {
-            var userHostsMap = simpleDNSItem.Hosts
+            var userHostsMap = Utils.ParseHostsToDictionary(simpleDNSItem.Hosts);
-                .Split(new[] { '\r', '\n' }, StringSplitOptions.RemoveEmptyEntries)
-                .Select(line => line.Trim())
-                .Where(line => !string.IsNullOrWhiteSpace(line) && line.Contains(' '))
-                .Select(line => line.Split(new[] { ' ', '\t' }, StringSplitOptions.RemoveEmptyEntries))
-                .Where(parts => parts.Length >= 2)
-                .GroupBy(parts => parts[0])
-                .ToDictionary(
-                    group => group.Key,
-                    group => group.SelectMany(parts => parts.Skip(1)).ToList()
-                );
 
             foreach (var kvp in userHostsMap)
             {

v2rayN/ServiceLib/Services/CoreConfig/Singbox/SingboxRoutingService.cs

@@ -71,6 +71,31 @@ public partial class CoreConfigSingboxService
                 });
             }
 
+            var hostsDomains = new List<string>();
+            var systemHostsMap = Utils.GetSystemHosts();
+            foreach (var kvp in systemHostsMap)
+            {
+                hostsDomains.Add(kvp.Key);
+            }
+            var dnsItem = await AppManager.Instance.GetDNSItem(ECoreType.sing_box);
+            if (dnsItem == null || dnsItem.Enabled == false)
+            {
+                var simpleDNSItem = _config.SimpleDNSItem;
+                if (!simpleDNSItem.Hosts.IsNullOrEmpty())
+                {
+                    var userHostsMap = Utils.ParseHostsToDictionary(simpleDNSItem.Hosts);
+                    foreach (var kvp in userHostsMap)
+                    {
+                        hostsDomains.Add(kvp.Key);
+                    }
+                }
+            }
+            singboxConfig.route.rules.Add(new()
+            {
+                action = "resolve",
+                domain = hostsDomains,
+            });
+
             singboxConfig.route.rules.Add(new()
             {
                 outbound = Global.DirectTag,

v2rayN/ServiceLib/Services/CoreConfig/V2ray/V2rayDnsService.cs

@@ -261,17 +261,7 @@ public partial class CoreConfigV2rayService
 
         if (!simpleDNSItem.Hosts.IsNullOrEmpty())
         {
-            var userHostsMap = simpleDNSItem.Hosts
+            var userHostsMap = Utils.ParseHostsToDictionary(simpleDNSItem.Hosts);
-                .Split(new[] { '\r', '\n' }, StringSplitOptions.RemoveEmptyEntries)
-                .Select(line => line.Trim())
-                .Where(line => !string.IsNullOrWhiteSpace(line) && line.Contains(' '))
-                .Select(line => line.Split(new[] { ' ', '\t' }, StringSplitOptions.RemoveEmptyEntries))
-                .Where(parts => parts.Length >= 2)
-                .GroupBy(parts => parts[0])
-                .ToDictionary(
-                    group => group.Key,
-                    group => group.SelectMany(parts => parts.Skip(1)).ToList()
-                );
 
             foreach (var kvp in userHostsMap)
             {