Fix subscription custom configs ignoring custom config socks port (#10296)

* Fix subscription custom configs ignoring custom config socks port

Full Xray/sing-box configs imported from a subscription no longer got the
subscription's "Custom config socks port" (SubItem.PreSocksPort) after
eff5845 and 9638b4c. 7.24.4 and earlier copied it onto every imported
config, and the Clash, Hysteria2 and raw-file paths still do.

Without it, GetPreSocksItem builds no pre-socks core for these profiles,
so they cannot be used in TUN mode. Setting the port on the profile is
not a workaround, because every subscription update re-creates the
profiles.

* Add regression test for subscription custom config socks port

v2rayN/ServiceLib.Tests/Handler/ConfigHandlerCustomSubscriptionTests.cs

@@ -0,0 +1,42 @@
+using ServiceLib.Tests.CoreConfig;
+
+namespace ServiceLib.Tests.Handler;
+
+public class ConfigHandlerCustomSubscriptionTests
+{
+    private const string FullXrayConfigs = """
+        [
+          {"remarks":"custom-1","inbounds":[{"tag":"socks","listen":"127.0.0.1","port":10808,"protocol":"socks","settings":{"auth":"noauth","udp":true}}],"outbounds":[{"tag":"proxy","protocol":"vless","settings":{"vnext":[{"address":"127.0.0.1","port":443,"users":[{"id":"00000000-0000-0000-0000-000000000001","encryption":"none"}]}]},"streamSettings":{"network":"tcp"}}],"routing":{"domainStrategy":"AsIs","rules":[]}},
+          {"remarks":"custom-2","inbounds":[{"tag":"socks","listen":"127.0.0.1","port":10808,"protocol":"socks","settings":{"auth":"noauth","udp":true}}],"outbounds":[{"tag":"proxy","protocol":"vless","settings":{"vnext":[{"address":"127.0.0.1","port":443,"users":[{"id":"00000000-0000-0000-0000-000000000001","encryption":"none"}]}]},"streamSettings":{"network":"tcp"}}],"routing":{"domainStrategy":"AsIs","rules":[]}}
+        ]
+        """;
+
+    [Test]
+    public async Task AddBatchServers_FullConfigsFromSubscription_InheritSubscriptionPreSocksPort()
+    {
+        var config = CoreConfigTestFactory.CreateConfig();
+        CoreConfigTestFactory.BindAppManagerConfig(config);
+        SQLiteHelper.Instance.CreateTable<SubItem>();
+        SQLiteHelper.Instance.CreateTable<ProfileItem>();
+
+        var subId = $"sub-{Guid.NewGuid():N}";
+        await SQLiteHelper.Instance.ReplaceAsync(new SubItem
+        {
+            Id = subId,
+            Remarks = "sub",
+            Url = "http://127.0.0.1/sub",
+            PreSocksPort = 10808,
+        });
+
+        var count = await ConfigHandler.AddBatchServers(config, FullXrayConfigs, subId, true);
+        var profiles = await AppManager.Instance.ProfileItems(subId) ?? [];
+
+        await count.Should().BeEqualTo(2);
+        await profiles.Should().HaveCount(2);
+        foreach (var profile in profiles)
+        {
+            await profile.ConfigType.Should().BeEqualTo(EConfigType.Custom);
+            await profile.PreSocksPort.Should().BeEqualTo(10808);
+        }
+    }
+}

v2rayN/ServiceLib/Handler/ConfigHandler.cs

@@ -1778,7 +1778,7 @@ public static class ConfigHandler
         }
         if (lstProfiles.Count > 0)
         {
-            var count = await AddBatchCustomServers(config, lstProfiles, subid, isSub);
+            var count = await AddBatchCustomServers(config, lstProfiles, subid, isSub, subItem);
             if (count > 0)
             {
                 return count;
@@ -1824,7 +1824,7 @@ public static class ConfigHandler
 
         if (lstProfiles?.Count > 0)
         {
-            var count = await AddBatchCustomServers(config, lstProfiles, subid, isSub);
+            var count = await AddBatchCustomServers(config, lstProfiles, subid, isSub, subItem);
             if (count > 0)
             {
                 return count;
@@ -1838,7 +1838,8 @@ public static class ConfigHandler
         Config config,
         List<ProfileItem> lstProfiles,
         string subid,
-        bool isSub)
+        bool isSub,
+        SubItem? subItem)
     {
         var count = 0;
         foreach (var it in lstProfiles)
@@ -1848,6 +1849,7 @@ public static class ConfigHandler
 
             if (it.ConfigType == EConfigType.Custom)
             {
+                it.PreSocksPort = subItem?.PreSocksPort;
                 if (await AddCustomServer(config, it, true) == 0)
                 {
                     count++;