Add project files.

CustomServersClient.sln

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+
+Microsoft Visual Studio Solution File, Format Version 12.00
+# Visual Studio Version 16
+VisualStudioVersion = 16.0.30320.27
+MinimumVisualStudioVersion = 10.0.40219.1
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "CustomServersClient", "CustomServersClient\CustomServersClient.csproj", "{8424C5D8-334F-4CAB-B3C8-4D7635283B7F}"
+EndProject
+Global
+	GlobalSection(SolutionConfigurationPlatforms) = preSolution
+		Debug|Any CPU = Debug|Any CPU
+		Release|Any CPU = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(ProjectConfigurationPlatforms) = postSolution
+		{8424C5D8-334F-4CAB-B3C8-4D7635283B7F}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{8424C5D8-334F-4CAB-B3C8-4D7635283B7F}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{8424C5D8-334F-4CAB-B3C8-4D7635283B7F}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{8424C5D8-334F-4CAB-B3C8-4D7635283B7F}.Release|Any CPU.Build.0 = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(SolutionProperties) = preSolution
+		HideSolutionNode = FALSE
+	EndGlobalSection
+	GlobalSection(ExtensibilityGlobals) = postSolution
+		SolutionGuid = {5940C64A-7B4D-4DE5-8214-0D585143E960}
+	EndGlobalSection
+EndGlobal

CustomServersClient/CustomServerInfo.cs

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+namespace CustomServersClient
+{
+    public class CustomServerInfo
+    {
+        public string name;
+        public string ip;
+        public int port;
+
+        public int hash;
+
+        public CustomServerInfo(string name, string ip, int port)
+        {
+            this.name = name;
+            this.ip = ip;
+            this.port = port;
+
+            hash = name.GetHashCode() + ip.GetHashCode() + port.GetHashCode();
+        }
+
+        public override string ToString()
+        {
+            return $"{name} ({ip}:{port})";
+        }
+    }
+}

CustomServersClient/CustomServersClient.csproj

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+<?xml version="1.0" encoding="utf-8"?>
+<Project ToolsVersion="15.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
+  <Import Project="$(MSBuildExtensionsPath)\$(MSBuildToolsVersion)\Microsoft.Common.props" Condition="Exists('$(MSBuildExtensionsPath)\$(MSBuildToolsVersion)\Microsoft.Common.props')" />
+  <PropertyGroup>
+    <Configuration Condition=" '$(Configuration)' == '' ">Debug</Configuration>
+    <Platform Condition=" '$(Platform)' == '' ">AnyCPU</Platform>
+    <ProjectGuid>{8424C5D8-334F-4CAB-B3C8-4D7635283B7F}</ProjectGuid>
+    <OutputType>Library</OutputType>
+    <AppDesignerFolder>Properties</AppDesignerFolder>
+    <RootNamespace>CustomServersClient</RootNamespace>
+    <AssemblyName>CustomServersClient</AssemblyName>
+    <TargetFrameworkVersion>v4.7.2</TargetFrameworkVersion>
+    <FileAlignment>512</FileAlignment>
+    <Deterministic>true</Deterministic>
+  </PropertyGroup>
+  <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Debug|AnyCPU' ">
+    <DebugSymbols>true</DebugSymbols>
+    <DebugType>full</DebugType>
+    <Optimize>false</Optimize>
+    <OutputPath>bin\Debug\</OutputPath>
+    <DefineConstants>DEBUG;TRACE</DefineConstants>
+    <ErrorReport>prompt</ErrorReport>
+    <WarningLevel>4</WarningLevel>
+  </PropertyGroup>
+  <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Release|AnyCPU' ">
+    <DebugType>pdbonly</DebugType>
+    <Optimize>true</Optimize>
+    <OutputPath>bin\Release\</OutputPath>
+    <DefineConstants>TRACE</DefineConstants>
+    <ErrorReport>prompt</ErrorReport>
+    <WarningLevel>4</WarningLevel>
+  </PropertyGroup>
+  <ItemGroup>
+    <Reference Include="0Harmony">
+      <HintPath>D:\andru\Desktop\Among Us\BepInEx\core\0Harmony.dll</HintPath>
+      <Private>False</Private>
+    </Reference>
+    <Reference Include="Assembly-CSharp">
+      <HintPath>D:\andru\Desktop\Among Us\BepInEx\unhollowed\Assembly-CSharp.dll</HintPath>
+      <Private>False</Private>
+    </Reference>
+    <Reference Include="BepInEx.Core">
+      <HintPath>D:\andru\Desktop\Among Us\BepInEx\core\BepInEx.Core.dll</HintPath>
+      <Private>False</Private>
+    </Reference>
+    <Reference Include="BepInEx.IL2CPP">
+      <HintPath>D:\andru\Desktop\Among Us\BepInEx\core\BepInEx.IL2CPP.dll</HintPath>
+      <Private>False</Private>
+    </Reference>
+    <Reference Include="Il2Cppmscorlib">
+      <HintPath>D:\andru\Desktop\Among Us\BepInEx\unhollowed\Il2Cppmscorlib.dll</HintPath>
+      <Private>False</Private>
+    </Reference>
+    <Reference Include="Newtonsoft.Json, Version=6.0.0.0, Culture=neutral, PublicKeyToken=30ad4fe6b2a6aeed, processorArchitecture=MSIL">
+      <SpecificVersion>False</SpecificVersion>
+      <HintPath>D:\andru\Desktop\Among Us\BepInEx\core\Newtonsoft.Json.dll</HintPath>
+      <Private>False</Private>
+    </Reference>
+    <Reference Include="System" />
+    <Reference Include="System.Core" />
+    <Reference Include="System.Drawing" />
+    <Reference Include="System.Windows.Forms" />
+    <Reference Include="System.Xml.Linq" />
+    <Reference Include="System.Data.DataSetExtensions" />
+    <Reference Include="Microsoft.CSharp" />
+    <Reference Include="System.Data" />
+    <Reference Include="System.Net.Http" />
+    <Reference Include="System.Xml" />
+    <Reference Include="UnhollowerBaseLib">
+      <HintPath>D:\andru\Desktop\Among Us\BepInEx\core\UnhollowerBaseLib.dll</HintPath>
+      <Private>False</Private>
+    </Reference>
+    <Reference Include="UnityEngine">
+      <HintPath>D:\andru\Desktop\Among Us\BepInEx\unhollowed\UnityEngine.dll</HintPath>
+      <Private>False</Private>
+    </Reference>
+    <Reference Include="UnityEngine.CoreModule">
+      <HintPath>D:\andru\Desktop\Among Us\BepInEx\unhollowed\UnityEngine.CoreModule.dll</HintPath>
+      <Private>False</Private>
+    </Reference>
+    <Reference Include="UnityEngine.UI">
+      <HintPath>D:\andru\Desktop\Among Us\BepInEx\unhollowed\UnityEngine.UI.dll</HintPath>
+      <Private>False</Private>
+    </Reference>
+  </ItemGroup>
+  <ItemGroup>
+    <Compile Include="CustomServerInfo.cs" />
+    <Compile Include="CustomServersPlugin.cs" />
+    <Compile Include="CustomServersPatches.cs" />
+    <Compile Include="UI\EditServerForm.cs">
+      <SubType>Form</SubType>
+    </Compile>
+    <Compile Include="UI\EditServerForm.designer.cs">
+      <DependentUpon>EditServerForm.cs</DependentUpon>
+    </Compile>
+    <Compile Include="Properties\AssemblyInfo.cs" />
+    <Compile Include="UI\ServersManagementForm.cs">
+      <SubType>Form</SubType>
+    </Compile>
+    <Compile Include="UI\ServersManagementForm.designer.cs">
+      <DependentUpon>ServersManagementForm.cs</DependentUpon>
+    </Compile>
+  </ItemGroup>
+  <ItemGroup>
+    <EmbeddedResource Include="UI\EditServerForm.resx">
+      <DependentUpon>EditServerForm.cs</DependentUpon>
+    </EmbeddedResource>
+    <EmbeddedResource Include="UI\ServersManagementForm.resx">
+      <DependentUpon>ServersManagementForm.cs</DependentUpon>
+    </EmbeddedResource>
+  </ItemGroup>
+  <Import Project="$(MSBuildToolsPath)\Microsoft.CSharp.targets" />
+</Project>

CustomServersClient/CustomServersPatches.cs

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+using HarmonyLib;
+using InnerNet;
+using Newtonsoft.Json;
+using System.Collections.Generic;
+using System.IO;
+using System.Linq;
+using UnhollowerBaseLib;
+using CustomServersClient.UI;
+
+using RegionMenuLambda = RegionMenu.IOCEJPCJFKF;
+using RegionInfo = KMDGIDEDGGM;
+using ServerInfo = EEKGADNPDBH;
+
+namespace CustomServersClient
+{
+    public static class CustomServersPatches
+    {
+        public static List<CustomServerInfo> customServers = new List<CustomServerInfo>();
+
+        static RegionInfo[] _defaultRegions = new RegionInfo[3];
+
+        static bool _firstRun = true;
+        static ServersManagementForm _managementForm;
+
+        [HarmonyDebug]
+        [HarmonyPatch(typeof(InnerNetClient), nameof(InnerNetClient.SetEndpoint), typeof(string), typeof(ushort))]
+        public static class InnerNetClientSetEndPointPatch
+        {
+            public static bool Prefix(string EMFDKKLLHCL, ushort JOBBGKDMALK, ref InnerNetClient __instance)
+            {
+                var customServer = customServers.FirstOrDefault(x => x.ToString() == EMFDKKLLHCL);
+
+                if (customServer != default)
+                {
+                    CustomServersPlugin.Logger.LogDebug($"Setting IP and port for custom server \"{customServer.name}\"!");
+                    __instance.HECFEPIMCOE = customServer.ip;
+                    __instance.DNGDMFHEJBA = customServer.port;
+                }
+                else
+                {
+                    __instance.HECFEPIMCOE = EMFDKKLLHCL;
+                    __instance.DNGDMFHEJBA = JOBBGKDMALK;
+                }
+
+                return false;
+            }
+        }
+
+        [HarmonyDebug]
+        [HarmonyPatch(typeof(RegionMenu), nameof(RegionMenu.OnEnable))]
+        public static class RegionMenuOnEnablePatch
+        {
+            public static bool forceReloadServers;
+
+            public static bool Prefix(ref RegionMenu __instance)
+            {
+                ClearOnClickAction(__instance.ButtonPool);
+
+                if (_firstRun)
+                {
+                    for (int i = 0; i < 3; i++)
+                    {
+                        _defaultRegions[i] = ServerManager.DefaultRegions[i];
+                    }
+
+                    _firstRun = false;
+                }
+
+                Directory.CreateDirectory(CustomServersPlugin.userDataPath);
+
+                if (File.Exists(Path.Combine(CustomServersPlugin.userDataPath, CustomServersPlugin.customServersFilePath)))
+                {
+                    customServers = JsonConvert.DeserializeObject<List<CustomServerInfo>>(File.ReadAllText(Path.Combine(CustomServersPlugin.userDataPath, CustomServersPlugin.customServersFilePath)));
+                    CustomServersPlugin.Logger.LogDebug("Loaded custom servers list from file!");
+                }
+                else
+                {
+                    CustomServersPlugin.Logger.LogWarning("Custom servers list file not found!");
+                }
+
+                if (ServerManager.DefaultRegions.Count != 4 + customServers.Count || forceReloadServers)
+                {
+                    var regions = new RegionInfo[4 + customServers.Count];
+
+                    regions[0] = new RegionInfo("Manage servers...", "MANAGE_SERVERS", null);
+
+                    for (int i = 0; i < 3; i++)
+                    {
+                        regions[i + 1] = _defaultRegions[i];
+                    }
+
+                    for (int i = 0; i < customServers.Count; i++)
+                    {
+                        Il2CppReferenceArray<ServerInfo> servers = new ServerInfo[1] { new ServerInfo(customServers[i].name, customServers[i].ToString(), (ushort)customServers[i].port) };
+
+                        regions[i + 4] = new RegionInfo(customServers[i].name, "0", servers);
+                    }
+
+                    ServerManager.DefaultRegions = regions;
+                }
+
+                return true;
+            }
+
+            public static void ClearOnClickAction(ObjectPoolBehavior buttonPool)
+            {
+                foreach (var button in buttonPool.activeChildren)
+                {
+                    var buttonComponent = button.GetComponent<PassiveButton>();
+                    if (buttonComponent != null)
+                        buttonComponent.OnClick = new UnityEngine.UI.Button.ButtonClickedEvent();
+                }
+
+                foreach (var button in buttonPool.inactiveChildren)
+                {
+                    var buttonComponent = button.GetComponent<PassiveButton>();
+                    if (buttonComponent != null)
+                        buttonComponent.OnClick = new UnityEngine.UI.Button.ButtonClickedEvent();
+                }
+            }
+        }
+
+        [HarmonyDebug]
+        [HarmonyPatch(typeof(RegionMenuLambda), nameof(RegionMenuLambda.Method_Internal_Void_0))]
+        public static class RegionMenuChooseOptionPatch
+        {
+            public static bool Prefix(ref RegionMenuLambda __instance)
+            {
+                if (__instance.region.NCDMJOGPKOL == "MANAGE_SERVERS")
+                {
+                    if(_managementForm == null || _managementForm.IsDisposed)
+                        _managementForm = new ServersManagementForm();
+
+                    _managementForm.regionMenu = __instance.field_Public_RegionMenu_0;
+
+                    if (_managementForm.Visible)
+                        _managementForm.Focus();
+                    else
+                        _managementForm.ShowDialog();
+
+                    return false;
+                }
+                else
+                {
+                    return true;
+                }
+
+            }
+        }
+    }
+}

CustomServersClient/CustomServersPlugin.cs

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+using BepInEx;
+using BepInEx.IL2CPP;
+using HarmonyLib;
+using System.Reflection;
+
+namespace CustomServersClient
+{
+    [BepInPlugin("com.andruzzzhka.customserversclient", "Custom Servers Client", "1.0.0.0")]
+    public class CustomServersPlugin : BasePlugin
+    {
+        public const string userDataPath = "UserData";
+        public const string customServersFilePath = "CustomServers.json";
+
+        static internal BepInEx.Logging.ManualLogSource Logger;
+
+        static Harmony _harmony;
+
+        public override void Load()
+        {
+            Logger = Log;
+
+            _harmony = Harmony.CreateAndPatchAll(Assembly.GetExecutingAssembly(), "andruzzzhka.customserversclient");
+
+            Logger.LogDebug("Applied Harmony patches!");
+        }
+    }
+}

CustomServersClient/Properties/AssemblyInfo.cs

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+using System.Reflection;
+using System.Runtime.InteropServices;
+
+// General Information about an assembly is controlled through the following
+// set of attributes. Change these attribute values to modify the information
+// associated with an assembly.
+[assembly: AssemblyTitle("CustomServersClient")]
+[assembly: AssemblyDescription("")]
+[assembly: AssemblyConfiguration("")]
+[assembly: AssemblyCompany("")]
+[assembly: AssemblyProduct("CustomServersClient")]
+[assembly: AssemblyCopyright("Copyright ©  2020")]
+[assembly: AssemblyTrademark("")]
+[assembly: AssemblyCulture("")]
+
+// Setting ComVisible to false makes the types in this assembly not visible
+// to COM components.  If you need to access a type in this assembly from
+// COM, set the ComVisible attribute to true on that type.
+[assembly: ComVisible(false)]
+
+// The following GUID is for the ID of the typelib if this project is exposed to COM
+[assembly: Guid("8424c5d8-334f-4cab-b3c8-4d7635283b7f")]
+
+// Version information for an assembly consists of the following four values:
+//
+//      Major Version
+//      Minor Version
+//      Build Number
+//      Revision
+//
+// You can specify all the values or you can default the Build and Revision Numbers
+// by using the '*' as shown below:
+// [assembly: AssemblyVersion("1.0.*")]
+[assembly: AssemblyVersion("1.0.0.0")]
+[assembly: AssemblyFileVersion("1.0.0.0")]