add gatunad server and winforms client v1 (TCP-only)

Raw-Ethernet tunnel over ethertype 0x6969 to bypass WFP killswitches. Server (Rust, AF_PACKET + classic BPF) relays TCP to 127.0.0.1 services. Client (.NET 8 WinForms, SharpPcap/Npcap) discovers upstreams and exposes local loopback listeners. Wire protocol: 6-byte header, 7 frame types, MANIFEST with labeled upstreams. UDP types reserved, unimplemented.
2026-08-12 18:20:51 +00:00
parent 606d50432c
commit 25f00b0deb
16 changed files with 1852 additions and 1 deletions
@@ -0,0 +1,141 @@
+using SharpPcap.LibPcap;
+
+namespace gatuna_client;
+
+public partial class MainForm : Form
+{
+    readonly SessionManager _sessions = new();
+    readonly ComboBox _deviceBox = new();
+    readonly Button _discoverBtn = new();
+    readonly ListView _listView = new();
+    readonly Label _statusLabel = new();
+    TunnelLink? _link;
+
+    public MainForm()
+    {
+        Text = "gatuna";
+        Width = 520;
+        Height = 380;
+        FormBorderStyle = FormBorderStyle.FixedSingle;
+        MaximizeBox = false;
+        MinimizeBox = false;
+        StartPosition = FormStartPosition.CenterScreen;
+        InitializeComponents();
+
+        _sessions.Log += msg => this.Invoke(() => _statusLabel.Text = msg);
+        _sessions.ManifestReceived += entries => this.Invoke(() => PopulateList(entries));
+
+        foreach (var d in TunnelLink.ListDevices())
+            _deviceBox.Items.Add($"{d.Name} — {d.Interface?.FriendlyName ?? d.Interface?.Description}");
+        if (_deviceBox.Items.Count > 0)
+            _deviceBox.SelectedIndex = 0;
+    }
+
+    void InitializeComponents()
+    {
+        Controls.Add(new Label { Text = "Adapter:", Left = 12, Top = 12, AutoSize = true });
+
+        _deviceBox.Left = 70; _deviceBox.Top = 9;
+        _deviceBox.Width = 330; _deviceBox.DropDownStyle = ComboBoxStyle.DropDownList;
+        Controls.Add(_deviceBox);
+
+        _discoverBtn.Text = "Discover";
+        _discoverBtn.Left = 410; _discoverBtn.Top = 8; _discoverBtn.Width = 80;
+        _discoverBtn.Click += OnDiscover;
+        Controls.Add(_discoverBtn);
+
+        _listView.Left = 12; _listView.Top = 40;
+        _listView.Width = 478; _listView.Height = 250;
+        _listView.View = View.Details;
+        _listView.FullRowSelect = true;
+        _listView.CheckBoxes = true;
+        _listView.Columns.Add("ID", 36);
+        _listView.Columns.Add("Proto", 50);
+        _listView.Columns.Add("Port", 56);
+        _listView.Columns.Add("Label", 160);
+        _listView.Columns.Add("Mirror", 70);
+        _listView.ItemChecked += OnItemChecked;
+        Controls.Add(_listView);
+
+        _statusLabel.Left = 12; _statusLabel.Top = 304;
+        _statusLabel.Width = 478; _statusLabel.AutoEllipsis = true;
+        Controls.Add(_statusLabel);
+    }
+
+    void OnDiscover(object? s, EventArgs e)
+    {
+        if (_deviceBox.SelectedIndex < 0)
+        {
+            MessageBox.Show("Select a network adapter first.");
+            return;
+        }
+
+        if (_link != null)
+        {
+            _sessions.StopAll();
+            _sessions.DetachLink();
+            _link.Dispose();
+        }
+
+        var devices = TunnelLink.ListDevices();
+        var device = devices[_deviceBox.SelectedIndex];
+        _link = new TunnelLink(device);
+        _link.Log += msg => this.Invoke(() => _statusLabel.Text = msg);
+        _sessions.AttachLink(_link);
+        _link.Open();
+        _sessions.Discover();
+        _statusLabel.Text = "discovering...";
+    }
+
+    void PopulateList(UpstreamEntry[] entries)
+    {
+        _listView.BeginUpdate();
+        _listView.Items.Clear();
+        foreach (var up in entries)
+        {
+            var item = new ListViewItem(up.Id.ToString());
+            item.SubItems.Add(up.ProtoName);
+            item.SubItems.Add(up.Port.ToString());
+            item.SubItems.Add(up.Label ?? "");
+            item.SubItems.Add("");
+            item.Tag = up;
+            _listView.Items.Add(item);
+        }
+        _listView.EndUpdate();
+    }
+
+    void OnItemChecked(object? s, ItemCheckedEventArgs e)
+    {
+        if (e.Item.Tag is not UpstreamEntry up) return;
+        if (e.Item.Checked)
+        {
+            var port = _sessions.StartListener(up);
+            e.Item.SubItems[4].Text = port.ToString();
+        }
+        else
+        {
+            if (int.TryParse(e.Item.SubItems[4].Text, out var port) && port > 0)
+            {
+                _sessions.StopListener(port);
+                e.Item.SubItems[4].Text = "";
+            }
+        }
+    }
+
+    protected override void OnFormClosing(FormClosingEventArgs e)
+    {
+        if (e.CloseReason == CloseReason.UserClosing)
+        {
+            e.Cancel = true;
+            Hide();
+            return;
+        }
+        base.OnFormClosing(e);
+    }
+
+    public void Shutdown()
+    {
+        _sessions.Dispose();
+        _link?.Dispose();
+    }
+}