rework wifi settings dialog.

fail gracefully if pcap isn't loaded successfully.

src/libui_sdl/DlgWifiSettings.cpp

@@ -30,6 +30,13 @@
 #include "DlgWifiSettings.h"
 
 
+#ifdef __WIN32__
+#define PCAP_NAME "winpcap/npcap"
+#else
+#define PCAP_NAME "libpcap"
+#endif // __WIN32__
+
+
 void ApplyNewSettings(int type);
 
 
@@ -43,6 +50,7 @@ bool haspcap;
 
 uiCheckbox* cbBindAnyAddr;
 
+uiLabel* lbAdapterList;
 uiCombobox* cmAdapterList;
 uiCheckbox* cbDirectLAN;
 
@@ -52,8 +60,30 @@ uiLabel* lbAdapterDNS0;
 uiLabel* lbAdapterDNS1;
 
 
+void UpdateAdapterControls()
+{
+    bool enable = haspcap && uiCheckboxChecked(cbDirectLAN);
+
+    if (enable)
+    {
+        uiControlEnable(uiControl(lbAdapterList));
+        uiControlEnable(uiControl(cmAdapterList));
+        uiControlEnable(uiControl(lbAdapterMAC));
+        uiControlEnable(uiControl(lbAdapterIP));
+    }
+    else
+    {
+        uiControlDisable(uiControl(lbAdapterList));
+        uiControlDisable(uiControl(cmAdapterList));
+        uiControlDisable(uiControl(lbAdapterMAC));
+        uiControlDisable(uiControl(lbAdapterIP));
+    }
+}
+
 void UpdateAdapterInfo()
 {
+    if (!haspcap) return;
+
     int sel = uiComboboxSelected(cmAdapterList);
     if (sel < 0 || sel >= LAN_PCap::NumAdapters) return;
     if (LAN_PCap::NumAdapters < 1) return;
@@ -71,7 +101,7 @@ void UpdateAdapterInfo()
             adapter->IP_v4[2], adapter->IP_v4[3]);
     uiLabelSetText(lbAdapterIP, tmp);
 
-    sprintf(tmp, "Primary DNS: %d.%d.%d.%d",
+    /*sprintf(tmp, "Primary DNS: %d.%d.%d.%d",
             adapter->DNS[0][0], adapter->DNS[0][1],
             adapter->DNS[0][2], adapter->DNS[0][3]);
     uiLabelSetText(lbAdapterDNS0, tmp);
@@ -79,7 +109,7 @@ void UpdateAdapterInfo()
     sprintf(tmp, "Secondary DNS: %d.%d.%d.%d",
             adapter->DNS[1][0], adapter->DNS[1][1],
             adapter->DNS[1][2], adapter->DNS[1][3]);
-    uiLabelSetText(lbAdapterDNS1, tmp);
+    uiLabelSetText(lbAdapterDNS1, tmp);*/
 }
 
 int OnCloseWindow(uiWindow* window, void* blarg)
@@ -88,6 +118,11 @@ int OnCloseWindow(uiWindow* window, void* blarg)
     return 1;
 }
 
+void OnDirectModeToggle(uiCheckbox* c, void* blarg)
+{
+    UpdateAdapterControls();
+}
+
 void OnAdapterSelect(uiCombobox* c, void* blarg)
 {
     UpdateAdapterInfo();
@@ -166,24 +201,25 @@ void Open()
         uiBox* in_ctrl = uiNewVerticalBox();
         uiGroupSetChild(grp, uiControl(in_ctrl));
 
-        lbl = uiNewLabel("Network adapter:");
-        uiBoxAppend(in_ctrl, uiControl(lbl), 0);
+        cbDirectLAN = uiNewCheckbox("Direct mode (requires " PCAP_NAME " and ethernet connection)");
+        uiCheckboxOnToggled(cbDirectLAN, OnDirectModeToggle, NULL);
+        uiBoxAppend(in_ctrl, uiControl(cbDirectLAN), 0);
+
+        lbAdapterList = uiNewLabel("Network adapter:");
+        uiBoxAppend(in_ctrl, uiControl(lbAdapterList), 0);
 
         cmAdapterList = uiNewCombobox();
         uiComboboxOnSelected(cmAdapterList, OnAdapterSelect, NULL);
         uiBoxAppend(in_ctrl, uiControl(cmAdapterList), 0);
 
-        lbAdapterMAC = uiNewLabel("MAC");
+        lbAdapterMAC = uiNewLabel("MAC: ??");
         uiBoxAppend(in_ctrl, uiControl(lbAdapterMAC), 0);
-        lbAdapterIP = uiNewLabel("IP");
+        lbAdapterIP = uiNewLabel("IP: ??");
         uiBoxAppend(in_ctrl, uiControl(lbAdapterIP), 0);
-        lbAdapterDNS0 = uiNewLabel("DNS0");
+        /*lbAdapterDNS0 = uiNewLabel("DNS0");
         uiBoxAppend(in_ctrl, uiControl(lbAdapterDNS0), 0);
         lbAdapterDNS1 = uiNewLabel("DNS1");
-        uiBoxAppend(in_ctrl, uiControl(lbAdapterDNS1), 0);
-
-        cbDirectLAN = uiNewCheckbox("Direct mode (requires ethernet connection)");
-        uiBoxAppend(in_ctrl, uiControl(cbDirectLAN), 0);
+        uiBoxAppend(in_ctrl, uiControl(lbAdapterDNS1), 0);*/
     }
 
     {
@@ -217,8 +253,10 @@ void Open()
     }
     uiComboboxSetSelected(cmAdapterList, sel);
     UpdateAdapterInfo();
+    UpdateAdapterControls();
 
     uiCheckboxSetChecked(cbDirectLAN, Config::DirectLAN);
+    if (!haspcap) uiControlDisable(uiControl(cbDirectLAN));
 
     uiControlShow(uiControl(win));
 }

src/libui_sdl/LAN_PCap.cpp

@@ -111,6 +111,8 @@ bool Init()
     PacketLen = 0;
     RXNum = 0;
 
+    NumAdapters = 0;
+
     for (int i = 0; PCapLibNames[i]; i++)
     {
         void* lib = SDL_LoadObject(PCapLibNames[i]);