From e2d6e875f97e3d30dadb1fa3a9cfe307108c49ca Mon Sep 17 00:00:00 2001
From: Eric Kohl <eric.kohl@reactos.org>
Date: Sun, 7 Jun 2026 10:19:23 +0200
Subject: [PATCH] [NETCFGX][REACTOS] Add a second unknown method to the
 ITcpipProperties interface

This method is called by the 'interface ip set address' command from WinXP ifmon.dll.
---
 dll/win32/netcfgx/tcpipconf_notify.c | 23 +++++++++++++++++++++++
 sdk/include/reactos/netcfgn_undoc.h  |  2 ++
 2 files changed, 25 insertions(+)

diff --git a/dll/win32/netcfgx/tcpipconf_notify.c b/dll/win32/netcfgx/tcpipconf_notify.c
index d42094c5173..810af07511d 100644
--- a/dll/win32/netcfgx/tcpipconf_notify.c
+++ b/dll/win32/netcfgx/tcpipconf_notify.c
@@ -4635,12 +4635,35 @@ done:
     return hr;
 }
 
+HRESULT
+WINAPI
+ITcpipProperties_fnUnknown2(
+    ITcpipProperties *iface,
+    GUID *pAdapterName,
+    PTCPIP_PROPERTIES pProperties)
+{
+    HRESULT hr = S_OK;
+
+    ERR("ITcpipProperties_fnUnknown2(%s %p)\n", wine_dbgstr_guid(pAdapterName), pProperties);
+
+    if (pProperties)
+    {
+        ERR("pProperties->dwDhcp %lu\n", pProperties->dwDhcp);
+        ERR("pProperties->pszIpAddress %S\n", pProperties->pszIpAddress);
+        ERR("pProperties->pszSubnetMask %S\n", pProperties->pszSubnetMask);
+        ERR("pProperties->pszParameters %S\n", pProperties->pszParameters);
+    }
+
+    return hr;
+}
+
 static const ITcpipPropertiesVtbl vt_TcpipProperties =
 {
     ITcpipProperties_fnQueryInterface,
     ITcpipProperties_fnAddRef,
     ITcpipProperties_fnRelease,
     ITcpipProperties_fnUnknown1,
+    ITcpipProperties_fnUnknown2,
 };
 
 HRESULT
diff --git a/sdk/include/reactos/netcfgn_undoc.h b/sdk/include/reactos/netcfgn_undoc.h
index 5923dd2740e..5c0dda77d9e 100644
--- a/sdk/include/reactos/netcfgn_undoc.h
+++ b/sdk/include/reactos/netcfgn_undoc.h
@@ -17,6 +17,7 @@ DECLARE_INTERFACE_(ITcpipProperties, IUnknown)
     STDMETHOD_(ULONG,AddRef)(THIS)  PURE;
     STDMETHOD_(ULONG,Release) (THIS) PURE;
     STDMETHOD_(HRESULT,Unknown1)(THIS_ GUID *pAdapterName, PTCPIP_PROPERTIES *ppProperties) PURE;
+    STDMETHOD_(HRESULT,Unknown2)(THIS_ GUID *pAdapterName, PTCPIP_PROPERTIES pProperties) PURE;
     /* ??? */
 };
 #undef INTERFACE
@@ -29,6 +30,7 @@ EXTERN_C const IID IID_ITcpipProperties;
 #define ITcpipProperties_AddRef(p)             (p)->lpVtbl->AddRef(p)
 #define ITcpipProperties_Release(p)            (p)->lpVtbl->Release(p)
 #define ITcpipProperties_Unknown1(p,a,b)       (p)->lpVtbl->Unknown1(p,a,b)
+#define ITcpipProperties_Unknown2(p,a,b)       (p)->lpVtbl->Unknown2(p,a,b)
 /* ??? */
 #endif