From 715fcfe6dfc2be12eb6673d2a5e5672af18f9291 Mon Sep 17 00:00:00 2001
From: Ulrich Sibiller <uli42@gmx.de>
Date: Thu, 10 Aug 2017 00:50:27 +0200
Subject: Set NX_AGENT_VERSION property for root window

Fixes ArcticaProject/nx-libs#500
---
 nx-X11/programs/Xserver/hw/nxagent/NXproperty.c |  9 +++++++++
 nx-X11/programs/Xserver/hw/nxagent/NXwindow.c   |  4 ++++
 nx-X11/programs/Xserver/hw/nxagent/Window.c     | 16 ++++++++++++++++
 3 files changed, 29 insertions(+)

diff --git a/nx-X11/programs/Xserver/hw/nxagent/NXproperty.c b/nx-X11/programs/Xserver/hw/nxagent/NXproperty.c
index ee77eb64e..882dbe61b 100644
--- a/nx-X11/programs/Xserver/hw/nxagent/NXproperty.c
+++ b/nx-X11/programs/Xserver/hw/nxagent/NXproperty.c
@@ -169,6 +169,15 @@ ProcChangeProperty(ClientPtr client)
     }
 #endif
 
+#ifdef NXAGENT_SERVER
+    /* prevent clients from changing the NX_AGENT_VERSION property */
+    {
+      Atom prop = MakeAtom("NX_AGENT_VERSION", strlen("NX_AGENT_VERSION"), True);
+      if (stuff->property == prop)
+        return client->noClientException;
+    }
+#endif
+
     err = ChangeWindowProperty(pWin, stuff->property, stuff->type, (int)format,
 			       (int)mode, len, (void *)&stuff[1], TRUE);
     if (err != Success)
diff --git a/nx-X11/programs/Xserver/hw/nxagent/NXwindow.c b/nx-X11/programs/Xserver/hw/nxagent/NXwindow.c
index 7de25ca28..44d398304 100644
--- a/nx-X11/programs/Xserver/hw/nxagent/NXwindow.c
+++ b/nx-X11/programs/Xserver/hw/nxagent/NXwindow.c
@@ -134,6 +134,8 @@ extern Bool nxagentScreenTrap;
 
 WindowPtr nxagentRootTileWindow;
 
+extern void nxagentSetVersionProperty(WindowPtr pWin);
+
 void nxagentClearSplash(WindowPtr pW)
 {
     ScreenPtr pScreen;
@@ -293,6 +295,8 @@ InitRootWindow(WindowPtr pWin)
       nxagentPropagateArtsdProperties(pScreen, artsd_port);
     }
     #endif
+
+    nxagentSetVersionProperty(pWin);
 }
 
 /*****
diff --git a/nx-X11/programs/Xserver/hw/nxagent/Window.c b/nx-X11/programs/Xserver/hw/nxagent/Window.c
index 4cefd3f16..9afef8a0c 100644
--- a/nx-X11/programs/Xserver/hw/nxagent/Window.c
+++ b/nx-X11/programs/Xserver/hw/nxagent/Window.c
@@ -532,6 +532,22 @@ FIXME: Do all the windows for which nxagentWindowTopLevel(pWin)
   return True;
 }
 
+/* set the NX_AGENT_VERSION property for the given window (normally
+   the root window) */
+void nxagentSetVersionProperty(WindowPtr pWin)
+{
+  char *name = "NX_AGENT_VERSION";
+
+  Atom prop = MakeAtom(name, strlen(name), True);
+
+  if (ChangeWindowProperty(pWin, prop, XA_STRING, 8, PropModeReplace, strlen(NX_VERSION_CURRENT_STRING), NX_VERSION_CURRENT_STRING, True) != Success)
+    fprintf(stderr, "%s: Adding propery [%s], value [%s] failed.\n", __func__, name, NX_VERSION_CURRENT_STRING);
+#ifdef DEBUG
+  else
+    fprintf(stderr, "%s: Added property [%s], value [%s] for root window [%x].\n", __func__, name, NX_VERSION_CURRENT_STRING, pWin);
+#endif
+}
+
 Bool nxagentSomeWindowsAreMapped()
 {
   WindowPtr pWin = screenInfo.screens[0]->root -> firstChild;
-- 
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