From 3d76ed45e22f7a71de3ca0e918da01bb5936f0cf Mon Sep 17 00:00:00 2001
From: Ulrich Sibiller <uli42@gmx.de>
Date: Mon, 18 Oct 2021 22:11:26 +0200
Subject: nxagent: extend x2go check

do not only depend on the program name but also check the DISPLAY
variable and the command line parameters. This mainly helps for testing
some special constructs when you want to use an alternative nxagent
for x2go connections.
---
 nx-X11/programs/Xserver/hw/nxagent/Args.c |  2 +-
 nx-X11/programs/Xserver/hw/nxagent/Init.c | 38 ++++++++++++++++++++++++++++---
 nx-X11/programs/Xserver/hw/nxagent/Init.h |  2 +-
 3 files changed, 37 insertions(+), 5 deletions(-)

diff --git a/nx-X11/programs/Xserver/hw/nxagent/Args.c b/nx-X11/programs/Xserver/hw/nxagent/Args.c
index ea17e4813..e2dc8c083 100644
--- a/nx-X11/programs/Xserver/hw/nxagent/Args.c
+++ b/nx-X11/programs/Xserver/hw/nxagent/Args.c
@@ -201,7 +201,7 @@ int ddxProcessArgument(int argc, char *argv[], int i)
     /*
      * Check if we are running as X2Go Agent
      */
-    checkX2goAgent();
+    checkX2goAgent(argc, argv);
 #endif
   }
 
diff --git a/nx-X11/programs/Xserver/hw/nxagent/Init.c b/nx-X11/programs/Xserver/hw/nxagent/Init.c
index 8a9964154..fe51b595a 100644
--- a/nx-X11/programs/Xserver/hw/nxagent/Init.c
+++ b/nx-X11/programs/Xserver/hw/nxagent/Init.c
@@ -183,20 +183,52 @@ Bool nxagentX2go;
 /*
  * Check if agent is X2goAgent
  */
-void checkX2goAgent(void)
+void checkX2goAgent(int argc, char * argv[])
 {
   #ifdef TEST
   fprintf(stderr, "%s: nxagentProgName [%s]\n", __func__, nxagentProgName);
   #endif
 
+  nxagentX2go = False;
+
   if (strcasecmp(nxagentProgName,"x2goagent") == 0)
   {
-    fprintf(stderr, "\nrunning as X2Go Agent\n");
     nxagentX2go = True;
   }
   else
-    nxagentX2go = False;
+  {
+    char *envDisplay = getenv("DISPLAY");
+
+    /* x2go DISPLAY variable contains ".x2go" */
+    if (envDisplay && strstr(envDisplay, ".x2go-"))
+    {
+      nxagentX2go = True;
+    }
+    else
+    {
+      for (int i = 1; i < argc; i++)
+      {
+        /* x2go session names are passed with -name and start with "X2GO-" */
+        if (argv[i] && strncmp(argv[i], "-name", 5)  == 0)
+        {
+          if (i < argc - 1)
+          {
+            if (strstr(argv[i+1], "X2GO-"))
+            {
+              nxagentX2go = True;
+              break;
+            }
+          }
+        }
+      }
+    }
+  }
+
+  if (nxagentX2go)
+    fprintf(stderr, "\nrunning as X2Go Agent\n");
 }
+
+
 #endif
 
 /*
diff --git a/nx-X11/programs/Xserver/hw/nxagent/Init.h b/nx-X11/programs/Xserver/hw/nxagent/Init.h
index ec0bb3483..d08517771 100644
--- a/nx-X11/programs/Xserver/hw/nxagent/Init.h
+++ b/nx-X11/programs/Xserver/hw/nxagent/Init.h
@@ -47,7 +47,7 @@ extern Bool nxagentSaveUnder;
 
 #ifdef X2GO
 extern Bool nxagentX2go;
-void checkX2goAgent(void);
+void checkX2goAgent(int argc, char *argv[]);
 #endif
 
 extern ServerGrabInfoRec nxagentGrabServerInfo;
-- 
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