print warning messages when using target remote with gef

gef.py

@@ -355,6 +355,15 @@ def is_alive() -> bool:
         return False
 
 
+def calling_function() -> Optional[str]:
+    """Return the name of the calling function"""
+    try:
+        stack_info = traceback.extract_stack()[-3]
+        return stack_info.name
+    except:
+        return None
+
+
 #
 # Decorators
 #
@@ -10689,7 +10698,7 @@ def __setup_remote(self) -> bool:
 
     def remote_objfile_event_handler(self, evt: "gdb.NewObjFileEvent") -> None:
         dbg(f"[remote] in remote_objfile_handler({evt.new_objfile.filename if evt else 'None'}))")
-        if not evt:
+        if not evt or not evt.new_objfile.filename:
             return
         if not evt.new_objfile.filename.startswith("target:") and not evt.new_objfile.filename.startswith("/"):
             warn(f"[remote] skipping '{evt.new_objfile.filename}'")
@@ -10856,3 +10865,8 @@ def reset_caches(self) -> None:
         new_objfile_handler(None)
 
     GefTmuxSetup()
+
+    # `target remote` commands cannot be disabled, so print a warning message instead
+    errmsg = "Using `target remote` with GEF does not work, use `gef-remote` instead. You've been warned."
+    gdb.execute(f"define target hook-remote\n pi if calling_function() != \"connect\": err(\"{errmsg}\") \nend")
+    gdb.execute(f"define target hook-extended-remote\n pi if calling_function() != \"connect\": err(\"{errmsg}\") \nend")