--- loncom/lonnet/perl/lonnet.pm	2004/11/04 23:43:07	1.561
+++ loncom/lonnet/perl/lonnet.pm	2004/11/06 01:11:38	1.562
@@ -1,7 +1,7 @@
 # The LearningOnline Network
 # TCP networking package
 #
-# $Id: lonnet.pm,v 1.561 2004/11/04 23:43:07 banghart Exp $
+# $Id: lonnet.pm,v 1.562 2004/11/06 01:11:38 albertel Exp $
 #
 # Copyright Michigan State University Board of Trustees
 #
@@ -4867,10 +4867,16 @@ sub get_rand_alg {
     return &latest_rnd_algorithm_id();
 }
 
+sub validCODE {
+    my ($CODE)=@_;
+    if (defined($CODE) && $CODE ne '' && $CODE =~ /^\w+$/) { return 1; }
+    return 0;
+}
+
 sub getCODE {
-    if (defined($ENV{'form.CODE'})) { return $ENV{'form.CODE'}; }
+    if (&validCODE($ENV{'form.CODE'})) { return $ENV{'form.CODE'}; }
     if (defined($Apache::lonhomework::parsing_a_problem) &&
-	defined($Apache::lonhomework::history{'resource.CODE'})) {
+	&validCODE($Apache::lonhomework::history{'resource.CODE'})) {
 	return $Apache::lonhomework::history{'resource.CODE'};
     }
     return undef;