chore: import upstream snapshot with attribution

webmin/change_referers.cgi

@@ -0,0 +1,23 @@
+#!/usr/local/bin/perl
+# change_referers.cgi
+# Change referer checking settings
+
+require './webmin-lib.pl';
+&ReadParse();
+&error_setup($text{'referers_err'});
+
+&lock_file("$config_directory/config");
+$gconfig{'referer'} = $in{'referer'};
+@refs = split(/\s+/, $in{'referers'});
+foreach my $r (@refs) {
+	$r =~ /^[a-z0-9\.\-\_]+$/ ||
+		&error(&text('referers_ehost', &html_escape($r)));
+	}
+$gconfig{'referers'} = join(" ", @refs);
+$gconfig{'referers_none'} = int(!$in{'referers_none'});
+&write_file("$config_directory/config", \%gconfig);
+&unlock_file("$config_directory/config");
+&webmin_log('referers', undef, undef, \%in);
+
+&redirect("");
+