Errorimage does not render on systems without GD ttf support

[duhow]

Not sure when happened, but I think it's because RRD file not existing and try to Turn On Data Source Debug Mode.

PHP Warning:  imagestring() expects parameter 6 to be integer, string given in /var/www/cacti-1.1.35/lib/rrd.php on line 3401, referer: http://cacti-test/graphs.php?action=graph_edit&id=4

[netniV]

This is actually not because of that but because you don't have TrueType enabled on your system and there is a bug with the imagestring call. It should be using $text_color not $font_color.

At line 3362, it allocates the color correctly. However, at line 3401 when it tries to use image_string() it's using font_color which is actually a hex encoded RGB string so would never work.

[netniV]

Try this patch:

diff --git a/lib/rrd.php b/lib/rrd.php
index b7688ac..59662f0 100644
--- a/lib/rrd.php
+++ b/lib/rrd.php
@@ -3398,7 +3398,7 @@ function rrdtool_create_error_image($string, $width = '', $height = '') {
        } else {
                foreach($strings as $string) {
                        if (trim($string) != '') {
-                               if (!imagestring($image, $font_size, $xpos, $ypos, $string, $font_color)) {
+                               if (!imagestring($image, $font_size, $xpos, $ypos, $string, $text_color)) {
                                        cacti_log('Text overlay failed');
                                }
                                $ypos -= ($font_size + $padding);

[cigamit]

This issue is resolved now. Thanks for taking the time to report.