This could be captcha.php
Go to file manager in your forums root find captcha.php
Replace all the content in it with:
<?php
/**
* MyBB 1.4
* Copyright © 2008 MyBB Group, All Rights Reserved
*
* Website: http://www.mybboard.net
* License: http://www.mybboard.net/about/license
*
* $Id: captcha.php 4304 2009-01-02 01:11:56Z chris $
*/
define("IN_MYBB", 1);
define("NO_ONLINE", 1);
define('THIS_SCRIPT', 'captcha.php');
require_once "./global.php";
$img_width = 200;
$img_height = 60;
// The following settings are only used for TTF fonts
$min_size = 20;
$max_size = 32;
$min_angle = -30;
$max_angle = 30;
if($mybb->input['imagehash'] == "test")
{
$imagestring = "MyBB";
}
elseif($mybb->input['imagehash'])
{
$query = $db->simple_select("captcha", "*", "imagehash='".$db->escape_string(strval($mybb->input['imagehash']))."'", array("limit" => 1));
$regimage = $db->fetch_array($query);
$imagestring = $regimage['imagestring'];
}
else
{
return false;
}
$ttf_fonts = array();
// We have support for true-type fonts (FreeType 2)
if(function_exists("imagefttext"))
{
// Get a list of the files in the 'catpcha_fonts' directory
$ttfdir = @opendir(MYBB_ROOT."inc/captcha_fonts");
if($ttfdir)
{
while($file = readdir($ttfdir))
{
// If this file is a ttf file, add it to the list
if(is_file(MYBB_ROOT."inc/captcha_fonts/".$file) && get_extension($file) == "ttf")
{
$ttf_fonts[] = MYBB_ROOT."inc/captcha_fonts/".$file;
}
}
}
}
// Have one or more TTF fonts in our array, we can use TTF captha's
if(count($ttf_fonts) > 0)
{
$use_ttf = 1;
}
else
{
$use_ttf = 0;
}
// Check for GD >= 2, create base image
if(gd_version() >= 2)
{
$im = imagecreatetruecolor($img_width, $img_height);
}
else
{
$im = imagecreate($img_width, $img_height);
}
// No GD support, die.
if(!$im)
{
die("No GD support.");
}
// Fill the background with white
$bg_color = imagecolorallocate($im, 255, 255, 255);
imagefill($im, 0, 0, $bg_color);
// Draw random circles, squares or lines?
$to_draw = mt_rand(0, 2);
if($to_draw == 1)
{
draw_circles($im);
}
else if($to_draw == 2)
{
draw_squares($im);
}
else
{
draw_lines($im);
}
// Draw dots on the image
draw_dots($im);
// Write the image string to the image
draw_string($im, $imagestring);
// Draw a nice border around the image
$border_color = imagecolorallocate($im, 0, 0, 0);
imagerectangle($im, 0, 0, $img_width-1, $img_height-1, $border_color);
// Output the image
header("Content-type: image/png");
imagepng($im);
imagedestroy($im);
exit;
/**
* Draws a random number of lines on the image.
*
* @param resource The image.
*/
function draw_lines(&$im)
{
global $img_width, $img_height;
for($i = 10; $i < $img_width; $i += 10)
{
$color = imagecolorallocate($im, mt_rand(150, 255), mt_rand(150, 255), mt_rand(150, 255));
imageline($im, $i, 0, $i, $img_height, $color);
}
for($i = 10; $i < $img_height; $i += 10)
{
$color = imagecolorallocate($im, mt_rand(150, 255), mt_rand(150, 255), mt_rand(150, 255));
imageline($im, 0, $i, $img_width, $i, $color);
}
}
/**
* Draws a random number of circles on the image.
*
* @param resource The image.
*/
function draw_circles(&$im)
{
global $img_width, $img_height;
$circles = $img_width*$img_height / 100;
for($i = 0; $i <= $circles; ++$i)
{
$color = imagecolorallocate($im, mt_rand(180, 255), mt_rand(180, 255), mt_rand(180, 255));
$pos_x = mt_rand(1, $img_width);
$pos_y = mt_rand(1, $img_height);
$circ_width = ceil(mt_rand(1, $img_width)/2);
$circ_height = mt_rand(1, $img_height);
imagearc($im, $pos_x, $pos_y, $circ_width, $circ_height, 0, mt_rand(200, 360), $color);
}
}
/**
* Draws a random number of dots on the image.
*
* @param resource The image.
*/
function draw_dots(&$im)
{
global $img_width, $img_height;
$dot_count = $img_width*$img_height/5;
for($i = 0; $i <= $dot_count; ++$i)
{
$color = imagecolorallocate($im, mt_rand(200, 255), mt_rand(200, 255), mt_rand(200, 255));
imagesetpixel($im, mt_rand(0, $img_width), mt_rand(0, $img_height), $color);
}
}
/**
* Draws a random number of squares on the image.
*
* @param resource The image.
*/
function draw_squares(&$im)
{
global $img_width, $img_height;
$square_count = 30;
for($i = 0; $i <= $square_count; ++$i)
{
$color = imagecolorallocate($im, mt_rand(150, 255), mt_rand(150, 255), mt_rand(150, 255));
$pos_x = mt_rand(1, $img_width);
$pos_y = mt_rand(1, $img_height);
$sq_width = $sq_height = mt_rand(10, 20);
$pos_x2 = $pos_x + $sq_height;
$pos_y2 = $pos_y + $sq_width;
imagefilledrectangle($im, $pos_x, $pos_y, $pos_x2, $pos_y2, $color);
}
}
/**
* Writes text to the image.
*
* @param resource The image.
* @param string The string to be written
*/
function draw_string(&$im, $string)
{
global $use_ttf, $min_size, $max_size, $min_angle, $max_angle, $ttf_fonts, $img_height, $img_width;
if(empty($string))
{
return false;
}
$spacing = $img_width / my_strlen($string);
$string_length = my_strlen($string);
for($i = 0; $i < $string_length; ++$i)
{
// Using TTF fonts
if($use_ttf)
{
// Select a random font size
$font_size = mt_rand($min_size, $max_size);
// Select a random font
$font = array_rand($ttf_fonts);
$font = $ttf_fonts[$font];
// Select a random rotation
$rotation = mt_rand($min_angle, $max_angle);
// Set the colour
$r = mt_rand(0, 200);
$g = mt_rand(0, 200);
$b = mt_rand(0, 200);
$color = imagecolorallocate($im, $r, $g, $b);
// Fetch the dimensions of the character being added
$dimensions = imageftbbox($font_size, $rotation, $font, $string[$i], array());
$string_width = $dimensions[2] - $dimensions[0];
$string_height = $dimensions[3] - $dimensions[5];
// Calculate character offsets
//$pos_x = $pos_x + $string_width + ($string_width/4);
$pos_x = $spacing / 4 + $i * $spacing;
$pos_y = ceil(($img_height-$string_height/2));
if($pos_x + $string_width > $img_width)
{
$pos_x = $pos_x - ($pos_x - $string_width);
}
// Draw a shadow
$shadow_x = mt_rand(-3, 3) + $pos_x;
$shadow_y = mt_rand(-3, 3) + $pos_y;
$shadow_color = imagecolorallocate($im, $r+20, $g+20, $b+20);
imagefttext($im, $font_size, $rotation, $shadow_x, $shadow_y, $shadow_color, $font, $string[$i], array());
// Write the character to the image
imagefttext($im, $font_size, $rotation, $pos_x, $pos_y, $color, $font, $string[$i], array());
}
else
{
// Get width/height of the character
$string_width = imagefontwidth(5);
$string_height = imagefontheight(5);
// Calculate character offsets
$pos_x = $spacing / 4 + $i * $spacing;
$pos_y = $img_height / 2 - $string_height -10 + mt_rand(-3, 3);
// Create a temporary image for this character
if(gd_version() >= 2)
{
$temp_im = imagecreatetruecolor(15, 20);
}
else
{
$temp_im = imagecreate(15, 20);
}
$bg_color = imagecolorallocate($temp_im, 255, 255, 255);
imagefill($temp_im, 0, 0, $bg_color);
imagecolortransparent($temp_im, $bg_color);
// Set the colour
$r = mt_rand(0, 200);
$g = mt_rand(0, 200);
$b = mt_rand(0, 200);
$color = imagecolorallocate($temp_im, $r, $g, $b);
// Draw a shadow
$shadow_x = mt_rand(-1, 1);
$shadow_y = mt_rand(-1, 1);
$shadow_color = imagecolorallocate($temp_im, $r+50, $g+50, $b+50);
imagestring($temp_im, 5, 1+$shadow_x, 1+$shadow_y, $string[$i], $shadow_color);
imagestring($temp_im, 5, 1, 1, $string[$i], $color);
// Copy to main image
imagecopyresized($im, $temp_im, $pos_x, $pos_y, 0, 0, 40, 55, 15, 20);
imagedestroy($temp_im);
}
}
}
/**
* Obtain the version of GD installed.
*
* @return float Version of GD
*/
function gd_version()
{
static $gd_version;
if($gd_version)
{
return $gd_version;
}
if(!extension_loaded('gd'))
{
return;
}
if(function_exists("gd_info"))
{
$gd_info = gd_info();
preg_match('/\d/', $gd_info['GD Version'], $gd);
$gd_version = $gd[0];
}
else
{
ob_start();
phpinfo(8);
$info = ob_get_contents();
ob_end_clean();
$info = stristr($info, 'gd version');
preg_match('/\d/', $info, $gd);
$gd_version = $gd[0];
}
return $gd_version;
}
?>
