[SOLVED] Mail form

[AV1611]

I have have several websites that use a simple mail form to send email to site admin.  I noticed on of them is getting hit by a "bot" and spamming viagra ads to the site admin.

 

How can I prevent this?  Do I do one of those pictures with letters, which seems annoying to the visitor or is there a way in the code?

 

if needed here is my php that processes the form...

 

<<<snip>>>
$to = "xxxx@xxxx.com"; //
$name = $_POST['name'];
$email = $_POST['email'];
$subject = $_POST['subject'];
$msg = $_POST['msg'];
$sub = "Online Email Form";
$messub = "Subject: ".$subject."\r\n" ;
$mesmsg .= "Message: ".$msg."\r\n" ;
$mesname .= "Name: ".$name."\r\n" ;
$mesemail .= "Email: ".$email."\r\n" ;
$body=$messub.$mesname.$mesemail.$mesmsg;
$headers = 'From: '. $name . "\r\n" .
   'Reply-To: '. $email . "\r\n" .
   'X-Mailer: PHP/' . phpversion();
if(empty($name) || empty($email) || empty($subject) || empty($msg)) {
echo " <h3>You must fill in all the information.</h3>";
}
elseif(!ereg("^[_a-zA-Z0-9-]+(.[_a-zA-Z0-9-]+)*@[a-zA-Z0-9-]+(.[a-zA-Z0-9-]+)*(.[a-zA-Z]{2,3})$",$email)){
print " <h3>You entered an invalid email address</h3>";
} else {
mail($to, $sub, $body, $headers);
print " <h3><center>Thanks, ".$name.", for contacting us...</center></h3>";
}
<<<snip>>>

[chigley]

Your best bet is a CAPTCHA/Turner code. I made one myself a while back if you want to use it:

 

index.php

 

<?php

// Begin the session to receive the code used from the image.php file
session_start();

?>

<form action="action.php" method="post">
<img src="image.php" alt="Security Image" /><input type="text" id="code" name="code" />
<input type="submit" value="Submit" />
</form>

 

action.php

 

<?php

// Start the session to check the codes

session_start();

// Check the code

if(($_SESSION['code'] == $_POST['code']) && (!empty($_SESSION['code'])) ) {
	echo "Code correct";
	unset($_SESSION['code']);
} else {
	echo "Code incorrect";
}

?>

 

image.php

 

<?php

/*-----------------------------------------------------------*\
| **************** User Editable Variables ****************** |
+-------------------------------------------------------------+
| $length -> the length of the string displayed on the image  |
| $chars -> the character range used in the string            |
| $fontsize -> the size of the font to be used in pixels      |
| $fontfile -> the TTF font file you want to be used          |
| $imagewidth -> the image width in pixels                    |
| $imageheight -> the image height in pixels                  |
| $textcolour -> comma separated RGB values of the text colour|
| $noisetotal -> the number of noise pixels required          |
| $noisecolour -> RGB values of the noise colour              |
\*-----------------------------------------------------------*/ 

$length = 6;
$chars = "ABCDEFGHJKLMNOPQRSTUVWXYZabcdefhkmnorstuvwx123456789";
$fontsize = 14;
$fontfile = "mono.ttf";
$imagewidth = 45;
$imageheight = 22;
$textcolour = "0,0,0";
$noisetotal = 100;
$noisecolour = "0,0,255";

/*------------------------------------------------------------*\
| ********************** Captcha Code ************************ |
\*------------------------------------------------------------*/ 

// Start the session, to send the code used to other pages
	session_start();

// Reset the variables
	$code = "";

// Split the availiable character range into separate characters
	$chars = preg_split('//', $chars, -1, PREG_SPLIT_NO_EMPTY);

// Choose $length number of random characters from the array
	$keys = array_rand($chars, $length);

// Add each of the chosen characters to the $code array
	$codearr = array();
	foreach($keys as $key => $value) {
		$value = $chars[$value];
		array_push($codearr, $value);
		$code .= $value;
	}

// Create the image

	// Begin to make the image using GD
		header ("Content-type: image/png");
		$img = imagecreatetruecolor($imagewidth, $imageheight);

	// Define the colours
		$white = imagecolorallocate($img, 255, 255, 255);
		$colour = explode(",", $textcolour);
		$colour = imagecolorallocate($img, $colour[0], $colour[1], $colour[2]);
		$noise = explode(",", $noisecolour);
		$noise = imagecolorallocate($img, $noise[0], $noise[1], $noise[2]);

	// Add the data
		imagefill($img, 0, 0, $white);

	// Add the noise
		while($noisecount < $noisetotal) {
			$randomx = rand(0, imagesx($img));
			$randomy = rand(0, imagesy($img));
			imagesetpixel($img, $randomx, $randomy, $noise);
			$noisecount++;
		}

		// Calculate the angle to be used
			$angle = rand(-5, 5);
			if($angle < 0) {
				$y = $imageheight - 10;
			} else {
				$y = $imageheight;
			}

		imagettftext($img, $fontsize, $angle, 0, $y, $colour, $fontfile, $code);

	// Output the image
		imagepng($img);
		imagedestroy($img);

	// Send the session variable to the next page accessed to check if the code was correct

		$_SESSION['code'] = $code;

?>

 

I hope you find that useful,

 

Chigley

[AV1611]

So the graphic thingy is my only real choice then?  :-\

(Thanks for the code...)

 

 

[chigley]

Yeah unless you want to have a list of emails that are not allowed, I'd go with the image though if it was me.

[AV1611]

the script image.php above gives me this:

 

dunno what to do...

 

The image “http://xxx.com/image.php” cannot be displayed, because it contains errors.

 

I have made no changes to it...