PHP function to check domain availability not working

Question

I am unable to get this script to function correctly. When i try to pass a domain to it, it always returns AVAILABLE, even for cnn.com! $message is the name of the domain that i am checking the availability of.

This is the function call;

include("domain.class.php");

// Initializing class
$domain=new domain("$message");

// Checking if domain is available
if($domain->is_available()){
$status = "$message is available";
}else{
$status = "$message is unavailable";
echo = $status;
}

And this is domain.class.php;

<?
class domain{
var $domain="";
var $servers=array(
array("com","whois.geektools.com","No match"),
 array("net","whois.geektools.com","No match"),
  array("org","whois.geektools.com","No match"),
);



var $idn=array(224,225,226,227,228,229,230,231,232,233,234,235,240,236,237,238,239,241,242,243,244,245,246,248,254,249,250,251,252,253,255);
// var $idn=array("00E0","00E1","00E2","00E3","00E4","00E5","0101","0103","0105","00E6","00E7","0107","0109","010B","010D","010F","0111","00E8","00E9","00EA","00EB","0113","0115","0117","0119","011B","014B","00F0","011D","011F","0121","0123","0125","0127","00EC","00ED","00EE","00EF","0129","012B","012D","012F","0131","0135","0137","0138","013A","013C","013E","0142","00F1","0144","0146","0148","00F2","00F3","00F4","00F5","00F6","00F8","014D","014F","0151","0153","0155","0157","0159","015B","015D","015F","0161","0163","0165","0167","00FE","00F9","00FA","00FB","00FC","0169","016B","016D","016F","0171","0173","0175","00FD","00FF","0177","017A","017C","017E");

function domain($str_domainname){
 $this->domain=$str_domainname;
}

function info(){
 if($this->is_valid()){

  $tldname=$this->get_tld();
  $domainname=$this->get_domain();
  $whois_server=$this->get_whois_server();

  if($whois_server!=""){
   $fp = fsockopen($whois_server,43);

   $dom=$domainname.".".$tldname;
//     fputs($fp, "$dom\r\n");

   // New IDN
   if($tldname=="de") {
    fputs($fp, "-C ISO-8859-1 -T dn $dom\r\n");
   } else {
    fputs($fp, "$dom\r\n");
   }

   // Getting string
   $string="";

   // Checking whois server for .com and .net
   if($tldname=="com" || $tldname=="net" || $tldname=="edu"){
    while(!feof($fp)){
     $line=trim(fgets($fp,128));

     $string.=$line;

     $lineArr=split(":",$line);

     if(strtolower($lineArr[0])=="whois server"){
      $whois_server=trim($lineArr[1]);
     }
    }
    // Getting whois information
    $fp = fsockopen($whois_server,43);

    $dom=$domainname.".".$tldname;
    fputs($fp, "$dom\r\n");

    // Getting string
    $string="";

    while(!feof($fp)){
     $string.=fgets($fp,128);
    }

    // Checking for other tld's
   }else{
    while(!feof($fp)){
     $string.=fgets($fp,128);
    }
   }
   fclose($fp);

   return $string;
  }else{
   return "No whois server for this tld in list!";
  }
 }else{
  return "Domainname isn't valid!";
 }
}

/**
* Returns the whois data of the domain in HTML format
* @return string $whoisdata Whois data as string in HTML
* @desc Returns the whois data of the domain  in HTML format
*/
function html_info(){
 return nl2br($this->info());
}

/**
* Returns name of the whois server of the tld
* @return string $server the whois servers hostname
* @desc Returns name of the whois server of the tld
*/
function get_whois_server(){
 $found=false;
 $tldname=$this->get_tld();
 for($i=0;$i<count($this->servers);$i++){
  if($this->servers[$i][0]==$tldname){
   $server=$this->servers[$i][1];
   $full_dom=$this->servers[$i][3];
   $found=true;
  }
 }
 return $server;
}

/**
* Returns the tld of the domain without domain name
* @return string $tldname the tlds name without domain name
* @desc Returns the tld of the domain without domain name
*/
function get_tld(){
 // Splitting domainname
 $domain=split("\.",$this->domain);
 if(count($domain)>2){
  $domainname=$domain[0];
  for($i=1;$i<count($domain);$i++){
   if($i==1){
    $tldname=$domain[$i];
   }else{
    $tldname.=".".$domain[$i];
   }
  }
 }else{
  $domainname=$domain[0];
  $tldname=$domain[1];
 }
 return $tldname;
}


/**
* Returns all tlds which are supported by the class
* @return array $tlds all tlds as array
* @desc Returns all tlds which are supported by the class
*/
function get_tlds(){
 $tlds="";
 for($i=0;$i<count($this->servers);$i++){
  $tlds[$i]=$this->servers[$i][0];
 }
 return $tlds;
}

/**
* Returns the name of the domain without tld
* @return string $domain the domains name without tld name
* @desc Returns the name of the domain without tld
*/
function get_domain(){
 // Splitting domainname
 $domain=split("\.",$this->domain);
 return $domain[0];
}

/**
* Returns the full domain
* @return string $fulldomain
* @desc Returns the full domain
*/
function get_fulldomain(){
 return $this->domain;
}

/**
* Returns the string which will be returned by the whois server of the tld if a domain is avalable
* @return string $notfound  the string which will be returned by the whois server of the tld if a domain is avalable
* @desc Returns the string which will be returned by the whois server of the tld if a domain is avalable
*/
function get_notfound_string(){
 $found=false;
 $tldname=$this->get_tld();
 for($i=0;$i<count($this->servers);$i++){
  if($this->servers[$i][0]==$tldname){
   $notfound=$this->servers[$i][2];
  }
 }
 return $notfound;
}

/**
* Returns if the domain is available for registering
* @return boolean $is_available Returns 1 if domain is available and 0 if domain isn't available
* @desc Returns if the domain is available for registering
*/
function is_available(){
 $whois_string=$this->info(); // Gets the entire WHOIS query from registrar
 $not_found_string=$this->get_notfound_string(); // Gets 3rd item from array
 $domain=$this->domain; // Gets current domain being queried

 $whois_string2=@ereg_replace("$domain","",$whois_string);

 $whois_string =@preg_replace("/\s+/"," ",$whois_string); //Replace whitespace with single space

 $array=split(":",$not_found_string);

 if($array[0]=="MAXCHARS"){
  if(strlen($whois_string2)<=$array[1]){
   return true;
  }else{
   return false;
  }
 }else{
  if(preg_match("/".$not_found_string."/i",$whois_string)){
   return true;
  }else{
   return false;
  }
 }
}

function get_cn_server($whois_text){

}


/**
* Returns if the domain name is valid
* @return boolean $is_valid Returns 1 if domain is valid and 0 if domain isn't valid
* @desc Returns if the domain name is valid
*/
function is_valid(){

 $domainArr=split("\.",$this->domain);

 // If it's a tld with two Strings (like co.uk)
 if(count($domainArr)==3){

  $tld=$domainArr[1].".".$domainArr[2];
  $found=false;

  for($i=0;$i<count($this->servers) && $found==false;$i++){
   if($this->servers[$i][0]==$tld){
    $found=true;
   }
  }
  if(!$found){
   return false;
  }

 }else if(count($domainArr)>3){
  return false;
 }

 // Creating regular expression for
 if($this->get_tld()=="de"){
  for($i=0;$i<count($this->idn);$i++){
   $idn.=chr($this->idn[$i]);
   // $idn.="\x".$this->idn[$i]."";
  }
  $pattern="^[a-z".$idn."0-9\-]{3,}$";
 }else{
  $pattern="^[a-z0-9\-]{3,}$";
 }

 if(ereg($pattern,strtolower($this->get_domain())) && !ereg("^-|-$",strtolower($this->get_domain())) && !preg_match("/--/",strtolower($this->get_domain()))){
  return true;
 }else{
  return false;
 }
}
}
?>

Ive been studying over this and trying different things for a while. Could someone point me in the right direction? Id love to learn what im missing here.

Answer 1

I've isolated the problem to at least two methods in domain.class.php, which are broken. Here is a quick fix.

Take away the domain validation:

function is_valid(){ //because this always returns false
    return true;

also, get_whois_server() always returns nothing. So we return a literal string from get_whois_server(), i.e:

function get_whois_server(){
    return "whois.geektools.com"; //the whois server declared in the class does work

Lastly, whois.geektools.com changed their No Match string to "no information" and that's how we know when a domain is available. Change the array at the beginning of the class to:

array("com","whois.geektools.com","no information"), //No match to "no information"
        array("net","whois.geektools.com","No match"),
                array("org","whois.geektools.com","No match"),
);

Then as expected:

 $domain = new domain("google.com"); //make sure to leave out http:// and www
 if(....
    ....
 //Returns "is unavailable";

And

 $domain = new domain("jsdhfsdfkljsadhjds.com"); //make sure to leave out http:// and www
 if(....
    ....
 //Returns "is available";