ActiveSocket Toolkit Add network capabilities to any Windows or .NET application

Quicklinks

DNS NsLookup using PHP

The Domain Name System (DNS) is the method by which Internet addresses in mnemonic form - such as www.activexperts.com - are converted into the equivalent numeric IP address such as 212.97.55.136. To the user and application process this translation is a service provided either by the local host or from a remote host via the Internet. The DNS server (or resolver) may communicate with other Internet DNS servers if it cannot translate the address itself.

DNS names are constructed hierarchically. The highest level of the hierarchy is the last component or label of the DNS address. Labels can be up to 63 characters long and are not case sensitive. A maximum length of 255 characters is allowed. Labels must start with a letter and can only consist of letters, digits and hyphens.

Nslookup is a popular program for UNIX, LINUX and Windows to query Internet domain name servers. It allows the user to query name servers for information about various hosts and domains or to print a list of hosts in a domain.

ActiveSocket provides an easy-to-use development/scripting interface to use the same operations as NsLookup, through the DnsServer class. By using ActiveSocket, you can very easily create or enhance Windows applications/scripts with DNS lookup features.

ActiveSocket features the following: DNS, FTP, HTTP, HTTPs, ICMP Ping, IP-to-Country, MSN, NTP, RSH, SCP, SFTP, SNMP v1/v2c (Get, GetNext, Set), SNMP Traps, SNMP MIB, SSH, TCP, Telnet, TFTP, UDP, Telnet, Wake-On-LAN and more.

Step 1: Download and install the ActiveSocket Toolkit

Download the ActiveSocket Toolkit from the ActiveXperts Download Site and start the installation. The installation guides you through the installation process.

Step 2: Create a html form

To connect to an ftp server using php we need to collect the login information from the user, then connect to the server and then view the content

First of all we need to collect some information from the user. Like the username, the password and ofcourse the server we are going to connect to. Perhaps you'd like to change the directory or/and create a logfile at logon. You can make the form look like this.

(Click on the picture to enlarge)

Step 3: Create the ActiveSocket object

If you wat to use ActiveSocket Ftp in php, you need to create an object. In php this means you need to create a new COM. The following code shows how to do this. 

<?

//create the ActiveSocket FTP object
$activeFtp = new com("ActiveXperts.FtpServer");

?>

Step 4: Proces the information

Now we need to connect to the server and display the content of the server. In this sample we're working with a form. If the form is submitted, we're passing The following code shows how to do this: 

<?

//create the ActiveSocket FTP object
$activeFtp = new com("ActiveXperts.FtpServer");

if(isset($_GET['method'])){

  //set the logfile:
  $activeFtp->logfile = $_POST["logfile"];

  //connect the server
  $activeFtp->connect($_POST["server"], $_POST["username"], $_POST["password"]);

	//change directory
	$activeFtp->ChangeDir($_POST["dir"]);
	
  //display the table in witch we are going to present our information
  echo "<table>";
  echo "  <tr>";
  echo "    <td colspan=1 class=header>";
  echo "Size:";
  echo "    </td>";
  echo "    <td class=header>";
  echo "Filename:";
  echo "    </td>";
  echo "  </tr>";

  //get the firstfile (if the first file is fetched, move on to the next untill there is no next file, then an error will occure)	
  $files = $activeFtp->FindFirstFile();

  //get the errors and descriptions
	$error = $activeFtp->Lasterror;
	$description = $activeFtp->GetErrorDescription($activeFtp->Lasterror);
	
  //if the filename was successfully fetched, echo the filename and the filesize
  while($activeFtp->Lasterror == 0){
    echo "  <tr>";
    echo "    <td class=size>";
    //check if the file is a directory		
    if($files->isDirectory == -1){
      //if the file is a directory: echo "Directory"		
      echo "Directory";
    }
    else{
      //if the file isn't a directory, echo the filesize		
      echo $files->size . " Bytes";
    }
    echo "    </td>";
    echo "    <td class=filename>";
    echo $files->name . "<br>";
    echo "    </td>";	
    echo "  </tr>";
		
		//find the next file, and display it again..
    $files = $activeFtp->FindNextFile;		
  }
	
	//close the table tag
	echo "</table>";
	echo "<br>";

//close the if statement
}


//create a table and display the errors that have occured
echo "<table>";
echo "  <tr>";
echo "    <td colspan=1 class=header>";
echo "ErrorNo.:";
echo "    </td>";
echo "    <td class=header>";
echo "Error description:";
echo "    </td>";
echo "  </tr>";
echo "  <tr>";
echo "    <td class=size>";
echo $error;
echo "    </td>";
echo "    <td class=filename>";
echo $description;
echo "    </td>";
echo "  </tr>";
echo "</table>";

?>

There are many working samples included with the product. You can also find them on the ActiveXperts FTP site: ftp.activexperts-labs.com/samples/network-component.