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IPv4.php
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IPv4.php
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<?php
//
// +----------------------------------------------------------------------+
// | PHP Version 4 |
// +----------------------------------------------------------------------+
// | Copyright (c) 1997-2002 The PHP Group |
// +----------------------------------------------------------------------+
// | This source file is subject to version 2.0 of the PHP license, |
// | that is bundled with this package in the file LICENSE, and is |
// | available at through the world-wide-web at |
// | http://www.php.net/license/2_02.txt. |
// | If you did not receive a copy of the PHP license and are unable to |
// | obtain it through the world-wide-web, please send a note to |
// | license@php.net so we can mail you a copy immediately. |
// +----------------------------------------------------------------------+
// | Authors: Eric Kilfoil <eric@ypass.net> |
// +----------------------------------------------------------------------+
//
require_once("PEAR.php");
/**
* Map of bitmasks to subnets
*
* This array contains every valid netmask. The index of the dot quad
* netmask value is the corresponding CIDR notation (bitmask).
*/
$Net_IPv4_Netmask_Map = array(
0 => "0.0.0.0",
1 => "128.0.0.0",
2 => "192.0.0.0",
3 => "224.0.0.0",
4 => "240.0.0.0",
5 => "248.0.0.0",
6 => "252.0.0.0",
7 => "254.0.0.0",
8 => "255.0.0.0",
9 => "255.128.0.0",
10 => "255.192.0.0",
11 => "255.224.0.0",
12 => "255.240.0.0",
13 => "255.248.0.0",
14 => "255.252.0.0",
15 => "255.254.0.0",
16 => "255.255.0.0",
17 => "255.255.128.0",
18 => "255.255.192.0",
19 => "255.255.224.0",
20 => "255.255.240.0",
21 => "255.255.248.0",
22 => "255.255.252.0",
23 => "255.255.254.0",
24 => "255.255.255.0",
25 => "255.255.255.128",
26 => "255.255.255.192",
27 => "255.255.255.224",
28 => "255.255.255.240",
29 => "255.255.255.248",
30 => "255.255.255.252",
31 => "255.255.255.254",
32 => "255.255.255.255"
);
/**
* Class to provide IPv4 calculations
*
* Provides methods for validating IP addresses, calculating netmasks,
* broadcast addresses, network addresses, conversion routines, etc.
*
* @author Eric Kilfoil <edk@ypass.net>
* @package Net_IPv4
* @version 1.0
* @access public
*/
class Net_IPv4 extends PEAR
{
var $ip = "";
var $bitmask = false;
var $netmask = "";
var $network = "";
var $broadcast = "";
var $long = 0;
/**
* Validate the syntax of the given IP adress
*
* Using the PHP long2ip() and ip2long() functions, convert the IP
* address from a string to a long and back. If the original still
* matches the converted IP address, it's a valid address. This
* function does not allow for IP addresses to be formatted as long
* integers.
*
* @param string $ip IP address in the format x.x.x.x
* @return bool true if syntax is valid, otherwise false
*/
function validateIP($ip)
{
if ($ip == long2ip(ip2long($ip))) {
return(TRUE);
} else {
return(FALSE);
}
}
/**
* Validate the syntax of the given IP address (compatibility)
*
* This function is identical to Net_IPv4::validateIP(). It is included
* merely for compatibility reasons.
*
* @param string $ip IP address
* @return bool true if syntax is valid, otherwise false
*/
function check_ip($ip)
{
return($this->validateIP($ip));
}
/**
* Validate the syntax of a four octet netmask
*
* There are 33 valid netmask values. This function will compare the
* string passed as $netmask to the predefined 33 values and return
* true or false. This is most likely much faster than performing the
* calculation to determine the validity of the netmask.
*
* @param string $netmask Netmask
* @return bool true if syntax is valid, otherwise false
*/
function validateNetmask($netmask)
{
global $Net_IPv4_Netmask_Map;
if (! in_array($netmask, $Net_IPv4_Netmask_Map)) {
return(FALSE);
}
return(TRUE);
}
/**
* Parse a formatted IP address
*
* Given a network qualified IP address, attempt to parse out the parts
* and calculate qualities of the address.
*
* The following formats are possible:
*
* [dot quad ip]/[ bitmask ]
* [dot quad ip]/[ dot quad netmask ]
* [dot quad ip]/[ hex string netmask ]
*
* The first would be [IP Address]/[BitMask]:
* 192.168.0.0/16
*
* The second would be [IP Address] [Subnet Mask in quad dot notation]:
* 192.168.0.0/255.255.0.0
*
* The third would be [IP Address] [Subnet Mask as Hex string]
* 192.168.0.0/ffff0000
*
* @param string $ip IP address netmask combination
* @return object true if syntax is valid, otherwise false
*/
function parseAddress($address)
{
$myself = new Net_IPv4;
if (strchr($address, "/")) {
$parts = explode("/", $address);
if (! $myself->validateIP($parts[0])) {
return($myself->raiseError("invalid IP address"));
}
$myself->ip = $parts[0];
// Check the style of netmask that was entered
/*
* a hexadecimal string was entered
*/
if (eregi("^([0-9a-f]{2})([0-9a-f]{2})([0-9a-f]{2})([0-9a-f]{2})$", $parts[1], $regs)) {
// hexadecimal string
$myself->netmask = hexdec($regs[1]) . "." . hexdec($regs[2]) . "." .
hexdec($regs[3]) . "." . hexdec($regs[4]);
/*
* a standard dot quad netmask was entered.
*/
} else if (strchr($parts[1], ".")) {
if (! $myself->validateNetmask($parts[1])) {
return($myself->raiseError("invalid netmask value"));
}
$myself->netmask = $parts[1];
/*
* a CIDR bitmask type was entered
*/
} else if ($parts[1] > 0 && $parts[1] <= 32) {
// bitmask was entered
$myself->bitmask = $parts[1];
/*
* Some unknown format of netmask was entered
*/
} else {
return($myself->raiseError("invalid netmask value"));
}
$myself->calculate();
return($myself);
} else if ($myself->validateIP($address)) {
$myself->ip = $address;
return($myself);
} else {
return($myself->raiseError("invalid IP address"));
}
}
/**
* Calculates network information based on an IP address and netmask.
*
* Fully populates the object properties based on the IP address and
* netmask/bitmask properties. Once these two fields are populated,
* calculate() will perform calculations to determine the network and
* broadcast address of the network.
*
* @return mixed true if no errors occured, otherwise PEAR_Error object
*/
function calculate() {
$validNM = $GLOBALS["Net_IPv4_Netmask_Map"];
if (! is_a($this, "net_ipv4")) {
$myself = new Net_IPv4;
return($myself->raiseError("cannot calculate on uninstantiated Net_IPv4 class"));
}
/* Find out if we were given an ip address in dot quad notation or
* a network long ip address. Whichever was given, populate the
* other field
*/
if (strlen($this->ip)) {
if (! $this->validateIP($this->ip)) {
return($this->raiseError("invalid IP address"));
}
$this->long = ip2long($this->ip);
} else if (is_numeric($this->long)) {
$this->ip = long2ip($this->long);
} else {
return($this->raiseError("ip address not specified"));
}
/*
* Check to see if we were supplied with a bitmask or a netmask.
* Populate the other field as needed.
*/
if (strlen($this->bitmask)) {
$this->netmask = $validNM[$this->bitmask];
} else if (strlen($this->netmask)) {
$validNM_rev = array_flip($validNM);
$this->bitmask = $validNM_rev[$this->netmask];
} else {
return($this->raiseError("netmask or bitmask are required for calculation"));
}
$this->network = long2ip(ip2long($this->ip) & ip2long($this->netmask));
$this->broadcast = long2ip(ip2long($this->ip) |
(ip2long($this->netmask) ^ ip2long("255.255.255.255")));
return(TRUE);
}
/**
* Converts a dot-quad formmated IP address into a hexadecimal string
*/
function atoh($addr)
{
if (! Net_IPv4::validateIP($addr)) {
return(FALSE);
}
$ap = explode(".", $addr);
return(sprintf("%02x%02x%02x%02x",
$ap[0], $ap[1],
$ap[2], $ap[3]));
}
/**
* Converts a hexadecimal string into a dot-quad formatted IP address
*/
function htoa($addr)
{
if (eregi("^([0-9a-f]{2})([0-9a-f]{2})([0-9a-f]{2})([0-9a-f]{2})$",
$addr, $regs)) {
return(hexdec($regs[1]) . "." . hexdec($regs[2]) . "." .
hexdec($regs[3]) . "." . hexdec($regs[4]));
}
return(FALSE);
}
}
?>