Funciones de red

Tabla de contenidos

checkdnsrr — Comprueba registros DNS correspondientes a un nombre de host de Internet dado o dirección IP
closelog — Cerrar conexión al log del sistema
dns_check_record — Alias de checkdnsrr
dns_get_mx — Alias de getmxrr
dns_get_record — Fetch DNS Resource Records associated with a hostname
fsockopen — Abre una conexión vía sockets a Internet o a un dominio Unix
gethostbyaddr — Obtener el nombre del host de Internet correspondiente a una dirección IP dada
gethostbyname — Obtener la dirección IPv4 que corresponde a un nombre de host de Internet dado
gethostbynamel — Obtener una lista de direcciones IPv4 que corresponde a un nombre de host de Internet dado
gethostname — Obtiene el nombre de host
getmxrr — Obtener los registros MX correspondientes a un nombre de host de Internet
getprotobyname — Obtener el número de protocolo asociado con el nombre de protocolo
getprotobynumber — Obtiene el nombre de protocolo asociado con un número de protocolo
getservbyname — Obtener el número de puerto asociado con un servicio y protocolo de Internet
getservbyport — Obtener el servicio de Internet que corresponde con el puerto y protocolo
header — Enviar encabezado sin formato HTTP
header_register_callback — Llamar a una función de cabecera
header_remove — Elimina encabezados previamente establecidos
headers_list — Devuelve una lista de encabezados de respuesta enviados (o listos para enviar)
headers_sent — Comprueba si o donde han enviado cabeceras
http_clear_last_response_headers — Clears the stored HTTP response headers
http_get_last_response_headers — Retrieve last HTTP response headers
http_response_code — Obtener o establecer el código de respuesta HTTP
inet_ntop — Convertir una dirección de internet empaquetada en una representación legible por humanos
inet_pton — Convertir una dirección IP legible por humanos a su representación in_addr empaquetada
ip2long — Convierte una cadena que contiene una dirección con puntos del Protocolo de Internet (IPv4) en una dirección apropiada
long2ip — Convierte una dirección de red (IPv4) en una cadena de texto en formato con puntos estándar de internet
net_get_interfaces — Get network interfaces
openlog — Open connection to system logger
pfsockopen — Abre Internet persistente o conexión de socket de dominio Unix
setcookie — Enviar una cookie
setrawcookie — Enviar una cookie sin codificar su valor
socket_get_status — Alias de stream_get_meta_data
socket_set_blocking — Alias de stream_set_blocking
socket_set_timeout — Alias de stream_set_timeout
syslog — Genera un mensaje log de sistema

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User Contributed Notes 10 notes

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claudiu at cnixs dot com ¶

17 years ago

A simple and very fast function to check against CIDR.

Your previous examples are too complicated and involves a lot of functions call.

Here it is (only with arithmetic operators and call only to ip2long () and split() ):
<?php
  function ipCIDRCheck ($IP, $CIDR) {
    list ($net, $mask) = split ("/", $CIDR);
    
    $ip_net = ip2long ($net);
    $ip_mask = ~((1 << (32 - $mask)) - 1);

    $ip_ip = ip2long ($IP);

    $ip_ip_net = $ip_ip & $ip_mask;

    return ($ip_ip_net == $ip_net);
  }
?>
call example: <?php echo ipCheck ("192.168.1.23", "192.168.1.0/24"); ?>

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Anton Avramov - lukav at lukav dot com ¶

7 years ago

An improved version of claudiu at cnixs dot com not using split and working with the following: 
ip: 192.168.101.123, CIRD: 192.168.101.144/24 

<?php 
function ipCIDRCheck ($IP, $CIDR) {
    list ($net, $mask) = explode ('/', $CIDR);
    
    $ip_net = ip2long ($net);
    $ip_mask = ~((1 << (32 - $mask)) - 1);

    $ip_ip = ip2long ($IP);

    return (($ip_ip & $ip_mask) == ($ip_net & $ip_mask));
  }
?>

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Anonymous ¶

8 years ago

improved version of philippe-at-cyberabuse.org's answer:

<?php
function cidrconv($net) { 
    $start = strtok($net,"/"); 
    $n = 3 - substr_count($net, "."); 
    if ($n > 0)
    {
        for ($i = $n;$i > 0; $i--)
            $start .= ".0";
    } 
    $bits1 = str_pad(decbin(ip2long($start)), 32, "0", STR_PAD_LEFT);
    $net = (1 << (32 - substr(strstr($net, "/"), 1))) - 1; 
    $bits2 = str_pad(decbin($net), 32, "0", STR_PAD_LEFT); 
    $final = "";
    for ($i = 0; $i < 32; $i++)
    { 
        if ($bits1[$i] == $bits2[$i]) $final .= $bits1[$i]; 
        if ($bits1[$i] == 1 and $bits2[$i] == 0) $final .= $bits1[$i]; 
        if ($bits1[$i] == 0 and $bits2[$i] == 1) $final .= $bits2[$i]; 
    } 
    return array($start, long2ip(bindec($final))); 
}
?>

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David GASTALDIN ¶

17 years ago

Here a IP-Range to CIDRs function that I wrote for the purpose of filling my Postfix client.cidr with ripe-ncc data to block spamming from useless countries. Strcmp functions are meant to work around the silly PHP string comparison which inevitably tries compare strings as numbers when possible. I'll make no comment about that fact ... bit I have to bite my tong hard :

function PlageVersCIDRs($ip_min, $ip_max) {
    $cidrs = array();
    $ip_min_bin = sprintf('%032b', $ip_min);
    $ip_max_bin = sprintf('%032b', $ip_max);
    $ip_cour_bin = $ip_min_bin;
    while (strcmp($ip_cour_bin, $ip_max_bin) <= 0) {
        $lng_reseau = 32;
        $ip_reseau_bin = $ip_cour_bin;
        while (($ip_cour_bin[$lng_reseau - 1] == '0') && (strcmp(substr_replace($ip_reseau_bin, '1', $lng_reseau - 1, 1), $ip_max_bin) <= 0)) {
            $ip_reseau_bin[$lng_reseau - 1] = '1';
            $lng_reseau--;
        }
        $cidrs[] = long2ip(bindec($ip_cour_bin)).'/'.$lng_reseau;
        $ip_cour_bin = sprintf('%032b', bindec($ip_reseau_bin) + 1);
    }
    return $cidrs;
}

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philippe-at-cyberabuse.org ¶

22 years ago

PHP miss CIDR functions.



This one will convert a CIDR like this:

0.0.0.0/16 -> 0.0.0.0 - 0.0.255.255

127.0/16 -> 127.0.0.0 - 127.0.255.255

etc...



function cidrconv($net) {

$start=strtok($net,"/");

$n=3-substr_count($net, ".");

if ($n>0) { for ($i=$n;$i>0;$i--) $start.=".0"; }

$bits1=str_pad(decbin(ip2long($start)),32,"0","STR_PAD_LEFT");

$net=pow(2,(32-substr(strstr($net,"/"),1)))-1;

$bits2=str_pad(decbin($net),32,"0","STR_PAD_LEFT");

for ($i=0;$i<32;$i++) {

if ($bits1[$i]==$bits2[$i]) $final.=$bits1[$i];

if ($bits1[$i]==1 and $bits2[$i]==0) $final.=$bits1[$i];

if ($bits1[$i]==0 and $bits2[$i]==1) $final.=$bits2[$i];

}

return $start." - ".long2ip(bindec($final));

}

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-1

nexxer at rogers dot com ¶

19 years ago

In Trevor Hemsley's translation of the perl range2cidr function, the 

while ($end > $start) 

condition should be

while ($end >= $start)

otherwise it won't work for /32s, ie if you feed range2cidr("1.2.3.4", "1.2.3.4").

-- nex

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-2

-dR ¶

9 years ago

This little function might come in handy

<?php
function cidr_range( $cidr, $chkip=null )
{
    // Assign IP / mask
    list($ip,$mask) = explode("/",$cidr);

    // Sanitize IP
    $ip1 = preg_replace( '_(\d+\.\d+\.\d+\.\d+).*$_', '$1', "$ip.0.0.0" );

    // Calculate range
    $ip2 = long2ip( ip2long( $ip1 ) - 1 + ( 1 << ( 32 - $mask) ) );

    // are we cidr range cheking?
    if ( $chkip != null && ! filter_var( $chkip, FILTER_VALIDATE_IP, FILTER_FLAG_IPV4) === false )
    {
        return ip2long( $ip1 ) <= ip2long( $chkip ) && ip2long( $ip2 ) >= ip2long( $chkip ) ? true : false;
    } else {
        return "$ip1 - $ip2";
    }
}

var_dump( cidr_range( "127.0/16", "127.0.0.1" ) );   // bool(true)
var_dump( cidr_range( "127.0/16", "192.168.0.1" ) ); // bool(false)
var_dump( cidr_range( "192.168.0.0/24" ) );          // string(27) "192.168.0.0 - 192.168.0.255"

?>

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-2

Anonymous ¶

21 years ago

Alternative cidr_conv function - a little easier to follow

function cidr_conv($cidr_address) {
  $first = substr($cidr_address, 0, strpos($cidr_address, "/"));
  $netmask = substr(strstr($cidr_address, "/"), 1);

  $first_bin = str_pad(decbin(ip2long($first)), 32, "0", STR_PAD_LEFT);
  $netmask_bin = str_pad(str_repeat("1", (integer)$netmask), 32, "0", STR_PAD_RIGHT);
  
  for ($i = 0; $i < 32; $i++) {
    if ($netmask_bin[$i] == "1") 
      $last_bin .= $first_bin[$i];
    else
      $last_bin .= "1";
  }

  $last = long2ip(bindec($last_bin));

  return "$first - $last";
}

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-4

samuele at norsam dot org ¶

20 years ago

To find if an IP is in a net/mask (very fast):
<?php
function isIPIn($ip,$net,$mask) {
   $lnet=ip2long($net);
   $lip=ip2long($ip);
   $binnet=str_pad( decbin($lnet),32,"0","STR_PAD_LEFT" );
   $firstpart=substr($binnet,0,$mask);
   $binip=str_pad( decbin($lip),32,"0","STR_PAD_LEFT" );
   $firstip=substr($binip,0,$mask);
   return(strcmp($firstpart,$firstip)==0);
   }
?>

This function can be compacted, avoiding some variable settings, but the function will not be too clear to read...
Example code, used to made a kind of location service network-based:

<?php
$n = array ( "192.168.0.0/16"   => "TUSCANY",
             "192.168.1.0/24"   => "- Florence",
             "192.168.2.0/24"   => "- Pisa",
             "192.168.3.0/24"   => "- Siena",
             "192.168.64.0/21" => "- Tuscan Archipelago",
             "192.168.64.0/23" => "--- Elba Island",
             "192.168.66.0/24" => "--- Capraia Island",
             "192.168.67.0/24" => "--- Giannutri Island");

// Normally you should use the following line
$myip = $HTTP_SERVER_VARS['REMOTE_ADDR'];
// This is first example: returns Tuscany/Pisa
$myip = "192.168.2.33";
// This is second example: returns Tuscany/T.Arch./Elba
$myip = "192.168.65.34";

echo "Your position:<br />\n";
foreach ( $n as $k=>$v ) {
   list($net,$mask)=split("/",$k);
   if (isIPIn($myip,$net,$mask)) {
       echo $n[$k]."<br />\n"; }
   }
?>

and so on...

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-5

dand at ddchosting.com ¶

18 years ago

When I was working on a project I ran into this problem with redirecting. My solution is as follows:

header("Refresh: 5; url=../main/main.php?".session_id()."");



This allowed me to pass the session_id() which is used throughout site to make sure user has loged in. 

I hope this helps!

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