Fonctions réseaux

Sommaire

checkdnsrr — Résolution DNS d'une adresse IP
closelog — Ferme la connexion à l'historique système
dns_check_record — Alias de checkdnsrr
dns_get_mx — Alias de getmxrr
dns_get_record — Lit les données DNS associées à un hôte
fsockopen — Ouvre un socket de connexion Internet ou Unix
gethostbyaddr — Retourne le nom d'hôte correspondant à une IP
gethostbyname — Retourne l'adresse IPv4 correspondant à un hôte
gethostbynamel — Retourne la liste d'IPv4 correspondante à un hôte
gethostname — Lit le nom de l'hôte
getmxrr — Retourne les enregistrements MX d'un hôte
getprotobyname — Retourne le numéro de protocole associé à un nom de protocole
getprotobynumber — Retourne le nom de protocole associé à un numéro de protocole
getservbyname — Retourne le numéro de port associé à un service Internet et un protocole
getservbyport — Retourne le service Internet qui correspond au port et protocole
header — Envoie un en-tête HTTP brut
header_register_callback — Enregistre une fonction de rappel pour l'envoi des en-têtes
header_remove — Supprime un en-tête HTTP
headers_list — Retourne la liste des en-têtes de réponse du script courant
headers_sent — Indique si les en-têtes HTTP ont déjà été envoyés
http_clear_last_response_headers — Efface les en-têtes de réponse HTTP stockées
http_get_last_response_headers — Récupère les derniers en-têtes de réponse HTTP
http_response_code — Récupère ou définit le code de réponse HTTP
inet_ntop — Convertit un paquet d'adresses internet en une représentation humainement lisible
inet_pton — Convertit une adresse IP lisible en sa représentation in_addr
ip2long — Convertit une chaîne contenant une adresse (IPv4) en notation décimale à point en une adresse entier long
long2ip — Convertit une adresse entier long (IPv4) en sa notation décimale à point
net_get_interfaces — Renvoie les interfaces réseau
openlog — Ouvre la connexion à l'historique système
pfsockopen — Ouvre un socket de connexion Internet ou Unix persistante
request_parse_body — Lit et analyse le corps de la requête et retourne le résultat
setcookie — Envoie un cookie
setrawcookie — Envoie un cookie sans encoder sa valeur en URL
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 — Génère un message dans l'historique système

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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 ¶

21 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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