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User Contributed Notes
네트워크 관련 함수 |
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oliviert at videotron dot ca
18-Feb-1999 09:31 |
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If u wanna do one of these function on windows95, u have to install the
lastest winsock before , if else php will crash with a message of
wsock32.dll
()
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philip at cornado dot c()m
04-Jul-2001 09:18 |
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View a few Networking PHP PEAR classes here :
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philip at cornado dot c()m
04-Jul-2001 09:20 |
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More socket functions can be seen here :
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philippe-at-cyberabuse.org
15-Dec-2001 02:46 |
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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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philippe-at-cyberabuse.org
12-Oct-2002 10:49 |
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... and this one will do the opposite (o return NULL for invalid netblocks)
:
1.0.0.0 1.0.255.255 -> 1.0.0.0/16
1.0.0.0 1.3.255.255 ->
1.0.0.0/14
192.168.0.0 192.168.0.255 ->
192.168.0.0/24
function ip2cidr($ip_start,$ip_end)
{
if(long2ip(ip2long($ip_start))!=$ip_start or
long2ip(ip2long($ip_end))!=$ip_end) return NULL;
$ipl_start=(int)ip2long($ip_start);
$ipl_end=(int)ip2long($ip_end);
if($ipl_start>0
&& $ipl_end<0) $delta=($ipl_end+4294967296)-$ipl_start;
else
$delta=$ipl_end-$ipl_start;
$netmask=str_pad(decbin($delta),32,"0","STR_PAD_LEFT");
if(ip2long($ip_start)==0
&& substr_count($netmask,"1")==32) return
"0.0.0.0/0";
if($delta<0 or ($delta>0 &&
$delta%2==0)) return NULL;
for($mask=0;$mask<32;$mask++)
if($netmask[$mask]==1)
break;
if(substr_count($netmask,"0")!=$mask) return
NULL;
return "$ip_start/$mask";
}
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trevor-hemsley at nospam dot dial dot pipex dot com
16-Oct-2002 06:53 |
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Previous example of IP range to CIDR list does not cope with ranges as well
as the perl Net::Netmask range2cidrlist() function. In PHP this looks
like
<?
function imask($this)
{
// use base_convert not
dechex because dechex is broken and returns 0x80000000 instead of
0xffffffff
return base_convert((pow(2,32) - pow(2, (32-$this)))), 10,
16);
}
function imaxblock($ibase, $tbit)
{
while ($tbit
> 0)
{
$im = hexdec(imask($tbit-1));
$imand = $ibase &
$im;
if ($imand !=
$ibase)
{
break;
}
$tbit--;
}
return
$tbit;
}
function range2cidrlist($istart, $iend)
{
// this
function returns an array of cidr lists that map the range given
$s =
explode(".", $istart);
// PHP ip2long does not handle leading
zeros on IP addresses! 172.016 comes back as 172.14, seems to be treated
as octal!
$start = "";
$dot = "";
while
(list($key,$val) = each($s))
{
$start =
sprintf("%s%s%d",$start,$dot,$val);
$dot =
".";
}
$end = "";
$dot = "";
$e
= explode(".",$iend);
while (list($key,$val) =
each($e))
{
$end =
sprintf("%s%s%d",$end,$dot,$val);
$dot =
".";
}
$start = ip2long($start);
$end =
ip2long($end);
$result = array();
while ($end >
$start)
{
$maxsize = imaxblock($start,32);
$x = log($end - $start
+ 1)/log(2);
$maxdiff = floor(32 - floor($x));
$ip =
long2ip($start);
if ($maxsize < $maxdiff)
{
$maxsize =
$maxdiff;
}
array_push($result,"$ip/$maxsize");
$start
+= pow(2, (32-$maxsize));
}
return $result;
}
?>
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03-Apr-2003 04:11 |
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Alternative cidr_conv function - a little easier to follow
function
cidr_conv($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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Function Reference
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