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    User Contributed Notes 19 notes

    up
    15
    paul dot hodel at gmail dot com
    13 years ago
    After many non-sleep nights I got the most simple multi-client server written in PHP that really works. Ctrl+C and Ctrl+V... use as command line to test it. Enjoy it.

    <?php

    ini_set    ('error_reporting', E_ALL ^ E_NOTICE);
    ini_set('display_errors', 1);

    // Set time limit to indefinite execution
    set_time_limit (0);

    // Set the ip and port we will listen on
    $address = '10.203.9.67';
    $port = 6901;

    // Create a TCP Stream socket
    $sock = socket_create(AF_INET, SOCK_STREAM, 0);

    // Bind the socket to an address/port
    socket_bind($sock, $address, $port) or die('Could not bind to address');

    // Start listening for connections
    socket_listen($sock);

    // Non block socket type
    socket_set_nonblock($sock);

    // Loop continuously
    while (true)
    {
    unset(    $read);

    $j = 0;

    if (    count($client))
    {
    foreach (    $client AS $k => $v)
    {
    $read[$j] = $v;

    $j++;
    }
    }

    $client = $read;

    if (    $newsock = @socket_accept($sock))
    {
    if (    is_resource($newsock))
    {
    socket_write($newsock, "$j>", 2).chr(0);

    echo     "New client connected $j";

    $client[$j] = $newsock;

    $j++;
    }
    }

    if (    count($client))
    {
    foreach (    $client AS $k => $v)
    {
    if (@    socket_recv($v, $string, 1024, MSG_DONTWAIT) === 0)
    {
    unset(    $client[$k]);

    socket_close($v);
    }
    else
    {
    if (    $string)
    {
    echo     "$k: $string\n";
    }
    }
    }
    }

    //echo ".";

    sleep(1);
    }

    // Close the master sockets
    socket_close($sock);
    ?>
    up
    1
    philip at birk-jensen dot dk
    19 years ago
    I've been using the ICMP Checksum calculation function written by Khaless [at] bigpond [dot] com. But when having an odd length of data, it failed, so I made my own instead, which adds a 0 if the data length is odd:
    <?php
    function icmpChecksum($data)
    {
    // Add a 0 to the end of the data, if it's an "odd length"
    if (strlen($data)%2)
    $data .= "\x00";

    // Let PHP do all the dirty work
    $bit = unpack('n*', $data);
    $sum = array_sum($bit);

    // Stolen from: Khaless [at] bigpond [dot] com
    // The code from the original ping program:
    // sum = (sum >> 16) + (sum & 0xffff); /* add hi 16 to low 16 */
    // sum += (sum >> 16); /* add carry */
    // which also works fine, but it seems to me that
    // Khaless will work on large data.
    while ($sum>>16)
    $sum = ($sum >> 16) + ($sum & 0xffff);

    return     pack('n*', ~$sum);
    }
    ?>
    up
    0
    White-Gandalf
    17 years ago
    At the moment (2007-09), i don't find this extension in the PECL, but instead in the usual php extension directory. It needs to be included in the php-ini:

    extension = php_sockets.dll

    (or ".so" - whatever for your system).
    up
    -1
    davidccook+php at gmail dot com
    16 years ago
    Planning on sending integer values through as socket, I was surprised to find PHP only supports sending strings.
    I came to the conclusion the only way to do it would be to create a string that would evaluate to the same byte values as the integer I wanted to send. So (after much messing about) I created a couple of functions: one to create this 'string' and one to convert a received value back to an integer.

    <?php
    //Converts an integer to 'byte array' (string), default to 4 'bytes' (chars)
    function int2string($int, $numbytes=4)
    {
    $str = "";
    for (    $i=0; $i < $numbytes; $i++) {
    $str .= chr($int % 256);
    $int = $int / 256;
    }
    return     $str;
    }

    //Converts a 'byte array' (string) to integer
    function string2int($str)
    {
    $numbytes = strlen($str);
    $int = 0;
    for (    $i=0; $i < $numbytes; $i++) {
    $int += ord($str[$i]) * pow(2, $i * 8);
    }
    return     $int;
    }

    //Example
    echo int2string(16705, 2); // 16-bit integer converts to two bytes: 65, 65; which in turn is 'AA'
    echo string2int('AA'); //back the other way
    ?>
    up
    -1
    aeolianmeson at NOSPAM dot blitzeclipse dot com
    18 years ago
    There is a fantastic book on this library called 'TCP/IP Sockets in C' (ISBN 1558608265), that covers all of the ins and outs, quirks, and everything else that goes on. It's written for C, of course, but it could have easily been written for PHP with almost no serious code differences.

    Dustin
    up
    -1
    noSanity
    20 years ago
    I have searched long and hard for a ping script that does NOT use EXEC() or SYSTEM(). So far, I have found nothing, so I decided to write my own, which was a task to say the least.

    First off, I would like to thank Khaless for their checksum function, converting it from C looked like a task in itself.

    Here is the class I wrote
    <?php

    class Net_Ping
    {
    var     $icmp_socket;
    var     $request;
    var     $request_len;
    var     $reply;
    var     $errstr;
    var     $time;
    var     $timer_start_time;
    function     Net_Ping()
    {
    $this->icmp_socket = socket_create(AF_INET, SOCK_RAW, 1);
    socket_set_block($this->icmp_socket);
    }

    function     ip_checksum($data)
    {
    for(    $i=0;$i<strlen($data);$i += 2)
    {
    if(    $data[$i+1]) $bits = unpack('n*',$data[$i].$data[$i+1]);
    else     $bits = unpack('C*',$data[$i]);
    $sum += $bits[1];
    }

    while (    $sum>>16) $sum = ($sum & 0xffff) + ($sum >> 16);
    $checksum = pack('n1',~$sum);
    return     $checksum;
    }

    function     start_time()
    {
    $this->timer_start_time = microtime();
    }

    function     get_time($acc=2)
    {
    // format start time
    $start_time = explode (" ", $this->timer_start_time);
    $start_time = $start_time[1] + $start_time[0];
    // get and format end time
    $end_time = explode (" ", microtime());
    $end_time = $end_time[1] + $end_time[0];
    return     number_format ($end_time - $start_time, $acc);
    }

    function     Build_Packet()
    {
    $data = "abcdefghijklmnopqrstuvwabcdefghi"; // the actual test data
    $type = "\x08"; // 8 echo message; 0 echo reply message
    $code = "\x00"; // always 0 for this program
    $chksm = "\x00\x00"; // generate checksum for icmp request
    $id = "\x00\x00"; // we will have to work with this later
    $sqn = "\x00\x00"; // we will have to work with this later

    // now we need to change the checksum to the real checksum
    $chksm = $this->ip_checksum($type.$code.$chksm.$id.$sqn.$data);

    // now lets build the actual icmp packet
    $this->request = $type.$code.$chksm.$id.$sqn.$data;
    $this->request_len = strlen($this->request);
    }

    function     Ping($dst_addr,$timeout=5,$percision=3)
    {
    // lets catch dumb people
    if ((int)$timeout <= 0) $timeout=5;
    if ((int)    $percision <= 0) $percision=3;

    // set the timeout
    socket_set_option($this->icmp_socket,
    SOL_SOCKET, // socket level
    SO_RCVTIMEO, // timeout option
    array(
    "sec"=>$timeout, // Timeout in seconds
    "usec"=>0 // I assume timeout in microseconds
    )
    );

    if (    $dst_addr)
    {
    if (@    socket_connect($this->icmp_socket, $dst_addr, NULL))
    {

    } else {
    $this->errstr = "Cannot connect to $dst_addr";
    return     FALSE;
    }
    $this->Build_Packet();
    $this->start_time();
    socket_write($this->icmp_socket, $this->request, $this->request_len);
    if (@    socket_recv($this->icmp_socket, &$this->reply, 256, 0))
    {
    $this->time = $this->get_time($percision);
    return     $this->time;
    } else {
    $this->errstr = "Timed out";
    return     FALSE;
    }
    } else {
    $this->errstr = "Destination address not specified";
    return     FALSE;
    }
    }
    }

    $ping = new Net_Ping;
    $ping->ping("www.google.ca");

    if (    $ping->time)
    echo     "Time: ".$ping->time;
    else
    echo     $ping->errstr;

    ?>

    Hope this saves some troubles.

    noSanity
    up
    -1
    Khaless [at] bigpond [dot] com
    20 years ago
    I spent a while trying to use SOCK_RAW to send ICMP request packets so i could ping. This however lead me to need the internet checksum written as a php function, which was a little hard because of the way PHP handles variable types. Anyway, to save others the effort heres what i came up with, this returns Checksum for $data

    <?PHP
    // Computes Internet Checksum for $data
    // will return a 16-bit internet checksum for $data
    function inetChecksum($data)
    {
    // 32-bit accumilator, 16 bits at a time, adds odd bit on at end
    for($i=0;$i<strlen($data);$i += 2)
    {
    if(    $data[$i+1]) $bits = unpack('n*',$data[$i].$data[$i+1]);
    else     $bits = unpack('C*',$data[$i]);
    $sum += $bits[1];
    }

    // Fold 32-bit sum to 16 bits
    while ($sum>>16) $sum = ($sum & 0xffff) + ($sum >> 16);
    $checksum = pack('n1',~$sum);
    return     $checksum;
    }
    ?>

    And with this i was able to construct a correct PING Request.
    up
    -2
    roberto at spadim dot com dot br
    17 years ago
    Wake on Lan , working ok without configurations, and some features

    <?php
    function wake_on_lan($mac,$addr=false,$port=7) {
    //Usage
    // $addr:
    // You will send and broadcast tho this addres.
    // Normaly you need to use the 255.255.255.255 adres, so i made it as default. So you don't need
    // to do anything with this.
    // Since 255.255.255.255 have permission denied problems you can use addr=false to get all broadcast address from ifconfig command
    // addr can be array with broadcast IP values
    // $mac:
    // You will WAKE-UP this WOL-enabled computer, you need to add the MAC-addres here.
    // Mac can be array too
    //
    //Return
    // TRUE: When socked was created succesvolly and the message has been send.
    // FALSE: Something went wrong
    //
    //Example 1
    // When the message has been send you will see the message "Done...."
    // if ( wake_on_lan('00:00:00:00:00:00'))
    // echo 'Done...';
    // else
    // echo 'Error while sending';
    //
    if ($addr===false){
    exec("ifconfig | grep Bcast | cut -d \":\" -f 3 | cut -d \" \" -f 1",$addr);
    $addr=array_flip(array_flip($addr));
    }
    if(    is_array($addr)){
    $last_ret=false;
    for (    $i=0;$i<count($ret);$i++)
    if (    $ret[$i]!==false)
    $last_ret=wake_on_lan($mac,$ret[$i],$port);
    return(    $last_ret);
    }
    if (    is_array($mac)){
    $ret=array();
    foreach(    $mac as $k=>v)
    $ret[$k]=wake_on_lan($v,$addr,$port);
    return(    $ret);
    }
    //Check if it's an real MAC-addres and split it into an array
    $mac=strtoupper($mac);
    if (!    preg_match("/([A-F0-9]{1,2}[-:]){5}[A-F0-9]{1,2}/",$mac,$maccheck))
    return     false;
    $addr_byte = preg_split("/[-:]/",$maccheck[0]);

    //Creating hardware adress
    $hw_addr = '';
    for (    $a=0; $a < 6; $a++)//Changing mac adres from HEXEDECIMAL to DECIMAL
    $hw_addr .= chr(hexdec($addr_byte[$a]));

    //Create package data
    $msg = str_repeat(chr(255),6);
    for (    $a = 1; $a <= 16; $a++)
    $msg .= $hw_addr;
    //Sending data
    if (function_exists('socket_create')){
    //socket_create exists
    $sock = socket_create(AF_INET, SOCK_DGRAM, SOL_UDP); //Can create the socket
    if ($sock){
    $sock_data = socket_set_option($sock, SOL_SOCKET, SO_BROADCAST, 1); //Set
    if ($sock_data){
    $sock_data = socket_sendto($sock, $msg, strlen($msg), 0, $addr,$port); //Send data
    if ($sock_data){
    socket_close($sock); //Close socket
    unset($sock);
    return(    true);
    }
    }
    }
    @    socket_close($sock);
    unset(    $sock);
    }
    $sock=fsockopen("udp://" . $addr, $port);
    if(    $sock){
    $ret=fwrite($sock,$msg);
    fclose($sock);
    }
    if(    $ret)
    return(    true);
    return(    false);
    }
    ?>