PHP Read from socket on windows machine

Question

I am trying to write a "simple" PHP program that should write and read string to/from a socket (telnet on port 23).

Socket Connection is made using pfsockopen (or socket_connect) function and it seems to work properly (verified with wireshark). The problem is when I try to read from socket using fread or socket_read. The buffer returned by these two functions is unreadable (no text but special ascii characters).

Consider that php script is running on a Windows XP PC. Do you know about any limitation in using these libraries on windows PC and telnet protocol?

    $header1=chr(0xFF).chr(0xFB).chr(0x1F).chr(0xFF).chr(0xFB).chr(0x20).chr(0xFF).chr(0xFB).chr(0x18).chr(0xFF).chr(0xFB).chr(0x27).chr(0xFF).chr(0xFD).chr(0x01).chr(0xFF).chr(0xFB).chr(0x03).chr(0xFF).chr(0xFD).chr(0x03).chr(0xFF).chr(0xFC).chr(0x23).chr(0xFF).chr(0xFC).chr(0x24).chr(0xFF).chr(0xFA).chr(0x1F).chr(0x00).chr(0x50).chr(0x00).chr(0x18).chr(0xFF).chr(0xF0).chr(0xFF).chr(0xFA).chr(0x20).chr(0x00).chr(0x33).chr(0x38).chr(0x34).chr(0x30).chr(0x30).chr(0x2C).chr(0x33).chr(0x38).chr(0x34).chr(0x30).chr(0x30).chr(0xFF).chr(0xF0).chr(0xFF).chr(0xFA).chr(0x27).chr(0x00).chr(0xFF).chr(0xF0).chr(0xFF).chr(0xFA).chr(0x18).chr(0x00).chr(0x58).chr(0x54).chr(0x45).chr(0x52).chr(0x4D).chr(0xFF).chr(0xF0);

$fp=pfsockopen("10.129.127.33",23);
fputs($fp,$header1);
sleep(1);
$output=fread($fp,8164); 
echo $output;

Can you post some code.. especially how you connect and how you read the connection — bart s
– bart s, Commented May 29, 2012 at 13:13
$fp=pfsockopen("10.129.127.33",23); fputs($fp,$TELNETHEADER); sleep(1); $output=fread($fp,1024); $stat=socket_get_status($fp); $output.=fread($fp, $stat["unread_bytes"]); — Luca Carangelo
– Luca Carangelo, Commented May 29, 2012 at 13:26
yes of course. The problem is the fread. These are the characted printed out ²% ²▼ ■ ²↑ ²' ¹☺ ²♥ ¹♥ — Luca Carangelo
– Luca Carangelo, Commented May 29, 2012 at 13:34
Have you looked into telnet protocol (en.wikipedia.org/wiki/Telnet)? I think it's expected to get bytes with high bit set. — Nikolai Fetissov
– Nikolai Fetissov, Commented May 29, 2012 at 13:39

Vikram Aditya · Accepted Answer · 2015-11-14 19:58:15Z

Is the the connection Successful?
Does the server allow connection on port 23?
This might help you

fputs($fp,"string");

do 
{ 
$output.=fread($fp, 80); 
// read line by line, or at least small chunks
$stat=socket_get_status($fp);
}
while($stat["unread_bytes"]);

$output = str_replace("\n", "<br>", $output);\\for new line in HTML
echo $output;

Following is the TELNET header i have used

$header1=chr(0xFF).chr(0xFB).chr(0x1F).chr(0xFF).chr(0xFB).chr(0x20).chr(0xFF).chr(0xFB).chr(0x18).chr(0xFF).chr(0xFB).chr(0x27).chr(0xFF).chr(0xFD).ch.(0x01).chr(0xFF).chr(0xFB).chr(0x03).chr(0xFF).chr(0xFD).chr(0x03).chr(0xFF).chr(0xFC).chr(0x23).chr(0xFF).chr(0xFC).chr(0x24).chr(0xFF).chr(0xFA).chr(0x1F).chr(0x00).chr(0x50).chr(0x00).chr(0x18).chr(0xFF).chr(0xF0).chr(0xFF).chr(0xFA).chr(0x20).chr(0x00).chr(0x33).chr(0x38).chr(0x34).chr(0x30).chr(0x30).chr(0x2C).chr(0x33).chr(0x38).chr(0x34).chr(0x30).chr(0x30).chr(0xFF).chr(0xF0).chr(0xFF).chr(0xFA).chr(0x27).chr(0x00).chr(0xFF).chr(0xF0).chr(0xFF).chr(0xFA).chr(0x18).chr(0x00).chr(0x58).chr(0x54).chr(0x45).chr(0x52).chr(0x4D).chr(0xFF).chr(0xF0);
        $header2=chr(0xFF).chr(0xFC).chr(0x01).chr(0xFF).chr(0xFC).chr(0x22).chr(0xFF).chr(0xFE).chr(0x05).chr(0xFF).chr(0xFC).chr(0x21);

$fp=fsockopen("192.168.125.6",23);  


//**********Send telnet header****************

fputs($fp,$header1);

usleep(1000);

fputs($fp,$header2);

usleep(1000);

Darshan DS Rooprai · Accepted Answer · 2017-12-04 19:10:11Z

<?php
# Generating output by telneting a router

$username='myusername';
$password='mypassword';
$ip="192.168.0.1";

    $Telnet_Header = chr(0xFF).chr(0xFB).chr(0x1F).chr(0xFF).chr(0xFB).chr(0x20).chr(0xFF).chr(0xFB).chr(0x18).chr(0xFF).chr(0xFB).chr(0x27).chr(0xFF).chr(0xFD).chr(0x01).chr(0xFF).chr(0xFB).chr(0x03).chr(0xFF).chr(0xFD).chr(0x03).chr(0xFF).chr(0xFC).chr(0x23).chr(0xFF).chr(0xFC).chr(0x24).chr(0xFF).chr(0xFA).chr(0x1F).chr(0x00).chr(0x50).chr(0x00).chr(0x18).chr(0xFF).chr(0xF0).chr(0xFF).chr(0xFA).chr(0x20).chr(0x00).chr(0x33).chr(0x38).chr(0x34).chr(0x30).chr(0x30).chr(0x2C).chr(0x33).chr(0x38).chr(0x34).chr(0x30).chr(0x30).chr(0xFF).chr(0xF0).chr(0xFF).chr(0xFA).chr(0x27).chr(0x00).chr(0xFF).chr(0xF0).chr(0xFF).chr(0xFA).chr(0x18).chr(0x00).chr(0x58).chr(0x54).chr(0x45).chr(0x52).chr(0x4D).chr(0xFF).chr(0xF0);
$Telnet_Header2 = chr(0xFF).chr(0xFC).chr(0x01).chr(0xFF).chr(0xFC).chr(0x22).chr(0xFF).chr(0xFE).chr(0x05).chr(0xFF).chr(0xFC).chr(0x21);
$Port = 23;
$Conn = fsockopen($ip, $Port);
fputs($Conn,$Telnet_Header);
sleep(1);
fputs($Conn,$Telnet_Header2);
sleep(1);
fputs($Conn,$username."\r");
sleep(5);
fputs($Conn,$password."\r");
sleep(1);
fputs($Conn,$username."\r");
sleep(5);
fputs($Conn,$password."\r");
sleep(5);
fputs($Conn,"en \r"); 
   sleep(3);
fputs($Conn,"conf t\r"); 
   sleep(3);
fputs($Conn,"terminal length 0\r"); 
   sleep(3);
fputs($Conn,"sh run\r"); 

   $output="";
do
{
    $output.=fread($Conn, 1000);
    $stat=socket_get_status($Conn);
}while($stat["unread_bytes"]);
$output = explode("\n", $output);
for ($i=6;$i<count($output)-1;$i++)
    {
    echo ($output[$i]."\n");
    }

?>

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