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Bug #24123 proc_open Apache 1.3.27 with php 4.3.2
Submitted: 2003-06-11 08:43 UTC Modified: 2003-08-09 20:10 UTC
From: zambrow at hotmail dot com Assigned:
Status: Not a bug Package: Program Execution
PHP Version: 4.3.2 OS: Windows 2000
Private report: No CVE-ID: None
View Developer Edit
 [2003-06-11 08:43 UTC] zambrow at hotmail dot com 
Apache 1.3.27 with php 4.3.2.   I'm tryin to implement a way to do a 2-way communication through telnet for my script
here's what I've found! (111.111.111.111 example ip is a unix box and it is accepting telnet connections"
Consider this.

$failed = false; // authentication failure flag
$cmd="telnet 111.111.111.111";
$descriptorspec = array(
   0 => array("pipe", "r"),  // stdin is a pipe that the child will read from
   1 => array("pipe", "w"),  // stdout is a pipe that the child will write to
   2 => array("pipe", "w") // stderr is a pipe that the child will write to
);
$userID="user";
$password="password";
$process = proc_open("$cmd", $descriptorspec, $pipes);
echo $process;
if (is_resource($process)) {
    fwrite($pipes[0], "$userID\r");
    fwrite($pipes[0], "$password\r");
     fwrite($pipes[1], "exit\r");
    while(!feof($pipes[1])) {
        $line = fgets($pipes[1], 1024);
        $loginFailed = strpos($line, "invalid login name or password");
        if ($loginFailed != false)
        {	$failed = true;
        	// echo "FAILED LOGGING";
        }
        // DEBUG OUTPUT 
         echo $line;
         echo "---<br>";         
    } 
    fclose($pipes[1]);
    $return_value = proc_close($process);
    echo "<br><b>command returned<b> $return_value\n";
}
The following will result in empty pipes[1].  I'm unable to get anything out of that pipe as well the fgets just seems to hang.  when i try the same code on AIX platform it works.  So i'm thinking its a bug...

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 [2003-06-11 08:55 UTC] wez@php.net 
Your script is broken (why are you writing "exit" to $pipes[1]?).

Can you please indicate what you expect to see, and what you actually end up with?
Add this line after the proc_open call:
debug_zval_dump($pipes);

Also note that for telnet on most unix platforms, you need to run it via the "expect" utility to correctly emulate an interactive tty. (I know this is listed as a win32 issue, but its worth mentioning this in any case).
 [2003-06-11 13:56 UTC] zambrow at hotmail dot com 
the fwrite($pipes[1], "exit\r");
was just my mistake i made during debugging but it doesnt change anything
I expect to see in pipes[1] the ouput of my telnet session. for example writing ls to pipes[0] should result in pipes[1] having the output of ls command in the running directory.
Adding your debugging function does not change anything.  The script will still just sit there for a long while and in the end it'll load empty page.
Note i'm doing this on Windows 2000 machine. and my target os is AIX.  if i run the script on AIX to AIX platform this seems to work
 [2003-08-09 20:10 UTC] pollita@php.net 
I presume you're using the stock "telnet" application delivered with Win2000.  This program does not permit communicating via redirected pipes.  This is most directly illustrated by the following command:

C:\> telnet 111.111.111.111 > telnet.log

One would expect telnet to behave nicely and send the welcoming "login:" prompt to the telnet.log.  However, it simply bails because Windows Telnet doesn't like redirected pipes.

Thank Billy for that.

Unfortunately this isn't a bug in PHP and hence isn't something we can do anything to correct.
 
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