I need to telnet to cisco switch using php and execute show interface status
command and get results. I tried some php classes I found on internet but none of them could connect to device. So I tried to write the script myself, but I have the same problem, I cant connect to device.
The host sends me banner message and then new line with username:
.
I send my username with \r\n
, wait some time and tries to read data, but it looks to me like host is just ignoring my new line characters. This is response I got (explode('\n') on response):
Array
(
[0] => %
[1] => User Access Verification
[2] => Username: timeout expired!
)
Why didn't I get prompt on password? I tried it with sending telnet headers, and without, no change. Can anyone please help me?
Here is my code
<?
$host = "switchName";
$name = "name";
$pass = "pass";
$port = 23;
$timeOut = 15;
$connected = false;
$skipNullLines = true;
$timeout = 125000;
$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(0x41).chr(0x4E).chr(0x53).chr(0x49).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);
function read_string()
{
global $fw,$host,$skipNullLines;
$string = "";
while( !feof($fw) )
{
$read = fgets($fw);
$string .= $read;
// Probably prompt, stop reading
if( strpos($read, ':') !== FALSE || strpos($read, '> (enable)') !== FALSE || strpos($read, $host.'#') !== FALSE)
{ break; }
}
$string = explode("\n", $string);
// Get rid of null lines
$ret = array();
for($i = 0; $i<count($string); $i++)
{
if( trim($string[$i]) == '' && $skipNullLines ) continue;
$ret[] = $string[$i];
}
return $ret;
}
function send_string($string, $force=false)
{
GLOBAL $timeout,$fw;
$string = trim($string);
// execute only strings that are preceded by "show" (if not forced)
if(!$force && strpos($string, 'show ') !== 0)
{
return 1;
}
fputs($fw, $string."\r\n");
echo("SEND:".$string."\r\n");
usleep($timeout);
}
$fw = fsockopen($host, $port, $errno, $errorstr, $timeOut);
if($fw == false)
{
echo("Cant connect");
}
else
{
echo("Connected<br>");
$connected = true;
stream_set_timeout($fw, $timeout);
// fputs($fw, $header1);
// usleep($timeout);
// fputs($fw, $header2);
// usleep($timeout);
print_r(read_string());
send_string("test", true);
print_r(read_string());
}
fclose($fw);
?>
UPDATE If I send username at first, and then I read, I get password prompt. I dont understand it, why cant I firstly read messages from host and then send my response. The way it works to me now (send response and then read for prompt) is no-sense! (and I still got "% Authentication failed." message event with right password/name).
...
$connected = true;
stream_set_timeout($fw, $timeout);
send_string("name", true);
send_string("password", true);
print_r(read_string());
...
Okay, so I dont know what was the problem, but after "few" tests I was able to write this class that works for me. I dont know why other telnet classes dont work altough they do pretty much the same. So if anyone will have similar problem, you can try this:
PS: my devices prompt is "hostname#", so you may need to edit Login function to make this code work with prompt of your device (so you may need in GetOutputOf() )