Can't get login to work on MS Telnet

[styper]

I can't seem to get this to work with MS Telnet Server. The program just hangs

This is an output of a successful connection:

Trying 192.168.50.59...
Connected to 192.168.50.59.
Escape character is '^]'.
Welcome to Microsoft Telnet Service

login: erick
password:

*===============================================================
Microsoft Telnet Server.
*===============================================================

This is the code I'm using:

$host = '192.168.50.59';
$port = 23;
$telnet = TelnetClient::factory();
$telnet->connect("$host:$port");
var_dump($telnet->execute('erick', 'password:'));

This is what I get when I var_dump the buffer:

string(47) "Welcome to Microsoft Telnet Service

login: "

So the connection seems to be working as the buffer is loading but then it just hangs when I try to log in

[john-n-smith]

I'm afraid you're working against some design decisions that were based on telnet implementations from embedded devices. Other implementations (such as this one) seem to work a little differently.

I've released this small change that should allow you to work around them. Could you try the following (some tweaks may be necessary):

$dsn = '192.168.50.59:23';
$client = Graze\TelnetClient\TelnetClient::factory();

// server does not respond with consistent line ending - set this to null
$client->setLineEnding(null);
$client->connect($dsn);

// send something ("\r\n") to the server to trigger its initial response. Look for "login: " in the response
$resp = $client->execute("\r\n", "login: ");

// send username with line ending appended as it is no longer included. Look for "password: " prompt
$resp = $client->execute("erick\r\n", "password: ");

// send password with line ending. Look for welcome banner
$welcomePrompt = "*======="; //... full string or regex
$resp = $client->execute("my password\r\n", $welcomePrompt);
...

As $lineEnding is now null, it will have to be appended to each of your commands (if that's what the server is looking for to denote a send)

Let me know if it works.

[styper]

Thanks for the quick response. I had posted a comment before but deleted it since I forgot to update before the test.

Your change worked like a charm, this is the code used and the results:

$dsn = '192.168.50.59:23';
$client = TelnetClient::factory();
$client->setLineEnding(null);
$client->connect($dsn);
$resp = $client->execute("\r\n", "login: ");
var_dump($resp);
$resp = $client->execute("erick\r\n", "password: ");
var_dump($resp);
$welcomePrompt = "erick>";
$resp = $client->execute("erick\r\n", $welcomePrompt);
var_dump($resp);

object(Graze\TelnetClient\TelnetResponse)#134 (3) {
["isError":protected]=>
bool(false)
["responseText":protected]=>
string(40) "Welcome to Microsoft Telnet Service

"
["promptMatches":protected]=>
array(1) {
[0]=>
string(7) "login: "
}
}
object(Graze\TelnetClient\TelnetResponse)#142 (3) {
["isError":protected]=>
bool(false)
["responseText":protected]=>
string(21) "erick
login: erick
"
["promptMatches":protected]=>
array(1) {
[0]=>
string(10) "password: "
}
}
object(Graze\TelnetClient\TelnetResponse)#134 (3) {
["isError":protected]=>
bool(false)
["responseText":protected]=>
string(171) "

*===============================================================
Microsoft Telnet Server.
*===============================================================
C:\Users"
["promptMatches":protected]=>
array(1) {
[0]=>
string(6) "erick>"
}
}

Thank you very much!

[styper]

For reference this is a Windows 7 Professional machine using standard MS Telnet Server

[john-n-smith]

Glad you got it working 👍