tcp*() problems when connecting to brocade FC-Switches

[rudi]

Hi.

I cannot work out what's the constraint here

The general script layout is working fine for all our devices except the brocade fibrechannel switches:

; autoit 3.3.4.0


$IP = "10.28.33.8"
$Port = 23
$foo = ""
$trace = FileOpen("C:\temp\trace.txt", 2)

TCPStartup()
$Socket = TCPConnect($IP, $Port)
$start = TimerInit()


While 1
    $read = TCPRecv($Socket, 100)
    If $foo <> $read Then
        ConsoleWrite($read)
        FileWrite($trace, $read)
        $foo = $read
    EndIf
    If StringInStr($read, "login:") Then
        ExitLoop
    EndIf
    Sleep(25)
    If TimerDiff($start) > 5000 Then ExitLoop
WEnd
FileClose($trace)
TCPCloseSocket($Socket)
TCPShutdown()

ConsoleWrite(@CRLF & "done." & @CRLF)

The Brocade give me just this through the script:

ÿýÿý ÿý#ÿý'

All other devices, e.g. Cisco 3570 give that one:

--------- c:\temp\trace.txt -----------
ÿûÿûÿýÿý
 --- ALTBAU --- Cisco 3570 Stack. Giga-24-Port(Unten) = Master

User Access Verification

Password:

----------- EOF -----------

who knows, what I'm missing?

Regards, Rudi.

Edited February 19, 2010 by rudi

[rudi]

Hi.

I had to recognize, that TELNET can be much, much more complicated than I expected due to my experience so far:

These Brocade FC-Switches do a *LOT* of negotiation ( rubbish ) prior the main data exchange: Using wireshark I pulled out the HEX strings exchanged between a regular telnet session (MS TELNET.EXE) and the switch. This script is now working fine to get rid of the negotiation process:

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; autoit 3.3.4.0

#include <string.au3>

$IP = "10.28.33.8"
$Port = 23
$foo = ""
$trace = FileOpen("C:\temp\trace.txt", 2)

TCPStartup()
$Socket = TCPConnect($IP, $Port)
$start = TimerInit()

Dim $NegArr[14][2] = [[13], _ ; Negotiation Array: Telnet is neg.ing terminal type, echo, other rubbish...
        [_Hex("fffd18fffd20fffd23fffd27"), _Hex("fffb18fffb1f")], _
        [_Hex("fffd1f"), _Hex("fffb1ffffb20fffb18fffb27fffd01fffb03fffd03")], _
        [_Hex("fffb01fffd03fffb03")], _ ; no SEND to that one
        [_Hex("fffd18fffd20fffd23fffd27"), _Hex("fffb18fffb1f")], _
        [_Hex("fffd1f"), _Hex("fffc20fffc23fffb27")], _
        [_Hex("fffa2701fff0fffa1801fff0"), _Hex("fffa1f0078003cfff0")], _
        ["", _Hex("fffa2700fff0fffa1800414e5349fff0")], _ ; no RECV, just SEND
        [_Hex("fffb03fffd01fffb05fffd21"), _Hex("fffd03")], _
        ["", _Hex("fffb01fffe05fffc21")], _ ; no RECV, just SEND
        [_Hex("fffe01fffb010d0a0d0a466162726963204f5320284243312d4643535731290d0a"), _Hex("fffc01")], _
        ["", _Hex("fffd01")], _ ; no RECV, just SEND
        [_Hex("4661626f732056657273696f6e20362e322e30650d0a")], _ ; no SEND to that one
        [_Hex("0d0a0d0a4243312d4643535731206c6f67696e3a20"), _Hex("")]]

Dim $Pointer = 1, $sum = "", $foo = ""
While 1
    Sleep(25)
    If TimerDiff($start) > 5000 Then ExitLoop

    $read = TCPRecv($Socket, 100)
    If $foo <> $read Then
        ConsoleWrite($foo)
        $foo = $read
        $sum &= $read
    EndIf

    If $NegArr[$Pointer][0] = "" Then ; don't wait, just send next reply
        TCPSend($Socket, $NegArr[$Pointer][1])
        $Pointer += 1
    Else
        $Len = StringLen($NegArr[$Pointer][0])
        If StringRight($sum, $Len) = $NegArr[$Pointer][0] Then
            TCPSend($Socket, $NegArr[$Pointer][1])
            $Pointer += 1
        EndIf
    EndIf
    If $Pointer > $NegArr[0][0] Then ExitLoop
WEnd

ConsoleWrite(@CRLF & StringLen($sum) & " = länge" & @CRLF)


FileClose($trace)
TCPCloseSocket($Socket)
TCPShutdown()

ConsoleWrite(@CRLF & "done." & @CRLF)


Func _Hex($foo)
    ConsoleWrite($foo & " = ")
    $foo = _HexToString($foo)
    ConsoleWrite($foo & @CRLF)
    Return ($foo)

EndFunc   ;==>_Hex

Next will be to try the command dialog that I basically need.

BTW: Is there really no freeware scriptable telnet client? That lines above were interesting to learn about telnet, but it's not comfortable at all...

Regards, Rudi.

[enaiman]

Building "your own" telnet client looks like a big thing, but, telnet is much more complex than a simple TCP Send/Receive (you've experienced that).

I think you should use the windows Telnet client (using StdInWrite and StdOutRead you can really use it in a nice way) or putty or any other freeware you can find.

I haven't worked with putty yet but people say it's easy to work with.

[Sn3akyP3t3]

Rudi I recommend Putty as well for any scriptable Telnet, SSH, and Console needs especially with Cisco switches. I've tried other means of capturing logs or reading data from other client utilities, but none other than Putty have been practical. Putty allows for a logfile to be generated that is almost in real time with the running client to reflect what is on screen. The logfile can be parsed, although not directly, see my post on that if curious.

Here is some code you can use to apply to your own project. I appreciate suggestions for improvements.

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Func startPuttyTelnet()
    Run("C:\Program Files\PuTTY\putty.exe")
    WinWait("PuTTY Configuration")
    If Not WinActive("PuTTY Configuration") Then WinActivate("PuTTY Configuration")
    WinWaitActive("PuTTY Configuration")
    Send($sIpAddress) ;port 23 automatically selected
    Send("!t") ;select Telnet
    Send("+{TAB 3}")
    Sleep(250)
    Send("{DOWN}") ;enter logging options window
    ControlSend("PuTTY Configuration", "Log &file name:", "Edit1", "{DEL 10}")
    ;ControlSetText("PuTTY Configuration", "Log &file name:", "Edit1", $sPuttyLogFileLocation & "\Putty.log") ;disabled for workaround
    ControlSetText("PuTTY Configuration", "Log &file name:", "Edit1", $sTempPuttyFileLocation & "\Putty.log")
    If Not WinActive("PuTTY Configuration") Then WinActivate("PuTTY Configuration")
    WinWaitActive("PuTTY Configuration")
    ;select printable output
    Send("!p")
    If Not WinActive("PuTTY Configuration") Then WinActivate("PuTTY Configuration")
    WinWaitActive("PuTTY Configuration")
    ;select always overwrite existing log
    Send("!e{UP 3}")
    ;delete existing logfile to prevent handling leftover logfile from previous sessions masking problems
    If FileExists($sPuttyLogFileLocation & "\Putty.log") Then
        FileDelete($sPuttyLogFileLocation & "\Putty.log")
        FileDelete($sTempPuttyFileLocation & "\Putty.log") ;temporary workaround
    EndIf
    If Not WinActive("PuTTY Configuration") Then WinActivate("PuTTY Configuration")
    WinWaitActive("PuTTY Configuration")
    If Not WinActive("PuTTY Configuration") Then WinActivate("PuTTY Configuration")
    WinWaitActive("PuTTY Configuration")
    ControlClick("PuTTY Configuration", "&Open", "Button1")
EndFunc

Func startPuttySsh()
    Run("C:\Program Files\PuTTY\putty.exe")
    WinWait("PuTTY Configuration")
    If Not WinActive("PuTTY Configuration") Then WinActivate("PuTTY Configuration")
    WinWaitActive("PuTTY Configuration")
    Send($sIpAddress) ;port 22 automatically selected
    Send("!s") ;select SSh
    Send("+{TAB 3}")
    Sleep(250)
    Send("{DOWN}") ;enter logging options window
    ControlSend("PuTTY Configuration", "Log &file name:", "Edit1", "{DEL 10}")
    ;ControlSetText("PuTTY Configuration", "Log &file name:", "Edit1", $sPuttyLogFileLocation & "\Putty.log") ;disabled for workaround
    ControlSetText("PuTTY Configuration", "Log &file name:", "Edit1", $sTempPuttyFileLocation & "\Putty.log")
    If Not WinActive("PuTTY Configuration") Then WinActivate("PuTTY Configuration")
    WinWaitActive("PuTTY Configuration")
    ;select printable output
    Send("!p")
    If Not WinActive("PuTTY Configuration") Then WinActivate("PuTTY Configuration")
    WinWaitActive("PuTTY Configuration")
    ;select always overwrite existing log
    Send("!e{UP 3}")
    ;delete existing logfile to prevent handling leftover logfile from previous sessions masking problems
    If FileExists($sPuttyLogFileLocation & "\Putty.log") Then
        FileDelete($sPuttyLogFileLocation & "\Putty.log")
        FileDelete($sTempPuttyFileLocation & "\Putty.log") ;temporary workaround
    EndIf
    If Not WinActive("PuTTY Configuration") Then WinActivate("PuTTY Configuration")
    WinWaitActive("PuTTY Configuration")
    ControlClick("PuTTY Configuration", "&Open", "Button1")
    If WinWait("PuTTY Security Alert", "The server's host key is not cached", 5) Then
        If Not WinActive("PuTTY Security Alert") Then WinActivate("PuTTY Security Alert")
        WinWaitActive("PuTTY Security Alert")
        ControlClick("PuTTY Security Alert", "&Yes", "Button1")
    EndIf
EndFunc

For the full project download see here.