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birdofprey

TCP headache. Trying to create server and client side apps, in oder to remote shutdown a computer

8 posts in this topic

The helpfiles are really thin on this topic. I tried to figure out what I was doing wrong on my own, but I now have to stop wasting my time cause I have no clue. Hopefully all I ask for here is one minute from your time to spot the problem.

Except the comments regarding the script, I'd like to ask a few other questions related to this

How do I close a port ? Or a connection ?

Can I send data backwards ( to the initiator of an incoming connection) ?

Comments regarding security issues are also more than welcome.

; SERVER - LISTENING - RECEIVES AND EXECUTES COMMANDS
#region
Global $myip = "127.0.0.1"
Global $myport = 1117
; server's coordinates

Global $remoteip = "127.0.0.1"
Global $remoteport = 1000
;remote's coordinates

Global $passkey = "#32342345#32f"
Global $markstart = "~!2!"
Global $markend = "@#$SEEE3112"
;general variables (temporary values)

Global $handshake
Global $listeningsocket
Global $ConnectedlisteningSocket

Global $rm  ; received message
Global $sm  ; sent message
#endregion

Listen()

While 1
;~  $rm = _TCPRecieveText ($ConnectedlisteningSocket)
    $rm = TCPRecv ($ConnectedlisteningSocket, 1024)
    If $rm <> "" Then
        ConsoleWrite ( $rm & " <" & @LF )
        Msgbox ( 0, "", $rm & " <")
    EndIf
    Sleep ("500")
Wend

Func Listen()
    TCPStartup ()
    $listeningsocket = TCPListen ($myip, $myport, 100) ; define socket
    $ConnectedlisteningSocket = TCPAccept($listeningsocket) ;permit incoming
EndFunc

Func msg($message)
;~  if $myip = "" then $myip = _GetMyIP()
    $mssg = $passkey & "|" & $message & "|" & $myip & "|" & $myport & "|" & $markend ;passkey will be generated randomly...
    Return $mssg
EndFunc

Func demsg($message)
    Local $m
    $m = StringSplit($message, '|')
    If $m[0] = 5 And $m[1] = $passkey And $m[3] = $myip And $m[4] = $myport And $m[5] = $markend Then ; I could use this to change port randomly
        Return $m[2]
    Else 
        ConsoleWrite ( "-- CHECK THIS OUT: " & $message )
    EndIf
EndFunc

Func _TCPRecieveText ($iSocket)
    Local $vBuffer = ""
    Local $iBytes = -1
    
    While 1
        $vBuffer &= TCPRecv ($iSocket, 1024)
        If $iBytes = -1 And StringInStr ($vBuffer, $markstart) Then
            $iBytes = StringLeft ($vBuffer, StringInStr ($vBuffer, ",")-1)
            $vBuffer = StringTrimLeft ($vBuffer, StringInStr ($vBuffer, ","))
        Else
            If StringLen ($vBuffer) = $iBytes Then 
                $vBuffer = demsg ($vBuffer)
                ExitLoop
            EndIf
        EndIf
    WEnd
    
    Return $vBuffer
EndFunc

Func _TCPSendText ($iSocket, $vData)
    Local $vBuffer = ""
    $vData = msg ($vData)
    $vBuffer = StringLen ($vData) & $markstart & $vData
    TCPSend ($iSocket, $vBuffer)
EndFunc

Func Checkip(Byref $iptocheck)
    Local $t_ip
    $t_ip = StringSplit($iptocheck, '.')
    If $t_ip[0] = 4 And StringIsDigit($t_ip[1]) And StringIsDigit($t_ip[2]) And StringIsDigit($t_ip[3]) And StringIsDigit($t_ip[4]) Then
        Return $iptocheck
    Else
        MsgBox (0, "RSDC", "Invalid IP Address" )
    EndIf
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Thanks in advance

PS: what's the BB code for setting the hight of these codeboxes ?

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Is that really that hard ? Where could I find more detailed information regarding this ?

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Replace Sleep("500") with Sleep(500)

Also, I noticed that you try to accept the client right away. Meaning it will almost always $ConnectedlisteningSocket will be -1.

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Replace Sleep("500") with Sleep(500)

Also, I noticed that you try to accept the client right away. Meaning it will almost always $ConnectedlisteningSocket will be -1.

Whoops. Sleep ("500") ?! I guess that's what happens when you get lost between flawed examples and incomplete examples about TCP. This thread Tcp explained finally put an end to this.

Thanks Chip !

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Scripts & functions Organize Includes Let Scite organize the include files

Yahtzee The game "Yahtzee" (Kniffel, DiceLion)

LoginWrapper Secure scripts by adding a query (authentication)

_RunOnlyOnThis UDF Make sure that a script can only be executed on ... (Windows / HD / ...)

Internet-Café Server/Client Application Open CD, Start Browser, Lock remote client, etc.

MultipleFuncsWithOneHotkey Start different funcs by hitting one hotkey different times

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#6 ·  Posted (edited)

I have a client & server program to do exatcly this, if you want I can send you the codes in .txt, or give you a link for them. Just let me know. :)

Edited by LiquidPerceptions

"I'm not here to make decisions, I'm here to make a difference"

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in oder to remote shutdown a computer

Why not just use shutdown? shutdown targetcomputer parameters, etc...

...by the way, it's pronounced: "JIF"... Bob Berry --- inventor of the GIF format

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#8 ·  Posted (edited)

I kinda get lost there, but thank you. I haven't had the time yet, I'll have a closer look at it.

I have a client & server program to do exatcly this, if you want I can send you the codes in .txt, or give you a link for them. Just let me know. :)

Hurray. You'd save me hours of coding, probably, eventhough I'd most likely adapt things a bit. Use the method that's easier for you. Thank you very much in advance.

Why not just use shutdown? shutdown targetcomputer parameters, etc...

I don't know. Is that some windows command ? Never heard of it. If it is, that remote computer should "open up" to receive such commands, and I'm not sure I want to do that. Also... I want to be able to cancel the command and I want to be able to set the remote pc into hibernation sometimes.

Anyhow, with all these examples, I should be able by now to put things together, if I only had the time... the only issue left is: I really don't want to dig a hole into that systems security with my program, as this won't be used for a private network, but over the internet. As you see in the code probably, I tried to take some very rudimentary and most likely inefficient and useless preventive mesures to prevent bad things from happening.

Is there a general thread about networking security somewhere by any chance ?

Edit: typo

Edited by birdofprey

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