Question

How can i create a Winsock(Telnet) connection to UNIX, and invoke unix commands through the telnet?

Asked by: twistedcode

hi =) i'm just new in programming with winsock, so far, what i'm trying to do now is establish a connection to a remote unix server using  the winsock telnet protocol(port 23). I'm hoping to use this connection to Send local files, Access, and Retrieve remote files from Unix(i'd appreciate help on this too.)  but everytime i'm able to connect to the unix server, it returns :   ÿýÿýÿý#ÿý'ÿý$

i don't know what this means.  i'm not sure if this is raw data from unix that windows cannot decode to human readable format or if it is the actual data that i should respond to. i don't know how to communicate with the unix server from here, much more, i don't think i was able to login the unix server itself coz i couldn't even see the 'LOGIN:' prompt.  

i need to know urgently, any help would be greatly appreciated!  Thank You in Advance!!

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Asked On
2003-06-03 at 19:54:37ID20635974
Tags

unix

,

winsock

Topics

Visual Basic Programming

,

Winsock

Participating Experts
3
Points
100
Comments
11

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Answers

 

by: RavenOfThoughtPosted on 2003-06-03 at 20:15:25ID: 8644728

VERSION 5.00
Object = "{248DD890-BB45-11CF-9ABC-0080C7E7B78D}#1.0#0"; "MSWINSCK.OCX"
Begin VB.Form Form1
   Caption         =   "Form1"
   ClientHeight    =   5535
   ClientLeft      =   60
   ClientTop       =   345
   ClientWidth     =   8655
   LinkTopic       =   "Form1"
   ScaleHeight     =   5535
   ScaleWidth      =   8655
   StartUpPosition =   3  'Windows Default
   Begin VB.CommandButton cmdClear
      Caption         =   "Clear"
      Height          =   495
      Left            =   2640
      TabIndex        =   3
      Top             =   4920
      Width           =   2175
   End
   Begin MSWinsockLib.Winsock Winsock1
      Left            =   0
      Top             =   0
      _ExtentX        =   741
      _ExtentY        =   741
      _Version        =   393216
   End
   Begin VB.CommandButton cmdConnect
      Caption         =   "Connect"
      Height          =   495
      Left            =   120
      TabIndex        =   2
      Top             =   4920
      Width           =   2175
   End
   Begin VB.TextBox txtOutgoing
      Height          =   285
      Left            =   120
      TabIndex        =   1
      Top             =   4440
      Width           =   8415
   End
   Begin VB.TextBox txtIncoming
      Height          =   4215
      Left            =   120
      MultiLine       =   -1  'True
      ScrollBars      =   2  'Vertical
      TabIndex        =   0
      Top             =   120
      Width           =   8415
   End
End
Attribute VB_Name = "Form1"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = False
Option Explicit

Private Sub cmdClear_Click()
    txtIncoming.Text = ""
End Sub

Private Sub cmdConnect_Click()
    Winsock1.Close
    Winsock1.Connect "Hostname", 23
End Sub

Private Sub txtIncoming_Change()
    txtIncoming.SelStart = Len(txtIncoming.Text)
End Sub

Private Sub txtOutgoing_KeyPress(KeyAscii As Integer)
    If Winsock1.State = 7 Then
        Winsock1.SendData Chr(KeyAscii)
        If KeyAscii = vbKeyReturn Then
            txtIncoming.Text = txtIncoming.Text & txtOutgoing.Text & vbNewLine
            txtOutgoing.Text = ""
        End If
    Else
        MsgBox "Not Connected to Server!"
        txtOutgoing.Text = ""
    End If
End Sub

Private Sub Winsock1_Close()
    Winsock1.Close
    txtIncoming.Text = txtIncoming.Text & "***Connection Closed***" & vbNewLine
End Sub

Private Sub Winsock1_Connect()
    txtIncoming.Text = txtIncoming.Text & "***Connected to " & Winsock1.RemoteHost & "***" & vbNewLine
End Sub

Private Sub Winsock1_DataArrival(ByVal bytesTotal As Long)
    Dim strData As String
    Winsock1.GetData strData
    strData = Replace(strData, vbLf, "")
    strData = Replace(strData, vbCr, vbNewLine)
    txtIncoming.Text = txtIncoming.Text & strData & vbNewLine
End Sub

 

by: RavenOfThoughtPosted on 2003-06-03 at 20:17:47ID: 8644736

This is a basic Telnet client using the Winsock control. Notice that it sends each character as soon as it is typed--this is how telnet servers accept stuff from the terminal.

 

by: RavenOfThoughtPosted on 2003-06-03 at 20:18:16ID: 8644737

Save this as a ".frm" file ;-)

 

by: twistedcodePosted on 2003-06-03 at 20:42:09ID: 8644859

Thanks for the prompt reply RavenofThought!

unfortunately, it still returns the same message( ÿýÿýÿý#ÿý'ÿý$) after connection has been made. actually i've tried coding something similar before but like the this one, it didn't work for me....i'm sorry bout that...  i'm still hoping to be able to read/understand what UNIX is returning to me.

another thing is, the txtincoming only reflected the text i typed in txtoutgoing, which are usually UNIX commands, i was hoping to get results to those commands(e.g. pwd, ls, etc.) hope you can still help me out on this...



thank you very much!

 

by: RavenOfThoughtPosted on 2003-06-03 at 21:12:47ID: 8645032

UNIX may be returning data in a different character set  :-X
As for txtIncoming, when you hit enter, it displays what you typed before displayign what the server returned.

Good luck :)

 

by: twistedcodePosted on 2003-06-03 at 22:11:15ID: 8645233

oic.. tnx for the help, i'm still looking forward to making this work.
as for txtincoming, nothing appears after what i typed was displayed.

tnx =)

still need help on this program..=/

 

by: twistedcodePosted on 2003-06-03 at 23:25:25ID: 8645513

hey RavenOfThought =) was able to find the solution to my prob, but i'm giving you the points for helping me get started!
tnx again!

 

by: rdmjrbPosted on 2003-08-05 at 15:23:07ID: 9084409

hey twistedcode what was your solution? as im heading down the same road...

thanks - i'll post a question with some points if needed

 

by: PLavellePosted on 2003-09-23 at 20:05:22ID: 9417825

twistedcode, can you please post what the solution to this problem was?

 

by: rdmjrbPosted on 2003-09-24 at 08:19:30ID: 9421442

PLavelle - fyi - here is what i found:

1. this tool can do alot of the work for you...http://www.symantec.com/region/sg/product/procommplus/
example: run a script against the target machine and save output to text file

2. this is my tool of choice because it allows for greater control...but you have to program it -  http://www.dart.com/powertcp/
example: start an emulation session and grab the output into variables for parsing, saving etc.

hope it helps.

 

by: PLavellePosted on 2003-09-24 at 09:26:36ID: 9422062

Thanks rdmjrb

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