Solved

vb.net. Extracting SQL traffic from network sniffing

Posted on 2008-10-30
3
687 Views
Last Modified: 2013-11-08
Hi Experts, I have taken code snippets from books and the internet and plagurised my way into running code that displays TCP network traffic in a windows form. I would like to display only the SQL traffic (layer 5) and pass it to a client via System.Net.Sockets.
Everything works, but I cannot find a way to extract just the SQL from the TCP.

For now I'd like to just display the SQL in the windows list box "lbPackets" -- Any ideas?

The example code that I have used as my base for the TCP sniffing is shown below: (taken from "Network Programming.Net with C# and VB.Net 2004, ISBN: 1-55558-315-6)


Public Sub Run()
        Control.CheckForIllegalCrossThreadCalls = False
        Dim len_receive_buf As Integer = 4096
        Dim len_send_buf As Integer = 4096
        Dim receive_buf() As Byte = New Byte(len_receive_buf) {}
        Dim send_buf() As Byte = New Byte(len_send_buf) {}
        Dim cout_receive_bytes As Integer
        Dim socket As Socket = New Socket(AddressFamily.InterNetwork, SocketType.Raw, ProtocolType.IP)
        socket.Blocking = False
 
        Dim IPHost As IPHostEntry = Dns.GetHostEntry(Dns.GetHostName())
        socket.Bind(New IPEndPoint(IPAddress.Parse(IPHost.AddressList(0).ToString()), 0))
        socket.SetSocketOption(SocketOptionLevel.IP, SocketOptionName.HeaderIncluded, 1)
 
        Dim bIN As Byte() = New Byte() {1, 0, 0, 0}
        Dim bOUT As Byte() = New Byte() {0, 0, 0, 0}
        Dim SIO_RCVALL As Integer = &H98000001
        Dim ret_code As Integer = socket.IOControl(SIO_RCVALL, bIN, bOUT)
 
        Do
            Dim ar As IAsyncResult = socket.BeginReceive(receive_buf, 0, len_receive_buf, SocketFlags.None, Nothing, Me)
            cout_receive_bytes = socket.EndReceive(ar)
            Receive(receive_buf, cout_receive_bytes)
        Loop
 
    End Sub
 
    Public Sub Receive(ByVal buf As Byte(), ByVal len As Integer)
        If buf(9) = 6 Then
            lbPackets.Items.Add(Encoding.ASCII.GetString(buf).Replace(Chr(0), " "))
        End If
    End Sub

Open in new window

0
Comment
Question by:jamesspo
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
  • 2
3 Comments
 
LVL 15

Expert Comment

by:David L. Hansen
ID: 22847931
why do you want to be "sniffing a network"?????
0
 

Author Comment

by:jamesspo
ID: 22848156
I'm not trying to "sniff the network". The sample code that I have attached does that already. I'm asking "How do I extract SQL from the TCP capture"?

If it really matters to you I am trying to collect SQL on-the-fly, to determine performance characteristics and query quality, without using SQL profiling or logging.

Thanks for your interest.

0
 

Accepted Solution

by:
jamesspo earned 0 total points
ID: 22862341
OK - If ound the answer last night thannks to a few hours with Wireshark.

Just look for the TDS data in the TCP packet. Queries are identifed with bytes 0101 and responses 0104.

Easy.... (grrrr)
0

Featured Post

Use Filtering Commands to Process Files in Linux

Learn how to manipulate data with the help of various filtering commands such as `cat`, `fmt`, `pr`, and others in Linux.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Welcome my friends to the second instalment and follow-up to our Minify and Concatenate Your Scripts and Stylesheets (http://www.experts-exchange.com/Programming/Languages/.NET/ASP.NET/A_4334-Minify-and-Concatenate-Your-Scripts-and-Stylesheets.html)…
More often than not, we developers are confronted with a need: a need to make some kind of magic happen via code. Whether it is for a client, for the boss, or for our own personal projects, the need must be satisfied. Most of the time, the Framework…
There are cases when e.g. an IT administrator wants to have full access and view into selected mailboxes on Exchange server, directly from his own email account in Outlook or Outlook Web Access. This proves useful when for example administrator want…
Visualize your data even better in Access queries. Given a date and a value, this lesson shows how to compare that value with the previous value, calculate the difference, and display a circle if the value is the same, an up triangle if it increased…

630 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question