custom PKT&TCP RESET,Block page for Winpkfilter wwwcenso

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  • #5223
    pratap
    Participant

      I am trying winpkfilter WWWcensor sample… to Block that Web Page as soon keyword encountered.

      I am able to modify the content of keyword in the page i.e S*X —-> some XXX
      It is reflecting in the page, all the blocked words are replaced with given keywords.

      What I wanted to try now is give Blocked message Page to the Browser .

      To do this..,

      I need to construct a custom packet with source and destination from original packet and send that packet to upper stack i.e MSTCP

      and send a TCP RESET to the site ( get the ip from original packet)
      — OR —- Block subsequent packets from same site.

      Please Help…..[/b]

      #6663
      Vadim Smirnov
      Keymaster

        You can modify the packet directly without making a copy. However, don’t forget to recalculate checksums before reinjecting the modified packet. Also, if you change TCP data length you have to change TCP header SEQ value.

        #6664
        pratap
        Participant

          What I wanted to try now is give Blocked message Page to the Browser .

          To do this..,

          I need to construct a custom packet with source and destination from original packet and send that packet to upper stack i.e MSTCP

          and send a TCP RESET to the site ( get the ip from original packet)
          — OR —- Block subsequent packets from same site.

          Please Help…..

          #6665
          Vadim Smirnov
          Keymaster

            It looks you know what you need to do. What help are you asking for?

            #6666
            pratap
            Participant

              I know what to do , But not how to do

              Especially, I can’t able to construct the packets with block message .

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