Packet Content

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  • May 31, 2006 at 12:38 am #5026
    Mehul
    Participant

      Well, I have understood how to grab the All Header information from the packet,but I require to get the ACTUAL data from the packet.

      How can I do the same ?

      If I change the data and recalculate the chksum; what special care does the code have to take ?

      Please advice

      Thanks

      May 31, 2006 at 3:44 pm #6056
      Vadim Smirnov
      Keymaster

        How can I do the same ?

        Packet data follow the packet header.

        If I change the data and recalculate the chksum; what special care does the code have to take ?

        If you don’t modify packet length then checksums (IP/TCP/UDP) recalculation is enough. If you do modify packet length (an example change “sex” to “fofo”) for TCP protocol you also have to care about Sequence and Acknowledgement numbers.

        May 31, 2006 at 6:36 pm #6057
        Mehul
        Participant

          Could you please provide any snippets of code for the above ?

          June 1, 2006 at 9:30 am #6058
          Vadim Smirnov
          Keymaster

            Not sure what exactly code you need, but this question was already discussed here http://www.ntkernel.com/forum/viewtopic.php?t=19 along with some code postings.

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