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Packet parsing module in perl

by balakrishnan (Monk)
on Feb 26, 2009 at 16:20 UTC ( #746584=perlquestion: print w/replies, xml ) Need Help??

balakrishnan has asked for the wisdom of the Perl Monks concerning the following question:

Hi Monks,
I need a module which could able to read the packets from the dump file and parse it layer by layer(i.e: ethernet,ip);
it has to provide me the details in ethernet layer(e.g: packets timestamp).
Any ideas greatly appreciated.

Replies are listed 'Best First'.
Re: Packet parsing module in perl
by jettero (Monsignor) on Feb 26, 2009 at 16:26 UTC

    Hopefully for you the Net::Pcap stuff can be made to read the dump files, because if it does it'll do everything you want and more.


Re: Packet parsing module in perl
by zentara (Archbishop) on Feb 26, 2009 at 16:38 UTC
    How about a Packet Parsing Package in Perl? Say it three times fast and you become Larry Wall for a day. :-)

    Oh....and before any of you complain that you said it 3 times fast, and didn't turn into Larry Wall, it's becuase you didn't say it fast enough!

    I'm not really a human, but I play one on earth My Petition to the Great Cosmic Conciousness
Re: Packet parsing module in perl
by zwon (Abbot) on Feb 26, 2009 at 17:58 UTC

    Probably NetPacket is what you need.

    Upd: link fixed

      How do i can extract the packet arrival time from a packet?
        I don't think the actual packets have timestamps -- could be wrong -- but I know the libpcap files do contain them. I think your best bet (as mentioned above) is to use the Net::Pcap library to read the source file and get the timestamps from there. It seems it does have a pcap_open_offline method, which I don't know how to use, that probably reads the file in.

        How to get the actual timestamps from the packets:

        sub process_packet { my($user_data, $header, $packet) = @_; print "time: $header->{tv_sec}\n"; } # The header information is a reference to a hash containing the fol +lowing fields. # # * "len" - the total length of the packet. # * "caplen" - the actual captured length of the packet # * "tv_sec" - seconds value of the packet timestamp. # * "tv_usec" - microseconds value of the packet timestamp.


Re: Packet parsing module in perl
by Anonymous Monk on Feb 26, 2009 at 17:55 UTC
    You have done C programs to do everything related to this already, what is the problem with that C program?. Everything you have already done in C, why do you go for Perl now?.

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