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Re: Re: NetPacket::TCP output

by Benedict (Initiate)
on Oct 06, 2001 at 20:49 UTC ( #117224=note: print w/replies, xml ) Need Help??

in reply to Re: NetPacket::TCP output
in thread NetPacket::TCP output

Ah, I'm fairly familiar with the flags and what they mean, ACK, SYN, RST, etc. My problem is that the output from NetPacket::TCP for the flags does not seem to be in the form, ACK, etc., but is somekind of numerical encoding. For instance, to test what the output was like, I captured one packet and printed out the flags, and what I got was "24". I don't know how to interpret that.


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Re: Re: Re: NetPacket::TCP output
by Benedict (Initiate) on Oct 07, 2001 at 00:08 UTC

    There are six flags. Perhaps 2, for instance, is SYN, and 4 is ACK?


      Nope, that explanation doesn't work. Help?


        I can't take credit for this, I copied from someone elses code.
        sub parse_tcp_flags { my $flagword = shift(@_); my %flags = ("FIN"=>0,"SYN"=>0,"RST"=>0,"PSH"=>0,"ACK"=>0,"URG"=>0) +; $flags{FIN} = ($flagword & 0x01)? 1: 0; $flags{SYN} = ($flagword & 0x02)? 1: 0; $flags{RST} = ($flagword & 0x04)? 1: 0; $flags{PSH} = ($flagword & 0x08)? 1: 0; $flags{ACK} = ($flagword & 0x10)? 1: 0; $flags{URG} = ($flagword & 0x20)? 1: 0; return \%flags; }
        Pass this function the flags from parse_tcp_flags

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