Beefy Boxes and Bandwidth Generously Provided by pair Networks
There's more than one way to do things

Comment on

( #3333=superdoc: print w/replies, xml ) Need Help??
I'm writing a packet sniffer that will allow me to examine the payload(s) of a TCP stream.

Of course, being TCP, there are many different things that can go on during a snoop, so what i'd like to do is find a nice fast way to identify the payload type of a TCP packet.

Specifically i would like to be able to determine if the payload is binary, so i can re-assemble the packets later on for reconstruction.

Idealy I'd like to be able to determine the payload as binary at run time, altho' doing it off line is also an option.

I've been thinking about grabbing the 1st "bunch" of characters, and determining if they're within the printable range, however this method is not fool proof. Doing a more extensive analysis using dipthongs/whitespace/vowels etc i think would be too slow.

I've not written any code (as yet), i'm just looking for suggestions...

In reply to Sniffing binary data, heuristics? by Ryszard

Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post; it's "PerlMonks-approved HTML":

  • Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
  • Titles consisting of a single word are discouraged, and in most cases are disallowed outright.
  • Read Where should I post X? if you're not absolutely sure you're posting in the right place.
  • Please read these before you post! —
  • Posts may use any of the Perl Monks Approved HTML tags:
    a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
  • You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
            For:     Use:
    & &amp;
    < &lt;
    > &gt;
    [ &#91;
    ] &#93;
  • Link using PerlMonks shortcuts! What shortcuts can I use for linking?
  • See Writeup Formatting Tips and other pages linked from there for more info.
  • Log In?

    What's my password?
    Create A New User
    and all is quiet...

    How do I use this? | Other CB clients
    Other Users?
    Others lurking in the Monastery: (2)
    As of 2018-04-20 06:04 GMT
    Find Nodes?
      Voting Booth?