reading packet headers

This is a discussion on reading packet headers within the Linux Programming forums, part of the Platform Specific Boards category; I have written a simple program that watches a port (using an AF_INET socket) and prints out the contents of ...

  1. #1
    Hamster without a wheel iain's Avatar
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    reading packet headers

    I have written a simple program that watches a port (using an AF_INET socket) and prints out the contents of the TCP packet. The thing is i would also like to read the header information aswell (source IP and port and destination IP and port).

    Do i need to use a different type of socket (ie not AF_INET)?
    Should i be using raw sockets to do this or do i need to work at a lower level, at the moment i am at the application layer so the underlying layers are stripping the data i want.

    Can someone please point in the right dircetion?

    tia

    (writing in C , compiling for Slackware/10 with gcc)
    Monday - what a way to spend a seventh of your life

  2. #2
    Obsessed with C chrismiceli's Avatar
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    I just searched the internet for you, I found that raw sockets may or may not include the headers. I found this explaining some stuff about packets. They recomment an api such as libpcap to capture packets.
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    I've used libpcap before, and it works great. It's extremely easy to use as well.

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