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how to analyse the contents of a give IP packet?

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Top Forums UNIX for Advanced & Expert Users how to analyse the contents of a give IP packet?
# 1  
Old 08-01-2008
how to analyse the contents of a give IP packet?
hi you all!
I can write a network program to send and receive some messages. I use
read() and write() functions for extracting of sending messages via a given socket. By doing so, i know only the actions performed at the application layer of the TCP/IP suite. But i want to control the actual contents of each IP packets(i.e data and ip header) sent/received.Lets say I want to write a routing application which analyses the destination address found in the IP header(TCP header) and sends the packet to its destination.
Give me some hint on how to tackle such cases or give me a reference book/site...

thank you
# 2  
Old 08-02-2008
You want to use raw sockets.

Search google for "raw sockets" or "SOCK_RAW" or "PF_PACKET"

If you're programming C in Linux, there are structs that easily let you alter the whole tcp/udp/icmp/igmp/whatever header and inject packets at will. This can also be used for communication over closed ports and other obscure stuff (if you create a listening raw socket, you'll have yourself a "sniffer", and with that you can analyze data packets that arrive even on closed tcp ports)
Last edited by Neo; 08-02-2008 at 07:10 PM.. Reason: Deleted unnecessary editorial comment
# 3  
Old 08-02-2008
libnet: The Million Packet March
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