network programming-packet generation

sonika_singhi · 11-01-2004, 03:19 AM

hello everybody,
i want to create my own packets with network programming in C
language. could anyone pls suggest any ebook or guide from where should i begin. actually i want to add my application header (specifically for DNS)
in the UDP payload and want to know all the structures and functions related to that. pls could anyone help me.
thanx

itzfritz · 11-01-2004, 09:38 AM

Heres a beginning tutorial for 'raw' socket programming in C for linux.
http://mixter.void.ru/rawip.html

Note for your future google searches: use the term "raw sockets".

Here is a raw sockets faq:
http://www.whitefang.com/rin/rawfaq.html

dont know where to point you for your dns question BUT i know that hping lets you do some packet manipulation; found a tut for that here:
http://www.security-forums.com/forum...pic.php?t=6417

happy hacking

mehesque · 11-01-2004, 09:52 AM

I'm going to give you a few suggestions into this dirty, dirty world of network programming.

Read: read the rfc for all the protocols that you want to know about. UDP's rfc number is 768 http://www.faqs.org/rfcs/rfc768.htm.

Learn how to make a packet header or design your own and take it from there.

Debugging isn't too hard if you sniff your packets with ethereal--it has a very intutive interface.

It might be sacrilege but also look at winsocks in addition to just raw sockets, they have some clever libraries.

sonika_singhi · 11-02-2004, 01:15 PM

thanx a lot
this has been really helpful