UNIX for Dummies Questions & Answers

hi all
can anybdy plz tell me how to make a stealth port scan in unix c.
if i want to send *just* ack/fin etc how do i send?
using libnet or what?

thankx

If I understand you correctly, you'd have to use raw sockets.

My advice would be, don't, for a couple reasons.
Plus, my understanding of the TCP/IP protocol at this level might be incorrect. Maybye you can't use ports at all if all you've got is syn and ack.

p.s. It's spelled "please". You obviously know how to spell it, and I'm pretty sure you've got at least the minimum 104 keys required.

To complete stealth port scan use nmap command. If it is lacking in a system you can download one.

Please have in mind:
1. All the scans are discoverable if IDS (intrusion detection system) is present.
2. On working servers half opened connections may cause severe network latency that may result in money loss
3. You read the consequences as they will be SEVERE.
4. If you scan in really quality environment the only thing you will "discover" is honey pots.

Hope it helps.

thankx for replying.
but i want programming logic!. iwant to know *exactly how* to *code* and send a syn/ack,how to set individuals flags and send them!

i am not upto hacking or sumthing like that. i am making a study project on it and i wanted sum details thats it!
thank u again

start with

man tcp
man ip or man ipv4 or man ip4 (depending on the system)

if you want to see an actual examples get nmap sources (it is GNU) and learn from the real project.

i dont htink i can understand those sourcecode!i ma just a newbie.
all i can say if someone could please tell me the name of the function(s) that builds that kind of packets.a link to some source/site (or better if function names etc.) cud help me a lot!

thank you
ambar

Why are you guys explaining how to do a (pseudo) stealth port scan, anyway?