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C Socket Programming

 
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C Socket Programming
Nam3kaTh
18 Dec, 2007 - 09:12 PM
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Hello,

I was wondering if there is a way to develop applications that would be able to work through DHCP on both the host and client? Let me explain, see I want to build a point-to-point application that would not require port forwarding knowledge.

My original idea was to have both parties input the recipients ip address and a desired port and then the sender would begin sending an ACK packet while the receiver would simultaneously be broadcasting a SYN-esk packet and in theory both routing tables would anticipating a packet from their respective hosts, thus allowing a transmission to begin. (Similar to packet spoofing but for legitimate use)

Would this theoretically work or is there a better approach to this?

I'm attempting to write this in C and developing it for Windows XP/Vista.

Any help would be greatly appreciated.

This post has been edited by Nam3kaTh: 18 Dec, 2007 - 09:18 PM
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snoj
RE: C Socket Programming
18 Dec, 2007 - 09:17 PM
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Good idea (I think), but you'd also have to know what (if any) a firewall is doing to the packets in between.

Typically home routers/firewalls these days use PAT (Port Address Translation). This means that a port open on a computer and the port the firewall uses can (and often are) different.
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Nam3kaTh
RE: C Socket Programming
18 Dec, 2007 - 09:23 PM
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QUOTE(snoj @ 18 Dec, 2007 - 10:17 PM) *

Good idea (I think), but you'd also have to know what (if any) a firewall is doing to the packets in between.

Typically home routers/firewalls these days use PAT (Port Address Translation). This means that a port open on a computer and the port the firewall uses can (and often are) different.


Hum, definitely a step in the right direction, perhaps monitoring connections and detecting and relaying changes, that may become tedious to code and more so perfect
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