manually sending packets

I need to get an .exe to send a certain packet to the server it connects to, but I dont have the source code or anything. The server changed the packet info for this command and I have no way to change the client, so I was wondering if there was a program that could maybe hook into this .exe and just force feed the server the packets I need...or maybe change the packets that it sends in the first place? I dont really know...I'm out of my league...I'm about to give up ;/

If you want to change the packets, you need to proxy the packets between it and the server, meaning you'd have to impliment a proxy just for that program.

If the packet didn't change too much, some quick work with a hex editor should be enough.

More information required please.

Get IDA Pro and just fix the program.

>>5

spoken by someone who hasn't even used IDA

>>6
Actually, I've used it quite a lot (although more for old DOS software). True, you need to get familiar with asm to use it, but that's a very useful skill.