Question concerning Sniffing

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Hi,

I realy need your help. I`m leading a project concerning a print server. I also must do accounting stuff, like checking who prints how much pages. 

Therefore, I want to write a program, which is running between the printing server and the client. The situation is similar to a man in the middle, in our case a program in the middle. 

So I want to use the part of ethereal, which is able to capture the packages before all the other applications. I want to know which source parts do I need to fullfil this duty. 

thank you
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