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Re: Ethernet code

On Wednesday, March 13, 2002, at 03:27 PM, Nick Howes wrote:

This is a bit of a long shot, but here goes: I want to prototype some code for an embedded java project on Mac OS X - I can use J2SE for the prototype, so that's not a problem. However, I need to be able to send and receive ethernet packets, not TCP/IP packets, ethernet packets with a particular protocol number. A while ago, I did a project using JNI on Linux, but I'm guessing this puts me into the driver code, maybe even the kernel - places where I'm not too comfortable! I'm hoping that someone might point me to some example code or have done a similar project and be willing to share their code.

There are a couple of alternatives, none that should force you into the kernel. Probably the easiest is to use BPF (q.v.). You can check the bootp project to find code that reads and writes from one of the bpf devices. In addition, you can get on the bleeding edge and use a PF_NDRV socket. Check the SharedIP module for details on how to use this one.

I wouldn't want to use the BPF approach for real, though, if the protocol you are implementing/supporting uses a fair amount of bandwidth. It tends to put a burden on the system if lots of incoming packets need to be processed.

What protocol are you handling, and what did you do on Linux to support the application?

Regards,

Justin

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 >Ethernet code (From: Nick Howes <email@hidden>)



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