device proxy, serial port spy

[monkhandle]

How could I proxy IO data (or even control data) from one to another device transparently?

I need to spy traffic on serial port:

linux application <-> proxy device (writes all IO data to file besides proxying) <-> serial device (/dev/ttyS0)

I searched on inet, found nothing like this. What could be done? To write device driver, that just proxies data to/from target device ? Any easier solution ?

BR

 

[geirendre]

You can check out:
snooper

http://linux.about.com/cs/linux101/g/snooper.htm

jpnevulator

http://jpnevulator.snarl.nl/

ttylog

http://linux.about.com/cs/linux101/g/ttylog.htm

Maby one of them fits your needs.

HTH

 

[monkhandle]

Thanks for answer, but I already tried all those 3, but these do not do what I want. jpnevulator and ttylog are just end applications that read/write from serial port ,they are not really spies. And Snooper is not usable for me, cause I only have one port.

 

[Edcrosbys]

Are you looking for info going BOTH ways to be "copied"? That's difficult, because something would need to play traffic cop. Things could easily get out of wack (pc hearing an "I'm done" type response multiple times, etc).

If you had a rcv only serial devices and wanted to clone info coming from machine to them, you could do that! I would recommend making a special cable where you matched the pins (serial pigtail type).

If you wanted a software way of doing this, you could make a pipe device. Then create a c program (or whatever other language) that reads from the pipe and sends it to multiple serial devices.