serial port-to-netdevice tap

serial port-to-netdevice tap

[Eble, Dan]

A coworker of mine wants an easy way to monitor data transfer and control
line changes on an serial port.  His first impulse was to create a /proc
file, but I suggested a netlink socket, or even a raw net device so that he
can take advantage of libpcap for some pretty powerful filtering.  Does
anything like this exist already?

-- 
Dan Eble <dane@aiinet.com>  _____  .
Software Engineer          |  _  |/|
Applied Innovation Inc.    | |_| | |
http://www.aiinet.com/     |__/|_|_|

Re: serial port-to-netdevice tap

[Krzysztof Halasa]

"Eble, Dan" <DanE@aiinet.com> writes:

> A coworker of mine wants an easy way to monitor data transfer and control
> line changes on an serial port.  His first impulse was to create a /proc
> file, but I suggested a netlink socket, or even a raw net device so that he
> can take advantage of libpcap for some pretty powerful filtering.  Does
> anything like this exist already?

With character device? I don't think so. One could use a pseudo
terminal combo, though. Another option is to use two additional ports
with their RX lines connected to both TX and RX lines of the main
port. Depends on requirements.
I use a "data acquisition" card with all the async serial protocol
etc. analysis in (quite simple) software.
A "strace" (if you want to see what a process does) could be a help as
well.
-- 
Krzysztof Halasa, B*FH