hi -- in the wee hours of the night (when one is normally sleeping...) i was tinkering around with a BS2 module (basic stamp 2) and how it can interact with a PC via the serial bus....
Here is my question - is it possible for a shell script / perl script to monitor a filtered data stream from 'tcpdump' -- looking for key pieces of text. when there is a match on say "FTP" or "WWW" or "SSH", the shell script or perl script would output a single byte of data to the serial port: for example: $tcpdump | grep -v stuff_to_filter | some_perl_or_shell_script > /dev/ttyS0 so for every packet with a header that matches SSH --> output a '1' WWW --> output a '2' FTP --> output a '3' .... and so on. the basic stamp would be listening for data on the serial port, in single byte chunks from 1 - 9 (or a - z, or whatever). based on the byte it receives it would set a corresponding I/O pin high, short pause, then low. the I/O pins would be connected to LEDs -- which would yield a crude display what what kind of traffic exists on the network -> by blinking various LEDs. is it possible to search streams of data like this, and would such a search actually provide reliable information? any ideas? thanks, dylan
