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snooper - serial line snooping tool
Jun-ichiro itojun Itoh <itojun@mt.cs.keio.ac.jp>
$Id: README,v 1.2 1998/08/13 09:17:25 itojun Exp $
What's this?
The tool is for snooping communication between two devices
that communicate with RS232C serial line.
Machine configuration
There are 3 machines/modems to take part in the configuration.
We will denote those machines as follows:
partyA a computer
partyB computer/modem/digi-cam/whatever
console The computer you are using to snoop
the communication between A and B.
Say, you would like to snoop the following configuration.
partyA ---cableAB--- partyB
In that case you should connect "console" between partyA and
cableAB, as follows:
partyA ---cableX--- console ---cableAB--- party B
cableX must be cross-cable (a cable to connect two computers).
Configuration of software
% cd build
% ./configure
% make depend
% make
% make install
Command-line options
% snooper [-options] dev0 dev1
-bBAUD specifies baud rate.
-u don't use uucp locking (questionable option)
dev0 name of serial device 0.
dev1 name of serial device 1.
Keyboard command
snooper has a set of commands, that acts similar to that of vi.
Note that the characters transmitted into serial port will not be
forwarded, in command parameter input mode. You should set-up log
file and so forth, while the serial line has no activity.
L Switch textual log file.
You'll asked to answer the filename of the log file.
You should use file system on memory (say /tmp in some
configuration), or fast disk, so that no characters were lost.
B Switch binary log file.
You'll asked to answer which line to log, and the filename
of the log file.
Please note that the binary log will be based on "input"
seen from the console. Therefore, If you would like to make
a log of input of line 0 (thus the output from device
connected to line 0), you shold specify line 0.
You should use file system on memory (say /tmp in some
configuration), or fast disk, so that no characters were lost.
m add memo line to the log file.
memo line contains date string, and arbitrary string you've
given.
Q Quit.
c Reset the counter.
b Change baudrate.
C Make console to act as one of the serial lines.
Tap ESC to go back to command mode.
Tap ^V to quote the next char (so that you can send ESC).
Tap ^X to input char by 2 hex digits. (so that you can send
any control character as you like)
By tapping any other key, that character will be sent to the
line.
^L Repaint the screen.
Todo
- Screen resize-aware
- Tuning
repaint control, timeout value
- Modem control lines
are the line status properly copied?
- Multilingualization
it would be nice if we can see Japanese chars on screen.
- Portability check
termio interface
curses variants
header files
- Line check while in command parameter input
Warranty and redistribution
Absolutely no warranty. Pray before try. Freely redistributable.
Copyright
Copyright(c) 1997 by Jun-ichiro Itoh. All rights reserved.
Contacting the author
send e-mail to: Jun-ichiro itojun Itoh <itojun@mt.cs.keio.ac.jp>
for bug reports, you can use
http://www.itojun.org/cgi-bin/gnats-send-pr
Revision history
97/8/13
portability fixes.
97/2/12
binary log file was added.
97/2/11
memo option was added.
97/2/10
project started
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