72 lines
2.6 KiB
Plaintext
72 lines
2.6 KiB
Plaintext
XMONISDN
|
|
|
|
1. Purpose
|
|
|
|
After having installed the ISDN system I felt a bit uneasy since the
|
|
system can initiate connections by itself. In fact, I have seen
|
|
spontaneous connections when Netscape was running.
|
|
|
|
For this reason I wanted a monitor that does not consume too much CPU
|
|
resource and displays the connection status in a concise way. Further,
|
|
I wanted an easy method to control the ISDN connection, which means
|
|
shutting down the ISDN subsystem or starting it up -- by clicking on
|
|
an icon.
|
|
|
|
Using the Xbiff program as a source of inspiration I implemented a tool
|
|
that has the functionality described above.
|
|
|
|
|
|
2. Monitoring the ISDN Subsystem
|
|
|
|
The state of the ISDN subsystem is displayed in a small window showing
|
|
appropriate icons:
|
|
|
|
- the ISDN subsystem is inactive: one solid terminal in the foreground,
|
|
another dashed terminal in the background
|
|
- the ISDN subsystem is active, but there is no network connection over
|
|
the ISDN line: two terminals connected by dashed arrows
|
|
- there is an incoming ISDN network connection or the ISDN system is dialing:
|
|
two terminals connected by solid arrows
|
|
- there is an outgoing ISDN network connection: two terminals connected
|
|
by fat arrows in reverse video.
|
|
|
|
When an outgoing connection is established or when the ISDN subsystem
|
|
hangs up, the program beeps to signal this important state change.
|
|
|
|
|
|
3. Controlling the ISDN Subsystem
|
|
|
|
Pressing button 2 in the window while the ISDN system is inactive
|
|
executes the command "/sbin/isdnnet start &" and pressing button 3
|
|
executes "/sbin/isdnnet stop". Provided /sbin/isdnnet is a
|
|
shell-script that can start and stop the ISDN subsystem and provided
|
|
you are in the dialout group (and the ISDN devices in /dev are also
|
|
in the dialout group) you can startup and stop the ISDN system in
|
|
this way.
|
|
|
|
An alternative is to install xmonisdn as setuid root, but that may
|
|
have serious security problems, so that is strongly discouraged.
|
|
If you insist on using xmonisdn as setuid root, read the manual
|
|
page on info how to do that. You could also install xmonisdn as
|
|
setgid dialout, but that too is not without possible problems.
|
|
|
|
|
|
4. Compilation and Installation
|
|
|
|
After having installed the source directory type
|
|
|
|
xmkmf
|
|
make
|
|
make install.all
|
|
|
|
which compiles and installs all files.
|
|
|
|
Now you only have to setup the shell-script /sbin/isdnnet, which could
|
|
simply be a link to the appropriate initialization script. I wrote a
|
|
new script that includes a call to "sendmail -q" in order to deliver
|
|
all mail that has been queued while the ISDN system was inactive.
|
|
|
|
Bernhard Nebel, December 9, 1996
|
|
|
|
Modified August 3, 1999 by Paul Slootman <paul@isdn4linux.de>
|