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12.4 nas.scm

nas.scm is a Guile program that allows one to convert a GNU/Linux box into a NAS. It requires Guile version 1.4 or better and PPP version 2.3.7 or better.

To use it, you will basically need to do the following:

1. Create links:

   ln -s libexec/nas.scm /etc/ppp/ip-up
   ln -s libexec/nas.scm /etc/ppp/ip-down
   

   Here, libexec denotes the location of your libexec directory, where nas.scm is installed. If not overridden at configure time, it defaults to ‘prefix/libexec’. These links assure that ppp will invoke nas.scm when the user’s session starts and ends, thus giving it a possibility to send accounting requests.

2. Configure the file raddb/client.conf.
3. Edit the file raddb/nas.rc. The supplied nas.rc template is tailored to work in most environments. The only variables you may need to change are nas-log-facility, specifying the syslog facility to be used for logging, and pppd-args, keeping the arguments to be given to ppp.
4. Configure your /etc/inittab and getty.

   For example, if you use mgetty, then the inittab entries for dial-up lines will look like:

   d0:345:respawn:/sbin/mgetty ttyS0 vt100
   d1:345:respawn:/sbin/mgetty ttyS1 vt100
   ...
   

   mgetty’s login.config will then contain the following line:

   *       -       -       /usr/local/libexec/nas.scm @
   

   If you use agetty, then the inittab will contain (with the long lines split for readability)

   d0:345:respawn:/sbin/agetty -mt60 \
      -l /usr/local/libexec/nas.scm 38400,19200,9600 \
      ttyS0 vt100
   d1:345:respawn:/sbin/agetty -mt60 \
      -l /usr/local/libexec/nas.scm 38400,19200,9600 \
      ttyS1 vt100
   ...