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Example Scripts

156 Chapter 17

User Storage Space

The Digi CM unit comes with 1 megabyte of user storage space. This storage

space can be used to store custom scripts. The location is /usr2. Custom

scripts such as simple commands, are simply dropped into /usr2. If a file

needs to be edited, copy the file into usr2/rc.usr, kill the process, then restart

the process from the new file. Scripts from the user storage may be created to

run during boot after the network is up. The following are some examples of

various ways to create a script stored in the user storage space.

• Saving IP tables options permanently

• Changing radius socket ports

• Limiting root access to the console on Digi CM products

• Sending a break

Example Scripts

Example Script: -Saving IP tables options permanently

Add the following command in the '/usr2/rc.user' script file just above "exit

0". Disabling Telnet is just shown as one example.

1. Create a new script file '/usr2/run.user' that includes the commands you

want.

iptables -A INPUT -p tcp --dport 23 -j DROP

2. Run the following command to make the script executable

chmod 755 /usr2/run.user

3. Add the following command in the '/usr2/rc.user' script, just above "exit 0"

ln -s /usr2/run.user /etc/rc.d/rc2.d/S60runuser

4. Reboot

reboot

Note: If you factory default the unit, the '/usr2/rc.user' script file is moved to '/usr2/

rc.user.old#' and the default rc.user file will be restored.

Example Script: -

Changing radius socket ports

The radius client obtains the radius socket ports to use via the

'/etc/services' file. The client only looks up the lines starting with 'radius'

and 'radacct'.

1. Modify the /etc/services file as follows. Change lines starting with 'radius'

and 'radacct' to the socket numbers you wish. For example:

radius 1645/tcp

radius 1645/ucp

radacct 1646/tcp

radacct 1646/ucp

system.cnf Basic network config information (IP, gateway, etc.)

timezone Time zone configuration

./.usracctl Directory containing user access control information

version Firmware version

File Name Description

1 2 ... 151 152 153 154 155 156 157 158 159 160 161 ... 201 202

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