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Recipe 3.4 Enabling/Disabling a Service (inetd)
3.4.1 Problem
You want to prevent a specific TCP service from being invoked on your
system by
inetd
.
3.4.2 Solution
To disable, comment out the service's line in
/etc/inetd.conf by preceding it with a hash mark
(#). For example, for the Telnet daemon:
/etc/inetd.conf:
# telnet stream tcp nowait root /usr/sbin/in.telnetd in.telnetd
Then inform inetd by signal to pick up your
changes. (Here the hash mark is the root shell prompt, not a comment
symbol.)
# kill -HUP `pidof inetd`
To enable, uncomment the same line and send
SIGHUP again.
3.4.3 Discussion
Instead of disabling the service, you could delete the line in the
inetd configuration file, or even delete its
executable from the machine, but such deletions are harder to undo.
(Don't remove the executable
and leave the service enabled, or
inetd will still try to run it, and will
complain.) Alternatively, use
ipchains
or
iptables [Recipe 2.6] to keep the
service runnable, just not by remote request.
3.4.4 See Also
inetd(8), inetd.conf(5).
