Simple nagios monitoring and notification scripts.

`check_ircd` attempts to connect to an IRC server.

`check_senderscore` checks the senderscore (a metric for whether
an IP address tends to send spam email) of an IP address.

`check_onion` attempts to connect to a Tor Onion service via torsocks.

`ircbot.sh` runs as a daemon as the nagios user, connects to the
configured IRC server and channel, keeps the connection open, and
relays messages from nagios to the channel.

## Installing

To install, edit `Makefile` with the appropriate path to your nagios
directory and run `make install` as root. To install the systemd
service, run `make systemd`; for rc service (on OpenBSD), run `make
rc`.

## Setting up `ircbot`

Edit `ircbot` and change the configuration parameters as needed.

Edit your nagios commands configuration (eg
`/usr/local/nagios/etc/commands.cfg`) and define a new host and service
commands that write to the file `/tmp/ircmsg`. For example:

```
    define command {
        command_name    notify-service-by-irc
        command_line    /usr/bin/printf "%b" "$NOTIFICATIONTYPE$ Service: $SERVICEDESC$ Host: $HOSTALIAS$ Address: $HOSTADDRESS$ State: $SERVICESTATE$ Additional Info: $SERVICEOUTPUT$\n" >> /tmp/ircmsg
    }
    define command {
        command_name    notify-host-by-irc
        command_line    /usr/bin/printf "%b" "$NOTIFICATIONTYPE$ Host: $HOSTNAME$ State: $HOSTSTATE$ Address: $HOSTADDRESS$ Info: $HOSTOUTPUT$\n" >> /tmp/ircmsg
    }
```

Then create a contact with parameters:

```
    service_notification_commands   notify-service-by-irc
    host_notification_commands      notify-host-by-irc
```

Check that the new configuration is valid, eg with:

```
     sudo /usr/local/nagios/bin/nagios -v /usr/local/nagios/etc/nagios.cfg
```

And then restart nagios with `systemctl` or `rcctl`.

If you followed the install instructions, a service file was installed for
systemd or rc. Start it with `systemctl start ircbot` or `rcctl start ircbot`.

## Bugs

The nagios IRC bot (ircbot.sh) does not automatically rejoin the
IRC server and channel after it loses the connection.