GNU Rush
	Restricted User Shell	Sergey Poznyakoff

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6.7 Notification

In this section we will show how to set up a mail notification for Rush rules. Let’s suppose we wish to receive emails for each upload by scp-to rule (see scp). To do so, we add the following fall through rule to the beginning of rush.rc:

rule default
  post-socket "inet://localhost"
  fall-trough

This will enable notifications for each rule located below this one. Missing port in post-socket statement means rush will be using the default ‘tcpmux’ port.

To receive and process these requests, you will need an inetd capable to handle TCPMUX. We recommend the one from GNU Inetutils package (GNU Inetutils). In /etc/inetd.conf file, we add:

# Enable TCPMUX handling.
tcpmux          stream  tcp  nowait root  internal
# Handle ‘scp-to’ service.
tcpmux/+scp-to  stream  tcp  nowait root  \
                        /usr/sbin/tcpd  /bin/rushmail

The program /bin/rushmail does the actual notification. Following is its simplest implementation:

#! /bin/sh

read user command

/usr/sbin/sendmail -oi -t <<EOT
From: GNU Rush Notification <devnull@localhost>
To: <root@localhost>
Subject: GNU Rush notification

Be informed that $user executed $command.
EOT