GNU Rush
	Restricted User Shell	Sergey Poznyakoff

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4.4.9 Post-process Notification

Rush can be configured to send a notification over INET or UNIX sockets, after completing user request. It is done using the post-socket statement:

rule: post-socket url

Notify URL about completing the user request. This statement implies forked mode (see Accounting and Forked Mode).

Allowed formats for url are:

inet://hostname[:port]

Connect to remote host hostname using TCP/IP. Hostname is the host name or IP address of the remote machine. Optional port specifies the port number to connect to. It can be either a decimal port number or a service name from /etc/services. If port is absent, ‘tcpmux’ (port 1) is assumed.

unix://filename

local://filename

Connect to a UNIX socket filename.

For example:

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

The GNU Rush notification protocol is based on TCPMUX (RFC 1078).

After establishing connection, rush sends the rule tag followed by a CRLF pair. The rule tag acts as a service name. The remote party replies with a single character indicating positive (‘+’) or negative (‘-’) acknowledgment, optionally followed by a message of explanation, and terminated with a CRLF.

If positive acknowledgment is received, rush sends a single line, consisting of the user name and the executed command line, separated by a single space character. The line is terminated with a CRLF.

After sending this line, rush closes the connection.

The post-process notification feature can be used to schedule execution of some actions after certain rules.

See notification example, for an example of how to use this feature.