$Id: README.logwtmp,v 1.1 2004/04/28 11:36:07 quozl Exp $
pptpd 1.2.0 logwtmp feature, by James Cameron, 28th April 2004.

The --logwtmp feature uses the standard wtmp feature to track users
who have connections to the server.  It works as follows.

When a connection occurs, pptpd launches pppd with two additional
options.  The first option directs pppd to load the pptpd-logwtmp.so
plugin.  The second option is the IP address of the client.

	"plugin /usr/lib/pptpd/pptpd-logwtmp.so"
	"pptpd-original-ip 10.0.0.1"

The plugin defines the pptpd-original-ip option so that pppd will
accept it.

If the plugin fails to load, pppd will fail in the usual manner.  Such
a failure will usually be related to a missing file in /usr/lib/pptpd.

The plugin asks pppd to notify it when IP comes up or goes down.

When IP comes up, the plugin's ip_up() function executes, calling
logwtmp() to mark the user as logged in.  Once this has happened,
commands like "who" will show the user.  The tty will be set to the
PPP interface name.

When IP goes down, the plugin's ip_down() function executes, removing
the entry from wtmp.  Note that a "kill -9" on the pppd will result in
a user appearing to remain logged in.  Don't use "kill -9", use an
ordinary kill.

If pppd debug mode is enabled, the plugin announces it's version when
loaded, and reports the parameters it is handing over to the logwtmp
call.  See the plugins/pptpd-logwtmp.c source.

--