Commits on Oct 3, 2023

1. pppd: implement net-init, net-pre-up and net-down. …

   net-init executes as a blocking script directly after the unit number
   becomes available.  This can be used to initialise aspects related to
   the ppp connection that lives outside of the ppp connection.  It can
   also be used to clean up (in the author's extremely unlikely case) where
   a previous pppd crashed, and net-down didn't execute in order to clean
   up.
   
   net-pre-up executes as a blocking script after auth, prior to NCPs being
   negotiated.  Unlike ip-pre-up this is guaranteed to execute prior to the
   interface being brought up, and can be used in an NCP agnostic manner to
   pre-initialise aspects of the interface for which it still needs to be
   down (amongst others it's recommended that firewall changes happen
   here).
   
   net-down executes in a non-blocking manner just prior to pppd
   terminating and can be used to clean up actions from previous scripts.
   
   You will notice that I mention ip-pre-up doesn't gaurantee that the
   interface will still be down, this is because in a Linux world all
   protocols runs on the same interface, compared to solaris where I'm
   informed each protocol runs on it's own sub-interface, each of which has
   it's own operational state.  The man page for pppd has also been
   adjusted to indicate as much.
   
   Signed-off-by: Jaco Kroon <[email protected]>

   

   jkroonza committed Oct 3, 2023
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