When the client exits it may take a short amount of time for the
dhclient hook script to deliver the options to NetworkManager; so
we need to keep the client object around a bit (so we know what
NMDHCPClient the options getting delivered are for). If we don't,
the DHCPManager will dispose of the DHCPClient object and then
when the options come in, it can't match up the PID from the
options with the PID of an existing NMDHCPClient. So put the
clients on a removal timer that keeps them around for a bit before
we let the manager dispose of them.
Since we're keeping the PID around too instead of zeroing it when
the client exits (for the reason above), track whether the client
is really dead yet so we don't indiscriminately kill a random
process that happens to re-use the PID.
Clients in IPv6 info-only mode may exit after getting a response
from the server, since there are no leases involved in info-only
mode. To ensure that the client's options are received when the
event comes in (which could be after we get the child watch
callback for the exit) we still need the client's PID.
If your distributor forgot to set up the client path for you, this
makes NM look in the right places and allows you to use either client
if it's installed, no matter what NM was configured with.
Since the same interface could be used for both DHCPv4 and DHCPv6 we
can't just use 'iface' for tracking DHCP client lease changes. Instead
use a generated client ID, and track DHCP events based on the client's
PID instead of interface name.
0.7 requires dbus 1.1 or greater (for system bus activation), so make that
explicit, and remove compat code for D-Bus 0.6 and earlier. Consolidate
the various glib pkgconfig checks into one, since most anything will require
gthread, glib, and gobject anyway. Fixup the docs makefile to be more
automake-compatible and let 'make clean' actually work correctly when
docs are built.
Based on patches by Johan Bilien <jobi@via.ecp.fr>,
nick loeve <trickie@gmail.com>, and Roy Marples <roy@marples.name>
with significant changes for dhclient formatting and test cases.
Note that dhclient needs help before it can actually parse
classless static routes by adding the following to the
dhclient.conf file:
option rfc3442-classless-static-routes code 121 = array of unsigned integer 8;
