Pass DBUS_SYSTEM_BUS_ADDRESS environment variable to dhclient. So that dhclient will, in turn, pass it to the action script (the action script tries to send a DBus signal to NetworkManager over the system bus). Dhclient "execve"s the action script with a hand-constructed environment that only includes specific variables, plus whatever is passed to dhclient with "-e". As far as I know, dhcpcd has no option equivalent to dhclient's "-e". This patch is on the NM_0_8 branch.
Attachment:
0001-Pass-DBUS_SYSTEM_BUS_ADDRESS-environment-variable-to.patch
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