/lib/udev/ifplugd.agent is in ifplugd 0.28-19ubuntu1.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 | #!/bin/sh
# udev agent script
HOTPLUGFUNCS=/lib/udev/hotplug.functions
[ -f $HOTPLUGFUNCS ] || exit 1
. $HOTPLUGFUNCS
if [ -z "$INTERFACE" ]; then
mesg Bad invocation: \$INTERFACE is not set
exit 1
fi
DAEMON_NAME=ifplugd
DAEMON=/usr/sbin/$DAEMON_NAME
if [ ! -x $DAEMON ]; then
mesg No $DAEMON_NAME executable: $DAEMON
exit 1
fi
CFG=/etc/default/$DAEMON_NAME
if [ -f $CFG ]; then
. $CFG
else
mesg No $DAEMON_NAME configuration file
exit 1
fi
# return true (0) if searchifc ($1) is in argument list ($@)
# return false (1) otherwise
search_interfaces () {
searchifc=$1
shift
for i in $@; do
if [ "$i" = "$searchifc" ] || [ "$i" = "all" ]; then
return 0
fi
done
return 1
}
# wait for networking to be available, taken from net.agent (ifupdown)
wait_for_interface () {
waitifc=$1
while :; do
ifcstate="$(cat /sys/class/net/${waitifc}/operstate 2>/dev/null || true)"
if [ "$ifcstate" != down ]; then
return 0
fi
sleep 1
done
}
ifplugd_daemon () {
search_interfaces "$INTERFACE" $INTERFACES
if [ $? -gt 0 ]; then
# Interface isn't statically managed by ifplugd
search_interfaces "$INTERFACE" $HOTPLUG_INTERFACES
if [ $? -eq 0 ]; then
# Interface is in hotplug allowed list
case "$ACTION" in
add|register)
debug_mesg Invoking $DAEMON_NAME for $INTERFACE
# check for interface specific arguments
IF1=$(echo $INTERFACE | sed "s/-/_/")
A=$(eval echo \$\{ARGS_${IF1}\})
[ -z "$A" ] && A="$ARGS"
# wait for loopback interface to exist, we may have
# been invoked very early in boot sequence
wait_for_interface lo
# spawn ifplugd daemon
exec $DAEMON -i $INTERFACE $A
;;
remove|unregister)
debug_mesg Stopping $DAEMON_NAME for $INTERFACE
# kill a running ifplugd daemon
exec $DAEMON -k -i $INTERFACE
;;
esac
fi
fi
}
ifplugd_daemon &
|