/lib/udev/net.agent is in udev 175-7.2.
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 91 92 93 94 95 96 97 98 99 100 101 102 103 104 | #!/bin/sh -e
#
# run /sbin/{ifup,ifdown} with the --allow=hotplug option.
#
. /lib/udev/hotplug.functions
if [ -z "$INTERFACE" ]; then
mesg "Bad net.agent invocation: \$INTERFACE is not set"
exit 1
fi
check_program() {
[ -x $1 ] && return 0
mesg "ERROR: $1 not found. You need to install the ifupdown package."
mesg "net.agent $ACTION event for $INTERFACE not handled."
exit 1
}
wait_for_interface() {
local interface=$1
while :; do
local state="$(cat /sys/class/net/$interface/operstate 2>/dev/null || true)"
if [ "$state" != down ]; then
return 0
fi
sleep 1
done
}
net_ifup() {
check_program /sbin/ifup
if grep -q '^auto[[:space:]].*\<'"$INTERFACE"'\>' \
/etc/network/interfaces; then
# this $INTERFACE is marked as "auto"
IFUPARG='\('$INTERFACE'\|-a\|--all\)'
else
IFUPARG=$INTERFACE
fi
if ps -C ifup ho args | grep -q "$IFUPARG"; then
debug_mesg "Already ifup-ing interface $INTERFACE"
exit 0
fi
wait_for_interface lo
if [ -e /sys/fs/cgroup/systemd ]; then
exec systemctl start ifup@${INTERFACE}.service
else
exec ifup --allow=hotplug $INTERFACE
fi
}
net_ifdown() {
check_program /sbin/ifdown
if ps -C ifdown ho args | grep -q $INTERFACE; then
debug_mesg "Already ifdown-ing interface $INTERFACE"
exit 0
fi
exec ifdown --allow=hotplug $INTERFACE
}
do_everything() {
case "$ACTION" in
add)
# these interfaces generate hotplug events *after* they are brought up
case $INTERFACE in
ppp*|ippp*|isdn*|plip*|lo|irda*|ipsec*)
exit 0 ;;
esac
net_ifup
;;
remove)
# the pppd persist option may have been used, so it should not be killed
case $INTERFACE in
ppp*)
exit 0 ;;
esac
net_ifdown
;;
*)
debug_mesg "NET $ACTION event not supported"
exit 1
;;
esac
}
# When udev_log="debug" stdout and stderr are pipes connected to udevd.
# They need to be closed or udevd will wait for this process which will
# deadlock with udevsettle until the timeout.
do_everything > /dev/null 2> /dev/null &
exit 0
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