ifupdown-ng/executor-scripts/dhcp

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#!/bin/sh
set -e
determine_implementation() {
[ -x /sbin/dhcpcd ] && echo "dhcpcd" && return
[ -x /usr/sbin/dhclient ] && echo "dhclient" && return
[ -x /sbin/udhcpc ] && echo "udhcpc" && return
echo "could not find a supported DHCP implementation"
exit 1
}
start() {
case "$1" in
dhcpcd)
[ -z "$IF_HOSTNAME" ] && optargs="$optargs -h $IF_HOSTNAME"
[ -z "$IF_VENDOR" ] && optargs="$optargs -i $IF_VENDOR"
[ -z "$IF_CLIENT" ] && optargs="$optargs -i $IF_CLIENT"
[ -z "$IF_LEASETIME" ] && optargs="$optargs -l $IF_LEASETIME"
/sbin/dhcpcd $optargs $IFACE
dhclient)
/usr/sbin/dhclient -pf /var/run/dhclient.$IFACE.pid $IFACE
;;
udhcpc)
/sbin/udhcpc -b -R -p /var/run/udhcpc.$IFACE.pid -i $IFACE
;;
*)
;;
esac
}
stop() {
case "$1" in
dhcpcd)
/sbin/dhcpcd -k $IFACE
;;
dhclient)
kill -9 $(cat /var/run/dhclient.$IFACE.pid) 2>/dev/null
;;
udhcpc)
kill $(cat /var/run/udhcpc.$IFACE.pid)
;;
*)
;;
esac
}
impl=$(determine_implementation)
[ -z "$VERBOSE" ] || set -x
case "$PHASE" in
up) start $impl ;;
down) stop $impl ;;
*) ;;
esac