change udhcpc support to busybox udhcpc

This updates the udhcpc support to use busybox's udhcpc instead of the
stand alone version.

I would like to thank jackieku <kjackie@gmail.com> for assisting with
this update.

X-Gentoo-Bug: 205286
X-Gentoo-Bug-URL: http://bugs.gentoo.org/show_bug.cgi?id=205286

sh/.gitignore

@@ -7,3 +7,4 @@ init.sh
 init-early.sh
 ifwatchd-carrier.sh
 ifwatchd-nocarrier.sh
+udhcpc-hook.sh

sh/Makefile.Linux

@@ -1,5 +1,5 @@
-SRCS+=		init.sh.in init-early.sh.in
-BIN+=		init-early.sh
+SRCS+=		init.sh.in init-early.sh.in udhcpc-hook.sh.in
+BIN+=		init-early.sh udhcpc-hook.sh
 
 .SUFFIXES:	.sh.Linux.in
 .sh.Linux.in.sh:

sh/udhcpc-hook.sh.in

@@ -0,0 +1,117 @@
+#!@SHELL@
+# busybox udhcp setup script
+
+PATH=/bin:/usr/bin:/sbin:/usr/sbin
+
+peer_var()
+{
+	[ -n "$1" ] && [ "$1" != "yes" ]
+}
+
+update_dns()
+{
+	peer_var "${PEER_DNS}" && return
+	[ -z "${domain}" ] && [ -z "${dns}" ] && return
+
+	conf="# Generated by udhcpc for ${interface}\n"
+	[ -n "${domain}" ] && conf="${conf}search ${domain}\n"
+	for i in ${dns} ; do
+		conf="${conf}nameserver ${i}\n"
+	done
+	if [ -x /sbin/resolvconf ] ; then
+		printf "${conf}" | resolvconf -a ${interface}
+	else
+		printf "${conf}" > /etc/resolv.conf
+		chmod 644 /etc/resolv.conf
+	fi
+}
+
+update_ntp()
+{
+	peer_var "${PEER_NTP}" && return
+	[ -z "${ntpsrv}" ] && return
+	
+	conf="# Generated by udhcpc for interface ${interface}\n"
+	conf="${conf}restrict default noquery notrust nomodify\n"
+	conf="${conf}restrict 127.0.0.1\n"
+	for i in ${ntpsrv} ; do
+		conf="${conf}restrict ${i} nomodify notrap noquery\n"
+		conf="${conf}server ${i}\n"
+	done
+	conf="${conf}driftfile /var/lib/ntp/ntp.drift\n"
+	conf="${conf}logfile /var/log/ntp.log\n"
+	printf "${conf}" > /etc/ntp.conf
+	chmod 644 /etc/ntp.conf
+}
+
+update_hostname()
+{
+	peer_var "${PEER_HOSTNAME}" && return
+	[ -z "${hostname}" ] && return
+
+	myhost="$(hostname)"
+	[ -z "${myhost}" ] || [ "${myhost}" = "(none)" ] && hostname "${hostname}"
+}
+
+update_interface()
+{
+	[ -n "${broadcast}" ] && broadcast="broadcast ${broadcast}"
+	[ -n "${subnet}" ] && netmask="netmask ${subnet}"
+	[ -n "${mtu}" ] && mtu="mtu ${mtu}"
+	ifconfig "${interface}" ${ip} ${broadcast} ${netmask} ${mtu}
+}
+
+update_routes()
+{
+	peer_var "${PEER_ROUTERS}" && return
+	
+	if [ -n "${router}" ] ; then
+		metric=
+		[ -n "${IF_METRIC}" ] && metric="metric ${IF_METRIC}"
+		for i in ${router} ; do
+			route add default gw "${i}" ${metric} dev "${interface}"
+		done
+	fi
+}
+
+deconfig()
+{
+	ifconfig "${interface}" 0.0.0.0
+
+	if ! peer_var "${PEER_ROUTERS}" ; then
+		while route del default dev "${interface}" >& /dev/null; do
+			:
+		done
+	fi
+
+	if ! peer_var "${PEER_DNS}" ; then
+		[ -x /sbin/resolvconf ] && resolvconf -d "${interface}"
+	fi
+}
+
+if [ -r "/var/run/udhcpc-${interface}.conf" ]; then
+	. "/var/run/udhcpc-${interface}.conf"
+fi
+
+case "$1" in
+	bound|renew)
+		update_hostname
+		update_interface
+		update_routes
+		update_dns
+		update_ntp
+		;;
+	deconfig|leasefail)
+		deconfig
+		;;
+	nak)
+		echo "nak: ${message}"
+		;;
+	*)
+		echo "unknown option $1" >&2
+		echo "Usage: $0 {bound|deconfig|leasefail|nak|renew}" >&2
+		exit 1
+		;;
+esac
+
+exit 0