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

doc/net.example.Linux.in

@@ -414,7 +414,7 @@
 # dhclient: emerge net-misc/dhcp
 # dhcpcd:   emerge net-misc/dhcpcd
 # pump:     emerge net-misc/pump
-# udhcpc:   emerge net-misc/udhcp
+# udhcpc:   emerge sys-apps/busybox
 
 # If you have more than one DHCP client installed, you need to specify which
 # one to use - otherwise we default to dhcpcd if available.

net/udhcpc.sh

@@ -3,14 +3,13 @@
 
 udhcpc_depend()
 {
-	program start /sbin/udhcpc
+	program start /bin/busybox
 	after interface
 	provide dhcp
 }
 
 _config_vars="$_config_vars dhcp udhcpc"
 
-# WARNING:- The relies heavily on Gentoo patches and scripts for udhcpc
 udhcpc_start()
 {
 	local args= opt= opts= pidfile="/var/run/udhcpc-${IFACE}.pid"
@@ -22,17 +21,22 @@ udhcpc_start()
 	eval opts=\$dhcp_${IFVAR}
 	[ -z "${opts}" ] && opts=${dhcp}
 
+	# This omits the Gentoo specific patch to busybox,
+	# but it creates temporary files.
+	# We can move this stuff to udhcpc hook script to avoid that, should we do?
+	local conf="/var/run/udhcpc-${IFACE}.conf"
+	echo -n >"$conf"
 	# Map some generic options to dhcpcd
 	for opt in ${opts}; do
 		case "${opt}" in
-			nodns) args="${args} --env PEER_DNS=no";;
+			nodns) echo "PEER_DNS=no" >>"$conf" ;;
-			nontp) args="${args} --env PEER_NTP=no";;
+			nontp) echo "PEER_NTP=no" >>"$conf" ;;
-			nogateway) args="${args} --env PEER_ROUTERS=no";;
+			nogateway) echo "PEER_ROUTERS=no" >>"$conf" ;;
 			nosendhost) sendhost=false;
 		esac
 	done
 
-	[ "${metric:-0}" != "0" ] && args="${args} --env IF_METRIC=${metric}"
+	[ "${metric:-0}" != "0" ] && echo "IF_METRIC=${metric}" >>"$conf"
 
 	ebegin "Running udhcpc"
 
@@ -51,9 +55,9 @@ udhcpc_start()
 	fi
 
 	case " ${args} " in
-		*" --quit "*|*" -q "*) x="/sbin/udhcpc";;
+		*" --quit "*|*" -q "*) x="/bin/busybox udhcpc";;
-		*) x="start-stop-daemon --start --exec /sbin/udhcpc \
+		*) x="start-stop-daemon --start --exec /bin/busybox \
-			--pidfile \"${pidfile}\" --";;
+			--pidfile \"${pidfile}\" -- udhcpc";;
 	esac
 
 	case " ${args} " in
@@ -68,11 +72,8 @@ udhcpc_start()
 			;;
 	esac
 
-	local script="${RC_LIBEXECDIR}"/sh/udhcpc.h
-	[ -x "${script}" ] || script=/lib/rcscripts/sh/udhcpc.sh
-
 	eval "${x}" "${args}" --interface="${IFACE}" --now \
-		--script="${script}" \
+		--script="${RC_LIBEXECDIR}/sh/udhcpc-hook.sh" \
 		--pidfile="${pidfile}" >/dev/null
 	eend $? || return 1
 
@@ -92,14 +93,18 @@ udhcpc_stop()
 	ebegin "Stopping udhcpc on ${IFACE}"
 	case " ${opts} " in
 		*" release "*)
-			start-stop-daemon --stop --quiet --oknodo --signal USR2 \
+			start-stop-daemon --stop --quiet --signal USR2 \
-				--exec /sbin/udhcpc --pidfile "${pidfile}"
+				--exec /bin/busybox --pidfile "${pidfile}"
 			if [ -f /var/cache/udhcpc-"${IFACE}".lease ]; then
 				rm -f /var/cache/udhcpc-"${IFACE}".lease
 			fi
 			;;
 	esac
 
-	start-stop-daemon --stop --exec /sbin/udhcpc --pidfile "${pidfile}"
+	start-stop-daemon --stop --exec /bin/busybox --pidfile "${pidfile}"
 	eend $?
+
+	if [ -e "/var/run/udhcpc-${IFACE}.conf" ]; then
+		rm -f "/var/run/udhcpc-${IFACE}.conf"
+	fi
 }

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
+SRCS+=		init.sh.in init-early.sh.in udhcpc-hook.sh.in
-BIN+=		init-early.sh
+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