[package] wide-dhcpv6: improve user DUID handling

- values containing exactly six octets are treated as type 3 (DUID-LL)
	- values containing seven and more octets get the length tag added in native endianess
	- all other values are treated as invalid


git-svn-id: svn://svn.openwrt.org/openwrt/packages@28079 3c298f89-4303-0410-b956-a3cf2f4a3e73

ipv6/wide-dhcpv6/Makefile

@@ -3,7 +3,7 @@ include $(TOPDIR)/rules.mk
 
 PKG_NAME:=wide-dhcpv6
 PKG_VERSION:=20080615
-PKG_RELEASE:=6
+PKG_RELEASE:=7
 
 PKG_SOURCE:=$(PKG_NAME)-$(PKG_VERSION).tar.gz
 PKG_SOURCE_URL:=@SF/$(PKG_NAME)

ipv6/wide-dhcpv6/files/dhcp6c.init

@@ -1,4 +1,4 @@
-#!/bin/sh /etc/rc.common 
+#!/bin/sh /etc/rc.common
 
 DHCP6C_REQUEST_OPTIONS='domain_name_servers domain_name ntp_servers sip_server_address sip_domain_name nis_server_address nis_domain_name nisp_server_address nisp_domain_name bcmcs_server_address bcmcs_domain_name'
 
@@ -28,10 +28,7 @@ dhcp6c_write_duid() {
 	local pat="[0-9A-F][0-9A-F]"
 
 	case "$mac" in
-		$pat:$pat:$pat:$pat:$pat:$pat:$pat:$pat:$pat:$pat)
-			printf $(echo "$mac" | sed -e 's/^/\\x/; s/:/\\x/g')
-			logger -t dhcp6c "Using user provided DUID $mac"
-		;;
+		# exactly 6 octets -> assume type 3 (DUID-LL - RFC3315, 9.4)
 		$pat:$pat:$pat:$pat:$pat:$pat)
 			local oIFS="$IFS"; IFS=":"; set -- $mac; IFS="$oIFS"
 
@@ -47,6 +44,24 @@ dhcp6c_write_duid() {
 			printf \\x00\\x03\\x00\\x06\\x$1\\x$2\\x$3\\x$4\\x$5\\x$6
 			logger -t dhcp6c "Using MAC address DUID 00:03:00:06:$1:$2:$3:$4:$5:$6"
 		;;
+		# at least 7 octets -> could be type 1 or type 2
+		$pat:$pat:$pat:$pat:$pat:$pat:*)
+			local len_id=":$(echo "$mac" | sed -e 's/[^:]//g')"
+			local len_hi=$(printf "%02x" $((${#len_id} / 0xFF)) )
+			local len_lo=$(printf "%02x" $((${#len_id} % 0xFF)) )
+
+			# low endian
+			if [ "$(printf \\1 | hexdump -n1 -ve '8/2 "%04x"')" = "0001" ]; then
+				printf \\x$len_lo\\x$len_hi
+
+			# big endian
+			else
+				printf \\x$len_hi\\x$len_lo
+			fi
+
+			printf $(echo "$mac" | sed -e 's/^/\\x/; s/:/\\x/g')
+			logger -t dhcp6c "Using user provided DUID $mac"
+		;;
 		*)
 			logger -t dhcp6c "Unable to derive DUID from interface '$client_device' and no valid user DUID given"
 		;;
@@ -58,11 +73,10 @@ dhcp6c_write_interface() {
 	local sla_id
 	local sla_len
 	local enabled
-	
+
 	config_get_bool enabled "$cfg" enabled 0
-	 
+
 	if [ $enabled -ne 0 ]; then
-	
 		config_get sla_id "$cfg" sla_id
 		config_get sla_len "$cfg" sla_len
 
@@ -70,9 +84,7 @@ dhcp6c_write_interface() {
 		printf '\t\tsla-id %s;\n' "$sla_id"
 		printf '\t\tsla-len %s;\n' "$sla_len"
 		printf '\t};\n'
-	
 	fi
-	
 }
 
 dhcp6c_write_request() {
@@ -80,30 +92,29 @@ dhcp6c_write_request() {
 }
 
 dhcp6c_write_config() {
-
 	local pd
 	local na
 	config_get_bool pd basic pd 0
 	config_get_bool na basic na 0
-	
+
 	printf 'interface %s {\n' "$client_ifname"
-	
+
 	if [ $pd -ne 0 ]; then
 		printf '\tsend ia-pd 0;\n'
 	fi
-	
+
 	if [ $na -ne 0 ]; then
 		printf '\tsend ia-na 0;\n'
 	fi
-	
+
 	local rapid_commit
 	config_get_bool rapid_commit basic rapid_commit 0
 	[ $rapid_commit -ne 0 ] && printf '\tsend rapid-commit;\n'
-	
+
 	local script
 	config_get script basic script
 	[ "$script" != "" ] && printf '\tscript "%s";\n' "$script"
-	
+
 	local request
 	local value
 	for request in $DHCP6C_REQUEST_OPTIONS; do
@@ -112,23 +123,22 @@ dhcp6c_write_config() {
 	done
 
 	printf '};\n\n'
-	
+
 	if [ $pd -ne 0 ]; then
 		printf 'id-assoc pd 0 {\n'
 		config_foreach dhcp6c_write_interface interface
 		printf '};\n\n'
 	fi
-	
+
 	if [ $na -ne 0 ]; then
 		printf 'id-assoc na 0 {\n'
 		printf '};\n\n'
 	fi
-	
+
 	return 0
 }
 
 start() {
-
 	[ ! -e /etc/dhcp6cctlkey ] && `dd if=/dev/urandom count=1 2> /dev/null | md5sum | cut -d" " -f1 > /etc/dhcp6cctlkey`
 
 	[ -e /var/run/dhcp6c.pid ] && return 0
@@ -136,7 +146,7 @@ start() {
 	include /lib/network
 
 	config_load "dhcp6c"
-	
+
 	local enabled
 	config_get_bool enabled basic enabled 0
 	[ $enabled -eq 0 ] && return 0
@@ -145,39 +155,36 @@ start() {
 	config_get user_duid basic duid
 
 	logger -t dhcp6c starting dhcp6c
-	
+
 	local client_interface
 	config_get client_interface basic interface
 	local client_ifname=$(get_ifname "$client_interface")
 	local client_device=$(get_device "$client_interface" "$client_ifname")
-	
+
 	local config_file="/var/etc/dhcp6c.conf"
 	local duid_file="/var/dhcp6c_duid"
 	mkdir -m 755 -p /var/etc
 	dhcp6c_write_config > $config_file
 	dhcp6c_write_duid "$user_duid" > $duid_file
-	
+
 	local debug
 	local debug_option
 	config_get_bool debug basic debug 0
 	[ $debug -eq 1 ] && debug_option="-D"
 	/usr/sbin/dhcp6c -c $config_file $debug_option $client_ifname
-	
+
 	sleep 3
 	ACTION=start /sbin/hotplug-call dhcp6c
-	
+
 	return 0
-	
 }
 
 stop() {
-
 	logger -t dhcp6c stopping dhcp6c
 	service_kill dhcp6c /var/run/dhcp6c.pid
 	rm -f /var/etc/dhcp6c.conf /var/run/dhcp6c.pid
 	ACTION=stop /sbin/hotplug-call dhcp6c
 	return 0
-	
 }