script/_dhcpv6_pd - platform/external/ot-br-posix - Git at Google

 #!/bin/sh
 #
 #  Copyright (c) 2017, The OpenThread Authors.
 #  All rights reserved.
 #
 #  Redistribution and use in source and binary forms, with or without
 #  modification, are permitted provided that the following conditions are met:
 #  1. Redistributions of source code must retain the above copyright
 #     notice, this list of conditions and the following disclaimer.
 #  2. Redistributions in binary form must reproduce the above copyright
 #     notice, this list of conditions and the following disclaimer in the
 #     documentation and/or other materials provided with the distribution.
 #  3. Neither the name of the copyright holder nor the
 #     names of its contributors may be used to endorse or promote products
 #     derived from this software without specific prior written permission.
 #
 #  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 #  AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 #  IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 #  ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
 #  LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 #  CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 #  SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 #  INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 #  CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 #  ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 #  POSSIBILITY OF SUCH DAMAGE.
 #
 #   Description:
 #       This script manipulates DHCPv6-PD configuration.
 #
 #
 # Currently solution was verified only on raspbian.
 #

 if [ $PLATFORM = "ubuntu" ]; then
     WAN_INTERFACE="enp0s3"
 else
     WAN_INTERFACE="eth0"
 fi

 WLAN_INTERFACE="wlan0"

 WPANTUND_INTERFACE="wpan0"
 WPANTUND_ENV="/etc/default/wpantund"

 DHCPCD_CONF="/etc/dhcpcd.conf"
 DHCPCD_CONF_BACKUP="$DHCPCD_CONF.orig"

 NCP_STATE_NOTIFIER="/usr/sbin/ncp_state_notifier"
 NCP_STATE_DISPATCHER="/etc/ncp_state_notifier/dispatcher.d"

 NCP_STATE_NOTIFIER_SERVICE_NAME="ncp_state_notifier.service"
 NCP_STATE_NOTIFIER_SERVICE="/etc/systemd/system/${NCP_STATE_NOTIFIER_SERVICE_NAME}"

 DHCPCD_RELOADER="${NCP_STATE_DISPATCHER}/dhcpcd_reloader"

 without DHCPV6_PD || test $PLATFORM = raspbian || test $PLATFORM = ubuntu || die "DHCPv6-PD is not tested under $PLATFORM."

 create_dhcpcd_conf_with_dhcpv6_pd()
 {
     sudo tee ${DHCPCD_CONF} << EOF
 # A sample configuration for dhcpcd.
 # See dhcpcd.conf(5) for details.

 # Allow users of this group to interact with dhcpcd via the control socket.
 #controlgroup wheel

 # Inform the DHCP server of our hostname for DDNS.
 hostname

 # Use the hardware address of the interface for the Client ID.
 #clientid
 # or
 # Use the same DUID + IAID as set in DHCPv6 for DHCPv4 ClientID as per RFC4361.
 duid

 # Rapid commit support.
 # Safe to enable by default because it requires the equivalent option set
 # on the server to actually work.
 option rapid_commit

 # A list of options to request from the DHCP server.
 option domain_name_servers, domain_name, domain_search, host_name
 option classless_static_routes
 # Most distributions have NTP support.
 option ntp_servers
 # Respect the network MTU.
 # Some interface drivers reset when changing the MTU so disabled by default.
 #option interface_mtu

 # A ServerID is required by RFC2131.
 require dhcp_server_identifier

 # Generate Stable Private IPv6 Addresses instead of hardware based ones
 slaac hwaddr

 # A hook script is provided to lookup the hostname if not set by the DHCP
 # server, but it should not be run by default.
 nohook lookup-hostname
 nohook wpa_supplicant

 denyinterfaces nat*

 noipv6rs

 interface $WPANTUND_INTERFACE
 nodhcp
 nodhcp6

 interface $WAN_INTERFACE
 iaid 1
 ipv6rs
 ia_na 2
 ia_pd 3/::/63 $WPANTUND_INTERFACE/1

 EOF

 if [ $PLATFORM = "raspbian" ]; then
     sudo tee -a ${DHCPCD_CONF} << EOF
 interface $WLAN_INTERFACE
 iaid 4
 ipv6rs
 ia_na 5
 ia_pd 6/::/63 $WPANTUND_INTERFACE/1
 EOF
 fi
 }

 create_ncp_state_notifier_script()
 {
     sudo tee ${NCP_STATE_NOTIFIER} << EOF
 #!/bin/sh
 #
 #  Copyright (c) 2017, The OpenThread Authors.
 #  All rights reserved.
 #
 #  Redistribution and use in source and binary forms, with or without
 #  modification, are permitted provided that the following conditions are met:
 #  1. Redistributions of source code must retain the above copyright
 #     notice, this list of conditions and the following disclaimer.
 #  2. Redistributions in binary form must reproduce the above copyright
 #     notice, this list of conditions and the following disclaimer in the
 #     documentation and/or other materials provided with the distribution.
 #  3. Neither the name of the copyright holder nor the
 #     names of its contributors may be used to endorse or promote products
 #     derived from this software without specific prior written permission.
 #
 #  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 #  AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 #  IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 #  ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
 #  LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 #  CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 #  SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 #  INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 #  CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 #  ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 #  POSSIBILITY OF SUCH DAMAGE.
 #
 #   Description:
 #       This script notifies about NCP state changes.
 #

 PID=\$\$
 NAME="ncp_state_notifier"

 DISPATCHER_PATH="${NCP_STATE_DISPATCHER}"

 echo \${PID} > "/tmp/\${NAME}.pid"

 if [ -z \${IFACE} ]; then
     IFACE=${WPANTUND_INTERFACE}
 fi

 WPANTUND_IFACE="com.nestlabs.WPANTunnelDriver"
 WPANTUND_NCP_STATE_PATH="/com/nestlabs/WPANTunnelDriver/\${IFACE}/Properties/NCP/State"

 WATCH1="type='signal', interface=\${WPANTUND_IFACE}, path=\${WPANTUND_NCP_STATE_PATH}, member='PropertyChanged'"

 notify_about_state()
 {
     logger -t "\${NAME}[\${PID}]" "Notifying about change state to: \${1} on the interface: \${2}"

     for SCRIPT in \`find \${DISPATCHER_PATH} -type f\`; do
         logger -t "\${NAME}[\${PID}]" "Running script: \${SCRIPT}"
         .\${SCRIPT} \${1} \${2}
     done
 }

 process_output()
 {
     local NEXT_LINE_IS_STATE=0

     while read -r LINE; do
         if echo \${LINE} | grep -q "NCP:State"; then
             NEXT_LINE_IS_STATE=1
             continue
         fi

         if [ \${NEXT_LINE_IS_STATE} -eq 1 ]; then
             NEXT_LINE_IS_STATE=1

             STATE=\`echo \${LINE} | cut -d'"' -f2\`
             notify_about_state \${STATE} \${IFACE}
         fi
     done
 }

 dbus-monitor --system "\${WATCH1}" | process_output
 EOF
 }

 create_dhcpcd_reloader_script()
 {
     sudo tee ${DHCPCD_RELOADER} << EOF
 #!/bin/sh
 #
 #  Copyright (c) 2017, The OpenThread Authors.
 #  All rights reserved.
 #
 #  Redistribution and use in source and binary forms, with or without
 #  modification, are permitted provided that the following conditions are met:
 #  1. Redistributions of source code must retain the above copyright
 #     notice, this list of conditions and the following disclaimer.
 #  2. Redistributions in binary form must reproduce the above copyright
 #     notice, this list of conditions and the following disclaimer in the
 #     documentation and/or other materials provided with the distribution.
 #  3. Neither the name of the copyright holder nor the
 #     names of its contributors may be used to endorse or promote products
 #     derived from this software without specific prior written permission.
 #
 #  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 #  AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 #  IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 #  ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
 #  LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 #  CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 #  SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 #  INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 #  CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 #  ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 #  POSSIBILITY OF SUCH DAMAGE.
 #
 #   Description:
 #       This script reloads dhcpcd.
 #

 PID=\$\$
 NAME="dhcpcd_reloader"

 DHCPCD_INTERFACES="/tmp/dhcpcd_interfaces"

 STATE=\$1

 if [ \${STATE} = "associated" ]; then
     if systemctl is-active NetworkManager; then
         logger -t "\${NAME}[\${PID}]" "NetworkManager: active"

         if ! [ -f \${DHCPCD_INTERFACES} ]; then
             exit 1
         fi

         for interface in \`cat \${DHCPCD_INTERFACES}\`; do
             logger -t "\${NAME}[\${PID}]" "dhcpcd: rebind on the interface: \${interface}"
             /sbin/dhcpcd -6 -n \${interface}
         done
     fi

     if systemctl is-active dhcpcd; then
         logger -t "\${NAME}[\${PID}]" "dhcpcd: reload"

         sudo systemctl reload-daemon
         sudo systemctl force-reload dhcpcd
     fi
 fi
 EOF
 }

 create_ncp_state_notifier_service()
 {
     sudo tee ${NCP_STATE_NOTIFIER_SERVICE} << EOF
 [Unit]
 Description=Daemon call scripts on every NCP state change
 After=wpantund.service
 ConditionPathExists=${NCP_STATE_NOTIFIER}

 [Service]
 ExecStart=/bin/sh ${NCP_STATE_NOTIFIER}
 PIDFile=/tmp/ncp_state_notifier.pid
 KillMode=control-group

 [Install]
 WantedBy=multi-user.target
 EOF
 }

 create_wpantund_env_file()
 {
     echo "WPANTUND_OPTS=-o Daemon:SetDefaultRouteForAutoAddedPrefix true -o IPv6:SetSLAACForAutoAddedPrefix true" | sudo tee $WPANTUND_ENV
 }

 dhcpv6_pd_install()
 {
     with DHCPV6_PD || return 0

     # Create backup of the default configuration of dhcpcd
     sudo mv ${DHCPCD_CONF} ${DHCPCD_CONF_BACKUP}

     create_dhcpcd_conf_with_dhcpv6_pd

     create_ncp_state_notifier_script
     sudo chmod +x ${NCP_STATE_NOTIFIER}

     sudo mkdir -p ${NCP_STATE_DISPATCHER}

     create_dhcpcd_reloader_script
     sudo chmod +x ${DHCPCD_RELOADER}

     create_wpantund_env_file

     if have systemctl; then
         create_ncp_state_notifier_service

         sudo systemctl daemon-reload

         if systemctl is-active NetworkManager; then
             sudo systemctl restart NetworkManager || die "Unable to restart NetworkManager!"
         fi

         if systemctl is-active dhcpcd; then
             sudo systemctl restart dhcpcd || die 'Unable to restart dhcpcd!'
         fi

         sudo systemctl start ${NCP_STATE_NOTIFIER_SERVICE_NAME} || die "Unable to start ${NCP_STATE_NOTIFIER_SERVICE_NAME}!"
         sudo systemctl enable ${NCP_STATE_NOTIFIER_SERVICE_NAME} || die "Unable to enable ${NCP_STATE_NOTIFIER_SERVICE_NAME}!"
     fi
 }

 dhcpv6_pd_uninstall()
 {
     with DHCPV6_PD || return 0

     if have systemctl; then
         sudo systemctl disable ${NCP_STATE_NOTIFIER_SERVICE_NAME} || true
         sudo systemctl stop ${NCP_STATE_NOTIFIER_SERVICE_NAME} || true

         sudo rm ${NCP_STATE_NOTIFIER_SERVICE} || true
     fi

     sudo rm ${NCP_STATE_NOTIFIER} || true
     sudo rm ${DHCPCD_RELOADER} || true
     sudo rm ${WPANTUND_ENV} || true

     sudo rm -r ${NCP_STATE_DISPATCHER} || true

     # Restore backup of the default configuration of dhcpcd
     sudo mv ${DHCPCD_CONF_BACKUP} ${DHCPCD_CONF} || true

     # Restart dhcpcd or NetworkManager
     if have systemctl; then
         sudo systemctl daemon-reload

         if systemctl is-active NetworkManager; then
             sudo systemctl restart NetworkManager || true
         fi

         if systemctl is-active dhcpcd; then
             sudo systemctl restart dhcpcd || true
         fi
     fi
 }
	#!/bin/sh
	#
	# Copyright (c) 2017, The OpenThread Authors.
	# All rights reserved.
	#
	# Redistribution and use in source and binary forms, with or without
	# modification, are permitted provided that the following conditions are met:
	# 1. Redistributions of source code must retain the above copyright
	# notice, this list of conditions and the following disclaimer.
	# 2. Redistributions in binary form must reproduce the above copyright
	# notice, this list of conditions and the following disclaimer in the
	# documentation and/or other materials provided with the distribution.
	# 3. Neither the name of the copyright holder nor the
	# names of its contributors may be used to endorse or promote products
	# derived from this software without specific prior written permission.
	#
	# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
	# AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
	# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
	# ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
	# LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
	# CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
	# SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
	# INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
	# CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
	# ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
	# POSSIBILITY OF SUCH DAMAGE.
	#
	# Description:
	# This script manipulates DHCPv6-PD configuration.
	#
	#
	# Currently solution was verified only on raspbian.
	#

	if [ $PLATFORM = "ubuntu" ]; then
	WAN_INTERFACE="enp0s3"
	else
	WAN_INTERFACE="eth0"
	fi

	WLAN_INTERFACE="wlan0"

	WPANTUND_INTERFACE="wpan0"
	WPANTUND_ENV="/etc/default/wpantund"

	DHCPCD_CONF="/etc/dhcpcd.conf"
	DHCPCD_CONF_BACKUP="$DHCPCD_CONF.orig"

	NCP_STATE_NOTIFIER="/usr/sbin/ncp_state_notifier"
	NCP_STATE_DISPATCHER="/etc/ncp_state_notifier/dispatcher.d"

	NCP_STATE_NOTIFIER_SERVICE_NAME="ncp_state_notifier.service"
	NCP_STATE_NOTIFIER_SERVICE="/etc/systemd/system/${NCP_STATE_NOTIFIER_SERVICE_NAME}"

	DHCPCD_RELOADER="${NCP_STATE_DISPATCHER}/dhcpcd_reloader"

	without DHCPV6_PD \|\| test $PLATFORM = raspbian \|\| test $PLATFORM = ubuntu \|\| die "DHCPv6-PD is not tested under $PLATFORM."

	create_dhcpcd_conf_with_dhcpv6_pd()
	{
	sudo tee ${DHCPCD_CONF} << EOF
	# A sample configuration for dhcpcd.
	# See dhcpcd.conf(5) for details.

	# Allow users of this group to interact with dhcpcd via the control socket.
	#controlgroup wheel

	# Inform the DHCP server of our hostname for DDNS.
	hostname

	# Use the hardware address of the interface for the Client ID.
	#clientid
	# or
	# Use the same DUID + IAID as set in DHCPv6 for DHCPv4 ClientID as per RFC4361.
	duid

	# Rapid commit support.
	# Safe to enable by default because it requires the equivalent option set
	# on the server to actually work.
	option rapid_commit

	# A list of options to request from the DHCP server.
	option domain_name_servers, domain_name, domain_search, host_name
	option classless_static_routes
	# Most distributions have NTP support.
	option ntp_servers
	# Respect the network MTU.
	# Some interface drivers reset when changing the MTU so disabled by default.
	#option interface_mtu

	# A ServerID is required by RFC2131.
	require dhcp_server_identifier

	# Generate Stable Private IPv6 Addresses instead of hardware based ones
	slaac hwaddr

	# A hook script is provided to lookup the hostname if not set by the DHCP
	# server, but it should not be run by default.
	nohook lookup-hostname
	nohook wpa_supplicant

	denyinterfaces nat*

	noipv6rs

	interface $WPANTUND_INTERFACE
	nodhcp
	nodhcp6

	interface $WAN_INTERFACE
	iaid 1
	ipv6rs
	ia_na 2
	ia_pd 3/::/63 $WPANTUND_INTERFACE/1

	EOF

	if [ $PLATFORM = "raspbian" ]; then
	sudo tee -a ${DHCPCD_CONF} << EOF
	interface $WLAN_INTERFACE
	iaid 4
	ipv6rs
	ia_na 5
	ia_pd 6/::/63 $WPANTUND_INTERFACE/1
	EOF
	fi
	}

	create_ncp_state_notifier_script()
	{
	sudo tee ${NCP_STATE_NOTIFIER} << EOF
	#!/bin/sh
	#
	# Copyright (c) 2017, The OpenThread Authors.
	# All rights reserved.
	#
	# Redistribution and use in source and binary forms, with or without
	# modification, are permitted provided that the following conditions are met:
	# 1. Redistributions of source code must retain the above copyright
	# notice, this list of conditions and the following disclaimer.
	# 2. Redistributions in binary form must reproduce the above copyright
	# notice, this list of conditions and the following disclaimer in the
	# documentation and/or other materials provided with the distribution.
	# 3. Neither the name of the copyright holder nor the
	# names of its contributors may be used to endorse or promote products
	# derived from this software without specific prior written permission.
	#
	# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
	# AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
	# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
	# ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
	# LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
	# CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
	# SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
	# INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
	# CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
	# ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
	# POSSIBILITY OF SUCH DAMAGE.
	#
	# Description:
	# This script notifies about NCP state changes.
	#

	PID=\$\$
	NAME="ncp_state_notifier"

	DISPATCHER_PATH="${NCP_STATE_DISPATCHER}"

	echo \${PID} > "/tmp/\${NAME}.pid"

	if [ -z \${IFACE} ]; then
	IFACE=${WPANTUND_INTERFACE}
	fi

	WPANTUND_IFACE="com.nestlabs.WPANTunnelDriver"
	WPANTUND_NCP_STATE_PATH="/com/nestlabs/WPANTunnelDriver/\${IFACE}/Properties/NCP/State"

	WATCH1="type='signal', interface=\${WPANTUND_IFACE}, path=\${WPANTUND_NCP_STATE_PATH}, member='PropertyChanged'"

	notify_about_state()
	{
	logger -t "\${NAME}[\${PID}]" "Notifying about change state to: \${1} on the interface: \${2}"

	for SCRIPT in \`find \${DISPATCHER_PATH} -type f\`; do
	logger -t "\${NAME}[\${PID}]" "Running script: \${SCRIPT}"
	.\${SCRIPT} \${1} \${2}
	done
	}

	process_output()
	{
	local NEXT_LINE_IS_STATE=0

	while read -r LINE; do
	if echo \${LINE} \| grep -q "NCP:State"; then
	NEXT_LINE_IS_STATE=1
	continue
	fi

	if [ \${NEXT_LINE_IS_STATE} -eq 1 ]; then
	NEXT_LINE_IS_STATE=1

	STATE=\`echo \${LINE} \| cut -d'"' -f2\`
	notify_about_state \${STATE} \${IFACE}
	fi
	done
	}

	dbus-monitor --system "\${WATCH1}" \| process_output
	EOF
	}

	create_dhcpcd_reloader_script()
	{
	sudo tee ${DHCPCD_RELOADER} << EOF
	#!/bin/sh
	#
	# Copyright (c) 2017, The OpenThread Authors.
	# All rights reserved.
	#
	# Redistribution and use in source and binary forms, with or without
	# modification, are permitted provided that the following conditions are met:
	# 1. Redistributions of source code must retain the above copyright
	# notice, this list of conditions and the following disclaimer.
	# 2. Redistributions in binary form must reproduce the above copyright
	# notice, this list of conditions and the following disclaimer in the
	# documentation and/or other materials provided with the distribution.
	# 3. Neither the name of the copyright holder nor the
	# names of its contributors may be used to endorse or promote products
	# derived from this software without specific prior written permission.
	#
	# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
	# AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
	# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
	# ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
	# LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
	# CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
	# SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
	# INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
	# CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
	# ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
	# POSSIBILITY OF SUCH DAMAGE.
	#
	# Description:
	# This script reloads dhcpcd.
	#

	PID=\$\$
	NAME="dhcpcd_reloader"

	DHCPCD_INTERFACES="/tmp/dhcpcd_interfaces"

	STATE=\$1

	if [ \${STATE} = "associated" ]; then
	if systemctl is-active NetworkManager; then
	logger -t "\${NAME}[\${PID}]" "NetworkManager: active"

	if ! [ -f \${DHCPCD_INTERFACES} ]; then
	exit 1
	fi

	for interface in \`cat \${DHCPCD_INTERFACES}\`; do
	logger -t "\${NAME}[\${PID}]" "dhcpcd: rebind on the interface: \${interface}"
	/sbin/dhcpcd -6 -n \${interface}
	done
	fi

	if systemctl is-active dhcpcd; then
	logger -t "\${NAME}[\${PID}]" "dhcpcd: reload"

	sudo systemctl reload-daemon
	sudo systemctl force-reload dhcpcd
	fi
	fi
	EOF
	}

	create_ncp_state_notifier_service()
	{
	sudo tee ${NCP_STATE_NOTIFIER_SERVICE} << EOF
	[Unit]
	Description=Daemon call scripts on every NCP state change
	After=wpantund.service
	ConditionPathExists=${NCP_STATE_NOTIFIER}

	[Service]
	ExecStart=/bin/sh ${NCP_STATE_NOTIFIER}
	PIDFile=/tmp/ncp_state_notifier.pid
	KillMode=control-group

	[Install]
	WantedBy=multi-user.target
	EOF
	}

	create_wpantund_env_file()
	{
	echo "WPANTUND_OPTS=-o Daemon:SetDefaultRouteForAutoAddedPrefix true -o IPv6:SetSLAACForAutoAddedPrefix true" \| sudo tee $WPANTUND_ENV
	}

	dhcpv6_pd_install()
	{
	with DHCPV6_PD \|\| return 0

	# Create backup of the default configuration of dhcpcd
	sudo mv ${DHCPCD_CONF} ${DHCPCD_CONF_BACKUP}

	create_dhcpcd_conf_with_dhcpv6_pd

	create_ncp_state_notifier_script
	sudo chmod +x ${NCP_STATE_NOTIFIER}

	sudo mkdir -p ${NCP_STATE_DISPATCHER}

	create_dhcpcd_reloader_script
	sudo chmod +x ${DHCPCD_RELOADER}

	create_wpantund_env_file

	if have systemctl; then
	create_ncp_state_notifier_service

	sudo systemctl daemon-reload

	if systemctl is-active NetworkManager; then
	sudo systemctl restart NetworkManager \|\| die "Unable to restart NetworkManager!"
	fi

	if systemctl is-active dhcpcd; then
	sudo systemctl restart dhcpcd \|\| die 'Unable to restart dhcpcd!'
	fi

	sudo systemctl start ${NCP_STATE_NOTIFIER_SERVICE_NAME} \|\| die "Unable to start ${NCP_STATE_NOTIFIER_SERVICE_NAME}!"
	sudo systemctl enable ${NCP_STATE_NOTIFIER_SERVICE_NAME} \|\| die "Unable to enable ${NCP_STATE_NOTIFIER_SERVICE_NAME}!"
	fi
	}

	dhcpv6_pd_uninstall()
	{
	with DHCPV6_PD \|\| return 0

	if have systemctl; then
	sudo systemctl disable ${NCP_STATE_NOTIFIER_SERVICE_NAME} \|\| true
	sudo systemctl stop ${NCP_STATE_NOTIFIER_SERVICE_NAME} \|\| true

	sudo rm ${NCP_STATE_NOTIFIER_SERVICE} \|\| true
	fi

	sudo rm ${NCP_STATE_NOTIFIER} \|\| true
	sudo rm ${DHCPCD_RELOADER} \|\| true
	sudo rm ${WPANTUND_ENV} \|\| true

	sudo rm -r ${NCP_STATE_DISPATCHER} \|\| true

	# Restore backup of the default configuration of dhcpcd
	sudo mv ${DHCPCD_CONF_BACKUP} ${DHCPCD_CONF} \|\| true

	# Restart dhcpcd or NetworkManager
	if have systemctl; then
	sudo systemctl daemon-reload

	if systemctl is-active NetworkManager; then
	sudo systemctl restart NetworkManager \|\| true
	fi

	if systemctl is-active dhcpcd; then
	sudo systemctl restart dhcpcd \|\| true
	fi
	fi
	}