[ipfire-2.x.git] / src / initscripts / helper / aws-setup

#!/bin/bash
###############################################################################
#                                                                             #
# IPFire.org - A linux based firewall                                         #
# Copyright (C) 2007-2022  IPFire Team  <info@ipfire.org>                     #
#                                                                             #
# This program is free software: you can redistribute it and/or modify        #
# it under the terms of the GNU General Public License as published by        #
# the Free Software Foundation, either version 3 of the License, or           #
# (at your option) any later version.                                         #
#                                                                             #
# This program is distributed in the hope that it will be useful,             #
# but WITHOUT ANY WARRANTY; without even the implied warranty of              #
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the               #
# GNU General Public License for more details.                                #
#                                                                             #
# You should have received a copy of the GNU General Public License           #
# along with this program.  If not, see <http://www.gnu.org/licenses/>.       #
#                                                                             #
###############################################################################

. /etc/sysconfig/rc
. ${rc_functions}

# Set PATH to find our own executables
export PATH=/usr/local/sbin:/usr/local/bin:${PATH}

# AWS supports an MTU of up to 9001 bytes
DEFAULT_MTU=9001

get() {
	local file="${1}"

	wget -qO - "http://169.254.169.254/latest/${file}"
}

to_address() {
	local n="${1}"

	local o1=$(( (n & 0xff000000) >> 24 ))
	local o2=$(( (n & 0xff0000) >> 16 ))
	local o3=$(( (n & 0xff00) >> 8 ))
	local o4=$(( (n & 0xff) ))

	printf "%d.%d.%d.%d\n" "${o1}" "${o2}" "${o3}" "${o4}"
}

to_integer() {
	local address="${1}"

	local integer=0

	local i
	for i in ${address//\./ }; do
		integer=$(( (integer << 8) + i ))
	done

	printf "%d\n" "${integer}"
}

prefix2netmask() {
	local prefix=${1}

	local zeros=$(( 32 - prefix ))
	local netmask=0

	local i
	for (( i=0; i<${zeros}; i++ )); do
		netmask=$(( (netmask << 1) ^ 1 ))
	done

	to_address "$(( netmask ^ 0xffffffff ))"
}

import_aws_configuration() {
	local instance_id="$(get meta-data/instance-id)"

	boot_mesg "Importing AWS configuration for instance ${instance_id}..."

	# Store instance ID
	echo "${instance_id}" > /var/run/aws-instance-id

	# Initialise system settings
	local hostname=$(get meta-data/local-hostname)

	# Set hostname
	if ! grep -q "^HOSTNAME=" /var/ipfire/main/settings; then
		echo "HOSTNAME=${hostname%%.*}" >> /var/ipfire/main/settings
	fi

	# Set domainname
	if ! grep -q "^DOMAINNAME=" /var/ipfire/main/settings; then
		echo "DOMAINNAME=${hostname#*.}" >> /var/ipfire/main/settings
	fi

	# Create setup user
	if ! getent passwd setup &>/dev/null; then
		useradd setup -s /usr/bin/run-setup -g nobody -m

		# Unlock the account
		usermod -p "x" setup
	fi

	# Import SSH keys for setup user
	local line
	for line in $(get "meta-data/public-keys/"); do
		local key_no="${line%=*}"

		local key="$(get meta-data/public-keys/${key_no}/openssh-key)"
		if [ -n "${key}" ] && ! grep -q "^${key}$" "/home/setup/.ssh/authorized_keys" 2>/dev/null; then
			mkdir -p "/home/setup/.ssh"
			chmod 700 "/home/setup/.ssh"
			chown setup.nobody "/home/setup/.ssh"

			echo "${key}" >> "/home/setup/.ssh/authorized_keys"
			chmod 600 "/home/setup/.ssh/authorized_keys"
			chown setup.nobody "/home/setup/.ssh/authorized_keys"
		fi
	done

	# Import network configuration
	# After this, no network connectivity will be available from this script due to the
	# renaming of the network interfaces for which they have to be shut down
	local config_type=1
	: > /var/ipfire/ethernet/settings

	local mac
	for mac in $(get meta-data/network/interfaces/macs/); do
		# Remove trailing slash
		mac="${mac//\//}"

		local device_number="$(get "meta-data/network/interfaces/macs/${mac}/device-number")"
		local interface_id="$(get "meta-data/network/interfaces/macs/${mac}/interface-id")"

		# First IPv4 address
		local ipv4_address="$(get "meta-data/network/interfaces/macs/${mac}/local-ipv4s" | head -n1)"
		local ipv4_address_num="$(to_integer "${ipv4_address}")"

		# Get VPC subnet
		local vpc="$(get "meta-data/network/interfaces/macs/${mac}/vpc-ipv4-cidr-block")"
		local vpc_netaddress="${vpc%/*}"
		local vpc_netaddress_num="$(to_integer "${vpc_netaddress}")"

		# Get subnet size
		local subnet="$(get "meta-data/network/interfaces/macs/${mac}/subnet-ipv4-cidr-block")"

		local prefix="${subnet#*/}"
		local netmask="$(prefix2netmask "${prefix}")"

		# Calculate the network and broadcast addresses
		local netaddress="${subnet%/*}"
		local netaddress_num="$(to_integer "${netaddress}")"

		case "${device_number}" in
			# RED
			0)
				local interface_name="red0"

				# The gateway is always the first IP address in the subnet
				local gateway="$(to_address $(( netaddress_num + 1 )))"

				(
					echo "RED_TYPE=STATIC"
					echo "RED_DEV=${interface_name}"
					echo "RED_MACADDR=${mac}"
					echo "RED_DESCRIPTION='${interface_id}'"
					echo "RED_ADDRESS=${ipv4_address}"
					echo "RED_NETMASK=${netmask}"
					echo "RED_NETADDRESS=${netaddress}"
					echo "RED_MTU=1500"
					echo "DEFAULT_GATEWAY=${gateway}"
				) >> /var/ipfire/ethernet/settings

				# Import aliases for RED
				for alias in $(get "meta-data/network/interfaces/macs/${mac}/local-ipv4s" | tail -n +2); do
					echo "${alias},on,"
				done > /var/ipfire/ethernet/aliases
				;;

			# GREEN
			1)
				local interface_name="green0"

				(
					echo "GREEN_DEV=${interface_name}"
					echo "GREEN_MACADDR=${mac}"
					echo "GREEN_DESCRIPTION='${interface_id}'"
					echo "GREEN_ADDRESS=${ipv4_address}"
					echo "GREEN_NETMASK=${netmask}"
					echo "GREEN_NETADDRESS=${netaddress}"
					echo "GREEN_MTU=${DEFAULT_MTU}"
				) >> /var/ipfire/ethernet/settings
				;;

			# ORANGE
			2)
				local interface_name="orange0"
				config_type=2

				(
					echo "ORANGE_DEV=${interface_name}"
					echo "ORANGE_MACADDR=${mac}"
					echo "ORANGE_DESCRIPTION='${interface_id}'"
					echo "ORANGE_ADDRESS=${ipv4_address}"
					echo "ORANGE_NETMASK=${netmask}"
					echo "ORANGE_NETADDRESS=${netaddress}"
					echo "ORANGE_MTU=${DEFAULT_MTU}"
				) >> /var/ipfire/ethernet/settings
				;;
		esac
	done

	# Save CONFIG_TYPE
	echo "CONFIG_TYPE=${config_type}" >> /var/ipfire/ethernet/settings

	# Actions performed only on the very first start
	if [ ! -e "/var/ipfire/main/firstsetup_ok" ]; then
		# Disable using ISP nameservers
		sed -e "s/^USE_ISP_NAMESERVERS=.*/USE_ISP_NAMESERVERS=off/" -i /var/ipfire/dns/settings

		# Enable SSH
		sed -e "s/ENABLE_SSH=.*/ENABLE_SSH=on/g" -i /var/ipfire/remote/settings

		# Disable SSH password authentication
		sed -e "s/^ENABLE_SSH_PASSWORDS=.*/ENABLE_SSH_PASSWORDS=off/" -i /var/ipfire/remote/settings

		# Enable SSH key authentication
		sed -e "s/^ENABLE_SSH_KEYS=.*/ENABLE_SSH_KEYS=on/" -i /var/ipfire/remote/settings

		# Apply SSH settings
		/usr/local/bin/sshctrl

		# Mark SSH to start immediately (but not right now)
		touch /var/ipfire/remote/enablessh
		chown nobody:nobody /var/ipfire/remote/enablessh

		# Firewall rules for SSH and WEBIF
		(
			echo "1,ACCEPT,INPUTFW,ON,std_net_src,ALL,ipfire,RED1,,TCP,,,ON,,,cust_srv,SSH,,,,,,,,,,,00:00,00:00,,AUTO,,dnat,,,,,second"
			echo "2,ACCEPT,INPUTFW,ON,std_net_src,ALL,ipfire,RED1,,TCP,,,ON,,,TGT_PORT,444,,,,,,,,,,,00:00,00:00,,AUTO,,dnat,,,,,second"
		) >> /var/ipfire/firewall/input

		# Download user-data
		local user_data="$(get user-data)"

		# Save user-data script to be executed later
		if [ "${user_data:0:2}" = "#!" ]; then
			echo "${user_data}" > /tmp/aws-user-data.script
			chmod 700 /tmp/aws-user-data.script

			# Run the user-data script
			local now="$(date -u +"%s")"
			/tmp/aws-user-data.script &>/var/log/user-data.log.${now}

			# Delete the script right away
			rm /tmp/aws-user-data.script
		fi

		# This script has now completed the first steps of setup
		touch /var/ipfire/main/firstsetup_ok
	fi

	# All done
	echo_ok
}

case "${reason}" in
	PREINIT)
		# Bring up the interface
		ip link set "${interface}" up
		;;

	BOUND|RENEW|REBIND|REBOOT)
		# Remove any previous IP addresses
		ip addr flush dev "${interface}"

		# Add (or re-add) the new IP address
		ip addr add "${new_ip_address}/${new_subnet_mask}" dev "${interface}"

		# Add the default route
		ip route add default via "${new_routers}"

		# Setup DNS
		for domain_name_server in ${new_domain_name_servers}; do
			echo "nameserver ${domain_name_server}"
		done > /etc/resolv.conf

		# The system is online now
		touch /var/ipfire/red/active

		# Import AWS configuration
		import_aws_configuration
		;;

	EXPIRE|FAIL|RELEASE|STOP)
		# The system is no longer online
		rm -f /var/ipfire/red/active

		# Remove all IP addresses
		ip addr flush dev "${interface}"

		# Shut down the interface
		ip link set "${interface}" down
		;;

	*)
		echo "Unhandled reason: ${reason}" >&2
		exit 2
		;;
esac

# Terminate
exit 0
Commit	Line	Data
bd3bcb45	1	#!/bin/bash
66c36198 PM	2	###############################################################################
	3	# #
	4	# IPFire.org - A linux based firewall #
	5	# Copyright (C) 2007-2022 IPFire Team <info@ipfire.org> #
	6	# #
	7	# This program is free software: you can redistribute it and/or modify #
	8	# it under the terms of the GNU General Public License as published by #
	9	# the Free Software Foundation, either version 3 of the License, or #
	10	# (at your option) any later version. #
	11	# #
	12	# This program is distributed in the hope that it will be useful, #
	13	# but WITHOUT ANY WARRANTY; without even the implied warranty of #
	14	# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the #
	15	# GNU General Public License for more details. #
	16	# #
	17	# You should have received a copy of the GNU General Public License #
	18	# along with this program. If not, see <http://www.gnu.org/licenses/>. #
	19	# #
	20	###############################################################################
bd3bcb45 MT	21
	22	. /etc/sysconfig/rc
	23	. ${rc_functions}
	24
9ae73c30 MT	25	# Set PATH to find our own executables
	26	export PATH=/usr/local/sbin:/usr/local/bin:${PATH}
	27
68e060cb MT	28	# AWS supports an MTU of up to 9001 bytes
	29	DEFAULT_MTU=9001
	30
bd3bcb45 MT	31	get() {
	32	local file="${1}"
	33
4e4c122c	34	wget -qO - "http://169.254.169.254/latest/${file}"
bd3bcb45 MT	35	}
	36
	37	to_address() {
	38	local n="${1}"
	39
	40	local o1=$(( (n & 0xff000000) >> 24 ))
	41	local o2=$(( (n & 0xff0000) >> 16 ))
	42	local o3=$(( (n & 0xff00) >> 8 ))
	43	local o4=$(( (n & 0xff) ))
	44
	45	printf "%d.%d.%d.%d\n" "${o1}" "${o2}" "${o3}" "${o4}"
	46	}
	47
	48	to_integer() {
	49	local address="${1}"
	50
	51	local integer=0
	52
	53	local i
	54	for i in ${address//\./ }; do
	55	integer=$(( (integer << 8) + i ))
	56	done
	57
	58	printf "%d\n" "${integer}"
	59	}
	60
	61	prefix2netmask() {
	62	local prefix=${1}
	63
	64	local zeros=$(( 32 - prefix ))
	65	local netmask=0
	66
	67	local i
	68	for (( i=0; i<${zeros}; i++ )); do
	69	netmask=$(( (netmask << 1) ^ 1 ))
	70	done
	71
	72	to_address "$(( netmask ^ 0xffffffff ))"
	73	}
	74
	75	import_aws_configuration() {
4e4c122c	76	local instance_id="$(get meta-data/instance-id)"
bd3bcb45 MT	77
	78	boot_mesg "Importing AWS configuration for instance ${instance_id}..."
	79
eb7ccf87 MT	80	# Store instance ID
	81	echo "${instance_id}" > /var/run/aws-instance-id
	82
bd3bcb45	83	# Initialise system settings
4e4c122c	84	local hostname=$(get meta-data/local-hostname)
bd3bcb45	85
3273ff48 MT	86	# Set hostname
	87	if ! grep -q "^HOSTNAME=" /var/ipfire/main/settings; then
	88	echo "HOSTNAME=${hostname%%.*}" >> /var/ipfire/main/settings
	89	fi
	90
	91	# Set domainname
	92	if ! grep -q "^DOMAINNAME=" /var/ipfire/main/settings; then
	93	echo "DOMAINNAME=${hostname#*.}" >> /var/ipfire/main/settings
bd3bcb45 MT	94	fi
bd3bcb45 MT	95
1413006b MT	96	# Create setup user
1413006b MT	97	if ! getent passwd setup &>/dev/null; then
e2d9fe7e	98	useradd setup -s /usr/bin/run-setup -g nobody -m
87d7fc66 MT	99
	100	# Unlock the account
	101	usermod -p "x" setup
1413006b	102	fi
2e42a9ea	103
53eb4918 MT	104	# Import SSH keys for setup user
53eb4918 MT	105	local line
4e4c122c	106	for line in $(get "meta-data/public-keys/"); do
53eb4918 MT	107	local key_no="${line%=*}"
53eb4918 MT	108
4e4c122c	109	local key="$(get meta-data/public-keys/${key_no}/openssh-key)"
53eb4918 MT	110	if [ -n "${key}" ] && ! grep -q "^${key}$" "/home/setup/.ssh/authorized_keys" 2>/dev/null; then
	111	mkdir -p "/home/setup/.ssh"
	112	chmod 700 "/home/setup/.ssh"
6a7e6b44	113	chown setup.nobody "/home/setup/.ssh"
53eb4918 MT	114
	115	echo "${key}" >> "/home/setup/.ssh/authorized_keys"
	116	chmod 600 "/home/setup/.ssh/authorized_keys"
6a7e6b44	117	chown setup.nobody "/home/setup/.ssh/authorized_keys"
53eb4918	118	fi
2e42a9ea MT	119	done
2e42a9ea MT	120
bd3bcb45	121	# Import network configuration
2e42a9ea MT	122	# After this, no network connectivity will be available from this script due to the
2e42a9ea MT	123	# renaming of the network interfaces for which they have to be shut down
0f224ad7 MT	124	local config_type=1
0f224ad7 MT	125	: > /var/ipfire/ethernet/settings
bd3bcb45	126
3273ff48	127	local mac
4e4c122c	128	for mac in $(get meta-data/network/interfaces/macs/); do
bd3bcb45 MT	129	# Remove trailing slash
	130	mac="${mac//\//}"
	131
4e4c122c MT	132	local device_number="$(get "meta-data/network/interfaces/macs/${mac}/device-number")"
4e4c122c MT	133	local interface_id="$(get "meta-data/network/interfaces/macs/${mac}/interface-id")"
bd3bcb45 MT	134
bd3bcb45 MT	135	# First IPv4 address
4e4c122c	136	local ipv4_address="$(get "meta-data/network/interfaces/macs/${mac}/local-ipv4s" \| head -n1)"
bd3bcb45 MT	137	local ipv4_address_num="$(to_integer "${ipv4_address}")"
bd3bcb45 MT	138
607240e2	139	# Get VPC subnet
4e4c122c	140	local vpc="$(get "meta-data/network/interfaces/macs/${mac}/vpc-ipv4-cidr-block")"
607240e2 MT	141	local vpc_netaddress="${vpc%/*}"
	142	local vpc_netaddress_num="$(to_integer "${vpc_netaddress}")"
	143
bd3bcb45	144	# Get subnet size
4e4c122c	145	local subnet="$(get "meta-data/network/interfaces/macs/${mac}/subnet-ipv4-cidr-block")"
bd3bcb45 MT	146
	147	local prefix="${subnet#*/}"
	148	local netmask="$(prefix2netmask "${prefix}")"
bd3bcb45 MT	149
	150	# Calculate the network and broadcast addresses
	151	local netaddress="${subnet%/*}"
	152	local netaddress_num="$(to_integer "${netaddress}")"
bd3bcb45	153
bd3bcb45 MT	154	case "${device_number}" in
	155	# RED
	156	0)
c7141f04 MT	157	local interface_name="red0"
c7141f04 MT	158
c86fd963 MT	159	# The gateway is always the first IP address in the subnet
	160	local gateway="$(to_address $(( netaddress_num + 1 )))"
	161
bd3bcb45 MT	162	(
bd3bcb45 MT	163	echo "RED_TYPE=STATIC"
c7141f04	164	echo "RED_DEV=${interface_name}"
bd3bcb45 MT	165	echo "RED_MACADDR=${mac}"
	166	echo "RED_DESCRIPTION='${interface_id}'"
	167	echo "RED_ADDRESS=${ipv4_address}"
	168	echo "RED_NETMASK=${netmask}"
	169	echo "RED_NETADDRESS=${netaddress}"
68e060cb	170	echo "RED_MTU=1500"
bd3bcb45	171	echo "DEFAULT_GATEWAY=${gateway}"
bd3bcb45 MT	172	) >> /var/ipfire/ethernet/settings
	173
	174	# Import aliases for RED
4e4c122c	175	for alias in $(get "meta-data/network/interfaces/macs/${mac}/local-ipv4s" \| tail -n +2); do
bd3bcb45 MT	176	echo "${alias},on,"
	177	done > /var/ipfire/ethernet/aliases
	178	;;
	179
	180	# GREEN
	181	1)
c7141f04 MT	182	local interface_name="green0"
c7141f04 MT	183
bd3bcb45	184	(
c7141f04	185	echo "GREEN_DEV=${interface_name}"
bd3bcb45 MT	186	echo "GREEN_MACADDR=${mac}"
	187	echo "GREEN_DESCRIPTION='${interface_id}'"
	188	echo "GREEN_ADDRESS=${ipv4_address}"
	189	echo "GREEN_NETMASK=${netmask}"
	190	echo "GREEN_NETADDRESS=${netaddress}"
68e060cb	191	echo "GREEN_MTU=${DEFAULT_MTU}"
bd3bcb45 MT	192	) >> /var/ipfire/ethernet/settings
bd3bcb45 MT	193	;;
0f224ad7 MT	194
	195	# ORANGE
	196	2)
c7141f04	197	local interface_name="orange0"
0f224ad7 MT	198	config_type=2
	199
	200	(
c7141f04	201	echo "ORANGE_DEV=${interface_name}"
0f224ad7 MT	202	echo "ORANGE_MACADDR=${mac}"
	203	echo "ORANGE_DESCRIPTION='${interface_id}'"
	204	echo "ORANGE_ADDRESS=${ipv4_address}"
	205	echo "ORANGE_NETMASK=${netmask}"
	206	echo "ORANGE_NETADDRESS=${netaddress}"
68e060cb	207	echo "ORANGE_MTU=${DEFAULT_MTU}"
0f224ad7 MT	208	) >> /var/ipfire/ethernet/settings
0f224ad7 MT	209	;;
bd3bcb45 MT	210	esac
	211	done
	212
0f224ad7 MT	213	# Save CONFIG_TYPE
	214	echo "CONFIG_TYPE=${config_type}" >> /var/ipfire/ethernet/settings
	215
bd3bcb45 MT	216	# Actions performed only on the very first start
bd3bcb45 MT	217	if [ ! -e "/var/ipfire/main/firstsetup_ok" ]; then
88cb5eb1 MT	218	# Disable using ISP nameservers
	219	sed -e "s/^USE_ISP_NAMESERVERS=.*/USE_ISP_NAMESERVERS=off/" -i /var/ipfire/dns/settings
	220
7fa83c2f	221	# Enable SSH
8b59ef08 MT	222	sed -e "s/ENABLE_SSH=.*/ENABLE_SSH=on/g" -i /var/ipfire/remote/settings
8b59ef08 MT	223
0cf70cae MT	224	# Disable SSH password authentication
	225	sed -e "s/^ENABLE_SSH_PASSWORDS=.*/ENABLE_SSH_PASSWORDS=off/" -i /var/ipfire/remote/settings
	226
7fa83c2f MT	227	# Enable SSH key authentication
	228	sed -e "s/^ENABLE_SSH_KEYS=.*/ENABLE_SSH_KEYS=on/" -i /var/ipfire/remote/settings
	229
8f2c3b49 MT	230	# Apply SSH settings
	231	/usr/local/bin/sshctrl
	232
693208bf MT	233	# Mark SSH to start immediately (but not right now)
	234	touch /var/ipfire/remote/enablessh
	235	chown nobody:nobody /var/ipfire/remote/enablessh
	236
bd3bcb45 MT	237	# Firewall rules for SSH and WEBIF
	238	(
	239	echo "1,ACCEPT,INPUTFW,ON,std_net_src,ALL,ipfire,RED1,,TCP,,,ON,,,cust_srv,SSH,,,,,,,,,,,00:00,00:00,,AUTO,,dnat,,,,,second"
	240	echo "2,ACCEPT,INPUTFW,ON,std_net_src,ALL,ipfire,RED1,,TCP,,,ON,,,TGT_PORT,444,,,,,,,,,,,00:00,00:00,,AUTO,,dnat,,,,,second"
	241	) >> /var/ipfire/firewall/input
	242
9e413732 MT	243	# Download user-data
	244	local user_data="$(get user-data)"
	245
	246	# Save user-data script to be executed later
	247	if [ "${user_data:0:2}" = "#!" ]; then
	248	echo "${user_data}" > /tmp/aws-user-data.script
	249	chmod 700 /tmp/aws-user-data.script
	250
	251	# Run the user-data script
	252	local now="$(date -u +"%s")"
	253	/tmp/aws-user-data.script &>/var/log/user-data.log.${now}
	254
	255	# Delete the script right away
	256	rm /tmp/aws-user-data.script
	257	fi
	258
bd3bcb45 MT	259	# This script has now completed the first steps of setup
	260	touch /var/ipfire/main/firstsetup_ok
	261	fi
	262
	263	# All done
	264	echo_ok
	265	}
	266
	267	case "${reason}" in
	268	PREINIT)
	269	# Bring up the interface
	270	ip link set "${interface}" up
	271	;;
	272
	273	BOUND\|RENEW\|REBIND\|REBOOT)
	274	# Remove any previous IP addresses
	275	ip addr flush dev "${interface}"
	276
	277	# Add (or re-add) the new IP address
	278	ip addr add "${new_ip_address}/${new_subnet_mask}" dev "${interface}"
	279
	280	# Add the default route
	281	ip route add default via "${new_routers}"
	282
647ca912 MT	283	# Setup DNS
	284	for domain_name_server in ${new_domain_name_servers}; do
	285	echo "nameserver ${domain_name_server}"
	286	done > /etc/resolv.conf
	287
	288	# The system is online now
	289	touch /var/ipfire/red/active
	290
bd3bcb45 MT	291	# Import AWS configuration
	292	import_aws_configuration
	293	;;
	294
	295	EXPIRE\|FAIL\|RELEASE\|STOP)
647ca912 MT	296	# The system is no longer online
	297	rm -f /var/ipfire/red/active
	298
bd3bcb45 MT	299	# Remove all IP addresses
bd3bcb45 MT	300	ip addr flush dev "${interface}"
c5465a94 MT	301
	302	# Shut down the interface
	303	ip link set "${interface}" down
bd3bcb45 MT	304	;;
	305
	306	*)
	307	echo "Unhandled reason: ${reason}" >&2
	308	exit 2
	309	;;
	310	esac
	311
	312	# Terminate
	313	exit 0