[ipfire-2.x.git] / src / initscripts / system / unbound

#!/bin/sh
# Begin $rc_base/init.d/unbound

# Description : Unbound DNS resolver boot script for IPfire
# Author      : Marcel Lorenz <marcel.lorenz@ipfire.org>

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

TEST_DOMAIN="ipfire.org"

# This domain will never validate
TEST_DOMAIN_FAIL="dnssec-failed.org"

INSECURE_ZONES=
USE_FORWARDERS=1

# Cache any local zones for 60 seconds
LOCAL_TTL=60

# EDNS buffer size
EDNS_DEFAULT_BUFFER_SIZE=4096

# Load optional configuration
[ -e "/etc/sysconfig/unbound" ] && . /etc/sysconfig/unbound

function cidr() {
    local cidr nbits IFS;
    IFS=. read -r i1 i2 i3 i4 <<< ${1}
    IFS=. read -r m1 m2 m3 m4 <<< ${2}
    cidr=$(printf "%d.%d.%d.%d\n" "$((i1 & m1))" "$((i2 & m2))" "$((i3 & m3))" "$((i4 & m4))")
    nbits=0
    IFS=.
    for dec in $2 ; do
        case $dec in
            255) let nbits+=8;;
            254) let nbits+=7;;
            252) let nbits+=6;;
            248) let nbits+=5;;
            240) let nbits+=4;;
            224) let nbits+=3;;
            192) let nbits+=2;;
            128) let nbits+=1;;
            0);;
            *) echo "Error: $dec is not recognised"; exit 1
        esac
    done
    echo "${cidr}/${nbits}"
}

ip_address_revptr() {
	local addr=${1}

	local a1 a2 a3 a4
	IFS=. read -r a1 a2 a3 a4 <<< ${addr}

	echo "${a4}.${a3}.${a2}.${a1}.in-addr.arpa"
}

read_name_servers() {
	local i
	for i in 1 2; do
		echo "$(</var/ipfire/red/dns${i})"
	done | xargs echo
}

config_header() {
	echo "# This file is automatically generated and any changes"
	echo "# will be overwritten. DO NOT EDIT!"
	echo
}

update_forwarders() {
	if [ "${USE_FORWARDERS}" = "1" -a -e "/var/ipfire/red/active" ]; then
		local forwarders
		local broken_forwarders

		local ns
		for ns in $(read_name_servers); do
			test_name_server ${ns} &>/dev/null
			case "$?" in
				# Only use DNSSEC-validating or DNSSEC-aware name servers
				0|2)
					forwarders="${forwarders} ${ns}"
					;;
				*)
					broken_forwarders="${broken_forwarders} ${ns}"
					;;
			esac
		done

		# Determine EDNS buffer size
		local new_edns_buffer_size=${EDNS_DEFAULT_BUFFER_SIZE}

		for ns in ${forwarders}; do
			local edns_buffer_size=$(ns_determine_edns_buffer_size ${ns})
			if [ -n "${edns_buffer_size}" ]; then
				if [ ${edns_buffer_size} -lt ${new_edns_buffer_size} ]; then
					new_edns_buffer_size=${edns_buffer_size}
				fi
			fi
		done

		if [ ${new_edns_buffer_size} -lt ${EDNS_DEFAULT_BUFFER_SIZE} ]; then
			boot_mesg "EDNS buffer size reduced to ${new_edns_buffer_size}" ${WARNING}
			echo_warning

			unbound-control -q set_option edns-buffer-size: ${new_edns_buffer_size}
		fi

		# Show warning for any broken upstream name servers
		if [ -n "${broken_forwarders}" ]; then
			boot_mesg "Ignoring broken upstream name server(s): ${broken_forwarders:1}" ${WARNING}
			echo_warning
		fi

		if [ -n "${forwarders}" ]; then
			boot_mesg "Configuring upstream name server(s): ${forwarders:1}" ${INFO}
			echo_ok

			# Make sure DNSSEC is activated
			enable_dnssec

			echo "${forwarders}" > /var/ipfire/red/dns
			unbound-control -q forward ${forwarders}
			return 0

		# In case we have found no working forwarders
		else
			# Test if the recursor mode is available
			if can_resolve_root +bufsize=${new_edns_buffer_size}; then
				# Make sure DNSSEC is activated
				enable_dnssec

				boot_mesg "Falling back to recursor mode" ${WARNING}
				echo_warning

			# If not, we set DNSSEC in permissive mode and allow using all recursors
			elif [ -n "${broken_forwarders}" ]; then
				disable_dnssec

				boot_mesg "DNSSEC has been set to permissive mode" ${FAILURE}
				echo_failure

				echo "${broken_forwarders}" > /var/ipfire/red/dns
				unbound-control -q forward ${broken_forwarders}
				return 0
			fi
		fi
	fi

	# If forwarders cannot be used we run in recursor mode
	echo "local recursor" > /var/ipfire/red/dns
	unbound-control -q forward off
}

own_hostname() {
	local hostname=$(hostname -f)
	# 1.1.1.1 is reserved for unused green, skip this
	if [ -n "${GREEN_ADDRESS}" -a "${GREEN_ADDRESS}" != "1.1.1.1" ]; then
		unbound-control -q local_data "${hostname} ${LOCAL_TTL} IN A ${GREEN_ADDRESS}"
	fi

	local address
	for address in ${GREEN_ADDRESS} ${BLUE_ADDRESS} ${ORANGE_ADDRESS}; do
		[ -n "${address}" ] || continue
		[ "${address}" = "1.1.1.1" ] && continue

		address=$(ip_address_revptr ${address})
		unbound-control -q local_data "${address} ${LOCAL_TTL} IN PTR ${hostname}"
	done
}

update_hosts() {
	local enabled address hostname domainname

	while IFS="," read -r enabled address hostname domainname; do
		[ "${enabled}" = "on" ] || continue

		# Build FQDN
		local fqdn="${hostname}.${domainname}"

		unbound-control -q local_data "${fqdn} ${LOCAL_TTL} IN A ${address}"

		# Skip reverse resolution if the address equals the GREEN address
		[ "${address}" = "${GREEN_ADDRESS}" ] && continue

		# Add RDNS
		address=$(ip_address_revptr ${address})
		unbound-control -q local_data "${address} ${LOCAL_TTL} IN PTR ${fqdn}"
	done < /var/ipfire/main/hosts
}

write_forward_conf() {
	(
		config_header

		local insecure_zones="${INSECURE_ZONES}"

		local enabled zone server remark
		while IFS="," read -r enabled zone server remark; do
			# Line must be enabled.
			[ "${enabled}" = "on" ] || continue

			# Zones that end with .local are commonly used for internal
			# zones and therefore not signed
			case "${zone}" in
				*.local)
					insecure_zones="${insecure_zones} ${zone}"
					;;
			esac

			echo "forward-zone:"
			echo "	name: ${zone}"
			echo "	forward-addr: ${server}"
			echo
		done < /var/ipfire/dnsforward/config

		if [ -n "${insecure_zones}" ]; then
			echo "server:"

			for zone in ${insecure_zones}; do
				echo "	domain-insecure: ${zone}"
			done
		fi
	) > /etc/unbound/forward.conf
}

write_tuning_conf() {
	# https://www.unbound.net/documentation/howto_optimise.html

	# Determine number of online processors
	local processors=$(getconf _NPROCESSORS_ONLN)

	# Determine number of slabs
	local slabs=1
	while [ ${slabs} -lt ${processors} ]; do
		slabs=$(( ${slabs} * 2 ))
	done

	# Determine amount of system memory
	local mem=$(get_memory_amount)

	# In the worst case scenario, unbound can use double the
	# amount of memory allocated to a cache due to malloc overhead

	# Large systems with more than 2GB of RAM
	if [ ${mem} -ge 2048 ]; then
		mem=128

	# Small systems with less than 256MB of RAM
	elif [ ${mem} -le 256 ]; then
		mem=8

	# Everything else
	else
		mem=32
	fi

	(
		config_header

		# We run one thread per processor
		echo "num-threads: ${processors}"

		# Adjust number of slabs
		echo "infra-cache-slabs: ${slabs}"
		echo "key-cache-slabs: ${slabs}"
		echo "msg-cache-slabs: ${slabs}"
		echo "rrset-cache-slabs: ${slabs}"

		# Slice up the cache
		echo "rrset-cache-size: $(( ${mem} / 2 ))m"
		echo "msg-cache-size: $(( ${mem} / 4 ))m"
		echo "key-cache-size: $(( ${mem} / 4 ))m"
	) > /etc/unbound/tuning.conf
}

get_memory_amount() {
	local key val unit

	while read -r key val unit; do
		case "${key}" in
			MemTotal:*)
				# Convert to MB
				echo "$(( ${val} / 1024 ))"
				break
				;;
		esac
	done < /proc/meminfo
}

test_name_server() {
	local ns=${1}
	local args

	# Return codes:
	# 0	DNSSEC validating
	# 1	Error: unreachable, etc.
	# 2	DNSSEC aware
	# 3	NOT DNSSEC-aware

	# Exit when the server is not reachable
	ns_is_online ${ns} || return 1

	# Determine the maximum edns buffer size that works
	local edns_buffer_size=$(ns_determine_edns_buffer_size ${ns})
	if [ -n "${edns_buffer_size}" ]; then
		args="${args} +bufsize=${edns_buffer_size}"
	fi

	local errors
	for rr in DNSKEY DS RRSIG; do
		if ! ns_forwards_${rr} ${ns} ${args}; then
			errors="${errors} ${rr}"
		fi
	done

	if [ -n "${errors}" ]; then
		echo >&2 "Unable to retrieve the following resource records from ${ns}: ${errors:1}"
		return 3
	fi

	if ns_is_validating ${ns} ${args}; then
		# Return 0 if validating
		return 0
	else
		# Is DNSSEC-aware
		return 2
	fi
}

# Sends an A query to the nameserver w/o DNSSEC
ns_is_online() {
	local ns=${1}
	shift

	dig @${ns} +nodnssec A ${TEST_DOMAIN} $@ >/dev/null
}

# Resolving ${TEST_DOMAIN_FAIL} will fail if the nameserver is validating
ns_is_validating() {
	local ns=${1}
	shift

	dig @${ns} A ${TEST_DOMAIN_FAIL} $@ | grep -q SERVFAIL
}

# Checks if we can retrieve the DNSKEY for this domain.
# dig will print the SOA if nothing was found
ns_forwards_DNSKEY() {
	local ns=${1}
	shift

	dig @${ns} DNSKEY ${TEST_DOMAIN} $@ | grep -qv SOA
}

ns_forwards_DS() {
	local ns=${1}
	shift

	dig @${ns} DS ${TEST_DOMAIN} $@ | grep -qv SOA
}

ns_forwards_RRSIG() {
	local ns=${1}
	shift

	dig @${ns} +dnssec A ${TEST_DOMAIN} $@ | grep -q RRSIG
}

ns_supports_tcp() {
	local ns=${1}
	shift

	dig @${ns} +tcp A ${TEST_DOMAIN} $@ >/dev/null || return 1
}

ns_determine_edns_buffer_size() {
	local ns=${1}
	shift

	local b
	for b in 4096 2048 1500 1480 1464 1400 1280 512; do
		if dig @${ns} +dnssec +bufsize=${b} A ${TEST_DOMAIN} $@ >/dev/null; then
			echo "${b}"
			return 0
		fi
	done

	return 1
}

get_root_nameservers() {
	while read -r hostname ttl record address; do
		# Searching for A records
		[ "${record}" = "A" ] || continue

		echo "${address}"
	done < /etc/unbound/root.hints
}

can_resolve_root() {
	local ns
	for ns in $(get_root_nameservers); do
		if dig @${ns} +dnssec SOA . $@ >/dev/null; then
			return 0
		fi
	done

	# none of the servers was reachable
	return 1
}

enable_dnssec() {
	local status=$(unbound-control get_option val-permissive-mode)

	# Don't do anything if DNSSEC is already activated
	[ "${status}" = "no" ] && return 0

	# Activate DNSSEC and flush cache with any stale and unvalidated data
	unbound-control -q set_option val-permissive-mode: no
	unbound-control -q flush_zone .
}

disable_dnssec() {
	unbound-control -q set_option val-permissive-mode: yes
}

case "$1" in
	start)
		# Print a nicer messagen when unbound is already running
		if pidofproc -s unbound; then
			statusproc /usr/sbin/unbound
			exit 0
		fi

		eval $(/usr/local/bin/readhash /var/ipfire/ethernet/settings)

		# Create control keys at first run
		if [ ! -r "/etc/unbound/unbound_control.key" ]; then
			unbound-control-setup -d /etc/unbound &>/dev/null
		fi

		# Update configuration files
		write_tuning_conf
		write_forward_conf

		boot_mesg "Starting Unbound DNS Proxy..."
		loadproc /usr/sbin/unbound || exit $?

		# Make own hostname resolveable
		own_hostname

		# Update any known forwarding name servers
		update_forwarders

		# Update hosts
		update_hosts
		;;

	stop)
		boot_mesg "Stopping Unbound DNS Proxy..."
		killproc /usr/sbin/unbound
		;;

	restart)
		$0 stop
		sleep 1
		$0 start
		;;

	status)
		statusproc /usr/sbin/unbound
		;;

	update-forwarders)
		# Do not try updating forwarders when unbound is not running
		if ! pgrep unbound &>/dev/null; then
			exit 0
		fi

		update_forwarders
		;;

	test-name-server)
		ns=${2}

		test_name_server ${ns}
		ret=${?}

		case "${ret}" in
			0)
				echo "${ns} is validating"
				;;
			2)
				echo "${ns} is DNSSEC-aware"
				;;
			3)
				echo "${ns} is NOT DNSSEC-aware"
				;;
			*)
				echo "Test failed for an unknown reason"
				exit ${ret}
				;;
		esac

		if ns_supports_tcp ${ns}; then
			echo "${ns} supports TCP fallback"
		else
			echo "${ns} does not support TCP fallback"
		fi

		edns_buffer_size=$(ns_determine_edns_buffer_size ${ns})
		if [ -n "${edns_buffer_size}" ]; then
			echo "EDNS buffer size for ${ns}: ${edns_buffer_size}"
		fi

		exit ${ret}
		;;

	*)
		echo "Usage: $0 {start|stop|restart|status|update-forwarders|test-name-server}"
		exit 1
		;;
esac

# End $rc_base/init.d/unbound
Commit	Line	Data
d0e5f71f ML	1	#!/bin/sh
	2	# Begin $rc_base/init.d/unbound
	3
	4	# Description : Unbound DNS resolver boot script for IPfire
	5	# Author : Marcel Lorenz <marcel.lorenz@ipfire.org>
d0e5f71f ML	6
	7	. /etc/sysconfig/rc
	8	. ${rc_functions}
	9
b29c97b1 AF	10	TEST_DOMAIN="ipfire.org"
	11
	12	# This domain will never validate
	13	TEST_DOMAIN_FAIL="dnssec-failed.org"
	14
7ebc0a16	15	INSECURE_ZONES=
b8f5eda8	16	USE_FORWARDERS=1
d0e5f71f	17
36792be6 MT	18	# Cache any local zones for 60 seconds
	19	LOCAL_TTL=60
	20
b2f96a94 MT	21	# EDNS buffer size
	22	EDNS_DEFAULT_BUFFER_SIZE=4096
	23
b8f5eda8 MT	24	# Load optional configuration
b8f5eda8 MT	25	[ -e "/etc/sysconfig/unbound" ] && . /etc/sysconfig/unbound
d0e5f71f ML	26
	27	function cidr() {
	28	local cidr nbits IFS;
	29	IFS=. read -r i1 i2 i3 i4 <<< ${1}
	30	IFS=. read -r m1 m2 m3 m4 <<< ${2}
	31	cidr=$(printf "%d.%d.%d.%d\n" "$((i1 & m1))" "$((i2 & m2))" "$((i3 & m3))" "$((i4 & m4))")
	32	nbits=0
	33	IFS=.
	34	for dec in $2 ; do
	35	case $dec in
	36	255) let nbits+=8;;
	37	254) let nbits+=7;;
	38	252) let nbits+=6;;
	39	248) let nbits+=5;;
	40	240) let nbits+=4;;
	41	224) let nbits+=3;;
	42	192) let nbits+=2;;
	43	128) let nbits+=1;;
	44	0);;
	45	*) echo "Error: $dec is not recognised"; exit 1
	46	esac
	47	done
	48	echo "${cidr}/${nbits}"
	49	}
	50
f75c279b AF	51	ip_address_revptr() {
	52	local addr=${1}
	53
	54	local a1 a2 a3 a4
	55	IFS=. read -r a1 a2 a3 a4 <<< ${addr}
	56
	57	echo "${a4}.${a3}.${a2}.${a1}.in-addr.arpa"
	58	}
	59
b8f5eda8 MT	60	read_name_servers() {
	61	local i
	62	for i in 1 2; do
	63	echo "$(</var/ipfire/red/dns${i})"
	64	done \| xargs echo
	65	}
	66
	67	config_header() {
	68	echo "# This file is automatically generated and any changes"
	69	echo "# will be overwritten. DO NOT EDIT!"
	70	echo
	71	}
	72
	73	update_forwarders() {
b29c97b1 AF	74	if [ "${USE_FORWARDERS}" = "1" -a -e "/var/ipfire/red/active" ]; then
	75	local forwarders
	76	local broken_forwarders
	77
	78	local ns
	79	for ns in $(read_name_servers); do
	80	test_name_server ${ns} &>/dev/null
	81	case "$?" in
	82	# Only use DNSSEC-validating or DNSSEC-aware name servers
	83	0\|2)
	84	forwarders="${forwarders} ${ns}"
	85	;;
	86	*)
	87	broken_forwarders="${broken_forwarders} ${ns}"
	88	;;
	89	esac
	90	done
	91
8f3034d0	92	# Determine EDNS buffer size
b2f96a94	93	local new_edns_buffer_size=${EDNS_DEFAULT_BUFFER_SIZE}
8f3034d0	94
b2f96a94 MT	95	for ns in ${forwarders}; do
	96	local edns_buffer_size=$(ns_determine_edns_buffer_size ${ns})
	97	if [ -n "${edns_buffer_size}" ]; then
	98	if [ ${edns_buffer_size} -lt ${new_edns_buffer_size} ]; then
	99	new_edns_buffer_size=${edns_buffer_size}
8f3034d0	100	fi
b2f96a94 MT	101	fi
	102	done
	103
	104	if [ ${new_edns_buffer_size} -lt ${EDNS_DEFAULT_BUFFER_SIZE} ]; then
	105	boot_mesg "EDNS buffer size reduced to ${new_edns_buffer_size}" ${WARNING}
	106	echo_warning
8f3034d0 MT	107
	108	unbound-control -q set_option edns-buffer-size: ${new_edns_buffer_size}
	109	fi
	110
b29c97b1 AF	111	# Show warning for any broken upstream name servers
	112	if [ -n "${broken_forwarders}" ]; then
	113	boot_mesg "Ignoring broken upstream name server(s): ${broken_forwarders:1}" ${WARNING}
	114	echo_warning
	115	fi
b8f5eda8	116
e432689a	117	if [ -n "${forwarders}" ]; then
b29c97b1 AF	118	boot_mesg "Configuring upstream name server(s): ${forwarders:1}" ${INFO}
b29c97b1 AF	119	echo_ok
b8f5eda8	120
e432689a MT	121	# Make sure DNSSEC is activated
	122	enable_dnssec
	123
e24d6112	124	echo "${forwarders}" > /var/ipfire/red/dns
b29c97b1 AF	125	unbound-control -q forward ${forwarders}
b29c97b1 AF	126	return 0
e432689a MT	127
	128	# In case we have found no working forwarders
	129	else
	130	# Test if the recursor mode is available
	131	if can_resolve_root +bufsize=${new_edns_buffer_size}; then
	132	# Make sure DNSSEC is activated
	133	enable_dnssec
	134
	135	boot_mesg "Falling back to recursor mode" ${WARNING}
	136	echo_warning
	137
	138	# If not, we set DNSSEC in permissive mode and allow using all recursors
	139	elif [ -n "${broken_forwarders}" ]; then
	140	disable_dnssec
	141
	142	boot_mesg "DNSSEC has been set to permissive mode" ${FAILURE}
	143	echo_failure
	144
	145	echo "${broken_forwarders}" > /var/ipfire/red/dns
	146	unbound-control -q forward ${broken_forwarders}
	147	return 0
	148	fi
b29c97b1	149	fi
b8f5eda8	150	fi
b29c97b1 AF	151
b29c97b1 AF	152	# If forwarders cannot be used we run in recursor mode
e24d6112	153	echo "local recursor" > /var/ipfire/red/dns
b29c97b1	154	unbound-control -q forward off
b8f5eda8 MT	155	}
b8f5eda8 MT	156
f75c279b AF	157	own_hostname() {
f75c279b AF	158	local hostname=$(hostname -f)
0d7ca700	159	# 1.1.1.1 is reserved for unused green, skip this
f75c279b AF	160	if [ -n "${GREEN_ADDRESS}" -a "${GREEN_ADDRESS}" != "1.1.1.1" ]; then
	161	unbound-control -q local_data "${hostname} ${LOCAL_TTL} IN A ${GREEN_ADDRESS}"
	162	fi
	163
	164	local address
	165	for address in ${GREEN_ADDRESS} ${BLUE_ADDRESS} ${ORANGE_ADDRESS}; do
	166	[ -n "${address}" ] \|\| continue
	167	[ "${address}" = "1.1.1.1" ] && continue
	168
	169	address=$(ip_address_revptr ${address})
	170	unbound-control -q local_data "${address} ${LOCAL_TTL} IN PTR ${hostname}"
	171	done
	172	}
	173
36792be6 MT	174	update_hosts() {
	175	local enabled address hostname domainname
	176
	177	while IFS="," read -r enabled address hostname domainname; do
	178	[ "${enabled}" = "on" ] \|\| continue
	179
	180	# Build FQDN
	181	local fqdn="${hostname}.${domainname}"
	182
	183	unbound-control -q local_data "${fqdn} ${LOCAL_TTL} IN A ${address}"
f75c279b	184
868d2a1f MT	185	# Skip reverse resolution if the address equals the GREEN address
	186	[ "${address}" = "${GREEN_ADDRESS}" ] && continue
	187
f75c279b AF	188	# Add RDNS
	189	address=$(ip_address_revptr ${address})
	190	unbound-control -q local_data "${address} ${LOCAL_TTL} IN PTR ${fqdn}"
36792be6 MT	191	done < /var/ipfire/main/hosts
	192	}
	193
b8f5eda8 MT	194	write_forward_conf() {
	195	(
	196	config_header
	197
7ebc0a16	198	local insecure_zones="${INSECURE_ZONES}"
a6dcc5bb	199
b8f5eda8 MT	200	local enabled zone server remark
	201	while IFS="," read -r enabled zone server remark; do
	202	# Line must be enabled.
	203	[ "${enabled}" = "on" ] \|\| continue
	204
a6dcc5bb MT	205	# Zones that end with .local are commonly used for internal
	206	# zones and therefore not signed
	207	case "${zone}" in
	208	*.local)
	209	insecure_zones="${insecure_zones} ${zone}"
	210	;;
	211	esac
	212
b8f5eda8 MT	213	echo "forward-zone:"
	214	echo " name: ${zone}"
	215	echo " forward-addr: ${server}"
	216	echo
	217	done < /var/ipfire/dnsforward/config
a6dcc5bb MT	218
	219	if [ -n "${insecure_zones}" ]; then
	220	echo "server:"
	221
	222	for zone in ${insecure_zones}; do
	223	echo " domain-insecure: ${zone}"
	224	done
	225	fi
b8f5eda8 MT	226	) > /etc/unbound/forward.conf
	227	}
	228
b658a451 MT	229	write_tuning_conf() {
	230	# https://www.unbound.net/documentation/howto_optimise.html
	231
	232	# Determine number of online processors
	233	local processors=$(getconf _NPROCESSORS_ONLN)
	234
	235	# Determine number of slabs
	236	local slabs=1
	237	while [ ${slabs} -lt ${processors} ]; do
	238	slabs=$(( ${slabs} * 2 ))
	239	done
	240
	241	# Determine amount of system memory
	242	local mem=$(get_memory_amount)
	243
	244	# In the worst case scenario, unbound can use double the
	245	# amount of memory allocated to a cache due to malloc overhead
	246
	247	# Large systems with more than 2GB of RAM
	248	if [ ${mem} -ge 2048 ]; then
	249	mem=128
	250
	251	# Small systems with less than 256MB of RAM
	252	elif [ ${mem} -le 256 ]; then
	253	mem=8
	254
	255	# Everything else
	256	else
	257	mem=32
	258	fi
	259
	260	(
	261	config_header
	262
	263	# We run one thread per processor
	264	echo "num-threads: ${processors}"
	265
	266	# Adjust number of slabs
	267	echo "infra-cache-slabs: ${slabs}"
	268	echo "key-cache-slabs: ${slabs}"
	269	echo "msg-cache-slabs: ${slabs}"
	270	echo "rrset-cache-slabs: ${slabs}"
	271
	272	# Slice up the cache
	273	echo "rrset-cache-size: $(( ${mem} / 2 ))m"
	274	echo "msg-cache-size: $(( ${mem} / 4 ))m"
	275	echo "key-cache-size: $(( ${mem} / 4 ))m"
	276	) > /etc/unbound/tuning.conf
	277	}
	278
	279	get_memory_amount() {
	280	local key val unit
	281
	282	while read -r key val unit; do
	283	case "${key}" in
	284	MemTotal:*)
	285	# Convert to MB
	286	echo "$(( ${val} / 1024 ))"
	287	break
	288	;;
	289	esac
	290	done < /proc/meminfo
	291	}
b8f5eda8	292
b29c97b1 AF	293	test_name_server() {
b29c97b1 AF	294	local ns=${1}
8f3034d0	295	local args
b29c97b1 AF	296
	297	# Return codes:
	298	# 0 DNSSEC validating
	299	# 1 Error: unreachable, etc.
	300	# 2 DNSSEC aware
	301	# 3 NOT DNSSEC-aware
	302
	303	# Exit when the server is not reachable
	304	ns_is_online ${ns} \|\| return 1
	305
8f3034d0 MT	306	# Determine the maximum edns buffer size that works
	307	local edns_buffer_size=$(ns_determine_edns_buffer_size ${ns})
	308	if [ -n "${edns_buffer_size}" ]; then
	309	args="${args} +bufsize=${edns_buffer_size}"
	310	fi
	311
b29c97b1 AF	312	local errors
b29c97b1 AF	313	for rr in DNSKEY DS RRSIG; do
8f3034d0	314	if ! ns_forwards_${rr} ${ns} ${args}; then
b29c97b1 AF	315	errors="${errors} ${rr}"
	316	fi
	317	done
	318
	319	if [ -n "${errors}" ]; then
	320	echo >&2 "Unable to retrieve the following resource records from ${ns}: ${errors:1}"
	321	return 3
	322	fi
	323
8f3034d0	324	if ns_is_validating ${ns} ${args}; then
2aa15dee MT	325	# Return 0 if validating
	326	return 0
	327	else
	328	# Is DNSSEC-aware
	329	return 2
	330	fi
b29c97b1 AF	331	}
	332
	333	# Sends an A query to the nameserver w/o DNSSEC
	334	ns_is_online() {
	335	local ns=${1}
8f3034d0	336	shift
b29c97b1	337
8f3034d0	338	dig @${ns} +nodnssec A ${TEST_DOMAIN} $@ >/dev/null
b29c97b1 AF	339	}
	340
	341	# Resolving ${TEST_DOMAIN_FAIL} will fail if the nameserver is validating
	342	ns_is_validating() {
	343	local ns=${1}
8f3034d0	344	shift
b29c97b1	345
8f3034d0	346	dig @${ns} A ${TEST_DOMAIN_FAIL} $@ \| grep -q SERVFAIL
b29c97b1 AF	347	}
	348
	349	# Checks if we can retrieve the DNSKEY for this domain.
	350	# dig will print the SOA if nothing was found
	351	ns_forwards_DNSKEY() {
	352	local ns=${1}
8f3034d0	353	shift
b29c97b1	354
8f3034d0	355	dig @${ns} DNSKEY ${TEST_DOMAIN} $@ \| grep -qv SOA
b29c97b1 AF	356	}
	357
	358	ns_forwards_DS() {
	359	local ns=${1}
8f3034d0	360	shift
b29c97b1	361
8f3034d0	362	dig @${ns} DS ${TEST_DOMAIN} $@ \| grep -qv SOA
b29c97b1 AF	363	}
	364
	365	ns_forwards_RRSIG() {
	366	local ns=${1}
8f3034d0	367	shift
b29c97b1	368
8f3034d0	369	dig @${ns} +dnssec A ${TEST_DOMAIN} $@ \| grep -q RRSIG
b29c97b1 AF	370	}
	371
	372	ns_supports_tcp() {
	373	local ns=${1}
8f3034d0 MT	374	shift
	375
	376	dig @${ns} +tcp A ${TEST_DOMAIN} $@ >/dev/null \|\| return 1
	377	}
	378
	379	ns_determine_edns_buffer_size() {
	380	local ns=${1}
	381	shift
	382
	383	local b
	384	for b in 4096 2048 1500 1480 1464 1400 1280 512; do
	385	if dig @${ns} +dnssec +bufsize=${b} A ${TEST_DOMAIN} $@ >/dev/null; then
	386	echo "${b}"
	387	return 0
	388	fi
	389	done
b29c97b1	390
8f3034d0	391	return 1
b29c97b1 AF	392	}
b29c97b1 AF	393
e432689a MT	394	get_root_nameservers() {
	395	while read -r hostname ttl record address; do
	396	# Searching for A records
	397	[ "${record}" = "A" ] \|\| continue
	398
	399	echo "${address}"
	400	done < /etc/unbound/root.hints
	401	}
	402
	403	can_resolve_root() {
	404	local ns
	405	for ns in $(get_root_nameservers); do
	406	if dig @${ns} +dnssec SOA . $@ >/dev/null; then
	407	return 0
	408	fi
	409	done
	410
	411	# none of the servers was reachable
	412	return 1
	413	}
	414
	415	enable_dnssec() {
	416	local status=$(unbound-control get_option val-permissive-mode)
	417
	418	# Don't do anything if DNSSEC is already activated
	419	[ "${status}" = "no" ] && return 0
	420
	421	# Activate DNSSEC and flush cache with any stale and unvalidated data
	422	unbound-control -q set_option val-permissive-mode: no
	423	unbound-control -q flush_zone .
	424	}
	425
	426	disable_dnssec() {
	427	unbound-control -q set_option val-permissive-mode: yes
	428	}
	429
d0e5f71f ML	430	case "$1" in
d0e5f71f ML	431	start)
80bc6022 MT	432	# Print a nicer messagen when unbound is already running
	433	if pidofproc -s unbound; then
	434	statusproc /usr/sbin/unbound
	435	exit 0
	436	fi
	437
b8f5eda8	438	eval $(/usr/local/bin/readhash /var/ipfire/ethernet/settings)
d0e5f71f	439
b8f5eda8 MT	440	# Create control keys at first run
	441	if [ ! -r "/etc/unbound/unbound_control.key" ]; then
	442	unbound-control-setup -d /etc/unbound &>/dev/null
	443	fi
	444
	445	# Update configuration files
b658a451	446	write_tuning_conf
b8f5eda8 MT	447	write_forward_conf
	448
	449	boot_mesg "Starting Unbound DNS Proxy..."
	450	loadproc /usr/sbin/unbound \|\| exit $?
	451
f75c279b AF	452	# Make own hostname resolveable
	453	own_hostname
	454
b8f5eda8 MT	455	# Update any known forwarding name servers
b8f5eda8 MT	456	update_forwarders
36792be6 MT	457
	458	# Update hosts
	459	update_hosts
b8f5eda8	460	;;
d0e5f71f ML	461
d0e5f71f ML	462	stop)
b8f5eda8 MT	463	boot_mesg "Stopping Unbound DNS Proxy..."
	464	killproc /usr/sbin/unbound
	465	;;
d0e5f71f ML	466
d0e5f71f ML	467	restart)
b8f5eda8 MT	468	$0 stop
	469	sleep 1
	470	$0 start
	471	;;
d0e5f71f ML	472
d0e5f71f ML	473	status)
b8f5eda8	474	statusproc /usr/sbin/unbound
b8f5eda8 MT	475	;;
	476
	477	update-forwarders)
cd812106 MT	478	# Do not try updating forwarders when unbound is not running
	479	if ! pgrep unbound &>/dev/null; then
	480	exit 0
	481	fi
	482
b8f5eda8 MT	483	update_forwarders
b8f5eda8 MT	484	;;
d0e5f71f	485
b29c97b1 AF	486	test-name-server)
	487	ns=${2}
	488
	489	test_name_server ${ns}
	490	ret=${?}
	491
	492	case "${ret}" in
	493	0)
	494	echo "${ns} is validating"
	495	;;
	496	2)
	497	echo "${ns} is DNSSEC-aware"
	498	;;
	499	3)
	500	echo "${ns} is NOT DNSSEC-aware"
	501	;;
	502	*)
	503	echo "Test failed for an unknown reason"
8f3034d0	504	exit ${ret}
b29c97b1 AF	505	;;
	506	esac
	507
	508	if ns_supports_tcp ${ns}; then
	509	echo "${ns} supports TCP fallback"
	510	else
	511	echo "${ns} does not support TCP fallback"
	512	fi
	513
8f3034d0 MT	514	edns_buffer_size=$(ns_determine_edns_buffer_size ${ns})
	515	if [ -n "${edns_buffer_size}" ]; then
	516	echo "EDNS buffer size for ${ns}: ${edns_buffer_size}"
	517	fi
	518
b29c97b1 AF	519	exit ${ret}
	520	;;
	521
d0e5f71f	522	*)
b29c97b1	523	echo "Usage: $0 {start\|stop\|restart\|status\|update-forwarders\|test-name-server}"
b8f5eda8 MT	524	exit 1
b8f5eda8 MT	525	;;
d0e5f71f ML	526	esac
	527
	528	# End $rc_base/init.d/unbound