2 # Begin $rc_base/init.d/unbound
4 # Description : Unbound DNS resolver boot script for IPfire
5 # Author : Marcel Lorenz <marcel.lorenz@ipfire.org>
10 TEST_DOMAIN
="ipfire.org"
12 # This domain will never validate
13 TEST_DOMAIN_FAIL
="dnssec-failed.org"
18 # Cache any local zones for 60 seconds
22 EDNS_DEFAULT_BUFFER_SIZE
=4096
24 # Load optional configuration
25 [ -e "/etc/sysconfig/unbound" ] && .
/etc
/sysconfig
/unbound
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))")
45 *) echo "Error: $dec is not recognised"; exit 1
48 echo "${cidr}/${nbits}"
55 IFS
=.
read -r a1 a2 a3 a4
<<< ${addr}
57 echo "${a4}.${a3}.${a2}.${a1}.in-addr.arpa"
63 echo "$(</var/ipfire/red/dns${i})"
64 done 2>/dev
/null |
xargs echo
68 echo "# This file is automatically generated and any changes"
69 echo "# will be overwritten. DO NOT EDIT!"
74 if [ "${USE_FORWARDERS}" = "1" -a -e "/var/ipfire/red/active" ]; then
76 local broken_forwarders
79 for ns
in $
(read_name_servers
); do
80 test_name_server
${ns} &>/dev
/null
82 # Only use DNSSEC-validating or DNSSEC-aware name servers
84 forwarders
="${forwarders} ${ns}"
87 broken_forwarders
="${broken_forwarders} ${ns}"
92 # Determine EDNS buffer size
93 local new_edns_buffer_size
=${EDNS_DEFAULT_BUFFER_SIZE}
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}
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}
108 unbound-control
-q set_option edns-buffer-size
: ${new_edns_buffer_size}
111 # Show warning for any broken upstream name servers
112 if [ -n "${broken_forwarders}" ]; then
113 boot_mesg
"Ignoring broken upstream name server(s): ${broken_forwarders:1}" ${WARNING}
117 if [ -n "${forwarders}" ]; then
118 boot_mesg
"Configuring upstream name server(s): ${forwarders:1}" ${INFO}
121 # Make sure DNSSEC is activated
124 echo "${forwarders}" > /var
/ipfire
/red
/dns
125 unbound-control
-q forward
${forwarders}
128 # In case we have found no working forwarders
130 # Test if the recursor mode is available
131 if can_resolve_root
+bufsize
=${new_edns_buffer_size}; then
132 # Make sure DNSSEC is activated
135 boot_mesg
"Falling back to recursor mode" ${WARNING}
138 # If not, we set DNSSEC in permissive mode and allow using all recursors
139 elif [ -n "${broken_forwarders}" ]; then
142 boot_mesg
"DNSSEC has been set to permissive mode" ${FAILURE}
145 echo "${broken_forwarders}" > /var
/ipfire
/red
/dns
146 unbound-control
-q forward
${broken_forwarders}
152 # If forwarders cannot be used we run in recursor mode
153 echo "local recursor" > /var
/ipfire
/red
/dns
154 unbound-control
-q forward off
158 local hostname
=$
(hostname
-f)
159 # 1.1.1.1 is reserved for unused green, skip this
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}"
165 for address
in ${GREEN_ADDRESS} ${BLUE_ADDRESS} ${ORANGE_ADDRESS}; do
166 [ -n "${address}" ] ||
continue
167 [ "${address}" = "1.1.1.1" ] && continue
169 address
=$
(ip_address_revptr
${address})
170 unbound-control
-q local_data
"${address} ${LOCAL_TTL} IN PTR ${hostname}"
175 local enabled address hostname domainname
177 while IFS
="," read -r enabled address hostname domainname
; do
178 [ "${enabled}" = "on" ] ||
continue
181 local fqdn
="${hostname}.${domainname}"
183 unbound-control
-q local_data
"${fqdn} ${LOCAL_TTL} IN A ${address}"
185 # Skip reverse resolution if the address equals the GREEN address
186 [ "${address}" = "${GREEN_ADDRESS}" ] && continue
189 address
=$
(ip_address_revptr
${address})
190 unbound-control
-q local_data
"${address} ${LOCAL_TTL} IN PTR ${fqdn}"
191 done < /var
/ipfire
/main
/hosts
194 write_forward_conf
() {
198 local insecure_zones
="${INSECURE_ZONES}"
200 local enabled zone server servers remark disable_dnssec rest
201 while IFS
="," read -r enabled zone servers remark disable_dnssec rest
; do
202 # Line must be enabled.
203 [ "${enabled}" = "on" ] ||
continue
205 # Zones that end with .local are commonly used for internal
206 # zones and therefore not signed
209 insecure_zones
="${insecure_zones} ${zone}"
212 if [ "${disable_dnssec}" = "on" ]; then
213 insecure_zones
="${insecure_zones} ${zone}"
218 # Reverse-lookup zones must be stubs
222 echo " name: ${zone}"
223 for server
in ${servers//|/ }; do
224 if [[ ${server} =~ ^
[0-9]+\.
[0-9]+\.
[0-9]+\.
[0-9]+$
]]; then
225 echo " stub-addr: ${server}"
227 echo " stub-host: ${server}"
232 echo " local-zone: \"${zone}\" transparent"
237 echo " name: ${zone}"
238 for server
in ${servers//|/ }; do
239 if [[ ${server} =~ ^
[0-9]+\.
[0-9]+\.
[0-9]+\.
[0-9]+$
]]; then
240 echo " forward-addr: ${server}"
242 echo " forward-host: ${server}"
248 done < /var
/ipfire
/dnsforward
/config
250 if [ -n "${insecure_zones}" ]; then
253 for zone
in ${insecure_zones}; do
254 echo " domain-insecure: ${zone}"
257 ) > /etc
/unbound
/forward.conf
260 write_tuning_conf
() {
261 # https://www.unbound.net/documentation/howto_optimise.html
263 # Determine number of online processors
264 local processors
=$
(getconf _NPROCESSORS_ONLN
)
266 # Determine number of slabs
268 while [ ${slabs} -lt ${processors} ]; do
269 slabs
=$
(( ${slabs} * 2 ))
272 # Determine amount of system memory
273 local mem
=$
(get_memory_amount
)
275 # In the worst case scenario, unbound can use double the
276 # amount of memory allocated to a cache due to malloc overhead
278 # Even larger systems with more than 8GB of RAM
279 if [ ${mem} -ge 8192 ]; then
282 # Extra large systems with more than 4GB of RAM
283 elif [ ${mem} -ge 4096 ]; then
286 # Large systems with more than 2GB of RAM
287 elif [ ${mem} -ge 2048 ]; then
290 # Medium systems with more than 1GB of RAM
291 elif [ ${mem} -ge 1024 ]; then
294 # Small systems with less than 256MB of RAM
295 elif [ ${mem} -le 256 ]; then
306 # We run one thread per processor
307 echo "num-threads: ${processors}"
308 echo "so-reuseport: yes"
310 # Adjust number of slabs
311 echo "infra-cache-slabs: ${slabs}"
312 echo "key-cache-slabs: ${slabs}"
313 echo "msg-cache-slabs: ${slabs}"
314 echo "rrset-cache-slabs: ${slabs}"
317 echo "rrset-cache-size: $(( ${mem} / 2 ))m"
318 echo "msg-cache-size: $(( ${mem} / 4 ))m"
319 echo "key-cache-size: $(( ${mem} / 4 ))m"
321 # Increase parallel queries
322 echo "outgoing-range: 8192"
323 echo "num-queries-per-thread: 4096"
325 # Use larger send/receive buffers
328 ) > /etc
/unbound
/tuning.conf
331 get_memory_amount
() {
334 while read -r key val unit
; do
338 echo "$(( ${val} / 1024 ))"
350 # 0 DNSSEC validating
351 # 1 Error: unreachable, etc.
355 # Exit when the server is not reachable
356 ns_is_online
${ns} ||
return 1
358 # Determine the maximum edns buffer size that works
359 local edns_buffer_size
=$
(ns_determine_edns_buffer_size
${ns})
360 if [ -n "${edns_buffer_size}" ]; then
361 args
="${args} +bufsize=${edns_buffer_size}"
365 for rr
in DNSKEY DS RRSIG
; do
366 if ! ns_forwards_
${rr} ${ns} ${args}; then
367 errors
="${errors} ${rr}"
371 if [ -n "${errors}" ]; then
372 echo >&2 "Unable to retrieve the following resource records from ${ns}: ${errors:1}"
376 if ns_is_validating
${ns} ${args}; then
377 # Return 0 if validating
385 # Sends an A query to the nameserver w/o DNSSEC
390 dig @
${ns} +nodnssec A
${TEST_DOMAIN} $@
>/dev
/null
393 # Resolving ${TEST_DOMAIN_FAIL} will fail if the nameserver is validating
398 if ! dig @
${ns} A
${TEST_DOMAIN_FAIL} $@ |
grep -q SERVFAIL
; then
401 # Determine if NS replies with "ad" data flag if DNSSEC enabled
402 dig @
${ns} +dnssec SOA ${TEST_DOMAIN} $@ | awk -F: '/\;\;\ flags\:/ { s=1; if (/\ ad/) s=0; exit s }'
406 # Checks if we can retrieve the DNSKEY for this domain.
407 # dig will print the SOA if nothing was found
408 ns_forwards_DNSKEY() {
412 dig @${ns} DNSKEY ${TEST_DOMAIN} $@ | grep -qv SOA
419 dig @${ns} DS ${TEST_DOMAIN} $@ | grep -qv SOA
422 ns_forwards_RRSIG() {
426 dig @${ns} +dnssec A ${TEST_DOMAIN} $@ | grep -q RRSIG
433 dig @${ns} +tcp A ${TEST_DOMAIN} $@ >/dev/null || return 1
436 ns_determine_edns_buffer_size() {
441 for b in 4096 2048 1500 1480 1464 1400 1280 512; do
442 if dig @${ns} +dnssec +bufsize=${b} A ${TEST_DOMAIN} $@ >/dev/null; then
451 get_root_nameservers() {
452 while read -r hostname ttl record address; do
453 # Searching for A records
454 [ "${record}" = "A" ] || continue
457 done < /etc/unbound/root.hints
462 for ns in $(get_root_nameservers); do
463 if dig @${ns} +dnssec SOA . $@ >/dev/null; then
468 # none of the servers was reachable
473 local status=$(unbound-control get_option val-permissive-mode)
476 echo "on" > /var/ipfire/red/dnssec-status
478 # Don't
do anything
if DNSSEC is already activated
479 [ "${status}" = "no" ] && return 0
481 # Activate DNSSEC and flush cache with any stale and unvalidated data
482 unbound-control
-q set_option val-permissive-mode
: no
483 unbound-control
-q flush_zone .
488 echo "off" > /var
/ipfire
/red
/dnssec-status
490 unbound-control
-q set_option val-permissive-mode
: yes
493 fix_time_if_dns_fail
() {
494 # If DNS still not work try to init ntp with
495 # hardcoded ntp.ipfire.org (81.3.27.46)
496 if [ -e /var
/ipfire
/red
/active
]; then
497 host 0.ipfire.pool.ntp.org
> /dev
/null
2>&1
498 if [ "${?}" != "0" ]; then
499 boot_mesg
"DNS still not functioning... Trying to sync time with ntp.ipfire.org (81.3.27.46)..."
500 loadproc
/usr
/local
/bin
/settime
81.3.27.46
507 # Print a nicer messagen when unbound is already running
508 if pidofproc
-s unbound
; then
509 statusproc
/usr
/sbin
/unbound
513 eval $
(/usr
/local
/bin
/readhash
/var
/ipfire
/ethernet
/settings
)
515 # Update configuration files
519 boot_mesg
"Starting Unbound DNS Proxy..."
520 loadproc
/usr
/sbin
/unbound ||
exit $?
522 # Make own hostname resolveable
525 # Update any known forwarding name servers
535 boot_mesg
"Stopping Unbound DNS Proxy..."
536 killproc
/usr
/sbin
/unbound
546 statusproc
/usr
/sbin
/unbound
550 # Do not try updating forwarders when unbound is not running
551 if ! pgrep unbound
&>/dev
/null
; then
557 unbound-control flush_negative
> /dev
/null
558 unbound-control flush_bogus
> /dev
/null
566 test_name_server
${ns}
571 echo "${ns} is validating"
574 echo "${ns} is DNSSEC-aware"
577 echo "${ns} is NOT DNSSEC-aware"
580 echo "Test failed for an unknown reason"
585 if ns_supports_tcp
${ns}; then
586 echo "${ns} supports TCP fallback"
588 echo "${ns} does not support TCP fallback"
591 edns_buffer_size
=$
(ns_determine_edns_buffer_size
${ns})
592 if [ -n "${edns_buffer_size}" ]; then
593 echo "EDNS buffer size for ${ns}: ${edns_buffer_size}"
600 echo "Usage: $0 {start|stop|restart|status|update-forwarders|test-name-server}"
605 # End $rc_base/init.d/unbound