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 ${hostname}"
175 local enabled address hostname domainname generateptr
177 while IFS
="," read -r enabled address hostname domainname generateptr
; do
178 [ "${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}" = "${GREEN_ADDRESS}" ] && continue
188 # Skip reverse resolution if user requested not to do so
189 [ "${generateptr}" = "off" ] && continue
192 address
=$
(ip_address_revptr
${address})
193 unbound-control
-q local_data
"${address} ${LOCAL_TTL} IN PTR ${fqdn}"
194 done < /var
/ipfire
/main
/hosts
197 write_forward_conf
() {
201 local insecure_zones
="${INSECURE_ZONES}"
203 local enabled zone server servers remark disable_dnssec rest
204 while IFS
="," read -r enabled zone servers remark disable_dnssec rest
; do
205 # Line must be enabled.
206 [ "${enabled}" = "on" ] ||
continue
208 # Zones that end with .local are commonly used for internal
209 # zones and therefore not signed
212 insecure_zones
="${insecure_zones} ${zone}"
215 if [ "${disable_dnssec}" = "on" ]; then
216 insecure_zones
="${insecure_zones} ${zone}"
221 # Reverse-lookup zones must be stubs
225 echo " name: ${zone}"
226 for server
in ${servers//|/ }; do
227 if [[ ${server} =~ ^
[0-9]+\.
[0-9]+\.
[0-9]+\.
[0-9]+$
]]; then
228 echo " stub-addr: ${server}"
230 echo " stub-host: ${server}"
235 echo " local-zone: \"${zone}\" transparent"
240 echo " name: ${zone}"
241 for server
in ${servers//|/ }; do
242 if [[ ${server} =~ ^
[0-9]+\.
[0-9]+\.
[0-9]+\.
[0-9]+$
]]; then
243 echo " forward-addr: ${server}"
245 echo " forward-host: ${server}"
251 done < /var
/ipfire
/dnsforward
/config
253 if [ -n "${insecure_zones}" ]; then
256 for zone
in ${insecure_zones}; do
257 echo " domain-insecure: ${zone}"
260 ) > /etc
/unbound
/forward.conf
263 write_tuning_conf
() {
264 # https://www.unbound.net/documentation/howto_optimise.html
266 # Determine number of online processors
267 local processors
=$
(getconf _NPROCESSORS_ONLN
)
269 # Determine number of slabs
271 while [ ${slabs} -lt ${processors} ]; do
272 slabs
=$
(( ${slabs} * 2 ))
275 # Determine amount of system memory
276 local mem
=$
(get_memory_amount
)
278 # In the worst case scenario, unbound can use double the
279 # amount of memory allocated to a cache due to malloc overhead
281 # Even larger systems with more than 8GB of RAM
282 if [ ${mem} -ge 8192 ]; then
285 # Extra large systems with more than 4GB of RAM
286 elif [ ${mem} -ge 4096 ]; then
289 # Large systems with more than 2GB of RAM
290 elif [ ${mem} -ge 2048 ]; then
293 # Medium systems with more than 1GB of RAM
294 elif [ ${mem} -ge 1024 ]; then
297 # Small systems with less than 256MB of RAM
298 elif [ ${mem} -le 256 ]; then
309 # We run one thread per processor
310 echo "num-threads: ${processors}"
311 echo "so-reuseport: yes"
313 # Adjust number of slabs
314 echo "infra-cache-slabs: ${slabs}"
315 echo "key-cache-slabs: ${slabs}"
316 echo "msg-cache-slabs: ${slabs}"
317 echo "rrset-cache-slabs: ${slabs}"
320 echo "rrset-cache-size: $(( ${mem} / 2 ))m"
321 echo "msg-cache-size: $(( ${mem} / 4 ))m"
322 echo "key-cache-size: $(( ${mem} / 4 ))m"
324 # Increase parallel queries
325 echo "outgoing-range: 8192"
326 echo "num-queries-per-thread: 4096"
328 # Use larger send/receive buffers
331 ) > /etc
/unbound
/tuning.conf
334 get_memory_amount
() {
337 while read -r key val unit
; do
341 echo "$(( ${val} / 1024 ))"
353 # 0 DNSSEC validating
354 # 1 Error: unreachable, etc.
358 # Exit when the server is not reachable
359 ns_is_online
${ns} ||
return 1
361 # Determine the maximum edns buffer size that works
362 local edns_buffer_size
=$
(ns_determine_edns_buffer_size
${ns})
363 if [ -n "${edns_buffer_size}" ]; then
364 args
="${args} +bufsize=${edns_buffer_size}"
368 for rr
in DNSKEY DS RRSIG
; do
369 if ! ns_forwards_
${rr} ${ns} ${args}; then
370 errors
="${errors} ${rr}"
374 if [ -n "${errors}" ]; then
375 echo >&2 "Unable to retrieve the following resource records from ${ns}: ${errors:1}"
379 if ns_is_validating
${ns} ${args}; then
380 # Return 0 if validating
388 # Sends an A query to the nameserver w/o DNSSEC
393 dig @
${ns} +nodnssec A
${TEST_DOMAIN} $@
>/dev
/null
396 # Resolving ${TEST_DOMAIN_FAIL} will fail if the nameserver is validating
401 if ! dig @
${ns} A
${TEST_DOMAIN_FAIL} $@ |
grep -q SERVFAIL
; then
404 # Determine if NS replies with "ad" data flag if DNSSEC enabled
405 dig @
${ns} +dnssec SOA ${TEST_DOMAIN} $@ | awk -F: '/\;\;\ flags\:/ { s=1; if (/\ ad/) s=0; exit s }'
409 # Checks if we can retrieve the DNSKEY for this domain.
410 # dig will print the SOA if nothing was found
411 ns_forwards_DNSKEY() {
415 dig @${ns} DNSKEY ${TEST_DOMAIN} $@ | grep -qv SOA
422 dig @${ns} DS ${TEST_DOMAIN} $@ | grep -qv SOA
425 ns_forwards_RRSIG() {
429 dig @${ns} +dnssec A ${TEST_DOMAIN} $@ | grep -q RRSIG
436 dig @${ns} +tcp A ${TEST_DOMAIN} $@ >/dev/null || return 1
439 ns_determine_edns_buffer_size() {
444 for b in 4096 2048 1500 1480 1464 1400 1280 512; do
445 if dig @${ns} +dnssec +bufsize=${b} A ${TEST_DOMAIN} $@ >/dev/null; then
454 get_root_nameservers() {
455 while read -r hostname ttl record address; do
456 # Searching for A records
457 [ "${record}" = "A" ] || continue
460 done < /etc/unbound/root.hints
465 for ns in $(get_root_nameservers); do
466 if dig @${ns} +dnssec SOA . $@ >/dev/null; then
471 # none of the servers was reachable
476 local status=$(unbound-control get_option val-permissive-mode)
479 echo "on" > /var/ipfire/red/dnssec-status
481 # Don't
do anything
if DNSSEC is already activated
482 [ "${status}" = "no" ] && return 0
484 # Activate DNSSEC and flush cache with any stale and unvalidated data
485 unbound-control
-q set_option val-permissive-mode
: no
486 unbound-control
-q flush_zone .
491 echo "off" > /var
/ipfire
/red
/dnssec-status
493 unbound-control
-q set_option val-permissive-mode
: yes
496 fix_time_if_dns_fail
() {
497 # If DNS still not work try to init ntp with
498 # hardcoded ntp.ipfire.org (81.3.27.46)
499 if [ -e /var
/ipfire
/red
/active
]; then
500 host 0.ipfire.pool.ntp.org
> /dev
/null
2>&1
501 if [ "${?}" != "0" ]; then
502 boot_mesg
"DNS still not functioning... Trying to sync time with ntp.ipfire.org (81.3.27.46)..."
503 loadproc
/usr
/local
/bin
/settime
81.3.27.46
510 # Print a nicer messagen when unbound is already running
511 if pidofproc
-s unbound
; then
512 statusproc
/usr
/sbin
/unbound
516 eval $
(/usr
/local
/bin
/readhash
/var
/ipfire
/ethernet
/settings
)
518 # Update configuration files
522 boot_mesg
"Starting Unbound DNS Proxy..."
523 loadproc
/usr
/sbin
/unbound ||
exit $?
525 # Make own hostname resolveable
528 # Update any known forwarding name servers
538 boot_mesg
"Stopping Unbound DNS Proxy..."
539 killproc
/usr
/sbin
/unbound
549 statusproc
/usr
/sbin
/unbound
553 # Do not try updating forwarders when unbound is not running
554 if ! pgrep unbound
&>/dev
/null
; then
560 unbound-control flush_negative
> /dev
/null
561 unbound-control flush_bogus
> /dev
/null
569 test_name_server
${ns}
574 echo "${ns} is validating"
577 echo "${ns} is DNSSEC-aware"
580 echo "${ns} is NOT DNSSEC-aware"
583 echo "Test failed for an unknown reason"
588 if ns_supports_tcp
${ns}; then
589 echo "${ns} supports TCP fallback"
591 echo "${ns} does not support TCP fallback"
594 edns_buffer_size
=$
(ns_determine_edns_buffer_size
${ns})
595 if [ -n "${edns_buffer_size}" ]; then
596 echo "EDNS buffer size for ${ns}: ${edns_buffer_size}"
603 echo "Usage: $0 {start|stop|restart|status|update-forwarders|test-name-server}"
608 # End $rc_base/init.d/unbound