src/initscripts/init.d/unbound

   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>
   6
   7 . /etc/sysconfig/rc
   8 . ${rc_functions}
   9
  10 TEST_DOMAIN="ipfire.org"
  11
  12 # This domain will never validate
  13 TEST_DOMAIN_FAIL="dnssec-failed.org"
  14
  15 INSECURE_ZONES=
  16 USE_FORWARDERS=1
  17
  18 # Cache any local zones for 60 seconds
  19 LOCAL_TTL=60
  20
  21 # Load optional configuration
  22 [ -e "/etc/sysconfig/unbound" ] && . /etc/sysconfig/unbound
  23
  24 function cidr() {
  25     local cidr nbits IFS;
  26     IFS=. read -r i1 i2 i3 i4 <<< ${1}
  27     IFS=. read -r m1 m2 m3 m4 <<< ${2}
  28     cidr=$(printf "%d.%d.%d.%d\n" "$((i1 & m1))" "$((i2 & m2))" "$((i3 & m3))" "$((i4 & m4))")
  29     nbits=0
  30     IFS=.
  31     for dec in $2 ; do
  32         case $dec in
  33             255) let nbits+=8;;
  34             254) let nbits+=7;;
  35             252) let nbits+=6;;
  36             248) let nbits+=5;;
  37             240) let nbits+=4;;
  38             224) let nbits+=3;;
  39             192) let nbits+=2;;
  40             128) let nbits+=1;;
  41             0);;
  42             *) echo "Error: $dec is not recognised"; exit 1
  43         esac
  44     done
  45     echo "${cidr}/${nbits}"
  46 }
  47
  48 ip_address_revptr() {
  49         local addr=${1}
  50
  51         local a1 a2 a3 a4
  52         IFS=. read -r a1 a2 a3 a4 <<< ${addr}
  53
  54         echo "${a4}.${a3}.${a2}.${a1}.in-addr.arpa"
  55 }
  56
  57 read_name_servers() {
  58         local i
  59         for i in 1 2; do
  60                 echo "$(</var/ipfire/red/dns${i})"
  61         done | xargs echo
  62 }
  63
  64 config_header() {
  65         echo "# This file is automatically generated and any changes"
  66         echo "# will be overwritten. DO NOT EDIT!"
  67         echo
  68 }
  69
  70 update_forwarders() {
  71         if [ "${USE_FORWARDERS}" = "1" -a -e "/var/ipfire/red/active" ]; then
  72                 local forwarders
  73                 local broken_forwarders
  74
  75                 local ns
  76                 for ns in $(read_name_servers); do
  77                         test_name_server ${ns} &>/dev/null
  78                         case "$?" in
  79                                 # Only use DNSSEC-validating or DNSSEC-aware name servers
  80                                 0|2)
  81                                         forwarders="${forwarders} ${ns}"
  82                                         ;;
  83                                 *)
  84                                         broken_forwarders="${broken_forwarders} ${ns}"
  85                                         ;;
  86                         esac
  87                 done
  88
  89                 # Show warning for any broken upstream name servers
  90                 if [ -n "${broken_forwarders}" ]; then
  91                         boot_mesg "Ignoring broken upstream name server(s): ${broken_forwarders:1}" ${WARNING}
  92                         echo_warning
  93                 fi
  94
  95                 if [ -n "${broken_forwarders}" -a -z "${forwarders}" ]; then
  96                         boot_mesg "Falling back to recursor mode" ${WARNING}
  97                         echo_warning
  98
  99                 elif [ -n "${forwarders}" ]; then
 100                         boot_mesg "Configuring upstream name server(s): ${forwarders:1}" ${INFO}
 101                         echo_ok
 102
 103                         echo "${forwarders}" > /var/ipfire/red/dns
 104                         unbound-control -q forward ${forwarders}
 105                         return 0
 106                 fi
 107         fi
 108
 109         # If forwarders cannot be used we run in recursor mode
 110         echo "local recursor" > /var/ipfire/red/dns
 111         unbound-control -q forward off
 112 }
 113
 114 own_hostname() {
 115         local hostname=$(hostname -f)
 116         # 1.1.1.1 is reserved for unused green, skip this
 117         if [ -n "${GREEN_ADDRESS}" -a "${GREEN_ADDRESS}" != "1.1.1.1" ]; then
 118                 unbound-control -q local_data "${hostname} ${LOCAL_TTL} IN A ${GREEN_ADDRESS}"
 119         fi
 120
 121         local address
 122         for address in ${GREEN_ADDRESS} ${BLUE_ADDRESS} ${ORANGE_ADDRESS}; do
 123                 [ -n "${address}" ] || continue
 124                 [ "${address}" = "1.1.1.1" ] && continue
 125
 126                 address=$(ip_address_revptr ${address})
 127                 unbound-control -q local_data "${address} ${LOCAL_TTL} IN PTR ${hostname}"
 128         done
 129 }
 130
 131 update_hosts() {
 132         local enabled address hostname domainname
 133
 134         while IFS="," read -r enabled address hostname domainname; do
 135                 [ "${enabled}" = "on" ] || continue
 136
 137                 # Build FQDN
 138                 local fqdn="${hostname}.${domainname}"
 139
 140                 unbound-control -q local_data "${fqdn} ${LOCAL_TTL} IN A ${address}"
 141
 142                 # Skip reverse resolution if the address equals the GREEN address
 143                 [ "${address}" = "${GREEN_ADDRESS}" ] && continue
 144
 145                 # Add RDNS
 146                 address=$(ip_address_revptr ${address})
 147                 unbound-control -q local_data "${address} ${LOCAL_TTL} IN PTR ${fqdn}"
 148         done < /var/ipfire/main/hosts
 149 }
 150
 151 write_forward_conf() {
 152         (
 153                 config_header
 154
 155                 local insecure_zones="${INSECURE_ZONES}"
 156
 157                 local enabled zone server remark
 158                 while IFS="," read -r enabled zone server remark; do
 159                         # Line must be enabled.
 160                         [ "${enabled}" = "on" ] || continue
 161
 162                         # Zones that end with .local are commonly used for internal
 163                         # zones and therefore not signed
 164                         case "${zone}" in
 165                                 *.local)
 166                                         insecure_zones="${insecure_zones} ${zone}"
 167                                         ;;
 168                         esac
 169
 170                         echo "forward-zone:"
 171                         echo "  name: ${zone}"
 172                         echo "  forward-addr: ${server}"
 173                         echo
 174                 done < /var/ipfire/dnsforward/config
 175
 176                 if [ -n "${insecure_zones}" ]; then
 177                         echo "server:"
 178
 179                         for zone in ${insecure_zones}; do
 180                                 echo "  domain-insecure: ${zone}"
 181                         done
 182                 fi
 183         ) > /etc/unbound/forward.conf
 184 }
 185
 186 write_tuning_conf() {
 187         # https://www.unbound.net/documentation/howto_optimise.html
 188
 189         # Determine number of online processors
 190         local processors=$(getconf _NPROCESSORS_ONLN)
 191
 192         # Determine number of slabs
 193         local slabs=1
 194         while [ ${slabs} -lt ${processors} ]; do
 195                 slabs=$(( ${slabs} * 2 ))
 196         done
 197
 198         # Determine amount of system memory
 199         local mem=$(get_memory_amount)
 200
 201         # In the worst case scenario, unbound can use double the
 202         # amount of memory allocated to a cache due to malloc overhead
 203
 204         # Large systems with more than 2GB of RAM
 205         if [ ${mem} -ge 2048 ]; then
 206                 mem=128
 207
 208         # Small systems with less than 256MB of RAM
 209         elif [ ${mem} -le 256 ]; then
 210                 mem=8
 211
 212         # Everything else
 213         else
 214                 mem=32
 215         fi
 216
 217         (
 218                 config_header
 219
 220                 # We run one thread per processor
 221                 echo "num-threads: ${processors}"
 222
 223                 # Adjust number of slabs
 224                 echo "infra-cache-slabs: ${slabs}"
 225                 echo "key-cache-slabs: ${slabs}"
 226                 echo "msg-cache-slabs: ${slabs}"
 227                 echo "rrset-cache-slabs: ${slabs}"
 228
 229                 # Slice up the cache
 230                 echo "rrset-cache-size: $(( ${mem} / 2 ))m"
 231                 echo "msg-cache-size: $(( ${mem} / 4 ))m"
 232                 echo "key-cache-size: $(( ${mem} / 4 ))m"
 233         ) > /etc/unbound/tuning.conf
 234 }
 235
 236 get_memory_amount() {
 237         local key val unit
 238
 239         while read -r key val unit; do
 240                 case "${key}" in
 241                         MemTotal:*)
 242                                 # Convert to MB
 243                                 echo "$(( ${val} / 1024 ))"
 244                                 break
 245                                 ;;
 246                 esac
 247         done < /proc/meminfo
 248 }
 249
 250 test_name_server() {
 251         local ns=${1}
 252
 253         # Return codes:
 254         # 0     DNSSEC validating
 255         # 1     Error: unreachable, etc.
 256         # 2     DNSSEC aware
 257         # 3     NOT DNSSEC-aware
 258
 259         # Exit when the server is not reachable
 260         ns_is_online ${ns} || return 1
 261
 262         # Return 0 if validating
 263         ns_is_validating ${ns} && return 0
 264
 265         local errors
 266         for rr in DNSKEY DS RRSIG; do
 267                 if ! ns_forwards_${rr} ${ns}; then
 268                         errors="${errors} ${rr}"
 269                 fi
 270         done
 271
 272         if [ -n "${errors}" ]; then
 273                 echo >&2 "Unable to retrieve the following resource records from ${ns}: ${errors:1}"
 274                 return 3
 275         fi
 276
 277         # Is DNSSEC-aware
 278         return 2
 279 }
 280
 281 # Sends an A query to the nameserver w/o DNSSEC
 282 ns_is_online() {
 283         local ns=${1}
 284
 285         dig @${ns} +nodnssec A ${TEST_DOMAIN} >/dev/null
 286 }
 287
 288 # Resolving ${TEST_DOMAIN_FAIL} will fail if the nameserver is validating
 289 ns_is_validating() {
 290         local ns=${1}
 291
 292         dig @${ns} A ${TEST_DOMAIN_FAIL} | grep -q SERVFAIL
 293 }
 294
 295 # Checks if we can retrieve the DNSKEY for this domain.
 296 # dig will print the SOA if nothing was found
 297 ns_forwards_DNSKEY() {
 298         local ns=${1}
 299
 300         dig @${ns} DNSKEY ${TEST_DOMAIN} | grep -qv SOA
 301 }
 302
 303 ns_forwards_DS() {
 304         local ns=${1}
 305
 306         dig @${ns} DS ${TEST_DOMAIN} | grep -qv SOA
 307 }
 308
 309 ns_forwards_RRSIG() {
 310         local ns=${1}
 311
 312         dig @${ns} +dnssec A ${TEST_DOMAIN} | grep -q RRSIG
 313 }
 314
 315 ns_supports_tcp() {
 316         local ns=${1}
 317
 318         dig @${ns} +tcp A ${TEST_DOMAIN} >/dev/null || return 1
 319 }
 320
 321 case "$1" in
 322         start)
 323                 # Print a nicer messagen when unbound is already running
 324                 if pidofproc -s unbound; then
 325                         statusproc /usr/sbin/unbound
 326                         exit 0
 327                 fi
 328
 329                 eval $(/usr/local/bin/readhash /var/ipfire/ethernet/settings)
 330
 331                 # Create control keys at first run
 332                 if [ ! -r "/etc/unbound/unbound_control.key" ]; then
 333                         unbound-control-setup -d /etc/unbound &>/dev/null
 334                 fi
 335
 336                 # Update configuration files
 337                 write_tuning_conf
 338                 write_forward_conf
 339
 340                 boot_mesg "Starting Unbound DNS Proxy..."
 341                 loadproc /usr/sbin/unbound || exit $?
 342
 343                 # Make own hostname resolveable
 344                 own_hostname
 345
 346                 # Update any known forwarding name servers
 347                 update_forwarders
 348
 349                 # Update hosts
 350                 update_hosts
 351                 ;;
 352
 353         stop)
 354                 boot_mesg "Stopping Unbound DNS Proxy..."
 355                 killproc /usr/sbin/unbound
 356                 ;;
 357
 358         restart)
 359                 $0 stop
 360                 sleep 1
 361                 $0 start
 362                 ;;
 363
 364         status)
 365                 statusproc /usr/sbin/unbound
 366                 ;;
 367
 368         update-forwarders)
 369                 update_forwarders
 370                 ;;
 371
 372         test-name-server)
 373                 ns=${2}
 374
 375                 test_name_server ${ns}
 376                 ret=${?}
 377
 378                 case "${ret}" in
 379                         0)
 380                                 echo "${ns} is validating"
 381                                 ;;
 382                         2)
 383                                 echo "${ns} is DNSSEC-aware"
 384                                 ;;
 385                         3)
 386                                 echo "${ns} is NOT DNSSEC-aware"
 387                                 ;;
 388                         *)
 389                                 echo "Test failed for an unknown reason"
 390                                 ;;
 391                 esac
 392
 393                 if ns_supports_tcp ${ns}; then
 394                         echo "${ns} supports TCP fallback"
 395                 else
 396                         echo "${ns} does not support TCP fallback"
 397                 fi
 398
 399                 exit ${ret}
 400                 ;;
 401
 402         *)
 403                 echo "Usage: $0 {start|stop|restart|status|update-forwarders|test-name-server}"
 404                 exit 1
 405                 ;;
 406 esac
 407
 408 # End $rc_base/init.d/unbound