net/unbound/files/dnsmasq.sh

   1 #!/bin/sh
   2 ##############################################################################
   3 #
   4 # This program is free software; you can redistribute it and/or modify
   5 # it under the terms of the GNU General Public License version 2 as
   6 # published by the Free Software Foundation.
   7 #
   8 # This program is distributed in the hope that it will be useful,
   9 # but WITHOUT ANY WARRANTY; without even the implied warranty of
  10 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  11 # GNU General Public License for more details.
  12 #
  13 # Copyright (C) 2016 Eric Luehrsen
  14 #
  15 ##############################################################################
  16 #
  17 # This crosses over to the dnsmasq UCI file "dhcp" and parses it for fields
  18 # that will allow Unbound to request local host DNS of dnsmasq. We need to look
  19 # at the interfaces in "dhcp" and get their subnets. The Unbound conf syntax
  20 # makes this a little difficult. First in "server:" we need to create private
  21 # zones for the domain and PTR records. Then we need to create numerous
  22 # "forward:" clauses to forward those zones to dnsmasq.
  23 #
  24 ##############################################################################
  25
  26 # while useful (sh)ellcheck is pedantic and noisy
  27 # shellcheck disable=1091,2002,2004,2034,2039,2086,2094,2140,2154,2155
  28
  29 DM_D_WAN_FQDN=0
  30
  31 DM_LIST_KNOWN_ZONES="invalid"
  32 DM_LIST_TRN_ZONES=""
  33 DM_LIST_LOCAL_DATA=""
  34 DM_LIST_LOCAL_PTR=""
  35 DM_LIST_FWD_PORTS=""
  36 DM_LIST_FWD_ZONES=""
  37
  38 ##############################################################################
  39
  40 create_local_zone() {
  41   local target="$1"
  42   local partial domain found
  43
  44   case $DM_LIST_TRN_ZONES in
  45     *"${target}"*)
  46       found=1
  47       ;;
  48
  49     *)
  50       case $target in
  51         [A-Za-z0-9]*.[A-Za-z0-9]*)
  52           found=0
  53           ;;
  54
  55         *) # no dots
  56           found=1
  57           ;;
  58       esac
  59   esac
  60
  61
  62   if [ $found -eq 0 ] ; then
  63     # New Zone! Bundle local-zones: by first two name tiers "abcd.tld."
  64     partial=$( echo "$target" | awk -F. '{ j=NF ; i=j-1; print $i"."$j }' )
  65     DM_LIST_TRN_ZONES="$DM_LIST_TRN_ZONES $partial"
  66     DM_LIST_KNOWN_ZONES="$DM_LIST_KNOWN_ZONES $partial"
  67   fi
  68 }
  69
  70 ##############################################################################
  71
  72 create_host_record_from_domain() {
  73   local cfg="$1"
  74   local ip name debug_ip
  75
  76   # basefiles dhcp "domain" clause which means host A, AAAA, and PRT record
  77   config_get ip   "$cfg" ip
  78   config_get name "$cfg" name
  79
  80
  81   if [ -n "$name" ] && [ -n "$ip" ] ; then
  82     create_local_zone "$name"
  83
  84
  85     case $ip in
  86       fe[89ab][0-9a-f]:*|169.254.*)
  87         debug_ip="$ip@$name"
  88         ;;
  89
  90       [1-9a-f]*:*[0-9a-f])
  91         DM_LIST_LOCAL_DATA="$DM_LIST_LOCAL_DATA $name.@@300@@IN@@AAAA@@$ip"
  92         DM_LIST_LOCAL_PTR="$DM_LIST_LOCAL_PTR $ip@@300@@$name"
  93         ;;
  94
  95       [1-9]*.*[0-9])
  96         DM_LIST_LOCAL_DATA="$DM_LIST_LOCAL_DATA $name.@@300@@IN@@A@@$ip"
  97         DM_LIST_LOCAL_PTR="$DM_LIST_LOCAL_PTR $ip@@300@@$name"
  98         ;;
  99     esac
 100   fi
 101 }
 102
 103 ##############################################################################
 104
 105 create_host_record_from_host() {
 106   local cfg="$1"
 107   local dns ip name
 108
 109   # basefiles dhcp "host" clause which means host A and PTR records
 110   config_get dns  "$cfg" dns 0
 111   config_get ip   "$cfg" ip
 112   config_get name "$cfg" name
 113
 114
 115   if [ -n "$name" ] && [ -n "$ip" ] && [ $dns -eq 1 ] ; then
 116     case $name in
 117       *.*)
 118         # domain present, do nothing
 119         ;;
 120       *)
 121         name="$name.$UB_TXT_DOMAIN"
 122         ;;
 123     esac
 124
 125
 126     create_local_zone "$name"
 127     DM_LIST_LOCAL_DATA="$DM_LIST_LOCAL_DATA $name.@@300@@IN@@A@@$ip"
 128     DM_LIST_LOCAL_PTR="$DM_LIST_LOCAL_PTR $ip@@300@@$name"
 129   fi
 130 }
 131
 132 ##############################################################################
 133
 134 create_mx_record() {
 135   local cfg="$1"
 136   local domain relay pref record
 137
 138   # Insert a static MX record
 139   config_get domain "$cfg" domain
 140   config_get relay  "$cfg" relay
 141   config_get pref   "$cfg" pref 10
 142
 143
 144   if [ -n "$domain" ] && [ -n "$relay" ] ; then
 145     create_local_zone "$domain"
 146     record="$domain.@@300@@IN@@MX@@$pref@@$relay."
 147     DM_LIST_LOCAL_DATA="$DM_LIST_LOCAL_DATA $record"
 148   fi
 149 }
 150
 151 ##############################################################################
 152
 153 create_srv_record() {
 154   local cfg="$1"
 155   local srv target port class weight record
 156
 157   # Insert a static SRV record such as SIP server
 158   config_get srv    "$cfg" srv
 159   config_get target "$cfg" target
 160   config_get port   "$cfg" port
 161   config_get class  "$cfg" class 10
 162   config_get weight "$cfg" weight 10
 163
 164
 165   if [ -n "$srv" ] && [ -n "$target" ] && [ -n "$port" ] ; then
 166     create_local_zone "$srv"
 167     record="$srv.@@300@@IN@@SRV@@$class@@$weight@@$port@@$target."
 168     DM_LIST_LOCAL_DATA="$DM_LIST_LOCAL_DATA $record"
 169   fi
 170 }
 171
 172 ##############################################################################
 173
 174 create_cname_record() {
 175   local cfg="$1"
 176   local cname target record
 177
 178   # Insert static CNAME record
 179   config_get cname  "$cfg" cname
 180   config_get target "$cfg" target
 181
 182
 183   if [ -n "$cname" ] && [ -n "$target" ] ; then
 184     create_local_zone "$cname"
 185     record="$cname.@@300@@IN@@CNAME@@$target."
 186     DM_LIST_LOCAL_DATA="$DM_LIST_LOCAL_DATA $record"
 187   fi
 188 }
 189
 190 ##############################################################################
 191
 192 dnsmasq_local_zone() {
 193   local cfg="$1"
 194   local fwd_port fwd_domain wan_fqdn
 195
 196   # dnsmasq domain and interface assignment settings will control config
 197   config_get fwd_domain "$cfg" domain
 198   config_get fwd_port "$cfg" port
 199   config_get wan_fqdn "$cfg" add_wan_fqdn
 200
 201
 202   if [ -n "$wan_fqdn" ] ; then
 203     DM_D_WAN_FQDN=$wan_fqdn
 204   fi
 205
 206
 207   if [ -n "$fwd_domain" ] && [ -n "$fwd_port" ] \
 208   && [ ! ${fwd_port:-53} -eq 53 ] ; then
 209     # dnsmasq localhost listening ports (possible multiple instances)
 210     DM_LIST_FWD_PORTS="$DM_LIST_FWD_PORTS $fwd_port"
 211     DM_LIST_FWD_ZONES="$DM_LIST_FWD_ZONES $fwd_domain"
 212   fi
 213 }
 214
 215 ##############################################################################
 216
 217 dnsmasq_local_arpa() {
 218   local ifarpa ifsubnet
 219
 220
 221   if [ -n "$UB_LIST_NETW_LAN" ] ; then
 222     for ifsubnet in $UB_LIST_NETW_LAN ; do
 223       ifarpa=$( domain_ptr_any "${ifsubnet#*@}" )
 224       DM_LIST_FWD_ZONES="$DM_LIST_FWD_ZONES $ifarpa"
 225     done
 226   fi
 227
 228
 229   if [ -n "$UB_LIST_NETW_WAN" ] && [ $DM_D_WAN_FQDN -gt 0 ] ; then
 230     for ifsubnet in $UB_LIST_NETW_WAN ; do
 231       ifarpa=$( domain_ptr_any "${ifsubnet#*@}" )
 232       DM_LIST_FWD_ZONES="$DM_LIST_FWD_ZONES $ifarpa"
 233     done
 234   fi
 235 }
 236
 237 ##############################################################################
 238
 239 dnsmasq_inactive() {
 240   local record
 241
 242
 243   if [ $UB_D_EXTRA_DNS -gt 0 ] ; then
 244     # Parasite from the uci.dhcp.domain clauses
 245     DM_LIST_KNOWN_ZONES="$DM_LIST_KNOWN_ZONES $UB_TXT_DOMAIN"
 246     config_load dhcp
 247     config_foreach create_host_record_from_domain domain
 248     config_foreach create_host_record_from_host host
 249
 250
 251     if [ $UB_D_EXTRA_DNS -gt 1 ] ; then
 252       config_foreach create_srv_record srvhost
 253       config_foreach create_mx_record mxhost
 254     fi
 255
 256
 257     if [ $UB_D_EXTRA_DNS -gt 2 ] ; then
 258       config_foreach create_cname_record cname
 259     fi
 260
 261
 262     {
 263       echo "# $UB_SRVMASQ_CONF generated by UCI"
 264       if [ -n "$DM_LIST_TRN_ZONES" ] ; then
 265         for record in $DM_LIST_TRN_ZONES ; do
 266           echo "  local-zone: $record transparent"
 267         done
 268         echo
 269       fi
 270       if [ -n "$DM_LIST_LOCAL_DATA" ] ; then
 271         for record in $DM_LIST_LOCAL_DATA ; do
 272           echo "  local-data: \"${record//@@/ }\""
 273         done
 274         echo
 275       fi
 276       if [ -n "$DM_LIST_LOCAL_PTR" ] ; then
 277         for record in $DM_LIST_LOCAL_PTR ; do
 278           echo "  local-data-ptr: \"${record//@@/ }\""
 279         done
 280         echo
 281       fi
 282     } > $UB_SRVMASQ_CONF
 283   fi
 284 }
 285
 286 ##############################################################################
 287
 288 dnsmasq_active() {
 289   # Look at dnsmasq settings
 290   config_load dhcp
 291   # Zone for DHCP / SLAAC-PING DOMAIN
 292   config_foreach dnsmasq_local_zone dnsmasq
 293   # Zone for DHCP / SLAAC-PING ARPA
 294   dnsmasq_local_arpa
 295
 296
 297   if [ -n "$DM_LIST_FWD_PORTS" ] && [ -n "$DM_LIST_FWD_ZONES" ] ; then
 298     if [ $UB_B_DNS_ASSIST -lt 1 ] ; then
 299       {
 300         # Forward to dnsmasq on same host for DHCP lease hosts
 301         echo "# $UB_SRVMASQ_CONF generated by UCI"
 302         echo "  do-not-query-localhost: no"
 303         echo
 304       } > $UB_SRVMASQ_CONF
 305
 306     else
 307       echo > $UB_SRVMASQ_CONF
 308     fi
 309
 310     echo "# $UB_EXTMASQ_CONF generated by UCI" > $UB_EXTMASQ_CONF
 311
 312
 313     for fwd_domain in $DM_LIST_FWD_ZONES ; do
 314       {
 315         # This creates a domain with local privledges
 316         echo "  domain-insecure: $fwd_domain"
 317         echo "  private-domain: $fwd_domain"
 318         echo "  local-zone: $fwd_domain transparent"
 319         echo
 320       } >> $UB_SRVMASQ_CONF
 321
 322       {
 323         # This is derived from dnsmasq local domain and dhcp service subnets
 324         echo "forward-zone:"
 325         echo "  name: $fwd_domain"
 326         echo "  forward-first: no"
 327         for port in $DM_LIST_FWD_PORTS ; do
 328           echo "  forward-addr: 127.0.0.1@$port"
 329         done
 330         echo
 331       } >> $UB_EXTMASQ_CONF
 332     done
 333   fi
 334 }
 335
 336 ##############################################################################
 337
 338 dnsmasq_link() {
 339   if [ "$UB_D_DHCP_LINK" = "dnsmasq" ] ; then
 340     dnsmasq_active
 341
 342   else
 343     dnsmasq_inactive
 344   fi
 345 }
 346
 347 ##############################################################################
 348