net/unbound/files/iptools.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 # These are iptools that might be useful in a larger package, if provided
  18 # elsewhere for common use. One example that many may find useful is turning
  19 # flexible IPV6 colon dividers into PTR. Otherwise these are incomplete and
  20 # would need robustness improvements for more generic applications.
  21 #
  22 ##############################################################################
  23
  24 domain_ptr_ip6() {
  25   # Get the nibble rounded /CIDR ...ip6.arpa.
  26   echo "$1" | awk -F: \
  27   'BEGIN { OFS = "" ; }
  28   { CIDR = $0 ;
  29   sub(/.*\//,"",CIDR) ;
  30   CIDR = (CIDR / 4) ;
  31   sub(/\/[0-9]+/,"",$0) ;
  32   ct_stop = 9 - NF ;
  33   for(i=1; i<=NF; i++) {
  34     if(length($i) == 0) {
  35       for(j=1; j<=ct_stop; j++) { $i = ($i "0000") ; } }
  36     else { $i = substr(("0000" $i), length($i)+5-4) ; } } ;
  37   y = $0 ;
  38   ct_start = length(y) - 32 + CIDR ;
  39   for(i=ct_start; i>0; i--) { x = (x substr(y,i,1)) ; } ;
  40   gsub(/./,"&\.",x) ;
  41   x = (x "ip6.arpa") ;
  42   print x }'
  43 }
  44
  45 ##############################################################################
  46
  47 host_ptr_ip6() {
  48   # Get complete host ...ip6.arpa.
  49   echo "$1" | awk -F: \
  50   'BEGIN { OFS = "" ; }
  51   { sub(/\/[0-9]+/,"",$0) ;
  52   ct_stop = 9 - NF ;
  53   for(i=1; i<=NF; i++) {
  54     if(length($i) == 0) {
  55       for(j=1; j<=ct_stop; j++) { $i = ($i "0000") ; } }
  56     else { $i = substr(("0000" $i), length($i)+5-4) ; } } ;
  57   y = $0 ;
  58   ct_start = length(y);
  59   for(i=ct_start; i>0; i--) { x = (x substr(y,i,1)) ; } ;
  60   sub(/[0-9]+\//,"",x) ;
  61   gsub(/./,"&\.",x) ;
  62   x = (x "ip6.arpa") ;
  63   print x }'
  64 }
  65
  66 ##############################################################################
  67
  68 domain_ptr_ip4() {
  69   # Get the byte rounded /CIDR ...in-addr.arpa.
  70   echo "$1" | awk \
  71   '{ CIDR = $0 ;
  72   sub(/.*\//,"",CIDR) ;
  73   CIDR = (CIDR / 8) ;
  74   dtxt = $0 ;
  75   sub(/\/.*/,"",dtxt) ;
  76   split(dtxt, dtxt, ".") ;
  77   for(i=1; i<=CIDR; i++) { x = (dtxt[i] "." x) ; }
  78   x = (x "in-addr.arpa") ;
  79   print x }'
  80 }
  81
  82 ##############################################################################
  83
  84 host_ptr_ip4() {
  85   # Get omplete host ...in-addr.arpa.
  86   echo "$1" | awk -F. \
  87   '{ x = ( $4"."$3"."$2"."$1".in-addr.arpa" ) ;
  88   sub(/\/[0-9]+/,"",x) ;
  89   print x }'
  90 }
  91
  92 ##############################################################################
  93
  94 valid_subnet6() {
  95   case "$1" in
  96     # GA
  97     [1-9][0-9a-f][0-9a-f][0-9a-f]":"*) echo "ok" ;;
  98     # ULA
  99     f[cd][0-9a-f][0-9a-f]":"*) echo "ok" ;;
 100     # fe80::, ::1, and such
 101     *) echo "not" ;;
 102   esac
 103 }
 104
 105 ##############################################################################
 106
 107 valid_subnet4() {
 108   case "$1" in
 109     # Link, Local, and Such
 110     169"."254"."*) echo "not" ;;
 111     127"."*) echo "not" ;;
 112     0"."*) echo "not" ;;
 113     255"."*) echo "not" ;;
 114     # Other Normal
 115     25[0-4]"."[0-9]*) echo "ok" ;;
 116     2[0-4][0-9]"."[0-9]*) echo "ok" ;;
 117     1[0-9][0-9]"."[0-9]*) echo "ok" ;;
 118     [0-9][0-9]"."[0-9]*) echo "ok" ;;
 119     [0-9]"."[0-9]*) echo "ok" ;;
 120     # Not Right
 121     *) echo "not";;
 122   esac
 123 }
 124
 125 ##############################################################################
 126
 127 valid_subnet_any() {
 128   local subnet=$1
 129   local validip4=$( valid_subnet4 $subnet )
 130   local validip6=$( valid_subnet6 $subnet )
 131
 132
 133   if [ "$validip4" = "ok" ] || [ "$validip6" = "ok" ] ; then
 134     echo "ok"
 135   else
 136     echo "not"
 137   fi
 138 }
 139 ##############################################################################
 140
 141 private_subnet() {
 142   case "$1" in
 143     10"."*) echo "ok" ;;
 144     172"."1[6-9]"."*) echo "ok" ;;
 145     172"."2[0-9]"."*) echo "ok" ;;
 146     172"."3[0-1]"."*) echo "ok" ;;
 147     192"."168"."*) echo "ok" ;;
 148     f[cd][0-9a-f][0-9a-f]":"*) echo "ok" ;;
 149     *) echo "not" ;;
 150   esac
 151 }
 152
 153 ##############################################################################
 154
 155 domain_ptr_any() {
 156   local subnet=$1
 157   local arpa validip4 validip6
 158
 159   validip4=$( valid_subnet4 $subnet )
 160   validip6=$( valid_subnet6 $subnet )
 161
 162
 163   if [ "$validip4" = "ok" ] ; then
 164     arpa=$( domain_ptr_ip4 "$subnet" )
 165   elif [ "$validip6" = "ok" ] ; then
 166     arpa=$( domain_ptr_ip6 "$subnet" )
 167   fi
 168
 169
 170   if [ -n "$arpa" ] ; then
 171     echo $arpa
 172   fi
 173 }
 174
 175 ##############################################################################
 176
 177 host_ptr_any() {
 178   local subnet=$1
 179   local arpa validip4 validip6
 180
 181   validip4=$( valid_subnet4 $subnet )
 182   validip6=$( valid_subnet6 $subnet )
 183
 184
 185   if [ "$validip4" = "ok" ] ; then
 186     arpa=$( host_ptr_ip4 "$subnet" )
 187   elif [ "$validip6" = "ok" ] ; then
 188     arpa=$( host_ptr_ip6 "$subnet" )
 189   fi
 190
 191
 192   if [ -n "$arpa" ] ; then
 193     echo $arpa
 194   fi
 195 }
 196
 197 ##############################################################################
 198