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#!/bin/sh
##############################################################################
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License version 2 as
# published by the Free Software Foundation.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# Copyright (C) 2016 Eric Luehrsen
#
##############################################################################
#
# These are iptools that might be useful in a larger package, if provided
# elsewhere for common use. One example that many may find useful is turning
# flexible IPV6 colon dividers into PTR. Otherwise these are incomplete and
# would need robustness improvements for more generic applications.
#
##############################################################################
domain_ptr_ip6() {
# Get the nibble rounded /CIDR ...ip6.arpa.
echo "$1" | awk -F: \
'BEGIN { OFS = "" ; }
{ CIDR = $0 ;
sub(/.*\//,"",CIDR) ;
CIDR = (CIDR / 4) ;
sub(/\/[0-9]+/,"",$0) ;
ct_stop = 9 - NF ;
for(i=1; i<=NF; i++) {
if(length($i) == 0) {
for(j=1; j<=ct_stop; j++) { $i = ($i "0000") ; } }
else { $i = substr(("0000" $i), length($i)+5-4) ; } } ;
y = $0 ;
ct_start = length(y) - 32 + CIDR ;
for(i=ct_start; i>0; i--) { x = (x substr(y,i,1)) ; } ;
gsub(/./,"&\.",x) ;
x = (x "ip6.arpa") ;
print x }'
}
##############################################################################
host_ptr_ip6() {
# Get complete host ...ip6.arpa.
echo "$1" | awk -F: \
'BEGIN { OFS = "" ; }
{ sub(/\/[0-9]+/,"",$0) ;
ct_stop = 9 - NF ;
for(i=1; i<=NF; i++) {
if(length($i) == 0) {
for(j=1; j<=ct_stop; j++) { $i = ($i "0000") ; } }
else { $i = substr(("0000" $i), length($i)+5-4) ; } } ;
y = $0 ;
ct_start = length(y);
for(i=ct_start; i>0; i--) { x = (x substr(y,i,1)) ; } ;
sub(/[0-9]+\//,"",x) ;
gsub(/./,"&\.",x) ;
x = (x "ip6.arpa") ;
print x }'
}
##############################################################################
domain_ptr_ip4() {
# Get the byte rounded /CIDR ...in-addr.arpa.
echo "$1" | awk \
'{ CIDR = $0 ;
sub(/.*\//,"",CIDR) ;
CIDR = (CIDR / 8) ;
dtxt = $0 ;
sub(/\/.*/,"",dtxt) ;
split(dtxt, dtxt, ".") ;
for(i=1; i<=CIDR; i++) { x = (dtxt[i] "." x) ; }
x = (x "in-addr.arpa") ;
print x }'
}
##############################################################################
host_ptr_ip4() {
# Get omplete host ...in-addr.arpa.
echo "$1" | awk -F. \
'{ x = ( $4"."$3"."$2"."$1".in-addr.arpa" ) ;
sub(/\/[0-9]+/,"",x) ;
print x }'
}
##############################################################################
valid_subnet6() {
case "$1" in
# GA
[1-9][0-9a-f][0-9a-f][0-9a-f]":"*) echo "ok" ;;
# ULA
f[cd][0-9a-f][0-9a-f]":"*) echo "ok" ;;
# fe80::, ::1, and such
*) echo "not" ;;
esac
}
##############################################################################
valid_subnet4() {
case "$1" in
# Link, Local, and Such
169"."254"."*) echo "not" ;;
127"."*) echo "not" ;;
0"."*) echo "not" ;;
255"."*) echo "not" ;;
# Other Normal
25[0-4]"."[0-9]*) echo "ok" ;;
2[0-4][0-9]"."[0-9]*) echo "ok" ;;
1[0-9][0-9]"."[0-9]*) echo "ok" ;;
[0-9][0-9]"."[0-9]*) echo "ok" ;;
[0-9]"."[0-9]*) echo "ok" ;;
# Not Right
*) echo "not";;
esac
}
##############################################################################
private_subnet() {
case "$1" in
10"."*) echo "ok" ;;
172"."1[6-9]"."*) echo "ok" ;;
172"."2[0-9]"."*) echo "ok" ;;
172"."3[0-1]"."*) echo "ok" ;;
192"."168"."*) echo "ok" ;;
f[cd][0-9a-f][0-9a-f]":"*) echo "ok" ;;
*) echo "not" ;;
esac
}
##############################################################################
domain_ptr_any() {
local subnet=$1
local arpa validip4 validip6
validip4=$( valid_subnet4 $subnet )
validip6=$( valid_subnet6 $subnet )
if [ "$validip4" = "ok" ] ; then
arpa=$( domain_ptr_ip4 "$subnet" )
elif [ "$validip6" = "ok" ] ; then
arpa=$( domain_ptr_ip6 "$subnet" )
fi
if [ -n "$arpa" ] ; then
echo $arpa
fi
}
##############################################################################