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