#!/bin/bash
# made for bash. not sure if all /bin/sh work.
# be sure to set these variables first.
#RESDB_PATH=/var/db/resdb
#ZONEFILE_DIR=/etc/namedb
# optional:
: ${TLDS:=ano}
: ${RDNS_PREFIX:=21}
: ${RDNS6_PREFIX:=fd63:1e39:6f73} #not actually used atm.

if [ ! "$ZONEFILE_DIR" ];then
 echo "You forgot to set some variables. read the source plzkthx." >&2
 exit 1
fi

DOM="3.7.f.6.9.3.e.1.3.6.d.f.ip6.arpa"
RDNS_ZONEFILE="$ZONEFILE_DIR/$DOM"

echo -n 'generating IPv6 reverse lookup zonefile for' $DOM '...' >&2
echo "; this zonefile generated on: `date -u`" > "$RDNS_ZONEFILE".tmp
echo '$TTL 3600' >> "$RDNS_ZONEFILE".tmp
echo '$ORIGIN' $DOM. >> "$RDNS_ZONEFILE".tmp
echo $DOM. 'IN SOA' $DOM. 'root ('`date -u +" %Y%m%d%H"`' 60 300 3600000 3600 )' >> "$RDNS_ZONEFILE".tmp
echo $DOM. 'IN NS ' $DOM. >> "$RDNS_ZONEFILE".tmp
echo $DOM. 'IN A   127.0.0.1' >> "$RDNS_ZONEFILE".tmp
cd $RESDB_PATH/db/ip6/F/D/6/3/1/E/3/9/6/F/7/3/
for i in  */*/*/*/ns/*;do
 a=$(printf "%s\n" "$i" | cut -d/ -f1-4 | tr '/' '.' | rev)
 b=$(printf "%s\n" "$i" | cut -d/ -f6)
 printf '%s IN NS %s.\n' "$a" "$b"
done >> "$RDNS_ZONEFILE".tmp
mv -f "$RDNS_ZONEFILE".tmp "$RDNS_ZONEFILE"
echo " done." >&2


# convert to hex
if [ "*" != "$RDNS_PREFIX" ];then
 X=""
 for PFX in $RDNS_PREFIX;do
  C=`printf "%02X\n" $PFX 2>/dev/null`
  [ -z "$X" ] && X="$C" || X="$X $C"
 done
 RDNS_PREFIX="$X"
fi


cd "$RESDB_PATH/db/ip" || exit 1
for PFX in $RDNS_PREFIX;do
 cd "$RESDB_PATH/db/ip/$PFX" 2>/dev/null || continue
 IP=$((0x$PFX))
 DOM=$IP.in-addr.arpa
 RDNS_ZONEFILE="$ZONEFILE_DIR/$DOM"
 echo -n "generating IPv4 reverse lookup zonefile for $IP/8..." >&2

 echo "; this zonefile genreated on: `date -u`" > "$RDNS_ZONEFILE".tmp
 echo '$TTL 3600' >> "$RDNS_ZONEFILE".tmp
 echo '$ORIGIN' $DOM. >> "$RDNS_ZONEFILE".tmp
 echo $DOM. 'IN SOA' $DOM. 'root ('`date -u +" %Y%m%d%H"`' 60 300 3600000 3600 )' >> "$RDNS_ZONEFILE".tmp
 echo $DOM. 'IN NS ' $DOM. >> "$RDNS_ZONEFILE".tmp
 echo $DOM. 'IN A   127.0.0.1' >> "$RDNS_ZONEFILE".tmp

 for i in */*/ns/*;do
  [ -e "$i" ] || continue
  f=$(basename $i)
  a=$(basename $(dirname $i))
  b=$(basename $(dirname $(dirname $i)))
  c=$(basename $(dirname $(dirname $(dirname $i))))
  ipv4=`printf "%d.%d" $((0x$b)) $((0x$c))`
  printf "%-7s IN NS %s\n" $ipv4 ${f}.
 done >> "$RDNS_ZONEFILE".tmp
 mv -f "$RDNS_ZONEFILE".tmp "$RDNS_ZONEFILE"
 echo " done." >&2
done


cd "$RESDB_PATH/db/dom"
for TLD in $TLDS;do
 cd "$RESDB_PATH/db/dom/$TLD" 2>/dev/null || continue
 ANO_ZONEFILE="$ZONEFILE_DIR/$TLD"
 echo -n "generating .${TLD} TLD zonefile..." >&2

 echo "; this zonefile genreated on: `date -u`" > "$ANO_ZONEFILE".tmp
 echo '$TTL 3600' >> "$ANO_ZONEFILE".tmp
 echo '$ORIGIN' $TLD. >> "$ANO_ZONEFILE".tmp
 echo $TLD. 'IN SOA' $TLD. 'root ('`date -u +" %Y%m%d%H"`' 60 300 3600000 3600 )' >> "$ANO_ZONEFILE".tmp
 echo $TLD. 'IN NS ' $TLD. >> "$ANO_ZONEFILE".tmp
 echo $TLD. 'IN A   127.0.0.1' >> "$ANO_ZONEFILE".tmp

 for name in *;do
  if [ -d "$name/ns" ];then
   for server in "$name"/ns/*;do
    [ -e "$server" ] || continue
    fqserver=`cut -d/ -f3- <<< "$server"`
    echo -e "${name}\tIN NS\t${fqserver}."
    for ip in $(cat $server);do
     if grep ':' <<< "$ip" > /dev/null;then
      printf '%s.\tIN AAAA\t%s\n' "${fqserver}" "${ip}"
     else
      printf '%s.\tIN A\t%s\n' "${fqserver}" "${ip}"
     fi
    done
   done
  fi
 done >> "$ANO_ZONEFILE".tmp
 mv -f "$ANO_ZONEFILE".tmp "$ANO_ZONEFILE"
 echo " done." >&2
done

echo might want to send a sighup to your named now. >&2