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#!/bin/sh
#
# This script uses the named D-BUS support, which must be enabled in
# the running named with the named '-D' option, to get and print the
# list of forwarding zones in the running server.
#
# It accepts an optional <zone> first argument which is the DNS name
# of the zone whose forwarders (if any) will be retrieved.
#
# If no zone argument is specified, all forwarding zones will be listed.
#
# Usage: namedGetForwarders [-n -r] [ <zone> ]
# -n : output forward zone statements for named.conf
# -r : output in resolv.conf format
# : no -r or -n: just list the forwarders
#
# This script is based on perl script of Jason Vas Dias <jvdias@redhat.com>.
#
# Copyright(C) Baris Cicek <baris@nerd.com.tr> Nerd Software. 2007
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation at
# http://www.fsf.org/licensing/licenses/gpl.txt
# and included in this software distribution as the "LICENSE" file.
#
# 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.
declare -a zones;
declare -a servers;
declare -a ports;
declare -a only;
output_format='plain';
zonecnt=0;
function push () {
local array
array=( `echo $1` );
array[${#array[*]}]=$2;
echo ${array[@]};
}
function concat () {
local string
while [ $# -gt 0 ]; do
string=${string}$1;
shift;
done
echo $string;
}
if [ $# -ge 0 ]; then
if [ "$1" == "-r" ]; then
output_format='resolv';
shift;
elif [ "$1" == "-n" ]; then
output_format='named';
shift;
fi
zone="";
for arg in $*; do
zone=$(push "$zone" " string:'$arg'");
done
fi
DNS=`/bin/dbus-send --system --type=method_call --print-reply --reply-timeout=20000 --dest=com.redhat.named /com/redhat/named com.redhat.named.text.GetForwarders $zone`;
if [ $? -ne 0 ]; then
echo -e "dbus-send failed: $? $!";
exit 1;
fi
IFS=$'\n'
for line in $DNS; do
match_ip=$( echo "$line" | awk --re-interval '{ match ($0, /([[:digit:]]{1,3})\.([[:digit:]]{1,3})\.([[:digit:]]{1,3})\.([[:digit:]]{1,3})/, a); printf "%s.%s.%s.%s", substr($0, a[1, "start"], a[1, "length"]), substr($0, a[2, "start"], a[2, "length"]), substr($0, a[3, "start"], a[3, "length"]), substr($0, a[4, "start"], a[4, "length"]);}' );
match_port=$( echo "$line" | awk '{ match ($0, /\"([[:digit:]]+)\"$/, a); printf "%s", substr($0, a[1, "start"], a[1,"length"]);}' );
match_string=$( echo "$line" | awk '{ match ($0, /string.+\"([^\"]+)\"$/, a); printf "%s", substr($0, a[1, "start"], a[1,"length"]);}' );
if [ "$match_ip" != "" ] && [ "$match_ip" != "..." ]; then
servers[$zonecnt]=$(push "${servers[$zonecnt]}" "$match_ip");
elif [ "$match_port" != "" ]; then
ports[$zonecnt]=$(push "${ports[$zonecnt]}" "$match_port");
elif [ "$match_string" == "only" ]; then
only[$zonecnt]="1";
elif [ "$match_string" != "" ] && [ "$match_string" != "first" ]; then
zonecnt=$((zonecnt + 1));
zones[$zonecnt]="$match_string";
fi
done
if [ "$output_format" == "resolv" ]; then
# resolv.conf style:
search_line='search';
nameserver_lines='';
for index in $(seq 1 $zonecnt); do
if [ "` echo ${zones[$index]} | awk ' /\.in-addr\.arpa$/ { print $0 }'`" == '' ]; then
search_line=$(push "$search_line" "${zones[$index]}");
fi
IFS=$' ';
for ns in ${servers[$index]}; do
nameserver_lines=$(concat "$nameserver_lines" "\nnameserver " "$ns");
done
done
echo -n $search_line;
echo -e $nameserver_lines;
elif [ "$output_format" == "named" ]; then
# named.conf style:
zone_lines='';
for index in $(seq 1 $zonecnt); do
zone_line=$(concat 'zone "' "${zones[$index]}" '." IN { type forward; forwarders { ');
srvcnt=1;
IFS=$' ';
for ns in ${servers[$index]}; do
srvport=$(eval "echo ${ports[$index]} | awk '{ print \$${srvcnt} }'");
if [ "$srvport" != "53" ]; then
zone_line=$(concat "$zone_line" " $ns port $srvport;");
else
zone_line=$(concat "$zone_line" " $ns;");
fi
srvcnt=$((srvcnt+1));
done
zone_line=$(concat "$zone_line" " };");
if [ "${only[$index]}" == '1' ]; then
zone_line=$(concat "$zone_line" " forward only;");
fi
zone_line=$(concat "$zone_line" " };");
zone_lines=$(concat "$zone_lines" "$zone_line\n");
done
echo -e ${zone_lines%\\n};
elif [ "$output_format" == "plain" ]; then
# just list:
output='';
for index in $(seq 1 $zonecnt); do
output=$(concat "$output" "${zones[$index]}" "\n");
if [ "${only[$index]}" == "1" ]; then
output=$(concat "$output" "\t" "forward only" "\n");
fi
srvcnt=1;
IFS=$' ';
for ns in ${servers[$index]}; do
srvport=$(eval "echo ${ports[$index]} | awk '{ print \$${srvcnt} }'");
if [ "$srvport" != "53" ]; then
output=$(concat "$output" "\t" "$ns:$srvport" "\n");
else
output=$(concat "$output" "\t" "$ns" "\n");
fi
srvcnt=$((srvcnt+1));
done
done
echo -e ${output%\\n};
fi
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