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|
#!/bin/sh -
#
# @(#)rblookup e07@nikhef.nl (Eric Wassenaar) 990127
#
# Author: E.Wassenaar, Nikhef-H
# Version: 11-NOV-1997
# Revision: 02-NOV-1998, Select MAPS (default) or alternatively ORBS
# Revision: 07-NOV-1998, Anticipate hosts with multiple addresses
# Revision: 27-JAN-1999, ORBS has moved to a new site
#
# Lookup a dotted quad IP address in the Realtime Blackhole List
# of the Mail Abuse Prevention System. See: http://maps.vix.com/rbl
#
# Syntax:
# rblookup hostname
# rblookup -i dottedquad
#
# Returns:
# zero if the given host was found on the blacklist.
# nonzero if not, or if undetermined.
#
# The RBL is an on-line, dynamically updated database of spam hosts,
# maintained via the DNS. The search key is the reversed dotted quad
# IP address of the given host, within the zone "rbl.maps.vix.com".
# A query should be done for an A resource record. If it exists, the
# given host is blacklisted as a notorious spam host. The value of the
# retrieved A record is irrelevant and can be ignored. Additional info
# may be found via an extra query for a TXT resource record.
#
# The RBL data in the DNS is replicated by several nameservers, using
# a refresh time of 10 minutes. The TTL for local caching is 5 minutes.
# The RBL nameservers do not allow zone transfers from arbitrary hosts,
# thereby preventing the setup of a stealth server, unless you sign a
# non-proliferation agreement (and you are running BIND version 8).
#
# This script is just an example of a quick and dirty wrapper for the
# ``host'' utility. The technique can relatively easy be integrated
# into MTA programs like sendmail.
exec=echo
exec=
# ----------------------------------------------------------------------
# Setup environment.
# ----------------------------------------------------------------------
# This is where the ``host'' executable lives.
BINDIR=/usr/local/bin
PATH=${BINDIR}:/bin:/usr/bin:/usr/ucb ; export PATH
cmd=`basename $0`
options="[-maps] [-orbs] [-i] [-v]"
usage="Usage: $cmd $options hostname"
# ----------------------------------------------------------------------
# Configuration.
# ----------------------------------------------------------------------
MAPSROOT="rbl.maps.vix.com"
ORBSROOT="relays.orbs.org"
# ----------------------------------------------------------------------
# Exit codes from <sysexits.h>
# ----------------------------------------------------------------------
EX_OK=0
EX_USAGE=64
EX_UNAVAILABLE=69
# ----------------------------------------------------------------------
# Auxiliary routines.
# ----------------------------------------------------------------------
fatal ()
{
message="$*"
echo "$message" 1>&2
exit $EX_USAGE
}
# ----------------------------------------------------------------------
# Process options.
# ----------------------------------------------------------------------
verbose=
reverse=
orbs=
skip=
for i
do
[ $skip ] && skip= && continue
case "$i" in
-orbs) orbs=true ;;
-maps) orbs= ;;
-i) reverse=true ;;
-v) verbose="-v" ;;
-d) exec=echo ;;
-*) fatal "$cmd: Unknown option $i" ;;
*) break ;;
esac
shift
done
# ----------------------------------------------------------------------
# Process arguments.
# ----------------------------------------------------------------------
name="$1"
[ "X$name" = "X" ] && fatal "$usage"
# Remove trailing dots.
name=`echo $name | sed 's/\.*$//'`
if [ $reverse ]
then
# Assume this is already a dotted quad.
addresslist="$name"
else
# Try to resolve domain name into dotted quad.
addresslist=`host "$name" | awk '$2 == "A" {print $3}'`
fi
# ----------------------------------------------------------------------
# Auxiliary routines.
# ----------------------------------------------------------------------
invalid ()
{
fatal "Invalid dotted quad $address"
}
numeric ()
{
[ "X$1" = "X" ] && invalid
# Must be numeric.
value=`expr $1 + 0` ; [ "X$value" = "X" ] && invalid
# Must be in range.
[ "$value" -lt 0 -o "$value" -gt 255 ] && invalid
return $EX_OK
}
invert ()
{
labels=`echo "$address" | sed -e 's/\./ /g'`
set - $labels
case "$#" in
1)
numeric $1
reversed="0.0.0.$1"
;;
2)
numeric $1 && numeric $2
reversed="0.0.$2.$1"
;;
3)
numeric $1 && numeric $2 && numeric $3
reversed="0.$3.$2.$1"
;;
4)
numeric $1 && numeric $2 && numeric $3 && numeric $4
reversed="$4.$3.$2.$1"
;;
*)
invalid
;;
esac
}
# ----------------------------------------------------------------------
# Main procedure.
# ----------------------------------------------------------------------
exitstat=$EX_UNAVAILABLE
for address in $addresslist
do
# Swap dotted quad labels.
invert
# Construct proper name in map.
[ $orbs ] && map="$ORBSROOT" || map="$MAPSROOT"
name="$reversed.$map"
echo "--- $name ---"
$exec host $verbose -t A $name
found=$?
[ $found -eq $EX_OK ] && exitstat=$EX_OK
[ $found -eq $EX_OK ] && $exec host $verbose -t TXT $name
done
exit $exitstat
|
