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#!/bin/sh
# Given a list of host names as arguments, generate a known_hosts file
# Copyright (C) 2013 Ryan Kavanagh <rak@debian.org>
# All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions
# are met:
# 1. Redistributions of source code must retain the above copyright
# notice, this list of conditions and the following disclaimer.
# 2. Redistributions in binary form must reproduce the above copyright
# notice, this list of conditions and the following disclaimer in the
# documentation and/or other materials provided with the distribution.
# 3. The name of the author may not be used to endorse or promote products
# derived from this software without specific prior written permission.
#
# THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,
# INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
# AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
# THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
# EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
# PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
# OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
# WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
# OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
# ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
for i in "$@"; do
IP4=$(host -t A "$i" | awk '{ print "," $NF }');
IP6=$(host -t AAAA "$i" | awk '{ print "," $NF }');
if test "${IP4}" = ",record"; then
IP4="";
fi
if test "${IP6}" = ",record"; then
IP6="";
fi
HOST=$(echo "${i}${IP4}${IP6}" | sed -e 's/ //g');
KEYS=$(ssh -q "$i" cat /etc/ssh/ssh_host_rsa_key.pub /etc/ssh/ssh_host_ecdsa_key.pub);
echo "${KEYS}" | sed -e 's/^/'"${HOST}"' /g';
done
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