#!/bin/bash

KEY_TRACE="Server host key:"
SSH_CHECK_KEY="https://soutade.fr/files/ssh_check/ssh_check"
REMOTE_USER="check-user"

if [ -z "$1" ] ; then
    echo "usage : $@ <ssh server>"
    exit 0
fi

echo "Retrieve remote key for $1"
tmp_file=`mktemp`
ssh -v -o "NumberOfPasswordPrompts=0" $@ >${tmp_file} 2>&1
key=`cat ${tmp_file}|grep "${KEY_TRACE}"`
key=`echo ${key}|cut -d" " -f6`
rm -f ${tmp_file}

echo "Retrieve SSH private key from ${SSH_CHECK_KEY}"
wget -O ssh_check ${SSH_CHECK_KEY}
chmod 0400 ssh_check

echo "Check for key ${key}"
ssh -l ${REMOTE_USER} -i ssh_check $@ "${key}"
echo "Cleaning"
rm -f ssh_check