# Count the number of HostKey and HostDsaKey statements we have.
gawk    'BEGIN {IGNORECASE=1}
         /^hostkey/ || /^hostdsakey/ {sawhostkey = sawhostkey + 1}
         END {exit sawhostkey}' /etc/ssh/sshd_config
# And if we only found one, we know the client was relying on the old default
# behavior, which loaded the the SSH2 DSA host key when HostDsaKey wasn't
# specified.  Now that HostKey is used for both SSH1 and SSH2 keys, specifying
# one nullifies the default, which would have loaded both.
if [ $? -eq 1 ] ; then
        echo HostKey /etc/ssh/ssh_host_rsa_key >> /etc/ssh/sshd_config
        echo HostKey /etc/ssh/ssh_host_dsa_key >> /etc/ssh/sshd_config
fi