#!/bin/sh
#----------------------------------------------------------------------------
# /etc/rc.d/rc580.fastd - start fast and secure tunneling daemon
#
# Creation:     2016-01-09  Alexander Dahl <post@lespocky.de>
# Last Update:  $Id$
#----------------------------------------------------------------------------

FASTD_ERR_NONE=0
FASTD_ERR_SECRET=1
FASTD_ERR_FASTD=2

if [ "${OPT_FASTD}" = 'yes' ]
then
    begin_script FASTD 'configuring fastd ...'

    # start subshell for easier error handling
    (
        # if secret is empty, generate a key, put it in /tmp, log something
        # and then get out of here, without secret we can not start anyway
        if [ -z "${FASTD_SECRET}" ]
        then
            log_info 'fastd: generating secret, get it from /tmp/fastd.secret'
            fastd --generate-key > /tmp/fastd.secret 
            # leave subshell
            exit $FASTD_ERR_SECRET
        fi

        # load tun/tap driver (fastd creates tunnels, we can not work without)
        do_modprobe tun

        # create fastd conf dir in /etc
        mkdir -p /etc/fastd

        # generate config files
        conffile=/etc/fastd/fastd.conf

        cat > $conffile << EOF
#----------------------------------------------------------------------------
# fastd.conf
# automatically created by rc580.fastd
#----------------------------------------------------------------------------

secret "${FASTD_SECRET}";
EOF

        {
            echo '# add array variables here later' >/dev/null
        } >> $conffile

        # start it up
        fastd -c $conffile

        ec=$?
        if [ $ec -ne 0 ]
        then
            log_error "fastd: could not start daemon, returned with ${ec}"
            exit $FASTD_ERR_FASTD
        fi

        exit $FASTD_ERR_NONE
    )

    # subshell error handling
    ec=$?
    if [ $ec -eq $FASTD_ERR_NONE ]
    then 
        log_info 'fastd: everything fine'
    elif [ $ec -eq $FASTD_ERR_SECRET ]
    then
        log_warn 'fastd: refuse to start without secret'
    else
        log_warn "fastd: configure/startup returned with ${ec}"
    fi

    end_script
fi