#!/usr/bin/sh
#----------------------------------------------------------------------------
# /usr/libexec/dsl/dsl - start/stop script for PPPoE modules
#
# Creation:     2024-12-09 hbfl
# Last Update:  $Id$
#
# Copyright (c) 2024-@@YEAR@@ Holger Bruenjes, holgerbruenjes(at)gmx(dot)net
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#----------------------------------------------------------------------------

package_name='dsl'

#exec 2>/tmp/dsl-trace$$.log
#set -x

# read configuration
. /etc/config.d/dsl
. /etc/config.d/base

load='/sbin/modprobe'
unload='/sbin/modprobe -r'

ppp_modules='slhc ppp_generic pppoe'

ppp_modules_rev='n_hdlc ppp_synctty ppp_async ppp_generic slhc pppoe'

#exec 2>/tmp/dsl-trace$$.log
#set -x

# ---------------------------------------------------------------------------
# unload modules
#
# recursively unload a module and its dependencies, if possible.
# where's modprobe -r when you need it?
# inputs: module to unload.
# returns: the result from
# ---------------------------------------------------------------------------
unload_modules()
{
    module="${1}"
    line=$(/usr/bin/lsmod 2>/dev/null | /usr/bin/grep "^${1} ")

    if [ -z "${line}" ]
    then
        return
    fi # module was not loaded

    set -- ${line}
    # $1: the original module
    # $2: size
    # $3: refcount
    # $4: deps list
    # use newline here to can do 'grep -v' not a space
    mods=$(echo ${4} | /usr/bin/tr , '\n')

    for mod in ${mods}
    do
        # run in a subshell, so it won't step over our vars:
        (
            unload_modules ${mod}
        )
        # TODO: the following is probably the error handling we want:
        # if [ $? != 0 ]; then return 1; fi
    done
    /usr/sbin/rmmod ${module}
}

# ---------------------------------------------------------------------------
# start dsl
# ---------------------------------------------------------------------------
dsl_start()
{
    /usr/sbin/ip addr flush dev ppp0 2>/dev/null

    # set pppoe.nmconnection
    {
        eval ethx="${DSL_PPPOE_BIND_ETH}"
        eval pppoe_iface='${IP_ETH_'${ethx}'_NAME}'

        # set interface parameter
        echo '[connection]'
        echo 'id=pppoe'
        echo 'autoconnect=true'
        echo 'type=pppoe'
        echo "interface-name=${pppoe_iface}"

        echo
        echo '[ethernet]'
        echo

        echo '[ppp]'
        echo 'refuse-eap=true'
        echo 'refuse-mschap=true'
        echo 'refuse-mschapv2=true'
        echo

        echo '[pppoe]'
        echo "password=${DSL_PPPOE_PASS}"
        echo "username=${DSL_PPPOE_USER}"

        ipv4_method='auto'

        echo
        echo '[ipv4]'

        if [ "${DSL_PPPOE_USEPEERDNS:-no}" != "yes" ]
        then
            echo 'ignore-auto-dns=true'
            # include to set dns responder
            . /var/install/include/nm-get-dns
        fi

        echo "method=${ipv4_method}"

        ipv6_method='auto'

        echo
        echo '[ipv6]'
        echo 'addr-gen-mode=default'
        echo "method=${ipv6_method}"

        echo
        echo '[proxy]'
        echo
    } > /etc/NetworkManager/system-connections/pppoe.nmconnection

    /usr/bin/chmod 0600 /etc/NetworkManager/system-connections/pppoe.nmconnection
    >/run/netconfig/pppoe.nmconnection


    local=10.112.112.112
    remote=10.112.112.113
    netmask=255.255.255.0

    echo ${local} >/run/pppoe.conf
    echo ${remote} >>/run/pppoe.conf
    echo ${netmask} >>/run/pppoe.conf
    echo auto >/run/pppoe.dialmode
}

# ---------------------------------------------------------------------------
# stop dsl
# ---------------------------------------------------------------------------
dsl_stop()
{
    for i in 0 1 2 3
    do
        /usr/sbin/ip addr flush dev ppp${i} 2>/dev/null
        /usr/sbin/ip link del ppp${i} 2>/dev/null
    done
    
    /usr/sbin/modprobe -r 'pppoe' 2>/dev/null
}

# ---------------------------------------------------------------------------
# main
# ---------------------------------------------------------------------------
main()
{
    while [ "${#}" -gt 0 ]
    do
        case "${1}" in
        -q|--quiet)
            _quiet=true
            shift
            ;;
        *)
            _action=${1}
            shift
            ;;
        esac
    done

    case "${_action}" in
    start)
        dsl_start
        ;;
    stop)
        dsl_stop
        ;;
    esac

    exit 0
}

# ---------------------------------------------------------------------------
# exec main
# ---------------------------------------------------------------------------
main "${@}"

# ---------------------------------------------------------------------------
# end
# ---------------------------------------------------------------------------