#!/bin/sh
#----------------------------------------------------------------------------
# /etc/rc.d/circuits.ppp-i4l - PPP over ISDN4Linux (client side)
#
# Last Update:  $Id$
#----------------------------------------------------------------------------

. /etc/rc.d/circuits-common.ppp-i4l

# $1 = circuit information file
# $2 = PPP peer file
# $3 = variable receiving an error message (if any)
ppp_isdn_circuit_add()
{
    circuit_allocate_device ippp ippp_dev
    local ippp_unit=${ippp_dev#ippp}
    if [ $ippp_unit -ge $ISDN_PPP_MAX_CHANNELS ]
    then
        eval $3="\"Cannot use more than $ISDN_PPP_MAX_CHANNELS ISDN channels\""
        return 1
    fi

    # by default, wait at most 15 seconds until the ISDN line is connected
    local circ_ppp_isdn_timeout=${circ_ppp_isdn_timeout:-15}

    # the command that pppd shall execute
    local ippp_cmd="exec /usr/sbin/ppp2i4l -d $circ_debug -l local2 -t $circ_ppp_isdn_timeout /dev/$ippp_dev $ippp_dev"

    do_modprobe ppp_async

    isdnctrl addif $ippp_dev
    ip link set dev $ippp_dev down
    ip link set dev $ippp_dev mtu $ISDN_PPP_MAX_NETIF_MTU

    case $circ_ppp_isdn_msn in
    '') ;;
    *)  isdnctrl eaz $ippp_dev $circ_ppp_isdn_msn ;;
    esac

    local i
    for i in $circ_ppp_isdn_dialout
    do
        isdnctrl addphone $ippp_dev out $i
    done

    isdnctrl l2_prot $ippp_dev hdlc
    isdnctrl l3_prot $ippp_dev trans
    isdnctrl encap $ippp_dev syncppp
    isdnctrl huptimeout $ippp_dev 0    # hangup timeout is controlled by pppd
    isdnctrl dialmode $ippp_dev manual # dial mode is controlled by pppd
    isdnctrl chargehup $ippp_dev off
    isdnctrl secure $ippp_dev on
    isdnctrl pppbind $ippp_dev $ippp_unit

    : ${circ_ppp_mtu:=$ISDN_PPP_MTU}
    : ${circ_ppp_mru:=$ISDN_PPP_MTU}
    ppp_disconnect="exec /sbin/isdnctrl hangup $ippp_dev"

    # A/C compression _must_ be prohibited as the ISDN subsystem needs
    # these fields to work correctly
    #
    # "sync" is not activated to not risk lost frames due to unwanted merging
    cat >> $2 <<EOF
pty "$ippp_cmd"
local
noaccomp
EOF

    cat >> $1 <<EOF
circ_ppp_isdn_msn="$circ_ppp_isdn_msn"
circ_ppp_isdn_dialout="$circ_ppp_isdn_dialout"
EOF

    return 0
}