# Contributed by Robbie Smith <zoqaeski@gmail.com>
# Based on Thomas Bächler’s <thomas@archlinux.org> pppoe script
# Also see <https://wiki.archlinux.org/index.php/3G_and_GPRS_modems_with_pppd> for more information.

: ${PPPD:=pppd}
# Set the interface route
: ${InterfaceRoot=dev/}

_quotestring() {
    echo "\"${1/\"/\\\"}\""
}

mobile_ppp_up() {
    local cfg
    local chat

    mkdir -p "$STATE_DIR/mobile_ppp.${Interface}.${Profile}/"
    chmod 700 "$STATE_DIR/mobile_ppp.${Interface}.${Profile}/"
    cfg="$STATE_DIR/mobile_ppp.${Interface}.${Profile}/options"
    chat="$STATE_DIR/mobile_ppp.${Interface}.${Profile}/modem.chat"
    : > "${cfg}"
    chmod 600 "${cfg}"

    echo "linkname $(_quotestring "${Profile}")" >> "${cfg}"

    cat >> "${cfg}" << EOF
${Interface}
921600
lock
crtscts
modem
passive
novj
holdoff 10
maxfail 5
EOF

    # Debug pppd output separately from netcfg
    if is_yes "${PPPDebug:-yes}"; then
        echo "debug" >> "${cfg}"
    fi

    # Sets up route
    if is_yes "${DefaultRoute:-yes}"; then
        echo "defaultroute" >> "${cfg}"
    else
        echo "nodefaultroute" >> "${cfg}"
    fi
    if is_yes "${UsePeerDNS:-yes}"; then
        echo "usepeerdns" >> "${cfg}"
    fi

    # Writes username and password
    echo "noauth" >> "${cfg}"
    echo "hide-password" >> ${cfg}
    [[ -n ${User} ]] && echo "user $(_quotestring "${User}")" >> "${cfg}"
    [[ -n ${Password} ]] && echo "password $(_quotestring "${Password}")" >> "${cfg}"

    #echo "'OK' @/etc/ppp/chatscripts/pin" >> "${chat}"
    if [ -n "${Pin}" ]; then
        PinStr="'OK' 'AT+CPIN=${Pin}'"
    else
        PinStr="'OK' 'AT'"
    fi
    report_debug echo $PinStr

    # Mode can be one of 3Gpref, 3Gonly, GPRSpref, GPRSonly, None
    # Only works for Huawei modems
    #echo "'OK' @/etc/ppp/chatscripts/mode" >> "${chat}"
    case "${Mode}" in
        3Gonly)
            ModeStr="'OK' 'AT\^SYSCFG=14,2,3fffffff,0,1'"
            ;;
        3Gpref)
            ModeStr="'OK' 'AT\^SYSCFG=2,2,3fffffff,0,1'"
            ;;
        GPRSonly)
            ModeStr="'OK' 'AT\^SYSCFG=13,1,3fffffff,0,0'"
            ;;
        GPRSpref)
            ModeStr="'OK' 'AT\^SYSCFG=2,1,3fffffff,0,0'"
            ;;
        *)
            ModeStr="'OK' 'AT'"
            ;;
    esac

    # Now that we’ve got the ppp configuration set up, write the chat script
    cat >> "${chat}" << EOF
ECHO ON
ABORT 'BUSY'
ABORT 'NO CARRIER'
ABORT 'VOICE'
ABORT 'NO DIALTONE'
ABORT 'NO DIAL TONE'
ABORT 'NO ANSWER'
ABORT 'DELAYED'
ABORT   '\nRINGING\r\n\r\nRINGING\r'
REPORT CONNECT
TIMEOUT 6
'' 'ATQ0'
'OK-AT-OK' 'ATZ'
TIMEOUT 3
${PinStr}
'OK\d-AT-OK' 'ATI'
'OK' 'ATZ'
'OK' 'ATQ0 V1 E1 S0=0 &C1 &D2 +FCLASS=0'
${ModeStr}
'OK-AT-OK' 'AT+CGDCONT=1,"IP","${AccessPointName}"'
'OK' 'ATDT*99#'
TIMEOUT 30
CONNECT ''
EOF

    # Add the chat script line to the configuration
    echo "connect \"/usr/sbin/chat -v -t15 -f ${chat}\"" >> "${cfg}"

    ip link set dev "${Interface}" up
    #$PPPD call "$Peer" updetach child-timeout "$PPPTimeout" linkname "$Peer"
    $PPPD file "${cfg}"

    if [[ $? -ne 0 ]]; then
        rmdir "$STATE_DIR/mobile_ppp.${Interface}.${Profile}/"
        report_error "Couldn't make pppd connection."
        return 1
    fi
}

mobile_ppp_down() {
    local cfg
    local chat
    cfg="$STATE_DIR/mobile_ppp.${Interface}.${Profile}/options"
    chat="$STATE_DIR/mobile_ppp.${Interface}.${Profile}/modem.chat"
    PIDFILE="/var/run/ppp-${Profile}.pid"

    if [[ -e $PIDFILE ]]; then
        read PID < "$PIDFILE"
        [[ "$PID" ]] && kill "$PID"
    fi

    rm "${cfg}"
    rm "${chat}"
    rmdir "$STATE_DIR/mobile_ppp.${Interface}.${Profile}/"
}


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