tlp-rdw-nm.in

#!/bin/sh
# tlp-rdw - network manager dispatcher hook:
#           enable/disable radios on ifup/ifdown
#
# Copyright (c) 2021 Thomas Koch <linrunner at gmx.net> and others.
# This software is licensed under the GPL v2 or later.

# shellcheck disable=SC2086

# --- Source libraries

for lib in @TLP_TLIB@/tlp-func-base @TLP_FLIB@/25-tlp-func-rf @TLP_FLIB@/30-tlp-func-rf-sw; do
    # shellcheck disable=SC1090
    . $lib || exit 70
done

# --- Functions

check_switch_lock() { # switch listed radio devices
    # and time-lock them afterwards if actually switched
    # $1: device type where the event originated -- do nothing if its time-locked
    # $2: list of device types to switch
    # $3: on/off
    local type

    # quit if the originating *radio* device is time-locked (not LAN)
    [ "$1" != "LAN" ] && check_timed_lock "${RDW_NM_LOCK}_$1" && return 1

    for type in $2; do
        if [ -n "$type" ] && [ "$type" != "$1" ]; then
            # device type is valid and not the originating one
            # --> do switch with state change lock
            device_switch $type $3 "${RDW_NM_LOCK}_${type}" $RDW_LOCKTIME
        fi
    done

    return 0
}

save_iface_type () { # save interface type -- $1: interface; $2: type
    # rc: 0=saved/1=error
    [ -d $NETD/$1 ] && { printf '%s\n' "$2" > $RUNDIR/${1}.itype; } 2> /dev/null
    return $?
}

get_iface_type () { # get saved interface type -- $1: interface
    # rc: 0=saved state found/1=not found
    # retval: $itype
    local rc

    itype=$(read_sysf $RUNDIR/${1}.itype); rc=$?
    rm -f $RUNDIR/${1}.itype
    return $rc
}

# --- MAIN

# read configuration: quit on error, trace allowed
read_config 1 0

check_tlp_enabled || do_exit 0
check_run_flag $RDW_KILL && do_exit 0
add_sbin2path

# Get args
iface="$1"
action="$2"
itype=""


# Quit for invalid interfaces
# shellcheck disable=SC2015
[ -n "$iface" ] && [ "$iface" != "none" ] || do_exit 0

# Quit for actions other than "up" and "down"
[ "$action" = "up" ] || [ "$action" = "down" ] || do_exit 0

#  Quit for virtual interfaces (up action)
if [ "$action" = "up" ] && readlink "$NETD/$iface" | grep -q '/virtual/'; then
    # save type for down action where $NETD/$iface won't be there anymore
    save_iface_type $iface virtual
    [ "$X_NET_VIRTUAL_TRACE" = 1 ] && \
        echo_debug "nm" "+++ rdw_nm($iface).up.ignore_virtual"
    do_exit 0
fi

# Get saved interface type (down action)
if [ "$action" = "down" ]; then
    get_iface_type $iface

    # quit for virtual interfaces
    if [ "$itype" = "virtual" ]; then
        [ "$X_NET_VIRTUAL_TRACE" = 1 ] && \
            echo_debug "nm" "+++ rdw_nm($iface).down.ignore_virtual"
        do_exit 0
    fi
fi

echo_debug "nm" "+++ rdw_nm($iface).$action"
# shellcheck disable=SC2154
if [ -n "$_addpath" ]; then
    # shellcheck disable=SC2154
    echo_debug "path" "PATH=${_oldpath}[${_addpath}]"
else
    # shellcheck disable=SC2154
    echo_debug "path" "PATH=${_oldpath}"
fi

# Determine interface type
if [ -n "$itype" ]; then
    # saved type available (down action)
    echo_debug "nm" "rdw_nm($iface).$action: type=$itype [saved]"

elif cmd_exists $NMCLI ; then
    # no saved type but nmcli is available
    # --> check if nmcli dev output matches interface
    itype="$($NMCLI dev | awk '$1 ~ /^'$iface'$/ { print $2; }')"

    if [ -z "$itype" ]; then
        # iface is not found in nmcli dev output: many WWAN devices have
        # different devices for control and the actual network connection
        # --> check if interface matches a WWAN device
        get_wwan_ifaces
        # shellcheck disable=SC2154
        if wordinlist "$iface" "$_wanifaces"; then
            itype="wwan"
        else
            # fallback:
            # if interface type detection with nmcli failed, then try to
            # deduct it using interface name: it can happen if e.g.
            # usb network card is unplugged
            case "$iface" in
                en* | eth*)
                    itype="ethernet"
                    ;;

                wl*)
                    itype="wifi"
                    ;;

                ww*)
                    itype="wwan"
                    ;;

                *)
                    itype="unknown"
                    ;;
            esac
        fi
    fi

    # save interface type (up action)
    [ "$action" = "up" ] && save_iface_type "$iface" "$itype"

    echo_debug "nm" "rdw_nm($iface).$action: type=$itype [nmcli]"

else
    # nmcli is not available
    itype="unknown"
    echo_debug "nm" "rdw_nm($iface)$action: type=$itype [none]"
fi

case $action in
    up) # interface up, disable configured interfaces

        case $itype in
            *ethernet)
                check_switch_lock LAN "$DEVICES_TO_DISABLE_ON_LAN_CONNECT" off
                ;;

            *wireless|wifi)
                check_switch_lock wifi "$DEVICES_TO_DISABLE_ON_WIFI_CONNECT" off
                ;;

            gsm|wwan)
                check_switch_lock wwan "$DEVICES_TO_DISABLE_ON_WWAN_CONNECT" off
                ;;
        esac
        ;; # up

    down) # interface down, enable configured interfaces
        case $itype in
            *ethernet)
                check_switch_lock LAN "$DEVICES_TO_ENABLE_ON_LAN_DISCONNECT" on
                ;;

            *wireless|wifi)
                check_switch_lock wifi "$DEVICES_TO_ENABLE_ON_WIFI_DISCONNECT" on
                ;;

            gsm|wwan)
                check_switch_lock wwan "$DEVICES_TO_ENABLE_ON_WWAN_DISCONNECT" on
                ;;
        esac
        ;; # down

esac

do_exit 0