## /usr/lib/network/globals needs to be sourced before this file


## Determine the system interface of an rfkill device
# $1: interface name
# $2: rfkill name
rf_get_path() {
    local interface=$1 rfkill_name=${2:-auto} path

    if [[ $rfkill_name == "auto" ]]; then
        path=$(find -L "/sys/class/net/$interface/" -maxdepth 2 -type d -name "rfkill*" 2> /dev/null | head -n 1)
        if [[ $path ]]; then
            echo "$path"
            return 0
        fi
        report_error "No rfkill switch available on interface '$interface'"
    else
        for path in /sys/class/rfkill/*; do
            if [[ $(< "$path/name") == "$rfkill_name" ]]; then
                echo "$path"
                return 0
            fi
        done
        report_error "No rfkill switch with name '$rfkill_name'"
    fi
    return 1
}

## Determine the blocking status of an rfkill device
# $1: interface name
# $2: rfkill name
rf_status() {
    local path
    path=$(rf_get_path "$@") || return 1

    if (( $(< "$path/hard" ) )); then
        echo "hard"
    elif (( $(< "$path/soft" ) )); then
        echo "soft"
    fi
}

## Set the soft blocking status of an rfkill device
# $1: blocking status
# $2: interface name
# $3: rfkill name
rf_set() {
    local block=$1 path
    shift
    path=$(rf_get_path "$@") || return 1

    report_debug "${FUNCNAME[1]}: echo '$block' > '$path/soft'"
    echo "$block" > "$path/soft"
    timeout_wait 1 '(( $(< "$path/soft") == block ))'
}

## Block transmission through a wireless device
# $1: interface name
# $2: rfkill name
rf_disable() {
    rf_set 1 "$@"
}

## Unblock transmission through a wireless device
# $1: interface name
# $2: rfkill name
rf_enable() {
    local status
    status=$(rf_status "$@") || return 1

    case $status in
      hard)
        report_error "Transmission is hard-blocked on interface '$interface'"
        return 1
      ;;
      soft)
        rf_set 0 "$@"
      ;;
    esac
}


# vim: ft=sh ts=4 et sw=4: