: ${net_alias_conf:=/var/run/netaliases.conf}
net_alias_init()
{
    [ ! -f $net_alias_conf ] && \
        echo "net_aliases_loaded=yes" > $net_alias_conf
}
#
# net_alias_add name device [ prefix ]
#
net_alias_add() 
{
    local name="$1"
    local dev="$2"
    local pf="$3"
    local rname=`echo "$name" | tr ' .+-' '____'`
    local rdev=`echo  "$dev" | tr ' .+-' '____'`

    eval "net_${pf}dev_$rname=\"$dev\""
    eval "net_${pf}name_$rdev=\"$name\""
    {
        echo "net_${pf}dev_$rname='$dev'"
        echo "net_${pf}name_$rdev='$name'" 
    } >>$net_alias_conf
}
net_alias_del() 
{
    local rname=`echo "$1" | tr ' .+-' '____'`
    sed -i -e "/^net_dev_$rname=/d;/^net_name_.*='$1'/d" $net_alias_conf
}
net_alias_lookup()
{
    if [ ! "$net_aliases_loaded" ]; then
        . $net_alias_conf
    fi
    local postfix=`echo "$2" | tr ' .+-' '____'`
    eval local tmp=\"\$net_$4$1_$postfix\"
    if [ "$tmp" ]; then
       eval $3="\"$tmp\""
       return 0
    fi
    return 1
}
net_alias_lookup_dev()
{
    net_alias_lookup dev "$1" $2 $3
}
net_alias_lookup_name()
{
    net_alias_lookup name "$1" $2 $3
}