#!/bin/sh
#----------------------------------------------------------------------------
# /etc/rc.d/rc005.net-prefix.ula
#
# Last Update:  $Id$
#----------------------------------------------------------------------------

if [ "$OPT_NET_PREFIX_ULA" = "yes" ]
then

begin_script NET_PREFIX_ULA "registration of ULA prefixes..."

#----------------------------------------------------------------------------
# Generates a ULA prefix (size /48) from an EUI-64 interface identifier.
#
# $1     = EUI-64 interface identifier without colons
# output = ULA prefix (size /48)
#----------------------------------------------------------------------------
get_ula_prefix_from_eui64()
{
    [ -n "$1" ] || return 1
    local id=$(printf "%s%s" "$(date +%s%N)" "$1" | sha1sum | cut -d' ' -f1)
    echo "fd${id:30:2}:${id:32:4}:${id:36:4}::/48"
}

#----------------------------------------------------------------------------
# Generates a ULA prefix (size /48) from an Ethernet MAC address.
#
# $1     = Ethernet MAC address with colons
# output = ULA prefix (size /48)
#----------------------------------------------------------------------------
get_ula_prefix_from_ethernet_mac_address()
{
    get_ula_prefix_from_eui64 "$(get_eui64_from_ethernet_mac_address "$1")"
}

map2persistent NET_PREFIX_ULA_SAVEDIR

for i in $(seq 1 ${NET_PREFIX_N:-0})
do
    eval type=\$NET_PREFIX_${i}_TYPE
    if [ "$type" = "generated-ula" ]
    then
        eval name=\$NET_PREFIX_${i}_NAME
        ula=

        if [ -f "$NET_PREFIX_ULA_SAVEDIR/$name" ]
        then
            read ula < "$NET_PREFIX_ULA_SAVEDIR/$name"
            if [ -z "$ula" ]
            then
                log_warning "  ULA for 'NET_PREFIX_${i}' could not be restored, will generate a new one"
            fi
        fi

        if [ -z "$ula" ]
        then
            log_info "  trying to generate ULA for 'NET_PREFIX_${i}'"

            eval dev=\$NET_PREFIX_${i}_ULA_DEV
            mac=$(get_mac_address_from_ethernet_interface "$dev")
            if [ -z "$mac" ]
            then
                log_error "  network interface '$dev' referenced by NET_PREFIX_${i}_ULA_DEV unknown or not an Ethernet device, ignoring 'NET_PREFIX_${i}'"
                continue
            fi

            ula=$(get_ula_prefix_from_ethernet_mac_address "$mac")
            if [ -z "$ula" ]
            then
                log_error "  ULA generation failed for network interface '$dev' with MAC address '$mac', ignoring 'NET_PREFIX_${i}'"
                continue
            fi
        fi

        if [ ! -f "$NET_PREFIX_ULA_SAVEDIR/$name" ]
        then
            mkdir -p "$NET_PREFIX_ULA_SAVEDIR"
            echo "$ula" > "$NET_PREFIX_ULA_SAVEDIR/$name"
        fi

        log_info "  $name --> $ula"
        circuit_register_prefix "$name" ipv6 "$ula" forever forever
    fi
done

end_script

fi