#!/bin/bash

#
# bird-mkroa
# author: hexa-
#
# get updates from net.dn42.registry/utils/roa/
#

<<EOF

Load the ROA-Table from BIRD4_ROA_CFG like this:

	roa table dn42_roa {
		include "roa4.conf";
	};

Check in your filters like this:

	if (roa_check(dn42_roa, net, bgp_path.last) = ROA_INVALID) then {
		print "[dn42] ROA check failed for ", net, " ASN ", bgp_path.last;
		reject;
	}

EOF

#
# Configuration
#

REGISTRY="/etc/bird/registry"

BIRD4C=birdc
BIRD4_ROA_CFG="/var/lib/bird/bird_roa_dn42.conf"
BIRD4_MAX_PREFIXLEN=28

BIRD6C=birdc6
BIRD6_ROA_CFG="/var/lib/bird/bird6_roa_dn42.conf"
BIRD6_MAX_PREFIXLEN=64

#
# End of configuration
#

# check if git repository exists
if [ ! -d "$REGISTRY/.git" ]; then
	>&2 echo "registry directory does not exist;"
	exit 1
fi

pushd $REGISTRY
git pull
popd

function mkroa() {
	# based on utils/roa/genroa.sh by fritz@grimpen.net

	for i in $*
	do
		route=$(grep -E "route[6]?:" $i | tr -d '[:blank:]' | cut -d':' -f2-)
		origin=$(grep "origin:" $i | tr -d '[:blank:][:alpha:]' | cut -d':' -f2)
		if [ -z "$origin" -o -z "$route" -o -n "$(echo $as | tr -d '[:digit:]')" ]
		then
			>&2 echo "$i is invalid"
			continue
		fi
		prefixlen=$(echo $route | cut -d'/' -f2)
		if [ $MAX_PREFIXLEN -gt $prefixlen ]; then
			prefixlen=$MAX_PREFIXLEN
		fi

		while read -r asn
		do
			echo "roa $route max $prefixlen as $asn;"
		done <<< "$origin"
	done
}

MAX_PREFIXLEN=$BIRD4_MAX_PREFIXLEN mkroa $REGISTRY/data/route/* > $BIRD4_ROA_CFG
MAX_PREFIXLEN=$BIRD6_MAX_PREFIXLEN mkroa $REGISTRY/data/route6/* > $BIRD6_ROA_CFG

BIRD4_CHECK=$($BIRD4C configure check | grep error)
if [[ -z $BIRD4_CHECK ]]; then
	$BIRD4C configure >/dev/null
else
	>&2 echo $BIRD4_CHECK
fi

BIRD6_CHECK=$($BIRD6C configure check | grep error)
if [[ -z $BIRD6_CHECK ]]; then
	$BIRD6C configure >/dev/null
else
	>&2 echo $BIRD6_CHECK
fi