#!/bin/sh
# SPDX-License-Identifier: GPL-3.0
#
# freifunk-franken dns-scipts (c) 2016      mayosemmel
#                             (c) 2020-2021 Fabian Bläse
#                             (c) 2021      Blackyfff

# exit script when command fails
set -e

export DNSSCRIPT_VERSION="0.9.2"

. /etc/ffdns/community.conf
. /etc/ffdns/local.conf

export DNSSCRIPT_CONTACT_EMAIL
export DNSSCRIPT_SERVER_NAME
export DNSSCRIPT_BIND_RELOAD_VER

cd /usr/lib/ffdns/
. ./dns-functions.sh
. ./update-dns-functions.sh

MasterDomain="$CommunityDomain"
[ -z "$SubCommunityDomain" ] || MasterDomain="$SubCommunityDomain"".""$MasterDomain"
if [ -n "$CommunityExternPrefix" ];then
	MasterExternDomain="$CommunityExternPrefix"".""$CommunityDomain"
	[ -z "$SubCommunityDomain" ] || MasterExternDomain="$SubCommunityDomain"".""$MasterExternDomain"
fi

FirstInternalView="$( echo "$InternalViews" | sed -e 's/\s.*//')"
# ForwardZones: "<Zone>/<Zonendatei>" ; optionaly multiple " ""<ZoneX>/<ZonendateiX>" no spaces in full filename
ForwardZones="$MasterDomain""/""$ZoneFilesFolder""db.""$FirstInternalView"".""$MasterDomain"
BindIcvpnAclTmp="$TempFolder""icvpn-acl.conf"
BindIcvpnAcl="$GeneratedIncludeFileFolder""icvpn-acl.conf"
[ -n "$DNSSECPolicy" ] || DNSSECKeyFolder=""

SetupCache

CachedMasterFile="$TempFolder""cache/db.""$MasterDomain"
PreFetchMasterSerial="$(GetZoneFileSerial "$CachedMasterFile")"
GetMasterFile
PostFetchMasterSerial="$(GetZoneFileSerial "$CachedMasterFile")"

ServeMasterZone="$(DoServeMasterZone)"

if [ -n "$ServeMasterZone" ] || [ -n "$(DoServeOnlyExternZone)" ]; then
	RemoveDNSSECKeysFromCacheFile

	if [ -n "$ServeMasterZone" ]; then
		MasterFile="$ZoneFilesFolder""db.""$FirstInternalView"".""$MasterDomain"
		FileForExternGeneration="$MasterFile"
	else
		FileForExternGeneration="$CachedMasterFile"
	fi

	if [ -n "$ExternalView" ]; then
		ExternFile="$ZoneFilesFolder""db.""$ExternalView"".""$MasterDomain"
	else
		ExternFile="$ZoneFilesFolder""db.extern.""$MasterDomain"
	fi
			
	SerialIntern="$(UpdateMasterZone)"
	
	InternalZoneFile="$FileForExternGeneration"
	ExternalZoneFile="$ExternFile"
	InternalDomain="$MasterDomain"
	ExternDomain="$MasterExternDomain"
	UpdateExternal
fi

if [ -z "$MasterFile" ]; then
	MasterFile="$ZoneFilesFolder""db.""$FirstInternalView"".""$MasterDomain"
	cp -f "$CachedMasterFile" "$MasterFile"
fi

UpdateReverseZones "$CommunitySubnets" "$ForwardZones" "$RemoteLocation"

# set shorter TTL for Hoods
TTLReReExMi="420 360 180 1800 360"

Hoods="$(GetOwnHoods "$MasterDomain" "$MasterFile")"
DNSSECKeyFolder=""
for Hood in $Hoods; do
	HoodDomain="${Hood%%\#*}"".""$MasterDomain"
	Subnets="$(echo "${Hood#*\#}" | sed -e 's/#/ /g')"
	HoodZoneFile="$ZoneFilesFolder""db.""$FirstInternalView"".""$HoodDomain"
	if [ ! -f "$HoodZoneFile" ]; then
		{
			echo "\$TTL ${TTLReReExMi%% *}"
			echo "@                                    IN SOA    $DNSSCRIPT_SERVER_NAME""."" $DNSSCRIPT_CONTACT_EMAIL ("
			echo "                                     1         ; Serial"
			echo "                                     ""$(echo "$TTLReReExMi" | awk '{print $2}')""       ; Refresh"
			echo "                                     ""$(echo "$TTLReReExMi" | awk '{print $3}')""       ; Retry"
			echo "                                     ""$(echo "$TTLReReExMi" | awk '{print $4}')""      ; Expire"
			echo "                                     ""$(echo "$TTLReReExMi" | awk '{print $5}')"" )     ; Negative Cache TTL"
			echo ";"
			echo "@                                    IN NS     ""$DNSSCRIPT_SERVER_NAME""."""
			GetOwnGlueRecords "$MasterDomain" "$HoodDomain" "$MasterFile"
			echo ";"
		} > "$HoodZoneFile"
	fi
	ZoneTempFolder="$TempFolder""cache/""$HoodDomain""/"
	./update-hoodzone.sh "$HoodZoneFile" "$HoodDomain" "$Subnets" "$InternalViews" "$ZoneTempFolder" "$ZoneFilesFolder"
	
	InsertZoneToViews "$InternalViews" "$ZoneFilesFolder" "$HoodDomain" "$HoodZoneFile" "$TempFolder" "$DNSSECPolicy"
	
	HoodForwardZones="$ForwardZones $HoodDomain""/""$HoodZoneFile"
	UpdateReverseZones "$Subnets" "$HoodForwardZones"

	if [ -n "$MasterExternDomain" ]; then
		HoodExternDomain="${Hood%%\#*}"".""$MasterExternDomain"
	else
		HoodExternDomain=""
	fi
	
	if [ -n "$ExternalView" ]; then
		ExternFile="$ZoneFilesFolder""db.""$ExternalView"".""$HoodDomain"
	elif [ -n "$HoodExternDomain" ]; then
		ExternFile="$ZoneFilesFolder""db.""$HoodExternDomain"
	else
		ExternFile=""
	fi
	
	if [ -n "$ExternFile" ]; then
		if [ -n "$ExternalView" ]; then
			InsertZoneToIncludeFile "$HoodDomain" "$ExternFile" "$TempFolder""$ExternalView"".conf" "$DNSSECPolicy"
		fi
		InternalZoneFile="$HoodZoneFile"
		ExternalZoneFile="$ExternFile"
		InternalDomain="$HoodDomain"
		ExternDomain="$HoodExternDomain"
		SerialIntern="$(GetZoneFileSerial "$InternalZoneFile")"
		UpdateExternal
	fi
done

./update-public-acl.sh "$BindIcvpnAclTmp" "$RemoteLocation" "$RoutingTables"

ReConfigBind=0
UpdateBindConfig() {
	if [ -f "$1" ] && ! cmp -s "$1" "$2"; then
		mv "$1" "$2"
		ReConfigBind=1
	else
		rm -f "$1"
	fi
}

UpdateBindConfig "$BindIcvpnAclTmp" "$BindIcvpnAcl"
for IView in $InternalViews; do
	UpdateBindConfig "$TempFolder""$IView"".conf" "$GeneratedIncludeFileFolder""$IView"".conf"
done
if [ -n "$ExternalView" ]; then
	UpdateBindConfig "$TempFolder""$ExternalView"".conf" "$GeneratedIncludeFileFolder""$ExternalView"".conf"
fi

if [ $ReConfigBind -ne 0 ] || [ -f "/tmp/dnsscript-forcereconf" ]; then
	if [ $((DNSSCRIPT_BIND_RELOAD_VER)) -eq 0 ]; then
		systemctl restart bind9
	elif [ $((DNSSCRIPT_BIND_RELOAD_VER)) -eq 1 ]; then
		rndc reconfig
	elif [ $((DNSSCRIPT_BIND_RELOAD_VER)) -eq 2 ]; then
		/etc/init.d/named restart
	fi
	rm -f "/tmp/dnsscript-forcereconf"
fi