#!/bin/sh
# SPDX-License-Identifier: GPL-3.0
#
# freifunk-franken dns-scipts (c) 2021-2023 Blackyfff

SetupCache() {
	mkdir -p "$DNSSCRIPT_TEMP_FOLDER""cache"

	for IView in $InternalViews; do
		rm -f "$DNSSCRIPT_TEMP_FOLDER""$IView"".conf"
	done
	rm -f "$DNSSCRIPT_TEMP_FOLDER""$ExternalView"".conf"
}
GetMasterFile() {
	curl -s -S -f "$RemoteLocation""db.""$MasterDomain" --output "$CachedMasterFile" && \
		[ -f "$CachedMasterFile" ] && \
		{
			echo ""
			echo "_dnsscript_version	IN TXT	""$DNSSCRIPT_VERSION" | NormalizeZoneFileFormatting
		} >> "$CachedMasterFile" || :
	if [ ! -f "$CachedMasterFile" ]; then
		cp -f "$ZoneFilesFolder""db.""$FirstInternalView"".""$MasterDomain" "$CachedMasterFile"
		sed -i -e '/^_dnsscript_version.*/,$d' "$CachedMasterFile"
		echo "_dnsscript_version	IN TXT	""$DNSSCRIPT_VERSION" | NormalizeZoneFileFormatting >> "$CachedMasterFile"
	fi
}
DoServeMasterZone() {
	[ -n "$SubCommunityDomain" ] || \
	GetAllZoneNameservers "$MasterDomain" "$CachedMasterFile" | \
	awk '{for(i=NF;i>0;--i) if($i=="'"$DNSSCRIPT_SERVER_NAME"'") {printf 1}}'
}
DoServeOnlyExternZone() {
	if [ -n "$MasterExternDomain" ] && [ -z "$ServeMasterZone" ]; then
		GetAllSubNameservers "$CommunityDomain" "$CommunityExternPrefix" "$CachedMasterFile" | \
		awk '{for(i=NF;i>0;--i) if($i=="'"$DNSSCRIPT_SERVER_NAME"'") {printf 1}}'
	fi
}
RemoveDNSSECKeysFromCacheFile() {
	sed -i -e '/^\s*_dnsseckeys\./d' "$CachedMasterFile"
	sed -i -e '/^\s*_cdskey\./d' "$CachedMasterFile"
}
UpdateMasterZone() {
	LocalMasterSerial=$((PostFetchMasterSerial))
	if [ -n "$ServeMasterZone" ]; then
		ZoneTempFolder="$DNSSCRIPT_TEMP_FOLDER""cache/""$MasterDomain""/"
	
		UpdateMaster="$(UpdateDNSSECEntryCache "$MasterDomain" "$ZoneTempFolder" "$CachedMasterFile" "$DNSSECKeyFolder" "$InternalUpstreamIP" )"
		
		if [ $((PostFetchMasterSerial)) -gt $((PreFetchMasterSerial)) ] || [ -n "$UpdateMaster" ] || [ ! -f "$MasterFile" ]; then
			cp -f "$CachedMasterFile" "$CachedMasterFile""I"
			for KeyFile in "$ZoneTempFolder"*; do
				[ "$KeyFile" = "$ZoneTempFolder""*" ] || \
				cat "$KeyFile" >> "$CachedMasterFile""I"
			done
			LocalMasterSerial="$(GetZoneFileSerial "$MasterFile")"
			
			if [ $((PostFetchMasterSerial)) -le $((LocalMasterSerial)) ]; then
				LocalMasterSerial=$((LocalMasterSerial+1))
				sed -i -e 's/^\(\s*\)'"$PostFetchMasterSerial"'\(\s*;\s*[Ss]erial.*\)$/\1'"$LocalMasterSerial"'\2/g' "$CachedMasterFile""I"
				sed -i -e 's/^\(\s*\S\+\s\+\([0-9]*\s\)\?\s*[Ii][Nn]\s\+[Ss][Oo][Aa]\s\+\S\+\s\+\S\+\s\+\)'"$PostFetchMasterSerial"'\(\s\+.*\)$/\1'"$LocalMasterSerial"'\3/g' "$CachedMasterFile""I"
			else
				LocalMasterSerial=$((PostFetchMasterSerial))
			fi
			awk '/^$/ || !a[$0]++' "$CachedMasterFile""I" > "$MasterFile"
			ReloadZone "$MasterDomain" "$InternalViews" "$ZoneFilesFolder"
			
		fi
		
		InsertZoneToViews "$InternalViews" "$ZoneFilesFolder" "$MasterDomain" "$MasterFile"
	fi

	echo "$LocalMasterSerial"
}
UpdateExternal() {
	CachedZoneFile="$DNSSCRIPT_TEMP_FOLDER""cache/db.""$InternalDomain""E"

	UpdateExternView=0
	if [ -n "$ExternalView" ] || [ -n "$ExternDomain" ]; then
		SerialExtern="$(GetZoneFileSerial "$ExternalZoneFile")"
		if [ $((SerialIntern)) -gt $((SerialExtern)) ]; then
			sed -e '/^[^;]*\s\(10\.\|[fF][cdCD][0-9a-fA-F]\{2\}:\)\S*\s*\(;.*\)\?$/d;s/^[^;^@]*\s\+\([^;]*\)\s[Ii][Nn]\s\+[Ss][Oo][Aa]\s/@                         \1 IN SOA /g' "$InternalZoneFile" \
			> "$ExternalZoneFile"
			UpdateExternView=1
			ReloadZone "$InternalDomain" "$ExternalView" "$ZoneFilesFolder"
		fi
		
		if [ -n "$ExternalView" ]; then
			InsertZoneToViews "$ExternalView" "$ZoneFilesFolder" "$InternalDomain" "$InternalZoneFile"
		fi
	fi

	if [ -n "$ExternDomain" ]; then
		ExtDomainFile="$ZoneFilesFolder""db.""$FirstInternalView"".""$ExternDomain"
		ZoneTempFolder="$DNSSCRIPT_TEMP_FOLDER""cache/""$ExternDomain""/"
		named-checkzone -q -i none -o "$CachedZoneFile" "$InternalDomain" "$ExternalZoneFile"
		InternalDomainSed="$(SEDifyHostname "$InternalDomain")"
		ExternDomainSed="$(SEDifyHostname "$ExternDomain")"
		
		if [ -n "$(sed -e '/^'"$ExternDomainSed"'\.\s\+\([0-9]*\s\)\?\s*[Ii][Nn]\s\+[Nn][Ss]\s/!d' "$CachedZoneFile")" ]; then
			sed -i -e '/^'"$InternalDomainSed"'\.\s\+\([0-9]*\s\)\?\s*[Ii][Nn]\s\+[Nn][Ss]\s/d' "$CachedZoneFile"
			sed -i -e 's/^'"$ExternDomainSed"'\.\(\s\)/@\1/g' "$CachedZoneFile"
		fi
		if [ -n "$DNSSECKeyFolder" ]; then
			sed -i -e '/^_cdskey\./d' "$CachedZoneFile"
			sed -i -e '/^\S\+\s\+\([0-9]*\s\)\?\s*[Ii][Nn]\s\+[Dd][Nn][Ss][Kk][Ee][Yy]/d' "$CachedZoneFile"
		fi
		
		[ -n "$(sed -e '/^\s*\(@\s\+\([0-9]*\s\)\?\s*[Ii][Nn]\s\+[Nn][Ss]\)\s/!d' "$CachedZoneFile")" ] || \
			sed -i -e 's/^\s*\(@\s\+\([0-9]*\s\)\?\s*[Ii][Nn]\s\+[Ss][Oo][Aa]\)\s\+\S\+\s\+\S\+\s/\1 '"$DNSSCRIPT_SERVER_NAME"'. '"$DNSSCRIPT_CONTACT_EMAIL"' /g' "$CachedZoneFile"
		
		sed -i -e '/^\S\+\s\+\([0-9]*\s\)\?\s*[Ii][Nn]\s\+[Dd][Ss]\s/d' "$CachedZoneFile"
		sed -i -e '/^_dnsseckeys\./d' "$CachedZoneFile"
		sed -i -e 's/^'"$InternalDomainSed"'\.\(\s\)/@\1/g' "$CachedZoneFile"
		sed -i -e 's/^\(\S\+\)\.'"$InternalDomainSed"'\.\(\s\)/\1\2/g' "$CachedZoneFile"
		
		echo "\$TTL ${TTLReReExMi%% *}" >> "$CachedZoneFile"
		
		UpdateExternDomain="$(UpdateDNSSECEntryCache "$ExternDomain" "$ZoneTempFolder" "$CachedZoneFile" "$DNSSECKeyFolder" "$InternalUpstreamIP" )"
	
		if [ $UpdateExternView -ne 0 ] || [ -n "$UpdateExternDomain" ]; then
			for KeyFile in "$ZoneTempFolder"*; do
				[ "$KeyFile" = "$ZoneTempFolder""*" ] || \
				cat "$KeyFile" >> "$CachedZoneFile"
			done
			LocalExtDomainMasterSerial="$(GetZoneFileSerial "$ExtDomainFile")"
			
			if [ $((SerialIntern)) -le $((LocalExtDomainMasterSerial)) ]; then
				LocalExtDomainMasterSerial=$((LocalExtDomainMasterSerial+1))
				sed -i -e 's/^\(\s*\)'"$SerialIntern"'\(\s*;\s*[Ss]erial.*\)$/\1'"$LocalExtDomainMasterSerial"'\2/g' "$CachedZoneFile"
				sed -i -e 's/^\(\s*\S\+\s\+\([0-9]*\s\)\?\s*[Ii][Nn]\s\+[Ss][Oo][Aa]\s\+\S\+\s\+\S\+\s\+\)'"$SerialIntern"'\(\s\+.*\)$/\1'"$LocalExtDomainMasterSerial"'\3/g' "$CachedZoneFile"
			fi
			awk '/^$/ || !a[$0]++' "$CachedZoneFile" > "$ExtDomainFile"
			ReloadZone "$ExternDomain" "$InternalViews" "$ZoneFilesFolder"
			ReloadZone "$ExternDomain" "$ExternalView" "$ZoneFilesFolder"
		fi
		InsertZoneToViews "$InternalViews" "$ZoneFilesFolder" "$ExternDomain" "$ExtDomainFile"
		InsertZoneToViews "$ExternalView" "$ZoneFilesFolder" "$ExternDomain" "$ExtDomainFile"
	fi
}
UpdateReverseZones() {
	for Subnet in $1; do
		ReverseDomains="$(GetReverseDomains "$Subnet")"
		for RDomain in $ReverseDomains; do
			ReverseZoneFile="$(GetReverseZoneFileFromZone "${RDomain%*.}")"
			if [ -n "$RemoteLocation" ]; then
				! curl -s -f "$RemoteLocation""static.""$ReverseZoneFile" \
					--output "$ZoneFilesFolder""static.""$ReverseZoneFile" && \
					rm -f "$ZoneFilesFolder""static.""$ReverseZoneFile"
			fi
			./update-rdnszone.sh "$RDomain" "$2" "$ZoneFilesFolder""$ReverseZoneFile" "$TTLReReExMi" "$InternalViews"
			for IView in $InternalViews; do
					InsertZoneToIncludeFile "${RDomain%*.}" "$ZoneFilesFolder""$ReverseZoneFile" "$DNSSCRIPT_TEMP_FOLDER""$IView"".conf"
			done
		done
	done
}