ddns-scripts: allow setting CloudFlare 'rec_id' in the config

This is necessary when there are multiple records for the same domain,
otherwise the script will overwrite the first one returned by the API.
It has the secondary benefit of allowing faster updates by performing
only one API call instead of two.

In case 'rec_id' is not set the script behaves exactly as before.

Signed-off-by: Leonardo Brondani Schenkel <leonardo@schenkel.net>

net/ddns-scripts/files/update_CloudFlare.sh

@@ -57,55 +57,57 @@ cleanup() {
 	sed -i "#'##g" $DATFILE				# remove "'" (single quote)
 }
 
-# build url according to cloudflare client api at https://www.cloudflare.com/docs/client-api.html
-# to "rec_load_all" to detect rec_id needed for update
-__URL="https://www.cloudflare.com/api_json.html"	# https://www.cloudflare.com/api_json.html
-__URL="${__URL}?a=rec_load_all"				#  -d 'a=rec_load_all'
-__URL="${__URL}&tkn=$password"				#  -d 'tkn=8afbe6dea02407989af4dd4c97bb6e25'
-__URL="${__URL}&email=$username"			#  -d 'email=sample@example.com'
-__URL="${__URL}&z=$__DOMAIN"				#  -d 'z=example.com'
-
-# lets request the data
-do_transfer "$__URL" || return 1
-
-cleanup				# cleanup dat file
-json_load "$(cat $DATFILE)"	# lets extract data
-__FOUND=0			# found record indicator
-json_get_var __RES "result"	# cloudflare result of last request
-json_get_var __MSG "msg"	# cloudflare error message
-[ "$__RES" != "success" ] && {
-	write_log 4 "'rec_load_all' failed with error: \n$__MSG"
-	return 1
-}
-
-json_select "response"
-json_select "recs"
-json_select "objs"
-json_get_keys __KEYS
-for __KEY in $__KEYS; do
-	local __ZONE __DISPLAY __NAME __TYPE
-	json_select "$__KEY"
-#	json_get_var __ZONE "zone_name"		# for debugging
-#	json_get_var __DISPLAY "display_name"	# for debugging
-	json_get_var __NAME "name"
-	json_get_var __TYPE "type"
-	if [ "$__NAME" = "$domain" ]; then
-		# we must verify IPv4 and IPv6 because there might be both for the same host
-		[ \( $use_ipv6 -eq 0 -a "$__TYPE" = "A" \) -o \( $use_ipv6 -eq 1 -a "$__TYPE" = "AAAA" \) ] && {
-			__FOUND=1	# mark found
-			break		# found leave for loop
-		}
-	fi
-	json_select ..
-done
-[ $__FOUND -eq 0 ] && {
-	# we don't need to continue trying to update cloudflare because record to update does not exist
-	# user has to setup record first outside ddns-scripts
-	write_log 14 "No valid record found at Cloudflare setup. Please create first!"
+[ -n "$rec_id" ] && __RECID="$rec_id" || {
+	# build url according to cloudflare client api at https://www.cloudflare.com/docs/client-api.html
+	# to "rec_load_all" to detect rec_id needed for update
+	__URL="https://www.cloudflare.com/api_json.html"	# https://www.cloudflare.com/api_json.html
+	__URL="${__URL}?a=rec_load_all"				#  -d 'a=rec_load_all'
+	__URL="${__URL}&tkn=$password"				#  -d 'tkn=8afbe6dea02407989af4dd4c97bb6e25'
+	__URL="${__URL}&email=$username"			#  -d 'email=sample@example.com'
+	__URL="${__URL}&z=$__DOMAIN"				#  -d 'z=example.com'
+
+	# lets request the data
+	do_transfer "$__URL" || return 1
+
+	cleanup				# cleanup dat file
+	json_load "$(cat $DATFILE)"	# lets extract data
+	__FOUND=0			# found record indicator
+	json_get_var __RES "result"	# cloudflare result of last request
+	json_get_var __MSG "msg"	# cloudflare error message
+	[ "$__RES" != "success" ] && {
+		write_log 4 "'rec_load_all' failed with error: \n$__MSG"
+		return 1
+	}
+
+	json_select "response"
+	json_select "recs"
+	json_select "objs"
+	json_get_keys __KEYS
+	for __KEY in $__KEYS; do
+		local __ZONE __DISPLAY __NAME __TYPE
+		json_select "$__KEY"
+	#	json_get_var __ZONE "zone_name"		# for debugging
+	#	json_get_var __DISPLAY "display_name"	# for debugging
+		json_get_var __NAME "name"
+		json_get_var __TYPE "type"
+		if [ "$__NAME" = "$domain" ]; then
+			# we must verify IPv4 and IPv6 because there might be both for the same host
+			[ \( $use_ipv6 -eq 0 -a "$__TYPE" = "A" \) -o \( $use_ipv6 -eq 1 -a "$__TYPE" = "AAAA" \) ] && {
+				__FOUND=1	# mark found
+				break		# found leave for loop
+			}
+		fi
+		json_select ..
+	done
+	[ $__FOUND -eq 0 ] && {
+		# we don't need to continue trying to update cloudflare because record to update does not exist
+		# user has to setup record first outside ddns-scripts
+		write_log 14 "No valid record found at Cloudflare setup. Please create first!"
+	}
+	json_get_var __RECID "rec_id"	# last thing to do get rec_id
+	json_cleanup			# cleanup
+	write_log 7 "rec_id '$__RECID' detected for host/domain '$domain'"
 }
-json_get_var __RECID "rec_id"	# last thing to do get rec_id
-json_cleanup			# cleanup
-write_log 7 "rec_id '$__RECID' detected for host/domain '$domain'"
 
 # build url according to cloudflare client api at https://www.cloudflare.com/docs/client-api.html
 # for "rec_edit" to update IP address