Return weird if a log line is over a configurable size limit

scripts/base/init-bare.zeek

@@ -2901,7 +2901,20 @@ export {
 		auth_flavors: vector of auth_flavor_t &optional;	##< Returned authentication flavors
 	};
 
-} # end export
+}
+
+module Log;
+
+export {
+	## Maximum size of a message that can be sent to a remote logger or logged
+	## locally. If this limit is met, report a ``log_line_too_large`` weird and drop
+	## the log entry. This isn't necessarily the full size of a line that might be
+	## written to a log, but a general representation of the size as the log record is
+	## serialized for writing. The size of end result from serialization might be
+	## higher than this limit, but it prevents runaway-sized log entries from causing
+	## problems.
+	const max_log_record_size = 1024*1024*64 &redef;
+}
 
 module POP3;