/etc/l7-protocols/protocols/tsp.pat is in l7-protocols 20090528-4.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 | # TSP - Berkely UNIX Time Synchronization Protocol
# Pattern attributes: good veryfast fast overmatch
# Protocol groups: time_synchronization open_source
# Wiki: http://www.protocolinfo.org/wiki/TSP
# Copyright (C) 2008 Matthew Strait, Ethan Sommer; See ../LICENSE
#
# http://ftp.svbug.com/ftp/pub/manuals/pdf/smm.22.timed.pdf
# http://docs.freebsd.org/44doc/smm/12.timed/paper.pdf
#
# This pattern is barely tested.
tsp
# type, version (1), sequence number, 8 type specific bytes, machine name
^[\x01-\x13\x16-$]\x01.?.?.?.?.?.?.?.?.?.?[ -~]+
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