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openwrt-xburst/package/iptables/files/l7/ntp.pat
nbd def1f28f94 add layer7 patterns to iptables-mod-filter
git-svn-id: svn://svn.openwrt.org/openwrt/trunk/openwrt@2519 3c298f89-4303-0410-b956-a3cf2f4a3e73
2005-11-18 16:17:27 +00:00

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# (S)NTP - (Simple) Network Time Protocol - RFCs 1305 and 2030
# Pattern quality: good veryfast overmatch
#
# This pattern is tested and is believed to work. If this does not work
# for you, or you believe it could be improved, please post to
# l7-filter-developers@lists.sf.net . Subscribe at
# http://lists.sourceforge.net/lists/listinfo/l7-filter-developers
# client|server
# Requires the server's timestamp to be in the present or future (of 2005).
# Tested with ntpdate on Linux.
# Assumes version 2, 3 or 4.
# Note that ntp packets are always 48 bytes, so you should match on that too.
ntp
^([\x13\x1b\x23\xd3\xdb\xe3]|[\x14\x1c$].......?.?.?.?.?.?.?.?.?[\xc6-\xff])