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# MSN Messenger - Microsoft Network chat client
# Pattern attributes: good slow notsofast
# Protocol groups: chat proprietary
# Wiki: http://www.protocolinfo.org/wiki/MSN_Messenger
#
# Usually uses TCP port 1863
# http://www.hypothetic.org/docs/msn/index.php
# http://msnpiki.msnfanatic.com/
#
# This pattern has been tested and is believed to work well.
msnmessenger
# First branch: login
# ver: allow versions up to 99.
# I've never seen a cvr other than cvr0. Maybe this will be trouble later?
# Can't anchor at the beginning because sometimes this is encapsulated in
# HTTP. But either way, the first packet ends like this.
# Second/Third branches: accepting/sending a message
# I will assume that these can also be encapsulated in HTTP, although I have
# not checked. Example of each direction:
# ANS 1 quadong@hotmail.com 1139803431.29427 17522047
# USR 1 quadong@hotmail.com 530423708.968145.366138
# Branches are written entirely separately for better performance.
ver [0-9]+ msnp[1-9][0-9]? [\x09-\x0d -~]*cvr0\x0d\x0a$|usr 1 [!-~]+ [0-9. ]+\x0d\x0a$|ans 1 [!-~]+ [0-9. ]+\x0d\x0a$
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