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# Yahoo messenger - an instant messenger protocol - http://yahoo.com
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# Pattern attributes: good fast fast
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# Protocol groups: chat proprietary
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# Wiki: http://www.protocolinfo.org/wiki/Yahoo_Messenger
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# Copyright (C) 2008 Matthew Strait, Ethan Sommer; See ../LICENSE
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#
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# Usually runs on port 5050
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#
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# This pattern has been tested and is believed to work well.
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yahoo
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# http://www.venkydude.com/articles/yahoo.htm says:
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# All Yahoo commands start with YMSG.
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# (Well... http://ethereal.com/faq.html#q5.32 suggests that YPNS and YHOO
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# are also possible, so let's allow those)
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# The next 7 bytes contain command (packet?) length and version information
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# which we won't currently try to match.
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# L means "YAHOO_SERVICE_VERIFY" according to Ethereal
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# W means "encryption challenge command" (YAHOO_SERVICE_AUTH)
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# T means "login command" (YAHOO_SERVICE_AUTHRESP)
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# (there are others, i.e. 0x01 "coming online", 0x02 "going offline",
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# 0x04 "changing status to available", 0x06 "user message", but W and T
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# should appear in the first few packets.)
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# 0xC080 is the standard argument separator, it should appear not long
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# after the "type of command" byte.
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^(ymsg|ypns|yhoo).?.?.?.?.?.?.?[lwt].*\xc0\x80
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