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+# FTP - File Transfer Protocol - RFC 959
+# Pattern attributes: great notsofast fast
+# Protocol groups: document_retrieval ietf_internet_standard
+# Wiki: http://protocolinfo.org/wiki/FTP
+# Copyright (C) 2008 Matthew Strait, Ethan Sommer; See ../LICENSE
+#
+# Usually runs on port 21.  Note that the data stream is on a dynamically
+# assigned port, which means that you will need the FTP connection 
+# tracking module in your kernel to usefully match FTP data transfers.
+# 
+# This pattern is well tested.
+#
+# Handles the first two things a server should say:
+#
+# First, the server says it's ready by sending "220".  Most servers say 
+# something after 220, even though they don't have to, and it usually 
+# includes the string "ftp" (l7-filter is case insensitive). This 
+# includes proftpd, vsftpd, wuftpd, warftpd, pureftpd, Bulletproof FTP 
+# Server, and whatever ftp.microsoft.com uses.  Almost all servers use only 
+# ASCII printable characters between the "220" and the "FTP", but non-English
+# ones might use others.
+# 
+# The next thing the server sends is a 331.  All the above servers also 
+# send something including "password" after this code.  By default, we 
+# do not match on this because it takes another packet and is more work 
+# for regexec.
+
+ftp
+# by default, we allow only ASCII
+^220[\x09-\x0d -~]*ftp
+
+# This covers UTF-8 as well 
+#^220[\x09-\x0d -~\x80-\xfd]*ftp
+
+# This allows any characters and is about 4x faster than either of the above 
+# (which are about the same as each other)
+#^220.*ftp
+
+# This is much slower
+#^220[\x09-\x0d -~]*ftp|331[\x09-\x0d -~]*password
+
+# This pattern is more precise, but takes longer to match. (3 packets vs. 1)
+#^220[\x09-\x0d -~]*\x0d\x0aUSER[\x09-\x0d -~]*\x0d\x0a331
+
+# same as above, but slightly less precise and only takes 2 packets.
+#^220[\x09-\x0d -~]*\x0d\x0aUSER[\x09-\x0d -~]*\x0d\x0a