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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
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