Finally fix iptables -m conntrack (#988), bump release numnber

[openwrt.git] / package / iptables / files / l7 / ftp.pat

diff --git a/package/iptables/files/l7/ftp.pat b/package/iptables/files/l7/ftp.pat
index 9593ffd..a7f9e0e 100644 (file)
--- a/package/iptables/files/l7/ftp.pat
+++ b/package/iptables/files/l7/ftp.pat
@@ -1,30 +1,41 @@
 # FTP - File Transfer Protocol - RFC 959
 # FTP - File Transfer Protocol - RFC 959

-# Pattern quality: great fast
+# Pattern attributes: great notsofast fast
+# Protocol groups: document_retrieval ietf_internet_standard
+# Wiki: http://protocolinfo.org/wiki/FTP

 #
 # 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.
 # 
 #
 # 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.  If it does not
-# work for you, or you believe it could be improved, please post to 
-# l7-filter-developers@lists.sf.net .  This list may be subscribed to at
-# http://lists.sourceforge.net/lists/listinfo/l7-filter-developers
+# This pattern is well tested.

 #
 #

-# Matches the first two things a server should say.  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.  Just in case, the next 
-# thing the server sends is a 331.  All the above servers also send 
-# something including "password" after this code.
+# 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
 ftp

-# actually, let's just do the first for now, it's faster
+# by default, we allow only ASCII

 ^220[\x09-\x0d -~]*ftp
 
 ^220[\x09-\x0d -~]*ftp
 

-# This is ~10x faster if the stream starts with "220"
+# 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
 
 #^220.*ftp
 

-# This will match more, but much slower
+# 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 -~]*ftp|331[\x09-\x0d -~]*password
 
 # This pattern is more precise, but takes longer to match. (3 packets vs. 1)