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mod_ratio.c - Ratio system module for ProFTPD - README

Copyright (c) 2002 James Dogopoulos <james@dynw.com>
Portions Copyright (c) 1998-1999 Johnie Ingram. <johnie@netgod.net>

-----------------------------------------------------------------------

LATEST CHANGES:

   * 2002-05-24: v3.3: Fixed numerous bugs and compatibility issues with
     changing code within ProFTPD. In other words, it /works/ again!
     Added default AnonRatio support (AnonRatio * ...).

-- See mod_ratio.c for previous version changes.


NOTES: 

SaveRatios, RatioFile, RatioTempFile:

In order to have SaveRatios working properly, you must point
RatioFile and RatioTempFile to files that are read/writable for all
users that you wish to have ratios saved. If there is a problem
accessing the files, ProFTPD will revert back to the old per session
ratio method (u/l d/l stats will be forgotten on disconnect).

touch and chmod both files to allow r/w from all users whos ratios
will be saved. Enable ratios, users are added to the ratios file as
they log in and stat tracking begins.

If you are using DefaultRoot along with this command, the Ratio files
will need to be stored within the Root directory. One easy way is to
create a sub-directory off of DefaultRoot that is rwx by all users
and then restrict ALL access to these directorys within ProFTPD...

	<Directory /workdir>
		<Limit ALL>
		Deny ALL
		</Limit>
	HideNoAccess
	</Directory>


INSTALLATION:

To install, cconfigure it with ProFTPD like so,
./configure --with-modules=mod_ratio

This module is inactive unless configured, which can be done with an
Anonymous, Directory, or VirtualHost block in proftpd.conf, or with a
.ftpaccess file. (Ratios must be turned on elsewhere for a directive in
.ftpaccess to take effect.)

If compiled with -DMOD_MYSQL_RATIOS, this module can get and set session
stats using mod_mysql, so the only directive needed is "Ratios on". This
acts like a weak "UserRatio" -- any directive described below can override
it. It also makes multiple concurrent uploads/downloads possible, with
persistent credits. See mod_mysql docs for setup details. Most ratio
directives take four numbers: file ratio, initial file credit, byte ratio,
and initial byte credit. Setting either ratio to 0 disables that check:
FooRatio bar [frate] [fcred] [brate] [bcred] The directives are HostRatio
(matches FQDN -- wildcards are allowed in this one), AnonRatio (matches
password entered in an anon login, usually an email address), UserRatio
(accepts "*" for 'any user'), and GroupRatio. Matches are looked for in
that order. Some examples:

Ratios on				# enable module

SaveRatios on				# Save ratios in plain text.
					  READ Above.

RatioFile "/path/tofile"		# Required for SaveRatios
RatioTempFile "/path/tofile"		# Required for SaveRatios

CwdRatioMsg "Please Upload!"		# Displayed after every directory
					  change.

UserRatio ftp 0 0 0 0
HostRatio master.debian.org 0 0 0 0 	# leech access (default)

GroupRatio proftpd 100 10 5 100000 	# 100:1 files, 10 file cred 5:1
					  bytes, 100k byte cred

AnonRatio billg@microsoft.com 1 0 1 0 	# 1:1 ratio, no credits
UserRatio * 5 5 5 5000			# special default case

FileRatioErrMsg "Come on you can send more files than that...."
ByteRatioErrMsg "This file is %i big, you know...."
LeechRatioMsg "Access: Unlimited"


UserRatio Directive Examples:

The UserRatio command controls the initial ratios and credits for all
users on the system. The format is:

UserRatio username FILERATIO FILECREDITS BYTERATIO BYTECREDITS(kB)

So "UserRatio * 0 0 3 10000" would give all users the default of
10000k bytes credit (9.7mb) and a 1:3 byte ratio, which will give the
user 3 bytes of creadit for every 1 byte uploaded.

Specifying a ratio as a negative number will swap the ratio, for
instance... "UserRatio jd 0 0 -3 0" would give the user jd a 3:1 byte
ratio, requiring jd to upload 3 bytes for every 1 byte he downloads.

Here's a multi-user anonymous ratio example:

AnonRatio                       james@dynw.com 0 0 3 50000
AnonRatio                       * 0 0 3 10000

If someone logs in with anonymous and gives the e-mail address of
james@dynw.com, they will get 48MB credit. Everyone else will get 9MB.
It's important to put the individual users BEFORE the global "*" command
directive or else they will not take effect.



MORE Notes:

Setting "Ratios on" without configuring anything else will enable leech
mode: it logs activity and sends status messages to the ftp client, but
doesn't restrict traffic. Ratio module activity is recorded to syslog at
DEBUG0; it usually shows up in /var/log/debug, like this: foo in /: CWD
/foo :-15/3450 +0/0 (my 5 15 5 15000) =0/146 [NO F] This example is
for someone who (1) has downloaded 15 files totalling 14mb, (2) has
uploaded nothing, (3) has a ratio of 5:1 files and 15:1 bytes, (4) has
0 files and 146k credit remaining, (5) got the ratio from the MySQL
record ("my") and (6) is changing directory from / to /foo. Note that
if this module is turned on globally, any user can create a personal
ratio area with a .ftpaccess file. One way to prevent this is with:
PathDenyFilter "\.ftpaccess$"


DISCLAIMER:

The authors of this module, this ProFTPD software, and this OS and
kernel disclaim all warranties and are not responsible for what random
users of this module may do.