Linux Manpages Online - man.cx manual pages

This is the engine of the TCPQuota system. It checks the files in ’/proc/net/’ for connects to the outside world and the mSQL tables ’allowed’ and ’masq’. The daemon closes a host if it is not listed in the mSQL table ’masq’, it kills a users processes if the user is not allowed to use the TCP link _OR_ if the user have gone below the minimum quota value.

NOTES

The following signals have the specified effect when sent to the server process using the kill(1) command:

SIGHUP
Causes server to reload the configuration file.

SIGTERM SIGINT SIGQUIT SIGKILL
Causes the server to clean the firewall entries
and the masquerading table from entries, and to
exit cleanly

SIGUSR1
Turns on debugging

SIGUSR2
Turns off debugging

MSQL TABLES

tcptab - This is the main quota table in the database, this contains the columns: name and quota.

name - contains the username of the user allowed
quota - contains the quota points of the user allowed This is measured in seconds.

allowed - This is the table that holds the username of the users that are allowed to use the ’Net link. A user can exist in the tcptab table without being registered here. This is so that one can turn off a user, without removing it’s points. It only contain one column: name.

name - contains the username of the user allowed

periodtab - xx

masq - This is the table that holds the information on which host’s and user’s that the firewall is opened for. If one, for example executes the program openfw without parameters, it checks the file /etc/tcpquota/tcpquota.cf for the lines:

		GROUPS=GROUP1
		GROUP1=xxx yyy zzz

Which means that there are one computer group (GROUP1) which contains the host’s xxx, yyy and zzz. If you have logged in on the firewall from host zzz it opens the host’s xxx, yyy and zzz for ’Net access for free (it depits the TCPQuota user ’free’, which does not need to be an existing system user). This user can go under any value you set for MIN_QUOTA in the config file. This table contains the columns: host, name, cnts, tic, counter, open and free

host - Is the IP nummer of the host that the firewall is opened for.
name - Is the username of the user that have opened the firewall for the specified host.
cnts - Number of connects for the specified host
tic - Number of ticks since the table was uppdated
counter - ....
open - This is for used by the support programs, openfw and openhost to trigger the opening/closing of the firewall.

	If the support programs write a:
	3 - means that the firewall should be closed.
	2 - means that it should be opened.
	And the daemon writes a:
	1 - the firewall is opened.
	0 - the firewall is closed.

free - This is 1 if the user is allowed free access to the link and 0 if not...

logging - Contains the logging about who have changed the TCPQuota database when...
This table contains the columns: when, user and action

when - Is the date when the database administrator have added/removed/changed quota points for another user
user - The name of the database administrator that have changed the database
action - What have the administrator done?

logging_openfw - Contains the logging about who have opened/closed the firewall for free/admin access when...
This table contains the columns: when, user and action

when - Is the date when the database administrator have opened/closed the firewall for access...
user - The name of the person that have opened/closed the firewall
action - What have the administrator done (opened/closed, which set of computers)?

MSQL EXAMPLE

Running msql (1) one can do:

SELECT quota FROM tcptab WHERE name LIKE ’free’\\g

And you’ll get something like this:

+----------+
| quota |
+----------+
| -1008888 |
+----------+

This is the number of quota points the user have left to spend... (In this perticular example, you’ll get a negative value, which means that this is how much the user have spend...)

		SELECT masq.host, tcptab.name, tcptab.quota FROM
		tcptab, masq WHERE masq.host LIKE ’42.42.40.66
		AND tcptab.name LIKE ’free’\\g

You’ll get an output something like this:

+-----------------+----------------------+----------+
| host | name | quota |
+-----------------+----------------------+----------+
| 42.42.40.66 | free | -1008888 |
+-----------------+----------------------+----------+

This means that the user free is allowed free access from host 42.42.40.66 and have accumulated a negative quota value of 1008888 points (seconds).

You naturally have to exchange the IP number and username to your values... For more information on how to use mSQL can be found in the manual page for msql.