Re: tcp wrappers and mysqld

Boyd Gerber <[email protected]>
Newsgroups gmane.comp.db.mysql.bugs
Message-ID <[email protected]>
Dear Jaco,

I need to ask more about your configuration of tcp wrappers

On Wed, 19 Nov 2003, Jaco Kroon wrote:
> We found a problem with MySQL that can cause serious problems when
> receiving connections from disallowed hosts.  On our systems we can
> produce the problem by following the following steps:
> 1.  Configure tcpwrappers to deny connections from everywhere to mysqld
> 2.  Configure MySQL to accept connections from the network.
> 3.  Start/Restart MySQL
> 4.  Connect from a disallowed host.
> 5.  Whilst the above is still "blocking" connect to MySQL on the machine
> itself.  It should block until 4 has finished.

Could you please provide the exact version of tcp wrappers and what OS you
are using.  Could you also show the exact commands used.  The details are
very important because I tried this on two machines and did not experience
any problem it worked exactly as tcp wrappers has always worked and I
experience not problems with MySQL.


> And number 5 is excactly the problem.  You would expect 4 to terminate
> almost immediately due to access denied or something and then to start
> authenticating 5.  Instead, it locks up.


Thanks for the report but I have been unable to duplicate your problem.

Sincerly,

-- 
Boyd Gerber, Software Engineeer & Support Specialist
MySQL AB, www.mysql.com

Are you MySQL certified?  www.mysql.com/certification


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