[Freeswitch-dev] Registration Expiration Problem with NATHACK

Anthony Minessale anthony.minessale at gmail.com
Mon Apr 14 11:34:57 EDT 2008

fixed in rev 8101

On Mon, Apr 14, 2008 at 8:51 AM, Jonathan Palley <jpalley at gmail.com> wrote:

> Hi -
>   There is a small bug with registration expiration and nathack.
> There is an easy fix but the behavior is unexpected and I believe
> there is a chance it may point to a larger problem.
> So, I bring it up here.  The bug:
> sofia_reg.c has the function sofia_reg_check_expire which is called
> once a minute to clean out expired registrations from the database.
> On line 263:                    switch_snprintf(sql, sizeof(sql), "delete
> from
> sip_registrations where expires > 0 and expires <= %ld", (long) now);
> It deletes expired registrations.
> Later in the function we search for NATHACK user agents to send them
> an OPTIONS for the NAT keep alive.
> Line 282:               switch_snprintf(sql, sizeof(sql), "select * from
> sip_registrations where status like '%%NATHACK%%'");
> Here's the BUG: Line 282 selects records in the database that are
> supposed to be deleted in 263.  This means you send NAT keep alive to
> agents that have already expired.  The registrations are then cleared
> out of the db once this function completes.  Clearly there is some
> sort of lock around the db that prevents the delete from occurring
> when the sql function is actually called.
> Now, we can solve the immediate bug by changing the SQL statement in
> Line 282 to not select expired registrations...but is the sqlite
> supposed to lock like this?
> Thanks -
> JP
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Anthony Minessale II

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