"Banned Content" question - possibly a Web Bug code problem

[Julian Field]

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In which case try editing SMDiskStore.pm and replace the sub Lock and
sub Unlock with this code:

# Open and lock the message
sub Lock {
  my $this = shift;

  #print STDERR "About to lock " . $this->{hpath} . " and " .
  #             $this->{dpath} . "\n";
  MailScanner::Lock::openlock($this->{inhhandle}, '+<' . $this->{hpath},
'w', 'quiet')
    or return undef;
  #print STDERR "Got hlock\n";

  # If locking the dfile fails, then must close and unlock the qffile too
  # 14/12/2004 Try putting this back in for now.
  unless (MailScanner::Lock::openlock($this->{indhandle},
                     '+<' . $this->{dpath}, 'w', 'quiet')) {
        #JKF 14/12/2004 open($this->{indhandle}, '+<' . $this->{dpath})) {
    MailScanner::Lock::unlockclose($this->{inhhandle});
    return undef;
  }
  #print STDERR "Got dlock\n";
  return undef unless $this->{inhhandle} && $this->{indhandle};
  return 1;
}


# Close and unlock the message
sub Unlock {
  my $this = shift;

  # Now we lock the df file as well, we must unlock it too.
  MailScanner::Lock::unlockclose($this->{indhandle});
  #close($this->{indhandle});
  MailScanner::Lock::unlockclose($this->{inhhandle});
}



Quentin Campbell wrote:

>Julian
>
>The version of MailScanner on which I have seen the problem is 4.35.10.
>
>Quentin
>---
>PHONE: +44 191 222 8209    Information Systems and Services (ISS),
>                           University of Newcastle,
>                           Newcastle upon Tyne,
>FAX:   +44 191 222 8765    United Kingdom, NE1 7RU.
>------------------------------------------------------------------------
>"Any opinion expressed above is mine. The University can get its own."
>
>
>
>>-----Original Message-----
>>From: MailScanner mailing list
>>[mailto:MAILSCANNER at JISCMAIL.AC.UK] On Behalf Of Julian Field
>>Sent: 12 January 2005 15:30
>>To: MAILSCANNER at JISCMAIL.AC.UK
>>Subject: Re: "Banned Content" question - possibly a Web Bug
>>code problem
>>
>>What version of MailScanner are you using? I slightly improved the
>>locking code (took out an "improvement" I made a long time ago which I
>>only made after lots of people requested it) in 4.37. It now locks the
>>df as well as the qf, which slows down delivery slightly in some
>>situations, but appears to be more reliable than just locking the qf.
>>
>>Quentin Campbell wrote:
>>
>>
>>
>>>>-----Original Message-----
>>>>From: MailScanner mailing list
>>>>[mailto:MAILSCANNER at JISCMAIL.AC.UK] On Behalf Of Mike
>>>>Sent: 12 January 2005 11:53
>>>>To: MAILSCANNER at JISCMAIL.AC.UK
>>>>Subject: Re: "Banned Content" question - a related problem
>>>>
>>>>
>>>>
>>>>
>>>>
>>>>>From: MailScanner mailing list
>>>>>
>>>>>
>>[mailto:MAILSCANNER at JISCMAIL.AC.UK] On
>>
>>
>>>>>Behalf Of Quentin Campbell
>>>>>
>>>>>All the systems are now up2date as far as RH AS 3 patches are
>>>>>
>>>>>
>>>>>
>>>>>
>>>>concerned.
>>>>
>>>>
>>>>
>>>>
>>>>>All the systems use the Sendmail that comes with these
>>>>>
>>>>>
>>>>>
>>>>>
>>>>system; the last
>>>>
>>>>
>>>>
>>>>
>>>>>time they were updated this was Sendmail 8.12.11. I use the default
>>>>>locking in MailScanner.
>>>>>
>>>>>
>>>>>
>>>>>
>>>>I also had this problem on sendmail 8.12.10. After changing
>>>>the locking to posix, the problem was gone. So, although the
>>>>docs state that the locking problem occurs only from 8.13 on,
>>>>it seems that also some 8.12 versions are affected. Please set
>>>>the locking mechanism to "posix" and see if it solves your problem.
>>>>
>>>>
>>>>
>>>>
>>>I will do this as a last resort. There are four reasons why I want to
>>>investigate other things first. In particular I want to capture a
>>>message before then after it has gone through MailSanner and got
>>>corrupted:
>>>
>>>1. Locking works OK on RH AS 3 systems with an up-to-date kernel.
>>>2. The symptoms we are seeing do not appear to be repeatable so far
>>>which makes conclusive testing difficult.
>>>3. I have looked for other evidence of locking problems but
>>>
>>>
>>cannot find
>>
>>
>>>any. For example I can show that all messages tagged as spam by
>>>MailScanner have been tagged once only. If there is a locking problem
>>>you will see the same message (ie. same Sendmail QID) being tagged as
>>>spam more than once by two or more MS processes.
>>>4. The problem appears related to the Web Bug check. I will
>>>
>>>
>>switch that
>>
>>
>>>off first. See below for more details of this.
>>>
>>>Having looked further at the problem it appears to be related to MIME
>>>multipart/alternative messages having all or part of the HTML part
>>>corrupted. The text part is not being affected.
>>>
>>>In all of the cases the logs show that MailScanner has "disarmed" the
>>>HTML content. Since I only "disarm" Web Bugs it appears that there may
>>>be a bug in the Web Bugs code that causes an intermittent
>>>
>>>
>>problem. This
>>
>>
>>>suspicion is reinforced by the observation that the problem appears to
>>>have started when I enabled the Web Bug check late last year. I will
>>>first of all try "Allow WebBugs = yes" and see what happens.
>>>
>>>Quentin
>>>
>>>------------------------ MailScanner list ------------------------
>>>To unsubscribe, email jiscmail at jiscmail.ac.uk with the words:
>>>'leave mailscanner' in the body of the email.
>>>Before posting, read the MAQ (http://www.mailscanner.biz/maq/) and
>>>the archives (http://www.jiscmail.ac.uk/lists/mailscanner.html).
>>>
>>>Support MailScanner development - buy the book off the website!
>>>
>>>
>>>
>>>
>>>
>>--
>>Julian Field
>>www.MailScanner.info
>>Buy the MailScanner book at www.MailScanner.info/store
>>
>>PGP footprint: EE81 D763 3DB0 0BFD E1DC 7222 11F6 5947 1415 B654
>>
>>------------------------ MailScanner list ------------------------
>>To unsubscribe, email jiscmail at jiscmail.ac.uk with the words:
>>'leave mailscanner' in the body of the email.
>>Before posting, read the MAQ (http://www.mailscanner.biz/maq/) and
>>the archives (http://www.jiscmail.ac.uk/lists/mailscanner.html).
>>
>>Support MailScanner development - buy the book off the website!
>>
>>
>>
>>
>
>------------------------ MailScanner list ------------------------
>To unsubscribe, email jiscmail at jiscmail.ac.uk with the words:
>'leave mailscanner' in the body of the email.
>Before posting, read the MAQ (http://www.mailscanner.biz/maq/) and
>the archives (http://www.jiscmail.ac.uk/lists/mailscanner.html).
>
>Support MailScanner development - buy the book off the website!
>
>
>

--
Julian Field
www.MailScanner.info
Buy the MailScanner book at www.MailScanner.info/store

PGP footprint: EE81 D763 3DB0 0BFD E1DC 7222 11F6 5947 1415 B654

------------------------ MailScanner list ------------------------
To unsubscribe, email jiscmail at jiscmail.ac.uk with the words:
'leave mailscanner' in the body of the email.
Before posting, read the MAQ (http://www.mailscanner.biz/maq/) and
the archives (http://www.jiscmail.ac.uk/lists/mailscanner.html).

Support MailScanner development - buy the book off the website!