[Mimedefang] Globals

Rich West Rich.West at wesmo.com
Tue Jul 13 13:32:17 EDT 2004


Thanks to all of those that responded.

Based upon all of the ideas, I came up with the following code to do the 
trick.

-Rich


sub filter_begin () {
...
    %lists = &get_lists();
}  

#***********************************************************************
# %PROCEDURE: get_list
# %ARGUMENTS:
#  None
# %RETURNS:
#  Array of lists on the system
# %DESCRIPTION:
#  This function fills an array with the names of all of the mailing
#  lists on the system.
#***********************************************************************
my %lists = ();

sub get_lists
{
   return (%lists) if (%lists);
   open (LISTS, "/var/mailman/bin/list_lists -b|")
     or die "Could not execute '/var/mailman/bin/list_lists -b'.\n";
   while (<LISTS>)
   {
      chop;
      $lists{$_} = 1;
   }
   close(LISTS);
   return (%lists);
}
#***********************************************************************
# %PROCEDURE: is_list
# %ARGUMENTS:
#  listname -- the name of the mailing list
# %RETURNS:
#  boolean - positive if the recipient matches a list name.
# %DESCRIPTION:
#  This function matches the incoming mailing address with a list name.
#  We do not scan the contents of mailing lists as spam.
#***********************************************************************
sub is_list
{
   my($listname) = shift;
   ##
   ## The email address, as it comes in, is surrounded by
   ## brackets.  We have to massage it a little in order to do
   ## proper matching.  eg: '<test at testdomain.com>' needs to be 'test'.
   ##
   $listname = (split("\@", $listname))[0];
   $listname = (split("\<", $listname))[1];
   return ($lists{lc($listname)});
}

sub filter_end ($) {
    my($entity) = @_;
...
    if ($RelayAddr eq "127.0.0.1" or $RelayAddr eq "my.ip.address.com")
    {
       md_graphdefang_log('mail_out',,$RelayAddr);
    }
    else
    {
       # Do not scan any messages going to any of the mailing lists.
       foreach $recipient (@Recipients)
       {
          if (&is_list($recipient))
          {
             md_graphdefang_log('mail_in', , $RelayAddr);
             md_graphdefang_log('mailing_list', $hits, $RelayAddr);
             return;
          }
       }


Steffen Kaiser wrote:

> On Thu, 8 Jul 2004, Rich West wrote:
>
> Hmm, I'd populate a global variable when the slave starts or in 
> filter_initialize. I do so, anyway.
>
>> sub is_list
>> {
>>  $listname = (split("\@", $listname))[0];
>>  $listname = (split("\<", $listname))[1];
>
>                 ^^^^ Angle brackets are not mandatory.
>
>>   foreach $list (@lists)
>>  {
>>     chop($list);
>>     return 1 if ($list =~ /^$listname/i);
>
>                             ^^^^^ here you check only, if the 
> recipient begins with a name of a list.
>
>>  }
>>  return 0;
>> }
>
>
> BTW: How about preparing the name cache a bit more in order to avoid 
> the foreach loop each time you lookup a name, e.g.
>
> 1) use a hash:
> %mailists = ( 'list1' => 1
>     , 'list2' => 1, ... );
> Then you can do simply  return $mailists{lc($listname)}
>
> 2) or use a large string: $mailists = '@list1 at list2@list3 at ...@';
> then do: return index($mailists, '@' . lc($listname) . '@') >= 0;
> (Because '@' is never part of listname, it's save.)
>
> Bye,
>



More information about the MIMEDefang mailing list