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Re: How I did integrate Virus Scanner to ZMailer

Luke Galea( 2003-03-13 17:03 ):
LG> Why not use content filtering? I might have missed some of the
LG> previous conversation so forgive me if this has already been dealt
LG> with.

  1. I had a lot of problems with it on some machines.

  2. You can make easy DoS attack with content filtering which is
  executed during smtp connection. My server can scanning with virus
  only few messages per second. Think what happens if you have
  more connections per second sometimes.

LG> Luke Galea 
LG> Software Development
LG> BlueCat Networks
LG> 905-762-5225

LG> -----Original Message-----
LG> From: Tomasz Nowak [mailto:tnowak@triger.com.pl] 
LG> Sent: March 13, 2003 10:54 AM
LG> To: zmailer@nic.funet.fi
LG> Subject: How I did integrate Virus Scanner to ZMailer

LG> Hi,

LG>   Especcialy for Matti.

LG>   1. Change source directory for router daemon in router/router.c.
LG>   Replace "router" with for example "clean".

LG>   2. Make standalone process which scans directory router, get files,
LG>   scan with antyvirus, if ok then put them to directory clean. If
LG>   virus then generate warning message to sender and recipient and
LG>   delete virus message.

LG>   2.a. How scan ? I use a little modified amavis script. My amavis
LG>   gets message and extracts all attachments.

LG>   2.b. Run antyvirus with extracted attachments.

LG>   This is quite simple. I wrote for this simple perl script.

LG>   Some of antyviruses can extract attachments internaly. In this case
LG>   you can omit step 2.a.

LG>   If you have any question I help you with pleasure.

LG> Pozdrawiam.

Tomasz Nowak     TRIGER - Systemy Komputerowe   http://www.triger.com.pl
 Oferujemy m.in.  H@NDEL - Twój krok w nową erę sprzedaży w Internecie,
  usługi WebDesign, bezpieczne konta WWW, Email. Sprawdź nas już dziś.

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