<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"> <!--Converted with LaTeX2HTML 2008 (1.71) original version by: Nikos Drakos, CBLU, University of Leeds * revised and updated by: Marcus Hennecke, Ross Moore, Herb Swan * with significant contributions from: Jens Lippmann, Marek Rouchal, Martin Wilck and others --> <HTML> <HEAD> <TITLE>On-access Scanning</TITLE> <META NAME="description" CONTENT="On-access Scanning"> <META NAME="keywords" CONTENT="clamdoc"> <META NAME="resource-type" CONTENT="document"> <META NAME="distribution" CONTENT="global"> <META NAME="Generator" CONTENT="LaTeX2HTML v2008"> <META HTTP-EQUIV="Content-Style-Type" CONTENT="text/css"> <LINK REL="STYLESHEET" HREF="clamdoc.css"> <LINK REL="next" HREF="node32.html"> <LINK REL="previous" HREF="node30.html"> <LINK REL="up" HREF="node28.html"> <LINK REL="next" HREF="node32.html"> </HEAD> <BODY > <DIV CLASS="navigation"><!--Navigation Panel--> <A NAME="tex2html619" HREF="node32.html"> <IMG WIDTH="37" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="next" SRC="next.png"></A> <A NAME="tex2html615" HREF="node28.html"> <IMG WIDTH="26" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="up" SRC="up.png"></A> <A NAME="tex2html609" HREF="node30.html"> <IMG WIDTH="63" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="previous" SRC="prev.png"></A> <A NAME="tex2html617" HREF="node1.html"> <IMG WIDTH="65" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="contents" SRC="contents.png"></A> <BR> <B> Next:</B> <A NAME="tex2html620" HREF="node32.html">Clamdtop</A> <B> Up:</B> <A NAME="tex2html616" HREF="node28.html">Usage</A> <B> Previous:</B> <A NAME="tex2html610" HREF="node30.html">Clamdscan</A> <B> <A NAME="tex2html618" HREF="node1.html">Contents</A></B> <BR> <BR></DIV> <!--End of Navigation Panel--> <H2><A NAME="SECTION00063000000000000000"></A><A NAME="On-access"></A> <BR> On-access Scanning </H2> There is a special thread in <code>clamd</code> that performs on-access scanning under Linux and shares internal virus database with the daemon. <SPAN CLASS="textbf">You must follow some important rules when using it:</SPAN> <UL> <LI>Always stop the daemon cleanly - using the SHUTDOWN command or the <BR> SIGTERM signal. In other case you can lose access to protected files until the system is restarted. </LI> <LI>Never protect the directory your mail-scanner software uses for attachment unpacking. Access to all infected files will be automatically blocked and the scanner (including <code>clamd</code>!) will not be able to detect any viruses. In the result <SPAN CLASS="textbf">all infected mails may be delivered.</SPAN> </LI> </UL> For example, to protect the whole system add the following lines to <code>clamd.conf</code>: <PRE> ScanOnAccess yes OnAccessIncludePath / OnAccessExcludePath /proc OnAccessExcludePath /temporary/dir/of/your/mail/scanning/software </PRE> For more configuration options, type 'man clamd.conf' or reference the example clamd.conf. <P> <BR><HR> <ADDRESS> Cisco 2014-05-21 </ADDRESS> </BODY> </HTML>