2008-07-16 16:40:13 +00:00
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2010-03-10 19:14:19 +01:00
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original version by: Nikos Drakos, CBLU, University of Leeds
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* revised and updated by: Marcus Hennecke, Ross Moore, Herb Swan
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2014-05-21 11:15:21 -04:00
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<TITLE>Database checks</TITLE>
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2008-07-16 16:40:13 +00:00
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2009-02-25 19:49:26 +00:00
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<B> Next:</B> <A NAME="tex2html960"
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HREF="node57.html">Data scan functions</A>
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2014-05-21 11:15:21 -04:00
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<H3><A NAME="SECTION00073700000000000000">
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Database checks</A>
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</H3>
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It's very important to keep the internal instance of the database up to
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date. You can watch database changes with the <code>cl_stat..()</code> family
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of functions.
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<PRE>
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int cl_statinidir(const char *dirname, struct cl_stat *dbstat);
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int cl_statchkdir(const struct cl_stat *dbstat);
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int cl_statfree(struct cl_stat *dbstat);
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</PRE>
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Initialization:
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<PRE>
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...
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struct cl_stat dbstat;
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memset(&dbstat, 0, sizeof(struct cl_stat));
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cl_statinidir(dbdir, &dbstat);
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</PRE>
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To check for a change you just need to call <code>cl_statchkdir</code> and check
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its return value (0 - no change, 1 - some change occured). Remember to reset
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the <code>cl_stat</code> structure after reloading the database.
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<PRE>
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if(cl_statchkdir(&dbstat) == 1) {
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reload_database...;
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cl_statfree(&dbstat);
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cl_statinidir(cl_retdbdir(), &dbstat);
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}
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</PRE>
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Libclamav <SPAN CLASS="MATH"><IMG
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WIDTH="58" HEIGHT="35" ALIGN="MIDDLE" BORDER="0"
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SRC="img6.png"
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ALT="$\ge0.96$"></SPAN> includes and additional call to check the number of
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signatures that can be loaded from a given directory:
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<PRE>
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int cl_countsigs(const char *path, unsigned int countoptions,
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unsigned int *sigs);
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</PRE>
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The first argument points to the database directory, the second one
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specifies what signatures should be counted:
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<code>CL_COUNTSIGS_OFFICIAL</code> (official signatures),
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<BR> <code>CL_COUNTSIGS_UNOFFICIAL</code> (third party signatures),
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<code>CL_COUNTSIGS_ALL</code> (all signatures). The last argument points
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to the counter to which the number of detected signatures will
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be added (therefore the counter should be initially set to 0).
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The call returns <code>CL_SUCCESS</code> or an error code.
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<P>
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<BR><HR>
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<ADDRESS>
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Cisco 2014-05-21
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</ADDRESS>
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