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/usr/share/openvas/scap/oval_update.xsl is in openvas-manager-common 6.0.9-2.

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<?xml version="1.0" encoding="UTF-8"?>
<!--
OpenVAS
$Id$
Description: Generate SQL (SQLite compatible) queries to update
the OVAL database.

Authors:
Henri Doreau <henri.doreau@greenbone.net>
Timo Pollmeier <timo.pollmeier@greenbone.net>

Copyright:
Copyright (C) 2011 - 2012 Greenbone Networks GmbH

This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License
as published by the Free Software Foundation; either version 2
of the License, or (at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
-->
<xsl:stylesheet version="1.0" 
  xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
  xmlns:ns6="http://scap.nist.gov/schema/scap-core/0.1"
  xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
  xmlns:date="http://exslt.org/dates-and-times"
  xmlns:str="http://exslt.org/strings"
  xmlns:oval="http://oval.mitre.org/XMLSchema/oval-common-5"
  xmlns:oval_definitions="http://oval.mitre.org/XMLSchema/oval-definitions-5"
  xmlns:oval_variables="http://oval.mitre.org/XMLSchema/oval-variables-5"
  xsi:schemaLocation="http://oval.mitre.org/language/version5.10.1/ovaldefinition/complete/oval-common-schema.xsd http://oval.mitre.org/language/version5.10.1/ovaldefinition/complete/oval-definitions-schema.xsd"
  extension-element-prefixes="date str"
  >
  <xsl:param name="refdate" select="0" />

  <xsl:output method="text"/>

  <xsl:variable name="filetimestamp"
    select="normalize-space(oval_definitions:oval_definitions/oval_definitions:generator/oval:timestamp)"/>

  <xsl:template match="oval_definitions:definition">
    <xsl:variable name="definitiondate" select="normalize-space((oval_definitions:metadata/oval_definitions:oval_repository/oval_definitions:dates/oval_definitions:submitted/@date | oval_definitions:metadata/oval_definitions:oval_repository/oval_definitions:dates/oval_definitions:status_change/@date | oval_definitions:metadata/oval_definitions:oval_repository/oval_definitions:dates/oval_definitions:modified/@date)[last()])" />

    <xsl:choose>
    <xsl:when test="$definitiondate='' or floor (date:seconds ($definitiondate)) &gt; number($refdate)">
    INSERT OR REPLACE INTO ovaldefs (
      uuid,
      name,
      comment,
      creation_time,
      modification_time,
      version,
      deprecated,
      def_class,
      title,
      description,
      xml_file,
      status,
      max_cvss,
      cve_refs
    ) VALUES (
      "<xsl:value-of select="@id"/>_"||(SELECT id FROM ovalfiles WHERE xml_file = "<xsl:value-of select="$filename"/>"),
      "<xsl:value-of select="@id"/>",
      "",
      <xsl:choose>
      <xsl:when test="$definitiondate != ''"><xsl:apply-templates select="oval_definitions:metadata/oval_definitions:oval_repository/oval_definitions:dates"/>
      </xsl:when>
      <xsl:otherwise><xsl:value-of select="floor (date:seconds ($filetimestamp))"/>,
      <xsl:value-of select="floor (date:seconds ($filetimestamp))"/>,
      </xsl:otherwise>
      </xsl:choose>
      <xsl:value-of select="@version"/>,
      <xsl:call-template name="boolean_def_false">
        <xsl:with-param name="value" select="@deprecated"/>
      </xsl:call-template>,
      "<xsl:value-of select="@class"/>",
      "<xsl:value-of select="str:replace(oval_definitions:metadata/oval_definitions:title/text(), '&quot;', '&quot;&quot;')"/>",
      "<xsl:value-of select="str:replace(oval_definitions:metadata/oval_definitions:description/text(), '&quot;', '&quot;&quot;')"/>",
      "<xsl:copy-of select="$filename"/>",
      <xsl:choose>
        <xsl:when test="oval_definitions:metadata/oval_definitions:oval_repository/oval_definitions:status != ''">
          "<xsl:value-of  select="oval_definitions:metadata/oval_definitions:oval_repository/oval_definitions:status"/>"
        </xsl:when>
        <xsl:otherwise>
          <xsl:choose>
            <xsl:when test="translate(@deprecated, $smallcase, $uppercase) = 'TRUE'">
              <xsl:text>"DEPRECATED"</xsl:text>
            </xsl:when>
            <xsl:otherwise>
              <xsl:text>""</xsl:text>
            </xsl:otherwise>
          </xsl:choose>
        </xsl:otherwise>
      </xsl:choose>,
      0.0,
      <xsl:value-of select="count(oval_definitions:metadata/oval_definitions:reference[translate(@source, $uppercase, $smallcase) = 'cve'])"/>
    );
      <xsl:for-each select="oval_definitions:metadata/oval_definitions:reference[translate(@source, $uppercase, $smallcase) = 'cve']">
      INSERT OR IGNORE INTO affected_ovaldefs (cve, ovaldef)
        SELECT cves.id, ovaldefs.id
        FROM cves, ovaldefs
        WHERE cves.name='<xsl:value-of select="@ref_id"/>'
          AND ovaldefs.name = '<xsl:value-of select="../../@id"/>';
      </xsl:for-each>
    </xsl:when>
    <xsl:otherwise>
    /* Filtered <xsl:value-of select="@id"/> (<xsl:value-of select="$definitiondate"/>) */
    </xsl:otherwise>
    </xsl:choose>
  </xsl:template>

  <xsl:template match="oval_definitions:dates"><xsl:choose>
      <xsl:when test="oval_definitions:submitted/@date | oval_definitions:status_change/@date | oval_definitions:modified/@date != ''"><xsl:value-of select="floor (date:seconds ((oval_definitions:submitted/@date | oval_definitions:status_change/@date | oval_definitions:modified/@date) [1]))"/>,
      <xsl:value-of select="floor (date:seconds ((oval_definitions:submitted/@date | oval_definitions:status_change/@date | oval_definitions:modified/@date) [last()]))"/>,
      </xsl:when>
      <xsl:otherwise><xsl:copy-of select="floor (date:seconds ($timestamp))"/>,
      <xsl:copy-of select="floor (date:seconds ($timestamp))"/>,
      </xsl:otherwise>
  </xsl:choose>
  </xsl:template>

  <xsl:template match="oval_definitions:generator" />
  <xsl:template match="oval_definitions:tests" />
  <xsl:template match="oval_definitions:objects" />
  <xsl:template match="oval_definitions:states" />
  <xsl:template match="oval_definitions:variables" />

  <xsl:template match="oval_variables:variable" />
  <xsl:template match="oval_variables:generator" />

  <xsl:template match="/">
    BEGIN TRANSACTION;

    INSERT OR IGNORE INTO ovalfiles (xml_file)
      VALUES ("<xsl:value-of select="$filename"/>");

    <xsl:apply-templates />
    COMMIT;
  </xsl:template>

  <xsl:variable name="smallcase" select="'abcdefghijklmnopqrstuvwxyz'" />
  <xsl:variable name="uppercase" select="'ABCDEFGHIJKLMNOPQRSTUVWXYZ'" />

  <xsl:template name="boolean_def_false">
    <xsl:param name="value"/>
    <xsl:choose>
      <xsl:when test="translate($value, $smallcase, $uppercase) = 'TRUE'">
        <xsl:text>1</xsl:text>
      </xsl:when>
      <xsl:otherwise>
        <xsl:text>0</xsl:text>
      </xsl:otherwise>
    </xsl:choose>
  </xsl:template>
</xsl:stylesheet>