107 lines
6.4 KiB
HTML
107 lines
6.4 KiB
HTML
<?xml version="1.0" encoding="UTF-8"?>
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<!DOCTYPE html
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PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
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<html lang="en-us" xml:lang="en-us">
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<meta name="DC.Type" content="concept" />
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<meta name="DC.Title" content="Signature change" />
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<meta name="abstract" content="A scan would occur when the object is accessed if the global signature is different from the object's signature." />
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<meta name="description" content="A scan would occur when the object is accessed if the global signature is different from the object's signature." />
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<meta name="DC.Relation" scheme="URI" content="rzaaxscanoption.htm" />
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<meta name="DC.Relation" scheme="URI" content="../apis/ifsopenexit.htm" />
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<meta name="DC.Relation" scheme="URI" content="../apis/ifscloseexit.htm" />
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<meta name="DC.Relation" scheme="URI" content="../apis/chgscansgn.htm" />
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<meta name="copyright" content="(C) Copyright IBM Corporation 1999, 2006" />
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<meta name="DC.Rights.Owner" content="(C) Copyright IBM Corporation 1999, 2006" />
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<meta name="DC.Format" content="XHTML" />
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<meta name="DC.Identifier" content="rzaaxssigchg" />
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<link rel="stylesheet" type="text/css" href="./ibmdita.css" />
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<title>Signature change</title>
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</head>
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<body id="rzaaxssigchg"><a name="rzaaxssigchg"><!-- --></a>
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<!-- Java sync-link --><script language="Javascript" src="../rzahg/synch.js" type="text/javascript"></script>
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<h1 class="topictitle1">Signature change</h1>
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<div><p>A scan would occur when the object is accessed if the global signature
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is different from the object's signature.</p>
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<p>The global or independent ASP group signatures represent the level of software
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associated with the scan-related exit programs.
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The object signature reflects the global or independent ASP signature when
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the object was last scanned. When an object is not in an independent ASP group,
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the object signature is compared to the global scan signature. If the object
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is in an independent ASP, the object signature is compared to the associated
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independent ASP group scan signature.</p>
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<div class="note"><span class="notetitle">Note:</span> In the following example, the phrases scan key and scan key signature
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are used. The scan key is a method to identify one set of scanning software.
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An example of this is for a specific company. The scan key signature allows
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the set of scanning software to indicate the level of support it provides.
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One example of this is a set of virus definitions.</div>
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<p>Here is an example of when an object is not in an independent ASP group
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and a scan occurs:</p>
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<ol><li>An exit program is registered to the QIBM_QP0L_SCAN_OPEN exit point. A
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scan key and a scan key signature were specified as follows: <p>Scan key: XXXXXX<br />
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Scan key signature: 0000000000</p>
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The global scan signature is 0000 and
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is not updated.</li>
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<li>An exit program is then registered to the QIBM_QP0L_SCAN_CLOSE exit point.
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A scan key and a scan key signature were specified as follows: <p>Scan key: XXXXXX<br />
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Scan key signature: 1111111111</p>
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The global scan signature is then updated
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to 0001.</li>
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<li>Next, a file is opened that currently has an object signature of 0000.
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The existence of the exit programs, coupled with the difference in global
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scan signatures (0000 to 0001), initiates a scan. When the scan
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completes successfully, the file signature is updated to 0001.</li>
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<li>If the file is opened by another user, it will not be re-scanned since
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the object and global signatures match.</li>
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</ol>
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<p>The example below displays that the exit program wants to cause a re-scan
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to occur:</p>
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<ol><li>Support has been added to the system to scan for new types of viruses.
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The <span class="apiname">Change Scan Signature (QP0LCHSG)</span> API is called to update
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the scan keys' scan key signature. A scan key and a scan key signature are
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specified as follows: <p>Scan key: XXXXXX<br />
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Scan key signature: 2222222222</p>
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The global scan key signature is then
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updated to 0002.</li>
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<li>If the previously scanned file is now opened, the difference in signatures
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will cause a re-scan.</li>
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</ol>
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<p>The example continues on to show when an object is in an independent ASP
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group:</p>
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<ol><li>An independent ASP is varied on for the first time and a file in the independent
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ASP is opened. When the first file is opened, the independent ASP scan key
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list is compared to the system scan key list. The two are different because
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of the fact that there is no independent ASP scan key list. In this case,
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the independent ASP scan key list obtains the global scan key list. The independent
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ASP scan key list would then have a scan key of XXXXXX and a scan key signature
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of 2222222222. As a result, the independent ASP scan signature is changed
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to 0001. When the file in the independent ASP is opened that currently has
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an object signature of 0000, it is then compared to the independent ASP scan
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signature of 0001, and because of the difference the file is scanned. When
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scanned successfully, the file signature is updated to 0001.</li>
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</ol>
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<div class="note"><span class="notetitle">Note:</span> A signature change will trigger a scan unless the object has the 'object
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change only' attribute and the *USEOCOATR system value specified.</div>
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</div>
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<div>
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<div class="familylinks">
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<div class="parentlink"><strong>Parent topic:</strong> <a href="rzaaxscanoption.htm" title="Scanning can occur for a variety of reasons. Here is some information about when and why a scan might occur.">Scanning occurrences</a></div>
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</div>
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<div class="relinfo"><strong>Related information</strong><br />
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<div><a href="../apis/ifsopenexit.htm">QIBM_QP0L_SCAN_OPEN</a></div>
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<div><a href="../apis/ifscloseexit.htm">QIBM_QP0L_SCAN_CLOSE</a></div>
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<div><a href="../apis/chgscansgn.htm">Change Scan Signature (QP0LCHSG) API</a></div>
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</div>
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</div>
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</body>
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</html> |