305 lines
8.2 KiB
HTML
305 lines
8.2 KiB
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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
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<html>
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<head>
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<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
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<meta name="Copyright" content="Copyright (c) 2006 by IBM Corporation">
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<title>res_nupdate()--Build and Send Dynamic Updates</title>
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<!-- Begin Header Records ========================================== -->
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<!-- All rights reserved. Licensed Materials Property of IBM -->
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<!-- US Government Users Restricted Rights -->
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<!-- Use, duplication or disclosure restricted by -->
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<!-- GSA ADP Schedule Contract with IBM Corp. -->
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<!-- Unix8 SCRIPT J converted by B2H R4.1 (346) (CMS) by V2KEA304 -->
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<!-- at RCHVMW2 on 17 Feb 1999 at 11:05:09 -->
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<!-- Edited by Kersten Feb 02 -->
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<!--End Header Records -->
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<link rel="stylesheet" type="text/css" href="../rzahg/ic.css">
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</head>
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<body>
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<a name="Top_Of_Page"></a>
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<!-- Java sync-link -->
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<script type="text/javascript" language="Javascript" src="../rzahg/synch.js">
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</script>
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<h2>res_nupdate()--Build and Send Dynamic Updates</h2>
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<div class="box" style="width: 60%;">
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<br>
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Syntax<br>
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<pre>
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#include <sys/types.h>
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#include <netinet/in.h>
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#include <arpa/nameser.h>
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#include <resolv.h>
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int res_nupdate(state* <em>res</em>,
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ns_updrec *<em>update_record</em>
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ns_tsig_key *key)
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</pre>
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<br>
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Service Program Name: QSOSRV2<br>
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<!-- iddvc RMBR -->
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<br>
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Default Public Authority: *USE<br>
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<!-- iddvc RMBR -->
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<br>
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Threadsafe: Yes<br>
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<!-- iddvc RMBR -->
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<br>
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</div>
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<p>The <em>res_nupdate()</em> function separates the linked list of update
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records into groups so that all records in a group will belong to a single zone
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on the nameserver. It creates a dynamic update packet for each zone and sends
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it to the nameservers for that zone.</p>
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<h3>Parameters</h3>
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<dl>
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<dt><strong>res</strong></dt>
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<dd>(Input) The pointer to the <strong>state</strong> structure.<br>
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<br>
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</dd>
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<dt><strong>update_record</strong></dt>
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<dd>(Input) The pointer to the linked list of update records.<br>
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<br>
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</dd>
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<dt><strong>key</strong></dt>
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<dd>(Input) The pointer to the key to use for authentication. If it is NULL, no
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authentication will be done.</dd>
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</dl>
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<p>The <strong>ns_updrec</strong> structure is defined in
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<strong><arpa/nameser.h></strong>.</p>
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<pre>
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struct ns_updrec {
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struct {
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struct ns_updrec *prev, *next;
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} r_link, r_glink;
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ns_sect r_section;
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char * r_dname;
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ns_class r_class;
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ns_type r_type;
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uint32 r_ttl;
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unsigned char * r_data;
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uint32 r_size;
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int32 r_opcode;
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/* The following fields are ignored by the resolver routines */
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struct databuf * r_dp;
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struct databuf * r_deldp;
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uint32 r_zone;
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};
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typedef struct ns_updrec ns_updrec;
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</pre>
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<dl>
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<dt><em>r_link</em> and <em>r_glink</em></dt>
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<dd>Doubly linked lists of <strong>ns_updrec</strong> records.
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<em>res_nupdate()</em> uses <em>r_link</em> as its list of records to process
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and ignores <em>r_glink</em>. <em>res_nmkupdate()</em> uses <em>r_glink</em> as
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its list of records to process and ignores <em>r_link</em>.<br>
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<br>
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</dd>
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<dt><em>r_section</em></dt>
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<dd>See the <em>ns_sect</em> enums in <strong><arpa/nameser.h></strong>
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for allowed values.<br>
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<br>
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</dd>
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<dt><em>r_dname</em>,<em>r_class</em>,<em>r_type</em>,
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<em>r_ttl</em>,<em>r_data</em>, and <em>r_size</em></dt>
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<dd>Identify the resource record to the DNS<br>
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<br>
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</dd>
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<dt><em>r_opcode</em></dt>
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<dd>Type of update operation. Valid operations are <em>ns_uop_delete</em> or
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<em>ns_uop_add</em><br>
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<br>
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</dd>
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<dt>These fields are ignored by the resolver: <em>r_dp</em>, <em>r_deldp</em>,
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<em>r_zone</em>.</dt>
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</dl>
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<br>
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<h3>Authorities</h3>
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<p>No authorization is required.</p>
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<br>
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<h3>Return Value</h3>
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<p><em>res_nupdate()</em> returns an integer. Possible values are:</p>
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<ul>
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<li>n (successful), where n is the number of zones updated.<br>
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<br>
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</li>
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<li>-1 (unsuccessful)</li>
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</ul>
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<br>
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<h3>Error Conditions</h3>
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<p>When the <em>res_nupdate()</em> function fails, <em>res_nupdate()</em> can
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set <em>errno</em> to one of the following:</p>
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<dl>
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<dt><em>[ECONVERT]</em></dt>
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<dd><p>Either the input packet could not be translated
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to ASCII or the answer received could not be translated to the coded character
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set identifier (CCSID) currently in effect for the job.</p></dd>
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<dt><em>[EFAULT]</em></dt>
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<dd><p>The system detected a pointer that was invalid
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while attempting to access an input pointer.</p></dd>
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<dt><em>[EINVAL]</em></dt>
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<dd><p>One of the following reasons:</p>
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<ul>
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<li>An invalid length or NULL pointer was passed to <em>res_nupdate()</em><br><br></li>
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<li>The <strong>res</strong> appears to be initialized but the reserved field
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is not set to zeros.</li>
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</ul>
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</dd> </dl>
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<p><strong>Notes:</strong></p>
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<ul>
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<li>No attempt is made to initialize the
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<strong>res</strong> structure if it was initialized previous to the
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<em>res_nupdate()</em> being issued.<br><br></li>
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<li><em>res_nupdate()</em> calls <em>res_findzonecut()</em>,
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<em>res_nmkupdate()</em> and <em>res_nsend()</em> or <em>res_nsendsigned()</em>
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so errnos from those routines may also be set.</li>
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</ul>
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<br>
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<h3>Usage Notes</h3>
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<ol>
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<li><em>res_nupdate()</em> calls <em>res_ninit()</em> if the
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<strong>res</strong> structure has not been initialized.<br>
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<br>
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</li>
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<li><em>res_nupdate()</em> calls <em>res_findzonecut()</em> to find the zone
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and name server to be updated for each input record and sorts the records by
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zone. Then it makes a zone record for each zone and prepends it to the update
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records. It calls <em>res_nmkupdate()</em> to make the update packet and then
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calls either <em>res_nsend()</em> or <em>res_nsendsigned()</em> to send the
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packet. Note that since <em>res_nupdate()</em> prepends a new zone record, the
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input records must only contain pre-requisite and update records, not zone
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records.<br>
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<br>
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</li>
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<li><em>res_nupdate()</em> assumes that the data passed to it is EBCDIC and is
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in the default coded character set identifier (CCSID) currently in effect for
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the job. It translates the data from the default CCSID currently in effect for
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the job to ASCII (CCSID 819) before the data is sent out to a name server. The
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response that it receives from the name server is returned in the default CCSID
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currently in effect for the job.<br>
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<br>
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</li>
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<li><em>res_nupdate()</em> will not use the local cache. It will always send
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the packet to the server.<br>
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<br>
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</li>
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<li>When using TSIG, it is important that the QUTCOFFSET system value is set
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correctly for the local time zone. The resolver system and name server
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timestamps must be within 5 minutes of each other (adjusted by the UTC offset)
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or the authentication will fail with <em>ns_r_badtime</em>.</li>
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</ol>
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<br>
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<h3>Related Information</h3>
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<ul>
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<li><a href="resnclose.htm">res_nclose()</a>--Close Socket and Reset res
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Structure<br>
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<br>
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</li>
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<li><a href="resfindzonecut.htm">res_findzonecut()</a>--Find the Enclosing Zone and
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Servers<br>
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<br>
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</li>
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<li><a href="reshostalias.htm">res_hostalias()</a>--Retrieve the host alias<br>
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<br>
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</li>
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<li><a href="resninit.htm">res_ninit()</a>--Initialize res Structure<br>
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<br>
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</li>
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<li><a href="resnmkquery.htm">res_nmkquery()</a>--Place Domain Query in
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Buffer<br>
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<br>
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</li>
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<li><a href="resnmkupdate.htm">res_nmkupdate()</a>--Construct an Update
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Packet<br>
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<br>
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</li>
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<li><a href="resnquery.htm">res_nquery()</a>--Send Domain Query<br>
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<br>
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</li>
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<li><a href="resnsearch.htm">res_nsearch()</a>--Search for Domain Name<br>
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<br>
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</li>
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<li><a href="resnsend.htm">res_nsend()</a>--Send Buffered Domain Query<br>
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<br>
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</li>
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<li><a href="resnsendsigned.htm">res_nsendsigned()</a>--Send Authenticated Domain
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Query<br>
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<br>
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</li>
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<li><a href="resxlt.htm">res_xlate()</a>--Translate DNS Packets</li>
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</ul>
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<br>
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<hr>
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API introduced: V5R1
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<hr>
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<center>
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<table cellpadding="2" cellspacing="2">
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<tr align="center">
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<td valign="middle" align="center"><a href="#Top_Of_Page">Top</a> | <a href=
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"unix.htm">UNIX-Type APIs</a> | <a href="aplist.htm">APIs by category</a> </td>
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</tr>
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</table>
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</center>
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</body>
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</html>
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