280 lines
7.1 KiB
HTML
280 lines
7.1 KiB
HTML
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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_xlate()--Translate DNS Packets</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_xlate()--Translate DNS Packets</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_xlate(int <em>input_ccsid</em>,
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char *<em>input_packet</em>,
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int <em>input_length</em>,
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int <em>output_ccsid</em>,
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char *<em>output_packet</em>,
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int <em>output_length</em>)
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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_xlate()</em> function is used to translate a standard DNS packet
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between ASCII and EBCDIC.</p>
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<br>
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<h3>Parameters</h3>
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<dl>
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<dt><strong>input_ccsid</strong></dt>
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<dd>(Input) The CCSID value of the input packet to be translated.<br>
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<br>
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</dd>
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<dt><strong>input_packet</strong></dt>
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<dd>(Input) The pointer to where the standard DNS packet to be translated
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resides.<br>
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<br>
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</dd>
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<dt><strong>input_length</strong></dt>
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<dd>(Input) The length of <em>input_packet</em>.<br>
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<br>
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</dd>
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<dt><strong>output_ccsid</strong></dt>
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<dd>(Input) The CCSID value for the output packet.<br>
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<br>
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</dd>
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<dt><strong>output_packet</strong></dt>
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<dd>(Output) The pointer to where the translated DNS packet will be stored.<br>
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<br>
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</dd>
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<dt><strong>output_length</strong></dt>
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<dd>(Input) The length of <em>output_packet</em>.</dd>
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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_xlate()</em> returns an integer. Possible values are:</p>
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<ul>
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<li>1 (successful)<br>
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<br>
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</li>
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<li>0 (unsuccessful - translation error)<br>
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<br>
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</li>
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<li>-1 (unsuccessful - errors other than translation)</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_xlate()</em> function fails, it does not set specific
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<em>errno</em> or <em>h_errno</em> values. An error occurs under the following
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conditions:</p>
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<ul>
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<li>NULL pointer(s) passed to the function.<br><br></li>
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<li>Invalid pointer(s) passed to the function.<br><br></li>
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<li>Invalid lengths passed to the function.<br><br></li>
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<li>An invalid packet format encountered.</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_xlate()</em> parses through <em>input_packet</em>, determining
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which fields need translation. The packet is copied into <em>output_packet</em>
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as it is parsed, translating the fields as needed from <em>input_ccsid</em> to
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<em>output_ccsid</em>. If a bad format is encountered or a user-supplied length
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is too small, <em>res_xlate()</em> returns a -1.<br>
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<br>
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</li>
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<li>If there is an error in the translation of
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<strong><em>input_packet</em></strong> from
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<strong><em>input_ccsid</em></strong> to
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<strong><em>output_ccsid</em></strong>, <em>res_xlate()</em> returns a value of
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0 to the caller.<br>
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<br>
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</li>
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<li><em>res_xlate()</em> expects a value of 819 (ASCII) for either the input or
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output coded character set identifier (CCSID). If translation from an EBCDIC
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CCSID is to occur, the output CCSID needs to be set to 819.
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<strong><em>input_packet</em></strong> is then translated to ASCII, and the
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result is placed in <strong><em>output_packet</em></strong> If translation to
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an EBCDIC CCSID is to occur, the input CCSID needs to be set to 819.
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<strong><em>input_packet</em></strong> is then translated from ASCII to the
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EBCDIC CCSID specified in <strong><em>output_ccsid</em></strong>, and the
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result is placed in <strong><em>output_packet</em></strong>.
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<p><em>res_xlate()</em> returns unsuccessfully with a value of -1 if CCSID 819
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is not used for either <strong><em>input_ccsid</em></strong> or
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<strong><em>output_ccsid</em></strong>. Also, if both
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<strong><em>input_ccsid</em></strong> and
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<strong><em>output_ccsid</em></strong> values are 819, <em>res_xlate()</em>
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returns a -1.</p>
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</li>
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<li>In a thread-enabled environment, the <strong>_res</strong> is shared among
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all threads within a process.</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="hstrerror.htm">hstrerror()</a>--Retrieve Resolver Error
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Message<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="resini.htm">res_init()</a>--Initialize _res Structure<br>
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<br>
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</li>
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<li><a href="resmkq.htm">res_mkquery()</a>--Place Domain Query in Buffer<br>
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<br>
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</li>
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<li><a href="resqry.htm">res_query()</a>--Send Domain Query<br>
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<br>
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</li>
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<li><a href="ressch.htm">res_search()</a>--Search for Domain Name<br>
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<br>
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</li>
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<li><a href="ressnd.htm">res_send()</a>--Send Buffered Domain Query<br>
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<br>
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</li>
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<li><a href="resclo.htm">res_close()</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="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="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="resnupdate.htm">res_nupdate()</a>--Build and Send Dynamic
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Updates<br>
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<br>
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</li>
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</ul>
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<hr>
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API introduced: V3R1
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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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