280 lines
7.1 KiB
HTML
280 lines
7.1 KiB
HTML
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
|
|
<html>
|
|
<head>
|
|
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
|
|
<meta name="Copyright" content="Copyright (c) 2006 by IBM Corporation">
|
|
<title>res_xlate()--Translate DNS Packets</title>
|
|
<!-- Begin Header Records ========================================== -->
|
|
<!-- All rights reserved. Licensed Materials Property of IBM -->
|
|
<!-- US Government Users Restricted Rights -->
|
|
<!-- Use, duplication or disclosure restricted by -->
|
|
<!-- GSA ADP Schedule Contract with IBM Corp. -->
|
|
<!-- Unix8 SCRIPT J converted by B2H R4.1 (346) (CMS) by V2KEA304 -->
|
|
<!-- at RCHVMW2 on 17 Feb 1999 at 11:05:09 -->
|
|
<!-- Edited by Kersten Feb 02 -->
|
|
<!--End Header Records -->
|
|
<link rel="stylesheet" type="text/css" href="../rzahg/ic.css">
|
|
</head>
|
|
<body>
|
|
<a name="Top_Of_Page"></a>
|
|
<!-- Java sync-link -->
|
|
<script type="text/javascript" language="Javascript" src="../rzahg/synch.js">
|
|
</script>
|
|
|
|
<h2>res_xlate()--Translate DNS Packets</h2>
|
|
|
|
<div class="box" style="width: 60%;">
|
|
<br>
|
|
Syntax<br>
|
|
<pre>
|
|
#include <sys/types.h>
|
|
#include <netinet/in.h>
|
|
#include <arpa/nameser.h>
|
|
#include <resolv.h>
|
|
|
|
int res_xlate(int <em>input_ccsid</em>,
|
|
char *<em>input_packet</em>,
|
|
int <em>input_length</em>,
|
|
int <em>output_ccsid</em>,
|
|
char *<em>output_packet</em>,
|
|
int <em>output_length</em>)
|
|
</pre>
|
|
|
|
<br>
|
|
Service Program Name: QSOSRV2<br>
|
|
<!-- iddvc RMBR -->
|
|
<br>
|
|
Default Public Authority: *USE<br>
|
|
<!-- iddvc RMBR -->
|
|
<br>
|
|
Threadsafe: Yes<br>
|
|
<!-- iddvc RMBR -->
|
|
<br>
|
|
</div>
|
|
|
|
<p>The <em>res_xlate()</em> function is used to translate a standard DNS packet
|
|
between ASCII and EBCDIC.</p>
|
|
|
|
<br>
|
|
<h3>Parameters</h3>
|
|
|
|
<dl>
|
|
<dt><strong>input_ccsid</strong></dt>
|
|
|
|
<dd>(Input) The CCSID value of the input packet to be translated.<br>
|
|
<br>
|
|
</dd>
|
|
|
|
<dt><strong>input_packet</strong></dt>
|
|
|
|
<dd>(Input) The pointer to where the standard DNS packet to be translated
|
|
resides.<br>
|
|
<br>
|
|
</dd>
|
|
|
|
<dt><strong>input_length</strong></dt>
|
|
|
|
<dd>(Input) The length of <em>input_packet</em>.<br>
|
|
<br>
|
|
</dd>
|
|
|
|
<dt><strong>output_ccsid</strong></dt>
|
|
|
|
<dd>(Input) The CCSID value for the output packet.<br>
|
|
<br>
|
|
</dd>
|
|
|
|
<dt><strong>output_packet</strong></dt>
|
|
|
|
<dd>(Output) The pointer to where the translated DNS packet will be stored.<br>
|
|
<br>
|
|
</dd>
|
|
|
|
<dt><strong>output_length</strong></dt>
|
|
|
|
<dd>(Input) The length of <em>output_packet</em>.</dd>
|
|
</dl>
|
|
|
|
<br>
|
|
<h3>Authorities</h3>
|
|
|
|
<p>No authorization is required.</p>
|
|
|
|
<br>
|
|
<h3>Return Value</h3>
|
|
|
|
<p><em>res_xlate()</em> returns an integer. Possible values are:</p>
|
|
|
|
<ul>
|
|
<li>1 (successful)<br>
|
|
<br>
|
|
</li>
|
|
|
|
<li>0 (unsuccessful - translation error)<br>
|
|
<br>
|
|
</li>
|
|
|
|
<li>-1 (unsuccessful - errors other than translation)</li>
|
|
</ul>
|
|
|
|
<br>
|
|
|
|
|
|
<h3>Error Conditions</h3>
|
|
<p>When the <em>res_xlate()</em> function fails, it does not set specific
|
|
<em>errno</em> or <em>h_errno</em> values. An error occurs under the following
|
|
conditions:</p>
|
|
<ul>
|
|
<li>NULL pointer(s) passed to the function.<br><br></li>
|
|
<li>Invalid pointer(s) passed to the function.<br><br></li>
|
|
<li>Invalid lengths passed to the function.<br><br></li>
|
|
<li>An invalid packet format encountered.</li>
|
|
</ul>
|
|
|
|
<br>
|
|
<h3>Usage Notes</h3>
|
|
|
|
<ol>
|
|
<li><em>res_xlate()</em> parses through <em>input_packet</em>, determining
|
|
which fields need translation. The packet is copied into <em>output_packet</em>
|
|
as it is parsed, translating the fields as needed from <em>input_ccsid</em> to
|
|
<em>output_ccsid</em>. If a bad format is encountered or a user-supplied length
|
|
is too small, <em>res_xlate()</em> returns a -1.<br>
|
|
<br>
|
|
</li>
|
|
|
|
<li>If there is an error in the translation of
|
|
<strong><em>input_packet</em></strong> from
|
|
<strong><em>input_ccsid</em></strong> to
|
|
<strong><em>output_ccsid</em></strong>, <em>res_xlate()</em> returns a value of
|
|
0 to the caller.<br>
|
|
<br>
|
|
</li>
|
|
|
|
<li><em>res_xlate()</em> expects a value of 819 (ASCII) for either the input or
|
|
output coded character set identifier (CCSID). If translation from an EBCDIC
|
|
CCSID is to occur, the output CCSID needs to be set to 819.
|
|
<strong><em>input_packet</em></strong> is then translated to ASCII, and the
|
|
result is placed in <strong><em>output_packet</em></strong> If translation to
|
|
an EBCDIC CCSID is to occur, the input CCSID needs to be set to 819.
|
|
<strong><em>input_packet</em></strong> is then translated from ASCII to the
|
|
EBCDIC CCSID specified in <strong><em>output_ccsid</em></strong>, and the
|
|
result is placed in <strong><em>output_packet</em></strong>.
|
|
|
|
<p><em>res_xlate()</em> returns unsuccessfully with a value of -1 if CCSID 819
|
|
is not used for either <strong><em>input_ccsid</em></strong> or
|
|
<strong><em>output_ccsid</em></strong>. Also, if both
|
|
<strong><em>input_ccsid</em></strong> and
|
|
<strong><em>output_ccsid</em></strong> values are 819, <em>res_xlate()</em>
|
|
returns a -1.</p>
|
|
</li>
|
|
|
|
<li>In a thread-enabled environment, the <strong>_res</strong> is shared among
|
|
all threads within a process.</li>
|
|
</ol>
|
|
|
|
<br>
|
|
<h3>Related Information</h3>
|
|
|
|
<ul>
|
|
<li><a href="hstrerror.htm">hstrerror()</a>--Retrieve Resolver Error
|
|
Message<br>
|
|
<br>
|
|
</li>
|
|
|
|
<li><a href="reshostalias.htm">res_hostalias()</a>--Retrieve the host alias<br>
|
|
<br>
|
|
</li>
|
|
|
|
<li><a href="resini.htm">res_init()</a>--Initialize _res Structure<br>
|
|
<br>
|
|
</li>
|
|
|
|
<li><a href="resmkq.htm">res_mkquery()</a>--Place Domain Query in Buffer<br>
|
|
<br>
|
|
</li>
|
|
|
|
<li><a href="resqry.htm">res_query()</a>--Send Domain Query<br>
|
|
<br>
|
|
</li>
|
|
|
|
<li><a href="ressch.htm">res_search()</a>--Search for Domain Name<br>
|
|
<br>
|
|
</li>
|
|
|
|
<li><a href="ressnd.htm">res_send()</a>--Send Buffered Domain Query<br>
|
|
<br>
|
|
</li>
|
|
|
|
<li><a href="resclo.htm">res_close()</a>--Close Socket and Reset _res
|
|
Structure<br>
|
|
<br>
|
|
</li>
|
|
|
|
<li><a href="resfindzonecut.htm">res_findzonecut()</a>--Find the Enclosing Zone and
|
|
Servers<br>
|
|
<br>
|
|
</li>
|
|
|
|
<li><a href="reshostalias.htm">res_hostalias()</a>--Retrieve the host alias<br>
|
|
<br>
|
|
</li>
|
|
|
|
<li><a href="resninit.htm">res_ninit()</a>--Initialize res Structure<br>
|
|
<br>
|
|
</li>
|
|
|
|
<li><a href="resnclose.htm">res_nclose()</a>--Close Socket and Reset res
|
|
Structure<br>
|
|
<br>
|
|
</li>
|
|
|
|
<li><a href="resnmkquery.htm">res_nmkquery()</a>--Place Domain Query in
|
|
Buffer<br>
|
|
<br>
|
|
</li>
|
|
|
|
<li><a href="resnmkupdate.htm">res_nmkupdate()</a>--Construct an Update
|
|
Packet<br>
|
|
<br>
|
|
</li>
|
|
|
|
<li><a href="resnquery.htm">res_nquery()</a>--Send Domain Query<br>
|
|
<br>
|
|
</li>
|
|
|
|
<li><a href="resnsearch.htm">res_nsearch()</a>--Search for Domain Name<br>
|
|
<br>
|
|
</li>
|
|
|
|
<li><a href="resnsend.htm">res_nsend()</a>--Send Buffered Domain Query<br>
|
|
<br>
|
|
</li>
|
|
|
|
<li><a href="resnsendsigned.htm">res_nsendsigned()</a>--Send Authenticated Domain
|
|
Query<br>
|
|
<br>
|
|
</li>
|
|
|
|
<li><a href="resnupdate.htm">res_nupdate()</a>--Build and Send Dynamic
|
|
Updates<br>
|
|
<br>
|
|
</li>
|
|
</ul>
|
|
|
|
<hr>
|
|
API introduced: V3R1
|
|
|
|
<hr>
|
|
<center>
|
|
<table cellpadding="2" cellspacing="2">
|
|
<tr align="center">
|
|
<td valign="middle" align="center"><a href="#Top_Of_Page">Top</a> | <a href=
|
|
"unix.htm">UNIX-Type APIs</a> | <a href="aplist.htm">APIs by category</a> </td>
|
|
</tr>
|
|
</table>
|
|
</center>
|
|
</body>
|
|
</html>
|
|
|