diff options
Diffstat (limited to '')
| -rw-r--r-- | lib/lwres/man/lwres_packet.html | 264 |
1 files changed, 264 insertions, 0 deletions
diff --git a/lib/lwres/man/lwres_packet.html b/lib/lwres/man/lwres_packet.html new file mode 100644 index 0000000..38281c3 --- /dev/null +++ b/lib/lwres/man/lwres_packet.html @@ -0,0 +1,264 @@ +<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> +<!-- + - Copyright (C) 2000, 2001, 2004, 2005, 2007, 2014-2016, 2018, 2019 Internet Systems Consortium, Inc. ("ISC") + - + - This Source Code Form is subject to the terms of the Mozilla Public + - License, v. 2.0. If a copy of the MPL was not distributed with this + - file, You can obtain one at http://mozilla.org/MPL/2.0/. +--> +<html lang="en"> +<head> +<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1"> +<title>lwres_packet</title> +<meta name="generator" content="DocBook XSL Stylesheets V1.78.1"> +</head> +<body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"><div class="refentry"> +<a name="id-1"></a><div class="titlepage"></div> + + + + + + + + <div class="refnamediv"> +<h2>Name</h2> +<p> + lwres_lwpacket_renderheader, + lwres_lwpacket_parseheader + — lightweight resolver packet handling functions + </p> +</div> + <div class="refsynopsisdiv"> +<h2>Synopsis</h2> + <div class="funcsynopsis"> +<pre class="funcsynopsisinfo">#include <lwres/lwpacket.h></pre> +<table border="0" class="funcprototype-table" summary="Function synopsis" style="cellspacing: 0; cellpadding: 0;"> +<tr> +<td><code class="funcdef"> +lwres_result_t +<b class="fsfunc">lwres_lwpacket_renderheader</b>(</code></td> +<td>lwres_buffer_t *<var class="pdparam">b</var>, </td> +</tr> +<tr> +<td> </td> +<td>lwres_lwpacket_t *<var class="pdparam">pkt</var><code>)</code>;</td> +</tr> +</table> +<div class="funcprototype-spacer"> </div> +<table border="0" class="funcprototype-table" summary="Function synopsis" style="cellspacing: 0; cellpadding: 0;"> +<tr> +<td><code class="funcdef"> +lwres_result_t +<b class="fsfunc">lwres_lwpacket_parseheader</b>(</code></td> +<td>lwres_buffer_t *<var class="pdparam">b</var>, </td> +</tr> +<tr> +<td> </td> +<td>lwres_lwpacket_t *<var class="pdparam">pkt</var><code>)</code>;</td> +</tr> +</table> +<div class="funcprototype-spacer"> </div> +</div> + </div> + <div class="refsection"> +<a name="id-1.7"></a><h2>DESCRIPTION</h2> + + <p> + These functions rely on a + <span class="type">struct lwres_lwpacket</span> + which is defined in + <code class="filename">lwres/lwpacket.h</code>. + </p> + + <pre class="programlisting"> +typedef struct lwres_lwpacket lwres_lwpacket_t; + </pre> +<p> + </p> + <pre class="programlisting"> +struct lwres_lwpacket { + uint32_t length; + uint16_t version; + uint16_t pktflags; + uint32_t serial; + uint32_t opcode; + uint32_t result; + uint32_t recvlength; + uint16_t authtype; + uint16_t authlength; +}; +</pre> +<p> + </p> + + <p> + The elements of this structure are: + </p> +<div class="variablelist"><dl class="variablelist"> +<dt><span class="term"><code class="constant">length</code></span></dt> +<dd> + <p> + the overall packet length, including the entire packet header. + This field is filled in by the lwres_gabn_*() and lwres_gnba_*() + calls. + </p> + </dd> +<dt><span class="term"><code class="constant">version</code></span></dt> +<dd> + <p> + the header format. There is currently only one format, + <span class="type">LWRES_LWPACKETVERSION_0</span>. + + This field is filled in by the lwres_gabn_*() and lwres_gnba_*() + calls. + </p> + </dd> +<dt><span class="term"><code class="constant">pktflags</code></span></dt> +<dd> + <p> + library-defined flags for this packet: for instance whether the + packet + is a request or a reply. Flag values can be set, but not defined + by + the caller. + This field is filled in by the application wit the exception of + the + LWRES_LWPACKETFLAG_RESPONSE bit, which is set by the library in + the + lwres_gabn_*() and lwres_gnba_*() calls. + </p> + </dd> +<dt><span class="term"><code class="constant">serial</code></span></dt> +<dd> + <p> + is set by the requestor and is returned in all replies. If two + or more + packets from the same source have the same serial number and are + from + the same source, they are assumed to be duplicates and the + latter ones + may be dropped. + This field must be set by the application. + </p> + </dd> +<dt><span class="term"><code class="constant">opcode</code></span></dt> +<dd> + <p> + indicates the operation. + Opcodes between 0x00000000 and 0x03ffffff are + reserved for use by the lightweight resolver library. Opcodes + between + 0x04000000 and 0xffffffff are application defined. + This field is filled in by the lwres_gabn_*() and lwres_gnba_*() + calls. + </p> + </dd> +<dt><span class="term"><code class="constant">result</code></span></dt> +<dd> + <p> + is only valid for replies. + Results between 0x04000000 and 0xffffffff are application + defined. + Results between 0x00000000 and 0x03ffffff are reserved for + library use. + This field is filled in by the lwres_gabn_*() and lwres_gnba_*() + calls. + </p> + </dd> +<dt><span class="term"><code class="constant">recvlength</code></span></dt> +<dd> + <p> + is the maximum buffer size that the receiver can handle on + requests + and the size of the buffer needed to satisfy a request when the + buffer + is too large for replies. + This field is supplied by the application. + </p> + </dd> +<dt><span class="term"><code class="constant">authtype</code></span></dt> +<dd> + <p> + defines the packet level authentication that is used. + Authorisation types between 0x1000 and 0xffff are application + defined + and types between 0x0000 and 0x0fff are reserved for library + use. + Currently these are not used and must be zero. + </p> + </dd> +<dt><span class="term"><code class="constant">authlen</code></span></dt> +<dd> + <p> + gives the length of the authentication data. + Since packet authentication is currently not used, this must be + zero. + </p> + </dd> +</dl></div> +<p> + </p> + <p> + The following opcodes are currently defined: + </p> +<div class="variablelist"><dl class="variablelist"> +<dt><span class="term"><code class="constant">NOOP</code></span></dt> +<dd> + <p> + Success is always returned and the packet contents are echoed. + The lwres_noop_*() functions should be used for this type. + </p> + </dd> +<dt><span class="term"><code class="constant">GETADDRSBYNAME</code></span></dt> +<dd> + <p> + returns all known addresses for a given name. + The lwres_gabn_*() functions should be used for this type. + </p> + </dd> +<dt><span class="term"><code class="constant">GETNAMEBYADDR</code></span></dt> +<dd> + <p> + return the hostname for the given address. + The lwres_gnba_*() functions should be used for this type. + </p> + </dd> +</dl></div> +<p> + </p> + + <p><code class="function">lwres_lwpacket_renderheader()</code> + transfers the contents of lightweight resolver packet structure + <span class="type">lwres_lwpacket_t</span> <em class="parameter"><code>*pkt</code></em> in + network byte order to the lightweight resolver buffer, + <em class="parameter"><code>*b</code></em>. + </p> + + <p><code class="function">lwres_lwpacket_parseheader()</code> + performs the converse operation. It transfers data in network + byte order from buffer <em class="parameter"><code>*b</code></em> to resolver + packet <em class="parameter"><code>*pkt</code></em>. The contents of the buffer + <em class="parameter"><code>b</code></em> should correspond to a + <span class="type">lwres_lwpacket_t</span>. + </p> + + </div> + + <div class="refsection"> +<a name="id-1.8"></a><h2>RETURN VALUES</h2> + + <p> + Successful calls to + <code class="function">lwres_lwpacket_renderheader()</code> and + <code class="function">lwres_lwpacket_parseheader()</code> return + <span class="errorcode">LWRES_R_SUCCESS</span>. If there is insufficient + space to copy data between the buffer <em class="parameter"><code>*b</code></em> and + lightweight resolver packet <em class="parameter"><code>*pkt</code></em> both + functions + return <span class="errorcode">LWRES_R_UNEXPECTEDEND</span>. + </p> + + </div> +</div></body> +</html> |