diff options
Diffstat (limited to 'lib/lwres/man/lwres_gnba.html')
| -rw-r--r-- | lib/lwres/man/lwres_gnba.html | 304 |
1 files changed, 304 insertions, 0 deletions
diff --git a/lib/lwres/man/lwres_gnba.html b/lib/lwres/man/lwres_gnba.html new file mode 100644 index 0000000..b44e5ed --- /dev/null +++ b/lib/lwres/man/lwres_gnba.html @@ -0,0 +1,304 @@ +<!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_gnba</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_gnbarequest_render, + lwres_gnbaresponse_render, + lwres_gnbarequest_parse, + lwres_gnbaresponse_parse, + lwres_gnbaresponse_free, + lwres_gnbarequest_free + — lightweight resolver getnamebyaddress message handling + </p> +</div> + + <div class="refsynopsisdiv"> +<h2>Synopsis</h2> + + <div class="funcsynopsis"> +<pre class="funcsynopsisinfo"> +#include <lwres/lwres.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_gnbarequest_render</b> +(</code></td> +<td>lwres_context_t *<var class="pdparam">ctx</var>, </td> +</tr> +<tr> +<td> </td> +<td>lwres_gnbarequest_t *<var class="pdparam">req</var>, </td> +</tr> +<tr> +<td> </td> +<td>lwres_lwpacket_t *<var class="pdparam">pkt</var>, </td> +</tr> +<tr> +<td> </td> +<td>lwres_buffer_t *<var class="pdparam">b</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_gnbaresponse_render</b> +(</code></td> +<td>lwres_context_t *<var class="pdparam">ctx</var>, </td> +</tr> +<tr> +<td> </td> +<td>lwres_gnbaresponse_t *<var class="pdparam">req</var>, </td> +</tr> +<tr> +<td> </td> +<td>lwres_lwpacket_t *<var class="pdparam">pkt</var>, </td> +</tr> +<tr> +<td> </td> +<td>lwres_buffer_t *<var class="pdparam">b</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_gnbarequest_parse</b>(</code></td> +<td>lwres_context_t *<var class="pdparam">ctx</var>, </td> +</tr> +<tr> +<td> </td> +<td>lwres_buffer_t *<var class="pdparam">b</var>, </td> +</tr> +<tr> +<td> </td> +<td>lwres_lwpacket_t *<var class="pdparam">pkt</var>, </td> +</tr> +<tr> +<td> </td> +<td>lwres_gnbarequest_t **<var class="pdparam">structp</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_gnbaresponse_parse</b>(</code></td> +<td>lwres_context_t *<var class="pdparam">ctx</var>, </td> +</tr> +<tr> +<td> </td> +<td>lwres_buffer_t *<var class="pdparam">b</var>, </td> +</tr> +<tr> +<td> </td> +<td>lwres_lwpacket_t *<var class="pdparam">pkt</var>, </td> +</tr> +<tr> +<td> </td> +<td>lwres_gnbaresponse_t **<var class="pdparam">structp</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"> +void +<b class="fsfunc">lwres_gnbaresponse_free</b> +(</code></td> +<td>lwres_context_t *<var class="pdparam">ctx</var>, </td> +</tr> +<tr> +<td> </td> +<td>lwres_gnbaresponse_t **<var class="pdparam">structp</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"> +void +<b class="fsfunc">lwres_gnbarequest_free</b>(</code></td> +<td>lwres_context_t *<var class="pdparam">ctx</var>, </td> +</tr> +<tr> +<td> </td> +<td>lwres_gnbarequest_t **<var class="pdparam">structp</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 are low-level routines for creating and parsing + lightweight resolver address-to-name lookup request and + response messages. + </p> + <p> + There are four main functions for the getnamebyaddr opcode. + One render function converts a getnamebyaddr request structure — + <span class="type">lwres_gnbarequest_t</span> — + to the lightweight resolver's canonical format. + It is complemented by a parse function that converts a packet in this + canonical format to a getnamebyaddr request structure. + Another render function converts the getnamebyaddr response structure + — + <span class="type">lwres_gnbaresponse_t</span> + to the canonical format. + This is complemented by a parse function which converts a packet in + canonical format to a getnamebyaddr response structure. + </p> + <p> + These structures are defined in + <code class="filename">lwres/lwres.h</code>. + They are shown below. + </p> + <pre class="programlisting"> +#define LWRES_OPCODE_GETNAMEBYADDR 0x00010002U +</pre> +<p> + </p> + <pre class="programlisting"> +typedef struct { + uint32_t flags; + lwres_addr_t addr; +} lwres_gnbarequest_t; +</pre> +<p> + </p> + <pre class="programlisting"> +typedef struct { + uint32_t flags; + uint16_t naliases; + char *realname; + char **aliases; + uint16_t realnamelen; + uint16_t *aliaslen; + void *base; + size_t baselen; +} lwres_gnbaresponse_t; +</pre> +<p> + </p> + + <p><code class="function">lwres_gnbarequest_render()</code> + uses resolver context <code class="varname">ctx</code> to convert + getnamebyaddr request structure <code class="varname">req</code> to + canonical format. The packet header structure + <code class="varname">pkt</code> is initialised and transferred to buffer + <code class="varname">b</code>. The contents of <code class="varname">*req</code> + are then appended to the buffer in canonical format. + <code class="function">lwres_gnbaresponse_render()</code> performs the + same task, except it converts a getnamebyaddr response structure + <span class="type">lwres_gnbaresponse_t</span> to the lightweight resolver's + canonical format. + </p> + + <p><code class="function">lwres_gnbarequest_parse()</code> + uses context <code class="varname">ctx</code> to convert the contents of + packet <code class="varname">pkt</code> to a + <span class="type">lwres_gnbarequest_t</span> structure. Buffer + <code class="varname">b</code> provides space to be used for storing this + structure. When the function succeeds, the resulting + <span class="type">lwres_gnbarequest_t</span> is made available through + <code class="varname">*structp</code>. + <code class="function">lwres_gnbaresponse_parse()</code> offers the same + semantics as <code class="function">lwres_gnbarequest_parse()</code> + except it yields a <span class="type">lwres_gnbaresponse_t</span> structure. + </p> + + <p><code class="function">lwres_gnbaresponse_free()</code> + and <code class="function">lwres_gnbarequest_free()</code> release the + memory in resolver context <code class="varname">ctx</code> that was + allocated to the <span class="type">lwres_gnbaresponse_t</span> or + <span class="type">lwres_gnbarequest_t</span> structures referenced via + <code class="varname">structp</code>. Any memory associated with + ancillary buffers and strings for those structures is also + discarded. + </p> + </div> + + <div class="refsection"> +<a name="id-1.8"></a><h2>RETURN VALUES</h2> + + <p> + The getnamebyaddr opcode functions + <code class="function">lwres_gnbarequest_render()</code>, + <code class="function">lwres_gnbaresponse_render()</code> + <code class="function">lwres_gnbarequest_parse()</code> + and + <code class="function">lwres_gnbaresponse_parse()</code> + all return + <span class="errorcode">LWRES_R_SUCCESS</span> + on success. + They return + <span class="errorcode">LWRES_R_NOMEMORY</span> + if memory allocation fails. + <span class="errorcode">LWRES_R_UNEXPECTEDEND</span> + is returned if the available space in the buffer + <code class="varname">b</code> + is too small to accommodate the packet header or the + <span class="type">lwres_gnbarequest_t</span> + and + <span class="type">lwres_gnbaresponse_t</span> + structures. + <code class="function">lwres_gnbarequest_parse()</code> + and + <code class="function">lwres_gnbaresponse_parse()</code> + will return + <span class="errorcode">LWRES_R_UNEXPECTEDEND</span> + if the buffer is not empty after decoding the received packet. + These functions will return + <span class="errorcode">LWRES_R_FAILURE</span> + if + <code class="varname">pktflags</code> + in the packet header structure + <span class="type">lwres_lwpacket_t</span> + indicate that the packet is not a response to an earlier query. + </p> + </div> + <div class="refsection"> +<a name="id-1.9"></a><h2>SEE ALSO</h2> + + <p><span class="citerefentry"> + <span class="refentrytitle">lwres_packet</span>(3) + </span>. + </p> + </div> +</div></body> +</html> |