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<!DOCTYPE book PUBLIC "-//OASIS//DTD DocBook XML V4.2//EN" "http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd" [<!ENTITY mdash "—">]> <!-- - Copyright (C) 2004, 2005, 2007, 2012 Internet Systems Consortium, Inc. ("ISC") - Copyright (C) 2000, 2001 Internet Software Consortium. - - Permission to use, copy, modify, and/or distribute this software for any - purpose with or without fee is hereby granted, provided that the above - copyright notice and this permission notice appear in all copies. - - THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH - REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY - AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT, - INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM - LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE - OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR - PERFORMANCE OF THIS SOFTWARE. --> <!-- $Id$ --> <refentry> <refentryinfo> <date>Jun 30, 2000</date> </refentryinfo> <refmeta> <refentrytitle>lwres_gnba</refentrytitle> <manvolnum>3</manvolnum> <refmiscinfo>BIND9</refmiscinfo> </refmeta> <docinfo> <copyright> <year>2004</year> <year>2005</year> <year>2007</year> <year>2012</year> <holder>Internet Systems Consortium, Inc. ("ISC")</holder> </copyright> <copyright> <year>2000</year> <year>2001</year> <holder>Internet Software Consortium.</holder> </copyright> </docinfo> <refnamediv> <refname>lwres_gnbarequest_render</refname> <refname>lwres_gnbaresponse_render</refname> <refname>lwres_gnbarequest_parse</refname> <refname>lwres_gnbaresponse_parse</refname> <refname>lwres_gnbaresponse_free</refname> <refname>lwres_gnbarequest_free</refname> <refpurpose>lightweight resolver getnamebyaddress message handling</refpurpose> </refnamediv> <refsynopsisdiv> <funcsynopsis> <funcsynopsisinfo> #include <lwres/lwres.h> </funcsynopsisinfo> <funcprototype> <funcdef> lwres_result_t <function>lwres_gnbarequest_render</function> </funcdef> <paramdef>lwres_context_t *<parameter>ctx</parameter></paramdef> <paramdef>lwres_gnbarequest_t *<parameter>req</parameter></paramdef> <paramdef>lwres_lwpacket_t *<parameter>pkt</parameter></paramdef> <paramdef>lwres_buffer_t *<parameter>b</parameter></paramdef> </funcprototype> <funcprototype> <funcdef> lwres_result_t <function>lwres_gnbaresponse_render</function> </funcdef> <paramdef>lwres_context_t *<parameter>ctx</parameter></paramdef> <paramdef>lwres_gnbaresponse_t *<parameter>req</parameter></paramdef> <paramdef>lwres_lwpacket_t *<parameter>pkt</parameter></paramdef> <paramdef>lwres_buffer_t *<parameter>b</parameter></paramdef> </funcprototype> <funcprototype> <funcdef> lwres_result_t <function>lwres_gnbarequest_parse</function></funcdef> <paramdef>lwres_context_t *<parameter>ctx</parameter></paramdef> <paramdef>lwres_buffer_t *<parameter>b</parameter></paramdef> <paramdef>lwres_lwpacket_t *<parameter>pkt</parameter></paramdef> <paramdef>lwres_gnbarequest_t **<parameter>structp</parameter></paramdef> </funcprototype> <funcprototype> <funcdef> lwres_result_t <function>lwres_gnbaresponse_parse</function></funcdef> <paramdef>lwres_context_t *<parameter>ctx</parameter></paramdef> <paramdef>lwres_buffer_t *<parameter>b</parameter></paramdef> <paramdef>lwres_lwpacket_t *<parameter>pkt</parameter></paramdef> <paramdef>lwres_gnbaresponse_t **<parameter>structp</parameter></paramdef> </funcprototype> <funcprototype> <funcdef> void <function>lwres_gnbaresponse_free</function> </funcdef> <paramdef>lwres_context_t *<parameter>ctx</parameter></paramdef> <paramdef>lwres_gnbaresponse_t **<parameter>structp</parameter></paramdef> </funcprototype> <funcprototype> <funcdef> void <function>lwres_gnbarequest_free</function></funcdef> <paramdef>lwres_context_t *<parameter>ctx</parameter></paramdef> <paramdef>lwres_gnbarequest_t **<parameter>structp</parameter></paramdef> </funcprototype> </funcsynopsis> </refsynopsisdiv> <refsect1> <title>DESCRIPTION</title> <para> These are low-level routines for creating and parsing lightweight resolver address-to-name lookup request and response messages. </para> <para> There are four main functions for the getnamebyaddr opcode. One render function converts a getnamebyaddr request structure — <type>lwres_gnbarequest_t</type> — 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 — <type>lwres_gnbaresponse_t</type> to the canonical format. This is complemented by a parse function which converts a packet in canonical format to a getnamebyaddr response structure. </para> <para> These structures are defined in <filename>lwres/lwres.h</filename>. They are shown below. </para> <para><programlisting> #define LWRES_OPCODE_GETNAMEBYADDR 0x00010002U </programlisting> </para> <para><programlisting> typedef struct { lwres_uint32_t flags; lwres_addr_t addr; } lwres_gnbarequest_t; </programlisting> </para> <para><programlisting> typedef struct { lwres_uint32_t flags; lwres_uint16_t naliases; char *realname; char **aliases; lwres_uint16_t realnamelen; lwres_uint16_t *aliaslen; void *base; size_t baselen; } lwres_gnbaresponse_t; </programlisting> </para> <para><function>lwres_gnbarequest_render()</function> uses resolver context <varname>ctx</varname> to convert getnamebyaddr request structure <varname>req</varname> to canonical format. The packet header structure <varname>pkt</varname> is initialised and transferred to buffer <varname>b</varname>. The contents of <varname>*req</varname> are then appended to the buffer in canonical format. <function>lwres_gnbaresponse_render()</function> performs the same task, except it converts a getnamebyaddr response structure <type>lwres_gnbaresponse_t</type> to the lightweight resolver's canonical format. </para> <para><function>lwres_gnbarequest_parse()</function> uses context <varname>ctx</varname> to convert the contents of packet <varname>pkt</varname> to a <type>lwres_gnbarequest_t</type> structure. Buffer <varname>b</varname> provides space to be used for storing this structure. When the function succeeds, the resulting <type>lwres_gnbarequest_t</type> is made available through <varname>*structp</varname>. <function>lwres_gnbaresponse_parse()</function> offers the same semantics as <function>lwres_gnbarequest_parse()</function> except it yields a <type>lwres_gnbaresponse_t</type> structure. </para> <para><function>lwres_gnbaresponse_free()</function> and <function>lwres_gnbarequest_free()</function> release the memory in resolver context <varname>ctx</varname> that was allocated to the <type>lwres_gnbaresponse_t</type> or <type>lwres_gnbarequest_t</type> structures referenced via <varname>structp</varname>. Any memory associated with ancillary buffers and strings for those structures is also discarded. </para> </refsect1> <refsect1> <title>RETURN VALUES</title> <para> The getnamebyaddr opcode functions <function>lwres_gnbarequest_render()</function>, <function>lwres_gnbaresponse_render()</function> <function>lwres_gnbarequest_parse()</function> and <function>lwres_gnbaresponse_parse()</function> all return <errorcode>LWRES_R_SUCCESS</errorcode> on success. They return <errorcode>LWRES_R_NOMEMORY</errorcode> if memory allocation fails. <errorcode>LWRES_R_UNEXPECTEDEND</errorcode> is returned if the available space in the buffer <varname>b</varname> is too small to accommodate the packet header or the <type>lwres_gnbarequest_t</type> and <type>lwres_gnbaresponse_t</type> structures. <function>lwres_gnbarequest_parse()</function> and <function>lwres_gnbaresponse_parse()</function> will return <errorcode>LWRES_R_UNEXPECTEDEND</errorcode> if the buffer is not empty after decoding the received packet. These functions will return <errorcode>LWRES_R_FAILURE</errorcode> if <structfield>pktflags</structfield> in the packet header structure <type>lwres_lwpacket_t</type> indicate that the packet is not a response to an earlier query. </para> </refsect1> <refsect1> <title>SEE ALSO</title> <para><citerefentry> <refentrytitle>lwres_packet</refentrytitle><manvolnum>3</manvolnum> </citerefentry>. </para> </refsect1> </refentry><!-- - Local variables: - mode: sgml - End: -->