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/contrib/bind9/lib/lwres/man/lwres_gnba.3

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  1.\" Copyright (C) 2004, 2005, 2007, 2012 Internet Systems Consortium, Inc. ("ISC")
  2.\" Copyright (C) 2000, 2001 Internet Software Consortium.
  3.\" 
  4.\" Permission to use, copy, modify, and/or distribute this software for any
  5.\" purpose with or without fee is hereby granted, provided that the above
  6.\" copyright notice and this permission notice appear in all copies.
  7.\" 
  8.\" THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH
  9.\" REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
 10.\" AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT,
 11.\" INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
 12.\" LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
 13.\" OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
 14.\" PERFORMANCE OF THIS SOFTWARE.
 15.\"
 16.\" $Id$
 17.\"
 18.hy 0
 19.ad l
 20.\"     Title: lwres_gnba
 21.\"    Author: 
 22.\" Generator: DocBook XSL Stylesheets v1.71.1 <http://docbook.sf.net/>
 23.\"      Date: Jun 30, 2000
 24.\"    Manual: BIND9
 25.\"    Source: BIND9
 26.\"
 27.TH "LWRES_GNBA" "3" "Jun 30, 2000" "BIND9" "BIND9"
 28.\" disable hyphenation
 29.nh
 30.\" disable justification (adjust text to left margin only)
 31.ad l
 32.SH "NAME"
 33lwres_gnbarequest_render, lwres_gnbaresponse_render, lwres_gnbarequest_parse, lwres_gnbaresponse_parse, lwres_gnbaresponse_free, lwres_gnbarequest_free \- lightweight resolver getnamebyaddress message handling
 34.SH "SYNOPSIS"
 35.nf
 36#include <lwres/lwres.h>
 37.fi
 38.HP 40
 39.BI "lwres_result_t lwres_gnbarequest_render(lwres_context_t\ *" "ctx" ", lwres_gnbarequest_t\ *" "req" ", lwres_lwpacket_t\ *" "pkt" ", lwres_buffer_t\ *" "b" ");"
 40.HP 41
 41.BI "lwres_result_t lwres_gnbaresponse_render(lwres_context_t\ *" "ctx" ", lwres_gnbaresponse_t\ *" "req" ", lwres_lwpacket_t\ *" "pkt" ", lwres_buffer_t\ *" "b" ");"
 42.HP 39
 43.BI "lwres_result_t lwres_gnbarequest_parse(lwres_context_t\ *" "ctx" ", lwres_buffer_t\ *" "b" ", lwres_lwpacket_t\ *" "pkt" ", lwres_gnbarequest_t\ **" "structp" ");"
 44.HP 40
 45.BI "lwres_result_t lwres_gnbaresponse_parse(lwres_context_t\ *" "ctx" ", lwres_buffer_t\ *" "b" ", lwres_lwpacket_t\ *" "pkt" ", lwres_gnbaresponse_t\ **" "structp" ");"
 46.HP 29
 47.BI "void lwres_gnbaresponse_free(lwres_context_t\ *" "ctx" ", lwres_gnbaresponse_t\ **" "structp" ");"
 48.HP 28
 49.BI "void lwres_gnbarequest_free(lwres_context_t\ *" "ctx" ", lwres_gnbarequest_t\ **" "structp" ");"
 50.SH "DESCRIPTION"
 51.PP
 52These are low\-level routines for creating and parsing lightweight resolver address\-to\-name lookup request and response messages.
 53.PP
 54There are four main functions for the getnamebyaddr opcode. One render function converts a getnamebyaddr request structure \(em
 55\fBlwres_gnbarequest_t\fR
 56\(em 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 \(em
 57\fBlwres_gnbaresponse_t\fR
 58to the canonical format. This is complemented by a parse function which converts a packet in canonical format to a getnamebyaddr response structure.
 59.PP
 60These structures are defined in
 61\fIlwres/lwres.h\fR. They are shown below.
 62.PP
 63.RS 4
 64.nf
 65#define LWRES_OPCODE_GETNAMEBYADDR      0x00010002U
 66.fi
 67.RE
 68.sp
 69.PP
 70.RS 4
 71.nf
 72typedef struct {
 73        lwres_uint32_t  flags;
 74        lwres_addr_t    addr;
 75} lwres_gnbarequest_t;
 76.fi
 77.RE
 78.sp
 79.PP
 80.RS 4
 81.nf
 82typedef struct {
 83        lwres_uint32_t  flags;
 84        lwres_uint16_t  naliases;
 85        char           *realname;
 86        char          **aliases;
 87        lwres_uint16_t  realnamelen;
 88        lwres_uint16_t *aliaslen;
 89        void           *base;
 90        size_t          baselen;
 91} lwres_gnbaresponse_t;
 92.fi
 93.RE
 94.sp
 95.PP
 96\fBlwres_gnbarequest_render()\fR
 97uses resolver context
 98\fIctx\fR
 99to convert getnamebyaddr request structure
100\fIreq\fR
101to canonical format. The packet header structure
102\fIpkt\fR
103is initialised and transferred to buffer
104\fIb\fR. The contents of
105\fI*req\fR
106are then appended to the buffer in canonical format.
107\fBlwres_gnbaresponse_render()\fR
108performs the same task, except it converts a getnamebyaddr response structure
109\fBlwres_gnbaresponse_t\fR
110to the lightweight resolver's canonical format.
111.PP
112\fBlwres_gnbarequest_parse()\fR
113uses context
114\fIctx\fR
115to convert the contents of packet
116\fIpkt\fR
117to a
118\fBlwres_gnbarequest_t\fR
119structure. Buffer
120\fIb\fR
121provides space to be used for storing this structure. When the function succeeds, the resulting
122\fBlwres_gnbarequest_t\fR
123is made available through
124\fI*structp\fR.
125\fBlwres_gnbaresponse_parse()\fR
126offers the same semantics as
127\fBlwres_gnbarequest_parse()\fR
128except it yields a
129\fBlwres_gnbaresponse_t\fR
130structure.
131.PP
132\fBlwres_gnbaresponse_free()\fR
133and
134\fBlwres_gnbarequest_free()\fR
135release the memory in resolver context
136\fIctx\fR
137that was allocated to the
138\fBlwres_gnbaresponse_t\fR
139or
140\fBlwres_gnbarequest_t\fR
141structures referenced via
142\fIstructp\fR. Any memory associated with ancillary buffers and strings for those structures is also discarded.
143.SH "RETURN VALUES"
144.PP
145The getnamebyaddr opcode functions
146\fBlwres_gnbarequest_render()\fR,
147\fBlwres_gnbaresponse_render()\fR
148\fBlwres_gnbarequest_parse()\fR
149and
150\fBlwres_gnbaresponse_parse()\fR
151all return
152\fBLWRES_R_SUCCESS\fR
153on success. They return
154\fBLWRES_R_NOMEMORY\fR
155if memory allocation fails.
156\fBLWRES_R_UNEXPECTEDEND\fR
157is returned if the available space in the buffer
158\fIb\fR
159is too small to accommodate the packet header or the
160\fBlwres_gnbarequest_t\fR
161and
162\fBlwres_gnbaresponse_t\fR
163structures.
164\fBlwres_gnbarequest_parse()\fR
165and
166\fBlwres_gnbaresponse_parse()\fR
167will return
168\fBLWRES_R_UNEXPECTEDEND\fR
169if the buffer is not empty after decoding the received packet. These functions will return
170\fBLWRES_R_FAILURE\fR
171if
172pktflags
173in the packet header structure
174\fBlwres_lwpacket_t\fR
175indicate that the packet is not a response to an earlier query.
176.SH "SEE ALSO"
177.PP
178\fBlwres_packet\fR(3).
179.SH "COPYRIGHT"
180Copyright \(co 2004, 2005, 2007, 2012 Internet Systems Consortium, Inc. ("ISC")
181.br
182Copyright \(co 2000, 2001 Internet Software Consortium.
183.br