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-.\"
-.\" Copyright (C) 2000, 2001  Internet Software Consortium.
-.\"
-.\" Permission to use, copy, modify, and 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 INTERNET SOFTWARE CONSORTIUM
-.\" DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL
-.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL
-.\" INTERNET SOFTWARE CONSORTIUM 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.
-.\"
-.TH "LWRES_NOOP" "3" "Jun 30, 2000" "BIND9" ""
-.SH NAME
-lwres_nooprequest_render, lwres_noopresponse_render, lwres_nooprequest_parse, lwres_noopresponse_parse, lwres_noopresponse_free, lwres_nooprequest_free \- lightweight resolver no-op message handling
-.SH SYNOPSIS
-\fB#include <lwres/lwres.h>
-.sp
-.na
-lwres_result_t
-lwres_nooprequest_render(lwres_context_t *ctx, lwres_nooprequest_t *req, lwres_lwpacket_t *pkt, lwres_buffer_t *b);
-.ad
-.sp
-.na
-lwres_result_t
-lwres_noopresponse_render(lwres_context_t *ctx, lwres_noopresponse_t *req, lwres_lwpacket_t *pkt, lwres_buffer_t *b);
-.ad
-.sp
-.na
-lwres_result_t
-lwres_nooprequest_parse(lwres_context_t *ctx, lwres_buffer_t *b, lwres_lwpacket_t *pkt, lwres_nooprequest_t **structp);
-.ad
-.sp
-.na
-lwres_result_t
-lwres_noopresponse_parse(lwres_context_t *ctx, lwres_buffer_t *b, lwres_lwpacket_t *pkt, lwres_noopresponse_t **structp);
-.ad
-.sp
-.na
-void
-lwres_noopresponse_free(lwres_context_t *ctx, lwres_noopresponse_t **structp);
-.ad
-.sp
-.na
-void
-lwres_nooprequest_free(lwres_context_t *ctx, lwres_nooprequest_t **structp);
-.ad
-\fR.SH "DESCRIPTION"
-.PP
-These are low-level routines for creating and parsing
-lightweight resolver no-op request and response messages.
-.PP
-The no-op message is analogous to a \fBping\fR packet: 
-a packet is sent to the resolver daemon and is simply echoed back.
-The opcode is intended to allow a client to determine if the server is
-operational or not.
-.PP
-There are four main functions for the no-op opcode.
-One render function converts a no-op request structure \(em
-\fBlwres_nooprequest_t\fR \(em
-to the lighweight resolver's canonical format.
-It is complemented by a parse function that converts a packet in this
-canonical format to a no-op request structure.
-Another render function converts the no-op response structure \(em
-\fBlwres_noopresponse_t\fR
-to the canonical format.
-This is complemented by a parse function which converts a packet in
-canonical format to a no-op response structure.
-.PP
-These structures are defined in
-\fIlwres/lwres.h\fR.
-They are shown below.
-.sp
-.nf
-#define LWRES_OPCODE_NOOP       0x00000000U
-
-typedef struct {
-        lwres_uint16_t  datalength;
-        unsigned char   *data;
-} lwres_nooprequest_t;
-
-typedef struct {
-        lwres_uint16_t  datalength;
-        unsigned char   *data;
-} lwres_noopresponse_t;
-.sp
-.fi
-Although the structures have different types, they are identical.
-This is because the no-op opcode simply echos whatever data was sent:
-the response is therefore identical to the request.
-.PP
-\fBlwres_nooprequest_render()\fR uses resolver
-context \fIctx\fR to convert no-op request structure
-\fIreq\fR to canonical format. The packet header
-structure \fIpkt\fR is initialised and transferred to
-buffer \fIb\fR. The contents of
-\fI*req\fR are then appended to the buffer in
-canonical format. \fBlwres_noopresponse_render()\fR
-performs the same task, except it converts a no-op response structure
-\fBlwres_noopresponse_t\fR to the lightweight resolver's
-canonical format.
-.PP
-\fBlwres_nooprequest_parse()\fR uses context
-\fIctx\fR to convert the contents of packet
-\fIpkt\fR to a \fBlwres_nooprequest_t\fR
-structure. Buffer \fIb\fR provides space to be used
-for storing this structure. When the function succeeds, the resulting
-\fBlwres_nooprequest_t\fR is made available through
-\fI*structp\fR.
-\fBlwres_noopresponse_parse()\fR offers the same
-semantics as \fBlwres_nooprequest_parse()\fR except it
-yields a \fBlwres_noopresponse_t\fR structure.
-.PP
-\fBlwres_noopresponse_free()\fR and
-\fBlwres_nooprequest_free()\fR release the memory in
-resolver context \fIctx\fR that was allocated to the
-\fBlwres_noopresponse_t\fR or \fBlwres_nooprequest_t\fR
-structures referenced via \fIstructp\fR.
-.SH "RETURN VALUES"
-.PP
-The no-op opcode functions
-\fBlwres_nooprequest_render()\fR,
-\fBlwres_noopresponse_render()\fR
-\fBlwres_nooprequest_parse()\fR
-and
-\fBlwres_noopresponse_parse()\fR
-all return
-LWRES_R_SUCCESS
-on success.
-They return
-LWRES_R_NOMEMORY
-if memory allocation fails.
-LWRES_R_UNEXPECTEDEND
-is returned if the available space in the buffer
-\fIb\fR
-is too small to accommodate the packet header or the
-\fBlwres_nooprequest_t\fR
-and
-\fBlwres_noopresponse_t\fR
-structures.
-\fBlwres_nooprequest_parse()\fR
-and
-\fBlwres_noopresponse_parse()\fR
-will return
-LWRES_R_UNEXPECTEDEND
-if the buffer is not empty after decoding the received packet.
-These functions will return
-LWRES_R_FAILURE
-if
-pktflags
-in the packet header structure
-\fBlwres_lwpacket_t\fR
-indicate that the packet is not a response to an earlier query.
-.SH "SEE ALSO"
-.PP
-\fBlwres_packet\fR(3)