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/*
* Copyright (C) 2004 Internet Systems Consortium, Inc. ("ISC")
* Copyright (C) 1999-2001 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 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.
*/
/* $ISC: lwpacket.h,v 1.17.206.1 2004/03/06 08:15:35 marka Exp $ */
#ifndef LWRES_LWPACKET_H
#define LWRES_LWPACKET_H 1
#include <lwres/lang.h>
#include <lwres/lwbuffer.h>
#include <lwres/result.h>
typedef struct lwres_lwpacket lwres_lwpacket_t;
struct lwres_lwpacket {
lwres_uint32_t length;
lwres_uint16_t version;
lwres_uint16_t pktflags;
lwres_uint32_t serial;
lwres_uint32_t opcode;
lwres_uint32_t result;
lwres_uint32_t recvlength;
lwres_uint16_t authtype;
lwres_uint16_t authlength;
};
#define LWRES_LWPACKET_LENGTH (4 * 5 + 2 * 4)
#define LWRES_LWPACKETFLAG_RESPONSE 0x0001U /* if set, pkt is a response */
#define LWRES_LWPACKETVERSION_0 0
/*
* "length" is the overall packet length, including the entire packet header.
*
* "version" specifies the header format. Currently, there is only one
* format, LWRES_LWPACKETVERSION_0.
*
* "flags" specifies library-defined flags for this packet. None of these
* are definable by the caller, but library-defined values can be set by
* the caller. For example, one bit in this field indicates if the packet
* is a request or a response.
*
* "serial" is set by the requestor and is returned in all replies. If two
* 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. (The library does not do this by default on replies, but
* does so on requests.)
*
* "opcode" is application defined. Opcodes between 0x04000000 and 0xffffffff
* are application defined. Opcodes between 0x00000000 and 0x03ffffff are
* reserved for library use.
*
* "result" is application defined, and valid only on replies.
* Results between 0x04000000 and 0xffffffff are application defined.
* Results between 0x00000000 and 0x03ffffff are reserved for library use.
* (This is the same reserved range defined in <isc/resultclass.h>, so it
* would be trivial to map ISC_R_* result codes into packet result codes
* when appropriate.)
*
* "recvlength" is set to 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.
*
* "authtype" is the packet level auth type used.
* Authtypes between 0x1000 and 0xffff are application defined. Authtypes
* between 0x0000 and 0x0fff are reserved for library use. This is currently
* unused and MUST be set to zero.
*
* "authlen" is the length of the authentication data. See the specific
* authtypes for more information on what is contained in this field. This
* is currently unused, and MUST be set to zero.
*
* The remainder of the packet consists of two regions, one described by
* "authlen" and one of "length - authlen - sizeof(lwres_lwpacket_t)".
*
* That is:
*
* pkt header
* authlen bytes of auth information
* data bytes
*/
/*
* Currently defined opcodes:
*
* NOOP. Success is always returned, with the packet contents echoed.
*
* GETADDRSBYNAME. Return all known addresses for a given name.
* This may return NIS or /etc/hosts info as well as DNS
* information. Flags will be provided to indicate ip4/ip6
* addresses are desired.
*
* GETNAMEBYADDR. Return the hostname for the given address. Once
* again, it will return data from multiple sources.
*/
LWRES_LANG_BEGINDECLS
/* XXXMLG document */
lwres_result_t
lwres_lwpacket_renderheader(lwres_buffer_t *b, lwres_lwpacket_t *pkt);
lwres_result_t
lwres_lwpacket_parseheader(lwres_buffer_t *b, lwres_lwpacket_t *pkt);
LWRES_LANG_ENDDECLS
#endif /* LWRES_LWPACKET_H */
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