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Edit File : lwpacket.h \| Size : 4.89 KB
/* * Copyright (C) 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 https://mozilla.org/MPL/2.0/. * * See the COPYRIGHT file distributed with this work for additional * information regarding copyright ownership. / #ifndef LWRES_LWPACKET_H #define LWRES_LWPACKET_H 1 #include <inttypes.h> #include <lwres/lang.h> #include <lwres/lwbuffer.h> #include <lwres/result.h> /% lwres_lwpacket_t / typedef struct lwres_lwpacket lwres_lwpacket_t; /% lwres_lwpacket structure / struct lwres_lwpacket { /! The overall packet length, including the * entire packet header. * This field is filled in by the * \link lwres_gabn.c lwres_gabn_()\endlink and \link lwres_gnba.c lwres_gnba_()\endlink calls. / uint32_t length; /! Specifies the header format. Currently, there is only one format, #LWRES_LWPACKETVERSION_0. * This field is filled in by the * \link lwres_gabn.c lwres_gabn_()\endlink and \link lwres_gnba.c lwres_gnba_()\endlink calls. / uint16_t version; /! Specifies library-defined flags for this packet, such as whether the packet is a request or a reply. 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. * This field is filled in by * the application wits the exception of the * #LWRES_LWPACKETFLAG_RESPONSE bit, which is set by the library * in the * \link lwres_gabn.c lwres_gabn_()\endlink and \link lwres_gnba.c lwres_gnba_()\endlink calls. / uint16_t pktflags; /! 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.) / uint32_t serial; /! Opcodes between 0x04000000 and 0xffffffff * are application defined. Opcodes between * 0x00000000 and 0x03ffffff are * reserved for library use. * This field is filled in by the * \link lwres_gabn.c lwres_gabn_()\endlink and \link lwres_gnba.c lwres_gnba_()\endlink calls. / uint32_t opcode; /! Only valid for results. 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.) * This field is filled in by the * \link lwres_gabn.c lwres_gabn_()\endlink and \link lwres_gnba.c lwres_gnba_()\endlink calls. / uint32_t result; /! 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. * This field is supplied by the application. / uint32_t recvlength; /! 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. / uint16_t authtype; /! 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. / uint16_t authlength; }; #define LWRES_LWPACKET_LENGTH (4 5 + 2 * 4) /%< Overall length. / #define LWRES_LWPACKETFLAG_RESPONSE 0x0001U /%< If set, pkt is a response. / #define LWRES_LWPACKETVERSION_0 0 /%< Header format. / /! \file lwres/lwpacket.h * * The remainder of the packet consists of two regions, one described by * "authlen" and one of "length - authlen - sizeof(lwres_lwpacket_t)". * * That is: * * \code * pkt header * authlen bytes of auth information * data bytes * \endcode * * Currently defined opcodes: * \li #LWRES_OPCODE_NOOP. Success is always returned, with the packet contents echoed. \li #LWRES_OPCODE_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. * \li #LWRES_OPCODE_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 */ Back

Edit File : lwpacket.h | Size : 4.89 KB

/*
 * Copyright (C) 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 https://mozilla.org/MPL/2.0/.
 *
 * See the COPYRIGHT file distributed with this work for additional
 * information regarding copyright ownership.
 */

#ifndef LWRES_LWPACKET_H
#define LWRES_LWPACKET_H 1

#include <inttypes.h>

#include <lwres/lang.h>
#include <lwres/lwbuffer.h>
#include <lwres/result.h>

/*% lwres_lwpacket_t */
typedef struct lwres_lwpacket lwres_lwpacket_t;

/*% lwres_lwpacket structure */
struct lwres_lwpacket {
	/*! The overall packet length, including the
	 *  entire packet header.
	 *  This field is filled in by the
	 *  \link lwres_gabn.c lwres_gabn_*()\endlink
	 *  and \link lwres_gnba.c lwres_gnba_*()\endlink calls.
	 */
	uint32_t		length;
	/*! Specifies the header format.  Currently,
	 *  there is only one format, #LWRES_LWPACKETVERSION_0.
	 *  This field is filled in by the
	 *  \link lwres_gabn.c lwres_gabn_*()\endlink
	 *  and \link lwres_gnba.c lwres_gnba_*()\endlink calls.
	 */
	uint16_t		version;
	/*! Specifies library-defined flags for this packet, such as
	 *  whether the packet is a request or a reply.  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.
	 *  This field is filled in by
	 *  the application wits the exception of the
	 *  #LWRES_LWPACKETFLAG_RESPONSE bit, which is set by the library
	 *  in the
	 *  \link lwres_gabn.c lwres_gabn_*()\endlink
	 *  and \link lwres_gnba.c lwres_gnba_*()\endlink calls.
	 */
	uint16_t		pktflags;
	/*! 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.)
	 */
	uint32_t		serial;
	/*! Opcodes between 0x04000000 and 0xffffffff
	 *  are application defined.  Opcodes between
	 *  0x00000000 and 0x03ffffff are
	 * reserved for library use.
	 *  This field is filled in by the
	 *  \link lwres_gabn.c lwres_gabn_*()\endlink
	 *  and \link lwres_gnba.c lwres_gnba_*()\endlink calls.
	 */
	uint32_t		opcode;
	/*! Only valid for results.
	 *  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.)
	 *  This field is filled in by the
	 *  \link lwres_gabn.c lwres_gabn_*()\endlink
	 *  and \link lwres_gnba.c lwres_gnba_*()\endlink calls.
	 */
	uint32_t		result;
	/*! 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.
	 *  This field is supplied by the application.
	 */
	uint32_t		recvlength;
	/*! 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.
	 */
	uint16_t		authtype;
	/*! 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.
	 */
	uint16_t		authlength;
};

#define LWRES_LWPACKET_LENGTH		(4 * 5 + 2 * 4) /*%< Overall length. */

#define LWRES_LWPACKETFLAG_RESPONSE	0x0001U	/*%< If set, pkt is a response. */

#define LWRES_LWPACKETVERSION_0		0	/*%< Header format. */

/*! \file lwres/lwpacket.h
 *
 *
 * The remainder of the packet consists of two regions, one described by
 * "authlen" and one of "length - authlen - sizeof(lwres_lwpacket_t)".
 *
 * That is:
 *
 * \code
 *	pkt header
 *	authlen bytes of auth information
 *	data bytes
 * \endcode
 *
 * Currently defined opcodes:
 *
 *\li	#LWRES_OPCODE_NOOP.  Success is always returned, with the packet contents echoed.
 *
 *\li	#LWRES_OPCODE_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.
 *
 *\li	#LWRES_OPCODE_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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