nbns_common.h

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/**
 * @file nbns_common.h
 * @brief Definitions common to NBNS client and NBNS responder
 *
 * @section License
 *
 * SPDX-License-Identifier: GPL-2.0-or-later
 *
 * Copyright (C) 2010-2025 Oryx Embedded SARL. All rights reserved.
 *
 * This file is part of CycloneTCP Open.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 *
 * @author Oryx Embedded SARL (www.oryx-embedded.com)
 * @version 2.5.0
 **/
 
#ifndef _NBNS_COMMON_H
#define _NBNS_COMMON_H
 
//Dependencies
#include "core/net.h"
#include "dns/dns_common.h"
 
//Default resource record TTL (cache lifetime)
#ifndef NBNS_DEFAULT_RESOURCE_RECORD_TTL
   #define NBNS_DEFAULT_RESOURCE_RECORD_TTL 120
#elif (NBNS_DEFAULT_RESOURCE_RECORD_TTL < 1)
   #error NBNS_DEFAULT_RESOURCE_RECORD_TTL parameter is not valid
#endif
 
//NBNS port number
#define NBNS_PORT 137
 
//Macro definition
#define NBNS_ENCODE_H(c) ('A' + (((c) >> 4) & 0x0F))
#define NBNS_ENCODE_L(c) ('A' + ((c) & 0x0F))
 
//C++ guard
#ifdef __cplusplus
extern "C" {
#endif
 
 
/**
 * @brief NBNS flags
 **/
 
typedef enum
{
   NBNS_ONT_BNODE = 0x0000,
   NBNS_ONT_PNODE = 0x2000,
   NBNS_ONT_MNODE = 0x4000,
   NBNS_G_UNIQUE  = 0x0000,
   NBNS_G_GROUP   = 0x8000
} DnsFlags;
 
 
//CC-RX, CodeWarrior or Win32 compiler?
#if defined(__CCRX__)
   #pragma pack
#elif defined(__CWCC__) || defined(_WIN32)
   #pragma pack(push, 1)
#endif
 
 
/**
 * @brief NBNS message header
 **/
 
typedef __packed_struct
{
   uint16_t id;         //0-1
#if defined(_CPU_BIG_ENDIAN) && !defined(__ICCRX__)
   uint8_t qr : 1;      //2
   uint8_t opcode : 4;
   uint8_t aa : 1;
   uint8_t tc : 1;
   uint8_t rd : 1;
   uint8_t ra : 1;      //3
   uint8_t z : 2;
   uint8_t b : 1;
   uint8_t rcode : 4;
#else
   uint8_t rd : 1;      //2
   uint8_t tc : 1;
   uint8_t aa : 1;
   uint8_t opcode : 4;
   uint8_t qr : 1;
   uint8_t rcode : 4;   //3
   uint8_t b : 1;
   uint8_t z : 2;
   uint8_t ra : 1;
#endif
   uint16_t qdcount;    //4-5
   uint16_t ancount;    //6-7
   uint16_t nscount;    //8-9
   uint16_t arcount;    //10-11
   uint8_t questions[]; //12
} NbnsHeader;
 
 
/**
 * @brief NBNS address entry
 **/
 
typedef __packed_struct
{
   uint16_t flags;
   Ipv4Addr addr;
} NbnsAddrEntry;
 
 
//CC-RX, CodeWarrior or Win32 compiler?
#if defined(__CCRX__)
   #pragma unpack
#elif defined(__CWCC__) || defined(_WIN32)
   #pragma pack(pop)
#endif
 
//NBNS related functions
error_t nbnsInit(NetInterface *interface);
 
void nbnsProcessMessage(NetInterface *interface,
   const IpPseudoHeader *pseudoHeader, const UdpHeader *udpHeader,
   const NetBuffer *buffer, size_t offset, const NetRxAncillary *ancillary,
   void *param);
 
size_t nbnsEncodeName(const char_t *src, uint8_t *dest);
 
size_t nbnsParseName(const NbnsHeader *message,
   size_t length, size_t pos, char_t *dest);
 
bool_t nbnsCompareName(const NbnsHeader *message,
   size_t length, size_t pos, const char_t *name);
 
//C++ guard
#ifdef __cplusplus
}
#endif
 
#endif