File content as of revision 0:8918a71cdbe9:

/**
 * @file nbns_common.h
 * @brief Functions common to NBNS client and NBNS responder
 *
 * @section License
 *
 * Copyright (C) 2010-2017 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 1.7.6
 **/

#ifndef _NBNS_COMMON_H
#define _NBNS_COMMON_H

//Dependencies
#include "core/net.h"
#include "dns/dns_common.h"

//Default TTL value for NBNS resource records
#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))


/**
 * @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;


//CodeWarrior or Win32 compiler?
#if defined(__CWCC__) || defined(_WIN32)
   #pragma pack(push, 1)
#endif


/**
 * @brief NBNS message header
 **/

typedef __start_packed struct
{
   uint16_t id;         //0-1
#ifdef _CPU_BIG_ENDIAN
   uint16_t qr : 1;     //2
   uint16_t opcode : 4;
   uint16_t aa : 1;
   uint16_t tc : 1;
   uint16_t rd : 1;
   uint16_t ra : 1;     //3
   uint16_t z : 2;
   uint16_t b : 1;
   uint16_t rcode : 4;
#else
   uint16_t rd : 1;     //2
   uint16_t tc : 1;
   uint16_t aa : 1;
   uint16_t opcode : 4;
   uint16_t qr : 1;
   uint16_t rcode : 4;  //3
   uint16_t b : 1;
   uint16_t z : 2;
   uint16_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
} __end_packed NbnsHeader;


/**
 * @brief NBNS address entry
 **/

typedef __start_packed struct
{
   uint16_t flags;
   Ipv4Addr addr;
} __end_packed NbnsAddrEntry;


//CodeWarrior or Win32 compiler?
#if 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, void *params);

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);

#endif