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/**************************************************************************/
/* */
/* Copyright (c) Microsoft Corporation. All rights reserved. */
/* */
/* This software is licensed under the Microsoft Software License */
/* Terms for Microsoft Azure RTOS. Full text of the license can be */
/* found in the LICENSE file at https://aka.ms/AzureRTOS_EULA */
/* and in the root directory of this software. */
/* */
/**************************************************************************/
/**************************************************************************/
/**************************************************************************/
/** */
/** NetX Component */
/** */
/** Domain Name System (DNS) */
/** */
/**************************************************************************/
/**************************************************************************/
/**************************************************************************/
/* */
/* APPLICATION INTERFACE DEFINITION RELEASE */
/* */
/* nxd_dns.h PORTABLE C */
/* 6.1.5 */
/* AUTHOR */
/* */
/* Yuxin Zhou, Microsoft Corporation */
/* */
/* DESCRIPTION */
/* */
/* This file defines the NetX Domain Name System Protocol (DNS) */
/* component, including all data types and external references. */
/* It is assumed that nx_api.h and nx_port.h have already been */
/* included. */
/* */
/* RELEASE HISTORY */
/* */
/* DATE NAME DESCRIPTION */
/* */
/* 05-19-2020 Yuxin Zhou Initial Version 6.0 */
/* 09-30-2020 Yuxin Zhou Modified comment(s), */
/* resulting in version 6.1 */
/* 12-31-2020 Yuxin Zhou Modified comment(s), prevented*/
/* infinite loop in name */
/* compression, resulting in */
/* version 6.1.3 */
/* 03-02-2021 Yuxin Zhou Modified comment(s), and */
/* improved the logic of */
/* receiving dns response, */
/* resulting in version 6.1.5 */
/* */
/**************************************************************************/
#ifndef NXD_DNS_H
#define NXD_DNS_H
/* Determine if a C++ compiler is being used. If so, ensure that standard
C is used to process the API information. */
#ifdef __cplusplus
/* Yes, C++ compiler is present. Use standard C. */
extern "C" {
#endif
#include "nx_udp.h"
#include "nx_ipv4.h"
#include "nx_ipv6.h"
/* Define the DNS ID. */
#define NX_DNS_ID 0x444e5320UL
/* Define message and name limits. */
#define NX_DNS_LABEL_MAX 63 /* Maximum Label (between to dots) size */
#define NX_DNS_NAME_MAX 255 /* Maximum Name size */
#define NX_DNS_IP_LOOKUP_SIZE 75 /* IPv6 needs 66 characters for the address plus 8 for the ip6.arpa plus null */
/* IPv4 needs 12 characters max for the address plus 12 for the IN-ADDR.ARPA plus null */
/* Define offsets into the DNS message buffer. */
#define NX_DNS_ID_OFFSET 0 /* Offset to ID code in DNS buffer */
#define NX_DNS_FLAGS_OFFSET 2 /* Offset to flags in DNS buffer */
#define NX_DNS_QDCOUNT_OFFSET 4 /* Offset to Question Count in DNS buffer */
#define NX_DNS_ANCOUNT_OFFSET 6 /* Offset to Answer Count in DNS buffer */
#define NX_DNS_NSCOUNT_OFFSET 8 /* Offset to Authority Count in DNS buffer */
#define NX_DNS_ARCOUNT_OFFSET 10 /* Offset to Additional Info. Count in DNS buffer */
#define NX_DNS_QDSECT_OFFSET 12 /* Offset to Question Section in DNS buffer */
/* Define return code constants. */
#define NX_DNS_SUCCESS 0x00 /* DNS success */
#define NX_DNS_ERROR 0xA0 /* DNS internal error */
#define NX_DNS_NO_SERVER 0xA1 /* No DNS server was specified */
#define NX_DNS_TIMEOUT 0xA2 /* DNS timeout occurred */
#define NX_DNS_QUERY_FAILED 0xA3 /* DNS query failed; no DNS server sent an 'answer' */
#define NX_DNS_BAD_ADDRESS_ERROR 0xA4 /* Improperly formatted IPv4 or IPv6 address */
#define NX_DNS_SIZE_ERROR 0xA5 /* DNS destination size is too small */
#define NX_DNS_MALFORMED_PACKET 0xA6 /* Improperly formed or corrupted DNS packet received */
#define NX_DNS_BAD_ID_ERROR 0xA7 /* DNS packet from server does not match query ID */
#define NX_DNS_PARAM_ERROR 0xA8 /* Invalid non pointer input to API */
#define NX_DNS_SERVER_NOT_FOUND 0xA9 /* Server not found in Client list of DNS servers */
#define NX_DNS_PACKET_CREATE_ERROR 0xAA /* Error creating DNS packet */
#define NX_DNS_EMPTY_DNS_SERVER_LIST 0xAB /* DNS Client's list of DNS servers is empty */
#define NX_DNS_SERVER_AUTH_ERROR 0xAC /* Server not able to authenticate answer/authority data*/
#define NX_DNS_ZERO_GATEWAY_IP_ADDRESS 0xAD /* DNS Client IP instance has a zero gateway IP address */
#define NX_DNS_MISMATCHED_RESPONSE 0xAE /* Server response type does not match the query request*/
#define NX_DNS_DUPLICATE_ENTRY 0xAF /* Duplicate entry exists in DNS server table */
#define NX_DNS_RETRY_A_QUERY 0xB0 /* SOA status returned; web site only exists as IPv4 */
#define NX_DNS_IPV6_DISABLED_ERROR 0xB1 /* Cannot process AAAA or PTR record with IPv6 disabled */
#define NX_DNS_INVALID_ADDRESS_TYPE 0xB2 /* IP address type (e.g. IPv6) not supported */
#define NX_DNS_IPV6_NOT_SUPPORTED 0xB3 /* Cannot process AAAA or PTR record with IPv6 disabled */
#define NX_DNS_NEED_MORE_RECORD_BUFFER 0xB4 /* The buffer size is not enough. */
#define NX_DNS_FEATURE_NOT_SUPPORTED 0xB5 /* The requested feature is not supported in this build */
#define NX_DNS_NAME_MISMATCH 0xB6 /* The name mismatch. */
#define NX_DNS_CACHE_ERROR 0xB7 /* The Cache size is not enough. */
/* Define constants for the flags word. */
#define NX_DNS_QUERY_MASK 0x8000
#define NX_DNS_RESPONSE_FLAG 0x8000
#define NX_DNS_ERROR_MASK 0x8002 /* Server response indicates an error or data not authenticated by server */
#define NX_DNS_OPCODE_QUERY (0 << 12) /* Shifted right 12 is still 0 */
#define NX_DNS_OPCODE_IQUERY (1 << 12) /* 1 shifted right by 12 */
#define NX_DNS_OPCODE_STATUS (2 << 12) /* 2 shifted right by 12 */
#define NX_DNS_AA_FLAG 0x0400 /* Authoritative Answer */
#define NX_DNS_TC_FLAG 0x0200 /* Truncated */
#define NX_DNS_RD_FLAG 0x0100 /* Recursive Query */
#define NX_DNS_RA_FLAG 0x0080 /* Recursion Available */
#define NX_DNS_FA_FLAG 0x0010 /* Force Authentication */
#define NX_DNS_RCODE_MASK 0x000f /* Isolate the Result Code */
#define NX_DNS_RCODE_SUCCESS 0
#define NX_DNS_RCODE_FORMAT_ERR 1
#define NX_DNS_RCODE_SERVER_ERR 2
#define NX_DNS_RCODE_NAME_ERR 3
#define NX_DNS_RCODE_NOT_IMPL 4
#define NX_DNS_RCODE_REFUSED 5
#define NX_DNS_QUERY_FLAGS (NX_DNS_OPCODE_QUERY | NX_DNS_RD_FLAG) /* | NX_DNS_FA_FLAG */
/* Define name compression masks. */
#define NX_DNS_COMPRESS_MASK 0xc0
#define NX_DNS_COMPRESS_VALUE 0xc0
#define NX_DNS_POINTER_MASK 0xc000
/* Define resource record types. */
#define NX_DNS_RR_TYPE_A 1 /* Host address */
#define NX_DNS_RR_TYPE_NS 2 /* Authoritative name server */
#define NX_DNS_RR_TYPE_MD 3 /* Mail destination (Obsolete - use MX) */
#define NX_DNS_RR_TYPE_MF 4 /* Mail forwarder (Obsolete - use MX) */
#define NX_DNS_RR_TYPE_CNAME 5 /* Canonical name for an alias */
#define NX_DNS_RR_TYPE_SOA 6 /* Marks the start of a zone of authority */
#define NX_DNS_RR_TYPE_MB 7 /* Mailbox domain name (EXPERIMENTAL) */
#define NX_DNS_RR_TYPE_MG 8 /* Mail group member (EXPERIMENTAL) */
#define NX_DNS_RR_TYPE_MR 9 /* Mail rename domain name (EXPERIMENTAL) */
#define NX_DNS_RR_TYPE_NULL 10 /* Null RR (EXPERIMENTAL) */
#define NX_DNS_RR_TYPE_WKS 11 /* Well known service description */
#define NX_DNS_RR_TYPE_PTR 12 /* Domain name pointer */
#define NX_DNS_RR_TYPE_HINFO 13 /* Host information */
#define NX_DNS_RR_TYPE_MINFO 14 /* Mailbox or mail list information */
#define NX_DNS_RR_TYPE_MX 15 /* Mail exchange */
#define NX_DNS_RR_TYPE_TXT 16 /* Text strings */
#define NX_DNS_RR_TYPE_AAAA 28 /* IPv6 Host address */
#define NX_DNS_RR_TYPE_SRV 33 /* The location of services */
/* Define constants for Qtypes (queries). */
#define NX_DNS_RR_TYPE_AXFR 252 /* Request for a transfer of an entire zone */
#define NX_DNS_RR_TYPE_MAILB 253 /* Request for mailbox-related records (MB, MG or MR) */
#define NX_DNS_RR_TYPE_MAILA 254 /* Request for mail agent RRs (Obsolete - see MX) */
#define NX_DNS_RR_TYPE_ALL 255 /* Request for all records */
/* Define resource record classes. */
#define NX_DNS_RR_CLASS_IN 1 /* Internet */
#define NX_DNS_RR_CLASS_CS 2 /* CSNET class (Obsolete) */
#define NX_DNS_RR_CLASS_CH 3 /* CHAOS class */
#define NX_DNS_RR_CLASS_HS 4 /* Hesiod [Dyer 87] */
/* Define constant valid for Qtypes (queries). */
#define NX_DNS_RR_CLASS_ALL 255 /* Any class */
/* Define the TCP and UDP port number */
#define NX_DNS_PORT 53 /* Port for TX,RX and TCP/UDP */
/* Start of configurable options. */
/* Set the IP instance gateway server to be the DNS server if the gateway address is non zero. */
/*
#define NX_DNS_IP_GATEWAY_AND_DNS_SERVER
*/
/* Determine if the Client will create its own packet pool
or let the host application create one. See nx_dns_packet_pool_set
for how to set the DNS packet pool from the host application. */
/*
#define NX_DNS_CLIENT_USER_CREATE_PACKET_POOL
*/
/* Enable the feature to clear off old DNS packets before sending a fresh query. */
/*
#define NX_DNS_CLIENT_CLEAR_QUEUE
*/
/* Enable the feature to send the TXT, CNAME, NS, MX, SRV, SOA DNS types query. */
/*
#define NX_DNS_ENABLE_EXTENDED_RR_TYPES
*/
/* Enable the cache to store the resource record. */
/*
#define NX_DNS_CACHE_ENABLE
*/
/* Define UDP socket create options. */
#ifndef NX_DNS_TYPE_OF_SERVICE
#define NX_DNS_TYPE_OF_SERVICE NX_IP_NORMAL
#endif
#ifndef NX_DNS_FRAGMENT_OPTION
#define NX_DNS_FRAGMENT_OPTION NX_DONT_FRAGMENT
#endif
#ifndef NX_DNS_TIME_TO_LIVE
#define NX_DNS_TIME_TO_LIVE 0x80
#endif
/* Define the queue depth of the DNS Client socket. */
#ifndef NX_DNS_QUEUE_DEPTH
#define NX_DNS_QUEUE_DEPTH 5
#endif
/* Define the maximum size of DNS message. 512 is the maximum size defined in RFC 1035 section 2.3.4. */
#ifndef NX_DNS_MESSAGE_MAX
#define NX_DNS_MESSAGE_MAX 512
#endif
/* Define a payload to include the maximum size DNS message plus the Ethernet, IP and UDP overhead. */
#ifndef NX_DNS_PACKET_PAYLOAD_UNALIGNED
#define NX_DNS_PACKET_PAYLOAD_UNALIGNED (NX_UDP_PACKET + NX_DNS_MESSAGE_MAX)
#endif
/* Round up to a 4 byte aligned packet payload. */
#define NX_DNS_PACKET_PAYLOAD (((NX_DNS_PACKET_PAYLOAD_UNALIGNED + sizeof(ULONG) - 1)/sizeof(ULONG)) * sizeof(ULONG))
/* Define the size (e.g. number of packets) of the DNS Client
packet pool for sending out DNS messages. */
#ifndef NX_DNS_PACKET_POOL_SIZE
#define NX_DNS_PACKET_POOL_SIZE (16 * (NX_DNS_PACKET_PAYLOAD + sizeof(NX_PACKET)))
#endif
/* Define the maximum number of retries to a DNS server. */
#ifndef NX_DNS_MAX_RETRIES
#define NX_DNS_MAX_RETRIES 3
#endif
/* Define size of the DNS server list. Remember to allow for one 'null' terminating
e.g. zero IP address entry for this list. */
#ifndef NX_DNS_MAX_SERVERS
#define NX_DNS_MAX_SERVERS 5
#endif
/* Define the maximum amount of time to retransmit a DNS query. The default wait time is 64 seconds.
the retransmission policy are recommended in RFC1035 page 32. */
#ifndef NX_DNS_MAX_RETRANS_TIMEOUT
#define NX_DNS_MAX_RETRANS_TIMEOUT (64 * NX_IP_PERIODIC_RATE)
#endif
/* Define the timeout option in timer ticks for allocating a packet
from the DNS Client packet pool. */
#ifndef NX_DNS_PACKET_ALLOCATE_TIMEOUT
#define NX_DNS_PACKET_ALLOCATE_TIMEOUT NX_IP_PERIODIC_RATE
#endif
/* Define the maximum number of pointers allowed in name compression. */
#ifndef NX_DNS_MAX_COMPRESSION_POINTERS
#define NX_DNS_MAX_COMPRESSION_POINTERS 16
#endif
/* Define the basic DNS data structure. */
typedef struct NX_IP_DNS_STRUCT
{
ULONG nx_dns_id; /* DNS ID */
UCHAR *nx_dns_domain; /* Pointer to domain name */
USHORT nx_dns_lookup_type; /* DNS look up type */
USHORT nx_dns_transmit_id; /* DNS message transmit identifier */
NX_IP *nx_dns_ip_ptr; /* Pointer to associated IP structure */
NXD_ADDRESS nx_dns_server_ip_array[NX_DNS_MAX_SERVERS]; /* List of DNS server IP addresses */
ULONG nx_dns_retries; /* DNS query retries */
#ifndef NX_DNS_CLIENT_USER_CREATE_PACKET_POOL
NX_PACKET_POOL nx_dns_pool; /* The pool of UDP data packets for DNS messages */
UCHAR nx_dns_pool_area[NX_DNS_PACKET_POOL_SIZE];
#endif
NX_PACKET_POOL *nx_dns_packet_pool_ptr; /* Pointer to DNS Client packet pool */
NX_UDP_SOCKET nx_dns_socket; /* DNS Socket */
TX_MUTEX nx_dns_mutex; /* DNS Mutex to protect DNS instance */
#ifdef NX_DNS_CACHE_ENABLE
UCHAR* nx_dns_cache; /* Pointer to the cache. */
UINT nx_dns_cache_size; /* The size of cache. */
ULONG nx_dns_rr_count; /* The number of resource records in the cache. */
ULONG nx_dns_string_count; /* The number of strings in the cache. */
ULONG nx_dns_string_bytes; /* The number of total bytes in string table in the cache. */
VOID (*nx_dns_cache_full_notify)(struct NX_IP_DNS_STRUCT *);
#endif /* NX_DNS_CACHE_ENABLE */
} NX_DNS;
/* Define the RDATA structure. */
/********************************************************************************/
/* Type A */
/********************************************************************************/
/* A RDATA format
1 2 3
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
|-------------------------------------------------------------|
| ADDRESS |
|-------------------------------------------------------------|
*/
/* The host name may have multiple addresses,so we need a buffer to record the all addresses.
return_buffer must be 4-byte aligned. This return buffer is used to store IP addresses returned from the server.
record_number stores the number of entries in the buffer. If the server returns more entries than the buffer
can hold, the entries exceeding the buffer size are dropped. */
/* Layout of the buffer
|-------------------------------------------------------------------------------------|
|ip.address.0|ip.address.1|ip.address.2|....... |ip.address.n|
|-------------------------------------------------------------------------------------|
*/
/********************************************************************************/
/* Type AAAA */
/********************************************************************************/
/* AAAA RDATA format
1 2 3
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
|-------------------------------------------------------------|
| ADDRESS |
|-------------------------------------------------------------|
| ADDRESS |
|-------------------------------------------------------------|
| ADDRESS |
|-------------------------------------------------------------|
| ADDRESS |
|-------------------------------------------------------------|
*/
typedef struct NX_DNS_IPV6_ADDRESS_STRUCT
{
ULONG ipv6_address[4];
} NX_DNS_IPV6_ADDRESS;
/* The return_buffer must be 4-byte aligned. This return buffer is used to store IP addresses returned from the server. */
/* The record_number in the query stores the number of entries in the buffer. If the server returns more entries than the buffer
can hold, the entries exceeding the buffer size are dropped. */
/* Layout of the buffer
|---------------------------------------------------------------|
|ip.address.0[0]|ip.address.0[1]|ip.address.0[2]|ip.address.0[3]|
|---------------------------------------------------------------|
|ip.address.1[0]|ip.address.1[1]|ip.address.1[2]|ip.address.1[3]|
|---------------------------------------------------------------|
| |
| .......................................... |
| |
|---------------------------------------------------------------|
|ip.address.n[0]|ip.address.n[1]|ip.address.n[2]|ip.address.n[3]|
|---------------------------------------------------------------|
*/
/********************************************************************************/
/* PTR */
/********************************************************************************/
/* PTR RDATA format
1 2 3
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
|-------------------------------------------------------------|
/ PTRDNAME /
/ /
|-------------------------------------------------------------|
*/
#ifdef NX_DNS_ENABLE_EXTENDED_RR_TYPES
/********************************************************************************/
/* Type NS */
/********************************************************************************/
/* NS RDATA format
1 2 3
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
|-------------------------------------------------------------|
/ NSDNAME /
/ /
|-------------------------------------------------------------|
*/
typedef struct NX_DNS_NS_ENTRY_STRUCT
{
ULONG nx_dns_ns_ipv4_address; /* The name server ipv4 address. */
UCHAR *nx_dns_ns_hostname_ptr; /* The name server. */
} NX_DNS_NS_ENTRY;
/* Store the message in one buffer. Layout of the buffer:
record_buffer |---------------------------------------------------------------|
entry 0 |xx.xx.xx.xx |Pointer to the host name string |
record_buffer + 8 |---------------------------------------------------------------|
entry 1 |xx.xx.xx.xx |Pointer to the host name string |
record_buffer + 16 |---------------------------------------------------------------|
entry 2 |xx.xx.xx.xx |Pointer to the host name string |
record_buffer + 24 |---------------------------------------------------------------|
entry 3 |xx.xx.xx.xx |Pointer to the host name string |
record_buffer + 32 |---------------------------------------------------------------|
entry 4 |xx.xx.xx.xx |Pointer to the host name string |
record_buffer + 40 |---------------------------------------------------------------|
|xx.xx.xx.xx |Pointer to the host name string |
|---------------------------------------------------------------|
| | ns_hostname 4 |
|ns_hostname 3 | ns_hostname 2 |
|ns_hostname 1 | ns_hostname 0 |
record_buffer + max |---------------------------------------------------------------|
*/
/********************************************************************************/
/* CNAME */
/********************************************************************************/
/* CNAME RDATA format
1 2 3
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
|-------------------------------------------------------------|
/ CNAME /
/ /
|-------------------------------------------------------------|
*/
/********************************************************************************/
/* MX */
/********************************************************************************/
/* MX RDATA format
1
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5
|-----------------------------|
| PREFERECE |
|-----------------------------|
/ EXCHANGE /
/ /
|-----------------------------|
*/
/* Define the mail exchange record type */
typedef struct NX_DNS_MAIL_EXCHANGE_ENTRY_STRUCT
{
ULONG nx_dns_mx_ipv4_address; /* The mail exchange server ipv4 address. */
USHORT nx_dns_mx_preference; /* The preference given to this RR, Lower values are preferred. */
USHORT nx_dns_mx_reserved0; /* Keep 4-byte aligned. */
UCHAR *nx_dns_mx_hostname_ptr; /* The mail exchange server host name. */
} NX_DNS_MX_ENTRY;
/* Layout of the buffer
record_buffer |---------------------------------------------------------|
entry 0 |xx.xx.xx.xx|preference|res|pointer to host name string |
record_buffer + 12 |---------------------------------------------------------|
entry 1 |xx.xx.xx.xx|preference|res|pointer to host name string |
record_buffer + 24 |---------------------------------------------------------|
entry 2 |xx.xx.xx.xx|preference|res|pointer to host name string |
record_buffer + 36 |---------------------------------------------------------|
entry 3 |xx.xx.xx.xx|preference|res|pointer to host name string |
record_buffer + 48 |---------------------------------------------------------|
entry 4 |xx.xx.xx.xx|preference|res|pointer to host name string |
record_buffer + 60 |---------------------------------------------------------|
|xx.xx.xx.xx|preference|res|pointer to host name string |
|---------------------------------------------------------|
| | mx_hostname 4 |
|mx_hostname 3 | mx_hostname 2 |
|mx_hostname 1 | mx_hostname 0 |
record_buffer + max |---------------------------------------------------------|
*/
/********************************************************************************/
/* SRV */
/********************************************************************************/
/* Define the service record type. */
typedef struct NX_DNS_SERVICE_ENTRY_STRUCT
{
ULONG nx_dns_srv_ipv4_address;
USHORT nx_dns_srv_priority;
USHORT nx_dns_srv_weight;
USHORT nx_dns_srv_port_number;
USHORT nx_dns_srv_reserved0;
UCHAR *nx_dns_srv_hostname_ptr;
} NX_DNS_SRV_ENTRY;
/* Layout of the buffer:
record_buffer |-------------------------------------------------------------------|
entry 0 |xx.xx.xx.xx|priority|weight|port|res|pointer to host name string |
record_buffer + 16 |-------------------------------------------------------------------|
entry 1 |xx.xx.xx.xx|priority|weight|port|res|pointer to host name string |
record_buffer + 32 |-------------------------------------------------------------------|
entry 2 |xx.xx.xx.xx|priority|weight|port|res|pointer to host name string |
record_buffer + 48 |-------------------------------------------------------------------|
entry 3 |xx.xx.xx.xx|priority|weight|port|res|pointer to host name string |
record_buffer + 64 |-------------------------------------------------------------------|
entry 4 |xx.xx.xx.xx|priority|weight|port|res|pointer to host name string |
record_buffer + 80 |-------------------------------------------------------------------|
|xx.xx.xx.xx|priority|weight|port|res|pointer to host name string |
| | srv_hostname 4 |
|srv_hostname 3 | srv_hostname 2 |
|srv_hostname 1 | srv_hostname 0 |
record_buffer + max |-------------------------------------------------------------------|
*/
/********************************************************************************/
/* TXT */
/********************************************************************************/
/* TXT RDATA format
1 2 3
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
|-------------------------------------------------------------|
/ TXT-DATA /
/ /
|-------------------------------------------------------------|
*/
/********************************************************************************/
/* SOA */
/********************************************************************************/
/* SOA RDATA format
1 2 3
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
|-------------------------------------------------------------|
/ MNAME /
/ /
|-------------------------------------------------------------|
/ RNAME /
/ /
|-------------------------------------------------------------|
| SERIAL |
|-------------------------------------------------------------|
| REFRESH |
|-------------------------------------------------------------|
| RETRY |
|-------------------------------------------------------------|
| EXPIRE |
|-------------------------------------------------------------|
| MINMUM |
|-------------------------------------------------------------|
*/
/* Define the service record type. */
typedef struct NX_DNS_SOA_ENTRY_STRUCT
{
UCHAR *nx_dns_soa_host_mname_ptr;
UCHAR *nx_dns_soa_host_rname_ptr;
ULONG nx_dns_soa_serial;
ULONG nx_dns_soa_refresh;
ULONG nx_dns_soa_retry;
ULONG nx_dns_soa_expire;
ULONG nx_dns_soa_minmum;
} NX_DNS_SOA_ENTRY;
/* Layout of the buffer
record_buffer
|-------------------------------------------------------------------|
| pointer to primary name server| pointer to responsible mailbox |
|-------------------------------------------------------------------|
| serial | refresh | retry | expire | minmum |
|-------------------------------------------------------------------|
| soa_host_mname | soa_host_rname |
|-------------------------------------------------------------------|
*/
/********************************************************************************/
/* LOC */
/********************************************************************************/
/* To be implemented */
/********************************************************************************/
/* NAPTR */
/********************************************************************************/
/* To be implemented */
/********************************************************************************/
/* DNAME */
/********************************************************************************/
/* To be implemented */
#endif
/* Define the RDATA structure. */
/* A RDATA format
0 1
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5
|--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--|
| ADDRESS |
| |
|--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--|
*/
typedef struct NX_DNS_RR_A_STRUCT
{
ULONG nx_dns_rr_a_address;
} NX_DNS_RR_A;
/* AAAA RDATA format
0 1
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5
|--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--|
| |
| |
| |
| IPv6 ADDRESS |
| |
| |
| |
| |
|--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--|
*/
typedef struct NX_DNS_RR_AAAA_STRUCT
{
ULONG* nx_dns_rr_aaaa_address; /* Keep the same resource record structure size, store the rdata information into cache with string. */
} NX_DNS_RR_AAAA;
/* PTR RDATA format
0 1
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5
|--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--|
/ PTRDNAME /
|--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--|
*/
typedef struct NX_DNS_RR_PTR_STRUCT
{
UCHAR* nx_dns_rr_ptr_name;
} NX_DNS_RR_PTR;
/* NS RDATA format
0 1
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5
|--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--|
/ NSDNAME /
/ /
|--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--|
*/
typedef struct NX_DNS_RR_NS_STRUCT
{
UCHAR* nx_dns_rr_ns_name;
} NX_DNS_RR_NS;
/* CNMAE RDATA format
0 1
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5
|--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--|
/ CNAME /
/ /
|--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--|
*/
typedef struct NX_DNS_RR_CNAME_STRUCT
{
UCHAR* nx_dns_rr_cname_name;
} NX_DNS_RR_CNAME;
/* MX RDATA format
0 1
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5
|--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--|
| PREFERENCE |
|--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--|
/ NEWNAME /
/ /
|--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--|
*/
typedef struct NX_DNS_RR_MX_STRUCT
{
UCHAR* nx_dns_rr_mx_rdata; /* Keep the same resource record structure size, store the rdata information into cache with string. "preference, newname" */
} NX_DNS_RR_MX;
/* TXT RDATA format
0 1
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5
|--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--|
/ TXT-DATA /
|--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--|
*/
typedef struct NX_DNS_RR_TXT_STRUCT
{
UCHAR* nx_dns_rr_txt_data;
} NX_DNS_RR_TXT;
/* SRV RDATA format
0 1
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5
|--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--|
| PRIORITY |
|--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--|
| WEIGHTS |
|--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--|
| PORT |
|--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--|
/ TARGET /
|--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--|
*/
typedef struct NX_DNS_RR_SRV_STRUCT
{
UCHAR* nx_dns_rr_srv_rdata; /* Keep the same resource record structure size, store the rdata information into cache with string, "priority, weights, port,target". */
} NX_DNS_RR_SRV;
/* SOA RDATA format
0 1
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5
|--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--|
/ MNAME /
/ /
|--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--|
/ RNAME /
|--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--|
| SERIAL |
| |
|--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--|
| REFRESH |
| |
|--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--|
| RETRY |
| |
|--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--|
| EXPIRE |
| |
|--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--|
| MINMUM |
| |
|--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--|
*/
typedef struct NX_DNS_RR_SOA_STRUCT
{
UCHAR* nx_dns_rr_soa_rdata; /* Keep the same resource record structure size, store the rdata information into cache with string.
"Mname, Rname, Serial, Refresh, Retry, Expire, Minmum" */
} NX_DNS_RR_SOA;
/* The following data structure is used to store the resource records(RRs). */
typedef struct NX_DNS_RR_STRUCT
{
UCHAR* nx_dns_rr_name; /* Owner's name,i.e., the name of the node to which this resource record pertains. */
USHORT nx_dns_rr_type; /* RR TYPE. */
USHORT nx_dns_rr_class; /* RR CLASS. */
ULONG nx_dns_rr_ttl; /* The time interval that the RR may be cached before the source of the information should again be consulted. */
ULONG nx_dns_rr_last_used_time; /* Define the last used time for the peer RR. */
/* Union that holds resource record data. */
union nx_dns_rr_rdata_union
{
NX_DNS_RR_A nx_dns_rr_rdata_a;
NX_DNS_RR_AAAA nx_dns_rr_rdata_aaaa;
NX_DNS_RR_PTR nx_dns_rr_rdata_ptr;
NX_DNS_RR_SRV nx_dns_rr_rdata_srv;
NX_DNS_RR_TXT nx_dns_rr_rdata_txt;
NX_DNS_RR_CNAME nx_dns_rr_rdata_cname;
NX_DNS_RR_NS nx_dns_rr_rdata_ns;
NX_DNS_RR_MX nx_dns_rr_rdata_mx;
NX_DNS_RR_SOA nx_dns_rr_rdata_soa;
} nx_dns_rr_rdata;
}NX_DNS_RR;
#ifndef NX_DNS_SOURCE_CODE
/* Application caller is present, perform API mapping. */
/* Determine if error checking is desired. If so, map API functions
to the appropriate error checking front-ends. Otherwise, map API
functions to the core functions that actually perform the work.
Note: error checking is enabled by default. */
#ifdef NX_DISABLE_ERROR_CHECKING
/* Services without error checking. */
#define nx_dns_create _nx_dns_create
#define nx_dns_delete _nx_dns_delete
#define nx_dns_packet_pool_set _nx_dns_packet_pool_set
#define nx_dns_host_by_address_get _nx_dns_host_by_address_get
#define nx_dns_host_by_name_get _nx_dns_host_by_name_get
#define nx_dns_ipv4_address_by_name_get _nx_dns_ipv4_address_by_name_get
#ifdef NX_DNS_ENABLE_EXTENDED_RR_TYPES
#define nx_dns_cname_get _nx_dns_cname_get
#define nx_dns_domain_name_server_get _nx_dns_domain_name_server_get
#define nx_dns_host_text_get _nx_dns_host_text_get
#define nx_dns_domain_mail_exchange_get _nx_dns_domain_mail_exchange_get
#define nx_dns_domain_service_get _nx_dns_domain_service_get
#define nx_dns_authority_zone_start_get _nx_dns_authority_zone_start_get
#define nx_dns_info_by_name_get _nx_dns_info_by_name_get
#endif
#define nx_dns_server_add _nx_dns_server_add
#define nx_dns_server_remove _nx_dns_server_remove
#define nx_dns_server_remove_all _nx_dns_server_remove_all
#define nx_dns_server_get _nx_dns_server_get
#define nx_dns_get_serverlist_size _nx_dns_get_serverlist_size
#define nxd_dns_ipv6_address_by_name_get _nxd_dns_ipv6_address_by_name_get
#define nxd_dns_host_by_address_get _nxd_dns_host_by_address_get
#define nxd_dns_host_by_name_get _nxd_dns_host_by_name_get
#define nxd_dns_server_add _nxd_dns_server_add
#define nxd_dns_server_remove _nxd_dns_server_remove
#define nxd_dns_server_get _nxd_dns_server_get
#ifdef NX_DNS_CACHE_ENABLE
#define nx_dns_cache_initialize _nx_dns_cache_initialize
#define nx_dns_cache_notify_set _nx_dns_cache_notify_set
#define nx_dns_cache_notify_clear _nx_dns_cache_notify_clear
#endif /* NX_DNS_CACHE_ENABLE */
#else
/* Services with error checking. */
#define nx_dns_create _nxe_dns_create
#define nx_dns_delete _nxe_dns_delete
#define nx_dns_packet_pool_set _nxe_dns_packet_pool_set
#define nx_dns_host_by_address_get _nxe_dns_host_by_address_get
#define nx_dns_host_by_name_get _nxe_dns_host_by_name_get
#define nx_dns_ipv4_address_by_name_get _nxe_dns_ipv4_address_by_name_get
#ifdef NX_DNS_ENABLE_EXTENDED_RR_TYPES
#define nx_dns_cname_get _nxe_dns_cname_get
#define nx_dns_domain_name_server_get _nxe_dns_domain_name_server_get
#define nx_dns_host_text_get _nxe_dns_host_text_get
#define nx_dns_domain_mail_exchange_get _nxe_dns_domain_mail_exchange_get
#define nx_dns_domain_service_get _nxe_dns_domain_service_get
#define nx_dns_authority_zone_start_get _nxe_dns_authority_zone_start_get
#define nx_dns_info_by_name_get _nxe_dns_info_by_name_get
#endif
#define nx_dns_server_add _nxe_dns_server_add
#define nx_dns_server_remove _nxe_dns_server_remove
#define nx_dns_server_remove_all _nxe_dns_server_remove_all
#define nx_dns_server_get _nxe_dns_server_get
#define nx_dns_get_serverlist_size _nxe_dns_get_serverlist_size
#define nxd_dns_ipv6_address_by_name_get _nxde_dns_ipv6_address_by_name_get
#define nxd_dns_host_by_address_get _nxde_dns_host_by_address_get
#define nxd_dns_host_by_name_get _nxde_dns_host_by_name_get
#define nxd_dns_server_add _nxde_dns_server_add
#define nxd_dns_server_remove _nxde_dns_server_remove
#define nxd_dns_server_get _nxde_dns_server_get
#ifdef NX_DNS_CACHE_ENABLE
#define nx_dns_cache_initialize _nxe_dns_cache_initialize
#define nx_dns_cache_notify_set _nxe_dns_cache_notify_set
#define nx_dns_cache_notify_clear _nxe_dns_cache_notify_clear
#endif /* NX_DNS_CACHE_ENABLE */
#endif
/* Define the prototypes accessible to the application software. */
UINT nx_dns_create(NX_DNS *dns_ptr, NX_IP *ip_ptr, UCHAR *domain_name);
UINT nx_dns_delete(NX_DNS *dns_ptr);
UINT nx_dns_packet_pool_set(NX_DNS *dns_ptr, NX_PACKET_POOL *packet_pool_ptr);
UINT nx_dns_server_add(NX_DNS *dns_ptr, ULONG server_address);
UINT nx_dns_server_remove(NX_DNS *dns_ptr, ULONG server_address);
UINT nx_dns_server_remove_all(NX_DNS *dns_ptr);
UINT nx_dns_server_get(NX_DNS *dns_ptr, UINT index, ULONG *dns_server_address);
UINT nx_dns_get_serverlist_size(NX_DNS *dns_ptr, UINT *server_list_size);
UINT nx_dns_host_by_name_get(NX_DNS *dns_ptr, UCHAR *host_name, ULONG *host_address_ptr, ULONG wait_option);
UINT nx_dns_host_by_address_get(NX_DNS *dns_ptr, ULONG ip_address, UCHAR *host_name_ptr, UINT host_name_buffer_size, ULONG wait_option);
UINT nx_dns_ipv4_address_by_name_get(NX_DNS *dns_ptr, UCHAR *host_name, VOID *record_buffer, UINT buffer_size, UINT *record_count, ULONG wait_option);
#ifdef NX_DNS_ENABLE_EXTENDED_RR_TYPES
UINT nx_dns_cname_get (NX_DNS *dns_ptr, UCHAR *host_name, UCHAR *record_buffer, UINT buffer_size, ULONG wait_option);
UINT nx_dns_domain_name_server_get(NX_DNS *dns_ptr, UCHAR *host_name, VOID *record_buffer, UINT buffer_size, UINT *record_count, ULONG wait_option);
UINT nx_dns_host_text_get(NX_DNS *dns_ptr, UCHAR *host_name, UCHAR *record_buffer, UINT buffer_size, ULONG wait_option);
UINT nx_dns_domain_mail_exchange_get(NX_DNS *dns_ptr, UCHAR *host_name, VOID *record_buffer, UINT buffer_size, UINT *record_count, ULONG wait_option);
UINT nx_dns_domain_service_get(NX_DNS *dns_ptr, UCHAR *host_name, VOID *record_buffer, UINT buffer_size, UINT *record_count, ULONG wait_option);
UINT nx_dns_authority_zone_start_get (NX_DNS *dns_ptr, UCHAR *host_name, UCHAR *record_buffer, UINT buffer_size, ULONG wait_option);
UINT nx_dns_info_by_name_get(NX_DNS *dns_ptr, UCHAR *host_name, ULONG *host_address_ptr, USHORT* host_port, ULONG wait_option);
#endif
UINT nxd_dns_ipv6_address_by_name_get(NX_DNS *dns_ptr, UCHAR *host_name, VOID *record_buffer, UINT buffer_size, UINT *record_count, ULONG wait_option);
UINT nxd_dns_host_by_address_get(NX_DNS *dns_ptr, NXD_ADDRESS *ip_address, UCHAR *host_name_ptr, UINT host_name_buffer_size, ULONG wait_option);
UINT nxd_dns_host_by_name_get(NX_DNS *dns_ptr, UCHAR *host_name, NXD_ADDRESS *host_address_ptr, ULONG wait_option, UINT lookup_type);
UINT nxd_dns_server_add(NX_DNS *dns_ptr, NXD_ADDRESS *dns_server_address);
UINT nxd_dns_server_remove(NX_DNS *dns_ptr, NXD_ADDRESS *server_address);
UINT nxd_dns_server_get(NX_DNS *dns_ptr, UINT index, NXD_ADDRESS *dns_server_address);
#ifdef NX_DNS_CACHE_ENABLE
UINT nx_dns_cache_initialize(NX_DNS *dns_ptr, VOID *cache_ptr, UINT cache_size);
UINT nx_dns_cache_notify_set(NX_DNS *dns_ptr, VOID (*cache_full_notify_cb)(NX_DNS *dns_ptr));
UINT nx_dns_cache_notify_clear(NX_DNS *dns_ptr);
#endif /* NX_DNS_CACHE_ENABLE */
#else
/* DNS source code is being compiled, do not perform any API mapping. */
UINT _nxe_dns_create(NX_DNS *dns_ptr, NX_IP *ip_ptr, UCHAR *domain_name);
UINT _nx_dns_create(NX_DNS *dns_ptr, NX_IP *ip_ptr, UCHAR *domain_name);
UINT _nxe_dns_delete(NX_DNS *dns_ptr);
UINT _nx_dns_delete(NX_DNS *dns_ptr);
UINT _nxe_dns_packet_pool_set(NX_DNS *dns_ptr, NX_PACKET_POOL *packet_pool_ptr);
UINT _nx_dns_packet_pool_set(NX_DNS *dns_ptr, NX_PACKET_POOL *packet_pool_ptr);
UINT _nxe_dns_host_by_address_get(NX_DNS *dns_ptr, ULONG ip_address, UCHAR *host_name_ptr, UINT host_name_buffer_size, ULONG wait_option);
UINT _nx_dns_host_by_address_get(NX_DNS *dns_ptr, ULONG ip_address, UCHAR *host_name_ptr, UINT host_name_buffer_size, ULONG wait_option);
UINT _nxe_dns_host_by_name_get(NX_DNS *dns_ptr, UCHAR *host_name, ULONG *host_address_ptr, ULONG wait_option);
UINT _nx_dns_host_by_name_get(NX_DNS *dns_ptr, UCHAR *host_name, ULONG *host_address_ptr, ULONG wait_option);
UINT _nxe_dns_ipv4_address_by_name_get(NX_DNS *dns_ptr, UCHAR *host_name, VOID *record_buffer, UINT buffer_size, UINT *record_count, ULONG wait_option);
UINT _nx_dns_ipv4_address_by_name_get(NX_DNS *dns_ptr, UCHAR *host_name, VOID *record_buffer, UINT buffer_size, UINT *record_count, ULONG wait_option);
#ifdef NX_DNS_ENABLE_EXTENDED_RR_TYPES
UINT _nxe_dns_cname_get (NX_DNS *dns_ptr, UCHAR *host_name, UCHAR *record_buffer, UINT buffer_size,ULONG wait_option);
UINT _nx_dns_cname_get (NX_DNS *dns_ptr, UCHAR *host_name, UCHAR *record_buffer, UINT buffer_size,ULONG wait_option);
UINT _nxe_dns_domain_name_server_get(NX_DNS *dns_ptr, UCHAR *host_name, VOID *record_buffer, UINT buffer_size, UINT *record_count, ULONG wait_option);
UINT _nx_dns_domain_name_server_get(NX_DNS *dns_ptr, UCHAR *host_name, VOID *record_buffer, UINT buffer_size, UINT *record_count, ULONG wait_option);
UINT _nxe_dns_host_text_get(NX_DNS *dns_ptr, UCHAR *host_name, UCHAR *record_buffer, UINT buffer_size, ULONG wait_option);
UINT _nx_dns_host_text_get(NX_DNS *dns_ptr, UCHAR *host_name, UCHAR *record_buffer, UINT buffer_size, ULONG wait_option);
UINT _nxe_dns_domain_mail_exchange_get(NX_DNS *dns_ptr, UCHAR *host_name, VOID *record_buffer, UINT buffer_size, UINT *record_count, ULONG wait_option);
UINT _nx_dns_domain_mail_exchange_get(NX_DNS *dns_ptr, UCHAR *host_name, VOID *record_buffer, UINT buffer_size, UINT *record_count, ULONG wait_option);
UINT _nxe_dns_domain_service_get(NX_DNS *dns_ptr, UCHAR *host_name, VOID *record_buffer, UINT buffer_size, UINT *record_count, ULONG wait_option);
UINT _nx_dns_domain_service_get(NX_DNS *dns_ptr, UCHAR *host_name, VOID *record_buffer, UINT buffer_size, UINT *record_count, ULONG wait_option);
UINT _nxe_dns_authority_zone_start_get (NX_DNS *dns_ptr, UCHAR *host_name, UCHAR *record_buffer, UINT buffer_size, ULONG wait_option);
UINT _nx_dns_authority_zone_start_get (NX_DNS *dns_ptr, UCHAR *host_name, UCHAR *record_buffer, UINT buffer_size, ULONG wait_option);
UINT _nxe_dns_info_by_name_get(NX_DNS *dns_ptr, UCHAR *host_name, ULONG *host_address_ptr, USHORT* host_port, ULONG wait_option);
UINT _nx_dns_info_by_name_get(NX_DNS *dns_ptr, UCHAR *host_name, ULONG *host_address_ptr, USHORT* host_port, ULONG wait_option);
#endif
UINT _nxe_dns_server_add(NX_DNS *dns_ptr, ULONG server_address);
UINT _nx_dns_server_add(NX_DNS *dns_ptr, ULONG server_address);
UINT _nxe_dns_server_remove(NX_DNS *dns_ptr, ULONG server_address);
UINT _nx_dns_server_remove(NX_DNS *dns_ptr, ULONG server_address);
UINT _nxe_dns_server_remove_all(NX_DNS *dns_ptr);
UINT _nx_dns_server_remove_all(NX_DNS *dns_ptr);
UINT _nxe_dns_server_get(NX_DNS *dns_ptr, UINT index, ULONG *dns_server_address);
UINT _nx_dns_server_get(NX_DNS *dns_ptr, UINT index, ULONG *dns_server_address);
UINT _nxe_dns_get_serverlist_size(NX_DNS *dns_ptr, UINT *server_list_size);
UINT _nx_dns_get_serverlist_size(NX_DNS *dns_ptr, UINT *server_list_size);
UINT _nxde_dns_ipv6_address_by_name_get(NX_DNS *dns_ptr, UCHAR *host_name, VOID *record_buffer, UINT buffer_size, UINT *record_count, ULONG wait_option);
UINT _nxd_dns_ipv6_address_by_name_get(NX_DNS *dns_ptr, UCHAR *host_name, VOID *record_buffer, UINT buffer_size, UINT *record_count, ULONG wait_option);
UINT _nxde_dns_host_by_address_get(NX_DNS *dns_ptr, NXD_ADDRESS *host_address_ptr, UCHAR *host_name_ptr, UINT host_name_buffer_size, ULONG wait_option);
UINT _nxd_dns_host_by_address_get(NX_DNS *dns_ptr, NXD_ADDRESS *host_address_ptr, UCHAR *host_name_ptr, UINT host_name_buffer_size, ULONG wait_option);
UINT _nxde_dns_host_by_name_get(NX_DNS *dns_ptr, UCHAR *host_name, NXD_ADDRESS *host_address_ptr, ULONG wait_option, UINT lookup_type);
UINT _nxd_dns_host_by_name_get(NX_DNS *dns_ptr, UCHAR *host_name, NXD_ADDRESS *host_address_ptr, ULONG wait_option, UINT lookup_type);
UINT _nxde_dns_server_add(NX_DNS *dns_ptr, NXD_ADDRESS *server_address);
UINT _nxd_dns_server_add(NX_DNS *dns_ptr, NXD_ADDRESS *server_address);
UINT _nxde_dns_server_remove(NX_DNS *dns_ptr, NXD_ADDRESS *server_address);
UINT _nxd_dns_server_remove(NX_DNS *dns_ptr, NXD_ADDRESS *server_address);
UINT _nxde_dns_server_get(NX_DNS *dns_ptr, UINT index, NXD_ADDRESS *dns_server_address);
UINT _nxd_dns_server_get(NX_DNS *dns_ptr, UINT index, NXD_ADDRESS *dns_server_address);
#ifdef NX_DNS_CACHE_ENABLE
UINT _nxe_dns_cache_initialize(NX_DNS *dns_ptr, VOID *cache_ptr, UINT cache_size);
UINT _nx_dns_cache_initialize(NX_DNS *dns_ptr, VOID *cache_ptr, UINT cache_size);
UINT _nxe_dns_cache_notify_set(NX_DNS *dns_ptr, VOID (*cache_full_notify_cb)(NX_DNS *dns_ptr));
UINT _nx_dns_cache_notify_set(NX_DNS *dns_ptr, VOID (*cache_full_notify_cb)(NX_DNS *dns_ptr));
UINT _nxe_dns_cache_notify_clear(NX_DNS *dns_ptr);
UINT _nx_dns_cache_notify_clear(NX_DNS *dns_ptr);
#endif /* NX_DNS_CACHE_ENABLE */
#endif
/* Internal DNS response getting function. */
UINT _nx_dns_response_get(NX_DNS *dns_ptr, UCHAR *host_name, UCHAR *record_buffer, UINT buffer_size,
UINT *record_count, ULONG wait_option);
/* Determine if a C++ compiler is being used. If so, complete the standard
C conditional started above. */
#ifdef __cplusplus
}
#endif
#endif /* NXD_DNS_H */