Data Structures
struct	EFI_DNS4_CONFIG_DATA

struct	EFI_DNS4_CACHE_ENTRY

struct	EFI_DNS4_MODE_DATA

struct	DNS_HOST_TO_ADDR_DATA

struct	DNS_ADDR_TO_HOST_DATA

struct	DNS_RESOURCE_RECORD

struct	DNS_GENERAL_LOOKUP_DATA

struct	EFI_DNS4_COMPLETION_TOKEN

struct	_EFI_DNS4_PROTOCOL

Macros
#define	EFI_DNS4_SERVICE_BINDING_PROTOCOL_GUID

#define	EFI_DNS4_PROTOCOL_GUID

Typedefs
typedef struct _EFI_DNS4_PROTOCOL	EFI_DNS4_PROTOCOL

typedef OUT EFI_DNS4_MODE_DATA *	DnsModeData

typedef IN EFI_DNS4_CONFIG_DATA *	DnsConfigData

typedef IN CHAR16 *	HostName

typedef IN CHAR16 IN EFI_DNS4_COMPLETION_TOKEN *	Token

typedef IN EFI_IPv4_ADDRESS	IpAddress

typedef IN CHAR8 *	QName

typedef IN CHAR8 IN UINT16	QType

typedef IN CHAR8 IN UINT16 IN UINT16	QClass

typedef IN BOOLEAN	DeleteFlag

typedef IN BOOLEAN IN BOOLEAN	Override

typedef IN BOOLEAN IN BOOLEAN IN EFI_DNS4_CACHE_ENTRY	DnsCacheEntry

Functions
typedef	EFI_STATUS (EFIAPI EFI_DNS4_GET_MODE_DATA)(IN EFI_DNS4_PROTOCOL This

Variables
EFI_GUID	gEfiDns4ServiceBindingProtocolGuid

EFI_GUID	gEfiDns4ProtocolGuid

Detailed Description

This file defines the EFI Domain Name Service Binding Protocol interface. It is split into the following two main sections: DNSv4 Service Binding Protocol (DNSv4SB) DNSv4 Protocol (DNSv4)

Copyright (c) 2015 - 2018, Intel Corporation. All rights reserved.
SPDX-License-Identifier: BSD-2-Clause-Patent

Revision Reference:: This Protocol is introduced in UEFI Specification 2.5

Macro Definition Documentation

#define EFI_DNS4_PROTOCOL_GUID

Value:

{ \
    0xae3d28cc, 0xe05b, 0x4fa1, {0xa0, 0x11, 0x7e, 0xb5, 0x5a, 0x3f, 0x14, 0x1 } \
  }

#define EFI_DNS4_SERVICE_BINDING_PROTOCOL_GUID

Value:

{ \
    0xb625b186, 0xe063, 0x44f7, {0x89, 0x5, 0x6a, 0x74, 0xdc, 0x6f, 0x52, 0xb4 } \
  }

Typedef Documentation

typedef IN BOOLEAN DeleteFlag

typedef IN BOOLEAN IN BOOLEAN IN EFI_DNS4_CACHE_ENTRY DnsCacheEntry

typedef IN EFI_DNS4_CONFIG_DATA* DnsConfigData

typedef OUT EFI_DNS4_MODE_DATA* DnsModeData

typedef struct _EFI_DNS4_PROTOCOL EFI_DNS4_PROTOCOL

typedef IN CHAR16* HostName

typedef IN EFI_IPv4_ADDRESS IpAddress

typedef IN BOOLEAN IN BOOLEAN Override

typedef IN CHAR8 IN UINT16 IN UINT16 QClass

typedef IN CHAR8* QName

typedef IN CHAR8 IN UINT16 QType

typedef IN EFI_DNS4_COMPLETION_TOKEN* Token

Function Documentation

typedef EFI_STATUS ( EFIAPI * EFI_DNS4_CANCEL )

Retrieve mode data of this DNS instance.

This function is used to retrieve DNS mode data for this DNS instance.

Parameters

[in]	This	Pointer to EFI_DNS4_PROTOCOL instance.
[out]	DnsModeData	Point to the mode data.

Return values

EFI_SUCCESS	The operation completed successfully.
EFI_NOT_STARTED	When DnsConfigData is queried, no configuration data is available because this instance has not been configured.
EFI_INVALID_PARAMETER	This is NULL or DnsModeData is NULL.
EFI_OUT_OF_RESOURCES	Failed to allocate needed resources.

Configure this DNS instance.

This function is used to configure DNS mode data for this DNS instance.

Parameters

[in]	This	Pointer to EFI_DNS4_PROTOCOL instance.
[in]	DnsConfigData	Point to the Configuration data.

Return values

EFI_SUCCESS	The operation completed successfully.
EFI_UNSUPPORTED	The designated protocol is not supported.
EFI_INVALID_PARAMETER	This is NULL. The StationIp address provided in DnsConfigData is not a valid unicast. DnsServerList is NULL while DnsServerListCount is not ZERO. DnsServerListCount is ZERO while DnsServerList is not NULL
EFI_OUT_OF_RESOURCES	The DNS instance data or required space could not be allocated.
EFI_DEVICE_ERROR	An unexpected system or network error occurred. The EFI DNSv4 Protocol instance is not configured.
EFI_ALREADY_STARTED	Second call to Configure() with DnsConfigData. To reconfigure the instance the caller must call Configure() with NULL first to return driver to unconfigured state.

Host name to host address translation.

The HostNameToIp () function is used to translate the host name to host IP address. A type A query is used to get the one or more IP addresses for this host.

Parameters

[in]	This	Pointer to EFI_DNS4_PROTOCOL instance.
[in]	HostName	Host name.
[in]	Token	Point to the completion token to translate host name to host address.

Return values

EFI_SUCCESS	The operation completed successfully.
EFI_INVALID_PARAMETER	One or more of the following conditions is TRUE: This is NULL. Token is NULL. Token.Event is NULL. HostName is NULL. HostName string is unsupported format.
EFI_NO_MAPPING	There's no source address is available for use.
EFI_NOT_STARTED	This instance has not been started.

IPv4 address to host name translation also known as Reverse DNS lookup.

The IpToHostName() function is used to translate the host address to host name. A type PTR query is used to get the primary name of the host. Support of this function is optional.

Parameters

[in]	This	Pointer to EFI_DNS4_PROTOCOL instance.
[in]	IpAddress	Ip Address.
[in]	Token	Point to the completion token to translate host address to host name.

Return values

EFI_SUCCESS	The operation completed successfully.
EFI_UNSUPPORTED	This function is not supported.
EFI_INVALID_PARAMETER	One or more of the following conditions is TRUE: This is NULL. Token is NULL. Token.Event is NULL. IpAddress is not valid IP address .
EFI_NO_MAPPING	There's no source address is available for use.
EFI_ALREADY_STARTED	This Token is being used in another DNS session.
EFI_OUT_OF_RESOURCES	Failed to allocate needed resources.

Retrieve arbitrary information from the DNS server.

This GeneralLookup() function retrieves arbitrary information from the DNS. The caller supplies a QNAME, QTYPE, and QCLASS, and all of the matching RRs are returned. All RR content (e.g., TTL) was returned. The caller need parse the returned RR to get required information. The function is optional.

Parameters

[in]	This	Pointer to EFI_DNS4_PROTOCOL instance.
[in]	QName	Pointer to Query Name.
[in]	QType	Query Type.
[in]	QClass	Query Name.
[in]	Token	Point to the completion token to retrieve arbitrary information.

Return values

EFI_SUCCESS	The operation completed successfully.
EFI_UNSUPPORTED	This function is not supported. Or the requested QType is not supported
EFI_INVALID_PARAMETER	One or more of the following conditions is TRUE: This is NULL. Token is NULL. Token.Event is NULL. QName is NULL.
EFI_NO_MAPPING	There's no source address is available for use.
EFI_ALREADY_STARTED	This Token is being used in another DNS session.
EFI_OUT_OF_RESOURCES	Failed to allocate needed resources.

This function is to update the DNS Cache.

The UpdateDnsCache() function is used to add/delete/modify DNS cache entry. DNS cache can be normally dynamically updated after the DNS resolve succeeds. This function provided capability to manually add/delete/modify the DNS cache.

Parameters

[in]	This	Pointer to EFI_DNS4_PROTOCOL instance.
[in]	DeleteFlag	If FALSE, this function is to add one entry to the DNS Cahce. If TRUE, this function will delete matching DNS Cache entry.
[in]	Override	If TRUE, the maching DNS cache entry will be overwritten with the supplied parameter. If FALSE, EFI_ACCESS_DENIED will be returned if the entry to be added is already existed.
[in]	DnsCacheEntry	Pointer to DNS Cache entry.

Return values

EFI_SUCCESS	The operation completed successfully.
EFI_INVALID_PARAMETER	One or more of the following conditions is TRUE: This is NULL. DnsCacheEntry.HostName is NULL. DnsCacheEntry.IpAddress is NULL. DnsCacheEntry.Timeout is zero.
EFI_ACCESS_DENIED	The DNS cache entry already exists and Override is not TRUE.

Polls for incoming data packets and processes outgoing data packets.

The Poll() function can be used by network drivers and applications to increase the rate that data packets are moved between the communications device and the transmit and receive queues. In some systems, the periodic timer event in the managed network driver may not poll the underlying communications device fast enough to transmit and/or receive all data packets without missing incoming packets or dropping outgoing packets. Drivers and applications that are experiencing packet loss should try calling the Poll() function more often.

Parameters

[in] This Pointer to EFI_DNS4_PROTOCOL instance.

Return values

EFI_SUCCESS	Incoming or outgoing data was processed.
EFI_NOT_STARTED	This EFI DNS Protocol instance has not been started.
EFI_INVALID_PARAMETER	This is NULL.
EFI_DEVICE_ERROR	An unexpected system or network error occurred.
EFI_TIMEOUT	Data was dropped out of the transmit and/or receive queue. Consider increasing the polling rate.

Abort an asynchronous DNS operation, including translation between IP and Host, and general look up behavior.

The Cancel() function is used to abort a pending resolution request. After calling this function, Token.Status will be set to EFI_ABORTED and then Token.Event will be signaled. If the token is not in one of the queues, which usually means that the asynchronous operation has completed, this function will not signal the token and EFI_NOT_FOUND is returned.

Parameters

[in]	This	Pointer to EFI_DNS4_PROTOCOL instance.
[in]	Token	Pointer to a token that has been issued by EFI_DNS4_PROTOCOL.HostNameToIp (), EFI_DNS4_PROTOCOL.IpToHostName() or EFI_DNS4_PROTOCOL.GeneralLookup(). If NULL, all pending tokens are aborted.

Return values

EFI_SUCCESS	Incoming or outgoing data was processed.
EFI_NOT_STARTED	This EFI DNS4 Protocol instance has not been started.
EFI_INVALID_PARAMETER	This is NULL.
EFI_NOT_FOUND	When Token is not NULL, and the asynchronous DNS operation was not found in the transmit queue. It was either completed or was not issued by HostNameToIp(), IpToHostName() or GeneralLookup().

Variable Documentation

EFI_GUID gEfiDns4ProtocolGuid

EFI_GUID gEfiDns4ServiceBindingProtocolGuid

Data Structures

Macros

Typedefs

Functions

Variables

Detailed Description

Macro Definition Documentation

Typedef Documentation

Function Documentation

Variable Documentation