C# Class Heijden.DNS.Resolver

Resolver is the main class to do DNS query lookups

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Public Properties

Property	Type	Description
DefaultDnsServers	List

Public Methods

Method	Description
BeginGetHostEntry ( IPAddress ip, AsyncCallback requestCallback, object stateObject ) : IAsyncResult	Asynchronously resolves an IP address to an System.Net.IPHostEntry instance.
BeginGetHostEntry ( string hostNameOrAddress, AsyncCallback requestCallback, object stateObject ) : IAsyncResult	Asynchronously resolves a host name or IP address to an System.Net.IPHostEntry instance.
ClearCache ( ) : void	Clear the resolver cache
EndGetHostEntry ( IAsyncResult AsyncResult ) : IPHostEntry	Ends an asynchronous request for DNS information.
GetArpaFromIp ( IPAddress ip ) : string	Translates the IPV4 or IPV6 address into an arpa address
GetDnsServers ( ) : System.Net.IPEndPoint[]	Gets a list of default DNS servers used on the Windows machine.
GetHostEntry ( IPAddress ip ) : IPHostEntry	Resolves an IP address to an System.Net.IPHostEntry instance.
GetHostEntry ( string hostNameOrAddress ) : IPHostEntry	Resolves a host name or IP address to an System.Net.IPHostEntry instance.
Query ( string name, DNSQType qtype, QClass qclass, int timeout ) : Heijden.DNS.DNSResponse	Do Query on specified DNS servers
Query ( string name, DNSQType qtype, int timeout ) : Heijden.DNS.DNSResponse	Do an QClass=IN Query on specified DNS servers
Query ( string name, DNSQType qtype, int timeout, List dnsServers ) : Heijden.DNS.DNSResponse
QueryCache ( string name, DNSQType qtype ) : Heijden.DNS.DNSResponse	Do an QClass=IN Query on the previously cached results.
QueryCache ( string name, DNSQType qtype, QClass qclass ) : Heijden.DNS.DNSResponse	Do an QClass=IN Query on the previously cached results.
Resolver ( ) : System	Resolver constructor, using DNS servers specified by Windows
Resolver ( IPAddress ServerIpAddress, int ServerPortNumber ) : System	Constructor of Resolver using DNS server and port specified.
Resolver ( IPEndPoint DnsServers ) : System	Constructor of Resolver using DNS servers specified.
Resolver ( string ServerIpAddress ) : System	Constructor of Resolver using DNS address.
Resolver ( string ServerIpAddress, int ServerPortNumber ) : System	Constructor of Resolver using DNS address and port specified.

Private Methods

Method	Description
AddToCache ( Heijden.DNS.DNSResponse response, string questionKey ) : void
GetActiveDNSServer ( ) : IPEndPoint
GetResponse ( Heijden.DNS.DNSRequest request, List dnsServers, int timeout ) : Heijden.DNS.DNSResponse
IncrementTimeoutCount ( IPEndPoint dnsServer ) : void
MakeEntry ( string HostName, int timeout ) : IPHostEntry
ResetTimeoutCount ( IPEndPoint dnsServer ) : void
SearchInCache ( Question question ) : Heijden.DNS.DNSResponse
TcpRequest ( Heijden.DNS.DNSRequest request, List dnsServers, int timeout ) : Heijden.DNS.DNSResponse
UdpRequest ( Heijden.DNS.DNSRequest request, List dnsServers, int timeout ) : Heijden.DNS.DNSResponse
Verbose ( string format ) : void

Method Details

BeginGetHostEntry() public method

Asynchronously resolves an IP address to an System.Net.IPHostEntry instance.

public BeginGetHostEntry ( IPAddress ip, AsyncCallback requestCallback, object stateObject ) : IAsyncResult
ip	System.Net.IPAddress	The IP address to resolve.
requestCallback	AsyncCallback	/// An System.AsyncCallback delegate that references the method to invoke when /// the operation is complete. ///
stateObject	object	/// A user-defined object that contains information about the operation. This /// object is passed to the requestCallback delegate when the operation is complete. ///
return	IAsyncResult

BeginGetHostEntry() public method

Asynchronously resolves a host name or IP address to an System.Net.IPHostEntry instance.

public BeginGetHostEntry ( string hostNameOrAddress, AsyncCallback requestCallback, object stateObject ) : IAsyncResult
hostNameOrAddress	string	The host name or IP address to resolve.
requestCallback	AsyncCallback	/// An System.AsyncCallback delegate that references the method to invoke when /// the operation is complete. ///
stateObject	object	/// A user-defined object that contains information about the operation. This /// object is passed to the requestCallback delegate when the operation is complete. ///
return	IAsyncResult

ClearCache() public method

Clear the resolver cache

public ClearCache ( ) : void
return	void

EndGetHostEntry() public method

Ends an asynchronous request for DNS information.

public EndGetHostEntry ( IAsyncResult AsyncResult ) : IPHostEntry
AsyncResult	IAsyncResult	/// An System.IAsyncResult instance returned by a call to an /// Overload:Heijden.Dns.Resolver.BeginGetHostEntry method. ///
return	System.Net.IPHostEntry

GetArpaFromIp() public static method

Translates the IPV4 or IPV6 address into an arpa address

public static GetArpaFromIp ( IPAddress ip ) : string
ip	System.Net.IPAddress	IP address to get the arpa address form
return	string

GetDnsServers() public static method

Gets a list of default DNS servers used on the Windows machine.

public static GetDnsServers ( ) : System.Net.IPEndPoint[]
return	System.Net.IPEndPoint[]

GetHostEntry() public method

Resolves an IP address to an System.Net.IPHostEntry instance.

public GetHostEntry ( IPAddress ip ) : IPHostEntry
ip	System.Net.IPAddress	An IP address.
return	System.Net.IPHostEntry

GetHostEntry() public method

Resolves a host name or IP address to an System.Net.IPHostEntry instance.

public GetHostEntry ( string hostNameOrAddress ) : IPHostEntry
hostNameOrAddress	string	The host name or IP address to resolve.
return	System.Net.IPHostEntry

Query() public method

Do Query on specified DNS servers

public Query ( string name, DNSQType qtype, QClass qclass, int timeout ) : Heijden.DNS.DNSResponse
name	string	Name to query
qtype	DNSQType	Question type
qclass	QClass	Class type
timeout	int	Timeout for lookup in seconds.
return	Heijden.DNS.DNSResponse

Query() public method

Do an QClass=IN Query on specified DNS servers

public Query ( string name, DNSQType qtype, int timeout ) : Heijden.DNS.DNSResponse
name	string	Name to query
qtype	DNSQType	Question type
timeout	int	Timeout for lookup in seconds.
return	Heijden.DNS.DNSResponse

Query() public method

public Query ( string name, DNSQType qtype, int timeout, List dnsServers ) : Heijden.DNS.DNSResponse
name	string
qtype	DNSQType
timeout	int
dnsServers	List
return	Heijden.DNS.DNSResponse

QueryCache() public method

Do an QClass=IN Query on the previously cached results.

public QueryCache ( string name, DNSQType qtype ) : Heijden.DNS.DNSResponse
name	string	Name to query
qtype	DNSQType	Question type
return	Heijden.DNS.DNSResponse

QueryCache() public method

Do an QClass=IN Query on the previously cached results.

public QueryCache ( string name, DNSQType qtype, QClass qclass ) : Heijden.DNS.DNSResponse
name	string	Name to query
qtype	DNSQType	Question type
qclass	QClass
return	Heijden.DNS.DNSResponse

Resolver() public method

Resolver constructor, using DNS servers specified by Windows

public Resolver ( ) : System
return	System

Resolver() public method

Constructor of Resolver using DNS server and port specified.

public Resolver ( IPAddress ServerIpAddress, int ServerPortNumber ) : System
ServerIpAddress	System.Net.IPAddress	DNS server to use
ServerPortNumber	int	DNS port to use
return	System

Resolver() public method

Constructor of Resolver using DNS servers specified.

public Resolver ( IPEndPoint DnsServers ) : System
DnsServers	System.Net.IPEndPoint	Set of DNS servers
return	System

Resolver() public method

Constructor of Resolver using DNS address.

public Resolver ( string ServerIpAddress ) : System
ServerIpAddress	string	DNS server address to use
return	System

Resolver() public method

Constructor of Resolver using DNS address and port specified.

public Resolver ( string ServerIpAddress, int ServerPortNumber ) : System
ServerIpAddress	string	DNS server address to use
ServerPortNumber	int	DNS port to use
return	System

Property Details

DefaultDnsServers public_oe static_oe property

Gets list of OPENDNS servers

public static List DefaultDnsServers
return	List