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 static property

Gets list of OPENDNS servers

public static List DefaultDnsServers
return	List