DnDns and PocketDnDns - A .NET DNS Client Resolver Library

New Post: Does your stack support DNS SRV?

jmonty — Fri, 26 Feb 2010 14:31:19 GMT

Change has been checked in.

Source code checked in, #43733

jmonty — Fri, 26 Feb 2010 14:29:56 GMT

Added check to Tools.DiscoverDnsServerAddresses() to make sure it only returns IPv4 DNS servers. Thanks for code submission N. Young.

New Post: Does your stack support DNS SRV?

jmonty — Thu, 25 Feb 2010 19:55:54 GMT

Ahh, great point. Will do.

New Post: Does your stack support DNS SRV?

neilyoung — Wed, 24 Feb 2010 16:34:54 GMT

public static IPAddressCollection DiscoverDnsServerAddresses()

{

NetworkInterface[] arrNetworkInterfaces = NetworkInterface.GetAllNetworkInterfaces();

foreach (NetworkInterface objNetworkInterface in arrNetworkInterfaces)

{

if (

(objNetworkInterface.OperationalStatus == OperationalStatus.Up) &&

(objNetworkInterface.Speed > 0) &&

(objNetworkInterface.NetworkInterfaceType != NetworkInterfaceType.Loopback)&&

(objNetworkInterface.NetworkInterfaceType != NetworkInterfaceType.Tunnel)

)

{

IPAddressCollection candidate = objNetworkInterface.GetIPProperties().DnsAddresses;

bool found = false;

foreach (IPAddress addr in candidate) {

if (addr.AddressFamily == AddressFamily.InterNetwork)

found = true;

}

if (found)

return candidate;

}

return null;

}

Hi,

I would suggest you to change DiscoverDnsServerAddresses in Tools.cs accordingly. Otherwise there is a chance to return IPV6 addresses, which doesn't relly work right now :)

public static IPAddressCollection DiscoverDnsServerAddresses()

{

NetworkInterface[] arrNetworkInterfaces = NetworkInterface.GetAllNetworkInterfaces();

foreach (NetworkInterface objNetworkInterface in arrNetworkInterfaces)

{

if (

(objNetworkInterface.OperationalStatus == OperationalStatus.Up) &&

(objNetworkInterface.Speed > 0) &&

(objNetworkInterface.NetworkInterfaceType != NetworkInterfaceType.Loopback)&&

(objNetworkInterface.NetworkInterfaceType != NetworkInterfaceType.Tunnel)

)

{

IPAddressCollection candidate = objNetworkInterface.GetIPProperties().DnsAddresses;

bool found = false;

foreach (IPAddress addr in candidate) {

if (addr.AddressFamily == AddressFamily.InterNetwork)

found = true;

}

if (found)

return candidate;

}

return null;

}

Updated Wiki: Home

jmonty — Tue, 23 Feb 2010 15:56:24 GMT

Project Description
A DNS protocol library written completely in managed code (C#). Supports common DNS records types like A, CNAME, MX, SRV, and more. Works on Windows .NET 2.0, Mono 2.0, and .NET CF 2.0 for Pocket PC / Windows Mobile. Supports DNS resoluiton using both UDP and TCP protocols.

Background Information (my blog)
http://securitythroughabsurdity.com/2008/02/dndns-net-dns-client-library-resolver.html.

On Pocket DnDns (my blog)
http://securitythroughabsurdity.com/2008/12/pocket-dndns-release-1.html.

DnDns Supported Record Types
AAAA, AFSDB, A, ATMA, CNAME, HINFO, ISDN, LOC, MB, , MG, MINFO, MR, MX, NS, PTR, RP, RT, SOA, SRV, TXT, WKS, X25

Acknowledgments
N. Young - Provided initial code for TCP support.
A. Westerhold - linux/unix DNS server detection
Stefano - for finding a series of bugs casting from bytes to short
and others for reporting bug fixes. Thanks!

dndns_pad_file.xml

Updated Wiki: Home

jmonty — Tue, 23 Feb 2010 15:54:18 GMT

Project Description
A DNS protocol library written completely in managed code (C#). Supports common DNS records types like A, CNAME, MX, SRV, and more. Works on Windows .NET 2.0, Mono 2.0, and .NET CF 2.0 for Pocket PC / Windows Mobile. Supports DNS resoluiton using both UDP and TCP protocols.

Background Information (my blog)
http://securitythroughabsurdity.com/2008/02/dndns-net-dns-client-library-resolver.html.

On Pocket DnDns (my blog)
http://securitythroughabsurdity.com/2008/12/pocket-dndns-release-1.html.

DnDns Supported Record Types
AAAA, AFSDB, A, ATMA, CNAME, HINFO, ISDN, LOC, MB, , MG, MINFO, MR, MX, NS, PTR, RP, RT, SOA, SRV, TXT, WKS, X25

Acknowledgments
N. Young - Provided initial code for TCP support.
A. Westerhold - linux/unix DNS server detection
and others for reporting bug fixes. Thanks!

dndns_pad_file.xml

Updated Wiki: Home

jmonty — Tue, 23 Feb 2010 15:53:02 GMT

Project Description
A DNS protocol library written completely in managed code (C#). Supports common DNS records types like A, CNAME, MX, SRV, and more. Works on Windows .NET 2.0, Mono 2.0, and .NET CF 2.0 for Pocket PC / Windows Mobile. Supports DNS resoluiton using both UDP and TCP protocols.

Background Information (my blog)
http://securitythroughabsurdity.com/2008/02/dndns-net-dns-client-library-resolver.html.

On Pocket DnDns (my blog)
http://securitythroughabsurdity.com/2008/12/pocket-dndns-release-1.html.

DnDns Supported Record Types
AAAA, AFSDB, A, ATMA, CNAME, HINFO, ISDN, LOC, MB, , MG, MINFO, MR, MX, NS, PTR, RP, RT, SOA, SRV, TXT, WKS, X25

Acknowledgments
N. Young - Provided initial code for TCP support.
A. Westerhold - linux/unix DNS server detection
and others for reporting bug fixes. Thanks!

dndns_pad_file.xml

Updated Wiki: Home

jmonty — Tue, 23 Feb 2010 15:52:53 GMT

Project Description
A DNS protocol library written completely in managed code (C#). Supports common DNS records types like A, CNAME, MX, SRV, and more. Works on Windows .NET 2.0, Mono 2.0, and .NET CF 2.0 for Pocket PC / Windows Mobile. Supports DNS resoluiton using both UDP and TCP protocols.

Background Information (my blog)
http://securitythroughabsurdity.com/2008/02/dndns-net-dns-client-library-resolver.html.

On Pocket DnDns (my blog)
http://securitythroughabsurdity.com/2008/12/pocket-dndns-release-1.html.

DnDns Supported Record Types
AAAA, AFSDB, A,ATMA, CNAME, HINFO, ISDN, LOC, MB, , MG, MINFO, MR, MX, NS, PTR, RP, RT, SOA, SRV, TXT, WKS, X25

Acknowledgments
N. Young - Provided initial code for TCP support.
A. Westerhold - linux/unix DNS server detection
and others for reporting bug fixes. Thanks!

dndns_pad_file.xml

Updated Wiki: Home

jmonty — Tue, 23 Feb 2010 15:51:57 GMT

AAAA
AFSDB
A
ATMA
CNAME
HINFO
ISDN
LOC
MB
MG
MINFO
MR
MX
NS
PTR
RP
RT
SOA
SRV
TXT
WKS
X25

Acknowledgments
N. Young - Provided initial code for TCP support.
A. Westerhold - linux/unix DNS server detection

and others for reporting bug fixes. Thanks!

dndns_pad_file.xml

Updated Wiki: Home

jmonty — Tue, 23 Feb 2010 15:49:50 GMT

Project Description
A DNS protocol library written completely in managed code (C#). Supports common DNS records types like A, CNAME, MX, SRV, and more. Works on Windows .NET 2.0, Mono 2.0, and .NET CF 2.0 for Pocket PC / Windows Mobile. Supports DNS resoluiton using both UDP and TCP protocols.

Download the latest changeset here:
http://dndns.codeplex.com/SourceControl/list/changesets#

This library is also used by the DnSmtp http://www.codeplex.com/DnSmtp library.

Background Information (my blog)
http://securitythroughabsurdity.com/2008/02/dndns-net-dns-client-library-resolver.html.

On Pocket DnDns (my blog)
http://securitythroughabsurdity.com/2008/12/pocket-dndns-release-1.html.

DnDns Supported Record Types

AAAA
AFSDB
A
ATMA
CNAME
HINFO
ISDN
LOC
MB
MG
MINFO
MR
MX
NS
PTR
RP
RT
SOA
SRV
TXT
WKS
X25

Acknowledgments
N. Young - Provided initial code for TCP support.
A. Westerhold - linux/unix DNS server detection

and others for reporting bug fixes. Thanks!

dndns_pad_file.xml

Updated Wiki: Documentation

jmonty — Tue, 23 Feb 2010 15:45:59 GMT

Quick HOWTO Reference (Code Samples)

How to do a basic name lookup - A Record Lookup
How to do a reverse name lookup - PTR Record Lookup
How to lookup SPF Records - TXT Record Lookup
How to discover Mail server for a particular Domain - MX Record Lookup

For an extensive RFC reference for DNS: http://www.dns.net/dnsrd/rfc/

Updated Release: DnDns Library Release 2 (Feb 22, 2010)

jmonty — Mon, 22 Feb 2010 21:15:15 GMT

A DNS protocol library written completely in managed code (C#). Supports common DNS records types like A, CNAME, MX, SRV, and more. Works on Windows .NET 2.0, Mono 2.0, and .NET CF 2.0 for Pocket PC / Windows Mobile. Supports DNS resolution using both UDP and TCP protocols.

This release of DnDns (v1.0.1.0) contains numerous bug fixes as well as adding TCP support and DNS Server detection on Linux/Unix.

Released: DnDns Library Release 2 (Feb 22, 2010)

Mon, 22 Feb 2010 21:15:15 GMT

Closed Feature: Add Support for DNS Queries using the TCP protocol [1041]

jmonty — Mon, 22 Feb 2010 20:19:51 GMT

Infrastructure in code has the beginnings of TCP support, but it currently throws a NotImplementedException(). Finish adding TCP support.
Comments:

TCP Support Added

Updated Wiki: Home

jmonty — Mon, 22 Feb 2010 19:40:58 GMT

Project Description
A DNS protocol library written completely in managed code (C#). Supports common DNS records types like A, CNAME, MX, SRV, and more. Works on Windows .NET 2.0, Mono 2.0, and .NET CF 2.0 for Pocket PC / Windows Mobile. Supports DNS resoluiton using both UDP and TCP protocols.

Download the latest changeset here:
http://dndns.codeplex.com/SourceControl/list/changesets#

This library is also used by the DnSmtp http://www.codeplex.com/DnSmtp library.

Background Information (my blog)
http://securitythroughabsurdity.com/2008/02/dndns-net-dns-client-library-resolver.html.

On Pocket DnDns (my blog)
http://securitythroughabsurdity.com/2008/12/pocket-dndns-release-1.html.

Quick HOWTO Reference (Code Samples)

How to do a basic name lookup - A Record Lookup
How to do a reverse name lookup - PTR Record Lookup
How to lookup SPF Records - TXT Record Lookup
How to discover Mail server for a particular Domain - MX Record Lookup

For an extensive RFC reference for DNS: http://www.dns.net/dnsrd/rfc/

DnDns Supported Record Types

AAAA
AFSDB
A
ATMA
CNAME
HINFO
ISDN
LOC
MB
MG
MINFO
MR
MX
NS
PTR
RP
RT
SOA
SRV
TXT
WKS
X25

Acknowledgments
N. Young - Provided initial code for TCP support.
A. Westerhold - linux/unix DNS server detection

and others for reporting bug fixes. Thanks!

dndns_pad_file.xml

Source code checked in, #43351

jmonty — Mon, 22 Feb 2010 19:35:20 GMT

Added DNS discovery from resolv.conf file for mono/linux. Thanks A. Westerhold.

Source code checked in, #43297

jmonty — Sun, 21 Feb 2010 03:42:28 GMT

Added support for TCP, updated copyright information and version info.

Source code checked in, #43296

jmonty — Sun, 21 Feb 2010 03:08:32 GMT

Updated copyright notices.

Project License Changed

Sun, 21 Feb 2010 02:58:51 GMT

Copyright (c) 2010, j. montgomery All rights reserved. Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met: * Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer. * Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution. * Neither the name of j. montgomery's employer nor the names of its contributors may be used to endorse or promote products derived from this software without specific prior written permission. THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

Source code checked in, #43294

jmonty — Sun, 21 Feb 2010 02:57:29 GMT