Dns

An asynchronous DNS resolver component written by C#.

Part of the code from DNS.NET Resolver,this project wrap it to support .net async feature.

nuget install Yamool.Net.DNS

Features

• TCP or UDP protocol to query
• Supports all of DNS record types

Usage

var DefaultDnsServer = new EndPoint[] { new IPEndPoint(IPAddress.Parse("8.8.8.8"), 53) };
var host = "www.google.com";
var resolver = new Resolver(DefaultDnsServer)
{
	Timeout = 1000,
	Retries = 3,
	TransportType = TransportType.Tcp
};
var response = await resolver.QueryAsync(host, QTYPE.A);

;; Got answer:
;; ->>Header<<- opcode: Query, status: NoError, id: 30693
;; flags:  qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 0

;; QUESTION SECTION:
;www.google.com.                 	IN	A

;; ANSWER SECTION:
www.google.com.                  28	IN	A	216.58.221.100

;; Query time: 101 msec
;; SERVER: 8.8.8.8#53(8.8.8.8)
;; WHEN: Mon Jul 13 23:12:30 2015

MX

var host = "163.com";
var resolver = new Resolver(DefaultDnsServer)
{
	Timeout = 1000,                
	TransportType = TransportType.Udp
};
var response = await resolver.QueryAsync(host, QTYPE.MX).ConfigureAwait(false);

;; Got answer:
;; ->>Header<<- opcode: Query, status: NoError, id: 29780
;; flags:  qr rd ra; QUERY: 1, ANSWER: 4, AUTHORITY: 0, ADDITIONAL: 0

;; QUESTION SECTION:
;163.com.                        	IN	MX

;; ANSWER SECTION:
163.com.                         13377	IN	MX	10 163mx02.mxmail.netease.com.
163.com.                         13377	IN	MX	50 163mx00.mxmail.netease.com.
163.com.                         13377	IN	MX	10 163mx03.mxmail.netease.com.
163.com.                         13377	IN	MX	10 163mx01.mxmail.netease.com.

;; Query time: 88 msec
;; SERVER: 8.8.8.8#53(8.8.8.8)
;; WHEN: Mon Jul 13 23:29:53 2015