node dns下载 - node dns源代码下载

node dns

其他类别

1.0.0

下载

Node.js DNS 协议实现

该项目是用于教育目的的 Node.js 和 Typescript 中 DNS 协议的实现。如果您有兴趣了解 DNS 的工作原理，或者想知道如何在 Node.js 中实现 DNS 解析器、名称服务器，甚至网络协议，那么这是适合您学习的项目。

从 Google 的公共 DNS 查找`www.instagram.com`

此示例演示如何为www.instagram.com创建 DNS 查询并将其发送到 Google 的公共 DNS 服务器。

async function lookup ( query : Buffer ) : Promise < Buffer > {
  return new Promise ( ( resolve , reject ) => {
    const client = dgram . createSocket ( 'udp4' ) ;

    client . on ( 'error' , reject ) ;

    client . on ( 'message' , ( message ) => {
      client . close ( ) ;
      return resolve ( message ) ;
    } ) ;

    client . on ( 'listening' , ( ) => {
      const address = client . address ( ) ;

      console . log ( `Listening on ${ address . address } : ${ address . port } ` ) ;

      client . send ( query , 53 , '8.8.8.8' , ( err , bytes ) => {
        if ( err ) {
          return reject ( err ) ;
        }

        console . log ( `Sent ${ bytes } bytes to 8.8.8.8:53` ) ;
      } ) ;
    } ) ;

    client . bind ( ) ;
  } ) ;
}

async function main ( ) {
  const builder = new DNSMessageBuilder ( ) ;
  const message = builder
    . withHeader (
      new DNSMessageHeader ( {
        id : 0x01 ,
        isQuery : true ,
        recursionDesired : true ,
      } )
    )
    . withQuestions ( [
      new QuestionEntry ( {
        qname : 'www.instagram.com' ,
        qclass : QCLASS . IN ,
        qtype : QTYPE . AAAA ,
      } ) ,
    ] )
    . build ( ) ;

  const encoder = new DNSEncoder ( message ) ;
  const buffer = encoder . encode ( ) ;
  const responseBuffer = await lookup ( buffer ) ;

  const decoder = new DNSDecoder ( responseBuffer ) ;

  const responseMessage = decoder . decode ( ) ;
  console . log ( 'Response:' , responseMessage ) ;
}

main ( ) ;