Node.js dns.resolveSoa()方法

原文:https://www . geesforgeks . org/node-js-DNS-resolve so a-method/

dns.resolveSoa()方法是 dns 模块的内置应用程序编程接口，用于使用 dns 协议解析指定主机名的 Soa 或权限记录的开始。

语法:

dns.resolveSoa( hostname, callback )

参数:该方法有两个参数，如上所述，如下所述:

• Hostname: This parameter specifies a string that represents the hostname to be resolved.
• Callback: Specifies the function to be called after DNS resolution of the host name.
  • Error: The specified generation error.
  • Address: It is a string array that represents the authorization start (SOA) record of the returned host name.

返回值:此方法返回错误，通过回调函数寻址。这些数据作为参数传递给回调函数。地址参数将包含 nsname、hostmaster、serial、refresh、retry、expire 和 minttl 属性。

下面的例子说明了在 Node.js 中 dns.resolveSoa()方法的使用:

例 1:

// Node.js program to demonstrate the   
// dns.resolveSoa() method

// Accessing dns module
const dns = require('dns');

// Calling dns.resolveSoa() method for hostname
//  geeksforgeeks.org and displaying them in
// console as a callback
dns.resolveSoa('geeksforgeeks.org', (err, 
    addresses) => console.log('SOA records: %j', addresses));

输出:

SOA records: {
    "nsname":"ns-869.awsdns-44.net",
    "hostmaster":"awsdns-hostmaster.amazon.com",
    "serial":1,
    "refresh":7200,
    "retry":900,
    "expire":1209600,
    "minttl":86400
}

例 2:

// Node.js program to demonstrate the   
// dns.resolveSoa() method

// Accessing dns module
const dns = require('dns');

// Calling dns.resolveSoa() method for hostname
// google.com printing them in console as a callback
dns.resolveSoa('google.com', (err, 
    addresses) => console.log('SOA records: %j', addresses));

输出:

SOA records: {
    "nsname":"ns1.google.com",
    "hostmaster":"dns-admin.google.com",
    "serial":287530106,
    "refresh":900,
    "retry":900,
    "expire":1800,
    "minttl":60
}

注意:以上程序使用node index.js命令编译运行。

参考:https://nodejs . org/API/DNS . html # DNS _ DNS _ resolvesoa _ hostname _ callback

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