How to use DNS resolution in Go?

With the continuous development of Internet technology, DNS resolution has increasingly become an element that cannot be ignored in program development. How to use DNS resolution in Go programming? This article will explore this knowledge.

What is DNS resolution?

DNS resolution refers to domain name system resolution and is the basis for data transmission on the Internet. Each website will have a domain name, such as www.google.com. This domain name can entrust the IP address of the website to the DNS server for management. When the user enters the website domain name in the browser, the DNS server will resolve the domain name into an IP address so that the browser can find the website and establish a connection.

Using DNS resolution in Go

In Go programming, we can use the ResolveIPAddr function or LookupIP function in the net package to perform DNS resolution.

ResolveIPAddr function

The ResolveIPAddr function takes the network type and IP address string as parameters and returns an IP address structure pointer and error information. This function will perform a DNS resolution and convert the domain name into an IP address.

Code example:

package main

import (
    "fmt"
    "net"
)

func main() {
    ipAddr, err := net.ResolveIPAddr("ip", "www.google.com")
    if err != nil {
        fmt.Println("Resolve error:", err)
        return
    }

    fmt.Println(ipAddr.String())
}

Running result:

172.217.160.164

LookupIP function

The LookupIP function takes the domain name as a parameter and returns an IP address slice and error message. This function will perform a DNS resolution and convert the domain name into an IP address.

Code example:

package main

import (
    "fmt"
    "net"
)

func main() {
    ips, err := net.LookupIP("www.google.com")
    if err != nil {
        fmt.Println("Lookup error:", err)
        return
    }

    for _, ip := range ips {
        fmt.Println(ip.String())
    }
}

Running results:

172.217.160.164

Summary

Through this article, we learned how to use DNS resolution in Go. In the actual programming process, we can select the appropriate function as needed, perform DNS resolution, and use the obtained IP address for related network connection operations.

The above is the detailed content of How to use DNS resolution in Go?. For more information, please follow other related articles on the PHP Chinese website!