golang set network card

Golang is a high-performance programming language that has become popular in recent years. It has the characteristics of platform independence, open source code and powerful concurrent programming capabilities. It is widely used in network programming, distributed systems, operation and maintenance automation and other fields. .

In network programming, it is often necessary to set up a network card to implement network communication functions. This article will introduce how to use Golang to set up a network card to implement the writing of TCP/IP protocol stack.

1. Obtain the network card list

In Golang, use the interface function in the net package to obtain the network card list. The specific code is as follows:

package main

import (
    "fmt"
    "net"
)

func main() {
    ifaces, err := net.Interfaces()
    if err != nil {
        fmt.Println("获取网卡列表失败：", err)
        return
    }
    for _, iface := range ifaces {
        fmt.Println(iface.Name, iface.HardwareAddr)
    }
}

By calling the net.Interfaces() function, you can obtain all network card interface information, and obtain the name, MAC address and other attributes of each network card through loop traversal. The result output by the program is as follows:

en0 0a:00:27:00:00:00
en1 0a:00:27:00:00:01
lo0 00:00:00:00:00:00
bridge0 02:5b:a5:b5:73:01

Among them, en0 and en1 represent the Ethernet network card, lo0 represents the local loopback interface (127.0.0.1), and bridge0 represents the bridge network card.

2. Set the network card IP address

In Golang, you can use the net.Interface.Addrs() function to obtain all IP address information by calling net.ParseIP() function to parse the IP address in string form, and call the iface.Addrs() function to obtain all the IP addresses of the network card, and then traverse and set them.

The following is a sample code for setting the network card IP address:

package main 

import (
    "fmt"
    "net"
)

func main() {
    iface, err := net.InterfaceByName("en0")
    if err != nil {
        fmt.Println("获取网卡接口失败：", err)
        return
    }
    addrs, _ := iface.Addrs()
    for _, addr := range addrs {
        if ipnet, ok := addr.(*net.IPNet); ok && !ipnet.IP.IsLoopback() {
            if ipnet.IP.To4() != nil {
                err := iface.Addrs().(*net.IPNet).IP.To4()[0], iface.Addrs().(*net.IPNet).IP.To4()[1], iface.Addrs().(*net.IPNet).IP.To4()[2], 200).To4())
                if err != nil {
                    fmt.Println("设置IP地址失败：", err)
                    return
                }
                fmt.Println("设置IP地址成功：", ipnet.IP.String())
            }
        }
    }
}

This sample code uses the net.InterfaceByName() function to obtain the network card interface information of the specified name, and then uses iface.Addrs()The function obtains all IP address information and traverses and sets it. Among them, the IP address represented by a string is parsed into a value of IP address type by using the net.ParseIP() function, then a value array of IP address type is generated, and finally iface is used. Addrs().(*net.IPNet).IP.To4()[0], iface.Addrs().(*net.IPNet).IP.To4()[1], iface.Addrs().(* net.IPNet).IP.To4()[2], 200).To4())The function sets the IP address to the specified IP address.

3. Enable the network card

In Golang, you can use the ifconfig command to enable the network card. The specific code is as follows:

package main 

import (
    "fmt"
    "os/exec"
)

func main() {
    cmd := exec.Command("/sbin/ifconfig", "en0", "up")
    err := cmd.Run()
    if err != nil {
        fmt.Println("启用网卡失败：", err)
        return
    }
    fmt.Println("启用网卡成功")
}

This sample code uses the Command() function in the os/exec package to create an object that executes the shell command, and then calls the The Run() function of the object is used to enable the network card with the specified name. If the activation is successful, the words "Network card enabled successfully" will be printed. If the enablement fails, an error message is printed.

4. Summary

This article introduces how to use Golang to write network programming code to realize the function of setting the network card so as to realize the communication function of TCP/IP protocol. By using the interface function in the net package to obtain the network card list and using the ifconfig function to enable the network card, you can achieve effective operations on the network interface. In actual development, operations need to be carried out according to specific needs to meet the requirements of the application.

The above is the detailed content of golang set network card. For more information, please follow other related articles on the PHP Chinese website!