A brief analysis of how to set up a network card in Go language

Go is a cross-platform programming language with a powerful network programming library that can meet various network programming needs. In practical applications, we often need to control the network interface, such as setting the network card IP address, MAC address, etc. This article will introduce how to set up the network card using Go language.

1. Get the network card list

In Go language, you can get all the network card information in the system through the net.Interface structure. Below is a simple sample code that prints out the names and MAC addresses of all network cards in the system.

package main

import (
    "fmt"
    "net"
)

func main() {
    interfaces, err := net.Interfaces()
    if err != nil {
        panic(err)
    }

    for _, itf := range interfaces {
        fmt.Printf("Name: %s\n", itf.Name)
        fmt.Printf("MAC address: %s\n", itf.HardwareAddr)
    }
}

2. Set the network card IP address

To set the network card IP address you need to use InterfaceAddrs() and # in the net library ##ParseCIDR()Method. Below is a simple example code to set the IP address of network card en0 to 192.168.1.100/24.

package main

import (
    "fmt"
    "net"
)

func main() {
    iface, err := net.InterfaceByName("en0")
    if err != nil {
        panic(err)
    }

    addr, err := net.ParseCIDR("192.168.1.100/24")
    if err != nil {
        panic(err)
    }

    err = iface.Addrs()
    if err != nil {
        panic(err)
    }

    err = netlink.AddrAdd(iface, addr)
    if err != nil {
        panic(err)
    }

    fmt.Println("IP address set successfully")
}

Set the network card MAC address

To set the network card MAC address, you need to use the

SetHardwareAddr() method in the netlink library. Below is a simple example code to set the MAC address of network card en0 to 00:11:22:33:44:55.

package main

import (
    "fmt"
    "net"
    "github.com/vishvananda/netlink"
)

func main() {
    iface, err := net.InterfaceByName("en0")
    if err != nil {
        panic(err)
    }

    link, err := netlink.LinkByName(iface.Name)
    if err != nil {
        panic(err)
    }

    macAddr, err := net.ParseMAC("00:11:22:33:44:55")
    if err != nil {
        panic(err)
    }

    err = netlink.LinkSetHardwareAddr(link, macAddr)
    if err != nil {
        panic(err)
    }

    fmt.Println("MAC address set successfully")
}

Conclusion

Through the above example code, we can see that it is very simple to set the network card IP address and MAC address in the Go language. This fully illustrates the powerful network programming capabilities of the Go language and helps developers control and manage network interfaces more conveniently.

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