golang modify ip

Go language is a very powerful programming language suitable for developing various types of applications. It not only has high performance and concurrency capabilities, but also has easy-to-learn syntax and clear coding style, so it is very popular among developers. In actual application development, we often need to modify the IP address, and the Go language also provides a corresponding interface to implement this function. This article will introduce in detail how to use the Go language to modify the IP address.

The methods of modifying the IP address in the Go language include modifying the network card IP address and modifying the system IP address. Below we will introduce these two methods respectively.

1. Modify the network card IP address

To modify the network card IP address, we need to use the interface in the net package.

package main

import (
    "fmt"
    "net"
)

func main() {
    ifaces, err := net.Interfaces()
    if err != nil {
        fmt.Println(err)
        return
    }

    for _, iface := range ifaces {
        fmt.Println(iface.Name)
        addrs, err := iface.Addrs()
        if err != nil {
            fmt.Println(err)
            continue
        }
        for _, addr := range addrs {
            ip, _, err := net.ParseCIDR(addr.String())
            if err != nil {
                fmt.Println(err)
                continue
            }
            fmt.Println(ip)
        }
    }
}

The above code obtains all network interfaces of the local machine by calling the net.Interfaces() method, traverses each network interface, and then calls the iface.Addrs() method to obtain all IP addresses of the network interface. Next, we can modify the IP address of the network card.

package main

import (
    "fmt"
    "net"
)

func main() {
    ifaces, err := net.Interfaces()
    if err != nil {
        fmt.Println(err)
        return
    }

    for _, iface := range ifaces {
        if iface.Name == "eth0" { // 确定要修改的接口名称
            addrs, err := iface.Addrs()
            if err != nil {
                fmt.Println(err)
                continue
            }
            for _, addr := range addrs {
                ip, _, err := net.ParseCIDR(addr.String())
                if err != nil {
                    fmt.Println(err)
                    continue
                }
                if ipv4 := ip.To4(); ipv4 != nil {
                    ipv4[3] = 128 // 修改IP地址的最后一位
                    fmt.Println(ipv4)
                }
            }
        }
    }
}

The above code can change the last digit of the IP address of the eth0 network card to 128. After the modification is completed, the modified IP address needs to be returned to the system for it to take effect.

package main

import (
    "fmt"
    "net"
)

func main() {
    ifaces, err := net.Interfaces()
    if err != nil {
        fmt.Println(err)
        return
    }

    for _, iface := range ifaces {
        if iface.Name == "eth0" { // 确定要修改的接口名称
            addrs, err := iface.Addrs()
            if err != nil {
                fmt.Println(err)
                continue
            }
            for _, addr := range addrs {
                ip, _, err := net.ParseCIDR(addr.String())
                if err != nil {
                    fmt.Println(err)
                    continue
                }
                if ipv4 := ip.To4(); ipv4 != nil {
                    ipv4[3] = 128 // 修改IP地址的最后一位
                    fmt.Println(ipv4)
                    newIP := &net.IPNet{IP: ipv4, Mask: addr.(*net.IPNet).Mask}
                    err := netlink.RouteAdd(&netlink.Route{
                        Dst:       newIP,
                        LinkIndex: iface.Index,
                    })
                    if err != nil {
                        fmt.Println(err)
                        continue
                    }
                }
            }
        }
    }
}

The above code calls the netlink.RouteAdd() method, which can return the modified IP address to the operating system to take effect.

2. Modify the system IP address

If you need to modify the IP address of the operating system, we can do so by calling the relevant interface in the net package.

package main

import (
    "fmt"
    "net"
)

func main() {
    ip := net.ParseIP("192.168.1.100") // 新的IP地址
    mask := net.CIDRMask(24, 32)      // 新的子网掩码

    err := netlink.NetworkLinkAddIp("eth0", &netlink.Addr{IPNet: &net.IPNet{IP: ip, Mask: mask}})
    if err != nil {
        fmt.Println(err)
        return
    }
}

The above code calls the netlink.NetworkLinkAddIp() method, which uses the form of "network device name IP address subnet mask" to set the IP address. It can also modify the IP address of the operating system.

Summary

This article introduces how to use Go language to modify the IP address. It also introduces the methods of modifying the IP address of the network card and the IP address of the operating system respectively. Specifically, we can use the corresponding interface in the net package to implement this function, which is very simple and easy to understand. In the actual application process, we can choose the appropriate method to modify according to actual needs.

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