Go language practice: Sharing how to quickly modify IP address

Go language practice: sharing of methods to quickly modify IP addresses

In network programming, the operation of modifying IP addresses is often involved, whether it is used for network tools The development is also used for scripting of automated tasks. Using Go language to operate IP addresses is very simple and efficient. This article will share how to use Go language to quickly modify the IP address and provide specific code examples.

1. Obtain the local IP address

In the Go language, you can easily obtain the IP address of the local host through the functions in the net package. The following code example demonstrates how to obtain the IP address of the local host:

package main

import (
    "fmt"
    "net"
)

func main() {
    addrs, err := net.InterfaceAddrs()
    if err != nil {
        fmt.Println("获取本地IP地址失败：", err)
        return
    }

    for _, addr := range addrs {
        if ipnet, ok := addr.(*net.IPNet); ok && !ipnet.IP.IsLoopback() {
            if ipnet.IP.To4() != nil {
                fmt.Println("本地IP地址：", ipnet.IP.String())
            }
        }
    }
}

The above code obtains the IP address of the local host by traversing the network card interface and outputs it to the console.

2. Modify the IP address

In the Go language, to modify the IP address, you can use the functions and structures in the net package. The following code example demonstrates how to modify the IP address to the specified target address:

package main

import (
    "fmt"
    "net"
)

func main() {
    // 目标IP地址
    newIP := net.ParseIP("192.168.1.100")
    if newIP == nil {
        fmt.Println("无法解析目标IP地址")
        return
    }

    ifaces, err := net.Interfaces()
    if err != nil {
        fmt.Println("获取网卡接口失败：", err)
        return
    }

    for _, iface := range ifaces {
        addrs, err := iface.Addrs()
        if err != nil {
            fmt.Println("获取网卡地址失败：", err)
            continue
        }

        for _, addr := range addrs {
            ipnet, ok := addr.(*net.IPNet)
            if !ok {
                continue
            }

            if ipnet.IP.To4() != nil {
                ip := ipnet.IP.To4()
                err := setIPAddr(&iface, ip, newIP)
                if err != nil {
                    fmt.Println("修改IP地址失败：", err)
                } else {
                    fmt.Println("修改IP地址成功")
                }
            }
        }
    }
}

func setIPAddr(iface *net.Interface, oldIP, newIP net.IP) error {
    addrs, err := net.InterfaceAddrs()
    if err != nil {
        return err
    }

    for _, addr := range addrs {
        ipnet, ok := addr.(*net.IPNet)
        if !ok {
            continue
        }

        if ipnet.IP.Equal(oldIP) {
            err := netlink.AddrDel(iface, &netlink.Addr{IPNet: &net.IPNet{IP: oldIP, Mask: ipnet.Mask}})
            if err != nil {
                return err
            }

            err = netlink.AddrAdd(iface, &netlink.Addr{IPNet: &net.IPNet{IP: newIP, Mask: ipnet.Mask}})
            if err != nil {
                return err
            }
            return nil
        }
    }
    return fmt.Errorf("未找到匹配的IP地址")
}

The above code first parses the target IP address, then traverses all network card interfaces, finds the network card containing the original IP address, and replaces it with the new IP address.

Through the above code example, you can quickly modify the IP address. Of course, in practical applications, aspects such as security and error handling also need to be considered to ensure the stability and reliability of the code.

Summary: This article introduces how to quickly modify the IP address in the Go language and provides specific code examples. I hope that readers can become more proficient in using Go language to perform IP address operations in network programming through the sharing of this article.

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