linux golang 实现创建tun ，启动tun，删除tun

A：

创建tun：

package main

import (
    "fmt"
    "os"
    "unsafe"
    "syscall"
)

const (
    TUNSETIFF = 0x400454ca // set tunnel type
    IFF_TUN   = 0x0001     // virtual tunnel
    IFF_NO_PI = 0x1000     // no packet information
)

func main() {
    fd, err := syscall.Open("/dev/net/tun", os.O_RDWR, 0)
    if err != nil {
        panic(err)
    }
    ifr := &syscall.Ifreq{
        Name: [syscall.IFNAMSIZ]byte{'t', 'u', 'n', '0'},
    }
    ifr.Flags = IFF_TUN | IFF_NO_PI
    _, _, err = syscall.Syscall(syscall.SYS_IOCTL, uintptr(fd), uintptr(TUNSETIFF), uintptr(unsafe.Pointer(ifr)))
    if err != 0 {
        panic(err)
    }
    fmt.Printf("TUN device %s created\n", ifr.Name[:])
}

启动tun：

package main

import (
    "fmt"
    "os"
    "os/exec"
)

const (
    TUN_NAME = "tun0"
    IP_ADDR  = "10.0.0.1"
    NETMASK  = "255.255.255.0"
)

func main() {
    cmd := exec.Command("ip", "link", "set", "dev", TUN_NAME, "up")
    if err := cmd.Run(); err != nil {
        fmt.Fprintf(os.Stderr, "Error starting TUN device: %v", err)
        os.Exit(1)
    }
    cmd = exec.Command("ip", "addr", "add", IP_ADDR+"/"+NETMASK, "dev", TUN_NAME)
    if err := cmd.Run(); err != nil {
        fmt.Fprintf(os.Stderr, "Error configuring TUN device: %v", err)
        os.Exit(1)
    }
    fmt.Println("TUN device started")
}

删除tun：

package main

import (
    "fmt"
    "os"
    "os/exec"
)

const (
    TUN_NAME = "tun0"
)

func main() {
    cmd := exec.Command("ip", "link", "del", TUN_NAME)
    if err := cmd.Run(); err != nil {
        fmt.Fprintf(os.Stderr, "Error deleting TUN device: %v", err)
        os.Exit(1)
    }
    fmt.Println("TUN device deleted")
}