如何获得分配给机器的所有IP地址？

Question

Given the following code:

// iptest
package main

import (
    "fmt"
    "net"
    "os"
)

func main() {
    host, _ := os.Hostname()
    addrs, _ := net.LookupIP(host)
    for _, addr := range addrs {
        if ipv4 := addr.To4(); ipv4 != nil {
            fmt.Println("IPv4: ", ipv4)
        }   
    }
}

I'm having a problem where it only returns the first IP address assigned to the adapter. This appears to be a problem only on systems that have a DNS suffix defined. If one is not defined, it works fine and reports all IPs that have been assigned.

Answer 1

If you're trying to get the addresses currently assigned to the machine. I think you should consider using net.InterfaceAddrs() instead of trying to do a DNS lookup for the hostname. Here's a short example that will give you all the IPs on the local machine.

package main

import (
    "fmt"
    "net"
)

func main() {
    addrs, _ := net.InterfaceAddrs()
    fmt.Printf("%v
", addrs)
    for _, addr := range addrs {
        fmt.Println("IPv4: ", addr)
    }
}