47 lines
1 KiB
Go
47 lines
1 KiB
Go
package agent
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import (
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"fmt"
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"net"
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)
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// IpOfDevice returns a routable ip addr of a device
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func ipOfDevice(name string) (net.IP, error) {
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intf, err := net.InterfaceByName(name)
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if err != nil {
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return nil, err
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}
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addrs, err := intf.Addrs()
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if err != nil {
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return nil, err
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}
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if len(addrs) == 0 {
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return nil, fmt.Errorf("no ips were detected on the interface: %v", name)
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}
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// Iterating through the IPs configured for that device and returning the
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// the first ipv4 address configured. If no ipv4 addresses are configured,
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// we return the first ipv6 addr if any ipv6 addr is configured.
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var ipv6Addrs []net.IP
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for _, addr := range addrs {
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var ip net.IP
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switch v := (addr).(type) {
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case *net.IPNet:
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ip = v.IP
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if ip.To4() != nil {
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return ip, nil
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}
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if ip.To16() != nil {
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ipv6Addrs = append(ipv6Addrs, ip)
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continue
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}
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case *net.IPAddr:
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continue
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}
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}
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if len(ipv6Addrs) > 0 {
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return ipv6Addrs[0], nil
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}
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return nil, fmt.Errorf("no ips were detected on the interface: %v", name)
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}
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