54 lines
1.0 KiB
Go
54 lines
1.0 KiB
Go
package utils
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import (
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"net"
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"github.com/go-errors/errors"
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)
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func getLocalIP() (net.IP, error) {
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conn, err := net.Dial("udp", "1.0.0.1:53")
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if err != nil {
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return nil, err
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}
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defer conn.Close()
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host, _, err := net.SplitHostPort(conn.LocalAddr().String())
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if err != nil {
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return nil, errors.Wrap(err, 0)
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}
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ip := net.ParseIP(host)
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if ip == nil {
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return nil, errors.Errorf("failed to parse IP address %q", host)
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}
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return ip, nil
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}
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func FindDefaultAdapter() (*net.Interface, error) {
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localIP, err := getLocalIP()
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if err != nil {
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return nil, errors.WrapPrefix(err, "failed to get local address", 0)
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}
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iflist, err := net.Interfaces()
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if err != nil {
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return nil, errors.WrapPrefix(err, "failed to get interface list", 0)
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}
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for _, iface := range iflist {
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addrs, err := iface.Addrs()
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if err != nil {
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continue
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}
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for _, addr := range addrs {
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ipnet, ok := addr.(*net.IPNet)
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if !ok {
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continue
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}
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if localIP.Equal(ipnet.IP) {
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return &iface, nil
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}
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}
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}
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return nil, errors.New("failed to find default adapter")
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}
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