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pkg/common/outbound_ip.go
75 строк
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Jason Song
feat: improve GetOutboundIP (#1707)
31 мар 2023, 16:28
Не верифицирован
31 мар 2023, 16:28
8518d70
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package common import ( "net" "sort" "strings" ) // GetOutboundIP returns an outbound IP address of this machine. // It tries to access the internet and returns the local IP address of the connection. // If the machine cannot access the internet, it returns a preferred IP address from network interfaces. // It returns nil if no IP address is found. func GetOutboundIP() net.IP { // See https://stackoverflow.com/a/37382208 conn, err := net.Dial("udp", "8.8.8.8:80") if err == nil { defer conn.Close() return conn.LocalAddr().(*net.UDPAddr).IP } // So the machine cannot access the internet. Pick an IP address from network interfaces. if ifs, err := net.Interfaces(); err == nil { type IP struct { net.IP net.Interface } var ips []IP for _, i := range ifs { if addrs, err := i.Addrs(); err == nil { for _, addr := range addrs { var ip net.IP switch v := addr.(type) { case *net.IPNet: ip = v.IP case *net.IPAddr: ip = v.IP } if ip.IsGlobalUnicast() { ips = append(ips, IP{ip, i}) } } } } if len(ips) > 1 { sort.Slice(ips, func(i, j int) bool { ifi := ips[i].Interface ifj := ips[j].Interface // ethernet is preferred if vi, vj := strings.HasPrefix(ifi.Name, "e"), strings.HasPrefix(ifj.Name, "e"); vi != vj { return vi } ipi := ips[i].IP ipj := ips[j].IP // IPv4 is preferred if vi, vj := ipi.To4() != nil, ipj.To4() != nil; vi != vj { return vi } // en0 is preferred to en1 if ifi.Name != ifj.Name { return ifi.Name < ifj.Name } // fallback return ipi.String() < ipj.String() }) return ips[0].IP } } return nil }