| /* |
| Licensed to the Apache Software Foundation (ASF) under one or more |
| contributor license agreements. See the NOTICE file distributed with |
| this work for additional information regarding copyright ownership. |
| The ASF licenses this file to You under the Apache License, Version 2.0 |
| (the "License"); you may not use this file except in compliance with |
| the License. You may obtain a copy of the License at |
| |
| http://www.apache.org/licenses/LICENSE-2.0 |
| |
| Unless required by applicable law or agreed to in writing, software |
| distributed under the License is distributed on an "AS IS" BASIS, |
| WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| See the License for the specific language governing permissions and |
| limitations under the License. |
| */ |
| |
| package utils |
| |
| import ( |
| "bytes" |
| "errors" |
| "fmt" |
| "net" |
| "strconv" |
| "time" |
| ) |
| |
| var ( |
| LocalIP string |
| ) |
| |
| func init() { |
| ip, err := ClientIP4() |
| if err != nil { |
| LocalIP = "" |
| } else { |
| LocalIP = fmt.Sprintf("%d.%d.%d.%d", ip[0], ip[1], ip[2], ip[3]) |
| } |
| } |
| |
| func ClientIP4() ([]byte, error) { |
| addrs, err := net.InterfaceAddrs() |
| if err != nil { |
| return nil, errors.New("unexpected IP address") |
| } |
| for _, addr := range addrs { |
| if ipnet, ok := addr.(*net.IPNet); ok && !ipnet.IP.IsLoopback() { |
| if ip4 := ipnet.IP.To4(); ip4 != nil { |
| return ip4, nil |
| } |
| } |
| } |
| return nil, errors.New("unknown IP address") |
| } |
| |
| func FakeIP() []byte { |
| buf := bytes.NewBufferString("") |
| buf.WriteString(strconv.FormatInt(time.Now().UnixNano()/int64(time.Millisecond), 10)) |
| return buf.Bytes()[4:8] |
| } |
| |
| func GetAddressByBytes(data []byte) string { |
| return net.IPv4(data[0], data[1], data[2], data[3]).String() |
| } |