|
| 1 | +package netutil |
| 2 | + |
| 3 | +import ( |
| 4 | + "errors" |
| 5 | + "io/ioutil" |
| 6 | + "mime/multipart" |
| 7 | + "net" |
| 8 | + "net/http" |
| 9 | + "os" |
| 10 | + "strconv" |
| 11 | + "strings" |
| 12 | + |
| 13 | + gnet "github.com/shirou/gopsutil/net" |
| 14 | + "github.com/tomasen/realip" |
| 15 | +) |
| 16 | + |
| 17 | +// 获取文件大小的接口 |
| 18 | +type Size interface { |
| 19 | + Size() int64 |
| 20 | +} |
| 21 | + |
| 22 | +// 获取文件信息的接口 |
| 23 | +type Stat interface { |
| 24 | + Stat() (os.FileInfo, error) |
| 25 | +} |
| 26 | + |
| 27 | +// 返回公网出口IP |
| 28 | +func GetExternalIP() (string, error) { |
| 29 | + resp, err := http.Get("http://ipaddr.site") |
| 30 | + if err != nil { |
| 31 | + return "", err |
| 32 | + } |
| 33 | + |
| 34 | + defer resp.Body.Close() |
| 35 | + txt, err := ioutil.ReadAll(resp.Body) |
| 36 | + if err != nil { |
| 37 | + return "", err |
| 38 | + } |
| 39 | + return string(txt), nil |
| 40 | +} |
| 41 | + |
| 42 | +func Inet_ntoa(ipnr int64) net.IP { |
| 43 | + var bytes [4]byte |
| 44 | + bytes[0] = byte(ipnr & 0xFF) |
| 45 | + bytes[1] = byte((ipnr >> 8) & 0xFF) |
| 46 | + bytes[2] = byte((ipnr >> 16) & 0xFF) |
| 47 | + bytes[3] = byte((ipnr >> 24) & 0xFF) |
| 48 | + |
| 49 | + return net.IPv4(bytes[3], bytes[2], bytes[1], bytes[0]) |
| 50 | +} |
| 51 | + |
| 52 | +func Inet_aton(ipnr net.IP) int64 { |
| 53 | + bits := strings.Split(ipnr.String(), ".") |
| 54 | + |
| 55 | + b0, _ := strconv.Atoi(bits[0]) |
| 56 | + b1, _ := strconv.Atoi(bits[1]) |
| 57 | + b2, _ := strconv.Atoi(bits[2]) |
| 58 | + b3, _ := strconv.Atoi(bits[3]) |
| 59 | + |
| 60 | + var sum int64 |
| 61 | + |
| 62 | + sum += int64(b0) << 24 |
| 63 | + sum += int64(b1) << 16 |
| 64 | + sum += int64(b2) << 8 |
| 65 | + sum += int64(b3) |
| 66 | + |
| 67 | + return sum |
| 68 | +} |
| 69 | + |
| 70 | +func IsPublicIP(IP net.IP) bool { |
| 71 | + if IP.IsLoopback() || IP.IsLinkLocalMulticast() || IP.IsLinkLocalUnicast() { |
| 72 | + return false |
| 73 | + } |
| 74 | + if ip4 := IP.To4(); ip4 != nil { |
| 75 | + switch true { |
| 76 | + case ip4[0] == 10: |
| 77 | + return false |
| 78 | + case ip4[0] == 172 && ip4[1] >= 16 && ip4[1] <= 31: |
| 79 | + return false |
| 80 | + case ip4[0] == 192 && ip4[1] == 168: |
| 81 | + return false |
| 82 | + default: |
| 83 | + return true |
| 84 | + } |
| 85 | + } |
| 86 | + return false |
| 87 | +} |
| 88 | + |
| 89 | +// 返回主机HOST IP |
| 90 | +func GetHostIP() (string, error) { |
| 91 | + host, err := os.Hostname() |
| 92 | + if err != nil { |
| 93 | + return "", err |
| 94 | + } |
| 95 | + addr, err := net.ResolveIPAddr("ip", host) |
| 96 | + if err != nil { |
| 97 | + return "", err |
| 98 | + } |
| 99 | + |
| 100 | + return addr.String(), nil |
| 101 | +} |
| 102 | + |
| 103 | +// 返回主机内部IP（顺序第一个） |
| 104 | +func GetInternalIP() (string, error) { |
| 105 | + addrs, err := net.InterfaceAddrs() |
| 106 | + if err != nil { |
| 107 | + return "", err |
| 108 | + } |
| 109 | + for _, a := range addrs { |
| 110 | + if ipnet, ok := a.(*net.IPNet); ok && !ipnet.IP.IsLoopback() { |
| 111 | + ipv4str := ipnet.IP.To4() |
| 112 | + if ipv4str != nil { |
| 113 | + return ipv4str.String(), nil |
| 114 | + } |
| 115 | + } |
| 116 | + } |
| 117 | + return "", nil |
| 118 | +} |
| 119 | + |
| 120 | +// 返回HTTP请求IP,优先级(X-Real-IP>X-Forwarded-For>Proxy-Client-IP>WL-Proxy-Client-IP") |
| 121 | +func GetRequestIP(r *http.Request) string { |
| 122 | + if r.Header.Get("X-Real-IP") != "" { |
| 123 | + return r.Header.Get("X-Real-IP") |
| 124 | + } |
| 125 | + if r.Header.Get("X-Forwarded-For") != "" { |
| 126 | + return r.Header.Get("X-Forwarded-For") |
| 127 | + } |
| 128 | + if r.Header.Get("Proxy-Client-IP") != "" { |
| 129 | + return r.Header.Get("Proxy-Client-IP") |
| 130 | + } |
| 131 | + if r.Header.Get("WL-Proxy-Client-IP") != "" { |
| 132 | + return r.Header.Get("WL-Proxy-Client-IP") |
| 133 | + } |
| 134 | + return realip.FromRequest(r) |
| 135 | +} |
| 136 | + |
| 137 | +// 根据网卡设备名称返回内部IP |
| 138 | +func GetInternalIPByDevName(dev string) ([]string, error) { |
| 139 | + addrs, err := gnet.Interfaces() |
| 140 | + if err != nil { |
| 141 | + return []string{}, err |
| 142 | + } |
| 143 | + for _, a := range addrs { |
| 144 | + if a.Name == dev { |
| 145 | + var retIPs []string |
| 146 | + for _, addr := range a.Addrs { |
| 147 | + retIPs = append(retIPs, addr.String()) |
| 148 | + } |
| 149 | + return retIPs, nil |
| 150 | + } |
| 151 | + } |
| 152 | + return []string{}, errors.New("not found dev or ip addr") |
| 153 | +} |
| 154 | + |
| 155 | +// 返回HTTP upload文件的大小 |
| 156 | +func GetUploadFileSize(upfile multipart.File) (int64, error) { |
| 157 | + if statInterface, ok := upfile.(Stat); ok { |
| 158 | + fileInfo, _ := statInterface.Stat() |
| 159 | + return fileInfo.Size(), nil |
| 160 | + } |
| 161 | + if sizeInterface, ok := upfile.(Size); ok { |
| 162 | + fsize := sizeInterface.Size() |
| 163 | + return fsize, nil |
| 164 | + } |
| 165 | + return 0, errors.New("not found stat and size interface") |
| 166 | +} |
| 167 | + |
| 168 | +// 在主机拥有多个IP地址时，返回能够连通对端网络的自身主机IP |
| 169 | +func GetLocalConnectIP(proto string, addr string) (string, error) { |
| 170 | + if proto == "" { |
| 171 | + proto = "tcp" |
| 172 | + } |
| 173 | + conn, err := net.Dial(proto, addr) |
| 174 | + if err != nil { |
| 175 | + return "", nil |
| 176 | + } |
| 177 | + defer conn.Close() |
| 178 | + laddr := conn.LocalAddr().String() |
| 179 | + var rip string |
| 180 | + v := strings.Split(laddr, ":") |
| 181 | + if len(v) > 1 { |
| 182 | + rip = v[0] |
| 183 | + } |
| 184 | + return rip, nil |
| 185 | +} |
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