github.com/XiaoMi/Gaea@v1.2.5/util/ip.go (about)

     1  // Copyright 2016 The kingshard Authors. All rights reserved.
     2  //
     3  // Licensed under the Apache License, Version 2.0 (the "License"): you may
     4  // not use this file except in compliance with the License. You may obtain
     5  // a copy of the License at
     6  //
     7  //     http://www.apache.org/licenses/LICENSE-2.0
     8  //
     9  // Unless required by applicable law or agreed to in writing, software
    10  // distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
    11  // WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
    12  // License for the specific language governing permissions and limitations
    13  // under the License.
    14  
    15  package util
    16  
    17  import (
    18  	"errors"
    19  	"fmt"
    20  	"net"
    21  	"strings"
    22  )
    23  
    24  // IPInfo ip information
    25  type IPInfo struct {
    26  	info    string
    27  	isIPNet bool
    28  	ip      net.IP
    29  	ipNet   net.IPNet
    30  }
    31  
    32  // ParseIPInfo parse ip
    33  func ParseIPInfo(v string) (IPInfo, error) {
    34  	if ip, ipNet, err := net.ParseCIDR(v); err == nil {
    35  		return IPInfo{
    36  			info:    v,
    37  			isIPNet: true,
    38  			ip:      ip,
    39  			ipNet:   *ipNet,
    40  		}, nil
    41  	}
    42  
    43  	if ip := net.ParseIP(v); ip != nil {
    44  		return IPInfo{
    45  			info:    v,
    46  			isIPNet: false,
    47  			ip:      ip,
    48  		}, nil
    49  	}
    50  
    51  	return IPInfo{}, errors.New("invalid ip address")
    52  }
    53  
    54  // Info return information of ip
    55  func (t *IPInfo) Info() string {
    56  	return t.info
    57  }
    58  
    59  // Match check if ip matched
    60  func (t *IPInfo) Match(ip net.IP) bool {
    61  	if t.isIPNet {
    62  		return t.ipNet.Contains(ip)
    63  	}
    64  	return t.ip.Equal(ip)
    65  }
    66  
    67  func parseAllowIps(allowIpsStr string) ([]IPInfo, error) {
    68  	if len(allowIpsStr) == 0 {
    69  		return make([]IPInfo, 0, 10), nil
    70  	}
    71  	ipVec := strings.Split(allowIpsStr, ",")
    72  	allowIpsList := make([]IPInfo, 0, 10)
    73  	for _, ipStr := range ipVec {
    74  		if ip, err := ParseIPInfo(strings.TrimSpace(ipStr)); err == nil {
    75  			allowIpsList = append(allowIpsList, ip)
    76  		}
    77  	}
    78  	return allowIpsList, nil
    79  }
    80  
    81  func resolveAddr(network string, address string, replaceZeroAddr bool) (string, error) {
    82  	switch network {
    83  	default:
    84  		return "", fmt.Errorf("invalid network '%s'", network)
    85  
    86  	case "unix", "unixpacket":
    87  		return address, nil
    88  
    89  	case "tcp", "tcp4", "tcp6":
    90  		addr, err := net.ResolveTCPAddr(network, address)
    91  		if err != nil {
    92  			return "", err
    93  		}
    94  		if addr.Port != 0 {
    95  			//是否为空地址
    96  			if !isZeroIPAddr(addr) {
    97  				return addr.String(), nil
    98  			}
    99  			if replaceZeroAddr {
   100  				ifaddrs, err := net.InterfaceAddrs()
   101  				if err != nil {
   102  					return "", err
   103  				}
   104  				for _, ifaddr := range ifaddrs {
   105  					switch in := ifaddr.(type) {
   106  					case *net.IPNet:
   107  						if in.IP.IsGlobalUnicast() {
   108  							addr.IP = in.IP
   109  							return addr.String(), nil
   110  						}
   111  					}
   112  				}
   113  			}
   114  		}
   115  		return "", fmt.Errorf("invalid address '%s'", addr.String())
   116  	}
   117  }
   118  
   119  // ResolveAddr return real ip by net interface
   120  func ResolveAddr(network string, locAddr string) (string, error) {
   121  	return resolveAddr(network, locAddr, true)
   122  }
   123  
   124  func isZeroIPAddr(addr *net.TCPAddr) bool {
   125  	if ipv4 := addr.IP.To4(); ipv4 != nil {
   126  		return net.IPv4zero.Equal(ipv4)
   127  	} else if ipv6 := addr.IP.To16(); ipv6 != nil {
   128  		return net.IPv6zero.Equal(ipv6)
   129  	}
   130  	return false
   131  }
   132  
   133  // HostName return hostname by ip
   134  func HostName(ip string) (hostname string, err error) {
   135  	hostName, err := net.LookupAddr(ip)
   136  	if err != nil {
   137  		return "", err
   138  	}
   139  	return hostName[0], err
   140  }