/
addr.go
167 lines (141 loc) · 2.87 KB
/
addr.go
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
package addr
import (
"fmt"
"net"
)
var (
privateBlocks []*net.IPNet
)
func init() {
for _, b := range []string{"10.0.0.0/8", "172.16.0.0/12", "192.168.0.0/16", "100.64.0.0/10", "fd00::/8"} {
if _, block, err := net.ParseCIDR(b); err == nil {
privateBlocks = append(privateBlocks, block)
}
}
}
func isPrivateIP(ipAddr string) bool {
ip := net.ParseIP(ipAddr)
for _, priv := range privateBlocks {
if priv.Contains(ip) {
return true
}
}
return false
}
// IsLocal tells us whether an ip is local
func IsLocal(addr string) bool {
// extract the host
host, _, err := net.SplitHostPort(addr)
if err == nil {
addr = host
}
// check if its localhost
if addr == "localhost" {
return true
}
// check against all local ips
for _, ip := range IPs() {
if addr == ip {
return true
}
}
return false
}
// Extract returns a real ip
func Extract(addr string) (string, error) {
// if addr specified then its returned
if len(addr) > 0 && (addr != "0.0.0.0" && addr != "[::]" && addr != "::") {
return addr, nil
}
ifaces, err := net.Interfaces()
if err != nil {
return "", fmt.Errorf("Failed to get interfaces! Err: %v", err)
}
//nolint:prealloc
var addrs []net.Addr
var loAddrs []net.Addr
for _, iface := range ifaces {
ifaceAddrs, err := iface.Addrs()
if err != nil {
// ignore error, interface can dissapear from system
continue
}
if iface.Flags&net.FlagLoopback != 0 {
loAddrs = append(loAddrs, ifaceAddrs...)
continue
}
addrs = append(addrs, ifaceAddrs...)
}
addrs = append(addrs, loAddrs...)
var ipAddr string
var publicIP string
for _, rawAddr := range addrs {
var ip net.IP
switch addr := rawAddr.(type) {
case *net.IPAddr:
ip = addr.IP
case *net.IPNet:
ip = addr.IP
default:
continue
}
if !isPrivateIP(ip.String()) {
publicIP = ip.String()
continue
}
ipAddr = ip.String()
break
}
// return private ip
if len(ipAddr) > 0 {
a := net.ParseIP(ipAddr)
if a == nil {
return "", fmt.Errorf("ip addr %s is invalid", ipAddr)
}
return a.String(), nil
}
// return public or virtual ip
if len(publicIP) > 0 {
a := net.ParseIP(publicIP)
if a == nil {
return "", fmt.Errorf("ip addr %s is invalid", publicIP)
}
return a.String(), nil
}
return "", fmt.Errorf("No IP address found, and explicit IP not provided")
}
// IPs returns all known ips
func IPs() []string {
ifaces, err := net.Interfaces()
if err != nil {
return nil
}
var ipAddrs []string
for _, i := range ifaces {
addrs, err := i.Addrs()
if err != nil {
continue
}
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 == nil {
continue
}
// dont skip ipv6 addrs
/*
ip = ip.To4()
if ip == nil {
continue
}
*/
ipAddrs = append(ipAddrs, ip.String())
}
}
return ipAddrs
}