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
|
// Copyright 2021 CNI authors
//
// Licensed 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 ip
import (
"fmt"
"net"
"strings"
)
// IP is a CNI maintained type inherited from net.IPNet which can
// represent a single IP address with or without prefix.
type IP struct {
net.IPNet
}
// newIP will create an IP with net.IP and net.IPMask
func newIP(ip net.IP, mask net.IPMask) *IP {
return &IP{
IPNet: net.IPNet{
IP: ip,
Mask: mask,
},
}
}
// ParseIP will parse string s as an IP, and return it.
// The string s must be formed like <ip>[/<prefix>].
// If s is not a valid textual representation of an IP,
// will return nil.
func ParseIP(s string) *IP {
if strings.ContainsAny(s, "/") {
ip, ipNet, err := net.ParseCIDR(s)
if err != nil {
return nil
}
return newIP(ip, ipNet.Mask)
} else {
ip := net.ParseIP(s)
if ip == nil {
return nil
}
return newIP(ip, nil)
}
}
// ToIP will return a net.IP in standard form from this IP.
// If this IP can not be converted to a valid net.IP, will return nil.
func (i *IP) ToIP() net.IP {
switch {
case i.IP.To4() != nil:
return i.IP.To4()
case i.IP.To16() != nil:
return i.IP.To16()
default:
return nil
}
}
// String returns the string form of this IP.
func (i *IP) String() string {
if len(i.Mask) > 0 {
return i.IPNet.String()
}
return i.IP.String()
}
// MarshalText implements the encoding.TextMarshaler interface.
// The encoding is the same as returned by String,
// But when len(ip) is zero, will return an empty slice.
func (i *IP) MarshalText() ([]byte, error) {
if len(i.IP) == 0 {
return []byte{}, nil
}
return []byte(i.String()), nil
}
// UnmarshalText implements the encoding.TextUnmarshaler interface.
// The textual bytes are expected in a form accepted by Parse,
// But when len(b) is zero, will return an empty IP.
func (i *IP) UnmarshalText(b []byte) error {
if len(b) == 0 {
*i = IP{}
return nil
}
ip := ParseIP(string(b))
if ip == nil {
return fmt.Errorf("invalid IP address %s", string(b))
}
*i = *ip
return nil
}
|
