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
|
package main
import (
"bytes"
"net"
"testing"
)
func mustParseCIDR(s string) *net.IPNet {
_, ipnet, err := net.ParseCIDR(s)
if err != nil {
panic(err)
}
return ipnet
}
func TestRandAddr(t *testing.T) {
outer:
for _, ipnet := range []*net.IPNet{
mustParseCIDR("127.0.0.1/0"),
mustParseCIDR("127.0.0.1/24"),
mustParseCIDR("127.0.0.55/32"),
mustParseCIDR("2001:db8::1234/0"),
mustParseCIDR("2001:db8::1234/32"),
mustParseCIDR("2001:db8::1234/128"),
// Non-canonical masks (that don't consist of 1s followed by 0s)
// work too, why not.
&net.IPNet{
IP: net.IP{1, 2, 3, 4},
Mask: net.IPMask{0x00, 0x07, 0xff, 0xff},
},
} {
for i := 0; i < 100; i++ {
ip, err := randIPAddr(ipnet)
if err != nil {
t.Errorf("%v returned error %v", ipnet, err)
continue outer
}
if !ipnet.Contains(ip) {
t.Errorf("%v does not contain %v", ipnet, ip)
continue outer
}
}
}
}
func TestRandAddrUnequalLengths(t *testing.T) {
for _, ipnet := range []*net.IPNet{
&net.IPNet{
IP: net.IP{1, 2, 3, 4},
Mask: net.CIDRMask(32, 128),
},
&net.IPNet{
IP: net.IP{1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15},
Mask: net.CIDRMask(24, 32),
},
&net.IPNet{
IP: net.IP{1, 2, 3, 4},
Mask: net.IPMask{},
},
&net.IPNet{
IP: net.IP{1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15},
Mask: net.IPMask{},
},
} {
_, err := randIPAddr(ipnet)
if err == nil {
t.Errorf("%v did not result in error, but should have", ipnet)
}
}
}
func BenchmarkRandAddr(b *testing.B) {
for _, test := range []struct {
label string
ipnet net.IPNet
}{
{"IPv4/32", net.IPNet{IP: net.IP{127, 0, 0, 1}, Mask: net.CIDRMask(32, 32)}},
{"IPv4/24", net.IPNet{IP: net.IP{127, 0, 0, 1}, Mask: net.CIDRMask(32, 32)}},
{"IPv6/64", net.IPNet{
IP: net.IP{0x20, 0x01, 0x0d, 0xb8, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0x12, 0x34},
Mask: net.CIDRMask(64, 128),
}},
{"IPv6/128", net.IPNet{
IP: net.IP{0x20, 0x01, 0x0d, 0xb8, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0x12, 0x34},
Mask: net.CIDRMask(128, 128),
}},
} {
b.Run(test.label, func(b *testing.B) {
for i := 0; i < b.N; i++ {
_, err := randIPAddr(&test.ipnet)
if err != nil {
b.Fatal(err)
}
}
})
}
}
func ipNetEqual(a, b *net.IPNet) bool {
if !a.IP.Equal(b.IP) {
return false
}
// Comparing masks for equality is a little tricky because they may be
// different lengths. For masks in canonical form (those for which
// Size() returns other than (0, 0)), we consider two masks equal if the
// numbers of bits *not* covered by the prefix are equal; e.g.
// (120, 128) is equal to (24, 32), because they both have 8 bits not in
// the prefix. If either mask is not in canonical form, we require them
// to be equal as byte arrays (which includes length).
aOnes, aBits := a.Mask.Size()
bOnes, bBits := b.Mask.Size()
if aBits == 0 || bBits == 0 {
return bytes.Equal(a.Mask, b.Mask)
} else {
return aBits-aOnes == bBits-bOnes
}
}
func TestParseIPCIDR(t *testing.T) {
// Well-formed inputs.
for _, test := range []struct {
input string
expected *net.IPNet
}{
{"127.0.0.123", mustParseCIDR("127.0.0.123/32")},
{"127.0.0.123/0", mustParseCIDR("127.0.0.123/0")},
{"127.0.0.123/24", mustParseCIDR("127.0.0.123/24")},
{"127.0.0.123/32", mustParseCIDR("127.0.0.123/32")},
{"2001:db8::1234", mustParseCIDR("2001:db8::1234/128")},
{"2001:db8::1234/0", mustParseCIDR("2001:db8::1234/0")},
{"2001:db8::1234/32", mustParseCIDR("2001:db8::1234/32")},
{"2001:db8::1234/128", mustParseCIDR("2001:db8::1234/128")},
} {
ipnet, err := parseIPCIDR(test.input)
if err != nil {
t.Errorf("%q returned error %v", test.input, err)
continue
}
if !ipNetEqual(ipnet, test.expected) {
t.Errorf("%q → %v, expected %v", test.input, ipnet, test.expected)
}
}
// Bad inputs.
for _, input := range []string{
"",
"1.2.3",
"1.2.3/16",
"2001:db8:1234",
"2001:db8:1234/64",
"localhost",
} {
_, err := parseIPCIDR(input)
if err == nil {
t.Errorf("%q did not result in error, but should have", input)
}
}
}
|
