This repository has been archived by the owner on Oct 5, 2021. It is now read-only.
-
Notifications
You must be signed in to change notification settings - Fork 26
/
convert.go
269 lines (240 loc) · 5.7 KB
/
convert.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
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
package manet
import (
"fmt"
"net"
"path/filepath"
ma "github.com/multiformats/go-multiaddr"
madns "github.com/multiformats/go-multiaddr-dns"
)
var errIncorrectNetAddr = fmt.Errorf("incorrect network addr conversion")
// FromNetAddr converts a net.Addr type to a Multiaddr.
func FromNetAddr(a net.Addr) (ma.Multiaddr, error) {
return defaultCodecs.FromNetAddr(a)
}
// FromNetAddr converts a net.Addr to Multiaddress.
func (cm *CodecMap) FromNetAddr(a net.Addr) (ma.Multiaddr, error) {
if a == nil {
return nil, fmt.Errorf("nil multiaddr")
}
p, err := cm.getAddrParser(a.Network())
if err != nil {
return nil, err
}
return p(a)
}
// ToNetAddr converts a Multiaddr to a net.Addr
// Must be ThinWaist. acceptable protocol stacks are:
// /ip{4,6}/{tcp, udp}
func ToNetAddr(maddr ma.Multiaddr) (net.Addr, error) {
return defaultCodecs.ToNetAddr(maddr)
}
// ToNetAddr converts a Multiaddress to a standard net.Addr.
func (cm *CodecMap) ToNetAddr(maddr ma.Multiaddr) (net.Addr, error) {
protos := maddr.Protocols()
final := protos[len(protos)-1]
p, err := cm.getMaddrParser(final.Name)
if err != nil {
return nil, err
}
return p(maddr)
}
func parseBasicNetMaddr(maddr ma.Multiaddr) (net.Addr, error) {
network, host, err := DialArgs(maddr)
if err != nil {
return nil, err
}
switch network {
case "tcp", "tcp4", "tcp6":
return net.ResolveTCPAddr(network, host)
case "udp", "udp4", "udp6":
return net.ResolveUDPAddr(network, host)
case "ip", "ip4", "ip6":
return net.ResolveIPAddr(network, host)
case "unix":
return net.ResolveUnixAddr(network, host)
}
return nil, fmt.Errorf("network not supported: %s", network)
}
func FromIPAndZone(ip net.IP, zone string) (ma.Multiaddr, error) {
switch {
case ip.To4() != nil:
return ma.NewComponent("ip4", ip.String())
case ip.To16() != nil:
ip6, err := ma.NewComponent("ip6", ip.String())
if err != nil {
return nil, err
}
if zone == "" {
return ip6, nil
} else {
zone, err := ma.NewComponent("ip6zone", zone)
if err != nil {
return nil, err
}
return zone.Encapsulate(ip6), nil
}
default:
return nil, errIncorrectNetAddr
}
}
// FromIP converts a net.IP type to a Multiaddr.
func FromIP(ip net.IP) (ma.Multiaddr, error) {
return FromIPAndZone(ip, "")
}
// DialArgs is a convenience function that returns network and address as
// expected by net.Dial. See https://godoc.org/net#Dial for an overview of
// possible return values (we do not support the unixpacket ones yet). Unix
// addresses do not, at present, compose.
func DialArgs(m ma.Multiaddr) (string, string, error) {
var (
zone, network, ip, port string
err error
hostname bool
)
ma.ForEach(m, func(c ma.Component) bool {
switch network {
case "":
switch c.Protocol().Code {
case ma.P_IP6ZONE:
if zone != "" {
err = fmt.Errorf("%s has multiple zones", m)
return false
}
zone = c.Value()
return true
case ma.P_IP6:
network = "ip6"
ip = c.Value()
return true
case ma.P_IP4:
if zone != "" {
err = fmt.Errorf("%s has ip4 with zone", m)
return false
}
network = "ip4"
ip = c.Value()
return true
case madns.Dns4Protocol.Code:
network = "ip4"
hostname = true
ip = c.Value()
return true
case madns.Dns6Protocol.Code:
network = "ip6"
hostname = true
ip = c.Value()
return true
case ma.P_UNIX:
network = "unix"
ip = c.Value()
return false
}
case "ip4":
switch c.Protocol().Code {
case ma.P_UDP:
network = "udp4"
case ma.P_TCP:
network = "tcp4"
default:
return false
}
port = c.Value()
case "ip6":
switch c.Protocol().Code {
case ma.P_UDP:
network = "udp6"
case ma.P_TCP:
network = "tcp6"
default:
return false
}
port = c.Value()
}
// Done.
return false
})
if err != nil {
return "", "", err
}
switch network {
case "ip6":
if zone != "" {
ip += "%" + zone
}
fallthrough
case "ip4":
return network, ip, nil
case "tcp4", "udp4":
return network, ip + ":" + port, nil
case "tcp6", "udp6":
if zone != "" {
ip += "%" + zone
}
if hostname {
return network, ip + ":" + port, nil
}
return network, "[" + ip + "]" + ":" + port, nil
case "unix":
return network, ip, nil
default:
return "", "", fmt.Errorf("%s is not a 'thin waist' address", m)
}
}
func parseTCPNetAddr(a net.Addr) (ma.Multiaddr, error) {
ac, ok := a.(*net.TCPAddr)
if !ok {
return nil, errIncorrectNetAddr
}
// Get IP Addr
ipm, err := FromIPAndZone(ac.IP, ac.Zone)
if err != nil {
return nil, errIncorrectNetAddr
}
// Get TCP Addr
tcpm, err := ma.NewMultiaddr(fmt.Sprintf("/tcp/%d", ac.Port))
if err != nil {
return nil, errIncorrectNetAddr
}
// Encapsulate
return ipm.Encapsulate(tcpm), nil
}
func parseUDPNetAddr(a net.Addr) (ma.Multiaddr, error) {
ac, ok := a.(*net.UDPAddr)
if !ok {
return nil, errIncorrectNetAddr
}
// Get IP Addr
ipm, err := FromIPAndZone(ac.IP, ac.Zone)
if err != nil {
return nil, errIncorrectNetAddr
}
// Get UDP Addr
udpm, err := ma.NewMultiaddr(fmt.Sprintf("/udp/%d", ac.Port))
if err != nil {
return nil, errIncorrectNetAddr
}
// Encapsulate
return ipm.Encapsulate(udpm), nil
}
func parseIPNetAddr(a net.Addr) (ma.Multiaddr, error) {
ac, ok := a.(*net.IPAddr)
if !ok {
return nil, errIncorrectNetAddr
}
return FromIPAndZone(ac.IP, ac.Zone)
}
func parseIPPlusNetAddr(a net.Addr) (ma.Multiaddr, error) {
ac, ok := a.(*net.IPNet)
if !ok {
return nil, errIncorrectNetAddr
}
return FromIP(ac.IP)
}
func parseUnixNetAddr(a net.Addr) (ma.Multiaddr, error) {
ac, ok := a.(*net.UnixAddr)
if !ok {
return nil, errIncorrectNetAddr
}
cleaned := filepath.Clean(ac.Name)
return ma.NewComponent("unix", cleaned)
}