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
|
// Copyright 2018 The go-ethereum Authors
// This file is part of the go-ethereum library.
//
// The go-ethereum library is free software: you can redistribute it and/or modify
// it under the terms of the GNU Lesser General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// The go-ethereum library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public License
// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
package enode
import (
"crypto/ecdsa"
"encoding/hex"
"errors"
"fmt"
"net"
"net/url"
"regexp"
"strconv"
"github.com/dexon-foundation/dexon/common/math"
"github.com/dexon-foundation/dexon/crypto"
"github.com/dexon-foundation/dexon/p2p/enr"
)
var incompleteNodeURL = regexp.MustCompile("(?i)^(?:enode://)?([0-9a-f]+)$")
// MustParseV4 parses a node URL. It panics if the URL is not valid.
func MustParseV4(rawurl string) *Node {
n, err := ParseV4(rawurl)
if err != nil {
panic("invalid node URL: " + err.Error())
}
return n
}
// ParseV4 parses a node URL.
//
// There are two basic forms of node URLs:
//
// - incomplete nodes, which only have the public key (node ID)
// - complete nodes, which contain the public key and IP/Port information
//
// For incomplete nodes, the designator must look like one of these
//
// enode://<hex node id>
// <hex node id>
//
// For complete nodes, the node ID is encoded in the username portion
// of the URL, separated from the host by an @ sign. The hostname can
// only be given as an IP address, DNS domain names are not allowed.
// The port in the host name section is the TCP listening port. If the
// TCP and UDP (discovery) ports differ, the UDP port is specified as
// query parameter "discport".
//
// In the following example, the node URL describes
// a node with IP address 10.3.58.6, TCP listening port 30303
// and UDP discovery port 30301.
//
// enode://<hex node id>@10.3.58.6:30303?discport=30301
func ParseV4(rawurl string) (*Node, error) {
if m := incompleteNodeURL.FindStringSubmatch(rawurl); m != nil {
id, err := parsePubkey(m[1])
if err != nil {
return nil, fmt.Errorf("invalid node ID (%v)", err)
}
return NewV4(id, nil, 0, 0), nil
}
return parseComplete(rawurl)
}
// NewV4 creates a node from discovery v4 node information. The record
// contained in the node has a zero-length signature.
func NewV4(pubkey *ecdsa.PublicKey, ip net.IP, tcp, udp int) *Node {
var r enr.Record
if ip != nil {
r.Set(enr.IP(ip))
}
if udp != 0 {
r.Set(enr.UDP(udp))
}
if tcp != 0 {
r.Set(enr.TCP(tcp))
}
signV4Compat(&r, pubkey)
n, err := New(v4CompatID{}, &r)
if err != nil {
panic(err)
}
return n
}
func parseComplete(rawurl string) (*Node, error) {
var (
id *ecdsa.PublicKey
ip net.IP
tcpPort, udpPort uint64
)
u, err := url.Parse(rawurl)
if err != nil {
return nil, err
}
if u.Scheme != "enode" {
return nil, errors.New("invalid URL scheme, want \"enode\"")
}
// Parse the Node ID from the user portion.
if u.User == nil {
return nil, errors.New("does not contain node ID")
}
if id, err = parsePubkey(u.User.String()); err != nil {
return nil, fmt.Errorf("invalid node ID (%v)", err)
}
// Parse the IP address.
host, port, err := net.SplitHostPort(u.Host)
if err != nil {
return nil, fmt.Errorf("invalid host: %v", err)
}
if ip = net.ParseIP(host); ip == nil {
return nil, errors.New("invalid IP address")
}
// Ensure the IP is 4 bytes long for IPv4 addresses.
if ipv4 := ip.To4(); ipv4 != nil {
ip = ipv4
}
// Parse the port numbers.
if tcpPort, err = strconv.ParseUint(port, 10, 16); err != nil {
return nil, errors.New("invalid port")
}
udpPort = tcpPort
qv := u.Query()
if qv.Get("discport") != "" {
udpPort, err = strconv.ParseUint(qv.Get("discport"), 10, 16)
if err != nil {
return nil, errors.New("invalid discport in query")
}
}
return NewV4(id, ip, int(tcpPort), int(udpPort)), nil
}
// parsePubkey parses a hex-encoded secp256k1 public key.
func parsePubkey(in string) (*ecdsa.PublicKey, error) {
b, err := hex.DecodeString(in)
if err != nil {
return nil, err
} else if len(b) != 64 {
return nil, fmt.Errorf("wrong length, want %d hex chars", 128)
}
b = append([]byte{0x4}, b...)
return crypto.UnmarshalPubkey(b)
}
func (n *Node) v4URL() string {
var (
scheme enr.ID
nodeid string
key ecdsa.PublicKey
)
n.Load(&scheme)
n.Load((*Secp256k1)(&key))
switch {
case scheme == "v4" || key != ecdsa.PublicKey{}:
nodeid = fmt.Sprintf("%x", crypto.FromECDSAPub(&key)[1:])
default:
nodeid = fmt.Sprintf("%s.%x", scheme, n.id[:])
}
u := url.URL{Scheme: "enode"}
if n.Incomplete() {
u.Host = nodeid
} else {
addr := net.TCPAddr{IP: n.IP(), Port: n.TCP()}
u.User = url.User(nodeid)
u.Host = addr.String()
if n.UDP() != n.TCP() {
u.RawQuery = "discport=" + strconv.Itoa(n.UDP())
}
}
return u.String()
}
// PubkeyToIDV4 derives the v4 node address from the given public key.
func PubkeyToIDV4(key *ecdsa.PublicKey) ID {
e := make([]byte, 64)
math.ReadBits(key.X, e[:len(e)/2])
math.ReadBits(key.Y, e[len(e)/2:])
return ID(crypto.Keccak256Hash(e))
}
|
