forked from A7610605/phantomsocks
-
Notifications
You must be signed in to change notification settings - Fork 0
/
udp.go
221 lines (200 loc) · 4.89 KB
/
udp.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
package phantomtcp
import (
"encoding/binary"
"errors"
"math/rand"
"net"
"time"
)
func ComputeUDPChecksum(buffer []byte) uint16 {
checksum := uint32(binary.BigEndian.Uint16(buffer[12:14]))
checksum += uint32(binary.BigEndian.Uint16(buffer[14:16]))
checksum += uint32(binary.BigEndian.Uint16(buffer[16:18]))
checksum += uint32(binary.BigEndian.Uint16(buffer[18:20]))
checksum += uint32(17)
checksum += uint32(binary.BigEndian.Uint16(buffer[24:26]))
checksum += uint32(binary.BigEndian.Uint16(buffer[20:22]))
checksum += uint32(binary.BigEndian.Uint16(buffer[22:24]))
checksum += uint32(binary.BigEndian.Uint16(buffer[24:26]))
offset := 28
bufferLen := len(buffer)
for {
if offset > bufferLen-2 {
if offset == bufferLen-1 {
checksum += uint32(buffer[offset]) << 8
}
break
}
checksum += uint32(binary.BigEndian.Uint16(buffer[offset : offset+2]))
offset += 2
}
checksum = (checksum & 0xffff) + (checksum >> 16)
checksum = (checksum & 0xffff) + (checksum >> 16)
return ^uint16(checksum)
}
func relayUDP(left, right net.Conn) error {
ch := make(chan error)
go func() {
data := make([]byte, 1500)
for {
left.SetReadDeadline(time.Now().Add(time.Minute * 2))
n, err := left.Read(data)
if err != nil {
ch <- err
right.SetDeadline(time.Now())
left.SetDeadline(time.Now())
break
}
right.Write(data[:n])
}
}()
data := make([]byte, 1500)
var err error
for {
right.SetReadDeadline(time.Now().Add(time.Minute * 2))
var n int
n, err = right.Read(data)
if err != nil {
right.SetDeadline(time.Now())
left.SetDeadline(time.Now())
break
}
left.Write(data[:n])
}
ch_err := <-ch
if err == nil {
err = ch_err
}
return err
}
func (server *PhantomInterface) DialUDP(host string, port int) (net.Conn, net.Conn, error) {
raddrs, err := server.GetRemoteAddresses(host, port)
if err != nil {
return nil, nil, err
}
raddr := raddrs[rand.Intn(len(raddrs))]
proxy_err := errors.New("invalid proxy")
var tcpConn net.Conn = nil
switch server.Protocol {
case DIRECT:
fallthrough
case REDIRECT:
fallthrough
case NAT64:
var laddr *net.UDPAddr = nil
if server.Device != "" {
_laddr, err := GetLocalAddr(server.Device, raddr.IP.To4() == nil)
if err != nil {
return nil, nil, err
}
laddr = &net.UDPAddr{IP: _laddr.IP, Port: 0}
}
udpConn, err := net.DialUDP("udp", laddr, &net.UDPAddr{IP: raddr.IP, Port: raddr.Port})
return udpConn, nil, err
case SOCKS5:
var proxy_seq uint32 = 0
var synpacket *ConnectionInfo
var hint uint32 = 0
laddr, err := GetLocalAddr(server.Device, raddr.IP.To4() == nil)
if err != nil {
return nil, nil, err
}
hint = server.Hint & OPT_MODIFY
if hint != 0 {
tcpConn, synpacket, err = DialConnInfo(laddr, raddr, server, nil)
if err != nil {
return nil, nil, err
}
if synpacket == nil {
if tcpConn != nil {
tcpConn.Close()
}
return nil, nil, errors.New("connection does not exist")
}
synpacket.TCP.Seq++
} else {
tcpConn, err = net.DialTCP("tcp", laddr, raddr)
if err != nil {
return nil, nil, err
}
}
var b [264]byte
if hint != 0 {
err := ModifyAndSendPacket(synpacket, b[:], hint, server.TTL, 2)
if err != nil {
tcpConn.Close()
return nil, nil, err
}
}
n, err := tcpConn.Write([]byte{0x05, 0x01, 0x00})
if err != nil {
tcpConn.Close()
return nil, nil, err
}
proxy_seq += uint32(n)
_, err = tcpConn.Read(b[:])
if err != nil {
tcpConn.Close()
return nil, nil, err
}
if b[0] != 0x05 {
tcpConn.Close()
return nil, nil, proxy_err
}
copy(b[:], []byte{0x05, 0x03, 0x00, 0x03})
hostLen := len(host)
b[4] = byte(hostLen)
copy(b[5:], []byte(host))
binary.BigEndian.PutUint16(b[5+hostLen:], uint16(port))
n, err = tcpConn.Write(b[:7+hostLen])
if err != nil {
tcpConn.Close()
return nil, nil, err
}
proxy_seq += uint32(n)
n, err = tcpConn.Read(b[:])
if err != nil {
tcpConn.Close()
return nil, nil, err
}
if n < 4 || b[0] != 0x05 || b[1] != 0x00 {
tcpConn.Close()
return nil, nil, proxy_err
}
var udpAddr net.UDPAddr
switch b[3] {
case 1:
port := int(binary.BigEndian.Uint16(b[8:10]))
udpAddr = net.UDPAddr{IP: net.IP(b[4:8]), Port: port}
case 4:
port := int(binary.BigEndian.Uint16(b[20:22]))
udpAddr = net.UDPAddr{IP: net.IP(b[4:20]), Port: port}
default:
tcpConn.Close()
return nil, nil, proxy_err
}
udpConn, err := net.DialUDP("udp", nil, &udpAddr)
return udpConn, tcpConn, err
case WIREGUARD:
udpConn, err := WireGuardDialUDP(server.Device, &net.UDPAddr{IP: raddr.IP, Port: raddr.Port})
return udpConn, nil, err
}
return nil, nil, proxy_err
}
func GetQUICVersion(data []byte) uint32 {
if len(data) < 5 {
return 0xffffffff
}
if data[0]&0xC0 != 0xC0 {
return 0xffffffff
}
Version := binary.BigEndian.Uint32(data[1:5])
switch Version {
case 0xff00001d:
return Version
case 0x00000001:
return Version
default:
return 0
}
}