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
| package shadowsocksr
import (
"context"
"errors"
"fmt"
"net"
"github.com/sagernet/sing-box/adapter"
"github.com/sagernet/sing-box/adapter/outbound"
"github.com/sagernet/sing-box/common/dialer"
C "github.com/sagernet/sing-box/constant"
"github.com/sagernet/sing-box/log"
"github.com/sagernet/sing-box/option"
"github.com/sagernet/sing-box/transport/clashssr/obfs"
"github.com/sagernet/sing-box/transport/clashssr/protocol"
"github.com/sagernet/sing/common/bufio"
E "github.com/sagernet/sing/common/exceptions"
"github.com/sagernet/sing/common/logger"
M "github.com/sagernet/sing/common/metadata"
N "github.com/sagernet/sing/common/network"
"github.com/Dreamacro/clash/transport/shadowsocks/core"
"github.com/Dreamacro/clash/transport/shadowsocks/shadowstream"
"github.com/Dreamacro/clash/transport/socks5"
)
func RegisterOutbound(registry *outbound.Registry) {
outbound.Register[option.ShadowsocksROutboundOptions](registry, C.TypeShadowsocksR, NewOutbound)
}
type Outbound struct {
outbound.Adapter
logger logger.ContextLogger
dialer N.Dialer
serverAddr M.Socksaddr
cipher core.Cipher
obfs obfs.Obfs
protocol protocol.Protocol
}
func NewOutbound(ctx context.Context, router adapter.Router, logger log.ContextLogger, tag string, options option.ShadowsocksROutboundOptions) (adapter.Outbound, error) {
outboundDialer, err := dialer.New(ctx, options.DialerOptions, options.ServerIsDomain())
if err != nil {
return nil, err
}
outbound := &Outbound{
logger: logger,
Adapter: outbound.NewAdapterWithDialerOptions(C.TypeShadowsocksR, tag, options.Network.Build(), options.DialerOptions),
dialer: outboundDialer,
serverAddr: options.ServerOptions.Build(),
}
var cipher string
switch options.Method {
case "none":
cipher = "dummy"
default:
cipher = options.Method
}
outbound.cipher, err = core.PickCipher(cipher, nil, options.Password)
if err != nil {
return nil, err
}
var (
ivSize int
key []byte
)
if cipher == "dummy" {
ivSize = 0
key = core.Kdf(options.Password, 16)
} else {
streamCipher, ok := outbound.cipher.(*core.StreamCipher)
if !ok {
return nil, fmt.Errorf("%s is not none or a supported stream cipher in ssr", cipher)
}
ivSize = streamCipher.IVSize()
key = streamCipher.Key
}
obfs, obfsOverhead, err := obfs.PickObfs(options.Obfs, &obfs.Base{
Host: options.Server,
Port: int(options.ServerPort),
Key: key,
IVSize: ivSize,
Param: options.ObfsParam,
})
if err != nil {
return nil, E.Cause(err, "initialize obfs")
}
protocol, err := protocol.PickProtocol(options.Protocol, &protocol.Base{
Key: key,
Overhead: obfsOverhead,
Param: options.ProtocolParam,
})
if err != nil {
return nil, E.Cause(err, "initialize protocol")
}
outbound.obfs = obfs
outbound.protocol = protocol
return outbound, nil
}
func (h *Outbound) DialContext(ctx context.Context, network string, destination M.Socksaddr) (net.Conn, error) {
ctx, metadata := adapter.ExtendContext(ctx)
metadata.Outbound = h.Tag()
metadata.Destination = destination
switch network {
case N.NetworkTCP:
h.logger.InfoContext(ctx, "outbound connection to ", destination)
conn, err := h.dialer.DialContext(ctx, network, h.serverAddr)
if err != nil {
return nil, err
}
conn = h.cipher.StreamConn(h.obfs.StreamConn(conn))
writeIv, err := conn.(*shadowstream.Conn).ObtainWriteIV()
if err != nil {
conn.Close()
return nil, err
}
conn = h.protocol.StreamConn(conn, writeIv)
err = M.SocksaddrSerializer.WriteAddrPort(conn, destination)
if err != nil {
conn.Close()
return nil, E.Cause(err, "write request")
}
return conn, nil
case N.NetworkUDP:
conn, err := h.ListenPacket(ctx, destination)
if err != nil {
return nil, err
}
return bufio.NewBindPacketConn(conn, destination), nil
default:
return nil, E.Extend(N.ErrUnknownNetwork, network)
}
}
func (h *Outbound) ListenPacket(ctx context.Context, destination M.Socksaddr) (net.PacketConn, error) {
ctx, metadata := adapter.ExtendContext(ctx)
metadata.Outbound = h.Tag()
metadata.Destination = destination
h.logger.InfoContext(ctx, "outbound packet connection to ", destination)
outConn, err := h.dialer.DialContext(ctx, N.NetworkUDP, h.serverAddr)
if err != nil {
return nil, err
}
packetConn := h.cipher.PacketConn(bufio.NewUnbindPacketConn(outConn))
packetConn = h.protocol.PacketConn(packetConn)
packetConn = &ssPacketConn{packetConn, outConn.RemoteAddr()}
return packetConn, nil
}
func (h *Outbound) InterfaceUpdated() {
return
}
func (h *Outbound) Close() error {
return nil
}
type ssPacketConn struct {
net.PacketConn
rAddr net.Addr
}
func (spc *ssPacketConn) WriteTo(b []byte, addr net.Addr) (n int, err error) {
packet, err := socks5.EncodeUDPPacket(socks5.ParseAddrToSocksAddr(addr), b)
if err != nil {
return
}
return spc.PacketConn.WriteTo(packet[3:], spc.rAddr)
}
func (spc *ssPacketConn) ReadFrom(b []byte) (int, net.Addr, error) {
n, _, e := spc.PacketConn.ReadFrom(b)
if e != nil {
return 0, nil, e
}
addr := socks5.SplitAddr(b[:n])
if addr == nil {
return 0, nil, errors.New("parse addr error")
}
udpAddr := addr.UDPAddr()
if udpAddr == nil {
return 0, nil, errors.New("parse addr error")
}
copy(b, b[len(addr):])
return n - len(addr), udpAddr, e
}
|
