-
Notifications
You must be signed in to change notification settings - Fork 4.6k
/
client.go
180 lines (146 loc) · 4.43 KB
/
client.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
package shadowsocks
import (
"context"
"runtime"
"time"
"v2ray.com/core/app/log"
"v2ray.com/core/common"
"v2ray.com/core/common/buf"
"v2ray.com/core/common/net"
"v2ray.com/core/common/protocol"
"v2ray.com/core/common/retry"
"v2ray.com/core/common/signal"
"v2ray.com/core/proxy"
"v2ray.com/core/transport/internet"
"v2ray.com/core/transport/ray"
)
// Client is a inbound handler for Shadowsocks protocol
type Client struct {
serverPicker protocol.ServerPicker
}
// NewClient create a new Shadowsocks client.
func NewClient(ctx context.Context, config *ClientConfig) (*Client, error) {
serverList := protocol.NewServerList()
for _, rec := range config.Server {
serverList.AddServer(protocol.NewServerSpecFromPB(*rec))
}
if serverList.Size() == 0 {
return nil, newError("0 server")
}
client := &Client{
serverPicker: protocol.NewRoundRobinServerPicker(serverList),
}
return client, nil
}
// Process implements OutboundHandler.Process().
func (v *Client) Process(ctx context.Context, outboundRay ray.OutboundRay, dialer proxy.Dialer) error {
destination, ok := proxy.TargetFromContext(ctx)
if !ok {
return newError("target not specified")
}
network := destination.Network
var server *protocol.ServerSpec
var conn internet.Connection
err := retry.ExponentialBackoff(5, 100).On(func() error {
server = v.serverPicker.PickServer()
dest := server.Destination()
dest.Network = network
rawConn, err := dialer.Dial(ctx, dest)
if err != nil {
return err
}
conn = rawConn
return nil
})
if err != nil {
return newError("failed to find an available destination").AtWarning().Base(err)
}
log.Trace(newError("tunneling request to ", destination, " via ", server.Destination()))
defer conn.Close()
request := &protocol.RequestHeader{
Version: Version,
Address: destination.Address,
Port: destination.Port,
}
if destination.Network == net.Network_TCP {
request.Command = protocol.RequestCommandTCP
} else {
request.Command = protocol.RequestCommandUDP
}
user := server.PickUser()
rawAccount, err := user.GetTypedAccount()
if err != nil {
return newError("failed to get a valid user account").AtWarning().Base(err)
}
account := rawAccount.(*ShadowsocksAccount)
request.User = user
if account.OneTimeAuth == Account_Auto || account.OneTimeAuth == Account_Enabled {
request.Option |= RequestOptionOneTimeAuth
}
ctx, timer := signal.CancelAfterInactivity(ctx, time.Minute*2)
if request.Command == protocol.RequestCommandTCP {
bufferedWriter := buf.NewBufferedWriter(conn)
bodyWriter, err := WriteTCPRequest(request, bufferedWriter)
if err != nil {
return newError("failed to write request").Base(err)
}
if err := bufferedWriter.SetBuffered(false); err != nil {
return err
}
requestDone := signal.ExecuteAsync(func() error {
if err := buf.Copy(timer, outboundRay.OutboundInput(), bodyWriter); err != nil {
return err
}
return nil
})
responseDone := signal.ExecuteAsync(func() error {
defer outboundRay.OutboundOutput().Close()
responseReader, err := ReadTCPResponse(user, conn)
if err != nil {
return err
}
if err := buf.Copy(timer, responseReader, outboundRay.OutboundOutput()); err != nil {
return err
}
return nil
})
if err := signal.ErrorOrFinish2(ctx, requestDone, responseDone); err != nil {
return newError("connection ends").Base(err)
}
return nil
}
if request.Command == protocol.RequestCommandUDP {
writer := buf.NewSequentialWriter(&UDPWriter{
Writer: conn,
Request: request,
})
requestDone := signal.ExecuteAsync(func() error {
if err := buf.Copy(timer, outboundRay.OutboundInput(), writer); err != nil {
return newError("failed to transport all UDP request").Base(err)
}
return nil
})
responseDone := signal.ExecuteAsync(func() error {
defer outboundRay.OutboundOutput().Close()
reader := &UDPReader{
Reader: conn,
User: user,
}
if err := buf.Copy(timer, reader, outboundRay.OutboundOutput()); err != nil {
return newError("failed to transport all UDP response").Base(err)
}
return nil
})
if err := signal.ErrorOrFinish2(ctx, requestDone, responseDone); err != nil {
return newError("connection ends").Base(err)
}
return nil
}
runtime.KeepAlive(timer)
return nil
}
func init() {
common.Must(common.RegisterConfig((*ClientConfig)(nil), func(ctx context.Context, config interface{}) (interface{}, error) {
return NewClient(ctx, config.(*ClientConfig))
}))
}