-
Notifications
You must be signed in to change notification settings - Fork 4.6k
/
client.go
230 lines (203 loc) · 6.99 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
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
package socks
import (
"context"
"time"
core "github.com/v2fly/v2ray-core/v5"
"github.com/v2fly/v2ray-core/v5/common"
"github.com/v2fly/v2ray-core/v5/common/buf"
"github.com/v2fly/v2ray-core/v5/common/net"
"github.com/v2fly/v2ray-core/v5/common/net/packetaddr"
"github.com/v2fly/v2ray-core/v5/common/protocol"
"github.com/v2fly/v2ray-core/v5/common/retry"
"github.com/v2fly/v2ray-core/v5/common/session"
"github.com/v2fly/v2ray-core/v5/common/signal"
"github.com/v2fly/v2ray-core/v5/common/task"
"github.com/v2fly/v2ray-core/v5/features/dns"
"github.com/v2fly/v2ray-core/v5/features/policy"
"github.com/v2fly/v2ray-core/v5/transport"
"github.com/v2fly/v2ray-core/v5/transport/internet"
"github.com/v2fly/v2ray-core/v5/transport/internet/udp"
)
// Client is a Socks5 client.
type Client struct {
serverPicker protocol.ServerPicker
policyManager policy.Manager
version Version
dns dns.Client
}
// NewClient create a new Socks5 client based on the given config.
func NewClient(ctx context.Context, config *ClientConfig) (*Client, error) {
serverList := protocol.NewServerList()
for _, rec := range config.Server {
s, err := protocol.NewServerSpecFromPB(rec)
if err != nil {
return nil, newError("failed to get server spec").Base(err)
}
serverList.AddServer(s)
}
if serverList.Size() == 0 {
return nil, newError("0 target server")
}
v := core.MustFromContext(ctx)
c := &Client{
serverPicker: protocol.NewRoundRobinServerPicker(serverList),
policyManager: v.GetFeature(policy.ManagerType()).(policy.Manager),
version: config.Version,
}
if config.Version == Version_SOCKS4 {
c.dns = v.GetFeature(dns.ClientType()).(dns.Client)
}
return c, nil
}
// Process implements proxy.Outbound.Process.
func (c *Client) Process(ctx context.Context, link *transport.Link, dialer internet.Dialer) error {
outbound := session.OutboundFromContext(ctx)
if outbound == nil || !outbound.Target.IsValid() {
return newError("target not specified.")
}
// Destination of the inner request.
destination := outbound.Target
// Outbound server.
var server *protocol.ServerSpec
// Outbound server's destination.
var dest net.Destination
// Connection to the outbound server.
var conn internet.Connection
if err := retry.ExponentialBackoff(5, 100).On(func() error {
server = c.serverPicker.PickServer()
dest = server.Destination()
rawConn, err := dialer.Dial(ctx, dest)
if err != nil {
return err
}
conn = rawConn
return nil
}); err != nil {
return newError("failed to find an available destination").Base(err)
}
defer func() {
if err := conn.Close(); err != nil {
newError("failed to closed connection").Base(err).WriteToLog(session.ExportIDToError(ctx))
}
}()
p := c.policyManager.ForLevel(0)
request := &protocol.RequestHeader{
Version: socks5Version,
Command: protocol.RequestCommandTCP,
Address: destination.Address,
Port: destination.Port,
}
switch c.version {
case Version_SOCKS4:
if request.Address.Family().IsDomain() {
if d, ok := c.dns.(dns.ClientWithIPOption); ok {
d.SetFakeDNSOption(false) // Skip FakeDNS
} else {
newError("DNS client doesn't implement ClientWithIPOption")
}
lookupFunc := c.dns.LookupIP
if lookupIPv4, ok := c.dns.(dns.IPv4Lookup); ok {
lookupFunc = lookupIPv4.LookupIPv4
}
ips, err := lookupFunc(request.Address.Domain())
if err != nil {
return err
} else if len(ips) == 0 {
return dns.ErrEmptyResponse
}
request.Address = net.IPAddress(ips[0])
}
fallthrough
case Version_SOCKS4A:
request.Version = socks4Version
if destination.Network == net.Network_UDP {
return newError("udp is not supported in socks4")
} else if destination.Address.Family().IsIPv6() {
return newError("ipv6 is not supported in socks4")
}
}
if destination.Network == net.Network_UDP {
request.Command = protocol.RequestCommandUDP
}
user := server.PickUser()
if user != nil {
request.User = user
p = c.policyManager.ForLevel(user.Level)
}
if err := conn.SetDeadline(time.Now().Add(p.Timeouts.Handshake)); err != nil {
newError("failed to set deadline for handshake").Base(err).WriteToLog(session.ExportIDToError(ctx))
}
udpRequest, err := ClientHandshake(request, conn, conn)
if err != nil {
return newError("failed to establish connection to server").AtWarning().Base(err)
}
if udpRequest != nil {
if udpRequest.Address == net.AnyIP || udpRequest.Address == net.AnyIPv6 {
udpRequest.Address = dest.Address
}
}
if err := conn.SetDeadline(time.Time{}); err != nil {
newError("failed to clear deadline after handshake").Base(err).WriteToLog(session.ExportIDToError(ctx))
}
ctx, cancel := context.WithCancel(ctx)
timer := signal.CancelAfterInactivity(ctx, cancel, p.Timeouts.ConnectionIdle)
if packetConn, err := packetaddr.ToPacketAddrConn(link, destination); err == nil {
udpConn, err := dialer.Dial(ctx, udpRequest.Destination())
if err != nil {
return newError("failed to create UDP connection").Base(err)
}
defer udpConn.Close()
requestDone := func() error {
protocolWriter := NewUDPWriter(request, udpConn)
return udp.CopyPacketConn(protocolWriter, packetConn, udp.UpdateActivity(timer))
}
responseDone := func() error {
protocolReader := &UDPReader{
reader: udpConn,
}
return udp.CopyPacketConn(packetConn, protocolReader, udp.UpdateActivity(timer))
}
responseDoneAndCloseWriter := task.OnSuccess(responseDone, task.Close(link.Writer))
if err := task.Run(ctx, requestDone, responseDoneAndCloseWriter); err != nil {
return newError("connection ends").Base(err)
}
return nil
}
var requestFunc func() error
var responseFunc func() error
if request.Command == protocol.RequestCommandTCP {
requestFunc = func() error {
defer timer.SetTimeout(p.Timeouts.DownlinkOnly)
return buf.Copy(link.Reader, buf.NewWriter(conn), buf.UpdateActivity(timer))
}
responseFunc = func() error {
defer timer.SetTimeout(p.Timeouts.UplinkOnly)
return buf.Copy(buf.NewReader(conn), link.Writer, buf.UpdateActivity(timer))
}
} else if request.Command == protocol.RequestCommandUDP {
udpConn, err := dialer.Dial(ctx, udpRequest.Destination())
if err != nil {
return newError("failed to create UDP connection").Base(err)
}
defer udpConn.Close()
requestFunc = func() error {
defer timer.SetTimeout(p.Timeouts.DownlinkOnly)
return buf.Copy(link.Reader, &buf.SequentialWriter{Writer: NewUDPWriter(request, udpConn)}, buf.UpdateActivity(timer))
}
responseFunc = func() error {
defer timer.SetTimeout(p.Timeouts.UplinkOnly)
reader := &UDPReader{reader: udpConn}
return buf.Copy(reader, link.Writer, buf.UpdateActivity(timer))
}
}
responseDonePost := task.OnSuccess(responseFunc, task.Close(link.Writer))
if err := task.Run(ctx, requestFunc, responseDonePost); err != nil {
return newError("connection ends").Base(err)
}
return nil
}
func init() {
common.Must(common.RegisterConfig((*ClientConfig)(nil), func(ctx context.Context, config interface{}) (interface{}, error) {
return NewClient(ctx, config.(*ClientConfig))
}))
}