-
-
Notifications
You must be signed in to change notification settings - Fork 1
/
trojan.go
234 lines (218 loc) · 7.36 KB
/
trojan.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
231
232
233
234
package inbound
import (
"context"
"net"
"os"
"github.com/kelleygo/sing-box/adapter"
"github.com/kelleygo/sing-box/common/mux"
"github.com/kelleygo/sing-box/common/tls"
C "github.com/kelleygo/sing-box/constant"
"github.com/kelleygo/sing-box/log"
"github.com/kelleygo/sing-box/option"
"github.com/kelleygo/sing-box/transport/trojan"
"github.com/kelleygo/sing-box/transport/v2ray"
"github.com/sagernet/sing/common"
"github.com/sagernet/sing/common/auth"
E "github.com/sagernet/sing/common/exceptions"
F "github.com/sagernet/sing/common/format"
M "github.com/sagernet/sing/common/metadata"
N "github.com/sagernet/sing/common/network"
)
var (
_ adapter.Inbound = (*Trojan)(nil)
_ adapter.InjectableInbound = (*Trojan)(nil)
)
type Trojan struct {
myInboundAdapter
service *trojan.Service[int]
users []option.TrojanUser
tlsConfig tls.ServerConfig
fallbackAddr M.Socksaddr
fallbackAddrTLSNextProto map[string]M.Socksaddr
transport adapter.V2RayServerTransport
}
func NewTrojan(ctx context.Context, router adapter.Router, logger log.ContextLogger, tag string, options option.TrojanInboundOptions) (*Trojan, error) {
inbound := &Trojan{
myInboundAdapter: myInboundAdapter{
protocol: C.TypeTrojan,
network: []string{N.NetworkTCP},
ctx: ctx,
router: router,
logger: logger,
tag: tag,
listenOptions: options.ListenOptions,
},
users: options.Users,
}
if options.TLS != nil {
tlsConfig, err := tls.NewServer(ctx, logger, common.PtrValueOrDefault(options.TLS))
if err != nil {
return nil, err
}
inbound.tlsConfig = tlsConfig
}
var fallbackHandler N.TCPConnectionHandler
if options.Fallback != nil && options.Fallback.Server != "" || len(options.FallbackForALPN) > 0 {
if options.Fallback != nil && options.Fallback.Server != "" {
inbound.fallbackAddr = options.Fallback.Build()
if !inbound.fallbackAddr.IsValid() {
return nil, E.New("invalid fallback address: ", inbound.fallbackAddr)
}
}
if len(options.FallbackForALPN) > 0 {
if inbound.tlsConfig == nil {
return nil, E.New("fallback for ALPN is not supported without TLS")
}
fallbackAddrNextProto := make(map[string]M.Socksaddr)
for nextProto, destination := range options.FallbackForALPN {
fallbackAddr := destination.Build()
if !fallbackAddr.IsValid() {
return nil, E.New("invalid fallback address for ALPN ", nextProto, ": ", fallbackAddr)
}
fallbackAddrNextProto[nextProto] = fallbackAddr
}
inbound.fallbackAddrTLSNextProto = fallbackAddrNextProto
}
fallbackHandler = adapter.NewUpstreamContextHandler(inbound.fallbackConnection, nil, nil)
}
service := trojan.NewService[int](adapter.NewUpstreamContextHandler(inbound.newConnection, inbound.newPacketConnection, inbound), fallbackHandler)
err := service.UpdateUsers(common.MapIndexed(options.Users, func(index int, it option.TrojanUser) int {
return index
}), common.Map(options.Users, func(it option.TrojanUser) string {
return it.Password
}))
if err != nil {
return nil, err
}
if options.Transport != nil {
inbound.transport, err = v2ray.NewServerTransport(ctx, common.PtrValueOrDefault(options.Transport), inbound.tlsConfig, (*trojanTransportHandler)(inbound))
if err != nil {
return nil, E.Cause(err, "create server transport: ", options.Transport.Type)
}
}
inbound.router, err = mux.NewRouterWithOptions(inbound.router, logger, common.PtrValueOrDefault(options.Multiplex))
if err != nil {
return nil, err
}
inbound.service = service
inbound.connHandler = inbound
return inbound, nil
}
func (h *Trojan) Start() error {
if h.tlsConfig != nil {
err := h.tlsConfig.Start()
if err != nil {
return E.Cause(err, "create TLS config")
}
}
if h.transport == nil {
return h.myInboundAdapter.Start()
}
if common.Contains(h.transport.Network(), N.NetworkTCP) {
tcpListener, err := h.myInboundAdapter.ListenTCP()
if err != nil {
return err
}
go func() {
sErr := h.transport.Serve(tcpListener)
if sErr != nil && !E.IsClosed(sErr) {
h.logger.Error("transport serve error: ", sErr)
}
}()
}
if common.Contains(h.transport.Network(), N.NetworkUDP) {
udpConn, err := h.myInboundAdapter.ListenUDP()
if err != nil {
return err
}
go func() {
sErr := h.transport.ServePacket(udpConn)
if sErr != nil && !E.IsClosed(sErr) {
h.logger.Error("transport serve error: ", sErr)
}
}()
}
return nil
}
func (h *Trojan) Close() error {
return common.Close(
&h.myInboundAdapter,
h.tlsConfig,
h.transport,
)
}
func (h *Trojan) newTransportConnection(ctx context.Context, conn net.Conn, metadata adapter.InboundContext) error {
h.injectTCP(conn, metadata)
return nil
}
func (h *Trojan) NewConnection(ctx context.Context, conn net.Conn, metadata adapter.InboundContext) error {
var err error
if h.tlsConfig != nil && h.transport == nil {
conn, err = tls.ServerHandshake(ctx, conn, h.tlsConfig)
if err != nil {
return err
}
}
return h.service.NewConnection(adapter.WithContext(ctx, &metadata), conn, adapter.UpstreamMetadata(metadata))
}
func (h *Trojan) NewPacketConnection(ctx context.Context, conn N.PacketConn, metadata adapter.InboundContext) error {
return os.ErrInvalid
}
func (h *Trojan) newConnection(ctx context.Context, conn net.Conn, metadata adapter.InboundContext) error {
userIndex, loaded := auth.UserFromContext[int](ctx)
if !loaded {
return os.ErrInvalid
}
user := h.users[userIndex].Name
if user == "" {
user = F.ToString(userIndex)
} else {
metadata.User = user
}
h.logger.InfoContext(ctx, "[", user, "] inbound connection to ", metadata.Destination)
return h.router.RouteConnection(ctx, conn, metadata)
}
func (h *Trojan) fallbackConnection(ctx context.Context, conn net.Conn, metadata adapter.InboundContext) error {
var fallbackAddr M.Socksaddr
if len(h.fallbackAddrTLSNextProto) > 0 {
if tlsConn, loaded := common.Cast[tls.Conn](conn); loaded {
connectionState := tlsConn.ConnectionState()
if connectionState.NegotiatedProtocol != "" {
if fallbackAddr, loaded = h.fallbackAddrTLSNextProto[connectionState.NegotiatedProtocol]; !loaded {
return E.New("fallback disabled for ALPN: ", connectionState.NegotiatedProtocol)
}
}
}
}
if !fallbackAddr.IsValid() {
if !h.fallbackAddr.IsValid() {
return E.New("fallback disabled by default")
}
fallbackAddr = h.fallbackAddr
}
h.logger.InfoContext(ctx, "fallback connection to ", fallbackAddr)
metadata.Destination = fallbackAddr
return h.router.RouteConnection(ctx, conn, metadata)
}
func (h *Trojan) newPacketConnection(ctx context.Context, conn N.PacketConn, metadata adapter.InboundContext) error {
userIndex, loaded := auth.UserFromContext[int](ctx)
if !loaded {
return os.ErrInvalid
}
user := h.users[userIndex].Name
if user == "" {
user = F.ToString(userIndex)
} else {
metadata.User = user
}
h.logger.InfoContext(ctx, "[", user, "] inbound packet connection to ", metadata.Destination)
return h.router.RoutePacketConnection(ctx, conn, metadata)
}
var _ adapter.V2RayServerTransportHandler = (*trojanTransportHandler)(nil)
type trojanTransportHandler Trojan
func (t *trojanTransportHandler) NewConnection(ctx context.Context, conn net.Conn, metadata M.Metadata) error {
return (*Trojan)(t).newTransportConnection(ctx, conn, adapter.InboundContext{
Source: metadata.Source,
Destination: metadata.Destination,
})
}