-
Notifications
You must be signed in to change notification settings - Fork 1k
/
listener.go
225 lines (197 loc) · 5.93 KB
/
listener.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
package libp2pwebtransport
import (
"context"
"errors"
"fmt"
"net"
"net/http"
"time"
"github.com/libp2p/go-libp2p/core/network"
tpt "github.com/libp2p/go-libp2p/core/transport"
"github.com/libp2p/go-libp2p/p2p/security/noise"
"github.com/libp2p/go-libp2p/p2p/security/noise/pb"
"github.com/libp2p/go-libp2p/p2p/transport/quicreuse"
ma "github.com/multiformats/go-multiaddr"
"github.com/quic-go/webtransport-go"
)
const queueLen = 16
const handshakeTimeout = 10 * time.Second
type listener struct {
transport *transport
isStaticTLSConf bool
reuseListener quicreuse.Listener
server webtransport.Server
ctx context.Context
ctxCancel context.CancelFunc
serverClosed chan struct{} // is closed when server.Serve returns
addr net.Addr
multiaddr ma.Multiaddr
queue chan tpt.CapableConn
}
var _ tpt.Listener = &listener{}
func newListener(reuseListener quicreuse.Listener, t *transport, isStaticTLSConf bool) (tpt.Listener, error) {
localMultiaddr, err := toWebtransportMultiaddr(reuseListener.Addr())
if err != nil {
return nil, err
}
ln := &listener{
reuseListener: reuseListener,
transport: t,
isStaticTLSConf: isStaticTLSConf,
queue: make(chan tpt.CapableConn, queueLen),
serverClosed: make(chan struct{}),
addr: reuseListener.Addr(),
multiaddr: localMultiaddr,
server: webtransport.Server{
CheckOrigin: func(r *http.Request) bool { return true },
},
}
ln.ctx, ln.ctxCancel = context.WithCancel(context.Background())
mux := http.NewServeMux()
mux.HandleFunc(webtransportHTTPEndpoint, ln.httpHandler)
ln.server.H3.Handler = mux
go func() {
defer close(ln.serverClosed)
for {
conn, err := ln.reuseListener.Accept(context.Background())
if err != nil {
log.Debugw("serving failed", "addr", ln.Addr(), "error", err)
return
}
go ln.server.ServeQUICConn(conn)
}
}()
return ln, nil
}
func (l *listener) httpHandler(w http.ResponseWriter, r *http.Request) {
typ, ok := r.URL.Query()["type"]
if !ok || len(typ) != 1 || typ[0] != "noise" {
w.WriteHeader(http.StatusBadRequest)
return
}
remoteMultiaddr, err := stringToWebtransportMultiaddr(r.RemoteAddr)
if err != nil {
// This should never happen.
log.Errorw("converting remote address failed", "remote", r.RemoteAddr, "error", err)
w.WriteHeader(http.StatusBadRequest)
return
}
if l.transport.gater != nil && !l.transport.gater.InterceptAccept(&connMultiaddrs{local: l.multiaddr, remote: remoteMultiaddr}) {
w.WriteHeader(http.StatusForbidden)
return
}
connScope, err := l.transport.rcmgr.OpenConnection(network.DirInbound, false, remoteMultiaddr)
if err != nil {
log.Debugw("resource manager blocked incoming connection", "addr", r.RemoteAddr, "error", err)
w.WriteHeader(http.StatusServiceUnavailable)
return
}
err = l.httpHandlerWithConnScope(w, r, connScope)
if err != nil {
connScope.Done()
}
}
func (l *listener) httpHandlerWithConnScope(w http.ResponseWriter, r *http.Request, connScope network.ConnManagementScope) error {
sess, err := l.server.Upgrade(w, r)
if err != nil {
log.Debugw("upgrade failed", "error", err)
// TODO: think about the status code to use here
w.WriteHeader(500)
return err
}
ctx, cancel := context.WithTimeout(l.ctx, handshakeTimeout)
sconn, err := l.handshake(ctx, sess)
if err != nil {
cancel()
log.Debugw("handshake failed", "error", err)
sess.CloseWithError(1, "")
return err
}
cancel()
if l.transport.gater != nil && !l.transport.gater.InterceptSecured(network.DirInbound, sconn.RemotePeer(), sconn) {
// TODO: can we close with a specific error here?
sess.CloseWithError(errorCodeConnectionGating, "")
return errors.New("gater blocked connection")
}
if err := connScope.SetPeer(sconn.RemotePeer()); err != nil {
log.Debugw("resource manager blocked incoming connection for peer", "peer", sconn.RemotePeer(), "addr", r.RemoteAddr, "error", err)
sess.CloseWithError(1, "")
return err
}
conn := newConn(l.transport, sess, sconn, connScope)
l.transport.addConn(sess, conn)
select {
case l.queue <- conn:
default:
log.Debugw("accept queue full, dropping incoming connection", "peer", sconn.RemotePeer(), "addr", r.RemoteAddr, "error", err)
sess.CloseWithError(1, "")
return errors.New("accept queue full")
}
return nil
}
func (l *listener) Accept() (tpt.CapableConn, error) {
select {
case <-l.ctx.Done():
return nil, tpt.ErrListenerClosed
case c := <-l.queue:
return c, nil
}
}
func (l *listener) handshake(ctx context.Context, sess *webtransport.Session) (*connSecurityMultiaddrs, error) {
local, err := toWebtransportMultiaddr(sess.LocalAddr())
if err != nil {
return nil, fmt.Errorf("error determiniting local addr: %w", err)
}
remote, err := toWebtransportMultiaddr(sess.RemoteAddr())
if err != nil {
return nil, fmt.Errorf("error determiniting remote addr: %w", err)
}
str, err := sess.AcceptStream(ctx)
if err != nil {
return nil, err
}
var earlyData [][]byte
if !l.isStaticTLSConf {
earlyData = l.transport.certManager.SerializedCertHashes()
}
n, err := l.transport.noise.WithSessionOptions(noise.EarlyData(
nil,
newEarlyDataSender(&pb.NoiseExtensions{WebtransportCerthashes: earlyData}),
))
if err != nil {
return nil, fmt.Errorf("failed to initialize Noise session: %w", err)
}
c, err := n.SecureInbound(ctx, &webtransportStream{Stream: str, wsess: sess}, "")
if err != nil {
return nil, err
}
return &connSecurityMultiaddrs{
ConnSecurity: c,
ConnMultiaddrs: &connMultiaddrs{local: local, remote: remote},
}, nil
}
func (l *listener) Addr() net.Addr {
return l.addr
}
func (l *listener) Multiaddr() ma.Multiaddr {
if l.transport.certManager == nil {
return l.multiaddr
}
return l.multiaddr.Encapsulate(l.transport.certManager.AddrComponent())
}
func (l *listener) Close() error {
l.ctxCancel()
l.reuseListener.Close()
err := l.server.Close()
<-l.serverClosed
loop:
for {
select {
case conn := <-l.queue:
conn.Close()
default:
break loop
}
}
return err
}