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
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
|
// Copyright 2018 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
// Fake networking for js/wasm. It is intended to allow tests of other package to pass.
//go:build js && wasm
package net
import (
"context"
"internal/poll"
"io"
"os"
"sync"
"syscall"
"time"
"golang.org/x/net/dns/dnsmessage"
)
var listenersMu sync.Mutex
var listeners = make(map[string]*netFD)
var portCounterMu sync.Mutex
var portCounter = 0
func nextPort() int {
portCounterMu.Lock()
defer portCounterMu.Unlock()
portCounter++
return portCounter
}
// Network file descriptor.
type netFD struct {
r *bufferedPipe
w *bufferedPipe
incoming chan *netFD
closedMu sync.Mutex
closed bool
// immutable until Close
listener bool
family int
sotype int
net string
laddr Addr
raddr Addr
// unused
pfd poll.FD
isConnected bool // handshake completed or use of association with peer
}
// socket returns a network file descriptor that is ready for
// asynchronous I/O using the network poller.
func socket(ctx context.Context, net string, family, sotype, proto int, ipv6only bool, laddr, raddr sockaddr, ctrlCtxFn func(context.Context, string, string, syscall.RawConn) error) (*netFD, error) {
fd := &netFD{family: family, sotype: sotype, net: net}
if laddr != nil && raddr == nil { // listener
l := laddr.(*TCPAddr)
fd.laddr = &TCPAddr{
IP: l.IP,
Port: nextPort(),
Zone: l.Zone,
}
fd.listener = true
fd.incoming = make(chan *netFD, 1024)
listenersMu.Lock()
listeners[fd.laddr.(*TCPAddr).String()] = fd
listenersMu.Unlock()
return fd, nil
}
fd.laddr = &TCPAddr{
IP: IPv4(127, 0, 0, 1),
Port: nextPort(),
}
fd.raddr = raddr
fd.r = newBufferedPipe(65536)
fd.w = newBufferedPipe(65536)
fd2 := &netFD{family: fd.family, sotype: sotype, net: net}
fd2.laddr = fd.raddr
fd2.raddr = fd.laddr
fd2.r = fd.w
fd2.w = fd.r
listenersMu.Lock()
l, ok := listeners[fd.raddr.(*TCPAddr).String()]
if !ok {
listenersMu.Unlock()
return nil, syscall.ECONNREFUSED
}
l.incoming <- fd2
listenersMu.Unlock()
return fd, nil
}
func (fd *netFD) Read(p []byte) (n int, err error) {
return fd.r.Read(p)
}
func (fd *netFD) Write(p []byte) (nn int, err error) {
return fd.w.Write(p)
}
func (fd *netFD) Close() error {
fd.closedMu.Lock()
if fd.closed {
fd.closedMu.Unlock()
return nil
}
fd.closed = true
fd.closedMu.Unlock()
if fd.listener {
listenersMu.Lock()
delete(listeners, fd.laddr.String())
close(fd.incoming)
fd.listener = false
listenersMu.Unlock()
return nil
}
fd.r.Close()
fd.w.Close()
return nil
}
func (fd *netFD) closeRead() error {
fd.r.Close()
return nil
}
func (fd *netFD) closeWrite() error {
fd.w.Close()
return nil
}
func (fd *netFD) accept() (*netFD, error) {
c, ok := <-fd.incoming
if !ok {
return nil, syscall.EINVAL
}
return c, nil
}
func (fd *netFD) SetDeadline(t time.Time) error {
fd.r.SetReadDeadline(t)
fd.w.SetWriteDeadline(t)
return nil
}
func (fd *netFD) SetReadDeadline(t time.Time) error {
fd.r.SetReadDeadline(t)
return nil
}
func (fd *netFD) SetWriteDeadline(t time.Time) error {
fd.w.SetWriteDeadline(t)
return nil
}
func newBufferedPipe(softLimit int) *bufferedPipe {
p := &bufferedPipe{softLimit: softLimit}
p.rCond.L = &p.mu
p.wCond.L = &p.mu
return p
}
type bufferedPipe struct {
softLimit int
mu sync.Mutex
buf []byte
closed bool
rCond sync.Cond
wCond sync.Cond
rDeadline time.Time
wDeadline time.Time
}
func (p *bufferedPipe) Read(b []byte) (int, error) {
p.mu.Lock()
defer p.mu.Unlock()
for {
if p.closed && len(p.buf) == 0 {
return 0, io.EOF
}
if !p.rDeadline.IsZero() {
d := time.Until(p.rDeadline)
if d <= 0 {
return 0, os.ErrDeadlineExceeded
}
time.AfterFunc(d, p.rCond.Broadcast)
}
if len(p.buf) > 0 {
break
}
p.rCond.Wait()
}
n := copy(b, p.buf)
p.buf = p.buf[n:]
p.wCond.Broadcast()
return n, nil
}
func (p *bufferedPipe) Write(b []byte) (int, error) {
p.mu.Lock()
defer p.mu.Unlock()
for {
if p.closed {
return 0, syscall.ENOTCONN
}
if !p.wDeadline.IsZero() {
d := time.Until(p.wDeadline)
if d <= 0 {
return 0, os.ErrDeadlineExceeded
}
time.AfterFunc(d, p.wCond.Broadcast)
}
if len(p.buf) <= p.softLimit {
break
}
p.wCond.Wait()
}
p.buf = append(p.buf, b...)
p.rCond.Broadcast()
return len(b), nil
}
func (p *bufferedPipe) Close() {
p.mu.Lock()
defer p.mu.Unlock()
p.closed = true
p.rCond.Broadcast()
p.wCond.Broadcast()
}
func (p *bufferedPipe) SetReadDeadline(t time.Time) {
p.mu.Lock()
defer p.mu.Unlock()
p.rDeadline = t
p.rCond.Broadcast()
}
func (p *bufferedPipe) SetWriteDeadline(t time.Time) {
p.mu.Lock()
defer p.mu.Unlock()
p.wDeadline = t
p.wCond.Broadcast()
}
func sysSocket(family, sotype, proto int) (int, error) {
return 0, syscall.ENOSYS
}
func (fd *netFD) readFrom(p []byte) (n int, sa syscall.Sockaddr, err error) {
return 0, nil, syscall.ENOSYS
}
func (fd *netFD) readFromInet4(p []byte, sa *syscall.SockaddrInet4) (n int, err error) {
return 0, syscall.ENOSYS
}
func (fd *netFD) readFromInet6(p []byte, sa *syscall.SockaddrInet6) (n int, err error) {
return 0, syscall.ENOSYS
}
func (fd *netFD) readMsg(p []byte, oob []byte, flags int) (n, oobn, retflags int, sa syscall.Sockaddr, err error) {
return 0, 0, 0, nil, syscall.ENOSYS
}
func (fd *netFD) readMsgInet4(p []byte, oob []byte, flags int, sa *syscall.SockaddrInet4) (n, oobn, retflags int, err error) {
return 0, 0, 0, syscall.ENOSYS
}
func (fd *netFD) readMsgInet6(p []byte, oob []byte, flags int, sa *syscall.SockaddrInet6) (n, oobn, retflags int, err error) {
return 0, 0, 0, syscall.ENOSYS
}
func (fd *netFD) writeMsgInet4(p []byte, oob []byte, sa *syscall.SockaddrInet4) (n int, oobn int, err error) {
return 0, 0, syscall.ENOSYS
}
func (fd *netFD) writeMsgInet6(p []byte, oob []byte, sa *syscall.SockaddrInet6) (n int, oobn int, err error) {
return 0, 0, syscall.ENOSYS
}
func (fd *netFD) writeTo(p []byte, sa syscall.Sockaddr) (n int, err error) {
return 0, syscall.ENOSYS
}
func (fd *netFD) writeToInet4(p []byte, sa *syscall.SockaddrInet4) (n int, err error) {
return 0, syscall.ENOSYS
}
func (fd *netFD) writeToInet6(p []byte, sa *syscall.SockaddrInet6) (n int, err error) {
return 0, syscall.ENOSYS
}
func (fd *netFD) writeMsg(p []byte, oob []byte, sa syscall.Sockaddr) (n int, oobn int, err error) {
return 0, 0, syscall.ENOSYS
}
func (fd *netFD) dup() (f *os.File, err error) {
return nil, syscall.ENOSYS
}
func (r *Resolver) lookup(ctx context.Context, name string, qtype dnsmessage.Type, conf *dnsConfig) (dnsmessage.Parser, string, error) {
panic("unreachable")
}
|
