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
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
|
// Copyright 2009 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.
// +build darwin freebsd linux netbsd openbsd windows
// Unix domain sockets
package net
import (
"os"
"syscall"
"time"
)
func unixSocket(net string, laddr, raddr *UnixAddr, mode string) (fd *netFD, err error) {
var sotype int
switch net {
default:
return nil, UnknownNetworkError(net)
case "unix":
sotype = syscall.SOCK_STREAM
case "unixgram":
sotype = syscall.SOCK_DGRAM
case "unixpacket":
sotype = syscall.SOCK_SEQPACKET
}
var la, ra syscall.Sockaddr
switch mode {
default:
panic("unixSocket mode " + mode)
case "dial":
if laddr != nil {
la = &syscall.SockaddrUnix{Name: laddr.Name}
}
if raddr != nil {
ra = &syscall.SockaddrUnix{Name: raddr.Name}
} else if sotype != syscall.SOCK_DGRAM || laddr == nil {
return nil, &OpError{Op: mode, Net: net, Err: errMissingAddress}
}
case "listen":
if laddr == nil {
return nil, &OpError{mode, net, nil, errMissingAddress}
}
la = &syscall.SockaddrUnix{Name: laddr.Name}
if raddr != nil {
return nil, &OpError{Op: mode, Net: net, Addr: raddr, Err: &AddrError{Err: "unexpected remote address", Addr: raddr.String()}}
}
}
f := sockaddrToUnix
if sotype == syscall.SOCK_DGRAM {
f = sockaddrToUnixgram
} else if sotype == syscall.SOCK_SEQPACKET {
f = sockaddrToUnixpacket
}
fd, oserr := socket(net, syscall.AF_UNIX, sotype, 0, la, ra, f)
if oserr != nil {
goto Error
}
return fd, nil
Error:
addr := raddr
if mode == "listen" {
addr = laddr
}
return nil, &OpError{Op: mode, Net: net, Addr: addr, Err: oserr}
}
func sockaddrToUnix(sa syscall.Sockaddr) Addr {
if s, ok := sa.(*syscall.SockaddrUnix); ok {
return &UnixAddr{s.Name, "unix"}
}
return nil
}
func sockaddrToUnixgram(sa syscall.Sockaddr) Addr {
if s, ok := sa.(*syscall.SockaddrUnix); ok {
return &UnixAddr{s.Name, "unixgram"}
}
return nil
}
func sockaddrToUnixpacket(sa syscall.Sockaddr) Addr {
if s, ok := sa.(*syscall.SockaddrUnix); ok {
return &UnixAddr{s.Name, "unixpacket"}
}
return nil
}
func sotypeToNet(sotype int) string {
switch sotype {
case syscall.SOCK_STREAM:
return "unix"
case syscall.SOCK_SEQPACKET:
return "unixpacket"
case syscall.SOCK_DGRAM:
return "unixgram"
default:
panic("sotypeToNet unknown socket type")
}
return ""
}
// UnixConn is an implementation of the Conn interface
// for connections to Unix domain sockets.
type UnixConn struct {
fd *netFD
}
func newUnixConn(fd *netFD) *UnixConn { return &UnixConn{fd} }
func (c *UnixConn) ok() bool { return c != nil && c.fd != nil }
// Implementation of the Conn interface - see Conn for documentation.
// Read implements the net.Conn Read method.
func (c *UnixConn) Read(b []byte) (n int, err error) {
if !c.ok() {
return 0, os.EINVAL
}
return c.fd.Read(b)
}
// Write implements the net.Conn Write method.
func (c *UnixConn) Write(b []byte) (n int, err error) {
if !c.ok() {
return 0, os.EINVAL
}
return c.fd.Write(b)
}
// Close closes the Unix domain connection.
func (c *UnixConn) Close() error {
if !c.ok() {
return os.EINVAL
}
err := c.fd.Close()
c.fd = nil
return err
}
// LocalAddr returns the local network address, a *UnixAddr.
// Unlike in other protocols, LocalAddr is usually nil for dialed connections.
func (c *UnixConn) LocalAddr() Addr {
if !c.ok() {
return nil
}
return c.fd.laddr
}
// RemoteAddr returns the remote network address, a *UnixAddr.
// Unlike in other protocols, RemoteAddr is usually nil for connections
// accepted by a listener.
func (c *UnixConn) RemoteAddr() Addr {
if !c.ok() {
return nil
}
return c.fd.raddr
}
// SetDeadline implements the net.Conn SetDeadline method.
func (c *UnixConn) SetDeadline(t time.Time) error {
if !c.ok() {
return os.EINVAL
}
return setDeadline(c.fd, t)
}
// SetReadDeadline implements the net.Conn SetReadDeadline method.
func (c *UnixConn) SetReadDeadline(t time.Time) error {
if !c.ok() {
return os.EINVAL
}
return setReadDeadline(c.fd, t)
}
// SetWriteDeadline implements the net.Conn SetWriteDeadline method.
func (c *UnixConn) SetWriteDeadline(t time.Time) error {
if !c.ok() {
return os.EINVAL
}
return setWriteDeadline(c.fd, t)
}
// SetReadBuffer sets the size of the operating system's
// receive buffer associated with the connection.
func (c *UnixConn) SetReadBuffer(bytes int) error {
if !c.ok() {
return os.EINVAL
}
return setReadBuffer(c.fd, bytes)
}
// SetWriteBuffer sets the size of the operating system's
// transmit buffer associated with the connection.
func (c *UnixConn) SetWriteBuffer(bytes int) error {
if !c.ok() {
return os.EINVAL
}
return setWriteBuffer(c.fd, bytes)
}
// ReadFromUnix reads a packet from c, copying the payload into b.
// It returns the number of bytes copied into b and the return address
// that was on the packet.
//
// ReadFromUnix can be made to time out and return
// an error with Timeout() == true after a fixed time limit;
// see SetDeadline and SetReadDeadline.
func (c *UnixConn) ReadFromUnix(b []byte) (n int, addr *UnixAddr, err error) {
if !c.ok() {
return 0, nil, os.EINVAL
}
n, sa, err := c.fd.ReadFrom(b)
switch sa := sa.(type) {
case *syscall.SockaddrUnix:
addr = &UnixAddr{sa.Name, sotypeToNet(c.fd.sotype)}
}
return
}
// ReadFrom implements the net.PacketConn ReadFrom method.
func (c *UnixConn) ReadFrom(b []byte) (n int, addr Addr, err error) {
if !c.ok() {
return 0, nil, os.EINVAL
}
n, uaddr, err := c.ReadFromUnix(b)
return n, uaddr.toAddr(), err
}
// WriteToUnix writes a packet to addr via c, copying the payload from b.
//
// WriteToUnix can be made to time out and return
// an error with Timeout() == true after a fixed time limit;
// see SetDeadline and SetWriteDeadline.
// On packet-oriented connections, write timeouts are rare.
func (c *UnixConn) WriteToUnix(b []byte, addr *UnixAddr) (n int, err error) {
if !c.ok() {
return 0, os.EINVAL
}
if addr.Net != sotypeToNet(c.fd.sotype) {
return 0, os.EAFNOSUPPORT
}
sa := &syscall.SockaddrUnix{Name: addr.Name}
return c.fd.WriteTo(b, sa)
}
// WriteTo implements the net.PacketConn WriteTo method.
func (c *UnixConn) WriteTo(b []byte, addr Addr) (n int, err error) {
if !c.ok() {
return 0, os.EINVAL
}
a, ok := addr.(*UnixAddr)
if !ok {
return 0, &OpError{"writeto", "unix", addr, os.EINVAL}
}
return c.WriteToUnix(b, a)
}
func (c *UnixConn) ReadMsgUnix(b, oob []byte) (n, oobn, flags int, addr *UnixAddr, err error) {
if !c.ok() {
return 0, 0, 0, nil, os.EINVAL
}
n, oobn, flags, sa, err := c.fd.ReadMsg(b, oob)
switch sa := sa.(type) {
case *syscall.SockaddrUnix:
addr = &UnixAddr{sa.Name, sotypeToNet(c.fd.sotype)}
}
return
}
func (c *UnixConn) WriteMsgUnix(b, oob []byte, addr *UnixAddr) (n, oobn int, err error) {
if !c.ok() {
return 0, 0, os.EINVAL
}
if addr != nil {
if addr.Net != sotypeToNet(c.fd.sotype) {
return 0, 0, os.EAFNOSUPPORT
}
sa := &syscall.SockaddrUnix{Name: addr.Name}
return c.fd.WriteMsg(b, oob, sa)
}
return c.fd.WriteMsg(b, oob, nil)
}
// File returns a copy of the underlying os.File, set to blocking mode.
// It is the caller's responsibility to close f when finished.
// Closing c does not affect f, and closing f does not affect c.
func (c *UnixConn) File() (f *os.File, err error) { return c.fd.dup() }
// DialUnix connects to the remote address raddr on the network net,
// which must be "unix" or "unixgram". If laddr is not nil, it is used
// as the local address for the connection.
func DialUnix(net string, laddr, raddr *UnixAddr) (c *UnixConn, err error) {
fd, e := unixSocket(net, laddr, raddr, "dial")
if e != nil {
return nil, e
}
return newUnixConn(fd), nil
}
// UnixListener is a Unix domain socket listener.
// Clients should typically use variables of type Listener
// instead of assuming Unix domain sockets.
type UnixListener struct {
fd *netFD
path string
}
// ListenUnix announces on the Unix domain socket laddr and returns a Unix listener.
// Net must be "unix" (stream sockets).
func ListenUnix(net string, laddr *UnixAddr) (*UnixListener, error) {
if net != "unix" && net != "unixgram" && net != "unixpacket" {
return nil, UnknownNetworkError(net)
}
if laddr != nil {
laddr = &UnixAddr{laddr.Name, net} // make our own copy
}
fd, err := unixSocket(net, laddr, nil, "listen")
if err != nil {
return nil, err
}
err = syscall.Listen(fd.sysfd, listenerBacklog)
if err != nil {
closesocket(fd.sysfd)
return nil, &OpError{Op: "listen", Net: "unix", Addr: laddr, Err: err}
}
return &UnixListener{fd, laddr.Name}, nil
}
// AcceptUnix accepts the next incoming call and returns the new connection
// and the remote address.
func (l *UnixListener) AcceptUnix() (c *UnixConn, err error) {
if l == nil || l.fd == nil {
return nil, os.EINVAL
}
fd, e := l.fd.accept(sockaddrToUnix)
if e != nil {
return nil, e
}
c = newUnixConn(fd)
return c, nil
}
// Accept implements the Accept method in the Listener interface;
// it waits for the next call and returns a generic Conn.
func (l *UnixListener) Accept() (c Conn, err error) {
c1, err := l.AcceptUnix()
if err != nil {
return nil, err
}
return c1, nil
}
// Close stops listening on the Unix address.
// Already accepted connections are not closed.
func (l *UnixListener) Close() error {
if l == nil || l.fd == nil {
return os.EINVAL
}
// The operating system doesn't clean up
// the file that announcing created, so
// we have to clean it up ourselves.
// There's a race here--we can't know for
// sure whether someone else has come along
// and replaced our socket name already--
// but this sequence (remove then close)
// is at least compatible with the auto-remove
// sequence in ListenUnix. It's only non-Go
// programs that can mess us up.
if l.path[0] != '@' {
syscall.Unlink(l.path)
}
err := l.fd.Close()
l.fd = nil
return err
}
// Addr returns the listener's network address.
func (l *UnixListener) Addr() Addr { return l.fd.laddr }
// SetDeadline sets the deadline associated with the listener.
// A zero time value disables the deadline.
func (l *UnixListener) SetDeadline(t time.Time) (err error) {
if l == nil || l.fd == nil {
return os.EINVAL
}
return setDeadline(l.fd, t)
}
// File returns a copy of the underlying os.File, set to blocking mode.
// It is the caller's responsibility to close f when finished.
// Closing c does not affect f, and closing f does not affect c.
func (l *UnixListener) File() (f *os.File, err error) { return l.fd.dup() }
// ListenUnixgram listens for incoming Unix datagram packets addressed to the
// local address laddr. The returned connection c's ReadFrom
// and WriteTo methods can be used to receive and send UDP
// packets with per-packet addressing. The network net must be "unixgram".
func ListenUnixgram(net string, laddr *UnixAddr) (c *UDPConn, err error) {
switch net {
case "unixgram":
default:
return nil, UnknownNetworkError(net)
}
if laddr == nil {
return nil, &OpError{"listen", "unixgram", nil, errMissingAddress}
}
fd, e := unixSocket(net, laddr, nil, "listen")
if e != nil {
return nil, e
}
return newUDPConn(fd), nil
}
|