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
|
// Copyright 2010 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.
package net
import (
"context"
"internal/poll"
"os"
"runtime"
"syscall"
"unsafe"
)
const (
readSyscallName = "wsarecv"
readFromSyscallName = "wsarecvfrom"
readMsgSyscallName = "wsarecvmsg"
writeSyscallName = "wsasend"
writeToSyscallName = "wsasendto"
writeMsgSyscallName = "wsasendmsg"
)
// canUseConnectEx reports whether we can use the ConnectEx Windows API call
// for the given network type.
func canUseConnectEx(net string) bool {
switch net {
case "tcp", "tcp4", "tcp6":
return true
}
// ConnectEx windows API does not support connectionless sockets.
return false
}
func newFD(sysfd syscall.Handle, family, sotype int, net string) (*netFD, error) {
ret := &netFD{
pfd: poll.FD{
Sysfd: sysfd,
IsStream: sotype == syscall.SOCK_STREAM,
ZeroReadIsEOF: sotype != syscall.SOCK_DGRAM && sotype != syscall.SOCK_RAW,
},
family: family,
sotype: sotype,
net: net,
}
return ret, nil
}
func (fd *netFD) init() error {
errcall, err := fd.pfd.Init(fd.net, true)
if errcall != "" {
err = wrapSyscallError(errcall, err)
}
return err
}
// Always returns nil for connected peer address result.
func (fd *netFD) connect(ctx context.Context, la, ra syscall.Sockaddr) (syscall.Sockaddr, error) {
// Do not need to call fd.writeLock here,
// because fd is not yet accessible to user,
// so no concurrent operations are possible.
if err := fd.init(); err != nil {
return nil, err
}
if deadline, ok := ctx.Deadline(); ok && !deadline.IsZero() {
fd.pfd.SetWriteDeadline(deadline)
defer fd.pfd.SetWriteDeadline(noDeadline)
}
if !canUseConnectEx(fd.net) {
err := connectFunc(fd.pfd.Sysfd, ra)
return nil, os.NewSyscallError("connect", err)
}
// ConnectEx windows API requires an unconnected, previously bound socket.
if la == nil {
switch ra.(type) {
case *syscall.SockaddrInet4:
la = &syscall.SockaddrInet4{}
case *syscall.SockaddrInet6:
la = &syscall.SockaddrInet6{}
default:
panic("unexpected type in connect")
}
if err := syscall.Bind(fd.pfd.Sysfd, la); err != nil {
return nil, os.NewSyscallError("bind", err)
}
}
// Wait for the goroutine converting context.Done into a write timeout
// to exist, otherwise our caller might cancel the context and
// cause fd.setWriteDeadline(aLongTimeAgo) to cancel a successful dial.
done := make(chan bool) // must be unbuffered
defer func() { done <- true }()
go func() {
select {
case <-ctx.Done():
// Force the runtime's poller to immediately give
// up waiting for writability.
fd.pfd.SetWriteDeadline(aLongTimeAgo)
<-done
case <-done:
}
}()
// Call ConnectEx API.
if err := fd.pfd.ConnectEx(ra); err != nil {
select {
case <-ctx.Done():
return nil, mapErr(ctx.Err())
default:
if _, ok := err.(syscall.Errno); ok {
err = os.NewSyscallError("connectex", err)
}
return nil, err
}
}
// Refresh socket properties.
return nil, os.NewSyscallError("setsockopt", syscall.Setsockopt(fd.pfd.Sysfd, syscall.SOL_SOCKET, syscall.SO_UPDATE_CONNECT_CONTEXT, (*byte)(unsafe.Pointer(&fd.pfd.Sysfd)), int32(unsafe.Sizeof(fd.pfd.Sysfd))))
}
func (c *conn) writeBuffers(v *Buffers) (int64, error) {
if !c.ok() {
return 0, syscall.EINVAL
}
n, err := c.fd.writeBuffers(v)
if err != nil {
return n, &OpError{Op: "wsasend", Net: c.fd.net, Source: c.fd.laddr, Addr: c.fd.raddr, Err: err}
}
return n, nil
}
func (fd *netFD) writeBuffers(buf *Buffers) (int64, error) {
n, err := fd.pfd.Writev((*[][]byte)(buf))
runtime.KeepAlive(fd)
return n, wrapSyscallError("wsasend", err)
}
func (fd *netFD) accept() (*netFD, error) {
s, rawsa, rsan, errcall, err := fd.pfd.Accept(func() (syscall.Handle, error) {
return sysSocket(fd.family, fd.sotype, 0)
})
if err != nil {
if errcall != "" {
err = wrapSyscallError(errcall, err)
}
return nil, err
}
// Associate our new socket with IOCP.
netfd, err := newFD(s, fd.family, fd.sotype, fd.net)
if err != nil {
poll.CloseFunc(s)
return nil, err
}
if err := netfd.init(); err != nil {
fd.Close()
return nil, err
}
// Get local and peer addr out of AcceptEx buffer.
var lrsa, rrsa *syscall.RawSockaddrAny
var llen, rlen int32
syscall.GetAcceptExSockaddrs((*byte)(unsafe.Pointer(&rawsa[0])),
0, rsan, rsan, &lrsa, &llen, &rrsa, &rlen)
lsa, _ := lrsa.Sockaddr()
rsa, _ := rrsa.Sockaddr()
netfd.setAddr(netfd.addrFunc()(lsa), netfd.addrFunc()(rsa))
return netfd, nil
}
// Unimplemented functions.
func (fd *netFD) dup() (*os.File, error) {
// TODO: Implement this
return nil, syscall.EWINDOWS
}
|
