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
// Copyright 2015 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 dragonfly freebsd linux nacl netbsd openbsd solaris
package socktest
import "syscall"
// Socket wraps syscall.Socket.
func (sw *Switch) Socket(family, sotype, proto int) (s int, err error) {
so := &Status{Cookie: cookie(family, sotype, proto)}
sw.fmu.RLock()
f, _ := sw.fltab[FilterSocket]
sw.fmu.RUnlock()
af, err := f.apply(so)
if err != nil {
return -1, err
}
s, so.Err = syscall.Socket(family, sotype, proto)
if err = af.apply(so); err != nil {
if so.Err == nil {
syscall.Close(s)
}
return -1, err
}
if so.Err != nil {
return -1, so.Err
}
sw.smu.Lock()
nso := sw.addLocked(s, family, sotype, proto)
sw.stats.getLocked(nso.Cookie).Opened++
sw.smu.Unlock()
return s, nil
}
// Close wraps syscall.Close.
func (sw *Switch) Close(s int) (err error) {
so := sw.sockso(s)
if so == nil {
return syscall.Close(s)
}
sw.fmu.RLock()
f, _ := sw.fltab[FilterClose]
sw.fmu.RUnlock()
af, err := f.apply(so)
if err != nil {
return err
}
so.Err = syscall.Close(s)
if err = af.apply(so); err != nil {
return err
}
if so.Err != nil {
return so.Err
}
sw.smu.Lock()
delete(sw.sotab, s)
sw.stats.getLocked(so.Cookie).Closed++
sw.smu.Unlock()
return nil
}
// Connect wraps syscall.Connect.
func (sw *Switch) Connect(s int, sa syscall.Sockaddr) (err error) {
so := sw.sockso(s)
if so == nil {
return syscall.Connect(s, sa)
}
sw.fmu.RLock()
f, _ := sw.fltab[FilterConnect]
sw.fmu.RUnlock()
af, err := f.apply(so)
if err != nil {
return err
}
so.Err = syscall.Connect(s, sa)
if err = af.apply(so); err != nil {
return err
}
if so.Err != nil {
return so.Err
}
sw.smu.Lock()
sw.stats.getLocked(so.Cookie).Connected++
sw.smu.Unlock()
return nil
}
// Accept wraps syscall.Accept.
func (sw *Switch) Accept(s int) (ns int, sa syscall.Sockaddr, err error) {
so := sw.sockso(s)
if so == nil {
return syscall.Accept(s)
}
sw.fmu.RLock()
f, _ := sw.fltab[FilterAccept]
sw.fmu.RUnlock()
af, err := f.apply(so)
if err != nil {
return -1, nil, err
}
ns, sa, so.Err = syscall.Accept(s)
if err = af.apply(so); err != nil {
if so.Err == nil {
syscall.Close(ns)
}
return -1, nil, err
}
if so.Err != nil {
return -1, nil, so.Err
}
sw.smu.Lock()
nso := sw.addLocked(ns, so.Cookie.Family(), so.Cookie.Type(), so.Cookie.Protocol())
sw.stats.getLocked(nso.Cookie).Accepted++
sw.smu.Unlock()
return ns, sa, nil
}
// GetsockoptInt wraps syscall.GetsockoptInt.
func (sw *Switch) GetsockoptInt(s, level, opt int) (soerr int, err error) {
so := sw.sockso(s)
if so == nil {
return syscall.GetsockoptInt(s, level, opt)
}
sw.fmu.RLock()
f, _ := sw.fltab[FilterGetsockoptInt]
sw.fmu.RUnlock()
af, err := f.apply(so)
if err != nil {
return -1, err
}
so.SocketErr, so.Err = syscall.GetsockoptInt(s, level, opt)
if err = af.apply(so); err != nil {
return -1, err
}
if so.Err != nil {
return -1, so.Err
}
if opt == syscall.SO_ERROR && (so.SocketErr == 0 || syscall.Errno(so.SocketErr) == syscall.EISCONN) {
sw.smu.Lock()
sw.stats.getLocked(so.Cookie).Connected++
sw.smu.Unlock()
}
return so.SocketErr, nil
}