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
|
// 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.
// Package socktest provides utilities for socket testing.
package socktest
import (
"fmt"
"sync"
)
// A Switch represents a callpath point switch for socket system
// calls.
type Switch struct {
once sync.Once
fmu sync.RWMutex
fltab map[FilterType]Filter
smu sync.RWMutex
sotab Sockets
stats stats
}
func (sw *Switch) init() {
sw.fltab = make(map[FilterType]Filter)
sw.sotab = make(Sockets)
sw.stats = make(stats)
}
// Stats returns a list of per-cookie socket statistics.
func (sw *Switch) Stats() []Stat {
var st []Stat
sw.smu.RLock()
for _, s := range sw.stats {
ns := *s
st = append(st, ns)
}
sw.smu.RUnlock()
return st
}
// Sockets returns mappings of socket descriptor to socket status.
func (sw *Switch) Sockets() Sockets {
sw.smu.RLock()
tab := make(Sockets, len(sw.sotab))
for i, s := range sw.sotab {
tab[i] = s
}
sw.smu.RUnlock()
return tab
}
// A Cookie represents a 3-tuple of a socket; address family, socket
// type and protocol number.
type Cookie uint64
// Family returns an address family.
func (c Cookie) Family() int { return int(c >> 48) }
// Type returns a socket type.
func (c Cookie) Type() int { return int(c << 16 >> 32) }
// Protocol returns a protocol number.
func (c Cookie) Protocol() int { return int(c & 0xff) }
func cookie(family, sotype, proto int) Cookie {
return Cookie(family)<<48 | Cookie(sotype)&0xffffffff<<16 | Cookie(proto)&0xff
}
// A Status represents the status of a socket.
type Status struct {
Cookie Cookie
Err error // error status of socket system call
SocketErr error // error status of socket by SO_ERROR
}
func (so Status) String() string {
return fmt.Sprintf("(%s, %s, %s): syscallerr=%v, socketerr=%v", familyString(so.Cookie.Family()), typeString(so.Cookie.Type()), protocolString(so.Cookie.Protocol()), so.Err, so.SocketErr)
}
// A Stat represents a per-cookie socket statistics.
type Stat struct {
Family int // address family
Type int // socket type
Protocol int // protocol number
Opened uint64 // number of sockets opened
Connected uint64 // number of sockets connected
Listened uint64 // number of sockets listened
Accepted uint64 // number of sockets accepted
Closed uint64 // number of sockets closed
OpenFailed uint64 // number of sockets open failed
ConnectFailed uint64 // number of sockets connect failed
ListenFailed uint64 // number of sockets listen failed
AcceptFailed uint64 // number of sockets accept failed
CloseFailed uint64 // number of sockets close failed
}
func (st Stat) String() string {
return fmt.Sprintf("(%s, %s, %s): opened=%d, connected=%d, listened=%d, accepted=%d, closed=%d, openfailed=%d, connectfailed=%d, listenfailed=%d, acceptfailed=%d, closefailed=%d", familyString(st.Family), typeString(st.Type), protocolString(st.Protocol), st.Opened, st.Connected, st.Listened, st.Accepted, st.Closed, st.OpenFailed, st.ConnectFailed, st.ListenFailed, st.AcceptFailed, st.CloseFailed)
}
type stats map[Cookie]*Stat
func (st stats) getLocked(c Cookie) *Stat {
s, ok := st[c]
if !ok {
s = &Stat{Family: c.Family(), Type: c.Type(), Protocol: c.Protocol()}
st[c] = s
}
return s
}
// A FilterType represents a filter type.
type FilterType int
const (
FilterSocket FilterType = iota // for Socket
FilterConnect // for Connect or ConnectEx
FilterListen // for Listen
FilterAccept // for Accept or Accept4
FilterGetsockoptInt // for GetsockoptInt
FilterClose // for Close or Closesocket
)
// A Filter represents a socket system call filter.
//
// It will only be executed before a system call for a socket that has
// an entry in internal table.
// If the filter returns a non-nil error, the execution of system call
// will be canceled and the system call function returns the non-nil
// error.
// It can return a non-nil AfterFilter for filtering after the
// execution of the system call.
type Filter func(*Status) (AfterFilter, error)
func (f Filter) apply(st *Status) (AfterFilter, error) {
if f == nil {
return nil, nil
}
return f(st)
}
// An AfterFilter represents a socket system call filter after an
// execution of a system call.
//
// It will only be executed after a system call for a socket that has
// an entry in internal table.
// If the filter returns a non-nil error, the system call function
// returns the non-nil error.
type AfterFilter func(*Status) error
func (f AfterFilter) apply(st *Status) error {
if f == nil {
return nil
}
return f(st)
}
// Set deploys the socket system call filter f for the filter type t.
func (sw *Switch) Set(t FilterType, f Filter) {
sw.once.Do(sw.init)
sw.fmu.Lock()
sw.fltab[t] = f
sw.fmu.Unlock()
}
|
