-
Notifications
You must be signed in to change notification settings - Fork 0
/
socket.go
195 lines (163 loc) · 4.25 KB
/
socket.go
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
// Copyright (c) 2012-2014 Jeremy Latt
// Copyright (c) 2016- Daniel Oaks <daniel@danieloaks.net>
// released under the MIT license
package irc
import (
"bufio"
"crypto/sha256"
"crypto/tls"
"encoding/hex"
"errors"
"fmt"
"io"
"net"
"strings"
"sync"
"time"
)
var (
errNotTLS = errors.New("Not a TLS connection")
errNoPeerCerts = errors.New("Client did not provide a certificate")
handshakeTimeout, _ = time.ParseDuration("5s")
)
// Socket represents an IRC socket.
type Socket struct {
Closed bool
conn net.Conn
reader *bufio.Reader
MaxSendQBytes uint64
lineToSendExists chan bool
linesToSend []string
linesToSendMutex sync.Mutex
}
// NewSocket returns a new Socket.
func NewSocket(conn net.Conn, maxSendQBytes uint64) Socket {
return Socket{
conn: conn,
reader: bufio.NewReader(conn),
MaxSendQBytes: maxSendQBytes,
lineToSendExists: make(chan bool),
}
}
// Close stops a Socket from being able to send/receive any more data.
func (socket *Socket) Close() {
socket.Closed = true
// 'send data' to force close loop to happen
socket.linesToSendMutex.Lock()
socket.linesToSend = append(socket.linesToSend, "")
socket.linesToSendMutex.Unlock()
go socket.fillLineToSendExists()
}
// CertFP returns the fingerprint of the certificate provided by the client.
func (socket *Socket) CertFP() (string, error) {
var tlsConn, isTLS = socket.conn.(*tls.Conn)
if !isTLS {
return "", errNotTLS
}
// ensure handehake is performed, and timeout after a few seconds
tlsConn.SetDeadline(time.Now().Add(handshakeTimeout))
err := tlsConn.Handshake()
tlsConn.SetDeadline(time.Time{})
if err != nil {
return "", err
}
peerCerts := tlsConn.ConnectionState().PeerCertificates
if len(peerCerts) < 1 {
return "", errNoPeerCerts
}
rawCert := sha256.Sum256(peerCerts[0].Raw)
fingerprint := hex.EncodeToString(rawCert[:])
return fingerprint, nil
}
// Read returns a single IRC line from a Socket.
func (socket *Socket) Read() (string, error) {
if socket.Closed {
return "", io.EOF
}
lineBytes, err := socket.reader.ReadBytes('\n')
// convert bytes to string
line := string(lineBytes[:])
// read last message properly (such as ERROR/QUIT/etc), just fail next reads/writes
if err == io.EOF {
socket.Close()
}
if err == io.EOF && strings.TrimSpace(line) != "" {
// don't do anything
} else if err != nil {
return "", err
}
return strings.TrimRight(line, "\r\n"), nil
}
// Write sends the given string out of Socket.
func (socket *Socket) Write(data string) error {
if socket.Closed {
return io.EOF
}
socket.linesToSendMutex.Lock()
socket.linesToSend = append(socket.linesToSend, data)
socket.linesToSendMutex.Unlock()
go socket.fillLineToSendExists()
return nil
}
// fillLineToSendExists only exists because you can't goroutine single statements.
func (socket *Socket) fillLineToSendExists() {
socket.lineToSendExists <- true
}
// RunSocketWriter starts writing messages to the outgoing socket.
func (socket *Socket) RunSocketWriter() {
var errOut bool
for {
// wait for new lines
select {
case <-socket.lineToSendExists:
socket.linesToSendMutex.Lock()
// check sendq
var sendQBytes uint64
for _, line := range socket.linesToSend {
sendQBytes += uint64(len(line))
if socket.MaxSendQBytes < sendQBytes {
break
}
}
if socket.MaxSendQBytes < sendQBytes {
socket.conn.Write([]byte("\r\nERROR :SendQ Exceeded\r\n"))
fmt.Println("SendQ exceeded, disconnected client")
break
}
// get data
data := socket.linesToSend[0]
if len(socket.linesToSend) > 1 {
socket.linesToSend = socket.linesToSend[1:]
} else {
socket.linesToSend = []string{}
}
socket.linesToSendMutex.Unlock()
// write data
if 0 < len(data) {
_, err := socket.conn.Write([]byte(data))
if err != nil {
errOut = true
fmt.Println(err.Error())
break
}
}
// check if we're closed
if socket.Closed {
break
}
}
if errOut {
// error out, bad stuff happened
break
}
}
//TODO(dan): empty socket.lineToSendExists queue
socket.conn.Close()
if !socket.Closed {
socket.Closed = true
}
}
// WriteLine writes the given line out of Socket.
func (socket *Socket) WriteLine(line string) error {
return socket.Write(line + "\r\n")
}