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
|
package xmpp
import (
"crypto/tls"
"crypto/x509"
"encoding/xml"
"log"
"os"
)
type Event uint8
const (
DisconnectEvent Event = iota
ConnectEvent
ShouldDisconnectEvent
)
func Run(rxChan chan Event, txChan chan any, jid string, pwd string) {
conn, err := setupConn(jid)
if err != nil {
log.Print(err)
return
}
defer conn.Close()
decoder := newDecoder(conn)
go decoder.run()
defer decoder.stop()
enc := xml.NewEncoder(conn)
defer enc.Close()
dbg := xml.NewEncoder(os.Stdout)
defer dbg.Close()
end := sendStreamStart(enc, dbg, jid)
defer sendStreamEnd(enc, dbg, end)
txChan <- ConnectEvent
defer func() { txChan <- DisconnectEvent }()
for {
select {
case ev := <-rxChan:
switch ev {
case ShouldDisconnectEvent:
return
default:
log.Printf("Unknown Event '%d'!\n", ev)
}
case rx := <-decoder.data:
dbg.Indent("S: ", " ")
dbg.EncodeToken(rx)
dbg.Flush()
}
}
}
func setupConn(jid string) (*tls.Conn, error) {
domain := domainpart(jid)
roots, err := x509.SystemCertPool()
if err != nil {
return nil, err
}
return tls.Dial("tcp", domain+":"+"5223", &tls.Config{RootCAs: roots})
}
func sendStreamStart(enc *xml.Encoder, dbg *xml.Encoder, jid string) xml.EndElement {
start := xml.StartElement{
xml.Name{"jabber:client", "stream:stream"},
[]xml.Attr{
xml.Attr{xml.Name{"", "from"}, jid},
xml.Attr{xml.Name{"", "to"}, domainpart(jid)},
xml.Attr{xml.Name{"", "version"}, "1.0"},
xml.Attr{xml.Name{"", "xml:lang"}, "en"},
xml.Attr{xml.Name{"", "xmlns:stream"}, "http://etherx.jabber.org/streams"},
},
}
err := enc.EncodeToken(start)
if err != nil {
log.Println("Could not encode stream start to TCP channel!")
}
err = enc.Flush()
if err != nil {
log.Println("Could not flush TCP channel XML encoder!")
}
dbg.Indent("C: ", " ")
err = dbg.EncodeToken(start)
if err != nil {
log.Println("Could not encode stream start to debug output!")
}
err = dbg.Flush()
if err != nil {
log.Println("Could not flush debug XML encoder!")
}
return start.End()
}
func sendStreamEnd(enc *xml.Encoder, dbg *xml.Encoder, end xml.EndElement) {
err := enc.EncodeToken(end)
if err != nil {
log.Println("Could not encode stream end to TCP channel!")
}
err = enc.Flush()
if err != nil {
log.Println("Could not flush TCP channel XML encoder!")
}
dbg.Indent("C: ", " ")
err = dbg.EncodeToken(end)
if err != nil {
log.Println("Could not encode stream end to debug output!")
}
err = dbg.Flush()
if err != nil {
log.Println("Could not flush debug XML encoder!")
}
}
// domainpart extracts the domain name from a JID / XMPP address. See
// https://datatracker.ietf.org/doc/html/rfc7622#section-3.2 for details.
func domainpart(jid string) string {
list := []rune(jid)
for i, v := range list {
if v == '/' {
list = list[:i]
break
}
}
for i, v := range list {
if v == '@' {
list = list[i+1:]
break
}
}
return string(list)
}
|
