-
Notifications
You must be signed in to change notification settings - Fork 0
/
server.go
79 lines (69 loc) · 1.86 KB
/
server.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
package telnetlib
import (
"fmt"
"io"
"net"
log "github.com/Sirupsen/logrus"
)
type DataHandlerFunc func(w io.Writer, data []byte, tc *TelnetConn)
type CmdHandlerFunc func(w io.Writer, cmd []byte, tc *TelnetConn)
var defaultDataHandlerFunc = func(w io.Writer, data []byte, tc *TelnetConn) {}
var defaultCmdHandlerFunc = func(w io.Writer, cmd []byte, tc *TelnetConn) {}
type TelnetOpts struct {
Addr string
ServerOpts []byte
ClientOpts []byte
DataHandler DataHandlerFunc
CmdHandler CmdHandlerFunc
}
type TelnetServer struct {
ServerOptions map[byte]bool
ClientOptions map[byte]bool
DataHandler DataHandlerFunc
CmdHandler CmdHandlerFunc
ln net.Listener
}
func NewTelnetServer(opts TelnetOpts) *TelnetServer {
ts := new(TelnetServer)
ts.ClientOptions = make(map[byte]bool)
ts.ServerOptions = make(map[byte]bool)
for _, v := range opts.ServerOpts {
ts.ServerOptions[v] = true
}
for _, v := range opts.ClientOpts {
ts.ClientOptions[v] = true
}
ts.DataHandler = opts.DataHandler
if ts.DataHandler == nil {
ts.DataHandler = defaultDataHandlerFunc
}
ts.CmdHandler = opts.CmdHandler
if ts.CmdHandler == nil {
ts.CmdHandler = defaultCmdHandlerFunc
}
ln, err := net.Listen("tcp", opts.Addr)
if err != nil {
panic(fmt.Sprintf("cannot start telnet server: %v", err))
}
ts.ln = ln
return ts
}
// Accept accepts a connection and returns the Telnet connection
func (ts *TelnetServer) Accept() (*TelnetConn, error) {
conn, _ := ts.ln.Accept()
log.Info("connection received")
opts := connOpts{
conn: conn,
cmdHandler: ts.CmdHandler,
dataHandler: ts.DataHandler,
serverOpts: ts.ServerOptions,
clientOpts: ts.ClientOptions,
fsm: newTelnetFSM(),
}
tc := newTelnetConn(opts)
go tc.writeLoop()
go tc.dataHandlerWrapper(tc.handlerWriter, tc.dataRW)
go tc.fsm.start()
go tc.startNegotiation()
return tc, nil
}