forked from goodrain/rainbond
-
Notifications
You must be signed in to change notification settings - Fork 0
/
client_context.go
233 lines (199 loc) · 5.11 KB
/
client_context.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
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
// Copyright (C) 2014-2018 Goodrain Co., Ltd.
// RAINBOND, Application Management Platform
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version. For any non-GPL usage of Rainbond,
// one or multiple Commercial Licenses authorized by Goodrain Co., Ltd.
// must be obtained first.
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
// You should have received a copy of the GNU General Public License
// along with this program. If not, see <http://www.gnu.org/licenses/>.
package app
import (
"bytes"
"encoding/base64"
"encoding/json"
"log"
"net/http"
"os"
"os/exec"
"strings"
"sync"
"syscall"
"unsafe"
"github.com/fatih/structs"
"github.com/gorilla/websocket"
)
type clientContext struct {
app *App
request *http.Request
connection *websocket.Conn
command *exec.Cmd
pty *os.File
writeMutex *sync.Mutex
}
const (
Input = '0'
Ping = '1'
ResizeTerminal = '2'
)
const (
Output = '0'
Pong = '1'
SetWindowTitle = '2'
SetPreferences = '3'
SetReconnect = '4'
)
type argResizeTerminal struct {
Columns float64
Rows float64
}
type ContextVars struct {
Command string
Pid int
Hostname string
RemoteAddr string
}
func (context *clientContext) goHandleClient() {
exit := make(chan bool, 2)
go func() {
defer func() { exit <- true }()
context.processSend()
}()
go func() {
defer func() { exit <- true }()
context.processReceive()
}()
go func() {
<-exit
context.pty.Close()
// Even if the PTY has been closed,
// Read(0 in processSend() keeps blocking and the process doen't exit
context.command.Process.Signal(syscall.Signal(context.app.options.CloseSignal))
context.command.Wait()
context.connection.Close()
log.Printf("Connection closed: %s", context.request.RemoteAddr)
}()
}
func (context *clientContext) processSend() {
if err := context.sendInitialize(); err != nil {
log.Printf(err.Error())
return
}
buf := make([]byte, 1024)
for {
size, err := context.pty.Read(buf)
if err != nil {
log.Printf("Command exited for: %s", context.request.RemoteAddr)
return
}
safeMessage := base64.StdEncoding.EncodeToString([]byte(buf[:size]))
if err = context.write(append([]byte{Output}, []byte(safeMessage)...)); err != nil {
log.Printf(err.Error())
return
}
}
}
func (context *clientContext) write(data []byte) error {
context.writeMutex.Lock()
defer context.writeMutex.Unlock()
return context.connection.WriteMessage(websocket.TextMessage, data)
}
func (context *clientContext) sendInitialize() error {
hostname, _ := os.Hostname()
titleVars := ContextVars{
Command: strings.Join(context.app.command, " "),
Pid: context.command.Process.Pid,
Hostname: hostname,
RemoteAddr: context.request.RemoteAddr,
}
titleBuffer := new(bytes.Buffer)
if err := context.app.titleTemplate.Execute(titleBuffer, titleVars); err != nil {
return err
}
if err := context.write(append([]byte{SetWindowTitle}, titleBuffer.Bytes()...)); err != nil {
return err
}
prefStruct := structs.New(context.app.options.Preferences)
prefMap := prefStruct.Map()
htermPrefs := make(map[string]interface{})
for key, value := range prefMap {
rawKey := prefStruct.Field(key).Tag("hcl")
if _, ok := context.app.options.RawPreferences[rawKey]; ok {
htermPrefs[strings.Replace(rawKey, "_", "-", -1)] = value
}
}
prefs, err := json.Marshal(htermPrefs)
if err != nil {
return err
}
if err := context.write(append([]byte{SetPreferences}, prefs...)); err != nil {
return err
}
if context.app.options.EnableReconnect {
reconnect, _ := json.Marshal(context.app.options.ReconnectTime)
if err := context.write(append([]byte{SetReconnect}, reconnect...)); err != nil {
return err
}
}
return nil
}
func (context *clientContext) processReceive() {
for {
_, data, err := context.connection.ReadMessage()
if err != nil {
log.Print(err.Error())
return
}
if len(data) == 0 {
log.Print("An error has occured")
return
}
switch data[0] {
case Input:
if !context.app.options.PermitWrite {
break
}
_, err := context.pty.Write(data[1:])
if err != nil {
return
}
case Ping:
if err := context.write([]byte{Pong}); err != nil {
log.Print(err.Error())
return
}
case ResizeTerminal:
var args argResizeTerminal
err = json.Unmarshal(data[1:], &args)
if err != nil {
log.Print("Malformed remote command")
return
}
window := struct {
row uint16
col uint16
x uint16
y uint16
}{
uint16(args.Rows),
uint16(args.Columns),
0,
0,
}
syscall.Syscall(
syscall.SYS_IOCTL,
context.pty.Fd(),
syscall.TIOCSWINSZ,
uintptr(unsafe.Pointer(&window)),
)
default:
log.Print("Unknown message type")
return
}
}
}