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
|
/* SPDX-License-Identifier: GPL-2.0-or-later
*
* Copyright (C) 2017-2018 Jason A. Donenfeld <Jason@zx2c4.com>. All Rights Reserved.
*/
package main
// #cgo LDFLAGS: -llog
// #include <android/log.h>
import "C"
import (
"bufio"
"git.zx2c4.com/wireguard-go/tun"
"golang.org/x/sys/unix"
"io/ioutil"
"log"
"math"
"os"
"os/signal"
"runtime"
"strings"
"unsafe"
)
type AndroidLogger struct {
level C.int
interfaceName string
}
func (l AndroidLogger) Write(p []byte) (int, error) {
C.__android_log_write(l.level, C.CString("WireGuard/GoBackend/"+l.interfaceName), C.CString(string(p)))
return len(p), nil
}
var tunnelHandles map[int32]*Device
func init() {
tunnelHandles = make(map[int32]*Device)
signals := make(chan os.Signal)
signal.Notify(signals, unix.SIGUSR2)
go func() {
buf := make([]byte, os.Getpagesize())
for {
select {
case <-signals:
n := runtime.Stack(buf, true)
buf[n] = 0
C.__android_log_write(C.ANDROID_LOG_ERROR, C.CString("WireGuard/GoBackend/Stacktrace"), (*_Ctype_char)(unsafe.Pointer(&buf[0])))
}
}
}()
}
//export wgTurnOn
func wgTurnOn(ifnameRef string, tun_fd int32, settings string) int32 {
interfaceName := string([]byte(ifnameRef))
logger := &Logger{
Debug: log.New(&AndroidLogger{level: C.ANDROID_LOG_DEBUG, interfaceName: interfaceName}, "", 0),
Info: log.New(&AndroidLogger{level: C.ANDROID_LOG_INFO, interfaceName: interfaceName}, "", 0),
Error: log.New(&AndroidLogger{level: C.ANDROID_LOG_ERROR, interfaceName: interfaceName}, "", 0),
}
logger.Debug.Println("Debug log enabled")
tun, name, err := tun.CreateTUNFromFD(int(tun_fd))
if err != nil {
unix.Close(int(tun_fd))
logger.Error.Println(err)
return -1
}
logger.Info.Println("Attaching to interface", name)
device := NewDevice(tun, logger)
logger.Debug.Println("Interface has MTU", device.tun.mtu)
bufferedSettings := bufio.NewReadWriter(bufio.NewReader(strings.NewReader(settings)), bufio.NewWriter(ioutil.Discard))
setError := ipcSetOperation(device, bufferedSettings)
if setError != nil {
unix.Close(int(tun_fd))
logger.Error.Println(setError)
return -1
}
device.Up()
logger.Info.Println("Device started")
var i int32
for i = 0; i < math.MaxInt32; i++ {
if _, exists := tunnelHandles[i]; !exists {
break
}
}
if i == math.MaxInt32 {
unix.Close(int(tun_fd))
return -1
}
tunnelHandles[i] = device
return i
}
//export wgTurnOff
func wgTurnOff(tunnelHandle int32) {
device, ok := tunnelHandles[tunnelHandle]
if !ok {
return
}
delete(tunnelHandles, tunnelHandle)
device.Close()
}
//export wgGetSocketV4
func wgGetSocketV4(tunnelHandle int32) int32 {
device, ok := tunnelHandles[tunnelHandle]
if !ok {
return -1
}
native, ok := device.net.bind.(*NativeBind)
if !ok {
return -1
}
fd := int32(-1)
conn, err := native.ipv4.SyscallConn()
if err != nil {
return -1
}
err = conn.Control(func(f uintptr) {
fd = int32(f)
})
if err != nil {
return -1
}
return fd
}
//export wgGetSocketV6
func wgGetSocketV6(tunnelHandle int32) int32 {
device, ok := tunnelHandles[tunnelHandle]
if !ok {
return -1
}
native, ok := device.net.bind.(*NativeBind)
if !ok {
return -1
}
fd := int32(-1)
conn, err := native.ipv6.SyscallConn()
if err != nil {
return -1
}
err = conn.Control(func(f uintptr) {
fd = int32(f)
})
if err != nil {
return -1
}
return fd
}
func main() {}
|
