├── README.md
├── src
    └── gotunnelme
    │   ├── get_assigned_url_test.go
    │   ├── tunnel_test.go
    │   ├── get_assigned_url.go
    │   └── tunnel.go
├── .gitignore
├── main.go
└── LICENSE


/README.md:
--------------------------------------------------------------------------------
 1 | gotunnelme
 2 | ==========
 3 | 
 4 | golang version of http://localtunnel.me client
 5 | 
 6 | 
 7 | Run either as commandline program:
 8 | 
 9 | ```
10 | gotunnelme <local port>
11 | ```
12 | 
13 | Or you can use the library at `src/gotunnelme/`
14 | 


--------------------------------------------------------------------------------
/src/gotunnelme/get_assigned_url_test.go:
--------------------------------------------------------------------------------
 1 | package gotunnelme
 2 | 
 3 | import (
 4 | 	"fmt"
 5 | 	"testing"
 6 | )
 7 | 
 8 | func _TestGetAssignedUrl(t *testing.T) {
 9 | 	Debug = false
10 | 	assignedUrlInfo, err := GetAssignedUrl("noah")
11 | 	if err != nil {
12 | 		t.Fatal(err)
13 | 	}
14 | 	fmt.Printf("assignedUrlInfo: %+v\n", assignedUrlInfo)
15 | }
16 | 


--------------------------------------------------------------------------------
/.gitignore:
--------------------------------------------------------------------------------
 1 | # Compiled Object files, Static and Dynamic libs (Shared Objects)
 2 | *.o
 3 | *.a
 4 | *.so
 5 | 
 6 | # Folders
 7 | _obj
 8 | _test
 9 | 
10 | # Architecture specific extensions/prefixes
11 | *.[568vq]
12 | [568vq].out
13 | 
14 | *.cgo1.go
15 | *.cgo2.c
16 | _cgo_defun.c
17 | _cgo_gotypes.go
18 | _cgo_export.*
19 | 
20 | _testmain.go
21 | 
22 | *.exe
23 | 


--------------------------------------------------------------------------------
/src/gotunnelme/tunnel_test.go:
--------------------------------------------------------------------------------
 1 | package gotunnelme
 2 | 
 3 | import (
 4 | 	"fmt"
 5 | 	"testing"
 6 | 	"time"
 7 | )
 8 | 
 9 | func TestTunnel(t *testing.T) {
10 | 	Debug = true
11 | 	tunnel := NewTunnel()
12 | 	url, getUrlErr := tunnel.GetUrl("noah")
13 | 	if getUrlErr != nil {
14 | 		t.Fatal(getUrlErr)
15 | 	}
16 | 	fmt.Println("Get Url:", url)
17 | 	go func() {
18 | 		tunnelErr := tunnel.CreateTunnel(8787)
19 | 		if tunnelErr != nil {
20 | 			t.Fatal(tunnelErr)
21 | 		}
22 | 	}()
23 | 	time.Sleep(30 * time.Second)
24 | 	tunnel.StopTunnel()
25 | }
26 | 


--------------------------------------------------------------------------------
/main.go:
--------------------------------------------------------------------------------
 1 | package main
 2 | 
 3 | import (
 4 | 	"fmt"
 5 | 	"github.com/NoahShen/gotunnelme/src/gotunnelme"
 6 | 	"os"
 7 | 	"strconv"
 8 | )
 9 | 
10 | func main() {
11 | 	if len(os.Args) == 1 {
12 | 		fmt.Fprintln(os.Stderr, "gotunnelme <local port>")
13 | 		os.Exit(1)
14 | 	}
15 | 	i, err := strconv.Atoi(os.Args[1])
16 | 	if err != nil {
17 | 		fmt.Fprintln(os.Stderr, err)
18 | 		os.Exit(1)
19 | 	}
20 | 	t := gotunnelme.NewTunnel()
21 | 	url, err := t.GetUrl("")
22 | 	if err != nil {
23 | 		panic(err)
24 | 	}
25 | 	print(url)
26 | 	err = t.CreateTunnel(i)
27 | 	if err != nil {
28 | 		panic(err)
29 | 	}
30 | 	t.StopTunnel()
31 | }
32 | 


--------------------------------------------------------------------------------
/src/gotunnelme/get_assigned_url.go:
--------------------------------------------------------------------------------
 1 | package gotunnelme
 2 | 
 3 | import (
 4 | 	"encoding/json"
 5 | 	"fmt"
 6 | 	"io/ioutil"
 7 | 	"net/http"
 8 | )
 9 | 
10 | const (
11 | 	localtunnelServer = "http://localtunnel.me/"
12 | )
13 | 
14 | type AssignedUrlInfo struct {
15 | 	Id           string `json:"id,omitempty"`
16 | 	Url          string `json:"url,omitempty"`
17 | 	Port         int    `json:"port,omitempty"`
18 | 	MaxConnCount int    `json:"max_conn_count,omitempty"`
19 | }
20 | 
21 | func GetAssignedUrl(assignedDomain string) (*AssignedUrlInfo, error) {
22 | 	if len(assignedDomain) == 0 {
23 | 		assignedDomain = "?new"
24 | 	}
25 | 	url := fmt.Sprintf(localtunnelServer+"%s", assignedDomain)
26 | 	request, _ := http.NewRequest("GET", url, nil)
27 | 	response, httpErr := http.DefaultClient.Do(request)
28 | 	if httpErr != nil {
29 | 		return nil, httpErr
30 | 	}
31 | 	defer response.Body.Close()
32 | 	bytes, readErr := ioutil.ReadAll(response.Body)
33 | 	if readErr != nil {
34 | 		return nil, readErr
35 | 	}
36 | 	if Debug {
37 | 		fmt.Printf("***GetAssignedUrl: %s\n", string(bytes))
38 | 	}
39 | 
40 | 	assignedUrlInfo := &AssignedUrlInfo{}
41 | 	if unmarshalErr := json.Unmarshal(bytes, assignedUrlInfo); unmarshalErr != nil {
42 | 		return nil, unmarshalErr
43 | 	}
44 | 	return assignedUrlInfo, nil
45 | }
46 | 


--------------------------------------------------------------------------------
/src/gotunnelme/tunnel.go:
--------------------------------------------------------------------------------
  1 | package gotunnelme
  2 | 
  3 | import (
  4 | 	"bufio"
  5 | 	"errors"
  6 | 	"fmt"
  7 | 	"io"
  8 | 	"net"
  9 | 	"net/http"
 10 | 	"net/url"
 11 | 	"os"
 12 | 	"strings"
 13 | )
 14 | 
 15 | var Debug = false
 16 | 
 17 | type TunnelConn struct {
 18 | 	remoteHost   string
 19 | 	remotePort   int
 20 | 	localPort    int
 21 | 	remoteConn   net.Conn
 22 | 	localConn    net.Conn
 23 | 	errorChannel chan error
 24 | }
 25 | 
 26 | func NewTunnelConn(remoteHost string, remotePort, localPort int) *TunnelConn {
 27 | 	tunnelConn := &TunnelConn{}
 28 | 	tunnelConn.remoteHost = remoteHost
 29 | 	tunnelConn.remotePort = remotePort
 30 | 	tunnelConn.localPort = localPort
 31 | 	return tunnelConn
 32 | }
 33 | 
 34 | func (self *TunnelConn) Tunnel(replyCh chan<- int) error {
 35 | 	self.errorChannel = make(chan error, 1) // clear previous channel's message
 36 | 	remoteConn, remoteErr := self.connectRemote()
 37 | 	if remoteErr != nil {
 38 | 		if Debug {
 39 | 			fmt.Printf("Connect remote error[%s]!\n", remoteErr.Error())
 40 | 		}
 41 | 		replyCh <- -1
 42 | 		return remoteErr
 43 | 	}
 44 | 
 45 | 	if Debug {
 46 | 		fmt.Printf("Connect remote[%s:%d] successful!\n", self.remoteHost, self.remotePort)
 47 | 	}
 48 | 
 49 | 	localConn, localErr := self.connectLocal()
 50 | 	if localErr != nil {
 51 | 		if Debug {
 52 | 			fmt.Printf("Connect local error[%s]!\n", localErr.Error())
 53 | 		}
 54 | 		replyCh <- -1
 55 | 		return localErr
 56 | 	}
 57 | 	if Debug {
 58 | 		fmt.Printf("Connect local[:%d] successful!\n", self.localPort)
 59 | 	}
 60 | 
 61 | 	self.remoteConn = remoteConn
 62 | 	self.localConn = localConn
 63 | 	go func() {
 64 | 		var err error
 65 | 		for {
 66 | 			_, err = io.Copy(remoteConn, localConn)
 67 | 			if err != nil {
 68 | 				if Debug {
 69 | 					fmt.Printf("Stop copy form local to remote! error=[%v]\n", err)
 70 | 				}
 71 | 				break
 72 | 			}
 73 | 		}
 74 | 		self.errorChannel <- err
 75 | 	}()
 76 | 	go func() {
 77 | 		var err error
 78 | 		for {
 79 | 			_, err = io.Copy(localConn, remoteConn)
 80 | 			if err != nil {
 81 | 				if Debug {
 82 | 					fmt.Printf("Stop copy form remote to local! error=[%v]\n", err)
 83 | 				}
 84 | 				break
 85 | 			}
 86 | 
 87 | 		}
 88 | 		self.errorChannel <- err
 89 | 	}()
 90 | 	err := <-self.errorChannel
 91 | 	replyCh <- 1
 92 | 	return err
 93 | }
 94 | 
 95 | func (self *TunnelConn) StopTunnel() error {
 96 | 	if self.remoteConn != nil {
 97 | 		self.remoteConn.Close()
 98 | 	}
 99 | 	if self.localConn != nil {
100 | 		self.localConn.Close()
101 | 	}
102 | 	return nil
103 | }
104 | 
105 | func (self *TunnelConn) connectRemote() (net.Conn, error) {
106 | 	remoteAddr := fmt.Sprintf("%s:%d", self.remoteHost, self.remotePort)
107 | 	addr := remoteAddr
108 | 	proxy := os.Getenv("HTTP_PROXY")
109 | 	if proxy == "" {
110 | 		proxy = os.Getenv("http_proxy")
111 | 	}
112 | 	if len(proxy) > 0 {
113 | 		url, err := url.Parse(proxy)
114 | 		if err == nil {
115 | 			addr = url.Host
116 | 		}
117 | 	}
118 | 	remoteConn, remoteErr := net.Dial("tcp", addr)
119 | 	if remoteErr != nil {
120 | 		return nil, remoteErr
121 | 	}
122 | 
123 | 	if len(proxy) > 0 {
124 | 		fmt.Fprintf(remoteConn, "CONNECT %s HTTP/1.1\r\n", remoteAddr)
125 | 		fmt.Fprintf(remoteConn, "Host: %s\r\n", remoteAddr)
126 | 		fmt.Fprintf(remoteConn, "\r\n")
127 | 		br := bufio.NewReader(remoteConn)
128 | 		req, _ := http.NewRequest("CONNECT", remoteAddr, nil)
129 | 		resp, readRespErr := http.ReadResponse(br, req)
130 | 		if readRespErr != nil {
131 | 			return nil, readRespErr
132 | 		}
133 | 		if resp.StatusCode != 200 {
134 | 			f := strings.SplitN(resp.Status, " ", 2)
135 | 			return nil, errors.New(f[1])
136 | 		}
137 | 
138 | 		if Debug {
139 | 			fmt.Printf("Connect %s by proxy[%s].\n", remoteAddr, proxy)
140 | 		}
141 | 	}
142 | 	return remoteConn, nil
143 | }
144 | 
145 | func (self *TunnelConn) connectLocal() (net.Conn, error) {
146 | 	localAddr := fmt.Sprintf("%s:%d", "localhost", self.localPort)
147 | 	return net.Dial("tcp", localAddr)
148 | }
149 | 
150 | type TunnelCommand int
151 | 
152 | const (
153 | 	stopTunnelCmd TunnelCommand = 1
154 | )
155 | 
156 | type Tunnel struct {
157 | 	assignedUrlInfo *AssignedUrlInfo
158 | 	localPort       int
159 | 	tunnelConns     []*TunnelConn
160 | 	cmdChan         chan TunnelCommand
161 | }
162 | 
163 | func NewTunnel() *Tunnel {
164 | 	tunnel := &Tunnel{}
165 | 	tunnel.cmdChan = make(chan TunnelCommand, 1)
166 | 	return tunnel
167 | }
168 | 
169 | func (self *Tunnel) startTunnel() error {
170 | 	if err := self.checkLocalPort(); err != nil {
171 | 		return err
172 | 	}
173 | 	url, parseErr := url.Parse(localtunnelServer)
174 | 	if parseErr != nil {
175 | 		return parseErr
176 | 	}
177 | 	replyCh := make(chan int, self.assignedUrlInfo.MaxConnCount)
178 | 	remoteHost := url.Host
179 | 	for i := 0; i < self.assignedUrlInfo.MaxConnCount; i++ {
180 | 		tunnelConn := NewTunnelConn(remoteHost, self.assignedUrlInfo.Port, self.localPort)
181 | 		self.tunnelConns[i] = tunnelConn
182 | 		go tunnelConn.Tunnel(replyCh)
183 | 	}
184 | L:
185 | 	for i := 0; i < self.assignedUrlInfo.MaxConnCount; i++ {
186 | 		select {
187 | 		case <-replyCh:
188 | 		case cmd := <-self.cmdChan:
189 | 			switch cmd {
190 | 			case stopTunnelCmd:
191 | 				break L
192 | 			}
193 | 		}
194 | 	}
195 | 
196 | 	return nil
197 | }
198 | 
199 | func (self *Tunnel) checkLocalPort() error {
200 | 	localAddr := fmt.Sprintf("%s:%d", "localhost", self.localPort)
201 | 	c, err := net.Dial("tcp", localAddr)
202 | 	if err != nil {
203 | 		return errors.New("can't connect local port!")
204 | 	}
205 | 	c.Close()
206 | 	return nil
207 | }
208 | 
209 | func (self *Tunnel) StopTunnel() {
210 | 	if Debug {
211 | 		fmt.Printf("Stop tunnel for localPort[%d]!\n", self.localPort)
212 | 	}
213 | 	self.cmdChan <- stopTunnelCmd
214 | 	for _, tunnelCon := range self.tunnelConns {
215 | 		tunnelCon.StopTunnel()
216 | 	}
217 | }
218 | 
219 | func (self *Tunnel) GetUrl(assignedDomain string) (string, error) {
220 | 	if len(assignedDomain) == 0 {
221 | 		assignedDomain = "?new"
222 | 	}
223 | 	assignedUrlInfo, err := GetAssignedUrl(assignedDomain)
224 | 	if err != nil {
225 | 		return "", err
226 | 	}
227 | 	self.assignedUrlInfo = assignedUrlInfo
228 | 	self.tunnelConns = make([]*TunnelConn, assignedUrlInfo.MaxConnCount)
229 | 	return assignedUrlInfo.Url, nil
230 | }
231 | 
232 | func (self *Tunnel) CreateTunnel(localPort int) error {
233 | 	self.localPort = localPort
234 | 	return self.startTunnel()
235 | }
236 | 


--------------------------------------------------------------------------------
/LICENSE:
--------------------------------------------------------------------------------
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--------------------------------------------------------------------------------