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feat: support RDP connection to private IP machines (#75)
* feat: support intranet desktop connect * fix: lint * fix: lint * fix: clean code * fix: clean code * fix: clean code * fix: clean code * fix: clean code * fix: clean code * fix: support hot restart client
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,160 @@ | ||
| // Copyright 2024 The casbin Authors. All Rights Reserved. | ||
| // | ||
| // Licensed under the Apache License, Version 2.0 (the "License"); | ||
| // you may not use this file except in compliance with the License. | ||
| // You may obtain a copy of the License at | ||
| // | ||
| // http://www.apache.org/licenses/LICENSE-2.0 | ||
| // | ||
| // Unless required by applicable law or agreed to in writing, software | ||
| // distributed under the License is distributed on an "AS IS" BASIS, | ||
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| // See the License for the specific language governing permissions and | ||
| // limitations under the License. | ||
|
|
||
| package client | ||
|
|
||
| import ( | ||
| "errors" | ||
| "fmt" | ||
| "time" | ||
|
|
||
| "github.com/casvisor/casvisor/proxy/tunnel" | ||
| ) | ||
|
|
||
| type Client struct { | ||
| Name string | ||
| LocalPort int | ||
| RemoteAddr string | ||
| RemotePort int | ||
| proxyApps map[string]*tunnel.AppInfo | ||
| heartbeatChan chan *tunnel.Message // when get heartbeat msg, put msg in | ||
| conn *tunnel.Conn | ||
| } | ||
|
|
||
| func NewClient(name string, remoteAddr string, remotePort int, appInfo *tunnel.AppInfo) *Client { | ||
| client := &Client{ | ||
| Name: name, | ||
| RemoteAddr: remoteAddr, | ||
| RemotePort: remotePort, | ||
| heartbeatChan: make(chan *tunnel.Message, 1), | ||
| proxyApps: make(map[string]*tunnel.AppInfo), | ||
| } | ||
|
|
||
| if appInfo != nil { | ||
| client.proxyApps[appInfo.Name] = appInfo | ||
| } | ||
| return client | ||
| } | ||
|
|
||
| func (c *Client) sendInitAppMsg() error { | ||
| if c.proxyApps == nil { | ||
| return errors.New("proxyApps is nil") | ||
| } | ||
|
|
||
| msg := tunnel.NewMessage(tunnel.InitApp, "", c.Name, c.proxyApps) | ||
| if err := c.conn.SendMessage(msg); err != nil { | ||
| return err | ||
| } | ||
| return nil | ||
| } | ||
|
|
||
| func (c *Client) storeAppServer(msg *tunnel.Message) { | ||
| println("---------- Sever ----------") | ||
| for name, app := range c.proxyApps { | ||
| fmt.Printf("[%s]:\t%s:%d\n", name, c.conn.GetRemoteIP(), app.ListenPort) | ||
| } | ||
| println("---------------------------") | ||
|
|
||
| // prepared, start first heartbeat | ||
| c.heartbeatChan <- msg | ||
|
|
||
| // keep Heartbeat | ||
| go func() { | ||
| for { | ||
| select { | ||
| case <-c.heartbeatChan: | ||
| time.Sleep(tunnel.HeartbeatInterval) | ||
| resp := tunnel.NewMessage(tunnel.ClientHeartbeat, "", c.Name, nil) | ||
| err := c.conn.SendMessage(resp) | ||
| if err != nil { | ||
| return | ||
| } | ||
| case <-time.After(tunnel.HeartbeatTimeout): | ||
| if c.conn != nil { | ||
| c.conn.Close() | ||
| return | ||
| } | ||
| } | ||
| } | ||
| }() | ||
| } | ||
|
|
||
| func (c *Client) handleBindMsg(msg *tunnel.Message) { | ||
| appProxyName := msg.Content | ||
| if appProxyName == "" { | ||
| return | ||
| } | ||
|
|
||
| appInfo, ok := c.proxyApps[appProxyName] | ||
| if !ok { | ||
| return | ||
| } | ||
|
|
||
| localConn, err := tunnel.Dial(appInfo.LocalAddress, appInfo.LocalPort) | ||
| if err != nil { | ||
| defer localConn.Close() | ||
| panic(err) | ||
| return | ||
| } | ||
|
|
||
| remoteConn, err := tunnel.Dial(c.RemoteAddr, appInfo.ListenPort) | ||
| if err != nil { | ||
| defer remoteConn.Close() | ||
| panic(err) | ||
| return | ||
| } | ||
|
|
||
| bindMsg := tunnel.NewMessage(tunnel.ClientBind, msg.Content, c.Name, nil) | ||
| err = remoteConn.SendMessage(bindMsg) | ||
| if err != nil { | ||
| panic(err) | ||
| return | ||
| } | ||
|
|
||
| go tunnel.Bind(localConn, remoteConn) | ||
| } | ||
|
|
||
| func (c *Client) Start(startClientChan chan string) { | ||
| conn, err := tunnel.Dial(c.RemoteAddr, c.RemotePort) | ||
| if err != nil { | ||
| return | ||
| } | ||
| c.conn = conn | ||
| defer c.conn.Close() | ||
|
|
||
| err = c.sendInitAppMsg() | ||
| if err != nil { | ||
| return | ||
| } | ||
|
|
||
| for { | ||
| msg, err := c.conn.ReadMessage() | ||
| if err != nil { | ||
| return | ||
| } | ||
|
|
||
| switch msg.Type { | ||
| case tunnel.ServerHeartbeat: | ||
| c.heartbeatChan <- msg | ||
| case tunnel.AppMsg: | ||
| c.storeAppServer(msg) | ||
| case tunnel.AppWaitBind: | ||
| go c.handleBindMsg(msg) | ||
| case tunnel.ClientRestart: | ||
| c.conn.Close() | ||
| startClientChan <- msg.Name | ||
| return | ||
| } | ||
| } | ||
| } |
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