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### Description Add support for forwarding WebSocket requests to arbitrary TCP servers. WebSockets were already forwarded transparently to backends before, and that is not changing. The new feature lets tlsproxy itself handle the WebSocket request and forward them to any TCP servers. The content of BinaryMessages is streamed to the remote server, and data received from the server is sent back to the client also as BinaryMessages. ### Type of change * [x] New feature * [ ] Feature improvement * [ ] Bug fix * [ ] Documentation * [ ] Cleanup / refactoring * [ ] Other (please explain) ### How is this change tested ? * [ ] Unit tests * [x] Manual tests (explain) * [ ] Tests are not needed
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,128 @@ | ||
| // MIT License | ||
| // | ||
| // Copyright (c) 2024 TTBT Enterprises LLC | ||
| // Copyright (c) 2024 Robin Thellend <[email protected]> | ||
| // | ||
| // Permission is hereby granted, free of charge, to any person obtaining a copy | ||
| // of this software and associated documentation files (the "Software"), to deal | ||
| // in the Software without restriction, including without limitation the rights | ||
| // to use, copy, modify, merge, publish, distribute, sublicense, and/or sell | ||
| // copies of the Software, and to permit persons to whom the Software is | ||
| // furnished to do so, subject to the following conditions: | ||
| // | ||
| // The above copyright notice and this permission notice shall be included in all | ||
| // copies or substantial portions of the Software. | ||
| // | ||
| // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR | ||
| // IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | ||
| // FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE | ||
| // AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER | ||
| // LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, | ||
| // OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE | ||
| // SOFTWARE. | ||
|
|
||
| package proxy | ||
|
|
||
| import ( | ||
| "io" | ||
| "net" | ||
| "net/http" | ||
| "time" | ||
|
|
||
| "github.com/gorilla/websocket" | ||
| ) | ||
|
|
||
| func newWebSocketUpgrader() *websocket.Upgrader { | ||
| return &websocket.Upgrader{ | ||
| ReadBufferSize: 8192, | ||
| WriteBufferSize: 8192, | ||
| } | ||
| } | ||
|
|
||
| func (p *Proxy) webSocketHandler(cfg WebSocketConfig) http.Handler { | ||
| return http.HandlerFunc(func(w http.ResponseWriter, req *http.Request) { | ||
| in, err := p.wsUpgrader.Upgrade(w, req, nil) | ||
| if err != nil { | ||
| p.logErrorF("ERR %v", err) | ||
| return | ||
| } | ||
| defer in.Close() | ||
|
|
||
| dialer := &net.Dialer{ | ||
| Timeout: 10 * time.Second, | ||
| KeepAlive: 30 * time.Second, | ||
| } | ||
| out, err := dialer.DialContext(req.Context(), "tcp", cfg.Address) | ||
| if err != nil { | ||
| p.logErrorF("ERR webSocketHandler: %v", err) | ||
| return | ||
| } | ||
|
|
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| done := make(chan bool, 2) | ||
|
|
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| lastActive := time.Now() | ||
| in.SetPongHandler(func(string) error { | ||
| lastActive = time.Now() | ||
| return nil | ||
| }) | ||
| go func() { | ||
| ctx := req.Context() | ||
| ticker := time.NewTicker(10 * time.Second) | ||
| defer ticker.Stop() | ||
| for { | ||
| select { | ||
| case <-ctx.Done(): | ||
| return | ||
| case <-ticker.C: | ||
| if time.Since(lastActive) > 30*time.Second { | ||
| done <- true | ||
| return | ||
| } | ||
| if err := in.WriteControl(websocket.PingMessage, []byte("ping"), time.Now().Add(5*time.Second)); err != nil { | ||
| p.logErrorF("ERR WriteControl: %v", err) | ||
| } | ||
| } | ||
| } | ||
| }() | ||
|
|
||
| // in -> out loop | ||
| go func() { | ||
| defer func() { | ||
| done <- true | ||
| }() | ||
| for { | ||
| messageType, r, err := in.NextReader() | ||
| if err != nil { | ||
| return | ||
| } | ||
| if messageType != websocket.BinaryMessage { | ||
| continue | ||
| } | ||
| if _, err := io.Copy(out, r); err != nil { | ||
| return | ||
| } | ||
| } | ||
| }() | ||
|
|
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| // out -> in loop | ||
| go func() { | ||
| defer func() { | ||
| done <- true | ||
| }() | ||
| buf := make([]byte, 1024) | ||
| for { | ||
| n, err := out.Read(buf) | ||
| if n > 0 { | ||
| if err := in.WriteMessage(websocket.BinaryMessage, buf[:n]); err != nil { | ||
| return | ||
| } | ||
| } | ||
| if err != nil { | ||
| return | ||
| } | ||
| } | ||
| }() | ||
|
|
||
| <-done | ||
| }) | ||
| } |