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huproxy.go
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huproxy.go
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// Copyright 2017 Google Inc.
//
// 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 main
import (
"context"
"flag"
"fmt"
"io"
"log"
"net"
"net/http"
"time"
"github.com/gorilla/mux"
"github.com/gorilla/websocket"
huproxy "github.com/google/huproxy/lib"
)
var (
listen = flag.String("listen", "127.0.0.1:8086", "Address to listen to.")
dialTimeout = flag.Duration("dial_timeout", 10*time.Second, "Dial timeout.")
handshakeTimeout = flag.Duration("handshake_timeout", 10*time.Second, "Handshake timeout.")
writeTimeout = flag.Duration("write_timeout", 10*time.Second, "Write timeout.")
url = flag.String("url", "proxy", "Path to listen to.")
upgrader websocket.Upgrader
)
func handleProxy(w http.ResponseWriter, r *http.Request) {
ctx, cancel := context.WithCancel(r.Context())
defer cancel()
vars := mux.Vars(r)
host := vars["host"]
port := vars["port"]
conn, err := upgrader.Upgrade(w, r, nil)
if err != nil {
log.Println(err)
return
}
defer conn.Close()
s, err := net.DialTimeout("tcp", net.JoinHostPort(host, port), *dialTimeout)
if err != nil {
log.Println(err)
return
}
// websocket -> server
go func() {
for {
mt, r, err := conn.NextReader()
if websocket.IsCloseError(err,
websocket.CloseNormalClosure, // Normal.
websocket.CloseAbnormalClosure, // OpenSSH killed proxy client.
) {
return
}
if err != nil {
log.Fatalf("nextreader: %v", err)
}
if mt != websocket.BinaryMessage {
log.Fatal("blah")
}
if _, err := io.Copy(s, r); err != nil {
log.Printf("Reading from websocket: %v", err)
cancel()
}
}
}()
// server -> websocket
// TODO: NextWriter() seems to be broken.
if err := huproxy.File2WS(ctx, cancel, s, conn); err == io.EOF {
if err := conn.WriteControl(websocket.CloseMessage,
websocket.FormatCloseMessage(websocket.CloseNormalClosure, ""),
time.Now().Add(*writeTimeout)); err == websocket.ErrCloseSent {
} else if err != nil {
log.Printf("Error sending close message: %v", err)
}
} else if err != nil {
log.Printf("Reading from file: %v", err)
}
}
func main() {
flag.Parse()
upgrader = websocket.Upgrader{
ReadBufferSize: 1024,
WriteBufferSize: 1024,
HandshakeTimeout: *handshakeTimeout,
CheckOrigin: func(r *http.Request) bool {
return true
},
}
log.Printf("huproxy %s", huproxy.Version)
m := mux.NewRouter()
m.HandleFunc(fmt.Sprintf("/%s/{host}/{port}", *url), handleProxy)
s := &http.Server{
Addr: *listen,
Handler: m,
ReadTimeout: 10 * time.Second,
WriteTimeout: 10 * time.Second,
MaxHeaderBytes: 1 << 20,
}
log.Fatal(s.ListenAndServe())
}