https://github.com/maxmcd/tcp-proxy
A simple tcp proxy written in Go.
https://github.com/maxmcd/tcp-proxy
golang proxy tcp
Last synced: about 1 year ago
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A simple tcp proxy written in Go.
- Host: GitHub
- URL: https://github.com/maxmcd/tcp-proxy
- Owner: maxmcd
- Created: 2021-05-07T20:17:31.000Z (about 5 years ago)
- Default Branch: main
- Last Pushed: 2022-01-12T02:51:06.000Z (over 4 years ago)
- Last Synced: 2024-10-31T21:42:39.443Z (over 1 year ago)
- Topics: golang, proxy, tcp
- Language: Go
- Homepage: https://hub.docker.com/r/maxmcd/tcp-proxy
- Size: 4.88 KB
- Stars: 21
- Watchers: 4
- Forks: 13
- Open Issues: 0
-
Metadata Files:
- Readme: README.md
Awesome Lists containing this project
README
# TCP Proxy
A simple tcp proxy written in go.
Use like:
```bash
# with docker
docker run -p 20000:20000 maxmcd/tcp-proxy tcp-proxy -l 0.0.0.0:20000 -r 100.111.145.101:2000
# install with go
go get github.com/maxmcd/tcp-proxy
# and then use it
tcp-proxy -l 0.0.0.0:20000 -r 100.111.145.101:2000
```
Full source:
```go
package main
import (
"flag"
"fmt"
"io"
"log"
"net"
)
var localAddr *string = flag.String("l", "localhost:9999", "local address")
var remoteAddr *string = flag.String("r", "localhost:80", "remote address")
func main() {
flag.Parse()
fmt.Printf("Listening: %v\nProxying: %v\n\n", *localAddr, *remoteAddr)
listener, err := net.Listen("tcp", *localAddr)
if err != nil {
panic(err)
}
for {
conn, err := listener.Accept()
log.Println("New connection", conn.RemoteAddr())
if err != nil {
log.Println("error accepting connection", err)
continue
}
go func() {
defer conn.Close()
conn2, err := net.Dial("tcp", *remoteAddr)
if err != nil {
log.Println("error dialing remote addr", err)
return
}
defer conn2.Close()
closer := make(chan struct{}, 2)
go copy(closer, conn2, conn)
go copy(closer, conn, conn2)
<-closer
log.Println("Connection complete", conn.RemoteAddr())
}()
}
}
func copy(closer chan struct{}, dst io.Writer, src io.Reader) {
_, _ = io.Copy(dst, src)
closer <- struct{}{} // connection is closed, send signal to stop proxy
}
```