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Go TCP Proxy / Port Forwarding Example (https://zupzup.org/go-port-forwarding/)
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package main | |
import ( | |
"flag" | |
"fmt" | |
"io" | |
"log" | |
"net" | |
"os" | |
"os/signal" | |
) | |
var ( | |
target string | |
port int | |
) | |
func init() { | |
flag.StringVar(&target, "target", "", "the target (<host>:<port>)") | |
flag.IntVar(&port, "port", 7757, "the tunnelthing port") | |
} | |
func main() { | |
flag.Parse() | |
signals := make(chan os.Signal, 1) | |
stop := make(chan bool) | |
signal.Notify(signals, os.Interrupt) | |
go func() { | |
for _ = range signals { | |
fmt.Println("\nReceived an interrupt, stopping...") | |
stop <- true | |
} | |
}() | |
incoming, err := net.Listen("tcp", fmt.Sprintf(":%d", port)) | |
if err != nil { | |
log.Fatalf("could not start server on %d: %v", port, err) | |
} | |
fmt.Printf("server running on %d\n", port) | |
client, err := incoming.Accept() | |
if err != nil { | |
log.Fatal("could not accept client connection", err) | |
} | |
defer client.Close() | |
fmt.Printf("client '%v' connected!\n", client.RemoteAddr()) | |
target, err := net.Dial("tcp", target) | |
if err != nil { | |
log.Fatal("could not connect to target", err) | |
} | |
defer target.Close() | |
fmt.Printf("connection to server %v established!\n", target.RemoteAddr()) | |
go func() { io.Copy(target, client) }() | |
go func() { io.Copy(client, target) }() | |
<-stop | |
} |
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