Fix nix builds: go dependencies are awful

netforward/stream.go

@@ -0,0 +1,47 @@
+// From https://github.com/goburrow/netforward
+package netforward
+
+import (
+	"io"
+	"log"
+	"net"
+)
+
+func Forward(remote Dialer, local net.Listener) error {
+	for {
+		conn, err := local.Accept()
+		if err != nil {
+			return err
+		}
+		go forward(remote, conn)
+	}
+}
+
+func forward(remote Dialer, conn io.ReadWriteCloser) {
+	defer conn.Close()
+
+	remoteConn, err := remote.Dial()
+	if err != nil {
+		log.Printf("dial failed: %v", err)
+		return
+	}
+	defer remoteConn.Close()
+
+	// remote -> local
+	go func() {
+		buf := getBuffer()
+		defer releaseBuffer(buf)
+		_, err := io.CopyBuffer(remoteConn, conn, buf)
+		if err != nil {
+			log.Printf("forward failed: %v", err)
+		}
+	}()
+
+	// local -> remote
+	buf := getBuffer()
+	defer releaseBuffer(buf)
+	_, err = io.CopyBuffer(conn, remoteConn, buf)
+	if err != nil {
+		log.Printf("forward failed: %v", err)
+	}
+}