1 files changed, 85 insertions, 0 deletions
diff --git a/rudp/proxy/proxy.go b/rudp/proxy/proxy.go
new file mode 100644
index 0000000..6fc14ec
--- /dev/null
+++ b/rudp/proxy/proxy.go
@@ -0,0 +1,85 @@
+/*
+Proxy is a Minetest RUDP proxy server
+supporting multiple concurrent connections.
+
+Usage:
+	proxy dial:port listen:port
+where dial:port is the server address
+and listen:port is the address to listen on.
+*/
+package main
+
+import (
+	"fmt"
+	"log"
+	"net"
+	"os"
+
+	"github.com/anon55555/mt/rudp"
+)
+
+func main() {
+	if len(os.Args) != 3 {
+		fmt.Fprintln(os.Stderr, "usage: proxy dial:port listen:port")
+		os.Exit(1)
+	}
+
+	srvaddr, err := net.ResolveUDPAddr("udp", os.Args[1])
+	if err != nil {
+		log.Fatal(err)
+	}
+
+	lc, err := net.ListenPacket("udp", os.Args[2])
+	if err != nil {
+		log.Fatal(err)
+	}
+	defer lc.Close()
+
+	l := rudp.Listen(lc)
+	for {
+		clt, err := l.Accept()
+		if err != nil {
+			log.Print(err)
+			continue
+		}
+
+		log.Print(clt.Addr(), " connected")
+
+		conn, err := net.DialUDP("udp", nil, srvaddr)
+		if err != nil {
+			log.Print(err)
+			continue
+		}
+		srv := rudp.Connect(conn, conn.RemoteAddr())
+
+		go proxy(clt, srv)
+		go proxy(srv, clt)
+	}
+}
+
+func proxy(src, dest *rudp.Peer) {
+	for {
+		pkt, err := src.Recv()
+		if err != nil {
+			if err == rudp.ErrClosed {
+				msg := src.Addr().String() + " disconnected"
+				if src.TimedOut() {
+					msg += " (timed out)"
+				}
+				log.Print(msg)
+
+				break
+			}
+
+			log.Print(err)
+			continue
+		}
+
+		if _, err := dest.Send(pkt); err != nil {
+			log.Print(err)
+		}
+	}
+
+	dest.SendDisco(0, true)
+	dest.Close()
+}