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/*
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 (
"errors"
"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)
}
pc, err := net.ListenPacket("udp", os.Args[2])
if err != nil {
log.Fatal(err)
}
defer pc.Close()
l := rudp.Listen(pc)
for {
clt, err := l.Accept()
if err != nil {
log.Print("accept: ", err)
continue
}
log.Print(clt.ID(), ": connected")
conn, err := net.Dial("udp", os.Args[1])
if err != nil {
log.Print(err)
continue
}
srv := rudp.Connect(conn)
go proxy(clt, srv)
go proxy(srv, clt)
}
}
func proxy(src, dest *rudp.Conn) {
s := fmt.Sprint(src.ID(), " (", src.RemoteAddr(), "): ")
for {
pkt, err := src.Recv()
if err != nil {
if errors.Is(err, net.ErrClosed) {
if err := src.WhyClosed(); err != nil {
log.Print(s, "disconnected: ", err)
} else {
log.Print(s, "disconnected")
}
break
}
log.Print(s, err)
continue
}
dest.Send(pkt)
}
dest.Close()
}
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