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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"
"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 errors.Is(err, net.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()
}
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