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proxy.go
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package gamma
import (
"fmt"
"github.com/lhridder/gamma/protocol"
"github.com/pires/go-proxyproto"
"github.com/prometheus/client_golang/prometheus"
"github.com/prometheus/client_golang/prometheus/promauto"
"github.com/sandertv/go-raknet"
"log"
"net"
"strings"
"sync"
"time"
)
var (
playersConnected = promauto.NewGaugeVec(prometheus.GaugeOpts{
Name: "gamma_connected",
Help: "The total number of connected players",
}, []string{"host"})
)
type Proxy struct {
Config *ProxyConfig
UID string
mu sync.Mutex
Dialer raknet.Dialer
}
func (proxy *Proxy) DomainNames() []string {
proxy.Config.RLock()
defer proxy.Config.RUnlock()
return proxy.Config.Domains
}
func (proxy *Proxy) DomainName() string {
proxy.Config.RLock()
defer proxy.Config.RUnlock()
return proxy.Config.Domains[0]
}
func (proxy *Proxy) ListenTo() string {
proxy.Config.RLock()
defer proxy.Config.RUnlock()
return proxy.Config.ListenTo
}
func (proxy *Proxy) ProxyTo() string {
proxy.Config.RLock()
defer proxy.Config.RUnlock()
return proxy.Config.ProxyTo
}
func (proxy *Proxy) DisconnectMessage() string {
proxy.Config.RLock()
defer proxy.Config.RUnlock()
return proxy.Config.DialTimeoutMessage
}
func (proxy *Proxy) Timeout() time.Duration {
proxy.Config.RLock()
defer proxy.Config.RUnlock()
return time.Duration(proxy.Config.DialTimeout) * time.Millisecond
}
func (proxy *Proxy) ProxyProtocol() bool {
proxy.Config.RLock()
defer proxy.Config.RUnlock()
return proxy.Config.SendProxyProtocol
}
func (proxy *Proxy) ProxyBind() string {
proxy.Config.RLock()
defer proxy.Config.RUnlock()
return proxy.Config.ProxyBind
}
func (proxy *Proxy) UIDs() []string {
var uids []string
for _, domain := range proxy.DomainNames() {
uid := proxyUID(domain, proxy.ListenTo())
uids = append(uids, uid)
}
return uids
}
func proxyUID(domain, addr string) string {
return fmt.Sprintf("%s@%s", strings.ToLower(domain), addr)
}
func (proxy *Proxy) Dial() (*raknet.Conn, error) {
c, err := proxy.Dialer.Dial(proxy.Config.ProxyTo)
if err != nil {
return nil, err
}
return c, err
}
type proxyProtocolDialer struct {
connAddr net.Addr
upstreamDialer raknet.UpstreamDialer
}
func (d proxyProtocolDialer) Dial(network, address string) (net.Conn, error) {
rc, err := d.upstreamDialer.Dial(network, address)
if err != nil {
return nil, err
}
header := &proxyproto.Header{
Version: 2,
Command: proxyproto.PROXY,
TransportProtocol: proxyproto.UDPv4,
SourceAddr: d.connAddr.(*net.UDPAddr),
DestinationAddr: rc.RemoteAddr(),
}
if _, err = header.WriteTo(rc); err != nil {
return rc, err
}
return rc, nil
}
func (proxy *Proxy) HandleLogin(conn protocol.ProcessedConn) error {
if proxy.ProxyProtocol() {
proxy.Dialer = raknet.Dialer{
UpstreamDialer: &net.Dialer{
Timeout: 5 * time.Second,
LocalAddr: &net.UDPAddr{
IP: net.ParseIP(proxy.ProxyBind()),
},
},
}
proxy.Dialer.UpstreamDialer = &proxyProtocolDialer{
connAddr: conn.RemoteAddr,
upstreamDialer: proxy.Dialer.UpstreamDialer,
}
}
rc, err := proxy.Dial()
if err != nil {
log.Printf("[i] %s did not respond to ping; is the target offline?", proxy.ProxyTo())
err := conn.Disconnect(proxy.DisconnectMessage())
if err != nil {
return err
}
return nil
}
defer rc.Close()
if _, err := rc.Write(conn.NetworkBytes); err != nil {
rc.Close()
return err
}
_, err = rc.ReadPacket()
if err != nil {
return err
}
if _, err := rc.Write(conn.ReadBytes); err != nil {
rc.Close()
return err
}
playersConnected.With(prometheus.Labels{"host": proxy.DomainName()}).Inc()
defer playersConnected.With(prometheus.Labels{"host": proxy.DomainName()}).Dec()
go func() {
for {
pk, err := rc.ReadPacket()
if err != nil {
return
}
_, err = conn.Write(pk)
if err != nil {
return
}
}
}()
for {
pk, err := conn.ReadPacket()
if err != nil {
return err
}
_, err = rc.Write(pk)
if err != nil {
return err
}
}
}