cmd/q3rcon-proxy/main.go

@@ -2,12 +2,10 @@ package main
 
 import (
 	"fmt"
+	"log"
 	"os"
-	"strconv"
 	"strings"
 
-	log "github.com/sirupsen/logrus"
-
 	"github.com/onyx-and-iris/q3rcon-proxy/pkg/udpproxy"
 )
 
@@ -31,18 +29,6 @@ var (
 	proxies, host string
 )
 
-func getenvInt(key string) (int, error) {
-	s := os.Getenv(key)
-	if s == "" {
-		return 0, nil
-	}
-	v, err := strconv.Atoi(s)
-	if err != nil {
-		return 0, err
-	}
-	return v, nil
-}
-
 func init() {
 	proxies = os.Getenv("Q3RCON_PROXY")
 	if proxies == "" {
@@ -53,18 +39,6 @@ func init() {
 	if host == "" {
 		host = "0.0.0.0"
 	}
-
-	debug, err := getenvInt("Q3RCON_DEBUG")
-	if err != nil {
-		log.Fatal(err)
-	}
-
-	if debug == 1 {
-		log.SetLevel(log.DebugLevel)
-	} else {
-		log.SetLevel(log.InfoLevel)
-	}
-
 }
 
 func main() {

pkg/udpproxy/session.go

@@ -1,7 +1,6 @@
 package udpproxy
 
 import (
-	"errors"
 	"net"
 	"strings"
 	"time"
@@ -16,7 +15,7 @@ type Session struct {
 	updateTime time.Time
 }
 
-func newSession(caddr *net.UDPAddr, raddr *net.UDPAddr, proxyConn *net.UDPConn) (*Session, error) {
+func createSession(caddr *net.UDPAddr, raddr *net.UDPAddr, proxyConn *net.UDPConn) (*Session, error) {
 	serverConn, err := net.DialUDP("udp", nil, raddr)
 	if err != nil {
 		return nil, err
@@ -34,36 +33,12 @@ func newSession(caddr *net.UDPAddr, raddr *net.UDPAddr, proxyConn *net.UDPConn)
 	return session, nil
 }
 
-func (s *Session) isRconRequestPacket(buf []byte) bool {
-	return string(buf[:8]) == "\xff\xff\xff\xffrcon"
-}
-
-func (s *Session) isQueryRequestPacket(buf []byte) bool {
-	return string(buf[:13]) == "\xff\xff\xff\xffgetstatus" || string(buf[:11]) == "\xff\xff\xff\xffgetinfo"
-}
-
-func (s *Session) isValidRequestPacket(buf []byte) bool {
-	return s.isRconRequestPacket(buf) || s.isQueryRequestPacket(buf)
-}
-
-func (s *Session) isRconResponsePacket(buf []byte) bool {
-	return string(buf[:9]) == "\xff\xff\xff\xffprint"
-}
-
-func (s *Session) isQueryResponsePacket(buf []byte) bool {
-	return string(buf[:18]) == "\xff\xff\xff\xffstatusResponse" || string(buf[:16]) == "\xff\xff\xff\xffinfoResponse"
-}
-
-func (s *Session) isValidResponsePacket(buf []byte) bool {
-	return s.isRconResponsePacket(buf) || s.isQueryResponsePacket(buf)
-}
-
 func (s *Session) listen() error {
 	for {
 		buf := make([]byte, 2048)
 		n, err := s.serverConn.Read(buf)
 		if err != nil {
-			log.Error(err)
+			log.Println(err)
 			continue
 		}
 
@@ -72,44 +47,28 @@ func (s *Session) listen() error {
 }
 
 func (s *Session) proxyFrom(buf []byte) error {
-	if !s.isValidResponsePacket(buf) {
-		err := errors.New("not a rcon or query response packet")
-		log.Error(err.Error())
-		return err
-	}
-
 	s.updateTime = time.Now()
 	_, err := s.proxyConn.WriteToUDP(buf, s.caddr)
 	if err != nil {
-		log.Error(err)
+		log.Println(err)
 		return err
 	}
 
-	if s.isRconResponsePacket(buf) && log.GetLevel() == log.DebugLevel {
-		parts := strings.Split(string(buf[10:]), " ")
-		log.Debugf("Response: %s", strings.Join(parts, " "))
-	}
-
 	return nil
 }
 
 func (s *Session) proxyTo(buf []byte) error {
-	if !s.isValidRequestPacket(buf) {
-		err := errors.New("not a rcon or query request packet")
-		log.Error(err.Error())
-		return err
-	}
-
 	s.updateTime = time.Now()
 	_, err := s.serverConn.Write(buf)
 	if err != nil {
-		log.Error(err)
+		log.Println(err)
 		return err
 	}
 
-	if s.isRconRequestPacket(buf) {
-		parts := strings.Split(string(buf), " ")
-		log.Infof("From [%s] To [%s] Command: %s", s.caddr.IP.String(), s.serverConn.RemoteAddr().String(), strings.Join(parts[2:], " "))
+	cmd := string(buf)
+	if cmd[:8] == "\xff\xff\xff\xffrcon" {
+		parts := strings.Split(cmd, " ")
+		log.Info("From [", s.caddr.IP, "] To [", s.serverConn.RemoteAddr().String(), "] Command: ", strings.Join(parts[2:], " "))
 	}
 
 	return nil

pkg/udpproxy/udpproxy.go

@@ -37,6 +37,10 @@ func New(port, target string) (*Client, error) {
 	}, nil
 }
 
+func (c *Client) isValidPacket(header []byte) bool {
+	return string(header[:8]) == "\xff\xff\xff\xffrcon" || string(header[:13]) == "\xff\xff\xff\xffgetstatus" || string(header[:11]) == "\xff\xff\xff\xffgetinfo"
+}
+
 func (c *Client) ListenAndServe() error {
 	var err error
 	c.proxyConn, err = net.ListenUDP("udp", c.laddr)
@@ -50,14 +54,18 @@ func (c *Client) ListenAndServe() error {
 		buf := make([]byte, 2048)
 		n, caddr, err := c.proxyConn.ReadFromUDP(buf)
 		if err != nil {
-			log.Error(err)
+			log.Println(err)
+		}
+
+		if !c.isValidPacket(buf[:16]) {
+			continue
 		}
 
 		session, found := c.sessions[caddr.String()]
 		if !found {
-			session, err = newSession(caddr, c.raddr, c.proxyConn)
+			session, err = createSession(caddr, c.raddr, c.proxyConn)
 			if err != nil {
-				log.Error(err)
+				log.Println(err)
 				continue
 			}