add isRconPacket(), isQueryPacket() and isResponsePacket() methods

response packets now logged at Debug level

cmd/q3rcon-proxy/main.go

@@ -2,10 +2,12 @@ package main
 
 import (
 	"fmt"
-	"log"
 	"os"
+	"strconv"
 	"strings"
 
+	log "github.com/sirupsen/logrus"
+
 	"github.com/onyx-and-iris/q3rcon-proxy/pkg/udpproxy"
 )
 
@@ -26,9 +28,21 @@ func start(proxy string) {
 }
 
 var (
-	proxies, host string
+	proxies, host, debug 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 == "" {
@@ -39,6 +53,18 @@ 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

@@ -15,7 +15,7 @@ type Session struct {
 	updateTime time.Time
 }
 
-func createSession(caddr *net.UDPAddr, raddr *net.UDPAddr, proxyConn *net.UDPConn) (*Session, error) {
+func newSession(caddr *net.UDPAddr, raddr *net.UDPAddr, proxyConn *net.UDPConn) (*Session, error) {
 	serverConn, err := net.DialUDP("udp", nil, raddr)
 	if err != nil {
 		return nil, err
@@ -33,6 +33,14 @@ func createSession(caddr *net.UDPAddr, raddr *net.UDPAddr, proxyConn *net.UDPCon
 	return session, nil
 }
 
+func (s *Session) isRconPacket(buf []byte) bool {
+	return string(buf[:8]) == "\xff\xff\xff\xffrcon"
+}
+
+func (s *Session) isResponsePacket(buf []byte) bool {
+	return string(buf[:9]) == "\xff\xff\xff\xffprint"
+}
+
 func (s *Session) listen() error {
 	for {
 		buf := make([]byte, 2048)
@@ -54,6 +62,11 @@ func (s *Session) proxyFrom(buf []byte) error {
 		return err
 	}
 
+	if s.isResponsePacket(buf) {
+		parts := strings.Split(string(buf[10:]), " ")
+		log.Debugf("Response: %s", strings.Join(parts, " "))
+	}
+
 	return nil
 }
 
@@ -65,10 +78,9 @@ func (s *Session) proxyTo(buf []byte) error {
 		return err
 	}
 
-	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:], " "))
+	if s.isRconPacket(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:], " "))
 	}
 
 	return nil

pkg/udpproxy/udpproxy.go

@@ -37,8 +37,16 @@ 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) isRconPacket(buf []byte) bool {
+	return string(buf[:8]) == "\xff\xff\xff\xffrcon"
+}
+
+func (c *Client) isQueryPacket(buf []byte) bool {
+	return string(buf[:13]) == "\xff\xff\xff\xffgetstatus" || string(buf[:11]) == "\xff\xff\xff\xffgetinfo"
+}
+
+func (c *Client) isValidPacket(buf []byte) bool {
+	return c.isRconPacket(buf) || c.isQueryPacket(buf)
 }
 
 func (c *Client) ListenAndServe() error {
@@ -57,13 +65,13 @@ func (c *Client) ListenAndServe() error {
 			log.Println(err)
 		}
 
-		if !c.isValidPacket(buf[:16]) {
+		if !c.isValidPacket(buf[:n]) {
 			continue
 		}
 
 		session, found := c.sessions[caddr.String()]
 		if !found {
-			session, err = createSession(caddr, c.raddr, c.proxyConn)
+			session, err = newSession(caddr, c.raddr, c.proxyConn)
 			if err != nil {
 				log.Println(err)
 				continue