func ConfReload() {
// Do not panic!
defer func() {
if r := recover(); r != nil {
log.Errorf("paniced when reloading config %s, recovered.", config_file)
log.Errorf("panic: %s", r)
}
}()
log.Warn("Reloading config")
content, err := ioutil.ReadFile(config_file)
if err != nil {
log.Errorf("unable to reload config %s: %s", config_file, err.Error())
return
}
prev_listen := config.Listen_addr
config_lock.Lock()
err = yaml.Unmarshal(content, &config)
if err != nil {
log.Errorf("error when parsing config file %s: %s", config_file, err.Error())
return
}
validateConfig()
config_lock.Unlock()
log.Info("config reloaded.")
if config.Listen_addr != prev_listen {
log.Warnf("config reload will not reopen server socket, thus no effect on listen address")
}
log.Infof("%d upstream server(s) found", len(config.Upstream))
}
func RejectHandler(conn *WrapedSocket, initial_pkt *mcproto.MCHandShake, e *mcchat.ChatMsg) {
if initial_pkt.NextState == 1 {
conn.Infof("ping packet")
pkt, err := mcproto.ReadPacket(conn)
if err != nil {
conn.Errorf("Error when reading status request: %s", err.Error())
conn.Close()
return
}
if !pkt.IsStatusRequest() {
conn.Errorf("Invalid protocol: no status request.")
conn.Close()
return
}
conn.Debugf("status: request")
resp := new(mcproto.MCStatusResponse)
resp.Description = e
resp.Version.Name = "minegate"
resp.Version.Protocol = 0
resp_pkt, err := resp.ToRawPacket()
if err != nil {
conn.Errorf("Unable to make packet: %s", err.Error())
conn.Close()
return
}
_, err = conn.Write(resp_pkt.ToBytes())
if err != nil {
log.Errorf("Unable to write response: %s", err.Error())
conn.Close()
return
}
pkt, err = mcproto.ReadPacket(conn)
if err != nil {
if err != io.EOF {
log.Errorf("Unable to read packet: %s", err.Error())
}
conn.Close()
return
}
if !pkt.IsStatusPing() {
log.Error("Invalid protocol: no status ping.")
conn.Close()
return
}
conn.Write(pkt.ToBytes()) // Don't care now.
} else {
log.Info("login packet")
kick_pkt := (*mcproto.MCKick)(e)
raw_pkt, err := kick_pkt.ToRawPacket()
if err != nil {
log.Errorf("Unable to make packet: %s", err.Error())
conn.Close()
return
}
// Don't care now
conn.Write(raw_pkt.ToBytes())
}
conn.Close()
return
}
func Run() {
PreLoadConfig()
confInit()
PostLoadConfig()
runtime.GOMAXPROCS(runtime.NumCPU())
log.Infof("MineGate %s started.", version_full)
go ServerSocket()
sig := make(chan os.Signal, 1)
signal.Notify(sig, syscall.SIGHUP, syscall.SIGUSR1)
for {
cur := <-sig
switch cur {
case syscall.SIGHUP:
log.Warn("SIGHUP caught, reloading config...")
PreLoadConfig()
ConfReload()
PostLoadConfig()
case syscall.SIGUSR1:
log.Warn("SIGUSR1 caught, rotating log...")
log.Rotate()
default:
log.Errorf("Trapped unexpected signal: %s", cur.String())
continue
}
}
}
func (upstream *Upstream) Validate() (valid bool) {
var host, port string
host, port, err := net.SplitHostPort(upstream.Server)
if err != nil {
server := upstream.Server + ":25565"
if host, port, err = net.SplitHostPort(server); err != nil {
log.Error("Invalid upstream server: " + upstream.Server)
return false
}
log.Infof("no port information found in %s, assume 25565", upstream.Server)
upstream.Server = server
}
p, err := strconv.ParseUint(port, 10, 16)
if err != nil {
log.Errorf("Invalid port %s: %s", port, err.Error())
return false
}
host = strings.ToLower(host)
if !CheckHost(host) {
log.Error("Invalid upstream host: " + host)
return false
}
upstream.Server = net.JoinHostPort(host, fmt.Sprintf("%d", p))
upstream.Pattern = strings.ToLower(upstream.Pattern)
if !CheckPattern(upstream.Pattern) {
log.Error("Invalid pattern: " + upstream.Pattern)
return false
}
if upstream.ErrorMsg.Text == "" {
log.Warnf("Empty error text for %s, use default string", upstream.Server)
upstream.ErrorMsg.Text = "Connection failed to " + upstream.Server
}
upstream.ChatMsg = ToChatMsg(&upstream.ErrorMsg)
return true
}
func (upstream *Upstream) GetExtra(path string) (val interface{}, err error) {
defer func() {
if r := recover(); r != nil {
log.Errorf("Recovered panic: upstream.GetExtra(%s), err=%+v", path, r)
log.Debugf("Upstream: %+v", upstream)
val = nil
err = errors.New("panic when getting config.")
return
}
}()
paths := strings.Split(path, ".")
cur := reflect.ValueOf(upstream.Extras)
// ROOT can't be an array, so assume no config path starts with #
for _, path := range paths {
index := strings.Split(path, "#")
prefix, index := index[0], index[1:]
if cur.Kind() != reflect.Map {
log.Warnf("upstream.GetExtra(%s): unable to fetch key %s, not a map.", path, prefix)
return nil, fmt.Errorf("index key on non-map type")
}
cur = reflect.ValueOf(cur.MapIndex(reflect.ValueOf(prefix)).Interface())
for _, idx := range index {
i, err := strconv.ParseInt(idx, 0, 0)
if err != nil {
log.Errorf("upstream.GetExtra(%s): unable to parse %s: %s", path, idx, err.Error())
return nil, fmt.Errorf("Unable to parse %s: %s", idx, err.Error())
}
if cur.Kind() != reflect.Slice {
log.Warnf("upstream.GetExtra(%s): unable to index value, not a slice", path)
return nil, errors.New("Unable to index value, not a slice.")
}
if int(i) >= cur.Len() {
log.Warnf("upstream.GetExtra(%s): index %d out of range", path, i)
return nil, errors.New("Index out of range.")
}
cur = reflect.ValueOf(cur.Index(int(i)).Interface())
}
}
return cur.Interface(), nil
}
func OnDisconnect(handle DisconnectFunc, priority int) (err error) {
if priority < 0 || priority > 39 {
log.Errorf("Invalid priority %d: not in range [0, 39]", priority)
return fmt.Errorf("priority check failure: %d not in range [0, 39]", priority)
}
if handle == nil {
log.Error("Attempt to register nil handler")
return errors.New("Nil handler!")
}
if disconnectHandlers[priority] == nil {
disconnectHandlers[priority] = make(disconnectHandler, 0, 16)
}
disconnectHandlers[priority] = append(disconnectHandlers[priority], handle)
log.Infof("Registered disconnect handler at priority %d", priority)
return nil
}
func OnPreStatusResponse(handle PreStatusResponseFunc, priority int) (err error) {
if priority < 0 || priority > 39 {
log.Errorf("Invalid priority %d: not in range [0, 39]", priority)
return fmt.Errorf("priority check failure: %d not in range [0, 39]", priority)
}
if handle == nil {
log.Error("Attempt to register nil handler")
return errors.New("Nil handler!")
}
if preStatusResponseHandlers[priority] == nil {
preStatusResponseHandlers[priority] = make(preStatusResponseHandler, 0, 16)
}
preStatusResponseHandlers[priority] = append(preStatusResponseHandlers[priority], handle)
log.Infof("Registered preStatusResponse handler at priority %d", priority)
return nil
}
func OnStartProxy(handle StartProxyFunc, priority int) (err error) {
if priority < 0 || priority > 39 {
log.Errorf("Invalid priority %d: not in range [0, 39]", priority)
return fmt.Errorf("priority check failure: %d not in range [0, 39]", priority)
}
if handle == nil {
log.Error("Attempt to register nil handler")
return errors.New("Nil handler!")
}
if startProxyHandlers[priority] == nil {
startProxyHandlers[priority] = make(startProxyHandler, 0, 16)
}
startProxyHandlers[priority] = append(startProxyHandlers[priority], handle)
log.Infof("Registered startProxy handler at priority %d", priority)
return nil
}
func OnLoginRequest(handle LoginRequestFunc, priority int) (err error) {
if priority < 0 || priority > 39 {
log.Errorf("Invalid priority %d: not in range [0, 39]", priority)
return fmt.Errorf("priority check failure: %d not in range [0, 39]", priority)
}
if handle == nil {
log.Error("Attempt to register nil handler")
return errors.New("Nil handler!")
}
if loginRequestHandlers[priority] == nil {
loginRequestHandlers[priority] = make(loginRequestHandler, 0, 16)
}
loginRequestHandlers[priority] = append(loginRequestHandlers[priority], handle)
log.Infof("Registered pingRequest handler at priority %d", priority)
return nil
}
func userLogout(event *minegate.DisconnectEvent) {
defer func() {
if r := recover(); r != nil {
log.Errorf("[conntrack] Recovered from panic. Programming error inside plugin. Please contact author ASAP!")
}
}()
connID := event.GetConnID()
ollock.Lock()
defer ollock.Unlock()
info, ok := conn_in[connID]
if !ok {
return
}
delete(conn_in, connID)
online_list[info.Server].Remove(info.User)
event.Infof("[conntrack] User %s logout from server %s.", info.User, info.Server)
event.Infof("[conntrack] Upstream online user: %d. Total online user: %d", online_list[info.Server].Cardinality(), len(conn_in))
}
func validateConfig() {
invalid_upstreams := make([]int, 0, len(config.Upstream))
for idx, upstream := range config.Upstream {
if !upstream.Validate() {
log.Errorf("Upstream %s is not activated.", upstream.Server)
invalid_upstreams = append(invalid_upstreams, idx)
}
}
for delta, idx := range invalid_upstreams {
idx -= delta
config.Upstream[idx] = nil
config.Upstream = append(config.Upstream[:idx], config.Upstream[idx+1:]...)
}
if config.NotFound.Text == "" {
log.Warn("Empty error text for not found error, use default string")
config.NotFound.Text = "No such host."
}
config.chatNotFound = ToChatMsg(&config.NotFound)
}
func confInit() {
content, err := ioutil.ReadFile(config_file)
if err != nil {
log.Fatalf("unable to load config %s: %s", config_file, err.Error())
}
err = yaml.Unmarshal(content, &config)
if err != nil {
log.Fatalf("error when parsing config file %s: %s", config_file, err.Error())
}
validateConfig()
if config.Log.Target != "" && config.Log.Target != "-" {
config.Log.Target, _ = filepath.Abs(config.Log.Target)
log.Info("log path: " + config.Log.Target)
}
log.Stop()
if config.Daemonize {
Daemonize()
}
log.Start()
if config.Log.Level != "" {
level := log.ToLevel(config.Log.Level)
if level == log.INVALID {
log.Errorf("Invalid log level %s", config.Log.Level)
} else {
log.SetLogLevel(level)
}
}
if config.Log.Target != "" && config.Log.Target != "-" {
err := log.Open(config.Log.Target)
if err != nil {
log.Fatalf("Unable to open log %s: %s", config.Log.Target, err.Error())
}
}
log.Info("config loaded.")
log.Info("server listen on: " + config.Listen_addr)
log.Infof("%d upstream server(s) found", len(config.Upstream))
}
func (event *NetworkEvent) Errorf(format string, v ...interface{}) {
if event.log_prefix == "" {
event.log_prefix = fmt.Sprintf("[#%d %s]", event.connID, event.RemoteAddr)
}
log.Errorf(event.log_prefix+format, v...)
}
func (ws *WrapedSocket) Errorf(format string, v ...interface{}) {
log.Errorf(ws.log_prefix+format, v...)
}
func proxy(conn *WrapedSocket, upstream *Upstream, initial_pkt *mcproto.MCHandShake, ne *PostAcceptEvent) {
addr, perr := net.ResolveTCPAddr("tcp", upstream.Server)
var err error
var upsock *net.TCPConn
if perr == nil {
upsock, err = net.DialTCP("tcp", nil, addr)
}
if err != nil || perr != nil {
if err == nil {
err = perr
}
log.Errorf("Unable to connect to upstream %s", upstream.Server)
RejectHandler(conn, initial_pkt, upstream.ChatMsg)
return
}
upconn := WrapUpstreamSocket(upsock, conn)
if initial_pkt.NextState == 1 {
// Handle ping here.
conn.Debugf("ping proxy")
pre := new(PingRequestEvent)
pre.NetworkEvent = ne.NetworkEvent
pre.Packet = initial_pkt
pre.Upstream = upstream
PingRequest(pre)
if pre.Rejected() {
if pre.reason == "" {
conn.Warnf("Ping request was rejected.")
pre.reason = "Request was rejected by plugin."
} else {
conn.Warnf("Ping request was rejected: %s", pre.reason)
}
e := mcchat.NewMsg(pre.reason)
e.SetColor(mcchat.RED)
e.SetBold(true)
RejectHandler(conn, initial_pkt, e)
return
}
init_raw, err := initial_pkt.ToRawPacket()
if err != nil {
log.Errorf("Unable to encode initial packet: %s", err.Error())
conn.Close()
upconn.Close()
return
}
pkt, err := mcproto.ReadPacket(conn)
if err != nil {
conn.Errorf("Error when reading status request: %s", err.Error())
conn.Close()
upconn.Close()
return
}
if !pkt.IsStatusRequest() {
conn.Errorf("Invalid protocol: no status request.")
conn.Close()
upconn.Close()
return
}
_, err = upconn.Write(init_raw.ToBytes())
if err == nil {
_, err = upconn.Write(pkt.ToBytes())
}
if err != nil {
upconn.Errorf("write error: %s", err.Error())
conn.Close()
upconn.Close()
return
}
resp_pkt, err := mcproto.ReadPacket(upconn)
if err != nil {
upconn.Errorf("invalid packet: %s", err.Error())
conn.Close()
upconn.Close()
return
}
resp, err := resp_pkt.ToStatusResponse()
if err != nil {
upconn.Errorf("invalid packet: %s", err.Error())
conn.Close()
upconn.Close()
return
}
psre := new(PreStatusResponseEvent)
psre.NetworkEvent = ne.NetworkEvent
psre.Packet = resp
psre.Upstream = upstream
PreStatusResponse(psre)
resp_pkt, err = resp.ToRawPacket()
if err != nil {
conn.Errorf("invalid packet: %s", err.Error())
conn.Close()
upconn.Close()
return
}
// We can handle ping request, close upstream
upconn.Close()
_, err = conn.Write(resp_pkt.ToBytes())
if err != nil {
conn.Errorf("write error: %s", err.Error())
conn.Close()
return
}
ping_pkt, err := mcproto.ReadPacket(conn)
if err != nil || !ping_pkt.IsStatusPing() {
if err == nil {
err = errors.New("packet is not ping")
}
conn.Errorf("invalid packet: %s", err.Error())
conn.Close()
return
}
_, err = conn.Write(ping_pkt.ToBytes())
conn.Close()
} else {
// Handle login here.
conn.Debugf("login proxy")
login_raw, err := mcproto.ReadPacket(conn)
if err != nil {
conn.Errorf("Read login packet: %s", err.Error())
conn.Close()
return
}
login_pkt, err := login_raw.ToLogin()
if err != nil {
conn.Errorf("invalid packet: %s", err.Error())
conn.Close()
return
}
lre := new(LoginRequestEvent)
lre.NetworkEvent = ne.NetworkEvent
lre.InitPacket = initial_pkt
lre.LoginPacket = login_pkt
lre.Upstream = upstream
LoginRequest(lre)
if lre.Rejected() {
if lre.reason == "" {
conn.Warnf("Ping request was rejected.")
lre.reason = "Request was rejected by plugin."
} else {
conn.Warnf("Ping request was rejected: %s", lre.reason)
}
e := mcchat.NewMsg(lre.reason)
e.SetColor(mcchat.RED)
e.SetBold(true)
RejectHandler(conn, initial_pkt, e)
return
}
init_raw, err := initial_pkt.ToRawPacket()
if err != nil {
log.Errorf("Unable to encode initial packet: %s", err.Error())
conn.Close()
return
}
login_raw, err = login_pkt.ToRawPacket()
if err != nil {
log.Errorf("Unable to encode login packet: %s", err.Error())
conn.Close()
return
}
_, err = upconn.Write(init_raw.ToBytes())
if err == nil {
upconn.Write(login_raw.ToBytes())
}
if err != nil {
upconn.Errorf("write error: %s", err.Error())
}
spe := new(StartProxyEvent)
spe.Upstream = upstream
spe.NetworkEvent = ne.NetworkEvent
spe.InitPacket = initial_pkt
spe.LoginPacket = login_pkt
StartProxy(spe)
go PipeIt(conn, upconn)
go PipeIt(upconn, conn)
}
}