265 lines
5.9 KiB
Go
265 lines
5.9 KiB
Go
package utils
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import (
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"context"
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"errors"
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"fmt"
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"net"
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"strings"
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"sync"
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"github.com/sandertv/gophertunnel/minecraft"
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"github.com/sandertv/gophertunnel/minecraft/protocol"
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"github.com/sandertv/gophertunnel/minecraft/protocol/packet"
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"github.com/sandertv/gophertunnel/minecraft/resource"
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"github.com/sirupsen/logrus"
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)
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var G_disconnect_reason = "Connection lost"
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type dummyProto struct {
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id int32
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ver string
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}
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func (p dummyProto) ID() int32 { return p.id }
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func (p dummyProto) Ver() string { return p.ver }
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func (p dummyProto) Packets() packet.Pool { return packet.NewPool() }
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func (p dummyProto) ConvertToLatest(pk packet.Packet, _ *minecraft.Conn) []packet.Packet {
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return []packet.Packet{pk}
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}
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func (p dummyProto) ConvertFromLatest(pk packet.Packet, _ *minecraft.Conn) []packet.Packet {
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return []packet.Packet{pk}
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}
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type ProxyContext struct {
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Server *minecraft.Conn
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Client *minecraft.Conn
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Listener *minecraft.Listener
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commands map[string]IngameCommand
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log *logrus.Logger
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// called for every packet
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PacketFunc PacketFunc
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// called after game started
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ConnectCB ConnectCallback
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// called on every packet after login
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PacketCB PacketCallback
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}
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type (
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PacketFunc func(header packet.Header, payload []byte, src, dst net.Addr)
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PacketCallback func(pk packet.Packet, proxy *ProxyContext, toServer bool) (packet.Packet, error)
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ConnectCallback func(proxy *ProxyContext)
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)
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func (p *ProxyContext) SendMessage(text string) {
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if p.Client != nil {
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p.Client.WritePacket(&packet.Text{
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TextType: packet.TextTypeSystem,
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Message: "§8[§bBedrocktool§8]§r " + text,
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})
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}
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}
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func (p *ProxyContext) SendPopup(text string) {
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if p.Client != nil {
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p.Client.WritePacket(&packet.Text{
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TextType: packet.TextTypePopup,
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Message: text,
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})
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}
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}
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type IngameCommand struct {
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Exec func(cmdline []string) bool
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Cmd protocol.Command
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}
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func (p *ProxyContext) AddCommand(cmd IngameCommand) {
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p.commands[cmd.Cmd.Name] = cmd
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}
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func (p *ProxyContext) CommandHandlerPacketCB(pk packet.Packet, proxy *ProxyContext, toServer bool) (packet.Packet, error) {
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switch _pk := pk.(type) {
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case *packet.CommandRequest:
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cmd := strings.Split(_pk.CommandLine, " ")
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name := cmd[0][1:]
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if h, ok := p.commands[name]; ok {
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if h.Exec(cmd[1:]) {
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pk = nil
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}
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}
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case *packet.AvailableCommands:
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cmds := make([]protocol.Command, len(p.commands))
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for _, ic := range p.commands {
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cmds = append(cmds, ic.Cmd)
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}
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pk = &packet.AvailableCommands{
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Constraints: _pk.Constraints,
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Commands: append(_pk.Commands, cmds...),
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}
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}
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return pk, nil
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}
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func proxyLoop(ctx context.Context, proxy *ProxyContext, toServer bool, packetCBs []PacketCallback) error {
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var c1, c2 *minecraft.Conn
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if toServer {
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c1 = proxy.Client
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c2 = proxy.Server
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} else {
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c1 = proxy.Server
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c2 = proxy.Client
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}
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for {
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if ctx.Err() != nil {
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return ctx.Err()
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}
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pk, err := c1.ReadPacket()
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if err != nil {
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return err
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}
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for _, packetCB := range packetCBs {
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pk, err = packetCB(pk, proxy, toServer)
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if err != nil {
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return err
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}
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}
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if pk != nil {
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if err := c2.WritePacket(pk); err != nil {
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if disconnect, ok := errors.Unwrap(err).(minecraft.DisconnectError); ok {
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G_disconnect_reason = disconnect.Error()
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}
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return err
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}
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}
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}
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}
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func NewProxy(log *logrus.Logger) *ProxyContext {
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if log == nil {
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log = logrus.StandardLogger()
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}
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return &ProxyContext{
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log: log,
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commands: make(map[string]IngameCommand),
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}
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}
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var Client_addr net.Addr
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func (p *ProxyContext) Run(ctx context.Context, server_address string) (err error) {
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c := make(chan struct{})
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if strings.HasSuffix(server_address, ".pcap") {
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return fmt.Errorf("not supported anymore")
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}
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if strings.HasSuffix(server_address, ".pcap2") {
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return create_replay_connection(ctx, p.log, server_address, p.ConnectCB, p.PacketCB)
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}
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go func() {
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defer func() { c <- struct{}{} }()
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GetTokenSource() // ask for login before listening
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var packs []*resource.Pack
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if G_preload_packs {
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p.log.Info("Preloading resourcepacks")
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var serverConn *minecraft.Conn
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serverConn, err = ConnectServer(ctx, server_address, nil, true, nil)
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if err != nil {
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err = fmt.Errorf("failed to connect to %s: %s", server_address, err)
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return
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}
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serverConn.Close()
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packs = serverConn.ResourcePacks()
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p.log.Infof("%d packs loaded", len(packs))
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}
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_status := minecraft.NewStatusProvider("Server")
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p.Listener, err = minecraft.ListenConfig{
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StatusProvider: _status,
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ResourcePacks: packs,
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AcceptedProtocols: []minecraft.Protocol{
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dummyProto{id: 544, ver: "1.19.20"},
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},
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}.Listen("raknet", ":19132")
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if err != nil {
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return
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}
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defer p.Listener.Close()
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p.log.Infof("Listening on %s", p.Listener.Addr())
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var c net.Conn
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c, err = p.Listener.Accept()
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if err != nil {
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p.log.Fatal(err)
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}
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p.Client = c.(*minecraft.Conn)
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cd := p.Client.ClientData()
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p.Server, err = ConnectServer(ctx, server_address, &cd, false, p.PacketFunc)
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if err != nil {
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err = fmt.Errorf("failed to connect to %s: %s", server_address, err)
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return
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}
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// spawn and start the game
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if err = spawn_conn(ctx, p.Client, p.Server); err != nil {
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err = fmt.Errorf("failed to spawn: %s", err)
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return
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}
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defer p.Server.Close()
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defer p.Listener.Disconnect(p.Client, G_disconnect_reason)
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if p.ConnectCB != nil {
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p.ConnectCB(p)
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}
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wg := sync.WaitGroup{}
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cbs := []PacketCallback{
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p.CommandHandlerPacketCB,
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}
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if p.PacketCB != nil {
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cbs = append(cbs, p.PacketCB)
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}
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// server to client
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wg.Add(1)
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go func() {
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defer wg.Done()
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if err := proxyLoop(ctx, p, false, cbs); err != nil {
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p.log.Error(err)
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return
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}
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}()
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// client to server
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wg.Add(1)
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go func() {
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defer wg.Done()
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if err := proxyLoop(ctx, p, true, cbs); err != nil {
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p.log.Error(err)
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return
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}
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}()
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wg.Wait()
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}()
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select {
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case <-ctx.Done():
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println("Cancelled")
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return context.Canceled
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case <-c:
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return err
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}
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}
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