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preset_packets.go
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preset_packets.go
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package liter
import (
"crypto/rsa"
"crypto/x509"
"fmt"
"io"
"strings"
"github.com/google/uuid"
)
const (
NextPingState = 1
NextLoginState = 2
)
// It's on purpose that `HandshakePkt` didn't implement `Packet` interface
// To prevent accidently call with `Conn.SendPkt` or `Conn.RecvPkt`
// If you want to handle it, please use `Conn.SendHandshakePkt` or `Conn.RecvHandshakePkt` instead
type HandshakePkt struct {
Protocol int
Addr string
Addition string
Port uint16
NextState VarInt
}
func (p HandshakePkt) String() string {
if len(p.Addition) == 0 {
return fmt.Sprintf("<HandshakePkt protocol=%d addr=%s port=%d nextState=%d>", p.Protocol, p.Addr, p.Port, p.NextState)
}
return fmt.Sprintf("<HandshakePkt protocol=%d addr=%s + %q port=%d nextState=%d>", p.Protocol, p.Addr, p.Addition, p.Port, p.NextState)
}
func (p HandshakePkt) EncodeTo(b *PacketBuilder) {
b.
VarInt((VarInt)(p.Protocol)).
String(p.Addr + p.Addition).
Short((Short)(p.Port)).
VarInt(p.NextState)
}
func (p *HandshakePkt) Decode(r *PacketReader) (err error) {
var ok bool
var v VarInt
if v, ok = r.VarInt(); !ok {
return io.EOF
}
p.Protocol = (int)(v)
if p.Addr, ok = r.String(); !ok {
return io.EOF
}
if i := strings.IndexByte(p.Addr, '\x00'); i != -1 {
p.Addition = p.Addr[i:]
p.Addr = p.Addr[:i]
}
if p.Port, ok = r.Uint16(); !ok {
return io.EOF
}
if p.NextState, ok = r.VarInt(); !ok {
return io.EOF
}
return
}
////////////////////////////
//// BEGIN PING PACKETS ////
////////////////////////////
type StatusRequestPkt struct{}
var _ Packet = (*StatusRequestPkt)(nil)
func (p StatusRequestPkt) String() string { return "<StatusRequestPkt>" }
func (p StatusRequestPkt) Encode(b *PacketBuilder) {}
func (p *StatusRequestPkt) DecodeFrom(r *PacketReader) (err error) { return }
type PlayerInfo struct {
Name string `json:"name"`
Id UUID `json:"id"`
}
type (
StatusResponsePayload struct {
Version ProtocolVersion `json:"version"`
Players PlayerStatus `json:"players"`
Description *Chat `json:"description"`
}
ProtocolVersion struct {
Name string `json:"name"`
Protocol int `json:"protocol"`
}
PlayerStatus struct {
Max int `json:"max"`
Online int `json:"online"`
Sample []PlayerInfo `json:"sample,omitempty"`
}
)
type StatusResponsePkt struct {
Payload StatusResponsePayload
}
var _ Packet = (*StatusResponsePkt)(nil)
func (p StatusResponsePkt) String() string {
return "<StatusResponsePkt>"
}
func (p StatusResponsePkt) Encode(b *PacketBuilder) {
b.
JSON(p.Payload)
}
func (p *StatusResponsePkt) DecodeFrom(r *PacketReader) (err error) {
if err = r.JSON(&p.Payload); err != nil {
return
}
return
}
type PingRequestPkt struct {
Payload int64
}
var _ Packet = (*PingRequestPkt)(nil)
func (p PingRequestPkt) String() string {
return fmt.Sprintf("<PingRequestPkt payload=%d>", p.Payload)
}
func (p PingRequestPkt) Encode(b *PacketBuilder) {
b.
Long(p.Payload)
}
func (p *PingRequestPkt) DecodeFrom(r *PacketReader) (err error) {
var ok bool
if p.Payload, ok = r.Long(); !ok {
return io.EOF
}
return
}
type PingResponsePkt struct {
Payload int64
}
var _ Packet = (*PingResponsePkt)(nil)
func (p PingResponsePkt) String() string {
return fmt.Sprintf("<PingResponsePkt payload=%d>", p.Payload)
}
func (p PingResponsePkt) Encode(b *PacketBuilder) {
b.
Long(p.Payload)
}
func (p *PingResponsePkt) DecodeFrom(r *PacketReader) (err error) {
var ok bool
if p.Payload, ok = r.Long(); !ok {
return io.EOF
}
return
}
/////////////////////////////
//// BEGIN LOGIN PACKETS ////
/////////////////////////////
// See: https://wiki.vg/Protocol#Login
// See: https://wiki.vg/Protocol_Encryption
// ID=0x00; Clientbound
type DisconnectPkt struct {
Reason *Chat
}
var _ Packet = (*DisconnectPkt)(nil)
func (p DisconnectPkt) Encode(b *PacketBuilder) {
b.Chat(p.Reason)
}
func (p *DisconnectPkt) DecodeFrom(r *PacketReader) (err error) {
if p.Reason, err = r.Chat(); err != nil {
return
}
return
}
// ID=0x02; Clientbound
type LoginSuccessPkt struct {
// Before 1.16: Unlike in other packets, this field contains the UUID as a string with hyphens.
UUID UUID
Username string
Properties []*Property
}
var _ Packet = (*LoginSuccessPkt)(nil)
func (p *LoginSuccessPkt) Encode(b *PacketBuilder) {
protocol := b.Protocol()
if protocol >= V1_16_3 {
b.UUID(p.UUID)
} else {
b.String(p.UUID.String())
}
b.String(p.Username)
if protocol >= V1_19 {
b.VarInt((VarInt)(len(p.Properties)))
for _, v := range p.Properties {
v.Encode(b)
}
}
}
func (p *LoginSuccessPkt) DecodeFrom(r *PacketReader) (err error) {
protocol := r.Protocol()
var ok bool
if protocol >= V1_16_3 {
if p.UUID, ok = r.UUID(); !ok {
return io.EOF
}
} else {
var id string
if id, ok = r.String(); !ok {
return io.EOF
}
if p.UUID, err = uuid.Parse(id); err != nil {
return
}
}
if p.Username, ok = r.String(); !ok {
return io.EOF
}
if protocol >= V1_19 {
var n VarInt
if n, ok = r.VarInt(); !ok {
return io.EOF
}
p.Properties = make([]*Property, n)
for i, _ := range p.Properties {
v := new(Property)
if err = v.DecodeFrom(r); err != nil {
return
}
p.Properties[i] = v
}
}
return
}
// ID=0x03; Clientbound
type LoginSetCompressionPkt struct {
Threshold VarInt // Maximum size of a packet before it is compressed.
}
var _ Packet = (*LoginSetCompressionPkt)(nil)
func (p LoginSetCompressionPkt) Encode(b *PacketBuilder) {
b.VarInt(p.Threshold)
}
func (p *LoginSetCompressionPkt) DecodeFrom(r *PacketReader) (err error) {
var ok bool
if p.Threshold, ok = r.VarInt(); !ok {
return io.EOF
}
return
}
// ID=0x04; Clientbound
type LoginEncryptionRequestPkt struct {
ServerID string // Appears to be empty.
PublicKey *rsa.PublicKey // encoded in ASN.1 DER format
/* A sequence of random bytes generated by the server.
* Length of Verify Token is always 4 for Notchian servers. */
VerifyToken ByteArray
}
var _ Packet = (*LoginEncryptionRequestPkt)(nil)
func (p LoginEncryptionRequestPkt) Encode(b *PacketBuilder) {
b.String(p.ServerID)
pubKey, _ := x509.MarshalPKIXPublicKey(p.PublicKey)
b.VarInt((VarInt)(len(pubKey)))
b.ByteArray(pubKey)
b.VarInt((VarInt)(len(p.VerifyToken)))
b.ByteArray(p.VerifyToken)
}
func (p *LoginEncryptionRequestPkt) DecodeFrom(r *PacketReader) (err error) {
var ok bool
var n VarInt
if p.ServerID, ok = r.String(); !ok {
return io.EOF
}
if n, ok = r.VarInt(); !ok {
return io.EOF
}
pubKey := make(ByteArray, n)
if ok = r.ByteArray(pubKey); !ok {
return io.EOF
}
var key any
if key, err = x509.ParsePKIXPublicKey(pubKey); err != nil {
return
}
if p.PublicKey, ok = key.(*rsa.PublicKey); !ok {
return fmt.Errorf("Unexpected public key type %T when parsing login encryption request", key)
}
if n, ok = r.VarInt(); !ok {
return io.EOF
}
p.VerifyToken = make(ByteArray, n)
if ok = r.ByteArray(p.VerifyToken); !ok {
return io.EOF
}
return
}
// ID=0x00; Serverbound
type LoginStartPkt struct {
Name string
// if protocol >= 1.19 && protocol <= 1.19.2
HasSign bool
Timestamp Long
PublicKey ByteArray
Sign ByteArray
// if protocol >= 1.19.1
Id Optional[UUID]
}
var _ Packet = (*LoginStartPkt)(nil)
func (p LoginStartPkt) String() string {
if p.Id.Ok {
return fmt.Sprintf("<LoginStartPkt name=%s uuid=%v>", p.Name, p.Id.V)
}
return fmt.Sprintf("<LoginStartPkt name=%s>", p.Name)
}
func (p LoginStartPkt) Encode(b *PacketBuilder) {
protocol := b.Protocol()
b.String(p.Name)
if protocol >= V1_19 {
if protocol <= V1_19_2 {
b.Bool(p.HasSign)
if p.HasSign {
b.
Long(p.Timestamp).
VarInt((VarInt)(len(p.PublicKey))).
ByteArray(p.PublicKey).
VarInt((VarInt)(len(p.Sign))).
ByteArray(p.Sign)
}
}
if protocol >= V1_19_2 {
b.Bool(p.Id.Ok)
if p.Id.Ok {
b.UUID(p.Id.V)
}
}
}
}
func (p *LoginStartPkt) DecodeFrom(r *PacketReader) (err error) {
protocol := r.Protocol()
var ok bool
if p.Name, ok = r.String(); !ok {
return io.EOF
}
if protocol >= V1_19 {
if protocol <= V1_19_2 {
if p.HasSign, ok = r.Bool(); !ok {
return io.EOF
}
if p.HasSign {
if p.Timestamp, ok = r.Long(); !ok {
return io.EOF
}
var n VarInt
if n, ok = r.VarInt(); !ok {
return io.EOF
}
p.PublicKey = make(ByteArray, n)
if ok = r.ByteArray(p.PublicKey); !ok {
return io.EOF
}
if n, ok = r.VarInt(); !ok {
return io.EOF
}
p.Sign = make(ByteArray, n)
if ok = r.ByteArray(p.Sign); !ok {
return io.EOF
}
}
}
if protocol >= V1_19_2 {
if p.Id.Ok, ok = r.Bool(); !ok {
return io.EOF
}
if p.Id.Ok {
if p.Id.V, ok = r.UUID(); !ok {
return io.EOF
}
}
}
}
return
}
// ID=0x01; Serverbound
type LoginEncryptionResponsePkt struct {
SharedSecret ByteArray // Shared Secret value, encrypted with the server's public key.
VerifyToken ByteArray // Verify Token value, encrypted with the same public key as the shared secret.
}
var _ Packet = (*LoginEncryptionResponsePkt)(nil)
func (p LoginEncryptionResponsePkt) Encode(b *PacketBuilder) {
b.VarInt((VarInt)(len(p.SharedSecret)))
b.ByteArray(p.SharedSecret)
b.VarInt((VarInt)(len(p.VerifyToken)))
b.ByteArray(p.VerifyToken)
}
func (p *LoginEncryptionResponsePkt) DecodeFrom(r *PacketReader) (err error) {
var ok bool
var n VarInt
if n, ok = r.VarInt(); !ok {
return io.EOF
}
p.SharedSecret = make(ByteArray, n)
if ok = r.ByteArray(p.SharedSecret); !ok {
return io.EOF
}
if n, ok = r.VarInt(); !ok {
return io.EOF
}
p.VerifyToken = make(ByteArray, n)
if ok = r.ByteArray(p.VerifyToken); !ok {
return io.EOF
}
return
}
// ID=0x03; Serverbound; not before 1.20.2
type LoginAcknowledgedPkt struct{}
var _ Packet = (*LoginAcknowledgedPkt)(nil)
func (p LoginAcknowledgedPkt) String() string { return "<LoginAcknowledgedPkt>" }
func (p LoginAcknowledgedPkt) Encode(b *PacketBuilder) {}
func (p *LoginAcknowledgedPkt) DecodeFrom(r *PacketReader) (err error) { return }