gottdad/packet.go

package main

import (
	"bufio"
	"bytes"
	"encoding/binary"
)

const (
	AdminPacketAdminJoin            = 0
	AdminPacketAdminQuit            = 1
	AdminPacketAdminUpdateFrequency = 2
	AdminPacketAdminPoll            = 3
	AdminPacketAdminChat            = 4
	AdminPacketAdminRCon            = 5
	AdminPacketAdminGamescript      = 6
	AdminPacketAdminPing            = 7
	AdminPacketServerFull           = 100
	AdminPacketServerBanned         = 101
	AdminPacketServerError          = 102
	AdminPacketServerProtocol       = 103
	AdminPacketServerWelcome        = 104
	AdminPacketServerNewgame        = 105
	AdminPacketServerShutdown       = 106
	AdminPacketServerDate           = 107
	AdminPacketServerClientJoin     = 108
	AdminPacketServerClientInfo     = 109
	AdminPacketServerClientUpdate   = 110
	AdminPacketServerClientQuit     = 111
	AdminPacketServerClientError    = 112
	AdminPacketServerCompanyNew     = 113
	AdminPacketServerCompanyInfo    = 114
	AdminPacketServerCompanyUpdate  = 115
	AdminPacketServerCompanyRemove  = 116
	AdminPacketServerCompanyEconomy = 117
	AdminPacketServerCompanyStats   = 118
	AdminPacketServerChat           = 119
	AdminPacketServerRCon           = 120
	AdminPacketServerConsole        = 121
	AdminPacketServerCmdNames       = 122
	AdminPacketServerCmdLogging     = 123
	AdminPacketServerGamescript     = 124
	AdminPacketServerRConEnd        = 125
	AdminPacketServerPong           = 126
	InvalidAdminPacket              = 255
)

type Packet struct {
	PLength uint16
	PType   uint8
}

type PacketAdminJoin struct {
	Packet
	Password   string
	AppName    string
	AppVersion string
}

type PacketAdminServerProtocol struct {
	Packet
	ProtocolVersion    uint8
	FurtherData        bool
	UpdatePacketType   uint16
	FrequenciesAllowed uint16
}

type PacketAdminServerWelcome struct {
	Packet
	ServerName     string
	OpenTTDVersion string
	Dedicated      bool
	MapName        string
	MapSeed        uint32
	MapLandscape   uint8
	MapStartDate   uint32
	MapX           uint16
	MapY           uint16
}

func (p *PacketAdminJoin) Bytes() []byte {
	buf := new(bytes.Buffer)
	p.PLength = uint16(len(p.Password) + len(p.AppName) + len(p.AppVersion) + 6)

	binary.Write(buf, binary.LittleEndian, p.PLength)
	binary.Write(buf, binary.LittleEndian, p.PType)
	buf.WriteString(p.Password)
	buf.WriteByte(0)
	buf.WriteString(p.AppName)
	buf.WriteByte(0)
	buf.WriteString(p.AppVersion)
	buf.WriteByte(0)

	return buf.Bytes()
}

func (p *PacketAdminServerWelcome) Read(b []byte) {
	r := bufio.NewReader(bytes.NewReader(b))
	r.Discard(3)
	p.ServerName, _ = r.ReadString(0)
	p.OpenTTDVersion, _ = r.ReadString(0)
	c, _ := r.ReadByte()
	if c > 0 {
		p.Dedicated = true
	} else {
		p.Dedicated = false
	}
	p.MapName, _ = r.ReadString(0)
	bs := make([]byte, 13)
	_, _ = r.Read(bs)
	p.MapSeed = binary.LittleEndian.Uint32(bs[0:])
	r.Discard(4)
	c, _ = r.ReadByte()
	p.MapLandscape = uint8(c)
	p.MapStartDate = binary.LittleEndian.Uint32(bs[5:])
	p.MapX = binary.LittleEndian.Uint16(bs[9:])
	p.MapY = binary.LittleEndian.Uint16(bs[11:])
}

func (p *PacketAdminServerProtocol) Read(b []byte) {
	r := bufio.NewReader(bytes.NewReader(b))
	r.Discard(3)
	c, _ := r.ReadByte()
	p.ProtocolVersion = uint8(c)
	c, _ = r.ReadByte()
	if c > 0 {
		p.FurtherData = true
	} else {
		p.FurtherData = false
	}
	bs := make([]byte, 13)
	_, _ = r.Read(bs)
	p.UpdatePacketType = binary.LittleEndian.Uint16(bs[0:])
	p.FrequenciesAllowed = binary.LittleEndian.Uint16(bs[2:])
}

func handlePacket(p Packet, b []byte) {
	switch p.PType {
	case AdminPacketServerProtocol:
		logInfoDebug("AdminPacketServerProtocol Raw : %v", b)
		sp := PacketAdminServerProtocol{
			Packet: p,
		}
		sp.Read(b)
		logInfoDebug("AdminPacketServerProtocol :\n-  ProtocolVersion: %v\n-  FurtherData: %v\n-  UpdatePacketType: %v\n-  FrequenciesAllowed: %b", sp.ProtocolVersion, sp.FurtherData, sp.UpdatePacketType, sp.FrequenciesAllowed)
	case AdminPacketServerWelcome:
		logInfoDebug("AdminPacketServerWelcome Raw : %v", b)
		sp := PacketAdminServerWelcome{
			Packet: p,
		}
		sp.Read(b)
		logInfoDebug("AdminPacketServerWelcome :\n-  ServerName: %v\n-  OpenTTDVersion: %v\n-  Dedicated: %v\n-  MapSeed: %x\n-  MapLandscape: %v\n-  MapStartDate: %v\n-  Size: %v x %v", sp.ServerName, sp.OpenTTDVersion, sp.Dedicated, sp.MapSeed, sp.MapLandscape, sp.MapStartDate, sp.MapX, sp.MapY)
	default:

	}

}