gopenfusion/server/peer.go

130 lines
2.8 KiB
Go

package server
import (
"encoding/binary"
"fmt"
"log"
"net"
"github.com/CPunch/gopenfusion/db"
"github.com/CPunch/gopenfusion/protocol"
)
const (
USE_E = iota
USE_FE
)
type PeerHandler interface {
HandlePacket(client *Peer, typeID uint32, pkt *protocol.Packet)
Connect(client *Peer)
Disconnect(client *Peer)
}
type Peer struct {
E_key []byte
FE_key []byte
SzID string
AccountID int
Player *db.Player
handler PeerHandler
conn net.Conn
alive bool
whichKey int
}
func NewPeer(handler PeerHandler, conn net.Conn) *Peer {
return &Peer{
E_key: []byte(protocol.DEFAULT_KEY),
FE_key: nil,
SzID: "",
AccountID: -1,
Player: nil,
handler: handler,
conn: conn,
alive: true,
whichKey: USE_E,
}
}
func (client *Peer) Send(data interface{}, typeID uint32) {
// encode
pkt := protocol.NewPacket(make([]byte, 0))
pkt.Encode(data)
log.Printf("Sending %#v, sizeof: %d", data, len(pkt.Buf))
// write packet size
tmp := make([]byte, 4)
binary.LittleEndian.PutUint32(tmp, uint32(len(pkt.Buf)+4))
if _, err := client.conn.Write(tmp); err != nil {
panic(fmt.Errorf("[FATAL] failed to write packet size! %v", err))
}
// prepend the typeID to the packet body
binary.LittleEndian.PutUint32(tmp, uint32(typeID))
tmp = append(tmp, pkt.Buf...)
// encrypt typeID & body
switch client.whichKey {
case USE_E:
protocol.EncryptData(tmp, client.E_key)
case USE_FE:
protocol.EncryptData(tmp, client.FE_key)
}
// write packet body
if _, err := client.conn.Write(tmp); err != nil {
panic(fmt.Errorf("[FATAL] failed to write packet body! %v", err))
}
}
func (client *Peer) Kill() {
if !client.alive {
return
}
client.alive = false
client.conn.Close()
client.handler.Disconnect(client)
}
func (client *Peer) ClientHandler() {
defer func() {
if err := recover(); err != nil {
log.Printf("Client %p panic'd! %v", client, err)
}
client.Kill()
}()
tmp := make([]byte, 4, protocol.CN_PACKET_BUFFER_SIZE)
for {
// read packet size
if _, err := client.conn.Read(tmp); err != nil {
panic(fmt.Errorf("[FATAL] failed to read packet size! %v", err))
}
sz := int(binary.LittleEndian.Uint32(tmp))
// client should never send a packet size outside of this range
if sz > protocol.CN_PACKET_BUFFER_SIZE || sz < 4 {
panic(fmt.Errorf("[FATAL] malicious packet size received! %d", sz))
}
// read packet body
if _, err := client.conn.Read(tmp[:sz]); err != nil {
panic(fmt.Errorf("[FATAL] failed to read packet body! %v", err))
}
// decrypt && grab typeID
protocol.DecryptData(tmp[:sz], client.E_key)
typeID := uint32(binary.LittleEndian.Uint32(tmp[:4]))
// dispatch packet
log.Printf("Got packet ID: %x, with a sizeof: %d\n", typeID, sz)
pkt := protocol.NewPacket(tmp[4:sz])
client.handler.HandlePacket(client, typeID, pkt)
// reset tmp
tmp = tmp[:4]
}
}