gopenfusion/server/peer.go

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package server
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import (
"encoding/binary"
"fmt"
"io"
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"log"
"net"
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"github.com/CPunch/gopenfusion/db"
"github.com/CPunch/gopenfusion/protocol"
"github.com/CPunch/gopenfusion/protocol/pool"
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)
const (
USE_E = iota
USE_FE
)
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type PeerHandler interface {
HandlePacket(client *Peer, typeID uint32, pkt *protocol.Packet)
Connect(client *Peer)
Disconnect(client *Peer)
}
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type Peer struct {
E_key []byte
FE_key []byte
SzID string
AccountID int
Player *db.Player
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handler PeerHandler
conn net.Conn
alive bool
whichKey int
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}
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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,
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}
}
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func (client *Peer) Send(data interface{}, typeID uint32) {
buf := pool.Get()
defer func() { // always return the buffer to the pool
pool.Put(buf)
}()
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// encode
pkt := protocol.NewPacket(buf)
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// write the typeID and packet body
pkt.Encode(uint32(typeID))
pkt.Encode(data)
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// write the packet size
binary.Write(client.conn, binary.LittleEndian, uint32(buf.Len()))
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// encrypt typeID & body
switch client.whichKey {
case USE_E:
protocol.EncryptData(buf.Bytes(), client.E_key)
case USE_FE:
protocol.EncryptData(buf.Bytes(), client.FE_key)
}
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// write packet type && packet body
log.Printf("Sending %#v, sizeof: %d", data, buf.Len())
if _, err := client.conn.Write(buf.Bytes()); err != nil {
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panic(fmt.Errorf("[FATAL] failed to write packet body! %v", err))
}
}
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func (client *Peer) Kill() {
if !client.alive {
return
}
client.alive = false
client.conn.Close()
client.handler.Disconnect(client)
}
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func (client *Peer) ClientHandler() {
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defer func() {
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if err := recover(); err != nil {
log.Printf("Client %p panic'd! %v", client, err)
}
client.Kill()
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}()
for {
// read packet size
var sz uint32
if err := binary.Read(client.conn, binary.LittleEndian, &sz); err != nil {
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panic(fmt.Errorf("[FATAL] failed to read packet size! %v", err))
}
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// client should never send a packet size outside of this range
if sz > protocol.CN_PACKET_BUFFER_SIZE || sz < 4 {
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panic(fmt.Errorf("[FATAL] malicious packet size received! %d", sz))
}
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// read packet body
buf := pool.Get()
if _, err := buf.ReadFrom(io.LimitReader(client.conn, int64(sz))); err != nil {
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panic(fmt.Errorf("[FATAL] failed to read packet body! %v", err))
}
fmt.Printf("%#v", buf)
// decrypt
protocol.DecryptData(buf.Bytes(), client.E_key)
// create packet && read typeID
var typeID uint32
pkt := protocol.NewPacket(buf)
pkt.Decode(&typeID)
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// dispatch packet
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log.Printf("Got packet ID: %x, with a sizeof: %d\n", typeID, sz)
client.handler.HandlePacket(client, typeID, pkt)
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// restore buffer to pool
pool.Put(buf)
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}
}