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