gopenfusion/server/client.go

130 lines
2.9 KiB
Go
Raw Normal View History

package server
2023-03-05 08:14:36 +00:00
import (
"encoding/binary"
"fmt"
"log"
"net"
"github.com/CPunch/GopenFusion/db"
"github.com/CPunch/GopenFusion/protocol"
2023-03-05 08:14:36 +00:00
)
const (
USE_E = iota
USE_FE
)
type ClientHandler interface {
HandlePacket(client *Client, typeID uint32, pkt *protocol.Packet)
Connect(client *Client)
Disconnect(client *Client)
}
2023-03-05 08:14:36 +00:00
type Client struct {
E_key []byte
FE_key []byte
SzID string
AccountID int
Player *db.Player
handler ClientHandler
conn net.Conn
alive bool
whichKey int
2023-03-05 08:14:36 +00:00
}
func NewClient(handler ClientHandler, conn net.Conn) *Client {
2023-03-05 08:14:36 +00:00
return &Client{
E_key: []byte(protocol.DEFAULT_KEY),
FE_key: nil,
SzID: "",
AccountID: -1,
Player: nil,
handler: handler,
conn: conn,
alive: true,
whichKey: USE_E,
2023-03-05 08:14:36 +00:00
}
}
func (client *Client) Send(data interface{}, typeID uint32) {
// encode
pkt := protocol.NewPacket(make([]byte, 0))
2023-03-05 08:14:36 +00:00
pkt.Encode(data)
2023-03-07 00:39:41 +00:00
log.Printf("Sending %#v, sizeof: %d", data, len(pkt.Buf))
2023-03-05 08:14:36 +00:00
// write packet size
2023-03-07 00:39:41 +00:00
tmp := make([]byte, 4)
2023-03-05 08:14:36 +00:00
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))
2023-03-07 00:39:41 +00:00
tmp = append(tmp, pkt.Buf...)
2023-03-05 08:14:36 +00:00
2023-03-07 00:39:41 +00:00
// encrypt typeID & body
switch client.whichKey {
case USE_E:
protocol.EncryptData(tmp, client.E_key)
case USE_FE:
protocol.EncryptData(tmp, client.FE_key)
}
2023-03-05 08:14:36 +00:00
// write packet body
2023-03-07 00:39:41 +00:00
if _, err := client.conn.Write(tmp); err != nil {
2023-03-05 08:14:36 +00:00
panic(fmt.Errorf("[FATAL] failed to write packet body! %v", err))
}
}
func (client *Client) Kill() {
if !client.alive {
return
}
client.alive = false
client.conn.Close()
client.handler.Disconnect(client)
}
2023-03-05 08:14:36 +00:00
func (client *Client) ClientHandler() {
defer func() {
2023-03-05 08:32:11 +00:00
if err := recover(); err != nil {
log.Printf("Client %p panic'd! %v", client, err)
}
client.Kill()
2023-03-05 08:14:36 +00:00
}()
tmp := make([]byte, 4, protocol.CN_PACKET_BUFFER_SIZE)
2023-03-05 08:14:36 +00:00
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))
2023-03-07 00:39:41 +00:00
// client should never send a packet size outside of this range
if sz > protocol.CN_PACKET_BUFFER_SIZE || sz < 4 {
2023-03-07 00:39:41 +00:00
panic(fmt.Errorf("[FATAL] malicious packet size received! %d", sz))
}
2023-03-05 08:14:36 +00:00
// read packet body
2023-03-07 00:39:41 +00:00
if _, err := client.conn.Read(tmp[:sz]); err != nil {
2023-03-05 08:14:36 +00:00
panic(fmt.Errorf("[FATAL] failed to read packet body! %v", err))
}
// decrypt && grab typeID
protocol.DecryptData(tmp[:sz], client.E_key)
2023-03-07 08:06:40 +00:00
typeID := uint32(binary.LittleEndian.Uint32(tmp[:4]))
2023-03-05 08:14:36 +00:00
2023-03-07 08:06:40 +00:00
// dispatch packet
2023-03-07 00:39:41 +00:00
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)
2023-03-07 00:39:41 +00:00
// reset tmp
tmp = tmp[:4]
2023-03-05 08:14:36 +00:00
}
}