mirror of
https://github.com/CPunch/gopenfusion.git
synced 2024-09-20 03:08:19 +00:00
104 lines
2.5 KiB
Go
104 lines
2.5 KiB
Go
package main
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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/protocol"
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)
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type Client struct {
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server *Server
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conn net.Conn
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key []byte
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}
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func newClient(server *Server, conn net.Conn, key []byte) *Client {
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return &Client{
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server: server,
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conn: conn,
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key: key,
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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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protocol.EncryptData(tmp, client.key)
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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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log.Printf("sent!")
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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.conn.Close()
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client.server.unregister <- client
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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.key)
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typeID := int(binary.LittleEndian.Uint32(tmp[:4]))
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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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switch typeID {
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case protocol.P_CL2LS_REQ_LOGIN:
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var loginPkt protocol.SP_CL2LS_REQ_LOGIN
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pkt.Decode(&loginPkt)
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log.Printf("Got packet: %#v", loginPkt)
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client.Send(&protocol.SP_LS2CL_REP_LOGIN_FAIL{
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ErrorCode: protocol.LOGIN_FAIL_VERSION_ERROR,
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ID: loginPkt.ID,
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}, protocol.P_LS2CL_REP_LOGIN_FAIL)
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default:
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log.Printf("[WARN] unsupported packet ID: %x\n", typeID)
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}
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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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