CPunch/gopenfusion
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misc. refactoring

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CPunch 2023-03-06 18:39:41 -06:00
parent 7b60d679e4
commit d3d92c404b
5 changed files with 33 additions and 21 deletions
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3
README.md Normal file
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@ -0,0 +1,3 @@
# gopenfusion
Built off of the amazing work by the other openfusion contributors, comes a toy implementation rewritten in Go.

2
go.mod
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@ -1,3 +1,3 @@
module github.com/CPunch/GoFusion module github.com/CPunch/GopenFusion
go 1.19 go 1.19

4
protocol/packet.go
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@ -22,10 +22,10 @@ type Packet struct {
const PACK_ALIGN = 4 const PACK_ALIGN = 4
func NewPacket(sz int) *Packet { func NewPacket(buf []byte) *Packet {
pkt := &Packet{ pkt := &Packet{
ByteOrder: binary.LittleEndian, ByteOrder: binary.LittleEndian,
Buf: make([]byte, sz), Buf: buf,
cursor: 0, cursor: 0,
} }
return pkt return pkt

43
server/client.go
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@ -6,7 +6,7 @@ import (
"log" "log"
"net" "net"
"github.com/CPunch/GoFusion/protocol" "github.com/CPunch/GopenFusion/protocol"
) )
type Client struct { type Client struct {
@ -24,14 +24,13 @@ func newClient(server *Server, conn net.Conn, key []byte) *Client {
} }
func (client *Client) Send(data interface{}, typeID uint32) { func (client *Client) Send(data interface{}, typeID uint32) {
tmp := make([]byte, 4)
// encode // encode
pkt := protocol.NewPacket(0) pkt := protocol.NewPacket(make([]byte, 0))
pkt.Encode(data) pkt.Encode(data)
log.Printf("Sending %#v, sizeof: %d", data, len(pkt.Buf))
// write packet size // write packet size
log.Printf("Sending %#v, sizeof: %d", data, len(pkt.Buf)) tmp := make([]byte, 4)
binary.LittleEndian.PutUint32(tmp, uint32(len(pkt.Buf)+4)) binary.LittleEndian.PutUint32(tmp, uint32(len(pkt.Buf)+4))
if _, err := client.conn.Write(tmp); err != nil { if _, err := client.conn.Write(tmp); err != nil {
panic(fmt.Errorf("[FATAL] failed to write packet size! %v", err)) panic(fmt.Errorf("[FATAL] failed to write packet size! %v", err))
@ -39,13 +38,13 @@ func (client *Client) Send(data interface{}, typeID uint32) {
// prepend the typeID to the packet body // prepend the typeID to the packet body
binary.LittleEndian.PutUint32(tmp, uint32(typeID)) binary.LittleEndian.PutUint32(tmp, uint32(typeID))
pkt.Buf = append(tmp, pkt.Buf...) tmp = append(tmp, pkt.Buf...)
// encrypt body // encrypt typeID & body
protocol.EncryptData(pkt.Buf[:], client.key) protocol.EncryptData(tmp, client.key)
// write packet body // write packet body
if _, err := client.conn.Write(pkt.Buf); err != nil { if _, err := client.conn.Write(tmp); err != nil {
panic(fmt.Errorf("[FATAL] failed to write packet body! %v", err)) panic(fmt.Errorf("[FATAL] failed to write packet body! %v", err))
} }
log.Printf("sent!") log.Printf("sent!")
@ -60,7 +59,7 @@ func (client *Client) ClientHandler() {
client.server.unregister <- client client.server.unregister <- client
}() }()
tmp := make([]byte, 4) tmp := make([]byte, 4, protocol.CN_PACKET_BUFFER_SIZE)
for { for {
// read packet size // read packet size
if _, err := client.conn.Read(tmp); err != nil { if _, err := client.conn.Read(tmp); err != nil {
@ -68,27 +67,37 @@ func (client *Client) ClientHandler() {
} }
sz := int(binary.LittleEndian.Uint32(tmp)) 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 // read packet body
pkt := protocol.NewPacket(sz) if _, err := client.conn.Read(tmp[:sz]); err != nil {
if _, err := client.conn.Read(pkt.Buf); err != nil {
panic(fmt.Errorf("[FATAL] failed to read packet body! %v", err)) panic(fmt.Errorf("[FATAL] failed to read packet body! %v", err))
} }
// decrypt && grab typeID // decrypt && grab typeID
protocol.DecryptData(pkt.Buf[:], client.key) protocol.DecryptData(tmp[:sz], client.key)
typeID := int(binary.LittleEndian.Uint32(pkt.Read(4))) typeID := int(binary.LittleEndian.Uint32(tmp[:4]))
log.Printf("Got packet ID: %x, with a sizeof: %d\n", typeID, len(pkt.Buf)) log.Printf("Got packet ID: %x, with a sizeof: %d\n", typeID, sz)
pkt.ResetCursor() pkt := protocol.NewPacket(tmp[4:sz])
switch typeID { switch typeID {
case protocol.P_CL2LS_REQ_LOGIN: case protocol.P_CL2LS_REQ_LOGIN:
var loginPkt protocol.SP_CL2LS_REQ_LOGIN var loginPkt protocol.SP_CL2LS_REQ_LOGIN
pkt.Decode(&loginPkt) pkt.Decode(&loginPkt)
log.Printf("Got packet: %#v", loginPkt) log.Printf("Got packet: %#v", loginPkt)
client.Send(&protocol.SP_LS2CL_REP_LOGIN_FAIL{ErrorCode: protocol.LOGIN_FAIL_VERSION_ERROR, ID: loginPkt.ID}, protocol.P_LS2CL_REP_LOGIN_FAIL) client.Send(&protocol.SP_LS2CL_REP_LOGIN_FAIL{
ErrorCode: protocol.LOGIN_FAIL_VERSION_ERROR,
ID: loginPkt.ID,
}, protocol.P_LS2CL_REP_LOGIN_FAIL)
default: default:
log.Printf("[WARN] unsupported packet ID: %x\n", typeID) log.Printf("[WARN] unsupported packet ID: %x\n", typeID)
} }
// reset tmp
tmp = tmp[:4]
} }
} }

2
server/server.go
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@ -5,7 +5,7 @@ import (
"log" "log"
"net" "net"
"github.com/CPunch/GoFusion/protocol" "github.com/CPunch/GopenFusion/protocol"
) )
type Server struct { type Server struct {