mirror of
https://github.com/CPunch/gopenfusion.git
synced 2024-11-14 03:50:05 +00:00
102 lines
1.9 KiB
Go
102 lines
1.9 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/GoFusion/protocol"
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)
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const (
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E_KEY = "m@rQn~W#"
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KEY_LENGTH = 8
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)
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func encrypt_byte_change_A(ERSize int, data []byte) int {
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var num, num2, num3 int
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for num+ERSize <= len(data) {
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num4 := num + num3
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num5 := num + (ERSize - 1 - num3)
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b := data[num4]
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data[num4] = data[num5]
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data[num5] = b
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num += ERSize
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num3++
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if num3 > ERSize/2 {
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num3 = 0
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}
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}
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num2 = ERSize - (num + ERSize - len(data))
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return num + num2
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}
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func xorData(buff, key []byte, size int) {
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for i := 0; i < size; i++ {
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buff[i] ^= key[i%KEY_LENGTH]
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}
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}
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func decryptData(buff, key []byte) {
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ERSize := len(buff)%(KEY_LENGTH/2+1)*2 + KEY_LENGTH
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size := encrypt_byte_change_A(ERSize, buff)
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xorData(buff, key, size)
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}
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func handle(conn net.Conn) {
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defer func() {
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conn.Close()
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}()
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tmp := make([]byte, 4)
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for {
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// grab packet size
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if _, err := 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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pkt := protocol.NewPacket(sz)
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if _, err := conn.Read(pkt.Buf); 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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decryptData(pkt.Buf, []byte(E_KEY))
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typeID := int(binary.LittleEndian.Uint32(pkt.Read(4)))
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sizeof := len(pkt.Buf)
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log.Printf("Got packet ID: %x\n", typeID)
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pkt.ResetCursor()
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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, with a sizeof: %d", loginPkt, sizeof)
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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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}
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}
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func main() {
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server, err := net.Listen("tcp", ":23000")
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if err != nil {
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log.Fatal(err)
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}
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log.Print("Server hosted on 127.0.0.1:23000")
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for {
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conn, err := server.Accept()
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if err != nil {
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log.Println("Connection error: ", err)
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return
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}
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go handle(conn)
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}
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}
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