refactor: move CreateForwardedTCPIPPayload to forwarder interface

server/server.go

@@ -1,13 +1,10 @@
 package server
 
 import (
-	"bytes"
-	"encoding/binary"
 	"fmt"
 	"log"
 	"net"
 	"net/http"
-	"strconv"
 	"tunnel_pls/utils"
 
 	"golang.org/x/crypto/ssh"
@@ -58,41 +55,3 @@ func (s *Server) Start() {
 		go s.handleConnection(conn)
 	}
 }
-
-func createForwardedTCPIPPayload(host string, originPort, port uint16) []byte {
-	var buf bytes.Buffer
-
-	writeSSHString(&buf, "localhost")
-	err := binary.Write(&buf, binary.BigEndian, uint32(port))
-	if err != nil {
-		log.Printf("Failed to write string to buffer: %v", err)
-		return nil
-	}
-	writeSSHString(&buf, host)
-	err = binary.Write(&buf, binary.BigEndian, uint32(originPort))
-	if err != nil {
-		log.Printf("Failed to write string to buffer: %v", err)
-		return nil
-	}
-
-	return buf.Bytes()
-}
-
-func writeSSHString(buffer *bytes.Buffer, str string) {
-	err := binary.Write(buffer, binary.BigEndian, uint32(len(str)))
-	if err != nil {
-		log.Printf("Failed to write string to buffer: %v", err)
-		return
-	}
-	buffer.WriteString(str)
-}
-
-func ParseAddr(addr string) (string, uint32) {
-	host, portStr, err := net.SplitHostPort(addr)
-	if err != nil {
-		log.Printf("Failed to parse origin address: %s from address %s", err.Error(), addr)
-		return "0.0.0.0", uint32(0)
-	}
-	port, _ := strconv.Atoi(portStr)
-	return host, uint32(port)
-}