refactor: separate core components and improve session & server handling

server/handler.go

@@ -0,0 +1,22 @@
+package server
+
+import (
+	"fmt"
+	"golang.org/x/crypto/ssh"
+	"log"
+	"net"
+	"tunnel_pls/session"
+)
+
+func (s *Server) handleConnection(conn net.Conn) {
+	sshConn, chans, reqs, err := ssh.NewServerConn(conn, s.Config)
+	if err != nil {
+		log.Printf("failed to establish SSH connection: %v", err)
+		conn.Close()
+		return
+	}
+
+	fmt.Println("SSH connection established:", sshConn.User())
+
+	session.New(sshConn, chans, reqs)
+}