1 ;;;; -*- Mode: Lisp; Syntax: ANSI-Common-Lisp; Base: 10 -*-
2 ;;;; *************************************************************************
3 ;;;; FILE IDENTIFICATION
5 ;;;; Name: telnet-server.lisp
6 ;;;; Purpose: A telnet server
7 ;;;; Programmer: Kevin M. Rosenberg
8 ;;;; Date Started: Apr 2000
10 ;;;; $Id: telnet-server.lisp,v 1.6 2003/07/09 19:19:19 kevin Exp $
12 ;;;; This file, part of KMRCL, is Copyright (c) 2002 by Kevin M. Rosenberg
14 ;;;; KMRCL users are granted the rights to distribute and use this software
15 ;;;; as governed by the terms of the Lisp Lesser GNU Public License
16 ;;;; (http://opensource.franz.com/preamble.html), also known as the LLGPL.
17 ;;;; *************************************************************************
21 (defconstant +default-telnet-server-port+ 4000)
24 ((listener :initarg :listener :accessor listener
26 (users :initarg :users :accessor users
28 (announce :initarg :announce :accessor announce
31 (defun start-telnet-server (&key (port +default-telnet-server-port+)
35 (make-instance 'telnetd
38 (make-instance 'listener :port port
40 :function 'telnet-worker
41 :function-args (list users announce)
48 (defun telnet-worker (conn users announce)
50 (format conn "~A~%" announce))
52 (let (user-name password)
53 (format conn "user: ")
54 (setq user-name (read-line conn))
55 (format conn "password: ")
56 (setq password (read-line conn))
57 (unless (and (string= user (car users))
58 (string= password (cdr users)))
59 (format conn "Invalid login~%")
60 (return-from telnet-worker))))
62 (tpl::start-interactive-top-level
64 #'tpl::top-level-read-eval-print-loop
67 (telnet-on-stream conn)
70 (defun read-telnet-line (stream)
71 (string-right-trim-one-char #\return
72 (read-line stream nil nil)))
74 (defun print-prompt (stream)
75 (format stream "~&~A> " (package-name *package*))
76 (force-output stream))
78 (defvar *telnet-password* "")
80 (defun telnet-on-stream (stream)
82 (loop for line = (read-telnet-line stream)
86 (format stream "~S" (eval (read-from-string line))))
88 (print-prompt stream)))