lisp/telnet.el

   1 ;; Copyright (C) 1985, 1988 Free Software Foundation, Inc.
   2
   3 ;; This file is part of GNU Emacs.
   4
   5 ;; GNU Emacs is free software; you can redistribute it and/or modify
   6 ;; it under the terms of the GNU General Public License as published by
   7 ;; the Free Software Foundation; either version 1, or (at your option)
   8 ;; any later version.
   9
  10 ;; GNU Emacs is distributed in the hope that it will be useful,
  11 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
  12 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13 ;; GNU General Public License for more details.
  14
  15 ;; You should have received a copy of the GNU General Public License
  16 ;; along with GNU Emacs; see the file COPYING.  If not, write to
  17 ;; the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
  18
  19 ;; Author William F. Schelter
  20
  21 ;;to do fix software types for lispm:
  22 ;;to eval current expression.  Also to try to send escape keys correctly.
  23 ;;essentially we'll want the rubout-handler off.
  24
  25 ;; filter is simplistic but should be okay for typical shell usage.
  26 ;; needs hacking if it is going to deal with asynchronous output in a sane
  27 ;; manner
  28
  29 (require 'comint)
  30 (defvar telnet-new-line "\r")
  31 (defvar telnet-mode-map nil)
  32 (defvar telnet-prompt-pattern "^[^#$%>]*[#$%>] *")
  33 (defvar telnet-replace-c-g nil)
  34 (make-variable-buffer-local
  35  (defvar telnet-remote-echoes t
  36    "True if the telnet process will echo input."))
  37 (make-variable-buffer-local
  38  (defvar telnet-interrupt-string "\C-c" "String sent by C-c."))
  39
  40 (defvar telnet-count 0
  41   "Number of output strings read from the telnet process
  42 while looking for the initial password.")
  43
  44 (defvar telnet-initial-count -50
  45   "Initial value of telnet-count.  Should be set to the negative of the
  46 number of terminal writes telnet will make setting up the host connection.")
  47
  48 (defvar telnet-maximum-count 4
  49   "Maximum value telnet-count can have.
  50 After this many passes, we stop looking for initial setup data.
  51 Should be set to the number of terminal writes telnet will make
  52 rejecting one login and prompting for the again for a username and password.")
  53
  54 (defun telnet-interrupt-subjob ()
  55   (interactive)
  56   "Interrupt the program running through telnet on the remote host."
  57   (send-string nil telnet-interrupt-string))
  58
  59 (defun telnet-c-z ()
  60   (interactive)
  61   (send-string nil "\C-z"))
  62
  63 (defun send-process-next-char ()
  64   (interactive)
  65   (send-string nil
  66                (char-to-string
  67                 (let ((inhibit-quit t))
  68                   (prog1 (read-char)
  69                     (setq quit-flag nil))))))
  70
  71 ; initialization on first load.
  72 (if telnet-mode-map
  73     nil
  74   (setq telnet-mode-map (copy-keymap comint-mode-map))
  75   (define-key telnet-mode-map "\C-m" 'telnet-send-input)
  76 ;  (define-key telnet-mode-map "\C-j" 'telnet-send-input)
  77   (define-key telnet-mode-map "\C-c\C-q" 'send-process-next-char)
  78   (define-key telnet-mode-map "\C-c\C-c" 'telnet-interrupt-subjob)
  79   (define-key telnet-mode-map "\C-c\C-z" 'telnet-c-z))
  80
  81 ;;maybe should have a flag for when have found type
  82 (defun telnet-check-software-type-initialize (string)
  83   "Tries to put correct initializations in.  Needs work."
  84   (let ((case-fold-search t))
  85     (cond ((string-match "unix" string)
  86          (setq telnet-prompt-pattern comint-prompt-regexp)
  87          (setq telnet-new-line "\n"))
  88         ((string-match "tops-20" string) ;;maybe add telnet-replace-c-g
  89          (setq telnet-prompt-pattern  "[@>]*"))
  90         ((string-match "its" string)
  91          (setq telnet-prompt-pattern  "^[^*>]*[*>] *"))
  92         ((string-match "explorer" string)  ;;explorer telnet needs work
  93          (setq telnet-replace-c-g ?\n))))
  94   (setq comint-prompt-regexp telnet-prompt-pattern))
  95
  96 (defun telnet-initial-filter (proc string)
  97   ;For reading up to and including password; also will get machine type.
  98   (cond ((string-match "No such host" string)
  99          (kill-buffer (process-buffer proc))
 100          (error "No such host."))
 101         ((string-match "passw" string)
 102          (telnet-filter proc string)
 103          (let* ((echo-keystrokes 0)
 104                 (password (read-password)))
 105            (setq telnet-count 0)
 106            (send-string proc (concat password telnet-new-line))))
 107         (t (telnet-check-software-type-initialize string)
 108            (telnet-filter proc string)
 109            (cond ((> telnet-count telnet-maximum-count)
 110                   (set-process-filter proc 'telnet-filter))
 111                  (t (setq telnet-count (1+ telnet-count)))))))
 112
 113 (defun telnet-filter (proc string)
 114   (let ((at-end
 115          (and (eq (process-buffer proc) (current-buffer))
 116               (= (point) (point-max)))))
 117     (save-excursion
 118       (set-buffer (process-buffer proc))
 119       (goto-char (process-mark proc))
 120       (let ((now (point)))
 121         (let ((index 0) c-m)
 122           (while (setq c-m (string-match "\C-m" string index))
 123             (insert-before-markers (substring string index c-m))
 124             (setq index (1+ c-m)))
 125           (insert-before-markers (substring string index)))
 126         (and telnet-replace-c-g
 127              (subst-char-in-region now (point) ?\C-g telnet-replace-c-g)))
 128 ;      (if (and (integer-or-marker-p last-input-start)
 129 ;              (marker-position last-input-start)
 130 ;              telnet-remote-echoes)
 131 ;         (delete-region last-input-start last-input-end))
 132       )
 133     (if at-end
 134         (goto-char (point-max)))))
 135
 136 (defun telnet-send-input ()
 137   (interactive)
 138   (comint-send-input telnet-new-line telnet-remote-echoes))
 139
 140 ;;;###autoload
 141 (defun telnet (arg)
 142   "Open a network login connection to host named HOST (a string).
 143 Communication with HOST is recorded in a buffer *HOST-telnet*.
 144 Normally input is edited in Emacs and sent a line at a time."
 145   (interactive "sOpen telnet connection to host: ")
 146   (let ((name (concat arg "-telnet" )))
 147     (switch-to-buffer (make-comint name "telnet"))
 148     (set-process-filter (get-process name) 'telnet-initial-filter)
 149     (erase-buffer)
 150     (send-string  name (concat "open " arg "\n"))
 151     (telnet-mode)
 152     (setq telnet-count telnet-initial-count)))
 153
 154 (defun telnet-mode ()
 155   "This mode is for use during telnet from a buffer to another
 156 host. It has most of the same commands as comint-mode.
 157 There is a variable ``telnet-interrupt-string'' which is the character
 158 sent to try to stop execution of a job on the remote host.
 159 Data is sent to the remote host when RET is typed.
 160
 161 \\{telnet-mode-map}
 162
 163 Bugs:
 164 --Replaces 
 by a space, really should remove."
 165   (interactive)
 166   (comint-mode)
 167   (setq major-mode 'telnet-mode
 168         mode-name "Telnet"
 169         comint-prompt-regexp telnet-prompt-pattern)
 170   (use-local-map telnet-mode-map)
 171   (run-hooks 'telnet-mode-hook))
 172
 173 (defun read-password ()
 174   (let ((answ "") tem)
 175     (message "Reading password...")
 176     (while (prog1 (not (memq (setq tem (read-char)) '(?\C-m ?\n ?\C-g)))
 177              (setq quit-flag nil))
 178       (setq answ (concat answ (char-to-string tem))))
 179     answ))
 180
 181 (provide 'telnet)
 182