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- ;;; telnet.el --- run a telnet session from within an Emacs buffer
-
- ;;; Copyright (C) 1985, 1988, 1992 Free Software Foundation, Inc.
-
- ;; Author: William F. Schelter
- ;; Maintainer: FSF
-
- ;; This file is part of GNU Emacs.
-
- ;; GNU Emacs is free software; you can redistribute it and/or modify
- ;; it under the terms of the GNU General Public License as published by
- ;; the Free Software Foundation; either version 2, or (at your option)
- ;; any later version.
-
- ;; GNU Emacs is distributed in the hope that it will be useful,
- ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
- ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- ;; GNU General Public License for more details.
-
- ;; You should have received a copy of the GNU General Public License
- ;; along with GNU Emacs; see the file COPYING. If not, write to
- ;; the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
-
- ;;; Commentary:
-
- ;; This mode is intended to be used for telnet or rsh to a remode host;
- ;; `telnet' and `rsh' are the two entry points. Multiple telnet or rsh
- ;; sessions are supported.
- ;;
- ;; Normally, input is sent to the remote telnet/rsh line-by-line, as you
- ;; type RET or LFD. C-c C-c sends a C-c to the remote immediately;
- ;; C-c C-z sends C-z immediately. C-c C-q followed by any character
- ;; sends that character immediately.
- ;;
- ;; All RET characters are filtered out of the output coming back from the
- ;; remote system. The mode tries to do other useful translations based
- ;; on what it sees coming back from the other system before the password
- ;; query. It knows about UNIX, ITS, TOPS-20 and Explorer systems.
-
- ;;; Code:
-
- ;; to do fix software types for lispm:
- ;; to eval current expression. Also to try to send escape keys correctly.
- ;; essentially we'll want the rubout-handler off.
-
- ;; filter is simplistic but should be okay for typical shell usage.
- ;; needs hacking if it is going to deal with asynchronous output in a sane
- ;; manner
-
- (require 'comint)
-
- (defvar telnet-new-line "\r")
- (defvar telnet-mode-map nil)
- (defvar telnet-prompt-pattern "^[^#$%>]*[#$%>] *")
- (defvar telnet-replace-c-g nil)
- (make-variable-buffer-local
- (defvar telnet-remote-echoes t
- "True if the telnet process will echo input."))
- (make-variable-buffer-local
- (defvar telnet-interrupt-string "\C-c" "String sent by C-c."))
-
- (defvar telnet-count 0
- "Number of output strings read from the telnet process
- while looking for the initial password.")
-
- (defvar telnet-initial-count -50
- "Initial value of `telnet-count'. Should be set to the negative of the
- number of terminal writes telnet will make setting up the host connection.")
-
- (defvar telnet-maximum-count 4
- "Maximum value `telnet-count' can have.
- After this many passes, we stop looking for initial setup data.
- Should be set to the number of terminal writes telnet will make
- rejecting one login and prompting for the again for a username and password.")
-
- (defun telnet-interrupt-subjob ()
- (interactive)
- "Interrupt the program running through telnet on the remote host."
- (send-string nil telnet-interrupt-string))
-
- (defun telnet-c-z ()
- (interactive)
- (send-string nil "\C-z"))
-
- (defun send-process-next-char ()
- (interactive)
- (send-string nil
- (char-to-string
- (let ((inhibit-quit t))
- (prog1 (read-char)
- (setq quit-flag nil))))))
-
- ; initialization on first load.
- (if telnet-mode-map
- nil
- (setq telnet-mode-map (copy-keymap comint-mode-map))
- (define-key telnet-mode-map "\C-m" 'telnet-send-input)
- ; (define-key telnet-mode-map "\C-j" 'telnet-send-input)
- (define-key telnet-mode-map "\C-c\C-q" 'send-process-next-char)
- (define-key telnet-mode-map "\C-c\C-c" 'telnet-interrupt-subjob)
- (define-key telnet-mode-map "\C-c\C-z" 'telnet-c-z))
-
- ;;maybe should have a flag for when have found type
- (defun telnet-check-software-type-initialize (string)
- "Tries to put correct initializations in. Needs work."
- (let ((case-fold-search t))
- (cond ((string-match "unix" string)
- (setq telnet-prompt-pattern comint-prompt-regexp)
- (setq telnet-new-line "\n"))
- ((string-match "tops-20" string) ;;maybe add telnet-replace-c-g
- (setq telnet-prompt-pattern "[@>]*"))
- ((string-match "its" string)
- (setq telnet-prompt-pattern "^[^*>]*[*>] *"))
- ((string-match "explorer" string) ;;explorer telnet needs work
- (setq telnet-replace-c-g ?\n))))
- (setq comint-prompt-regexp telnet-prompt-pattern))
-
- (defun telnet-initial-filter (proc string)
- ;For reading up to and including password; also will get machine type.
- (cond ((string-match "No such host" string)
- (kill-buffer (process-buffer proc))
- (error "No such host."))
- ((string-match "passw" string)
- (telnet-filter proc string)
- (let* ((echo-keystrokes 0)
- (password (read-password)))
- (setq telnet-count 0)
- (send-string proc (concat password telnet-new-line))))
- (t (telnet-check-software-type-initialize string)
- (telnet-filter proc string)
- (cond ((> telnet-count telnet-maximum-count)
- (set-process-filter proc 'telnet-filter))
- (t (setq telnet-count (1+ telnet-count)))))))
-
- ;; Identical to comint-simple-send, except that it sends telnet-new-line
- ;; instead of "\n".
- (defun telnet-simple-send (proc string)
- (comint-send-string proc string)
- (comint-send-string proc telnet-new-line))
-
- (defun telnet-filter (proc string)
- (let ((at-end
- (and (eq (process-buffer proc) (current-buffer))
- (= (point) (point-max)))))
- (save-excursion
- (set-buffer (process-buffer proc))
- (goto-char (process-mark proc))
- (let ((now (point)))
- ;; Insert STRING, omitting all C-m characters.
- (let ((index 0) c-m)
- (while (setq c-m (string-match "\C-m" string index))
- (insert-before-markers (substring string index c-m))
- (setq index (1+ c-m)))
- (insert-before-markers (substring string index)))
- (and telnet-replace-c-g
- (subst-char-in-region now (point) ?\C-g telnet-replace-c-g)))
- ; (if (and (integer-or-marker-p last-input-start)
- ; (marker-position last-input-start)
- ; telnet-remote-echoes)
- ; (delete-region last-input-start last-input-end))
- )
- (if at-end
- (goto-char (point-max)))))
-
- (defun telnet-send-input ()
- (interactive)
- ; (comint-send-input telnet-new-line telnet-remote-echoes)
- (comint-send-input)
- (if telnet-remote-echoes
- (delete-region comint-last-input-start
- comint-last-input-end)))
-
- ;;;###autoload
- (defun telnet (arg)
- "Open a network login connection to host named HOST (a string).
- Communication with HOST is recorded in a buffer *HOST-telnet*.
- Normally input is edited in Emacs and sent a line at a time."
- (interactive "sOpen telnet connection to host: ")
- (let ((name (concat arg "-telnet" )))
- (switch-to-buffer (make-comint name "telnet"))
- (set-process-filter (get-process name) 'telnet-initial-filter)
- ;; Don't send the `open' cmd till telnet is ready for it.
- (accept-process-output (get-process name))
- (erase-buffer)
- (send-string name (concat "open " arg "\n"))
- (telnet-mode)
- (setq comint-input-sender 'telnet-simple-send)
- (setq telnet-count telnet-initial-count)))
-
- (defun telnet-mode ()
- "This mode is for using telnet (or rsh) from a buffer to another host.
- It has most of the same commands as comint-mode.
- There is a variable ``telnet-interrupt-string'' which is the character
- sent to try to stop execution of a job on the remote host.
- Data is sent to the remote host when RET is typed.
-
- \\{telnet-mode-map}
- "
- (interactive)
- (comint-mode)
- (setq major-mode 'telnet-mode
- mode-name "Telnet"
- comint-prompt-regexp telnet-prompt-pattern)
- (use-local-map telnet-mode-map)
- (run-hooks 'telnet-mode-hook))
-
- ;;;###autoload
- (defun rsh (arg)
- "Open a network login connection to host named HOST (a string).
- Communication with HOST is recorded in a buffer *HOST-rsh*.
- Normally input is edited in Emacs and sent a line at a time."
- (interactive "sOpen rsh connection to host: ")
- (require 'shell)
- (let ((name (concat arg "-rsh" )))
- (switch-to-buffer (make-comint name "rsh"))
- (set-process-filter (get-process name) 'telnet-initial-filter)
- (telnet-mode)
- (setq telnet-count -16)))
-
- (defun read-password ()
- (let ((answ "") tem)
- (message "Reading password...")
- (while (prog1 (not (memq (setq tem (read-char)) '(?\C-m ?\n ?\C-g)))
- (setq quit-flag nil))
- (setq answ (concat answ (char-to-string tem))))
- answ))
-
- (provide 'telnet)
-
- ;;; telnet.el ends here
-