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233 lines
8.5 KiB
EmacsLisp
233 lines
8.5 KiB
EmacsLisp
;;; telnet.el --- run a telnet session from within an Emacs buffer
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;;; Copyright (C) 1985, 1988, 1992, 1994 Free Software Foundation, Inc.
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;; Author: William F. Schelter
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;; Maintainer: FSF
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;; This file is part of GNU Emacs.
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;; GNU Emacs is free software; you can redistribute it and/or modify
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;; it under the terms of the GNU General Public License as published by
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;; the Free Software Foundation; either version 2, or (at your option)
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;; any later version.
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;; GNU Emacs is distributed in the hope that it will be useful,
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;; but WITHOUT ANY WARRANTY; without even the implied warranty of
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;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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;; GNU General Public License for more details.
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;; You should have received a copy of the GNU General Public License
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;; along with GNU Emacs; see the file COPYING. If not, write to
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;; the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
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;;; Commentary:
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;; This mode is intended to be used for telnet or rsh to a remode host;
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;; `telnet' and `rsh' are the two entry points. Multiple telnet or rsh
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;; sessions are supported.
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;;
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;; Normally, input is sent to the remote telnet/rsh line-by-line, as you
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;; type RET or LFD. C-c C-c sends a C-c to the remote immediately;
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;; C-c C-z sends C-z immediately. C-c C-q followed by any character
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;; sends that character immediately.
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;;
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;; All RET characters are filtered out of the output coming back from the
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;; remote system. The mode tries to do other useful translations based
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;; on what it sees coming back from the other system before the password
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;; query. It knows about UNIX, ITS, TOPS-20 and Explorer systems.
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;;; Code:
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;; to do fix software types for lispm:
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;; to eval current expression. Also to try to send escape keys correctly.
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;; essentially we'll want the rubout-handler off.
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;; filter is simplistic but should be okay for typical shell usage.
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;; needs hacking if it is going to deal with asynchronous output in a sane
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;; manner
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(require 'comint)
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(defvar telnet-new-line "\r")
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(defvar telnet-mode-map nil)
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(defvar telnet-prompt-pattern "^[^#$%>\n]*[#$%>] *")
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(defvar telnet-replace-c-g nil)
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(make-variable-buffer-local
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(defvar telnet-remote-echoes t
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"True if the telnet process will echo input."))
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(make-variable-buffer-local
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(defvar telnet-interrupt-string "\C-c" "String sent by C-c."))
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(defvar telnet-count 0
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"Number of output strings from telnet process while looking for password.")
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(make-variable-buffer-local 'telnet-count)
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(defvar telnet-rsh-program
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(if (memq system-type '(hpux usg-unix-v))
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"remsh" "rsh")
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"Program to run for opening a remote shell.")
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(defvar telnet-initial-count -50
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"Initial value of `telnet-count'. Should be set to the negative of the
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number of terminal writes telnet will make setting up the host connection.")
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(defvar telnet-maximum-count 4
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"Maximum value `telnet-count' can have.
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After this many passes, we stop looking for initial setup data.
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Should be set to the number of terminal writes telnet will make
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rejecting one login and prompting again for a username and password.")
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(defun telnet-interrupt-subjob ()
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(interactive)
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"Interrupt the program running through telnet on the remote host."
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(send-string nil telnet-interrupt-string))
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(defun telnet-c-z ()
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(interactive)
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(send-string nil "\C-z"))
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(defun send-process-next-char ()
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(interactive)
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(send-string nil
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(char-to-string
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(let ((inhibit-quit t))
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(prog1 (read-char)
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(setq quit-flag nil))))))
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; initialization on first load.
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(if telnet-mode-map
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nil
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(setq telnet-mode-map (copy-keymap comint-mode-map))
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(define-key telnet-mode-map "\C-m" 'telnet-send-input)
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; (define-key telnet-mode-map "\C-j" 'telnet-send-input)
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(define-key telnet-mode-map "\C-c\C-q" 'send-process-next-char)
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(define-key telnet-mode-map "\C-c\C-c" 'telnet-interrupt-subjob)
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(define-key telnet-mode-map "\C-c\C-z" 'telnet-c-z))
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;;maybe should have a flag for when have found type
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(defun telnet-check-software-type-initialize (string)
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"Tries to put correct initializations in. Needs work."
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(let ((case-fold-search t))
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(cond ((string-match "unix" string)
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(setq telnet-prompt-pattern comint-prompt-regexp)
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(setq telnet-new-line "\n"))
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((string-match "tops-20" string) ;;maybe add telnet-replace-c-g
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(setq telnet-prompt-pattern "[@>]*"))
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((string-match "its" string)
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(setq telnet-prompt-pattern "^[^*>\n]*[*>] *"))
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((string-match "explorer" string) ;;explorer telnet needs work
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(setq telnet-replace-c-g ?\n))))
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(setq comint-prompt-regexp telnet-prompt-pattern))
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(defun telnet-initial-filter (proc string)
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;For reading up to and including password; also will get machine type.
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(cond ((string-match "No such host" string)
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(kill-buffer (process-buffer proc))
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(error "No such host."))
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((string-match "passw" string)
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(telnet-filter proc string)
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(setq telnet-count 0)
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(send-string proc (concat (comint-read-noecho "Password: " t)
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telnet-new-line)))
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(t (telnet-check-software-type-initialize string)
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(telnet-filter proc string)
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(cond ((> telnet-count telnet-maximum-count)
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(set-process-filter proc 'telnet-filter))
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(t (setq telnet-count (1+ telnet-count)))))))
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;; Identical to comint-simple-send, except that it sends telnet-new-line
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;; instead of "\n".
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(defun telnet-simple-send (proc string)
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(comint-send-string proc string)
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(comint-send-string proc telnet-new-line))
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(defun telnet-filter (proc string)
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(save-excursion
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(set-buffer (process-buffer proc))
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(let* ((last-insertion (marker-position (process-mark proc)))
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(delta (- (point) last-insertion))
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(ie (and comint-last-input-end
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(marker-position comint-last-input-end)))
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(w (get-buffer-window (current-buffer)))
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(ws (and w (window-start w))))
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(goto-char last-insertion)
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(insert-before-markers string)
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(set-marker (process-mark proc) (point))
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(if ws (set-window-start w ws t))
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(if ie (set-marker comint-last-input-end ie))
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(while (progn (skip-chars-backward "^\C-m" last-insertion)
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(> (point) last-insertion))
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(delete-region (1- (point)) (point)))
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(goto-char (process-mark proc))
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(and telnet-replace-c-g
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(subst-char-in-region last-insertion (point) ?\C-g
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telnet-replace-c-g t))
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;; If point is after the insertion place, move it
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;; along with the text.
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(if (> delta 0)
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(goto-char (+ (process-mark proc) delta))))))
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(defun telnet-send-input ()
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(interactive)
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; (comint-send-input telnet-new-line telnet-remote-echoes)
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(comint-send-input)
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(if telnet-remote-echoes
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(delete-region comint-last-input-start
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comint-last-input-end)))
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;;;###autoload
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(defun telnet (host)
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"Open a network login connection to host named HOST (a string).
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Communication with HOST is recorded in a buffer *HOST-telnet*.
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Normally input is edited in Emacs and sent a line at a time."
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(interactive "sOpen telnet connection to host: ")
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(let* ((comint-delimiter-argument-list '(?\ ?\t))
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(name (concat (comint-arguments host 0 nil) "-telnet" ))
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(buffer (get-buffer (concat "*" name "*"))))
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(if (and buffer (get-buffer-process buffer))
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(switch-to-buffer (concat "*" name "*"))
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(switch-to-buffer (make-comint name "telnet"))
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(set-process-filter (get-process name) 'telnet-initial-filter)
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;; Don't send the `open' cmd till telnet is ready for it.
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(accept-process-output (get-process name))
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(erase-buffer)
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(send-string name (concat "open " host "\n"))
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(telnet-mode)
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(setq comint-input-sender 'telnet-simple-send)
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(setq telnet-count telnet-initial-count))))
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(defun telnet-mode ()
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"This mode is for using telnet (or rsh) from a buffer to another host.
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It has most of the same commands as comint-mode.
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There is a variable ``telnet-interrupt-string'' which is the character
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sent to try to stop execution of a job on the remote host.
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Data is sent to the remote host when RET is typed.
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\\{telnet-mode-map}
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"
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(interactive)
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(comint-mode)
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(setq major-mode 'telnet-mode
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mode-name "Telnet"
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comint-prompt-regexp telnet-prompt-pattern)
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(use-local-map telnet-mode-map)
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(run-hooks 'telnet-mode-hook))
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;;;###autoload
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(defun rsh (host)
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"Open a network login connection to host named HOST (a string).
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Communication with HOST is recorded in a buffer *HOST-rsh*.
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Normally input is edited in Emacs and sent a line at a time."
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(interactive "sOpen rsh connection to host: ")
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(require 'shell)
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(let ((name (concat host "-rsh" )))
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(switch-to-buffer (make-comint name telnet-rsh-program nil host))
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(set-process-filter (get-process name) 'telnet-initial-filter)
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(telnet-mode)
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(setq telnet-count -16)))
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(provide 'telnet)
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;;; telnet.el ends here
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