275 lines
11 KiB
EmacsLisp
275 lines
11 KiB
EmacsLisp
;;; telnet.el --- run a telnet session from within an Emacs buffer -*- lexical-binding: t; -*-
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;; Copyright (C) 1985-2024 Free Software Foundation, Inc.
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;; Author: William F. Schelter
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;; Maintainer: emacs-devel@gnu.org
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;; Keywords: unix, comm
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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 3 of the License, or
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;; (at your option) 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. If not, see <https://www.gnu.org/licenses/>.
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;;; Commentary:
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;; This mode is intended to be used for telnet to a remote host;
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;; `telnet' is the entry point. Multiple telnet sessions are
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;; supported.
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;;
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;; Normally, input is sent to the remote telnet 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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;;
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;; You can use the global telnet-host-properties to associate a telnet
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;; program and login name with each host you regularly telnet to.
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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-host-properties ()
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"Specify which telnet program to use for particular hosts.
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Each element has the form (HOSTNAME PROGRAM [LOGIN-NAME])
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HOSTNAME says which machine the element applies to.
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PROGRAM says which program to run, to talk to that machine.
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LOGIN-NAME, which is optional, says what to log in as on that machine.")
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(defvar telnet-new-line "\r")
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(defvar-keymap telnet-mode-map
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:parent comint-mode-map
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"RET" #'telnet-send-input
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;; "C-j" #'telnet-send-input
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"C-c C-q" #'send-process-next-char
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"C-c C-c" #'telnet-interrupt-subjob
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"C-c C-z" #'telnet-c-z)
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(defvar telnet-prompt-pattern "^[^#$%>\n]*[#$%>] *")
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(defvar telnet-replace-c-g nil)
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(defvar-local telnet-remote-echoes t
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"Non-nil if the telnet process will echo input.")
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(defvar-local telnet-interrupt-string "\C-c"
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"String sent by C-c.")
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(defvar-local telnet-count 0
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"Number of output strings from telnet process while looking for password.")
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(defvar telnet-program "telnet"
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"Program to run to open a telnet connection.")
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(defvar telnet-initial-count -50
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"Initial value of `telnet-count'.
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Should be set to the negative of the number of terminal writes
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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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(defvar telnet-connect-command nil
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"Command used to start the `telnet' connection.")
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(defun telnet-interrupt-subjob ()
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"Interrupt the program running through telnet on the remote host."
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(interactive)
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(process-send-string nil telnet-interrupt-string))
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(defun telnet-revert-buffer (ignore-auto noconfirm)
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(if buffer-file-name
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(let (revert-buffer-function)
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(revert-buffer ignore-auto noconfirm))
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(if (or noconfirm
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(yes-or-no-p "Restart connection? "))
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(apply telnet-connect-command))))
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(defun telnet-c-z ()
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(interactive)
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(process-send-string nil "\C-z"))
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(defun send-process-next-char ()
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(interactive)
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(process-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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;;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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"Try 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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(save-current-buffer
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(set-buffer (process-buffer proc))
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(let ((case-fold-search t))
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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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(process-send-string proc (concat (read-passwd "Password: ")
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telnet-new-line))
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(clear-this-command-keys))
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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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(if comint-input-sender-no-newline
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(if (not (string-equal string ""))
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(process-send-eof))
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(comint-send-string proc telnet-new-line)))
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(defun telnet-filter (proc string)
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(with-current-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 string)
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(set-marker comint-last-output-start last-insertion)
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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 &optional port)
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"Open a network login connection to host named HOST (a string).
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Optional arg PORT specifies alternative port to connect to.
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Interactively, use \\[universal-argument] prefix to be prompted for port number.
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Communication with HOST is recorded in a buffer `*PROGRAM-HOST*'
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where PROGRAM is the telnet program being used. This program
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is controlled by the contents of the global variable `telnet-host-properties',
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falling back on the value of the global variable `telnet-program'.
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Normally input is edited in Emacs and sent a line at a time."
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(interactive (list (read-string "Open connection to host: ")
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(cond
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((null current-prefix-arg) nil)
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((consp current-prefix-arg) (read-string "Port: "))
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(t (prefix-numeric-value current-prefix-arg)))))
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(if (and port (numberp port))
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(setq port (int-to-string port)))
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(let* ((comint-delimiter-argument-list '(?\ ?\t))
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(properties (cdr (assoc host telnet-host-properties)))
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(telnet-program (if properties (car properties) telnet-program))
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(hname (if port (concat host ":" port) host))
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(name (concat telnet-program "-" (comint-arguments hname 0 nil) ))
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(buffer (get-buffer (concat "*" name "*")))
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(telnet-options (if (cdr properties) (cons "-l" (cdr properties))))
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process)
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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
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(apply #'make-comint name telnet-program nil telnet-options))
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(setq process (get-buffer-process (current-buffer)))
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(set-process-filter process #'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 process)
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(erase-buffer)
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(process-send-string process (concat "open " host
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(if port " " "") (or port "")
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"\n"))
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(telnet-mode)
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(setq-local telnet-connect-command (list 'telnet host port))
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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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(put 'telnet-mode 'mode-class 'special)
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(define-derived-mode telnet-mode comint-mode "Telnet"
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"This mode is for using telnet 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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(setq-local revert-buffer-function 'telnet-revert-buffer)
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(setq-local window-point-insertion-type t)
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(setq-local comint-prompt-regexp telnet-prompt-pattern)
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(setq-local comint-use-prompt-regexp t))
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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 `*rsh-HOST*'.
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Normally input is edited in Emacs and sent a line at a time."
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(declare (obsolete nil "29.1"))
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(interactive "sOpen rsh connection to host: ")
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(require 'shell)
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(let ((name (concat "rsh-" host )))
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(switch-to-buffer (make-comint name remote-shell-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-local telnet-connect-command (list 'rsh host))
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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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