1 ;;; telnet.el --- run a telnet session from within an Emacs buffer
3 ;;; Copyright (C) 1985, 1988, 1992, 1994 Free Software Foundation, Inc.
5 ;; Author: William F. Schelter
8 ;; This file is part of GNU Emacs.
10 ;; GNU Emacs is free software; you can redistribute it and/or modify
11 ;; it under the terms of the GNU General Public License as published by
12 ;; the Free Software Foundation; either version 2, or (at your option)
15 ;; GNU Emacs is distributed in the hope that it will be useful,
16 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
17 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 ;; GNU General Public License for more details.
20 ;; You should have received a copy of the GNU General Public License
21 ;; along with GNU Emacs; see the file COPYING. If not, write to
22 ;; the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
26 ;; This mode is intended to be used for telnet or rsh to a remode host;
27 ;; `telnet' and `rsh' are the two entry points. Multiple telnet or rsh
28 ;; sessions are supported.
30 ;; Normally, input is sent to the remote telnet/rsh line-by-line, as you
31 ;; type RET or LFD. C-c C-c sends a C-c to the remote immediately;
32 ;; C-c C-z sends C-z immediately. C-c C-q followed by any character
33 ;; sends that character immediately.
35 ;; All RET characters are filtered out of the output coming back from the
36 ;; remote system. The mode tries to do other useful translations based
37 ;; on what it sees coming back from the other system before the password
38 ;; query. It knows about UNIX, ITS, TOPS-20 and Explorer systems.
42 ;; to do fix software types for lispm:
43 ;; to eval current expression. Also to try to send escape keys correctly.
44 ;; essentially we'll want the rubout-handler off.
46 ;; filter is simplistic but should be okay for typical shell usage.
47 ;; needs hacking if it is going to deal with asynchronous output in a sane
52 (defvar telnet-new-line
"\r")
53 (defvar telnet-mode-map nil
)
54 (defvar telnet-prompt-pattern
"^[^#$%>\n]*[#$%>] *")
55 (defvar telnet-replace-c-g nil
)
56 (make-variable-buffer-local
57 (defvar telnet-remote-echoes t
58 "True if the telnet process will echo input."))
59 (make-variable-buffer-local
60 (defvar telnet-interrupt-string
"\C-c" "String sent by C-c."))
62 (defvar telnet-count
0
63 "Number of output strings from telnet process while looking for password.")
64 (make-variable-buffer-local 'telnet-count
)
66 (defvar telnet-program
"telnet"
67 "Program to run to open a telnet connection.")
70 (if (memq system-type
'(hpux usg-unix-v
))
72 "Program to run for opening a remote shell.")
74 (defvar telnet-initial-count -
50
75 "Initial value of `telnet-count'. Should be set to the negative of the
76 number of terminal writes telnet will make setting up the host connection.")
78 (defvar telnet-maximum-count
4
79 "Maximum value `telnet-count' can have.
80 After this many passes, we stop looking for initial setup data.
81 Should be set to the number of terminal writes telnet will make
82 rejecting one login and prompting again for a username and password.")
84 (defun telnet-interrupt-subjob ()
86 "Interrupt the program running through telnet on the remote host."
87 (send-string nil telnet-interrupt-string
))
91 (send-string nil
"\C-z"))
93 (defun send-process-next-char ()
97 (let ((inhibit-quit t
))
99 (setq quit-flag nil
))))))
101 ; initialization on first load.
104 (setq telnet-mode-map
(nconc (make-sparse-keymap) comint-mode-map
))
105 (define-key telnet-mode-map
"\C-m" 'telnet-send-input
)
106 ; (define-key telnet-mode-map "\C-j" 'telnet-send-input)
107 (define-key telnet-mode-map
"\C-c\C-q" 'send-process-next-char
)
108 (define-key telnet-mode-map
"\C-c\C-c" 'telnet-interrupt-subjob
)
109 (define-key telnet-mode-map
"\C-c\C-z" 'telnet-c-z
))
111 ;;maybe should have a flag for when have found type
112 (defun telnet-check-software-type-initialize (string)
113 "Tries to put correct initializations in. Needs work."
114 (let ((case-fold-search t
))
115 (cond ((string-match "unix" string
)
116 (setq telnet-prompt-pattern comint-prompt-regexp
)
117 (setq telnet-new-line
"\n"))
118 ((string-match "tops-20" string
) ;;maybe add telnet-replace-c-g
119 (setq telnet-prompt-pattern
"[@>]*"))
120 ((string-match "its" string
)
121 (setq telnet-prompt-pattern
"^[^*>\n]*[*>] *"))
122 ((string-match "explorer" string
) ;;explorer telnet needs work
123 (setq telnet-replace-c-g ?
\n))))
124 (setq comint-prompt-regexp telnet-prompt-pattern
))
126 (defun telnet-initial-filter (proc string
)
127 ;For reading up to and including password; also will get machine type.
128 (cond ((string-match "No such host" string
)
129 (kill-buffer (process-buffer proc
))
130 (error "No such host."))
131 ((string-match "passw" string
)
132 (telnet-filter proc string
)
133 (setq telnet-count
0)
134 (send-string proc
(concat (comint-read-noecho "Password: " t
)
136 (t (telnet-check-software-type-initialize string
)
137 (telnet-filter proc string
)
138 (cond ((> telnet-count telnet-maximum-count
)
139 (set-process-filter proc
'telnet-filter
))
140 (t (setq telnet-count
(1+ telnet-count
)))))))
142 ;; Identical to comint-simple-send, except that it sends telnet-new-line
144 (defun telnet-simple-send (proc string
)
145 (comint-send-string proc string
)
146 (comint-send-string proc telnet-new-line
))
148 (defun telnet-filter (proc string
)
150 (set-buffer (process-buffer proc
))
151 (let* ((last-insertion (marker-position (process-mark proc
)))
152 (delta (- (point) last-insertion
))
153 (ie (and comint-last-input-end
154 (marker-position comint-last-input-end
)))
155 (w (get-buffer-window (current-buffer)))
156 (ws (and w
(window-start w
))))
157 (goto-char last-insertion
)
158 (insert-before-markers string
)
159 (set-marker (process-mark proc
) (point))
160 (if ws
(set-window-start w ws t
))
161 (if ie
(set-marker comint-last-input-end ie
))
162 (while (progn (skip-chars-backward "^\C-m" last-insertion
)
163 (> (point) last-insertion
))
164 (delete-region (1- (point)) (point)))
165 (goto-char (process-mark proc
))
166 (and telnet-replace-c-g
167 (subst-char-in-region last-insertion
(point) ?\C-g
168 telnet-replace-c-g t
))
169 ;; If point is after the insertion place, move it
170 ;; along with the text.
172 (goto-char (+ (process-mark proc
) delta
))))))
174 (defun telnet-send-input ()
176 ; (comint-send-input telnet-new-line telnet-remote-echoes)
178 (if telnet-remote-echoes
179 (delete-region comint-last-input-start
180 comint-last-input-end
)))
184 "Open a network login connection to host named HOST (a string).
185 Communication with HOST is recorded in a buffer `*telnet-HOST*'.
186 Normally input is edited in Emacs and sent a line at a time."
187 (interactive "sOpen telnet connection to host: ")
188 (let* ((comint-delimiter-argument-list '(?\ ?
\t))
189 (name (concat "telnet-" (comint-arguments host
0 nil
) ))
190 (buffer (get-buffer (concat "*" name
"*"))))
191 (if (and buffer
(get-buffer-process buffer
))
192 (switch-to-buffer (concat "*" name
"*"))
193 (switch-to-buffer (make-comint name telnet-program
))
194 (set-process-filter (get-process name
) 'telnet-initial-filter
)
195 ;; Don't send the `open' cmd till telnet is ready for it.
196 (accept-process-output (get-process name
))
198 (send-string name
(concat "open " host
"\n"))
200 (setq comint-input-sender
'telnet-simple-send
)
201 (setq telnet-count telnet-initial-count
))))
203 (defun telnet-mode ()
204 "This mode is for using telnet (or rsh) from a buffer to another host.
205 It has most of the same commands as comint-mode.
206 There is a variable ``telnet-interrupt-string'' which is the character
207 sent to try to stop execution of a job on the remote host.
208 Data is sent to the remote host when RET is typed.
214 (setq major-mode
'telnet-mode
216 comint-prompt-regexp telnet-prompt-pattern
)
217 (use-local-map telnet-mode-map
)
218 (run-hooks 'telnet-mode-hook
))
222 "Open a network login connection to host named HOST (a string).
223 Communication with HOST is recorded in a buffer *HOST-rsh*.
224 Normally input is edited in Emacs and sent a line at a time."
225 (interactive "sOpen rsh connection to host: ")
227 (let ((name (concat host
"-rsh" )))
228 (switch-to-buffer (make-comint name rsh-program nil host
))
229 (set-process-filter (get-process name
) 'telnet-initial-filter
)
231 (setq telnet-count -
16)))
235 ;;; telnet.el ends here