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- ;;; ssh.el --- remote login interface
-
- ;; Copyright (C) 1996, 1997 Noah S. Friedman
-
- ;; Author: Noah Friedman <friedman@prep.ai.mit.edu>
- ;; Maintainer: friedman@prep.ai.mit.edu
- ;; Keywords: unix, comm
- ;; Created: 1996-07-03
-
- ;; $Id: ssh.el,v 1.3 1997/05/28 08:12:01 friedman Exp $
-
- ;; This program 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.
- ;;
- ;; This program 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 this program; if not, you can either send email to this
- ;; program's maintainer or write to: The Free Software Foundation,
- ;; Inc.; 59 Temple Place, Suite 330; Boston, MA 02111-1307, USA.
-
- ;;; Commentary:
-
- ;; Support for remote logins using `ssh'.
- ;; This program is layered on top of shell.el; the code here only accounts
- ;; for the variations needed to handle a remote process, e.g. directory
- ;; tracking and the sending of some special characters.
-
- ;; If you wish for ssh mode to prompt you in the minibuffer for
- ;; passwords when a password prompt appears, just enter m-x send-invisible
- ;; and type in your line, or add `comint-watch-for-password-prompt' to
- ;; `comint-output-filter-functions'.
-
- ;;; Code:
-
- (require 'comint)
- (require 'shell)
-
- (defgroup ssh nil
- "Secure remote login interface"
- :group 'processes
- :group 'unix)
-
- (defcustom ssh-program "ssh"
- "*Name of program to invoke ssh"
- :type 'string
- :group 'ssh)
-
- (defcustom ssh-explicit-args '()
- "*List of arguments to pass to ssh on the command line."
- :type '(repeat (string :tag "Argument"))
- :group 'ssh)
-
- (defcustom ssh-mode-hook nil
- "*Hooks to run after setting current buffer to ssh-mode."
- :type 'hook
- :group 'ssh)
-
- (defcustom ssh-process-connection-type t
- "*If non-`nil', use a pty for the local ssh process.
- If `nil', use a pipe (if pipes are supported on the local system).
-
- Generally it is better not to waste ptys on systems which have a static
- number of them. However, ssh won't allocate a pty on the remote host
- unless one is used locally as well."
- :type '(choice (const :tag "ptys" t)
- (const :tag "pipes" nil))
- :group 'ssh)
-
- (defcustom ssh-directory-tracking-mode 'local
- "*Control whether and how to do directory tracking in an ssh buffer.
-
- nil means don't do directory tracking.
-
- t means do so using an ftp remote file name.
-
- Any other value means do directory tracking using local file names.
- This works only if the remote machine and the local one
- share the same directories (through NFS). This is the default.
-
- This variable becomes local to a buffer when set in any fashion for it.
-
- It is better to use the function of the same name to change the behavior of
- directory tracking in an ssh session once it has begun, rather than
- simply setting this variable, since the function does the necessary
- re-synching of directories."
- :type '(choice (const :tag "off" nil)
- (const :tag "ftp" t)
- (const :tag "local" local))
- :group 'ssh)
-
- (make-variable-buffer-local 'ssh-directory-tracking-mode)
-
- (defcustom ssh-host nil
- "*The name of the remote host. This variable is buffer-local."
- :type '(choice (const nil) string)
- :group 'ssh)
-
- (defcustom ssh-remote-user nil
- "*The username used on the remote host.
- This variable is buffer-local and defaults to your local user name.
- If ssh is invoked with the `-l' option to specify the remote username,
- this variable is set from that."
- :type '(choice (const nil) string)
- :group 'ssh)
-
- ;; Initialize ssh mode map.
- (defvar ssh-mode-map '())
- (cond
- ((null ssh-mode-map)
- (setq ssh-mode-map (if (consp shell-mode-map)
- (cons 'keymap shell-mode-map)
- (copy-keymap shell-mode-map)))
- (define-key ssh-mode-map "\C-c\C-c" 'ssh-send-Ctrl-C)
- (define-key ssh-mode-map "\C-c\C-d" 'ssh-send-Ctrl-D)
- (define-key ssh-mode-map "\C-c\C-z" 'ssh-send-Ctrl-Z)
- (define-key ssh-mode-map "\C-c\C-\\" 'ssh-send-Ctrl-backslash)
- (define-key ssh-mode-map "\C-d" 'ssh-delchar-or-send-Ctrl-D)
- (define-key ssh-mode-map "\C-i" 'ssh-tab-or-complete)))
-
-
- ;;;###autoload (add-hook 'same-window-regexps "^\\*ssh-.*\\*\\(\\|<[0-9]+>\\)")
-
- (defvar ssh-history nil)
-
- ;;;###autoload
- (defun ssh (input-args &optional buffer)
- "Open a network login connection via `ssh' with args INPUT-ARGS.
- INPUT-ARGS should start with a host name; it may also contain
- other arguments for `ssh'.
-
- Input is sent line-at-a-time to the remote connection.
-
- Communication with the remote host is recorded in a buffer `*ssh-HOST*'
- \(or `*ssh-USER@HOST*' if the remote username differs\).
- If a prefix argument is given and the buffer `*ssh-HOST*' already exists,
- a new buffer with a different connection will be made.
-
- When called from a program, if the optional second argument BUFFER is
- a string or buffer, it specifies the buffer to use.
-
- The variable `ssh-program' contains the name of the actual program to
- run. It can be a relative or absolute path.
-
- The variable `ssh-explicit-args' is a list of arguments to give to
- the ssh when starting. They are prepended to any arguments given in
- INPUT-ARGS.
-
- If the default value of `ssh-directory-tracking-mode' is t, then the
- default directory in that buffer is set to a remote (FTP) file name to
- access your home directory on the remote machine. Occasionally this causes
- an error, if you cannot access the home directory on that machine. This
- error is harmless as long as you don't try to use that default directory.
-
- If `ssh-directory-tracking-mode' is neither t nor nil, then the default
- directory is initially set up to your (local) home directory.
- This is useful if the remote machine and your local machine
- share the same files via NFS. This is the default.
-
- If you wish to change directory tracking styles during a session, use the
- function `ssh-directory-tracking-mode' rather than simply setting the
- variable."
- (interactive (list
- (read-from-minibuffer "ssh arguments (hostname first): "
- nil nil nil 'ssh-history)
- current-prefix-arg))
-
- (let* ((process-connection-type ssh-process-connection-type)
- (args (ssh-parse-words input-args))
- (host (car args))
- (user (or (car (cdr (member "-l" args)))
- (user-login-name)))
- (buffer-name (if (string= user (user-login-name))
- (format "*ssh-%s*" host)
- (format "*ssh-%s@%s*" user host)))
- proc)
-
- (and ssh-explicit-args
- (setq args (append ssh-explicit-args args)))
-
- (cond ((null buffer))
- ((stringp buffer)
- (setq buffer-name buffer))
- ((bufferp buffer)
- (setq buffer-name (buffer-name buffer)))
- ((numberp buffer)
- (setq buffer-name (format "%s<%d>" buffer-name buffer)))
- (t
- (setq buffer-name (generate-new-buffer-name buffer-name))))
-
- (setq buffer (get-buffer-create buffer-name))
- (pop-to-buffer buffer-name)
-
- (cond
- ((comint-check-proc buffer-name))
- (t
- (comint-exec buffer buffer-name ssh-program nil args)
- (setq proc (get-buffer-process buffer))
- ;; Set process-mark to point-max in case there is text in the
- ;; buffer from a previous exited process.
- (set-marker (process-mark proc) (point-max))
-
- ;; comint-output-filter-functions is just like a hook, except that the
- ;; functions in that list are passed arguments. add-hook serves well
- ;; enough for modifying it.
- ;; comint-output-filter-functions should already have a
- ;; permanent-local property, at least in emacs 19.27 or later.
- (if (fboundp 'make-local-hook)
- (make-local-hook 'comint-output-filter-functions)
- (make-local-variable 'comint-output-filter-functions))
- (add-hook 'comint-output-filter-functions 'ssh-carriage-filter)
-
- (ssh-mode)
-
- (make-local-variable 'ssh-host)
- (setq ssh-host host)
- (make-local-variable 'ssh-remote-user)
- (setq ssh-remote-user user)
-
- (condition-case ()
- (cond ((eq ssh-directory-tracking-mode t)
- ;; Do this here, rather than calling the tracking mode
- ;; function, to avoid a gratuitous resync check; the default
- ;; should be the user's home directory, be it local or remote.
- (setq comint-file-name-prefix
- (concat "/" ssh-remote-user "@" ssh-host ":"))
- (cd-absolute comint-file-name-prefix))
- ((null ssh-directory-tracking-mode))
- (t
- (cd-absolute (concat comint-file-name-prefix "~/"))))
- (error nil))))))
-
- (put 'ssh-mode 'mode-class 'special)
-
- (defun ssh-mode ()
- "Set major-mode for ssh sessions.
- If `ssh-mode-hook' is set, run it."
- (interactive)
- (kill-all-local-variables)
- (shell-mode)
- (setq major-mode 'ssh-mode)
- (setq mode-name "ssh")
- (use-local-map ssh-mode-map)
- (setq shell-dirtrackp ssh-directory-tracking-mode)
- (make-local-variable 'comint-file-name-prefix)
- (run-hooks 'ssh-mode-hook))
-
- (defun ssh-directory-tracking-mode (&optional prefix)
- "Do remote or local directory tracking, or disable entirely.
-
- If called with no prefix argument or a unspecified prefix argument (just
- ``\\[universal-argument]'' with no number) do remote directory tracking via
- ange-ftp. If called as a function, give it no argument.
-
- If called with a negative prefix argument, disable directory tracking
- entirely.
-
- If called with a positive, numeric prefix argument, e.g.
- ``\\[universal-argument] 1 M-x ssh-directory-tracking-mode\'',
- then do directory tracking but assume the remote filesystem is the same as
- the local system. This only works in general if the remote machine and the
- local one share the same directories (through NFS)."
- (interactive "P")
- (cond
- ((or (null prefix)
- (consp prefix))
- (setq ssh-directory-tracking-mode t)
- (setq shell-dirtrackp t)
- (setq comint-file-name-prefix
- (concat "/" ssh-remote-user "@" ssh-host ":")))
- ((< prefix 0)
- (setq ssh-directory-tracking-mode nil)
- (setq shell-dirtrackp nil))
- (t
- (setq ssh-directory-tracking-mode 'local)
- (setq comint-file-name-prefix "")
- (setq shell-dirtrackp t)))
- (cond
- (shell-dirtrackp
- (let* ((proc (get-buffer-process (current-buffer)))
- (proc-mark (process-mark proc))
- (current-input (buffer-substring proc-mark (point-max)))
- (orig-point (point))
- (offset (and (>= orig-point proc-mark)
- (- (point-max) orig-point))))
- (unwind-protect
- (progn
- (delete-region proc-mark (point-max))
- (goto-char (point-max))
- (shell-resync-dirs))
- (goto-char proc-mark)
- (insert current-input)
- (if offset
- (goto-char (- (point-max) offset))
- (goto-char orig-point)))))))
-
-
- ;; Parse a line into its constituent parts (words separated by
- ;; whitespace). Return a list of the words.
- (defun ssh-parse-words (line)
- (let ((list nil)
- (posn 0)
- (match-data (match-data)))
- (while (string-match "[^ \t\n]+" line posn)
- (setq list (cons (substring line (match-beginning 0) (match-end 0))
- list))
- (setq posn (match-end 0)))
- (store-match-data (match-data))
- (nreverse list)))
-
- (defun ssh-carriage-filter (string)
- (let* ((point-marker (point-marker))
- (end (process-mark (get-buffer-process (current-buffer))))
- (beg (or (and (boundp 'comint-last-output-start)
- comint-last-output-start)
- (- end (length string)))))
- (goto-char beg)
- (while (search-forward "\C-m" end t)
- (delete-char -1))
- (goto-char point-marker)))
-
- (defun ssh-send-Ctrl-C ()
- (interactive)
- (send-string nil "\C-c"))
-
- (defun ssh-send-Ctrl-D ()
- (interactive)
- (send-string nil "\C-d"))
-
- (defun ssh-send-Ctrl-Z ()
- (interactive)
- (send-string nil "\C-z"))
-
- (defun ssh-send-Ctrl-backslash ()
- (interactive)
- (send-string nil "\C-\\"))
-
- (defun ssh-delchar-or-send-Ctrl-D (arg)
- "\
- Delete ARG characters forward, or send a C-d to process if at end of buffer."
- (interactive "p")
- (if (eobp)
- (ssh-send-Ctrl-D)
- (delete-char arg)))
-
- (defun ssh-tab-or-complete ()
- "Complete file name if doing directory tracking, or just insert TAB."
- (interactive)
- (if ssh-directory-tracking-mode
- (comint-dynamic-complete)
- (insert "\C-i")))
-
- ;;; ssh.el ends here
-