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1 ;;; rlogin.el --- remote login interface
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2
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3 ;; Author: Noah Friedman
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4 ;; Maintainer: Noah Friedman <friedman@prep.ai.mit.edu>
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5 ;; Keywords: unix, comm
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6
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7 ;; Copyright (C) 1992, 1993, 1994, 1995 Free Software Foundation, Inc.
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8 ;;
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9 ;; This program is free software; you can redistribute it and/or modify
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10 ;; it under the terms of the GNU General Public License as published by
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11 ;; the Free Software Foundation; either version 2, or (at your option)
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12 ;; any later version.
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13 ;;
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14 ;; This program is distributed in the hope that it will be useful,
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15 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
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16 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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17 ;; GNU General Public License for more details.
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18 ;;
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19 ;; You should have received a copy of the GNU General Public License
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20 ;; along with this program; if not, write to: The Free Software Foundation,
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21 ;; Inc.; 675 Massachusetts Avenue.; Cambridge, MA 02139, USA.
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22
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70
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23 ;; $Id: rlogin.el,v 1.1.1.1 1996/12/18 22:42:36 steve Exp $
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24
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25 ;;; Commentary:
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26
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27 ;; Support for remote logins using `rlogin'.
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28 ;; This program is layered on top of shell.el; the code here only accounts
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29 ;; for the variations needed to handle a remote process, e.g. directory
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30 ;; tracking and the sending of some special characters.
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31
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32 ;; If you wish for rlogin mode to prompt you in the minibuffer for
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33 ;; passwords when a password prompt appears, just enter m-x send-invisible
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34 ;; and type in your line, or add `comint-watch-for-password-prompt' to
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35 ;; `comint-output-filter-functions'.
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36
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37 ;;; Code:
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38
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39 (require 'comint)
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40 (require 'shell)
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41
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42 (defvar rlogin-program "rlogin"
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43 "*Name of program to invoke rlogin")
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44
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45 (defvar rlogin-explicit-args nil
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46 "*List of arguments to pass to rlogin on the command line.")
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47
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48 (defvar rlogin-mode-hook nil
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49 "*Hooks to run after setting current buffer to rlogin-mode.")
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50
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51 (defvar rlogin-process-connection-type nil
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52 "*If non-`nil', use a pty for the local rlogin process.
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53 If `nil', use a pipe (if pipes are supported on the local system).
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54
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55 Generally it is better not to waste ptys on systems which have a static
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56 number of them. On the other hand, some implementations of `rlogin' assume
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57 a pty is being used, and errors will result from using a pipe instead.")
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58
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59 (defvar rlogin-directory-tracking-mode 'local
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60 "*Control whether and how to do directory tracking in an rlogin buffer.
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61
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62 nil means don't do directory tracking.
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63
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64 t means do so using an ftp remote file name.
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65
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66 Any other value means do directory tracking using local file names.
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67 This works only if the remote machine and the local one
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68 share the same directories (through NFS). This is the default.
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69
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70 This variable becomes local to a buffer when set in any fashion for it.
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71
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72 It is better to use the function of the same name to change the behavior of
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73 directory tracking in an rlogin session once it has begun, rather than
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74 simply setting this variable, since the function does the necessary
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75 re-synching of directories.")
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76
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77 (make-variable-buffer-local 'rlogin-directory-tracking-mode)
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78
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79 (defvar rlogin-host nil
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80 "*The name of the remote host. This variable is buffer-local.")
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81
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82 (defvar rlogin-remote-user nil
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83 "*The username used on the remote host.
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84 This variable is buffer-local and defaults to your local user name.
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85 If rlogin is invoked with the `-l' option to specify the remote username,
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86 this variable is set from that.")
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87
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88 ;; Initialize rlogin mode map.
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89 (defvar rlogin-mode-map '())
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90 (cond
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91 ((null rlogin-mode-map)
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92 (setq rlogin-mode-map (if (consp shell-mode-map)
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93 (cons 'keymap shell-mode-map)
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94 (copy-keymap shell-mode-map)))
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95 (define-key rlogin-mode-map "\C-c\C-c" 'rlogin-send-Ctrl-C)
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96 (define-key rlogin-mode-map "\C-c\C-d" 'rlogin-send-Ctrl-D)
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97 (define-key rlogin-mode-map "\C-c\C-z" 'rlogin-send-Ctrl-Z)
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98 (define-key rlogin-mode-map "\C-c\C-\\" 'rlogin-send-Ctrl-backslash)
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99 (define-key rlogin-mode-map "\C-d" 'rlogin-delchar-or-send-Ctrl-D)
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100 (define-key rlogin-mode-map "\C-i" 'rlogin-tab-or-complete)))
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101
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102
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103 ;;;###autoload (add-hook 'same-window-regexps "^\\*rlogin-.*\\*\\(\\|<[0-9]+>\\)")
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104
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105 (defvar rlogin-history nil)
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106
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107 ;;;###autoload
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108 (defun rlogin (input-args &optional buffer)
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109 "Open a network login connection to HOST via the `rlogin' program.
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110 Input is sent line-at-a-time to the remote connection.
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111
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112 Communication with the remote host is recorded in a buffer `*rlogin-HOST*'
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113 \(or `*rlogin-USER@HOST*' if the remote username differs\).
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114 If a prefix argument is given and the buffer `*rlogin-HOST*' already exists,
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115 a new buffer with a different connection will be made.
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116
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117 When called from a program, if the optional second argument is a string or
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118 buffer, it names the buffer to use.
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119
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120 The variable `rlogin-program' contains the name of the actual program to
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121 run. It can be a relative or absolute path.
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122
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123 The variable `rlogin-explicit-args' is a list of arguments to give to
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124 the rlogin when starting. They are added after any arguments given in
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125 INPUT-ARGS.
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126
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127 If the default value of `rlogin-directory-tracking-mode' is t, then the
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128 default directory in that buffer is set to a remote (FTP) file name to
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129 access your home directory on the remote machine. Occasionally this causes
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130 an error, if you cannot access the home directory on that machine. This
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131 error is harmless as long as you don't try to use that default directory.
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132
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133 If `rlogin-directory-tracking-mode' is neither t nor nil, then the default
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134 directory is initially set up to your (local) home directory.
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135 This is useful if the remote machine and your local machine
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136 share the same files via NFS. This is the default.
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137
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138 If you wish to change directory tracking styles during a session, use the
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139 function `rlogin-directory-tracking-mode' rather than simply setting the
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140 variable."
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141 (interactive (list
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142 (read-from-minibuffer "rlogin arguments (hostname first): "
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143 nil nil nil 'rlogin-history)
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144 current-prefix-arg))
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145
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146 (let* ((process-connection-type rlogin-process-connection-type)
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147 (args (if rlogin-explicit-args
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148 (append (rlogin-parse-words input-args)
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149 rlogin-explicit-args)
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150 (rlogin-parse-words input-args)))
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151 (host (car args))
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152 (user (or (car (cdr (member "-l" args)))
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153 (user-login-name)))
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154 (buffer-name (if (string= user (user-login-name))
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155 (format "*rlogin-%s*" host)
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156 (format "*rlogin-%s@%s*" user host)))
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157 proc)
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158
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159 (cond ((null buffer))
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160 ((or (stringp buffer) (bufferp buffer))
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161 (setq buffer-name buffer))
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162 ((numberp buffer)
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163 (setq buffer-name (format "%s<%d>" buffer-name buffer)))
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164 (t
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165 (setq buffer-name (generate-new-buffer-name buffer-name))))
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166
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167 (pop-to-buffer buffer-name)
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168 (cond
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169 ((comint-check-proc buffer-name))
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170 (t
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171 (comint-exec (current-buffer) buffer-name rlogin-program nil args)
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172 (setq proc (get-process buffer-name))
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173 ;; Set process-mark to point-max in case there is text in the
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174 ;; buffer from a previous exited process.
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175 (set-marker (process-mark proc) (point-max))
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176 (rlogin-mode)
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177
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178 ;; comint-output-filter-functions is just like a hook, except that the
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179 ;; functions in that list are passed arguments. add-hook serves well
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180 ;; enough for modifying it.
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181 (add-hook 'comint-output-filter-functions 'rlogin-carriage-filter)
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182
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183 (make-local-variable 'rlogin-host)
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184 (setq rlogin-host host)
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185 (make-local-variable 'rlogin-remote-user)
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186 (setq rlogin-remote-user user)
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187
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188 (cond
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189 ((eq rlogin-directory-tracking-mode t)
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190 ;; Do this here, rather than calling the tracking mode function, to
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191 ;; avoid a gratuitous resync check; the default should be the
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192 ;; user's home directory, be it local or remote.
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193 (setq comint-file-name-prefix
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194 (concat "/" rlogin-remote-user "@" rlogin-host ":"))
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195 (cd-absolute comint-file-name-prefix))
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196 ((null rlogin-directory-tracking-mode))
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197 (t
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198 (cd-absolute (concat comint-file-name-prefix "~/"))))))))
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199
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200 (defun rlogin-mode ()
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201 "Set major-mode for rlogin sessions.
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202 If `rlogin-mode-hook' is set, run it."
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203 (interactive)
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204 (kill-all-local-variables)
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205 (shell-mode)
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206 (setq major-mode 'rlogin-mode)
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207 (setq mode-name "rlogin")
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208 (use-local-map rlogin-mode-map)
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209 (setq shell-dirtrackp rlogin-directory-tracking-mode)
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210 (make-local-variable 'comint-file-name-prefix)
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211 (run-hooks 'rlogin-mode-hook))
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212
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213 (defun rlogin-directory-tracking-mode (&optional prefix)
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214 "Do remote or local directory tracking, or disable entirely.
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215
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216 If called with no prefix argument or a unspecified prefix argument (just
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217 ``\\[universal-argument]'' with no number) do remote directory tracking via
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218 ange-ftp. If called as a function, give it no argument.
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219
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220 If called with a negative prefix argument, disable directory tracking
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221 entirely.
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222
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223 If called with a positive, numeric prefix argument, e.g.
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224 ``\\[universal-argument] 1 M-x rlogin-directory-tracking-mode\'',
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225 then do directory tracking but assume the remote filesystem is the same as
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226 the local system. This only works in general if the remote machine and the
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227 local one share the same directories (through NFS)."
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228 (interactive "P")
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229 (cond
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230 ((or (null prefix)
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231 (consp prefix))
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232 (setq rlogin-directory-tracking-mode t)
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233 (setq shell-dirtrackp t)
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234 (setq comint-file-name-prefix
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235 (concat "/" rlogin-remote-user "@" rlogin-host ":")))
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236 ((< prefix 0)
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237 (setq rlogin-directory-tracking-mode nil)
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238 (setq shell-dirtrackp nil))
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239 (t
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240 (setq rlogin-directory-tracking-mode 'local)
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241 (setq comint-file-name-prefix "")
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242 (setq shell-dirtrackp t)))
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243 (cond
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244 (shell-dirtrackp
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245 (let* ((proc (get-buffer-process (current-buffer)))
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246 (proc-mark (process-mark proc))
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247 (current-input (buffer-substring proc-mark (point-max)))
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248 (orig-point (point))
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249 (offset (and (>= orig-point proc-mark)
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250 (- (point-max) orig-point))))
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251 (unwind-protect
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252 (progn
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253 (delete-region proc-mark (point-max))
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254 (goto-char (point-max))
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255 (shell-resync-dirs))
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256 (goto-char proc-mark)
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257 (insert current-input)
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258 (if offset
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259 (goto-char (- (point-max) offset))
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260 (goto-char orig-point)))))))
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261
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262
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263 ;; Parse a line into its constituent parts (words separated by
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264 ;; whitespace). Return a list of the words.
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265 (defun rlogin-parse-words (line)
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266 (let ((list nil)
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267 (posn 0)
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268 (match-data (match-data)))
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269 (while (string-match "[^ \t\n]+" line posn)
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270 (setq list (cons (substring line (match-beginning 0) (match-end 0))
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271 list))
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272 (setq posn (match-end 0)))
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273 (store-match-data (match-data))
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274 (nreverse list)))
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275
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276 (defun rlogin-carriage-filter (string)
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277 (let* ((point-marker (point-marker))
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278 (end (process-mark (get-buffer-process (current-buffer))))
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279 (beg (or (and (boundp 'comint-last-output-start)
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280 comint-last-output-start)
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281 (- end (length string)))))
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282 (goto-char beg)
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283 (while (search-forward "\C-m" end t)
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284 (delete-char -1))
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285 (goto-char point-marker)))
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286
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287 (defun rlogin-send-Ctrl-C ()
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288 (interactive)
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289 (send-string nil "\C-c"))
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290
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291 (defun rlogin-send-Ctrl-D ()
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292 (interactive)
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293 (send-string nil "\C-d"))
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294
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295 (defun rlogin-send-Ctrl-Z ()
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296 (interactive)
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297 (send-string nil "\C-z"))
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298
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299 (defun rlogin-send-Ctrl-backslash ()
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300 (interactive)
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301 (send-string nil "\C-\\"))
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302
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303 (defun rlogin-delchar-or-send-Ctrl-D (arg)
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304 "\
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305 Delete ARG characters forward, or send a C-d to process if at end of buffer."
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306 (interactive "p")
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307 (if (eobp)
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308 (rlogin-send-Ctrl-D)
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309 (delete-char arg)))
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310
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311 (defun rlogin-tab-or-complete ()
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312 "Complete file name if doing directory tracking, or just insert TAB."
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313 (interactive)
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314 (if rlogin-directory-tracking-mode
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315 (comint-dynamic-complete)
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316 (insert "\C-i")))
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317
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318 ;;; rlogin.el ends here
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