lisp/ftp.el

   1 ;; File input and output over Internet using FTP
   2 ;; Copyright (C) 1987 Free Software Foundation, Inc.
   3 ;; Author mly@prep.ai.mit.edu.
   4
   5 ;; This file is part of GNU Emacs.
   6
   7 ;; GNU Emacs is free software; you can redistribute it and/or modify
   8 ;; it under the terms of the GNU General Public License as published by
   9 ;; the Free Software Foundation; either version 1, or (at your option)
  10 ;; any later version.
  11
  12 ;; GNU Emacs is distributed in the hope that it will be useful,
  13 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
  14 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15 ;; GNU General Public License for more details.
  16
  17 ;; You should have received a copy of the GNU General Public License
  18 ;; along with GNU Emacs; see the file COPYING.  If not, write to
  19 ;; the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
  20
  21 ;; Prevent changes in major modes from altering these variables.
  22 (put 'ftp-temp-file-name 'permanent-local t)
  23 (put 'ftp-file 'permanent-local t)
  24 (put 'ftp-host 'permanent-local t)
  25
  26 ;; you can turn this off by doing
  27 ;;  (setq ftp-password-alist 'compulsory-urinalysis)
  28 (defvar ftp-password-alist () "Security sucks")
  29
  30 (defun read-ftp-user-password (host user new)
  31   (let (tem)
  32     (if (and (not new)
  33              (listp ftp-password-alist)
  34              (setq tem (cdr (assoc host ftp-password-alist)))
  35              (or (null user)
  36                  (string= user (car tem))))
  37         tem
  38       (or user
  39           (progn
  40             (setq tem (or (and (listp ftp-password-alist)
  41                                (car (cdr (assoc host ftp-password-alist))))
  42                           (user-login-name)))
  43             (setq user (read-string (format
  44                                       "User-name for %s (default \"%s\"): "
  45                                       host tem)))
  46             (if (equal user "") (setq user tem))))
  47       (setq tem (cons user
  48                       ;; If you want to use some non-echoing string-reader,
  49                       ;; feel free to write it yourself.  I don't care enough.
  50                       (read-string (format "Password for %s@%s: " user host)
  51                         (if (not (listp ftp-password-alist))
  52                             ""
  53                           (or (cdr (cdr (assoc host ftp-password-alist)))
  54                               (let ((l ftp-password-alist))
  55                                 (catch 'foo
  56                                   (while l
  57                                     (if (string= (car (cdr (car l))) user)
  58                                         (throw 'foo (cdr (cdr (car l))))
  59                                       (setq l (cdr l))))
  60                                   nil))
  61                               "")))))
  62       (message "")
  63       (if (and (listp ftp-password-alist)
  64                (not (string= (cdr tem) "")))
  65           (setq ftp-password-alist (cons (cons host tem)
  66                                          ftp-password-alist)))
  67       tem)))
  68
  69 (defun ftp-read-file-name (prompt)
  70   (let ((s ""))
  71     (while (not (string-match "\\`[ \t]*\\([^ \t:]+\\)[ \t]*:\\(.+\\)\\'" s))
  72       (setq s (read-string prompt s)))
  73     (list (substring s (match-beginning 1) (match-end 1))
  74           (substring s (match-beginning 2) (match-end 2)))))
  75
  76
  77 ;;;###autoload
  78 (defun ftp-find-file (host file &optional user password)
  79   "FTP to HOST to get FILE, logging in as USER with password PASSWORD.
  80 Interactively, HOST and FILE are specified by reading a string with
  81  a colon character separating the host from the filename.
  82 USER and PASSWORD are defaulted from the values used when
  83  last ftping from HOST (unless password-remembering is disabled).
  84  Supply a password of the symbol `t' to override this default
  85  (interactively, this is done by giving a prefix arg)"
  86   (interactive
  87         (append (ftp-read-file-name "FTP get host:file: ")
  88                 (list nil (not (null current-prefix-arg)))))
  89   (ftp-find-file-or-directory host file t user password))
  90
  91 ;;;###autoload
  92 (defun ftp-list-directory (host file &optional user password)
  93   "FTP to HOST to list DIRECTORY, logging in as USER with password PASSWORD.
  94 Interactively, HOST and FILE are specified by reading a string with
  95  a colon character separating the host from the filename.
  96 USER and PASSWORD are defaulted from the values used when
  97  last ftping from HOST (unless password-remembering is disabled).
  98  Supply a password of the symbol `t' to override this default
  99  (interactively, this is done by giving a prefix arg)"
 100   (interactive
 101         (append (ftp-read-file-name "FTP get host:directory: ")
 102                 (list nil (not (null current-prefix-arg)))))
 103   (ftp-find-file-or-directory host file nil user password))
 104
 105 (defun ftp-find-file-or-directory (host file filep &optional user password)
 106   "FTP to HOST to get FILE.  Third arg is t for file, nil for directory.
 107 Log in as USER with PASSWORD.  If USER is nil or PASSWORD is nil or t,
 108 we prompt for the user name and password."
 109   (or (and user password (not (eq password t)))
 110       (progn (setq user (read-ftp-user-password host user (eq password t))
 111                    password (cdr user)
 112                    user (car user))))
 113   (let ((buffer (get-buffer-create (format "*ftp%s %s:%s*"
 114                                            (if filep "" "-directory")
 115                                            host file))))
 116     (set-buffer buffer)
 117     (let ((process nil)
 118           (case-fold-search nil))
 119       (let ((win nil))
 120         (unwind-protect
 121             (progn
 122               (setq process (ftp-setup-buffer host file))
 123               (if (setq win (ftp-login process host user password))
 124                   (message "Logged in")
 125                 (error "Ftp login failed")))
 126           (or win (and process (delete-process process)))))
 127       (message "Opening %s %s:%s..." (if filep "file" "directory")
 128                host file)
 129       (if (ftp-command process
 130                        (format "%s \"%s\" -\nquit\n" (if filep "get" "dir")
 131                                file)
 132                        "\\(150\\|125\\).*\n"
 133                        "200.*\n")
 134           (progn (forward-line 1)
 135                  (let ((buffer-read-only nil))
 136                    (delete-region (point-min) (point)))
 137                  (message "Retrieving %s:%s in background.  Bye!" host file)
 138                  (set-process-sentinel process
 139                                        'ftp-asynchronous-input-sentinel)
 140                  process)
 141         (switch-to-buffer buffer)
 142         (let ((buffer-read-only nil))
 143           (insert-before-markers "<<<Ftp lost>>>"))
 144         (delete-process process)
 145         (error "Ftp %s:%s lost" host file)))))
 146
 147 \f
 148 ;;;###autoload
 149 (defun ftp-write-file (host file &optional user password)
 150   "FTP to HOST to write FILE, logging in as USER with password PASSWORD.
 151 Interactively, HOST and FILE are specified by reading a string with colon
 152 separating the host from the filename.
 153 USER and PASSWORD are defaulted from the values used when
 154  last ftping from HOST (unless `password-remembering' is disabled).
 155  Supply a password of the symbol `t' to override this default
 156  (interactively, this is done by giving a prefix arg)"
 157   (interactive
 158     (append (ftp-read-file-name "FTP write host:file: ")
 159             (list nil (not (null current-prefix-arg)))))
 160   (or (and user password (not (eq password t)))
 161       (progn (setq user (read-ftp-user-password host user (eq password t))
 162                    password (cdr user)
 163                    user (car user))))
 164   (let ((buffer (get-buffer-create (format "*ftp %s:%s*" host file)))
 165         (tmp (make-temp-name "/tmp/emacsftp")))
 166     (write-region (point-min) (point-max) tmp)
 167     (save-excursion
 168       (set-buffer buffer)
 169       (make-local-variable 'ftp-temp-file-name)
 170       (setq ftp-temp-file-name tmp)
 171       (let ((process (ftp-setup-buffer host file))
 172             (case-fold-search nil))
 173         (let ((win nil))
 174           (unwind-protect
 175               (if (setq win (ftp-login process host user password))
 176                   (message "Logged in")
 177                 (error "Ftp login lost"))
 178             (or win (delete-process process))))
 179         (message "Opening file %s:%s..." host file)
 180         (if (ftp-command process
 181                          (format "send \"%s\" \"%s\"\nquit\n" tmp file)
 182                          "\\(150\\|125\\).*\n"
 183                          "200.*\n")
 184             (progn (forward-line 1)
 185                    (setq foo1 (current-buffer))
 186                    (let ((buffer-read-only nil))
 187                      (delete-region (point-min) (point)))
 188                    (message "Saving %s:%s in background.  Bye!" host file)
 189                    (set-process-sentinel process
 190                                          'ftp-asynchronous-output-sentinel)
 191                    process)
 192           (switch-to-buffer buffer)
 193           (setq foo2 (current-buffer))
 194           (let ((buffer-read-only nil))
 195             (insert-before-markers "<<<Ftp lost>>>"))
 196           (delete-process process)
 197           (error "Ftp write %s:%s lost" host file))))))
 198
 199 \f
 200 (defun ftp-setup-buffer (host file)
 201   (fundamental-mode)
 202   (and (get-buffer-process (current-buffer))
 203        (progn (discard-input)
 204               (if (y-or-n-p (format "Kill process \"%s\" in %s? "
 205                                     (process-name (get-buffer-process
 206                                                     (current-buffer)))
 207                                     (buffer-name (current-buffer))))
 208                   (while (get-buffer-process (current-buffer))
 209                     (kill-process (get-buffer-process (current-buffer))))
 210                 (error "Foo"))))
 211   ;(buffer-disable-undo (current-buffer))
 212   (setq buffer-read-only nil)
 213   (erase-buffer)
 214   (make-local-variable 'ftp-host)
 215   (setq ftp-host host)
 216   (make-local-variable 'ftp-file)
 217   (setq ftp-file file)
 218   (setq foo3 (current-buffer))
 219   (setq buffer-read-only t)
 220   (start-process "ftp" (current-buffer) "ftp" "-i" "-n" "-g"))
 221
 222
 223 (defun ftp-login (process host user password)
 224   (message "FTP logging in as %s@%s..." user host)
 225   (if (ftp-command process
 226                    (format "open %s\nuser %s %s\n" host user password)
 227                    "230.*\n"
 228                    "\\(Connected to \\|220\\|331\\|Remote system type\\|Using.*mode\\|Remember to set\\).*\n")
 229       t
 230     (switch-to-buffer (process-buffer process))
 231     (delete-process process)
 232     (if (listp ftp-password-alist)
 233         (setq ftp-password-alist (delq (assoc host ftp-password-alist)
 234                                        ftp-password-alist)))
 235     nil))
 236
 237 (defun ftp-command (process command win ignore)
 238   (process-send-string process command)
 239   (let ((p 1))
 240     (while (numberp p)
 241       (cond ;((not (bolp)))
 242             ((looking-at "^[0-9]+-")
 243              (while (not (re-search-forward "^[0-9]+ " nil t))
 244                (save-excursion
 245                  (accept-process-output process)))
 246              (beginning-of-line))
 247             ((looking-at win)
 248              (goto-char (point-max))
 249              (setq p t))
 250             ((looking-at "^ftp> \\|^\n")
 251              (goto-char (match-end 0)))
 252             ((looking-at ignore)
 253              ;; Ignore status messages whose codes indicate no problem.
 254              (forward-line 1))
 255             ((not (search-forward "\n" nil t))
 256              ;; the way asynchronous process-output works with (point)
 257              ;;  is really really disgusting.
 258              (setq p (point))
 259              (condition-case ()
 260                  (accept-process-output process)
 261                (error nil))
 262              (goto-char p))
 263             ((looking-at "^[a-z]")
 264              ;; Ignore any lines that don't have error codes.
 265              (forward-line 1))
 266             (t
 267              (setq p nil))))
 268     p))
 269
 270
 271 (defun ftp-asynchronous-input-sentinel (process msg)
 272   (ftp-sentinel process msg t t))
 273 (defun ftp-synchronous-input-sentinel (process msg)
 274   (ftp-sentinel process msg nil t))
 275 (defun ftp-asynchronous-output-sentinel (process msg)
 276   (ftp-sentinel process msg t nil))
 277 (defun ftp-synchronous-output-sentinel (process msg)
 278   (ftp-sentinel process msg nil nil))
 279
 280 (defun ftp-sentinel (process msg asynchronous input)
 281   (cond ((null (buffer-name (process-buffer process)))
 282          ;; deleted buffer
 283          (set-process-buffer process nil))
 284         ((and (eq (process-status process) 'exit)
 285               (= (process-exit-status process) 0))
 286          (save-excursion
 287            (set-buffer (process-buffer process))
 288            (let (msg
 289                  (r (if input "[0-9]+ bytes received in [0-9]+\\.[0-9]+ seconds.*$" "[0-9]+ bytes sent in [0-9]+\\.[0-9]+ seconds.*$")))
 290              (goto-char (point-max))
 291              (search-backward "226 ")
 292              (if (looking-at r)
 293                  (search-backward "226 "))
 294              (let ((p (point)))
 295                (setq msg (concat (format "ftp %s %s:%s done"
 296                                          (if input "read" "write")
 297                                          ftp-host ftp-file)
 298                                  (if (re-search-forward r nil t)
 299                                      (concat ": " (buffer-substring
 300                                                    (match-beginning 0)
 301                                                    (match-end 0)))
 302                                    "")))
 303                (delete-region p (point-max))
 304                (save-excursion
 305                  (set-buffer (get-buffer-create "*ftp log*"))
 306                  (let ((buffer-read-only nil))
 307                    (insert msg ?\n))))
 308              ;; Note the preceding let must end here
 309              ;; so it doesn't cross the (kill-buffer (current-buffer)).
 310              (if (not input)
 311                  (progn
 312                    (condition-case ()
 313                        (and (boundp 'ftp-temp-file-name)
 314                             ftp-temp-file-name
 315                             (delete-file ftp-temp-file-name))
 316                      (error nil))
 317                    ;; Kill the temporary buffer which the ftp process
 318                    ;; puts its output in.
 319                    (kill-buffer (current-buffer)))
 320                ;; You don't want to look at this.
 321                (let ((kludge (generate-new-buffer (format "%s:%s (ftp)"
 322                                                           ftp-host ftp-file))))
 323                  (setq kludge (prog1 (buffer-name kludge) (kill-buffer kludge)))
 324                  (rename-buffer kludge)
 325                  ;; ok, you can look again now.
 326                  (set-buffer-modified-p nil)
 327                  (ftp-setup-write-file-hooks)))
 328              (if (and asynchronous
 329                       ;(waiting-for-user-input-p)
 330                       )
 331                  (progn (message "%s" msg)
 332                         (sleep-for 2))))))
 333         ((memq (process-status process) '(exit signal))
 334          (save-excursion
 335            (set-buffer (process-buffer process))
 336            (setq msg (format "Ftp died (buffer %s): %s"
 337                              (buffer-name (current-buffer))
 338                              msg))
 339            (let ((buffer-read-only nil))
 340              (goto-char (point-max))
 341              (insert ?\n ?\n msg))
 342            (delete-process proc)
 343            (set-buffer (get-buffer-create "*ftp log*"))
 344            (let ((buffer-read-only nil))
 345              (goto-char (point-max))
 346              (insert msg))
 347            (if (waiting-for-user-input-p)
 348                (error "%s" msg))))))
 349
 350 (defun ftp-setup-write-file-hooks ()
 351   (let ((hooks write-file-hooks))
 352     (make-local-variable 'write-file-hooks)
 353     (setq write-file-hooks (append write-file-hooks
 354                                    '(ftp-write-file-hook))))
 355   (make-local-variable 'revert-buffer-function)
 356   (setq revert-buffer-function 'ftp-revert-buffer)
 357   (setq default-directory "/tmp/")
 358   (setq buffer-file-name (concat default-directory
 359                                  (make-temp-name
 360                                   (buffer-name (current-buffer)))))
 361   (setq buffer-read-only nil))
 362
 363 (defun ftp-write-file-hook ()
 364   (let ((process (ftp-write-file ftp-host ftp-file)))
 365     (set-process-sentinel process 'ftp-synchronous-output-sentinel)
 366     (message "FTP writing %s:%s..." ftp-host ftp-file)
 367     (while (eq (process-status process) 'run)
 368       (condition-case ()
 369           (accept-process-output process)
 370         (error nil)))
 371     (set-buffer-modified-p nil)
 372     (message "FTP writing %s:%s...done" ftp-host ftp-file))
 373   t)
 374
 375 (defun ftp-revert-buffer (&rest ignore)
 376   (let ((process (ftp-find-file ftp-host ftp-file)))
 377     (set-process-sentinel process 'ftp-synchronous-input-sentinel)
 378     (message "FTP reverting %s:%s" ftp-host ftp-file)
 379     (while (eq (process-status process) 'run)
 380       (condition-case ()
 381           (accept-process-output process)
 382         (error nil)))
 383     (and (eq (process-status process) 'exit)
 384          (= (process-exit-status process) 0)
 385          (set-buffer-modified-p nil))
 386     (message "Reverted")))