2003-02-05 Kai Gro�ohann <kai.grossjohann@uni-duisburg.de>

[emacs.git] / lisp / net / tramp-smb.el

;;; tramp-smb.el --- Tramp access functions for SMB servers -*- coding: iso-8859-1; -*-

;; Copyright (C) 2002, 2003 Free Software Foundation, Inc.

;; Author: Michael Albinus <Michael.Albinus@alcatel.de>
;; Keywords: comm, processes

;; This file is part of GNU Emacs.

;; GNU Emacs 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.

;; GNU Emacs 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 GNU Emacs; see the file COPYING.  If not, write to the
;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
;; Boston, MA 02111-1307, USA.

;;; Commentary:

;; Access functions for SMB servers like SAMBA or M$ Windows from Tramp.

;;; Code:

(require 'tramp)

;; Pacify byte-compiler
(eval-when-compile
  (require 'cl)
  (require 'custom)
  ;; Emacs 19.34 compatibility hack -- is this needed?
  (or (>= emacs-major-version 20)
      (load "cl-seq")))

;; Define SMB method ...
(defcustom tramp-smb-method "smb"
  "*Method to connect SAMBA and M$ SMB servers."
  :group 'tramp
  :type 'string)

;; ... and add it to the method list.
(add-to-list 'tramp-methods (cons tramp-smb-method nil))

;; Add a default for `tramp-default-method-alist'. Rule: If there is
;; a domain in USER, it must be the SMB method.
(add-to-list 'tramp-default-method-alist
             (list "%" "" tramp-smb-method))

;; Add completion function for SMB method.
(tramp-set-completion-function
 tramp-smb-method
 '((tramp-parse-netrc "~/.netrc")))

(defcustom tramp-smb-program "smbclient"
  "*Name of SMB client to run."
  :group 'tramp
  :type 'string)

(defconst tramp-smb-prompt "^smb: \\S-+> "
  "Regexp used as prompt in smbclient.")

(defconst tramp-smb-errors
  (mapconcat
   'identity
   '(; Connection error
     "Connection to \\S-+ failed"
     ; Samba
     "ERRSRV"
     "ERRDOS"
     "ERRbadfile"
     "ERRbadpw"
     "ERRfilexists"
     "ERRnoaccess"
     "ERRnomem"
     "ERRnosuchshare"
     ; Windows NT 4.0, Windows 5.0 (Windows 2000), Windows 5.1 (Windows XP)
     "NT_STATUS_ACCESS_DENIED"
     "NT_STATUS_BAD_NETWORK_NAME"
     "NT_STATUS_CANNOT_DELETE"
     "NT_STATUS_LOGON_FAILURE"
     "NT_STATUS_NO_SUCH_FILE"
     "NT_STATUS_OBJECT_NAME_INVALID"
     "NT_STATUS_OBJECT_NAME_NOT_FOUND"
     "NT_STATUS_SHARING_VIOLATION")
   "\\|")
  "Regexp for possible error strings of SMB servers.
Used instead of analyzing error codes of commands.")

(defvar tramp-smb-share nil
  "Holds the share name for the current buffer.
This variable is local to each buffer.")
(make-variable-buffer-local 'tramp-smb-share)

(defvar tramp-smb-share-cache nil
  "Caches the share names accessible to host related to the current buffer.
This variable is local to each buffer.")
(make-variable-buffer-local 'tramp-smb-share-cache)

(defvar tramp-smb-process-running nil
  "Flag whether a corresponding process is still running.
Will be changed by corresponding `process-sentinel'.
This variable is local to each buffer.")
(make-variable-buffer-local 'tramp-smb-process-running)

(defvar tramp-smb-inodes nil
  "Keeps virtual inodes numbers for SMB files.")

;; New handlers should be added here.
(defconst tramp-smb-file-name-handler-alist
  '(
    ;; `access-file' performed by default handler
    (add-name-to-file . tramp-smb-handle-copy-file) ;; we're on Windows, honey.
    ;; `byte-compiler-base-file-name' performed by default handler
    (copy-file . tramp-smb-handle-copy-file)
    (delete-directory . tramp-smb-handle-delete-directory)
    (delete-file . tramp-smb-handle-delete-file)
    ;; `diff-latest-backup-file' performed by default handler
    (directory-file-name . tramp-handle-directory-file-name)
    (directory-files . tramp-smb-handle-directory-files)
    (directory-files-and-attributes . tramp-smb-handle-directory-files-and-attributes)
    (dired-call-process . tramp-smb-not-handled)
    (dired-compress-file . tramp-smb-not-handled)
    ;; `dired-uncache' performed by default handler
    ;; `expand-file-name' not necessary because we cannot expand "~/"
    (file-accessible-directory-p . tramp-smb-handle-file-directory-p)
    (file-attributes . tramp-smb-handle-file-attributes)
    (file-directory-p .  tramp-smb-handle-file-directory-p)
    (file-executable-p . tramp-smb-handle-file-exists-p)
    (file-exists-p . tramp-smb-handle-file-exists-p)
    (file-local-copy . tramp-smb-handle-file-local-copy)
    (file-modes . tramp-handle-file-modes)
    (file-name-all-completions . tramp-smb-handle-file-name-all-completions)
    ;; `file-name-as-directory' performed by default handler
    (file-name-completion . tramp-handle-file-name-completion)
    (file-name-directory . tramp-handle-file-name-directory)
    (file-name-nondirectory . tramp-handle-file-name-nondirectory)
    ;; `file-name-sans-versions' performed by default handler
    (file-newer-than-file-p . tramp-smb-handle-file-newer-than-file-p)
    (file-ownership-preserved-p . tramp-smb-not-handled)
    (file-readable-p . tramp-smb-handle-file-exists-p)
    (file-regular-p . tramp-handle-file-regular-p)
    (file-symlink-p . tramp-smb-not-handled)
    ;; `file-truename' performed by default handler
    (file-writable-p . tramp-smb-handle-file-writable-p)
    ;; `find-backup-file-name' performed by default handler
    ;; `find-file-noselect' performed by default handler
    ;; `get-file-buffer' performed by default handler
    (insert-directory . tramp-smb-handle-insert-directory)
    (insert-file-contents . tramp-handle-insert-file-contents)
    (load . tramp-handle-load)
    (make-directory . tramp-smb-handle-make-directory)
    (make-directory-internal . tramp-smb-handle-make-directory-internal)
    (make-symbolic-link . tramp-smb-not-handled)
    (rename-file . tramp-smb-handle-rename-file)
    (set-file-modes . tramp-smb-not-handled)
    (set-visited-file-modtime . tramp-smb-not-handled)
    (shell-command . tramp-smb-not-handled)
    ;; `substitute-in-file-name' performed by default handler
    (unhandled-file-name-directory . tramp-handle-unhandled-file-name-directory)
    (vc-registered . tramp-smb-not-handled)
    (verify-visited-file-modtime . tramp-smb-not-handled)
    (write-region . tramp-smb-handle-write-region)
)
  "Alist of handler functions for Tramp SMB method.
Operations not mentioned here will be handled by the default Emacs primitives.")

(defun tramp-smb-file-name-p (filename)
  "Check if it's a filename for SMB servers."
  (let ((v (tramp-dissect-file-name filename)))
    (string=
     (tramp-find-method
      (tramp-file-name-multi-method v)
      (tramp-file-name-method v)
      (tramp-file-name-user v)
      (tramp-file-name-host v))
     tramp-smb-method)))

(defun tramp-smb-file-name-handler (operation &rest args)
  "Invoke the SMB related OPERATION.
First arg specifies the OPERATION, second arg is a list of arguments to
pass to the OPERATION."
  (let ((fn (assoc operation tramp-smb-file-name-handler-alist)))
    (if fn
        (if (eq (cdr fn) 'tramp-smb-not-handled)
            (apply (cdr fn) operation args)
          (save-match-data (apply (cdr fn) args)))
      (tramp-run-real-handler operation args))))

(add-to-list 'tramp-foreign-file-name-handler-alist
             (cons 'tramp-smb-file-name-p 'tramp-smb-file-name-handler))


;; File name primitives

(defun tramp-smb-not-handled (operation &rest args)
  "Default handler for all functions which are disrecarded."
  (tramp-message 10 "Won't be handled: %s %s" operation args)
  nil)

(defun tramp-smb-handle-copy-file
  (filename newname &optional ok-if-already-exists keep-date)
  "Like `copy-file' for tramp files.
KEEP-DATE is not handled in case NEWNAME resides on an SMB server."
  (setq filename (expand-file-name filename)
        newname (expand-file-name newname))

  (let ((tmpfile (file-local-copy filename)))

    (if tmpfile
        ;; remote filename
        (rename-file tmpfile newname ok-if-already-exists)

      ;; remote newname
      (when (file-directory-p newname)
        (setq newname (expand-file-name
                       (file-name-nondirectory filename) newname)))
      (when (and (not ok-if-already-exists)
                 (file-exists-p newname))
        (error "copy-file: file %s already exists" newname))

;      (with-parsed-tramp-file-name newname nil
      (let (user host path)
        (with-parsed-tramp-file-name newname l
          (setq user l-user host l-host path l-path))
        (save-excursion
          (let ((share (tramp-smb-get-share path))
                (file (tramp-smb-get-path path t)))
            (unless share
              (error "Target `%s' must contain a share name" filename))
            (tramp-smb-maybe-open-connection user host share)
            (tramp-message-for-buffer
             nil tramp-smb-method user host
             5 "Copying file %s to file %s..." filename newname)
            (if (tramp-smb-send-command
                 user host (format "put %s \"%s\"" filename file))
                (tramp-message-for-buffer
                 nil tramp-smb-method user host
                 5 "Copying file %s to file %s...done" filename newname)
              (error "Cannot copy `%s'" filename))))))))

(defun tramp-smb-handle-delete-directory (directory)
  "Like `delete-directory' for tramp files."
  (setq directory (directory-file-name (expand-file-name directory)))
  (unless (file-exists-p directory)
    (error "Cannot delete non-existing directory `%s'" directory))
;  (with-parsed-tramp-file-name directory nil
  (let (user host path)
    (with-parsed-tramp-file-name directory l
      (setq user l-user host l-host path l-path))
    (save-excursion
      (let ((share (tramp-smb-get-share path))
            (dir (tramp-smb-get-path (file-name-directory path) t))
            (file (file-name-nondirectory path)))
        (tramp-smb-maybe-open-connection user host share)
        (if (and
             (tramp-smb-send-command user host (format "cd \"%s\"" dir))
             (tramp-smb-send-command user host (format "rmdir \"%s\"" file)))
            ;; Go Home
            (tramp-smb-send-command user host (format "cd \\"))
          ;; Error
          (tramp-smb-send-command user host (format "cd \\"))
          (error "Cannot delete directory `%s'" directory))))))

(defun tramp-smb-handle-delete-file (filename)
  "Like `delete-file' for tramp files."
  (setq filename (expand-file-name filename))
  (unless (file-exists-p filename)
    (error "Cannot delete non-existing file `%s'" filename))
;  (with-parsed-tramp-file-name filename nil
  (let (user host path)
    (with-parsed-tramp-file-name filename l
      (setq user l-user host l-host path l-path))
    (save-excursion
      (let ((share (tramp-smb-get-share path))
            (dir (tramp-smb-get-path (file-name-directory path) t))
            (file (file-name-nondirectory path)))
        (unless (file-exists-p filename)
          (error "Cannot delete non-existing file `%s'" filename))
        (tramp-smb-maybe-open-connection user host share)
        (if (and
             (tramp-smb-send-command user host (format "cd \"%s\"" dir))
             (tramp-smb-send-command user host (format "rm \"%s\"" file)))
            ;; Go Home
            (tramp-smb-send-command user host (format "cd \\"))
          ;; Error
          (tramp-smb-send-command user host (format "cd \\"))
          (error "Cannot delete file `%s'" directory))))))

(defun tramp-smb-handle-directory-files
  (directory &optional full match nosort)
  "Like `directory-files' for tramp files."
  (setq directory (directory-file-name (expand-file-name directory)))
;  (with-parsed-tramp-file-name directory nil
  (let (user host path)
    (with-parsed-tramp-file-name directory l
      (setq user l-user host l-host path l-path))
    (save-excursion
      (let* ((share (tramp-smb-get-share path))
             (file (tramp-smb-get-path path nil))
             (entries (tramp-smb-get-file-entries user host share file)))
        ;; Just the file names are needed
        (setq entries (mapcar 'car entries))
        ;; Discriminate with regexp
        (when match
          (setq entries
                (delete nil
                        (mapcar (lambda (x) (when (string-match match x) x))
                                entries))))
        ;; Make absolute paths if necessary
        (when full
          (setq entries
                (mapcar (lambda (x)
                          (concat (file-name-as-directory directory) x))
                        entries)))
        ;; Sort them if necessary
        (unless nosort (setq entries (sort entries 'string-lessp)))
        ;; That's it
        entries))))

(defun tramp-smb-handle-directory-files-and-attributes
  (directory &optional full match nosort)
  "Like `directory-files-and-attributes' for tramp files."
  (mapcar
   (lambda (x)
     (cons x (file-attributes
        (if full x (concat (file-name-as-directory directory) x)))))
   (directory-files directory full match nosort)))

(defun tramp-smb-handle-file-attributes (filename &optional nonnumeric)
  "Like `file-attributes' for tramp files.
Optional argument NONNUMERIC means return user and group name
rather than as numbers."
;  (with-parsed-tramp-file-name filename nil
  (let (user host path)
    (with-parsed-tramp-file-name filename l
      (setq user l-user host l-host path l-path))
    (save-excursion
      (let* ((share (tramp-smb-get-share path))
             (file (tramp-smb-get-path path nil))
             (entries (tramp-smb-get-file-entries user host share file))
             (entry (and entries
                         (assoc (file-name-nondirectory file) entries)))
             (inode (tramp-smb-get-inode share file))
             (device (tramp-get-device nil tramp-smb-method user host)))

        ; check result
        (when entry
          (list (and (string-match "d" (nth 1 entry))
                     t)         ;0 file type
                -1              ;1 link count
                -1              ;2 uid
                -1              ;3 gid
                '(0 0)          ;4 atime
                (nth 3 entry)   ;5 mtime
                '(0 0)          ;6 ctime
                (nth 2 entry)   ;7 size
                (nth 1 entry)   ;8 mode
                nil             ;9 gid weird
                inode           ;10 inode number
                device))))))    ;11 file system number

(defun tramp-smb-handle-file-directory-p (filename)
  "Like `file-directory-p' for tramp files."
;  (with-parsed-tramp-file-name filename nil
  (let  (user host path)
    (with-parsed-tramp-file-name filename l
      (setq user l-user host l-host path l-path))
    (save-excursion
      (let* ((share (tramp-smb-get-share path))
             (file (tramp-smb-get-path path nil))
             (entries (tramp-smb-get-file-entries user host share file))
             (entry (and entries
                         (assoc (file-name-nondirectory file) entries))))
        (and entry
             (string-match "d" (nth 1 entry))
             t)))))

(defun tramp-smb-handle-file-exists-p (filename)
  "Like `file-exists-p' for tramp files."
;  (with-parsed-tramp-file-name filename nil
  (let  (user host path)
    (with-parsed-tramp-file-name filename l
      (setq user l-user host l-host path l-path))
    (save-excursion
      (let* ((share (tramp-smb-get-share path))
             (file (tramp-smb-get-path path nil))
             (entries (tramp-smb-get-file-entries user host share file)))
        (and entries
             (member (file-name-nondirectory file) (mapcar 'car entries))
             t)))))

(defun tramp-smb-handle-file-local-copy (filename)
  "Like `file-local-copy' for tramp files."
  (with-parsed-tramp-file-name filename nil
    (save-excursion
      (let ((share (tramp-smb-get-share path))
            (file (tramp-smb-get-path path t))
            (tmpfil (tramp-make-temp-file)))
        (unless (file-exists-p filename)
          (error "Cannot make local copy of non-existing file `%s'" filename))
        (tramp-message-for-buffer
         nil tramp-smb-method user host
         5 "Fetching %s to tmp file %s..." filename tmpfil)
        (tramp-smb-maybe-open-connection user host share)
        (if (tramp-smb-send-command
             user host (format "get \"%s\" %s" file tmpfil))
            (tramp-message-for-buffer
             nil tramp-smb-method user host
             5 "Fetching %s to tmp file %s...done" filename tmpfil)
          (error "Cannot make local copy of file `%s'" filename))
        tmpfil))))

;; This function should return "foo/" for directories and "bar" for
;; files.
(defun tramp-smb-handle-file-name-all-completions (filename directory)
  "Like `file-name-all-completions' for tramp files."
;  (with-parsed-tramp-file-name directory nil
  (let (user host path)
    (with-parsed-tramp-file-name directory l
      (setq user l-user host l-host path l-path))
    (save-match-data
      (save-excursion
        (let* ((share (tramp-smb-get-share path))
               (file (tramp-smb-get-path path nil))
               (entries (tramp-smb-get-file-entries user host share file)))

          (all-completions
           filename
           (mapcar
            (lambda (x)
              (list
               (if (string-match "d" (nth 1 x))
                   (file-name-as-directory (nth 0 x))
                 (nth 0 x))))
            entries)))))))

(defun tramp-smb-handle-file-newer-than-file-p (file1 file2)
  "Like `file-newer-than-file-p' for tramp files."
  (cond
   ((not (file-exists-p file1)) nil)
   ((not (file-exists-p file2)) t)
   (t (tramp-smb-time-less-p (file-attributes file2)
                             (file-attributes file1)))))

(defun tramp-smb-handle-file-writable-p (filename)
  "Like `file-writable-p' for tramp files."
;  (with-parsed-tramp-file-name filename nil
  (let  (user host path)
    (with-parsed-tramp-file-name filename l
      (setq user l-user host l-host path l-path))
    (save-excursion
      (let* ((share (tramp-smb-get-share path))
             (file (tramp-smb-get-path path nil))
             (entries (tramp-smb-get-file-entries user host share file))
             (entry (and entries
                         (assoc (file-name-nondirectory file) entries))))
        (and entry
             (string-match "w" (nth 1 entry))
             t)))))

(defun tramp-smb-handle-insert-directory
  (filename switches &optional wildcard full-directory-p)
  "Like `insert-directory' for tramp files.
WILDCARD and FULL-DIRECTORY-P are not handled."
  (setq filename (expand-file-name filename))
  (when (file-directory-p filename)
    ;; This check is a little bit strange, but in `dired-add-entry'
    ;; this function is called with a non-directory ...
    (setq filename (file-name-as-directory filename)))
;  (with-parsed-tramp-file-name filename nil
  (let  (user host path)
    (with-parsed-tramp-file-name filename l
      (setq user l-user host l-host path l-path))
    (save-match-data
      (let* ((share (tramp-smb-get-share path))
             (file (tramp-smb-get-path path nil))
             (entries (tramp-smb-get-file-entries user host share file)))

        ;; Delete dummy "" entry, useless entries
        (setq entries
              (if (file-directory-p filename)
                  (delq (assoc "" entries) entries)
                ;; We just need the only and only entry FILENAME.
                (list (assoc (file-name-nondirectory filename) entries))))

        ;; Sort entries
        (setq entries
              (sort
               entries
               (lambda (x y)
                 (if (string-match "t" switches)
                     ; sort by date
                     (tramp-smb-time-less-p (nth 3 y) (nth 3 x))
                   ; sort by name
                   (string-lessp (nth 0 x) (nth 0 y))))))

        ;; Print entries
        (mapcar
         (lambda (x)
           (insert
            (format
             "%10s %3d %-8s %-8s %8s %s %s\n"
             (nth 1 x) ; mode
             1 "nobody" "nogroup"
             (nth 2 x) ; size
             (format-time-string
              (if (tramp-smb-time-less-p
                   (tramp-smb-time-subtract (current-time) (nth 3 x))
                   tramp-smb-half-a-year)
                  "%b %e %R"
                "%b %e  %Y")
              (nth 3 x)) ; date
             (nth 0 x))) ; file name
           (forward-line)
           (beginning-of-line))
         entries)))))

(defun tramp-smb-handle-make-directory (dir &optional parents)
  "Like `make-directory' for tramp files."
  (setq dir (directory-file-name (expand-file-name dir)))
  (unless (file-name-absolute-p dir)
    (setq dir (concat default-directory dir)))
;  (with-parsed-tramp-file-name dir nil
  (let  (user host path)
    (with-parsed-tramp-file-name dir l
      (setq user l-user host l-host path l-path))
    (save-match-data
      (let* ((share (tramp-smb-get-share path))
             (ldir (file-name-directory dir)))
        ;; Make missing directory parts
        (when (and parents share (not (file-directory-p ldir)))
          (make-directory ldir parents))
        ;; Just do it
        (when (file-directory-p ldir)
          (make-directory-internal dir))
        (unless (file-directory-p dir)
          (error "Couldn't make directory %s" dir))))))

(defun tramp-smb-handle-make-directory-internal (directory)
  "Like `make-directory-internal' for tramp files."
  (setq directory (directory-file-name (expand-file-name directory)))
  (unless (file-name-absolute-p directory)
    (setq ldir (concat default-directory directory)))
;  (with-parsed-tramp-file-name directory nil
  (let  (user host path)
    (with-parsed-tramp-file-name directory l
      (setq user l-user host l-host path l-path))
    (save-match-data
      (let* ((share (tramp-smb-get-share path))
             (file (tramp-smb-get-path path nil)))
        (when (file-directory-p (file-name-directory directory))
          (tramp-smb-maybe-open-connection user host share)
          (tramp-smb-send-command user host (format "mkdir \"%s\"" file)))
        (unless (file-directory-p directory)
          (error "Couldn't make directory %s" directory))))))

(defun tramp-smb-handle-rename-file
  (filename newname &optional ok-if-already-exists)
  "Like `rename-file' for tramp files."
  (setq filename (expand-file-name filename)
        newname (expand-file-name newname))

  (let ((tmpfile (file-local-copy filename)))

    (if tmpfile
        ;; remote filename
        (rename-file tmpfile newname ok-if-already-exists)

      ;; remote newname
      (when (file-directory-p newname)
        (setq newname (expand-file-name
                      (file-name-nondirectory filename) newname)))
      (when (and (not ok-if-already-exists)
                 (file-exists-p newname))
          (error "rename-file: file %s already exists" newname))

;      (with-parsed-tramp-file-name newname nil
      (let (user host path)
        (with-parsed-tramp-file-name newname l
          (setq user l-user host l-host path l-path))
        (save-excursion
          (let ((share (tramp-smb-get-share path))
                (file (tramp-smb-get-path path t)))
            (tramp-smb-maybe-open-connection user host share)
            (tramp-message-for-buffer
             nil tramp-smb-method user host
             5 "Copying file %s to file %s..." filename newname)
            (if (tramp-smb-send-command
                 user host (format "put %s \"%s\"" filename file))
                (tramp-message-for-buffer
                 nil tramp-smb-method user host
                 5 "Copying file %s to file %s...done" filename newname)
              (error "Cannot rename `%s'" filename)))))))

  (delete-file filename))

(defun tramp-smb-handle-write-region
  (start end filename &optional append visit lockname confirm)
  "Like `write-region' for tramp files."
  (unless (eq append nil)
    (error "Cannot append to file using tramp (`%s')" filename))
  (setq filename (expand-file-name filename))
  ;; XEmacs takes a coding system as the seventh argument, not `confirm'
  (when (and (not (featurep 'xemacs))
             confirm (file-exists-p filename))
    (unless (y-or-n-p (format "File %s exists; overwrite anyway? "
                              filename))
      (error "File not overwritten")))
;  (with-parsed-tramp-file-name filename nil
  (let (user host path)
    (with-parsed-tramp-file-name filename l
      (setq user l-user host l-host path l-path))
    (save-excursion
      (let ((share (tramp-smb-get-share path))
            (file (tramp-smb-get-path path t))
            (curbuf (current-buffer))
            ;; We use this to save the value of `last-coding-system-used'
            ;; after writing the tmp file.  At the end of the function,
            ;; we set `last-coding-system-used' to this saved value.
            ;; This way, any intermediary coding systems used while
            ;; talking to the remote shell or suchlike won't hose this
            ;; variable.  This approach was snarfed from ange-ftp.el.
            coding-system-used
            tmpfil)
        ;; Write region into a tmp file.
        (setq tmpfil (tramp-make-temp-file))
        ;; We say `no-message' here because we don't want the visited file
        ;; modtime data to be clobbered from the temp file.  We call
        ;; `set-visited-file-modtime' ourselves later on.
        (tramp-run-real-handler
         'write-region
         (if confirm ; don't pass this arg unless defined for backward compat.
             (list start end tmpfil append 'no-message lockname confirm)
           (list start end tmpfil append 'no-message lockname)))
        ;; Now, `last-coding-system-used' has the right value.  Remember it.
        (when (boundp 'last-coding-system-used)
          (setq coding-system-used last-coding-system-used))

        (tramp-smb-maybe-open-connection user host share)
        (tramp-message-for-buffer
         nil tramp-smb-method user host
         5 "Writing tmp file %s to file %s..." tmpfil filename)
        (if (tramp-smb-send-command
             user host (format "put %s \"%s\"" tmpfil file))
            (tramp-message-for-buffer
             nil tramp-smb-method user host
             5 "Writing tmp file %s to file %s...done" tmpfil filename)
          (error "Cannot write `%s'" filename))

        (delete-file tmpfil)
        (unless (equal curbuf (current-buffer))
          (error "Buffer has changed from `%s' to `%s'"
                 curbuf (current-buffer)))
        (when (eq visit t)
          (set-visited-file-modtime))
        ;; Make `last-coding-system-used' have the right value.
        (when (boundp 'last-coding-system-used)
          (setq last-coding-system-used coding-system-used))))))


;; Internal file name functions

(defun tramp-smb-get-share (path)
  "Returns the share name of PATH."
  (save-match-data
    (when (string-match "^/?\\([^/]+\\)/" path)
      (match-string 1 path))))

(defun tramp-smb-get-path (path convert)
  "Returns the file name of PATH.
If CONVERT is non-nil exchange \"/\" by \"\\\\\"."
  (save-match-data
    (let ((res path))

      (setq
       res (if (string-match "^/?[^/]+/\\(.*\\)" res)
               (if convert
                   (mapconcat
                    (lambda (x) (if (equal x ?/) "\\" (char-to-string x)))
                    (match-string 1 res) "")
                 (match-string 1 res))
             (if (string-match "^/?\\([^/]+\\)$" res)
                 (match-string 1 res)
               "")))

      ;; Sometimes we have discarded `substitute-in-file-name'
      (when (string-match "\\(\\$\\$\\)\\(/\\|$\\)" res)
        (setq res (replace-match "$" nil nil res 1)))

      res)))

;; Share names of a host are cached. It is very unlikely that the
;; shares do change during connection.
(defun tramp-smb-get-file-entries (user host share path)
  "Read entries which match PATH.
Either the shares are listed, or the `dir' command is executed.
Only entries matching the path are returned.
Result is a list of (PATH MODE SIZE MONTH DAY TIME YEAR)."
  (save-excursion
    (save-match-data
      (let ((base (or (and (> (length path) 0)
                           (string-match "\\([^/]+\\)$" path)
                           (regexp-quote (match-string 1 path)))
                      ""))
            res entry)
        (set-buffer (tramp-get-buffer nil tramp-smb-method user host))
        (if (and (not share) tramp-smb-share-cache)
            ;; Return cached shares
            (setq res tramp-smb-share-cache)
          ;; Read entries
          (tramp-smb-maybe-open-connection user host share)
          (when share
            (tramp-smb-send-command
             user host
             (format "dir %s"
                     (if (zerop (length path)) "" (concat "\"" path "*\"")))))
          (goto-char (point-min))
          ;; Loop the listing
          (unless (re-search-forward tramp-smb-errors nil t)
            (while (not (eobp))
              (setq entry (tramp-smb-read-file-entry share))
              (forward-line)
              (when entry (add-to-list 'res entry))))
          (unless share
            ;; Cache share entries
            (setq tramp-smb-share-cache res)))


        ;; Add directory itself
        (add-to-list 'res '("" "dr-xr-xr-x" 0 (0 0)))

        ;; Check for matching entries
        (delq nil (mapcar
                   (lambda (x) (and (string-match base (nth 0 x)) x))
                   res))))))

;; Return either a share name (if SHARE is nil), or a file name
;;
;; If shares are listed, the following format is expected
;;
;; \s-\{8,8}                              - leading spaces
;; \S-\(.*\S-\)\s-*                       - share name, 14 char
;; \s-                                    - space delimeter
;; \S-+\s-*                               - type, 8 char, "Disk    " expected
;; \(\s-\{2,2\}.*\)?                      - space delimeter, comment
;;
;; Entries provided by smbclient DIR aren't fully regular.
;; They should have the format
;;
;; \s-\{2,2}                              - leading spaces
;; \S-\(.*\S-\)\s-*                       - file name, 32 chars, left bound
;; \s-                                    - space delimeter
;; \s-*[ADHRS]*                           - permissions, 5 chars, right bound
;; \s-                                    - space delimeter
;; \s-*[0-9]+                             - size, 8 (Samba) or 7 (Windows)
;;                                          chars, right bound
;; \s-\{2,2\}                             - space delimeter
;; \w\{3,3\}                              - weekday
;; \s-                                    - space delimeter
;; [ 19][0-9]                             - day
;; \s-                                    - space delimeter
;; [0-9]\{2,2\}:[0-9]\{2,2\}:[0-9]\{2,2\} - time
;; \s-                                    - space delimeter
;; [0-9]\{4,4\}                           - year
;;
;; Problems:
;; * Modern regexp constructs, like spy groups and counted repetitions, aren't
;;   available in older Emacsen.
;; * The length of constructs (file name, size) might exceed the default.
;; * File names might contain spaces.
;; * Permissions might be empty.
;;
;; So we try to analyze backwards.
(defun tramp-smb-read-file-entry (share)
  "Parse entry in SMB output buffer.
If SHARE is result, entries are of type dir. Otherwise, shares are listed.
Result is the list (PATH MODE SIZE MTIME)."
  (let ((line (buffer-substring (point) (tramp-point-at-eol)))
        path mode size month day hour min sec year mtime)

    (if (not share)

        ; Read share entries
        (when (string-match "^\\s-+\\(\\S-+\\)\\s-+Disk" line)
          (setq path (match-string 1 line)
                mode "dr-xr-xr-x"
                size 0))

      ; Real listing
      (block nil

        ;; year
        (if (string-match "\\([0-9]+\\)$" line)
            (setq year (string-to-number (match-string 1 line))
                  line (substring line 0 -5))
          (return))

        ;; time
        (if (string-match "\\([0-9]+\\):\\([0-9]+\\):\\([0-9]+\\)$" line)
            (setq hour (string-to-number (match-string 1 line))
                  min  (string-to-number (match-string 2 line))
                  sec  (string-to-number (match-string 3 line))
                  line (substring line 0 -9))
          (return))

        ;; day
        (if (string-match "\\([0-9]+\\)$" line)
            (setq day  (string-to-number (match-string 1 line))
                  line (substring line 0 -3))
          (return))

        ;; month
        (if (string-match "\\(\\w+\\)$" line)
            (setq month (match-string 1 line)
                  line  (substring line 0 -4))
          (return))

        ;; weekday
        (if (string-match "\\(\\w+\\)$" line)
            (setq line (substring line 0 -5))
          (return))

        ;; size
        (if (string-match "\\([0-9]+\\)$" line)
            (setq
             size (string-to-number (match-string 1 line))
             line (substring
                   line 0 (- (max 8 (1+ (length (match-string 1 line)))))))
          (return))

        ;; mode
        (if (string-match "\\(\\([ADHRS]+\\)?\\s-?\\)$" line)
            (setq
             mode (or (match-string 2 line) "")
             mode (save-match-data (format
                    "%s%s"
                    (if (string-match "D" mode) "d" "-")
                    (mapconcat
                     (lambda (x) "") "    "
                     (concat "r" (if (string-match "R" mode) "-" "w") "x"))))
             line (substring line 0 (- (1+ (length (match-string 2 line))))))
          (return))

        ;; path
        (if (string-match "^\\s-+\\(\\S-\\(.*\\S-\\)?\\)\\s-+$" line)
            (setq path (match-string 1 line))
          (return))))

    (when (and path mode size)
      (setq mtime
            (if (and sec min hour day month year)
                (encode-time
                 sec min hour day
                 (cdr (assoc (downcase month) tramp-smb-parse-time-months))
                 year)
              '(0 0)))
      (list path mode size mtime))))

;; Inodes don't exist for SMB files.  Therefore we must generate virtual ones.
;; Used in `find-buffer-visiting'.
;; The method applied might be not so efficient (Ange-FTP uses hashes). But
;; performance isn't the major issue given that file transfer will take time.

(defun tramp-smb-get-inode (share file)
  "Returns the virtual inode number.
If it doesn't exist, generate a new one."
  (let ((string (concat share "/" (directory-file-name file))))
    (unless (assoc string tramp-smb-inodes)
      (add-to-list 'tramp-smb-inodes
                   (list string (length tramp-smb-inodes))))
    (nth 1 (assoc string tramp-smb-inodes))))


;; Connection functions

(defun tramp-smb-send-command (user host command)
  "Send the COMMAND to USER at HOST (logged into an SMB session).
Erases temporary buffer before sending the command.  Returns nil if
there has been an error message from smbclient."
  (save-excursion
    (set-buffer (tramp-get-buffer nil tramp-smb-method user host))
    (erase-buffer)
    (tramp-send-command nil tramp-smb-method user host command nil t)
    (tramp-smb-wait-for-output user host)))

(defun tramp-smb-maybe-open-connection (user host share)
  "Maybe open a connection to HOST, logging in as USER, using `tramp-smb-program'.
Does not do anything if a connection is already open, but re-opens the
connection if a previous connection has died for some reason."
  (let ((p (get-buffer-process
            (tramp-get-buffer nil tramp-smb-method user host))))
    (save-excursion
      (set-buffer (tramp-get-buffer nil tramp-smb-method user host))
      ;; Check whether it is still the same share
      (unless (and p (processp p) (string-equal tramp-smb-share share))
        (when (and p (processp p))
          (delete-process p)
          (setq p nil)))
      ;; If too much time has passed since last command was sent, look
      ;; whether process is still alive.  If it isn't, kill it.
      (when (and tramp-last-cmd-time
                 (> (tramp-time-diff (current-time) tramp-last-cmd-time) 60)
                 p (processp p) (memq (process-status p) '(run open)))
        (unless (and p (processp p) (memq (process-status p) '(run open)))
          (delete-process p)
          (setq p nil))))
    (unless (and p (processp p) (memq (process-status p) '(run open)))
      (when (and p (processp p))
        (delete-process p))
      (tramp-smb-open-connection user host share))))

(defun tramp-smb-open-connection (user host share)
  "Open a connection using `tramp-smb-program'.
This starts the command `smbclient //HOST/SHARE -U USER', then waits
for a remote password prompt.  It queries the user for the password,
then sends the password to the remote host.

Domain names in USER and port numbers in HOST are acknowledged."

  (save-match-data
    (let* ((buffer (tramp-get-buffer nil tramp-smb-method user host))
           (real-user user)
           (real-host host)
           domain port args)

      ; Check for domain ("user%domain") and port ("host#port")
      (when (and user (string-match "\\(.+\\)%\\(.+\\)" user))
        (setq real-user (or (match-string 1 user) user)
              domain (match-string 2 user)))

      (when (and host (string-match "\\(.+\\)#\\(.+\\)" host))
        (setq real-host (or (match-string 1 host) host)
              port (match-string 2 host)))

      (if share
          (setq args (list (concat "//" real-host "/" share)))
        (setq args (list "-L" real-host )))

      (if real-user
          (setq args (append args (list "-U" real-user)))
        (setq args (append args (list "-N"))))

      (when domain (setq args (append args (list "-W" domain))))
      (when port   (setq args (append args (list "-p" port))))

      ; OK, let's go
      (tramp-pre-connection nil tramp-smb-method user host)
      (tramp-message 7 "Opening connection for //%s@%s/%s..."
                     user host (or share ""))

      (let* ((default-directory (tramp-temporary-file-directory))
             ;; If we omit the conditional here, then we would use
             ;; `undecided-dos' in some cases.  With the conditional,
             ;; we use nil in these cases.  Which one is right?
             (coding-system-for-read (unless (and (not (featurep 'xemacs))
                                                  (> emacs-major-version 20))
                                       tramp-dos-coding-system))
             (p (apply #'start-process (buffer-name buffer) buffer
                       tramp-smb-program args)))

        (tramp-message 9 "Started process %s" (process-command p))
        (process-kill-without-query p)
        (set-buffer buffer)
        (set-process-sentinel
         p (lambda (proc str) (setq tramp-smb-process-running nil)))
        ; If no share is given, the process will terminate
        (setq tramp-smb-process-running share
              tramp-smb-share share)

        ; send password
        (when real-user
          (let ((pw-prompt "Password:"))
            (tramp-message 9 "Sending password")
            (tramp-enter-password p pw-prompt)))

        (unless (tramp-smb-wait-for-output user host)
          (error "Cannot open connection //%s@%s/%s"
                 user host (or share "")))))))

;; We don't use timeouts.  If needed, the caller shall wrap around.
(defun tramp-smb-wait-for-output (user host)
  "Wait for output from smbclient command.
Sets position to begin of buffer.
Returns nil if an error message has appeared."
  (save-excursion
    (let ((proc (get-buffer-process (current-buffer)))
          (found (progn (goto-char (point-max))
                        (beginning-of-line)
                        (looking-at tramp-smb-prompt)))
          err)
      (save-match-data
        ;; Algorithm: get waiting output.  See if last line contains
        ;; tramp-smb-prompt sentinel, or process has exited.
        ;; If not, wait a bit and again get waiting output.
        (while (and (not found) tramp-smb-process-running)
          (accept-process-output proc)
          (goto-char (point-max))
          (beginning-of-line)
          (setq found (looking-at tramp-smb-prompt)))

        ;; There might be pending output.  If tramp-smb-prompt sentinel
        ;; hasn't been found, the process has died already.  We should
        ;; give it a chance.
        (when (not found) (accept-process-output nil 1))

        ;; Search for errors.
        (goto-char (point-min))
        (setq err (re-search-forward tramp-smb-errors nil t)))

      ;; Add output to debug buffer if appropriate.
      (when tramp-debug-buffer
        (append-to-buffer
         (tramp-get-debug-buffer nil tramp-smb-method user host)
         (point-min) (point-max))
        (when (and (not found) tramp-smb-process-running)
          (save-excursion
            (set-buffer
             (tramp-get-debug-buffer nil tramp-smb-method user host))
            (goto-char (point-max))
            (insert (format "[[Remote prompt `%s' not found]]\n"
                            tramp-smb-prompt)))))
      (goto-char (point-min))
      ;; Return value is whether no error message has appeared.
      (not err))))


;; Snarfed code from time-date.el and parse-time.el

(defconst tramp-smb-half-a-year '(241 17024)
"Evaluated by \"(days-to-time 183)\".")

(defconst tramp-smb-parse-time-months '(("jan" . 1) ("feb" . 2) ("mar" . 3)
                            ("apr" . 4) ("may" . 5) ("jun" . 6)
                            ("jul" . 7) ("aug" . 8) ("sep" . 9)
                            ("oct" . 10) ("nov" . 11) ("dec" . 12))
"Alist mapping month names to integers.")

(defun tramp-smb-time-less-p (t1 t2)
  "Say whether time value T1 is less than time value T2."
  (unless t1 (setq t1 '(0 0)))
  (unless t2 (setq t2 '(0 0)))
  (or (< (car t1) (car t2))
      (and (= (car t1) (car t2))
           (< (nth 1 t1) (nth 1 t2)))))

(defun tramp-smb-time-subtract (t1 t2)
  "Subtract two time values.
Return the difference in the format of a time value."
  (unless t1 (setq t1 '(0 0)))
  (unless t2 (setq t2 '(0 0)))
  (let ((borrow (< (cadr t1) (cadr t2))))
    (list (- (car t1) (car t2) (if borrow 1 0))
          (- (+ (if borrow 65536 0) (cadr t1)) (cadr t2)))))


;; `PC-do-completion' touches the returning "$$" by `substitute-in-file-name'.
;; Must be corrected.

(defadvice PC-do-completion (around tramp-smb-advice-PC-do-completion activate)
  "Changes \"$\" back to \"$$\" in minibuffer."
  (if (funcall PC-completion-as-file-name-predicate)

      (progn
        ;; Substitute file names
        (let* ((beg (or (and (functionp 'minibuffer-prompt-end) ; Emacs 21
                             (funcall 'minibuffer-prompt-end))
                        (point-min)))
               (end (point-max))
               (str (substitute-in-file-name (buffer-substring beg end))))
          (delete-region beg end)
          (insert str)
          (ad-set-arg 2 (point)))

        ;; Do `PC-do-completion' without substitution
        (let* (save)
          (fset 'save (symbol-function 'substitute-in-file-name))
          (fset 'substitute-in-file-name (symbol-function 'identity))
          ad-do-it
          (fset 'substitute-in-file-name (symbol-function 'save)))

        ;; Expand "$"
        (let* ((beg (or (and (functionp 'minibuffer-prompt-end) ; Emacs 21
                             (funcall 'minibuffer-prompt-end))
                        (point-min)))
               (end (point-max))
               (str (buffer-substring beg end)))
          (delete-region beg end)
          (insert (if (string-match "\\(\\$\\)\\(/\\|$\\)" str)
                      (replace-match "$$" nil nil str 1)
                    str))))

    ;; No file names. Behave unchanged.
    ad-do-it))

(provide 'tramp-smb)

;;; TODO:

;; * Provide a local smb.conf. The default one might not be readable.
;; * Error handling in case password is wrong.
;; * Read password from "~/.netrc".
;; * Use different buffers for different shares.  By this, the password
;;   won't be requested again when changing shares on the same host.
;; * Return more comprehensive file permission string.  Think whether it is
;;   possible to implement `set-file-modes'.
;; * Handle WILDCARD and FULL-DIRECTORY-P in
;;   `tramp-smb-handle-insert-directory'.
;; * Handle links (FILENAME.LNK).
;; * Maybe local tmp files should have the same extension like the original
;;   files.  Strange behaviour with jka-compr otherwise?
;; * Copy files in dired from SMB to another method doesn't work.
;; * Try to remove the inclusion of dummy "" directory.  Seems to be at
;;   several places, especially in `tramp-smb-handle-insert-directory'.
;; * Provide variables for debug.
;; * (RMS) Use unwind-protect to clean up the state so as to make the state
;;   regular again.

;;; tramp-smb.el ends here