Introduce a defstruct `tramp-file-name' as central data structure.

This solves also Bug#27009.

* lisp/net/tramp.el (tramp-current-domain)
(tramp-current-port): New defvars.
(tramp-file-name): New defstruct.
(tramp-file-name-user-domain, tramp-file-name-host-port)
(tramp-file-name-equal-p): New defuns.
(tramp-file-name-p, tramp-file-name-method)
(tramp-file-name-user, tramp-file-name-host)
(tramp-file-name-localname, tramp-file-name-hop)
(tramp-file-name-real-user, tramp-file-name-domain)
(tramp-file-name-real-host, tramp-file-name-port):
Remove defuns.  They are provided by the defstruct, or not
needed anymore.
(tramp-dissect-file-name, tramp-buffer-name)
(tramp-make-tramp-file-name, tramp-get-buffer)
(tramp-set-connection-local-variables)
(tramp-debug-buffer-name, tramp-message)
(tramp-error-with-buffer, with-parsed-tramp-file-name)
(tramp-completion-dissect-file-name1)
(tramp-handle-file-name-as-directory)
(tramp-handle-file-name-directory)
(tramp-handle-file-remote-p, tramp-handle-file-symlink-p)
(tramp-handle-find-backup-file-name)
(tramp-handle-insert-file-contents, tramp-process-actions)
(tramp-check-cached-permissions, tramp-local-host-p)
(tramp-get-remote-tmpdir, tramp-call-process)
(tramp-call-process-region, tramp-read-passwd)
(tramp-clear-passwd):
* lisp/net/tramp-adb.el (tramp-adb-parse-device-names)
(tramp-adb-handle-expand-file-name)
(tramp-adb-handle-file-truename, tramp-adb-handle-copy-file)
(tramp-adb-handle-process-file)
(tramp-adb-maybe-open-connection):
* lisp/net/tramp-cache.el (tramp-get-hash-table)
(tramp-get-file-property, tramp-set-file-property)
(tramp-flush-file-property, tramp-flush-directory-property)
(tramp-get-connection-property)
(tramp-set-connection-property, tramp-connection-property-p)
(tramp-flush-connection-property, tramp-cache-print)
(tramp-list-connections, tramp-dump-connection-properties)
(tramp-parse-connection-properties):
* lisp/net/tramp-cmds.el (tramp-cleanup-connection):
* lisp/net/tramp-ftp.el (tramp-ftp-file-name-handler):
* lisp/net/tramp-gvfs.el (tramp-gvfs-handle-expand-file-name)
(tramp-gvfs-url-file-name, tramp-gvfs-handler-askpassword)
(tramp-gvfs-handler-mounted-unmounted)
(tramp-gvfs-mount-spec, tramp-gvfs-get-remote-uid)
(tramp-gvfs-get-remote-gid)
(tramp-gvfs-maybe-open-connection):
* lisp/net/tramp-sh.el (tramp-sh-handle-file-truename)
(tramp-do-copy-or-rename-file-out-of-band)
(tramp-sh-handle-expand-file-name)
(tramp-sh-handle-start-file-process)
(tramp-sh-handle-process-file, tramp-compute-multi-hops)
(tramp-maybe-open-connection)
(tramp-make-copy-program-file-name, tramp-get-remote-path)
(tramp-get-inline-coding):
* lisp/net/tramp-smb.el (tramp-smb-handle-copy-directory)
(tramp-smb-handle-expand-file-name)
(tramp-smb-handle-file-acl, tramp-smb-handle-process-file)
(tramp-smb-handle-set-file-acl)
(tramp-smb-maybe-open-connection): Adapt according to defstruct.

lisp/net/tramp-adb.el

@@ -199,8 +199,9 @@ pass to the OPERATION."
       ;; That's why we use `start-process'.
       (let ((p (start-process
 		tramp-adb-program (current-buffer) tramp-adb-program "devices"))
-	    (v (vector tramp-adb-method tramp-current-user
+	    (v (tramp-make-tramp-file-name
-		       tramp-current-host nil nil))
+		tramp-adb-method tramp-current-user nil
+		tramp-current-host nil nil nil))
 	    result)
 	(tramp-message v 6 "%s" (mapconcat 'identity (process-command p) " "))
 	(process-put p 'adjust-window-size-function 'ignore)
@@ -242,7 +243,7 @@ pass to the OPERATION."
       ;; be problems with UNC shares or Cygwin mounts.
       (let ((default-directory (tramp-compat-temporary-file-directory)))
 	(tramp-make-tramp-file-name
-	 method user host
+	 method user domain host port
 	 (tramp-drop-volume-letter
 	  (tramp-run-real-handler
 	   'expand-file-name (list localname))))))))
@@ -261,7 +262,7 @@ pass to the OPERATION."
    "%s%s"
    (with-parsed-tramp-file-name (expand-file-name filename) nil
      (tramp-make-tramp-file-name
-      method user host
+      method user domain host port
       (with-tramp-file-property v localname "file-truename"
 	(let ((result nil))			; result steps in reverse order
 	  (tramp-message v 4 "Finding true name for `%s'" filename)
@@ -289,7 +290,7 @@ pass to the OPERATION."
 		    (tramp-compat-file-attribute-type
 		     (file-attributes
 		      (tramp-make-tramp-file-name
-		       method user host
+		       method user domain host port
 		       (mapconcat 'identity
 				  (append '("")
 					  (reverse result)
@@ -687,7 +688,7 @@ PRESERVE-UID-GID and PRESERVE-EXTENDED-ATTRIBUTES are completely ignored."
 	newname (expand-file-name newname))
 
   (if (file-directory-p filename)
-      (tramp-file-name-handler 'copy-directory filename newname keep-date t)
+      (copy-directory filename newname keep-date t)
 
     (let ((t1 (tramp-tramp-file-p filename))
 	  (t2 (tramp-tramp-file-p newname)))
@@ -815,7 +816,8 @@ PRESERVE-UID-GID and PRESERVE-EXTENDED-ATTRIBUTES are completely ignored."
 	    (setq input (with-parsed-tramp-file-name infile nil localname))
 	  ;; INFILE must be copied to remote host.
 	  (setq input (tramp-make-tramp-temp-file v)
-		tmpinput (tramp-make-tramp-file-name method user host input))
+		tmpinput (tramp-make-tramp-file-name
+			  method user domain host port input))
 	  (copy-file infile tmpinput t)))
       (when input (setq command (format "%s <%s" command input)))
 
@@ -849,7 +851,7 @@ PRESERVE-UID-GID and PRESERVE-EXTENDED-ATTRIBUTES are completely ignored."
 	    ;; file must be deleted after execution.
 	    (setq stderr (tramp-make-tramp-temp-file v)
 		  tmpstderr (tramp-make-tramp-file-name
-			     method user host stderr))))
+			     method user domain host port stderr))))
 	 ;; stderr to be discarded.
 	 ((null (cadr destination))
 	  (setq stderr "/dev/null"))))
@@ -1199,8 +1201,7 @@ connection if a previous connection has died for some reason."
          (device (tramp-adb-get-device vec)))
 
     ;; Set variables for proper tracing in `tramp-adb-parse-device-names'.
-    (setq tramp-current-method (tramp-file-name-method vec)
+    (setq tramp-current-user   (tramp-file-name-user vec)
-	  tramp-current-user   (tramp-file-name-user vec)
 	  tramp-current-host   (tramp-file-name-host vec))
 
     ;; Maybe we know already that "su" is not supported.  We cannot

lisp/net/tramp-cache.el

@@ -27,9 +27,9 @@
 
 ;; An implementation of information caching for remote files.
 
-;; Each connection, identified by a vector [method user host
+;; Each connection, identified by a `tramp-file-name' structure or by
-;; localname] or by a process, has a unique cache. We distinguish 3
+;; a process, has a unique cache. We distinguish 3 kind of caches,
-;; kind of caches, depending on the key:
+;; depending on the key:
 ;;
 ;; - localname is NIL.  This are reusable properties.  Examples:
 ;;   "remote-shell" identifies the POSIX shell to be called on the
@@ -94,12 +94,14 @@ matching entries of `tramp-connection-properties'."
   (or (gethash key tramp-cache-data)
       (let ((hash
 	     (puthash key (make-hash-table :test 'equal) tramp-cache-data)))
-	(when (vectorp key)
+	(when (tramp-file-name-p key)
 	  (dolist (elt tramp-connection-properties)
 	    (when (string-match
 		   (or (nth 0 elt) "")
 		   (tramp-make-tramp-file-name
-		    (aref key 0) (aref key 1) (aref key 2) nil))
+		    (tramp-file-name-method key) (tramp-file-name-user key)
+		    (tramp-file-name-domain key) (tramp-file-name-host key)
+		    (tramp-file-name-port key) nil))
 	      (tramp-set-connection-property key (nth 1 elt) (nth 2 elt)))))
 	hash)))
 
@@ -107,11 +109,12 @@ matching entries of `tramp-connection-properties'."
 (defun tramp-get-file-property (key file property default)
   "Get the PROPERTY of FILE from the cache context of KEY.
 Returns DEFAULT if not set."
-  ;; Unify localname.  Remove hop from vector.
+  ;; Unify localname.  Remove hop from `tramp-file-name' structure.
-  (setq file (tramp-compat-file-name-unquote file))
+  (setq file (tramp-compat-file-name-unquote file)
-  (setq key (copy-sequence key))
+	key (copy-tramp-file-name key))
-  (aset key 3 (tramp-run-real-handler 'directory-file-name (list file)))
+  (setf (tramp-file-name-localname key)
-  (aset key 4 nil)
+	(tramp-run-real-handler 'directory-file-name (list file))
+	(tramp-file-name-hop key) nil)
   (let* ((hash (tramp-get-hash-table key))
 	 (value (when (hash-table-p hash) (gethash property hash))))
     (if
@@ -141,11 +144,12 @@ Returns DEFAULT if not set."
 (defun tramp-set-file-property (key file property value)
   "Set the PROPERTY of FILE to VALUE, in the cache context of KEY.
 Returns VALUE."
-  ;; Unify localname.  Remove hop from vector.
+  ;; Unify localname.  Remove hop from `tramp-file-name' structure.
-  (setq file (tramp-compat-file-name-unquote file))
+  (setq file (tramp-compat-file-name-unquote file)
-  (setq key (copy-sequence key))
+	key (copy-tramp-file-name key))
-  (aset key 3 (tramp-run-real-handler 'directory-file-name (list file)))
+  (setf (tramp-file-name-localname key)
-  (aset key 4 nil)
+	(tramp-run-real-handler 'directory-file-name (list file))
+	(tramp-file-name-hop key) nil)
   (let ((hash (tramp-get-hash-table key)))
     ;; We put the timestamp there.
     (puthash property (cons (current-time) value) hash)
@@ -162,11 +166,11 @@ Returns VALUE."
   (let* ((file (tramp-run-real-handler
 		'directory-file-name (list file)))
 	 (truename (tramp-get-file-property key file "file-truename" nil)))
-    ;; Unify localname.  Remove hop from vector.
+    ;; Unify localname.  Remove hop from `tramp-file-name' structure.
-    (setq file (tramp-compat-file-name-unquote file))
+    (setq file (tramp-compat-file-name-unquote file)
-    (setq key (copy-sequence key))
+	  key (copy-tramp-file-name key))
-    (aset key 3 file)
+    (setf (tramp-file-name-localname key) file
-    (aset key 4 nil)
+	  (tramp-file-name-hop key) nil)
     (tramp-message key 8 "%s" file)
     (remhash key tramp-cache-data)
     ;; Remove file properties of symlinks.
@@ -185,7 +189,8 @@ Remove also properties of all files in subdirectories."
     (tramp-message key 8 "%s" directory)
     (maphash
      (lambda (key _value)
-       (when (and (stringp (tramp-file-name-localname key))
+       (when (and (tramp-file-name-p key)
+		  (stringp (tramp-file-name-localname key))
 		  (string-match (regexp-quote directory)
 				(tramp-file-name-localname key)))
 	 (remhash key tramp-cache-data)))
@@ -232,15 +237,15 @@ This is suppressed for temporary buffers."
 (defun tramp-get-connection-property (key property default)
   "Get the named PROPERTY for the connection.
 KEY identifies the connection, it is either a process or a
-vector.  A special case is nil, which is used to cache connection
+`tramp-file-name' structure.  A special case is nil, which is
-properties of the local machine.  If the value is not set for the
+used to cache connection properties of the local machine.  If the
-connection, returns DEFAULT."
+value is not set for the connection, returns DEFAULT."
-  ;; Unify key by removing localname and hop from vector.  Work with a
+  ;; Unify key by removing localname and hop from `tramp-file-name'
-  ;; copy in order to avoid side effects.
+  ;; structure.  Work with a copy in order to avoid side effects.
-  (when (vectorp key)
+  (when (tramp-file-name-p key)
-    (setq key (copy-sequence key))
+    (setq key (copy-tramp-file-name key))
-    (aset key 3 nil)
+    (setf (tramp-file-name-localname key) nil
-    (aset key 4 nil))
+	  (tramp-file-name-hop key) nil))
   (let* ((hash (tramp-get-hash-table key))
 	 (value
 	  ;; If the key is an auxiliary process object, check whether
@@ -257,15 +262,15 @@ connection, returns DEFAULT."
 (defun tramp-set-connection-property (key property value)
   "Set the named PROPERTY of a connection to VALUE.
 KEY identifies the connection, it is either a process or a
-vector.  A special case is nil, which is used to cache connection
+`tramp-file-name' structure.  A special case is nil, which is
-properties of the local machine.  PROPERTY is set persistent when
+used to cache connection properties of the local machine.
-KEY is a vector."
+PROPERTY is set persistent when KEY is a `tramp-file-name' structure."
-  ;; Unify key by removing localname and hop from vector.  Work with a
+  ;; Unify key by removing localname and hop from `tramp-file-name'
-  ;; copy in order to avoid side effects.
+  ;; structure.  Work with a copy in order to avoid side effects.
-  (when (vectorp key)
+  (when (tramp-file-name-p key)
-    (setq key (copy-sequence key))
+    (setq key (copy-tramp-file-name key))
-    (aset key 3 nil)
+    (setf (tramp-file-name-localname key) nil
-    (aset key 4 nil))
+	  (tramp-file-name-hop key) nil))
   (let ((hash (tramp-get-hash-table key)))
     (puthash property value hash)
     (setq tramp-cache-data-changed t)
@@ -276,22 +281,22 @@ KEY is a vector."
 (defun tramp-connection-property-p (key property)
   "Check whether named PROPERTY of a connection is defined.
 KEY identifies the connection, it is either a process or a
-vector.  A special case is nil, which is used to cache connection
+`tramp-file-name' structure.  A special case is nil, which is
-properties of the local machine."
+used to cache connection properties of the local machine."
   (not (eq (tramp-get-connection-property key property 'undef) 'undef)))
 
 ;;;###tramp-autoload
 (defun tramp-flush-connection-property (key)
   "Remove all properties identified by KEY.
 KEY identifies the connection, it is either a process or a
-vector.  A special case is nil, which is used to cache connection
+`tramp-file-name' structure.  A special case is nil, which is
-properties of the local machine."
+used to cache connection properties of the local machine."
-  ;; Unify key by removing localname and hop from vector.  Work with a
+  ;; Unify key by removing localname and hop from `tramp-file-name'
-  ;; copy in order to avoid side effects.
+  ;; structure.  Work with a copy in order to avoid side effects.
-  (when (vectorp key)
+  (when (tramp-file-name-p key)
-    (setq key (copy-sequence key))
+    (setq key (copy-tramp-file-name key))
-    (aset key 3 nil)
+    (setf (tramp-file-name-localname key) nil
-    (aset key 4 nil))
+	  (tramp-file-name-hop key) nil))
   (tramp-message
    key 7 "%s %s" key
    (let ((hash (gethash key tramp-cache-data))
@@ -310,7 +315,16 @@ properties of the local machine."
       (maphash
        (lambda (key value)
 	 ;; Remove text properties from KEY and VALUE.
-	 (when (vectorp key)
+	 ;; `cl-struct-slot-*' functions exist since Emacs 25 only; we
+	 ;; ignore errors.
+	 (when (tramp-file-name-p key)
+	   ;; (dolist
+	   ;;     (slot
+	   ;; 	(mapcar 'car (cdr (cl-struct-slot-info 'tramp-file-name))))
+	   ;;   (when (stringp (cl-struct-slot-value 'tramp-file-name slot key))
+	   ;;     (setf (cl-struct-slot-value 'tramp-file-name slot key)
+	   ;; 	     (substring-no-properties
+	   ;; 	      (cl-struct-slot-value 'tramp-file-name slot key))))))
 	   (dotimes (i (length key))
 	     (when (stringp (aref key i))
 	       (aset key i (substring-no-properties (aref key i))))))
@@ -335,11 +349,12 @@ properties of the local machine."
 
 ;;;###tramp-autoload
 (defun tramp-list-connections ()
-  "Return a list of all known connection vectors according to `tramp-cache'."
+  "Return all known `tramp-file-name' structs according to `tramp-cache'."
     (let (result tramp-verbose)
       (maphash
        (lambda (key _value)
-	 (when (and (vectorp key) (null (aref key 3))
+	 (when (and (tramp-file-name-p key)
+		    (null (tramp-file-name-localname key))
 		    (tramp-connection-property-p key "process-buffer"))
 	   (add-to-list 'result key)))
        tramp-cache-data)
@@ -361,7 +376,7 @@ properties of the local machine."
 	;; possibility to use another login name later on.
 	(maphash
 	 (lambda (key value)
-	   (if (and (vectorp key)
+	   (if (and (tramp-file-name-p key)
 		    (not (tramp-file-name-localname key))
 		    (not (gethash "login-as" value)))
 	       (progn
@@ -402,7 +417,7 @@ for all methods.  Resulting data are derived from connection history."
   (let (res)
     (maphash
      (lambda (key _value)
-       (if (and (vectorp key)
+       (if (and (tramp-file-name-p key)
 		(string-equal method (tramp-file-name-method key))
 		(not (tramp-file-name-localname key)))
 	   (push (list (tramp-file-name-user key)
@@ -427,12 +442,13 @@ for all methods.  Resulting data are derived from connection history."
 	      element key item)
 	  (while (setq element (pop list))
 	    (setq key (pop element))
+	    (when (tramp-file-name-p key)
 	      (while (setq item (pop element))
 		;; We set only values which are not contained in
 		;; `tramp-connection-properties'.  The cache is
 		;; initialized properly by side effect.
 		(unless (tramp-connection-property-p key (car item))
-		(tramp-set-connection-property key (pop item) (car item))))))
+		  (tramp-set-connection-property key (pop item) (car item)))))))
 	(setq tramp-cache-data-changed nil))
     (file-error
      ;; Most likely because the file doesn't exist yet.  No message.

lisp/net/tramp-cmds.el

@@ -85,7 +85,9 @@ When called interactively, a Tramp connection has to be selected."
 	      (tramp-make-tramp-file-name
 	       (tramp-file-name-method x)
 	       (tramp-file-name-user x)
+	       (tramp-file-name-domain x)
 	       (tramp-file-name-host x)
+	       (tramp-file-name-port x)
 	       (tramp-file-name-localname x)))
 	    (tramp-list-connections)))
 	  name)

lisp/net/tramp-ftp.el

@@ -145,7 +145,7 @@ pass to the OPERATION."
        ((memq operation '(file-directory-p file-exists-p))
 	(if (apply 'ange-ftp-hook-function operation args)
 	    (let ((v (tramp-dissect-file-name (car args) t)))
-	      (aset v 0 tramp-ftp-method)
+	      (setf (tramp-file-name-method v) tramp-ftp-method)
 	      (tramp-set-connection-property v "started" t))
 	  nil))
 

lisp/net/tramp-gvfs.el

@@ -807,7 +807,8 @@ file names."
       ;; If there is a default location, expand tilde.
       (when (string-match "\\`\\(~\\)\\(/\\|\\'\\)" localname)
 	(save-match-data
-	  (tramp-gvfs-maybe-open-connection (vector method user host "/" hop)))
+	  (tramp-gvfs-maybe-open-connection
+	   (tramp-make-tramp-file-name method user domain host port "/" hop)))
 	(setq localname
 	      (replace-match
 	       (tramp-get-connection-property v "default-location" "~")
@@ -831,7 +832,7 @@ file names."
       ;; No tilde characters in file name, do normal
       ;; `expand-file-name' (this does "/./" and "/../").
       (tramp-make-tramp-file-name
-       method user host
+       method user domain host port
        (tramp-run-real-handler
 	'expand-file-name (list localname))))))
 
@@ -1249,7 +1250,7 @@ file-notify events."
 		    (concat (match-string 2 user) ";" (match-string 1 user))))
 	    (url-parse-make-urlobj
 	     method (and user (url-hexify-string user)) nil
-	     (tramp-file-name-real-host v) (tramp-file-name-port v)
+	     (tramp-file-name-host v) (tramp-file-name-port v)
 	     (and localname (url-hexify-string localname)) nil nil t))
 	(url-parse-make-urlobj
 	 "file" nil nil nil nil
@@ -1329,12 +1330,12 @@ ADDRESS can have the form \"xx:xx:xx:xx:xx:xx\" or \"[xx:xx:xx:xx:xx:xx]\"."
 	       t ;; password handled.
 	       nil ;; no abort of D-Bus.
 	       password
-	       (tramp-file-name-real-user l)
+	       (tramp-file-name-user l)
 	       domain
 	       nil ;; not anonymous.
 	       0) ;; no password save.
 	    ;; No password provided.
-	    (list nil t "" (tramp-file-name-real-user l) domain nil 0)))
+	    (list nil t "" (tramp-file-name-user l) domain nil 0)))
 
       ;; When QUIT is raised, we shall return this information to D-Bus.
       (quit (list nil t "" "" "" nil 0)))))
@@ -1420,7 +1421,7 @@ ADDRESS can have the form \"xx:xx:xx:xx:xx:xx\" or \"[xx:xx:xx:xx:xx:xx]\"."
 	(unless (zerop (length port))
 	  (setq host (concat host tramp-prefix-port-format port)))
 	(with-parsed-tramp-file-name
-	    (tramp-make-tramp-file-name method user host "") nil
+	    (tramp-make-tramp-file-name method user domain host port "") nil
 	  (tramp-message
 	   v 6 "%s %s"
 	   signal-name (tramp-gvfs-stringify-dbus-message mount-info))
@@ -1533,9 +1534,9 @@ It was \"a(say)\", but has changed to \"a{sv})\"."
 (defun tramp-gvfs-mount-spec (vec)
   "Return a mount-spec for \"org.gtk.vfs.MountTracker.mountLocation\"."
   (let* ((method (tramp-file-name-method vec))
-	 (user (tramp-file-name-real-user vec))
+	 (user (tramp-file-name-user vec))
 	 (domain (tramp-file-name-domain vec))
-	 (host (tramp-file-name-real-host vec))
+	 (host (tramp-file-name-host vec))
 	 (port (tramp-file-name-port vec))
 	 (localname (tramp-file-name-unquote-localname vec))
 	 (share (when (string-match "^/?\\([^/]+\\)" localname)
@@ -1591,7 +1592,9 @@ ID-FORMAT valid values are `string' and `integer'."
   (with-tramp-connection-property vec (format "uid-%s" id-format)
     (let ((method (tramp-file-name-method vec))
 	  (user (tramp-file-name-user vec))
+	  (domain (tramp-file-name-domain vec))
 	  (host (tramp-file-name-host vec))
+	  (port (tramp-file-name-port vec))
 	  (localname
 	   (tramp-get-connection-property vec "default-location" nil)))
       (cond
@@ -1599,7 +1602,8 @@ ID-FORMAT valid values are `string' and `integer'."
        (localname
 	(tramp-compat-file-attribute-user-id
 	 (file-attributes
-	  (tramp-make-tramp-file-name method user host localname) id-format)))
+	  (tramp-make-tramp-file-name method user domain host port localname)
+	  id-format)))
        ((equal id-format 'integer) tramp-unknown-id-integer)
        ((equal id-format 'string) tramp-unknown-id-string)))))
 
@@ -1609,14 +1613,17 @@ ID-FORMAT valid values are `string' and `integer'."
   (with-tramp-connection-property vec (format "gid-%s" id-format)
     (let ((method (tramp-file-name-method vec))
 	  (user (tramp-file-name-user vec))
+	  (domain (tramp-file-name-domain vec))
 	  (host (tramp-file-name-host vec))
+	  (port (tramp-file-name-port vec))
 	  (localname
 	   (tramp-get-connection-property vec "default-location" nil)))
       (cond
        (localname
 	(tramp-compat-file-attribute-group-id
 	 (file-attributes
-	  (tramp-make-tramp-file-name method user host localname) id-format)))
+	  (tramp-make-tramp-file-name method user domain host port localname)
+	  id-format)))
        ((equal id-format 'integer) tramp-unknown-id-integer)
        ((equal id-format 'string) tramp-unknown-id-string)))))
 
@@ -1644,11 +1651,13 @@ connection if a previous connection has died for some reason."
   (unless (tramp-gvfs-connection-mounted-p vec)
     (let* ((method (tramp-file-name-method vec))
 	   (user (tramp-file-name-user vec))
+	   (domain (tramp-file-name-domain vec))
 	   (host (tramp-file-name-host vec))
+	   (port (tramp-file-name-port vec))
 	   (localname (tramp-file-name-unquote-localname vec))
 	   (object-path
 	    (tramp-gvfs-object-path
-	     (tramp-make-tramp-file-name method user host ""))))
+	     (tramp-make-tramp-file-name method user domain host port ""))))
 
       (when (and (string-equal method "afp")
 		 (string-equal localname "/"))

lisp/net/tramp-sh.el

@@ -1122,7 +1122,7 @@ target of the symlink differ."
    "%s%s"
    (with-parsed-tramp-file-name (expand-file-name filename) nil
      (tramp-make-tramp-file-name
-      method user host
+      method user domain host port
       (with-tramp-file-property v localname "file-truename"
 	(let ((result nil)			; result steps in reverse order
 	      (quoted (tramp-compat-file-name-quoted-p localname))
@@ -1174,7 +1174,7 @@ target of the symlink differ."
 			(tramp-compat-file-attribute-type
 			 (file-attributes
 			  (tramp-make-tramp-file-name
-			   method user host
+			   method user domain host port
 			   (mapconcat 'identity
 				      (append '("")
 					      (reverse result)
@@ -2335,7 +2335,7 @@ The method used must be an out-of-band method."
   (let* ((t1 (tramp-tramp-file-p filename))
 	 (t2 (tramp-tramp-file-p newname))
 	 (orig-vec (tramp-dissect-file-name (if t1 filename newname)))
-	 copy-program copy-args copy-env copy-keep-date port listener spec
+	 copy-program copy-args copy-env copy-keep-date listener spec
 	 options source target remote-copy-program remote-copy-args)
 
     (with-parsed-tramp-file-name (if t1 filename newname) nil
@@ -2368,7 +2368,7 @@ The method used must be an out-of-band method."
 	      tramp-current-user (or (tramp-file-name-user v)
 				     (tramp-get-connection-property
 				      v "login-as" nil))
-	      tramp-current-host (tramp-file-name-real-host v))
+	      tramp-current-host (tramp-file-name-host v))
 
 	;; Check which ones of source and target are Tramp files.
 	(setq source (funcall
@@ -2383,10 +2383,6 @@ The method used must be an out-of-band method."
 			 (tramp-make-copy-program-file-name v)
 		       (tramp-unquote-shell-quote-argument newname)))
 
-	;; Check for host and port number.
-	(setq host (tramp-file-name-real-host v)
-	      port (tramp-file-name-port v))
-
 	;; Check for user.  There might be an interactive setting.
 	(setq user (or (tramp-file-name-user v)
 		       (tramp-get-connection-property v "login-as" nil)))
@@ -2809,7 +2805,7 @@ the result will be a local, non-Tramp, file name."
       ;; be problems with UNC shares or Cygwin mounts.
       (let ((default-directory (tramp-compat-temporary-file-directory)))
 	(tramp-make-tramp-file-name
-	 method user host
+	 method user domain host port
 	 (tramp-drop-volume-letter
 	  (tramp-run-real-handler
 	   'expand-file-name (list localname)))
@@ -2861,7 +2857,9 @@ the result will be a local, non-Tramp, file name."
 			   (tramp-make-tramp-file-name
 			    (tramp-file-name-method v)
 			    (tramp-file-name-user v)
+			    (tramp-file-name-domain v)
 			    (tramp-file-name-host v)
+			    (tramp-file-name-port v)
 			    (tramp-file-name-localname v))
 			   tramp-initial-end-of-output))
 	   ;; We use as environment the difference to toplevel
@@ -2999,7 +2997,8 @@ the result will be a local, non-Tramp, file name."
 	    (setq input (with-parsed-tramp-file-name infile nil localname))
 	  ;; INFILE must be copied to remote host.
 	  (setq input (tramp-make-tramp-temp-file v)
-		tmpinput (tramp-make-tramp-file-name method user host input))
+		tmpinput
+		(tramp-make-tramp-file-name method user domain host port input))
 	  (copy-file infile tmpinput t)))
       (when input (setq command (format "%s <%s" command input)))
 
@@ -3033,7 +3032,7 @@ the result will be a local, non-Tramp, file name."
 	    ;; file must be deleted after execution.
 	    (setq stderr (tramp-make-tramp-temp-file v)
 		  tmpstderr (tramp-make-tramp-file-name
-			     method user host stderr))))
+			     method user domain host port stderr))))
 	 ;; stderr to be discarded.
 	 ((null (cadr destination))
 	  (setq stderr "/dev/null"))))
@@ -4546,7 +4545,7 @@ Goes through the list `tramp-inline-compress-commands'."
     ;; host name.
     (let* ((v (car target-alist))
 	   (method (tramp-file-name-method v))
-	   (host (tramp-file-name-real-host v)))
+	   (host (tramp-file-name-host v)))
       (unless
 	  (or
 	   ;; There are multi-hops.
@@ -4623,8 +4622,8 @@ connection if a previous connection has died for some reason."
     ;; If Tramp opens the same connection within a short time frame,
     ;; there is a problem.  We shall signal this.
     (unless (or (tramp-compat-process-live-p p)
-		(not (equal (butlast (append vec nil) 2)
+		(not (tramp-file-name-equal-p
-			    (car tramp-current-connection)))
+		      vec (car tramp-current-connection)))
 		(> (tramp-time-diff
 		    (current-time) (cdr tramp-current-connection))
 		   (or tramp-connection-min-time-diff 0)))
@@ -4721,8 +4720,7 @@ connection if a previous connection has died for some reason."
 		(set-process-sentinel p 'tramp-process-sentinel)
 		(process-put p 'adjust-window-size-function 'ignore)
 		(set-process-query-on-exit-flag p nil)
-		(setq tramp-current-connection
+		(setq tramp-current-connection (cons vec (current-time))
-		      (cons (butlast (append vec nil) 2) (current-time))
 		      tramp-current-host (system-name))
 
 		(tramp-message
@@ -5104,7 +5102,7 @@ Return ATTR."
   "Create a file name suitable for `scp', `pscp', or `nc' and workalikes."
   (let ((method (tramp-file-name-method vec))
 	(user (tramp-file-name-user vec))
-	(host (tramp-file-name-real-host vec))
+	(host (tramp-file-name-host vec))
 	(localname
 	 (directory-file-name (tramp-file-name-unquote-localname vec))))
     (when (string-match tramp-ipv6-regexp host)
@@ -5218,7 +5216,9 @@ Nonexistent directories are removed from spec."
 	    (tramp-make-tramp-file-name
 	     (tramp-file-name-method vec)
 	     (tramp-file-name-user vec)
+	     (tramp-file-name-domain vec)
 	     (tramp-file-name-host vec)
+	     (tramp-file-name-port vec)
 	     x))
 	   x))
 	remote-path)))))
@@ -5636,14 +5636,14 @@ function cell is returned to be applied on a buffer."
 		 (let ((coding-system-for-write 'binary)
 		       (coding-system-for-read 'binary))
 		   (apply
-		    'tramp-call-process-region ,vec (point-min) (point-max)
+		    'tramp-call-process-region ',vec (point-min) (point-max)
 		    (car (split-string ,compress)) t t nil
 		    (cdr (split-string ,compress)))))
 	    `(lambda (beg end)
 	       (let ((coding-system-for-write 'binary)
 		     (coding-system-for-read 'binary))
 		 (apply
-		  'tramp-call-process-region ,vec beg end
+		  'tramp-call-process-region ',vec beg end
 		  (car (split-string ,compress)) t t nil
 		  (cdr (split-string ,compress))))
 	       (,coding (point-min) (point-max)))))

lisp/net/tramp-smb.el

@@ -53,12 +53,6 @@
       ;; Another guess.  We might implement a better check later on.
       (tramp-case-insensitive t))))
 
-;; Add a default for `tramp-default-method-alist'. Rule: If there is
-;; a domain in USER, it must be the SMB method.
-;;;###tramp-autoload
-(add-to-list 'tramp-default-method-alist
-	     `(nil ,tramp-prefix-domain-regexp ,tramp-smb-method))
-
 ;; Add a default for `tramp-default-user-alist'. Rule: For the SMB method,
 ;; the anonymous user is chosen.
 ;;;###tramp-autoload
@@ -449,15 +443,11 @@ pass to the OPERATION."
 	    (if (not (file-directory-p newname))
 		(make-directory newname parents))
 
-	    (setq tramp-current-method (tramp-file-name-method v)
+	    (setq tramp-current-method method
-		  tramp-current-user (tramp-file-name-user v)
+		  tramp-current-user user
-		  tramp-current-host (tramp-file-name-real-host v))
+		  tramp-current-host host)
 
-	    (let* ((real-user (tramp-file-name-real-user v))
+	    (let* ((share (tramp-smb-get-share v))
-		   (real-host (tramp-file-name-real-host v))
-		   (domain    (tramp-file-name-domain v))
-		   (port      (tramp-file-name-port v))
-		   (share     (tramp-smb-get-share v))
 		   (localname (file-name-as-directory
 			       (replace-regexp-in-string
 				"\\\\" "/" (tramp-smb-get-localname v))))
@@ -465,10 +455,10 @@ pass to the OPERATION."
 			       (expand-file-name
 				tramp-temp-name-prefix
 				(tramp-compat-temporary-file-directory))))
-		   (args      (list (concat "//" real-host "/" share) "-E")))
+		   (args      (list (concat "//" host "/" share) "-E")))
 
-	      (if (not (zerop (length real-user)))
+	      (if (not (zerop (length user)))
-		  (setq args (append args (list "-U" real-user)))
+		  (setq args (append args (list "-U" user)))
 		(setq args (append args (list "-N"))))
 
 	      (when domain (setq args (append args (list "-W" domain))))
@@ -708,7 +698,7 @@ PRESERVE-UID-GID and PRESERVE-EXTENDED-ATTRIBUTES are completely ignored."
 	(setq localname
 	      (replace-match
 	       (if (zerop (length (match-string 1 localname)))
-		   (tramp-file-name-real-user v)
+		   user
 		 (match-string 1 localname))
 	       nil nil localname)))
       ;; Make the file name absolute.
@@ -717,7 +707,7 @@ PRESERVE-UID-GID and PRESERVE-EXTENDED-ATTRIBUTES are completely ignored."
       ;; No tilde characters in file name, do normal
       ;; `expand-file-name' (this does "/./" and "/../").
       (tramp-make-tramp-file-name
-       method user host
+       method user domain host port
        (tramp-run-real-handler 'expand-file-name (list localname))))))
 
 (defun tramp-smb-action-get-acl (proc vec)
@@ -744,21 +734,17 @@ PRESERVE-UID-GID and PRESERVE-EXTENDED-ATTRIBUTES are completely ignored."
     (with-tramp-file-property v localname "file-acl"
       (when (executable-find tramp-smb-acl-program)
 
-	(setq tramp-current-method (tramp-file-name-method v)
+	(setq tramp-current-method method
-	      tramp-current-user (tramp-file-name-user v)
+	      tramp-current-user user
-	      tramp-current-host (tramp-file-name-real-host v))
+	      tramp-current-host host)
 
-	(let* ((real-user (tramp-file-name-real-user v))
+	(let* ((share     (tramp-smb-get-share v))
-	       (real-host (tramp-file-name-real-host v))
-	       (domain    (tramp-file-name-domain v))
-	       (port      (tramp-file-name-port v))
-	       (share     (tramp-smb-get-share v))
 	       (localname (replace-regexp-in-string
 			   "\\\\" "/" (tramp-smb-get-localname v)))
-	       (args      (list (concat "//" real-host "/" share) "-E")))
+	       (args      (list (concat "//" host "/" share) "-E")))
 
-	  (if (not (zerop (length real-user)))
+	  (if (not (zerop (length user)))
-	      (setq args (append args (list "-U" real-user)))
+	      (setq args (append args (list "-U" user)))
 	    (setq args (append args (list "-N"))))
 
 	  (when domain (setq args (append args (list "-W" domain))))
@@ -1179,7 +1165,8 @@ target of the symlink differ."
 	    (setq input (with-parsed-tramp-file-name infile nil localname))
 	  ;; INFILE must be copied to remote host.
 	  (setq input (tramp-make-tramp-temp-file v)
-		tmpinput (tramp-make-tramp-file-name method user host input))
+		tmpinput
+		(tramp-make-tramp-file-name method user domain host port input))
 	  (copy-file infile tmpinput t))
 	;; Transform input into a filename powershell does understand.
 	(setq input (format "//%s%s" host input)))
@@ -1337,24 +1324,20 @@ target of the symlink differ."
   (ignore-errors
     (with-parsed-tramp-file-name filename nil
       (when (and (stringp acl-string) (executable-find tramp-smb-acl-program))
-	(setq tramp-current-method (tramp-file-name-method v)
+	(setq tramp-current-method method
-	      tramp-current-user (tramp-file-name-user v)
+	      tramp-current-user user
-	      tramp-current-host (tramp-file-name-real-host v))
+	      tramp-current-host host)
 	(tramp-set-file-property v localname "file-acl" 'undef)
 
-	(let* ((real-user (tramp-file-name-real-user v))
+	(let* ((share     (tramp-smb-get-share v))
-	       (real-host (tramp-file-name-real-host v))
-	       (domain    (tramp-file-name-domain v))
-	       (port      (tramp-file-name-port v))
-	       (share     (tramp-smb-get-share v))
 	       (localname (replace-regexp-in-string
 			   "\\\\" "/" (tramp-smb-get-localname v)))
-	       (args      (list (concat "//" real-host "/" share) "-E" "-S"
+	       (args      (list (concat "//" host "/" share) "-E" "-S"
 				(replace-regexp-in-string
 				 "\n" "," acl-string))))
 
-	  (if (not (zerop (length real-user)))
+	  (if (not (zerop (length user)))
-	      (setq args (append args (list "-U" real-user)))
+	      (setq args (append args (list "-U" user)))
 	    (setq args (append args (list "-N"))))
 
 	  (when domain (setq args (append args (list "-W" domain))))
@@ -1847,22 +1830,20 @@ If ARGUMENT is non-nil, use it as argument for
 
 	(let* ((user   (tramp-file-name-user vec))
 	       (host   (tramp-file-name-host vec))
-	       (real-user (tramp-file-name-real-user vec))
-	       (real-host (tramp-file-name-real-host vec))
 	       (domain (tramp-file-name-domain vec))
 	       (port   (tramp-file-name-port vec))
 	       args)
 
 	  (cond
 	   (argument
-	    (setq args (list (concat "//" real-host))))
+	    (setq args (list (concat "//" host))))
 	   (share
-	    (setq args (list (concat "//" real-host "/" share))))
+	    (setq args (list (concat "//" host "/" share))))
 	   (t
-	    (setq args (list "-g" "-L" real-host ))))
+	    (setq args (list "-g" "-L" host ))))
 
-	  (if (not (zerop (length real-user)))
+	  (if (not (zerop (length user)))
-	      (setq args (append args (list "-U" real-user)))
+	      (setq args (append args (list "-U" user)))
 	    (setq args (append args (list "-N"))))
 
 	  (when domain (setq args (append args (list "-W" domain))))

lisp/net/tramp.el

@@ -1099,9 +1099,15 @@ means to use always cached values for the directory contents."
 (defvar tramp-current-user nil
   "Remote login name for this *tramp* buffer.")
 
+(defvar tramp-current-domain nil
+  "Remote domain name for this *tramp* buffer.")
+
 (defvar tramp-current-host nil
   "Remote host for this *tramp* buffer.")
 
+(defvar tramp-current-port nil
+  "Remote port for this *tramp* buffer.")
+
 (defvar tramp-current-connection nil
   "Last connection timestamp.")
 
@@ -1128,6 +1134,37 @@ calling HANDLER.")
 ;; internal data structure.  Convenience functions for internal
 ;; data structure.
 
+;; The basic structure for remote file names.  We use a list,
+;; otherwise the test in `tramp-cache-data' fails.
+(cl-defstruct (tramp-file-name (:type list) :named)
+  method user domain host port localname hop)
+
+(defun tramp-file-name-user-domain (vec)
+  "Return user and domain components of VEC."
+  (when (or (tramp-file-name-user vec) (tramp-file-name-domain vec))
+    (concat (tramp-file-name-user vec)
+	    (and (tramp-file-name-domain vec)
+		 tramp-prefix-domain-format)
+	    (tramp-file-name-domain vec))))
+
+(defun tramp-file-name-host-port (vec)
+  "Return host and port components of VEC."
+  (when (or (tramp-file-name-host vec) (tramp-file-name-port vec))
+    (concat (tramp-file-name-host vec)
+	    (and (tramp-file-name-port vec)
+		 tramp-prefix-port-format)
+	    (tramp-file-name-port vec))))
+
+(defun tramp-file-name-equal-p (vec1 vec2)
+  "Check, whether VEC1 and VEC2 denote the same `tramp-file-name'."
+  (and (tramp-file-name-p vec1) (tramp-file-name-p vec2)
+       (string-equal (tramp-file-name-method vec1)
+		     (tramp-file-name-method vec2))
+       (string-equal (tramp-file-name-user-domain vec1)
+		     (tramp-file-name-user-domain vec2))
+       (string-equal (tramp-file-name-host-port vec1)
+		     (tramp-file-name-host-port vec2))))
+
 (defun tramp-get-method-parameter (vec param)
   "Return the method parameter PARAM.
 If VEC is a vector, check first in connection properties.
@@ -1143,69 +1180,6 @@ entry does not exist, return nil."
 	     (assoc param (assoc (tramp-file-name-method vec) tramp-methods))))
 	(when methods-entry (cadr methods-entry))))))
 
-(defun tramp-file-name-p (vec)
-  "Check, whether VEC is a Tramp object."
-  (and (vectorp vec) (= 5 (length vec))))
-
-(defun tramp-file-name-method (vec)
-  "Return method component of VEC."
-  (and (tramp-file-name-p vec) (aref vec 0)))
-
-(defun tramp-file-name-user (vec)
-  "Return user component of VEC."
-  (and (tramp-file-name-p vec) (aref vec 1)))
-
-(defun tramp-file-name-host (vec)
-  "Return host component of VEC."
-  (and (tramp-file-name-p vec) (aref vec 2)))
-
-(defun tramp-file-name-localname (vec)
-  "Return localname component of VEC."
-  (and (tramp-file-name-p vec) (aref vec 3)))
-
-(defun tramp-file-name-hop (vec)
-  "Return hop component of VEC."
-  (and (tramp-file-name-p vec) (aref vec 4)))
-
-;; The user part of a Tramp file name vector can be of kind
-;; "user%domain".  Sometimes, we must extract these parts.
-(defun tramp-file-name-real-user (vec)
-  "Return the user name of VEC without domain."
-  (save-match-data
-    (let ((user (tramp-file-name-user vec)))
-      (if (and (stringp user)
-	       (string-match tramp-user-with-domain-regexp user))
-	  (match-string 1 user)
-	user))))
-
-(defun tramp-file-name-domain (vec)
-  "Return the domain name of VEC."
-  (save-match-data
-    (let ((user (tramp-file-name-user vec)))
-      (and (stringp user)
-	   (string-match tramp-user-with-domain-regexp user)
-	   (match-string 2 user)))))
-
-;; The host part of a Tramp file name vector can be of kind
-;; "host#port".  Sometimes, we must extract these parts.
-(defun tramp-file-name-real-host (vec)
-  "Return the host name of VEC without port."
-  (save-match-data
-    (let ((host (tramp-file-name-host vec)))
-      (if (and (stringp host)
-	       (string-match tramp-host-with-port-regexp host))
-	  (match-string 1 host)
-	host))))
-
-(defun tramp-file-name-port (vec)
-  "Return the port number of VEC."
-  (save-match-data
-    (let ((host (tramp-file-name-host vec)))
-      (or (and (stringp host)
-	       (string-match tramp-host-with-port-regexp host)
-	       (string-to-number (match-string 2 host)))
-	  (tramp-get-method-parameter vec 'tramp-default-port)))))
-
 ;; The localname can be quoted with "/:".  Extract this.
 (defun tramp-file-name-unquote-localname (vec)
   "Return unquoted localname component of VEC."
@@ -1299,43 +1273,67 @@ values."
 	    (user      (match-string (nth 2 (tramp-file-name-structure)) name))
 	    (host      (match-string (nth 3 (tramp-file-name-structure)) name))
 	    (localname (match-string (nth 4 (tramp-file-name-structure)) name))
-	    (hop       (match-string (nth 5 (tramp-file-name-structure)) name)))
+	    (hop       (match-string (nth 5 (tramp-file-name-structure)) name))
+	    domain port)
+	(when user
+	  (when (string-match tramp-user-with-domain-regexp user)
+	    (setq domain (match-string 2 user)
+		  user (match-string 1 user))))
+
 	(when host
+	  (when (string-match tramp-host-with-port-regexp host)
+	    (setq port (match-string 2 host)
+		  host (match-string 1 host)))
 	  (when (string-match (tramp-prefix-ipv6-regexp) host)
 	    (setq host (replace-match "" nil t host)))
 	  (when (string-match (tramp-postfix-ipv6-regexp) host)
 	    (setq host (replace-match "" nil t host))))
-	(if nodefault
+
-	    (vector method user host localname hop)
+	(unless nodefault
-	  (vector
+	  (setq method (tramp-find-method method user host)
-	   (tramp-find-method method user host)
+		user (tramp-find-user method user host)
-	   (tramp-find-user   method user host)
+		host (tramp-find-host method user host)))
-	   (tramp-find-host   method user host)
+
-	   localname hop))))))
+	(apply
+	 'make-tramp-file-name
+	 (append
+	  (unless (zerop (length method)) `(:method ,method))
+	  (unless (zerop (length user))   `(:user ,user))
+	  (unless (zerop (length domain)) `(:domain ,domain))
+	  (unless (zerop (length host))   `(:host ,host))
+	  (unless (zerop (length port))   `(:port ,port))
+	  `(:localname ,(or localname ""))
+	  (unless (zerop (length hop))     `(:hop ,hop))))))))
 
 (defun tramp-buffer-name (vec)
   "A name for the connection buffer VEC."
   (let ((method (tramp-file-name-method vec))
-	(user   (tramp-file-name-user vec))
+	(user-domain (tramp-file-name-user-domain vec))
-	(host   (tramp-file-name-real-host vec)))
+	(host-port (tramp-file-name-host-port vec)))
-    (if (not (zerop (length user)))
+    (if (not (zerop (length user-domain)))
-	(format "*tramp/%s %s@%s*" method user host)
+	(format "*tramp/%s %s@%s*" method user-domain host-port)
-      (format "*tramp/%s %s*" method host))))
+      (format "*tramp/%s %s*" method host-port))))
 
-(defun tramp-make-tramp-file-name (method user host localname &optional hop)
+(defun tramp-make-tramp-file-name
+    (method user domain host port localname &optional hop)
   "Constructs a Tramp file name from METHOD, USER, HOST and LOCALNAME.
-When not nil, an optional HOP is prepended."
+When not nil, optional DOMAIN, PORT and HOP are used."
   (concat (tramp-prefix-format) hop
 	  (unless (or (zerop (length method))
                       (zerop (length (tramp-postfix-method-format))))
 	    (concat method (tramp-postfix-method-format)))
+	  user
+	  (unless (zerop (length domain))
+	    (concat tramp-prefix-domain-format domain))
 	  (unless (zerop (length user))
-	    (concat user tramp-postfix-user-format))
+	   tramp-postfix-user-format)
 	  (when host
 	    (if (string-match tramp-ipv6-regexp host)
 		(concat
                  (tramp-prefix-ipv6-format) host (tramp-postfix-ipv6-format))
 	      host))
+	  (unless (zerop (length port))
+	    (concat tramp-prefix-port-format port))
 	  (tramp-postfix-host-format)
 	  (when localname localname)))
 
@@ -1372,7 +1370,9 @@ necessary only.  This function will be used in file name completion."
 	      (tramp-make-tramp-file-name
 	       (tramp-file-name-method vec)
 	       (tramp-file-name-user vec)
+	       (tramp-file-name-domain vec)
 	       (tramp-file-name-host vec)
+	       (tramp-file-name-port vec)
 	       "/"))
 	(current-buffer))))
 
@@ -1406,8 +1406,8 @@ version, the function does nothing."
      'hack-connection-local-variables-apply
      `(:application tramp
        :protocol    ,(tramp-file-name-method vec)
-       :user        ,(tramp-file-name-user vec)
+       :user        ,(tramp-file-name-user-domain vec)
-       :machine     ,(tramp-file-name-host vec)))))
+       :machine     ,(tramp-file-name-host-port vec)))))
 
 (defun tramp-set-connection-local-variables-for-buffer ()
   "Set connection-local variables in the current buffer.
@@ -1425,11 +1425,11 @@ version, the function does nothing."
 (defun tramp-debug-buffer-name (vec)
   "A name for the debug buffer for VEC."
   (let ((method (tramp-file-name-method vec))
-	(user   (tramp-file-name-user vec))
+	(user-domain (tramp-file-name-user-domain vec))
-	(host   (tramp-file-name-real-host vec)))
+	(host-port (tramp-file-name-host-port vec)))
-    (if (not (zerop (length user)))
+    (if (not (zerop (length user-domain)))
-	(format "*debug tramp/%s %s@%s*" method user host)
+	(format "*debug tramp/%s %s@%s*" method user-domain host-port)
-      (format "*debug tramp/%s %s*" method host))))
+      (format "*debug tramp/%s %s*" method host-port))))
 
 (defconst tramp-debug-outline-regexp
   "[0-9]+:[0-9]+:[0-9]+\\.[0-9]+ [a-z0-9-]+ (\\([0-9]+\\)) #"
@@ -1576,7 +1576,7 @@ applicable)."
 		(setq fmt-string (concat fmt-string "\n%s")
 		      arguments (append arguments (list (buffer-string)))))))
 	  ;; Do it.
-	  (when (vectorp vec-or-proc)
+	  (when (tramp-file-name-p vec-or-proc)
 	    (apply 'tramp-debug-message
 		   vec-or-proc
 		   (concat (format "(%d) # " level) fmt-string)
@@ -1615,9 +1615,9 @@ an input event arrives.  The other arguments are passed to `tramp-error'."
   (save-window-excursion
     (let* ((buf (or (and (bufferp buf) buf)
 		    (and (processp vec-or-proc) (process-buffer vec-or-proc))
-		    (and (vectorp vec-or-proc)
+		    (and (tramp-file-name-p vec-or-proc)
 			 (tramp-get-connection-buffer vec-or-proc))))
-	   (vec (or (and (vectorp vec-or-proc) vec-or-proc)
+	   (vec (or (and (tramp-file-name-p vec-or-proc) vec-or-proc)
 		    (and buf (with-current-buffer buf
 			       (tramp-dissect-file-name default-directory))))))
       (unwind-protect
@@ -1639,8 +1639,7 @@ an input event arrives.  The other arguments are passed to `tramp-error'."
 	    (discard-input)
 	    (sit-for 30)))
 	;; Reset timestamp.  It would be wrong after waiting for a while.
-	(when (equal (butlast (append vec nil) 2)
+	(when (tramp-file-name-equal-p vec (car tramp-current-connection))
-		     (car tramp-current-connection))
 	  (setcdr tramp-current-connection (current-time)))))))
 
 (defmacro with-parsed-tramp-file-name (filename var &rest body)
@@ -1664,7 +1663,7 @@ If VAR is nil, then we bind `v' to the structure and `method', `user',
                    `(,(if var (intern (format "%s-%s" var elem)) elem)
                      (,(intern (format "tramp-file-name-%s" elem))
                       ,(or var 'v))))
-                 '(method user host localname hop))))
+                 '(method user domain host port localname hop))))
     `(let* ((,(or var 'v) (tramp-dissect-file-name ,filename))
             ,@bindings)
        ;; We don't know which of those vars will be used, so we bind them all,
@@ -2508,15 +2507,13 @@ remote host and localname (filename on remote host)."
 
   (save-match-data
     (when (string-match (nth 0 structure) name)
-      (let ((method    (and (nth 1 structure)
+      (make-tramp-file-name
-			    (match-string (nth 1 structure) name)))
+       :method (and (nth 1 structure)
-	    (user      (and (nth 2 structure)
+		    (match-string (nth 1 structure) name))
-			    (match-string (nth 2 structure) name)))
+       :user (and (nth 2 structure)
-	    (host      (and (nth 3 structure)
+		  (match-string (nth 2 structure) name))
-			    (match-string (nth 3 structure) name)))
+       :host (and (nth 3 structure)
-	    (localname (and (nth 4 structure)
+		  (match-string (nth 3 structure) name))))))
-			    (match-string (nth 4 structure) name))))
-	(vector method user host localname nil)))))
 
 ;; This function returns all possible method completions, adding the
 ;; trailing method delimiter.
@@ -2862,7 +2859,9 @@ User is always nil."
     (tramp-make-tramp-file-name
      (tramp-file-name-method v)
      (tramp-file-name-user v)
+     (tramp-file-name-domain v)
      (tramp-file-name-host v)
+     (tramp-file-name-port v)
      (if (and (zerop (length (tramp-file-name-localname v)))
               (not (tramp-connectable-p file)))
 	 ""
@@ -2951,7 +2950,9 @@ User is always nil."
     (tramp-make-tramp-file-name
      (tramp-file-name-method v)
      (tramp-file-name-user v)
+     (tramp-file-name-domain v)
      (tramp-file-name-host v)
+     (tramp-file-name-port v)
      (tramp-run-real-handler
       'file-name-directory (list (or (tramp-file-name-localname v) "")))
      (tramp-file-name-hop v))))
@@ -2993,11 +2994,13 @@ User is always nil."
 	  (and (or (not connected) c)
 	       (cond
 		((eq identification 'method) method)
-		((eq identification 'user) user)
+		;; Domain and port are appended.
-		((eq identification 'host) host)
+		((eq identification 'user) (tramp-file-name-user-domain v))
+		((eq identification 'host) (tramp-file-name-host-port v))
 		((eq identification 'localname) localname)
 		((eq identification 'hop) hop)
-		(t (tramp-make-tramp-file-name method user host "" hop)))))))))
+		(t (tramp-make-tramp-file-name
+		    method user domain host port "" hop)))))))))
 
 (defun tramp-handle-file-symlink-p (filename)
   "Like `file-symlink-p' for Tramp files."
@@ -3005,7 +3008,7 @@ User is always nil."
     (let ((x (tramp-compat-file-attribute-type (file-attributes filename))))
       (when (stringp x)
 	(if (file-name-absolute-p x)
-	    (tramp-make-tramp-file-name method user host x)
+	    (tramp-make-tramp-file-name method user domain host port x)
 	  x)))))
 
 (defun tramp-handle-find-backup-file-name (filename)
@@ -3020,7 +3023,8 @@ User is always nil."
 		   (if (and (stringp (cdr x))
 			    (file-name-absolute-p (cdr x))
 			    (not (tramp-file-name-p (cdr x))))
-		       (tramp-make-tramp-file-name method user host (cdr x))
+		       (tramp-make-tramp-file-name
+			method user domain host port (cdr x))
 		     (cdr x))))
 		tramp-backup-directory-alist)
 	     backup-directory-alist)))
@@ -3125,7 +3129,7 @@ User is always nil."
 			     ((stringp remote-copy)
 			      (file-local-copy
 			       (tramp-make-tramp-file-name
-				method user host remote-copy)))
+				method user domain host port remote-copy)))
 			     ((stringp tramp-temp-buffer-file-name)
 			      (copy-file
 			       filename tramp-temp-buffer-file-name 'ok)
@@ -3170,7 +3174,8 @@ User is always nil."
 	    (delete-file local-copy))
 	  (when (stringp remote-copy)
 	    (delete-file
-	     (tramp-make-tramp-file-name method user host remote-copy)))))
+	     (tramp-make-tramp-file-name
+	      method user domain host port remote-copy)))))
 
       ;; Result.
       (list (expand-file-name filename)
@@ -3548,7 +3553,8 @@ connection buffer."
   (tramp-set-connection-property
    (tramp-dissect-file-name
     (tramp-make-tramp-file-name
-     tramp-current-method tramp-current-user tramp-current-host ""))
+     tramp-current-method tramp-current-user tramp-current-domain
+     tramp-current-host tramp-current-port ""))
    "first-password-request" t)
   (save-restriction
     (with-tramp-progress-reporter
@@ -3933,7 +3939,9 @@ be granted."
 		 (tramp-make-tramp-file-name
 		  (tramp-file-name-method vec)
 		  (tramp-file-name-user vec)
+		  (tramp-file-name-domain vec)
 		  (tramp-file-name-host vec)
+		  (tramp-file-name-port vec)
 		  (tramp-file-name-localname vec)
 		  (tramp-file-name-hop vec))
 		 (intern suffix))))
@@ -3979,12 +3987,13 @@ be granted."
 ;;;###tramp-autoload
 (defun tramp-local-host-p (vec)
   "Return t if this points to the local host, nil otherwise."
-  ;; We cannot use `tramp-file-name-real-host'.  A port is an
+  (let ((host (tramp-file-name-host vec))
-  ;; indication for an ssh tunnel or alike.
+	(port (tramp-file-name-port vec)))
-  (let ((host (tramp-file-name-host vec)))
     (and
      (stringp host)
      (string-match tramp-local-host-regexp host)
+     ;; A port is an indication for an ssh tunnel or alike.
+     (null port)
      ;; The method shall be applied to one of the shell file name
      ;; handlers.  `tramp-local-host-p' is also called for "smb" and
      ;; alike, where it must fail.
@@ -3994,7 +4003,8 @@ be granted."
       (tramp-make-tramp-file-name
        (tramp-file-name-method vec)
        (tramp-file-name-user vec)
-       host
+       (tramp-file-name-domain vec)
+       host port
        (tramp-compat-temporary-file-directory)))
      ;; On some systems, chown runs only for root.
      (or (zerop (user-uid))
@@ -4008,7 +4018,9 @@ be granted."
     (let ((dir (tramp-make-tramp-file-name
 		(tramp-file-name-method vec)
 		(tramp-file-name-user vec)
+		(tramp-file-name-domain vec)
 		(tramp-file-name-host vec)
+		(tramp-file-name-port vec)
 		(or (tramp-get-method-parameter vec 'tramp-tmpdir) "/tmp")
 		(tramp-file-name-hop vec))))
       (or (and (file-directory-p dir) (file-writable-p dir)
@@ -4124,8 +4136,9 @@ PROGRAM is nil is trapped also, returning 1.  Furthermore, traces
 are written with verbosity of 6."
   (let ((default-directory  (tramp-compat-temporary-file-directory))
 	(v (or vec
-	       (vector tramp-current-method tramp-current-user
+	       (tramp-make-tramp-file-name
-		       tramp-current-host nil nil)))
+		tramp-current-method tramp-current-user tramp-current-domain
+		tramp-current-host tramp-current-port nil nil)))
 	(destination (if (eq destination t) (current-buffer) destination))
 	output error result)
     (tramp-message
@@ -4159,8 +4172,9 @@ PROGRAM is nil is trapped also, returning 1.  Furthermore, traces
 are written with verbosity of 6."
   (let ((default-directory  (tramp-compat-temporary-file-directory))
 	(v (or vec
-	       (vector tramp-current-method tramp-current-user
+	       (tramp-make-tramp-file-name
-		       tramp-current-host nil nil)))
+		tramp-current-method tramp-current-user tramp-current-domain
+		tramp-current-host tramp-current-port nil nil)))
 	(buffer (if (eq buffer t) (current-buffer) buffer))
 	result)
     (tramp-message
@@ -4191,8 +4205,8 @@ Consults the auth-source package.
 Invokes `password-read' if available, `read-passwd' else."
   (let* ((case-fold-search t)
 	 (key (tramp-make-tramp-file-name
-	       tramp-current-method tramp-current-user
+	       tramp-current-method tramp-current-user tramp-current-domain
-	       tramp-current-host ""))
+	       tramp-current-host tramp-current-port ""))
 	 (pw-prompt
 	  (or prompt
 	      (with-current-buffer (process-buffer proc)
@@ -4248,7 +4262,9 @@ Invokes `password-read' if available, `read-passwd' else."
   "Clear password cache for connection related to VEC."
   (let ((method (tramp-file-name-method vec))
 	(user (tramp-file-name-user vec))
+	(domain (tramp-file-name-domain vec))
 	(host (tramp-file-name-host vec))
+	(port (tramp-file-name-port vec))
 	(hop (tramp-file-name-hop vec)))
     (when hop
       ;; Clear also the passwords of the hops.
@@ -4266,7 +4282,8 @@ Invokes `password-read' if available, `read-passwd' else."
 	 `(:max 1 ,(and user :user) ,user :host ,host :port ,method))
       (tramp-compat-funcall
        'auth-source-forget-user-or-password "password" host method))
-    (password-cache-remove (tramp-make-tramp-file-name method user host ""))))
+    (password-cache-remove
+     (tramp-make-tramp-file-name method user domain host port ""))))
 
 ;; Snarfed code from time-date.el.
 
@@ -4393,12 +4410,6 @@ Only works for Bourne-like shells."
 ;;   <http://www.mail-archive.com/tramp-devel@nongnu.org/msg01041.html>.
 ;;   (Bug#6850)
 ;;
-;; * Use also port to distinguish connections.  This is needed for
-;;   different hosts sitting behind a single router (distinguished by
-;;   different port numbers).  (Tzvi Edelman)
-;;   Also needed for different systems serve SSH on different ports of
-;;   the same IP address.  (Bug#27009)
-;;
 ;; * Refactor code from different handlers.  Start with
 ;;   *-process-file.  One idea is to generalize `tramp-send-command'
 ;;   and friends, for most of the handlers this is the major