lisp/net/netrc.el

   1 ;;; netrc.el --- .netrc parsing functionality
   2 ;; Copyright (C) 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004,
   3 ;;   2005, 2006, 2007, 2008, 2009 Free Software Foundation, Inc.
   4
   5 ;; Author: Lars Magne Ingebrigtsen <larsi@gnus.org>
   6 ;; Keywords: news
   7 ;;  Modularized by Ted Zlatanov <tzz@lifelogs.com>
   8 ;;  when it was part of Gnus.
   9
  10 ;; This file is part of GNU Emacs.
  11
  12 ;; GNU Emacs is free software: you can redistribute it and/or modify
  13 ;; it under the terms of the GNU General Public License as published by
  14 ;; the Free Software Foundation, either version 3 of the License, or
  15 ;; (at your option) any later version.
  16
  17 ;; GNU Emacs is distributed in the hope that it will be useful,
  18 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
  19 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  20 ;; GNU General Public License for more details.
  21
  22 ;; You should have received a copy of the GNU General Public License
  23 ;; along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.
  24
  25 ;;; Commentary:
  26
  27 ;; Just the .netrc parsing functionality, abstracted so other packages
  28 ;; besides Gnus can use it.
  29
  30 ;;; Code:
  31
  32 ;;;
  33 ;;; .netrc and .authinfo rc parsing
  34 ;;;
  35
  36 ;; use encrypt if loaded (encrypt-file-alist has to be set as well)
  37 (autoload 'encrypt-find-model "encrypt")
  38 (autoload 'encrypt-insert-file-contents "encrypt")
  39 (defalias 'netrc-point-at-eol
  40   (if (fboundp 'point-at-eol)
  41       'point-at-eol
  42     'line-end-position))
  43 (defvar encrypt-file-alist)
  44 (eval-when-compile
  45   ;; This is unnecessary in the compiled version as it is a macro.
  46   (if (fboundp 'bound-and-true-p)
  47       (defalias 'netrc-bound-and-true-p 'bound-and-true-p)
  48     (defmacro netrc-bound-and-true-p (var)
  49       "Return the value of symbol VAR if it is bound, else nil."
  50       `(and (boundp (quote ,var)) ,var))))
  51
  52 (defgroup netrc nil
  53  "Netrc configuration."
  54  :group 'comm)
  55
  56 (defvar netrc-services-file "/etc/services"
  57   "The name of the services file.")
  58
  59 (defun netrc-parse (file)
  60   (interactive "fFile to Parse: ")
  61   "Parse FILE and return a list of all entries in the file."
  62   (if (listp file)
  63       file
  64     (when (file-exists-p file)
  65       (with-temp-buffer
  66         (let ((tokens '("machine" "default" "login"
  67                         "password" "account" "macdef" "force"
  68                         "port"))
  69               (encryption-model (when (netrc-bound-and-true-p encrypt-file-alist)
  70                                   (encrypt-find-model file)))
  71               alist elem result pair)
  72           (if encryption-model
  73               (encrypt-insert-file-contents file encryption-model)
  74             (insert-file-contents file))
  75           (goto-char (point-min))
  76           ;; Go through the file, line by line.
  77           (while (not (eobp))
  78             (narrow-to-region (point) (point-at-eol))
  79             ;; For each line, get the tokens and values.
  80             (while (not (eobp))
  81               (skip-chars-forward "\t ")
  82               ;; Skip lines that begin with a "#".
  83               (if (eq (char-after) ?#)
  84                   (goto-char (point-max))
  85                 (unless (eobp)
  86                   (setq elem
  87                         (if (= (following-char) ?\")
  88                             (read (current-buffer))
  89                           (buffer-substring
  90                            (point) (progn (skip-chars-forward "^\t ")
  91                                           (point)))))
  92                   (cond
  93                    ((equal elem "macdef")
  94                     ;; We skip past the macro definition.
  95                     (widen)
  96                     (while (and (zerop (forward-line 1))
  97                                 (looking-at "$")))
  98                     (narrow-to-region (point) (point)))
  99                    ((member elem tokens)
 100                     ;; Tokens that don't have a following value are ignored,
 101                     ;; except "default".
 102                     (when (and pair (or (cdr pair)
 103                                         (equal (car pair) "default")))
 104                       (push pair alist))
 105                     (setq pair (list elem)))
 106                    (t
 107                     ;; Values that haven't got a preceding token are ignored.
 108                     (when pair
 109                       (setcdr pair elem)
 110                       (push pair alist)
 111                       (setq pair nil)))))))
 112             (when alist
 113               (push (nreverse alist) result))
 114             (setq alist nil
 115                   pair nil)
 116             (widen)
 117             (forward-line 1))
 118           (nreverse result))))))
 119
 120 (defun netrc-machine (list machine &optional port defaultport)
 121   "Return the netrc values from LIST for MACHINE or for the default entry.
 122 If PORT specified, only return entries with matching port tokens.
 123 Entries without port tokens default to DEFAULTPORT."
 124   (let ((rest list)
 125         result)
 126     (while list
 127       (when (equal (cdr (assoc "machine" (car list))) machine)
 128         (push (car list) result))
 129       (pop list))
 130     (unless result
 131       ;; No machine name matches, so we look for default entries.
 132       (while rest
 133         (when (assoc "default" (car rest))
 134           (push (car rest) result))
 135         (pop rest)))
 136     (when result
 137       (setq result (nreverse result))
 138       (while (and result
 139                   (not (netrc-port-equal
 140                         (or port defaultport "nntp")
 141                         ;; when port is not given in the netrc file,
 142                         ;; it should mean "any port"
 143                         (or (netrc-get (car result) "port")
 144                             defaultport port))))
 145         (pop result))
 146       (car result))))
 147
 148 (defun netrc-machine-user-or-password (mode authinfo-file-or-list machines ports defaults)
 149   "Get the user name or password according to MODE from AUTHINFO-FILE-OR-LIST.
 150 Matches a machine from MACHINES and a port from PORTS, giving
 151 default ports DEFAULTS to `netrc-machine'.
 152
 153 MODE can be \"login\" or \"password\", suitable for passing to
 154 `netrc-get'."
 155   (let ((authinfo-list (if (stringp authinfo-file-or-list)
 156                            (netrc-parse authinfo-file-or-list)
 157                          authinfo-file-or-list))
 158         (ports (or ports '(nil)))
 159         (defaults (or defaults '(nil)))
 160         info)
 161     (if (listp mode)
 162         (setq info
 163               (mapcar
 164                (lambda (mode-element)
 165                  (netrc-machine-user-or-password
 166                   mode-element
 167                   authinfo-list
 168                   machines
 169                   ports
 170                   defaults))
 171                mode))
 172       (dolist (machine machines)
 173         (dolist (default defaults)
 174           (dolist (port ports)
 175             (let ((alist (netrc-machine authinfo-list machine port default)))
 176               (setq info (or (netrc-get alist mode) info)))))))
 177     info))
 178
 179 (defun netrc-get (alist type)
 180   "Return the value of token TYPE from ALIST."
 181   (cdr (assoc type alist)))
 182
 183 (defun netrc-port-equal (port1 port2)
 184   (when (numberp port1)
 185     (setq port1 (or (netrc-find-service-name port1) port1)))
 186   (when (numberp port2)
 187     (setq port2 (or (netrc-find-service-name port2) port2)))
 188   (equal port1 port2))
 189
 190 (defun netrc-parse-services ()
 191   (when (file-exists-p netrc-services-file)
 192     (let ((services nil))
 193       (with-temp-buffer
 194         (insert-file-contents netrc-services-file)
 195         (while (search-forward "#" nil t)
 196           (delete-region (1- (point)) (point-at-eol)))
 197         (goto-char (point-min))
 198         (while (re-search-forward
 199                 "^ *\\([^ \n\t]+\\)[ \t]+\\([0-9]+\\)/\\([^ \t\n]+\\)" nil t)
 200           (push (list (match-string 1) (string-to-number (match-string 2))
 201                       (intern (downcase (match-string 3))))
 202                 services))
 203         (nreverse services)))))
 204
 205 (defun netrc-find-service-name (number &optional type)
 206   (let ((services (netrc-parse-services))
 207         service)
 208     (setq type (or type 'tcp))
 209     (while (and (setq service (pop services))
 210                 (not (and (= number (cadr service))
 211                           (eq type (car (cddr service)))))))
 212     (car service)))
 213
 214 (defun netrc-find-service-number (name &optional type)
 215   (let ((services (netrc-parse-services))
 216         service)
 217     (setq type (or type 'tcp))
 218     (while (and (setq service (pop services))
 219                 (not (and (string= name (car service))
 220                           (eq type (car (cddr service)))))))
 221     (cadr service)))
 222
 223 (provide 'netrc)
 224
 225 ;; arch-tag: af9929cc-2d12-482f-936e-eb4366f9fa55
 226 ;;; netrc.el ends here