lisp/erc/erc-identd.el

   1 ;;; erc-identd.el --- RFC1413 (identd authentication protocol) server
   2
   3 ;; Copyright (C) 2003, 2006 Free Software Foundation, Inc.
   4
   5 ;; Author: John Wiegley <johnw@gnu.org>
   6 ;; Keywords: comm, processes
   7
   8 ;; This file is part of GNU Emacs.
   9
  10 ;; GNU Emacs is free software; you can redistribute it and/or modify
  11 ;; it under the terms of the GNU General Public License as published by
  12 ;; the Free Software Foundation; either version 2, or (at your option)
  13 ;; any later version.
  14
  15 ;; GNU Emacs is distributed in the hope that it will be useful,
  16 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
  17 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18 ;; GNU General Public License for more details.
  19
  20 ;; You should have received a copy of the GNU General Public License
  21 ;; along with GNU Emacs; see the file COPYING.  If not, write to the
  22 ;; Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
  23 ;; Boston, MA 02110-1301, USA.
  24
  25 ;;; Commentary:
  26
  27 ;; You can have a local identd server (running on port 8113; I use DNAT
  28 ;; to bind 113->8113) if you add this to .emacs.el:
  29
  30 ;;    (add-hook 'erc-connect-pre-hook 'erc-identd-start)
  31 ;;    (add-hook 'erc-disconnected-hook 'erc-identd-stop)
  32
  33 ;;; Code:
  34
  35 (defvar erc-identd-process nil)
  36
  37 (defun erc-identd-filter (proc string)
  38   "This filter implements RFC1413 (identd authentication protocol)."
  39   (let ((erc-identd-process proc))
  40     (when (string-match "\\([0-9]+\\)\\s-*,\\s-*\\([0-9]+\\)" string)
  41       (let ((port-on-server (match-string 1 string))
  42             (port-on-client (match-string 2 string)))
  43         (send-string erc-identd-process
  44                      (format "%s, %s : USERID : %s : %s\n"
  45                              port-on-server port-on-client
  46                              system-type (user-login-name)))
  47         (process-send-eof erc-identd-process)))))
  48
  49 (defun erc-identd-start (&optional port)
  50   "Start an identd server listening to port 8113.
  51 Port 113 (auth) will need to be redirected to port 8113 on your
  52 machine -- using iptables, or a program like redir which can be
  53 run from inetd.  The idea is to provide a simple identd server
  54 when you need one, without having to install one globally on your
  55 system."
  56   (interactive (list (read-string "Serve identd requests on port: " "8113")))
  57   (if (null port)
  58       (setq port 8113)
  59     (if (stringp port)
  60         (setq port (string-to-number port))))
  61   (if erc-identd-process
  62       (delete-process erc-identd-process))
  63   (if (fboundp 'make-network-process)
  64       (setq erc-identd-process
  65             (make-network-process :name "identd"
  66                                   :buffer (generate-new-buffer "identd")
  67                                   :service port :server t :noquery t
  68                                   :filter 'erc-identd-filter))
  69     (open-network-stream-server "identd" (generate-new-buffer "identd")
  70                                 port nil 'erc-identd-filter)))
  71
  72 (defun erc-identd-stop (&rest ignore)
  73   (interactive)
  74   (when erc-identd-process
  75     (delete-process erc-identd-process)
  76     (setq erc-identd-process nil)))
  77
  78 (provide 'erc-identd)
  79
  80 ;;; erc-identd.el ends here
  81 ;;
  82 ;; Local Variables:
  83 ;; indent-tabs-mode: t
  84 ;; tab-width: 8
  85 ;; End:
  86
  87 ;; arch-tag: e0b5f926-0f35-40b9-8ddb-ca06b62a7544