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;;; erc-identd.el --- RFC1413 (identd authentication protocol) server
;; Copyright (C) 2003, 2006, 2007 Free Software Foundation, Inc.
;; Author: John Wiegley <johnw@gnu.org>
;; 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., 51 Franklin Street, Fifth Floor,
;; Boston, MA 02110-1301, USA.
;;; Commentary:
;; This module allows you to run a local identd server on port 8113.
;; You will need to set up DNAT to bind 113->8113, or use a proxy.
;; To use this module, add identd to `erc-modules' and run
;; `erc-update-modules'.
;; Here is an example /etc/inetd.conf rule that forwards identd
;; traffic to port 8113. You will need simpleproxy installed for it
;; to work.
;; 113 stream tcp nowait nobody /usr/sbin/tcpd /usr/bin/simpleproxy simpleproxy -i -R 127.0.0.1:8113
;;; Code:
(require 'erc)
(defvar erc-identd-process nil)
;;;###autoload (autoload 'erc-identd-mode "erc-identd")
(define-erc-module identd nil
"This mode launches an identd server on port 8113."
((add-hook 'erc-connect-pre-hook 'erc-identd-start)
(add-hook 'erc-disconnected-hook 'erc-identd-stop))
((remove-hook 'erc-connect-pre-hook 'erc-identd-start)
(remove-hook 'erc-disconnected-hook 'erc-identd-stop)))
(defun erc-identd-filter (proc string)
"This filter implements RFC1413 (identd authentication protocol)."
(let ((erc-identd-process proc))
(when (string-match "\\([0-9]+\\)\\s-*,\\s-*\\([0-9]+\\)" string)
(let ((port-on-server (match-string 1 string))
(port-on-client (match-string 2 string)))
(send-string erc-identd-process
(format "%s, %s : USERID : %s : %s\n"
port-on-server port-on-client
system-type (user-login-name)))
(process-send-eof erc-identd-process)))))
;;;###autoload
(defun erc-identd-start (&optional port)
"Start an identd server listening to port 8113.
Port 113 (auth) will need to be redirected to port 8113 on your
machine -- using iptables, or a program like redir which can be
run from inetd. The idea is to provide a simple identd server
when you need one, without having to install one globally on your
system."
(interactive (list (read-string "Serve identd requests on port: " "8113")))
(if (null port)
(setq port 8113)
(if (stringp port)
(setq port (string-to-number port))))
(if erc-identd-process
(delete-process erc-identd-process))
(setq erc-identd-process
(make-network-process :name "identd"
:buffer nil
:host 'local :service port
:server t :noquery t :nowait t
:filter 'erc-identd-filter))
(set-process-query-on-exit-flag erc-identd-process nil))
;;;###autoload
(defun erc-identd-stop (&rest ignore)
(interactive)
(when erc-identd-process
(delete-process erc-identd-process)
(setq erc-identd-process nil)))
(provide 'erc-identd)
;;; erc-identd.el ends here
;;
;; Local Variables:
;; indent-tabs-mode: t
;; tab-width: 8
;; End:
;; arch-tag: e0b5f926-0f35-40b9-8ddb-ca06b62a7544
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