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;;; erc-identd.el --- RFC1413 (identd authentication protocol) server
;; Copyright (C) 2003, 2006-2021 Free Software Foundation, Inc.
;; Author: John Wiegley <johnw@gnu.org>
;; Maintainer: Amin Bandali <bandali@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 3 of the License, 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. If not, see <https://www.gnu.org/licenses/>.
;;; 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)
(defgroup erc-identd nil
"Run a local identd server."
:group 'erc)
(defcustom erc-identd-port 8113
"Port to run the identd server on if not specified in the argument for
`erc-identd-start'.
This can be either a string or a number."
:group 'erc-identd
:type '(choice (const :tag "None" nil)
(integer :tag "Port number")
(string :tag "Port string")))
;;;###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-quickstart)
(add-hook 'erc-disconnected-hook 'erc-identd-stop))
((remove-hook 'erc-connect-pre-hook 'erc-identd-quickstart)
(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)))
(stop-process erc-identd-process)
(delete-process proc)))))
;;;###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")))
(unless port (setq port erc-identd-port))
(when (stringp port)
(setq port (string-to-number port)))
(when 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))
(defun erc-identd-quickstart (&rest ignored)
"Start the identd server with the default port.
The default port is specified by `erc-identd-port'."
(erc-identd-start))
;;;###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:
;; generated-autoload-file: "erc-loaddefs.el"
;; End:
|
