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119 lines
4.1 KiB
EmacsLisp
119 lines
4.1 KiB
EmacsLisp
;;; erc-identd.el --- RFC1413 (identd authentication protocol) server -*- lexical-binding: t; -*-
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;; Copyright (C) 2003, 2006-2024 Free Software Foundation, Inc.
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;; Author: John Wiegley <johnw@gnu.org>
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;; Maintainer: Amin Bandali <bandali@gnu.org>, F. Jason Park <jp@neverwas.me>
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;; Keywords: comm
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;; This file is part of GNU Emacs.
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;; GNU Emacs is free software: you can redistribute it and/or modify
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;; it under the terms of the GNU General Public License as published by
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;; the Free Software Foundation, either version 3 of the License, or
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;; (at your option) any later version.
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;; GNU Emacs is distributed in the hope that it will be useful,
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;; but WITHOUT ANY WARRANTY; without even the implied warranty of
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;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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;; GNU General Public License for more details.
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;; You should have received a copy of the GNU General Public License
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;; along with GNU Emacs. If not, see <https://www.gnu.org/licenses/>.
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;;; Commentary:
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;; This module allows you to run a local identd server on port 8113.
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;; You will need to set up DNAT to bind 113->8113, or use a proxy.
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;; To use this module, add identd to `erc-modules' and run
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;; `erc-update-modules'.
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;; Here is an example /etc/inetd.conf rule that forwards identd
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;; traffic to port 8113. You will need simpleproxy installed for it
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;; to work.
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;; 113 stream tcp nowait nobody /usr/sbin/tcpd /usr/bin/simpleproxy simpleproxy -i -R 127.0.0.1:8113
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;;; Code:
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(require 'erc)
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(defvar erc-identd-process nil)
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(defgroup erc-identd nil
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"Run a local identd server."
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:group 'erc)
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(defcustom erc-identd-port 8113
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"Port to run the identd server on.
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This can be overridden by specifying an argument for
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`erc-identd-start'.
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This can be either a string or a number."
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:type '(choice (const :tag "None" nil)
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(integer :tag "Port number")
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(string :tag "Port string")))
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;;;###autoload(autoload 'erc-identd-mode "erc-identd")
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(define-erc-module identd nil
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"This mode launches an identd server on port 8113."
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((add-hook 'erc-connect-pre-hook #'erc-identd-quickstart)
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(add-hook 'erc-disconnected-hook #'erc-identd-stop))
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((remove-hook 'erc-connect-pre-hook #'erc-identd-quickstart)
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(remove-hook 'erc-disconnected-hook #'erc-identd-stop)))
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(defun erc-identd-filter (proc string)
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"This filter implements RFC1413 (identd authentication protocol)."
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(let ((erc-identd-process proc))
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(when (string-match "\\([0-9]+\\)\\s-*,\\s-*\\([0-9]+\\)" string)
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(let ((port-on-server (match-string 1 string))
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(port-on-client (match-string 2 string)))
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(send-string erc-identd-process
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(format "%s, %s : USERID : %s : %s\n"
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port-on-server port-on-client
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system-type (user-login-name)))
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(stop-process erc-identd-process)
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(delete-process proc)))))
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;;;###autoload
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(defun erc-identd-start (&optional port)
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"Start an identd server listening to port 8113.
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Port 113 (auth) will need to be redirected to port 8113 on your
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machine -- using iptables, or a program like redir which can be
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run from inetd. The idea is to provide a simple identd server
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when you need one, without having to install one globally on your
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system."
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(interactive (list (read-string "Serve identd requests on port: " "8113")))
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(unless port (setq port erc-identd-port))
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(when (stringp port)
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(setq port (string-to-number port)))
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(when erc-identd-process
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(delete-process erc-identd-process))
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(setq erc-identd-process
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(make-network-process :name "identd"
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:buffer nil
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:host 'local :service port
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:server t :noquery t :nowait t
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:filter #'erc-identd-filter))
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(set-process-query-on-exit-flag erc-identd-process nil))
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(defun erc-identd-quickstart (&rest _ignored)
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"Start the identd server with the default port.
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The default port is specified by `erc-identd-port'."
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(erc-identd-start))
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;;;###autoload
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(defun erc-identd-stop (&rest _ignore)
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(interactive)
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(when erc-identd-process
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(delete-process erc-identd-process)
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(setq erc-identd-process nil)))
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(provide 'erc-identd)
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;;; erc-identd.el ends here
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;;
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;; Local Variables:
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;; generated-autoload-file: "erc-loaddefs.el"
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;; End:
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