protocols/dns-client/dns-lookup.lisp

   1 ;; -*- Mode: Lisp; Syntax: ANSI-Common-Lisp -*-
   2
   3 ;;   Copyright (C) 2006, 2007 Stelian Ionescu
   4 ;;
   5 ;;   This code is free software; you can redistribute it and/or
   6 ;;   modify it under the terms of the version 2.1 of
   7 ;;   the GNU Lesser General Public License as published by
   8 ;;   the Free Software Foundation, as clarified by the
   9 ;;   preamble found here:
  10 ;;       http://opensource.franz.com/preamble.html
  11 ;;
  12 ;;   This program is distributed in the hope that it will be useful,
  13 ;;   but WITHOUT ANY WARRANTY; without even the implied warranty of
  14 ;;   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15 ;;   GNU General Public License for more details.
  16 ;;
  17 ;;   You should have received a copy of the GNU Lesser General
  18 ;;   Public License along with this library; if not, write to the
  19 ;;   Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
  20 ;;   Boston, MA 02110-1301, USA
  21
  22 (in-package :net.sockets)
  23
  24 (defvar *hosts-file* "/etc/hosts")
  25
  26 (defgeneric dns-lookup-host (host &key ipv6))
  27
  28 (defmethod dns-lookup-host ((host string) &key (ipv6 *ipv6*))
  29   (or (search-etc-hosts-name *hosts-file* host ipv6)
  30       (dns-query host :type :a)))
  31
  32 (defun dns-lookup-host-ip (vector ipv6)
  33   (or (search-etc-hosts-ip *hosts-file* vector ipv6)
  34       (dns-query vector :type :ptr)))
  35
  36 (defmethod dns-lookup-host ((host ipv4addr) &key (ipv6 *ipv6*))
  37   (dns-lookup-host-ip (name host) ipv6))
  38
  39 (defmethod dns-lookup-host ((host ipv6addr) &key (ipv6 *ipv6*))
  40   (dns-lookup-host-ip (name host) ipv6))
  41
  42 (defmethod dns-lookup-host (host &key (ipv6 *ipv6*))
  43   (etypecase host
  44     (simple-array (dns-lookup-host-ip host ipv6))))