mdw@git.distorted.org.uk Git - zone/blob - sys.lisp

   1 ;;; -*-lisp-*-
   2 ;;;
   3 ;;; System-specific functions
   4 ;;;
   5 ;;; (c) 2008 Straylight/Edgeware
   6 ;;;
   7
   8 ;;;----- Licensing notice ---------------------------------------------------
   9 ;;;
  10 ;;; This program 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 of the License, or
  13 ;;; (at your option) any later version.
  14 ;;;
  15 ;;; This program 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 this program; if not, write to the Free Software Foundation,
  22 ;;; Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  23
  24 (cl:in-package #:net)
  25
  26 ;;;--------------------------------------------------------------------------
  27 ;;; Functions provided.
  28
  29 #+ecl
  30 (cffi:defcfun gethostname :int
  31   (name :pointer)
  32   (len :uint))
  33
  34 (export 'gethostname)
  35 (defun gethostname ()
  36   "Return the hostname (not necessarily canonical) of the current host."
  37
  38   #+cmu
  39   (unix:unix-gethostname)
  40
  41   #+sbcl
  42   (sb-unix:unix-gethostname)
  43
  44   #+clisp
  45   (unix:get-host-name)
  46
  47   #+ecl
  48   (cffi:with-foreign-pointer-as-string (buffer 256 len)
  49     (let ((rc (gethostname buffer len)))
  50       (unless (zerop rc)
  51         (error "gethostname(2) failed (rc = ~A)." rc))))
  52
  53   #-(or cmu sbcl clisp ecl)
  54   "<unknown-host>")
  55
  56 (export 'resolve-hostname)
  57 (defun resolve-hostname (name)
  58   "Resolve a hostname to an IP address using the DNS, or return nil."
  59
  60   #+cmu
  61   (let ((he (ext:lookup-host-entry name)))
  62     (and he (ext:host-entry-addr he)))
  63
  64   #+sbcl
  65   (handler-case
  66       (let* ((he (sb-bsd-sockets:get-host-by-name name))
  67              (addr (sb-bsd-sockets:host-ent-address he)))
  68         (reduce (lambda (acc byte) (logior (ash acc 8) byte)) addr))
  69     (sb-bsd-sockets:name-service-error () nil))
  70
  71   #+clisp
  72   (let ((he (ext:resolve-host-ipaddr name)))
  73     (and he (string-ipaddr (car (ext:hostent-addr-list he)))))
  74
  75   #+ecl
  76   (nth-value 2 (ext:lookup-host-entry name))
  77
  78   #-(or cmu sbcl clisp ecl)
  79   nil)
  80
  81 (export 'canonify-hostname)
  82 (defun canonify-hostname (name)
  83   "Resolve a hostname to canonical form using the DNS, or return nil."
  84
  85   #+cmu
  86   (let ((he (ext:lookup-host-entry name)))
  87     (and he (ext:host-entry-name he)))
  88
  89   #+sbcl
  90   (handler-case
  91       (let ((he (sb-bsd-sockets:get-host-by-name name)))
  92         (sb-bsd-sockets:host-ent-name he))
  93     (sb-bsd-sockets:name-service-error () nil))
  94
  95   #+clisp
  96   (let ((he (ext:resolve-host-ipaddr name)))
  97     (and he (ext:hostent-name he)))
  98
  99   #+ecl
 100   (nth-value 0 (ext:lookup-host-entry name))
 101
 102   #-(or cmu sbcl clisp ecl)
 103   name)
 104
 105 ;;;----- That's all, folks --------------------------------------------------