unix-lw.lisp

   1 ;;; -*- Mode: LISP; Syntax: COMMON-LISP; Package: HUNCHENTOOT; Base: 10 -*-
   2 ;;; $Header: /usr/local/cvsrep/hunchentoot/unix-lw.lisp,v 1.5 2008/02/13 16:02:19 edi Exp $
   3
   4 ;;; Copyright (c) 2004-2008, Dr. Edmund Weitz.  All rights reserved.
   5
   6 ;;; Redistribution and use in source and binary forms, with or without
   7 ;;; modification, are permitted provided that the following conditions
   8 ;;; are met:
   9
  10 ;;;   * Redistributions of source code must retain the above copyright
  11 ;;;     notice, this list of conditions and the following disclaimer.
  12
  13 ;;;   * Redistributions in binary form must reproduce the above
  14 ;;;     copyright notice, this list of conditions and the following
  15 ;;;     disclaimer in the documentation and/or other materials
  16 ;;;     provided with the distribution.
  17
  18 ;;; THIS SOFTWARE IS PROVIDED BY THE AUTHOR 'AS IS' AND ANY EXPRESSED
  19 ;;; OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
  20 ;;; WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  21 ;;; ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
  22 ;;; DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  23 ;;; DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
  24 ;;; GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  25 ;;; INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
  26 ;;; WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
  27 ;;; NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  28 ;;; SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  29
  30 (in-package :hunchentoot)
  31
  32 (fli:define-foreign-function (%setuid "setuid")
  33     ((uid :int))
  34   :result-type :int)
  35
  36 (defun setuid (uid)
  37   "Sets the effective user ID of the current process to UID - see
  38 setuid\(2)."
  39   (unless (zerop (%setuid uid))
  40     (parameter-error "setuid failed: ~A" (lw:get-unix-error (lw:errno-value)))))
  41
  42 (fli:define-foreign-function (%setgid "setgid")
  43     ((gid :int))
  44   :result-type :int)
  45
  46 (defun setgid (gid)
  47   "Sets the effective group ID of the current process to GID -
  48 see setgid\(2)."
  49   (unless (zerop (%setgid gid))
  50     (parameter-error "setgid failed: ~A" (lw:get-unix-error (lw:errno-value)))))
  51
  52 (fli:define-c-struct passwd
  53   (name (:pointer :char))
  54   (passwd (:pointer :char))
  55   (uid :int)
  56   (gid :int)
  57   (gecos (:pointer :char))
  58   (dir (:pointer :char))
  59   (shell (:pointer :char)))
  60
  61 (fli:define-foreign-function (getpwnam "getpwnam")
  62     ((name (:reference-pass :ef-mb-string)))
  63   :result-type (:pointer passwd))
  64
  65 (defun get-uid-from-name (name)
  66   "Returns the UID for the user named NAME."
  67   (let ((passwd (getpwnam name)))
  68     (when (fli:null-pointer-p passwd)
  69       (let ((errno (lw:errno-value)))
  70         (cond ((zerop errno)
  71                (parameter-error "User ~S not found." name))
  72               (t (parameter-error "getpwnam failed: ~A" (lw:get-unix-error errno))))))
  73     (fli:foreign-slot-value passwd 'uid)))
  74
  75 (fli:define-c-struct group
  76   (name (:pointer :char))
  77   (passwd (:pointer :char))
  78   (gid :int)
  79   (mem (:pointer (:pointer :char))))
  80
  81 (fli:define-foreign-function (getgrnam "getgrnam")
  82     ((name (:reference-pass :ef-mb-string)))
  83   :result-type (:pointer group))
  84
  85 (defun get-gid-from-name (name)
  86   "Returns the GID for the group named NAME."
  87   (let ((group (getgrnam name)))
  88     (when (fli:null-pointer-p group)
  89       (let ((errno (lw:errno-value)))
  90         (cond ((zerop errno)
  91                (parameter-error "Group ~S not found." name))
  92               (t (parameter-error "getgrnam failed: ~A" (lw:get-unix-error errno))))))
  93     (fli:foreign-slot-value group 'gid)))