gen/FreeBSD/getpeereid.c

   1 /*
   2  * Copyright (c) 2001 Dima Dorfman.
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  *
  14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  15  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  17  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  18  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  19  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  20  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  21  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  22  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  23  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  24  * SUCH DAMAGE.
  25  */
  26
  27 #include <sys/cdefs.h>
  28 __FBSDID("$FreeBSD: src/lib/libc/gen/getpeereid.c,v 1.6 2002/12/16 13:42:13 maxim Exp $");
  29
  30 #include <sys/param.h>
  31 #include <sys/socket.h>
  32 #include <sys/ucred.h>
  33 #include <sys/un.h>
  34
  35 #include <errno.h>
  36 #include <unistd.h>
  37
  38 int
  39 getpeereid(int s, uid_t *euid, gid_t *egid)
  40 {
  41         struct xucred xuc;
  42         socklen_t xuclen;
  43         int error;
  44
  45         xuclen = sizeof(xuc);
  46         error = getsockopt(s, 0, LOCAL_PEERCRED, &xuc, &xuclen);
  47         if (error != 0)
  48                 return (error);
  49         if (xuc.cr_version != XUCRED_VERSION) {
  50                 errno = EINVAL;
  51                 return (-1);
  52         }
  53         *euid = xuc.cr_uid;
  54         *egid = xuc.cr_gid;
  55         return (0);
  56 }