compat/getpeereid.c

   1 /*
   2  * Copyright (c) 2022 Nicholas Marriott <nicholas.marriott@gmail.com>
   3  *
   4  * Permission to use, copy, modify, and distribute this software for any
   5  * purpose with or without fee is hereby granted, provided that the above
   6  * copyright notice and this permission notice appear in all copies.
   7  *
   8  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
   9  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
  10  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
  11  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
  12  * WHATSOEVER RESULTING FROM LOSS OF MIND, USE, DATA OR PROFITS, WHETHER
  13  * IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
  14  * OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  15  */
  16
  17 #include <sys/types.h>
  18 #include <sys/socket.h>
  19
  20 #include <stdio.h>
  21 #include <unistd.h>
  22
  23 #ifdef HAVE_UCRED_H
  24 #include <ucred.h>
  25 #endif
  26
  27 #include "compat.h"
  28
  29 int
  30 getpeereid(int s, uid_t *uid, gid_t *gid)
  31 {
  32 #ifdef HAVE_SO_PEERCRED
  33         struct ucred    uc;
  34         int             len = sizeof uc;
  35
  36         if (getsockopt(s, SOL_SOCKET, SO_PEERCRED, &uc, &len) == -1)
  37                 return (-1);
  38         *uid = uc.uid;
  39         *gid = uc.gid;
  40         return (0);
  41 #elif defined(HAVE_GETPEERUCRED)
  42         ucred_t *ucred = NULL;
  43
  44         if (getpeerucred(s, &ucred) == -1)
  45                 return (-1);
  46         if ((*uid = ucred_geteuid(ucred)) == -1)
  47                 return (-1);
  48         if ((*gid = ucred_getrgid(ucred)) == -1)
  49                 return (-1);
  50         ucred_free(ucred);
  51         return (0);
  52 #else
  53         *uid = geteuid();
  54         *gid = getegid();
  55         return (0);
  56 #endif
  57 }