getpeereid.c revision 1.1.1.1 
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
22#ifdef HAVE_UCRED_H
23#include <ucred.h>
24#endif
25
26#include "compat.h"
27
28int
29getpeereid(int s, uid_t *uid, gid_t *gid)
30{
31#ifdef HAVE_SO_PEERCRED
32	struct ucred	uc;
33	int		len = sizeof uc;
34
35	if (getsockopt(s, SOL_SOCKET, SO_PEERCRED, &uc, &len) == -1)
36		return (-1);
37	*uid = uc.uid;
38	*gid = uc.gid;
39	return (0);
40#elif defined(HAVE_GETPEERUCRED)
41        ucred_t *ucred = NULL;
42
43        if (getpeerucred(s, &ucred) == -1)
44                return (-1);
45        if ((*uid = ucred_geteuid(ucred)) == -1)
46                return (-1);
47        if ((*gid = ucred_getrgid(ucred)) == -1)
48                return (-1);
49        ucred_free(ucred);
50        return (0);
51#else
52	return (getuid());
53#endif
54}
55