1/* $Id: bsd-setres_id.c,v 1.1 2012/11/05 06:04:37 dtucker Exp $ */
2
3/*
4 * Copyright (c) 2012 Darren Tucker (dtucker at zip com au).
5 *
6 * Permission to use, copy, modify, and distribute this software for any
7 * purpose with or without fee is hereby granted, provided that the above
8 * copyright notice and this permission notice appear in all copies.
9 *
10 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
11 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
12 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
13 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
14 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
15 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
16 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
17 */
18
19#include "includes.h"
20
21#include <sys/types.h>
22
23#include <stdarg.h>
24#include <unistd.h>
25
26#include "log.h"
27
28#if !defined(HAVE_SETRESGID) || defined(BROKEN_SETRESGID)
29int
30setresgid(gid_t rgid, gid_t egid, gid_t sgid)
31{
32	int ret = 0, saved_errno;
33
34	if (rgid != sgid) {
35		errno = ENOSYS;
36		return -1;
37	}
38#if defined(HAVE_SETREGID) && !defined(BROKEN_SETREGID)
39	if (setregid(rgid, egid) < 0) {
40		saved_errno = errno;
41		error("setregid %u: %.100s", rgid, strerror(errno));
42		errno = saved_errno;
43		ret = -1;
44	}
45#else
46	if (setegid(egid) < 0) {
47		saved_errno = errno;
48		error("setegid %u: %.100s", (u_int)egid, strerror(errno));
49		errno = saved_errno;
50		ret = -1;
51	}
52	if (setgid(rgid) < 0) {
53		saved_errno = errno;
54		error("setgid %u: %.100s", rgid, strerror(errno));
55		errno = saved_errno;
56		ret = -1;
57	}
58#endif
59	return ret;
60}
61#endif
62
63#if !defined(HAVE_SETRESUID) || defined(BROKEN_SETRESUID)
64int
65setresuid(uid_t ruid, uid_t euid, uid_t suid)
66{
67	int ret = 0, saved_errno;
68
69	if (ruid != suid) {
70		errno = ENOSYS;
71		return -1;
72	}
73#if defined(HAVE_SETREUID) && !defined(BROKEN_SETREUID)
74	if (setreuid(ruid, euid) < 0) {
75		saved_errno = errno;
76		error("setreuid %u: %.100s", ruid, strerror(errno));
77		errno = saved_errno;
78		ret = -1;
79	}
80#else
81
82# ifndef SETEUID_BREAKS_SETUID
83	if (seteuid(euid) < 0) {
84		saved_errno = errno;
85		error("seteuid %u: %.100s", euid, strerror(errno));
86		errno = saved_errno;
87		ret = -1;
88	}
89# endif
90	if (setuid(ruid) < 0) {
91		saved_errno = errno;
92		error("setuid %u: %.100s", ruid, strerror(errno));
93		errno = saved_errno;
94		ret = -1;
95	}
96#endif
97	return ret;
98}
99#endif
100