bsd-setres_id.c revision 262566 
1/* $Id: bsd-setres_id.c,v 1.2 2013/12/07 21:23:09 djm 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#include <string.h>
26
27#include "log.h"
28
29#if !defined(HAVE_SETRESGID) || defined(BROKEN_SETRESGID)
30int
31setresgid(gid_t rgid, gid_t egid, gid_t sgid)
32{
33	int ret = 0, saved_errno;
34
35	if (rgid != sgid) {
36		errno = ENOSYS;
37		return -1;
38	}
39#if defined(HAVE_SETREGID) && !defined(BROKEN_SETREGID)
40	if (setregid(rgid, egid) < 0) {
41		saved_errno = errno;
42		error("setregid %u: %.100s", rgid, strerror(errno));
43		errno = saved_errno;
44		ret = -1;
45	}
46#else
47	if (setegid(egid) < 0) {
48		saved_errno = errno;
49		error("setegid %u: %.100s", (u_int)egid, strerror(errno));
50		errno = saved_errno;
51		ret = -1;
52	}
53	if (setgid(rgid) < 0) {
54		saved_errno = errno;
55		error("setgid %u: %.100s", rgid, strerror(errno));
56		errno = saved_errno;
57		ret = -1;
58	}
59#endif
60	return ret;
61}
62#endif
63
64#if !defined(HAVE_SETRESUID) || defined(BROKEN_SETRESUID)
65int
66setresuid(uid_t ruid, uid_t euid, uid_t suid)
67{
68	int ret = 0, saved_errno;
69
70	if (ruid != suid) {
71		errno = ENOSYS;
72		return -1;
73	}
74#if defined(HAVE_SETREUID) && !defined(BROKEN_SETREUID)
75	if (setreuid(ruid, euid) < 0) {
76		saved_errno = errno;
77		error("setreuid %u: %.100s", ruid, strerror(errno));
78		errno = saved_errno;
79		ret = -1;
80	}
81#else
82
83# ifndef SETEUID_BREAKS_SETUID
84	if (seteuid(euid) < 0) {
85		saved_errno = errno;
86		error("seteuid %u: %.100s", euid, strerror(errno));
87		errno = saved_errno;
88		ret = -1;
89	}
90# endif
91	if (setuid(ruid) < 0) {
92		saved_errno = errno;
93		error("setuid %u: %.100s", ruid, strerror(errno));
94		errno = saved_errno;
95		ret = -1;
96	}
97#endif
98	return ret;
99}
100#endif
101