bsd-setres_id.c revision 323134 
1/*
2 * Copyright (c) 2012 Darren Tucker (dtucker at zip com au).
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 USE, DATA OR PROFITS, WHETHER IN AN
13 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
14 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
15 */
16
17#include "includes.h"
18
19#include <sys/types.h>
20
21#include <stdarg.h>
22#include <unistd.h>
23#include <string.h>
24
25#include "log.h"
26
27#if !defined(HAVE_SETRESGID) || defined(BROKEN_SETRESGID)
28int
29setresgid(gid_t rgid, gid_t egid, gid_t sgid)
30{
31	int ret = 0, saved_errno;
32
33	if (rgid != sgid) {
34		errno = ENOSYS;
35		return -1;
36	}
37#if defined(HAVE_SETREGID) && !defined(BROKEN_SETREGID)
38	if (setregid(rgid, egid) < 0) {
39		saved_errno = errno;
40		error("setregid %u: %.100s", rgid, strerror(errno));
41		errno = saved_errno;
42		ret = -1;
43	}
44#else
45	if (setegid(egid) < 0) {
46		saved_errno = errno;
47		error("setegid %u: %.100s", (u_int)egid, strerror(errno));
48		errno = saved_errno;
49		ret = -1;
50	}
51	if (setgid(rgid) < 0) {
52		saved_errno = errno;
53		error("setgid %u: %.100s", rgid, strerror(errno));
54		errno = saved_errno;
55		ret = -1;
56	}
57#endif
58	return ret;
59}
60#endif
61
62#if !defined(HAVE_SETRESUID) || defined(BROKEN_SETRESUID)
63int
64setresuid(uid_t ruid, uid_t euid, uid_t suid)
65{
66	int ret = 0, saved_errno;
67
68	if (ruid != suid) {
69		errno = ENOSYS;
70		return -1;
71	}
72#if defined(HAVE_SETREUID) && !defined(BROKEN_SETREUID)
73	if (setreuid(ruid, euid) < 0) {
74		saved_errno = errno;
75		error("setreuid %u: %.100s", ruid, strerror(errno));
76		errno = saved_errno;
77		ret = -1;
78	}
79#else
80
81# ifndef SETEUID_BREAKS_SETUID
82	if (seteuid(euid) < 0) {
83		saved_errno = errno;
84		error("seteuid %u: %.100s", euid, strerror(errno));
85		errno = saved_errno;
86		ret = -1;
87	}
88# endif
89	if (setuid(ruid) < 0) {
90		saved_errno = errno;
91		error("setuid %u: %.100s", ruid, strerror(errno));
92		errno = saved_errno;
93		ret = -1;
94	}
95#endif
96	return ret;
97}
98#endif
99