1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
|
/*
* Copyright (C) 2011-2020 Free Software Foundation, Inc.
* Written by Ben Walton.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <https://www.gnu.org/licenses/>. */
#include <config.h>
#include <unistd.h>
/* for HOST_NAME_MAX */
#include <limits.h>
/* for strlen */
#include <string.h>
#include <errno.h>
#include <stdio.h>
#include "root-uid.h"
#include "macros.h"
#define TESTHOSTNAME "gnulib-hostname"
/* mingw and MSVC 9 lack geteuid, so setup a dummy value.
On Cygwin, geteuid() may return non-zero even for user accounts with
administrator privileges, so use a dummy value as well. */
#if !HAVE_GETEUID || defined __CYGWIN__
# define geteuid() ROOT_UID
#endif
int
main (int argc, char *argv[] _GL_UNUSED)
{
char origname[HOST_NAME_MAX];
char newname[HOST_NAME_MAX];
char longname[HOST_NAME_MAX + 2];
int rcs, i;
/* skip the tests if we don't have root privilege. this does not
consider things like CAP_SYS_ADMIN (linux) or PRIV_SYS_ADMIN
(solaris), etc. systems without a working geteuid (mingw, MSVC
9) will always skip this test. */
if (geteuid () != ROOT_UID)
{
fprintf (stderr, "Skipping test: insufficient permissions.\n");
return 77;
}
/* we want to ensure we can do a get/set/get check to ensure the
change is accepted. record the current name so it can be restored
later */
ASSERT (gethostname (origname, sizeof (origname)) == 0);
/* try setting a valid hostname. if it fails -1/ENOSYS, we will
skip the test for long names as this is an indication we're using
the stub function that doesn't do anything on this platform. */
rcs = sethostname (TESTHOSTNAME, strlen (TESTHOSTNAME));
if (rcs != 0)
{
if (rcs == -1 && errno == ENOSYS)
{
fprintf (stderr,
"Skipping test: sethostname is not really implemented.\n");
return 77;
}
else if (rcs == -1 && errno == EPERM)
{
fprintf (stderr, "Skipping test: insufficient permissions.\n");
return 77;
}
else
{
fprintf (stderr, "error setting valid hostname.\n");
return 1;
}
}
else
{
ASSERT (gethostname (newname, sizeof (newname)) == 0);
/* On Windows, a hostname change becomes effective only after
a reboot. */
#if !(defined _WIN32 || defined __CYGWIN__)
/* if we don't get back what we put in, there is no need to
restore the original name as we will assume it was not
properly changed. */
if (strcmp (newname, TESTHOSTNAME) != 0)
{
fprintf (stderr, "set/get comparison failed.\n");
return 1;
}
#endif
}
/* glibc does allow setting a zero length name, so the lower bound
needs no test. validate that we are constrained by
HOST_NAME_MAX */
for (i = 0; i < (HOST_NAME_MAX + 1); i++)
longname[i] = 'a';
longname[i] = '\0';
rcs = sethostname (longname, (HOST_NAME_MAX + 1));
if (rcs != -1)
{
/* attempt to restore the original name. */
ASSERT (sethostname (origname, strlen (origname)) == 0);
fprintf (stderr, "setting a too long hostname succeeded.\n");
return 1;
}
/* restore the original name. */
ASSERT (sethostname (origname, strlen (origname)) == 0);
return 0;
}
|
