summaryrefslogtreecommitdiff
path: root/tests/test-sethostname2.c
blob: 13e6cf7cd18774173997b8e8edc6f9f2c4a8ce70 (plain)
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) 2011-2012 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 <http://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 __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;
}