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annotate tests/test-sethostname2.c @ 40196:e63f5d3edab5

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relocatable-prog: Update documentation. * doc/relocatable-maint.texi (Supporting Relocation): Update to match the recent changes.
author Bruno Haible <bruno@clisp.org>
date Sun, 24 Feb 2019 01:49:15 +0100
parents b06060465f09
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 /*
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2 * Copyright (C) 2011-2019 Free Software Foundation, Inc.
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3 * Written by Ben Walton.
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4 *
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5 * This program is free software: you can redistribute it and/or modify
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6 * it under the terms of the GNU General Public License as published by
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7 * the Free Software Foundation; either version 3 of the License, or
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8 * (at your option) any later version.
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9 *
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10 * This program is distributed in the hope that it will be useful,
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11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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13 * GNU General Public License for more details.
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14 *
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15 * You should have received a copy of the GNU General Public License
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16 * along with this program. If not, see <https://www.gnu.org/licenses/>. */
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17
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18 #include <config.h>
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19
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20 #include <unistd.h>
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21
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22 /* for HOST_NAME_MAX */
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23 #include <limits.h>
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24 /* for strlen */
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25 #include <string.h>
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26
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27 #include <errno.h>
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28 #include <stdio.h>
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29
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30 #include "root-uid.h"
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31
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32 #include "macros.h"
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33
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34 #define TESTHOSTNAME "gnulib-hostname"
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35
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36 /* mingw and MSVC 9 lack geteuid, so setup a dummy value.
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37 On Cygwin, geteuid() may return non-zero even for user accounts with
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38 administrator privileges, so use a dummy value as well. */
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39 #if !HAVE_GETEUID || defined __CYGWIN__
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40 # define geteuid() ROOT_UID
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41 #endif
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42
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43 int
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44 main (int argc, char *argv[] _GL_UNUSED)
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45 {
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46 char origname[HOST_NAME_MAX];
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47 char newname[HOST_NAME_MAX];
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48 char longname[HOST_NAME_MAX + 2];
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49 int rcs, i;
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50
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51 /* skip the tests if we don't have root privilege. this does not
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52 consider things like CAP_SYS_ADMIN (linux) or PRIV_SYS_ADMIN
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53 (solaris), etc. systems without a working geteuid (mingw, MSVC
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54 9) will always skip this test. */
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55 if (geteuid () != ROOT_UID)
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56 {
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57 fprintf (stderr, "Skipping test: insufficient permissions.\n");
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58 return 77;
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59 }
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60
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61 /* we want to ensure we can do a get/set/get check to ensure the
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62 change is accepted. record the current name so it can be restored
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63 later */
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64 ASSERT (gethostname (origname, sizeof (origname)) == 0);
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65
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66 /* try setting a valid hostname. if it fails -1/ENOSYS, we will
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67 skip the test for long names as this is an indication we're using
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68 the stub function that doesn't do anything on this platform. */
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69 rcs = sethostname (TESTHOSTNAME, strlen (TESTHOSTNAME));
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70
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71 if (rcs != 0)
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72 {
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73 if (rcs == -1 && errno == ENOSYS)
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74 {
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75 fprintf (stderr,
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76 "Skipping test: sethostname is not really implemented.\n");
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77 return 77;
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78 }
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79 else if (rcs == -1 && errno == EPERM)
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80 {
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81 fprintf (stderr, "Skipping test: insufficient permissions.\n");
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82 return 77;
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83 }
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84 else
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85 {
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86 fprintf (stderr, "error setting valid hostname.\n");
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87 return 1;
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88 }
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89 }
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90 else
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91 {
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92 ASSERT (gethostname (newname, sizeof (newname)) == 0);
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93
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94 /* On Windows, a hostname change becomes effective only after
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95 a reboot. */
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96 #if !(defined _WIN32 || defined __CYGWIN__)
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97
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98 /* if we don't get back what we put in, there is no need to
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99 restore the original name as we will assume it was not
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100 properly changed. */
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101 if (strcmp (newname, TESTHOSTNAME) != 0)
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102 {
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103 fprintf (stderr, "set/get comparison failed.\n");
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104 return 1;
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105 }
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106 #endif
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107 }
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108
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109 /* glibc does allow setting a zero length name, so the lower bound
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110 needs no test. validate that we are constrained by
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111 HOST_NAME_MAX */
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112 for (i = 0; i < (HOST_NAME_MAX + 1); i++)
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113 longname[i] = 'a';
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114
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115 longname[i] = '\0';
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116
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117 rcs = sethostname (longname, (HOST_NAME_MAX + 1));
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118
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119 if (rcs != -1)
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120 {
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121 /* attempt to restore the original name. */
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122 ASSERT (sethostname (origname, strlen (origname)) == 0);
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123 fprintf (stderr, "setting a too long hostname succeeded.\n");
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124 return 1;
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125 }
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126
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127 /* restore the original name. */
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128 ASSERT (sethostname (origname, strlen (origname)) == 0);
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129
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130 return 0;
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131 }