| /* |
| * 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; |
| } |