| 1 | /* GLIB - Library of useful routines for C programming |
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| 2 | * |
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| 3 | * Copyright (C) 2020 Red Hat, Inc. |
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| 4 | * |
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| 5 | * Author: Jakub Jelen <jjelen@redhat.com> |
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| 6 | * |
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| 7 | * This library is free software; you can redistribute it and/or |
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| 8 | * modify it under the terms of the GNU Lesser General Public |
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| 9 | * License as published by the Free Software Foundation; either |
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| 10 | * version 2.1 of the License, or (at your option) any later version. |
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| 11 | * |
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| 12 | * This library is distributed in the hope that it will be useful, |
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| 13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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| 15 | * Lesser General Public License for more details. |
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| 16 | * |
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| 17 | * You should have received a copy of the GNU Lesser General |
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| 18 | * Public License along with this library; if not, see <http://www.gnu.org/licenses/>. |
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| 19 | */ |
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| 20 | |
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| 21 | #include <dlfcn.h> |
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| 22 | #include <pwd.h> |
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| 23 | #include <sys/types.h> |
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| 24 | #include <unistd.h> |
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| 25 | |
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| 26 | static struct passwd my_pw; |
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| 27 | |
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| 28 | /* This is used in gutils.c used to make sure utility functions |
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| 29 | * handling user information do not crash on bad data (for example |
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| 30 | * caused by getpwuid returning some NULL elements. |
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| 31 | */ |
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| 32 | struct passwd * |
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| 33 | getpwuid (uid_t uid) |
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| 34 | { |
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| 35 | static struct passwd *(*real_getpwuid) (uid_t); |
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| 36 | struct passwd *pw; |
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| 37 | |
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| 38 | if (real_getpwuid == NULL) |
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| 39 | real_getpwuid = dlsym (RTLD_NEXT, name: "getpwuid" ); |
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| 40 | |
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| 41 | pw = real_getpwuid (uid); |
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| 42 | my_pw = *pw; |
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| 43 | my_pw.pw_name = NULL; |
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| 44 | return &my_pw; |
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| 45 | } |
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| 46 | |
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