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Diffstat (limited to '')
-rw-r--r-- | lib/util/fchmodat.c | 69 |
1 files changed, 69 insertions, 0 deletions
diff --git a/lib/util/fchmodat.c b/lib/util/fchmodat.c new file mode 100644 index 0000000..39d294e --- /dev/null +++ b/lib/util/fchmodat.c @@ -0,0 +1,69 @@ +/* + * SPDX-License-Identifier: ISC + * + * Copyright (c) 2019-2020 Todd C. Miller <Todd.Miller@sudo.ws> + * + * Permission to use, copy, modify, and distribute this software for any + * purpose with or without fee is hereby granted, provided that the above + * copyright notice and this permission notice appear in all copies. + * + * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES + * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF + * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR + * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES + * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN + * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF + * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. + */ + +/* + * This is an open source non-commercial project. Dear PVS-Studio, please check it. + * PVS-Studio Static Code Analyzer for C, C++ and C#: http://www.viva64.com + */ + +#include <config.h> + +#include <sys/stat.h> + +#include <errno.h> +#include <fcntl.h> +#include <unistd.h> + +#include <sudo_compat.h> + +#ifndef HAVE_FCHMODAT +int +sudo_fchmodat(int dfd, const char *path, mode_t mode, int flag) +{ + int odfd, ret = -1; + + if (ISSET(flag, AT_SYMLINK_NOFOLLOW)) { + errno = ENOTSUP; + return -1; + } + + if (dfd == (int)AT_FDCWD) + return chmod(path, mode); + + /* Save cwd */ + if ((odfd = open(".", O_RDONLY)) == -1) + goto done; + + if (fchdir(dfd) == -1) + goto done; + + ret = chmod(path, mode); + + /* Restore cwd */ + if (fchdir(odfd) == -1) { + /* Should not happen */ + ret = -1; + } + +done: + if (odfd != -1) + close(odfd); + + return ret; +} +#endif /* HAVE_FCHMODAT */ |