1 files changed, 52 insertions, 0 deletions
diff --git a/lib/selinux-at.h b/lib/selinux-at.h
new file mode 100644
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--- /dev/null
+++ b/lib/selinux-at.h
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+/* Prototypes for openat-style fd-relative SELinux functions
+   Copyright (C) 2007, 2009-2020 Free Software Foundation, Inc.
+
+   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 <selinux/selinux.h>
+#include <selinux/context.h>
+
+/* These are the dir-fd-relative variants of the functions without the
+   "at" suffix.  For example, getfileconat (AT_FDCWD, file, &c) is usually
+   equivalent to getfilecon (file, &c).  The emulation is accomplished
+   by first attempting getfilecon ("/proc/self/fd/DIR_FD/FILE", &c).
+   Failing that, simulate it via save_cwd/fchdir/getfilecon/restore_cwd.
+   If either the save_cwd or the restore_cwd fails (relatively unlikely),
+   then give a diagnostic and exit nonzero.  */
+
+/* dir-fd-relative getfilecon.  Set *CON to the SELinux security context
+   of the file specified by DIR_FD and FILE and return the length of *CON.
+   DIR_FD and FILE are interpreted as for fstatat[*].  A non-NULL *CON
+   must be freed with freecon.  Upon error, set *CON to NULL, set errno
+   and return -1.
+   [*] with flags=0 here, with flags=AT_SYMLINK_NOFOLLOW for lgetfileconat  */
+int  getfileconat (int dir_fd, char const *file, security_context_t *con);
+
+/* dir-fd-relative lgetfilecon.  This function is just like getfileconat,
+   except when DIR_FD and FILE specify a symlink:  lgetfileconat operates on
+   the symlink, while getfileconat operates on the referent of the symlink.  */
+int lgetfileconat (int dir_fd, char const *file, security_context_t *con);
+
+/* dir-fd-relative setfilecon.  Set the SELinux security context of
+   the file specified by DIR_FD and FILE to CON.  DIR_FD and FILE are
+   interpreted as for fstatat[*].  Upon success, return 0.
+   Otherwise, return -1 and set errno.  */
+int  setfileconat (int dir_fd, char const *file, security_context_t con);
+
+/* dir-fd-relative lsetfilecon.  This function is just like setfileconat,
+   except that rather than dereferencing a symlink, this function affects it. */
+/* dir-fd-relative lsetfilecon.  This function is just like setfileconat,
+   except when DIR_FD and FILE specify a symlink:  lsetfileconat operates on
+   the symlink, while setfileconat operates on the referent of the symlink.  */
+int lsetfileconat (int dir_fd, char const *file, security_context_t con);