/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
│ vi: set et ft=c ts=2 sts=2 sw=2 fenc=utf-8                               :vi │
╞══════════════════════════════════════════════════════════════════════════════╡
│ Copyright 2022 Justine Alexandra Roberts Tunney                              │
│                                                                              │
│ Permission to use, copy, modify, and/or 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.                                                │
╚─────────────────────────────────────────────────────────────────────────────*/
#include "libc/calls/landlock.h"
#include "libc/intrin/strace.h"

int sys_landlock_add_rule(int, enum landlock_rule_type, const void *, uint32_t);

/**
 * Adds new rule to Landlock ruleset.
 *
 * @error ENOSYS if Landlock isn't supported
 * @error EPERM if Landlock supported but SECCOMP BPF shut it down
 * @error EOPNOTSUPP if Landlock supported but disabled at boot time
 * @error EINVAL if flags not 0, or inconsistent access in the rule,
 *     i.e. landlock_path_beneath_attr::allowed_access is not a subset
 *     of the ruleset handled accesses
 * @error ENOMSG empty allowed_access
 * @error EBADF `fd` is not a file descriptor for current thread, or
 *     member of `rule_attr` is not a file descriptor as expected
 * @error EBADFD `fd` is not a ruleset file descriptor, or a member
 *     of `rule_attr` is not the expected file descriptor type
 * @error EPERM `fd` has no write access to the underlying ruleset
 * @error EFAULT `rule_attr` inconsistency
 */
int landlock_add_rule(int fd, enum landlock_rule_type rule_type,
                      const void *rule_attr, uint32_t flags) {
  int rc;
  rc = sys_landlock_add_rule(fd, rule_type, rule_attr, flags);
  KERNTRACE("landlock_add_rule(%d, %d, %p, %#x) → %d% m", fd, rule_type,
            rule_attr, flags, rc);
  return rc;
}
