capsicum-rights.h

#ifndef __CAPSICUM_RIGHTS_H__
#define __CAPSICUM_RIGHTS_H__

#ifdef __cplusplus
extern "C" {
#endif

#ifdef __FreeBSD__
#include <sys/param.h>
#if __FreeBSD_version >= 1100014 || \
    (__FreeBSD_version >= 1001511 && __FreeBSD_version < 1100000)
#include <sys/capsicum.h>
#else
#include <sys/capability.h>
#endif
#endif

#ifdef __linux__
#include <linux/capsicum.h>
#endif

#ifdef __cplusplus
}
#endif

#ifndef CAP_RIGHTS_VERSION
/************************************************************
 * Capsicum compatibility layer: implement new (FreeBSD10.x)
 * rights manipulation API in terms of original (FreeBSD9.x)
 * functionality.
 ************************************************************/
#include <stdarg.h>
#include <stdbool.h>

/* Rights manipulation macros/functions.
 * Note that these use variadic macros, available in C99 / C++11 (and
 * also in earlier gcc versions).
 */
#define cap_rights_init(rights, ...)   _cap_rights_init((rights), __VA_ARGS__, 0ULL)
#define cap_rights_set(rights, ...)    _cap_rights_set((rights), __VA_ARGS__, 0ULL)
#define cap_rights_clear(rights, ...)  _cap_rights_clear((rights), __VA_ARGS__, 0ULL)
#define cap_rights_is_set(rights, ...) _cap_rights_is_set((rights), __VA_ARGS__, 0ULL)

inline cap_rights_t* _cap_rights_init(cap_rights_t *rights, ...) {
  va_list ap;
  cap_rights_t right;
  *rights = 0;
  va_start(ap, rights);
  while (true) {
    right = va_arg(ap, cap_rights_t);
    *rights |= right;
    if (right == 0) break;
  }
  va_end(ap);
  return rights;
}

inline cap_rights_t* _cap_rights_set(cap_rights_t *rights, ...) {
  va_list ap;
  cap_rights_t right;
  va_start(ap, rights);
  while (true) {
    right = va_arg(ap, cap_rights_t);
    *rights |= right;
    if (right == 0) break;
  }
  va_end(ap);
  return rights;
}

inline cap_rights_t* _cap_rights_clear(cap_rights_t *rights, ...) {
  va_list ap;
  cap_rights_t right;
  va_start(ap, rights);
  while (true) {
    right = va_arg(ap, cap_rights_t);
    *rights &= ~right;
    if (right == 0) break;
  }
  va_end(ap);
  return rights;
}

inline bool _cap_rights_is_set(const cap_rights_t *rights, ...) {
  va_list ap;
  cap_rights_t right;
  cap_rights_t accumulated = 0;
  va_start(ap, rights);
  while (true) {
    right = va_arg(ap, cap_rights_t);
    accumulated |= right;
    if (right == 0) break;
  }
  va_end(ap);
  return (accumulated & *rights) == accumulated;
}

inline bool _cap_rights_is_valid(const cap_rights_t *rights) {
  return true;
}

inline cap_rights_t* cap_rights_merge(cap_rights_t *dst, const cap_rights_t *src) {
  *dst |= *src;
  return dst;
}

inline cap_rights_t* cap_rights_remove(cap_rights_t *dst, const cap_rights_t *src) {
  *dst &= ~(*src);
  return dst;
}

inline bool cap_rights_contains(const cap_rights_t *big, const cap_rights_t *little) {
  return ((*big) & (*little)) == (*little);
}

#endif  /* old/new style rights manipulation */

#endif /*__CAPSICUM_RIGHTS_H__*/