cap_flag.c
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- /*
- * $Id: cap_flag.c,v 1.2 1999/09/07 23:14:19 macgyver Exp $
- *
- * Copyright (c) 1997-8 Andrew G. Morgan <morgan@linux.kernel.org>
- *
- * See end of file for Log.
- *
- * This file deals with flipping of capabilities on internal
- * capability sets as specified by POSIX.1e (formerlly, POSIX 6).
- */
- #include "libcap.h"
- /*
- * Return the state of a specified capability flag. The state is
- * returned as the contents of *raised. The capability is from one of
- * the sets stored in cap_d as specified by set and value
- */
- int cap_get_flag(cap_t cap_d, cap_value_t value, cap_flag_t set,
- cap_flag_value_t *raised)
- {
- /*
- * Do we have a set and a place to store its value?
- * Is it a known capability?
- */
- if (raised && good_cap_t(cap_d) && value >= 0 && value < __CAP_BITS
- && set >= 0 && set < NUMBER_OF_CAP_SETS) {
- __cap_s *cap_p = (__cap_s *) (set*CAP_SET_SIZE
- + (__u8 *) &cap_d->set);
- *raised = isset_cap(cap_p,value) ? CAP_SET:CAP_CLEAR;
- return 0;
- } else {
- _cap_debug("invalid arguments");
- errno = EINVAL;
- return -1;
- }
- }
- /*
- * raise/lower a selection of capabilities
- */
- int cap_set_flag(cap_t cap_d, cap_flag_t set,
- int no_values, cap_value_t *array_values,
- cap_flag_value_t raise)
- {
- /*
- * Do we have a set and a place to store its value?
- * Is it a known capability?
- */
- if (good_cap_t(cap_d) && no_values > 0 && no_values <= __CAP_BITS
- && (set >= 0) && (set < NUMBER_OF_CAP_SETS)
- && (raise == CAP_SET || raise == CAP_CLEAR) ) {
- int i;
- for (i=0; i<no_values; ++i) {
- if (array_values[i] < 0 || array_values[i] >= __CAP_BITS) {
- _cap_debug("weird capability (%d) - skipped", array_values[i]);
- } else {
- int value = array_values[i];
- __cap_s *cap_p = (__cap_s *) (set*CAP_SET_SIZE
- + (__u8 *) &cap_d->set);
- if (raise == CAP_SET) {
- cap_p->raise_cap(value);
- } else {
- cap_p->lower_cap(value);
- }
- }
- }
- return 0;
- } else {
- _cap_debug("invalid arguments");
- errno = EINVAL;
- return -1;
- }
- }
- /*
- * Reset the capability to be empty (nothing raised)
- */
- int cap_clear(cap_t cap_d)
- {
- if (good_cap_t(cap_d)) {
- memset(&(cap_d->set), 0, sizeof(cap_d->set));
- return 0;
- } else {
- _cap_debug("invalid pointer");
- errno = EINVAL;
- return -1;
- }
- }
- /*
- * $Log: cap_flag.c,v $
- * Revision 1.2 1999/09/07 23:14:19 macgyver
- * Updated capabilities library and model.
- *
- * Revision 1.1.1.1 1999/04/17 22:16:31 morgan
- * release 1.0 of libcap
- *
- * Revision 1.4 1998/09/20 23:07:59 morgan
- * fixed lower bound check on 'set'.
- *
- * Revision 1.3 1998/05/24 22:54:09 morgan
- * updated for 2.1.104
- *
- * Revision 1.2 1997/04/28 00:57:11 morgan
- * fixes and zefram's patches
- *
- * Revision 1.1 1997/04/21 04:32:52 morgan
- * Initial revision
- *
- */