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    1: /*
    2:  * Copyright (c) 2011 Todd C. Miller <Todd.Miller@courtesan.com>
    3:  *
    4:  * Permission to use, copy, modify, and distribute this software for any
    5:  * purpose with or without fee is hereby granted, provided that the above
    6:  * copyright notice and this permission notice appear in all copies.
    7:  *
    8:  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
    9:  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
   10:  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
   11:  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
   12:  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
   13:  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
   14:  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
   15:  * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
   16:  * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   17:  */
   18: 
   19: #include <config.h>
   20: 
   21: #include <sys/types.h>
   22: #include <stdio.h>
   23: #ifdef STDC_HEADERS
   24: # include <stdlib.h>
   25: # include <stddef.h>
   26: #else
   27: # ifdef HAVE_STDLIB_H
   28: #  include <stdlib.h>
   29: # endif
   30: #endif /* STDC_HEADERS */
   31: #ifdef HAVE_UNISTD_H
   32: # include <unistd.h>
   33: #endif /* HAVE_UNISTD_H */
   34: #include <errno.h>
   35: #include <grp.h>
   36: #include <limits.h>
   37: 
   38: #include "missing.h"
   39: 
   40: int
   41: sudo_setgroups(int ngids, const GETGROUPS_T *gids)
   42: {
   43:     int maxgids, rval;
   44: 
   45:     rval = setgroups(ngids, gids);
   46:     if (rval == -1 && errno == EINVAL) {
   47: 	/* Too many groups, try again with fewer. */
   48: #if defined(HAVE_SYSCONF) && defined(_SC_NGROUPS_MAX)
   49: 	maxgids = (int)sysconf(_SC_NGROUPS_MAX);
   50: 	if (maxgids == -1)
   51: #endif
   52: 	    maxgids = NGROUPS_MAX;
   53: 	if (ngids > maxgids)
   54: 	    rval = setgroups(maxgids, gids);
   55:     }
   56:     return rval;
   57: }