1 /*
   2  * Copyright (c) 1991, 1993
   3  *      The Regents of the University of California.  All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  * 3. All advertising materials mentioning features or use of this software
  14  *    must display the following acknowledgement:
  15  *      This product includes software developed by the University of
  16  *      California, Berkeley and its contributors.
  17  * 4. Neither the name of the University nor the names of its contributors
  18  *    may be used to endorse or promote products derived from this software
  19  *    without specific prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  31  * SUCH DAMAGE.
  32  */
  33 
  34 #include "includes.h"
  35 
  36 #ifndef HAVE_GETGROUPLIST
  37 
  38 #if defined(LIBC_SCCS) && !defined(lint)
  39 static char rcsid[] = "$OpenBSD: getgrouplist.c,v 1.7 1997/08/19 19:13:27 deraadt Exp $";
  40 #endif /* LIBC_SCCS and not lint */
  41 
  42 /*
  43  * get credential
  44  */
  45 #include <sys/types.h>
  46 #include <string.h>
  47 #include <grp.h>
  48 
  49 int
  50 getgrouplist(uname, agroup, groups, grpcnt)
  51         const char *uname;
  52         gid_t agroup;
  53         register gid_t *groups;
  54         int *grpcnt;
  55 {
  56         register struct group *grp;
  57         register int i, ngroups;
  58         int ret, maxgroups;
  59         int bail;
  60 
  61         ret = 0;
  62         ngroups = 0;
  63         maxgroups = *grpcnt;
  64 
  65         /*
  66          * install primary group
  67          */
  68         if (ngroups >= maxgroups) {
  69                 *grpcnt = ngroups;
  70                 return (-1);
  71         }
  72         groups[ngroups++] = agroup;
  73 
  74         /*
  75          * Scan the group file to find additional groups.
  76          */
  77         setgrent();
  78         while ((grp = getgrent())) {
  79                 if (grp->gr_gid == agroup)
  80                         continue;
  81                 for (bail = 0, i = 0; bail == 0 && i < ngroups; i++)
  82                         if (groups[i] == grp->gr_gid)
  83                                 bail = 1;
  84                 if (bail)
  85                         continue;
  86                 for (i = 0; grp->gr_mem[i]; i++) {
  87                         if (!strcmp(grp->gr_mem[i], uname)) {
  88                                 if (ngroups >= maxgroups) {
  89                                         ret = -1;
  90                                         goto out;
  91                                 }
  92                                 groups[ngroups++] = grp->gr_gid;
  93                                 break;
  94                         }
  95                 }
  96         }
  97 out:
  98         endgrent();
  99         *grpcnt = ngroups;
 100         return (ret);
 101 }
 102 
 103 #endif /* HAVE_GETGROUPLIST */
 104 
 105 #pragma ident   "%Z%%M% %I%     %E% SMI"