util.subproj/getgrouplist.c

   1 /*
   2  * Copyright (c) 1999 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * Portions Copyright (c) 1999 Apple Computer, Inc.  All Rights
   7  * Reserved.  This file contains Original Code and/or Modifications of
   8  * Original Code as defined in and that are subject to the Apple Public
   9  * Source License Version 1.1 (the "License").  You may not use this file
  10  * except in compliance with the License.  Please obtain a copy of the
  11  * License at http://www.apple.com/publicsource and read it before using
  12  * this file.
  13  *
  14  * The Original Code and all software distributed under the License are
  15  * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  16  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  17  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  18  * FITNESS FOR A PARTICULAR PURPOSE OR NON- INFRINGEMENT.  Please see the
  19  * License for the specific language governing rights and limitations
  20  * under the License.
  21  *
  22  * @APPLE_LICENSE_HEADER_END@
  23  */
  24 /*
  25  * Copyright (c) 1991, 1993
  26  *      The Regents of the University of California.  All rights reserved.
  27  *
  28  * Redistribution and use in source and binary forms, with or without
  29  * modification, are permitted provided that the following conditions
  30  * are met:
  31  * 1. Redistributions of source code must retain the above copyright
  32  *    notice, this list of conditions and the following disclaimer.
  33  * 2. Redistributions in binary form must reproduce the above copyright
  34  *    notice, this list of conditions and the following disclaimer in the
  35  *    documentation and/or other materials provided with the distribution.
  36  * 3. All advertising materials mentioning features or use of this software
  37  *    must display the following acknowledgement:
  38  *      This product includes software developed by the University of
  39  *      California, Berkeley and its contributors.
  40  * 4. Neither the name of the University nor the names of its contributors
  41  *    may be used to endorse or promote products derived from this software
  42  *    without specific prior written permission.
  43  *
  44  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  45  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  46  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  47  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  48  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  49  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  50  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  51  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  52  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  53  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  54  * SUCH DAMAGE.
  55  */
  56
  57 #if defined(LIBC_SCCS) && !defined(lint)
  58 static char sccsid[] = "@(#)getgrouplist.c      8.2 (Berkeley) 12/8/94";
  59 #endif /* LIBC_SCCS and not lint */
  60
  61 /*
  62  * get credential
  63  */
  64 #include <sys/types.h>
  65 #include <string.h>
  66 #include <grp.h>
  67
  68 int
  69 getgrouplist(uname, agroup, groups, grpcnt)
  70         const char *uname;
  71         int agroup;
  72         register int *groups;
  73         int *grpcnt;
  74 {
  75         register struct group *grp;
  76         register int i, ngroups;
  77         int ret, maxgroups;
  78
  79         ret = 0;
  80         ngroups = 0;
  81         maxgroups = *grpcnt;
  82         /*
  83          * When installing primary group, duplicate it;
  84          * the first element of groups is the effective gid
  85          * and will be overwritten when a setgid file is executed.
  86          */
  87         groups[ngroups++] = agroup;
  88         if (maxgroups > 1)
  89                 groups[ngroups++] = agroup;
  90         /*
  91          * Scan the group file to find additional groups.
  92          */
  93         setgrent();
  94         while ((grp = getgrent())) {
  95                 if (grp->gr_gid == agroup)
  96                         continue;
  97                 for (i = 0; grp->gr_mem[i]; i++) {
  98                         if (!strcmp(grp->gr_mem[i], uname)) {
  99                                 if (ngroups >= maxgroups) {
 100                                         ret = -1;
 101                                         break;
 102                                 }
 103                                 groups[ngroups++] = grp->gr_gid;
 104                                 break;
 105                         }
 106                 }
 107         }
 108         endgrent();
 109         *grpcnt = ngroups;
 110         return (ret);
 111 }