gen/getgrouplist.c

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