2.11BSD#431 - /usr/src/lib/libc/gen/getgrouplist.c

   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: #if defined(LIBC_SCCS) && !defined(lint)
  35: static char sccsid[] = "@(#)getgrouplist.c	8.2.1 (2.11BSD) 1997/6/25";
  36: #endif /* LIBC_SCCS and not lint */
  37: 
  38: /*
  39:  * get credential
  40:  */
  41: #include <sys/types.h>
  42: #include <string.h>
  43: #include <grp.h>
  44: 
  45: int
  46: getgrouplist(uname, agroup, groups, grpcnt)
  47:     char *uname;
  48:     gid_t agroup;
  49:     register gid_t *groups;
  50:     int *grpcnt;
  51: {
  52:     register struct group *grp;
  53:     int i, ngroups, ret, maxgroups;
  54: 
  55:     ret = 0;
  56:     ngroups = 0;
  57:     maxgroups = *grpcnt;
  58:     /*
  59: 	 * When installing primary group, duplicate it;
  60: 	 * the first element of groups is the effective gid
  61: 	 * and will be overwritten when a setgid file is executed.
  62: 	 */
  63:     groups[ngroups++] = agroup;
  64:     if (maxgroups > 1)
  65:         groups[ngroups++] = agroup;
  66:     /*
  67: 	 * Scan the group file to find additional groups.
  68: 	 */
  69:     setgrent();
  70:     while (grp = getgrent()) {
  71:         if (grp->gr_gid == agroup)
  72:             continue;
  73:         for (i = 0; grp->gr_mem[i]; i++) {
  74:             if (!strcmp(grp->gr_mem[i], uname)) {
  75:                 if (ngroups >= maxgroups) {
  76:                     ret = -1;
  77:                     break;
  78:                 }
  79:                 groups[ngroups++] = grp->gr_gid;
  80:                 break;
  81:             }
  82:         }
  83:     }
  84:     endgrent();
  85:     *grpcnt = ngroups;
  86:     return (ret);
  87: }

Defined functions

Defined variables