getgrouplist.c revision 90039
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) 35static char sccsid[] = "@(#)getgrouplist.c 8.2 (Berkeley) 12/8/94"; 36#endif /* LIBC_SCCS and not lint */$ 37#include <sys/cdefs.h> 38__FBSDID("$FreeBSD: head/lib/libc/gen/getgrouplist.c 90039 2002-02-01 00:57:29Z obrien $"); 39 40/* 41 * get credential 42 */ 43#include <sys/types.h> 44#include <string.h> 45#include <grp.h> 46 47int 48getgrouplist(uname, agroup, groups, grpcnt) 49 const char *uname; 50 gid_t agroup; 51 gid_t *groups; 52 int *grpcnt; 53{ 54 struct group *grp; 55 int i, ngroups; 56 int ret, maxgroups; 57 58 ret = 0; 59 ngroups = 0; 60 maxgroups = *grpcnt; 61 /* 62 * When installing primary group, duplicate it; 63 * the first element of groups is the effective gid 64 * and will be overwritten when a setgid file is executed. 65 */ 66 groups[ngroups++] = agroup; 67 if (maxgroups > 1) 68 groups[ngroups++] = agroup; 69 /* 70 * Scan the group file to find additional groups. 71 */ 72 setgrent(); 73 while (grp = getgrent()) { 74 for (i = 0; i < ngroups; i++) { 75 if (grp->gr_gid == groups[i]) 76 goto skip; 77 } 78 for (i = 0; grp->gr_mem[i]; i++) { 79 if (!strcmp(grp->gr_mem[i], uname)) { 80 if (ngroups >= maxgroups) { 81 ret = -1; 82 break; 83 } 84 groups[ngroups++] = grp->gr_gid; 85 break; 86 } 87 } 88skip: 89 } 90 endgrent(); 91 *grpcnt = ngroups; 92 return (ret); 93} 94