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 * @(#)getgrouplist.c 8.2 (Berkeley) 12/8/94 34 * $DragonFly: src/lib/libc/gen/getgrouplist.c,v 1.5 2004/09/19 17:25:42 joerg Exp $ 35 */ 36 37 /* 38 * get credential 39 */ 40 #include <sys/types.h> 41 #include <string.h> 42 #include <grp.h> 43 44 int 45 getgrouplist(const char *uname, gid_t agroup, gid_t *groups, int *grpcnt) 46 { 47 struct group *grp; 48 int i, ngroups; 49 int ret, maxgroups; 50 51 ret = 0; 52 ngroups = 0; 53 maxgroups = *grpcnt; 54 /* 55 * When installing primary group, duplicate it; 56 * the first element of groups is the effective gid 57 * and will be overwritten when a setgid file is executed. 58 */ 59 groups[ngroups++] = agroup; 60 if (maxgroups > 1) 61 groups[ngroups++] = agroup; 62 /* 63 * Scan the group file to find additional groups. 64 */ 65 setgrent(); 66 while (grp = getgrent()) { 67 for (i = 0; i < ngroups; i++) { 68 if (grp->gr_gid == groups[i]) 69 goto skip; 70 } 71 for (i = 0; grp->gr_mem[i]; i++) { 72 if (!strcmp(grp->gr_mem[i], uname)) { 73 if (ngroups >= maxgroups) { 74 ret = -1; 75 break; 76 } 77 groups[ngroups++] = grp->gr_gid; 78 break; 79 } 80 } 81 skip: 82 ; 83 } 84 endgrent(); 85 *grpcnt = ngroups; 86 return (ret); 87 } 88