1 /* $NetBSD: getgrouplist.c,v 1.4 1995/02/25 13:41:09 cgd Exp $ */ 2 3 /* 4 * Copyright (c) 1991, 1993 5 * The Regents of the University of California. All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. All advertising materials mentioning features or use of this software 16 * must display the following acknowledgement: 17 * This product includes software developed by the University of 18 * California, Berkeley and its contributors. 19 * 4. Neither the name of the University nor the names of its contributors 20 * may be used to endorse or promote products derived from this software 21 * without specific prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 * SUCH DAMAGE. 34 */ 35 36 #if defined(LIBC_SCCS) && !defined(lint) 37 #if 0 38 static char sccsid[] = "@(#)getgrouplist.c 8.1 (Berkeley) 6/4/93"; 39 #else 40 static char rcsid[] = "$NetBSD: getgrouplist.c,v 1.4 1995/02/25 13:41:09 cgd Exp $"; 41 #endif 42 #endif /* LIBC_SCCS and not lint */ 43 44 /* 45 * get credential 46 */ 47 #include <sys/types.h> 48 #include <string.h> 49 #include <grp.h> 50 51 int 52 getgrouplist(uname, agroup, groups, grpcnt) 53 const char *uname; 54 int agroup; 55 register int *groups; 56 int *grpcnt; 57 { 58 register struct group *grp; 59 register struct passwd *pw; 60 register int i, ngroups; 61 int ret, maxgroups; 62 63 ret = 0; 64 ngroups = 0; 65 maxgroups = *grpcnt; 66 /* 67 * When installing primary group, duplicate it; 68 * the first element of groups is the effective gid 69 * and will be overwritten when a setgid file is executed. 70 */ 71 groups[ngroups++] = agroup; 72 if (maxgroups > 1) 73 groups[ngroups++] = agroup; 74 /* 75 * Scan the group file to find additional groups. 76 */ 77 setgrent(); 78 while (grp = getgrent()) { 79 if (grp->gr_gid == agroup) 80 continue; 81 for (i = 0; grp->gr_mem[i]; i++) { 82 if (!strcmp(grp->gr_mem[i], uname)) { 83 if (ngroups >= maxgroups) { 84 ret = -1; 85 goto out; 86 } 87 groups[ngroups++] = grp->gr_gid; 88 break; 89 } 90 } 91 } 92 out: 93 endgrent(); 94 *grpcnt = ngroups; 95 return (ret); 96 } 97