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 rcsid[] = "$OpenBSD: getgrouplist.c,v 1.7 1997/08/19 19:13:27 deraadt Exp $"; 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 const char *uname; 48 gid_t agroup; 49 register gid_t *groups; 50 int *grpcnt; 51 { 52 register struct group *grp; 53 register int i, ngroups; 54 int ret, maxgroups; 55 int bail; 56 57 ret = 0; 58 ngroups = 0; 59 maxgroups = *grpcnt; 60 61 /* 62 * install primary group 63 */ 64 if (ngroups >= maxgroups) { 65 *grpcnt = ngroups; 66 return (-1); 67 } 68 groups[ngroups++] = agroup; 69 70 /* 71 * Scan the group file to find additional groups. 72 */ 73 setgrent(); 74 while ((grp = getgrent())) { 75 if (grp->gr_gid == agroup) 76 continue; 77 for (bail = 0, i = 0; bail == 0 && i < ngroups; i++) 78 if (groups[i] == grp->gr_gid) 79 bail = 1; 80 if (bail) 81 continue; 82 for (i = 0; grp->gr_mem[i]; i++) { 83 if (!strcmp(grp->gr_mem[i], uname)) { 84 if (ngroups >= maxgroups) { 85 ret = -1; 86 goto out; 87 } 88 groups[ngroups++] = grp->gr_gid; 89 break; 90 } 91 } 92 } 93 out: 94 endgrent(); 95 *grpcnt = ngroups; 96 return (ret); 97 } 98