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. Neither the name of the University nor the names of its contributors 14 * may be used to endorse or promote products derived from this software 15 * without specific prior written permission. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 */ 29 30 #if defined(LIBC_SCCS) && !defined(lint) 31 static char rcsid[] = "$OpenBSD: getgrouplist.c,v 1.9 2003/06/25 21:16:47 deraadt Exp $"; 32 #endif /* LIBC_SCCS and not lint */ 33 34 /* 35 * get credential 36 */ 37 #include <sys/types.h> 38 #include <string.h> 39 #include <unistd.h> 40 #include <grp.h> 41 42 int 43 getgrouplist(uname, agroup, groups, grpcnt) 44 const char *uname; 45 gid_t agroup; 46 register gid_t *groups; 47 int *grpcnt; 48 { 49 register struct group *grp; 50 register int i, ngroups; 51 int ret, maxgroups; 52 int bail; 53 54 ret = 0; 55 ngroups = 0; 56 maxgroups = *grpcnt; 57 58 /* 59 * install primary group 60 */ 61 if (ngroups >= maxgroups) { 62 *grpcnt = ngroups; 63 return (-1); 64 } 65 groups[ngroups++] = agroup; 66 67 /* 68 * Scan the group file to find additional groups. 69 */ 70 setgrent(); 71 while ((grp = getgrent())) { 72 if (grp->gr_gid == agroup) 73 continue; 74 for (bail = 0, i = 0; bail == 0 && i < ngroups; i++) 75 if (groups[i] == grp->gr_gid) 76 bail = 1; 77 if (bail) 78 continue; 79 for (i = 0; grp->gr_mem[i]; i++) { 80 if (!strcmp(grp->gr_mem[i], uname)) { 81 if (ngroups >= maxgroups) { 82 ret = -1; 83 goto out; 84 } 85 groups[ngroups++] = grp->gr_gid; 86 break; 87 } 88 } 89 } 90 out: 91 endgrent(); 92 *grpcnt = ngroups; 93 return (ret); 94 } 95