1 /* $NetBSD: getgrouplist.c,v 1.15 2000/01/22 22:19:10 mycroft 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 #include <sys/cdefs.h> 37 #if defined(LIBC_SCCS) && !defined(lint) 38 #if 0 39 static char sccsid[] = "@(#)getgrouplist.c 8.2 (Berkeley) 12/8/94"; 40 #else 41 __RCSID("$NetBSD: getgrouplist.c,v 1.15 2000/01/22 22:19:10 mycroft Exp $"); 42 #endif 43 #endif /* LIBC_SCCS and not lint */ 44 45 /* 46 * get credential 47 */ 48 #include "namespace.h" 49 #include <sys/param.h> 50 51 #include <assert.h> 52 #include <grp.h> 53 #include <string.h> 54 #include <unistd.h> 55 56 #ifdef __weak_alias 57 __weak_alias(getgrouplist,_getgrouplist) 58 #endif 59 60 int 61 getgrouplist(uname, agroup, groups, grpcnt) 62 const char *uname; 63 gid_t agroup; 64 gid_t *groups; 65 int *grpcnt; 66 { 67 struct group *grp; 68 int i, ngroups; 69 int ret, maxgroups; 70 71 _DIAGASSERT(uname != NULL); 72 _DIAGASSERT(groups != NULL); 73 _DIAGASSERT(grpcnt != NULL); 74 75 ret = 0; 76 ngroups = 0; 77 maxgroups = *grpcnt; 78 79 /* 80 * install primary group 81 */ 82 if (ngroups < maxgroups) 83 groups[ngroups] = agroup; 84 else 85 ret = -1; 86 ngroups++; 87 88 /* 89 * Scan the group file to find additional groups. 90 */ 91 setgrent(); 92 nextgroup: 93 while ((grp = getgrent()) != NULL) { 94 if (grp->gr_gid == agroup) 95 continue; 96 for (i = 0; grp->gr_mem[i]; i++) { 97 if (!strcmp(grp->gr_mem[i], uname)) { 98 for (i = 0; i < MIN(ngroups, maxgroups); i++) { 99 if (grp->gr_gid == groups[i]) 100 goto nextgroup; 101 } 102 if (ngroups < maxgroups) 103 groups[ngroups] = grp->gr_gid; 104 else 105 ret = -1; 106 ngroups++; 107 break; 108 } 109 } 110 } 111 endgrent(); 112 *grpcnt = ngroups; 113 return (ret); 114 } 115