1 /* OPENBSD ORIGINAL: lib/libc/gen/getgrouplist.c */ 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. Neither the name of the University nor the names of its contributors 16 * may be used to endorse or promote products derived from this software 17 * without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 */ 31 32 #include "includes.h" 33 34 #ifndef HAVE_GETGROUPLIST 35 36 #if defined(LIBC_SCCS) && !defined(lint) 37 static char rcsid[] = "$OpenBSD: getgrouplist.c,v 1.9 2003/06/25 21:16:47 deraadt Exp $"; 38 #endif /* LIBC_SCCS and not lint */ 39 40 /* 41 * get credential 42 */ 43 #include <sys/types.h> 44 #include <string.h> 45 #include <unistd.h> 46 #include <grp.h> 47 48 int 49 getgrouplist(uname, agroup, groups, grpcnt) 50 const char *uname; 51 gid_t agroup; 52 register gid_t *groups; 53 int *grpcnt; 54 { 55 register struct group *grp; 56 register int i, ngroups; 57 int ret, maxgroups; 58 int bail; 59 60 ret = 0; 61 ngroups = 0; 62 maxgroups = *grpcnt; 63 64 /* 65 * install primary group 66 */ 67 if (ngroups >= maxgroups) { 68 *grpcnt = ngroups; 69 return (-1); 70 } 71 groups[ngroups++] = agroup; 72 73 /* 74 * Scan the group file to find additional groups. 75 */ 76 setgrent(); 77 while ((grp = getgrent())) { 78 if (grp->gr_gid == agroup) 79 continue; 80 for (bail = 0, i = 0; bail == 0 && i < ngroups; i++) 81 if (groups[i] == grp->gr_gid) 82 bail = 1; 83 if (bail) 84 continue; 85 for (i = 0; grp->gr_mem[i]; i++) { 86 if (!strcmp(grp->gr_mem[i], uname)) { 87 if (ngroups >= maxgroups) { 88 ret = -1; 89 goto out; 90 } 91 groups[ngroups++] = grp->gr_gid; 92 break; 93 } 94 } 95 } 96 out: 97 endgrent(); 98 *grpcnt = ngroups; 99 return (ret); 100 } 101 102 #endif /* HAVE_GETGROUPLIST */ 103