1 /* from OpenBSD: getgrouplist.c,v 1.12 2005/08/08 08:05:34 espie Exp */ 2 /* 3 * Copyright (c) 1991, 1993 4 * The Regents of the University of California. All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 3. Neither the name of the University nor the names of its contributors 15 * may be used to endorse or promote products derived from this software 16 * without specific prior written permission. 17 * 18 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 19 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 21 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 24 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 25 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 26 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 27 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 28 * SUCH DAMAGE. 29 */ 30 31 /* OPENBSD ORIGINAL: lib/libc/gen/getgrouplist.c */ 32 33 #include "includes.h" 34 35 #ifndef HAVE_GETGROUPLIST 36 37 /* 38 * get credential 39 */ 40 #include <sys/types.h> 41 #include <string.h> 42 #include <unistd.h> 43 #include <grp.h> 44 45 int 46 getgrouplist(const char *uname, gid_t agroup, gid_t *groups, int *grpcnt) 47 { 48 struct group *grp; 49 int i, ngroups; 50 int ret, maxgroups; 51 int bail; 52 53 ret = 0; 54 ngroups = 0; 55 maxgroups = *grpcnt; 56 57 /* 58 * install primary group 59 */ 60 if (ngroups >= maxgroups) { 61 *grpcnt = ngroups; 62 return (-1); 63 } 64 groups[ngroups++] = agroup; 65 66 /* 67 * Scan the group file to find additional groups. 68 */ 69 setgrent(); 70 while ((grp = getgrent())) { 71 if (grp->gr_gid == agroup) 72 continue; 73 for (bail = 0, i = 0; bail == 0 && i < ngroups; i++) 74 if (groups[i] == grp->gr_gid) 75 bail = 1; 76 if (bail) 77 continue; 78 for (i = 0; grp->gr_mem[i]; i++) { 79 if (!strcmp(grp->gr_mem[i], uname)) { 80 if (ngroups >= maxgroups) { 81 ret = -1; 82 goto out; 83 } 84 groups[ngroups++] = grp->gr_gid; 85 break; 86 } 87 } 88 } 89 out: 90 endgrent(); 91 *grpcnt = ngroups; 92 return (ret); 93 } 94 95 #endif /* HAVE_GETGROUPLIST */ 96