1 /* $NetBSD: initgroups.c,v 1.21 2003/08/07 16:42:51 agc Exp $ */ 2 3 /* 4 * Copyright (c) 1983, 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 <sys/cdefs.h> 33 #if defined(LIBC_SCCS) && !defined(lint) 34 #if 0 35 static char sccsid[] = "@(#)initgroups.c 8.1 (Berkeley) 6/4/93"; 36 #else 37 __RCSID("$NetBSD: initgroups.c,v 1.21 2003/08/07 16:42:51 agc Exp $"); 38 #endif 39 #endif /* LIBC_SCCS and not lint */ 40 41 #include "namespace.h" 42 #include <sys/param.h> 43 44 #include <assert.h> 45 #include <stdio.h> 46 #include <unistd.h> 47 #include <stdlib.h> 48 #include <errno.h> 49 50 #ifdef __weak_alias 51 __weak_alias(initgroups,_initgroups) 52 #endif 53 54 int 55 initgroups(uname, agroup) 56 const char *uname; 57 gid_t agroup; 58 { 59 gid_t groups_list[NGROUPS]; 60 int ngroups; 61 gid_t *groups = groups_list; 62 int rval; 63 64 _DIAGASSERT(uname != NULL); 65 66 ngroups = NGROUPS; 67 if (getgrouplist(uname, agroup, groups, &ngroups) == -1) { 68 int maxgroups = ngroups; 69 groups = calloc((size_t)maxgroups, sizeof *groups); 70 if (groups == NULL) 71 return -1; 72 if (getgrouplist(uname, agroup, groups, &ngroups) == -1) 73 ngroups = maxgroups; 74 } 75 rval = setgroups(ngroups, groups); 76 if (rval == -1 && errno == EINVAL) { 77 int ng = (int)sysconf(_SC_NGROUPS_MAX); 78 if (ng > 0 && ng < ngroups) 79 rval = setgroups(ng, groups); 80 } 81 if (groups != groups_list) 82 free(groups); 83 return rval; 84 } 85