1 /* 2 * Copyright (c) 1983 Regents of the University of California. 3 * 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. All advertising materials mentioning features or use of this software 14 * must display the following acknowledgement: 15 * This product includes software developed by the University of 16 * California, Berkeley and its contributors. 17 * 4. Neither the name of the University nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 */ 33 34 #if defined(LIBC_SCCS) && !defined(lint) 35 /*static char sccsid[] = "from: @(#)initgroups.c 5.7 (Berkeley) 2/23/91";*/ 36 static char rcsid[] = "$Id: initgroups.c,v 1.2 1993/07/30 08:22:46 mycroft Exp $"; 37 #endif /* LIBC_SCCS and not lint */ 38 39 /* 40 * initgroups 41 */ 42 #include <sys/param.h> 43 #include <stdio.h> 44 #include <string.h> 45 #include <unistd.h> 46 #include <grp.h> 47 48 struct group *getgrent(); 49 50 int 51 initgroups(uname, agroup) 52 const char *uname; 53 int agroup; 54 { 55 int groups[NGROUPS], ngroups = 0; 56 register struct group *grp; 57 register int i; 58 59 /* 60 * If installing primary group, duplicate it; 61 * the first element of groups is the effective gid 62 * and will be overwritten when a setgid file is executed. 63 */ 64 if (agroup >= 0) { 65 groups[ngroups++] = agroup; 66 groups[ngroups++] = agroup; 67 } 68 setgrent(); 69 while (grp = getgrent()) { 70 if (grp->gr_gid == agroup) 71 continue; 72 for (i = 0; grp->gr_mem[i]; i++) 73 if (!strcmp(grp->gr_mem[i], uname)) { 74 if (ngroups == NGROUPS) { 75 fprintf(stderr, "initgroups: %s is in too many groups\n", uname); 76 goto toomany; 77 } 78 groups[ngroups++] = grp->gr_gid; 79 } 80 } 81 toomany: 82 endgrent(); 83 if (setgroups(ngroups, groups) < 0) { 84 perror("setgroups"); 85 return (-1); 86 } 87 return (0); 88 } 89