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 are permitted 6 * provided that the above copyright notice and this paragraph are 7 * duplicated in all such forms and that any documentation, 8 * advertising materials, and other materials related to such 9 * distribution and use acknowledge that the software was developed 10 * by the University of California, Berkeley. The name of the 11 * University may not be used to endorse or promote products derived 12 * from this software without specific prior written permission. 13 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR 14 * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED 15 * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE. 16 */ 17 18 #if defined(LIBC_SCCS) && !defined(lint) 19 static char sccsid[] = "@(#)initgroups.c 5.5 (Berkeley) 08/26/89"; 20 #endif /* LIBC_SCCS and not lint */ 21 22 /* 23 * initgroups 24 */ 25 #include <stdio.h> 26 #include <sys/param.h> 27 #include <grp.h> 28 29 struct group *getgrent(); 30 31 initgroups(uname, agroup) 32 char *uname; 33 int agroup; 34 { 35 int groups[NGROUPS], ngroups = 0; 36 register struct group *grp; 37 register int i; 38 39 /* 40 * If installing primary group, duplicate it; 41 * the first element of groups is the effective gid 42 * and will be overwritten when a setgid file is executed. 43 */ 44 if (agroup >= 0) { 45 groups[ngroups++] = agroup; 46 groups[ngroups++] = agroup; 47 } 48 setgrent(); 49 while (grp = getgrent()) { 50 if (grp->gr_gid == agroup) 51 continue; 52 for (i = 0; grp->gr_mem[i]; i++) 53 if (!strcmp(grp->gr_mem[i], uname)) { 54 if (ngroups == NGROUPS) { 55 fprintf(stderr, "initgroups: %s is in too many groups\n", uname); 56 goto toomany; 57 } 58 groups[ngroups++] = grp->gr_gid; 59 } 60 } 61 toomany: 62 endgrent(); 63 if (setgroups(ngroups, groups) < 0) { 64 perror("setgroups"); 65 return (-1); 66 } 67 return (0); 68 } 69