usr/src/cmd/oamuser/group/add_group.c

   1 /*
   2  * CDDL HEADER START
   3  *
   4  * The contents of this file are subject to the terms of the
   5  * Common Development and Distribution License (the "License").
   6  * You may not use this file except in compliance with the License.
   7  *
   8  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
   9  * or http://www.opensolaris.org/os/licensing.
  10  * See the License for the specific language governing permissions
  11  * and limitations under the License.
  12  *
  13  * When distributing Covered Code, include this CDDL HEADER in each
  14  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
  15  * If applicable, add the following below this CDDL HEADER, with the
  16  * fields enclosed by brackets "[]" replaced with your own identifying
  17  * information: Portions Copyright [yyyy] [name of copyright owner]
  18  *
  19  * CDDL HEADER END
  20  */
  21 /*
  22  * Copyright 2007 Sun Microsystems, Inc.  All rights reserved.
  23  * Use is subject to license terms.
  24  */
  25
  26 /*      Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T */
  27 /*      All Rights Reserved     */
  28
  29
  30 #pragma ident   "%Z%%M% %I%     %E% SMI"        /* SVr4.0 1.3 */
  31
  32 #include        <sys/types.h>
  33 #include        <sys/stat.h>
  34 #include        <stdio.h>
  35 #include        <unistd.h>
  36 #include        <userdefs.h>
  37
  38 #define GRPTMP          "/etc/gtmp"
  39 #define GRPBUFSIZ       5120
  40
  41 int
  42 add_group(group, gid)
  43 char *group;    /* name of group to add */
  44 gid_t gid;              /* gid of group to add */
  45 {
  46         FILE *etcgrp;           /* /etc/group file */
  47         FILE *etctmp;           /* temp file */
  48         int o_mask;             /* old umask value */
  49         int newdone = 0;        /* set true when new entry done */
  50         struct stat sb;         /* stat buf to copy modes */
  51         char buf[GRPBUFSIZ];
  52
  53         if ((etcgrp = fopen(GROUP, "r")) == NULL) {
  54                 return (EX_UPDATE);
  55         }
  56
  57         if (fstat(fileno(etcgrp), &sb) < 0) {
  58                 /* If we can't get mode, take a default */
  59                 sb.st_mode = S_IRUSR|S_IWUSR|S_IRGRP|S_IROTH;
  60         }
  61
  62         o_mask = umask(077);
  63         etctmp = fopen(GRPTMP, "w+");
  64         (void) umask(o_mask);
  65
  66         if (etctmp == NULL) {
  67                 fclose(etcgrp);
  68                 return (EX_UPDATE);
  69         }
  70
  71         if (fchmod(fileno(etctmp), sb.st_mode) != 0 ||
  72             fchown(fileno(etctmp), sb.st_uid, sb.st_gid) != 0 ||
  73             lockf(fileno(etctmp), F_LOCK, 0) != 0) {
  74                 fclose(etcgrp);
  75                 fclose(etctmp);
  76                 unlink(GRPTMP);
  77                 return (EX_UPDATE);
  78         }
  79
  80         while (fgets(buf, GRPBUFSIZ, etcgrp) != NULL) {
  81                 /* Check for NameService reference */
  82                 if (!newdone && (buf[0] == '+' || buf[0] == '-')) {
  83                         (void) fprintf(etctmp, "%s::%u:\n", group, gid);
  84                         newdone = 1;
  85                 }
  86
  87                 fputs(buf, etctmp);
  88         }
  89
  90
  91         (void) fclose(etcgrp);
  92
  93         if (!newdone) {
  94                 (void) fprintf(etctmp, "%s::%u:\n", group, gid);
  95         }
  96
  97         if (rename(GRPTMP, GROUP) < 0) {
  98                 fclose(etctmp);
  99                 unlink(GRPTMP);
 100                 return (EX_UPDATE);
 101         }
 102
 103         (void) fclose(etctmp);
 104
 105
 106         return (EX_SUCCESS);
 107 }