usr/src/cmd/lp/lib/access/loadaccess.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, Version 1.0 only
   6  * (the "License").  You may not use this file except in compliance
   7  * with the License.
   8  *
   9  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
  10  * or http://www.opensolaris.org/os/licensing.
  11  * See the License for the specific language governing permissions
  12  * and limitations under the License.
  13  *
  14  * When distributing Covered Code, include this CDDL HEADER in each
  15  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
  16  * If applicable, add the following below this CDDL HEADER, with the
  17  * fields enclosed by brackets "[]" replaced with your own identifying
  18  * information: Portions Copyright [yyyy] [name of copyright owner]
  19  *
  20  * CDDL HEADER END
  21  */
  22 /*
  23  * Copyright 1997 Sun Microsystems, Inc.  All rights reserved.
  24  * Use is subject to license terms.
  25  */
  26
  27 /*      Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T */
  28 /*        All Rights Reserved   */
  29
  30
  31 #pragma ident   "%Z%%M% %I%     %E% SMI"        /* SVr4.0 1.9   */
  32 /* EMACS_MODES: !fill, lnumb, !overwrite, !nodelete, !picture */
  33
  34 #include "stdio.h"
  35 #include "errno.h"
  36 #include "string.h"
  37 #include "stdlib.h"
  38
  39 #include "lp.h"
  40 #include "access.h"
  41
  42 static char             **_loadaccess ( char * );
  43
  44 /**
  45  ** load_userform_access() - LOAD ALLOW/DENY LISTS FOR USER+FORM
  46  **/
  47
  48 int
  49 load_userform_access(char *form, char ***pallow, char ***pdeny)
  50 {
  51         return (loadaccess(Lp_A_Forms, form, "", pallow, pdeny));
  52 }
  53
  54 /**
  55  ** load_userprinter_access() - LOAD ALLOW/DENY LISTS FOR USER+PRINTER
  56  **/
  57
  58 int
  59 load_userprinter_access(char *printer, char ***pallow, char ***pdeny)
  60 {
  61         return (loadaccess(Lp_A_Printers, printer, UACCESSPREFIX, pallow,
  62                 pdeny));
  63 }
  64
  65 /**
  66  ** load_formprinter_access() - LOAD ALLOW/DENY LISTS FOR FORM+PRINTER
  67  **/
  68
  69 int
  70 load_formprinter_access(char *printer, char ***pallow, char ***pdeny)
  71 {
  72         return (loadaccess(Lp_A_Printers, printer, FACCESSPREFIX, pallow,
  73                 pdeny));
  74 }
  75
  76 /**
  77  ** load_paperprinter_access() - LOAD ALLOW/DENY LISTS FOR FORM+PRINTER
  78  **/
  79
  80 int
  81 load_paperprinter_access(char *printer, char ***pallow, char ***pdeny)
  82 {
  83         return (loadaccess(Lp_A_Printers, printer, PACCESSPREFIX, pallow,
  84                 pdeny));
  85 }
  86
  87 /**
  88  ** loadaccess() - LOAD ALLOW OR DENY LISTS
  89  **/
  90
  91 int
  92 loadaccess(char *dir, char *name, char *prefix, char ***pallow, char ***pdeny)
  93 {
  94         register char           *allow_file     = 0,
  95                                 *deny_file      = 0;
  96
  97         int                     ret;
  98
  99         if (
 100                 !(allow_file = getaccessfile(dir, name, prefix, ALLOWFILE))
 101              || !(*pallow = _loadaccess(allow_file)) && errno != ENOENT
 102              || !(deny_file = getaccessfile(dir, name, prefix, DENYFILE))
 103              || !(*pdeny = _loadaccess(deny_file)) && errno != ENOENT
 104         )
 105                 ret = -1;
 106         else
 107                 ret = 0;
 108
 109         if (allow_file)
 110                 Free (allow_file);
 111         if (deny_file)
 112                 Free (deny_file);
 113
 114         return (ret);
 115 }
 116
 117 /**
 118  ** _loadaccess() - LOAD ALLOW OR DENY FILE
 119  **/
 120
 121 static char **
 122 _loadaccess(char *file)
 123 {
 124         register size_t         nalloc,
 125                                 nlist;
 126
 127         register char           **list;
 128
 129         int fd;
 130
 131         char                    buf[BUFSIZ];
 132
 133
 134         if ((fd = open_locked(file, "r", 0)) < 0)
 135                 return (0);
 136
 137         /*
 138          * Preallocate space for the initial list. We'll always
 139          * allocate one more than the list size, for the terminating null.
 140          */
 141         nalloc = ACC_MAX_GUESS;
 142         list = (char **)Malloc((nalloc + 1) * sizeof(char *));
 143         if (!list) {
 144                 close(fd);
 145                 errno = ENOMEM;
 146                 return (0);
 147         }
 148
 149         errno = 0;
 150         for (nlist = 0; fdgets(buf, BUFSIZ, fd); ) {
 151
 152                 buf[strlen(buf) - 1] = 0;
 153
 154                 /*
 155                  * Allocate more space if needed.
 156                  */
 157                 if (nlist >= nalloc) {
 158                         nalloc += ACC_MAX_GUESS;
 159                         list = (char **)Realloc(
 160                                 (char *)list,
 161                                 (nalloc + 1) * sizeof(char *)
 162                         );
 163                         if (!list) {
 164                                 close(fd);
 165                                 return (0);
 166                         }
 167                 }
 168
 169                 list[nlist] = Strdup(buf);   /* if fail, minor problem */
 170                 list[++nlist] = 0;
 171
 172         }
 173         if (errno != 0) {
 174                 int                     save_errno = errno;
 175
 176                 close(fd);
 177                 freelist (list);
 178                 errno = save_errno;
 179                 return (0);
 180         }
 181         close(fd);
 182
 183         /*
 184          * If we have more space allocated than we need,
 185          * return the extra.
 186          */
 187         if (nlist != nalloc) {
 188                 list = (char **)Realloc(
 189                         (char *)list,
 190                         (nlist + 1) * sizeof(char *)
 191                 );
 192                 if (!list) {
 193                         errno = ENOMEM;
 194                         return (0);
 195                 }
 196         }
 197         list[nlist] = 0;
 198
 199         return (list);
 200 }