gen.subproj/getgrent.c

   1 /*
   2  * Copyright (c) 1999 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * Copyright (c) 1999-2003 Apple Computer, Inc.  All Rights Reserved.
   7  *
   8  * This file contains Original Code and/or Modifications of Original Code
   9  * as defined in and that are subject to the Apple Public Source License
  10  * Version 2.0 (the 'License'). You may not use this file except in
  11  * compliance with the License. Please obtain a copy of the License at
  12  * http://www.opensource.apple.com/apsl/ and read it before using this
  13  * file.
  14  *
  15  * The Original Code and all software distributed under the License are
  16  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  17  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  18  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  19  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  20  * Please see the License for the specific language governing rights and
  21  * limitations under the License.
  22  *
  23  * @APPLE_LICENSE_HEADER_END@
  24  */
  25 /*
  26  * Copyright (c) 1989, 1993
  27  *      The Regents of the University of California.  All rights reserved.
  28  *
  29  * Redistribution and use in source and binary forms, with or without
  30  * modification, are permitted provided that the following conditions
  31  * are met:
  32  * 1. Redistributions of source code must retain the above copyright
  33  *    notice, this list of conditions and the following disclaimer.
  34  * 2. Redistributions in binary form must reproduce the above copyright
  35  *    notice, this list of conditions and the following disclaimer in the
  36  *    documentation and/or other materials provided with the distribution.
  37  * 3. All advertising materials mentioning features or use of this software
  38  *    must display the following acknowledgement:
  39  *      This product includes software developed by the University of
  40  *      California, Berkeley and its contributors.
  41  * 4. Neither the name of the University nor the names of its contributors
  42  *    may be used to endorse or promote products derived from this software
  43  *    without specific prior written permission.
  44  *
  45  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  46  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  47  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  48  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  49  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  50  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  51  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  52  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  53  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  54  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  55  * SUCH DAMAGE.
  56  */
  57
  58 #if defined(LIBC_SCCS) && !defined(lint)
  59 static char sccsid[] = "@(#)getgrent.c  8.2 (Berkeley) 3/21/94";
  60 #endif /* LIBC_SCCS and not lint */
  61
  62 #include <sys/types.h>
  63 #include <stdio.h>
  64 #include <stdlib.h>
  65 #include <string.h>
  66 #include <grp.h>
  67
  68 static FILE *_gr_fp;
  69 static struct group _gr_group;
  70 static int _gr_stayopen;
  71 static int grscan(), start_gr();
  72
  73 #define MAXGRP          200
  74 static char *members[MAXGRP];
  75 #define MAXLINELENGTH   1024
  76 static char line[MAXLINELENGTH];
  77
  78 struct group *
  79 getgrent()
  80 {
  81         if ((!_gr_fp && !start_gr()) || !grscan(0, 0, NULL))
  82                 return(NULL);
  83         return(&_gr_group);
  84 }
  85
  86 struct group *
  87 getgrnam(name)
  88         const char *name;
  89 {
  90         int rval;
  91
  92         if (!start_gr())
  93                 return(NULL);
  94         rval = grscan(1, 0, name);
  95         if (!_gr_stayopen)
  96                 endgrent();
  97         return(rval ? &_gr_group : NULL);
  98 }
  99
 100 struct group *
 101 #ifdef __STDC__
 102 getgrgid(gid_t gid)
 103 #else
 104 getgrgid(gid)
 105         gid_t gid;
 106 #endif
 107 {
 108         int rval;
 109
 110         if (!start_gr())
 111                 return(NULL);
 112         rval = grscan(1, gid, NULL);
 113         if (!_gr_stayopen)
 114                 endgrent();
 115         return(rval ? &_gr_group : NULL);
 116 }
 117
 118 static int
 119 start_gr()
 120 {
 121         if (_gr_fp) {
 122                 rewind(_gr_fp);
 123                 return(1);
 124         }
 125         return((_gr_fp = fopen(_PATH_GROUP, "r")) ? 1 : 0);
 126 }
 127
 128 int
 129 setgrent()
 130 {
 131         return(setgroupent(0));
 132 }
 133
 134 int
 135 setgroupent(stayopen)
 136         int stayopen;
 137 {
 138         if (!start_gr())
 139                 return(0);
 140         _gr_stayopen = stayopen;
 141         return(1);
 142 }
 143
 144 void
 145 endgrent()
 146 {
 147         if (_gr_fp) {
 148                 (void)fclose(_gr_fp);
 149                 _gr_fp = NULL;
 150         }
 151 }
 152
 153 static int
 154 grscan(search, gid, name)
 155         register int search, gid;
 156         register char *name;
 157 {
 158         register char *cp, **m;
 159         char *bp;
 160         char *fgets(), *strsep(), *index();
 161
 162         for (;;) {
 163                 if (!fgets(line, sizeof(line), _gr_fp))
 164                         return(0);
 165                 bp = line;
 166                 /* skip lines that are too big */
 167                 if (!index(line, '\n')) {
 168                         int ch;
 169
 170                         while ((ch = getc(_gr_fp)) != '\n' && ch != EOF)
 171                                 ;
 172                         continue;
 173                 }
 174                 _gr_group.gr_name = strsep(&bp, ":\n");
 175                 if (search && name && strcmp(_gr_group.gr_name, name))
 176                         continue;
 177                 _gr_group.gr_passwd = strsep(&bp, ":\n");
 178                 if (!(cp = strsep(&bp, ":\n")))
 179                         continue;
 180                 _gr_group.gr_gid = atoi(cp);
 181                 if (search && name == NULL && _gr_group.gr_gid != gid)
 182                         continue;
 183                 cp = NULL;
 184                 for (m = _gr_group.gr_mem = members;; bp++) {
 185                         if (m == &members[MAXGRP - 1])
 186                                 break;
 187                         if (*bp == ',') {
 188                                 if (cp) {
 189                                         *bp = '\0';
 190                                         *m++ = cp;
 191                                         cp = NULL;
 192                                 }
 193                         } else if (*bp == '\0' || *bp == '\n' || *bp == ' ') {
 194                                 if (cp) {
 195                                         *bp = '\0';
 196                                         *m++ = cp;
 197                         }
 198                                 break;
 199                         } else if (cp == NULL)
 200                                 cp = bp;
 201                 }
 202                 *m = NULL;
 203                 return(1);
 204         }
 205         /* NOTREACHED */
 206 }