gen.subproj/getgrent.c

   1 /*
   2  * Copyright (c) 1999 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * Portions Copyright (c) 1999 Apple Computer, Inc.  All Rights
   7  * Reserved.  This file contains Original Code and/or Modifications of
   8  * Original Code as defined in and that are subject to the Apple Public
   9  * Source License Version 1.1 (the "License").  You may not use this file
  10  * except in compliance with the License.  Please obtain a copy of the
  11  * License at http://www.apple.com/publicsource and read it before using
  12  * this file.
  13  *
  14  * The Original Code and all software distributed under the License are
  15  * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  16  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  17  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  18  * FITNESS FOR A PARTICULAR PURPOSE OR NON- INFRINGEMENT.  Please see the
  19  * License for the specific language governing rights and limitations
  20  * under the License.
  21  *
  22  * @APPLE_LICENSE_HEADER_END@
  23  */
  24 /*
  25  * Copyright (c) 1989, 1993
  26  *      The Regents of the University of California.  All rights reserved.
  27  *
  28  * Redistribution and use in source and binary forms, with or without
  29  * modification, are permitted provided that the following conditions
  30  * are met:
  31  * 1. Redistributions of source code must retain the above copyright
  32  *    notice, this list of conditions and the following disclaimer.
  33  * 2. Redistributions in binary form must reproduce the above copyright
  34  *    notice, this list of conditions and the following disclaimer in the
  35  *    documentation and/or other materials provided with the distribution.
  36  * 3. All advertising materials mentioning features or use of this software
  37  *    must display the following acknowledgement:
  38  *      This product includes software developed by the University of
  39  *      California, Berkeley and its contributors.
  40  * 4. Neither the name of the University nor the names of its contributors
  41  *    may be used to endorse or promote products derived from this software
  42  *    without specific prior written permission.
  43  *
  44  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  45  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  46  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  47  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  48  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  49  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  50  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  51  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  52  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  53  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  54  * SUCH DAMAGE.
  55  */
  56
  57 #if defined(LIBC_SCCS) && !defined(lint)
  58 static char sccsid[] = "@(#)getgrent.c  8.2 (Berkeley) 3/21/94";
  59 #endif /* LIBC_SCCS and not lint */
  60
  61 #include <sys/types.h>
  62 #include <stdio.h>
  63 #include <stdlib.h>
  64 #include <string.h>
  65 #include <grp.h>
  66
  67 static FILE *_gr_fp;
  68 static struct group _gr_group;
  69 static int _gr_stayopen;
  70 static int grscan(), start_gr();
  71
  72 #define MAXGRP          200
  73 static char *members[MAXGRP];
  74 #define MAXLINELENGTH   1024
  75 static char line[MAXLINELENGTH];
  76
  77 struct group *
  78 getgrent()
  79 {
  80         if ((!_gr_fp && !start_gr()) || !grscan(0, 0, NULL))
  81                 return(NULL);
  82         return(&_gr_group);
  83 }
  84
  85 struct group *
  86 getgrnam(name)
  87         const char *name;
  88 {
  89         int rval;
  90
  91         if (!start_gr())
  92                 return(NULL);
  93         rval = grscan(1, 0, name);
  94         if (!_gr_stayopen)
  95                 endgrent();
  96         return(rval ? &_gr_group : NULL);
  97 }
  98
  99 struct group *
 100 #ifdef __STDC__
 101 getgrgid(gid_t gid)
 102 #else
 103 getgrgid(gid)
 104         gid_t gid;
 105 #endif
 106 {
 107         int rval;
 108
 109         if (!start_gr())
 110                 return(NULL);
 111         rval = grscan(1, gid, NULL);
 112         if (!_gr_stayopen)
 113                 endgrent();
 114         return(rval ? &_gr_group : NULL);
 115 }
 116
 117 static int
 118 start_gr()
 119 {
 120         if (_gr_fp) {
 121                 rewind(_gr_fp);
 122                 return(1);
 123         }
 124         return((_gr_fp = fopen(_PATH_GROUP, "r")) ? 1 : 0);
 125 }
 126
 127 int
 128 setgrent()
 129 {
 130         return(setgroupent(0));
 131 }
 132
 133 int
 134 setgroupent(stayopen)
 135         int stayopen;
 136 {
 137         if (!start_gr())
 138                 return(0);
 139         _gr_stayopen = stayopen;
 140         return(1);
 141 }
 142
 143 void
 144 endgrent()
 145 {
 146         if (_gr_fp) {
 147                 (void)fclose(_gr_fp);
 148                 _gr_fp = NULL;
 149         }
 150 }
 151
 152 static int
 153 grscan(search, gid, name)
 154         register int search, gid;
 155         register char *name;
 156 {
 157         register char *cp, **m;
 158         char *bp;
 159         char *fgets(), *strsep(), *index();
 160
 161         for (;;) {
 162                 if (!fgets(line, sizeof(line), _gr_fp))
 163                         return(0);
 164                 bp = line;
 165                 /* skip lines that are too big */
 166                 if (!index(line, '\n')) {
 167                         int ch;
 168
 169                         while ((ch = getc(_gr_fp)) != '\n' && ch != EOF)
 170                                 ;
 171                         continue;
 172                 }
 173                 _gr_group.gr_name = strsep(&bp, ":\n");
 174                 if (search && name && strcmp(_gr_group.gr_name, name))
 175                         continue;
 176                 _gr_group.gr_passwd = strsep(&bp, ":\n");
 177                 if (!(cp = strsep(&bp, ":\n")))
 178                         continue;
 179                 _gr_group.gr_gid = atoi(cp);
 180                 if (search && name == NULL && _gr_group.gr_gid != gid)
 181                         continue;
 182                 cp = NULL;
 183                 for (m = _gr_group.gr_mem = members;; bp++) {
 184                         if (m == &members[MAXGRP - 1])
 185                                 break;
 186                         if (*bp == ',') {
 187                                 if (cp) {
 188                                         *bp = '\0';
 189                                         *m++ = cp;
 190                                         cp = NULL;
 191                                 }
 192                         } else if (*bp == '\0' || *bp == '\n' || *bp == ' ') {
 193                                 if (cp) {
 194                                         *bp = '\0';
 195                                         *m++ = cp;
 196                         }
 197                                 break;
 198                         } else if (cp == NULL)
 199                                 cp = bp;
 200                 }
 201                 *m = NULL;
 202                 return(1);
 203         }
 204         /* NOTREACHED */
 205 }