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 <grp.h>
  65
  66 static FILE *_gr_fp;
  67 static struct group _gr_group;
  68 static int _gr_stayopen;
  69 static int grscan(), start_gr();
  70
  71 #define MAXGRP          200
  72 static char *members[MAXGRP];
  73 #define MAXLINELENGTH   1024
  74 static char line[MAXLINELENGTH];
  75
  76 struct group *
  77 getgrent()
  78 {
  79         if (!_gr_fp && !start_gr() || !grscan(0, 0, NULL))
  80                 return(NULL);
  81         return(&_gr_group);
  82 }
  83
  84 struct group *
  85 getgrnam(name)
  86         const char *name;
  87 {
  88         int rval;
  89
  90         if (!start_gr())
  91                 return(NULL);
  92         rval = grscan(1, 0, name);
  93         if (!_gr_stayopen)
  94                 endgrent();
  95         return(rval ? &_gr_group : NULL);
  96 }
  97
  98 struct group *
  99 #ifdef __STDC__
 100 getgrgid(gid_t gid)
 101 #else
 102 getgrgid(gid)
 103         gid_t gid;
 104 #endif
 105 {
 106         int rval;
 107
 108         if (!start_gr())
 109                 return(NULL);
 110         rval = grscan(1, gid, NULL);
 111         if (!_gr_stayopen)
 112                 endgrent();
 113         return(rval ? &_gr_group : NULL);
 114 }
 115
 116 static
 117 start_gr()
 118 {
 119         if (_gr_fp) {
 120                 rewind(_gr_fp);
 121                 return(1);
 122         }
 123         return((_gr_fp = fopen(_PATH_GROUP, "r")) ? 1 : 0);
 124 }
 125
 126 int
 127 setgrent()
 128 {
 129         return(setgroupent(0));
 130 }
 131
 132 int
 133 setgroupent(stayopen)
 134         int stayopen;
 135 {
 136         if (!start_gr())
 137                 return(0);
 138         _gr_stayopen = stayopen;
 139         return(1);
 140 }
 141
 142 void
 143 endgrent()
 144 {
 145         if (_gr_fp) {
 146                 (void)fclose(_gr_fp);
 147                 _gr_fp = NULL;
 148         }
 149 }
 150
 151 static
 152 grscan(search, gid, name)
 153         register int search, gid;
 154         register char *name;
 155 {
 156         register char *cp, **m;
 157         char *bp;
 158         char *fgets(), *strsep(), *index();
 159
 160         for (;;) {
 161                 if (!fgets(line, sizeof(line), _gr_fp))
 162                         return(0);
 163                 bp = line;
 164                 /* skip lines that are too big */
 165                 if (!index(line, '\n')) {
 166                         int ch;
 167
 168                         while ((ch = getc(_gr_fp)) != '\n' && ch != EOF)
 169                                 ;
 170                         continue;
 171                 }
 172                 _gr_group.gr_name = strsep(&bp, ":\n");
 173                 if (search && name && strcmp(_gr_group.gr_name, name))
 174                         continue;
 175                 _gr_group.gr_passwd = strsep(&bp, ":\n");
 176                 if (!(cp = strsep(&bp, ":\n")))
 177                         continue;
 178                 _gr_group.gr_gid = atoi(cp);
 179                 if (search && name == NULL && _gr_group.gr_gid != gid)
 180                         continue;
 181                 cp = NULL;
 182                 for (m = _gr_group.gr_mem = members;; bp++) {
 183                         if (m == &members[MAXGRP - 1])
 184                                 break;
 185                         if (*bp == ',') {
 186                                 if (cp) {
 187                                         *bp = '\0';
 188                                         *m++ = cp;
 189                                         cp = NULL;
 190                                 }
 191                         } else if (*bp == '\0' || *bp == '\n' || *bp == ' ') {
 192                                 if (cp) {
 193                                         *bp = '\0';
 194                                         *m++ = cp;
 195                         }
 196                                 break;
 197                         } else if (cp == NULL)
 198                                 cp = bp;
 199                 }
 200                 *m = NULL;
 201                 return(1);
 202         }
 203         /* NOTREACHED */
 204 }