1 /*- 2 * SPDX-License-Identifier: BSD-3-Clause 3 * 4 * Copyright (c) 1989, 1993 5 * The Regents of the University of California. All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. Neither the name of the University nor the names of its contributors 16 * may be used to endorse or promote products derived from this software 17 * without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 */ 31 32 #ifndef lint 33 #if 0 34 static const char sccsid[] = "@(#)getgrent.c 8.2 (Berkeley) 3/21/94"; 35 #endif 36 #endif /* not lint */ 37 38 /* 39 * This is a slightly modified chunk of getgrent(3). All the YP support 40 * and unneeded functions have been stripped out. 41 */ 42 43 #include <sys/types.h> 44 #include <grp.h> 45 #include <stdio.h> 46 #include <stdlib.h> 47 #include <string.h> 48 49 FILE *_gr_fp; 50 static struct group _gr_group; 51 static int _gr_stayopen; 52 static int grscan(int, int); 53 static int start_gr(void); 54 55 #define MAXGRP 200 56 static char *members[MAXGRP]; 57 #define MAXLINELENGTH 1024 58 static char line[MAXLINELENGTH]; 59 60 struct group * 61 _getgrent(void) 62 { 63 if (!_gr_fp && !start_gr()) { 64 return NULL; 65 } 66 67 68 if (!grscan(0, 0)) 69 return(NULL); 70 return(&_gr_group); 71 } 72 73 static int 74 start_gr(void) 75 { 76 return 1; 77 } 78 79 int 80 _setgroupent(int stayopen) 81 { 82 if (!start_gr()) 83 return(0); 84 _gr_stayopen = stayopen; 85 return(1); 86 } 87 88 int 89 _setgrent(void) 90 { 91 return(_setgroupent(0)); 92 } 93 94 void 95 _endgrent(void) 96 { 97 if (_gr_fp) { 98 (void)fclose(_gr_fp); 99 _gr_fp = NULL; 100 } 101 } 102 103 static int 104 grscan(int search, int gid) 105 { 106 char *cp, **m; 107 char *bp; 108 for (;;) { 109 if (!fgets(line, sizeof(line), _gr_fp)) 110 return(0); 111 bp = line; 112 /* skip lines that are too big */ 113 if (!strchr(line, '\n')) { 114 int ch; 115 116 while ((ch = getc(_gr_fp)) != '\n' && ch != EOF) 117 ; 118 continue; 119 } 120 if ((_gr_group.gr_name = strsep(&bp, ":\n")) == NULL) 121 break; 122 if (_gr_group.gr_name[0] == '+') 123 continue; 124 if ((_gr_group.gr_passwd = strsep(&bp, ":\n")) == NULL) 125 break; 126 if (!(cp = strsep(&bp, ":\n"))) 127 continue; 128 _gr_group.gr_gid = atoi(cp); 129 if (search && _gr_group.gr_gid != gid) 130 continue; 131 cp = NULL; 132 if (bp == NULL) /* !! Must check for this! */ 133 break; 134 for (m = _gr_group.gr_mem = members;; bp++) { 135 if (m == &members[MAXGRP - 1]) 136 break; 137 if (*bp == ',') { 138 if (cp) { 139 *bp = '\0'; 140 *m++ = cp; 141 cp = NULL; 142 } 143 } else if (*bp == '\0' || *bp == '\n' || *bp == ' ') { 144 if (cp) { 145 *bp = '\0'; 146 *m++ = cp; 147 } 148 break; 149 } else if (cp == NULL) 150 cp = bp; 151 } 152 *m = NULL; 153 return(1); 154 } 155 /* NOTREACHED */ 156 return (0); 157 } 158