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 static const char rcsid[] = 37 "$FreeBSD$"; 38 #endif /* not lint */ 39 40 /* 41 * This is a slightly modified chunk of getgrent(3). All the YP support 42 * and unneeded functions have been stripped out. 43 */ 44 45 #include <sys/types.h> 46 #include <grp.h> 47 #include <stdio.h> 48 #include <stdlib.h> 49 #include <string.h> 50 51 FILE *_gr_fp; 52 static struct group _gr_group; 53 static int _gr_stayopen; 54 static int grscan(int, int); 55 static int start_gr(void); 56 57 #define MAXGRP 200 58 static char *members[MAXGRP]; 59 #define MAXLINELENGTH 1024 60 static char line[MAXLINELENGTH]; 61 62 struct group * 63 _getgrent(void) 64 { 65 if (!_gr_fp && !start_gr()) { 66 return NULL; 67 } 68 69 70 if (!grscan(0, 0)) 71 return(NULL); 72 return(&_gr_group); 73 } 74 75 static int 76 start_gr(void) 77 { 78 return 1; 79 } 80 81 int 82 _setgroupent(int stayopen) 83 { 84 if (!start_gr()) 85 return(0); 86 _gr_stayopen = stayopen; 87 return(1); 88 } 89 90 int 91 _setgrent(void) 92 { 93 return(_setgroupent(0)); 94 } 95 96 void 97 _endgrent(void) 98 { 99 if (_gr_fp) { 100 (void)fclose(_gr_fp); 101 _gr_fp = NULL; 102 } 103 } 104 105 static int 106 grscan(int search, int gid) 107 { 108 char *cp, **m; 109 char *bp; 110 for (;;) { 111 if (!fgets(line, sizeof(line), _gr_fp)) 112 return(0); 113 bp = line; 114 /* skip lines that are too big */ 115 if (!strchr(line, '\n')) { 116 int ch; 117 118 while ((ch = getc(_gr_fp)) != '\n' && ch != EOF) 119 ; 120 continue; 121 } 122 if ((_gr_group.gr_name = strsep(&bp, ":\n")) == NULL) 123 break; 124 if (_gr_group.gr_name[0] == '+') 125 continue; 126 if ((_gr_group.gr_passwd = strsep(&bp, ":\n")) == NULL) 127 break; 128 if (!(cp = strsep(&bp, ":\n"))) 129 continue; 130 _gr_group.gr_gid = atoi(cp); 131 if (search && _gr_group.gr_gid != gid) 132 continue; 133 cp = NULL; 134 if (bp == NULL) /* !! Must check for this! */ 135 break; 136 for (m = _gr_group.gr_mem = members;; bp++) { 137 if (m == &members[MAXGRP - 1]) 138 break; 139 if (*bp == ',') { 140 if (cp) { 141 *bp = '\0'; 142 *m++ = cp; 143 cp = NULL; 144 } 145 } else if (*bp == '\0' || *bp == '\n' || *bp == ' ') { 146 if (cp) { 147 *bp = '\0'; 148 *m++ = cp; 149 } 150 break; 151 } else if (cp == NULL) 152 cp = bp; 153 } 154 *m = NULL; 155 return(1); 156 } 157 /* NOTREACHED */ 158 return (0); 159 } 160