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 #endif /* not lint */ 34 35 /* 36 * This is a slightly modified chunk of getgrent(3). All the YP support 37 * and unneeded functions have been stripped out. 38 */ 39 40 #include <sys/types.h> 41 #include <grp.h> 42 #include <stdio.h> 43 #include <stdlib.h> 44 #include <string.h> 45 46 FILE *_gr_fp; 47 static struct group _gr_group; 48 static int _gr_stayopen; 49 static int grscan(int, int); 50 static int start_gr(void); 51 52 #define MAXGRP 200 53 static char *members[MAXGRP]; 54 #define MAXLINELENGTH 1024 55 static char line[MAXLINELENGTH]; 56 57 struct group * 58 _getgrent(void) 59 { 60 if (!_gr_fp && !start_gr()) { 61 return NULL; 62 } 63 64 65 if (!grscan(0, 0)) 66 return(NULL); 67 return(&_gr_group); 68 } 69 70 static int 71 start_gr(void) 72 { 73 return 1; 74 } 75 76 int 77 _setgroupent(int stayopen) 78 { 79 if (!start_gr()) 80 return(0); 81 _gr_stayopen = stayopen; 82 return(1); 83 } 84 85 int 86 _setgrent(void) 87 { 88 return(_setgroupent(0)); 89 } 90 91 void 92 _endgrent(void) 93 { 94 if (_gr_fp) { 95 (void)fclose(_gr_fp); 96 _gr_fp = NULL; 97 } 98 } 99 100 static int 101 grscan(int search, int gid) 102 { 103 char *cp, **m; 104 char *bp; 105 for (;;) { 106 if (!fgets(line, sizeof(line), _gr_fp)) 107 return(0); 108 bp = line; 109 /* skip lines that are too big */ 110 if (!strchr(line, '\n')) { 111 int ch; 112 113 while ((ch = getc(_gr_fp)) != '\n' && ch != EOF) 114 ; 115 continue; 116 } 117 if ((_gr_group.gr_name = strsep(&bp, ":\n")) == NULL) 118 break; 119 if (_gr_group.gr_name[0] == '+') 120 continue; 121 if ((_gr_group.gr_passwd = strsep(&bp, ":\n")) == NULL) 122 break; 123 if (!(cp = strsep(&bp, ":\n"))) 124 continue; 125 _gr_group.gr_gid = atoi(cp); 126 if (search && _gr_group.gr_gid != gid) 127 continue; 128 cp = NULL; 129 if (bp == NULL) /* !! Must check for this! */ 130 break; 131 for (m = _gr_group.gr_mem = members;; bp++) { 132 if (m == &members[MAXGRP - 1]) 133 break; 134 if (*bp == ',') { 135 if (cp) { 136 *bp = '\0'; 137 *m++ = cp; 138 cp = NULL; 139 } 140 } else if (*bp == '\0' || *bp == '\n' || *bp == ' ') { 141 if (cp) { 142 *bp = '\0'; 143 *m++ = cp; 144 } 145 break; 146 } else if (cp == NULL) 147 cp = bp; 148 } 149 *m = NULL; 150 return(1); 151 } 152 /* NOTREACHED */ 153 return (0); 154 } 155