1 /* 2 * Copyright (c) 1989, 1993 3 * The Regents of the University of California. All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. All advertising materials mentioning features or use of this software 14 * must display the following acknowledgement: 15 * This product includes software developed by the University of 16 * California, Berkeley and its contributors. 17 * 4. Neither the name of the University nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 * 33 * @(#)getgrent.c 8.2 (Berkeley) 3/21/94 34 * $FreeBSD: src/libexec/mknetid/parse_group.c,v 1.6 1999/08/28 00:09:42 peter Exp $ 35 * $DragonFly: src/libexec/mknetid/parse_group.c,v 1.3 2006/08/03 16:40:46 swildner Exp $ 36 */ 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 struct group *_getgrent(void); 50 int _setgrent(void); 51 void _endgrent(void); 52 FILE *_gr_fp; 53 54 static struct group _gr_group; 55 static int _gr_stayopen; 56 static int grscan(int, gid_t, char *), start_gr(void); 57 58 #define MAXGRP 200 59 static char *members[MAXGRP]; 60 #define MAXLINELENGTH 1024 61 static char line[MAXLINELENGTH]; 62 63 struct group * 64 _getgrent(void) 65 { 66 if (!_gr_fp && !start_gr()) { 67 return NULL; 68 } 69 70 71 if (!grscan(0, 0, NULL)) 72 return(NULL); 73 return(&_gr_group); 74 } 75 76 static int 77 start_gr(void) 78 { 79 return 1; 80 } 81 82 static int 83 _setgroupent(int stayopen) 84 { 85 if (!start_gr()) 86 return(0); 87 _gr_stayopen = stayopen; 88 return(1); 89 } 90 91 int 92 _setgrent(void) 93 { 94 return(_setgroupent(0)); 95 } 96 97 void 98 _endgrent(void) 99 { 100 if (_gr_fp) { 101 (void)fclose(_gr_fp); 102 _gr_fp = NULL; 103 } 104 } 105 106 static int 107 grscan(int search, gid_t gid, char *name) 108 { 109 char *cp, **m; 110 char *bp; 111 for (;;) { 112 if (!fgets(line, sizeof(line), _gr_fp)) 113 return(0); 114 bp = line; 115 /* skip lines that are too big */ 116 if (!index(line, '\n')) { 117 int ch; 118 119 while ((ch = getc(_gr_fp)) != '\n' && ch != EOF) 120 ; 121 continue; 122 } 123 if ((_gr_group.gr_name = strsep(&bp, ":\n")) == NULL) 124 break; 125 if (_gr_group.gr_name[0] == '+') 126 continue; 127 128 if (search && name) { 129 if(strcmp(_gr_group.gr_name, name)) { 130 continue; 131 } 132 } 133 if ((_gr_group.gr_passwd = strsep(&bp, ":\n")) == NULL) 134 break; 135 if (!(cp = strsep(&bp, ":\n"))) 136 continue; 137 _gr_group.gr_gid = atoi(cp); 138 if (search && name == NULL && _gr_group.gr_gid != gid) 139 continue; 140 cp = NULL; 141 if (bp == NULL) /* !! Must check for this! */ 142 break; 143 for (m = _gr_group.gr_mem = members;; bp++) { 144 if (m == &members[MAXGRP - 1]) 145 break; 146 if (*bp == ',') { 147 if (cp) { 148 *bp = '\0'; 149 *m++ = cp; 150 cp = NULL; 151 } 152 } else if (*bp == '\0' || *bp == '\n' || *bp == ' ') { 153 if (cp) { 154 *bp = '\0'; 155 *m++ = cp; 156 } 157 break; 158 } else if (cp == NULL) 159 cp = bp; 160 } 161 *m = NULL; 162 return(1); 163 } 164 /* NOTREACHED */ 165 return (0); 166 } 167