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. Neither the name of the University nor the names of its contributors 14 * may be used to endorse or promote products derived from this software 15 * without specific prior written permission. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 * 29 * @(#)getgrent.c 8.2 (Berkeley) 3/21/94 30 * $FreeBSD: src/libexec/mknetid/parse_group.c,v 1.6 1999/08/28 00:09:42 peter Exp $ 31 * $DragonFly: src/libexec/mknetid/parse_group.c,v 1.3 2006/08/03 16:40:46 swildner Exp $ 32 */ 33 34 /* 35 * This is a slightly modified chunk of getgrent(3). All the YP support 36 * and unneeded functions have been stripped out. 37 */ 38 39 #include <sys/types.h> 40 #include <grp.h> 41 #include <stdio.h> 42 #include <stdlib.h> 43 #include <string.h> 44 45 struct group *_getgrent(void); 46 int _setgrent(void); 47 void _endgrent(void); 48 FILE *_gr_fp; 49 50 static struct group _gr_group; 51 static int _gr_stayopen; 52 static int grscan(int, gid_t, char *), start_gr(void); 53 54 #define MAXGRP 200 55 static char *members[MAXGRP]; 56 #define MAXLINELENGTH 1024 57 static char line[MAXLINELENGTH]; 58 59 struct group * 60 _getgrent(void) 61 { 62 if (!_gr_fp && !start_gr()) { 63 return NULL; 64 } 65 66 67 if (!grscan(0, 0, NULL)) 68 return(NULL); 69 return(&_gr_group); 70 } 71 72 static int 73 start_gr(void) 74 { 75 return 1; 76 } 77 78 static int 79 _setgroupent(int stayopen) 80 { 81 if (!start_gr()) 82 return(0); 83 _gr_stayopen = stayopen; 84 return(1); 85 } 86 87 int 88 _setgrent(void) 89 { 90 return(_setgroupent(0)); 91 } 92 93 void 94 _endgrent(void) 95 { 96 if (_gr_fp) { 97 (void)fclose(_gr_fp); 98 _gr_fp = NULL; 99 } 100 } 101 102 static int 103 grscan(int search, gid_t gid, char *name) 104 { 105 char *cp, **m; 106 char *bp; 107 for (;;) { 108 if (!fgets(line, sizeof(line), _gr_fp)) 109 return(0); 110 bp = line; 111 /* skip lines that are too big */ 112 if (!index(line, '\n')) { 113 int ch; 114 115 while ((ch = getc(_gr_fp)) != '\n' && ch != EOF) 116 ; 117 continue; 118 } 119 if ((_gr_group.gr_name = strsep(&bp, ":\n")) == NULL) 120 break; 121 if (_gr_group.gr_name[0] == '+') 122 continue; 123 124 if (search && name) { 125 if(strcmp(_gr_group.gr_name, name)) { 126 continue; 127 } 128 } 129 if ((_gr_group.gr_passwd = strsep(&bp, ":\n")) == NULL) 130 break; 131 if (!(cp = strsep(&bp, ":\n"))) 132 continue; 133 _gr_group.gr_gid = atoi(cp); 134 if (search && name == NULL && _gr_group.gr_gid != gid) 135 continue; 136 cp = NULL; 137 if (bp == NULL) /* !! Must check for this! */ 138 break; 139 for (m = _gr_group.gr_mem = members;; bp++) { 140 if (m == &members[MAXGRP - 1]) 141 break; 142 if (*bp == ',') { 143 if (cp) { 144 *bp = '\0'; 145 *m++ = cp; 146 cp = NULL; 147 } 148 } else if (*bp == '\0' || *bp == '\n' || *bp == ' ') { 149 if (cp) { 150 *bp = '\0'; 151 *m++ = cp; 152 } 153 break; 154 } else if (cp == NULL) 155 cp = bp; 156 } 157 *m = NULL; 158 return(1); 159 } 160 /* NOTREACHED */ 161 return (0); 162 } 163