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 1.2 2003/06/17 04:27:07 dillon 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 FILE *_gr_fp; 50 static struct group _gr_group; 51 static int _gr_stayopen; 52 static int grscan(), start_gr(); 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() 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() 74 { 75 return 1; 76 } 77 78 int 79 _setgroupent(stayopen) 80 int stayopen; 81 { 82 if (!start_gr()) 83 return(0); 84 _gr_stayopen = stayopen; 85 return(1); 86 } 87 88 int 89 _setgrent() 90 { 91 return(_setgroupent(0)); 92 } 93 94 void 95 _endgrent() 96 { 97 if (_gr_fp) { 98 (void)fclose(_gr_fp); 99 _gr_fp = NULL; 100 } 101 } 102 103 static int 104 grscan(search, gid, name) 105 register int search, gid; 106 register char *name; 107 { 108 register 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 (!index(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; 126 127 if (search && name) { 128 if(strcmp(_gr_group.gr_name, name)) { 129 continue; 130 } 131 } 132 if ((_gr_group.gr_passwd = strsep(&bp, ":\n")) == NULL) 133 break;; 134 if (!(cp = strsep(&bp, ":\n"))) 135 continue; 136 _gr_group.gr_gid = atoi(cp); 137 if (search && name == NULL && _gr_group.gr_gid != gid) 138 continue; 139 cp = NULL; 140 if (bp == NULL) /* !! Must check for this! */ 141 break; 142 for (m = _gr_group.gr_mem = members;; bp++) { 143 if (m == &members[MAXGRP - 1]) 144 break; 145 if (*bp == ',') { 146 if (cp) { 147 *bp = '\0'; 148 *m++ = cp; 149 cp = NULL; 150 } 151 } else if (*bp == '\0' || *bp == '\n' || *bp == ' ') { 152 if (cp) { 153 *bp = '\0'; 154 *m++ = cp; 155 } 156 break; 157 } else if (cp == NULL) 158 cp = bp; 159 } 160 *m = NULL; 161 return(1); 162 } 163 /* NOTREACHED */ 164 return (0); 165 } 166