1 /* $NetBSD: getgrent.c,v 1.4 2001/06/15 17:26:51 tsutsui Exp $ */ 2 3 /* 4 * Copyright (c) 1989, 1993 5 * The Regents of the University of California. All rights reserved. 6 * Portions Copyright (c) 1994, Jason Downs. All Rights Reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. All advertising materials mentioning features or use of this software 17 * must display the following acknowledgement: 18 * This product includes software developed by the University of 19 * California, Berkeley and its contributors. 20 * 4. Neither the name of the University nor the names of its contributors 21 * may be used to endorse or promote products derived from this software 22 * without specific prior written permission. 23 * 24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 27 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 34 * SUCH DAMAGE. 35 */ 36 37 /* 38 * Copied from: lib/libc/gen/getgrent.c 39 * and then gutted, leaving only /etc/group support. 40 */ 41 42 #include <sys/cdefs.h> 43 44 #ifdef __weak_alias 45 #define endgrent _endgrent 46 #define getgrent _getgrent 47 #define getgrgid _getgrgid 48 #define getgrnam _getgrnam 49 #define setgrent _setgrent 50 #define setgroupent _setgroupent 51 #endif 52 53 #include <sys/types.h> 54 #include <stdio.h> 55 #include <stdlib.h> 56 #include <string.h> 57 #include <grp.h> 58 59 #ifdef __weak_alias 60 __weak_alias(endgrent,_endgrent) 61 __weak_alias(getgrent,_getgrent) 62 __weak_alias(getgrgid,_getgrgid) 63 __weak_alias(getgrnam,_getgrnam) 64 __weak_alias(setgrent,_setgrent) 65 __weak_alias(setgroupent,_setgroupent) 66 #endif 67 68 static FILE *_gr_fp; 69 static struct group _gr_group; 70 static int _gr_stayopen; 71 static int grscan __P((int, int, const char *)); 72 static int start_gr __P((void)); 73 74 #define MAXGRP 200 75 static char *members[MAXGRP]; 76 #define MAXLINELENGTH 1024 77 static char line[MAXLINELENGTH]; 78 79 struct group * 80 getgrent() 81 { 82 if ((!_gr_fp && !start_gr()) || !grscan(0, 0, NULL)) 83 return(NULL); 84 return(&_gr_group); 85 } 86 87 struct group * 88 getgrnam(name) 89 const char *name; 90 { 91 int rval; 92 93 if (!start_gr()) 94 return(NULL); 95 rval = grscan(1, 0, name); 96 if (!_gr_stayopen) 97 endgrent(); 98 return(rval ? &_gr_group : NULL); 99 } 100 101 struct group * 102 #ifdef __STDC__ 103 getgrgid(gid_t gid) 104 #else 105 getgrgid(gid) 106 gid_t gid; 107 #endif 108 { 109 int rval; 110 111 if (!start_gr()) 112 return(NULL); 113 rval = grscan(1, gid, NULL); 114 if (!_gr_stayopen) 115 endgrent(); 116 return(rval ? &_gr_group : NULL); 117 } 118 119 static int 120 start_gr() 121 { 122 if (_gr_fp) { 123 rewind(_gr_fp); 124 return(1); 125 } 126 return((_gr_fp = fopen(_PATH_GROUP, "r")) ? 1 : 0); 127 } 128 129 void 130 setgrent() 131 { 132 (void) setgroupent(0); 133 } 134 135 int 136 setgroupent(stayopen) 137 int stayopen; 138 { 139 if (!start_gr()) 140 return(0); 141 _gr_stayopen = stayopen; 142 return(1); 143 } 144 145 void 146 endgrent() 147 { 148 if (_gr_fp) { 149 (void)fclose(_gr_fp); 150 _gr_fp = NULL; 151 } 152 } 153 154 static int 155 grscan(search, gid, name) 156 register int search, gid; 157 register const char *name; 158 { 159 register char *cp, **m; 160 char *bp; 161 162 for (;;) { 163 if (!fgets(line, sizeof(line), _gr_fp)) 164 return(0); 165 bp = line; 166 /* skip lines that are too big */ 167 if (!strchr(line, '\n')) { 168 int ch; 169 170 while ((ch = getc(_gr_fp)) != '\n' && ch != EOF) 171 ; 172 continue; 173 } 174 _gr_group.gr_name = strsep(&bp, ":\n"); 175 if (search && name && strcmp(_gr_group.gr_name, name)) 176 continue; 177 _gr_group.gr_passwd = strsep(&bp, ":\n"); 178 if (!(cp = strsep(&bp, ":\n"))) 179 continue; 180 _gr_group.gr_gid = atoi(cp); 181 if (search && name == NULL && _gr_group.gr_gid != gid) 182 continue; 183 cp = NULL; 184 if (bp == NULL) 185 continue; 186 for (m = _gr_group.gr_mem = members;; bp++) { 187 if (m == &members[MAXGRP - 1]) 188 break; 189 if (*bp == ',') { 190 if (cp) { 191 *bp = '\0'; 192 *m++ = cp; 193 cp = NULL; 194 } 195 } else if (*bp == '\0' || *bp == '\n' || *bp == ' ') { 196 if (cp) { 197 *bp = '\0'; 198 *m++ = cp; 199 } 200 break; 201 } else if (cp == NULL) 202 cp = bp; 203 } 204 *m = NULL; 205 return(1); 206 } 207 /* NOTREACHED */ 208 } 209