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 34 #ifndef lint 35 #if 0 36 static const char sccsid[] = "@(#)getgrent.c 8.2 (Berkeley) 3/21/94"; 37 #endif 38 static const char rcsid[] = 39 "$FreeBSD$"; 40 #endif /* not lint */ 41 42 /* 43 * This is a slightly modified chunk of getgrent(3). All the YP support 44 * and unneeded functions have been stripped out. 45 */ 46 47 #include <sys/types.h> 48 #include <grp.h> 49 #include <stdio.h> 50 #include <stdlib.h> 51 #include <string.h> 52 53 FILE *_gr_fp; 54 static struct group _gr_group; 55 static int _gr_stayopen; 56 static int grscan(int, int); 57 static int start_gr(void); 58 59 #define MAXGRP 200 60 static char *members[MAXGRP]; 61 #define MAXLINELENGTH 1024 62 static char line[MAXLINELENGTH]; 63 64 struct group * 65 _getgrent(void) 66 { 67 if (!_gr_fp && !start_gr()) { 68 return NULL; 69 } 70 71 72 if (!grscan(0, 0)) 73 return(NULL); 74 return(&_gr_group); 75 } 76 77 static int 78 start_gr(void) 79 { 80 return 1; 81 } 82 83 int 84 _setgroupent(int stayopen) 85 { 86 if (!start_gr()) 87 return(0); 88 _gr_stayopen = stayopen; 89 return(1); 90 } 91 92 int 93 _setgrent(void) 94 { 95 return(_setgroupent(0)); 96 } 97 98 void 99 _endgrent(void) 100 { 101 if (_gr_fp) { 102 (void)fclose(_gr_fp); 103 _gr_fp = NULL; 104 } 105 } 106 107 static int 108 grscan(int search, int gid) 109 { 110 char *cp, **m; 111 char *bp; 112 for (;;) { 113 if (!fgets(line, sizeof(line), _gr_fp)) 114 return(0); 115 bp = line; 116 /* skip lines that are too big */ 117 if (!strchr(line, '\n')) { 118 int ch; 119 120 while ((ch = getc(_gr_fp)) != '\n' && ch != EOF) 121 ; 122 continue; 123 } 124 if ((_gr_group.gr_name = strsep(&bp, ":\n")) == NULL) 125 break; 126 if (_gr_group.gr_name[0] == '+') 127 continue; 128 if ((_gr_group.gr_passwd = strsep(&bp, ":\n")) == NULL) 129 break; 130 if (!(cp = strsep(&bp, ":\n"))) 131 continue; 132 _gr_group.gr_gid = atoi(cp); 133 if (search && _gr_group.gr_gid != gid) 134 continue; 135 cp = NULL; 136 if (bp == NULL) /* !! Must check for this! */ 137 break; 138 for (m = _gr_group.gr_mem = members;; bp++) { 139 if (m == &members[MAXGRP - 1]) 140 break; 141 if (*bp == ',') { 142 if (cp) { 143 *bp = '\0'; 144 *m++ = cp; 145 cp = NULL; 146 } 147 } else if (*bp == '\0' || *bp == '\n' || *bp == ' ') { 148 if (cp) { 149 *bp = '\0'; 150 *m++ = cp; 151 } 152 break; 153 } else if (cp == NULL) 154 cp = bp; 155 } 156 *m = NULL; 157 return(1); 158 } 159 /* NOTREACHED */ 160 return (0); 161 } 162