getpwent.c revision 1.7
1 /* $NetBSD: getpwent.c,v 1.7 2003/08/07 09:27:57 agc Exp $ */ 2 3 /* 4 * Copyright (c) 1987, 1988, 1989, 1993, 1994, 1995 5 * The Regents of the University of California. All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. Neither the name of the University nor the names of its contributors 16 * may be used to endorse or promote products derived from this software 17 * without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 */ 31 32 /* 33 * Copied from: lib/libc/gen/getpwent.c 34 * NetBSD: getpwent.c,v 1.48 2000/10/03 03:22:26 enami Exp 35 * and then gutted, leaving only /etc/master.passwd support. 36 */ 37 38 #include <sys/cdefs.h> 39 40 #ifdef __weak_alias 41 #define endpwent _endpwent 42 #define getpwent _getpwent 43 #define getpwuid _getpwuid 44 #define getpwnam _getpwnam 45 #define setpwent _setpwent 46 #define setpassent _setpassent 47 48 __weak_alias(endpwent,_endpwent) 49 __weak_alias(getpwent,_getpwent) 50 __weak_alias(getpwuid,_getpwuid) 51 __weak_alias(getpwnam,_getpwnam) 52 __weak_alias(setpwent,_setpwent) 53 __weak_alias(setpassent,_setpassent) 54 #endif 55 56 #include <sys/param.h> 57 58 #include <limits.h> 59 #include <pwd.h> 60 #include <stdlib.h> 61 #include <stdio.h> 62 #include <string.h> 63 64 static int pwstart(void); 65 static int pwscan(int, uid_t, const char *); 66 static int pwmatchline(int, uid_t, const char *); 67 68 static FILE *_pw_fp; 69 static struct passwd _pw_passwd; /* password structure */ 70 static int _pw_stayopen; /* keep fd's open */ 71 static int _pw_filesdone; 72 73 #define MAXLINELENGTH 1024 74 75 static char pwline[MAXLINELENGTH]; 76 77 struct passwd * 78 getpwent(void) 79 { 80 81 if ((!_pw_fp && !pwstart()) || !pwscan(0, 0, NULL)) 82 return (NULL); 83 return (&_pw_passwd); 84 } 85 86 struct passwd * 87 getpwnam(const char *name) 88 { 89 int rval; 90 91 if (!pwstart()) 92 return NULL; 93 rval = pwscan(1, 0, name); 94 if (!_pw_stayopen) 95 endpwent(); 96 return (rval) ? &_pw_passwd : NULL; 97 } 98 99 struct passwd * 100 getpwuid(uid_t uid) 101 { 102 int rval; 103 104 if (!pwstart()) 105 return NULL; 106 rval = pwscan(1, uid, NULL); 107 if (!_pw_stayopen) 108 endpwent(); 109 return (rval) ? &_pw_passwd : NULL; 110 } 111 112 void 113 setpwent(void) 114 { 115 116 (void) setpassent(0); 117 } 118 119 int 120 setpassent(int stayopen) 121 { 122 123 if (!pwstart()) 124 return 0; 125 _pw_stayopen = stayopen; 126 return 1; 127 } 128 129 void 130 endpwent(void) 131 { 132 133 _pw_filesdone = 0; 134 if (_pw_fp) { 135 (void)fclose(_pw_fp); 136 _pw_fp = NULL; 137 } 138 } 139 140 static int 141 pwstart(void) 142 { 143 144 _pw_filesdone = 0; 145 if (_pw_fp) { 146 rewind(_pw_fp); 147 return 1; 148 } 149 return (_pw_fp = fopen(_PATH_MASTERPASSWD, "r")) ? 1 : 0; 150 } 151 152 153 static int 154 pwscan(int search, uid_t uid, const char *name) 155 { 156 157 if (_pw_filesdone) 158 return 0; 159 for (;;) { 160 if (!fgets(pwline, sizeof(pwline), _pw_fp)) { 161 if (!search) 162 _pw_filesdone = 1; 163 return 0; 164 } 165 /* skip lines that are too big */ 166 if (!strchr(pwline, '\n')) { 167 int ch; 168 169 while ((ch = getc(_pw_fp)) != '\n' && ch != EOF) 170 ; 171 continue; 172 } 173 if (pwmatchline(search, uid, name)) 174 return 1; 175 } 176 /* NOTREACHED */ 177 } 178 179 static int 180 pwmatchline(int search, uid_t uid, const char *name) 181 { 182 unsigned long id; 183 char *cp, *bp, *ep; 184 185 /* name may be NULL if search is nonzero */ 186 187 bp = pwline; 188 memset(&_pw_passwd, 0, sizeof(_pw_passwd)); 189 _pw_passwd.pw_name = strsep(&bp, ":\n"); /* name */ 190 if (search && name && strcmp(_pw_passwd.pw_name, name)) 191 return 0; 192 193 _pw_passwd.pw_passwd = strsep(&bp, ":\n"); /* passwd */ 194 195 if (!(cp = strsep(&bp, ":\n"))) /* uid */ 196 return 0; 197 id = strtoul(cp, &ep, 10); 198 if (id > UID_MAX || *ep != '\0') 199 return 0; 200 _pw_passwd.pw_uid = (uid_t)id; 201 if (search && name == NULL && _pw_passwd.pw_uid != uid) 202 return 0; 203 204 if (!(cp = strsep(&bp, ":\n"))) /* gid */ 205 return 0; 206 id = strtoul(cp, &ep, 10); 207 if (id > GID_MAX || *ep != '\0') 208 return 0; 209 _pw_passwd.pw_gid = (gid_t)id; 210 211 if (!(_pw_passwd.pw_class = strsep(&bp, ":"))) /* class */ 212 return 0; 213 if (!(ep = strsep(&bp, ":"))) /* change */ 214 return 0; 215 if (!(ep = strsep(&bp, ":"))) /* expire */ 216 return 0; 217 218 if (!(_pw_passwd.pw_gecos = strsep(&bp, ":\n"))) /* gecos */ 219 return 0; 220 if (!(_pw_passwd.pw_dir = strsep(&bp, ":\n"))) /* directory */ 221 return 0; 222 if (!(_pw_passwd.pw_shell = strsep(&bp, ":\n"))) /* shell */ 223 return 0; 224 225 if (strchr(bp, ':') != NULL) 226 return 0; 227 228 return 1; 229 } 230
Indexes created Fri Sep 26 20:09:58 GMT 2025