getpwent.c revision 1.1.1.3
1 /* 2 * Copyright (c) 1988, 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 #if defined(LIBC_SCCS) && !defined(lint) 35 static char sccsid[] = "@(#)getpwent.c 8.2 (Berkeley) 4/27/95"; 36 #endif /* LIBC_SCCS and not lint */ 37 38 #include <sys/param.h> 39 #include <fcntl.h> 40 #include <db.h> 41 #include <syslog.h> 42 #include <pwd.h> 43 #include <utmp.h> 44 #include <errno.h> 45 #include <unistd.h> 46 #include <stdlib.h> 47 #include <string.h> 48 #include <limits.h> 49 50 /* 51 * The lookup techniques and data extraction code here must be kept 52 * in sync with that in `pwd_mkdb'. 53 */ 54 55 static struct passwd _pw_passwd; /* password structure */ 56 static DB *_pw_db; /* password database */ 57 static int _pw_keynum; /* key counter */ 58 static int _pw_stayopen; /* keep fd's open */ 59 static int __hashpw(), __initdb(); 60 61 struct passwd * 62 getpwent() 63 { 64 DBT key; 65 char bf[sizeof(_pw_keynum) + 1]; 66 67 if (!_pw_db && !__initdb()) 68 return((struct passwd *)NULL); 69 70 ++_pw_keynum; 71 bf[0] = _PW_KEYBYNUM; 72 bcopy((char *)&_pw_keynum, bf + 1, sizeof(_pw_keynum)); 73 key.data = (u_char *)bf; 74 key.size = sizeof(_pw_keynum) + 1; 75 return(__hashpw(&key) ? &_pw_passwd : (struct passwd *)NULL); 76 } 77 78 struct passwd * 79 getpwnam(name) 80 const char *name; 81 { 82 DBT key; 83 int len, rval; 84 char bf[UT_NAMESIZE + 1]; 85 86 if (!_pw_db && !__initdb()) 87 return((struct passwd *)NULL); 88 89 bf[0] = _PW_KEYBYNAME; 90 len = strlen(name); 91 bcopy(name, bf + 1, MIN(len, UT_NAMESIZE)); 92 key.data = (u_char *)bf; 93 key.size = len + 1; 94 rval = __hashpw(&key); 95 96 if (!_pw_stayopen) { 97 (void)(_pw_db->close)(_pw_db); 98 _pw_db = (DB *)NULL; 99 } 100 return(rval ? &_pw_passwd : (struct passwd *)NULL); 101 } 102 103 struct passwd * 104 getpwuid(uid) 105 uid_t uid; 106 { 107 DBT key; 108 int keyuid, rval; 109 char bf[sizeof(keyuid) + 1]; 110 111 if (!_pw_db && !__initdb()) 112 return((struct passwd *)NULL); 113 114 bf[0] = _PW_KEYBYUID; 115 keyuid = uid; 116 bcopy(&keyuid, bf + 1, sizeof(keyuid)); 117 key.data = (u_char *)bf; 118 key.size = sizeof(keyuid) + 1; 119 rval = __hashpw(&key); 120 121 if (!_pw_stayopen) { 122 (void)(_pw_db->close)(_pw_db); 123 _pw_db = (DB *)NULL; 124 } 125 return(rval ? &_pw_passwd : (struct passwd *)NULL); 126 } 127 128 int 129 setpassent(stayopen) 130 int stayopen; 131 { 132 _pw_keynum = 0; 133 _pw_stayopen = stayopen; 134 return(1); 135 } 136 137 int 138 setpwent() 139 { 140 _pw_keynum = 0; 141 _pw_stayopen = 0; 142 return(1); 143 } 144 145 void 146 endpwent() 147 { 148 _pw_keynum = 0; 149 if (_pw_db) { 150 (void)(_pw_db->close)(_pw_db); 151 _pw_db = (DB *)NULL; 152 } 153 } 154 155 static 156 __initdb() 157 { 158 static int warned; 159 char *p; 160 161 p = (geteuid()) ? _PATH_MP_DB : _PATH_SMP_DB; 162 _pw_db = dbopen(p, O_RDONLY, 0, DB_HASH, NULL); 163 if (_pw_db) 164 return(1); 165 if (!warned) 166 syslog(LOG_ERR, "%s: %m", p); 167 return(0); 168 } 169 170 static 171 __hashpw(key) 172 DBT *key; 173 { 174 register char *p, *t; 175 static u_int max; 176 static char *line; 177 DBT data; 178 179 if ((_pw_db->get)(_pw_db, key, &data, 0)) 180 return(0); 181 p = (char *)data.data; 182 if (data.size > max && !(line = realloc(line, max += 1024))) 183 return(0); 184 185 /* THIS CODE MUST MATCH THAT IN pwd_mkdb. */ 186 t = line; 187 #define EXPAND(e) e = t; while (*t++ = *p++); 188 #define SCALAR(v) memmove(&(v), p, sizeof v); p += sizeof v 189 EXPAND(_pw_passwd.pw_name); 190 EXPAND(_pw_passwd.pw_passwd); 191 SCALAR(_pw_passwd.pw_uid); 192 SCALAR(_pw_passwd.pw_gid); 193 SCALAR(_pw_passwd.pw_change); 194 EXPAND(_pw_passwd.pw_class); 195 EXPAND(_pw_passwd.pw_gecos); 196 EXPAND(_pw_passwd.pw_dir); 197 EXPAND(_pw_passwd.pw_shell); 198 SCALAR(_pw_passwd.pw_expire); 199 return(1); 200 } 201
Indexes created Tue Sep 30 11:09:46 GMT 2025