getpwent.c revision 1.1.1.1
1 /* 2 * Copyright (c) 1988 The Regents of the University of California. 3 * 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 5.21 (Berkeley) 3/14/91"; 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 static struct passwd _pw_passwd; /* password structure */ 51 static DB *_pw_db; /* password database */ 52 static int _pw_keynum; /* key counter */ 53 static int _pw_stayopen; /* keep fd's open */ 54 static int __hashpw(), __initdb(); 55 56 struct passwd * 57 getpwent() 58 { 59 DBT key; 60 char bf[sizeof(_pw_keynum) + 1]; 61 62 if (!_pw_db && !__initdb()) 63 return((struct passwd *)NULL); 64 65 ++_pw_keynum; 66 bf[0] = _PW_KEYBYNUM; 67 bcopy((char *)&_pw_keynum, bf + 1, sizeof(_pw_keynum)); 68 key.data = (u_char *)bf; 69 key.size = sizeof(_pw_keynum) + 1; 70 return(__hashpw(&key) ? &_pw_passwd : (struct passwd *)NULL); 71 } 72 73 struct passwd * 74 getpwnam(name) 75 const char *name; 76 { 77 DBT key; 78 int len, rval; 79 char bf[UT_NAMESIZE + 1]; 80 81 if (!_pw_db && !__initdb()) 82 return((struct passwd *)NULL); 83 84 bf[0] = _PW_KEYBYNAME; 85 len = strlen(name); 86 bcopy(name, bf + 1, MIN(len, UT_NAMESIZE)); 87 key.data = (u_char *)bf; 88 key.size = len + 1; 89 rval = __hashpw(&key); 90 91 if (!_pw_stayopen) { 92 (void)(_pw_db->close)(_pw_db); 93 _pw_db = (DB *)NULL; 94 } 95 return(rval ? &_pw_passwd : (struct passwd *)NULL); 96 } 97 98 struct passwd * 99 #ifdef __STDC__ 100 getpwuid(uid_t uid) 101 #else 102 getpwuid(uid) 103 int uid; 104 #endif 105 { 106 DBT key; 107 int keyuid, rval; 108 char bf[sizeof(keyuid) + 1]; 109 110 if (!_pw_db && !__initdb()) 111 return((struct passwd *)NULL); 112 113 bf[0] = _PW_KEYBYUID; 114 keyuid = uid; 115 bcopy(&keyuid, bf + 1, sizeof(keyuid)); 116 key.data = (u_char *)bf; 117 key.size = sizeof(keyuid) + 1; 118 rval = __hashpw(&key); 119 120 if (!_pw_stayopen) { 121 (void)(_pw_db->close)(_pw_db); 122 _pw_db = (DB *)NULL; 123 } 124 return(rval ? &_pw_passwd : (struct passwd *)NULL); 125 } 126 127 int 128 setpassent(stayopen) 129 int stayopen; 130 { 131 _pw_keynum = 0; 132 _pw_stayopen = stayopen; 133 return(1); 134 } 135 136 int 137 setpwent() 138 { 139 _pw_keynum = 0; 140 _pw_stayopen = 0; 141 return(1); 142 } 143 144 void 145 endpwent() 146 { 147 _pw_keynum = 0; 148 if (_pw_db) { 149 (void)(_pw_db->close)(_pw_db); 150 _pw_db = (DB *)NULL; 151 } 152 } 153 154 static 155 __initdb() 156 { 157 static int warned; 158 char *p; 159 160 p = (geteuid()) ? _PATH_MP_DB : _PATH_SMP_DB; 161 _pw_db = hash_open(p, O_RDONLY, 0, NULL); 162 if (_pw_db) 163 return(1); 164 if (!warned) 165 syslog(LOG_ERR, "%s: %m", p); 166 return(0); 167 } 168 169 static 170 __hashpw(key) 171 DBT *key; 172 { 173 register char *p, *t; 174 static u_int max; 175 static char *line; 176 DBT data; 177 178 if ((_pw_db->get)(_pw_db, key, &data, 0)) 179 return(0); 180 p = (char *)data.data; 181 if (data.size > max && !(line = realloc(line, max += 1024))) 182 return(0); 183 184 t = line; 185 #define EXPAND(e) e = t; while (*t++ = *p++); 186 EXPAND(_pw_passwd.pw_name); 187 EXPAND(_pw_passwd.pw_passwd); 188 bcopy(p, (char *)&_pw_passwd.pw_uid, sizeof(int)); 189 p += sizeof(int); 190 bcopy(p, (char *)&_pw_passwd.pw_gid, sizeof(int)); 191 p += sizeof(int); 192 bcopy(p, (char *)&_pw_passwd.pw_change, sizeof(time_t)); 193 p += sizeof(time_t); 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 bcopy(p, (char *)&_pw_passwd.pw_expire, sizeof(time_t)); 199 p += sizeof(time_t); 200 return(1); 201 } 202
Indexes created Tue Sep 30 11:09:46 GMT 2025