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15637ed4 RG |
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; | |
28e48405 | 161 | _pw_db = dbopen(p, O_RDONLY, 0, DB_HASH, NULL); |
15637ed4 RG |
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 | } |