2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
4 * Copyright (c) 2010 Ed Schouten <ed@FreeBSD.org>
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
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.
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 #include <sys/cdefs.h>
30 __FBSDID("$FreeBSD$");
32 #include "namespace.h"
33 #include <sys/endian.h>
34 #include <sys/param.h>
41 #include "un-namespace.h"
43 static _Thread_local FILE *uf = NULL;
44 static _Thread_local int udb;
47 setutxdb(int db, const char *file)
54 file = _PATH_UTX_ACTIVE;
58 file = _PATH_UTX_LASTLOGIN;
71 uf = fopen(file, "re");
75 if (db != UTXDB_LOG) {
76 /* Safety check: never use broken files. */
77 if (_fstat(fileno(uf), &sb) != -1 &&
78 sb.st_size % sizeof(struct futx) != 0) {
84 /* Prevent reading of partial records. */
85 (void)setvbuf(uf, NULL, _IOFBF,
86 rounddown(BUFSIZ, sizeof(struct futx)));
97 setutxdb(UTXDB_ACTIVE, NULL);
111 getfutxent(struct futx *fu)
119 if (udb == UTXDB_LOG) {
123 if (fread(&len, sizeof(len), 1, uf) != 1)
128 * XXX: Though zero-size records are valid in theory,
129 * they can never occur in practice. Zero-size records
130 * indicate file corruption. Seek one byte forward, to
131 * see if we can find a record there.
136 if (len > sizeof *fu) {
137 /* Forward compatibility. */
138 if (fread(fu, sizeof(*fu), 1, uf) != 1)
140 fseek(uf, len - sizeof(*fu), SEEK_CUR);
142 /* Partial record. */
143 memset(fu, 0, sizeof(*fu));
144 if (fread(fu, len, 1, uf) != 1)
148 if (fread(fu, sizeof(*fu), 1, uf) != 1)
159 if (getfutxent(&fu) != 0)
161 return (futx_to_utx(&fu));
165 getutxid(const struct utmpx *id)
170 if (getfutxent(&fu) != 0)
173 switch (fu.fu_type) {
178 switch (id->ut_type) {
183 if (memcmp(fu.fu_id, id->ut_id,
184 MIN(sizeof(fu.fu_id), sizeof(id->ut_id))) ==
190 if (fu.fu_type == id->ut_type)
197 return (futx_to_utx(&fu));
201 getutxline(const struct utmpx *line)
206 if (getfutxent(&fu) != 0)
209 switch (fu.fu_type) {
212 if (strncmp(fu.fu_line, line->ut_line,
213 MIN(sizeof(fu.fu_line), sizeof(line->ut_line))) ==
221 return (futx_to_utx(&fu));
225 getutxuser(const char *user)
230 if (getfutxent(&fu) != 0)
233 switch (fu.fu_type) {
235 if (strncmp(fu.fu_user, user, sizeof(fu.fu_user)) == 0)
242 return (futx_to_utx(&fu));