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"
44 static FILE *uf = NULL;
47 static _Thread_local FILE *uf = NULL;
48 static _Thread_local int udb;
52 setutxdb(int db, const char *file)
59 file = _PATH_UTX_ACTIVE;
63 file = _PATH_UTX_LASTLOGIN;
76 uf = fopen(file, "re");
80 if (db != UTXDB_LOG) {
81 /* Safety check: never use broken files. */
82 if (_fstat(fileno(uf), &sb) != -1 &&
83 sb.st_size % sizeof(struct futx) != 0) {
89 /* Prevent reading of partial records. */
90 (void)setvbuf(uf, NULL, _IOFBF,
91 rounddown(BUFSIZ, sizeof(struct futx)));
102 setutxdb(UTXDB_ACTIVE, NULL);
116 getfutxent(struct futx *fu)
124 if (udb == UTXDB_LOG) {
128 if (fread(&len, sizeof(len), 1, uf) != 1)
133 * XXX: Though zero-size records are valid in theory,
134 * they can never occur in practice. Zero-size records
135 * indicate file corruption. Seek one byte forward, to
136 * see if we can find a record there.
141 if (len > sizeof *fu) {
142 /* Forward compatibility. */
143 if (fread(fu, sizeof(*fu), 1, uf) != 1)
145 fseek(uf, len - sizeof(*fu), SEEK_CUR);
147 /* Partial record. */
148 memset(fu, 0, sizeof(*fu));
149 if (fread(fu, len, 1, uf) != 1)
153 if (fread(fu, sizeof(*fu), 1, uf) != 1)
164 if (getfutxent(&fu) != 0)
166 return (futx_to_utx(&fu));
170 getutxid(const struct utmpx *id)
175 if (getfutxent(&fu) != 0)
178 switch (fu.fu_type) {
183 switch (id->ut_type) {
188 if (memcmp(fu.fu_id, id->ut_id,
189 MIN(sizeof(fu.fu_id), sizeof(id->ut_id))) ==
195 if (fu.fu_type == id->ut_type)
202 return (futx_to_utx(&fu));
206 getutxline(const struct utmpx *line)
211 if (getfutxent(&fu) != 0)
214 switch (fu.fu_type) {
217 if (strncmp(fu.fu_line, line->ut_line,
218 MIN(sizeof(fu.fu_line), sizeof(line->ut_line))) ==
226 return (futx_to_utx(&fu));
230 getutxuser(const char *user)
235 if (getfutxent(&fu) != 0)
238 switch (fu.fu_type) {
240 if (strncmp(fu.fu_user, user, sizeof(fu.fu_user)) == 0)
247 return (futx_to_utx(&fu));