2 * Copyright (c) 2010 Ed Schouten <ed@FreeBSD.org>
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
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.
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 #include <sys/cdefs.h>
28 __FBSDID("$FreeBSD$");
30 #include "namespace.h"
31 #include <sys/endian.h>
41 #include "un-namespace.h"
44 futx_open(const char *file)
50 fd = _open(file, O_CREAT|O_RDWR|O_EXLOCK, 0644);
54 /* Safety check: never use broken files. */
55 if (_fstat(fd, &sb) != -1 && sb.st_size % sizeof(struct futx) != 0) {
61 fp = fdopen(fd, "r+");
70 utx_active_add(const struct futx *fu)
81 * Register user login sessions. Overwrite entries of sessions
82 * that have already been terminated.
84 fp = futx_open(_PATH_UTX_ACTIVE);
87 while (fread(&fe, sizeof(fe), 1, fp) == 1) {
93 /* Overwrite when ut_id matches. */
94 if (memcmp(fu->fu_id, fe.fu_id, sizeof(fe.fu_id)) ==
96 ret = fseeko(fp, -(off_t)sizeof(fe), SEEK_CUR);
99 if (fe.fu_type != DEAD_PROCESS)
103 /* Allow us to overwrite unused records. */
105 partial = ftello(fp);
107 * Distinguish errors from valid values so we
108 * don't overwrite good data by accident.
111 partial -= (off_t)sizeof(fe);
118 * No exact match found. Use the partial match. If no partial
119 * match was found, just append a new record.
122 ret = fseeko(fp, partial, SEEK_SET);
126 else if (fwrite(fu, sizeof(*fu), 1, fp) < 1)
132 return (error == 0 ? 0 : 1);
136 utx_active_remove(struct futx *fu)
143 * Remove user login sessions, having the same ut_id.
145 fp = futx_open(_PATH_UTX_ACTIVE);
150 while (fread(&fe, sizeof(fe), 1, fp) == 1 && ret != 0)
151 switch (fe.fu_type) {
155 if (memcmp(fu->fu_id, fe.fu_id, sizeof(fe.fu_id)) != 0)
158 /* Terminate session. */
159 if (fseeko(fp, -(off_t)sizeof(fe), SEEK_CUR) == -1)
161 else if (fwrite(fu, sizeof(*fu), 1, fp) < 1)
174 utx_active_purge(void)
177 truncate(_PATH_UTX_ACTIVE, 0);
181 utx_lastlogin_add(const struct futx *fu)
190 * Write an entry to lastlogin. Overwrite the entry if the
191 * current user already has an entry. If not, append a new
194 fp = futx_open(_PATH_UTX_LASTLOGIN);
197 while (fread(&fe, sizeof fe, 1, fp) == 1) {
198 if (strncmp(fu->fu_user, fe.fu_user, sizeof fe.fu_user) != 0)
201 /* Found a previous lastlogin entry for this user. */
202 ret = fseeko(fp, -(off_t)sizeof fe, SEEK_CUR);
207 else if (fwrite(fu, sizeof *fu, 1, fp) < 1) {
217 utx_lastlogin_upgrade(void)
222 fd = _open(_PATH_UTX_LASTLOGIN, O_RDWR, 0644);
227 * Truncate broken lastlogin files. In the future we should
228 * check for older versions of the file format here and try to
231 if (_fstat(fd, &sb) != -1 && sb.st_size % sizeof(struct futx) != 0)
237 utx_log_add(const struct futx *fu)
244 * Append an entry to the log file. We only need to append
245 * records to this file, so to conserve space, trim any trailing
246 * zero-bytes. Prepend a length field, indicating the length of
247 * the record, excluding the length field itself.
249 for (l = sizeof(*fu); l > 0 && ((const char *)fu)[l - 1] == '\0'; l--) ;
250 vec[0].iov_base = &l;
251 vec[0].iov_len = sizeof(l);
252 vec[1].iov_base = __DECONST(void *, fu);
256 fd = _open(_PATH_UTX_LOG, O_CREAT|O_WRONLY|O_APPEND, 0644);
259 if (_writev(fd, vec, 2) == -1)
265 return (error == 0 ? 0 : 1);
269 pututxline(const struct utmpx *utmpx)
276 utx_to_futx(utmpx, &fu);
278 switch (fu.fu_type) {
282 utx_lastlogin_upgrade();
288 bad |= utx_active_add(&fu);
289 bad |= utx_lastlogin_add(&fu);
291 #if 0 /* XXX: Are these records of any use to us? */
294 bad |= utx_active_add(&fu);
299 * In case writing a logout entry fails, never attempt
300 * to write it to utx.log. The logout entry's ut_id
303 if (utx_active_remove(&fu) != 0)
311 bad |= utx_log_add(&fu);
312 return (bad ? NULL : futx_to_utx(&fu));