2 * Copyright (c) 1989 - 1994, Julianne Frances Haugh
3 * Copyright (c) 1996 - 1998, Marek Michałkiewicz
4 * Copyright (c) 2003 - 2005, Tomasz Kłoczko
5 * Copyright (c) 2008 , Nicolas François
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 * 3. The name of the copyright holders or contributors may not be used to
17 * endorse or promote products derived from this software without
18 * specific prior written permission.
20 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
21 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
22 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
23 * PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
24 * HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
25 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
26 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
27 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
28 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
29 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
30 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
37 #include <sys/types.h>
43 #include "prototypes.h"
46 * dolastlog - create lastlog entry
48 * A "last login" entry is created for the user being logged in. The
49 * UID is extracted from the global (struct passwd) entry and the
50 * TTY information is gotten from the (struct utmp).
54 const struct passwd *pw,
55 /*@unique@*/const char *line,
56 /*@unique@*/const char *host)
60 struct lastlog newlog;
64 * If the file does not exist, don't create it.
67 fd = open (LASTLOG_FILE, O_RDWR);
73 * The file is indexed by UID number. Seek to the record
74 * for this UID. Negative UID's will create problems, but ...
77 offset = (off_t) pw->pw_uid * sizeof newlog;
79 if (lseek (fd, offset, SEEK_SET) != offset) {
81 "Can't read last lastlog entry for UID %lu in %s. Entry not updated.",
82 (unsigned long) pw->pw_uid, LASTLOG_FILE));
88 * Read the old entry so we can tell the user when they last
89 * logged in. Then construct the new entry and write it out
90 * the way we read the old one in.
93 if (read (fd, (void *) &newlog, sizeof newlog) != (ssize_t) sizeof newlog) {
94 memzero (&newlog, sizeof newlog);
100 ll_time = newlog.ll_time;
101 (void) time (&ll_time);
102 newlog.ll_time = ll_time;
103 strncpy (newlog.ll_line, line, sizeof newlog.ll_line);
105 strncpy (newlog.ll_host, host, sizeof newlog.ll_host);
107 if ( (lseek (fd, offset, SEEK_SET) != offset)
108 || (write (fd, (const void *) &newlog, sizeof newlog) != (ssize_t) sizeof newlog)
109 || (close (fd) != 0)) {
111 "Can't write lastlog entry for UID %lu in %s.",
112 (unsigned long) pw->pw_uid, LASTLOG_FILE));