2 * Author: Tatu Ylonen <ylo@cs.hut.fi>
3 * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
5 * This file performs some of the things login(1) normally does. We cannot
6 * easily use something like login -p -h host -f user, because there are
7 * several different logins around, and it is hard to determined what kind of
8 * login the current system has. Also, we want to be able to execute commands
11 * As far as I am concerned, the code I have written for this software
12 * can be used freely for any purpose. Any derived versions of this
13 * software must be clearly marked as such, and if the derived work is
14 * incompatible with the protocol description in the RFC file, it must be
15 * called by a name other than "ssh" or "Secure Shell".
17 * Copyright (c) 1999 Theo de Raadt. All rights reserved.
18 * Copyright (c) 1999 Markus Friedl. All rights reserved.
20 * Redistribution and use in source and binary forms, with or without
21 * modification, are permitted provided that the following conditions
23 * 1. Redistributions of source code must retain the above copyright
24 * notice, this list of conditions and the following disclaimer.
25 * 2. Redistributions in binary form must reproduce the above copyright
26 * notice, this list of conditions and the following disclaimer in the
27 * documentation and/or other materials provided with the distribution.
29 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
30 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
31 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
32 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
33 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
34 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
35 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
36 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
37 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
38 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
42 RCSID("$OpenBSD: sshlogin.c,v 1.2 2001/03/24 16:43:27 stevesk Exp $");
51 * Returns the time when the user last logged in. Returns 0 if the
52 * information is not available. This must be called before record_login.
53 * The host the user logged in from will be returned in buf.
57 get_last_login_time(uid_t uid, const char *logname,
58 char *buf, u_int bufsize)
64 lastlog = _PATH_LASTLOG;
67 fd = open(lastlog, O_RDONLY);
70 lseek(fd, (off_t) ((long) uid * sizeof(ll)), SEEK_SET);
71 if (read(fd, &ll, sizeof(ll)) != sizeof(ll)) {
76 if (bufsize > sizeof(ll.ll_host) + 1)
77 bufsize = sizeof(ll.ll_host) + 1;
78 strncpy(buf, ll.ll_host, bufsize - 1);
84 * Records that the user has logged in. I these parts of operating systems
85 * were more standardized.
89 record_login(pid_t pid, const char *ttyname, const char *user, uid_t uid,
90 const char *host, struct sockaddr * addr)
97 /* Construct an utmp/wtmp entry. */
98 memset(&u, 0, sizeof(u));
99 strncpy(u.ut_line, ttyname + 5, sizeof(u.ut_line));
100 u.ut_time = time(NULL);
101 strncpy(u.ut_name, user, sizeof(u.ut_name));
102 realhostname_sa(u.ut_host, sizeof(u.ut_host), addr, addr->sa_len);
105 lastlog = _PATH_LASTLOG;
107 /* Update lastlog unless actually recording a logout. */
108 if (strcmp(user, "") != 0) {
110 * It is safer to bzero the lastlog structure first because
111 * some systems might have some extra fields in it (e.g. SGI)
113 memset(&ll, 0, sizeof(ll));
115 /* Update lastlog. */
116 ll.ll_time = time(NULL);
117 strncpy(ll.ll_line, ttyname + 5, sizeof(ll.ll_line));
118 strncpy(ll.ll_host, host, sizeof(ll.ll_host));
119 fd = open(lastlog, O_RDWR);
121 lseek(fd, (off_t) ((long) uid * sizeof(ll)), SEEK_SET);
122 if (write(fd, &ll, sizeof(ll)) != sizeof(ll))
123 log("Could not write %.100s: %.100s", lastlog, strerror(errno));
129 /* Records that the user has logged out. */
132 record_logout(pid_t pid, const char *ttyname)
134 const char *line = ttyname + 5; /* /dev/ttyq8 -> ttyq8 */
136 logwtmp(line, "", "");