5 * Author: Tatu Ylonen <ylo@cs.hut.fi>
7 * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
10 * Created: Fri Mar 24 14:51:08 1995 ylo
12 * This file performs some of the things login(1) normally does. We cannot
13 * easily use something like login -p -h host -f user, because there are
14 * several different logins around, and it is hard to determined what kind of
15 * login the current system has. Also, we want to be able to execute commands
34 * Returns the time when the user last logged in. Returns 0 if the
35 * information is not available. This must be called before record_login.
36 * The host the user logged in from will be returned in buf.
40 * Returns the time when the user last logged in (or 0 if no previous login
41 * is found). The name of the host used last time is returned in buf.
45 get_last_login_time(uid_t uid, const char *logname,
46 char *buf, unsigned int bufsize)
52 lastlog = _PATH_LASTLOG;
55 fd = open(lastlog, O_RDONLY);
58 lseek(fd, (off_t) ((long) uid * sizeof(ll)), SEEK_SET);
59 if (read(fd, &ll, sizeof(ll)) != sizeof(ll)) {
64 if (bufsize > sizeof(ll.ll_host) + 1)
65 bufsize = sizeof(ll.ll_host) + 1;
66 strncpy(buf, ll.ll_host, bufsize - 1);
72 * Records that the user has logged in. I these parts of operating systems
73 * were more standardized.
77 record_login(int pid, const char *ttyname, const char *user, uid_t uid,
78 const char *host, struct sockaddr_in * addr)
84 const char *utmp, *wtmp;
86 /* Construct an utmp/wtmp entry. */
87 memset(&u, 0, sizeof(u));
88 strncpy(u.ut_line, ttyname + 5, sizeof(u.ut_line));
89 u.ut_time = time(NULL);
90 strncpy(u.ut_name, user, sizeof(u.ut_name));
91 #ifdef HAVE_HOST_IN_UTMP
92 strncpy(u.ut_host, host, sizeof(u.ut_host));
95 /* Figure out the file names. */
100 lastlog = _PATH_LASTLOG;
102 /* Update lastlog unless actually recording a logout. */
103 if (strcmp(user, "") != 0) {
105 * It is safer to bzero the lastlog structure first because
106 * some systems might have some extra fields in it (e.g. SGI)
108 memset(&ll, 0, sizeof(ll));
110 /* Update lastlog. */
111 ll.ll_time = time(NULL);
112 strncpy(ll.ll_line, ttyname + 5, sizeof(ll.ll_line));
113 strncpy(ll.ll_host, host, sizeof(ll.ll_host));
114 fd = open(lastlog, O_RDWR);
116 lseek(fd, (off_t) ((long) uid * sizeof(ll)), SEEK_SET);
117 if (write(fd, &ll, sizeof(ll)) != sizeof(ll))
118 log("Could not write %.100s: %.100s", lastlog, strerror(errno));
124 /* Records that the user has logged out. */
127 record_logout(int pid, const char *ttyname)
129 #ifdef HAVE_LIBUTIL_LOGIN
130 const char *line = ttyname + 5; /* /dev/ttyq8 -> ttyq8 */
132 logwtmp(line, "", "");
133 #else /* HAVE_LIBUTIL_LOGIN */
134 record_login(pid, ttyname, "", -1, "", NULL);
135 #endif /* HAVE_LIBUTIL_LOGIN */