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
37 * Returns the time when the user last logged in. Returns 0 if the
38 * information is not available. This must be called before record_login.
39 * The host the user logged in from will be returned in buf.
43 * Returns the time when the user last logged in (or 0 if no previous login
44 * is found). The name of the host used last time is returned in buf.
48 get_last_login_time(uid_t uid, const char *logname,
49 char *buf, unsigned int bufsize)
55 lastlog = _PATH_LASTLOG;
58 fd = open(lastlog, O_RDONLY);
61 lseek(fd, (off_t) ((long) uid * sizeof(ll)), SEEK_SET);
62 if (read(fd, &ll, sizeof(ll)) != sizeof(ll)) {
67 if (bufsize > sizeof(ll.ll_host) + 1)
68 bufsize = sizeof(ll.ll_host) + 1;
69 strncpy(buf, ll.ll_host, bufsize - 1);
75 * Records that the user has logged in. I these parts of operating systems
76 * were more standardized.
80 record_login(int pid, const char *ttyname, const char *user, uid_t uid,
81 const char *host, struct sockaddr_in * addr)
87 const char *utmp, *wtmp;
89 /* Construct an utmp/wtmp entry. */
90 memset(&u, 0, sizeof(u));
91 strncpy(u.ut_line, ttyname + 5, sizeof(u.ut_line));
92 u.ut_time = time(NULL);
93 strncpy(u.ut_name, user, sizeof(u.ut_name));
94 #ifdef HAVE_HOST_IN_UTMP
95 strncpy(u.ut_host, host, sizeof(u.ut_host));
98 /* Figure out the file names. */
103 lastlog = _PATH_LASTLOG;
105 /* Update lastlog unless actually recording a logout. */
106 if (strcmp(user, "") != 0) {
108 * It is safer to bzero the lastlog structure first because
109 * some systems might have some extra fields in it (e.g. SGI)
111 memset(&ll, 0, sizeof(ll));
113 /* Update lastlog. */
114 ll.ll_time = time(NULL);
115 strncpy(ll.ll_line, ttyname + 5, sizeof(ll.ll_line));
116 strncpy(ll.ll_host, host, sizeof(ll.ll_host));
117 fd = open(lastlog, O_RDWR);
119 lseek(fd, (off_t) ((long) uid * sizeof(ll)), SEEK_SET);
120 if (write(fd, &ll, sizeof(ll)) != sizeof(ll))
121 log("Could not write %.100s: %.100s", lastlog, strerror(errno));
127 /* Records that the user has logged out. */
130 record_logout(int pid, const char *ttyname)
132 #ifdef HAVE_LIBUTIL_LOGIN
133 const char *line = ttyname + 5; /* /dev/ttyq8 -> ttyq8 */
135 logwtmp(line, "", "");
136 #else /* HAVE_LIBUTIL_LOGIN */
137 record_login(pid, ttyname, "", -1, "", NULL);
138 #endif /* HAVE_LIBUTIL_LOGIN */