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
33 /* Returns the time when the user last logged in. Returns 0 if the
34 information is not available. This must be called before record_login.
35 The host the user logged in from will be returned in buf. */
37 /* Returns the time when the user last logged in (or 0 if no previous login
38 is found). The name of the host used last time is returned in buf. */
41 get_last_login_time(uid_t uid, const char *logname,
42 char *buf, unsigned int bufsize)
48 lastlog = _PATH_LASTLOG;
51 fd = open(lastlog, O_RDONLY);
54 lseek(fd, (off_t) ((long) uid * sizeof(ll)), SEEK_SET);
55 if (read(fd, &ll, sizeof(ll)) != sizeof(ll)) {
60 if (bufsize > sizeof(ll.ll_host) + 1)
61 bufsize = sizeof(ll.ll_host) + 1;
62 strncpy(buf, ll.ll_host, bufsize - 1);
67 /* Records that the user has logged in. I these parts of operating systems
68 were more standardized. */
71 record_login(int pid, const char *ttyname, const char *user, uid_t uid,
72 const char *host, struct sockaddr_in * addr)
78 const char *utmp, *wtmp;
80 /* Construct an utmp/wtmp entry. */
81 memset(&u, 0, sizeof(u));
82 strncpy(u.ut_line, ttyname + 5, sizeof(u.ut_line));
83 u.ut_time = time(NULL);
84 strncpy(u.ut_name, user, sizeof(u.ut_name));
85 #ifdef HAVE_HOST_IN_UTMP
86 strncpy(u.ut_host, host, sizeof(u.ut_host));
89 /* Figure out the file names. */
94 lastlog = _PATH_LASTLOG;
96 /* Update lastlog unless actually recording a logout. */
97 if (strcmp(user, "") != 0) {
98 /* It is safer to bzero the lastlog structure first
99 because some systems might have some extra fields in it
101 memset(&ll, 0, sizeof(ll));
103 /* Update lastlog. */
104 ll.ll_time = time(NULL);
105 strncpy(ll.ll_line, ttyname + 5, sizeof(ll.ll_line));
106 strncpy(ll.ll_host, host, sizeof(ll.ll_host));
107 fd = open(lastlog, O_RDWR);
109 lseek(fd, (off_t) ((long) uid * sizeof(ll)), SEEK_SET);
110 if (write(fd, &ll, sizeof(ll)) != sizeof(ll))
111 log("Could not write %.100s: %.100s", lastlog, strerror(errno));
117 /* Records that the user has logged out. */
120 record_logout(int pid, const char *ttyname)
122 #ifdef HAVE_LIBUTIL_LOGIN
123 const char *line = ttyname + 5; /* /dev/ttyq8 -> ttyq8 */
125 logwtmp(line, "", "");
126 #else /* HAVE_LIBUTIL_LOGIN */
127 record_login(pid, ttyname, "", -1, "", NULL);
128 #endif /* HAVE_LIBUTIL_LOGIN */