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/*
*
* login.c
*
* Author: Tatu Ylonen <ylo@cs.hut.fi>
*
* Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
* All rights reserved
*
* Created: Fri Mar 24 14:51:08 1995 ylo
*
* This file performs some of the things login(1) normally does. We cannot
* easily use something like login -p -h host -f user, because there are
* several different logins around, and it is hard to determined what kind of
* login the current system has. Also, we want to be able to execute commands
* on a tty.
*
*/
#include "includes.h"
RCSID("$Id: login.c,v 1.4 1999/11/25 00:54:59 damien Exp $");
#include <utmp.h>
#include "ssh.h"
#ifdef HAVE_UTIL_H
# include <util.h>
#endif
#ifdef HAVE_LASTLOG_H
# include <lastlog.h>
#endif
/*
* Returns the time when the user last logged in. Returns 0 if the
* information is not available. This must be called before record_login.
* The host the user logged in from will be returned in buf.
*/
/*
* Returns the time when the user last logged in (or 0 if no previous login
* is found). The name of the host used last time is returned in buf.
*/
unsigned long
get_last_login_time(uid_t uid, const char *logname,
char *buf, unsigned int bufsize)
{
struct lastlog ll;
char *lastlog;
int fd;
lastlog = _PATH_LASTLOG;
buf[0] = '\0';
fd = open(lastlog, O_RDONLY);
if (fd < 0)
return 0;
lseek(fd, (off_t) ((long) uid * sizeof(ll)), SEEK_SET);
if (read(fd, &ll, sizeof(ll)) != sizeof(ll)) {
close(fd);
return 0;
}
close(fd);
if (bufsize > sizeof(ll.ll_host) + 1)
bufsize = sizeof(ll.ll_host) + 1;
strncpy(buf, ll.ll_host, bufsize - 1);
buf[bufsize - 1] = 0;
return ll.ll_time;
}
/*
* Records that the user has logged in. I these parts of operating systems
* were more standardized.
*/
void
record_login(int pid, const char *ttyname, const char *user, uid_t uid,
const char *host, struct sockaddr_in * addr)
{
int fd;
struct lastlog ll;
char *lastlog;
struct utmp u;
const char *utmp, *wtmp;
/* Construct an utmp/wtmp entry. */
memset(&u, 0, sizeof(u));
strncpy(u.ut_line, ttyname + 5, sizeof(u.ut_line));
u.ut_time = time(NULL);
strncpy(u.ut_name, user, sizeof(u.ut_name));
#ifdef HAVE_HOST_IN_UTMP
strncpy(u.ut_host, host, sizeof(u.ut_host));
#endif
/* Figure out the file names. */
utmp = _PATH_UTMP;
wtmp = _PATH_WTMP;
login(&u);
lastlog = _PATH_LASTLOG;
/* Update lastlog unless actually recording a logout. */
if (strcmp(user, "") != 0) {
/*
* It is safer to bzero the lastlog structure first because
* some systems might have some extra fields in it (e.g. SGI)
*/
memset(&ll, 0, sizeof(ll));
/* Update lastlog. */
ll.ll_time = time(NULL);
strncpy(ll.ll_line, ttyname + 5, sizeof(ll.ll_line));
strncpy(ll.ll_host, host, sizeof(ll.ll_host));
fd = open(lastlog, O_RDWR);
if (fd >= 0) {
lseek(fd, (off_t) ((long) uid * sizeof(ll)), SEEK_SET);
if (write(fd, &ll, sizeof(ll)) != sizeof(ll))
log("Could not write %.100s: %.100s", lastlog, strerror(errno));
close(fd);
}
}
}
/* Records that the user has logged out. */
void
record_logout(int pid, const char *ttyname)
{
#ifdef HAVE_LIBUTIL_LOGIN
const char *line = ttyname + 5; /* /dev/ttyq8 -> ttyq8 */
if (logout(line))
logwtmp(line, "", "");
#else /* HAVE_LIBUTIL_LOGIN */
record_login(pid, ttyname, "", -1, "", NULL);
#endif /* HAVE_LIBUTIL_LOGIN */
}
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