[openssh.git] / login.c

/*
 * 
 * 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("$Id$");

#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 */
}
Commit	Line	Data
8efc0c15	1	/*
5260325f	2	*
	3	* login.c
	4	*
	5	* Author: Tatu Ylonen <ylo@cs.hut.fi>
	6	*
	7	* Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
	8	* All rights reserved
	9	*
	10	* Created: Fri Mar 24 14:51:08 1995 ylo
	11	*
	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
	16	* on a tty.
	17	*
	18	*/
8efc0c15	19
	20	#include "includes.h"
	21	RCSID("$Id$");
	22
	23	#include <utmp.h>
5260325f	24	#include "ssh.h"
4cca272e	25
5260325f	26	#ifdef HAVE_UTIL_H
	27	# include <util.h>
	28	#endif
4cca272e	29	#ifdef HAVE_LASTLOG_H
	30	# include <lastlog.h>
	31	#endif
	32
5260325f	33	/* Returns the time when the user last logged in. Returns 0 if the
5260325f	34	information is not available. This must be called before record_login.
8efc0c15	35	The host the user logged in from will be returned in buf. */
	36
	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. */
	39
5260325f	40	unsigned long
	41	get_last_login_time(uid_t uid, const char *logname,
	42	char *buf, unsigned int bufsize)
8efc0c15	43	{
5260325f	44	struct lastlog ll;
	45	char *lastlog;
	46	int fd;
	47
	48	lastlog = _PATH_LASTLOG;
	49	buf[0] = '\0';
	50
	51	fd = open(lastlog, O_RDONLY);
	52	if (fd < 0)
	53	return 0;
	54	lseek(fd, (off_t) ((long) uid * sizeof(ll)), SEEK_SET);
	55	if (read(fd, &ll, sizeof(ll)) != sizeof(ll)) {
	56	close(fd);
	57	return 0;
	58	}
	59	close(fd);
	60	if (bufsize > sizeof(ll.ll_host) + 1)
	61	bufsize = sizeof(ll.ll_host) + 1;
	62	strncpy(buf, ll.ll_host, bufsize - 1);
	63	buf[bufsize - 1] = 0;
	64	return ll.ll_time;
8efc0c15	65	}
	66
	67	/* Records that the user has logged in. I these parts of operating systems
	68	were more standardized. */
	69
5260325f	70	void
	71	record_login(int pid, const char ttyname, const char user, uid_t uid,
	72	const char host, struct sockaddr_in addr)
8efc0c15	73	{
5260325f	74	int fd;
	75	struct lastlog ll;
	76	char *lastlog;
	77	struct utmp u;
	78	const char utmp, wtmp;
	79
	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));
4cca272e	85	#ifdef HAVE_HOST_IN_UTMP
5260325f	86	strncpy(u.ut_host, host, sizeof(u.ut_host));
4cca272e	87	#endif
8efc0c15	88
5260325f	89	/* Figure out the file names. */
	90	utmp = _PATH_UTMP;
	91	wtmp = _PATH_WTMP;
	92
	93	login(&u);
	94	lastlog = _PATH_LASTLOG;
	95
	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
	100	(e.g. SGI) */
	101	memset(&ll, 0, sizeof(ll));
	102
	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);
	108	if (fd >= 0) {
	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));
	112	close(fd);
	113	}
8efc0c15	114	}
8efc0c15	115	}
5260325f	116
	117	/* Records that the user has logged out. */
	118
	119	void
	120	record_logout(int pid, const char *ttyname)
8efc0c15	121	{
4cca272e	122	#ifdef HAVE_LIBUTIL_LOGIN
5260325f	123	const char line = ttyname + 5; / /dev/ttyq8 -> ttyq8 */
	124	if (logout(line))
	125	logwtmp(line, "", "");
4cca272e	126	#else /* HAVE_LIBUTIL_LOGIN */
5260325f	127	record_login(pid, ttyname, "", -1, "", NULL);
4cca272e	128	#endif /* HAVE_LIBUTIL_LOGIN */
8efc0c15	129	}