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Commit	Line	Data
	1	/*
	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	*/
	19
	20	#include "includes.h"
	21	RCSID("$Id$");
	22
	23	#include <utmp.h>
	24	#include "ssh.h"
	25
	26	#ifdef HAVE_UTIL_H
	27	# include <util.h>
	28	#endif
	29	#ifdef HAVE_LASTLOG_H
	30	# include <lastlog.h>
	31	#endif
	32
	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. */
	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
	40	unsigned long
	41	get_last_login_time(uid_t uid, const char *logname,
	42	char *buf, unsigned int bufsize)
	43	{
	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;
	65	}
	66
	67	/* Records that the user has logged in. I these parts of operating systems
	68	were more standardized. */
	69
	70	void
	71	record_login(int pid, const char ttyname, const char user, uid_t uid,
	72	const char host, struct sockaddr_in addr)
	73	{
	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));
	85	#ifdef HAVE_HOST_IN_UTMP
	86	strncpy(u.ut_host, host, sizeof(u.ut_host));
	87	#endif
	88
	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	}
	114	}
	115	}
	116
	117	/* Records that the user has logged out. */
	118
	119	void
	120	record_logout(int pid, const char *ttyname)
	121	{
	122	#ifdef HAVE_LIBUTIL_LOGIN
	123	const char line = ttyname + 5; / /dev/ttyq8 -> ttyq8 */
	124	if (logout(line))
	125	logwtmp(line, "", "");
	126	#else /* HAVE_LIBUTIL_LOGIN */
	127	record_login(pid, ttyname, "", -1, "", NULL);
	128	#endif /* HAVE_LIBUTIL_LOGIN */
	129	}