Path: utzoo!attcan!uunet!mcvax!hp4nl!botter!vulet!hans
From: hans@let.vu.nl (Hans Varkevisser)
Newsgroups: comp.sources.d
Subject: autologout
Keywords: autologout BSD 4.3
Message-ID: <557@vulet.let.vu.nl.UUCP>
Date: 18 Jan 89 12:21:55 GMT
Organization: V.U. Letteren, Amsterdam, the Netherlands
Lines: 198


This only is for users of BSD 4.3 with w.c version 5.3

I have made changes to the program w.c and changed the name to
autologout.c.
I use the program autologout to logout users who are idle for a given time
You set the time in the source file.
There are two var for time, max_idle and max_limit. 
max_idle is used to logout a user who is idle for > max_idle and 
who only has the shellproces running (number of processes =1).
max_limit is used to logout a user who is idle for > max_limit and can
have more processes running, only the shellproces is killed.
I use the kill -1, pid because -1 is the hangup signal .
I find this the best way to do, of course you can use other signals.
I use the var min_number to test for uid > given number, this is used by
us to leave staff users logged in.
I put an entry in crontab that start every 5 minutes autologout -k.

Because of the copyright I only have send the diff between w.c and autologout.c.
The next vars I used for the program, see the diff file at the end.


 #define KILL_SIGNAL	"-1"	/* use this for kill, -1 = hangup */

int 	tmp_pid = 0;		/* temporary proces id */
int 	tmp_uid = 0;		/* temporary user id */
int	max_idle = 30;		/* max idle time in minutes */
int	max_limit = 60;		/* max limit time in minutes */
int 	kill_on = 0;		/* true if -k flag, kill idle process */
int 	tot_proc = 0;		/* total of processes */
char	tmp_itoa[10];		/* tmp var to convert int to string */
char	command[512];		/* command string for systemcall */
int	min_number = 100;	/* user number less than min_number


The text is the result of diff -e w.c autologout.c
-------- cut here ------------- cut here ----------------
673a
}
itoa(n,s)
char s[];
int n;
{
	int i, sign;
	
	if ((sign = n) < 0)
		n = -n;
	i = 0;
	do {
		s[i++] = n % 10 + '0';
	} while (( n /= 10 ) > 0 );
	if (sign < 0)
		s[i++] = '-';
	s[i] = '\0';
	reverse(s);
}
reverse (s)
char s[];
{
	int c, i, j;

	for (i = 0, j = strlen(s)-1; i < j; i++, j--) {
		c = s[i];
		s[i] = s[j];
		s[j] = c;
	}
}
kill_shell()
{	
	/* convert int pid to string */
	itoa(tmp_pid,tmp_itoa);		

	/* put command in command string */
	strcpy(command,"kill ");

	/* KILL_SIGNAL can be user defined */
	strcat(command, KILL_SIGNAL);
	strcat(command, " ");

	/* append pid to commandstring */
	strcat(command,tmp_itoa);

/* kill user for idle > 60 minutes  don't look at number of processes*/
	
	if ((tmp_uid > min_number) && ( idle >= max_limit)){
		/* execute a kill -1 on pid */
		system(command);
	
	}
	/* kill user for idle > 30 minutes and only one process running */
	if ((tmp_uid > min_number) && ( idle >= max_idle) && (tot_proc == 1)){
	/* execute a kill -1 on pid */
		system(command);
	}
.
535a
		pr[np].w_pgrp = mproc.p_pgrp;
.
344,374d
342c
	printf("pid %5d\t%-*.*s ",  tmp_pid, NMAX, NMAX, utmp.ut_name); 
		printf("%3d idle \t%-.32s\n", idle,doing );
.
340c
		
.
318a
}
.
317a
	strcpy(tmp_doing, lflag ? pr[i].w_args : pr[i].w_comm);
	if ((doing[0] == '-' || doing[0] == 0) && (tmp_pid == 0))
		tmp_pid=pr[i].w_pid;
	if ((tmp_doing[0] == '-' || tmp_doing[0] == 0) && (tmp_pid == 0))
		tmp_pid=pr[i].w_pid;
	
	}	
	/* -k flag log users out who are idle > 30 minutes */
	if ((kill_on == 1) && ( tmp_pid >= 10)) 
		kill_shell();	
	else 
		putline();
.
304,316c

	if(pr[i].w_pid>curpid && (pr[i].w_igintr!=IGINT || empty)){
		curpid = pr[i].w_pid;
		strcpy(doing, lflag ? pr[i].w_args : pr[i].w_comm);
.
283,297c
			tot_proc++;
	
			tmp_uid=pr[i].w_uid;

			if (debug) {
				printf("\t%5d\t%s",pr[i].w_pid,pr[i].w_args);
.
277a
		tot_proc=0;
		tmp_pid=0;
.
208,260d
201,206d
197,199d
163c
				case 'a':
.
145a
				case 'k':
					kill_on++;
					break;

.
106a
/* new variables for autologout */

#define KILL_SIGNAL	"-1"	/* use this for kill, -1 = hangup */

int 	tmp_pid = 0;		/* temporary proces id */
int 	tmp_uid = 0;		/* temporary user id */
int	max_idle = 30;		/* max idle time in minutes */
int	max_limit = 60;		/* max limit time in minutes */
int 	kill_on = 0;		/* true if -k flag, kill idle process */
int 	tot_proc = 0;		/* total of processes */
char	tmp_itoa[10];		/* tmp var to convert int to string */
char	command[512];		/* command string for systemcall */
int	min_number = 100;	/* user number less than min_number
				 * won't be affected
				*/
char	tmp_doing[520];		/* process attached to terminal */

.
41a
	short	w_pgrp;			/* proc.p_pgrp */
.
17,22d
14c
static char sccsid[] = "@(#)autologout.c	1.0 (Free University) 1/11/89";
.
7,11c
/* This programm is adapted from the programm w.c.
 * There some changes and some features are deleted
 * I add the autologout feature, the programm looks at the
 * idle time and the number of processes. If the idle time is > 30
 * and the number of processes = 1 the the user is logout by kill signal
 * For safety there is a check on the uid, on our computer we only kill
 * the user if the uid > 100.
 * Hans Varkevisser, Fac of Literature Free University the Netherlands
 * let.vu.nl!hans or hans@let.vu.nl   (UUCP)
 */
.
----------- end -----------------

-- 
Organisation:	Free University, Faculty of Literature
                Amsterdam, the Netherlands           
Name:		Hans Varkevisser (system administrator) 
                hans@let.vu.nl  or let.vu.nl!hans     UUCP