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Path: utzoo!watmath!clyde!bonnie!akgua!whuxlm!harpo!decvax!tektronix!teklds!dap
From: dap@teklds.UUCP (Damon Permezel)
Newsgroups: net.sources
Subject: Lock your terminal for launch.
Message-ID: <1015@teklds.UUCP>
Date: Thu, 12-Sep-85 13:30:32 EDT
Article-I.D.: teklds.1015
Posted: Thu Sep 12 13:30:32 1985
Date-Received: Sat, 14-Sep-85 17:09:22 EDT
Distribution: net
Organization: Tektronix, Beaverton OR
Lines: 68

[eat me]

At Waterloo, we had a nifty programme to keep turkeys from stealing ones
terminal when one wasn't around (ie, gone home for the night, etc).

/*
 * somb - intelligent 'lock'
 *
 * Author:
 *	Damon Anton Permezel
 *	- recreating a programme I once knew and loved
 */

#include <stdio.h>
#include <sys/types.h>
#include <signal.h>
#include <sgtty.h>
#include <pwd.h>

#define BUFSZ	512

struct	sgttyb tty, ntty;
struct passwd *pwd, *getpwuid();
int somb();

main(argc, argv)
char **argv; {
	register int t;
	int uid;

	uid = getuid();
	pwd = getpwuid(uid);

	for (t = 1; t <= NSIG; t++)
		if (t != SIGHUP)
			signal(t, SIG_IGN);

	signal(SIGINT, somb);

	if (gtty(0, &tty))
		exit(1);

	ntty = tty;
	ntty.sg_flags &= ~ECHO;

	stty(0, &ntty);

	for (;;)
		pause();
}

somb() {
	char buf[BUFSZ];

	signal(SIGINT, SIG_IGN);

	printf("Password: ");
	gets(buf);

	if (strcmp(crypt(buf, pwd->pw_passwd), pwd->pw_passwd)) {
		printf("\nGo away.\n");
		signal(SIGINT, somb);
	} else {
		stty(0, &tty);
		putchar('\n');
		exit(0);
	}
}