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Pull in patch from current (even more to come):
Fix (millert):
warnx?/errx? paranoia (use "%s" not a bare string unless it is a
constant).  These are not security holes but it is worth fixing
them anyway both for robustness and so folks looking for examples
in the tree are not misled into doing something potentially dangerous.
Furthermore, it is a bad idea to assume that pathnames will not
include '%' in them and that error routines don't return strings
with '%' in them (especially in light of the possibility of locales).

/*	$OpenBSD: script.c,v 1.12.2.1 2000/10/06 21:16:16 jason Exp $	*/
/*	$NetBSD: script.c,v 1.3 1994/12/21 08:55:43 jtc Exp $	*/

/*
 * Copyright (c) 1980, 1992, 1993
 *	The Regents of the University of California.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *	This product includes software developed by the University of
 *	California, Berkeley and its contributors.
 * 4. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#ifndef lint
static char copyright[] =
"@(#) Copyright (c) 1980, 1992, 1993\n\
	The Regents of the University of California.  All rights reserved.\n";
#endif /* not lint */

#ifndef lint
#if 0
static char sccsid[] = "@(#)script.c	8.1 (Berkeley) 6/6/93";
#endif
static char rcsid[] = "$OpenBSD: script.c,v 1.12.2.1 2000/10/06 21:16:16 jason Exp $";
#endif /* not lint */

#include <sys/types.h>
#include <sys/wait.h>
#include <sys/stat.h>
#include <sys/ioctl.h>
#include <sys/time.h>

#include <errno.h>
#include <fcntl.h>
#include <paths.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <termios.h>
#include <tzfile.h>
#include <unistd.h>

#include <util.h>
#include <err.h>

FILE	*fscript;
int	master, slave;
int	child, subchild;
int	outcc;
char	*fname;

struct	termios tt;

__dead	void done __P((int));
	void dooutput __P((void));
	void doshell __P((void));
	void fail __P((void));
	void finish __P((int));
	void scriptflush __P((int));
	void handlesigwinch __P((int));


int
main(argc, argv)
	int argc;
	char *argv[];
{
	register int cc;
	struct termios rtt;
	struct winsize win;
	int aflg, ch;
	char ibuf[BUFSIZ];

	aflg = 0;
	while ((ch = getopt(argc, argv, "a")) != -1)
		switch(ch) {
		case 'a':
			aflg = 1;
			break;
		case '?':
		default:
			(void)fprintf(stderr, "usage: script [-a] [file]\n");
			exit(1);
		}
	argc -= optind;
	argv += optind;

	if (argc > 0)
		fname = argv[0];
	else
		fname = "typescript";

	if ((fscript = fopen(fname, aflg ? "a" : "w")) == NULL)
		err(1, "%s", fname);

	(void)tcgetattr(STDIN_FILENO, &tt);
	(void)ioctl(STDIN_FILENO, TIOCGWINSZ, &win);
	if (openpty(&master, &slave, NULL, &tt, &win) == -1)
		err(1, "openpty");

	(void)printf("Script started, output file is %s\n", fname);
	rtt = tt;
	cfmakeraw(&rtt);
	rtt.c_lflag &= ~ECHO;
	(void)tcsetattr(STDIN_FILENO, TCSAFLUSH, &rtt);

	(void)signal(SIGWINCH, handlesigwinch);
	(void)signal(SIGCHLD, finish);
	child = fork();
	if (child < 0) {
		perror("fork");
		fail();
	}
	if (child == 0) {
		subchild = child = fork();
		if (child < 0) {
			perror("fork");
			fail();
		}
		if (child)
			dooutput();
		else
			doshell();
	}

	(void)fclose(fscript);
	while ((cc = read(STDIN_FILENO, ibuf, BUFSIZ)) > 0)
		(void)write(master, ibuf, cc);
	done(0);
}

void
finish(signo)
	int signo;
{
	register int die, pid;
	int save_errno = errno;
	int status, e;

	die = e = 0;
	while ((pid = wait3(&status, WNOHANG, 0)) > 0)
		if (pid == child) {
			die = 1;
			if (WIFEXITED(status))
                                e = WEXITSTATUS(status);
                        else
                                e = 1;
		}

	if (die)
		done(e);
	errno = save_errno;
}

void
handlesigwinch(signo)
	int signo;
{
	struct winsize win;
	pid_t pgrp;
	int save_errno = errno;

	if (ioctl(STDIN_FILENO, TIOCGWINSZ, &win) != -1) {
	    ioctl(slave, TIOCSWINSZ, &win);
	    if (ioctl(slave, TIOCGPGRP, &pgrp) != -1)
	    	killpg(pgrp, SIGWINCH);
	}
	errno = save_errno;
}

void
dooutput()
{
	struct itimerval value;
	register int cc;
	time_t tvec;
	char obuf[BUFSIZ];

	(void)close(STDIN_FILENO);
	tvec = time(NULL);
	(void)fprintf(fscript, "Script started on %s", ctime(&tvec));

	(void)signal(SIGALRM, scriptflush);
	value.it_interval.tv_sec = SECSPERMIN / 2;
	value.it_interval.tv_usec = 0;
	value.it_value = value.it_interval;
	(void)setitimer(ITIMER_REAL, &value, NULL);
	for (;;) {
		cc = read(master, obuf, sizeof (obuf));
		if (cc <= 0)
			break;
		(void)write(1, obuf, cc);
		(void)fwrite(obuf, 1, cc, fscript);
		outcc += cc;
	}
	done(0);
}

void
scriptflush(signo)
	int signo;
{
	int save_errno = errno;

	if (outcc) {
		(void)fflush(fscript);
		outcc = 0;
	}
	errno = save_errno;
}

void
doshell()
{
	char *shell;

	shell = getenv("SHELL");
	if (shell == NULL)
		shell = _PATH_BSHELL;

	(void)close(master);
	(void)fclose(fscript);
	login_tty(slave);
	execl(shell, shell, "-i", NULL);
	perror(shell);
	fail();
}

void
fail()
{

	(void)kill(0, SIGTERM);
	done(1);
}

void
done(eval)
	int eval;
{
	time_t tvec;

	if (subchild) {
		tvec = time(NULL);
		(void)fprintf(fscript,"\nScript done on %s", ctime(&tvec));
		(void)fclose(fscript);
		(void)close(master);
	} else {
		(void)tcsetattr(STDIN_FILENO, TCSAFLUSH, &tt);
		(void)printf("Script done, output file is %s\n", fname);
	}
	exit(eval);
}