IABSD.fr/src/usr.bin/tty/tty.c

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• Author : cheloha
  Date : 2024-05-06 16:49:46
  Hash : ce405b38
  Message : tty(1): exit with status 2 if unveil(2) or pledge(2) fail tty(1) returns >1 on error, not 1. Thread: https://marc.info/?l=openbsd-tech&m=171494082629111&w=2 ok deraadt@ guenther@

• usr.bin/tty/tty.c

• /*	$OpenBSD: tty.c,v 1.14 2024/05/06 16:49:46 cheloha Exp $	*/
  /*	$NetBSD: tty.c,v 1.4 1994/12/07 00:46:57 jtc Exp $	*/
  
  /*
   * Copyright (c) 1988, 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. 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.
   */
  
  #include <stdio.h>
  #include <stdlib.h>
  #include <unistd.h>
  #include <paths.h>
  #include <err.h>
  
  static void usage(void);
  
  int
  main(int argc, char *argv[])
  {
  	int ch, sflag;
  	char *t;
  
  	sflag = 0;
  	while ((ch = getopt(argc, argv, "s")) != -1) {
  		switch(ch) {
  		case 's':
  			sflag = 1;
  			break;
  		default:
  			usage();
  			/* NOTREACHED */
  		}
  	}
  
  	if (unveil(_PATH_DEVDB, "r") == -1)
  		err(2, "unveil %s", _PATH_DEVDB);
  	if (pledge("stdio rpath", NULL) == -1)
  		err(2, "pledge");
  
  	t = ttyname(STDIN_FILENO);
  	if (!sflag)
  		puts(t ? t : "not a tty");
  	exit(t ? 0 : 1);
  }
  
  static void
  usage(void)
  {
  	fprintf(stderr, "usage: tty [-s]\n");
  	exit(2);
  }