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      1 /*	$NetBSD: slattach.c,v 1.33 2013/10/20 20:17:52 mbalmer Exp $	*/
      2 
      3 /*
      4  * Copyright (c) 1988, 1993
      5  *	The Regents of the University of California.  All rights reserved.
      6  *
      7  * This code is derived from software contributed to Berkeley by
      8  * Rick Adams.
      9  *
     10  * Redistribution and use in source and binary forms, with or without
     11  * modification, are permitted provided that the following conditions
     12  * are met:
     13  * 1. Redistributions of source code must retain the above copyright
     14  *    notice, this list of conditions and the following disclaimer.
     15  * 2. Redistributions in binary form must reproduce the above copyright
     16  *    notice, this list of conditions and the following disclaimer in the
     17  *    documentation and/or other materials provided with the distribution.
     18  * 3. Neither the name of the University nor the names of its contributors
     19  *    may be used to endorse or promote products derived from this software
     20  *    without specific prior written permission.
     21  *
     22  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     23  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     24  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     25  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     26  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     27  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     28  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     29  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     30  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     31  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     32  * SUCH DAMAGE.
     33  */
     34 
     35 #include <sys/cdefs.h>
     36 #ifndef lint
     37 __COPYRIGHT("@(#) Copyright (c) 1988, 1993\
     38  The Regents of the University of California.  All rights reserved.");
     39 #endif /* not lint */
     40 
     41 #ifndef lint
     42 #if 0
     43 static char sccsid[] = "@(#)slattach.c	8.2 (Berkeley) 1/7/94";
     44 #else
     45 __RCSID("$NetBSD: slattach.c,v 1.33 2013/10/20 20:17:52 mbalmer Exp $");
     46 #endif
     47 #endif /* not lint */
     48 
     49 #include <sys/param.h>
     50 #include <sys/socket.h>
     51 #include <sys/types.h>
     52 #include <sys/ioctl.h>
     53 
     54 #include <net/if.h>
     55 #include <netinet/in.h>
     56 
     57 #include <err.h>
     58 #include <errno.h>
     59 #include <fcntl.h>
     60 #include <netdb.h>
     61 #include <paths.h>
     62 #include <signal.h>
     63 #include <stdio.h>
     64 #include <stdlib.h>
     65 #include <string.h>
     66 #include <termios.h>
     67 #include <unistd.h>
     68 
     69 static int	speed = 9600;
     70 static const char	*ldisc = "slip";
     71 
     72 static char	devicename[32];
     73 
     74 __dead static void	usage(void);
     75 
     76 int
     77 main(int argc, char *argv[])
     78 {
     79 	int fd;
     80 	char *dev = argv[1];
     81 	struct termios tty;
     82 	tcflag_t cflag = HUPCL;
     83 	int ch;
     84 	sigset_t nsigset;
     85 	int opt_detach = 1;
     86 
     87 	while ((ch = getopt(argc, argv, "hHlmns:t:")) != -1) {
     88 		switch (ch) {
     89 		case 'h':
     90 			cflag |= CRTSCTS;
     91 			break;
     92 		case 'H':
     93 			cflag |= CDTRCTS;
     94 			break;
     95 		case 'l':
     96 			cflag |= CLOCAL;
     97 			break;
     98 		case 'm':
     99 			cflag &= ~HUPCL;
    100 			break;
    101 		case 'n':
    102 			opt_detach = 0;
    103 			break;
    104 		case 's':
    105 			speed = atoi(optarg);
    106 			break;
    107 		case 't':
    108 			ldisc = optarg;
    109 			break;
    110 		case '?':
    111 		default:
    112 			usage();
    113 		}
    114 	}
    115 	argc -= optind;
    116 	argv += optind;
    117 
    118 	if (argc != 1)
    119 		usage();
    120 
    121 	dev = *argv;
    122 	if (strncmp(_PATH_DEV, dev, sizeof(_PATH_DEV) - 1)) {
    123 		(void)snprintf(devicename, sizeof(devicename),
    124 		    "%s%s", _PATH_DEV, dev);
    125 		dev = devicename;
    126 	}
    127 	if ((fd = open(dev, O_RDWR | O_NDELAY)) < 0)
    128 		err(1, "%s", dev);
    129 	tty.c_cflag = CREAD | CS8 | cflag;
    130 	tty.c_iflag = 0;
    131 	tty.c_lflag = 0;
    132 	tty.c_oflag = 0;
    133 	tty.c_cc[VMIN] = 1;
    134 	tty.c_cc[VTIME] = 0;
    135 	cfsetspeed(&tty, speed);
    136 	if (tcsetattr(fd, TCSADRAIN, &tty) < 0)
    137 		err(1, "tcsetattr");
    138 	if (ioctl(fd, TIOCSDTR, 0) < 0 && errno != ENOTTY)
    139 		err(1, "TIOCSDTR");
    140 	if (ioctl(fd, TIOCSLINED, ldisc) < 0)
    141 		err(1, "TIOCSLINED");
    142 	if (opt_detach && daemon(0, 0) != 0)
    143 		err(1, "couldn't detach");
    144 	sigemptyset(&nsigset);
    145 	for (;;)
    146 		sigsuspend(&nsigset);
    147 }
    148 
    149 static void
    150 usage(void)
    151 {
    152 
    153 	(void)fprintf(stderr,
    154 	    "usage: %s [-t ldisc] [-hHlmn] [-s baudrate] ttyname\n",
    155 		getprogname());
    156 	exit(1);
    157 }
    158