slattach.c revision 1.8 
1/*
2 * Copyright (c) 1988 Regents of the University of California.
3 * All rights reserved.
4 *
5 * This code is derived from software contributed to Berkeley by
6 * Rick Adams.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 *    notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 *    notice, this list of conditions and the following disclaimer in the
15 *    documentation and/or other materials provided with the distribution.
16 * 3. All advertising materials mentioning features or use of this software
17 *    must display the following acknowledgement:
18 *	This product includes software developed by the University of
19 *	California, Berkeley and its contributors.
20 * 4. Neither the name of the University nor the names of its contributors
21 *    may be used to endorse or promote products derived from this software
22 *    without specific prior written permission.
23 *
24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
27 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34 * SUCH DAMAGE.
35 */
36
37/*
38** Hacks to support "-a|c|n" flags on the command line which enalbe VJ
39** header compresion and disable ICMP.  I use getopt to deal witht that
40** stuff because I'm a lazy sob, I can't spell, and that's OK.
41**
42** If this is good all rights go to B & L Jolitz, otherwise send your
43** comments to Reagan (/dev/null).
44**
45** nerd@percival.rain.com (Michael Galassi) 92.09.03
46**
47** Hacked to change from sgtty to POSIX termio style serial line control
48** and added flag to enable cts/rts style flow control.
49**
50** blymn@awadi.com.au (Brett Lymn) 93.04.04
51*/
52
53#ifndef lint
54char copyright[] =
55"@(#) Copyright (c) 1988 Regents of the University of California.\n\
56 All rights reserved.\n";
57#endif /* not lint */
58
59#ifndef lint
60/*static char sccsid[] = "from: @(#)slattach.c	4.6 (Berkeley) 6/1/90";*/
61static char rcsid[] = "$Id: slattach.c,v 1.8 1993/12/02 05:44:30 mycroft Exp $";
62#endif /* not lint */
63
64#include <sys/param.h>
65#include <sys/ioctl.h>
66#include <termios.h>
67#include <sys/socket.h>
68#include <netinet/in.h>
69#include <net/if.h>
70#include <net/if_slvar.h>
71#include <netdb.h>
72#include <fcntl.h>
73#include <stdio.h>
74#include <paths.h>
75
76#define DEFAULT_BAUD	9600
77
78static char usage_str[] = "\
79usage: %s [-a] [-c] [-h] [-m] [-n] [-s <speed>] <device>\n\
80	-a -- autoenable VJ compression\n\
81	-c -- enable VJ compression\n\
82	-h -- turn on CTS/RTS style flow control\n\
83	-m -- maintain DTR after last close (no HUPCL)\n\
84	-n -- throw out ICMP packets\n\
85	-s -- baud rate (default 9600)\n";
86
87int main(int argc, char **argv)
88{
89	struct termios tty;
90	int option;
91	int fd;
92	char devname[32];
93	char *dev = (char *)0;
94	int slipdisc = SLIPDISC;
95	int speed = DEFAULT_BAUD;
96	int slflags = 0;
97	int cflags = HUPCL;
98
99	extern char *optarg;
100	extern int optind;
101
102	while ((option = getopt(argc, argv, "achmns:")) != EOF) {
103		switch (option) {
104		case 'a':
105			slflags |= SC_AUTOCOMP;
106			slflags &= ~SC_COMPRESS;
107			break;
108		case 'c':
109			slflags |= SC_COMPRESS;
110			slflags &= ~SC_AUTOCOMP;
111			break;
112		case 'h':
113			cflags |= CRTSCTS;
114			break;
115		case 'm':
116			cflags &= ~HUPCL;
117			break;
118		case 'n':
119			slflags |= SC_NOICMP;
120			break;
121		case 's':
122			speed = atoi(optarg);
123			break;
124		case '?':
125		default:
126			fprintf(stderr, usage_str, argv[0]);
127			exit(1);
128		}
129	}
130
131	if (optind == argc - 1)
132		dev = argv[optind];
133
134
135	if (dev == (char *)0) {
136		fprintf(stderr, usage_str, argv[0]);
137		exit(2);
138	}
139
140	if (strncmp(_PATH_DEV, dev, sizeof(_PATH_DEV) - 1)) {
141		strcpy(devname, _PATH_DEV);
142		strcat(devname, "/");
143		strncat(devname, dev, 10);
144		dev = devname;
145	}
146
147	if ((fd = open(dev, O_RDWR | O_NDELAY)) < 0) {
148		perror(dev);
149		exit(1);
150	}
151
152	if (tcgetattr(fd, &tty) < 0) {
153		perror("tcgetattr");
154		close(fd);
155		exit(1);
156	}
157	tty.c_iflag = 0;
158	tty.c_oflag = 0;
159	tty.c_cflag = CREAD | CS8 | cflags;
160	tty.c_lflag = 0;
161	tty.c_cc[VMIN] = 1; /* wait for one char */
162	tty.c_cc[VTIME] = 0; /* wait forever for a char */
163	cfsetispeed(&tty, speed);
164	cfsetospeed(&tty, speed);
165	if (tcsetattr(fd, TCSADRAIN, &tty) < 0) {
166		perror("tcsetattr");
167		close(fd);
168		exit(1);
169	}
170
171	if (ioctl(fd, TIOCSDTR) < 0) {
172                perror("ioctl(TIOCSDTR)");
173                close(fd);
174                exit(1);
175        }
176
177	if (ioctl(fd, TIOCSETD, &slipdisc) < 0) {
178		perror("ioctl(TIOCSETD)");
179		close(fd);
180		exit(1);
181	}
182
183	if (ioctl(fd, SLIOCSFLAGS, &slflags) < 0) {
184		perror("ioctl(SLIOCSFLAGS)");
185		close(fd);
186		exit(1);
187	}
188
189	if (fork() > 0)
190		exit(0);
191
192	for (;;)
193		sigpause(0L);
194}
195